WO2018059281A1 - Method, device, and system for random access - Google Patents

Abstract

Embodiments of the present invention relate to the technical field of communications and are capable of reducing the delay in a random access process for a terminal. Provided are a method, device, and system for random access. The method comprises: a terminal transmits a first preamble to a first base station, the first preamble being used by the terminal for requesting the first base station for random access; the terminal transmits a second preamble to a second base station, the second preamble being used by the terminal for requesting the second base station for random access; the terminal receives success response information transmitted by the first base station, the success response information being used for indicating that the terminal successfully accessed at least one of the first base station and the second base station, the success response information comprising access information assigned to the terminal by the base station successfully accessed by the terminal, and the access information being used by the terminal in transmitting uplink data to the base station successfully accessed by the terminal. The method is applicable in a random access process.

Description

Random access method, device and system

The present application claims priority to Chinese Patent Application No. 201610877941.2, entitled "A Random Access Method, Apparatus and System", filed on September 30, 2016, the entire contents of which are incorporated herein by reference. In this application.

Technical field

The present invention relates to the field of communications technologies, and in particular, to a random access method, apparatus, and system.

Background technique

In the Long Term Evolution (LTE) system, the terminal can perform uplink transmission only after performing uplink synchronization with the base station, and uplink synchronization is usually performed through a random access procedure. Random access in LTE is divided into two modes: "competition based" and "non-competitive". Non-competitive random access is implemented in the process of the terminal switching between cells. The initial access of the terminal generally adopts a contention-based mode.

In a contention-based random access procedure, the terminal usually needs to perform a four-step handshake with the base station to complete. The first step: the terminal sends a preamble (Preamble) to the base station through a physical random access channel (PRACH); the second step: after detecting the preamble sent by the terminal, the base station calculates the uplink of the terminal. Time Advanced (TA), and the TA, the uplink grant (UL Grant), and the information of the Cell Radio Network Temporary Identifier (C-RNTI) allocated by the base station to the terminal. As a random access response (RAR), the terminal feeds back to the terminal; the third step: after receiving the RAR, the terminal sends an uplink message to the specified resource location on the uplink; and in the fourth step, the base station receives the uplink message. After that, a conflict resolution message will be sent to the terminal. If the identifier information carried in the conflict resolution message is the same as the identifier information in the uplink message, the terminal completes the random access procedure. If it is different, it indicates that there is a conflict between the terminal and other terminals. If the random access fails, the terminal repeats the processes of the first to fourth steps until the random access succeeds.

However, since the number of preambles and the number of PRACH resources in each base station are limited, when there are a large number of terminals, there may be a phenomenon in which multiple terminals transmit the same preamble in the same PRACH resource, that is, there is a collision between terminals. conflict. After the uplink message of the terminal cannot be detected by the base station after the collision, the terminal needs to repeatedly try the above process until the random access succeeds. In the provisions of the 3rd Generation Partnership Project (3GPP) protocol, each attempt requires a backoff of about 10ms. Therefore, such repeated attempts and rollbacks may result in relatively large delays, thereby failing to meet the demand for delay sensitive services in 5G systems.

Summary of the invention

Embodiments of the present invention provide a random access method, apparatus, and system, which can reduce the collision probability between terminals and reduce the delay of the terminal performing a random access procedure.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

In a first aspect, an embodiment of the present invention provides a random access method, where the method includes: the terminal is first The base station sends a first preamble, where the first preamble is used by the terminal to request random access to the first base station; the terminal sends a second preamble to the second base station, where the second preamble is used by the terminal to the terminal The second base station requests random access; the terminal receives the success response information sent by the first base station, and the success response message is used to indicate that the terminal successfully accesses at least one of the first base station and the second base station, the success response information The base station that is successfully accessed by the terminal is the access information allocated by the terminal, and the access information is used by the terminal to send uplink data to the base station that the terminal successfully accesses.

With the random access method provided by the embodiment of the present invention, the terminal may request random access to the first base station and the second base station at the same time, as long as the terminal successfully accesses any one of the first base station and the second base station, the terminal can The random access procedure is performed to perform uplink data transmission. Compared with the manner in which the terminal requests random access to a base station in the traditional LTE system, the random access method provided by the embodiment of the present invention reduces the occurrence of the terminal in the random access process. The probability of collision collision improves the success rate of the terminal to perform random access, thereby reducing the delay of the terminal in performing the random access procedure. In one design, the number of the first preamble is N, N>1, and N is an integer. Before the terminal sends the first preamble to the first base station, the method further includes: the terminal receiving the first base station to send a first sparse codebook based on non-orthogonal multiple access, the first sparse codebook is used by the terminal to send N first preambles to the first base station; the terminal sends a first preamble to the first base station, including The terminal sends the N first preambles to the first base station by using the first sparse codebook.

In one design, the number of the first preambles is N, and before the terminal sends the first preamble to the first base station, the method further includes: acquiring, by the terminal, a first power weight based on non-orthogonal multiple access, where The first power weight is used by the terminal to send the N first preambles to the first base station; the terminal sends the first preamble to the first base station, where the terminal sends the first base station to the first base station by using the first power weight N first preambles.

In one design, the number of the first preambles is N, and the terminal sends the first preamble to the first base station, where the terminal sends the N first preambles to the first base station by using multiple transmit antennas.

In the above three possible designs, the terminal is configured to send more than one first preamble to the first base station without increasing transmission resources (for example, PRACH resources) by using a non-orthogonal multiple access method or a MIMO technology, so that the terminal can The random access provided by the embodiment of the present invention is provided by the method that the first base station sends the first preamble to the first base station to request the random access. In the traditional LTE system, the terminal sends a preamble to the base station to request the random access. The method can reduce the probability that multiple terminals send the same first preamble on the same time-frequency resource, thereby further reducing the probability of collision collision of the terminal in the random access process, and reducing the random access process of the terminal. Delay.

In one design, the number of the second preamble is M, M>1, and M is an integer. Before the terminal sends the second preamble to the second base station, the method further includes: the terminal receiving the second base station to send a second sparse codebook based on non-orthogonal multiple access, the second sparse codebook is used by the terminal to send M second preambles to the second base station; the terminal sends a second preamble to the second base station, including The terminal sends the M second preambles to the second base station by using the second sparse codebook.

In one design, the number of the second preambles is M, and before the terminal sends the second preamble to the second base station, the method further includes: the terminal acquiring a second power weight based on the non-orthogonal multiple access, where The second power weight is used by the terminal to send the M second preambles to the second base station; the terminal sends the second preamble to the second base station, where the terminal sends the second base station to the second base station by using the second power weight M second preambles.

In one design, the number of the second preamble is M, and the terminal sends the second preamble to the second base station. The method includes: the terminal transmitting, by using multiple transmit antennas, M second preambles to the second base station.

In the above three possible designs, the non-orthogonal multiple access mode or the MIMO technology is implemented to enable the terminal to send more than one second preamble to the second base station without increasing transmission resources (for example, PRACH resources), so that the terminal can The random access provided by the embodiment of the present invention is provided by the method of sending the first preamble to the second base station to request the random access. In the traditional LTE system, the terminal sends a preamble to the base station to request random access. The method can reduce the probability that multiple terminals send the same second preamble on the same time-frequency resource, thereby further reducing the probability of collision collision of the terminal in the random access process, and reducing the random access process of the terminal. Delay.

In a second aspect, the embodiment of the present invention provides a random access method, where the method includes: receiving, by a first base station, a first preamble sent by a terminal, where the first preamble is used by the terminal to request random access to the first base station The first base station attempts to allocate the first access information to the terminal according to the first preamble, where the first access information is used by the terminal to send uplink data to the first base station; the first base station sends the uplink information to the terminal successfully. The response information includes at least one of the first access information and the second access information, where the second access information is access information corresponding to the terminal sent by the second base station, and the second The access information is used by the terminal to send uplink data to the second base station.

According to the random access method provided by the embodiment of the present invention, the first base station may send the success response information to the terminal, so that the terminal completes the random connection, as long as the terminal successfully determines that the terminal successfully accesses any one of the first base station and the second base station. In the process of performing the uplink data transmission, the random access method provided by the embodiment of the present invention reduces collision collision of the terminal in the random access process, compared to the manner in which the terminal requests the random access to the one base station in the traditional LTE system. The probability increases the success rate of the terminal for random access, thereby reducing the delay of the terminal performing the random access process.

In one design, the number of the first preambles is N, N>1, and N is an integer. The first base station attempts to allocate the first access information to the terminal according to the first preamble, including: the first The base station attempts to allocate the first access information to the terminal according to the N first preambles.

In this possible design, the first base station may send more than one first preamble to perform random access by using the receiving terminal, and the manner in which the terminal sends only one preamble to the base station to request random access in the traditional LTE system is compared. The random access method provided by the embodiment of the present invention can reduce the probability that the first base station receives the same first preamble by multiple terminals on the same time-frequency resource, thereby further reducing the collision of the terminal in the random access process. The probability of collision reduces the delay of the terminal performing the random access procedure.

In a design, before the first base station receives the first preamble sent by the terminal, the method further includes: the first base station assigning, to the terminal, a first sparse codebook based on non-orthogonal multiple access; the first base station The terminal sends the first sparse codebook, so that the terminal sends the N first preambles to the first base station by using the first sparse code; the first base station receives the first preamble sent by the terminal, including: A base station receives the N first preambles sent by the terminal according to the first sparse codebook.

In a design, before the first base station receives the first preamble sent by the terminal, the method further includes: the first base station determining a first power weight based on the non-orthogonal multiple access, where the first power weight is used for the first Receiving, by the base station, the N first preambles sent by the terminal; the first base station receiving the first preamble sent by the terminal, the first base station receiving, according to the first power weight, the N first preambles sent by the terminal code.

In a design, the first base station receives the first preamble sent by the terminal, and includes: the first base station The plurality of receiving antennas receive the N first preambles transmitted by the terminal.

In the above three possible designs, the first base station does not increase the transmission resource (for example, the PRACH resource) by using the non-orthogonal multiple access mode or the MIMO technology, and the receiving terminal sends more than one first preamble. In the traditional LTE system, the base station sends a preamble to each terminal to perform random access, and the first base station receives the method that the terminal sends one or more first preambles for random access, which can reduce the first base station at the same time. The probability of receiving the same first preamble by multiple terminals is received on the frequency resource, thereby reducing the probability of collision collision of the terminal in the random access process, and reducing the delay of the terminal performing the random access procedure.

In a design, if the first base station fails to allocate the first access information to the terminal, and the first base station does not receive the second access information sent by the second base station, the method further includes: the first base station The terminal sends a failure response message, where the failure response message is used to indicate that the random access requested by the terminal to the first base station and the second base station fails.

In a third aspect, the embodiment of the present invention provides a random access method, where the method includes: receiving, by a second base station, a second preamble sent by a terminal, where the second preamble is used by the terminal to request random access to the second base station The second base station allocates second access information to the terminal according to the second preamble, where the second access information is used by the terminal to send uplink data to the second base station; and the second base station sends the second base station to the first base station. The second access information is such that the first base station sends the second access information to the terminal.

According to the random access method provided by the embodiment of the present invention, the second base station can perform a random access procedure according to the second preamble sent by the terminal, and send the second access information to the first base station, so that the first When the base station determines that the terminal successfully accesses any one of the first base station and the second base station, it sends a success response message to the terminal, so that the terminal completes the random access procedure and performs uplink data transmission, compared to the traditional LTE system. The method for requesting a random access by a terminal to a base station, which reduces the probability of a collision of a terminal in a random access process, improves the success rate of random access by the terminal, and further reduces the terminal. The delay of the random access process.

In one design, the number of the second preamble is M, M>1, and M is an integer. The second base station allocates second access information to the terminal according to the second preamble, including: the second base station according to M The second preamble assigns the second access information to the terminal.

In this possible design, the second base station may perform random access by transmitting, by the receiving terminal, one or more second preambles, compared to the manner in which the terminal sends only one preamble to the base station to request random access in the traditional LTE system. The probability that the second base station receives the same second preamble by multiple terminals on the same time-frequency resource can be reduced, thereby further reducing the probability of collision collision of the terminal in the random access process, and reducing the randomness of the terminal. The delay of the access process.

In one design, before the second base station receives the second preamble sent by the terminal, the method further includes: the second base station determining a second power weight based on the non-orthogonal multiple access, where the second power weight is used for the first Receiving, by the base station, the M second preambles sent by the terminal; the second base station receiving the second preamble sent by the terminal, the second base station receiving, according to the second power weight, the M second preambles sent by the terminal code.

In a design, before the second base station receives the second preamble sent by the terminal, the method further includes: the second base station assigning, to the terminal, a second sparse codebook based on non-orthogonal multiple access; the second base station Transmitting, by the terminal, the second sparse codebook, so that the terminal sends the M numbers to the second base station by using the second sparse code The second preamble is received by the second base station, and the second base station receives the M second preambles sent by the terminal according to the second sparse codebook.

In a design, the second base station receives the second preamble sent by the terminal, and the second base station receives the M second preambles sent by the terminal by using multiple receiving antennas.

In the above three possible designs, the second base station does not increase the transmission resource (for example, the PRACH resource) by using the non-orthogonal multiple access mode or the MIMO technology, and the receiving terminal sends more than one second preamble. In the traditional LTE system, the base station sends a preamble to each terminal to perform random access, and the second base station receives the method that the terminal sends more than one second preamble for random access, which can reduce the second base station at the same time. The probability of receiving the same second preamble by multiple terminals is received on the frequency resource, thereby reducing the probability of collision collision of the terminal in the random access process, and reducing the delay of the terminal performing the random access procedure.

In a fourth aspect, the embodiment of the present invention provides a terminal, including: a sending unit, configured to send a first preamble to a first base station, where the first preamble is used by the terminal to request random access to the first base station; The sending unit is further configured to send a second preamble to the second base station, where the second preamble is used by the terminal to request random access to the second base station, and the receiving unit is configured to receive the success response information sent by the first base station The success response message is used to indicate that the terminal successfully accesses at least one of the first base station or the second base station, and the success response information includes access information allocated by the base station successfully accessed by the terminal for the terminal. The information is used by the terminal to send uplink data to the base station that the terminal successfully accesses.

In one design, the number of the first preamble is N, N>1, and N is an integer, and the receiving unit is further configured to receive, before sending the first preamble to the first base station, the first base station sends the first preamble. The first sparse codebook is used to send the N first preambles by using the first sparse codebook, and the sending unit sends the first preamble to the first base station, which includes: adopting the first sparse codebook The first sparse codebook sends the N first preambles to the first base station.

In one design, the number of the first preambles is N, and the sending unit is further configured to acquire a first power weight based on the non-orthogonal multiple access before sending the first preamble to the first base station, where a power weight is used by the sending unit to send the N first preambles to the first base station, and the sending unit sends the first preamble to the first base station, where the sending unit sends the first base station to the first base station by using the first power weight. N first preambles.

In one design, the number of the first preambles is N, and the sending unit sends the first preamble to the first base station, specifically: sending, by using multiple transmit antennas, N first preambles to the first base station. code.

In one design, the number of the second preamble is M, M>1, and M is an integer. The receiving unit is further configured to receive the second preamble before the sending unit sends the second preamble to the second base station. a second sparse codebook based on non-orthogonal multiple access, where the second sparse codebook is used by the sending unit to send M second preambles to the second base station; the sending unit sends the second base station to the second base station The second preamble includes: sending the M second preambles to the second base station by using the second sparse codebook.

In one design, the number of the second preamble is M, and the sending unit is further configured to obtain a second power weight based on the non-orthogonal multiple access before sending the second preamble to the second base station, where the second The power weight is used by the sending unit, and the second base station sends the M second preambles. The sending unit sends the second preamble to the second base station, where the sending unit sends the M to the second base station by using the second power weight. Second preamble.

In one design, the number of second preambles is M, and the transmitting unit sends the second preamble to the second base station. The pilot code specifically includes: sending, by using multiple transmit antennas, M second preambles to the second base station.

For technical effects of the terminal provided by the embodiment of the present invention, reference may be made to the technical effects of the foregoing first aspect or the various optional manners of the first aspect, and details are not described herein again.

In a fifth aspect, the embodiment of the present invention provides a base station, including: a receiving unit, configured to receive a first preamble sent by a terminal, where the first preamble is used by the terminal to request random access to the base station; The first preamble received by the receiving unit is used to allocate first access information, where the first access information is used by the terminal to send uplink data to the base station, and the sending unit is configured to send the terminal to the terminal successfully. Response information, the success response information includes at least one of first access information allocated by the allocating unit and second access information received by the receiving unit, where the second access information is sent by the second base station to the terminal Corresponding access information, the second access information is used by the terminal to send uplink data to the second base station.

In one design, the number of the first preamble is N, N>1, and N is an integer. The allocation unit attempts to allocate the first access information to the terminal according to the first preamble, and specifically includes: The first preamble is an attempt by the terminal to allocate the first access information.

In one design, the allocating unit is further configured to allocate a first sparse codebook based on non-orthogonal multiple access to the terminal before the receiving unit receives the first preamble sent by the terminal; the sending unit is further configured to The terminal sends the first sparse codebook, so that the terminal sends the N first preambles to the base station by using the first sparse code; the receiving unit receives the first preamble sent by the terminal, and specifically includes: according to the first sparse code The codebook receives the N first preambles sent by the terminal.

In a design, the base station further includes a determining unit, configured to determine a first power weight based on the non-orthogonal multiple access, the first power weight, before the receiving unit receives the first preamble sent by the terminal The receiving unit receives the N first preambles sent by the terminal; the receiving unit receives the first preamble sent by the terminal, and specifically includes: receiving the N sent by the terminal according to the first power weight determined by the determining unit First preamble.

In a design, the receiving unit receives the first preamble sent by the terminal, and specifically includes: receiving, by using multiple receiving antennas, N first preambles sent by the terminal.

In a design, if the allocating unit fails to allocate the first access information to the terminal, and the receiving unit does not receive the second access information sent by the second base station, the sending unit is further configured to send a failure response message to the terminal. The failure response message is used to indicate that the random access requested by the terminal to the base station and the second base station fails.

For technical effects of the base station provided by the embodiment of the present invention, refer to the technical effects of the foregoing second aspect or the optional manner of the second aspect, and details are not described herein again.

In a sixth aspect, an embodiment of the present invention provides a base station, including:

a receiving unit, configured to receive a second preamble sent by the terminal, where the second preamble is used by the terminal to request random access from the base station, and an allocating unit, configured to use the second preamble received by the receiving unit as the terminal Allocating the second access information, the second access information is used by the terminal to send the uplink data to the base station, and the sending unit is configured to send the second access information allocated by the allocating unit to the first base station, so that the The first base station sends the second access information to the terminal.

In one design, the number of the second preamble is M, M>1, and M is an integer. The allocation unit allocates the second access information to the terminal according to the second preamble, and specifically includes: Second preamble The second access information is allocated to the terminal.

In a design, the base station further includes a determining unit, configured to determine a second power weight based on the non-orthogonal multiple access, the second power weight, before the receiving unit receives the second preamble sent by the terminal The receiving unit receives the M second preambles sent by the terminal, and the receiving unit receives the second preamble sent by the terminal, where the method includes: receiving, according to the second power weight, the M second preambles sent by the terminal. .

In a design, the allocating unit is further configured to allocate a second sparse codebook based on non-orthogonal multiple access to the terminal before the receiving unit receives the second preamble sent by the terminal; the sending unit is further configured to The terminal sends the second sparse codebook, so that the terminal sends the M second preambles to the base station by using the second sparse code; the receiving unit receives the second preamble sent by the terminal, and specifically includes: according to the second sparse code The codebook receives the M second preambles sent by the terminal.

In a design, the receiving unit receives the second preamble sent by the terminal, and specifically includes: receiving, by the multiple receiving antennas, the M second preambles sent by the terminal.

For technical effects of the base station provided by the embodiment of the present invention, reference may be made to the technical effects of the foregoing optional aspects of the third aspect or the third aspect, and details are not described herein again.

In one design, in the first aspect or the fourth aspect, the number of the first preambles is N, and/or the number of the second preambles is M.

In a seventh aspect, the embodiment of the present invention provides a terminal, where the terminal can implement the functions performed by the terminal in the method embodiment of the foregoing first aspect, where the function can be implemented by using hardware or by executing corresponding software through hardware. achieve. The hardware or software includes one or more modules corresponding to the above functions.

In one possible design, the structure of the terminal includes a processor and a transceiver configured to support the terminal to perform corresponding functions in the above methods. The transceiver is used to support communication between the terminal and other network elements. The terminal can also include a memory for coupling with the processor that retains the program instructions and data necessary for the terminal.

According to an eighth aspect, an embodiment of the present invention provides a readable medium, including a computer executing instruction, when the processor of the terminal executes the computer to execute an instruction, the terminal performs any one of the foregoing first aspect or the first aspect. The random access method described in the implementation manner.

For technical effects of the terminal provided by the embodiment of the present invention, reference may be made to the technical effects of the foregoing first aspect or the various optional manners of the first aspect, and details are not described herein again.

A ninth aspect, the embodiment of the present invention provides a base station, where the base station can implement the functions performed by the base station in the method embodiment of the second aspect, where the function can be implemented by using hardware or by executing corresponding software through hardware. achieve. The hardware or software includes one or more modules corresponding to the above functions.

In one possible design, the base station includes a processor and a transceiver configured to support the base station to perform the corresponding functions of the above methods. The transceiver is used to support communication between the base station and other network elements. The base station can also include a memory for coupling with the processor that holds the necessary program instructions and data for the base station.

According to a tenth aspect, an embodiment of the present invention provides a readable medium, including a computer executing instruction, when the processor of a base station executes the computer to execute an instruction, the base station performs any one of the foregoing second aspect or the second aspect. The random access method described in the implementation manner.

For technical effects of the base station provided by the embodiment of the present invention, refer to the technical effects of the foregoing second aspect or the optional manner of the second aspect, and details are not described herein again.

In an eleventh aspect, the embodiment of the present invention provides a base station, where the base station can implement the functions performed by the base station in the method embodiment of the foregoing third aspect, where the function can be implemented by using hardware or by using hardware. Software Implementation. The hardware or software includes one or more modules corresponding to the above functions.

In one possible design, the base station includes a processor and a transceiver configured to support the base station to perform the corresponding functions of the above methods. The transceiver is used to support communication between the base station and other network elements. The base station can also include a memory for coupling with the processor that holds the necessary program instructions and data for the base station.

According to a twelfth aspect, the embodiment of the present invention provides a readable medium, including computer execution instructions, when the processor of the base station executes the computer to execute an instruction, the base station performs any one of the foregoing third aspect or the third aspect. A random access method as described in the implementation.

For technical effects of the base station provided by the embodiment of the present invention, refer to the technical effects of the foregoing second aspect or the optional manner of the second aspect, and details are not described herein again.

A thirteenth aspect, the embodiment of the present invention provides a communication system, comprising: the terminal according to any one of the fourth aspect or the fourth aspect, or the fifth aspect or the fifth aspect a base station as described in a possible design, and a base station as described in the sixth aspect or any of the possible aspects of the sixth aspect; or, as in any of the seventh aspect or the seventh aspect The terminal described in the design, the base station as described in the ninth aspect or any of the possible designs of the ninth aspect, and the possible design in any one of the eleventh or eleventh aspects The base station.

DRAWINGS

1 is a schematic structural diagram of a communication system according to an embodiment of the present invention;

2 is a schematic structural diagram 1 of a base station according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram 1 of a terminal according to an embodiment of the present disclosure;

FIG. 4 is an interaction diagram of a random access method according to an embodiment of the present invention;

FIG. 5 is a first schematic diagram of a transmission method of a power domain based NOMA technology according to an embodiment of the present disclosure;

FIG. 6 is a second schematic diagram of a transmission method of a power domain based NOMA technology according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of a multi-antenna based transmission method according to an embodiment of the present invention; FIG.

FIG. 8 is an interaction diagram of another random access method according to an embodiment of the present invention;

9A is a schematic structural diagram 1 of a terminal according to an embodiment of the present invention;

FIG. 9B is a schematic structural diagram 2 of a terminal according to an embodiment of the present disclosure;

9C is a schematic structural diagram 3 of a terminal according to an embodiment of the present invention;

10A is a schematic structural diagram 1 of a first base station according to an embodiment of the present invention;

FIG. 10B is a schematic structural diagram 2 of a first base station according to an embodiment of the present disclosure;

FIG. 10C is a schematic structural diagram 3 of a first base station according to an embodiment of the present disclosure;

FIG. 11 is a schematic structural diagram 1 of a second base station according to an embodiment of the present disclosure;

FIG. 11B is a second schematic structural diagram of a second base station according to an embodiment of the present disclosure;

FIG. 11C is a schematic structural diagram 3 of a second base station according to an embodiment of the present invention.

detailed description

The random access method provided by the embodiment of the present invention can be applied to a communication system as shown in FIG. 1, including a terminal, and at least two base stations that provide services for the terminal. Illustratively, in the embodiment of the present invention, a random access method provided by an embodiment of the present invention is described by taking two base stations as an example. For convenience of description, the two base stations are referred to as a first base station and a second base station, respectively.

The first base station and the second base station may be a Macro Base Station (MBS), or may be a Small Base Station (SBS). In the embodiment of the present invention, the MBS may be a central control node, for example, an RNC in a 3G system, an eNodeB in a LTE, or a macro base station, or another transmission node having a line backhaul function. The SBS may be a Femto base station in a 4G system, a Pico base station, an Access Point in a WiFi system, or other functional entity having network access for the user.

As shown in FIG. 2, a base station, a processor, a memory, a transceiver, and a bus are provided according to an embodiment of the present invention.

The bus is used to connect the processor, the memory, and the transceiver, and implement data transfer between the processor, the memory, and the transceiver. The transceiver passes the antenna method data, the processor receives the command from the transceiver through the bus, decrypts the received command, performs calculation or data processing according to the decrypted command, and transmits the processed data from the transceiver to other devices through the bus. The memory includes program modules, data modules, and the like. The program modules may be composed of software, firmware, hardware, or at least two of them. The transceiver is used to connect the base station with a network element node such as a base station and a terminal, and a network. For example, the transceiver can be connected to the network through a wireless connection to connect to other external network element nodes.

The terminal can be a mobile device that can be portable, pocket, handheld, computer built-in or in-vehicle, or a personal communication service (PCS) phone, a laptop, a touch screen computer, a cordless phone, a wireless local loop ( WLL, Wireless Local Loop) Station, Personal Digital Assistant (PDA), Mobile Station, Mobile, Remote Station, Access Point, Remote Terminal ( Remote Terminal), Access Terminal, User Terminal, User Agent, User Device, or User Equipment.

As shown in FIG. 3, a terminal provided by an embodiment of the present invention includes a processor, a memory, an RF circuit, and the like.

Wherein, the processor is a control center of the terminal, and connects various parts of the entire terminal by using various interfaces and lines, and executes by executing or executing software programs and/or modules stored in the memory, and calling data stored in the memory. The terminal's various functions and processing data, so as to monitor the terminal as a whole. The processor may include digital signal processor devices, microprocessor devices, analog to digital converters, digital to analog converters, etc., which are capable of distributing the control and signal processing functions of the terminal in accordance with their respective capabilities. The RF circuit can be used to send and receive information and process the received information to the processor. Generally, RF circuits include, but are not limited to, an antenna, at least one amplifier, a transceiver, a coupler, an LNA (low noise amplifier), a duplexer, etc., and communicate with other devices through a wireless communication network. The wireless communication may use any communication standard or protocol, including but not limited to a global system of mobile communication (GSM), a general packet radio service (GPRS), and code division multiple access ( Code division multiple access, CDMA), wideband code division multiple access (WCDMA), LTE (long term evolution, long term evolution), WiFi or low power WiFi, and WLAN technology.

Based on the communication system shown in FIG. 1 , as shown in FIG. 4 , an embodiment of the present invention provides a random access method, where the method may include:

S101. The terminal sends a first preamble to the first base station, where the first preamble is used by the terminal to request random access to the first base station.

In the embodiment of the present invention, the terminal may randomly select the first preamble from the first preamble set broadcast by the first base station, and send the first preamble to the first base station by using the PRACH to request random connection to the first base station. In.

The first preamble may be a ZC (Zadoff-Chu) sequence, and the first base station may generate the first preamble by using the following formula (1):

Where K is called the root index, and n can take 0 to N _ZC -1 for a total of N _ZC different values. Different ZC root sequences are obtained by taking different K values, so that the first base station obtains the first preamble by cyclically shifting the ZC root sequence.

In an example, the terminal may also randomly select N first preambles from the first preamble set broadcast by the first base station, and send the N first preambles to the first base station by using the PRACH to the first base station. Request random access. Where N>1 and N are integers.

Further, in the embodiment of the present invention, the terminal may send N first preambles to the first base station in multiple manners.

Exemplarily, N first preambles may be transmitted on the PRACH by using a non-orthogonal multiple access (NOMA) method between the terminal and the first base station.

In an example, N first preambles may be transmitted on the PRACH using a power domain based NOMA technique between the terminal and the first base station. Specifically, before the terminal sends the N first preambles to the first base station, the terminal needs to acquire the first power weight based on the NOMA, and the terminal can send the first power weight to the first base station by using the first power weight. N first preambles, correspondingly, the first base station simultaneously receives the N first preambles according to the first power weight.

The manner in which the terminal obtains the first power weight may be multiple. For example, when the first base station uses the scheduling mode of Frequency Division Duplexing (FDD) for communication resource scheduling, since the channel for transmitting uplink data and the channel for transmitting downlink data are different channels in the scheduling mode of FDD, Therefore, if the first power weight used by the terminal to transmit the N first preambles (uplink data) to the first base station is required, the first base station needs to measure the uplink measurement signal sent by the terminal, and obtain the first A power weight is sent to the terminal.

When the first base station uses the scheduling mode of Time Division Duplexing (TDD) to perform communication resource scheduling, since the uplink data and the downlink data are transmitted on the same channel in the scheduling mode of the TDD, the terminal can directly The downlink data sent by the first base station is measured, and the first power weight is obtained. The first base station may also determine the first power weight directly by measuring the uplink data sent by the terminal.

In this example, the spectral efficiency of the PRACH is improved by the power domain based NOMA technology. Therefore, when the terminal sends two or more first preambles to the first base station, as long as one of the first preambles sent by the terminal is different from the preamble sent by other terminals, the terminal does not Collision conflicts with other terminals. Exemplarily, as shown in FIG. 5, it is assumed that the terminal 1 determines to use the preamble 1, the preamble 2, and the preamble 3 to request random access to the first base station, and the terminal 2 determines to use the preamble 1, the preamble 2, and the preamble. 4 requesting random access to the first base station, when the terminal 1 and the terminal 2 request random access to the first base station, the preamble selected by the terminal 1 and the preamble selected by the terminal 2 pass different power weights in a linear superposition manner. Transmitted to the first base station on the same time-frequency resource. The first base station may receive the preamble 1, the preamble 2, and the preamble 3 from the time-frequency resource according to the power weight corresponding to the terminal 1, and the first base station according to the power weight corresponding to the terminal 2, from the time-frequency resource. The preamble 1, the preamble 2, and the preamble 4 are received. Since the preamble 3 in the request information 1 is different from the preamble 4 in the request information 2, the preambles transmitted by the terminal 1 and the terminal 2 on the same time-frequency resource are not the same, and thus, the terminal 1 and the terminal 2 There is no collision conflict between them.

The method for transmitting the N first preambles by using the first power weight of the NOMA is used by the terminal, and the method for transmitting the uplink data by the sending end according to the corresponding power weight in the NOMA mode according to the prior art; the first base station is based on the NOMA-based method. For the manner in which the first power is received by the first power preamble, refer to the manner in which the receiving end receives the uplink data corresponding to the power weight in the NOMA mode according to the corresponding power weight, and details are not described herein again.

It can be understood that, in this example, the power domain-based NOMA technology enables the terminal to send more than one first preamble to the first base station on the PRACH without requesting the transmission resource to request random access. Requesting, thereby reducing the probability that the terminal and the other terminal transmit the same preamble on the same time-frequency resource, that is, reducing the probability of collision collision of the terminal in the random access process, thereby reducing the random access of the terminal The delay caused.

In an example, the first preamble is transmitted on the PRACH by using a Sparse Code Multiple Access (SCMA) technology, and the SCMA technology is a code domain based NOMA technology. The spectrum efficiency of the system can be effectively improved. Therefore, the terminal can send N first preambles to the first base station without increasing transmission resources. Specifically, before the terminal sends the N first preambles to the first base station, the first base station needs to allocate a first sparse codebook based on the NOMA to the terminal, and send the first sparse codebook to the terminal, so that The terminal sends the N first preambles to the first base station by using the first sparse codebook, and the first base station simultaneously receives the N first preambles according to the first sparse codebook.

In the embodiment of the present invention, the first base station may allocate a different first sparse codebook to each terminal, and each first sparse codebook has multiple codewords, and each codeword corresponds to one data bit (bit). )combination. Assume that the length of the codeword is K, and the number of blank RB resources in each codeword is N, and N<K. Since different terminals use different first sparse codebooks, the first base station uses a Message Passing Algorithm (MPA) for blind detection and decoding, so the SCMA technology has high user multiplexing. Exemplarily, as shown in FIG. 6, based on the SCMA technology, eight terminals can share six RB resources of one PRACH when transmitting the preamble. The terminal 1 uses the first two RB resources in the codeword to store the preamble 1 and the preamble 2 selected by the terminal 1. The blank RB resource is the last six, and the terminal 2 uses the last two RB resources in the codeword to store. The preamble 3, the preamble 4, and the like selected by the terminal 2. It can be seen from FIG. 6 that the RB resources used by different users are different because the blank RB resources are different. Therefore, the preambles of the eight terminals are not sent on the same time-frequency resource. collision.

It can be understood that, by using the SCMA technology, the terminal can send more than one first preamble to the first base station to perform a random access request, and reduce the probability that the terminals send the same preamble on the same time-frequency resource, that is, The probability of collision collision of the terminal in the random access process is reduced, thereby reducing the delay caused by the terminal performing random access.

The method for transmitting the N first preambles by using the first sparse codebook based on the NOMA is used by the terminal, and the manner in which the sending end sends the uplink data according to the corresponding sparse codebook in the NOMA manner is used in the prior art; For the manner in which the first sparse codebook of the NOMA receives the N first preambles, refer to the manner in which the receiving end receives the uplink data corresponding to the sparse codebook according to the corresponding sparse codebook according to the corresponding sparse codebook. Let me repeat.

Optionally, in the embodiment of the present invention, the N first preambles are sent by using multiple antennas based on millimeter waves (mmWave), that is, the terminal and the first base station may also pass multiple inputs. The Multiple-Input Multiple-Output (MIMO) technique transmits N first preambles. Specifically, the terminal sends N first preambles on the PRACH to the first base station by using multiple transmit antennas, and the first base station also receives the N first preambles on the PRACH through multiple receive antennas. Exemplarily, as shown in FIG. 7, when the terminal 1 transmits the preamble 1, the preamble 2, and the preamble 3 to the first base station to request random access to the first base station, the three preambles may be in the same The three transmit antennas of the time-frequency resource are transmitted. For example, the preamble 1 is transmitted on the transmit antenna 1, the preamble 2 is transmitted on the transmit antenna 2, and the preamble 2 is transmitted on the transmit antenna 3.

It can be understood that, in the optional, by using the MIMO technology, the terminal can send two or more first preambles to the first base station to perform a random access request, thereby reducing the terminal being the same as the other terminals. The probability of transmitting the same preamble on the time-frequency resource reduces the probability of collision collision of the terminal in the random access process, thereby reducing the delay caused by the terminal performing random access.

S102. The terminal sends a second preamble to the second base station, where the second preamble is used by the terminal to request random access from the second base station.

In the embodiment of the present invention, the terminal may also randomly select the second preamble from the second preamble set broadcasted by the second base station, and send the second preamble to the second base station to request random access to the second base station.

Optionally, in the embodiment of the present invention, the terminal may also randomly select M second preambles from the second preamble set broadcasted by the second base station, and send the second preamble to the second base station to request random access to the second base station. Where M>1 and M are integers.

Specifically, the manner in which the second base station generates the second preamble is the same as the manner in which the first base station generates the first preamble, and details are not described herein again.

Further, refer to the manner in which the terminal sends N first preambles to the first base station, and the terminal may also send M second preambles to the second base station in the same manner.

For example, the power domain-based NOMA technology may be used between the terminal and the second base station to transmit M second preambles on the PRACH. Specifically, before the terminal sends the M second preambles to the second base station, the terminal first acquires the second power weight based on the NOMA, and the terminal can send the M to the second base station by using the second power weight. Second preamble. Correspondingly, the second base station receives the M second preambles according to the second power weight.

Optionally, the SCMA technology in the NOMA technology can be used on the RACH between the terminal and the second base station. Transmit M second preambles. Specifically, before the terminal sends the M second preambles to the second base station, the second base station needs to allocate a second sparse codebook based on the NOMA to the terminal, and send the second sparse codebook to the terminal, so that The terminal sends the M second preambles to the second base station by using the second sparse codebook. Correspondingly, the second base station receives the M second preambles according to the second sparse codebook.

Optionally, the M second preambles may also be transmitted between the terminal and the first base station by using a MIMO technology. That is, the terminal transmits M second preambles to the second base station on the PRACH through multiple transmit antennas, and the second base station also passes the M second preambles on the PRACH through multiple receive antennas.

S103. The first base station attempts to allocate first access information to the terminal according to the first preamble, where the first access information is used by the terminal to send uplink data to the first base station.

After the first base station receives the first preamble, the first base station may try to allocate the first access information to the terminal according to the first preamble, including attempting to allocate time-frequency resources for transmitting uplink data to the terminal. And allocating a first temporary C-RNTI, and calculating, according to the first preamble, a first transmission timing advance (TA) for transmitting uplink data by the terminal. In the embodiment of the present invention, if the first base station determines that there are sufficient resources to allocate the time-frequency resource to the terminal, the first base station may use the calculated first TA to indicate the first uplink of the time-frequency resource information. The information of the first temporary C-RNTI, the identifier of the first base station, and the like is used as the first access information, indicating that the first base station successfully allocates the first access information to the terminal, that is, the terminal successfully accesses the first base station. . If the first base station determines that the idle resource is insufficient to allocate the time-frequency resource to the terminal, the first base station determines that the first access information is failed to be allocated to the terminal, that is, the random access failed by the terminal to the first base station.

Optionally, if the terminal sends the N first preambles to the first base station, the first base station may try to allocate the first access information to the terminal according to the N first preambles, including the first preamble according to the N The code calculates a first TA in which the terminal transmits uplink data, attempts to allocate the time-frequency resource, allocates a first temporary C-RNTI, and the like.

S104. The second base station attempts to allocate second access information to the terminal according to the second preamble, where the second access information is used by the terminal to send uplink data to the second base station.

Similarly, after the second base station receives the second preamble, the second base station also attempts to allocate the second access information to the terminal according to the second preamble, including when the terminal attempts to allocate the uplink data for transmission. And a second temporary C-RNTI is allocated to the frequency resource, and the second TA and the like for transmitting the uplink data by the terminal are calculated according to the second preamble. In the embodiment of the present invention, if the second base station determines that there are sufficient resources to allocate time-frequency resources to the terminal, the second base station may use the calculated second TA to indicate the second uplink permission of the time-frequency resource information. The second temporary C-RNTI, the identifier of the second base station, and the like, as the second access information, indicates that the second base station successfully allocates the second access information to the terminal, that is, the terminal successfully accesses the second base station. If the second base station determines that the idle resource is insufficient to allocate the time-frequency resource to the terminal, that is, the second base station fails to allocate the second access information to the terminal, that is, the random access requested by the terminal to the second base station fails.

Optionally, if the terminal sends the M second preambles to the second base station, the second base station may try to allocate the second access information to the terminal according to the M second preambles, including the second preamble according to the N The code calculates a second TA in which the terminal transmits uplink data, attempts to allocate the time-frequency resource, allocates a second temporary C-RNTI, and the like.

S105. Interact access result information between the first base station and the second base station.

In an example, if the second base station successfully allocates the second access information to the terminal, the second base station sends the second access information to the first base station, so that the first base station connects the second access The information is carried in the success response message and sent to the terminal to notify the terminal to successfully access the second base station.

It can be understood that the first base station can determine, by using multiple manners, that the second access information sent by the second base station corresponds to the terminal, that is, the second base station allocates the second access information to the terminal. For example, when the second base station sends the second access information to the first base station, the second base station can simultaneously send the location information of the terminal, so that the first base station can determine the second access information as the first preamble according to the location information. Access information corresponding to the terminal. The first base station may also query, by the network management device, whether the second access information is access information and the like corresponding to the terminal.

If the second base station fails to allocate the second access information to the terminal, the second base station may send the failure notification information to the first base station, where the failure indication information may include the identifier of the terminal and the identifier of the second base station, and is used to notify The first base station, the terminal indicated by the identifier of the terminal fails to successfully access the second base station indicated by the identifier of the second base station.

Optionally, if the second base station fails to allocate the second access information to the terminal, the second base station may not send the failure notification message to the first base station, when the first base station does not receive the second time in the preset time period. When the second access information is sent by the base station, the first base station may determine that the terminal fails to successfully access the second base station.

S106. The first base station sends a success response message or a failure response message to the terminal.

In the embodiment of the present invention, if the terminal successfully accesses the first base station and/or the second base station, the first base station may send a success response message to the terminal.

The method includes: if the terminal successfully accesses the first base station and the second base station, the first base station carries the first access information and the second access information in the success response message, to notify the terminal to successfully connect And entering the first base station and the second base station, and enabling the terminal to send uplink data to the first base station according to the first access information, or send uplink data to the second base station according to the second access information.

It can be understood that, after the terminal successfully accesses the first base station and the second base station, when the terminal needs to transmit uplink data, the first base station and the second base station may be selected, and the channel quality between the terminal and the terminal is better. The base station performs uplink data transmission, thereby improving the transmission quality of the uplink data of the terminal.

If the terminal successfully accesses the first base station but fails to access the second base station, the success response information includes the first access information, where the success response message is used to indicate that the terminal successfully accesses the first base station, and When the terminal needs to transmit uplink data, the terminal may send uplink data to the first base station according to the first access information.

If the terminal successfully accesses the second base station but fails to access the first base station, the success response information includes the second access information, where the success response message is used to indicate that the terminal successfully accesses the second base station, and When the terminal needs to transmit uplink data, the terminal may send uplink data to the second base station according to the second access information.

If the terminal fails to access the first base station and the second base station, the first base station may send a failure response message to the terminal to indicate that the random access requested by the terminal to the first base station and the second base station fails, that is, The random access fails, so that the terminal can perform the random access procedure again until at least one of the first base station and the second base station is successfully accessed.

According to the random access method provided by the embodiment of the present invention, the terminal may request random access to the first base station and the second base station, and the terminal may complete the terminal as long as the terminal successfully accesses any one of the first base station and the second base station. The random access procedure performs the uplink data transmission. Compared with the manner in which the terminal requests the random access to the one base station in the traditional LTE system, the random access method provided by the embodiment of the present invention reduces the occurrence of the terminal in the random access process. The probability of collision collision improves the success rate of the terminal for random access, thereby reducing the delay of the terminal to perform the random access procedure.

In the random access procedure provided by the embodiment of the present invention, after the terminal sends the preamble to the first base station and the second base station to request random access, the terminal receives the success response message or the failure response message sent by the first base station, There is no other interaction process between the terminal and the first base station and the second base station, that is, the multiple handshake process does not need to go through the traditional random access procedure, thereby further reducing the delay of the random access process.

Optionally, the embodiment of the present invention further provides another random access method. As shown in FIG. 8, the method includes:

S201. The terminal sends at least two first preambles to the first base station, where the at least two first preambles are used by the terminal to request random access to the first base station.

In the embodiment of the present invention, the terminal may randomly select at least two from the first preamble set broadcasted by the first base station, and send the at least two first preambles to the first base station by using the PRACH to the first base station. Request random access.

Specifically, there may be multiple ways for the terminal to send at least two first preambles to the first base station. For example, refer to the multiple manners in which the terminal sends N first preambles to the first base station on the PRACH in S101 as shown in FIG. 4, and the terminal sends at least two first preambles on the PRACH to the first base station by using NOMA or MIMO technology. code.

Optionally, if the first base station has multiple control channels, the terminal may further send, by using one of the multiple control channels, the first preamble of the at least two first preambles to First base station. Compared with the traditional LTE system, the terminal sends a preamble requesting random access to the base station through a PRACH channel, and the terminal sends the first preamble to the first base station to request random access by using at least two control information, which can be reduced. The probability that multiple terminals transmit the same first preamble on the same time-frequency resource.

S202. The first base station attempts to allocate third access information to the terminal according to the at least two first preambles, where the third access information is used by the terminal to send uplink data to the first base station.

Referring to the related description in S103, as shown in FIG. 4, after the first base station receives the at least two first preambles, if the first base station determines that there are sufficient resources to allocate the time-frequency resource to the terminal, the first base station Calculating, according to the at least two first preambles, a third TA, a third uplink permission for indicating the time-frequency resource information, an allocated third temporary C-RNTI, an identifier of the first base station, and the like as the first The three access information indicates that the terminal successfully accesses the first base station. If the first base station determines that the idle resource is insufficient to allocate the time-frequency resource to the terminal, that is, the first base station fails to allocate the third access information to the terminal, it indicates that the terminal fails to successfully access the first base station.

S203. The first base station sends a success response message or a failure response message to the terminal.

When the first base station successfully allocates the third access information to the terminal, the first base station may send the third access information to the terminal in the success response message to notify the terminal to successfully access the first base station. When the uplink data needs to be sent, the uplink data is sent to the first base station according to the third access information; when the first base station fails to allocate the third access information to the terminal, the first base station may send a failure response to the terminal. Message.

The terminal may send at least two first preambles to the first base station to request random access to the first base station by using the random access method, and the terminal sends only one preamble request to the one base station in the conventional LTE system. In the mode of access, the terminal sends at least two first preambles to the base station to request random access, which can reduce the probability that multiple terminals send the same preamble on the same time-frequency resource, thereby reducing the probability that the terminal is random. The probability of collision collision during the access process, which reduces the delay caused by the terminal performing random access.

In the random access procedure provided by the embodiment of the present invention, after the terminal sends the preamble to the first base station to request random access, the terminal receives the success response message or the failure response message sent by the first base station, and the terminal and the first There is no other interaction process between the base stations, that is, multiple handshake processes that do not need to go through the traditional random access procedure. Thereby further reducing the delay of the random access process.

The solution provided by the embodiment of the present invention is mainly introduced from the perspective of interaction between the network elements. It can be understood that each network element, such as the terminal and the first base station, the second base station, etc., in order to implement the above functions, includes hardware structures and/or software modules corresponding to the respective functions. Those skilled in the art will readily appreciate that the present invention can be implemented in a combination of hardware or hardware and computer software in combination with the elements and algorithm steps of the various examples described in the embodiments disclosed herein. Whether a function is implemented in hardware or computer software to drive hardware depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

The embodiment of the present invention may perform the division of the function module on the terminal and the first base station according to the foregoing method. For example, each function module may be divided according to each function, or two or more functions may be integrated into one processing module. . The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of the module in the embodiment of the present invention is schematic, and is only a logical function division, and the actual implementation may have another division manner.

FIG. 9A is a schematic diagram showing a possible structure of a terminal involved in the foregoing embodiment, where the terminal includes: a sending unit and a receiving unit. The sending unit is configured to support the terminal to perform the processes S101 and S102 in FIG. 4 and the process S201 in FIG. 8; the receiving unit is configured to support the terminal to execute the process S106 in FIG. 4 and the process S203 in FIG. 8. All the related content of the steps involved in the foregoing method embodiments may be referred to the functional descriptions of the corresponding functional modules, and details are not described herein again.

In the case of employing an integrated unit, FIG. 9B shows a possible structural diagram of the terminal involved in the above embodiment. The terminal includes a processing module 900 and a communication module 901. The processing module 900 is configured to perform control management on the actions of the terminal. For example, the processing module 900 is configured to support the terminal to perform processes S101, S102, and S106 in FIG. 4, and S201 and S203 in FIG. 8, and/or in the text. Other processes of the described technology. The communication module 901 is configured to support communication between the terminal and other network entities, such as communication with the functional modules or network entities illustrated in FIG. The terminal may further include a storage module 902 for storing program codes and data of the terminal.

The processing module 900 can be a processor or a controller, for example, a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), and an application-specific integrated circuit (Application-Specific). Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA) or other programmable logic device, transistor logic device, hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like. The communication module 901 can be a transceiver, a transceiver circuit, a communication interface, or the like. The storage module 902 can be a memory.

When the processing module 900 is a processor, the communication module 901 is a transceiver, and the storage module 902 is a memory, the terminal involved in the embodiment of the present invention may be the terminal shown in FIG. 9C.

Referring to FIG. 9C, the terminal includes a processor 910, a transceiver 911, a memory 912, and a bus 913. The transceiver 911, the processor 910, and the memory 912 are connected to each other through a bus 913; the bus 913 can It is a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 9C, but it does not mean that there is only one bus or one type of bus.

FIG. 10A is a schematic diagram showing a possible structure of a first base station involved in the foregoing embodiment, where the first base station includes: a receiving unit, an allocating unit, and a sending unit, and Determine the unit. The receiving unit is configured to support the first base station to perform processes S102, S105 in FIG. 4, and S201 in FIG. 8; the sending unit is configured to support the first base station to perform process S106 in FIG. 4 and process S203 in FIG. 8; The allocating unit is configured to support the first base station to perform the process 103 in FIG. 4 and the process S202 in FIG. 8; the determining unit is configured to support the first base station to perform determining the first power weight. All the related content of the steps involved in the foregoing method embodiments may be referred to the functional descriptions of the corresponding functional modules, and details are not described herein again.

In the case of employing an integrated unit, FIG. 10B shows a possible structural diagram of the first base station involved in the above embodiment. The first base station includes: a processing module 1000 and a communication module 1001. The processing module 1000 is configured to perform control management on the action of the first base station. For example, the processing module 1000 is configured to support the first base station to perform processes S101, S103, S105, and S106 in FIG. 4, and S201, 202 in FIG. S203, and/or other processes for the techniques described herein. The communication module 1001 is configured to support communication between the first base station and other network entities, such as with the functional modules or network entities illustrated in FIG. The first base station may further include a storage module 1002 for storing program codes and data of the first base station.

The processing module 1000 can be a processor or a controller, such as a CPU, a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like. The communication module 1001 may be a communication interface, a transceiver circuit or a transceiver, or the like. The storage module 1002 can be a memory.

When the processing module 1000 is a processor, the communication module 1001 is a transceiver, and the storage module 1002 is a memory, the first base station involved in the embodiment of the present invention may be the first base station shown in FIG. 10C.

Referring to FIG. 10C, the first base station includes a processor 1010, a transceiver 1011, a memory 1012, and a bus 1013. The transceiver 1011, the processor 1010, and the memory 1012 are connected to each other through a bus 1010. The bus 1013 may be a PCI bus or an EISA bus. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 10C, but it does not mean that there is only one bus or one type of bus.

FIG. 11A is a schematic diagram showing a possible structure of a second base station involved in the foregoing embodiment, where the second base station includes: a receiving unit, an allocating unit, and a sending unit, and Determine the unit. The receiving unit is configured to support the second base station to perform the process S102 in FIG. 4; the sending unit is configured to support the second base station to perform the process S105 in FIG. 4; the allocating unit is configured to support the second base station to perform the process S104 in FIG. 4 The determining unit is configured to support the second base station to perform a process of allocating the second power weight. All the related content of the steps involved in the foregoing method embodiments may be referred to the functional descriptions of the corresponding functional modules, and details are not described herein again.

In the case of employing an integrated unit, FIG. 11B shows one of the second base stations involved in the above embodiment. A possible schematic diagram of the structure. The second base station includes a processing module 1100 and a communication module 1101. The processing module 1100 is configured to control and manage the actions of the second base station, for example, the processing module 1100 is configured to support the second base station to perform processes S102, 104, and 105 in FIG. 4, and/or for the techniques described herein. Other processes. The communication module 1101 is configured to support communication between the second base station and other network entities, such as with the functional modules or network entities illustrated in FIG. The second base station may further include a storage module 1102 for storing program codes and data of the second base station.

The processing module 1100 can be a processor or a controller, such as a CPU, a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like. The communication module 1101 may be a communication interface, a transceiver circuit or a transceiver, or the like. The storage module 1102 can be a memory.

When the processing module 1100 is a processor, the communication module 1101 is a transceiver, and the storage module 1102 is a memory, the second base station involved in the embodiment of the present invention may be the second base station shown in FIG. 11C.

Referring to FIG. 11C, the second base station includes a processor 1110, a transceiver 1111, a memory 1112, and a bus 1113. The transceiver 1111, the processor 1110, and the memory 1112 are connected to each other through a bus 1110. The bus 1113 may be a PCI bus or an EISA bus. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 11C, but it does not mean that there is only one bus or one type of bus.

The steps of a method or algorithm described in connection with the present disclosure may be implemented in a hardware, or may be implemented by a processor executing software instructions. The software instructions may be composed of corresponding software modules, which may be stored in a random access memory (RAM), a flash memory, a read only memory (ROM), an erasable programmable read only memory ( Erasable Programmable ROM (EPROM), electrically erasable programmable read only memory (EEPROM), registers, hard disk, removable hard disk, compact disk read only (CD-ROM) or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in a core network interface device. Of course, the processor and the storage medium may also exist as discrete components in the core network interface device.

Those skilled in the art will appreciate that in one or more examples described above, the functions described herein can be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored in a computer readable medium or transmitted as one or more instructions or code on a computer readable medium. Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A storage medium may be any available media that can be accessed by a general purpose or special purpose computer.

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims (39)

A random access method, the method comprising: Transmitting, by the terminal, a first preamble to the first base station, where the first preamble is used by the terminal to request random access to the first base station; Transmitting, by the terminal, a second preamble to the second base station, where the second preamble is used by the terminal to request random access to the second base station; Receiving, by the terminal, the success response information sent by the first base station, where the success response message is used to indicate that the terminal successfully accesses at least one of the first base station and the second base station, the success response information The base station that is successfully accessed by the terminal is the access information allocated by the terminal, and the access information is used by the terminal to send uplink data to the base station that the terminal successfully accesses. The method of claim 1 wherein The number of the first preambles is N, and/or the number of the second preambles is M, where N>1, N is an integer, M>1, and M is an integer. The method according to claim 2, wherein the number of the first preambles is N, and before the terminal sends the first preamble to the first base station, the method further includes: Receiving, by the first base station, a first sparse codebook based on non-orthogonal multiple access, where the first sparse codebook is used by the terminal to send N first preambles to the first base station; Sending, by the terminal, the first preamble to the first base station, including: The terminal sends the N first preambles to the first base station by using the first sparse codebook. The method according to claim 1, wherein the number of the first preambles is N, and before the terminal sends the first preamble to the first base station, the method further includes: The terminal acquires a first power weight based on non-orthogonal multiple access, where the first power weight is used by the terminal to send N first preambles to the first base station; Sending, by the terminal, the first preamble to the first base station, including: The terminal sends the N first preambles to the first base station by using the first power weight. The method according to any one of claims 2-4, wherein the number of the first preambles is N, and the terminal sends the first preamble to the first base station, including: The terminal sends N first preambles to the first base station by using multiple transmit antennas. The method according to any one of claims 2 to 5, wherein the number of the second preambles is M, and before the terminal sends the second preamble to the second base station, the method further includes : Receiving, by the second base station, a second sparse codebook based on non-orthogonal multiple access, where the second sparse codebook is used by the terminal to send M second preambles to the second base station; Sending, by the terminal, the second preamble to the second base station, including: The terminal sends the M second preambles to the second base station by using the second sparse codebook. The method according to any one of claims 2 to 5, wherein the number of the second preambles is M, and before the terminal sends the second preamble to the second base station, the method further includes : The terminal acquires a second power weight based on non-orthogonal multiple access, where the second power weight is used by the terminal to send M second preambles to the second base station; Sending, by the terminal, the second preamble to the second base station, including: The terminal sends the M second preambles to the second base station by using the second power weight. The method according to any one of claims 2-7, wherein the number of the second preambles is M, and the terminal sends the second preamble to the second base station, including: The terminal sends M second preambles to the second base station by using multiple transmit antennas. A random access method, the method comprising: Receiving, by the first base station, a first preamble sent by the terminal, where the first preamble is used by the terminal to request random access to the first base station; The first base station attempts to allocate the first access information to the terminal according to the first preamble, and the first access information is used by the terminal to send uplink data to the first base station; The first base station sends the success response information to the terminal, where the success response information includes at least one of the first access information and the second access information, and the second access information is the second base station. Sending access information corresponding to the terminal, where the second access information is used by the terminal to send uplink data to the second base station. The method according to claim 9, wherein the number of the first preambles is N, N>1, and N is an integer. The first base station attempts to allocate the first access information to the terminal according to the first preamble, including: The first base station attempts to allocate the first access information to the terminal according to the N first preambles. The method according to claim 10, wherein before the first base station receives the first preamble sent by the terminal, the method further includes: The first base station allocates a first sparse codebook based on non-orthogonal multiple access to the terminal; Sending, by the first base station, the first sparse codebook to the terminal, so that the terminal sends the N first preambles to the first base station by using the first sparse code; The first base station receives the first preamble sent by the terminal, and includes: Receiving, by the first base station, the N first preambles sent by the terminal according to the first sparse codebook. The method according to claim 10, wherein before the first base station receives the first preamble sent by the terminal, the method further includes: Determining, by the first base station, a first power weight based on non-orthogonal multiple access, where the first power weight is used by the first base station to receive N first preambles sent by the terminal; The first base station receives the first preamble sent by the terminal, and includes: The first base station receives the N first preambles sent by the terminal according to the first power weight. The method according to any one of claims 10 to 12, wherein the receiving, by the first base station, the first preamble sent by the terminal comprises: The first base station receives N first preambles sent by the terminal by using multiple receiving antennas. The method according to any one of claims 9 to 13, wherein if the first base station fails to allocate the first access information to the terminal, and the first base station does not receive the first The second access information sent by the second base station, the method further includes: The first base station sends a failure response message to the terminal, where the failure response message is used to indicate that the random access requested by the terminal to the first base station and the second base station fails. A random access method, the method comprising: Receiving, by the second base station, a second preamble sent by the terminal, where the second preamble is used by the terminal to the second The base station requests random access; The second base station allocates second access information to the terminal according to the second preamble, and the second access information is used by the terminal to send uplink data to the second base station; The second base station sends the second access information to the first base station, so that the first base station sends the second access information to the terminal. The method according to claim 15, wherein the number of the second preambles is M, M>1, and M is an integer. The second base station allocates second access information to the terminal according to the second preamble, including: The second base station allocates the second access information to the terminal according to the M second preambles. The method according to claim 16, wherein before the second base station receives the second preamble sent by the terminal, the method further includes: Determining, by the second base station, a second power weight based on non-orthogonal multiple access, where the second power weight is used by the first base station to receive M second preambles sent by the terminal; The second base station receives the second preamble sent by the terminal, and includes: The second base station receives the M second preambles sent by the terminal according to the second power weight. The method according to claim 16, wherein before the second base station receives the second preamble sent by the terminal, the method further includes: The second base station allocates a second sparse codebook based on non-orthogonal multiple access to the terminal; Sending, by the second base station, the second sparse codebook to the terminal, so that the terminal sends the M second preambles to the second base station by using the second sparse code; The second base station receives the second preamble sent by the terminal, and includes: The second base station receives the M second preambles sent by the terminal according to the second sparse codebook. The method according to any one of claims 16 to 18, wherein the second base station receives the second preamble sent by the terminal, including: The second base station receives M second preambles sent by the terminal by using multiple receiving antennas. A terminal, comprising: a sending unit, configured to send a first preamble to the first base station, where the first preamble is used by the terminal to request random access to the first base station; The sending unit is further configured to send a second preamble to the second base station, where the second preamble is used by the terminal to request random access to the second base station; a receiving unit, configured to receive the success response information sent by the first base station, where the success response message is used to indicate that the terminal successfully accesses at least one of the first base station or the second base station, the success The response information includes the access information allocated by the base station that the terminal successfully accesses to the terminal, and the access information is used by the terminal to send uplink data to the base station that the terminal successfully accesses. The terminal according to claim 20, characterized in that The number of the first preambles is N, and/or the number of the second preambles is M, N>1, N is an integer, M>1, and M is an integer. The terminal according to claim 21, wherein the number of the first preambles is N. The receiving unit is further configured to receive the first base station before sending the first preamble to the first base station Sending a first sparse codebook based on non-orthogonal multiple access, where the first sparse codebook is used by the sending unit to send N first preambles; The sending, by the sending unit, the first preamble to the first base station, specifically: sending, by using the first sparse codebook, the N first preambles to the first base station. The terminal according to claim 21, wherein the number of the first preambles is N. The sending unit is further configured to: before transmitting the first preamble to the first base station, acquire a first power weight based on non-orthogonal multiple access, where the first power weight is used by the sending unit to the first The base station sends N first preambles; The sending, by the sending unit, the first preamble to the first base station, specifically: sending, by using the first power weight, the N first preambles to the first base station. The terminal according to any one of claims 21 to 23, wherein the number of the first preambles is N. The sending, by the sending unit, the first preamble to the first base station, specifically: sending, by using multiple transmit antennas, N first preambles to the first base station. The terminal according to any one of claims 21 to 24, wherein the number of the second preambles is M. The receiving unit is further configured to: before the transmitting unit sends the second preamble to the second base station, receive a second sparse codebook based on the non-orthogonal multiple address sent by the second base station, where the second sparse codebook The codebook is used by the sending unit to send M second preambles to the second base station; The sending, by the sending unit, the second preamble to the second base station, specifically: sending, by using the second sparse codebook, the M second preambles to the second base station. The terminal according to any one of claims 21 to 24, wherein the number of the second preambles is M. The sending unit is further configured to: before sending the second preamble to the second base station, acquire a second power weight based on non-orthogonal multiple access, where the second power weight is used by the sending unit to send by the second base station M second preambles; The sending, by the sending unit, the second preamble to the second base station, specifically: sending, by using the second power weight, the M second preambles to the second base station. The terminal according to any one of claims 21 to 26, wherein the number of the second preambles is M. The sending, by the sending unit, the second preamble to the second base station, specifically: sending, by using multiple transmit antennas, M second preambles to the second base station. A base station, comprising: a receiving unit, configured to receive a first preamble sent by the terminal, where the first preamble is used by the terminal to request random access to the base station; An allocating unit, configured to allocate first access information to the terminal according to the first preamble received by the receiving unit, where the first access information is used by the terminal to send uplink data to the base station; a sending unit, configured to send, to the terminal, success response information, where the success response information includes at least one of first access information allocated by the allocating unit and second access information received by the receiving unit, where Narrative The second access information is the access information corresponding to the terminal that is sent by the second base station, and the second access information is used by the terminal to send uplink data to the second base station. The base station according to claim 28, wherein the number of the first preambles is N, N>1, and N is an integer. And the allocating unit, according to the first preamble, attempting to allocate the first access information to the terminal, specifically, including: attempting to allocate the first access information to the terminal according to the N first preambles. The base station according to claim 29, characterized in that The allocating unit is further configured to allocate a first sparse codebook based on non-orthogonal multiple access to the terminal before the receiving unit receives the first preamble sent by the terminal; The sending unit is further configured to send the first sparse codebook to the terminal, so that the terminal sends the N first preambles to the base station by using the first sparse code; The receiving, by the receiving unit, the first preamble sent by the terminal, specifically, receiving the N first preambles sent by the terminal according to the first sparse codebook. The base station according to claim 29, wherein the base station further comprises a determining unit: The determining unit is configured to determine a first power weight based on non-orthogonal multiple access before the receiving unit receives the first preamble sent by the terminal, where the first power weight is used by the receiving unit to receive the N first preambles sent by the terminal; And receiving, by the receiving unit, the first preamble sent by the terminal, where the method includes: receiving, according to the first power weight determined by the determining unit, the N first preambles sent by the terminal. A base station according to any of claims 29-31, characterized in that The receiving unit receives the first preamble sent by the terminal, and specifically includes: receiving, by using the plurality of receiving antennas, the N first preambles sent by the terminal. The base station according to any one of claims 28 to 32, wherein if the allocating unit fails to allocate the first access information to the terminal, and the receiving unit does not receive the second base station, The second access information sent, The sending unit is further configured to send a failure response message to the terminal, where the failure response message is used to indicate that the random access requested by the terminal to the base station and the second base station fails. A base station, comprising: a receiving unit, configured to receive a second preamble sent by the terminal, where the second preamble is used by the terminal to request random access to the base station; An allocating unit, configured to allocate second access information to the terminal according to the second preamble received by the receiving unit, where the second access information is used by the terminal to send uplink data to the base station; And a sending unit, configured to send, by the first base station, the second access information that is allocated by the allocating unit, so that the first base station sends the second access information to the terminal. The base station according to claim 34, wherein the number of the second preambles is M, M>1, and M is an integer. And the assigning unit allocates the second access information to the terminal according to the second preamble, and specifically includes: allocating the second access information to the terminal according to the M second preambles. The base station according to claim 35, wherein the base station further comprises a determining unit: The determining unit is configured to determine a second power weight based on non-orthogonal multiple access before the receiving unit receives the second preamble sent by the terminal, where the second power weight is used by the receiving unit to receive the M second preambles sent by the terminal; Receiving, by the receiving unit, the second preamble sent by the terminal, specifically: receiving, according to the second power weight, the M second preambles sent by the terminal. The base station according to claim 35, characterized in that The allocating unit is further configured to allocate a second sparse codebook based on non-orthogonal multiple access to the terminal before the receiving unit receives the second preamble sent by the terminal; The sending unit is further configured to send the second sparse codebook to the terminal, so that the terminal sends the M second preambles to the base station by using the second sparse code; The receiving, by the receiving unit, the second preamble sent by the terminal, specifically: receiving, according to the second sparse codebook, the M second preambles sent by the terminal. A base station according to any of claims 35-37, characterized in that The receiving unit receives the second preamble sent by the terminal, and specifically includes: receiving, by using the multiple receiving antennas, the M second preambles sent by the terminal. A communication system, comprising: A terminal according to any of claims 20-27, a base station according to any of claims 28-33, and a base station according to any of claims 34-38.

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