WO2015096103A1 - Base station, terminal, resource allocation method and system - Google Patents

Abstract

Provided are a base station, a terminal, and a resource allocation method and system, relating to the field of wireless communications. The base station comprises: a request reception module, a resource determination module, a first resource allocation module, a first resource sending module and a second resource sending module. After receiving a request to establish an end to end (D2D) communication with a second terminal which is sent by a first terminal, by way of determining resources which may be multiplexed by the first terminal and the second terminal and allocating target resources from multiplex resources, the present invention solves the problem in the prior art that the situation of no idle D2D resources for allocation may arise when there are many terminals requesting to establish a D2D communication within a coverage area of the base station, and achieves the purpose of improving the resource utilization rate and system capacity.

Description

 Description base station, terminal, resource allocation method and system

 The present invention relates to the field of wireless communications, and in particular, to a base station, a terminal, a resource allocation method, and a system. Background technique

 Device-to-Device (D2D, end-to-end) communication is a technology that allows direct communication between terminals under system control. In D2D communication, in order to avoid interference between individual terminals, the base station needs to allocate respective D2D resources for each D2D terminal.

 In the existing D2D resource allocation method, the base station pre-partitions a part of communication resources as D2D resources; when the first terminal discovers the second terminal that can perform D2D communication, sends a request for establishing D2D communication with the second terminal to the base station; After the request, it is detected whether there is an idle resource in the D2D resource, and if yes, part or all of the idle resource is allocated as a resource that the first terminal sends a D2D communication signal to the second terminal.

 In the process of implementing the present invention, the inventors have found that the prior art has at least the following problems: The resources available for D2D communication are limited. When there are a large number of terminals performing D2D communication within the coverage of the base station, there may be no idle D2D resources. In the case of a terminal allocated for newly requesting D2D communication, resource utilization is not high and system capacity is low. Summary of the invention

 In order to solve the problem in the prior art, when there are a large number of terminals performing D2D communication in the coverage of the base station, there may be a problem that no idle D2D resources are available for allocation to a terminal that newly requests to establish D2D communication, and an embodiment of the present invention provides a Base station, terminal, resource allocation method and system. The technical solution is as follows:

 In a first aspect, a base station is provided, where the base station includes:

 a request receiving module, configured to receive a request sent by the first terminal to establish end-to-end D2D communication with the second terminal;

a resource determining module, configured to determine, in the already allocated D2D resource, the first terminal a reusable resource multiplexed with the second terminal;

 a first resource allocation module, configured to allocate a target resource from the reusable resource;

 a first resource sending module, configured to send the target resource to the first terminal, where the first terminal sends a D2D communication signal according to the target resource;

 And a second resource sending module, configured to send the target resource to the second terminal, where the second terminal receives the D2D communication signal according to the target resource.

 In a first possible implementation manner of the first aspect, the resource determining module includes: a first instruction sending unit, configured to send a first instruction to the third terminal, where the first instruction is used to indicate the third The terminal monitors the discovery signal sent by the first terminal;

 a first response receiving unit, configured to receive a first response returned by the third terminal, where the first response is applied to indicate whether a signal quality of the discovery signal monitored by the third terminal is less than a predetermined quality threshold;

 a second instruction sending unit, configured to send, to the second terminal, the first resource, if the first response indicates that the signal quality of the discovery signal monitored by the third terminal is less than the predetermined quality threshold The second command, the first resource is a D2D resource that is allocated to the third terminal to receive the D2D communication signal, and the second instruction is used to instruct the second terminal to monitor the D2D according to the first resource. Communication signal

 a second response receiving unit, configured to receive a second response returned by the second terminal, where the second response is used to indicate whether a signal strength of the D2D communication signal that is monitored by the second terminal according to the first resource is less than Predetermined intensity threshold;

 a first determining unit, configured to: if the received second response indicates that the signal strength of the D2D communication signal that is monitored by the second terminal according to the first resource is less than the predetermined intensity threshold, The resource is determined to be the reusable resource.

 With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the first response receiving unit, configured to receive, by the third terminal, the first response a first response frame, where the first response frame is a first D2D communication frame sent by the third terminal according to the first resource after receiving the first instruction.

In a third possible implementation manner of the first aspect, the resource determining module includes: a third instruction sending unit, configured to send, to the second terminal, a third instruction that includes a second resource, where the second The resource is a D2D resource that has been allocated to the fourth terminal to receive the D2D communication signal; the third instruction is used to instruct the second terminal to monitor the D2D communication signal according to the second resource; a third response receiving unit, configured to receive a third response returned by the second terminal, where the third response is used to indicate whether a signal strength of the D2D communication signal that is monitored by the second terminal according to the second resource is less than Predetermined intensity threshold;

 a fourth instruction sending unit, configured to send, to the fourth terminal, if the third response indicates that the signal strength of the D2D communication signal monitored by the second terminal according to the second resource is less than the predetermined intensity threshold a fourth instruction, where the fourth instruction is used to instruct the fourth terminal to listen to the discovery signal sent by the first terminal;

 a fourth response receiving unit, configured to receive a fourth response returned by the fourth terminal, where the fourth ring is applied to indicate whether a signal quality of the discovery signal monitored by the fourth terminal is less than a predetermined quality threshold;

 a second determining unit, configured to determine, according to the fourth response that the received fourth signal indicates that the signal quality of the discovery signal monitored by the fourth terminal is less than the predetermined quality threshold, Reusable resources.

 With reference to the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the fourth response receiving unit, configured to receive, by the fourth terminal, the fourth response a second response frame, where the second response frame is a first D2D communication frame sent by the fourth terminal according to the second resource after receiving the fourth instruction.

 With reference to the first aspect, the first possible implementation manner of the first aspect, the second possible implementation manner of the first aspect, the third possible implementation manner of the first aspect, or the fourth possible implementation manner of the first aspect, In a fifth possible implementation manner of the foregoing aspect, the base station further includes:

 a first detecting module, configured to detect whether the target resource is sufficient after the target resource is allocated from the reusable resource;

 a second detecting module, configured to detect whether there is an idle D2D resource if the detection result of the first detecting module is that the target resource is insufficient;

 And a second resource allocation module, configured to allocate the target resource from the idle D2D resource if the detection result of the second detection module is that there is an idle D2D resource.

 With reference to the first aspect, the first possible implementation manner of the first aspect, the second possible implementation manner of the first aspect, the third possible implementation manner of the first aspect, or the fourth possible implementation manner of the first aspect, In a sixth possible implementation manner of the foregoing aspect, the base station further includes:

a third detecting module, configured to detect whether there is an idle D2D resource before the first resource allocation module allocates the target resource from the reusable resource; a third resource allocation module, configured to: if the detection result of the third detection module is idle

a D2D resource, the target resource is allocated from the idle D2D resource;

 a fourth detecting module, configured to detect whether the target resource is sufficient after the target resource is allocated from the idle D2D resource;

 And the first resource allocation module is configured to perform the step of allocating the target resource from the reusable resource if the detection result of the fourth detecting module is that the target resource is insufficient.

 In a second aspect, a base station is provided, where the base station includes: a receiver, a processor, and a transmitter, where the receiver is configured to receive, by the first terminal, an end-to-end D2D communication with the second terminal. Request

 The processor, configured to determine, in the already allocated D2D resources, a reusable resource that can be multiplexed by the first terminal and the second terminal;

 The processor, configured to allocate a target resource from the reusable resource;

 The processor is configured to control the transmitter to send the target resource to the first terminal and the second terminal, where the first terminal sends a D2D communication signal according to the target resource, and The second terminal receives the D2D communication signal according to the target resource.

 In a first possible implementation manner of the second aspect, the processor is configured to control the transmitter to send a first instruction to a third terminal, where the first instruction is used to instruct the third terminal to monitor the a discovery signal sent by the first terminal;

 The receiver is configured to receive a first response returned by the third terminal, where the first response is used to indicate whether a signal quality of the discovery signal monitored by the third terminal is less than a predetermined quality threshold; a processor, configured to: if the first response indicates that a signal quality of the discovery signal monitored by the third terminal is less than the predetermined quality threshold, control the transmitter to send the second terminal to include a second instruction of a resource, the first resource is allocated to the third terminal for receiving

a D2D resource of the D2D communication signal, the second instruction is used to instruct the second terminal to monitor the D2D communication signal according to the first resource;

 The receiver is configured to receive a second response returned by the second terminal, where the second response is used to indicate whether a signal strength of the D2D communication signal that is monitored by the second terminal according to the first resource is less than a predetermined Intensity threshold

The processor, configured to: if the second response received by the receiver indicates that a signal strength of the D2D communication signal that the second terminal monitors according to the first resource is less than the predetermined intensity threshold, The first resource is determined to be the reusable resource. With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the receiver is configured to receive, by the third terminal, the first that includes the first response The first response frame is a first D2D communication frame sent by the third terminal according to the first resource after receiving the first instruction.

 In a third possible implementation manner of the second aspect, the processor is configured to control the transmitter to send, to the second terminal, a third instruction that includes a second resource, where the second resource is allocated The fourth terminal is configured to receive the D2D resource of the D2D communication signal; the third instruction is used to instruct the second terminal to monitor the D2D communication signal according to the second resource;

 The receiver is configured to receive a third response returned by the second terminal, where the third response is used to indicate whether a signal strength of the D2D communication signal that is monitored by the second terminal according to the second resource is less than a predetermined Intensity threshold

 The processor, if the third response indicates that the signal strength of the D2D communication signal monitored by the second terminal according to the second resource is less than the predetermined intensity threshold, controlling the transmitter to the The fourth terminal sends a fourth instruction, where the fourth instruction is used to instruct the fourth terminal to listen to the discovery signal sent by the first terminal;

 The receiver is configured to receive a fourth response returned by the fourth terminal, where the fourth response is used to indicate whether a signal quality of the discovery signal monitored by the fourth terminal is less than a predetermined quality threshold; a processor, configured to determine, according to the fourth response received by the receiver, that a signal quality of the discovery signal monitored by the fourth terminal is less than the predetermined quality threshold, determine the second resource as The reusable resource.

 With reference to the third possible implementation of the second aspect, in a fourth possible implementation manner of the second aspect, the receiver is configured to receive, by the fourth terminal, a part that includes the fourth response a second response frame, where the second response frame is a first D2D communication frame sent by the fourth terminal according to the second resource after receiving the fourth instruction.

 With reference to the second aspect, the first possible implementation manner of the second aspect, the second possible implementation manner of the second aspect, the third possible implementation manner of the second aspect, or the fourth possible implementation manner of the second aspect, In a fifth possible implementation manner of the second aspect, the processor is further configured to detect whether the target resource is sufficient after the target resource is allocated from the reusable resource;

 The processor is configured to detect whether there is an idle D2D resource if the detection result is that the target resource is insufficient;

The processor is configured to: if the detection result is that there is an idle D2D resource, the idle The target resource is allocated in the D2D resource.

 With reference to the second aspect, the first possible implementation manner of the second aspect, the second possible implementation manner of the second aspect, the third possible implementation manner of the second aspect, or the fourth possible implementation manner of the second aspect, In a sixth possible implementation manner of the second aspect, the processor is configured to detect whether there is an idle D2D resource before allocating the target resource from the reusable resource;

 The processor is configured to allocate the target resource from the idle D2D resource if the detection result is that there is an idle D2D resource;

 The processor is configured to detect whether the target resource is sufficient after the target resource is allocated from the idle D2D resource;

 And the processor is configured to perform the step of allocating the target resource from the reusable resource if the detection result is that the target resource is insufficient.

 In a third aspect, a first terminal is provided, where the first terminal includes:

 a request sending module, configured to send, to the base station, a request for establishing end-to-end D2D communication with the second terminal, where the request is used to indicate that the base station determines, in the already allocated D2D resource, that the first terminal and the Decoding a reusable resource multiplexed by the second terminal, and allocating the target resource from the reusable resource;

 a first resource receiving module, configured to receive a target resource sent by the base station;

 And a communication signal sending module, configured to send a D2D communication signal to the second terminal according to the target resource.

 In a first possible implementation manner of the third aspect, the first terminal further includes:

 The discovery signal sending module is configured to periodically send the discovery signal.

 In a fourth aspect, a first terminal is provided, where the first terminal includes: a processor, a transmitter, and a receiver;

 The processor is configured to control, by the transmitter, a request for establishing an end-to-end D2D communication with a second terminal, where the request is used to indicate that the base station determines that the D2D resource that has been allocated can be Decoding a reusable resource multiplexed by the first terminal and the second terminal, and allocating a target resource from the reusable resource;

 The receiver is configured to receive a target resource sent by the base station;

 The processor is configured to control the transmitter to send a D2D communication signal to the second terminal according to the target resource.

In a first possible implementation manner of the fourth aspect, the processor is further configured to control the transmitting The machine periodically sends a discovery signal.

 In a fifth aspect, a second terminal is provided, where the second terminal includes:

 a second resource receiving module, configured to receive a target resource that is sent by the base station, where the target resource is after the base station receives the request sent by the first terminal to establish end-to-end D2D communication with the second terminal, Determining, among the allocated D2D resources, reusable resources multiplexable by the first terminal and the second terminal, and resources allocated from the reusable resources;

 And a communication signal receiving module, configured to receive, according to the target resource, a D2D communication signal sent by the first terminal.

 In a first possible implementation manner of the fifth aspect, the second terminal further includes:

 a second instruction receiving module, configured to receive, after the second resource receiving module receives the target resource sent by the base station, a second instruction that is sent by the base station and includes the first resource, where the first resource is allocated to the first The D2D resource used by the three terminals to receive the D2D communication signal;

 a first monitoring module, configured to monitor a D2D communication signal according to the first resource;

 a fifth detecting module, configured to detect a signal strength of the D2D communication signal that is monitored according to the first resource, to obtain a first detection result;

 a second response sending module, configured to send a second response to the base station according to the first detection result, where the second response is used to indicate whether a signal strength of the D2D communication signal that is monitored according to the first resource is less than a predetermined Intensity threshold.

 In a second possible implementation manner of the fifth aspect, the second terminal further includes:

 a third instruction receiving module, configured to receive, after the second resource receiving module receives the target resource sent by the base station, a third instruction that is sent by the base station and includes a second resource, where the second resource is allocated to the first Four terminals are used to receive resources of the D2D communication signal;

 a second monitoring module, configured to monitor a D2D communication signal according to the second resource;

 a sixth detecting module, configured to detect a signal strength of the D2D communication signal that is monitored according to the second resource, to obtain a second detection result;

 a third response sending module, configured to send a third response to the base station according to the second detection result, where the third response is used to indicate whether a signal strength of the D2D communication signal that is monitored according to the second resource is less than a predetermined Intensity threshold.

In a sixth aspect, a second terminal is provided, where the second terminal includes: a receiver and a processor; the receiver is configured to receive a target resource that is sent by the base station, and the target resource is that the base station receives the first terminal After transmitting a request for establishing end-to-end D2D communication with the second terminal, Determining, among the allocated D2D resources, reusable resources multiplexable by the first terminal and the second terminal, and resources allocated from the reusable resources;

 The processor is configured to control the receiver to receive a D2D communication signal sent by the first terminal according to the target resource.

 In a first possible implementation manner of the sixth aspect, the second terminal further includes: a transmitter, where the receiver is further configured to: before receiving the target resource sent by the base station, receive the a second instruction of a resource, the first resource is allocated to a third terminal for receiving

D2D resources of D2D communication signals;

 The processor is configured to control the receiver to monitor a D2D communication signal according to the first resource, where the processor is configured to detect a signal strength of a D2D communication signal that is monitored according to the first resource, to obtain a first Test results;

 The processor is configured to control the transmitter to send a second response to the base station according to the first detection result, where the second response is used to indicate a signal of a D2D communication signal that is monitored according to the first resource. Whether the intensity is less than a predetermined intensity threshold.

 In a second possible implementation manner of the sixth aspect, the second terminal further includes: a transmitter, configured to: before receiving the target resource sent by the base station, receiving, by the base station, the second a third instruction of the resource, where the second resource is a resource that has been allocated to the fourth terminal to receive the D2D communication signal;

 The processor is configured to control the receiver to monitor a D2D communication signal according to the second resource, where the processor is configured to detect a signal strength of a D2D communication signal that is monitored according to the second resource, to obtain a second Test results;

 The processor is configured to control the transmitter to send a third response to the base station according to the second detection result, where the third response is used to indicate a signal of a D2D communication signal that is monitored according to the second resource. Whether the intensity is less than a predetermined intensity threshold.

 In a seventh aspect, a third terminal is provided, where the third terminal includes:

 a first instruction receiving module, configured to receive a first instruction sent by the base station, where the first instruction is an instruction sent by the base station after receiving a request for establishing a D2D communication with the second terminal sent by the first terminal;

 a third monitoring module, configured to monitor a discovery signal sent by the first terminal;

a seventh detecting module, configured to detect a signal quality of the discovery signal that is monitored by the third monitoring module, to obtain a third detection result; a first response sending module, configured to send, according to the third detection result, a first response to the base station; when the signal quality of the discovery signal that the base station indicates that the first discovery response is less than a predetermined quality threshold Transmitting, to the second terminal, a second instruction including a first resource, and receiving a second response returned by the second terminal, and indicating, in the second response, the second terminal according to the first resource When the signal strength of the monitored D2D communication signal is less than a predetermined intensity threshold, determining the first resource as a reusable resource, allocating a target resource from the reusable resource, and transmitting the target resource to the The first terminal and the second terminal, the first terminal sends a D2D communication signal according to the target resource, and the second terminal receives the D2D communication signal according to the target resource; wherein, the first resource a D2D resource that has been allocated to the third terminal for receiving a D2D communication signal, where the second instruction is used to instruct the second terminal to monitor a D2D communication signal according to the first resource. For the second response indicating whether the signal strength of the second terminal monitors according to the first resource D2D communication signal strength is smaller than the predetermined threshold value.

 In a first possible implementation manner of the seventh aspect, the first response sending module is configured to send, to the base station, a first response frame that includes the first response, where the first response frame is received After the first instruction, the first D2D communication frame sent according to the first resource.

 In an eighth aspect, a third terminal is provided, where the third terminal includes: a receiver, a processor, and a transmitter;

 The receiver is configured to receive a first instruction sent by the base station, where the first instruction is an instruction that is sent by the base station after receiving a request for establishing a D2D communication with the second terminal by the first terminal; a processor, configured to control the receiver to monitor a discovery signal sent by the first terminal, where the processor is configured to detect a signal quality of the monitored discovery signal, and obtain a third detection result;

The processor is configured to control the transmitter to send a first response to the base station according to the third detection result; and the signal quality of the discovery signal that is monitored by the base station in the first response indication is less than When the quality threshold is predetermined, sending a second instruction including the first resource to the second terminal, and receiving a second response returned by the second terminal, and indicating, in the second response, the second terminal according to the When the signal strength of the D2D communication signal monitored by the first resource is less than a predetermined intensity threshold, determining the first resource as a reusable resource, allocating a target resource from the reusable resource, and using the target resource Sending to the first terminal and the second terminal, the first terminal sends a D2D communication signal according to the target resource, and the second terminal receives the D2D communication signal according to the target resource; The first resource is a D2D resource that has been allocated to the third terminal for receiving a D2D communication signal, and the second instruction is used to instruct the second terminal to monitor a D2D communication signal according to the first resource; The second response is used to indicate whether the signal strength of the D2D communication signal monitored by the second terminal according to the first resource is less than the predetermined intensity threshold.

 In a first possible implementation manner of the eighth aspect, the processor is configured to control the transmitter to send, to the base station, a first response frame that includes the first response, where the first response frame is After receiving the first instruction, according to the first D2D communication frame sent by the first resource.

 In a ninth aspect, a fourth terminal is provided, where the fourth terminal includes:

 a fourth instruction receiving module, configured to receive a fourth command sent by the base station, where the fourth command is a request that the base station sends, by the first terminal, a D2D communication with the second terminal, to the second Transmitting, by the terminal, a third instruction including the second resource, receiving a third response returned by the second terminal, and indicating, in the third response, the D2D communication signal that the second terminal monitors according to the second resource The command sent when the signal strength is less than the predetermined strength threshold; the second resource is a resource that has been allocated to the fourth terminal to receive the D2D communication signal, and the third instruction is used to indicate that the second terminal is configured according to the The second resource is configured to monitor the D2D communication signal, where the third response is used to indicate whether the signal strength of the D2D communication signal monitored by the second terminal according to the second resource is less than the predetermined intensity threshold;

 a fourth monitoring module, configured to monitor a discovery signal sent by the first terminal;

 An eighth detecting module, configured to detect a signal quality of the detected discovery signal, and obtain a fourth detection result;

 a fourth response sending module, configured to send a fourth response to the base station according to the fourth detection result; the fourth response is used to indicate whether the signal quality of the monitored discovery signal is less than a predetermined quality threshold; Determining, by the base station, that the signal quality of the discovery signal that is monitored by the fourth response is less than the predetermined quality threshold, determining, by the second resource, a reusable resource, and allocating a target from the reusable resource And transmitting the target resource to the first terminal and the second terminal, where the first terminal sends a D2D communication signal according to the target resource, and the second terminal is configured according to the target resource. Receive D2D communication signals.

 In a first possible implementation manner of the ninth aspect, the fourth response sending module is configured to send, to the base station, a second response frame that includes the fourth response, where the second response frame is After receiving the fourth instruction, the first D2D communication frame sent according to the second resource.

In a tenth aspect, a fourth terminal is provided, where the fourth terminal includes: a receiver, a processor, and a transmitting Machine

 The receiver is configured to receive a fourth command sent by the base station, where the fourth command is that the base station receives a request for establishing a D2D communication with the second terminal, where the base station sends, to the second terminal Transmitting a third instruction including the second resource, receiving a third response returned by the second terminal, and indicating, in the third response, a signal of the D2D communication signal that the second terminal monitors according to the second resource An instruction sent when the strength is less than a predetermined strength threshold; the second resource is a resource that is allocated to the fourth terminal to receive a D2D communication signal, and the third instruction is used to indicate that the second terminal is configured according to the The second resource is used to monitor the D2D communication signal, and the third response is used to indicate whether the signal strength of the D2D communication signal monitored by the second terminal according to the second resource is less than the predetermined intensity threshold;

 The processor is configured to control the receiver to monitor a discovery signal sent by the first terminal, where the processor is configured to detect a signal quality of the detected discovery signal, and obtain a fourth detection result;

 The processor is configured to control the transmitter to send a fourth response to the base station according to the fourth detection result, where the fourth response is used to indicate whether the signal quality of the monitored discovery signal is less than a predetermined quality. Threshold; determining, by the base station, that the signal quality of the discovery signal that is monitored by the fourth response is less than the predetermined quality threshold, determining the second resource as a reusable resource, from the reusable Allocating a target resource in the resource, and sending the target resource to the first terminal and the second terminal, where the first terminal sends a D2D communication signal according to the target resource, and is configured by the second terminal according to the second terminal The target resource receives a D2D communication signal.

 In a first possible implementation manner of the tenth aspect, the processor is configured to control the transmitter to send, to the base station, a second response frame that includes the fourth response, where the second response frame is And the first D2D communication frame sent according to the second resource after receiving the fourth instruction.

 In an eleventh aspect, a resource allocation method is provided for a base station, where the method includes: receiving a request sent by a first terminal to establish end-to-end D2D communication with a second terminal; and the allocated D2D resource Determining a reusable resource that can be multiplexed by the first terminal and the second terminal;

 Allocating target resources from the reusable resources;

Transmitting the target resource to the first terminal and the second terminal, the first terminal transmitting a D2D communication signal according to the target resource, and receiving, by the second terminal, the D2D communication according to the target resource signal. In a first possible implementation manner of the eleventh aspect, the determining, by the allocated D2D resources, the reusable resources that can be multiplexed by the first terminal and the second terminal, includes:

 Transmitting, to the third terminal, a first instruction, where the first instruction is used to instruct the third terminal to listen to the discovery signal sent by the first terminal;

 Receiving a first response returned by the third terminal, where the first response is used to indicate whether a signal quality of the discovery signal monitored by the third terminal is less than a predetermined quality threshold;

 Sending, to the second terminal, a second instruction including the first resource, where the first response indicates that the signal quality of the discovery signal monitored by the third terminal is less than the predetermined quality threshold, a resource is a D2D resource that has been allocated to the third terminal for receiving a D2D communication signal, the second instruction is used to instruct the second terminal to monitor a D2D communication signal according to the first resource, and receive the second a second response returned by the terminal, the second response is used to indicate whether the signal strength of the D2D communication signal monitored by the second terminal according to the first resource is less than a predetermined intensity threshold; if the second response is received And indicating that the signal strength of the D2D communication signal that is monitored by the second terminal according to the first resource is less than the predetermined strength threshold, determining the first resource as the reusable resource.

 With reference to the first possible implementation manner of the eleventh aspect, in a second possible implementation manner of the eleventh aspect, the receiving the first response returned by the third terminal includes:

 Receiving, by the third terminal, a first response frame that includes the first response, where the first response frame is sent by the third terminal according to the first resource after receiving the first instruction The first D2D communication frame.

 In a third possible implementation manner of the eleventh aspect, the determining, by the allocated D2D resources, the reusable resources that can be multiplexed by the first terminal and the second terminal, includes:

 Transmitting, to the second terminal, a third instruction that includes a second resource, where the second resource is a D2D resource that is allocated to the fourth terminal to receive the D2D communication signal, where the third instruction is used to indicate the The second terminal monitors the D2D communication signal according to the second resource;

 Receiving a third response returned by the second terminal, where the third response is used to indicate whether a signal strength of the D2D communication signal that is monitored by the second terminal according to the second resource is less than a predetermined intensity threshold; The third response indicates that the signal strength of the D2D communication signal that the second terminal monitors according to the second resource is less than the predetermined intensity threshold, and sends a fourth instruction to the fourth terminal, where the fourth command is used to indicate The fourth terminal listens to the discovery signal sent by the first terminal;

Receiving a fourth response returned by the fourth terminal, where the fourth response is used to indicate the fourth terminal Whether the signal quality of the detected signal is less than a predetermined quality threshold;

 And if the received fourth response indicates that the signal quality of the discovery signal monitored by the fourth terminal is less than the predetermined quality threshold, determining the second resource as the reusable resource.

 With reference to the third possible implementation manner of the eleventh aspect, in a fourth possible implementation manner of the eleventh aspect, the receiving the fourth response returned by the fourth terminal includes:

 Receiving, by the fourth terminal, a second response frame that includes the fourth response, where the second response frame is sent by the fourth terminal according to the second resource after receiving the fourth instruction The first D2D communication frame.

 With reference to the eleventh aspect, the first possible implementation manner of the first aspect, the second possible implementation manner of the eleventh aspect, the third possible implementation manner of the eleventh aspect, or the fourth In a fifth possible implementation manner of the eleventh aspect, the method further includes: detecting, after the target resource is allocated from the reusable resource, whether the target resource is sufficient; If the target resource is insufficient, it is detected whether there is an idle D2D resource; if the detection result is that there is an idle D2D resource, the target resource is allocated from the idle D2D resource.

 With reference to the eleventh aspect, the first possible implementation manner of the eleventh aspect, the second possible implementation manner of the eleventh aspect, the third possible implementation manner of the eleventh aspect, or the fourth eleventh aspect A possible implementation manner, in a sixth possible implementation manner of the eleventh aspect, before the allocating the target resource from the reusable resource, the method further includes:

 Detect whether there are idle D2D resources;

 If the detection result is that there is an idle D2D resource, the target resource is allocated from the idle D2D resource;

 Detecting whether the target resource is sufficient after the target resource is allocated from the idle D2D resource;

 If the detection result is that the target resource is insufficient, the step of allocating the target resource from the reusable resource is performed.

 A twelfth aspect provides a resource allocation method for a first terminal, where the method includes: sending, to a base station, a request for establishing end-to-end D2D communication with a second terminal, where the request is used to indicate Determining, by the base station, reusable resources that can be multiplexed by the first terminal and the second terminal in the allocated D2D resources, and allocating target resources from the reusable resources;

Receiving a target resource sent by the base station; And transmitting a D2D communication signal to the second terminal according to the target resource.

 In a first possible implementation manner of the twelfth aspect, the method further includes:

 The discovery signal is sent periodically.

 A thirteenth aspect provides a resource allocation method, in a second terminal, where the method includes: receiving a target resource sent by a base station, where the target resource is sent by the base station to be sent by the first terminal After the second terminal establishes a request for end-to-end D2D communication, determining, in the already allocated D2D resource, a reusable resource that can be multiplexed by the first terminal and the second terminal, and recovering from the Use resources allocated in resources;

 Receiving, by the target resource, a D2D communication signal sent by the first terminal.

 In a first possible implementation manner of the thirteenth aspect, before the receiving the target resource sent by the base station, the method further includes:

 Receiving, by the base station, a second instruction that includes a first resource, where the first resource is a D2D resource that has been allocated to a third terminal to receive a D2D communication signal;

 Listening to the D2D communication signal according to the first resource;

 Detecting a signal strength of the D2D communication signal that is monitored according to the first resource, and obtaining a first detection result;

 And sending, by the first detection result, a second response to the base station, where the second response is used to indicate whether a signal strength of the D2D communication signal that is monitored according to the first resource is less than a predetermined intensity threshold. In a second possible implementation manner of the thirteenth aspect, before the receiving the target resource that is sent by the base station, the method further includes:

 Receiving, by the base station, a third instruction that includes a second resource, where the second resource is a resource that is allocated to the fourth terminal to receive the D2D communication signal;

 Listening to the D2D communication signal according to the second resource;

 Detecting a signal strength of the D2D communication signal that is monitored according to the second resource, and obtaining a second detection result;

 And sending, by the second detection result, a third response to the base station, where the third response is used to indicate whether a signal strength of the D2D communication signal that is monitored according to the second resource is less than a predetermined intensity threshold.

 According to a fourteenth aspect, a resource allocation method is provided for a third terminal, where the method includes: receiving a first instruction sent by a base station, where the first instruction is sent by the base station after receiving the first terminal An instruction sent after a request for establishing a D2D communication with the second terminal;

Monitoring the discovery signal sent by the first terminal; Detecting a signal quality of the detected discovery signal, obtaining a third detection result; transmitting a first response to the base station according to the third detection result; and the monitored by the base station in the first response indication And when the signal quality of the discovery signal is less than a predetermined quality threshold, sending a second instruction including the first resource to the second terminal, and receiving a second response returned by the second terminal, and indicating the second response in the second response When the signal strength of the D2D communication signal monitored by the first resource is less than a predetermined strength threshold, the second terminal determines the first resource as a reusable resource, and allocates a target resource from the reusable resource. And sending the target resource to the first terminal and the second terminal, where the first terminal sends a D2D communication signal according to the target resource, and the second terminal receives the D2D according to the target resource. Communication signal

 The first resource is a D2D resource that has been allocated to the third terminal for receiving a D2D communication signal, and the second instruction is used to instruct the second terminal to monitor a D2D communication signal according to the first resource; The second response is used to indicate whether the signal strength of the D2D communication signal monitored by the second terminal according to the first resource is less than the predetermined intensity threshold.

 In a first possible implementation manner of the fourteenth aspect, the sending the first response to the base station according to the third detection result includes:

 Transmitting, to the base station, a first response frame that includes the first response, where the first response frame is a first D2D communication frame that is sent according to the first resource after receiving the first instruction.

 According to a fifteenth aspect, a method for allocating a resource is provided in a fourth terminal, where the method includes: receiving a fourth instruction sent by a base station; where the fourth instruction is sent by the base station after receiving the first terminal a request for establishing D2D communication with the second terminal, transmitting, to the second terminal, a third instruction including the second resource, receiving a third response returned by the second terminal, and indicating the third response The second terminal is configured to send an instruction when the signal strength of the D2D communication signal monitored by the second resource is less than a predetermined intensity threshold; the second resource is a resource that is allocated to the fourth terminal to receive the D2D communication signal. The third command is used to indicate that the second terminal monitors the D2D communication signal according to the second resource, and the third response is used to indicate that the second terminal monitors the D2D communication signal according to the second resource. Whether the signal strength is less than the predetermined intensity threshold;

 Monitoring the discovery signal sent by the first terminal;

 Detecting the signal quality of the detected discovery signal, and obtaining a fourth detection result;

And transmitting, according to the fourth detection result, a fourth response to the base station; the fourth response is used to indicate whether the signal quality of the monitored discovery signal is less than a predetermined quality threshold; and the fourth response by the base station When it is indicated that the signal quality of the discovered discovery signal is less than the predetermined quality threshold, Determining, by the second resource, a reusable resource, allocating a target resource from the reusable resource, and sending the target resource to the first terminal and the second terminal, by using the first terminal Transmitting a D2D communication signal according to the target resource, and receiving, by the second terminal, a D2D communication signal according to the target resource.

 In a first possible implementation manner of the fifteenth aspect, the sending, by the fourth detection result, the fourth response to the base station according to the fourth detection result includes:

 Transmitting, to the base station, a second response frame that includes the fourth response, where the second response frame is the first D2D communication sent according to the second resource after receiving the fourth instruction frame.

 In a sixteenth aspect, a resource allocation system is provided, the system comprising:

 A base station, a first terminal, a second terminal, and at least one third terminal and/or at least one fourth terminal as described in the above aspect.

 The beneficial effects of the technical solutions provided by the embodiments of the present invention are:

 After receiving the request for establishing end-to-end D2D communication with the second terminal, the first terminal and the second terminal reusable resources are determined in the already allocated D2D resources, and are reusable The allocation of the target resource in the resource solves the problem that in the prior art, when there are a large number of terminals requesting to establish D2D communication within the coverage of the base station, there may be a situation that no idle D2D resources are available for allocation, thereby improving resource utilization and system capacity. the goal of. DRAWINGS

 In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in light of the inventive work.

 1 is a device configuration diagram of a base station according to an embodiment of the present invention;

 2 is a device configuration diagram of a base station according to another embodiment of the present invention;

 3 is a device configuration diagram of a base station according to another embodiment of the present invention;

 4 is a device configuration diagram of a base station according to still another embodiment of the present invention;

 FIG. 5 is a schematic structural diagram of a device of a first terminal according to an embodiment of the present invention; FIG.

 6 is a device configuration diagram of a first terminal according to another embodiment of the present invention;

 FIG. 7 is a schematic structural diagram of a device of a first terminal according to another embodiment of the present invention; FIG.

FIG. 8 is a schematic structural diagram of a device of a first terminal according to still another embodiment of the present invention; FIG. FIG. 9 is a structural diagram of a device of a second terminal according to an embodiment of the present invention;

 FIG. 10 is a schematic structural diagram of a device of a second terminal according to another embodiment of the present invention; FIG.

 11 is a device configuration diagram of a second terminal according to another embodiment of the present invention;

 FIG. 12 is a schematic structural diagram of a device of a second terminal according to still another embodiment of the present invention; FIG.

 FIG. 13 is a schematic structural diagram of a device of a third terminal according to an embodiment of the present invention; FIG.

 FIG. 14 is a schematic structural diagram of a device of a third terminal according to another embodiment of the present invention; FIG.

 15 is a device configuration diagram of a third terminal according to another embodiment of the present invention;

 16 is a device configuration diagram of a third terminal according to still another embodiment of the present invention;

 17 is a device configuration diagram of a fourth terminal according to an embodiment of the present invention;

 18 is a device configuration diagram of a fourth terminal according to another embodiment of the present invention;

 19 is a device configuration diagram of a fourth terminal according to another embodiment of the present invention;

 20 is a device configuration diagram of a fourth terminal according to still another embodiment of the present invention;

 21 is a flowchart of a method for resource allocation according to an embodiment of the present invention;

 FIG. 22 is a flowchart of a method for resource allocation according to another embodiment of the present invention;

 23 is a flowchart of a method for resource allocation according to another embodiment of the present invention;

 24 is a flowchart of a method for resource allocation according to an embodiment of the present invention;

 25 is a flowchart of a method for resource allocation according to another embodiment of the present invention;

 26 is a flowchart of a method for resource allocation according to an embodiment of the present invention;

 FIG. 27 is a flowchart of a method for resource allocation according to another embodiment of the present invention;

 28 is a flowchart of a method for resource allocation according to another embodiment of the present invention;

 29 is a flowchart of a method for resource allocation according to an embodiment of the present invention;

 FIG. 30 is a flowchart of a method for resource allocation according to another embodiment of the present invention;

 FIG. 31 is a flowchart of a method for resource allocation according to an embodiment of the present invention;

 32 is a flowchart of a method for resource allocation according to another embodiment of the present invention;

 33 is a flowchart of a method for resource allocation according to an embodiment of the present invention;

 FIG. 34 is a flowchart of a method for resource allocation according to another embodiment of the present invention;

 FIG. 35 is a system configuration diagram of a resource allocation system according to an embodiment of the present invention. detailed description

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Referring to FIG. 1, a device configuration diagram of a base station according to an embodiment of the present invention is shown. The base station can be used to allocate D2D resources for terminals requesting D2D communication. The base station can include:

 The request receiving module 101 is configured to receive a request sent by the first terminal to establish end-to-end D2D communication with the second terminal;

 The resource determining module 102 is configured to determine, in the already allocated D2D resources, a reusable resource that can be multiplexed by the first terminal and the second terminal;

 The signal quality of the discovery signal sent by the first terminal received by the terminal allocated to receive the D2D communication is less than a predetermined quality threshold, and the signal strength of the D2D communication signal received by the second terminal is less than A resource with a predetermined intensity threshold.

 Specifically, the reusable resource needs to meet two conditions: first, the signal quality of the discovery signal sent by the first terminal received by the terminal that is allocated to receive the D2D communication is less than a predetermined quality threshold; Second, the signal strength of the D2D communication signal received by the second terminal according to the reusable resource is less than a predetermined intensity threshold.

 a first resource allocation module 103, configured to allocate a target resource from the reusable resource;

 The first resource sending module 104 is configured to send the target resource to the first terminal, where the first terminal sends a D2D communication signal according to the target resource;

 The second resource sending module 105 is configured to send the target resource to the second terminal, and the second terminal receives the D2D communication signal according to the target resource.

 In summary, the base station provided by the embodiment of the present invention determines the first terminal and the first D2D resource in the allocated D2D resource after receiving the request for establishing the end-to-end D2D communication with the second terminal, which is sent by the first terminal. The second terminal is multiplexable and allocates the target resource from the reusable resource. When the number of terminals requesting D2D communication within the coverage of the base station is large in the prior art, there may be no idle D2D resources available for allocation. The problem of the situation is to achieve the purpose of improving resource utilization and system capacity. Referring to FIG. 2, a device configuration diagram of a base station according to another embodiment of the present invention is shown. The base station can be configured to allocate a D2D resource for transmitting a D2D communication signal to the second terminal for the first terminal requesting the D2D communication. The base station can include:

 The request receiving module 201 is configured to receive, by the first terminal, a request for establishing end-to-end D2D communication with the second terminal;

A terminal supporting D2D communication can periodically send a discovery signal on a predetermined time-frequency resource. The discovery signal, when the first terminal receives the discovery signal sent by the second terminal and detects that the second terminal can perform D2D communication, may send a request for D2D communication with the second terminal to the base station.

 The resource determining module 202 is configured to determine, in the already allocated D2D resources, a reusable resource that can be multiplexed by the first terminal and the second terminal;

 The signal quality of the discovery signal sent by the terminal allocated to receive the D2D communication to the first terminal is less than a predetermined quality threshold, and the signal strength of the D2D communication signal received by the second terminal is less than a predetermined one. The resource of the intensity threshold. The D2D resource can be a time-frequency resource.

 Specifically, the reusable resource needs to meet two conditions: first, the signal quality of the discovery signal sent by the first terminal received by the terminal that is allocated to receive the D2D communication is less than a predetermined quality threshold; Second, the signal strength of the D2D communication signal received by the second terminal according to the reusable resource is less than a predetermined intensity threshold. Wherein, satisfying the first condition indicates that when the first terminal transmits the D2D communication signal to the second terminal through the reusable resource, the terminal that receives the D2D communication signal using the reusable resource except the second terminal is not The second condition is met, indicating that the D2D communication signal sent by the terminal other than the first terminal using the reusable resource has no influence on the second terminal.

 The discovery signal sent by the first terminal may carry the reference content known in advance by each terminal. After receiving the discovery signal, each D2D terminal parses the discovery signal, and compares the content obtained by the analysis with the reference content to obtain an accurate analysis. Rate, and the resolution accuracy is taken as the signal quality of the received discovery signal transmitted by the first terminal.

 The discovery signal sent by the first terminal may be interfered by the discovery signal sent by other terminals. The receiving end receives the mixed signal of the discovery signal and the interference signal sent by the first terminal. If based on the signal strength, the receiving end can only measure the strength of the mixed signal, and cannot represent the signal of the first terminal. Intensity, therefore, the embodiment of the present invention sets the determination threshold according to the signal quality of the discovery signal of the first terminal, and can improve the accuracy of the determination.

 When detecting the interference on the allocated D2D resources, the second terminal needs to detect the total interference on a certain time-frequency resource, and does not need to distinguish which D2D terminals the interference comes from, therefore, it only needs to detect according to the allocated D2D. The signal strength of the communication signal received by the resource is sufficient.

 a first resource allocation module 203, configured to allocate a target resource from the reusable resource;

The base station may allocate some or all of the resources from all eligible reusable resources as target resources. The first resource sending module 204 is configured to send the target resource to the first terminal, where the first terminal sends a D2D communication signal according to the target resource;

 The second resource sending module 205 is configured to send the target resource to the second terminal, and the second terminal receives the D2D communication signal according to the target resource.

 The resource determining module 202 includes:

 The first instruction sending unit 202a is configured to send, to the third terminal, a first instruction, where the first instruction is used to instruct the third terminal to listen to the discovery signal sent by the first terminal;

 The first response receiving unit 202b is configured to receive a first response returned by the third terminal, where the first response is applied to indicate whether a signal quality of the discovery signal monitored by the third terminal is less than a predetermined quality threshold;

 The second instruction sending unit 202c is configured to: if the first response indicates that the signal quality of the discovery signal monitored by the third terminal is less than the predetermined quality threshold, send a second instruction including the first resource to the second terminal The first resource is a D2D resource that is allocated to the third terminal for receiving the D2D communication signal, and the second instruction is used to instruct the second terminal to monitor the D2D communication signal according to the first resource; the second response receiving unit 202d And receiving, by the second terminal, a second response, where the second response is used to indicate whether a signal strength of the D2D communication signal that is monitored by the second terminal according to the first resource is less than a predetermined intensity threshold;

 The first determining unit 202e is configured to determine, when the received second response indicates that the signal strength of the D2D communication signal monitored by the second terminal according to the first resource is less than the predetermined strength threshold, determining the first resource as the Reusable resources.

 The detection order of the above two conditions may be set according to actual conditions, and the first condition may be detected first, and then the second condition may be detected; or the second condition may be detected first, and then the first condition is detected.

When the first condition is detected first, and then the second condition is detected, the base station may send a first instruction to each terminal that has been allocated D2D resources for performing D2D communication by using the high layer signaling, after each D2D terminal receives the first instruction, Listening to the discovery signal Discovery signal sent by the first terminal on the predetermined time-frequency resource, and returning the first response to the base station according to the monitored discovery signal, and the base station determines, according to the first response, which terminals monitor the discovery sent by the first terminal. The signal quality of the signal is less than a predetermined quality threshold, and the D2D resource of the terminal allocated to the monitored signal of the first terminal transmitted by the monitored first terminal is determined to be the first resource. The base station sends a second indication that includes the first resource to the second terminal, and after receiving the second indication, the second terminal monitors according to the second resource. The D2D communication signal sent by the other terminal through the second resource, and the second response is returned to the base station according to the monitoring result, and the base station determines, according to the second response, that the signal strength of the D2D communication signal monitored by the second terminal is less than a predetermined signal strength threshold. Resources are reusable resources.

 It should be noted that, in the response returned by the second terminal or the D2D terminal to the base station, the strength of the monitored D2D communication signal or the signal quality of the discovery signal of the first terminal may be directly sent to the base station, and the base station detects whether the signal strength is less than Whether the predetermined strength threshold or the signal quality is less than the predetermined quality threshold; the second terminal or the D2D terminal may also first detect whether the signal strength is less than a predetermined intensity threshold or whether the signal quality is less than a predetermined quality threshold, and carry the detection result in the response and send it to the base station.

 The first response receiving unit 202b is configured to receive a first response frame that is sent by the third terminal and includes the first response, where the first response frame is that the third terminal receives the first instruction, according to the The first D2D communication frame sent by the first resource.

 The resource determining module 202 includes:

 The third instruction sending unit 202f is configured to send, to the second terminal, a third instruction that includes a second resource, where the second resource is a D2D resource that is allocated to the fourth terminal to receive the D2D communication signal; And configured to instruct the second terminal to monitor the D2D communication signal according to the second resource;

 The third response receiving unit 202g is configured to receive a third response returned by the second terminal, where the third response is used to indicate whether the signal strength of the D2D communication signal monitored by the second terminal according to the second resource is less than a predetermined intensity threshold. ;

 The fourth command sending unit 202h is configured to: if the third response indicates that the signal strength of the D2D communication signal monitored by the second terminal according to the second resource is less than the predetermined intensity threshold, send a fourth instruction to the fourth terminal, The fourth instruction is used to instruct the fourth terminal to listen to the discovery signal sent by the first terminal;

 The fourth response receiving unit 202i is configured to receive a fourth response returned by the fourth terminal, where the fourth response is applied to indicate whether the signal quality of the discovery signal monitored by the fourth terminal is less than a predetermined quality threshold;

 The second determining unit 202j is configured to determine the second resource as the reusable resource if the received fourth response indicates that the signal quality of the discovery signal monitored by the fourth terminal is less than the predetermined quality threshold.

When the second condition is detected first, and then the first condition is detected, the base station may send the currently allocated D2D resource to the second terminal by using the high layer signaling, and the second terminal monitors the D2D resource according to the base station. Listening to the D2D communication signal, and returning a third response to the base station according to the monitoring result, the base station determining, according to the third response, that the D2D resource whose signal strength of the D2D communication signal received by the second terminal is less than a predetermined intensity threshold is the second resource, and The terminal that allocates the second resource to receive the D2D communication signal is determined to be the fourth terminal. The base station sends a fourth command to the fourth terminal. After receiving the command, the fourth terminal monitors the discovery signal sent by the first terminal on the predetermined resource, and returns a fourth response to the base station according to the monitoring result, and the base station responds according to the fourth response. In the fourth terminal, the resource for receiving the D2D communication signal corresponding to the terminal that monitors the signal quality of the discovery signal sent by the first terminal is less than the predetermined quality threshold is determined as a reusable resource.

 The fourth response receiving unit 202i is configured to receive a second response frame that is sent by the fourth terminal and includes the fourth response, where the second response frame is that the fourth terminal receives the fourth command, according to the The first D2D communication frame sent by the second resource.

 When the terminal that has been allocated the D2D resource returns a response to the base station, the terminal may return a response to the base station by using the allocated resource for transmitting the D2D signal. For example, the response returned to the base station may be carried by receiving the first instruction or The first OFDM (Orthogonal Frequency Division Multiplexing) symbol in the first D2D communication frame transmitted after the fourth instruction. After transmitting the first instruction or the fourth instruction, the base station receives the first D2D communication frame sent according to the allocated D2D resource, and parses the first OFDM symbol in the received D2D communication frame to obtain the return of each D2D terminal. The first response or the fourth response.

 In addition, it should be noted that the resources used by the second terminal to return the second response or the third response to the base station may be dynamically configured by the base station.

 The base station also includes:

 The first detecting module 206 is configured to detect whether the target resource is sufficient after the target resource is allocated from the reusable resource;

 The second detecting module 207 is configured to detect whether there is an idle D2D resource if the detection result of the first detecting module 206 is that the target resource is insufficient;

 The second resource allocation module 208 is configured to allocate the target resource from the idle D2D resource if the detection result of the second detecting module 207 is that there is a free D2D resource.

 The base station can allocate some resources or all resources as the target resources from the idle D2D resources according to the actual situation.

When allocating D2D resources, the base station may consider allocating idle D2D resources first, and then considering multiplexing the allocated D2D resources when no idle D2D resources are available for allocation; or, the base station may first The allocated D2D resources are multiplexed, and the free D2D resources are allocated when there are no D2D resources available for multiplexing.

 For example, if the base station first considers multiplexing the allocated D2D resources and then considers allocating the idle D2D resources, after the base station allocates the target resources from the reusable resources, the base station can detect whether the target resources are sufficient, and if sufficient, the resources are no longer allocated. Idle D2D resources, otherwise, target resources are further allocated from idle D2D resources.

 The base station also includes:

 The third detecting module 209 is configured to detect whether there is an idle D2D resource before the first resource allocation module 203 allocates the target resource from the reusable resource;

 The third resource allocation module 210 is configured to allocate the target resource from the idle D2D resource if the detection result of the third detecting module 209 is that there is a free D2D resource;

 Similarly, the base station can allocate part of the resources or all resources as the target resources from the idle D2D resources in combination with the actual situation.

 a fourth detecting module 211, configured to detect whether the target resource is sufficient after the target resource is allocated from the idle D2D resource;

 The first resource allocation module 203 is configured to perform the step of allocating the target resource from the reusable resource if the detection result of the fourth detecting module 211 is that the target resource is insufficient.

 If the base station first considers allocating idle D2D resources and then considering multiplexing the allocated D2D resources, the base station detects whether there are idle D2D resources before allocating the target resources from the reusable resources, and if so, is idle. The target resource is allocated in the D2D resource. If the target resource is still insufficient after the target resource is allocated from the idle D2D resource, the target resource is further allocated from the reusable resource. In addition, if the target resource allocated from the idle D2D resource is sufficient, the base station may not perform the step of determining the reusable resource subsequently, thereby saving system resources and reducing consumption.

 Alternatively, when the third command is sent to the second terminal, the base station may send all the allocated D2D resources and the idle D2D resources to the second terminal, and the second terminal monitors the D2D communication signal according to all the D2D resources, and according to the monitoring result. Returning a third response to the base station, the base station determining whether there is an idle resource in the resource whose signal strength of the D2D communication signal received by the second terminal is less than a predetermined intensity threshold, and if yes, preferentially allocating the target resource from the idle resource. If there are no idle resources or insufficient idle resources, the base station further performs the step of transmitting a fourth instruction to the fourth terminal.

In summary, the base station provided by the embodiment of the present invention determines the first among the allocated D2D resources after receiving the request for establishing the end-to-end D2D communication with the second terminal, which is sent by the first terminal. A resource that can be multiplexed by the terminal and the second terminal, and a target resource is allocated from the reusable resource, which solves the problem that in the prior art, when there are a large number of terminals requesting to establish D2D communication within the coverage of the base station, there may be no idle D2D resources. The problem of the situation that can be allocated to achieve the purpose of improving resource utilization and system capacity. Referring to FIG. 3, it shows a device configuration diagram of a base station according to another embodiment of the present invention. The base station can be used to allocate D2D resources for terminals requesting D2D communication. The base station may include: a receiver 001, a processor 002, and a transmitter 003;

 The receiver 001 is configured to receive a request sent by the first terminal to establish end-to-end D2D communication with the second terminal;

 The processor 002 is configured to determine, in the already allocated D2D resources, a reusable resource that can be multiplexed by the first terminal and the second terminal;

 The processor 002 is configured to allocate a target resource from the reusable resource;

 The processor 002 is configured to control the transmitter 003 to send the target resource to the first terminal and the second terminal, where the first terminal sends a D2D communication signal according to the target resource, and the second terminal is configured according to the The target resource receives the D2D communication signal.

 In summary, the base station provided by the embodiment of the present invention determines the first terminal and the first D2D resource in the allocated D2D resource after receiving the request for establishing the end-to-end D2D communication with the second terminal, which is sent by the first terminal. The second terminal is multiplexable and allocates the target resource from the reusable resource. When the number of terminals requesting D2D communication within the coverage of the base station is large in the prior art, there may be no idle D2D resources available for allocation. The problem of the situation is to achieve the purpose of improving resource utilization and system capacity. Referring to FIG. 4, a device configuration diagram of a base station according to still another embodiment of the present invention is shown. The base station can be configured to allocate a D2D resource for transmitting a D2D communication signal to the second terminal for the first terminal requesting the D2D communication. The base station can include: a receiver 004, a processor 005, and a transmitter 006;

 The receiver 004 is configured to receive a request sent by the first terminal to establish end-to-end D2D communication with the second terminal.

Specifically, the terminal supporting the D2D communication may periodically send the discovery signal Discovery signal on the predetermined time-frequency resource, when the first terminal receives the discovery signal sent by the second terminal and detects that the D2D communication can be performed with the second terminal. Sending a D2D connection with the second terminal to the base station Letter request.

 The processor 005 is configured to determine, in the already allocated D2D resources, a reusable resource that can be multiplexed by the first terminal and the second terminal;

 The signal quality of the discovery signal sent by the first terminal received by the terminal allocated to receive the D2D communication is less than a predetermined quality threshold, and the signal strength of the D2D communication signal received by the second terminal is less than A resource with a predetermined intensity threshold. The D2D resource can be a time-frequency resource.

 Specifically, the reusable resource needs to meet two conditions: first, the signal quality of the discovery signal sent by the first terminal received by the terminal that is allocated to receive the D2D communication is less than a predetermined quality threshold; Second, the signal strength of the D2D communication signal received by the second terminal according to the reusable resource is less than a predetermined intensity threshold. Wherein, satisfying the first condition indicates that when the first terminal transmits the D2D communication signal to the second terminal through the reusable resource, the terminal that receives the D2D communication signal using the reusable resource except the second terminal is not The second condition is met, indicating that the D2D communication signal sent by the terminal other than the first terminal using the reusable resource has no influence on the second terminal.

 The discovery signal sent by the first terminal may carry the reference content known in advance by each terminal. After receiving the discovery signal, each D2D terminal parses the discovery signal, and compares the content obtained by the analysis with the reference content to obtain an accurate analysis. Rate, and the resolution accuracy is taken as the signal quality of the received discovery signal transmitted by the first terminal.

 The discovery signal sent by the first terminal may be interfered by the discovery signal sent by other terminals. The receiving end receives the mixed signal of the discovery signal and the interference signal sent by the first terminal. If based on the signal strength, the receiving end can only measure the strength of the mixed signal, and cannot represent the signal of the first terminal. Intensity, therefore, the embodiment of the present invention sets the determination threshold according to the signal quality of the discovery signal of the first terminal, and can improve the accuracy of the determination.

 When the second terminal detects the interference of the signal received according to the allocated D2D resource, it needs to detect the total interference on a certain time-frequency resource, and does not need to distinguish which D2D terminal the interference comes from, therefore, only need to detect The signal strength of the communication signal received according to the allocated D2D resource may be used.

 The processor 005 is configured to allocate a target resource from the reusable resource;

 The base station can allocate some or all of the resources from all eligible reusable resources as target resources.

The processor 005 is configured to control the transmitter 006 to send the target resource to the first terminal and The second terminal transmits, by the first terminal, a D2D communication signal according to the target resource, and the second terminal receives the D2D communication signal according to the target resource.

 The processor 005 is configured to control the transmitter 005 to send a first instruction to the third terminal, where the first instruction is used to instruct the third terminal to listen to the discovery signal sent by the first terminal;

 The receiver 004 is configured to receive a first response returned by the third terminal, where the first response is used to indicate whether a signal quality of the discovery signal monitored by the third terminal is less than a predetermined quality threshold;

 The processor 005 is configured to: if the first response indicates that the signal quality of the discovery signal monitored by the third terminal is less than the predetermined quality threshold, control the transmitter to send the first resource to the second terminal a second command, the first resource is a D2D resource that is allocated to the third terminal to receive the D2D communication signal, and the second instruction is used to instruct the second terminal to monitor the D2D communication signal according to the first resource;

 The receiver 004 is configured to receive a second response returned by the second terminal, where the second response is used to indicate whether a signal strength of the D2D communication signal monitored by the second terminal according to the first resource is less than a predetermined intensity threshold;

 The processor 005 is configured to: if the second response received by the receiver 004 indicates that the signal strength of the D2D communication signal monitored by the second terminal according to the first resource is less than the predetermined strength threshold, the first resource is used. Determined as this reusable resource.

 The detection order of the above two conditions may be set according to actual conditions, and the first condition may be detected first, and then the second condition may be detected; or the second condition may be detected first, and then the first condition is detected.

When the first condition is detected first, and then the second condition is detected, the base station may send a first instruction to each terminal that has been allocated D2D resources for performing D2D communication by using the high layer signaling, after each D2D terminal receives the first instruction, Listening to the discovery signal Discovery signal sent by the first terminal on the predetermined time-frequency resource, and returning the first response to the base station according to the monitored discovery signal, and the base station determines, according to the first response, which terminals monitor the discovery sent by the first terminal. The signal quality of the signal is less than a predetermined quality threshold, and the D2D resource of the terminal allocated to the monitored signal of the first terminal transmitted by the monitored first terminal is determined to be the first resource. The base station sends a second indication including the first resource to the second terminal, and after receiving the second indication, the second terminal monitors the D2D communication signal sent by the other terminal through the second resource according to the second resource, and according to the monitoring As a result, the second response is returned to the base station, and the base station determines, according to the second response, that the resource whose signal strength of the D2D communication signal monitored by the second terminal is less than the predetermined signal strength threshold is a reusable resource. It should be noted that, in the response returned by the D2D terminal or the second terminal to the base station, the strength of the monitored D2D communication signal or the signal quality of the discovery signal of the first terminal may be directly sent to the base station, and the base station detects whether the signal strength is less than Whether the predetermined intensity threshold or the signal quality is less than the predetermined quality threshold; or the D2D terminal or the second terminal may first detect whether the signal strength is less than a predetermined intensity threshold or whether the signal quality is less than a predetermined quality threshold, and the detection result is carried in the response and sent to the response Base station.

 The receiver 004 is configured to receive a first response frame that is sent by the third terminal and includes the first response, where the first response frame is that the third terminal receives the first instruction, according to the first resource. The first D2D communication frame sent.

 The processor 005 is configured to control the transmitter 006 to send, to the second terminal, a third instruction that includes a second resource, where the second resource is a D2D resource that is allocated to the fourth terminal to receive the D2D communication signal; The third command is used to indicate that the second terminal monitors the D2D communication signal according to the second resource; the receiver 004 is configured to receive a third response returned by the second terminal, where the third response is used to indicate that the second terminal is configured according to Whether the signal strength of the D2D communication signal monitored by the second resource is less than a predetermined intensity threshold;

 The processor 005 is configured to: if the third response indicates that the signal strength of the D2D communication signal monitored by the second terminal according to the second resource is less than the predetermined intensity threshold, then control the transmitter to send the fourth terminal to the fourth terminal. The fourth instruction is used to instruct the fourth terminal to listen to the discovery signal sent by the first terminal;

 The receiver 004 is configured to receive a fourth response returned by the fourth terminal, where the fourth response is used to indicate whether a signal quality of the discovery signal monitored by the fourth terminal is less than a predetermined quality threshold;

 The processor 005 is configured to determine the second resource as the recoverable if the fourth response received by the receiver 004 indicates that the signal quality of the discovery signal monitored by the fourth terminal is less than the predetermined quality threshold. Use resources.

When detecting the second condition and detecting the first condition, the base station may send the currently allocated D2D resource to the second terminal by using the high layer signaling, and the second terminal monitors the D2D communication signal according to the D2D resource sent by the base station, and according to The monitoring result returns a third response to the base station, and the base station determines, according to the third response, that the D2D resource whose signal strength of the D2D communication signal received by the second terminal is less than a predetermined intensity threshold is the second resource, and allocates the second resource to The terminal receiving the D2D communication signal is determined to be the fourth terminal. The base station sends a fourth command to the fourth terminal. After receiving the command, the fourth terminal monitors the discovery signal sent by the first terminal on the predetermined resource, and returns the fourth ring to the base station according to the monitoring result. The base station determines, according to the fourth response, the resource for receiving the D2D communication signal corresponding to the terminal that the signal quality of the discovery signal sent by the first terminal is less than the predetermined quality threshold is determined as the reusable resource.

 The receiver 004 is configured to receive a second response frame that is sent by the fourth terminal and includes the fourth response, where the second response frame is that the fourth terminal receives the fourth instruction, according to the second resource. The first D2D communication frame sent.

 When the terminal that has been allocated the D2D resource returns a response to the base station, the terminal may return a response to the base station by using the allocated resource for transmitting the D2D signal. For example, the response returned to the base station may be carried by receiving the first instruction or The first OFDM (Orthogonal Frequency Division Multiplexing) symbol in the first D2D communication frame transmitted after the fourth instruction. After transmitting the first instruction or the fourth instruction, the base station receives the first D2D communication frame sent according to the allocated D2D resource, and parses the first OFDM symbol in the received D2D communication frame to obtain the return of each D2D terminal. The first response or the fourth response.

 In addition, it should be noted that the resources used by the second terminal to return the second response or the third response to the base station may be dynamically configured by the base station.

 The processor 005 is further configured to detect whether the target resource is sufficient after the target resource is allocated from the reusable resource;

 The processor 005 is configured to detect whether there is an idle D2D resource if the detection result is that the target resource is insufficient;

 The processor 005 is configured to allocate the target resource from the idle D2D resource if the detection result is that there is an idle D2D resource.

 The base station can allocate some resources or all resources as the target resources from the idle D2D resources according to the actual situation.

 When allocating D2D resources, the base station may consider allocating idle D2D resources first, and then considering multiplexing the allocated D2D resources when no idle D2D resources are available for allocation; or, the base station may first reuse the allocated D2D resources. When there are no D2D resources available for reuse, allocate free D2D resources.

For example, if the base station first considers multiplexing the allocated D2D resources and then considers allocating the idle D2D resources, after the base station allocates the target resources from the reusable resources, the base station can detect whether the target resources are sufficient, and if sufficient, the resources are no longer allocated. Idle D2D resources, otherwise, target resources are further allocated from idle D2D resources. The processor 005 is configured to detect whether there is an idle D2D resource before allocating the target resource from the reusable resource;

 The processor 005 is configured to: if the detection result is that there is an idle D2D resource, allocate the target resource from the idle D2D resource;

 The processor 005 is configured to detect whether the target resource is sufficient after the target resource is allocated from the idle D2D resource.

 The processor 005 is configured to perform the step of allocating the target resource from the reusable resource if the detection result is that the target resource is insufficient.

 If the base station first considers allocating idle D2D resources and then considering multiplexing the allocated D2D resources, the base station detects whether there are idle D2D resources before allocating the target resources from the reusable resources, and if so, is idle. The target resource is allocated in the D2D resource. If the target resource is still insufficient after the target resource is allocated from the idle D2D resource, the target resource is further allocated from the reusable resource. In addition, if the target resource allocated from the idle D2D resource is sufficient, the base station may not perform the step of determining the reusable resource subsequently, thereby saving system resources and reducing consumption.

 Alternatively, when the third command is sent to the second terminal, the base station may send all the allocated D2D resources and the idle D2D resources to the second terminal, and the second terminal monitors the D2D communication signal according to all the D2D resources, and according to the monitoring result. Returning a third response to the base station, the base station determining whether there is an idle resource in the resource whose signal strength of the D2D communication signal received by the second terminal is less than a predetermined intensity threshold, and if yes, preferentially allocating the target resource from the idle resource. If there are no idle resources or insufficient idle resources, the base station further performs the step of transmitting a fourth instruction to the fourth terminal.

 In summary, the base station provided by the embodiment of the present invention determines the first terminal and the first D2D resource in the allocated D2D resource after receiving the request for establishing the end-to-end D2D communication with the second terminal, which is sent by the first terminal. The second terminal is multiplexable and allocates the target resource from the reusable resource. When the number of terminals requesting D2D communication within the coverage of the base station is large, there may be no idle D2D resources available for allocation. The problem of the situation is to achieve the purpose of improving resource utilization and system capacity. Referring to FIG. 5, it shows a device configuration diagram of a first terminal according to an embodiment of the present invention. The first terminal may be configured to request, from the base station, a D2D resource for transmitting a D2D communication signal to the second terminal. The first terminal may include:

The request sending module 301 is configured to send, to the base station, an end-to-end D2D communication with the second terminal. And the request is used to indicate that the base station determines, among the allocated D2D resources, a reusable resource that can be multiplexed by the first terminal and the second terminal, and allocates a target resource from the reusable resource; a resource receiving module 302, configured to receive a target resource sent by the base station;

 The communication signal sending module 303 is configured to send a D2D communication signal to the second terminal according to the target resource.

 In summary, the first terminal provided by the embodiment of the present invention, by transmitting a request for establishing D2D communication with the second terminal to the base station, is allocated by the base station from the allocated D2D resources and can be reused by the first terminal and the second terminal. And transmitting the D2D communication signal according to the resource allocated by the base station, which solves the problem that in the prior art, when the number of terminals requesting to establish D2D communication within the coverage of the base station is large, there may be a situation that no idle D2D resource is available for allocation. Achieve the goal of improving resource utilization and system capacity. Referring to FIG. 6, a device configuration diagram of a first terminal according to another embodiment of the present invention is shown. The first terminal may be configured to request, from the base station, a D2D resource for transmitting a D2D communication signal to the second terminal. The first terminal may include:

 The request sending module 401 is configured to send, to the base station, a request for establishing end-to-end D2D communication with the second terminal, where the request is used to indicate that the base station determines, by the allocated D2D resources, that the first terminal and the second a terminal multiplexed reusable resource, and a target resource is allocated from the reusable resource; the terminal supporting the D2D communication may send the discovery signal Discovery signal on the predetermined time-frequency resource, when the first terminal receives the second terminal to send The discovery signal and detecting that the D2D communication can be performed with the second terminal may send a request for D2D communication with the second terminal to the base station.

 The signal quality of the discovery signal sent by the first terminal received by the terminal allocated to receive the D2D communication is less than a predetermined quality threshold, and the signal strength of the D2D communication signal received by the second terminal is less than A resource with a predetermined intensity threshold. The D2D resource can be a time-frequency resource.

Specifically, the reusable resource needs to meet two conditions: first, the signal quality of the discovery signal sent by the first terminal received by the terminal that is allocated to receive the D2D communication is less than a predetermined quality threshold; Second, the signal strength of the D2D communication signal received by the second terminal according to the reusable resource is less than a predetermined intensity threshold. Wherein, satisfying the first condition indicates that when the first terminal transmits the D2D communication signal to the second terminal through the reusable resource, the terminal that receives the D2D communication signal using the reusable resource except the second terminal is not Will have an impact; satisfying the second condition that the D2D communication signal sent by the terminal other than the first terminal using the reusable resource is not for the second terminal Will have an impact. For a specific method for the base station to determine the reusable resource, refer to the description in the corresponding embodiment of the base station shown in FIG. 2, which is not described in this embodiment.

 The first resource receiving module 402 is configured to receive a target resource sent by the base station;

 The communication signal sending module 403 is configured to send a D2D communication signal to the second terminal according to the target resource.

 The first terminal further includes:

 The discovery signal sending module 404 is configured to periodically send the discovery signal.

 The discovery signal sent by the first terminal may carry the reference content that is known in advance by each terminal. After receiving the discovery signal, each D2D terminal parses the discovery signal, and compares the content obtained by the analysis with the reference content to obtain Determining the accuracy rate, and using the parsing accuracy as the signal quality of the received discovery signal sent by the first terminal, and subsequently assisting the base station to determine the reusable resource according to the signal quality of the discovery signal sent by the first terminal, as shown in the figure. The base station shown in FIG. 2 corresponds to the description in the embodiment, and is not described in this embodiment.

 In summary, the first terminal provided by the embodiment of the present invention, by transmitting a request for establishing D2D communication with the second terminal to the base station, is allocated by the base station from the allocated D2D resources and can be reused by the first terminal and the second terminal. And transmitting the D2D communication signal according to the resource allocated by the base station, which solves the problem that in the prior art, when the number of terminals requesting to establish D2D communication within the coverage of the base station is large, there may be a situation that no idle D2D resource is available for allocation. Achieve the goal of improving resource utilization and system capacity. Referring to FIG. 7, a device configuration diagram of a first terminal according to another embodiment of the present invention is shown. The first terminal may be configured to request, from the base station, a D2D resource for transmitting a D2D communication signal to the second terminal. The first terminal may include: a processor 007, a transmitter 008, and a receiver 009;

 The processor 007 is configured to control the transmitter 008 to send, to the base station, a request for establishing end-to-end D2D communication with the second terminal, where the request is used to indicate that the base station determines, in the already allocated D2D resource, that the first a reusable resource multiplexed by the terminal and the second terminal, and a target resource is allocated from the reusable resource;

 The receiver 009 is configured to receive a target resource sent by the base station;

 The processor 007 is configured to control the transmitter 008 to send a D2D communication signal to the second terminal according to the target resource.

In summary, the first terminal provided by the embodiment of the present invention is configured to send to the base station by sending to the second terminal. In the request of the D2D communication, the base station allocates resources that can be multiplexed by the first terminal and the second terminal from the allocated D2D resources, and sends the D2D communication signal according to the resources allocated by the base station, which solves the problem of the base station coverage in the prior art. When the number of terminals requesting to establish D2D communication is large, there may be a problem that no idle D2D resources are available for allocation, and the purpose of improving resource utilization and system capacity is achieved. Referring to FIG. 8, a device configuration diagram of a first terminal according to still another embodiment of the present invention is shown. The first terminal may be configured to request, from the base station, a D2D resource for transmitting a D2D communication signal to the second terminal. The first terminal may include: a processor 010, a transmitter 011, and a receiver 012;

 The processor 010 is configured to control the transmitter 011 to send, to the base station, a request for establishing end-to-end D2D communication with the second terminal, where the request is used to indicate that the base station determines, in the already allocated D2D resource, that the first a reusable resource multiplexed by the terminal and the second terminal, and a target resource is allocated from the reusable resource;

 The terminal supporting the D2D communication may send the discovery signal Discovery signal on the predetermined time-frequency resource. When the first terminal receives the discovery signal sent by the second terminal and detects that the second terminal can perform D2D communication, the terminal may send and send to the base station. The second terminal makes a request for D2D communication.

 The signal quality of the discovery signal sent by the first terminal received by the terminal allocated to receive the D2D communication is less than a predetermined quality threshold, and the signal strength of the D2D communication signal received by the second terminal is less than A resource with a predetermined intensity threshold. The D2D resource can be a time-frequency resource.

 Specifically, the reusable resource needs to meet two conditions: first, the signal quality of the discovery signal sent by the first terminal received by the terminal that is allocated to receive the D2D communication is less than a predetermined quality threshold; Second, the signal strength of the D2D communication signal received by the second terminal according to the reusable resource is less than a predetermined intensity threshold. Wherein, satisfying the first condition indicates that when the first terminal transmits the D2D communication signal to the second terminal through the reusable resource, the terminal that receives the D2D communication signal using the reusable resource except the second terminal is not The second condition is met, indicating that the D2D communication signal sent by the terminal other than the first terminal using the reusable resource has no influence on the second terminal. For a specific method for the base station to determine the reusable resource, refer to the description in the corresponding embodiment of the base station shown in FIG. 4, which is not described in this embodiment.

 The receiver 012 is configured to receive a target resource sent by the base station;

The processor 010 is configured to control the transmitter 011 to send a D2D communication signal to the second terminal according to the target resource. The processor 010 is further configured to control the transmitter 011 to periodically send a discovery signal. The discovery signal sent by the first terminal may carry the reference content that is known in advance by each terminal. After receiving the discovery signal, each D2D terminal parses the discovery signal, and compares the content obtained by the analysis with the reference content to obtain Determining the accuracy rate, and using the parsing accuracy as the signal quality of the received discovery signal sent by the first terminal, and subsequently assisting the base station to determine the reusable resource according to the signal quality of the discovery signal sent by the first terminal, as shown in the figure. The base station shown in FIG. 4 corresponds to the description in the embodiment, and is not described in this embodiment.

 In summary, the first terminal provided by the embodiment of the present invention, by transmitting a request for establishing D2D communication with the second terminal to the base station, is allocated by the base station from the allocated D2D resources and can be reused by the first terminal and the second terminal. And transmitting the D2D communication signal according to the resource allocated by the base station, which solves the problem that in the prior art, when the number of terminals requesting to establish D2D communication within the coverage of the base station is large, there may be a situation that no idle D2D resource is available for allocation. Achieve the goal of improving resource utilization and system capacity. Referring to FIG. 9, a device configuration diagram of a second terminal according to an embodiment of the present invention is shown. The second terminal may be configured to receive the D2D communication signal sent by the first terminal according to the D2D resource allocated by the base station. The second terminal can include:

 The second resource receiving module 501 is configured to receive a target resource that is sent by the base station, where the target resource is that the base station receives the request sent by the first terminal to establish end-to-end D2D communication with the second terminal, Determining, among the D2D resources, a reusable resource multiplexable by the first terminal and the second terminal, and a resource allocated from the reusable resource;

 The communication signal receiving module 502 is configured to receive the D2D communication signal sent by the first terminal according to the target resource.

In summary, the second terminal provided by the embodiment of the present invention can be reused by the receiving base station after determining the reusable resources that can be multiplexed by the first terminal and the second terminal in the allocated D2D resources. A target resource allocated in the resource, and receiving the D2D communication signal sent by the first base station according to the target resource, which solves the problem that in the prior art, when there are a large number of terminals requesting to establish D2D communication within the coverage of the base station, there may be no idle D2D resources. The problem of the situation that can be allocated to achieve the purpose of improving resource utilization and system capacity. Referring to FIG. 10, it shows a device configuration diagram of a second terminal according to another embodiment of the present invention. The second terminal may be configured to receive the D2D communication signal sent by the first terminal according to the D2D resource allocated by the base station. The second terminal can include:

 The second resource receiving module 601 is configured to receive a target resource that is sent by the base station, where the target resource is that the base station receives the request sent by the first terminal to establish end-to-end D2D communication with the second terminal, Determining, among the D2D resources, a reusable resource multiplexable by the first terminal and the second terminal, and a resource allocated from the reusable resource;

 The signal quality of the discovery signal sent by the first terminal received by the terminal allocated to receive the D2D communication is less than a predetermined quality threshold, and the signal strength of the D2D communication signal received by the second terminal is less than A resource with a predetermined intensity threshold. The D2D resource can be a time-frequency resource.

 Specifically, the reusable resource needs to meet two conditions: first, the signal quality of the discovery signal sent by the first terminal received by the terminal that is allocated to receive the D2D communication is less than a predetermined quality threshold; Second, the signal strength of the D2D communication signal received by the second terminal according to the reusable resource is less than a predetermined intensity threshold. Wherein, satisfying the first condition indicates that when the first terminal transmits the D2D communication signal to the second terminal through the reusable resource, the terminal that receives the D2D communication signal using the reusable resource except the second terminal is not The second condition is met, indicating that the D2D communication signal sent by the terminal other than the first terminal using the reusable resource has no influence on the second terminal.

 The communication signal receiving module 602 is configured to receive the D2D communication signal sent by the first terminal according to the target resource.

 The second terminal further includes:

 The second instruction receiving module 603 is configured to receive, after the second resource receiving module 601 receives the target resource sent by the base station, a second instruction that is sent by the base station and includes the first resource, where the first resource is allocated to the third resource. The terminal is configured to receive the D2D resource of the D2D communication signal;

 The first monitoring module 604 is configured to monitor the D2D communication signal according to the first resource;

 The fifth detecting module 605 is configured to detect a signal strength of the D2D communication signal that is monitored according to the first resource, and obtain a first detection result;

 The second response sending module 606 is configured to send a second response to the base station according to the first detection result, where the second response is used to indicate whether a signal strength of the D2D communication signal monitored according to the first resource is less than a predetermined intensity threshold.

The detection sequence of the above two conditions may be set according to actual conditions, the base station may detect the first condition first, and then detect the second condition; the base station may also detect the second condition before detecting The first condition.

 When the first condition is detected first, and then the second condition is detected, the base station may send a first instruction to each terminal that has been allocated D2D resources for performing D2D communication by using the high layer signaling, after each D2D terminal receives the first instruction, Listening to the discovery signal Discovery signal sent by the first terminal on the predetermined time-frequency resource, and returning the first response to the base station according to the monitored discovery signal, and the base station determines, according to the first response, which terminals monitor the discovery sent by the first terminal. The signal quality of the signal is less than a predetermined quality threshold, and the D2D resource of the terminal allocated to the monitored signal of the first terminal transmitted by the monitored first terminal is determined to be the first resource. The base station sends a second indication including the first resource to the second terminal, and after receiving the second indication, the second terminal monitors the D2D communication signal sent by the other terminal through the second resource according to the second resource, and according to the monitoring As a result, the second response is returned to the base station, and the base station determines, according to the second response, that the resource whose signal strength of the D2D communication signal monitored by the second terminal is less than the predetermined signal strength threshold is a reusable resource.

 The second terminal further includes:

 The third instruction receiving module 607 is configured to receive, after the second resource receiving module 601 receives the target resource sent by the base station, a third instruction that is sent by the base station and includes the second resource, where the second resource is allocated to the fourth resource. a resource used by the terminal to receive the D2D communication signal;

 a second monitoring module 608, configured to monitor a D2D communication signal according to the second resource;

 a sixth detecting module 609, configured to detect a signal strength of the D2D communication signal that is monitored according to the second resource, to obtain a second detection result;

 The third response sending module 610 is configured to send a third response to the base station according to the second detection result, where the third response is used to indicate whether a signal strength of the D2D communication signal monitored according to the second resource is less than a predetermined intensity threshold.

When the second condition is detected, and the first condition is detected, the base station may send, by using the high layer signaling, the D2D resource that is currently allocated to the fourth terminal to receive the D2D communication signal as the second resource, to the second terminal. The terminal monitors the D2D communication signal according to the second resource sent by the base station, and returns a third response to the base station according to the monitoring result, and the base station determines, according to the third response, that the signal strength of the D2D communication signal received by the second terminal according to the second resource is less than a predetermined one. The fourth terminal sends a fourth command to the fourth terminal, and after receiving the command, the fourth terminal monitors the discovery signal sent by the first terminal on the predetermined resource, and returns a fourth response to the base station according to the monitoring result. The response determines that the fourth terminal monitors that the signal quality of the discovery signal sent by the first terminal is less than a predetermined quality threshold, and determines the second resource as a reusable resource that can be multiplexed by the first terminal and the second terminal. It should be noted that, in the response returned by the second terminal to the base station, the strength of the monitored D2D communication signal may be directly sent to the base station, and the base station detects whether the signal strength is less than a predetermined intensity threshold; or the second terminal may also detect Whether the signal strength is less than a predetermined intensity threshold, and the detection result is carried in the response and sent to the base station. In addition, the resources used by the second terminal to return the second response or the third response to the base station may be dynamically configured by the base station.

 In summary, the second terminal provided by the embodiment of the present invention can be reused by the receiving base station after determining the reusable resources that can be multiplexed by the first terminal and the second terminal in the allocated D2D resources. A target resource allocated in the resource, and receiving the D2D communication signal sent by the first base station according to the target resource, which solves the problem that in the prior art, when there are a large number of terminals requesting to establish D2D communication within the coverage of the base station, there may be no idle D2D resources. The problem of the situation that can be allocated to achieve the purpose of improving resource utilization and system capacity. Referring to FIG. 11, a device configuration diagram of a second terminal according to another embodiment of the present invention is shown. The second terminal may be configured to receive the D2D communication signal sent by the first terminal according to the D2D resource allocated by the base station. The second terminal may include: a receiver 013 and a processor 014;

 The receiver 013 is configured to receive a target resource that is sent by the base station, where the target resource is the D2D resource that has been allocated after the base station receives the request sent by the first terminal to establish end-to-end D2D communication with the second terminal. Determining, among the reusable resources that can be multiplexed by the first terminal and the second terminal, and resources allocated from the reusable resources;

 The processor 014 is configured to control the receiver 013 to receive the D2D communication signal sent by the first terminal according to the target resource.

In summary, the second terminal provided by the embodiment of the present invention can be reused by the receiving base station after determining the reusable resources that can be multiplexed by the first terminal and the second terminal in the allocated D2D resources. A target resource allocated in the resource, and receiving the D2D communication signal sent by the first base station according to the target resource, which solves the problem that in the prior art, when there are a large number of terminals requesting to establish D2D communication within the coverage of the base station, there may be no idle D2D resources. The problem of the situation that can be allocated to achieve the purpose of improving resource utilization and system capacity. Referring to FIG. 12, it shows a device configuration diagram of a second terminal according to still another embodiment of the present invention. The second terminal may be configured to receive the D2D communication signal sent by the first terminal according to the D2D resource allocated by the base station. The second terminal may include: a receiver 015 and a processor 016; The receiver 015 is configured to receive a target resource that is sent by the base station, where the target resource is the D2D resource that has been allocated after the base station receives the request sent by the first terminal to establish end-to-end D2D communication with the second terminal. Determining, among the reusable resources that can be multiplexed by the first terminal and the second terminal, and resources allocated from the reusable resources;

 The signal quality of the discovery signal sent by the first terminal received by the terminal allocated to receive the D2D communication is less than a predetermined quality threshold, and the signal strength of the D2D communication signal received by the second terminal is less than A resource with a predetermined intensity threshold. The D2D resource can be a time-frequency resource.

 Specifically, the reusable resource needs to meet two conditions: first, the signal quality of the discovery signal sent by the first terminal received by the terminal that is allocated to receive the D2D communication is less than a predetermined quality threshold; Second, the signal strength of the D2D communication signal received by the second terminal according to the reusable resource is less than a predetermined intensity threshold. Wherein, satisfying the first condition indicates that when the first terminal transmits the D2D communication signal to the second terminal through the reusable resource, the terminal that receives the D2D communication signal using the reusable resource except the second terminal is not The second condition is met, indicating that the D2D communication signal sent by the terminal other than the first terminal using the reusable resource has no influence on the second terminal.

 The processor 016 is configured to control the receiver 015 to receive the D2D communication signal sent by the first terminal according to the target resource.

 The second terminal further includes: a transmitter 017;

 The receiver 015 is further configured to: before receiving the target resource sent by the base station, receive a second command that is sent by the base station and includes the first resource, where the first resource is allocated to the third terminal for receiving the D2D communication signal. D2D resources;

 The processor 016 is configured to control the receiver 015 to monitor the D2D communication signal according to the first resource. The processor 016 is configured to detect a signal strength of the D2D communication signal that is monitored according to the first resource, to obtain a first detection result. ;

 The processor 016 is configured to control the transmitter 017 to send a second response to the base station according to the first detection result, where the second response is used to indicate whether a signal strength of the D2D communication signal monitored according to the first resource is less than a predetermined one. Intensity threshold.

 The detection sequence of the above two conditions may be set according to actual conditions, the base station may detect the first condition first, and then detect the second condition; the base station may also detect the second condition before detecting the first condition.

When the first condition is detected first, and then the second condition is detected, the base station can Each terminal that is allocated D2D resources for performing D2D communication sends a first instruction, and after receiving the first instruction, each D2D terminal monitors a discovery signal Discovery signal sent by the first terminal on a predetermined time-frequency resource, and according to the monitoring The discovery signal returns a first response to the base station, and the base station determines, according to the first response, which terminals the signal quality of the discovery signal sent by the first terminal is less than a predetermined quality threshold, and allocates the discovery to the monitored first terminal. The D2D resource of the terminal whose signal quality is less than the predetermined quality threshold is determined as the first resource. The base station sends a second indication including the first resource to the second terminal, and after receiving the second indication, the second terminal monitors the D2D communication signal sent by the other terminal through the second resource according to the second resource, and according to the monitoring As a result, the second response is returned to the base station, and the base station determines, according to the second response, that the resource whose signal strength of the D2D communication signal monitored by the second terminal is less than the predetermined signal strength threshold is a reusable resource.

 The receiver 015 is configured to: before receiving the target resource sent by the base station, receive a third command that is sent by the base station and includes a second resource, where the second resource is a resource that is allocated to the fourth terminal to receive the D2D communication signal. ;

 The processor 016 is configured to control the receiver 015 to monitor the D2D communication signal according to the second resource. The processor 016 is configured to detect a signal strength of the D2D communication signal that is monitored according to the second resource, to obtain a second detection result. ;

 The processor 016 is configured to control the transmitter 017 to send a third response to the base station according to the second detection result, where the third response is used to indicate whether a signal strength of the D2D communication signal monitored according to the second resource is less than a predetermined one. Intensity threshold.

 When the second condition is detected, and the first condition is detected, the base station may send, by using the high layer signaling, the D2D resource that is currently allocated to the fourth terminal to receive the D2D communication signal as the second resource, to the second terminal. The terminal monitors the D2D communication signal according to the second resource sent by the base station, and returns a third response to the base station according to the monitoring result, and the base station determines, according to the third response, that the signal strength of the D2D communication signal received by the second terminal according to the second resource is less than a predetermined one. The fourth terminal sends a fourth command to the fourth terminal, and after receiving the command, the fourth terminal monitors the discovery signal sent by the first terminal on the predetermined resource, and returns a fourth response to the base station according to the monitoring result. The response determines that the fourth terminal monitors that the signal quality of the discovery signal sent by the first terminal is less than a predetermined quality threshold, and determines the second resource as a reusable resource that can be multiplexed by the first terminal and the second terminal.

It should be noted that, in the response returned by the second terminal to the base station, the strength of the monitored D2D communication signal may be directly sent to the base station, and the base station detects whether the signal strength is less than a predetermined intensity threshold; or the second terminal may also detect Whether the signal strength is less than a predetermined intensity threshold, and the detection result is carried The band is sent to the base station in response. In addition, the resources used by the second terminal to return the second response or the third response to the base station may be dynamically configured by the base station.

 In summary, the second terminal provided by the embodiment of the present invention is already allocated by receiving the base station.

Determining, by the D2D resource, a target resource that is allocated from the reusable resource after being multiplexed by the first terminal and the second terminal, and receiving the D2D communication signal sent by the first base station according to the target resource, In the prior art, when there are a large number of terminals requesting to establish D2D communication within the coverage of the base station, there may be a problem that no idle D2D resources are available for allocation, and the purpose of improving resource utilization and system capacity is achieved. Referring to FIG. 13, which is a device configuration diagram of a third terminal according to an embodiment of the present invention, where the third terminal is a terminal that the base station has allocated D2D resources for D2D communication, and the third terminal is configured to receive at the base station. After the request sent by the first terminal to establish D2D communication with the second terminal, the assistance base station determines the reusable resource in the allocated D2D resource. The third terminal may include:

 The first instruction receiving module 701 is configured to receive a first instruction sent by the base station, where the first instruction is an instruction sent by the base station after receiving a request for establishing a D2D communication with the second terminal by the first terminal;

 a third monitoring module 702, configured to monitor a discovery signal sent by the first terminal;

 The seventh detecting module 703 is configured to detect a signal quality of the discovery signal that is monitored by the third monitoring module 702, and obtain a third detection result;

 The first response sending module 704 is configured to send a first response to the base station according to the third detection result; when the signal quality of the discovery signal that the base station indicates that the monitored signal is less than a predetermined quality threshold, the base station The second terminal sends a second command including the first resource, and receives the second response returned by the second terminal, and indicates, in the second response, the signal strength of the D2D communication signal that the second terminal monitors according to the first resource. When the threshold is less than the predetermined strength threshold, the first resource is determined as a reusable resource, the target resource is allocated from the reusable resource, and the target resource is sent to the first terminal and the second terminal, by the first Transmitting, by the terminal, a D2D communication signal according to the target resource, and receiving, by the second terminal, the D2D communication signal according to the target resource;

The first resource is a D2D resource that is allocated to the third terminal for receiving the D2D communication signal, and the second instruction is used to instruct the second terminal to monitor the D2D communication signal according to the first resource; And indicating whether the signal strength of the D2D communication signal monitored by the second terminal according to the first resource is less than the predetermined intensity threshold. In summary, the third terminal provided by the embodiment of the present invention listens to the discovery signal sent by the first terminal after receiving the first instruction sent by the base station, and returns a first response to the base station according to the monitoring result, where the base station is in the The first response indicates that the signal quality of the discovery signal of the first terminal received by the third terminal is less than the predetermined quality threshold, and sends a second instruction to the second terminal, and indicates that the second terminal is based on the second response returned by the second terminal. When the signal strength of the D2D communication signal that is received by the first resource that is received by the third terminal is less than the predetermined strength threshold, the first resource is determined to be a reusable resource, which solves the problem in the prior art when the base station is in coverage. When the number of terminals requesting to establish D2D communication is large, there may be a problem that no idle D2D resources are available for allocation, and the purpose of improving resource utilization and system capacity is achieved. Referring to FIG. 14, which is a device configuration diagram of a third terminal according to another embodiment of the present invention, where the third terminal is a terminal that the base station has allocated D2D resources for D2D communication, and the third terminal may be used in the base station. After receiving the request sent by the first terminal to establish D2D communication with the second terminal, the assistance base station determines the reusable resource in the allocated D2D resource. The third terminal may include:

 The first instruction receiving module 801 is configured to receive a first instruction sent by the base station, where the first instruction is an instruction sent by the base station after receiving a request sent by the first terminal for establishing D2D communication with the second terminal;

 a third monitoring module 802, configured to monitor a discovery signal sent by the first terminal;

 Specifically, the terminal supporting the D2D communication may periodically send the discovery signal Discovery signal on the predetermined time-frequency resource, when the first terminal receives the discovery signal sent by the second terminal and detects that the D2D communication can be performed with the second terminal. And the base station may send a request for D2D communication with the second terminal. After receiving the first instruction sent by the base station, the third terminal may monitor the discovery signal periodically sent by the first terminal.

 The seventh detecting module 803 is configured to detect a signal quality of the discovery signal that is monitored by the third monitoring module 802, and obtain a third detection result;

 The discovery signal sent by the first terminal may carry the reference content that is known in advance by each terminal. After receiving the discovery signal, the third terminal parses the discovery signal, and compares the content obtained by the analysis with the reference content to obtain an accurate analysis. Rate, and the resolution accuracy is taken as the signal quality of the received discovery signal transmitted by the first terminal.

The first response sending module 804 is configured to send a first response to the base station according to the third detection result; the signal quality of the discovery signal monitored by the base station in the first response is less than a predetermined quality threshold Transmitting, to the second terminal, a second instruction including the first resource, and receiving a second response returned by the second terminal, and indicating, in the second response, that the second terminal is monitored according to the first resource. When the signal strength of the D2D communication signal is less than the predetermined intensity threshold, the first resource is determined as a reusable resource, the target resource is allocated from the reusable resource, and the target resource is sent to the first terminal and the second a terminal, wherein the first terminal sends a D2D communication signal according to the target resource, and the second terminal receives the D2D communication signal according to the target resource;

 The first resource is a D2D resource that is allocated to the third terminal for receiving the D2D communication signal, and the second instruction is used to instruct the second terminal to monitor the D2D communication signal according to the first resource; And indicating whether the signal strength of the D2D communication signal monitored by the second terminal according to the first resource is less than the predetermined intensity threshold.

 The signal quality of the discovery signal sent by the first terminal received by the terminal allocated to receive the D2D communication is less than a predetermined quality threshold, and the signal strength of the D2D communication signal received by the second terminal is less than A resource with a predetermined intensity threshold. The D2D resource can be a time-frequency resource.

 Specifically, the reusable resource needs to meet two conditions: first, the signal quality of the discovery signal sent by the first terminal received by the terminal that is allocated to receive the D2D communication is less than a predetermined quality threshold; Second, the signal strength of the D2D communication signal received by the second terminal according to the reusable resource is less than a predetermined intensity threshold. Wherein, satisfying the first condition indicates that when the first terminal transmits the D2D communication signal to the second terminal through the reusable resource, the terminal that receives the D2D communication signal using the reusable resource except the second terminal is not The second condition is met, indicating that the D2D communication signal sent by the terminal other than the first terminal using the reusable resource has no influence on the second terminal.

The base station may send, by using the high layer signaling, the first instruction to each terminal that has been allocated the D2D resource for D2D communication, and after receiving the first instruction, each D2D terminal monitors the discovery signal sent by the first terminal on the predetermined time-frequency resource. The discovery signal returns a first response to the base station according to the monitored discovery signal, and the base station determines, according to the first response, which terminal monitors the signal quality of the discovery signal sent by the first terminal is less than a predetermined quality threshold, and allocates the sound to the monitoring. The D2D resource of the terminal whose signal quality of the discovery signal transmitted by the first terminal is less than the predetermined quality threshold is determined as the first resource. The base station sends a second indication including the first resource to the second terminal, and after receiving the second indication, the second terminal monitors the D2D communication signal sent by the other terminal through the second resource according to the second resource, and according to the monitoring As a result, the second response is returned to the base station, and the base station determines, according to the second response, that the resource whose signal strength of the D2D communication signal monitored by the second terminal is less than the predetermined signal strength threshold is reconfigurable. The first response sending module 804 is configured to send, to the base station, a first response frame that includes the first response, where the first response frame is sent according to the first resource after receiving the first command. D2D communication frames.

 When the terminal that has been allocated the D2D resource returns a response to the base station, the terminal may return a response to the base station by using the allocated resource for transmitting the D2D signal. For example, the response returned to the base station may be carried after receiving the first instruction. The first OFDM symbol in the first D2D communication frame sent. After transmitting the first instruction, the base station receives the first D2D communication frame sent according to the allocated D2D resource, and parses the first OFDM symbol in the received D2D communication frame to obtain the first response returned by each D2D terminal. .

 It should be noted that, in the response returned by the third terminal to the base station, the signal quality of the monitored discovery signal of the first terminal may be directly sent to the base station, and the base station detects whether the signal quality is less than a predetermined quality threshold; or, the third terminal It is also possible to first detect whether the signal quality is less than a predetermined quality threshold, and carry the detection result in the response and send it to the base station.

 In summary, the third terminal provided by the embodiment of the present invention listens to the discovery signal sent by the first terminal after receiving the first instruction sent by the base station, and returns a first response to the base station according to the monitoring result, where the base station is in the The first response indicates that the signal quality of the discovery signal of the first terminal received by the third terminal is less than the predetermined quality threshold, and sends a second instruction to the second terminal, and indicates that the second terminal is based on the second response returned by the second terminal. When the signal strength of the D2D communication signal that is received by the first resource that is received by the third terminal is less than the predetermined strength threshold, the first resource is determined to be a reusable resource, which solves the problem in the prior art when the base station is in coverage. When the number of terminals requesting to establish D2D communication is large, there may be a problem that no idle D2D resources are available for allocation, and the purpose of improving resource utilization and system capacity is achieved. Referring to FIG. 15, which is a device configuration diagram of a third terminal according to another embodiment of the present invention, where the third terminal is a terminal that the base station has allocated D2D resources for D2D communication, and the third terminal may be used in the base station. After receiving the request sent by the first terminal to establish D2D communication with the second terminal, the assistance base station determines the reusable resource in the allocated D2D resource. The third terminal may include: a receiver 018, a processor 019, and a transmitter 020;

The receiver 018 is configured to receive a first instruction sent by the base station, where the first instruction is an instruction sent by the base station after receiving a request for establishing a D2D communication with the second terminal by the first terminal; The processor 019 is configured to control the receiver 018 to monitor the discovery signal sent by the first terminal, and the processor 019 is configured to detect the monitored signal quality of the discovery signal to obtain a third detection result.

 The processor 019 is configured to control the transmitter 020 to send a first response to the base station according to the third detection result; when the signal quality of the discovery signal that the base station indicates that the first response indicates that the signal quality of the discovery signal is less than a predetermined quality threshold, Transmitting, to the second terminal, a second instruction including the first resource, and receiving a second response returned by the second terminal, and indicating, in the second response, the D2D communication signal that the second terminal monitors according to the first resource When the signal strength is less than the predetermined strength threshold, the first resource is determined as a reusable resource, the target resource is allocated from the reusable resource, and the target resource is sent to the first terminal and the second terminal, The first terminal sends a D2D communication signal according to the target resource, and the second terminal receives the D2D communication signal according to the target resource;

 The first resource is a D2D resource that is allocated to the third terminal for receiving the D2D communication signal, and the second instruction is used to instruct the second terminal to monitor the D2D communication signal according to the first resource; And indicating whether the signal strength of the D2D communication signal monitored by the second terminal according to the first resource is less than the predetermined intensity threshold.

 In summary, the third terminal provided by the embodiment of the present invention listens to the discovery signal sent by the first terminal after receiving the first instruction sent by the base station, and returns a first response to the base station according to the monitoring result, where the base station is in the The first response indicates that the signal quality of the discovery signal of the first terminal received by the third terminal is less than the predetermined quality threshold, and sends a second instruction to the second terminal, and indicates that the second terminal is based on the second response returned by the second terminal. When the signal strength of the D2D communication signal that is received by the first resource that is received by the third terminal is less than the predetermined strength threshold, the first resource is determined to be a reusable resource, which solves the problem in the prior art when the base station is in coverage. When the number of terminals requesting to establish D2D communication is large, there may be a problem that no idle D2D resources are available for allocation, and the purpose of improving resource utilization and system capacity is achieved. Referring to FIG. 16, which is a device configuration diagram of a third terminal according to another embodiment of the present invention, where the third terminal is a terminal that the base station has allocated D2D resources for D2D communication, and the third terminal may be used in the base station. After receiving the request sent by the first terminal to establish D2D communication with the second terminal, the assistance base station determines the reusable resource in the allocated D2D resource. The third terminal may include: a receiver 021, a processor 022, and a transmitter 023;

The receiver 021 is configured to receive a first instruction sent by the base station, where the first instruction is that the base station is connected Receiving an instruction sent by the first terminal to send a request for establishing a D2D communication with the second terminal; the processor 022, configured to control the receiver 021 to monitor the discovery signal sent by the first terminal; specifically, supporting the D2D The communication terminal may periodically send the discovery signal Discovery signal on the predetermined time-frequency resource. When the first terminal receives the discovery signal sent by the second terminal and detects that the second terminal can perform D2D communication, the terminal may send the signal to the base station. A request for D2D communication with the second terminal. After receiving the first instruction sent by the base station, the third terminal may monitor the discovery signal periodically sent by the first terminal.

 The processor 022 is configured to detect a signal quality of the detected discovery signal, and obtain a third detection result;

 The discovery signal sent by the first terminal may carry the reference content that is known in advance by each terminal. After receiving the discovery signal, the third terminal parses the discovery signal, and compares the content obtained by the analysis with the reference content to obtain an accurate analysis. Rate, and the resolution accuracy is taken as the signal quality of the received discovery signal transmitted by the first terminal.

 The processor 022 is configured to control the transmitter 023 to send a first response to the base station according to the third detection result; when the signal quality of the discovery signal that the base station indicates that the first response is detected by the base station is less than a predetermined quality threshold, Transmitting, to the second terminal, a second instruction including the first resource, and receiving a second response returned by the second terminal, and indicating, in the second response, the D2D communication signal that the second terminal monitors according to the first resource When the signal strength is less than the predetermined strength threshold, the first resource is determined as a reusable resource, the target resource is allocated from the reusable resource, and the target resource is sent to the first terminal and the second terminal, The first terminal sends a D2D communication signal according to the target resource, and the second terminal receives the D2D communication signal according to the target resource;

 The first resource is a D2D resource that is allocated to the third terminal for receiving the D2D communication signal, and the second instruction is used to instruct the second terminal to monitor the D2D communication signal according to the first resource; And indicating whether the signal strength of the D2D communication signal monitored by the second terminal according to the first resource is less than the predetermined intensity threshold.

 The signal quality of the discovery signal sent by the first terminal received by the terminal allocated to receive the D2D communication is less than a predetermined quality threshold, and the signal strength of the D2D communication signal received by the second terminal is less than A resource with a predetermined intensity threshold. The D2D resource can be a time-frequency resource.

Specifically, the reusable resource needs to meet two conditions: first, the signal quality of the discovery signal sent by the first terminal received by the terminal that is allocated to receive the D2D communication is less than a predetermined quality threshold; Second, the second terminal receives the D2D communication signal according to the reusable resource The intensity of the number is less than the predetermined intensity threshold. Wherein, satisfying the first condition indicates that when the first terminal transmits the D2D communication signal to the second terminal through the reusable resource, the terminal that receives the D2D communication signal using the reusable resource except the second terminal is not The second condition is met, indicating that the D2D communication signal sent by the terminal other than the first terminal using the reusable resource has no influence on the second terminal.

 The base station may send, by using the high layer signaling, the first instruction to each terminal that has been allocated the D2D resource for D2D communication, and after receiving the first instruction, each D2D terminal monitors the discovery signal sent by the first terminal on the predetermined time-frequency resource. The discovery signal returns a first response to the base station according to the monitored discovery signal, and the base station determines, according to the first response, which terminal monitors the signal quality of the discovery signal sent by the first terminal is less than a predetermined quality threshold, and allocates the sound to the monitoring. The D2D resource of the terminal whose signal quality of the discovery signal transmitted by the first terminal is less than the predetermined quality threshold is determined as the first resource. The base station sends a second indication including the first resource to the second terminal, and after receiving the second indication, the second terminal monitors the D2D communication signal sent by the other terminal through the second resource according to the second resource, and according to the monitoring As a result, the second response is returned to the base station, and the base station determines, according to the second response, that the resource whose signal strength of the D2D communication signal monitored by the second terminal is less than the predetermined signal strength threshold is a reusable resource.

 The processor 022 is configured to control the transmitter 023 to send, to the base station, a first response frame that includes the first response, where the first response frame is sent according to the first resource after receiving the first command. The first D2D communication frame.

 When the terminal that has been allocated the D2D resource returns a response to the base station, the terminal may return a response to the base station by using the allocated resource for transmitting the D2D signal. For example, the response returned to the base station may be carried after receiving the first instruction. The first OFDM symbol in the first D2D communication frame sent. After transmitting the first instruction, the base station receives the first D2D communication frame sent according to the allocated D2D resource, and parses the first OFDM symbol in the received D2D communication frame to obtain the first response returned by each D2D terminal. .

 It should be noted that, in the response returned by the third terminal to the base station, the signal quality of the monitored discovery signal of the first terminal may be directly sent to the base station, and the base station detects whether the signal quality is less than a predetermined quality threshold; or, the third terminal It is also possible to first detect whether the signal quality is less than a predetermined quality threshold, and carry the detection result in the response and send it to the base station.

In summary, the third terminal provided by the embodiment of the present invention listens to the discovery signal sent by the first terminal after receiving the first instruction sent by the base station, and returns a first response to the base station according to the monitoring result. After the first response indicates that the signal quality of the discovery signal of the first terminal received by the third terminal is less than a predetermined quality threshold, the base station sends a second instruction to the second terminal, and indicates the second response returned according to the second terminal. The second terminal determines the first resource as a reusable resource according to the signal strength of the D2D communication signal that is monitored by the first resource that is used by the third terminal to receive the D2D communication signal, and solves the problem in the prior art. When there are a large number of terminals requesting to establish D2D communication within the coverage of the base station, there may be a problem that no idle D2D resources are available for allocation, and the purpose of improving resource utilization and system capacity is achieved. Referring to FIG. 17, which is a device configuration diagram of a fourth terminal according to an embodiment of the present invention, where the fourth terminal is a terminal that the base station has allocated D2D resources for D2D communication, and the fourth terminal is configured to receive at the base station. After the request sent by the first terminal to establish D2D communication with the second terminal, the assistance base station determines the reusable resource in the allocated D2D resource. The fourth terminal may include:

 The fourth instruction receiving module 901 is configured to receive a fourth command sent by the base station, where the fourth command is that the base station sends a request for establishing D2D communication with the second terminal by the first terminal, and sends the request to the second terminal. And a third command including the second resource, receiving the third response returned by the second terminal, and indicating, in the third response, that the signal strength of the D2D communication signal that the second terminal monitors according to the second resource is less than a predetermined intensity threshold The second resource is a resource that has been allocated to the fourth terminal for receiving the D2D communication signal, and the third instruction is used to instruct the second terminal to monitor the D2D communication signal according to the second resource, the third Responsive to indicating whether a signal strength of the D2D communication signal monitored by the second terminal according to the second resource is less than the predetermined intensity threshold;

 a fourth monitoring module 902, configured to monitor a discovery signal sent by the first terminal;

 The eighth detecting module 903 is configured to detect the signal quality of the detected discovery signal, and obtain a fourth detection result;

 The fourth response sending module 904 is configured to send a fourth response to the base station according to the fourth detection result, where the fourth response is used to indicate whether the monitored signal quality of the discovery signal is less than a predetermined quality threshold; When the fourth response indicates that the monitored signal quality of the discovery signal is less than the predetermined quality threshold, determining the second resource as a reusable resource, allocating the target resource from the reusable resource, and sending the target resource to The first terminal and the second terminal, the first terminal sends a D2D communication signal according to the target resource, and the second terminal receives the D2D communication signal according to the target resource.

In summary, the fourth terminal provided by the embodiment of the present invention transmits, by the receiving base station, a third instruction including the second resource to the second terminal, and according to the third response indication returned by the received second terminal. After detecting the fourth command sent when the signal strength of the D2D communication signal monitored by the second resource is less than the predetermined intensity threshold, the second terminal detects the signal quality of the detected discovery signal sent by the first terminal, and returns to the base station according to the detection result. The fourth response is determined by the base station as the reusable resource when the signal quality of the discovery signal sent by the first terminal that is detected by the fourth terminal in the fourth response is less than the predetermined quality threshold, and the prior art is When the number of terminals requesting D2D communication within the coverage of the base station is large, there may be a problem that no idle D2D resources are available for allocation, thereby achieving the purpose of improving resource utilization and system capacity. Referring to FIG. 18, it is a device configuration diagram of a fourth terminal according to another embodiment of the present invention. The fourth terminal is a terminal that the base station has allocated D2D resources for D2D communication, and the fourth terminal may be used in the base station. After receiving the request sent by the first terminal to establish D2D communication with the second terminal, the assistance base station determines the reusable resource in the allocated D2D resource. The fourth terminal may include:

 The fourth instruction receiving module 1001 is configured to receive a fourth instruction sent by the base station, where the fourth instruction is that the base station sends a request for establishing a D2D communication with the second terminal by the first terminal, and sends the request to the second terminal. And a third command including the second resource, receiving the third response returned by the second terminal, and indicating, in the third response, that the signal strength of the D2D communication signal that the second terminal monitors according to the second resource is less than a predetermined intensity threshold The second resource is a resource that has been allocated to the fourth terminal for receiving the D2D communication signal, and the third instruction is used to instruct the second terminal to monitor the D2D communication signal according to the second resource, the third Responsive to indicating whether a signal strength of the D2D communication signal monitored by the second terminal according to the second resource is less than the predetermined intensity threshold;

 The signal quality of the discovery signal sent by the first terminal received by the terminal allocated to receive the D2D communication is less than a predetermined quality threshold, and the signal strength of the D2D communication signal received by the second terminal is less than A resource with a predetermined intensity threshold. The D2D resource can be a time-frequency resource.

Specifically, the reusable resource needs to meet two conditions: first, the signal quality of the discovery signal sent by the first terminal received by the terminal that is allocated to receive the D2D communication is less than a predetermined quality threshold; Second, the signal strength of the D2D communication signal received by the second terminal according to the reusable resource is less than a predetermined intensity threshold. Wherein, satisfying the first condition indicates that when the first terminal transmits the D2D communication signal to the second terminal through the reusable resource, the terminal that receives the D2D communication signal using the reusable resource except the second terminal is not The second condition is met, indicating that the D2D communication signal sent by the terminal other than the first terminal using the reusable resource has no influence on the second terminal. The fourth monitoring module 1002 is configured to monitor the discovery signal sent by the first terminal, and the eighth detection module 1003 is configured to detect the signal quality of the detected discovery signal, and obtain a fourth detection result;

 The method for the fourth terminal to listen to the discovery signal sent by the first terminal and detect the signal quality of the discovery signal is similar to that of the third terminal, and details are not described herein again.

 The fourth response sending module 1004 is configured to send a fourth response to the base station according to the fourth detection result, where the fourth response is used to indicate whether the monitored signal quality of the discovery signal is less than a predetermined quality threshold; When the fourth response indicates that the monitored signal quality of the discovery signal is less than the predetermined quality threshold, determining the second resource as a reusable resource, allocating the target resource from the reusable resource, and sending the target resource to The first terminal and the second terminal, the first terminal sends a D2D communication signal according to the target resource, and the second terminal receives the D2D communication signal according to the target resource.

 The base station may send, by using the high layer signaling, the D2D resource that is currently allocated to the fourth terminal to receive the D2D communication signal to the second terminal, and the second terminal monitors the D2D communication signal according to the second resource sent by the base station, and according to The monitoring result returns a third response to the base station, and when the base station determines, according to the third response, that the signal strength of the D2D communication signal received by the second terminal according to the second resource is less than a predetermined intensity threshold, the fourth command is sent to the fourth terminal, and the fourth After receiving the instruction, the terminal monitors the discovery signal sent by the first terminal on the predetermined resource, and returns a fourth response to the base station according to the monitoring result, where the fourth response indicates that the fourth terminal monitors the discovery signal sent by the first terminal. When the signal quality is less than the predetermined quality threshold, the second resource is determined to be a reusable resource that can be multiplexed by the first terminal and the second terminal.

 The fourth response sending module 1004 is configured to send, to the base station, a second response frame that includes the fourth response, where the second response frame is sent according to the second resource after receiving the fourth command. A D2D communication frame.

 When the terminal that has been allocated the D2D resource returns a response to the base station, the terminal may return a response to the base station by using the allocated resource for transmitting the D2D signal. For example, the response returned to the base station may be carried after receiving the fourth instruction. The first OFDM symbol in the first D2D communication frame sent. After transmitting the fourth instruction, the base station receives the first D2D communication frame sent according to the allocated D2D resource, and parses the first OFDM symbol in the received D2D communication frame to obtain the fourth response returned by each D2D terminal. .

It should be noted that, in the response returned by the fourth terminal to the base station, the signal quality of the monitored discovery signal of the first terminal may be directly sent to the base station, and the base station detects whether the signal quality is less than the predetermined quality. The threshold may be used to detect whether the signal quality is less than a predetermined quality threshold, and the detection result is carried in the response and sent to the base station.

 In summary, the fourth terminal provided by the embodiment of the present invention, by the receiving base station, sends a third instruction including the second resource to the second terminal, and indicates the second terminal according to the received third response returned by the second terminal. After detecting the fourth command sent when the signal strength of the D2D communication signal monitored by the second resource is less than the predetermined intensity threshold, detecting the signal quality of the detected discovery signal sent by the first terminal, and returning the fourth response to the base station according to the detection result. And determining, by the base station, the second resource as the reusable resource when the signal quality of the discovery signal sent by the first terminal that is monitored by the fourth terminal is lower than the predetermined quality threshold, and solving the problem of the base station coverage in the prior art. When the number of terminals requesting to establish D2D communication is large, there may be a problem that no idle D2D resources are available for allocation, and the purpose of improving resource utilization and system capacity is achieved. Referring to FIG. 19, it is a device configuration diagram of a fourth terminal according to another embodiment of the present invention. The fourth terminal is a terminal that the base station has allocated D2D resources for D2D communication, and the fourth terminal may be used in the base station. After receiving the request sent by the first terminal to establish D2D communication with the second terminal, the assistance base station determines the reusable resource in the allocated D2D resource. The fourth terminal may include: a receiver 024, a processor 025, and a transmitter 026;

 The receiver 024 is configured to receive a fourth command sent by the base station, where the fourth command is sent by the base station to receive a request for establishing a D2D communication with the second terminal, and send the a third instruction of the second resource, receiving a third response returned by the second terminal, and sending, when the third response indicates that the signal strength of the D2D communication signal monitored by the second terminal according to the second resource is less than a predetermined intensity threshold The second resource is a resource that has been allocated to the fourth terminal for receiving the D2D communication signal, and the third instruction is used to instruct the second terminal to monitor the D2D communication signal according to the second resource, where the third response is used. And indicating whether the signal strength of the D2D communication signal monitored by the second terminal according to the second resource is less than the predetermined intensity threshold;

 The processor 025 is configured to control the receiver 024 to monitor the discovery signal sent by the first terminal. The processor 025 is configured to detect the signal quality of the detected discovery signal, and obtain a fourth detection result.

The processor 025 is configured to control the transmitter 026 to send a fourth response to the base station according to the fourth detection result; the fourth response is used to indicate whether the monitored signal quality of the discovery signal is less than a predetermined quality threshold; The signal quality of the discovery signal monitored by the base station in the fourth response indication is less than the Determining, by the first terminal, the second resource, the second resource is determined as a reusable resource, the target resource is allocated from the reusable resource, and the target resource is sent to the first terminal and the second terminal, by the first terminal Transmitting a D2D communication signal according to the target resource, and receiving, by the second terminal, the D2D communication signal according to the target resource.

 In summary, the fourth terminal provided by the embodiment of the present invention, by the receiving base station, sends a third instruction including the second resource to the second terminal, and indicates the second terminal according to the received third response returned by the second terminal. After detecting the fourth command sent when the signal strength of the D2D communication signal monitored by the second resource is less than the predetermined intensity threshold, detecting the signal quality of the detected discovery signal sent by the first terminal, and returning the fourth response to the base station according to the detection result. And determining, by the base station, the second resource as the reusable resource when the signal quality of the discovery signal sent by the first terminal that is monitored by the fourth terminal is lower than the predetermined quality threshold, and solving the problem of the base station coverage in the prior art. When the number of terminals requesting to establish D2D communication is large, there may be a problem that no idle D2D resources are available for allocation, and the purpose of improving resource utilization and system capacity is achieved. Referring to FIG. 20, it is a device configuration diagram of a fourth terminal according to another embodiment of the present invention. The fourth terminal is a terminal that the base station has allocated D2D resources for D2D communication, and the fourth terminal may be used in the base station. After receiving the request sent by the first terminal to establish D2D communication with the second terminal, the assistance base station determines the reusable resource in the allocated D2D resource. The fourth terminal may include: a receiver 027, a processor 028, and a transmitter 029;

 The receiver 027 is configured to receive a fourth command sent by the base station, where the fourth command is sent by the base station to receive a request for establishing a D2D communication with the second terminal, and send the a third instruction of the second resource, receiving a third response returned by the second terminal, and sending, when the third response indicates that the signal strength of the D2D communication signal monitored by the second terminal according to the second resource is less than a predetermined intensity threshold The second resource is a resource that has been allocated to the fourth terminal for receiving the D2D communication signal, and the third instruction is used to instruct the second terminal to monitor the D2D communication signal according to the second resource, where the third response is used. And indicating whether the signal strength of the D2D communication signal monitored by the second terminal according to the second resource is less than the predetermined intensity threshold;

 The signal quality of the discovery signal sent by the first terminal received by the terminal allocated to receive the D2D communication is less than a predetermined quality threshold, and the signal strength of the D2D communication signal received by the second terminal is less than A resource with a predetermined intensity threshold. The D2D resource can be a time-frequency resource.

Specifically, the reusable resource needs to meet two conditions: First, the reusable resource is allocated. The signal quality of the discovery signal sent by the first terminal received by the terminal receiving the D2D communication is less than a predetermined quality threshold. Second, the signal strength of the D2D communication signal received by the second terminal according to the reusable resource is less than a predetermined intensity threshold. Wherein, satisfying the first condition indicates that when the first terminal transmits the D2D communication signal to the second terminal through the reusable resource, the terminal that receives the D2D communication signal using the reusable resource except the second terminal is not The second condition is met, indicating that the D2D communication signal sent by the terminal other than the first terminal using the reusable resource has no influence on the second terminal.

 The processor 028 is configured to control the receiver 027 to monitor the discovery signal sent by the first terminal; the processor 028 is configured to detect the signal quality of the detected discovery signal, and obtain a fourth detection result;

 The processor 028 is configured to control the transmitter 029 to send a fourth response to the base station according to the fourth detection result; the fourth response is used to indicate whether the monitored signal quality of the discovery signal is less than a predetermined quality threshold; When the fourth response indicates that the signal quality of the detected signal is less than the predetermined quality threshold, the base station determines the second resource as a reusable resource, allocates a target resource from the reusable resource, and uses the target The resource is sent to the first terminal and the second terminal, and the first terminal sends a D2D communication signal according to the target resource, and the second terminal receives the D2D communication signal according to the target resource.

 The base station may send, by using the high layer signaling, the D2D resource that is currently allocated to the fourth terminal to receive the D2D communication signal to the second terminal, and the second terminal monitors the D2D communication signal according to the second resource sent by the base station, and according to The monitoring result returns a third response to the base station, and when the base station determines, according to the third response, that the signal strength of the D2D communication signal received by the second terminal according to the second resource is less than a predetermined intensity threshold, the fourth command is sent to the fourth terminal, and the fourth After receiving the instruction, the terminal monitors the discovery signal sent by the first terminal on the predetermined resource, and returns a fourth response to the base station according to the monitoring result, where the fourth response indicates that the fourth terminal monitors the discovery signal sent by the first terminal. When the signal quality is less than the predetermined quality threshold, the second resource is determined to be a reusable resource that can be multiplexed by the first terminal and the second terminal.

 The processor 028 is configured to control the transmitter 029 to send, to the base station, a second response frame that includes the fourth response, where the second response frame is sent according to the second resource after receiving the fourth instruction. The first D2D communication frame.

When the terminal that has allocated the D2D resource returns a response to the base station, the terminal may return a response to the base station by using the allocated resource for transmitting the D2D signal, for example, the response that may be returned to the base station. Carrying in the first OFDM symbol in the first D2D communication frame sent after receiving the fourth instruction. After transmitting the fourth instruction, the base station receives the first D2D communication frame sent according to the allocated D2D resource, and parses the first OFDM symbol in the received D2D communication frame to obtain the fourth response returned by each D2D terminal. .

 It should be noted that, in the response returned by the fourth terminal to the base station, the signal quality of the detected first terminal's discovery signal may be directly sent to the base station, and the base station detects whether the signal quality is less than a predetermined quality threshold; or, the fourth terminal It is also possible to first detect whether the signal quality is less than a predetermined quality threshold, and carry the detection result in the response and send it to the base station.

 In summary, the fourth terminal provided by the embodiment of the present invention, by the receiving base station, sends a third instruction including the second resource to the second terminal, and indicates the second terminal according to the received third response returned by the second terminal. After detecting the fourth command sent when the signal strength of the D2D communication signal monitored by the second resource is less than the predetermined intensity threshold, detecting the signal quality of the detected discovery signal sent by the first terminal, and returning the fourth response to the base station according to the detection result. And determining, by the base station, the second resource as the reusable resource when the signal quality of the discovery signal sent by the first terminal that is monitored by the fourth terminal is lower than the predetermined quality threshold, and solving the problem of the base station coverage in the prior art. When the number of terminals requesting to establish D2D communication is large, there may be a problem that no idle D2D resources are available for allocation, and the purpose of improving resource utilization and system capacity is achieved. Referring to FIG. 21, a flow chart of a method for resource allocation according to an embodiment of the present invention is shown. The method can be used to allocate D2D resources for terminals requesting D2D communication in a base station as shown in any of Figures 1 to 4. The resource allocation method can include:

 Step 1101: Receive a request sent by the first terminal to establish end-to-end D2D communication with the second terminal.

 Step 1102: Determine, among the allocated D2D resources, a reusable resource that can be multiplexed by the first terminal and the second terminal.

 The reusable resource is a signal that the signal quality of the discovery signal sent by the first terminal that is received by the terminal that is allocated to receive the D2D communication is less than a predetermined quality threshold, and the second terminal receives the received D2D communication signal. A resource whose strength is less than a predetermined intensity threshold. The D2D resource can be a time-frequency resource.

 Step 1103: Allocate a target resource from the reusable resource.

Step 1104: Send the target resource to the first terminal and the second terminal, by using the first terminal. Transmitting a D2D communication signal according to the target resource, and receiving, by the second terminal, the D2D communication signal according to the target resource.

 In summary, the resource allocation method provided by the embodiment of the present invention determines the first terminal in the already allocated D2D resource after receiving the request for establishing end-to-end D2D communication with the second terminal, which is sent by the first terminal. The resource that can be multiplexed with the second terminal, and the target resource is allocated from the reusable resource, which solves the problem that in the prior art, when there are a large number of terminals requesting to establish D2D communication within the coverage of the base station, there may be no idle D2D resources. The problem of the situation for distribution, to achieve the purpose of improving resource utilization and system capacity. Referring to FIG. 22, a flow chart of a method for resource allocation according to another embodiment of the present invention is shown. The method can be used to allocate, in a base station as shown in any of Figures 1 to 4, a D2D resource for transmitting a D2D communication signal to a second terminal for a first terminal requesting D2D communication. The resource allocation method can include:

 Step 1201: Receive a request sent by the first terminal to establish end-to-end D2D communication with the second terminal.

 The terminal supporting the D2D communication may periodically send the discovery signal Discovery signal on the predetermined time-frequency resource. When the first terminal receives the discovery signal sent by the second terminal and detects that the second terminal can perform D2D communication, the terminal may The base station transmits a request for D2D communication with the second terminal.

 Step 1202: Determine, in the already allocated D2D resources, a reusable resource that can be multiplexed by the first terminal and the second terminal.

 The reusable resource is a signal that the signal quality of the discovery signal sent by the first terminal that is received by the terminal that is allocated to receive the D2D communication is less than a predetermined quality threshold, and the second terminal receives the received D2D communication signal. A resource whose strength is less than a predetermined intensity threshold. The D2D resource can be a time-frequency resource.

Specifically, the reusable resource needs to meet two conditions: first, the signal quality of the discovery signal sent by the first terminal received by the terminal that is allocated to receive the D2D communication is less than a predetermined quality threshold; Second, the signal strength of the D2D communication signal received by the second terminal according to the reusable resource is less than a predetermined intensity threshold. Wherein, satisfying the first condition indicates that when the first terminal transmits the D2D communication signal to the second terminal through the reusable resource, the terminal that receives the D2D communication signal using the reusable resource except the second terminal is not Will have an effect; meet the second condition to indicate that A D2D communication signal transmitted by another terminal other than a terminal using the reusable resource does not affect the second terminal.

 The discovery signal sent by the first terminal may carry the reference content known in advance by each terminal. After receiving the discovery signal, each D2D terminal parses the discovery signal, and compares the content obtained by the analysis with the reference content to obtain an accurate analysis. Rate, and the resolution accuracy is taken as the signal quality of the received discovery signal transmitted by the first terminal.

 The discovery signal sent by the first terminal may be interfered by the discovery signal sent by other terminals. The receiving end receives the mixed signal of the discovery signal and the interference signal sent by the first terminal. If based on the signal strength, the receiving end can only measure the strength of the mixed signal, and cannot represent the signal of the first terminal. Intensity, therefore, the embodiment of the present invention sets the determination threshold according to the signal quality of the discovery signal of the first terminal, and can improve the accuracy of the determination.

 When the second terminal detects the interference of the signal received according to the allocated D2D resource, it needs to detect the total interference on a certain time-frequency resource, and does not need to distinguish which D2D terminal the interference comes from, therefore, only need to detect The signal strength of the communication signal received according to the allocated D2D resource may be used.

 The detection order of the above two conditions may be set according to actual conditions, and the first condition may be detected first, and then the second condition may be detected; or the second condition may be detected first, and then the first condition is detected.

 When the first condition is detected first, and then the second condition is detected, the base station may send a first instruction to each terminal that has been allocated D2D resources for performing D2D communication by using the high layer signaling, after each D2D terminal receives the first instruction, Listening to the discovery signal Discovery signal sent by the first terminal on the predetermined time-frequency resource, and returning the first response to the base station according to the monitored discovery signal, and the base station determines, according to the first response, which terminals monitor the discovery sent by the first terminal. The signal quality of the signal is less than a predetermined quality threshold, and the D2D resource of the terminal allocated to the monitored signal of the first terminal transmitted by the monitored first terminal is determined to be the first resource. The base station sends a second indication including the first resource to the second terminal, and after receiving the second indication, the second terminal monitors the D2D communication signal sent by the other terminal through the second resource according to the second resource, and according to the monitoring As a result, the second response is returned to the base station, and the base station determines, according to the second response, that the resource whose signal strength of the D2D communication signal monitored by the second terminal is less than the predetermined signal strength threshold is a reusable resource.

It should be noted that, in the response returned by the D2D terminal or the second terminal to the base station, the strength of the monitored D2D communication signal or the signal quality of the discovery signal of the first terminal may be directly sent to the base. a station, the base station detects whether the signal strength is less than a predetermined intensity threshold or whether the signal quality is less than a predetermined quality threshold; or the D2D terminal or the second terminal may first detect whether the signal strength is less than a predetermined intensity threshold or whether the signal quality is less than a predetermined quality threshold, and The detection result is carried in the response and sent to the base station.

 When the second condition is detected, and the first condition is detected, the base station may send, by using the high layer signaling, the D2D resource that is currently allocated to the fourth terminal to receive the D2D communication signal as the second resource, to the second terminal. The terminal monitors the D2D communication signal according to the second resource sent by the base station, and returns a third response to the base station according to the monitoring result, and the base station determines, according to the third response, that the signal strength of the D2D communication signal received by the second terminal according to the second resource is less than a predetermined one. The fourth terminal sends a fourth command to the fourth terminal, and after receiving the command, the fourth terminal monitors the discovery signal sent by the first terminal on the predetermined resource, and returns a fourth response to the base station according to the monitoring result. The response determines that the fourth terminal monitors that the signal quality of the discovery signal sent by the first terminal is less than a predetermined quality threshold, and determines the second resource as a reusable resource that can be multiplexed by the first terminal and the second terminal.

 When the terminal that has been allocated the D2D resource returns a response to the base station, the terminal may return a response to the base station by using the allocated resource for transmitting the D2D signal. For example, the response returned to the base station may be carried by receiving the first instruction or The first OFDM symbol in the first D2D communication frame transmitted after the fourth instruction. After transmitting the first instruction or the fourth instruction, the base station receives the first D2D communication frame sent according to the allocated D2D resource, and parses the first OFDM symbol in the received D2D communication frame to obtain the return of each D2D terminal. The first response or the fourth response.

 In addition, it should be noted that the resources used by the second terminal to return the second response or the third response to the base station may be dynamically configured by the base station.

 Step 1203: Allocate a target resource from the reusable resource.

 The base station can allocate some or all of the resources from all eligible reusable resources as target resources.

 Step 1204, detecting whether the target resource is sufficient; if yes, proceeding to step 1207, otherwise, proceeding to step 1205;

 Step 1205, detecting whether there is an idle D2D resource; if yes, proceeding to step 1206, no, and proceeding to step 1207;

 Step 1206, allocating target resources from idle D2D resources;

The base station can allocate part or all resources from the idle D2D resources as the target resources according to the actual situation. When allocating D2D resources, the base station may consider multiplexing the allocated D2D resources first, and then allocating the idle D2D resources when there is no D2D resources available for multiplexing.

 For example, after the base station allocates the target resource from the reusable resources, it can detect whether the target resource is sufficient. If sufficient, the idle D2D resource is no longer allocated. Otherwise, the target resource is further allocated from the idle D2D resource.

 Step 1207: The target resource is sent to the first terminal and the second terminal, and the first terminal sends a D2D communication signal according to the target resource, and the second terminal receives the D2D communication signal according to the target resource.

 In summary, the resource allocation method provided by the embodiment of the present invention determines the first terminal in the already allocated D2D resource after receiving the request for establishing end-to-end D2D communication with the second terminal, which is sent by the first terminal. The resource that can be multiplexed with the second terminal, and the target resource is allocated from the reusable resource, which solves the problem that in the prior art, when there are a large number of terminals requesting to establish D2D communication within the coverage of the base station, there may be no idle D2D resources. The problem of the situation for distribution, to achieve the purpose of improving resource utilization and system capacity. Referring to FIG. 23, a flow chart of a method for resource allocation according to another embodiment of the present invention is shown. The method can be used to allocate, in a base station as shown in any of Figures 1 to 4, a D2D resource for transmitting a D2D communication signal to a second terminal for a first terminal requesting D2D communication. The resource allocation method can include:

 Step 1301: Receive a request sent by the first terminal to establish end-to-end D2D communication with the second terminal.

 The terminal supporting the D2D communication may periodically send the discovery signal Discovery signal on the predetermined time-frequency resource. When the first terminal receives the discovery signal sent by the second terminal and detects that the second terminal can perform D2D communication, the terminal may The base station transmits a request for D2D communication with the second terminal.

 Step 1302, detecting whether there is an idle D2D resource; if yes, proceeding to step 1303, no, and proceeding to step 1305;

 Step 1303: Allocate a target resource from an idle D2D resource.

 The base station can allocate some resources or all resources as the target resources from the idle D2D resources according to the actual situation.

Step 1304, detecting whether the target resource is sufficient; if yes, proceeding to step 1307, otherwise, entering Step 1305;

 Step 1305: Determine, among the allocated D2D resources, a reusable resource that can be multiplexed by the first terminal and the second terminal.

 The reusable resource is a signal that the signal quality of the discovery signal sent by the first terminal that is received by the terminal that is allocated to receive the D2D communication is less than a predetermined quality threshold, and the second terminal receives the received D2D communication signal. A resource whose strength is less than a predetermined intensity threshold. The D2D resource can be a time-frequency resource.

 Specifically, the reusable resource needs to meet two conditions: first, the signal quality of the discovery signal sent by the first terminal received by the terminal that is allocated to receive the D2D communication is less than a predetermined quality threshold; Second, the signal strength of the D2D communication signal received by the second terminal according to the reusable resource is less than a predetermined intensity threshold. Wherein, satisfying the first condition indicates that when the first terminal transmits the D2D communication signal to the second terminal through the reusable resource, the terminal that receives the D2D communication signal using the reusable resource except the second terminal is not The second condition is met, indicating that the D2D communication signal sent by the terminal other than the first terminal using the reusable resource has no influence on the second terminal.

 The discovery signal sent by the first terminal may carry the reference content known in advance by each terminal. After receiving the discovery signal, each D2D terminal parses the discovery signal, and compares the content obtained by the analysis with the reference content to obtain an accurate analysis. Rate, and the resolution accuracy is taken as the signal quality of the received discovery signal transmitted by the first terminal.

 The discovery signal sent by the first terminal may be interfered by the discovery signal sent by other terminals. The receiving end receives the mixed signal of the discovery signal and the interference signal sent by the first terminal. If based on the signal strength, the receiving end can only measure the strength of the mixed signal, and cannot represent the signal of the first terminal. Intensity, therefore, the embodiment of the present invention sets the determination threshold according to the signal quality of the discovery signal of the first terminal, and can improve the accuracy of the determination.

 When the second terminal detects the interference of the signal received according to the allocated D2D resource, it needs to detect the total interference on a certain time-frequency resource, and does not need to distinguish which D2D terminal the interference comes from, therefore, only need to detect The signal strength of the communication signal received according to the allocated D2D resource may be used.

The detection order of the above two conditions may be set according to actual conditions, and the first condition may be detected first, and then the second condition may be detected; or the second condition may be detected first, and then the first condition is detected. When the first condition is detected first, and then the second condition is detected, the base station may send a first instruction to each terminal that has been allocated D2D resources for performing D2D communication by using the high layer signaling, after each D2D terminal receives the first instruction, Listening to the discovery signal Discovery signal sent by the first terminal on the predetermined time-frequency resource, and returning the first response to the base station according to the monitored discovery signal, and the base station determines, according to the first response, which terminals monitor the discovery sent by the first terminal. The signal quality of the signal is less than a predetermined quality threshold, and the D2D resource of the terminal allocated to the monitored signal of the first terminal transmitted by the monitored first terminal is determined to be the first resource. The base station sends a second indication including the first resource to the second terminal, and after receiving the second indication, the second terminal monitors the D2D communication signal sent by the other terminal through the second resource according to the second resource, and according to the monitoring As a result, the second response is returned to the base station, and the base station determines, according to the second response, that the resource whose signal strength of the D2D communication signal monitored by the second terminal is less than the predetermined signal strength threshold is a reusable resource.

 It should be noted that, in the response returned by the D2D terminal or the second terminal to the base station, the strength of the monitored D2D communication signal or the signal quality of the discovery signal of the first terminal may be directly sent to the base station, and the base station detects whether the signal strength is less than Whether the predetermined intensity threshold or the signal quality is less than the predetermined quality threshold; or the D2D terminal or the second terminal may first detect whether the signal strength is less than a predetermined intensity threshold or whether the signal quality is less than a predetermined quality threshold, and the detection result is carried in the response and sent to the response Base station.

 When the second condition is detected, and the first condition is detected, the base station may send, by using the high layer signaling, the D2D resource that is currently allocated to the fourth terminal to receive the D2D communication signal as the second resource, to the second terminal. The terminal monitors the D2D communication signal according to the second resource sent by the base station, and returns a third response to the base station according to the monitoring result, and the base station determines, according to the third response, that the signal strength of the D2D communication signal received by the second terminal according to the second resource is less than a predetermined one. The fourth terminal sends a fourth command to the fourth terminal, and after receiving the command, the fourth terminal monitors the discovery signal sent by the first terminal on the predetermined resource, and returns a fourth response to the base station according to the monitoring result. The response determines that the fourth terminal monitors that the signal quality of the discovery signal sent by the first terminal is less than a predetermined quality threshold, and determines the second resource as a reusable resource that can be multiplexed by the first terminal and the second terminal.

When the terminal that has been allocated the D2D resource returns a response to the base station, the terminal may return a response to the base station by using the allocated resource for transmitting the D2D signal. For example, the response returned to the base station may be carried by receiving the first instruction or The first OFDM symbol in the first D2D communication frame transmitted after the fourth instruction. After transmitting the first instruction or the fourth instruction, the base station receives the first D2D communication frame sent according to the allocated D2D resource, and parses the first one of the received D2D communication frames. OFDM symbols to obtain a first response or a fourth response returned by each D2D terminal. In addition, it should be noted that the resources used by the second terminal to return the second response or the third response to the base station may be dynamically configured by the base station.

 Step 1306: Allocate a target resource from the reusable resource.

 The base station can allocate some or all of the resources from all eligible reusable resources as target resources.

 When allocating D2D resources, the base station may consider allocating idle D2D resources first, and then considering multiplexing the allocated D2D resources when there are no idle D2D resources available for allocation.

 The base station may first detect whether there is an idle D2D resource, and if yes, allocate the target resource from the idle D2D resource. If the target resource is still insufficient after allocating the target resource from the idle D2D resource, the reusable resource is further determined. And allocate target resources from reusable resources. In addition, if the target resource allocated from the idle D2D resource is sufficient, the base station may not perform the subsequent step of determining the reusable resource, thereby saving system resources and reducing consumption.

 In addition, when the third command is sent to the second terminal, the base station may send all the allocated D2D resources and the idle D2D resources to the second terminal, and the second terminal monitors the D2D communication signal according to all the D2D resources, and according to the monitoring result. Returning a third response to the base station, the base station determining whether there is an idle resource in the resource whose signal strength of the D2D communication signal received by the second terminal is less than a predetermined intensity threshold, and if yes, preferentially allocating the target resource from the idle resource. If there are no idle resources or insufficient idle resources, the base station further performs the step of transmitting a fourth instruction to the fourth terminal.

 Step 1307: The target resource is sent to the first terminal and the second terminal, and the first terminal sends a D2D communication signal according to the target resource, and the second terminal receives the D2D communication signal according to the target resource.

In summary, the resource allocation method provided by the embodiment of the present invention determines the first terminal in the already allocated D2D resource after receiving the request for establishing end-to-end D2D communication with the second terminal, which is sent by the first terminal. The resource that can be multiplexed with the second terminal, and the target resource is allocated from the reusable resource, which solves the problem that in the prior art, when there are a large number of terminals requesting to establish D2D communication within the coverage of the base station, there may be no idle D2D resources. The problem of the situation for distribution, to achieve the purpose of improving resource utilization and system capacity. Referring to FIG. 24, a flowchart of a method for resource allocation according to an embodiment of the present invention is shown. The method can be used in a first terminal as shown in any one of FIG. 5 to FIG. The D2D resource of the D2D communication signal is transmitted to the second terminal. The resource allocation method may include: Step 1401: Send, to the base station, a request for establishing end-to-end D2D communication with the second terminal, where the request is used to indicate that the base station determines, in the already allocated D2D resource, that the first terminal and the The second terminal multiplexes the reusable resources, and allocates the target resources from the reusable resources;

 Step 1402: Receive a target resource sent by the base station.

 Step 1403: Send a D2D communication signal to the second terminal according to the target resource.

 In summary, the resource allocation method provided by the embodiment of the present invention, by transmitting a request for establishing D2D communication with a second terminal to a base station, is allocated by the base station from the allocated D2D resources and can be reused by the first terminal and the second terminal. And transmitting the D2D communication signal according to the resource allocated by the base station, which solves the problem that in the prior art, when the number of terminals requesting to establish D2D communication within the coverage of the base station is large, there may be a situation that no idle D2D resource is available for allocation. Achieve the goal of improving resource utilization and system capacity. Referring to FIG. 25, a flow chart of a method for resource allocation according to another embodiment of the present invention is shown. The method can be used to request a D2D resource for transmitting a D2D communication signal to a second terminal to a base station in the first terminal as shown in any of Figures 5-8. The resource allocation method can include:

 Step 1501, periodically sending a discovery signal;

 A terminal supporting D2D communication can periodically transmit a discovery signal Discovery signal on a predetermined time-frequency resource.

 Step 1502: Send, to the base station, a request for establishing end-to-end D2D communication with the second terminal. The request is used to indicate that the base station determines, in the already allocated D2D resource, that the first terminal and the second terminal are multiplexed. The resources can be reused and the target resources are allocated from the reusable resources.

 When the first terminal receives the discovery signal sent by the second terminal and detects that D2D communication can be performed with the second terminal, the base station may send a request for D2D communication with the second terminal.

 The signal quality of the discovery signal sent by the first terminal received by the terminal allocated to receive the D2D communication is less than a predetermined quality threshold, and the signal strength of the D2D communication signal received by the second terminal is less than A resource with a predetermined intensity threshold. The D2D resource can be a time-frequency resource.

Specifically, the reusable resource needs to meet two conditions: first, the signal quality of the discovery signal sent by the first terminal received by the terminal that is allocated to receive the D2D communication is less than a predetermined quality threshold; Second, the signal strength of the D2D communication signal received by the second terminal according to the reusable resource is less than a predetermined intensity threshold. Wherein, satisfying the first condition indicates that when the first terminal passes the recoverable When the D2D communication signal is sent to the second terminal by using the resource, the terminal that receives the D2D communication signal using the reusable resource other than the second terminal has no influence; the second condition is satisfied to indicate that the first terminal is The D2D communication signal sent by the other terminal using the reusable resource has no influence on the second terminal. For a specific method for the base station to determine the reusable resource, refer to the description in the corresponding embodiment of the base station shown in FIG. 2, which is not described in this embodiment.

 It should be noted that the discovery signal sent by the first terminal may carry the reference content that is known in advance by each terminal, and after receiving the discovery signal, each D2D terminal parses the discovery signal, and performs the parsed content and the reference content. Comparing, obtaining the parsing accuracy rate, and using the parsing accuracy rate as the signal quality of the received discovery signal sent by the first terminal, and subsequently assisting the base station to determine the reusable resource according to the signal quality of the discovery signal sent by the first terminal, specifically Please refer to the description in the corresponding embodiment of the base station shown in FIG. 2, which is not described in this embodiment.

 Step 1503: Receive a target resource sent by the base station.

 Step 1504: Send a D2D communication signal to the second terminal according to the target resource.

 In summary, the resource allocation method provided by the embodiment of the present invention, by transmitting a request for establishing D2D communication with a second terminal to a base station, is allocated by the base station from the allocated D2D resources and can be reused by the first terminal and the second terminal. And transmitting the D2D communication signal according to the resource allocated by the base station, which solves the problem that in the prior art, when the number of terminals requesting to establish D2D communication within the coverage of the base station is large, there may be a situation that no idle D2D resource is available for allocation. Achieve the goal of improving resource utilization and system capacity. Referring to FIG. 26, a flow chart of a method for resource allocation according to an embodiment of the present invention is shown. The method can be used to receive the D2D communication signal sent by the first terminal according to the D2D resource allocated by the base station in the second terminal shown in any one of FIG. 9 to FIG. The resource allocation method may include: Step 1601: Receive a target resource sent by a base station, where the target resource is already allocated after the base station receives a request sent by the first terminal to establish end-to-end D2D communication with the second terminal. Determining, among the D2D resources, reusable resources multiplexed by the first terminal and the second terminal, and resources allocated from the reusable resources;

 Step 1602: Receive, according to the target resource, a D2D communication signal sent by the first terminal.

In summary, the resource allocation method provided by the embodiment of the present invention can be reused by the receiving base station after determining the reusable resources that can be multiplexed by the first terminal and the second terminal in the allocated D2D resources. a target resource allocated in the resource, and receiving the D2D sent by the first base station according to the target resource The communication signal solves the problem that in the prior art, when the number of terminals requesting to establish D2D communication within the coverage of the base station is large, there may be a situation that no idle D2D resources are available for allocation, and the purpose of improving resource utilization and system capacity is achieved. Referring to FIG. 27, a flowchart of a method for resource allocation according to another embodiment of the present invention is shown. The method may be used to receive the D2D communication signal sent by the first terminal according to the D2D resource allocated by the base station in the second terminal as shown in any one of FIG. 9 to FIG. The resource allocation method may include: Step 1701: Receive a second instruction that is sent by the base station and includes the first resource;

 The first resource is a D2D resource that has been allocated to the third terminal for receiving the D2D communication signal. The base station may send, by using the high layer signaling, the first instruction to each terminal that has been allocated the D2D resource for the D2D communication, and after receiving the first instruction, each D2D terminal monitors the first terminal to send the predetermined time-frequency resource. Detecting a signal Discovery signal, and returning a first response to the base station according to the monitored discovery signal, the base station determining, according to the first response, which terminal the signal quality of the discovery signal sent by the first terminal is less than a predetermined quality threshold, and assigning The D2D resource of the terminal whose monitored signal quality of the discovery signal sent by the first terminal is less than the predetermined quality threshold is determined as the first resource.

 Step 1702: Monitor a D2D communication signal according to the first resource, and detect a signal strength of the D2D communication signal that is monitored according to the first resource, to obtain a first detection result.

 Step 1703: Send a second response to the base station according to the first detection result.

 The second response is for indicating whether the signal strength of the D2D communication signal monitored according to the first resource is less than a predetermined intensity threshold.

 Determining, by the base station, that the signal strength of the D2D communication signal that is monitored by the second terminal according to the first resource is less than a predetermined signal strength threshold according to the second response, determining, by the first terminal, that the first resource is restored by the first terminal and the second terminal Reusable resources used.

 It should be noted that, in the response returned by the second terminal to the base station, the strength of the monitored D2D communication signal may be directly sent to the base station, and the base station detects whether the signal strength is less than a predetermined intensity threshold; or the second terminal may also First, it is detected whether the signal strength is less than a predetermined intensity threshold, and the detection result is carried in the response and sent to the base station. In addition, the resources used by the second terminal to return the second response to the base station can be dynamically configured by the base station.

 Step 1704: Receive a target resource sent by the base station.

The target resource is a resource allocated by the base station from the reusable resource; Step 1705: Receive a D2D communication signal sent by the first terminal according to the target resource.

 In summary, the resource allocation method provided by the embodiment of the present invention can be reused by the receiving base station after determining the reusable resources that can be multiplexed by the first terminal and the second terminal in the allocated D2D resources. A target resource allocated in the resource, and receiving the D2D communication signal sent by the first base station according to the target resource, which solves the problem that in the prior art, when there are a large number of terminals requesting to establish D2D communication within the coverage of the base station, there may be no idle D2D resources. The problem of the situation that can be allocated to achieve the purpose of improving resource utilization and system capacity. Referring to FIG. 28, a flow chart of a method for resource allocation according to another embodiment of the present invention is shown. The method can be used to receive the D2D communication signal sent by the first terminal according to the D2D resource allocated by the base station in the second terminal shown in any one of FIG. 9 to FIG. The resource allocation method may include: Step 1801: Receive a third instruction that is sent by the base station and includes the second resource;

 The second resource is a resource that has been allocated to the fourth terminal for receiving the D2D communication signal. Step 1802, detecting, according to the second resource, the D2D communication signal, detecting a signal strength of the D2D communication signal that is monitored according to the second resource, and obtaining Second test result;

 Step 1803: Send a third response to the base station according to the second detection result.

 The third response is for indicating whether the signal strength of the D2D communication signal monitored according to the second resource is less than a predetermined intensity threshold.

 In a practical application, the base station may send, by using the high layer signaling, the D2D resource that is currently allocated to the fourth terminal to receive the D2D communication signal as the second resource, and the second terminal monitors the D2D communication according to the second resource sent by the base station. a signal, and returning a third response to the base station according to the monitoring result, when the base station determines, according to the third response, that the signal strength of the D2D communication signal received by the second terminal according to the second resource is less than a predetermined intensity threshold, sending the fourth terminal to the fourth terminal After receiving the instruction, the fourth terminal monitors the discovery signal sent by the first terminal on the predetermined resource, and returns a fourth response to the base station according to the monitoring result, where the fourth response indicates that the fourth terminal monitors the first terminal to send When the signal quality of the discovery signal is less than the predetermined quality threshold, the second resource is determined as a reusable resource that can be multiplexed by the first terminal and the second terminal.

It should be noted that, in the response returned by the second terminal to the base station, the strength of the monitored D2D communication signal may be directly sent to the base station, and the base station detects whether the signal strength is less than a predetermined intensity threshold; or the second terminal may also First, it is detected whether the signal strength is less than a predetermined intensity threshold, and the detection result is carried in the response and sent to the base station. In addition, when the second terminal returns a third response to the base station, The resources used can be dynamically configured by the base station.

 Step 1804: Receive a target resource sent by the base station.

 The target resource is a resource allocated by the base station from the reusable resource;

 Step 1805: Receive a D2D communication signal sent by the first terminal according to the target resource.

 In summary, the resource allocation method provided by the embodiment of the present invention can be reused by the receiving base station after determining the reusable resources that can be multiplexed by the first terminal and the second terminal in the allocated D2D resources. A target resource allocated in the resource, and receiving the D2D communication signal sent by the first base station according to the target resource, which solves the problem that in the prior art, when there are a large number of terminals requesting to establish D2D communication within the coverage of the base station, there may be no idle D2D resources. The problem of the situation that can be allocated to achieve the purpose of improving resource utilization and system capacity. Referring to FIG. 29, a flow chart of a method for resource allocation according to an embodiment of the present invention is shown. The method may be used to assist the base station in the allocated D2D resource after receiving the request by the first terminal to establish D2D communication with the second terminal in the third terminal as shown in any one of FIG. 13 to FIG. Determine reusable resources. The resource allocation method can include:

 Step 1901: Receive a first instruction sent by the base station, where the first instruction is an instruction sent by the base station after receiving a request for establishing a D2D communication with the second terminal sent by the first terminal;

 Step 1902: Listen to the discovery signal sent by the first terminal.

 Step 1903: Detect the signal quality of the detected discovery signal, and obtain a third detection result. Step 1904, send a first response to the base station according to the third detection result; and the base station instructs the monitored response in the first response. When the signal quality of the discovery signal is less than the predetermined quality threshold, sending a second instruction including the first resource to the second terminal, and receiving a second response returned by the second terminal, and indicating the second terminal in the second response When the signal strength of the D2D communication signal monitored by the first resource is less than a predetermined intensity threshold, determining the first resource as a reusable resource, allocating a target resource from the reusable resource, and sending the target resource to The first terminal and the second terminal, the first terminal sends a D2D communication signal according to the target resource, and the second terminal receives the D2D communication signal according to the target resource; wherein the first resource is assigned to the The third terminal is configured to receive the D2D resource of the D2D communication signal, where the second instruction is used to instruct the second terminal to monitor the D2D according to the first resource. Channel signal; the second response for indicating whether the signal strength of the second terminal monitors according to the first resource for the D2D communication signal strength is less than the predetermined threshold value.

In summary, the resource allocation method provided by the embodiment of the present invention is sent by receiving a base station. After the first instruction, the discovery signal sent by the first terminal is monitored, and the first response is returned to the base station according to the monitoring result, where the signal quality of the discovery signal of the first terminal received by the base station in the first response is less than the predetermined quality. Sending a second instruction to the second terminal after the threshold, and indicating, according to the second response returned by the second terminal, the signal strength of the D2D communication signal that the second terminal monitors according to the first resource used by the third terminal to receive the D2D communication signal. When the threshold is less than the predetermined strength threshold, the first resource is determined as a reusable resource, which solves the problem that in the prior art, when the number of terminals requesting to establish D2D communication within the coverage of the base station is large, there may be no idle D2D resources available for allocation. The problem is to achieve the goal of improving resource utilization and system capacity. Referring to FIG. 30, a flowchart of a method for resource allocation according to another embodiment of the present invention is shown. The method may be used to assist the base station in the allocated D2D resource after receiving the request by the first terminal to establish D2D communication with the second terminal in the third terminal as shown in any one of FIG. 13 to FIG. Determine reusable resources. The resource allocation method can include:

 Step 2001, receiving a first instruction sent by the base station;

 The first instruction is an instruction sent by the base station after receiving a request sent by the first terminal for establishing D2D communication with the second terminal;

 Step 2002: Listening to the discovery signal sent by the first terminal;

 Specifically, the terminal supporting the D2D communication may periodically send the discovery signal Discovery signal on the predetermined time-frequency resource, when the first terminal receives the discovery signal sent by the second terminal and detects that the D2D communication can be performed with the second terminal. And the base station may send a request for D2D communication with the second terminal. After receiving the first instruction sent by the base station, the third terminal may monitor the discovery signal periodically sent by the first terminal.

 Step 2003: Detecting the signal quality of the detected discovery signal, and obtaining a third detection result; the discovery signal sent by the first terminal may carry the reference content previously known by each terminal, and after receiving the discovery signal, the third terminal The discovery signal is parsed, and the content obtained by the parsing is compared with the reference content to obtain the parsing accuracy rate, and the parsing accuracy rate is used as the signal quality of the received discovery signal sent by the first terminal.

 Step 2004: Send a first response to the base station according to the third detection result.

 The third terminal may send a first response frame including the first response to the base station, where the first response frame is a first D2D communication frame sent according to the first resource after receiving the first instruction.

Where the terminal that has been allocated the D2D resource returns a response to the base station, it can pass the assigned, The resource for transmitting the D2D signal returns a response to the base station. For example, the response returned to the base station may be carried in the first OFDM symbol in the first D2D communication frame transmitted after receiving the first instruction. After transmitting the first instruction, the base station receives the first D2D communication frame sent according to the allocated D2D resource, and parses the first OFDM symbol in the received D2D communication frame to obtain the first response returned by the third terminal. .

 The base station sends a second command including the first resource to the second terminal, and receives a second response returned by the second terminal, when the first response indicates that the signal quality of the detected signal is less than a predetermined quality threshold. When the second response indicates that the signal strength of the D2D communication signal that the second terminal monitors according to the first resource is less than a predetermined strength threshold, determining the first resource as a reusable resource, from the reusable resource. Allocating a target resource, and transmitting the target resource to the first terminal and the second terminal, wherein the first terminal sends a D2D communication signal according to the target resource, and the second terminal receives the D2D communication signal according to the target resource;

 The first resource is a D2D resource that is allocated to the third terminal for receiving the D2D communication signal, and the second instruction is used to instruct the second terminal to monitor the D2D communication signal according to the first resource; And indicating whether the signal strength of the D2D communication signal monitored by the second terminal according to the first resource is less than the predetermined intensity threshold.

 The signal quality of the discovery signal sent by the first terminal received by the terminal allocated to receive the D2D communication is less than a predetermined quality threshold, and the signal strength of the D2D communication signal received by the second terminal is less than A resource with a predetermined intensity threshold. The D2D resource can be a time-frequency resource.

 Specifically, the reusable resource needs to meet two conditions: first, the signal quality of the discovery signal sent by the first terminal received by the terminal that is allocated to receive the D2D communication is less than a predetermined quality threshold; Second, the signal strength of the D2D communication signal received by the second terminal according to the reusable resource is less than a predetermined intensity threshold. Wherein, satisfying the first condition indicates that when the first terminal transmits the D2D communication signal to the second terminal through the reusable resource, the terminal that receives the D2D communication signal using the reusable resource except the second terminal is not The second condition is met, indicating that the D2D communication signal sent by the terminal other than the first terminal using the reusable resource has no influence on the second terminal.

The base station may send, by using the high layer signaling, a first instruction to the third terminal that has been allocated the D2D resource for the D2D communication, and after receiving the first instruction, the third terminal monitors the discovery sent by the first terminal on the predetermined time-frequency resource. a signal of the Discovery signal, and returning a first response to the base station according to the monitored discovery signal, the base station determining, according to the first response, the discovery message sent by the first terminal monitored by the third terminal When the signal quality of the number is less than the predetermined quality threshold, the D2D resource allocated to the third terminal is determined as the first resource. The base station sends a second indication including the first resource to the second terminal, and after receiving the second indication, the second terminal monitors the D2D communication signal sent by the other terminal through the second resource according to the second resource, and according to the monitoring As a result, the second response is returned to the base station, and the base station determines, according to the second response, that the resource whose signal strength of the D2D communication signal monitored by the second terminal is less than the predetermined signal strength threshold is a reusable resource.

 It should be noted that, in the response returned by the third terminal to the base station, the signal quality of the monitored discovery signal of the first terminal may be directly sent to the base station, and the base station detects whether the signal quality is less than a predetermined quality threshold; or, the third terminal It is also possible to first detect whether the signal quality is less than a predetermined quality threshold, and carry the detection result in the response and send it to the base station.

 In summary, the resource allocation method provided by the embodiment of the present invention listens to the discovery signal sent by the first terminal after receiving the first instruction sent by the base station, and returns a first response to the base station according to the monitoring result, where the base station is in the The first response indicates that the signal quality of the discovery signal of the first terminal received by the third terminal is less than the predetermined quality threshold, and sends a second instruction to the second terminal, and indicates that the second terminal is based on the second response returned by the second terminal. When the signal strength of the D2D communication signal that is received by the first resource that is received by the third terminal is less than the predetermined strength threshold, the first resource is determined to be a reusable resource, which solves the problem in the prior art when the base station is in coverage. When the number of terminals requesting to establish D2D communication is large, there may be a problem that no idle D2D resources are available for allocation, and the purpose of improving resource utilization and system capacity is achieved. Referring to FIG. 31, a flow chart of a method for resource allocation according to an embodiment of the present invention is shown. The method may be used to assist the base station in the allocated D2D resource after receiving the request of the first terminal to establish D2D communication with the second terminal in the fourth terminal as shown in any one of FIG. 17 to FIG. Determine reusable resources. The resource allocation method can include:

Step 2101: Receive a fourth command sent by the base station, where the fourth command is that the base station receives a request for establishing a D2D communication with the second terminal, and sends a second resource to the second terminal. a third instruction, receiving a third response returned by the second terminal, and transmitting, by the third terminal, an instruction sent by the second terminal according to the signal strength of the D2D communication signal monitored by the second resource is less than a predetermined intensity threshold; The second resource is a resource that has been allocated to the fourth terminal for receiving the D2D communication signal, and the third command is used to instruct the second terminal to monitor the D2D communication signal according to the second resource, where the third response is used to indicate the The D2D communication signal monitored by the second terminal according to the second resource Whether the signal strength is less than the predetermined intensity threshold;

 Step 2102: Listen to the discovery signal sent by the first terminal.

 Step 2103: Detect the signal quality of the detected discovery signal, and obtain a fourth detection result. Step 2104: Send a fourth response to the base station according to the fourth detection result. The fourth response is used to indicate the detected discovery signal. Whether the signal quality is less than a predetermined quality threshold; when the signal quality of the discovery signal monitored by the fourth response indication is less than the predetermined quality threshold, the second resource is determined as a reusable resource, and the Allocating a target resource with a resource, and transmitting the target resource to the first terminal and the second terminal, the first terminal sends a D2D communication signal according to the target resource, and the second terminal receives the D2D according to the target resource. Communication signal.

 In summary, the resource allocation method provided by the embodiment of the present invention, the receiving base station sends a third instruction including the second resource to the second terminal, and indicates the second terminal according to the received third response returned by the second terminal. After detecting the fourth command sent when the signal strength of the D2D communication signal monitored by the second resource is less than the predetermined intensity threshold, detecting the signal quality of the detected discovery signal sent by the first terminal, and returning the fourth response to the base station according to the detection result. And determining, by the base station, the second resource as the reusable resource when the signal quality of the discovery signal sent by the first terminal that is detected by the fourth terminal in the fourth response is less than the predetermined quality threshold, which solves the problem of the base station coverage in the prior art. When the number of terminals requesting to establish D2D communication is large, there may be a problem that no idle D2D resources are available for allocation, and the purpose of improving resource utilization and system capacity is achieved. Referring to FIG. 32, a flow chart of a method for resource allocation according to another embodiment of the present invention is shown. The method may be used to assist the base station in the allocated D2D resource after receiving the request of the first terminal to establish D2D communication with the second terminal in the fourth terminal as shown in any one of FIG. 17 to FIG. Determine reusable resources. The resource allocation method can include:

 Step 2201: Receive a fourth instruction sent by the base station.

The fourth instruction is that the base station receives a request for establishing D2D communication with the second terminal by the first terminal, and sends a third instruction including the second resource to the second terminal, and receives the return of the second terminal. a third response, and an instruction sent when the second terminal indicates that the signal strength of the D2D communication signal monitored by the second resource is less than a predetermined intensity threshold according to the second resource; the second resource is allocated to the fourth terminal a third command for instructing the second terminal to monitor the D2D communication signal according to the second resource, where the third command is used to indicate that the second terminal is listening to the D2D according to the second resource. Whether the signal strength of the communication signal is less than the predetermined intensity threshold; Step 2202: Listen to the discovery signal sent by the first terminal.

 Step 2203, detecting the signal quality of the detected discovery signal, and obtaining a fourth detection result. The method for the fourth terminal to listen to the discovery signal sent by the first terminal and detecting the signal quality of the discovery signal is similar to the third terminal, and is no longer here. Narration.

 Step 2204: Send a fourth response to the base station according to the fourth detection result. The fourth response is used to indicate whether the monitored signal quality of the discovery signal is less than a predetermined quality threshold.

 The fourth terminal sends a second response frame including the fourth response to the base station, where the second response frame is the first D2D communication frame sent according to the second resource after receiving the fourth instruction.

 When the terminal that has been allocated the D2D resource returns a response to the base station, the terminal may return a response to the base station by using the allocated resource for transmitting the D2D signal. For example, the response returned to the base station may be carried after receiving the fourth instruction. The first OFDM symbol in the first D2D communication frame sent. After transmitting the fourth instruction, the base station receives the first D2D communication frame sent according to the allocated D2D resource, and parses the first OFDM symbol in the received D2D communication frame to obtain the fourth response returned by each D2D terminal. .

 It should be noted that, in the response returned by the fourth terminal to the base station, the signal quality of the detected first terminal's discovery signal may be directly sent to the base station, and the base station detects whether the signal quality is less than a predetermined quality threshold; or, the fourth terminal It is also possible to first detect whether the signal quality is less than a predetermined quality threshold, and carry the detection result in the response and send it to the base station.

 The base station determines the second resource as a reusable resource, allocates a target resource from the reusable resource, and allocates the signal to the reusable resource when the fourth response indicates that the signal quality of the detected signal is less than the predetermined quality threshold. The target resource is sent to the first terminal and the second terminal, and the first terminal sends a D2D communication signal according to the target resource, and the second terminal receives the D2D communication signal according to the target resource.

 The signal quality of the discovery signal sent by the first terminal received by the terminal allocated to receive the D2D communication is less than a predetermined quality threshold, and the signal strength of the D2D communication signal received by the second terminal is less than A resource with a predetermined intensity threshold. The D2D resource can be a time-frequency resource.

Specifically, the reusable resource needs to meet two conditions: first, the signal quality of the discovery signal sent by the first terminal received by the terminal that is allocated to receive the D2D communication is less than a predetermined quality threshold; Second, the signal strength of the D2D communication signal received by the second terminal according to the reusable resource is less than a predetermined intensity threshold. Wherein, satisfying the first condition indicates that when the first terminal transmits the D2D communication signal to the second terminal through the reusable resource, the terminal that receives the D2D communication signal using the reusable resource except the second terminal is not Will have an effect; meet the second condition to indicate that A D2D communication signal transmitted by another terminal other than a terminal using the reusable resource does not affect the second terminal.

 The base station may send, by using the high layer signaling, the D2D resource that is currently allocated to the fourth terminal to receive the D2D communication signal as the second resource to the second terminal, and the second terminal monitors the D2D communication signal according to the second resource sent by the base station, and according to The monitoring result returns a third response to the base station, and when the base station determines, according to the third response, that the signal strength of the D2D communication signal received by the second terminal according to the second resource is less than a predetermined intensity threshold, the fourth command is sent to the fourth terminal, and the fourth After receiving the instruction, the terminal monitors the discovery signal sent by the first terminal on the predetermined resource, and returns a fourth response to the base station according to the monitoring result, where the fourth response indicates that the fourth terminal monitors the discovery signal sent by the first terminal. When the signal quality is less than the predetermined quality threshold, the second resource is determined to be a reusable resource that can be multiplexed by the first terminal and the second terminal.

 In summary, the resource allocation method provided by the embodiment of the present invention, the receiving base station sends a third instruction including the second resource to the second terminal, and indicates the second terminal according to the received third response returned by the second terminal. After detecting the fourth command sent when the signal strength of the D2D communication signal monitored by the second resource is less than the predetermined intensity threshold, detecting the signal quality of the detected discovery signal sent by the first terminal, and returning the fourth response to the base station according to the detection result. And determining, by the base station, the second resource as the reusable resource when the signal quality of the discovery signal sent by the first terminal that is detected by the fourth terminal in the fourth response is less than the predetermined quality threshold, which solves the problem of the base station coverage in the prior art. When the number of terminals requesting to establish D2D communication is large, there may be a problem that no idle D2D resources are available for allocation, and the purpose of improving resource utilization and system capacity is achieved. Referring to FIG. 33, a flow chart of a method for resource allocation according to an embodiment of the present invention is shown. The method can be used to allocate reusable resources for terminals requesting D2D communication in an allocated D2D resource. It is assumed that the D2D resources in the system are not fixed, and the base station dynamically configures the terminal logarithm of the D2D communication according to the current needs. When the first terminal requests to establish D2D communication with the second terminal, the base station first considers multiplexing the allocated D2D resources. The resource allocation method can include:

Step 2301: The first terminal sends a request for establishing D2D communication with the second terminal to the base station. The terminal supporting the D2D communication may periodically send the discovery signal Discovery signal on the predetermined time-frequency resource, when the first terminal receives the second terminal. The transmitted discovery signal and detecting that the D2D communication can be performed with the second terminal may send a request for D2D communication with the second terminal to the base station. Step 2302: The base station sends a first instruction to the third terminal.

 In a practical application, the base station may broadcast the high layer signaling to the terminal that has been allocated the D2D resource for the D2D communication, and indicates that each terminal that has allocated the D2D resource listens to the discovery signal sent by the first terminal.

 Step 2303: The third terminal monitors the discovery signal sent by the first terminal according to the first instruction. Step 2304: The third terminal returns a first response to the base station.

 The first response is used to indicate whether the signal quality of the discovery signal sent by the first terminal monitored by the third terminal is less than a predetermined quality threshold.

 Specifically, the discovery signal sent by the first terminal may carry the reference content that is known in advance by each terminal, and after receiving the discovery signal, each terminal that has been allocated the D2D resource parses the discovery signal, and parses the obtained content and The reference content is compared, and the resolution accuracy is obtained, and the resolution accuracy is used as the signal quality of the received discovery signal transmitted by the first terminal.

 Step 2305: The base station sends a second instruction including the first resource to the second terminal, when the first response indicates that the signal quality of the discovery signal sent by the first terminal that is monitored by the third terminal is less than a predetermined quality threshold.

 The first resource is pre-assigned to the third terminal by the base station, so that the third terminal receives the D2D resource of the D2D communication signal.

 In a practical application, the base station may use, as the first resource, the D2D resource used by the terminal corresponding to the response corresponding to the response that the signal quality of the discovery signal of the first terminal received in the previous step is less than the predetermined quality threshold to receive the D2D communication signal.

 It should be noted that, in the response that the terminal that has been allocated the D2D resource to the base station, the signal quality of the detected first terminal is directly sent to the base station, and the base station detects whether the signal strength is less than a predetermined quality threshold. Alternatively, it is also possible to first detect whether the signal quality is less than a predetermined quality threshold, and carry the detection result in the response and send it to the base station.

 The discovery signal sent by the first terminal may be interfered by the discovery signal sent by other terminals. The receiving end receives the mixed signal of the discovery signal and the interference signal sent by the first terminal. If based on the signal strength, the receiving end can only measure the strength of the mixed signal, and cannot represent the signal of the first terminal. Intensity, therefore, the embodiment of the present invention sets the determination threshold according to the signal quality of the discovery signal of the first terminal, and can improve the accuracy of the determination.

 Step 2306, the second terminal monitors the D2D communication signal according to the first resource.

The second terminal monitors the D2D communication signal according to the first resource, and detects the monitored D2D communication. The strength of the signal.

 Step 2307: The second terminal returns a second response to the base station.

 The second response is used to indicate whether the signal strength of the D2D communication signal monitored by the second terminal according to the first resource is less than a predetermined intensity threshold.

 In the response returned by the second terminal to the base station, the strength of the monitored D2D communication signal may be directly sent to the base station, and the base station detects whether the signal strength is less than a predetermined intensity threshold; or the second terminal may first detect whether the signal strength is less than a predetermined one. The intensity threshold is carried and the detection result is carried in the response and sent to the base station.

 Step 2308: The base station determines, according to the second response, that the signal strength of the D2D communication signal that is monitored by the second terminal according to the first resource is less than a predetermined strength threshold, determining the first resource as a reusable resource;

 After receiving the second response returned by the second terminal, the base station determines, according to the second response, the resource whose signal strength of the D2D communication signal monitored by the second terminal is less than the predetermined strength threshold as the reusable resource.

 Step 2309: The base station allocates a target resource from the reusable resources.

 The base station may allocate some or all of the resources of the reusable resource as the target resource according to actual conditions or pre-specified rules.

 Step 2310: If the target resource is insufficient, the base station further allocates the target resource from the idle D2D resource.

 After the base station allocates the target resource from the reusable resource, it can detect whether the target resource is sufficient. If the target resource allocated from the reusable resource is sufficient, the idle D2D resource is no longer allocated; if the second terminal does not exist According to the resource whose signal strength of the D2D communication signal is less than the predetermined intensity threshold, or the target resource allocated from the reusable resource is still insufficient, the base station detects whether there is an idle D2D resource, and if there is an idle D2D resource, The target resource is further allocated from the idle D2D resources.

 Step 2311: The base station sends the target resource to the first terminal and the second terminal, where the first terminal sends the D2D communication signal according to the target resource, and the second terminal receives the D2D communication signal according to the target resource.

 It should be noted that, in the embodiment of the present invention, the base station first considers multiplexing the allocated resources, and when the multiplexable resources are insufficient, the idle D2D resources are taken as an example for description. In practical applications, the idle allocation may also be considered first. D2D resources, when the idle D2D resources are insufficient, consider multiplexing the allocated resources.

In summary, the resource allocation method provided by the embodiment of the present invention, after receiving the request of the first terminal to establish D2D communication with the second terminal, the base station instructs the third terminal to monitor the sending of the first terminal. a signal, and when the signal quality of the discovery signal sent by the first terminal monitored by the third terminal is less than a predetermined quality threshold, instructing the second terminal to monitor the D2D communication signal according to the first resource used by the third terminal to receive the D2D communication signal, And determining, by the second terminal, that the signal strength of the D2D communication signal that is monitored by the first resource is less than a predetermined strength threshold, determining the first resource as a reusable resource, and allocating the first terminal to the first in the reusable resource The second terminal sends the target resource of the D2D communication signal, which solves the problem that in the prior art, when there are a large number of terminals requesting to establish D2D communication within the coverage of the base station, there may be a situation that no idle D2D resources are available for allocation, thereby improving resource utilization. The purpose of the rate and system capacity. Referring to FIG. 34, a flowchart of a method for resource allocation according to another embodiment of the present invention is shown. The method can be used to allocate reusable resources to terminals requesting D2D communication in an allocated D2D resource. The D2D resource in the system is fixed. When the first terminal requests to establish D2D communication with the second terminal, the base station first considers allocating idle D2D resources, and then considers multiplexing the allocated D2D resources. The resource allocation method can include:

 Step 2401, the first terminal sends a request for establishing D2D communication with the second terminal to the base station; the terminal supporting the D2D communication may periodically send the discovery signal Discovery signal on the predetermined time-frequency resource, when the first terminal receives the second terminal. The transmitted discovery signal and detecting that the D2D communication can be performed with the second terminal may send a request for D2D communication with the second terminal to the base station.

 Step 2402: The base station detects whether there is an idle D2D resource.

 In an actual application, if the base station detects that there is an idle D2D resource, the target resource is allocated from the idle D2D resource, and the allocated target resource is detected to be sufficient. If the allocated target resource is sufficient, the subsequent step is not performed.

 Step 2403: If there is no idle D2D resource, the base station sends a third instruction including the second resource to the second terminal.

 If the target resource allocated by the base station from the idle D2D resource is insufficient or there is no idle D2D resource, the base station sends the resource that has been allocated to the fourth terminal as the receiving D2D communication signal as the second resource to the second terminal.

 The base station may broadcast the high layer signaling to the second terminal, where the broadcast high layer signaling carries the second resource, to indicate that the second terminal monitors the D2D communication signal according to the second resource.

Step 2404: The second terminal monitors the D2D communication signal according to the second resource. Step 2405: The second terminal returns a third response to the base station.

 The third response is used to indicate whether the signal strength of the D2D communication signal monitored by the second terminal according to the second resource is less than a predetermined intensity threshold.

 a specific step of the second terminal listening to the D2D communication signal according to the second resource, and returning the third response to the base station. In the method shown in FIG. 33, the second terminal monitors the D2D communication signal according to the first resource, and returns the first response to the base station. The steps are similar and will not be described here.

 Step 2406: The base station sends a fourth instruction to the fourth terminal when the third response indicates that the signal strength of the D2D communication signal monitored by the second terminal according to the second resource is less than a predetermined strength threshold.

 In an actual application, the base station may send all the allocated D2D resources to the second terminal, and the second terminal monitors the D2D communication signal according to the allocated D2D resources, and returns a third response to the base station according to the monitoring result. Determining, by the base station, the resource indicated by the second terminal in the third response that the signal strength of the D2D communication signal that is monitored is less than the predetermined strength threshold is a primary resource, and the terminal that is allocated the primary resource to receive the D2D communication signal Send the fourth command.

 Step 2407, the fourth terminal monitors the discovery signal sent by the first terminal.

 Step 2408: The fourth terminal returns a fourth response to the base station.

 The fourth response is used to indicate whether the signal quality of the discovery signal sent by the first terminal monitored by the fourth terminal is less than a predetermined quality threshold.

 Step 2409: The base station determines the second resource as a reusable resource when the fourth response indicates that the signal quality of the discovery signal sent by the first terminal monitored by the fourth terminal is less than a predetermined quality threshold.

 If the signal quality of the discovery signal sent by the first terminal monitored by the terminal that is allocated the primary resource to receive the D2D communication signal is less than a predetermined quality threshold, the base station determines the primary resource as a reusable resource.

 Step 2410: The base station allocates a target resource from the reusable resource.

 The base station may allocate some or all of the resources of the reusable resource as the target resource according to actual conditions or pre-specified rules.

 Step 2411: The base station sends the target resource to the first terminal and the second terminal, where the first terminal sends the D2D communication signal according to the target resource, and the second terminal receives the D2D communication signal according to the target resource.

It should be noted that, in the embodiment of the present invention, the base station first considers allocating idle D2D resources, and when the idle D2D resources are insufficient, considering multiplexing the allocated resources as an example, in practical applications, the first application may be considered. With the allocated D2D resources, when there are no reusable resources in the allocated resources or when the reusable resources are insufficient, consider allocating idle D2D resources. According to the resource allocation method provided by the embodiment of the present invention, after receiving the request for establishing D2D communication with the second terminal by the first terminal, the base station instructs the second terminal to allocate the D2D communication according to the fourth terminal. The second resource of the signal monitors the D2D communication signal, and when the signal strength of the D2D communication signal monitored by the second terminal is less than the predetermined intensity threshold, instructs the fourth terminal to monitor the discovery signal sent by the first terminal, and the fourth terminal monitors the discovery. When the signal quality of the signal is less than the predetermined quality threshold, determining the second resource as a reusable resource, and allocating, in the reusable resource, the target resource used by the first terminal to send the D2D communication signal to the second terminal, In the technology, when the number of terminals requesting to establish D2D communication within the coverage of the base station is large, there may be a problem that no idle D2D resources are available for allocation, and the purpose of improving resource utilization and system capacity is achieved. Referring to FIG. 35, a system configuration diagram of a resource allocation system according to an embodiment of the present invention is shown. The system may include a base station 2501 as described in any of FIGS. 1 to 4, a first terminal 25002 as described in any of FIGS. 5 to 8, a second terminal 2503 as described in any of FIGS. 9 to 12, and At least one third terminal 2504 as described in any of FIGS. 13 to 16 and/or at least one fourth terminal 2505 as described in any of FIGS. 17 to 20.

 In summary, the resource allocation system provided by the embodiment of the present invention determines the first terminal in the already allocated D2D resource after receiving the request for establishing end-to-end D2D communication with the second terminal, which is sent by the first terminal. The resource that can be multiplexed with the second terminal, and the target resource is allocated from the reusable resource, which solves the problem that in the prior art, when there are a large number of terminals requesting to establish D2D communication within the coverage of the base station, there may be no idle D2D resources. The problem of the situation for distribution, to achieve the purpose of improving resource utilization and system capacity. It should be noted that, when the D2D resource is allocated, the base station and the terminal provided by the foregoing embodiment are only illustrated by using the foregoing functional modules. In actual applications, the function allocation may be completed by different functional modules as needed. The internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the base station, the first terminal, the second terminal, the third terminal, and the fourth terminal provided by the foregoing embodiments are in the same concept as the resource allocation method embodiment.

A person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by hardware, or may be instructed by a program to execute related hardware, and the program may be stored in a computer readable storage medium. The storage medium mentioned may be a read only memory, a magnetic disk or an optical disk or the like. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., which are within the spirit and scope of the present invention, should be included in the protection of the present invention. Within the scope.

Claims

claims 1. A base station, characterized in that, the base station includes: A request receiving module, configured to receive a request sent by the first terminal for establishing end-to-end D2D communication with the second terminal; A resource determination module, configured to determine reusable resources that can be multiplexed by the first terminal and the second terminal among the allocated D2D resources; A first resource allocation module, configured to allocate target resources from the reusable resources; A first resource sending module, configured to send the target resource to the first terminal, and the first terminal sends a D2D communication signal according to the target resource; The second resource sending module is configured to send the target resource to the second terminal, and the second terminal receives the D2D communication signal according to the target resource. 2. The base station according to claim 1, characterized in that the resource determination module includes: a first instruction sending unit, configured to send a first instruction to the third terminal, the first instruction being used to instruct the The third terminal monitors the discovery signal sent by the first terminal; A first response receiving unit, configured to receive a first response returned by the third terminal, where the first response is used to indicate whether the signal quality of the discovery signal monitored by the third terminal is less than a predetermined quality threshold; The second instruction sending unit is configured to send the first resource containing the first resource to the second terminal if the first response indicates that the signal quality of the discovery signal monitored by the third terminal is less than the predetermined quality threshold. The second instruction, the first resource is a D2D resource that has been allocated to the third terminal for receiving D2D communication signals, and the second instruction is used to instruct the second terminal to monitor D2D according to the first resource. communication signals; A second response receiving unit, configured to receive a second response returned by the second terminal, where the second response is used to indicate whether the signal strength of the D2D communication signal monitored by the second terminal according to the first resource is less than Predetermined intensity threshold; A first determining unit configured to, if the received second response indicates that the signal strength of the D2D communication signal monitored by the second terminal according to the first resource is less than the predetermined strength threshold, then set the first The resource is determined to be the reusable resource. 3. The base station according to claim 2, characterized in that: the first response receiving unit is configured to receive a first response frame containing the first response sent by the third terminal, and the first response frame is sent by the third terminal. The response frame is the first D2D communication frame sent by the third terminal according to the first resource after receiving the first instruction. 4. The base station according to claim 1, characterized in that, the resource determination module includes: a third instruction sending unit, configured to send a third instruction including a second resource to the second terminal, The second resource is a D2D resource that has been allocated to the fourth terminal for receiving the D2D communication signal; the third instruction is used to instruct the second terminal to monitor the D2D communication signal according to the second resource; A third response receiving unit, configured to receive a third response returned by the second terminal, where the third response is used to indicate whether the signal strength of the D2D communication signal monitored by the second terminal according to the second resource is less than Predetermined intensity threshold; A fourth instruction sending unit, configured to send to the fourth terminal if the third response indicates that the signal strength of the D2D communication signal monitored by the second terminal according to the second resource is less than the predetermined strength threshold. A fourth instruction, the fourth instruction is used to instruct the fourth terminal to monitor the discovery signal sent by the first terminal; A fourth response receiving unit, configured to receive a fourth response returned by the fourth terminal, where the fourth response is used to indicate whether the signal quality of the discovery signal monitored by the fourth terminal is less than a predetermined quality threshold; A second determination unit configured to determine the second resource as the second resource if the received fourth response indicates that the signal quality of the discovery signal monitored by the fourth terminal is less than the predetermined quality threshold. Reusable resources. 5. The base station according to claim 4, characterized in that: the fourth response receiving unit is configured to receive a second response frame containing the fourth response sent by the fourth terminal, and the second The response frame is the first D2D communication frame sent by the fourth terminal according to the second resource after receiving the fourth instruction. 6. The base station according to any one of claims 1 to 5, characterized in that, the base station further includes: a first detection module, configured to detect that the target resource is allocated from the reusable resources. adequacy; A second detection module, configured to detect whether there are idle D2D resources if the detection result of the first detection module is that the target resources are insufficient; The second resource allocation module is configured to allocate the target resource from the idle D2D resources if the detection result of the second detection module is that there are idle D2D resources. 7. The base station according to any one of claims 1 to 5, characterized in that, the base station further includes: a third detection module, configured to allocate targets from the reusable resources in the first resource allocation module. Before resources, check whether there are idle D2D resources; A third resource allocation module, configured to allocate the target resource from the idle D2D resources if the detection result of the third detection module is that there are idle D2D resources; The fourth detection module is used to detect whether the target resources are sufficient after allocating the target resources from the idle D2D resources; The first resource allocation module is configured to perform the step of allocating target resources from the reusable resources if the detection result of the fourth detection module is that the target resources are insufficient. 8. A base station, characterized in that, the base station includes: a receiver, a processor and a transmitter; the receiver is used to receive a message sent by a first terminal for establishing end-to-end D2D communication with a second terminal. ask; The processor is configured to determine, among the allocated D2D resources, reusable resources that can be multiplexed by the first terminal and the second terminal; The processor is configured to allocate target resources from the reusable resources; The processor is configured to control the transmitter to send the target resource to the first terminal and the second terminal, and the first terminal sends a D2D communication signal according to the target resource, and the The second terminal receives a D2D communication signal according to the target resource. 9. The base station according to claim 8, characterized in that, The processor is configured to control the transmitter to send a first instruction to a third terminal, where the first instruction is used to instruct the third terminal to monitor the discovery signal sent by the first terminal; The receiver is configured to receive a first response returned by the third terminal, where the first response is used to indicate whether the signal quality of the discovery signal monitored by the third terminal is less than a predetermined quality threshold; Processor, configured to: if the first response indicates that the discovery signal monitored by the third terminal If the signal quality of the signal is less than the predetermined quality threshold, the transmitter is controlled to send a second instruction including a first resource to the second terminal, where the first resource has been allocated to the third terminal. take over The D2D resource of the D2D communication signal, the second instruction is used to instruct the second terminal to monitor the D2D communication signal according to the first resource; The receiver is configured to receive a second response returned by the second terminal, where the second response is used to indicate whether the signal strength of the D2D communication signal monitored by the second terminal according to the first resource is less than a predetermined value. intensity threshold; The processor is configured to: if the second response received by the receiver indicates that the signal strength of the D2D communication signal monitored by the second terminal according to the first resource is less than the predetermined strength threshold, then The first resource is determined to be the reusable resource. 10. The base station according to claim 9, characterized in that: the receiver is configured to receive a first response frame containing the first response sent by the third terminal, and the first response frame is After receiving the first instruction, the third terminal sends the first D2D communication frame according to the first resource. 11. The base station according to claim 8, characterized in that, The processor is configured to control the transmitter to send a third instruction including a second resource to the second terminal, where the second resource is a D2D resource that has been allocated to a fourth terminal for receiving a D2D communication signal. ; The third instruction is used to instruct the second terminal to monitor D2D communication signals according to the second resource; The receiver is used to receive a third response returned by the second terminal, and the third response uses Instructing the second terminal whether the signal strength of the D2D communication signal monitored by the second resource is less than a predetermined strength threshold; The processor is configured to, if the third response indicates that the signal strength of the D2D communication signal monitored by the second terminal according to the second resource is less than the predetermined strength threshold, control the transmitter to the The fourth terminal sends a fourth instruction, the fourth instruction is used to instruct the fourth terminal to monitor the discovery signal sent by the first terminal; The receiver is configured to receive a fourth response returned by the fourth terminal, where the fourth response is used to indicate whether the signal quality of the discovery signal monitored by the fourth terminal is less than a predetermined quality threshold; A processor configured to, if the fourth response received by the receiver indicates that the signal quality of the discovery signal monitored by the fourth terminal is less than the predetermined quality threshold, then convert the second resource to Determine it as the reusable resource. 12. The base station according to claim 11, wherein the receiver is configured to receive a second response frame including the fourth response sent by the fourth terminal, and the second response frame is After receiving the fourth instruction, the fourth terminal sends the first D2D communication frame according to the second resource. 13. The base station according to any one of claims 8 to 12, characterized in that, The processor is also configured to detect whether the target resources are sufficient after allocating target resources from the reusable resources; The processor is configured to detect whether there are idle D2D resources if the detection result is that the target resource is insufficient; The processor is configured to allocate the target resource from the idle D2D resource if the detection result is that there is an idle D2D resource. 14. The base station according to any one of claims 8 to 12, characterized in that The processor is configured to detect whether there are idle D2D resources before allocating target resources from the reusable resources; The processor is configured to allocate the target resource from the idle D2D resource if the detection result is that there is an idle D2D resource; The processor is configured to detect whether the target resource is sufficient after allocating the target resource from the idle D2D resource; The processor is configured to perform the step of allocating target resources from the reusable resources if the detection result is that the target resources are insufficient. 15. First terminal, characterized in that, the first terminal includes: A request sending module, configured to send a request to the base station for establishing end-to-end D2D communication with the second terminal, where the request is used to indicate that the base station determines in the allocated D2D resources that it can be used by the first terminal and the second terminal. The reusable resources multiplexed by the second terminal, and allocate target resources from the reusable resources; The first resource receiving module is used to receive the target resources sent by the base station; a communication signal sending module, configured to send D2D communication to the second terminal according to the target resource Signal. 16. The first terminal according to claim 15, characterized in that, the first terminal further includes: a discovery signal sending module, configured to periodically send a discovery signal. 17. The first terminal, characterized in that the first terminal includes: a processor, a transmitter and a receiver; The processor is configured to control the transmitter to send a request to the base station for establishing end-to-end D2D communication with the second terminal, where the request is used to indicate that the base station determines that all D2D resources that have been allocated can be used. reusable resources multiplexed by the first terminal and the second terminal, and allocate target resources from the reusable resources; The receiver is used to receive target resources sent by the base station; The processor is configured to control the transmitter to send a D2D communication signal to the second terminal according to the target resource. 18. The first terminal according to claim 17, characterized in that, The processor is also used to control the transmitter to periodically send a discovery signal. 19. Second terminal, characterized in that, the second terminal includes: The second resource receiving module is configured to receive a target resource sent by the base station. The target resource is that after the base station receives a request sent by the first terminal for establishing end-to-end D2D communication with the second terminal, Determine reusable resources that can be multiplexed by the first terminal and the second terminal among the allocated D2D resources, and allocate resources from the reusable resources; A communication signal receiving module, configured to receive the D2D communication signal sent by the first terminal according to the target resource. 20. The second terminal according to claim 19, characterized in that, the second terminal further includes: a second instruction receiving module, configured to receive the target resource sent by the base station before the second resource receiving module receives The second instruction sent by the base station includes a first resource, and the first resource is a D2D resource that has been allocated to the third terminal for receiving the D2D communication signal; A first monitoring module, configured to monitor D2D communication signals according to the first resource; A fifth detection module, configured to detect the signal strength of the D2D communication signal monitored according to the first resource, and obtain a first detection result; A second response sending module, configured to send a second response to the base station according to the first detection result, the second response being used to indicate whether the signal strength of the D2D communication signal monitored according to the first resource is less than a predetermined value Intensity threshold. 21. The second terminal according to claim 19, characterized in that, the second terminal further includes: a third instruction receiving module, configured to receive the target resource sent by the base station before the second resource receiving module receives The third instruction sent by the base station includes a second resource, and the second resource is a resource that has been allocated to the fourth terminal for receiving D2D communication signals; A second monitoring module, configured to monitor D2D communication signals according to the second resource; The sixth detection module is used to detect the signal strength of the D2D communication signal monitored according to the second resource, and obtain the second detection result; A third response sending module, configured to send a third response to the base station according to the second detection result, the third response being used to indicate whether the signal strength of the D2D communication signal monitored according to the second resource is less than a predetermined value Intensity threshold. 22. The second terminal, characterized in that, the second terminal includes: a receiver and a processor; the receiver is used to receive target resources sent by the base station, and the target resources are the first terminal received by the base station After sending a request for establishing end-to-end D2D communication with the second terminal, determine reusable resources that can be multiplexed by the first terminal and the second terminal among the allocated D2D resources, and Resources allocated from said reusable resources; The processor is configured to control the receiver to receive the D2D communication signal sent by the first terminal according to the target resource. 23. The second terminal according to claim 22, characterized in that, the second terminal further includes: a transmitter; The receiver is further configured to receive a second instruction containing a first resource sent by the base station before receiving the target resource sent by the base station. The first resource has been allocated to the third terminal for receiving D2D communication. D2D resources of signals; The processor is configured to control the receiver to monitor D2D communication signals according to the first resource; The processor is configured to detect the signal strength of the D2D communication signal monitored according to the first resource, and obtain a first detection result; The processor is configured to control the transmitter to send a second response to the base station according to the first detection result, where the second response is used to indicate a signal of the D2D communication signal monitored according to the first resource. Whether the intensity is less than a predetermined intensity threshold. 24. The second terminal according to claim 22, characterized in that, the second terminal further includes: a transmitter; The receiver is configured to receive a third instruction including a second resource sent by the base station before receiving the target resource sent by the base station. The second resource has been allocated to the fourth terminal for receiving D2D communication signals. H; The processor is used to control the receiver to monitor the D2D communication signal according to the second resource; the processor is used to detect the signal strength of the D2D communication signal monitored according to the second resource, and obtain the second Test results; The processor is configured to control the transmitter to send a third response to the base station according to the second detection result, where the third response is used to indicate a signal of the D2D communication signal monitored according to the second resource. Whether the intensity is less than a predetermined intensity threshold. 25. The third terminal, characterized in that, the third terminal includes: A first instruction receiving module, configured to receive a first instruction sent by the base station, where the first instruction is an instruction sent by the base station after receiving a request sent by the first terminal for establishing D2D communication with the second terminal; A third monitoring module, configured to monitor the discovery signal sent by the first terminal; A seventh detection module, configured to detect the signal quality of the discovery signal monitored by the third listening module, and obtain a third detection result; a first response sending module, configured to send a first response to the base station according to the third detection result; when the first response indicates that the signal quality of the discovery signal monitored by the base station is less than a predetermined quality threshold , sending a second instruction including the first resource to the second terminal, receiving a second response returned by the second terminal, and instructing the second terminal in the second response to use the first resource When the signal strength of the monitored D2D communication signal is less than the predetermined strength threshold, the first resource is determined to be a reusable resource, a target resource is allocated from the reusable resource, and the target resource is sent to The first terminal and the second terminal, the first terminal sends a D2D communication signal according to the target resource, and the second terminal receives the D2D communication signal according to the target resource; Wherein, the first resource is a D2D resource that has been allocated to the third terminal for receiving a D2D communication signal, and the second instruction is used to instruct the second terminal to monitor the D2D communication signal according to the first resource; The second response is used to indicate whether the signal strength of the D2D communication signal monitored by the second terminal according to the first resource is less than the predetermined strength threshold. 26. The third terminal according to claim 25, characterized in that: the first response sending module is configured to send a first response frame including the first response to the base station, and the first response The frame is the first D2D communication frame sent according to the first resource after receiving the first instruction. 27. The third terminal, characterized in that the third terminal includes: a receiver, a processor and a transmitter; The receiver is configured to receive a first instruction sent by the base station, where the first instruction is an instruction sent by the base station after receiving a request sent by the first terminal for establishing D2D communication with the second terminal; The processor is configured to control the receiver to monitor the discovery signal sent by the first terminal; the processor is configured to detect the signal quality of the detected discovery signal and obtain a third detection result; The processor is configured to control the transmitter to send a first response to the base station according to the third detection result; the signal quality of the discovery signal monitored by the base station indicated by the first response is less than When predetermining the quality threshold, sending a second instruction including the first resource to the second terminal, receiving a second response returned by the second terminal, and instructing the second terminal according to the second response. When the signal strength of the D2D communication signal monitored by the first resource is less than a predetermined strength threshold, the first resource is determined to be a reusable resource, a target resource is allocated from the reusable resource, and the target resource is Sent to the first terminal and the second terminal, the first terminal sends a D2D communication signal according to the target resource, and the second terminal receives the D2D communication signal according to the target resource; wherein, The first resource is a D2D resource that has been allocated to the third terminal for receiving a D2D communication signal, and the second instruction is used to instruct the second terminal to monitor the D2D communication signal according to the first resource; The second response is used to indicate whether the signal strength of the D2D communication signal monitored by the second terminal according to the first resource is less than the predetermined strength threshold. 28. The second terminal according to claim 27, characterized in that: the processor is configured to control the transmitter to send a first response frame including the first response to the base station; A response frame is the first D2D communication frame sent according to the first resource after receiving the first instruction. 29. The fourth terminal, characterized in that, the fourth terminal includes: A fourth instruction receiving module, configured to receive a fourth instruction sent by the base station; the fourth instruction is that the base station receives a request sent by the first terminal for establishing D2D communication with the second terminal, and sends the request to the second terminal. The terminal sends a third instruction including the second resource, receives a third response returned by the second terminal, and instructs the second terminal according to the D2D communication signal monitored by the second resource in the third response. An instruction sent when the signal strength is less than a predetermined strength threshold; the second resource is a resource that has been allocated to the fourth terminal for receiving D2D communication signals, and the third instruction is used to instruct the second terminal according to the The second resource monitors the D2D communication signal, and the third response is used to indicate whether the signal strength of the D2D communication signal monitored by the second terminal according to the second resource is less than the predetermined strength threshold; the fourth monitoring module, with Monitoring the discovery signal sent by the first terminal; The eighth detection module is used to detect the signal quality of the detected discovery signal and obtain the fourth detection result; A fourth response sending module, configured to send a fourth response to the base station according to the fourth detection result; the fourth response is used to indicate whether the signal quality of the monitored discovery signal is less than a predetermined quality threshold; When the signal quality of the discovery signal monitored by the fourth response indication is less than the predetermined quality threshold, the base station determines the second resource as a reusable resource and allocates a target from the reusable resource. resources, and sends the target resource to the first terminal and the second terminal, the first terminal sends a D2D communication signal according to the target resource, and the second terminal sends a D2D communication signal according to the target resource. Receive D2D communication signals. 30. The fourth terminal according to claim 29, characterized in that: the fourth response sending module is configured to send a second response frame including the fourth response to the base station, and the second response The frame is the first D2D communication frame sent according to the second resource after receiving the fourth instruction. 31. The fourth terminal, characterized in that the fourth terminal includes: a receiver, a processor and a transmitter; The receiver is configured to receive a fourth instruction sent by the base station; the fourth instruction is for the base station to Receive a request sent by the first terminal for establishing D2D communication with the second terminal, send a third instruction including the second resource to the second terminal, receive the third response returned by the second terminal, and The third response indicates an instruction sent by the second terminal when the signal strength of the D2D communication signal monitored by the second resource is less than a predetermined strength threshold; the second resource is allocated to the fourth terminal. resources to receive D2D communication signals, the third instruction is used to instruct the second terminal to monitor the D2D communication signal according to the second resource, and the third response is used to instruct the second terminal to monitor the D2D communication signal according to the second resource. Whether the signal strength of the D2D communication signal monitored by the resource is less than the predetermined strength threshold; The processor is used to control the receiver to monitor the discovery signal sent by the first terminal; the processor is used to detect the signal quality of the detected discovery signal, and obtain a fourth detection result; The processor is configured to control the transmitter to send a fourth response to the base station according to the fourth detection result; the fourth response is used to indicate whether the signal quality of the monitored discovery signal is less than a predetermined quality. Threshold; When the signal quality of the discovery signal monitored by the fourth response indication is less than the predetermined quality threshold, the base station determines the second resource as a reusable resource, and determines the second resource as a reusable resource. Allocate target resources among the resources, and send the target resources to the first terminal and the second terminal. The first terminal sends a D2D communication signal according to the target resource, and the second terminal sends a D2D communication signal according to the target resource. The target resource receives D2D communication signals. 32. The fourth terminal according to claim 31, characterized in that: the processor is configured to control the transmitter to send a second response frame including the fourth response to the base station; The second response frame is the first D2D communication frame sent according to the second resource after receiving the fourth instruction. 33. A resource allocation method used in a base station, characterized in that the method includes: receiving a request sent by the first terminal for establishing end-to-end D2D communication with the second terminal; among the allocated D2D resources Determine reusable resources that can be multiplexed by the first terminal and the second terminal; Allocate target resources from the reusable resources; The target resource is sent to the first terminal and the second terminal, the first terminal sends a D2D communication signal according to the target resource, and the second terminal receives the D2D communication according to the target resource. Signal. 34. The method according to claim 33, wherein determining the reusable resources that can be multiplexed by the first terminal and the second terminal among the allocated D2D resources includes: The third terminal sends a first instruction, the first instruction is used to instruct the third terminal to monitor the discovery signal sent by the first terminal; Receive a first response returned by the third terminal, where the first response is used to indicate whether the signal quality of the discovery signal monitored by the third terminal is less than a predetermined quality threshold; If the first response indicates that the signal quality of the discovery signal monitored by the third terminal is less than the predetermined quality threshold, then sending a second instruction including the first resource to the second terminal, One resource is a D2D resource that has been allocated to the third terminal for receiving D2D communication signals, and the second instruction is used to instruct the second terminal to monitor D2D communication signals according to the first resource; Receive a second response returned by the second terminal, where the second response is used to indicate whether the signal strength of the D2D communication signal monitored by the second terminal according to the first resource is less than a predetermined strength threshold; if the received If the second response indicates that the signal strength of the D2D communication signal monitored by the second terminal according to the first resource is less than the predetermined strength threshold, then the first resource is determined to be the reusable resource. 35. The method according to claim 34, wherein receiving the first response returned by the third terminal includes: Receive a first response frame including the first response sent by the third terminal, where the first response frame is sent by the third terminal according to the first resource after receiving the first instruction. The first D2D communication frame. 36. The method according to claim 33, wherein determining the reusable resources that can be multiplexed by the first terminal and the second terminal among the allocated D2D resources includes: The second terminal sends a third instruction including a second resource, the second resource is a D2D resource that has been allocated to the fourth terminal for receiving a D2D communication signal; the third instruction is used to instruct the second terminal Monitor D2D communication signals according to the second resource; Receive a third response returned by the second terminal, where the third response is used to indicate whether the signal strength of the D2D communication signal monitored by the second terminal according to the second resource is less than a predetermined strength threshold; if the first The third response indicates that the second terminal monitors the D2D communication signal based on the second resource. If the signal strength of the signal is less than the predetermined strength threshold, a fourth instruction is sent to the fourth terminal, where the fourth instruction is used to instruct the fourth terminal to monitor the discovery signal sent by the first terminal; Receive a fourth response returned by the fourth terminal, where the fourth response is used to indicate whether the signal quality of the discovery signal monitored by the fourth terminal is less than a predetermined quality threshold; If the received fourth response indicates that the signal quality of the discovery signal monitored by the fourth terminal is less than the predetermined quality threshold, the second resource is determined as the reusable resource. 37. The method according to claim 36, wherein receiving the fourth response returned by the fourth terminal includes: Receive a second response frame including the fourth response sent by the fourth terminal, where the second response frame is sent by the fourth terminal according to the second resource after receiving the fourth instruction. The first D2D communication frame. 38. The method according to any one of claims 33 to 37, characterized in that the method further includes: Detect whether the target resources are sufficient after allocating the target resources from the reusable resources; if the detection result is that the target resources are insufficient, detect whether there are idle D2D resources; if the detection result is that there are idle D2D resources, Then the target resource is allocated from the idle D2D resource. 39. The method according to any one of claims 33 to 37, characterized in that, before allocating target resources from the reusable resources, the method further includes: Detect whether there are free D2D resources; If the detection result is that there are idle D2D resources, allocate the target resources from the idle D2D resources; Detect whether the target resource is sufficient after allocating the target resource from the idle D2D resource; If the detection result is that the target resources are insufficient, the step of allocating target resources from the reusable resources is performed. 40. A resource allocation method, used in the first terminal, characterized in that the method includes: Send a request to the base station for establishing end-to-end D2D communication with the second terminal, the request is used to indicate that the base station determines that the allocated D2D resources can be multiplexed by the first terminal and the second terminal. reusable resources, and allocate target resources from the reusable resources; Receive target resources sent by the base station; Send a D2D communication signal to the second terminal according to the target resource. 41. The method according to claim 40, characterized in that the method further includes: periodically sending a discovery signal. 42. A resource allocation method for use in a second terminal, characterized in that the method includes: receiving a target resource sent by a base station, where the target resource is a resource sent by the base station for communication with the first terminal. After the second terminal establishes a request for end-to-end D2D communication, it determines reusable resources that can be multiplexed by the first terminal and the second terminal among the allocated D2D resources, and determines from the reusable resources resources allocated in resources; Receive a D2D communication signal sent by the first terminal according to the target resource. 43. The method according to claim 42, characterized in that, before receiving the target resource sent by the base station, the method further includes: Receive a second instruction including a first resource sent by the base station, where the first resource is a D2D resource that has been allocated to a third terminal for receiving a D2D communication signal; Monitor D2D communication signals according to the first resource; Detect the signal strength of the D2D communication signal monitored according to the first resource, and obtain a first detection result; A second response is sent to the base station according to the first detection result, and the second response is used to indicate whether the signal strength of the D2D communication signal monitored according to the first resource is less than a predetermined strength threshold. 44. The method according to claim 42, characterized in that, before receiving the target resource sent by the base station, the method further includes: Receive a third instruction including a second resource sent by the base station, where the second resource is a resource that has been allocated to the fourth terminal for receiving the D2D communication signal; Monitor D2D communication signals according to the second resource; Detect the signal strength of the D2D communication signal monitored according to the second resource, and obtain a second detection result; Send a third response to the base station according to the second detection result, where the third response is used to indicate whether the signal strength of the D2D communication signal monitored according to the second resource is less than a predetermined strength threshold. 45. A resource allocation method, used in a third terminal, characterized in that the method includes: receiving a first instruction sent by a base station, where the first instruction is a user instruction sent by the base station after receiving it from the first terminal. An instruction sent after a request to establish D2D communication with the second terminal; Monitor the discovery signal sent by the first terminal; Detect the signal quality of the detected discovery signal, and obtain a third detection result; Send a first response to the base station according to the third detection result; when the first response indicates that the signal quality of the detected discovery signal is less than a predetermined quality threshold, the base station sends to the second terminal Containing a second instruction of the first resource, receiving a second response returned by the second terminal, and instructing the second terminal in the second response to a signal of the D2D communication signal monitored by the first resource. When the intensity is less than a predetermined intensity threshold, determine the first resource as a reusable resource, allocate a target resource from the reusable resource, and send the target resource to the first terminal and the second terminal. Terminal, the first terminal sends a D2D communication signal according to the target resource, and the second terminal receives the D2D communication signal according to the target resource; Wherein, the first resource is a D2D resource that has been allocated to the third terminal for receiving a D2D communication signal, and the second instruction is used to instruct the second terminal to monitor the D2D communication signal according to the first resource; The second response is used to indicate whether the signal strength of the D2D communication signal monitored by the second terminal according to the first resource is less than the predetermined strength threshold. 46. The method according to claim 45, wherein sending a first response to the base station according to the third detection result includes: Send a first response frame including the first response to the base station, where the first response frame is the first D2D communication frame sent according to the first resource after receiving the first instruction. 47. A resource allocation method, used in a fourth terminal, characterized in that, the method includes: receiving a fourth instruction sent by a base station; the fourth instruction is a user instruction sent by the base station after receiving it from the first terminal. In response to a request to establish D2D communication with the second terminal, sending a message containing the second information to the second terminal. A third instruction from the source, receiving a third response returned by the second terminal, and indicating in the third response that the signal strength of the D2D communication signal monitored by the second terminal according to the second resource is less than a predetermined strength threshold. an instruction sent when; the second resource is a resource that has been allocated to the fourth terminal for receiving D2D communication signals, and the third instruction is used to instruct the second terminal to monitor D2D communication according to the second resource signal, the third response is used to indicate whether the signal strength of the D2D communication signal monitored by the second terminal according to the second resource is less than the predetermined strength threshold; Monitor the discovery signal sent by the first terminal; Detect the signal quality of the detected discovery signal, and obtain a fourth detection result; Send a fourth response to the base station according to the fourth detection result; the fourth response is used to indicate whether the signal quality of the monitored discovery signal is less than a predetermined quality threshold; the fourth response from the base station When the signal quality of the detected discovery signal is indicated to be less than the predetermined quality threshold, determine the second resource as a reusable resource, allocate a target resource from the reusable resource, and assign the target resource to Sent to the first terminal and the second terminal, the first terminal sends a D2D communication signal according to the target resource, and the second terminal receives the D2D communication signal according to the target resource. 48. The method according to claim 47, wherein sending a fourth response to the base station according to the fourth detection result includes: Send a second response frame including the fourth response to the base station, where the second response frame is the first D2D communication sent according to the second resource after receiving the fourth instruction. frame. 49. A resource allocation system, characterized in that the system includes: The base station according to any one of claims 1 to 14, the first terminal according to any one of claims 15 to 18, the second terminal according to any one of claims 19 to 24, and at least one terminal according to any one of claims 25 to 24. 28 any third terminal and/or at least one fourth terminal according to any one of claims 29 to 32.