WO2016019511A1 - Method and device for eliminating interference in wireless communication system - Google Patents

Abstract

Provided are a method and device for eliminating interference in a wireless communication system, the method comprising: a base station conducts self-interference channel estimation on a half-duplex downlink time-frequency resource to acquire a self-interference channel parameter; the base station receives a received signal intensity of a first uplink reference signal reported by at least one second terminal via a second half-duplex uplink time-frequency resource; the base station determines a first terminal pair according to the received signal intensity of the first uplink reference signal; the base station respectively allocates a full-duplex time-frequency resource to a first terminal and a second terminal in the first terminal pair according to the received signal intensity of the first uplink reference signal, such that the base station receives a first signal transmitted by the first terminal in the first terminal pair by utilizing the full-duplex time-frequency resource, transmits a second signal to the second terminal in the first terminal pair, and acquires a self-interference eliminating signal on the full-duplex time-frequency resource according to the self-interference channel parameter and the second signal so as to conduct self-interference elimination, thus improving the capacity of the wireless communication system.

Description

 Interference cancellation method and device for wireless communication system

Technical field

 The present invention relates to communication technologies, and in particular, to an interference cancellation method and apparatus for a wireless communication system. Background technique

 In recent years, due to the scarcity of wireless spectrum resources, academics and industry are looking for ways to improve the efficiency of wireless spectrum utilization. In the topology of point-to-point communication, the wireless transceiver 1 transmits a signal to the wireless transceiver 2 while receiving the signal transmitted by the wireless transceiver 2 at the same frequency, theoretically than the half-duplex mode (such as time division duplex mode, frequency division) Duplex mode) Doubles the channel capacity.

 In order to achieve simultaneous co-frequency transmission and reception (which can also be full-duplex), the transceiver needs to introduce a self-interference cancellation link. Therefore, full-duplex transceivers are more complex, costly, and bulkier than half-duplex transceivers. Considering the cost and size limitations of the terminal equipment, the base station has a full-duplex transceiver, and the terminal has only a half-duplex transceiver, which is a more economical full-duplex implementation. In order to enable the wireless communication system formed by the base station and the terminal to operate in a full-duplex state (on the same time-frequency resource and simultaneously transmit uplink and downlink signals), the base station simultaneously schedules at least two terminals in the same frequency, and one terminal is in a transmitting state. (Uplink signal transmission), a terminal is in a receiving state (reception of a downlink signal), and the channel capacity is increased by using the full-duplex transceiver capability of the base station.

 However, in this network topology, there are at least two types of interference, one is the self-interference of the transmitted signal of the full-duplex transceiver inside the base station (that is, the transmitted signal transmitted to the terminal 1) to the received signal of the base station itself, and the other is It is the inter-terminal device interference of the uplink reception of the terminal 2 to the downlink reception of the terminal 1. Both of the above interferences cause loss of channel capacity of the wireless communication system. For the two types of interference in the topology of the wireless communication system shown in Fig. 1, there is currently no complete solution for reducing or eliminating both types of interference. Summary of the invention

The present invention provides an interference cancellation method and apparatus for a wireless communication system, which is used to solve the technical problem of loss of channel capacity of a wireless communication system caused by self-interference and inter-terminal interference in the prior art. In a first aspect, the present invention provides an interference cancellation method for a wireless communication system, including: performing, by a base station, self-interference channel estimation on a half-duplex downlink time-frequency resource, and acquiring a self-interference channel parameter;

 Receiving, by the base station, a received signal strength of the first uplink reference signal that is reported by the second terminal by the second half-duplex uplink time-frequency resource; the received signal strength of the first uplink reference signal is the at least one second terminal Obtaining, by measuring, by the first uplink reference signal that is sent by the at least one first terminal on the first half-duplex uplink time-frequency resource;

 Determining, by the base station, the first terminal pair from the at least the first terminal and the at least one second terminal according to the received signal strength of the first uplink reference signal; wherein the first terminal pair includes the first terminal and The second terminal, the interference between the first terminal and the second terminal in the first terminal pair is less than a preset threshold;

 The base station configures the full-duplex time-frequency resources to the first terminal and the second terminal in the first terminal pair according to the received signal strength of the first uplink reference signal;

 Receiving, by the base station, the first signal sent by the first terminal in the first terminal pair by using the full-duplex time-frequency resource, and using the full-duplex time-frequency resource to the first terminal The second terminal sends the second signal;

 And the base station acquires a self-interference cancellation signal according to the self-interference channel parameter and the second signal on the full-duplex time-frequency resource to perform self-interference cancellation.

 With reference to the first aspect, in a first possible implementation manner of the first aspect, the base station is configured to notify the at least one second terminal to measure a time-frequency resource, where the measured time-frequency resource includes the first half-double Uplink time-frequency resources;

 The base station sends the signal parameter of the first uplink reference signal to the at least one second terminal; the received signal strength of the first uplink reference signal is that the at least one second terminal is on the measured time-frequency resource Obtaining according to the signal parameter measurement of the first uplink reference signal.

 With reference to the first aspect, or the first possible implementation manner of the first aspect, in the second possible implementation manner of the first aspect, the half duplex downlink time-frequency resource includes a half-duplex downlink subframe, and a S-sub At least one of a downlink pilot time slot of the frame, a half-duplex downlink frequency band, and a prefix time of the OFDM symbol in the fourth type of subframe.

In conjunction with the second possible implementation of the first aspect, the third possible implementation in the first aspect In the embodiment, the half-duplex downlink subframe includes a fixed downlink subframe, and the fixed downlink subframe includes a subframe 0 and/or a subframe 5.

 With reference to the second possible implementation manner of the first aspect or the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, if the half duplex downlink time-frequency resource is At least one of a half-duplex downlink subframe, a half-duplex downlink frequency band, and a downlink pilot time slot of the S-subframe, the base station performs self-interference channel estimation on the half-duplex downlink time-frequency resource, Obtain self-interference channel parameters, including:

 And performing, by the base station, at least one of the half-duplex downlink subframe, the half-duplex downlink frequency band, and the downlink pilot time slot of the S subframe to the wireless communication system a terminal sends a third signal;

 The base station receives the first received signal on the at least one resource in the half-duplex downlink subframe, the half-duplex downlink frequency band, and the downlink pilot time slot of the S subframe;

 The base station acquires a self-interference channel parameter according to the y^ /^ A + , where the ^ is the first received signal; the noise is when the base station performs self-interference channel estimation; ^ is the self-interference channel parameter; the is the third signal.

 In conjunction with the fourth possible implementation of the first aspect, in a fifth possible implementation of the first aspect, the first received signal and the third signal are oversampled signals.

 With reference to the second possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, if the half duplex downlink time-frequency resource is a prefix of an OFDM symbol in the fourth type of subframe The time base, the base station performs self-interference channel estimation on the half-duplex downlink time-frequency resource, and obtains self-interference channel parameters, including:

 Transmitting, by the base station, a prefix of a cyclic prefix orthogonal frequency division multiplexing CP-OFDM signal to the at least one second terminal within a prefix time of the OFDM symbol in the fourth type of subframe;

 And the base station schedules, by the at least one first terminal, a prefix of a zero-prefix Orthogonal Frequency Division Multiplexing ZP-OFDM signal to be sent to the base station within a prefix time of the OFDM symbol in the fourth type of subframe;

 The base station receives the second received signal within a prefix time of an OFDM symbol in the fourth type of subframe;

The base station obtains a self-interference channel parameter according to 33⁄4 = ^ * ^ _{1 +} ^; wherein, the ^ is the second received signal; the noise when the base station performs self-interference channel estimation; ^为 The self-interference channel parameter; the prefix of the CP-OFDM signal.

 In conjunction with the sixth possible implementation of the first aspect, in a seventh possible implementation of the first aspect, the second received signal and the CP-OFDM signal are oversampled signals.

 In combination with the first aspect to any one of the seventh possible implementation manners of the first aspect, in the eighth possible implementation manner of the first aspect, the method further includes:

 The base station transmits the first pilot signal to the at least one second terminal by using the first full-duplex time-frequency resource, and receives the second pilot sent by the at least one first terminal by using the second full-duplex time-frequency resource The first full duplex time-frequency resource and the second full-duplex time-frequency resource are orthogonal time-frequency resources.

 In combination with the first aspect to any one of the seventh possible implementation manners of the first aspect, in a ninth possible implementation manner of the first aspect, the method further includes:

 The base station receives the third pilot signal sent by the at least one first terminal by using the third full-duplex time-frequency resource; wherein the base station remains silent on the third full-duplex time-frequency resource.

 With reference to the ninth possible implementation of the first aspect, in a tenth possible implementation manner of the first aspect, the method further includes:

 The base station transmits a fourth pilot signal to the at least one second terminal by using a fourth full-duplex time-frequency resource, where the base station controls the at least one first terminal in the fourth full-duplex time-frequency Keep quiet on resources.

 In a second aspect, the present invention provides a method for canceling interference in a wireless communication system, including: transmitting, by a first terminal, a first uplink reference signal on a first half-duplex uplink time-frequency resource, so that at least one second terminal measures the a received signal strength of the first uplink reference signal, and the received signal strength of the first uplink reference signal is reported to the base station by using the second half-duplex uplink time-frequency resource; the first terminal uses the full-duplex time-frequency resource to The base station sends the first signal; the full-duplex time-frequency resource is configured by the base station according to the received signal strength of the first uplink reference signal to the first terminal and the second terminal in the first terminal pair, where The first terminal pair includes the first terminal and the second terminal, and the interference between the first terminal and the second terminal in the first terminal pair is less than a preset threshold.

 In conjunction with the second aspect, in a first possible implementation of the second aspect, the method further includes:

The first terminal receives a third signal sent by the base station on at least one of a half-duplex downlink subframe, a half-duplex downlink frequency band, and a downlink pilot time slot of the S subframe. With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the half duplex downlink subframe includes a fixed downlink subframe, where the fixed downlink subframe includes Subframe 0 and/or subframe 5.

 In conjunction with the first possible implementation of the second aspect, in a third possible implementation of the second aspect, the third signal is an oversampled signal.

 With reference to the second aspect, in a fourth possible implementation manner of the second aspect, the method further includes:

 The first terminal transmits a prefix of a zero-prefix orthogonal frequency division multiplexing ZP-OFDM signal to the base station within a prefix time of the OFDM symbol in the fourth type of subframe.

 With reference to any one of the second aspect to the fourth possible implementation of the second aspect, in a fifth possible implementation manner of the second aspect, the method further includes:

 Transmitting, by the first terminal, a second pilot signal to the base station by using a second full-duplex time-frequency resource, where the second full-duplex time-frequency resource and the base station send the second pilot to the at least one second terminal The first full-duplex time-frequency resource used by the first pilot signal is an orthogonal time-frequency resource.

 With reference to any one of the second aspect to the fourth possible implementation of the second aspect, in a sixth possible implementation manner of the second aspect, the method further includes:

 The first terminal receives a third pilot signal that is sent by the base station by using a third full-duplex time-frequency resource; wherein, on the third full-duplex time-frequency resource, the base station remains silent.

 In a third aspect, the present invention provides an interference cancellation method for a wireless communication system, including: transmitting, by a second terminal, a received signal strength of a first uplink reference signal to a base station by using a second half-duplex uplink time-frequency resource, so that the base station And configuring, according to the received signal strength of the first uplink reference signal, the full-duplex time-frequency resource to the first terminal and the second terminal in the first terminal pair; the received signal strength of the first uplink reference signal is The second terminal is obtained by measuring the first uplink reference signal sent by the at least one first terminal on the first half-duplex uplink time-frequency resource; the first terminal pair is the first uplink according to the first terminal The received signal strength of the reference signal is determined from the at least the first terminal and the at least one second terminal; wherein the first terminal pair includes the first terminal and the second terminal, and the first of the first terminal pairs The interference between the terminal and the second terminal is less than a preset threshold;

The second terminal in the first terminal pair receives the second signal sent by the base station by using the full-duplex time-frequency resource. In conjunction with the third aspect, in a first possible implementation manner of the third aspect, the method further includes:

 The second terminal receives a third signal sent by the base station on at least one resource in a half-duplex downlink subframe, a half-duplex downlink frequency band, and a downlink pilot time slot of the s-subframe.

 With reference to the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the half duplex downlink subframe includes a fixed downlink subframe, where the fixed downlink subframe includes Subframe 0 and/or subframe 5.

 In conjunction with the first possible implementation of the third aspect, in a third possible implementation of the third aspect, the third signal is an oversampled signal.

 In conjunction with the third aspect, in a fourth possible implementation manner of the third aspect, the method further includes:

 And the second terminal receives a prefix of a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) signal that is sent by the base station in a prefix time of an OFDM symbol in the fourth type of subframe.

 In conjunction with the fourth possible implementation of the third aspect, in a fifth possible implementation of the third aspect, the CP-OFDM signal is an oversampled signal.

 With reference to any one of the third aspect to the fifth possible implementation manner of the third aspect, in a sixth possible implementation manner of the third aspect, the method further includes:

 The second terminal receives the first pilot signal that is sent by the base station on the first full-duplex time-frequency resource, where the first full-duplex time-frequency resource and the at least one first terminal The second full-duplex time-frequency resource used by the base station to transmit the second pilot signal is an orthogonal time-frequency resource.

 With reference to any one of the third aspect to the fifth possible implementation manner of the third aspect, in a seventh possible implementation manner of the third aspect, the method further includes:

 The second terminal receives the fourth pilot signal that is sent by the base station on the fourth full-duplex time-frequency resource, where the base station controls the at least one on the fourth full-duplex time-frequency resource The first terminal remains silent.

 In a fourth aspect, the present invention provides a base station, including:

a receiving module, configured to receive, by the at least one second terminal, a received signal strength of the first uplink reference signal that is reported by the second half-duplex uplink time-frequency resource; the received signal strength of the first uplink reference signal is the at least one Obtaining, by the second terminal, the first uplink reference signal sent by the at least one first terminal on the first half-duplex uplink time-frequency resource; The first terminal in the first terminal pair, the first signal sent by using the configured full-duplex time-frequency resource; the processing module, configured to perform self-interference channel estimation on the half-duplex downlink time-frequency resource, obtained from Intersecting the channel parameter; and determining, according to the received signal strength of the first uplink reference signal, the first terminal pair from the at least the first terminal and the at least one second terminal; wherein the first terminal pair includes The first terminal and the second terminal, the interference between the first terminal and the second terminal in the first terminal pair is less than a preset threshold; and is used to perform full duplex according to the received signal strength of the first uplink reference signal. The time-frequency resource is respectively configured to the first terminal and the second terminal in the first terminal pair, and the sending module is configured to use the full-duplex time-frequency resource configured by the processing module to be in the first terminal pair The second terminal sends the second signal;

 The processing module is further configured to obtain a self-interference cancellation signal according to the self-interference channel parameter and the second signal on the full-duplex time-frequency resource to perform self-interference cancellation.

 With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the sending module is further configured to notify the at least one second terminal to measure a time-frequency resource, where the measuring time-frequency resource includes a first half-duplex uplink time-frequency resource; and configured to send a signal parameter of the first uplink reference signal to the at least one second terminal; the received signal strength of the first uplink reference signal is the at least one The two terminals are obtained according to the signal parameters of the first uplink reference signal on the measured time-frequency resource.

 With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, in the second possible implementation manner of the fourth aspect, the half duplex downlink time-frequency resource includes a half-duplex downlink subframe, and a S sub- At least one of a downlink pilot time slot of the frame, a half-duplex downlink frequency band, and a prefix time of the OFDM symbol in the fourth type of subframe.

 With reference to the second possible implementation manner of the fourth aspect, in a third possible implementation manner of the fourth aspect, the half duplex downlink subframe includes a fixed downlink subframe, where the fixed downlink subframe includes Subframe 0 and/or subframe 5.

With reference to the second possible implementation manner of the fourth aspect or the third possible implementation manner of the fourth aspect, in the fourth possible implementation manner of the fourth aspect, if the half duplex downlink time-frequency resource is The at least one of the half-duplex downlink subframe, the half-duplex downlink frequency band, and the downlink pilot time slot of the S-subframe, where the sending module is further used in the half-duplex downlink subframe, And transmitting, by the at least one resource of the half-duplex downlink frequency band and the downlink pilot time slot of the S subframe, a third signal to any terminal in the wireless communication system; In the half duplex Receiving, by the downlink subframe, the half-duplex downlink frequency band, and at least one of the downlink pilot time slots of the s subframe, the first received signal;

 The processing module is specifically configured to acquire a self-interference channel parameter according to the method, where the first received signal is used; and the noise is used when the base station performs self-interference channel estimation; The self-interference channel parameter; the third signal.

 In conjunction with the fourth possible implementation of the fourth aspect, in a fifth possible implementation of the fourth aspect, the first received signal and the third signal are oversampled signals.

 With reference to the second possible implementation manner of the fourth aspect, in a sixth possible implementation manner of the fourth aspect, if the half duplex downlink time-frequency resource is a prefix of an OFDM symbol in the fourth type of subframe The sending module is further configured to send a prefix of a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) signal to the at least one second terminal within a prefix time of the OFDM symbol in the fourth type of subframe; The processing module is further configured to: schedule, by the at least one first terminal, a prefix of a ZP-OFDM signal to be sent to the base station in a prefix time of the OFDM symbol in the fourth type of subframe; Receiving, by the prefix time of the OFDM symbol in the fourth type of subframe, the second received signal;

 The processing module is specifically configured to obtain a self-interference channel parameter according to the +1; wherein, the second received signal is; the noise when the base station performs self-interference channel estimation; Self-interference channel parameter; the prefix of the CP-OFDM signal.

 In conjunction with the sixth possible implementation of the fourth aspect, in a seventh possible implementation of the fourth aspect, the second received signal and the CP-OFDM signal are oversampled signals.

 With reference to any one of the fourth aspect to the seventh possible implementation manner of the fourth aspect, in the eighth possible implementation manner of the fourth aspect, the sending module is further configured to adopt the first full duplex Transmitting, by the time-frequency resource, the first pilot signal to the at least one second terminal;

 The receiving module is further configured to receive, by using the second full-duplex time-frequency resource, the second pilot signal that is sent by the at least one first terminal, where the first full-duplex time-frequency resource and the second The full-duplex time-frequency resource is an orthogonal time-frequency resource.

With reference to any one of the fourth aspect to the seventh possible implementation manner of the fourth aspect, in the ninth possible implementation manner of the fourth aspect, the receiving module is further configured to adopt a third full duplex Receiving, by the time-frequency resource, a third pilot signal sent by the at least one first terminal; where The block remains silent on the third full duplex time-frequency resource.

 With reference to the ninth possible implementation manner of the fourth aspect, in a tenth possible implementation manner of the fourth aspect, the sending module is further configured to use the fourth full duplex time-frequency resource to the at least one The second terminal transmits a fourth pilot signal, where the processing module controls the at least one first terminal to remain silent on the fourth full-duplex time-frequency resource.

 In a fifth aspect, the present invention provides a first terminal, including:

 a sending module, configured to send a first uplink reference signal on the first half-duplex uplink time-frequency resource, so that the at least one second terminal measures the received signal strength of the first uplink reference signal, and the first uplink is The received signal strength of the reference signal is reported to the base station by using the second half-duplex uplink time-frequency resource; and is further configured to send the first signal to the base station by using the full-duplex time-frequency resource; the full-duplex time-frequency resource is the base station according to the base station The received signal strength of the first uplink reference signal is configured to the first terminal and the second terminal in the first terminal pair, where the first terminal pair includes the first terminal and the second terminal, and the first terminal The interference between the first terminal and the second terminal in the pair is less than a preset threshold.

 With reference to the fifth aspect, in a first possible implementation manner of the fifth aspect, the first terminal further includes: a receiving module, configured to receive a base station in a half duplex downlink subframe, a half duplex downlink frequency band, and a S sub A third signal transmitted on at least one of the downlink pilot time slots of the frame.

 With reference to the first possible implementation manner of the fifth aspect, in a second possible implementation manner of the fifth aspect, the half duplex downlink subframe includes a fixed downlink subframe, where the fixed downlink subframe includes Subframe 0 and/or subframe 5.

 In conjunction with the first possible implementation of the fifth aspect, in a third possible implementation of the fifth aspect, the third signal is an oversampled signal.

 With reference to the fifth aspect, in a fourth possible implementation manner of the fifth aspect, the sending module is further configured to send a zero prefix orthogonal to the base station in a prefix time of the OFDM symbol in the fourth type of subframe The prefix of the frequency division multiplexed ZP-OFDM signal.

 With reference to any one of the fifth aspect to the fourth possible implementation manner of the fifth aspect, in a fifth possible implementation manner of the fifth aspect, the sending module is further configured to adopt a second full duplex Transmitting, by the time-frequency resource, the second pilot signal to the base station, where the second full-duplex time-frequency resource and the first full-length used by the base station to send the first pilot signal to the at least one second terminal The duplex time-frequency resource is an orthogonal time-frequency resource.

In combination with any of the fifth aspect to the fourth possible implementation of the fifth aspect, at the fifth In a sixth possible implementation manner, the receiving module is further configured to receive a third pilot signal that is sent by the base station by using a third full-duplex time-frequency resource, where the third full-duplex On the time-frequency resource, the base station remains silent.

 In a sixth aspect, the present invention provides a second terminal, including:

 a sending module, configured to send, by using a second half-duplex uplink time-frequency resource, a received signal strength of the first uplink reference signal to the base station, so that the base station performs full-duplex according to the received signal strength of the first uplink reference signal The time-frequency resources are respectively configured to the first terminal and the second terminal in the first terminal pair; the received signal strength of the first uplink reference signal is that the second terminal is in the first half duplex by measuring at least one first terminal Acquiring the first uplink reference signal sent on the uplink time-frequency resource; the first terminal pair is the received signal strength of the base station according to the first uplink reference signal from the at least first terminal and at least one And determining, by the first terminal, the first terminal and the second terminal, where interference between the first terminal and the second terminal in the first terminal pair is less than a preset threshold;

 The receiving module is configured to receive a second signal that is sent by the base station by using the full-duplex time-frequency resource. With reference to the sixth aspect, in a first possible implementation manner of the sixth aspect, the receiving module is further configured to receive the downlink of the base station in a half-duplex downlink subframe, a half-duplex downlink frequency band, and an S subframe A third signal transmitted on at least one of the link pilot time slots.

 With reference to the first possible implementation manner of the sixth aspect, in a second possible implementation manner of the sixth aspect, the half duplex downlink subframe includes a fixed downlink subframe, where the fixed downlink subframe includes Subframe 0 and/or subframe 5.

 In conjunction with the first possible implementation of the sixth aspect, in a third possible implementation of the sixth aspect, the third signal is an oversampled signal.

 With reference to the sixth aspect, in a fourth possible implementation manner of the sixth aspect, the receiving module is further configured to receive a cyclic prefix that is sent by the base station in a prefix time of an OFDM symbol in the fourth type of subframe The prefix of the orthogonal frequency division multiplexing CP-OFDM signal.

 In conjunction with the fourth possible implementation of the sixth aspect, in a fifth possible implementation manner of the sixth aspect, the CP-OFDM signal is an oversampled signal.

With reference to any one of the sixth aspect to the fifth possible implementation manner of the sixth aspect, in the sixth possible implementation manner of the sixth aspect, the receiving module is further configured to receive the a first pilot signal sent on a full-duplex time-frequency resource; wherein the first full-duplex time-frequency resource The second full-duplex time-frequency resource used by the at least one first terminal to send the second pilot signal to the base station is an orthogonal time-frequency resource.

 In conjunction with the sixth aspect, the fifth possible implementation manner of the sixth aspect, The fourth pilot signal sent on the four full-duplex time-frequency resources; wherein, on the fourth full-duplex time-frequency resource, the base station remains silent.

 In a seventh aspect, the present invention provides a base station, including:

 a receiver, configured to receive, by the at least one second terminal, a received signal strength of the first uplink reference signal that is reported by the second half-duplex uplink time-frequency resource; the received signal strength of the first uplink reference signal is the at least one The second terminal is obtained by measuring the first uplink reference signal sent by the at least one first terminal on the first half-duplex uplink time-frequency resource; and is further configured to receive, by the processor, the first terminal in the first terminal pair determined by the processor, The first signal sent by the configured full-duplex time-frequency resource;

 The processor is configured to determine, according to the received signal strength of the first uplink reference signal, a first terminal pair from the at least a first terminal and the at least one second terminal, where the first terminal pair includes The first terminal and the second terminal, the interference between the first terminal and the second terminal in the first terminal pair is less than a preset threshold; and according to the received signal strength of the first uplink reference signal, the full duplex time is The frequency resources are respectively configured to the first terminal and the second terminal in the first terminal pair;

 a transmitter, configured to send, by using a full-duplex time-frequency resource configured by the processor, a second signal to a second terminal in the first terminal pair;

 The processor is further configured to obtain a self-interference cancellation signal according to the self-interference channel parameter and the second signal on the full-duplex time-frequency resource to perform self-interference cancellation.

 With reference to the seventh aspect, in a first possible implementation manner of the seventh aspect, the transmitter is further configured to notify the at least one second terminal to measure a time-frequency resource, where the measured time-frequency resource includes a first half-duplex uplink time-frequency resource; and transmitting, to the at least one second terminal, a signal parameter of the first uplink reference signal; and a received signal strength of the first uplink reference signal is the at least one second The terminal obtains the measured on the measured time-frequency resource according to the signal parameter of the first uplink reference signal.

With reference to the seventh aspect, or the first possible implementation manner of the seventh aspect, in the second possible implementation manner of the seventh aspect, the half duplex downlink time-frequency resource includes a half-duplex downlink subframe and a S-sub-sub The prefix of the OFDM symbol in the downlink pilot time slot, the half-duplex downlink frequency band, and the fourth type of subframe of the frame At least one of the time.

 With reference to the second possible implementation manner of the seventh aspect, in a third possible implementation manner of the seventh aspect, the half duplex downlink subframe includes a fixed downlink subframe, where the fixed downlink subframe includes Subframe 0 and/or subframe 5.

 With reference to the second possible implementation manner of the seventh aspect, or the third possible implementation manner of the seventh aspect, in the fourth possible implementation manner of the seventh aspect, if the half duplex downlink time-frequency resource is At least one of a half-duplex downlink subframe, a half-duplex downlink frequency band, and a downlink pilot time slot of the S-subframe, the transmitter is further configured to be in the half-duplex downlink subframe, Transmitting, by the at least one of the half-duplex downlink frequency band and the downlink pilot time slot of the S subframe, a third signal to any terminal in the wireless communication system; Receiving, by the at least one resource in the half-duplex downlink subframe, the half-duplex downlink frequency band, and the downlink pilot time slot of the s subframe, the first received signal;

 The processor is specifically configured to obtain a self-interference channel parameter according to the ^:/^ +^, where the first received signal is used; and the base station performs self-interference channel estimation. The noise is; the ^ is the self-interference channel parameter; the is the third signal.

 In conjunction with the fourth possible implementation of the seventh aspect, in a fifth possible implementation of the seventh aspect, the first received signal and the third signal are oversampled signals.

 With reference to the second possible implementation manner of the seventh aspect, in a sixth possible implementation manner of the seventh aspect, if the half duplex downlink time-frequency resource is a prefix of an OFDM symbol in the fourth type of subframe The transmitter is further configured to send a prefix of a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) signal to the at least one second terminal within a prefix time of the OFDM symbol in the fourth type of subframe. The processor is further configured to: schedule, by the at least one first terminal, a prefix of a ZP-OFDM signal to the base station in a prefix time of the OFDM symbol in the fourth type of subframe; the receiver, Also used to receive the second received signal within a prefix time of an OFDM symbol in the fourth type of subframe;

 The processor is specifically configured to obtain a self-interference channel parameter according to 3^=^*4+^; wherein, the second received signal is used; and the self-interference channel estimation is performed by the base station Noise; the / ^ is the self-interference channel parameter; the prefix is the CP-OFDM signal.

With reference to the sixth possible implementation manner of the seventh aspect, in a seventh possible implementation manner of the seventh aspect, the second received signal and the CP-OFDM signal are oversampled signals. With reference to any one of the seventh aspect to the seventh possible implementation manner of the seventh aspect, in the eighth possible implementation manner of the seventh aspect, the transmitter is further configured to adopt the first full duplex Transmitting, by the time-frequency resource, the first pilot signal to the at least one second terminal;

 The receiver is further configured to receive, by using the second full-duplex time-frequency resource, the second pilot signal sent by the at least one first terminal, where the first full-duplex time-frequency resource and the second The full-duplex time-frequency resource is an orthogonal time-frequency resource.

 With reference to any one of the seventh aspect to the seventh possible implementation manner of the seventh aspect, in the ninth possible implementation manner of the seventh aspect, the receiver is further configured to adopt a third full duplex The time-frequency resource receives the third pilot signal sent by the at least one first terminal; wherein the transmitter remains silent on the third full-duplex time-frequency resource.

 With reference to the ninth possible implementation manner of the seventh aspect, in a tenth possible implementation manner of the seventh aspect, the transmitter is further configured to use the fourth full duplex time-frequency resource to the at least one The second terminal transmits a fourth pilot signal, where the processor controls the at least one first terminal to remain silent on the fourth full-duplex time-frequency resource.

 In an eighth aspect, the present invention provides a first terminal, including:

 a transmitter, configured to send a first uplink reference signal on the first half-duplex uplink time-frequency resource, so that the at least one second terminal measures the received signal strength of the first uplink reference signal, and the first uplink The received signal strength of the reference signal is reported to the base station by using the second half-duplex uplink time-frequency resource; and is further configured to send the first signal to the base station by using the full-duplex time-frequency resource; the full-duplex time-frequency resource is the base station according to the base station The received signal strength of the first uplink reference signal is configured to the first terminal and the second terminal in the first terminal pair, where the first terminal pair includes the first terminal and the second terminal, and the first terminal The interference between the first terminal and the second terminal in the pair is less than a preset threshold.

 With reference to the eighth aspect, in a first possible implementation manner of the eighth aspect, the first terminal further includes: a receiver, configured to receive a base station in a half duplex downlink subframe, a half duplex downlink frequency band, and a S sub A third signal transmitted on at least one of the downlink pilot time slots of the frame.

 With reference to the first possible implementation manner of the eighth aspect, in the second possible implementation manner of the eighth aspect, the half duplex downlink subframe includes a fixed downlink subframe, where the fixed downlink subframe includes Subframe 0 and/or subframe 5.

In conjunction with the first possible implementation of the eighth aspect, in a third possible implementation of the eighth aspect, the third signal is an oversampled signal. With reference to the eighth aspect, in a fourth possible implementation manner of the eighth aspect, the transmitter is further configured to send a zero prefix orthogonal to the base station in a prefix time of the OFDM symbol in the fourth type of subframe The prefix of the frequency division multiplexed ZP-OFDM signal.

 With reference to any one of the fourth aspect to the fourth possible implementation of the eighth aspect, in a fifth possible implementation manner of the eighth aspect, the transmitter is further configured to adopt a second full duplex Transmitting, by the time-frequency resource, the second pilot signal to the base station, where the second full-duplex time-frequency resource and the first full-length used by the base station to send the first pilot signal to the at least one second terminal The duplex time-frequency resource is an orthogonal time-frequency resource.

 With reference to any one of the fourth aspect to the fourth possible implementation of the eighth aspect, in a sixth possible implementation manner of the eighth aspect, the receiver is further configured to receive the base station adopting a The third pilot signal sent by the three full-duplex time-frequency resources; wherein, on the third full-duplex time-frequency resource, the base station remains silent.

 A ninth aspect, the present invention provides a second terminal, including:

 a transmitter, configured to send a received signal strength of the first uplink reference signal to the base station by using the second half-duplex uplink time-frequency resource, so that the base station performs full-duplex according to the received signal strength of the first uplink reference signal The time-frequency resources are respectively configured to the first terminal and the second terminal in the first terminal pair; the received signal strength of the first uplink reference signal is that the second terminal is in the first half duplex by measuring at least one first terminal Acquiring the first uplink reference signal sent on the uplink time-frequency resource; the first terminal pair is the received signal strength of the base station according to the first uplink reference signal from the at least first terminal and at least one And determining, by the first terminal, the first terminal and the second terminal, where interference between the first terminal and the second terminal in the first terminal pair is less than a preset threshold;

 And a receiver, configured to receive a second signal that is sent by the base station by using the full-duplex time-frequency resource. With reference to the ninth aspect, in a first possible implementation manner of the ninth aspect, the receiver is further configured to receive the downlink of the base station in a half-duplex downlink subframe, a half-duplex downlink frequency band, and an S subframe A third signal transmitted on at least one of the link pilot time slots.

 With reference to the first possible implementation manner of the ninth aspect, in the second possible implementation manner of the ninth aspect, the half duplex downlink subframe includes a fixed downlink subframe, where the fixed downlink subframe includes Subframe 0 and/or subframe 5.

In conjunction with the first possible implementation of the ninth aspect, the third possible implementation in the ninth aspect In the implementation manner, the third signal is an oversampled signal.

 With reference to the ninth aspect, in a fourth possible implementation manner of the ninth aspect, the receiver is further configured to receive a cyclic prefix that is sent by the base station in a prefix time of an OFDM symbol in the fourth type of subframe The prefix of the orthogonal frequency division multiplexing CP-OFDM signal.

 In conjunction with the fourth possible implementation of the ninth aspect, in a fifth possible implementation manner of the ninth aspect, the CP-OFDM signal is an oversampled signal.

 In conjunction with the ninth aspect, the fifth possible implementation manner of the ninth aspect, in the sixth possible implementation manner of the ninth aspect, the receiver is further configured to receive the base station a first pilot signal transmitted on a full-duplex time-frequency resource; wherein the first full-duplex time-frequency resource and the first pilot use the second pilot signal to send the second pilot signal to the base station The two full duplex time-frequency resources are orthogonal time-frequency resources.

 With reference to any one of the ninth aspect to the fifth possible implementation manner of the ninth aspect, in the seventh possible implementation manner of the ninth aspect, the receiver is further configured to receive the base station The fourth pilot signal sent on the four full-duplex time-frequency resources; wherein, on the fourth full-duplex time-frequency resource, the base station remains silent.

The method and device for canceling interference in a wireless communication system provided by an embodiment of the present invention, the base station performs self-interference channel estimation on a half-duplex downlink time-frequency resource to obtain a self-interference channel parameter; and the base station receives at least one second terminal through the second The received signal strength of the first uplink reference signal reported by the half-duplex uplink time-frequency resource, and the measured received signal strength of the first uplink reference signal is reported to the base station; the base station receives the signal strength according to the received signal from the first uplink reference signal. Determining a first terminal pair in the at least one first terminal and the at least one second terminal, and configuring the full duplex time-frequency resource to the first terminal and the second terminal in the first terminal pair, so that the two terminals work respectively Different half-duplex states ensure that the base station is in full-duplex state and perform self-interference cancellation. According to the method provided by the embodiment of the present invention, the base station allocates the full-duplex time-frequency resource to the first terminal and the second terminal in the first terminal pair according to the received signal strength of the first uplink reference signal, and reduces the first terminal. Interference to the second terminal when transmitting the first signal to the base station; at the same time, the base station performs self-interference channel estimation on the half-duplex downlink time-frequency resource, and performs self-interference cancellation when the base station is in the full-duplex state, so that The communication capacity of the system is improved. DRAWINGS In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

 1 is a schematic flow chart of Embodiment 1 of an interference cancellation method for a wireless communication system according to the present invention;

 2 is a schematic structural diagram of a wireless communication system provided by the present invention;

 FIG. 3 is a schematic flowchart of Embodiment 2 of an interference cancellation method for a wireless communication system according to the present invention;

 4 is another schematic flowchart of Embodiment 2 of an interference cancellation method for a wireless communication system according to the present invention;

 5 is a schematic structural diagram of a full-duplex transceiver in a base station according to an embodiment of the present invention; FIG. 6 is another schematic flowchart of Embodiment 2 of an interference cancellation method in a wireless communication system according to the present invention;

 FIG. 7 is a schematic diagram of OFDM symbol alignment provided by the present invention; FIG.

 FIG. 8 is a schematic diagram of another structure of a full-duplex transceiver in a base station according to an embodiment of the present invention; FIG. 9 is a schematic flowchart of Embodiment 3 of a method for canceling interference in a wireless communication system according to Embodiment 3 of the present invention;

 FIG. 10 is a schematic flowchart of Embodiment 4 of an interference cancellation method for a wireless communication system according to an embodiment of the present disclosure;

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

 FIG. 12 is a schematic structural diagram of Embodiment 2 of a first terminal according to an embodiment of the present invention; FIG. 13 is a schematic structural diagram of Embodiment 1 of a second terminal according to the present invention;

 FIG. 14 is a schematic structural diagram of Embodiment 2 of a base station according to the present invention;

 Figure 15 is a signal flow diagram 1 processed by the base station;

 Figure 16 is a signal flow diagram 1 processed by the base station;

 17 is a schematic structural diagram of Embodiment 4 of a first terminal according to the present invention;

FIG. 18 is a schematic structural diagram of Embodiment 2 of a second terminal according to the present invention. The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. The embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention. A base station (e.g., an access point) referred to in this application may refer to a device in an access network that communicates with a wireless terminal over one or more sectors over an air interface. The base station can be used to convert the received air frame to the IP packet as a router between the wireless terminal and the rest of the access network, wherein the remainder of the access network can include an Internet Protocol (IP) network. The base station can also coordinate attribute management of the air interface. For example, the base station may be any type of station in a heterogeneous scenario, such as a macro base station, a micro base station, a small cell base station, an access point, etc., which is not limited in this application.

 The technical solution related to the embodiment of the present invention is applicable to a wireless communication system, and the wireless communication system includes a base station and at least one terminal. In order to make the wireless communication system composed of the base station and the terminal operate in a full-duplex state, the base station needs to simultaneously schedule at least two terminals, one terminal is in a transmitting state (uplink signal transmission), and one terminal is in a receiving state (reception of a downlink signal) ), using the full duplex transceiver capability of the base station to increase channel capacity. Therefore, in the wireless communication system topology of the present invention, there are at least two types of interference in the system, one is self-interference caused by the transmitting signal of the internal full-duplex transceiver of the base station to the receiving signal of the base station itself, and the second is a certain When a terminal transmits a signal to a base station, the transmitted signal may cause interference to the downlink reception of another terminal, and the interference is called interference between terminals. In order to achieve the purpose of reducing or eliminating the above two types of interference, the present invention provides the technical solutions in the following embodiments.

 FIG. 1 is a schematic flow chart of Embodiment 1 of an interference cancellation method for a wireless communication system according to the present invention. The method is performed by the base station. As shown in FIG. 1, the method may include:

 S101: The base station performs self-interference channel estimation on the half-duplex downlink time-frequency resource, and acquires self-interference channel parameters.

Specifically, on the half-duplex downlink time-frequency resource, the signal received by the base station can be expressed as the formula 1: _yi - ht * _s t _{1 + ni} ; where, the receiving end of the base station is in the half-duplex downlink time-frequency resource The received signal obtained is a self-interference channel parameter, which is a signal that the base station transmits to the terminal on the half-duplex downlink time-frequency resource; and the noise when the base station performs self-interference channel estimation. It should be noted, When the base station performs self-interference channel estimation on the half-duplex downlink time-frequency resources, the signals that the base station can receive include only self-interference signals and noise. The terminal mentioned here may be any one of the above wireless communication systems, and the terminal does not send a signal to the base station on the half-duplex downlink time-frequency resources.

 The base station itself has a full-duplex transceiver, and can obtain the received signal ^ while transmitting 4, so the base station can adopt the traditional least squares (LS) or the least mean square according to the known 3 st. Min Mean Square Error (hereinafter referred to as MMSE) and other methods estimate the interference channel parameters, which is the formula.

 Optionally, the half-duplex downlink time-frequency resource may be a half-duplex downlink subframe, a half-duplex downlink frequency band, a half-duplex downlink time-frequency resource block, or a downlink of the S-subframe. The pilot time slot may also be a prefix time of the OFDM symbol in the fourth type of subframe, and may also be a downlink pilot time slot of the half-duplex downlink subframe, the half-duplex downlink frequency band, and the S subframe, and At least one of the prefix times of the OFDM symbols in the fourth type of subframe. The fourth type of subframe is a subframe that is used for both uplink and downlink transmission, and the fourth type of subframe is different from the existing downlink subframe, the uplink subframe, and the special subframe. The embodiment of the present invention does not limit the form of the half-duplex downlink time-frequency resource, as long as it can ensure that only the downlink signal transmission is used on the time-frequency resource, or the uplink signal is zero.

 Further, it should be noted that the step S101 may be after the following S102, or before S102, and S102 is before S103. The embodiment of the present invention does not limit the timing of S101, as long as it is ensured that S101 is before S106.

 S102: The base station receives, by the base station, a received signal strength of the first uplink reference signal that is reported by the second terminal by using the second half-duplex uplink time-frequency resource. The received signal strength of the first uplink reference signal is the at least one second terminal. Obtained by measuring the first uplink reference signal sent by the at least one first terminal on the first half-duplex uplink time-frequency resource.

Specifically, the base station schedules the at least one first terminal to send the first uplink reference signal on the first half-duplex uplink time-frequency resource. Optionally, the first half-duplex uplink time-frequency resource may be an uplink subframe, an uplink frequency band, or an uplink time-frequency resource block. Optionally, the base station can schedule one or more first terminals at the same time. When the base station simultaneously schedules multiple first terminals, the first terminals send the first uplink reference signal on the first half-duplex uplink time-frequency resource, and the first uplink reference signals are distinguishable. It should be noted that the first half-duplex uplink time-frequency resource may be used by the first terminal to send a signal, or may be used by the second terminal to receive the first uplink reference signal. number.

 The second terminal receives the first uplink reference signal on the first half-duplex uplink time-frequency resource, and measures the received signal strength of the first uplink reference signal to obtain the received signal strength of the first uplink reference signal. And transmitting, by the second half duplex uplink time-frequency resource, the received signal strength of the first uplink reference signal to the base station. It should be noted that the second half-duplex uplink time-frequency resource is different from the first half-duplex uplink time-frequency resource. If the first base station schedules multiple first terminals, the first uplink reference signals sent by the multiple first terminals are received by the second terminal, and the second terminal respectively receives the multiple first uplink reference signals. The signal strength is measured to obtain the received strengths of the plurality of first reference signals; and when reporting, the second terminal may send the received signal strengths of the plurality of first uplink reference signals to the base station, or may select one of the first The received signal strength of an uplink reference signal is reported to the base station.

 S103: The base station determines, according to the received signal strength of the first uplink reference signal, the first terminal pair from the at least the first terminal and the at least one second terminal, where the first terminal pair includes the first terminal and The second terminal, the interference between the first terminal and the second terminal in the first terminal pair is less than a preset threshold.

 Optionally, the base station may divide the terminals included in the wireless communication system into different terminal groups. Optionally, the terminal may be classified according to the current service status of the terminal. For example, for a terminal with more downlink data than the uplink data, the base station needs to allocate more downlink resources to the terminal in the time-frequency resource (that is, the number of downlink resources allocated to the terminal is greater than the number of uplink resources), and the terminal is also the base station division. The first terminal in the first terminal group; for the terminal with more uplink data than the data, the base station may allocate more uplink resources (that is, uplink resources allocated to the terminal) in the same time-frequency resource as the first terminal group. The number is greater than the number of downlink resources, and the terminal is the second terminal in the second terminal group divided by the terminal. Because the first terminal group and the second terminal group use the same time-frequency resource, the first terminal group has more downlink resources, and the second terminal group has more uplink resources, causing the first terminal and the second terminal. Some of the time-frequency resources are in the state of receiving and transmitting, respectively, so that the system is in full-duplex state and the channel capacity is increased.

Specifically, the wireless communication system may include a base station, at least one first terminal, and at least one second terminal. And the at least one first terminal and the at least one second terminal may form at least one terminal pair. If the base station divides the first terminal and the second terminal, the first terminal group and the second terminal group may be configured here. At least one terminal pair), each terminal pair includes at least one A terminal and at least one second terminal. For example: Referring to FIG. 2, it is assumed that the wireless communication system includes two first terminals (terminal A and terminal B) and one and a second terminal (terminal C), and the three terminals can form up to three terminal pairs, which are respectively terminals. Terminal pair 1 composed of A and terminal C, terminal pair 2 composed of terminal B and terminal C, and terminal pair 3 composed of terminal A, terminal B, and terminal C. That is, a terminal pair involved in the embodiment of the present invention may include at least two terminals.

 For convenience of description of the technical solution of the embodiment of the present invention, the network topology shown in FIG. 2 above is taken as an example. If the base station schedules the two first terminals (terminal A and terminal B), then three terminal pairs may be formed at this time, which are: terminal pair 1, terminal B, and terminal C composed of terminal A and terminal C. The terminal pair 2, and the terminal pair 3 composed of the terminals A and B and the terminal C. After receiving the received signal strength of the one or two first reference signals reported by the second terminal (terminal C) through the second half duplex uplink time-frequency resource, the base station selects the foregoing according to the received signal strength of the first uplink reference signal. The first terminal pair of the three terminal pairs, the first terminal pair is a terminal pair whose interference between the terminals of the three terminals is less than a preset threshold, and the base station selects interference from the three terminal pairs according to interference between the terminals. The terminal pair that is smaller than the preset threshold may be the first terminal pair, and the first terminal pair may be one or multiple.

 S104: The base station allocates the full-duplex time-frequency resources to the first terminal and the second terminal in the first terminal pair according to the received signal strength of the first uplink reference signal.

 S105: The base station receives a first signal that is sent by the first terminal in the first terminal pair by using the full-duplex time-frequency resource, and uses the full-duplex time-frequency resource to use the first terminal in the pair. The second terminal sends the second signal.

Specifically, with reference to FIG. 2 above, it is assumed that the base station selects the terminal pair 1 as the first terminal pair, and the base station allocates the full-duplex time-frequency resource allocation to the first terminal (terminal A) and the second terminal in the terminal pair 1. (terminal C), causing the first terminal (terminal A) in the terminal pair 1 to transmit the first signal to the base station by using the full-duplex time-frequency resource, and making the second terminal (terminal C) in the terminal pair 1 use the full The duplex time-frequency resource receives the second signal sent by the base station. Gp, the wireless communication system is operated in the full-duplex state, and the base station is working in the full-duplex state at this time, and the terminal A and the terminal C are respectively in the half-duplex transmission and reception state. It should be noted that the first signal here is that the first terminal (terminal A) transmits a signal to the base station on the full-duplex time-frequency resource, which is different from the i in the above S101; the second signal is that the base station utilizes full-duplex The signal transmitted by the time-frequency resource to the second terminal is different from that in the above S101. In addition, the base station allocates the full-duplex time-frequency resource to the first terminal and the second terminal in the first terminal pair, and because the interference between the two terminals is small, when the first terminal sends the first signal to the base station, The downlink receiving interference to the second terminal is small to avoid interference between the terminal and the terminal.

 S106: The base station acquires a self-interference cancellation signal according to the self-interference channel parameter and the second signal on the full-duplex time-frequency resource to perform self-interference cancellation.

Specifically, the base station performs reconstruction of the self-interference channel according to the self-interference channel parameter estimated in the foregoing S101, and performs convolution operation with the second signal sent by the base station to the second terminal on the full-duplex time-frequency resource to obtain self-interference. Eliminate the signal * w ₂ (the estimated and ^ may have a certain error); and according to the formula 2: y ₂ ^ ht * st ₂ + hr * sr - ht * st ₂ + n ₂ , you can eliminate self-interference So that the base station obtains the uplink signal that is expected to be received, and demodulates the uplink signal w. It should be noted that the sum of the self-interference cancellation signal * w and the formula 2 are both the second signal, and the second signal in the formula 2 is the first terminal transmitting to the base station on the full-duplex time-frequency resource, Hr is the wireless receiving channel parameter between the base station and the first terminal, which is the noise when the base station base station communicates on the full-duplex time-frequency resource.

 The interference cancellation method of the wireless communication system provided by the embodiment of the present invention, the base station performs self-interference channel estimation on the half-duplex downlink time-frequency resource to obtain the self-interference channel parameter; and the base station receives the at least one second terminal through the second half-double The received signal strength of the first uplink reference signal reported by the uplink time-frequency resource is reported, and the received signal strength of the measured first uplink reference signal is reported to the base station; and the base station receives the received signal strength according to the first uplink reference signal from the at least one Determining a first terminal pair in the first terminal and the at least one second terminal, and configuring the full duplex time-frequency resource to the first terminal and the second terminal in the first terminal pair, so that the two terminals work differently respectively The half-duplex state ensures that the base station is in full-duplex state and performs self-interference cancellation. According to the method provided by the embodiment of the present invention, the base station allocates the full-duplex time-frequency resource to the first terminal and the second terminal in the first terminal pair according to the received signal strength of the first uplink reference signal, and reduces the first terminal. Interference to the second terminal when transmitting the first signal to the base station; at the same time, the base station performs self-interference channel estimation on the half-duplex downlink time-frequency resource, and performs self-interference cancellation when the base station is in the full-duplex state, so that The communication capacity of the system is improved.

FIG. 3 is a schematic flowchart diagram of Embodiment 2 of an interference cancellation method for a wireless communication system according to the present invention. The embodiment relates to a specific process for measuring, by the at least one second terminal, the received signal strength of the first uplink reference signal on the first half-duplex uplink time-frequency resource. As shown in FIG. 3, the above S102 has Body includes:

 S201: The base station notifies the at least one second terminal to measure time-frequency resources, where the measured time-frequency resource includes the first half-duplex uplink time-frequency resource.

 For example, the base station allocates the measured time-frequency resource to the second terminal (terminal C), and the measured time-frequency resource may be a subframe, a frequency band, or a time-frequency resource block. The measured time-frequency resource may include the first half-duplex uplink time-frequency resource.

 S202: The base station sends the signal parameter of the first uplink reference signal to the at least one second terminal; the received signal strength of the first uplink reference signal is that the at least one second terminal is on the measured time-frequency resource Obtaining according to the signal parameter measurement of the first uplink reference signal.

 Specifically, after the terminal C receives the signal parameter of the first uplink reference signal sent by the base station, the terminal c restores the original first uplink reference signal sent by the first terminal according to the signal parameter of the first uplink reference signal, and the The original first uplink reference signal is correlated with the first uplink reference signal received by itself to obtain the received signal strength of the first uplink reference signal. Optionally, the signal parameter may be a sequence of the first uplink reference signal, an initial value of the sequence of the first uplink reference signal, a modulation mode of the first uplink reference signal, and the like.

The interference cancellation method of the wireless communication system provided by the embodiment of the present invention, the base station performs self-interference channel estimation on the half-duplex downlink time-frequency resource to obtain the self-interference channel parameter; and the base station includes the measurement by scheduling the at least one first terminal. The first uplink reference signal is sent on the first half-duplex uplink time-frequency resource of the time-frequency resource, and the second terminal measures the first uplink reference signal according to the signal parameter of the first uplink reference signal sent by the base station on the measured time-frequency resource. Receiving a signal strength, and reporting the measured received signal strength of the first uplink reference signal to the base station; the base station determining, according to the received signal strength of the first uplink reference signal, from the at least one first terminal and the at least one second terminal a terminal pair, and configuring the full-duplex time-frequency resource to the first terminal and the second terminal in the first terminal pair, so that the two terminals work in different half-duplex states respectively, ensuring that the base station is in a full-duplex state Next, perform self-interference cancellation. According to the method provided by the embodiment of the present invention, the base station allocates the full-duplex time-frequency resource to the first terminal and the second terminal in the first terminal pair according to the received signal strength of the first uplink reference signal, and reduces the first terminal. Interference to the second terminal when transmitting the first signal to the base station; at the same time, the base station performs self-interference channel estimation on the half-duplex downlink time-frequency resource, and performs self-interference cancellation when the base station is in the full-duplex state, so that The communication capacity of the system is improved. On the basis of the foregoing embodiments, as a possible implementation manner of the embodiment of the present invention, the embodiment relates to when the half-duplex downlink time-frequency resource is a half-duplex downlink subframe, and the half-duplex downlink When the frequency band and at least one of the downlink pilot time slots of the s subframe are used, the base station acquires a specific process of the self-interference channel parameter. Optionally, the at least one resource in the half-duplex downlink time-frequency resource, the half-duplex downlink frequency band, and the downlink pilot time slot of the S subframe may be referred to as training time. T. Optionally, the foregoing half-duplex downlink subframe includes a fixed downlink subframe, where the fixed downlink subframe includes a subframe 0 and/or a subframe 5. It should be noted that, when the half-duplex downlink time-frequency resource is at least one of a half-duplex downlink subframe, the half-duplex downlink frequency band, and an S-subframe downlink pilot time slot, S101 is located before S102. Further, as shown in FIG. 4, the method includes:

 S301: The base station sends, to the wireless communication system, any one of the half-duplex downlink subframe, the half-duplex downlink frequency band, and the downlink pilot time slot of the S subframe. The terminal sends a third signal.

 S302: The base station receives the first received signal on the at least one resource in the half-duplex downlink subframe, the half-duplex downlink frequency band, and the downlink pilot time slot of the S subframe.

 S303: The base station acquires a self-interference channel parameter according to the foregoing formula 1, where the signal is the first received signal, where the base station is performing self-interference channel estimation, and the /^ is the self-interference channel. The parameter is the third signal.

 Specifically, the third signal is sent by the base station to any terminal in the wireless communication system on at least one of a half-duplex downlink subframe, a half-duplex downlink frequency band, and a downlink pilot time slot of the S subframe. Therefore, the third signal is known to the base station; and the at least one resource in the half-duplex downlink subframe, the half-duplex downlink frequency band, and the downlink pilot time slot of the s subframe, the wireless communication system None of the terminals in the system send a signal to the base station. a first received signal obtained by the base station on at least one of a half-duplex downlink subframe and/or a half-duplex downlink frequency band and a downlink pilot time slot of the S subframe, for the base station, It is also known. Therefore, the base station can estimate the self-interference channel parameters according to Equation 1 (the actual value should be ).

FIG. 5 is a schematic structural diagram of a full-duplex transceiver in a base station according to an embodiment of the present invention. Unlike a conventional transceiver, a self-interference channel reconstruction module is connected across a transmitting and receiving antenna of a base station, and the module may be estimated according to a base station. The self-interference channel parameters are configured. During the training time, the data is taken from the transmitting end ^), and the receiving end takes the data ^), which can use common letters such as LS or MMSE. The road estimation method is estimated.

 It should be noted that the first received signal and the third signal may be any symmetric signals on the transmit link and the receive link. For example: If the base station takes the third signal between the prefix and the serial change module, the base station needs to take the first received signal between the parallel variable and the de-prefix. When the first received signal and the third signal are both oversampling signals, the oversampling multiples are the same, and the accuracy can be improved.

 The interference cancellation method of the wireless communication system provided by the embodiment of the present invention performs self-interference on the at least one resource in the half-duplex downlink subframe, the half-duplex downlink frequency band, and the downlink pilot time slot of the S subframe by the base station. Channel estimation to obtain a self-interference channel parameter; and the base station receives the received signal strength of the first uplink reference signal reported by the at least one second terminal through the second half-duplex uplink time-frequency resource, and receives the measured first uplink reference signal The signal strength is reported to the base station; the base station determines the first terminal pair from the at least one first terminal and the at least one second terminal according to the received signal strength of the first uplink reference signal, and configures the full duplex time-frequency resource to the first The first terminal and the second terminal in the terminal pair are configured to operate in different half-duplex states respectively to ensure that the base station is in a full-duplex state and perform self-interference cancellation. According to the method provided by the embodiment of the present invention, the base station allocates the full-duplex time-frequency resource to the first terminal and the second terminal in the first terminal pair according to the received signal strength of the first uplink reference signal, and reduces the first terminal. Interference to the second terminal when transmitting the first signal to the base station; at the same time, the base station performs self-interference channel estimation on the half-duplex downlink time-frequency resource, and performs self-interference cancellation when the base station is in the full-duplex state, so that The communication capacity of the system is improved. On the basis of the foregoing embodiments, as another possible implementation manner of the embodiment of the present invention, the embodiment relates to when the half-duplex downlink time-frequency resource is the prefix time of the OFDM symbol in the fourth type of subframe, the base station A specific process of obtaining self-interference channel parameters by self-interference channel estimation. It should be noted that, when the half-duplex downlink time-frequency resource is the prefix time of the OFDM symbol in the fourth type of subframe, S101 in the foregoing embodiment is located after S105. Further, as shown in FIG. 6, the method includes: S401: The base station sends a cyclic prefix orthogonal frequency division multiplexing to the at least one second terminal within a prefix time of the OFDM symbol in the fourth type of subframe. (Cyclic Prefix-orthogonal Frequency Division Multiplex, hereinafter referred to as CP-OFDM) The prefix of the signal.

S402: The base station schedules, by the at least one first terminal, an OFDM symbol in the fourth type of subframe. The prefix of the zero prefix-orthogonal Frequency Division Multiplex (hereinafter referred to as the Short Edge ZP-OFDM) signal is transmitted to the base station within the prefix time of the number.

Specifically, in the current wireless communication system, in order to avoid Inter Symbol Interference (hereinafter referred to as ISI) caused by a multipath channel, a prefix time is added before each OFDM symbol, and the prefix time is usually designed to be larger than the system. The transmission signal has a large delay difference from the first path and the maximum delay path of the wireless channel to the receiving end. For different design considerations, the CP-OFDM cyclic prefix OFDM signal can be transmitted within the prefix time, that is, the last N _ep samples of the OFDM symbol are copied into the prefix for transmission, and the entire OFDM symbol is the CP-OFDM signal, and the other is Nothing is transmitted during the prefix time, that is, the zero-prefix ODFM signal is sent within the prefix time, and the entire OFDM symbol is the ZP-OFDM signal (ie, ZP-OFDM is zero during this prefix time, outside this prefix time, ZP - OFDM is not zero).

 Therefore, the base station sends a prefix of the CP-OFDM signal to the at least one second terminal of the second terminal group (for example, the terminal C in FIG. 2) in the prefix time of the OFDM symbol in the fourth type of subframe, the CP. - the prefix of the OFDM signal is the following formula 1: y^ /^A + ; and scheduling at least one first terminal (terminal A and/or terminal B in the figure) in the first terminal group at the fourth The prefix of the ZP-OFDM signal is transmitted to the base station within the prefix time of the OFDM symbol in the class-like subframe, which is actually equivalent to the first terminal not transmitting a signal to the base station.

 In addition, when transmitting the prefix of the prefix ZP-OFDM signal of the CP-OFDM signal, the base station needs to ensure that the time at which the two symbols arrive at the base station in the transmission time is aligned, that is, the OFDM symbol is aligned, as shown in FIG. The time that the base station is used to make the self-interference channel estimation is as long as possible.

 S403: The base station receives the second received signal within a prefix time of the OFDM symbol in the fourth type of subframe.

 S404: The base station acquires a self-interference channel parameter according to the foregoing formula 1, where i in the formula 1 is the second received signal; the noise when the base station performs self-interference channel estimation; ht is a self-interference channel parameter; It is the prefix of the above CP-OFDM signal.

Specifically, since the prefix ( ) of the CP-OFDM signal is sent by the base station to the second terminal (terminal C) within the prefix time of the OFDM symbol in the fourth type of subframe, the prefix of the CP-OFDM signal is known to the base station. And within the prefix time of the OFDM symbol in the fourth type of subframe, The prefix of the ZP-OFDM signal transmitted by the terminal A and the terminal B to the base station is equivalent to the terminal A and the terminal B not transmitting signals to the base station. Therefore, the base station can estimate the self-interference channel parameters according to Equation 1.

 FIG. 8 is a schematic diagram of another structure of a full-duplex transceiver in a base station according to an embodiment of the present invention. A self-interference channel reconstruction module is connected between the transceiver antennas of the base station, and the module can be configured according to the self-interference channel parameters estimated by the base station. . The location of the data (i.e., the second received signal and the CP-OFDM signal) taken by the base station when performing self-interference channel estimation is shown in FIG. 8, and both the second received signal and the CP-OFDM signal may be oversampled signals. That is, the base station can take the CP-OFDM signal from the oversampling module in FIG. 8 and take the second received signal from the downsampling module to perform channel estimation. Since the sampling rate is high, the method for fetching data can be more accurately matched. The delay of the interference channel; optionally, the base station may also take the CP-OFDM signal from the oversampling module, and take the second received signal from the downsampling module to perform channel estimation. The method for obtaining the data has lower computational complexity. .

 In addition, if the entire OFDM symbol is received from the base station (that is, the base station receives not only the signal within the prefix time but also the signal received outside the prefix time, the signal received by the base station at this time can be expressed as Υ '), because the wireless channel has the characteristics of multipath delay (the wireless channel can be a self-interference channel ^ or the above-mentioned wireless receiving channel. The above can be equivalent to fe =, -,) (Formula 3); L is the multipath number of the self-interference channel. When L=l, it means that only one path exists in the self-interference channel. It represents the complex envelope corresponding to the first path, and 0 is the Dirac function, indicating that the delay corresponding to the i-th path, τ, is successively increased. For ^, it can also be equivalent to the form of ^, the difference is that the specific parameters of the self-interference channel and the wireless receiving channel are different, such as multipath L, multipath delay, multipath amplitude and phase.

Since the interference channels from the maximum propagation delay time [tau] _£ cyclic prefix for the remote transmission system design [tau] _ratio; Χ Λ ^ much smaller; wherein, N _ep is the number of prefixes included in the sampling time point, T _s For the sampling interval, the multiplication is the prefix time, and τ _£ = T _s xN _cp . It is assumed here that τ is an integer multiple of the sampling point Ts, then ^ can represent T _£ = Pr _s (Equation 4), where P is an integer and P = N _cp . For example, taking the LTE design as an example, the CP-OFDM signal used in LTE has a prefix length of 144*T _s = 144* l/30.72e6 = 4.6875 s = 4687.5 ns. In the 802.11a design, the prefix time is s=1000 ns. For the self-interference channel, the propagation delay is related to the distance between the transmitting and receiving antennas. When the transmitting and receiving antenna distance is 10 cm, the optical speed is 3e8m/s, and the delay τ _£ is 10e-2/3e8=3.3e-10s=330ps; When the transmitting and receiving antenna distance is lm, the delay τ _£ may be l/3e8=0.33e-8ns=33ns. In addition, the maximum propagation delay τ _£ is related to the reflector, but it is also Within 100ns. From this you can see τ _£ = 7; χΛ , then Ρ = Λ ^.

 Suppose that the received signal Y' taken by the base station at its receiving end is the kth OFDM symbol (this

The OFDM symbol includes the above-mentioned second received signal), that is, the above Y' can be expressed in the form of a vector, see Equation 5 below, so Y' at this time actually includes not only the prefix time of the OFDM symbol in the fourth type of subframe described above. The data of N _ep sampling points in the data also includes the data of N sampling points outside the prefix time. Meanwhile, in the following formula 5, _s " sr, ht, ^ are all in the form of a vector, where is the self-interference channel parameter; the w is a CP sent by the base station to the at least one second terminal An OFDM signal (the CP-OFDM signal includes a prefix and data), ^ is a wireless receive link channel parameter between the at least one first terminal and the base station; ^ is sent by the at least one first terminal acquired by the base station ZP-OFDM signal (the ZP-OFDM signal also includes the prefix and the data, except that the prefix portion is zero); and the pre-N _ep of Y' in Equation 5 acts as the second received signal in the above embodiment, that is, the base station is in the prefix The signal sent by the first terminal received in the time; and the zero part of ^ is the prefix of the ZP-OFDM signal sent by the first terminal in the prefix time, and the part which is not zero in the time is the data in the ZP-OFDM signal When the first P samples in w(fc-l) are affected by the multipath of the self-interference channel, the k-1th OFDM symbol introduces the interference of Y'. Equation 5 is specifically:

y ₀ '(k)

 M

 M

yN+N _cp -ll(W+W.,)xl

M

 + M

M nN _cp -l( ^k )

nN _cp ( ^k )

 M

In Equation 5, the maximum propagation time of the self-interference channel is much less than that before the transmission of the CP. The length of the time is 7 N„, so in the vector representation of /^ in Equation 5, only the former P has a value, and the rest are

Zero, ie. Then the above formula

In fact, it can be converted into the following formula 6 (that is, the data of the N _ep sampling points in the prefix time is taken for self-interference channel estimation, and the data of the N _e sampling points in the pre-fixing time is the pre-N _e in the formula 5 c _D line I):

的值约等于 0， 并且仅取公式 6的后面 N_ep-P行， 可以进一歩转换为下述 公式 7 :

In the above formula 6,

The value is approximately equal to 0, and only the following N _ep -P lines of Equation 6 can be further converted to Equation 7 below:

Ht^k)

What needs to be solved in Equation 7 is that there are at most (N _ra -P) equations that can be used for

 M

Solution, and as long as (Ncp-P) is greater than P+1, the equation has a solution. Since ZP-OFDM causes many components to be zero in the received signal during the prefix time, and considering the far-field channel (ie, the wireless receiving channel), the path energy attenuation with less delay is stronger, so it can be approximated to zero. The components in w are known to the base station, and the component base stations in Y' are also known, so they can be estimated by conventional methods such as LS and MMSE. Moreover, in the above (Ncp-P) equations, the smaller the influence in the later equation, the more the equation, the smaller the estimation error. The interference cancellation method of the wireless communication system provided by the embodiment of the present invention, the self-interference channel estimation is performed by the base station in the prefix time of the OFDM symbol in the fourth type of subframe to obtain the self-interference channel parameter; and the at least one second terminal is received. The received signal strength of the first uplink reference signal reported by the second half of the uplink uplink time-frequency resource, and the measured received signal strength of the first uplink reference signal is reported to the base station; the base station receives the received signal strength according to the first uplink reference signal. Determining the first terminal pair in the at least one first terminal and the at least one second terminal, and configuring the full duplex time-frequency resource to the first terminal and the second terminal in the first terminal pair, so that the two terminals work separately In different half-duplex states, ensure that the base station is in full-duplex state and perform self-interference cancellation. According to the method provided by the embodiment of the present invention, the base station allocates the full-duplex time-frequency resource to the first terminal and the second terminal in the first terminal pair according to the received signal strength of the first uplink reference signal, and reduces the first terminal. Interference to the second terminal when transmitting the first signal to the base station; meanwhile, the base station passes The self-interference channel estimation is performed on the half-duplex downlink time-frequency resources, and the self-interference is eliminated when the base station is in the full-duplex state, so that the communication capacity of the system is improved. On the basis of the foregoing embodiment, as a third possible implementation manner of the embodiment of the present invention, the method in this embodiment is to separately transmit and receive a pilot signal by using a quadrature full-duplex time-frequency resource by a base station, Reducing residual self-interference (residual transmitter signal) affects the base station's wireless receive channel/^ estimation. The method may include: the base station transmitting, by using the first full-duplex time-frequency resource, the first pilot signal to the at least one second terminal, and receiving, by using the second full-duplex time-frequency resource, the sending by the at least one first terminal a second pilot signal; wherein the first full duplex time-frequency resource and the second full-duplex time-frequency resource are orthogonal time-frequency resources.

Specifically, the signal w sent by the base station to the second terminal may include the first pilot signal in addition to the data, and the signal sent by the first terminal received by the base station includes data (the base station needs to demodulate the data). Also includes a second pilot signal. Therefore, after the self-interference cancellation is performed by the base station (assuming self-interference is completely eliminated), according to Equation 2, the signal after the self-interference cancellation by the base station is y ^ hr * sr ₊ n ₂ (Equation 8), and the base station extracts the second from w. The pilot signal is estimated by using the second pilot signal, and then the base station can correctly demodulate the data in the second pilot signal according to the second pilot signal.

However, when the self-interference channel parameter is estimated to have a certain error with the original self-interference channel of the base station, the *W ₂ in Equation ₂ cannot be completely cancelled, and a part of the self-interference (RI) is left. , the above formula 8 should actually be the formula 9: y ^ hr * sr + (ht - ht) * st ₂ + n ^ hr * sr + RI + n _{2 0} and remain in the time frequency of the second pilot signal The RI on the resource will cause a large error to the receiving end to the radio receiving channel/^ estimation, thereby affecting the correct demodulation of the data in the base station pair.

Therefore, in order to reduce the RL remaining on the second full-duplex time-frequency resource, the power on the second full-duplex time-frequency resource can be reduced. Since the data includes not only the data signal sent by the base station to the second terminal but also the first pilot signal sent by the base station to the second terminal, the power of the data signal is generally smaller than the power of the pilot signal, and therefore, only the first terminal sends On the second full-duplex time-frequency resource of the second pilot signal, the base station sends the data signal of the second terminal to the second terminal on the second full-duplex time-frequency resource, so that the second full-duplex can be reduced. The power on the frequency resources, thereby reducing the residual interference RI. Therefore, this embodiment provides the following technical solutions: In the embodiment of the present invention, the base station Transmitting the first pilot signal by using the first full-duplex time-frequency resource, and receiving the second pilot signal sent by the at least one first terminal by using the second full-duplex time-frequency resource, and the first full-duplex time The frequency resource and the second full duplex time-frequency resource may be orthogonal time-frequency resources in the form of time division, frequency division or code division. The method of time division or frequency division makes the corresponding data on the second full-duplex time-frequency resource be the data signal sent by the base station to the second terminal. Generally, the power of the data signal is smaller than the pilot signal, so residual interference can be reduced. When the first full-duplex time-frequency resource and the second full-duplex time-frequency resource are code-divided orthogonal time-frequency resources, that is, the pilot signal (second pilot signal) of the base station's received signal and the base station's transmission The pilot signals (first pilot signals) of the signals share the same full-duplex time-frequency resource, and the first pilot signals and the second pilot signals are spread by orthogonal codes, and the residual interference can be cancelled by despreading.

 According to the method provided by the embodiment of the present invention, the base station sends the first pilot signal by using the first full-duplex time-frequency resource that is orthogonal to each other, and receives the second pilot signal by using the second full-duplex time-frequency resource, which is reduced. The residual signal (residual data signal or residual pilot signal) at the transmitting end of the base station interferes with the base station correctly demodulating the data in the received signal. On the basis of the foregoing embodiment, in a fourth possible implementation manner of the embodiment of the present invention, the method in this embodiment is that the base station receives the full duplex time of the third pilot signal sent by the at least one first terminal. The specific process of keeping the frequency on the frequency to reduce the influence of self-interference on the pilot signal.

 Specifically, the base station may receive the third pilot signal sent by the at least one first terminal by using the third full-duplex time-frequency resource, where the base station remains silent on the third full-duplex time-frequency resource, that is, the base station is in the The third full-duplex time-frequency resource does not send a signal to at least one second terminal to avoid interference caused by self-interference to the base station to correctly demodulate data in the received signal.

 According to the method provided by the embodiment of the present invention, the base station does not transmit a signal to the second terminal on the pilot resource that receives the third pilot signal sent by the first terminal, and reduces residual self-interference to correctly demodulate the received signal in the base station. The interference caused by the data.

Further, based on the fourth possible implementation manner, in a fifth possible implementation manner of the embodiment of the present invention, the method in this embodiment is that the base station is in the fourth full-duplex time-frequency resource direction. Controlling, by the at least one second terminal, the fourth pilot signal, the at least one first terminal to remain silent on the fourth full-duplex time-frequency resource, to avoid self-interference to the pilot signal The specific process of the impact of the number.

 Specifically, the base station uses the fourth full-duplex time-frequency resource to transmit the fourth pilot signal to the at least one second terminal, where the base station controls the at least one first terminal to remain on the fourth full-duplex time-frequency resource. Silent. That is, the at least one first terminal does not send a signal to the base station on the fourth full-duplex time-frequency resource, and reduces the influence of the transmission signal of the at least one first terminal on the self-interference channel estimation of the base station.

 According to the method provided by the embodiment of the present invention, the base station controls the first terminal not to transmit a signal to the base station on the pilot resource that sends the fourth pilot signal to the second terminal, thereby avoiding the transmission signal of the at least one first terminal to the base station. The impact of self-interference channel estimation. FIG. 9 is a schematic flowchart of Embodiment 3 of an interference cancellation method for a wireless communication system according to Embodiment 3 of the present invention. The execution body of the method is the first terminal. The method includes:

 S501: The first terminal sends a first uplink reference signal on the first half-duplex uplink time-frequency resource, so that the at least one second terminal measures the received signal strength of the first uplink reference signal, and the first uplink is The received signal strength of the reference signal is reported to the base station through the second half-duplex uplink time-frequency resource.

 Specifically, the base station schedules the at least one first terminal to send the first uplink reference signal on the first half-duplex uplink time-frequency resource. Optionally, the first half-duplex uplink time-frequency resource may be an uplink subframe, an uplink frequency band, or an uplink time-frequency resource block. Optionally, the base station can schedule one or more first terminals at the same time. When the base station simultaneously schedules multiple first terminals, the first terminals send the first uplink reference signal on the first half-duplex uplink time-frequency resource, and the first uplink reference signals are distinguishable. It should be noted that the first half-duplex uplink time-frequency resource may be used by the first terminal to send a signal, or may be used by the second terminal to receive the first uplink reference signal.

The second terminal receives the first uplink reference signal on the first half-duplex uplink time-frequency resource, and measures the received signal strength of the first uplink reference signal to obtain the received signal strength of the first uplink reference signal. And transmitting, by the second half duplex uplink time-frequency resource, the received signal strength of the first uplink reference signal to the base station. It should be noted that the second half-duplex uplink time-frequency resource is different from the first half-duplex uplink time-frequency resource. If the first base station schedules a plurality of first terminals, the first uplink reference signals sent by the multiple first terminals are received by the second terminal, and the second terminal respectively Measure the received signal strengths of the plurality of first uplink reference signals to obtain the received strengths of the plurality of first reference signals; and when reporting, the second terminal may obtain the received signal strengths of the plurality of first uplink reference signals. The received signal strength of one of the first uplink reference signals may be reported to the base station.

 S502: The first terminal sends a first signal to the base station by using the full-duplex time-frequency resource; the full-duplex time-frequency resource is configured by the base station according to the received signal strength of the first uplink reference signal to the first terminal. The first terminal and the second terminal, where the first terminal pair includes the first terminal and the second terminal, and the interference between the first terminal and the second terminal in the first terminal pair is less than a preset threshold.

 Specifically, the first terminal is a first terminal of the first terminal pair, and the first terminal pair is determined by the base station according to the received signal strength of the first uplink reference signal, the first terminal and the first terminal in the first terminal pair The interference between the two terminals is less than the preset threshold. For details, refer to the foregoing embodiment 1.

S102-S105 is not described here.

 The base station allocates the full-duplex time-frequency resource to the first terminal and the second terminal in the first terminal pair. Because the interference between the two terminals is small, when the first terminal sends the first signal to the base station, The downlink receiving interference of the two terminals is small to avoid interference between the terminal and the terminal.

 Further, the base station can perform self-interference channel estimation by using half-duplex downlink time-frequency resources, and obtain self-interference channel parameters, so that self-interference signal cancellation can be performed according to the second signal and the acquired self-interference channel parameters. For details, refer to the descriptions of S101 and S106 above, and details are not described herein again.

In the interference cancellation method of the wireless communication system provided by the embodiment of the present invention, the first terminal sends the first uplink reference signal on the first half-duplex uplink time-frequency resource, so that the at least one second terminal measures the reception of the first uplink reference signal. a signal strength, and the received signal strength of the first uplink reference signal is reported to the base station by using the second half-duplex uplink time-frequency resource, so that the base station obtains the received signal strength according to the first uplink reference signal from the at least one first terminal and Determining a first terminal pair in the at least one second terminal, and configuring the full-duplex time-frequency resource to the first terminal and the second terminal in the first terminal pair, so that the two terminals respectively work in different half-duplex states Ensure that the base station is in full-duplex state and perform self-interference cancellation. The method provided by the embodiment of the present invention reduces interference of the first terminal to the second terminal when transmitting the first signal to the base station; meanwhile, the base station performs self-interference channel estimation on the half-duplex downlink time-frequency resource, and The self-interference cancellation is performed when the base station is in the full-duplex state, so that the communication capacity of the system is improved. On the basis of the foregoing embodiments, as a possible implementation manner of the embodiment of the present invention, the embodiment relates to when the half-duplex downlink time-frequency resource is a half-duplex downlink subframe, and the half-duplex downlink The first terminal receives the downlink pilot time slot of the base station in the half-duplex downlink subframe, the half-duplex downlink frequency band, and the S subframe when the frequency band and the at least one resource in the downlink pilot time slot of the s subframe are The third signal transmitted on at least one of the resources, so that the base station acquires a specific process of the self-interfering channel parameter. Optionally, the half-duplex downlink time-frequency resource is at least one of a half-duplex downlink subframe, the half-duplex downlink frequency band, and a downlink pilot time slot of the S subframe, which may be referred to as training. Time T. Optionally, the foregoing half-duplex downlink subframe includes a fixed downlink subframe, where the fixed downlink subframe includes a subframe 0 and/or a subframe 5.

Specifically, the first terminal receives the third signal sent by the base station on at least one of a downlink pilot subframe, a half-duplex downlink frequency band, and a downlink pilot time slot of the s subframe, and the base station is Receiving, by the half-duplex downlink subframe, the half-duplex downlink frequency band, and at least one of the downlink pilot frequency slots of the s subframe, the first received signal (at this time, any terminal of the wireless communication system is half) The signal is not sent to the base station on the duplex downlink time-frequency resources. The first received signal here only includes the self-interference signal and the noise. The base station obtains according to the formula 1 in the above embodiment: y^ ht * _s t _{1 + ni} Self-interference channel parameters.

 The third signal A is sent by the base station to any terminal in the wireless communication system on at least one of a half-duplex downlink subframe, a half-duplex downlink frequency band, and a downlink pilot time slot of the S subframe. Therefore, the third signal is known to the base station; and in at least one of the half-duplex downlink subframe, the half-duplex downlink frequency band, and the downlink pilot time slot of the S subframe, in the wireless communication system None of the terminals sent a signal to the base station. a first received signal obtained by the base station on at least one of a half-duplex downlink subframe and/or a half-duplex downlink frequency band and a downlink pilot time slot of the s subframe, for the base station, It is also known. Therefore, the base station can estimate the self-interference channel parameters according to Equation 1 (the actual value should be ).

 Moreover, when both the first received signal and the third signal are oversampled signals, the oversampling multiples are the same, and the accuracy can be improved.

In the interference cancellation method of the wireless communication system provided by the embodiment of the present invention, the first terminal sends the first uplink reference signal on the first half-duplex uplink time-frequency resource, so that the at least one second terminal measures the reception of the first uplink reference signal. Signal strength, and the received signal of the first uplink reference signal The strength is reported to the base station by using the second half-duplex uplink time-frequency resource, so that the base station determines the first terminal pair from the at least one first terminal and the at least one second terminal according to the received signal strength of the first uplink reference signal, and Allocating the full-duplex time-frequency resource to the first terminal and the second terminal in the first terminal pair, so that the two terminals work in different half-duplex states respectively, ensuring that the base station is in full-duplex state and performing self-interference eliminate. The method provided by the embodiment of the present invention reduces interference of the first terminal to the second terminal when transmitting the first signal to the base station; meanwhile, the base station performs self-interference channel estimation on the half-duplex downlink time-frequency resource, and The self-interference cancellation is performed when the base station is in the full-duplex state, so that the communication capacity of the system is improved. On the basis of the foregoing embodiments, as another possible implementation manner of the embodiment of the present invention, the embodiment relates to when the half-duplex downlink time-frequency resource is the prefix time of the OFDM symbol in the fourth type of subframe, A terminal sends a prefix of a zero-prefix Orthogonal Frequency Division Multiplexing (ZP-OFDM) signal to the base station within a prefix time of the OFDM symbol in the fourth type of subframe, so that the base station acquires a specific process of the self-interfering channel parameter.

Specifically, the first terminal sends a prefix of the ZP-OFDM signal to the base station in a prefix time of the OFDM symbol in the fourth type of subframe, and the base station sends the prefix of the OFDM symbol in the fourth type of subframe. The at least one second terminal transmits a prefix of the CP-OFDM signal. In the current wireless communication system, in order to avoid inter-OFDM interference ISI caused by multipath channels, a prefix time is added before each OFDM symbol, and the prefix time is usually designed to be larger than the first path of the system through the transmission channel of the wireless channel. The delay difference between the maximum delay path and the receiving end is large. For different design considerations, the CP-OFDM cyclic prefix OFDM signal can be transmitted within the prefix time, that is, the last N _ep samples of the OFDM symbol are copied into the prefix for transmission, and the entire OFDM symbol is a CP-OFDM signal, and another is Nothing is transmitted during the prefix time, that is, the zero-prefix ODFM signal is sent within the prefix time, and the entire OFDM symbol is the ZP-OFDM signal (ie, ZP-OFDM is zero during this prefix time, outside this prefix time, ZP - OFDM is not zero).

Therefore, the base station sends a prefix of the CP-OFDM signal to the at least one second terminal of the second terminal group (for example, the terminal C in FIG. 2) in the prefix time of the OFDM symbol in the fourth type of subframe, the CP. - the prefix of the OFDM signal is the following formula 1: y^ /^A + ; and scheduling at least one first terminal (terminal A and/or terminal B in the figure) in the first terminal group The prefix of the ZP-OFDM signal is transmitted to the base station within the prefix time of the OFDM symbol in the fourth type of subframe, which is actually equivalent to the first terminal not transmitting a signal to the base station.

 Therefore, the base station can obtain the self-interference channel parameter according to the second received signal and the formula 1 in the prefix time of the OFDM symbol in the fourth type of subframe, where the base station performs self-interference channel estimation. Noise; is the self-interference channel parameter; is the prefix of the above CP-OFDM signal. On the basis of the foregoing embodiment, as a third possible implementation manner of the embodiment of the present invention, the method in this embodiment is to separately transmit and receive a pilot signal by using a quadrature full-duplex time-frequency resource by a base station, Reducing residual self-interference (residual transmitter signal) affects the base station's wireless receive channel/^ estimation. The method may include: sending, by the first terminal, a second pilot signal to the base station by using a second full-duplex time-frequency resource; wherein, the second full-duplex time-frequency resource and the base station are to the at least one The first full-duplex time-frequency resource used by the second terminal to send the first pilot signal is an orthogonal time-frequency resource.

Specifically, the signal w sent by the base station to the second terminal may include the first pilot signal in addition to the data, and the signal sent by the first terminal received by the base station includes data (the base station needs to demodulate the data). Also includes a second pilot signal. Therefore, after the self-interference cancellation is performed by the base station (assuming self-interference is completely eliminated), according to Equation 2, the signal after the self-interference cancellation by the base station is y - hr * sr ₊ n ₂ (Equation 8), and the base station extracts the second from w The pilot signal is estimated by using the second pilot signal, and then the base station can correctly demodulate the data in w according to the second pilot signal and the ^.

However, when the self-interference channel parameter is estimated to have a certain error with the original self-interference channel of the base station, the *w ₂ in Equation ₂ cannot be completely cancelled, and a part of the self-interference (RI) is left. , Equation 8 above should actually be the formula 9: y = hr * sr + (ht - ϋή * st ₂ + n = hr * sr + RI + n ₂ .) Time-frequency resources remaining in the second pilot signal The upper RI will cause a large error to the receiving end to the radio receiving channel/^ estimation, thereby affecting the correct demodulation of the data in the base station pair.

Therefore, in order to reduce the RL remaining on the second full-duplex time-frequency resource, the power on the second full-duplex time-frequency resource can be reduced. Since the ^ includes not only the data signal sent by the base station to the second terminal, but also the first pilot signal sent by the base station to the second terminal, usually the work of the data signal The rate is less than the power of the pilot signal. Therefore, the base station sends the second full-duplex time-frequency resource to the second terminal on the second full-duplex time-frequency resource of the first terminal. The data signal in the middle can reduce the power on the second full-duplex time-frequency resource, thereby reducing the residual interference RI. Therefore, the embodiment provides the following technical solutions: In the embodiment of the present invention, the base station uses the first full-duplex time-frequency resource to transmit the first pilot signal, and the second full-duplex time-frequency resource to receive at least one The second pilot signal sent by the first terminal, and the first full-duplex time-frequency resource and the second full-duplex time-frequency resource may be orthogonal time-frequency resources in the form of time division, frequency division or code division. The method of time division or frequency division makes the corresponding data on the second full-duplex time-frequency resource be the data signal sent by the base station to the second terminal. Generally, the power of the data signal is smaller than the pilot signal, so residual interference can be reduced. When the first full-duplex time-frequency resource and the second full-duplex time-frequency resource are code-divided orthogonal time-frequency resources, that is, the pilot signal (second pilot signal) of the base station's received signal and the base station's transmission The pilot signals (first pilot signals) of the signals share the same full-duplex time-frequency resource, and the first pilot signals and the second pilot signals are spread by orthogonal codes, and the residual interference can be cancelled by despreading.

 According to the method provided by the embodiment of the present invention, the first terminal sends the second pilot signal to the base station by using the second full-duplex time-frequency resource, and the base station sends the first full-duplex time-frequency resource by using the same A pilot signal reduces the interference caused by the base station's residual signal (residual data signal or residual pilot signal) to correctly demodulate the data in the received signal. On the basis of the foregoing embodiment, as a fourth possible implementation manner of the embodiment of the present invention, the method in this embodiment is that the first terminal receives the third base station that uses the third full-duplex time-frequency resource to send. a pilot signal; wherein, in the third full-duplex time-frequency resource, the base station remains silent to reduce a specific process of self-interference affecting the pilot signal.

 Specifically, the first terminal receives the third pilot signal that is sent by the base station by using the third full-duplex time-frequency resource, where the base station remains silent on the third full-duplex time-frequency resource, that is, the base station is in the The three full-duplex time-frequency resources do not send signals to at least one second terminal to avoid interference caused by self-interference to the base station to correctly demodulate data in the received signal.

According to the method provided by the embodiment of the present invention, the base station does not transmit a signal to the second terminal on the pilot resource that receives the third pilot signal sent by the first terminal, and reduces residual self-interference to correctly demodulate the received signal in the base station. The interference caused by the data. FIG. 10 is a schematic flowchart diagram of Embodiment 4 of an interference cancellation method in a wireless communication system according to an embodiment of the present invention. As shown in FIG. 10, the execution body of the method is a second terminal. The method includes: S601: The second terminal sends the received signal strength of the first uplink reference signal to the base station by using the second half-duplex uplink time-frequency resource, so that the base station according to the received signal strength of the first uplink reference signal, Configuring the full-duplex time-frequency resource to the first terminal and the second terminal in the first terminal pair respectively; the received signal strength of the first uplink reference signal is that the second terminal measures at least one first terminal by using Acquiring the first uplink reference signal sent on the half-duplex uplink time-frequency resource; the first terminal pair is the received signal strength of the base station according to the first uplink reference signal from the at least first terminal And determining, by the at least one second terminal, the first terminal pair includes the first terminal and the second terminal, and the interference between the first terminal and the second terminal in the first terminal pair is less than a preset threshold.

 Specifically, the base station schedules the at least one first terminal to send the first uplink reference signal on the first half-duplex uplink time-frequency resource. Optionally, the first half-duplex uplink time-frequency resource may be an uplink subframe, an uplink frequency band, or an uplink time-frequency resource block. Optionally, the base station can schedule one or more first terminals at the same time. When the base station simultaneously schedules multiple first terminals, the first terminals send the first uplink reference signal on the first half-duplex uplink time-frequency resource, and the first uplink reference signals are distinguishable. It should be noted that the first half-duplex uplink time-frequency resource may be used by the first terminal to send a signal, or may be used by the second terminal to receive the first uplink reference signal.

The second terminal receives the first uplink reference signal on the first half-duplex uplink time-frequency resource, and measures the received signal strength of the first uplink reference signal to obtain the received signal strength of the first uplink reference signal. And transmitting, by the second half duplex uplink time-frequency resource, the received signal strength of the first uplink reference signal to the base station. It should be noted that the second half-duplex uplink time-frequency resource is different from the first half-duplex uplink time-frequency resource. If the first base station schedules multiple first terminals, the first uplink reference signals sent by the multiple first terminals are received by the second terminal, and the second terminal respectively receives the multiple first uplink reference signals. The signal strength is measured to obtain the received strengths of the plurality of first reference signals; and when reporting, the second terminal may send the received signal strengths of the plurality of first uplink reference signals to the base station, or may select one of the first The received signal strength of an uplink reference signal is reported to the base station. S602: The second terminal in the first terminal pair receives the second signal sent by the base station by using the full-duplex time-frequency resource.

 Specifically, the second terminal is a second terminal of the first terminal pair, where the first terminal pair is determined by the base station according to the received signal strength of the first uplink reference signal, and the first terminal and the first terminal in the first terminal pair The interference between the two terminals is less than the preset threshold. For details, refer to S102-S105 in the foregoing Embodiment 1, and details are not described herein again.

 The base station allocates the full-duplex time-frequency resource to the first terminal and the second terminal in the first terminal pair. Because the interference between the two terminals is small, when the first terminal sends the first signal to the base station, The downlink receiving interference of the two terminals is small to avoid interference between the terminal and the terminal.

 Further, the base station can perform self-interference channel estimation by using half-duplex downlink time-frequency resources, and obtain self-interference channel parameters, so that self-interference signal cancellation can be performed according to the second signal and the acquired self-interference channel parameters. For details, refer to the descriptions of S101 and S106 in the foregoing Embodiment 1, and details are not described herein again.

In the interference cancellation method of the wireless communication system provided by the embodiment of the present invention, the second terminal sends the received signal strength of the first uplink reference signal to the base station by using the second half-duplex uplink time-frequency resource, so that the base station according to the first uplink reference The received signal strength of the signal is configured to allocate the full-duplex time-frequency resources to the first terminal and the second terminal in the first terminal pair, so that the two terminals respectively work in different half-duplex states, ensuring that the base station is in full double In the working state, self-interference cancellation is performed. According to the method provided by the embodiment of the present invention, the base station allocates the full-duplex time-frequency resource to the first terminal and the second terminal in the first terminal pair according to the received signal strength of the first uplink reference signal, and reduces the first terminal. Interference to the second terminal when transmitting the first signal to the base station; at the same time, the base station performs self-interference channel estimation on the half-duplex downlink time-frequency resource, and performs self-interference cancellation when the base station is in the full-duplex state, so that The communication capacity of the system is improved. On the basis of the foregoing embodiments, as a possible implementation manner of the embodiment of the present invention, the embodiment relates to when the half-duplex downlink time-frequency resource is a half-duplex downlink subframe, and the half-duplex downlink When the frequency band and the at least one resource in the downlink pilot time slot of the S subframe are, the second terminal receives the downlink pilot time slot of the base station in the half duplex downlink subframe, the half duplex downlink frequency band, and the S subframe The third signal transmitted on at least one of the resources, so that the base station acquires a specific process of the self-interfering channel parameter. Optionally, the half-duplex downlink time-frequency resource is a half-duplex downlink subframe, and the half-double At least one of the downlink pilot slots and the downlink pilot slots of the s subframe may be referred to as training time τ. Optionally, the foregoing half-duplex downlink subframe includes a fixed downlink subframe, where the fixed downlink subframe includes a subframe 0 and/or a subframe 5.

 Specifically, the second terminal receives the third signal sent by the base station on at least one of a half-duplex downlink subframe, a half-duplex downlink frequency band, and a downlink pilot time slot of the S subframe, and the base station is at the same time. Receiving a first received signal on at least one of a half-duplex downlink subframe, a half-duplex downlink frequency band, and a downlink pilot time slot of the S-subframe; the base station according to the formula 1 in the foregoing embodiment: y ^ ht ^ st. + n, , Get the self-interference channel parameters.

 The third signal A is sent by the base station to any terminal in the wireless communication system on at least one of a half-duplex downlink subframe, a half-duplex downlink frequency band, and a downlink pilot time slot of the S subframe. Therefore, the third signal is known to the base station; and in at least one of the half-duplex downlink subframe, the half-duplex downlink frequency band, and the downlink pilot time slot of the s subframe, in the wireless communication system None of the terminals sent a signal to the base station. a first received signal obtained by the base station on at least one of a half-duplex downlink subframe and/or a half-duplex downlink frequency band and a downlink pilot time slot of the s subframe, for the base station, It is also known. Therefore, the base station can estimate the self-interference channel parameters according to Equation 1 (the actual value should be ).

 Moreover, when both the first received signal and the third signal are oversampled signals, the oversampling multiples are the same, and the accuracy can be improved.

In the interference cancellation method of the wireless communication system provided by the embodiment of the present invention, the second terminal sends the received signal strength of the first uplink reference signal to the base station by using the second half-duplex uplink time-frequency resource, so that the base station according to the first uplink reference The received signal strength of the signal is configured to allocate the full-duplex time-frequency resources to the first terminal and the second terminal in the first terminal pair, so that the two terminals respectively work in different half-duplex states, ensuring that the base station is in full double In the working state, self-interference cancellation is performed. According to the method provided by the embodiment of the present invention, the base station allocates the full-duplex time-frequency resource to the first terminal and the second terminal in the first terminal pair according to the received signal strength of the first uplink reference signal, and reduces the first terminal. Interference to the second terminal when transmitting the first signal to the base station; at the same time, the base station performs self-interference channel estimation on the half-duplex downlink time-frequency resource, and performs self-interference cancellation when the base station is in the full-duplex state, so that The communication capacity of the system is improved. On the basis of the foregoing embodiments, as another possible implementation manner of the embodiment of the present invention, In this embodiment, when the half-duplex downlink time-frequency resource is the prefix time of the OFDM symbol in the fourth type of subframe, the second terminal sends the base station to send the prefix time of the OFDM symbol in the fourth-type subframe. The prefix of the CP-OFDM signal enables the base station to acquire the specific process of the self-interfering channel parameters.

Specifically, the first terminal sends a prefix of the ZP-OFDM signal to the base station in a prefix time of the OFDM symbol in the fourth type of subframe, and the base station sends the prefix of the OFDM symbol in the fourth type of subframe. The at least one second terminal transmits a prefix of the CP-OFDM signal. In the current wireless communication system, in order to avoid inter-OFDM interference ISI caused by multipath channels, a prefix time is added before each OFDM symbol, and the prefix time is usually designed to be larger than the first path of the system through the transmission channel of the wireless channel. The delay difference between the maximum delay path and the receiving end is large. For different design considerations, the CP-OFDM cyclic prefix OFDM signal can be transmitted within the prefix time, that is, the last N _cp sample points of the OFDM symbol are copied into the prefix for transmission, and the entire OFDM symbol is a CP-OFDM signal, and another is Nothing is transmitted during the prefix time, that is, the zero-prefix ODFM signal is sent within the prefix time, and the entire OFDM symbol is the ZP-OFDM signal (ie, ZP-OFDM is zero during this prefix time, outside this prefix time, ZP - OFDM is not zero). In addition, the CP-OFDM signal and the second received signal are both oversampled signals, so that the accuracy can be improved.

 Therefore, the base station sends a prefix of the CP-OFDM signal to the at least one second terminal of the second terminal group (for example, the terminal C in FIG. 2) in the prefix time of the OFDM symbol in the fourth type of subframe, the CP. - the prefix of the OFDM signal is the following formula 1: y^ /^A + ; and scheduling at least one first terminal (terminal A and/or terminal B in the figure) in the first terminal group at the fourth The prefix of the ZP-OFDM signal is transmitted to the base station within the prefix time of the OFDM symbol in the class-like subframe, which is actually equivalent to the first terminal not transmitting a signal to the base station.

 Therefore, the base station may obtain the self-interference channel parameter according to the second received signal and the foregoing formula 1 in the prefix time of the OFDM symbol in the fourth type of subframe, where ^ is the self-interference channel estimation of the base station. Noise; is the self-interference channel parameter; A is the above

The prefix of the CP-OFDM signal. On the basis of the foregoing embodiment, as a third possible implementation manner of the embodiment of the present invention, the method in this embodiment is to separately transmit and receive a pilot signal by using a quadrature full-duplex time-frequency resource by a base station, Reduce residual self-interference (residual transmitter signal) The impact of the wireless receive channel / ^ estimation. The method may include: the second terminal receiving the first pilot signal sent by the base station on the first full-duplex time-frequency resource; wherein the first full-duplex time-frequency resource and the at least one The second full-duplex time-frequency resource used by the first terminal to send the second pilot signal to the base station is an orthogonal time-frequency resource.

Specifically, the signal w sent by the base station to the second terminal may include the first pilot signal in addition to the data, and the signal sent by the first terminal received by the base station includes data (the base station needs to demodulate the data). Also includes a second pilot signal. Therefore, after the self-interference cancellation is performed by the base station (assuming self-interference is completely eliminated), according to Equation 2, the signal after the self-interference cancellation by the base station is y - hr * sr ₊ n ₂ (Equation 8), and the base station extracts the second from w The pilot signal is estimated by using the second pilot signal, and then the base station can correctly demodulate the data in w according to the second pilot signal and the ^.

However, when the self-interference channel parameter is estimated to have a certain error with the original self-interference channel of the base station, the *w ₂ in Equation ₂ cannot be completely cancelled, and a part of the self-interference (RI) is left. , Equation 8 above should actually be the formula 9: y = hr * sr + (ht - ϋή * st ₂ + n = hr * sr + RI + n ₂ .) Time-frequency resources remaining in the second pilot signal The upper RI will cause a large error to the receiving end to the radio receiving channel/^ estimation, thereby affecting the correct demodulation of the data in the base station pair.

Therefore, in order to reduce the RL remaining on the second full-duplex time-frequency resource, the power on the second full-duplex time-frequency resource can be reduced. Since the data includes not only the data signal sent by the base station to the second terminal but also the first pilot signal sent by the base station to the second terminal, the power of the data signal is generally smaller than the power of the pilot signal, and therefore, only the first terminal sends On the second full-duplex time-frequency resource of the second pilot signal, the base station sends the data signal of the second terminal to the second terminal on the second full-duplex time-frequency resource, so that the second full-duplex can be reduced. The power on the frequency resources, thereby reducing the residual interference RI. Therefore, the embodiment provides the following technical solutions: In the embodiment of the present invention, the base station uses the first full-duplex time-frequency resource to transmit the first pilot signal, and the second full-duplex time-frequency resource to receive at least one The second pilot signal sent by the first terminal, and the first full-duplex time-frequency resource and the second full-duplex time-frequency resource may be orthogonal time-frequency resources in the form of time division, frequency division or code division. The method of time division or frequency division makes the corresponding data on the second full-duplex time-frequency resource be the data signal sent by the base station to the second terminal. Generally, the power of the data signal is smaller than the pilot signal, so residual interference can be reduced. When the first full duplex time-frequency resource and the second full duplex time-frequency resource are When the code is orthogonal to the time-frequency resource, the pilot signal of the received signal of the base station (the second pilot signal) and the pilot signal of the transmitted signal of the base station (the first pilot signal) share the same full-duplex time-frequency. The resource, the first pilot signal and the second pilot signal are spread using an orthogonal code, and the residual interference can be cancelled by despreading.

 According to the method provided by the embodiment of the present invention, the first terminal sends a second pilot signal to the base station by using a second full-duplex time-frequency resource, and the second terminal adopts a second orthogonal to the second full-duplex time-frequency resource. A full-duplex time-frequency resource transmits the first pilot signal, which reduces the residual signal (residual data signal or residual pilot signal) of the base station to the base station to correctly demodulate the data in the received signal. interference. On the basis of the foregoing embodiment, as a fourth possible implementation manner of the embodiment of the present invention, the method in this embodiment is that the second terminal receives the second base station to send the fourth full-duplex time-frequency resource. a four-pilot signal, and the base station controls a specific process in which the first terminal remains silent on the fourth full-duplex time-frequency resource to avoid the influence of self-interference on the pilot signal.

 Specifically, the base station uses the fourth full-duplex time-frequency resource to transmit the fourth pilot signal to the at least one second terminal, where the base station controls the at least one first terminal to remain on the fourth full-duplex time-frequency resource. Silent. That is, the at least one first terminal does not send a signal to the base station on the fourth full-duplex time-frequency resource, and reduces the influence of the transmission signal of the at least one first terminal on the self-interference channel estimation of the base station.

 According to the method provided by the embodiment of the present invention, the second terminal receives the fourth pilot signal that is sent by the base station on the fourth full-duplex time-frequency resource, and the base station controls the first terminal not to the base station on the fourth full-duplex time-frequency resource. The signal is transmitted, thereby avoiding the influence of the transmission signal of at least one first terminal on the self-interference channel estimation of the base station.

 A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be implemented by hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, when executed, The foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

FIG. 11 is a schematic structural diagram of Embodiment 1 of a base station according to an embodiment of the present disclosure. As shown in FIG. 11, the base station includes: a receiving module 10, a processing module 11, and a sending module 12. The receiving module 10 is configured to receive, by the at least one second terminal, a received signal strength of the first uplink reference signal that is reported by the second half-duplex uplink time-frequency resource, where the received signal strength of the first uplink reference signal is The at least one second terminal is obtained by measuring the first uplink reference signal sent by the at least one first terminal on the first half-duplex uplink time-frequency resource; and is further configured to receive the first terminal pair determined by the processing module 11 The first terminal sends the first signal by using the configured full-duplex time-frequency resource;

 The processing module 11 is configured to perform self-interference channel estimation on the half-duplex downlink time-frequency resource, and obtain a self-interference channel parameter; and according to the received signal strength of the first uplink reference signal, from the at least the first terminal and Determining the first terminal pair in the at least one second terminal; wherein the first terminal pair includes a first terminal and a second terminal, and between the first terminal and the second terminal in the first terminal pair The interference is less than the preset threshold; and is configured to allocate the full-duplex time-frequency resources to the first terminal and the second terminal in the first terminal pair according to the received signal strength of the first uplink reference signal; The second signal is sent to the second terminal in the first terminal pair by using the full duplex time-frequency resource configured by the processing module 11;

 The processing module 11 is further configured to obtain, according to the self-interference channel parameter and the second signal, the self-interference cancellation signal on the full-duplex time-frequency resource to perform self-interference cancellation.

 The base station provided by the embodiment of the present invention may perform the foregoing method embodiments, and the implementation principle and technical effects are similar, and details are not described herein again.

 Further, the sending module 12 is further configured to notify the at least one second terminal to measure time-frequency resources, where the measured time-frequency resource includes the first half-duplex uplink time-frequency resource; Transmitting, by the at least one second terminal, a signal parameter of the first uplink reference signal; the received signal strength of the first uplink reference signal is that the at least one second terminal is on the measured time-frequency resource, according to the A signal parameter measurement of an uplink reference signal is obtained.

 It should be noted that the foregoing half-duplex downlink time-frequency resources include a half-duplex downlink subframe, a downlink pilot slot of an S-subframe, a half-duplex downlink frequency band, and a prefix time of an OFDM symbol in a fourth-type subframe. At least one of them. Further, the half-duplex downlink subframe includes a fixed downlink subframe, and the fixed downlink subframe includes a subframe 0 and/or a subframe 5.

Optionally, when the half-duplex downlink time-frequency resource is at least one of a half-duplex downlink subframe, the half-duplex downlink frequency band, and a downlink pilot time slot of the S subframe, the sending module 12, further used for downlink guiding in the half-duplex downlink subframe, the half-duplex downlink frequency band, and the S subframe Sending a third signal to any terminal in the wireless communication system on at least one of the frequency slots; the receiving module 10 is further configured to: in the half duplex downlink subframe, the half duplex The first receiving signal is received on at least one of the downlink frequency band and the downlink pilot time slot of the s subframe; the processing module 11 is specifically configured to acquire the self-interference channel parameter according to the =+; The first received signal is the noise when the base station performs self-interference channel estimation; the / ^ is the self-interference channel parameter; the is the third signal. And further, the first received signal and the third signal are oversampled signals.

 The base station provided by the embodiment of the present invention may perform the foregoing method embodiments, and the implementation principle and technical effects are similar, and details are not described herein again.

 Optionally, if the half-duplex downlink time-frequency resource is the prefix time of the OFDM symbol in the fourth type of subframe, the sending module 12 is further configured to: in the fourth type of subframe, the OFDM symbol Transmitting, to the at least one second terminal, a prefix of a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) signal; the processing module 11 is further configured to schedule the at least one first terminal in the fourth Sending a prefix of the ZP-OFDM signal to the base station in a prefix time of the OFDM symbol in the sub-frame; the receiving module 10 is further configured to receive the prefix time of the OFDM symbol in the fourth type of subframe Describe the second received signal;

 The processing module 11 is specifically configured to obtain a self-interference channel parameter according to 3^=^*4+^, where the 3^ is the second received signal, and the self-interference channel is performed by the base station. The noise at the time of estimation; the / ^ is the self-interference channel parameter; the 4 is a prefix of the CP-OFDM signal. And, further, the second received signal and the CP-OFDM signal are oversampled signals.

 The base station provided by the embodiment of the present invention may perform the foregoing method embodiments, and the implementation principle and technical effects are similar, and details are not described herein again.

 Further, the sending module 12 is further configured to: use the first full-duplex time-frequency resource to transmit the first pilot signal to the at least one second terminal; and the receiving module 10 is further configured to adopt the second full-duplex The time-frequency resource receives the second pilot signal sent by the at least one first terminal, where the first full-duplex time-frequency resource and the second full-duplex time-frequency resource are orthogonal time-frequency resources.

Further, the receiving module 10 is further configured to receive, by using a third full-duplex time-frequency resource, a third pilot signal that is sent by the at least one first terminal, where the sending module 12 is in the third full double Keep quiet on the time and frequency resources. Further, the sending module 12 is further configured to: transmit, by using the fourth full-duplex time-frequency resource, a fourth pilot signal to the at least one second terminal, where the processing module 11 controls the at least one first The terminal remains silent on the fourth full-duplex time-frequency resource.

 The base station provided by the embodiment of the present invention may perform the foregoing method embodiments, and the implementation principle and technical effects are similar, and details are not described herein again. The present invention provides a first embodiment of a first terminal. The first terminal includes: a sending module 20, configured to send a first uplink reference signal on the first half-duplex uplink time-frequency resource, so that the at least one second terminal measures the received signal strength of the first uplink reference signal, And transmitting the received signal strength of the first uplink reference signal to the base station by using the second half-duplex uplink time-frequency resource; and sending the first signal to the base station by using the full-duplex time-frequency resource; the full-duplex time The frequency resource is configured by the base station according to the received signal strength of the first uplink reference signal to the first terminal and the second terminal in the first terminal pair, where the first terminal pair includes the first terminal and the second terminal The interference between the first terminal and the second terminal in the first terminal pair is less than a preset threshold.

 The first terminal provided by the embodiment of the present invention may perform the foregoing method embodiments, and the implementation principles and technical effects thereof are similar, and details are not described herein again.

 The present invention provides a second embodiment of the first terminal, as shown in FIG. On the basis of the first terminal embodiment, the first terminal further includes: a receiving module 21, configured to receive, by the base station, a downlink pilot in a half-duplex downlink subframe, a half-duplex downlink frequency band, and an S subframe. a third signal transmitted on at least one resource in the time slot.

 Further, the half-duplex downlink subframe includes a fixed downlink subframe, and the fixed downlink subframe includes a subframe 0 and/or a subframe 5.

 Further, the third signal is an oversampled signal.

 Further, the sending module 20 is further configured to send a prefix of the zero-prefix Orthogonal Frequency Division Multiplexing ZP-0FDM signal to the base station within a prefix time of the OFDM symbol in the fourth type of subframe.

 The first terminal provided by the embodiment of the present invention may perform the foregoing method embodiments, and the implementation principles and technical effects thereof are similar, and details are not described herein again.

Further, the sending module 20 is further configured to send, by using a second full-duplex time-frequency resource, a second pilot signal to the base station, where the second full-duplex time-frequency resource and the base station The first full-duplex time-frequency resource used by the at least one second terminal to transmit the first pilot signal is an orthogonal time-frequency Further, the receiving module 21 is further configured to receive a third pilot signal that is sent by the base station by using a third full-duplex time-frequency resource; where, in the third full-duplex time-frequency resource, The base station remains silent.

 The first terminal provided by the embodiment of the present invention may perform the foregoing method embodiments, and the implementation principles and technical effects thereof are similar, and details are not described herein again. FIG. 13 is a schematic structural diagram of Embodiment 1 of a second terminal provided by the present invention. As shown in FIG. 13, the second terminal includes: a sending module 30, configured to send, by using a second half-duplex uplink time-frequency resource, a received signal strength of the first uplink reference signal to the base station, so that the base station is configured according to the a received signal strength of the uplink reference signal, the full-duplex time-frequency resource is respectively configured to the first terminal and the second terminal in the first terminal pair; the received signal strength of the first uplink reference signal is the second terminal Obtaining, by the first uplink reference signal that is sent by the first terminal on the first half-duplex uplink time-frequency resource; the first terminal pair is receiving, by the base station, the first uplink reference signal The signal strength is determined from the at least the first terminal and the at least one second terminal; wherein the first terminal pair includes the first terminal and the second terminal, and the first terminal and the second terminal in the first terminal pair The interference between the terminals is less than a preset threshold. The receiving module 31 is configured to receive a second signal that is sent by the base station by using the full-duplex time-frequency resource.

 The second terminal provided by the embodiment of the present invention may perform the foregoing method embodiments, and the implementation principles and technical effects thereof are similar, and details are not described herein again.

 Further, the receiving module 31 is further configured to receive, by the base station, at least one resource in a half-duplex downlink subframe, a half-duplex downlink frequency band, and a downlink pilot time slot of an S subframe. The third signal.

 Further, the half-duplex downlink subframe includes a fixed downlink subframe, and the fixed downlink subframe includes a subframe 0 and/or a subframe 5.

 Further, the third signal is an oversampled signal.

 The second terminal provided by the embodiment of the present invention may perform the foregoing method embodiments, and the implementation principles and technical effects thereof are similar, and details are not described herein again.

Further, the receiving module 31 is further configured to receive, before the cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) signal sent by the base station in a prefix time of an OFDM symbol in the fourth type of subframe. Embellished.

 Further, the CP-0FDM signal is an oversampled signal.

 The second terminal provided by the embodiment of the present invention may perform the foregoing method embodiments, and the implementation principles and technical effects thereof are similar, and details are not described herein again.

 Further, the receiving module 31 is further configured to receive a first pilot signal that is sent by the base station on a first full-duplex time-frequency resource, where the first full-duplex time-frequency resource is The second full-duplex time-frequency resource used by the at least one first terminal to send the second pilot signal to the base station is an orthogonal time-frequency resource.

 Further, the receiving module 31 is further configured to receive a fourth pilot signal that is sent by the base station on a fourth full-duplex time-frequency resource, where, on the fourth full-duplex time-frequency resource, The base station remains silent.

 The second terminal provided by the embodiment of the present invention may perform the foregoing method embodiments, and the implementation principles and technical effects thereof are similar, and details are not described herein again.

 FIG. 14 is a schematic structural diagram of Embodiment 2 of a base station according to the present invention. As shown in FIG. 14, the base station includes: a receiver 20, a processor 21, and a transmitter 22.

 The receiver 20 is configured to receive, by the at least one second terminal, a received signal strength of the first uplink reference signal that is reported by the second half duplex uplink time-frequency resource, where the received signal strength of the first uplink reference signal is The at least one second terminal is obtained by measuring the first uplink reference signal sent by the at least one first terminal on the first half-duplex uplink time-frequency resource; and is further configured to receive the first terminal pair determined by the processor 21 The first terminal in the first terminal, using the configured full-duplex time-frequency resource to send the first signal;

 The processor 21 is configured to determine, according to the received signal strength of the first uplink reference signal, a first terminal pair from the at least a first terminal and the at least one second terminal, where the first terminal pair The first terminal and the second terminal are included, and the interference between the first terminal and the second terminal in the first terminal pair is less than a preset threshold; and the full duplex is performed according to the received signal strength of the first uplink reference signal. The time-frequency resources are respectively configured to the first terminal and the second terminal in the first terminal pair;

 The transmitter 22 is configured to send, by using the full-duplex time-frequency resource configured by the processor 21, a second signal to the second terminal in the first terminal pair;

The processor 21 is further configured to obtain, according to the self-interference channel parameter and the second signal, the self-interference cancellation signal on the full-duplex time-frequency resource to perform self-interference cancellation. The base station provided by the embodiment of the present invention may perform the foregoing method embodiments, and the implementation principles and technical effects thereof are similar, and details are not described herein again.

 Referring to the signal flow diagram of the base station processing shown in FIG. 15 or FIG. 16, the processor 21 may be further configured to insert pilot and modulation and encoded data into a predefined location (also referred to as resource mapping). After performing OFDM modulation, after prefixing, performing serial-to-parallel conversion; usually, the upsampled data is digital-analog (D/A) and then transformed into an analog domain by the processor 21, and then transmitted through the RF link. After processing, it is transmitted through the transmitter 22 (i.e., the transmitting antenna of the base station). For the receiving link, after receiving the signal by the receiver 20, the base station performs radio frequency processing on the received signal through the processor 21, performs analog-to-digital (A/D) processing, transforms to the digital domain, and then processes The device 21 downsamples the signal of the digital domain, and changes the string, de-prefix, OFDM demodulation, and takes the pilot, the estimated channel, and the like, and performs data demodulation according to the channel.

 Further, the transmitter 22 is further configured to notify the at least one second terminal to measure time-frequency resources, where the measured time-frequency resource includes the first half-duplex uplink time-frequency resource; The at least one second terminal sends the signal parameter of the first uplink reference signal; the received signal strength of the first uplink reference signal is that the at least one second terminal is on the measured time-frequency resource, according to the first The signal parameter measurement of the uplink reference signal is obtained.

 It should be noted that the foregoing half-duplex downlink time-frequency resources include a half-duplex downlink subframe, a downlink pilot slot of an S-subframe, a half-duplex downlink frequency band, and a prefix time of an OFDM symbol in a fourth-type subframe. At least one of them. The half-duplex downlink subframe includes a fixed downlink subframe, and the fixed downlink subframe includes a subframe 0 and/or a subframe 5.

 Optionally, if the half-duplex downlink time-frequency resource is at least one of a half-duplex downlink subframe, the half-duplex downlink frequency band, and a downlink pilot time slot of an S subframe, the transmitter 22. The method is further configured to: in the at least one resource of the half-duplex downlink subframe, the half-duplex downlink frequency band, and the downlink subframe frequency slot of the S subframe, to the wireless communication system Any terminal sends a third signal; the receiver 20 is further configured to: at least one of the half-duplex downlink subframe, the half-duplex downlink frequency band, and the downlink pilot time slot of the S subframe The first receiving signal is received by the processor, where the processor 21 is configured to obtain a self-interfering channel parameter according to the ^; wherein, the first receiving signal is Noise when interfering with channel estimation; said / ^ is said self-interference channel parameter; said said third signal.

Further, the first received signal and the third signal are oversampled signals. The base station provided by the embodiment of the present invention may perform the foregoing method embodiments, and the implementation principles and technical effects thereof are similar, and details are not described herein again.

 Optionally, if the half-duplex downlink time-frequency resource is the prefix time of the OFDM symbol in the fourth type of subframe, the transmitter 22 is further configured to: in the fourth type of subframe, the OFDM symbol Sending, to the at least one second terminal, a prefix of a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) signal to the at least one second terminal; the processor 21, further configured to schedule the at least one first terminal in the fourth Sending a prefix of the ZP-OFDM signal to the base station in a prefix time of the OFDM symbol in the sub-frame; the receiver 20 is further configured to receive the prefix time of the OFDM symbol in the fourth type of subframe Describe the second received signal;

 The processor 21 is specifically configured to obtain a self-interference channel parameter according to y^^A+, where the 3^ is the second received signal, where the self-interference channel is estimated by the base station. Noise; the / ^ is the self-interference channel parameter; the 4 is a prefix of the CP-OFDM signal.

 Further, the second received signal and the CP-OFDM signal are oversampled signals.

 The base station provided by the embodiment of the present invention may perform the foregoing method embodiments, and the implementation principle and technical effects are similar, and details are not described herein again.

 Further, the transmitter 22 is further configured to: use the first full-duplex time-frequency resource to transmit the first pilot signal to the at least one second terminal; and the receiver 20 is further configured to adopt the second full Receiving, by the duplex time-frequency resource, the second pilot signal sent by the at least one first terminal, where the first full-duplex time-frequency resource and the second full-duplex time-frequency resource are orthogonal time-frequency resources .

 Further, the receiver 20 is further configured to receive, by using a third full-duplex time-frequency resource, a third pilot signal that is sent by the at least one first terminal, where the transmitter 22 is in the third Keep silent on full-duplex time-frequency resources.

 Further, the transmitter 22 is further configured to: transmit, by using the fourth full-duplex time-frequency resource, a fourth pilot signal to the at least one second terminal; where the processor 21 controls the at least one A terminal remains silent on the fourth full duplex time-frequency resource.

The base station provided by the embodiment of the present invention may perform the foregoing method embodiments, and the implementation principles and technical effects thereof are similar, and details are not described herein again. The present invention provides a third embodiment of the first terminal. The first terminal includes a transmitter 40 for Transmitting a first uplink reference signal on the half-duplex uplink time-frequency resource, so that the at least one second terminal measures the received signal strength of the first uplink reference signal, and passes the received signal strength of the first uplink reference signal The second-half duplex uplink time-frequency resource is reported to the base station; and is configured to send the first signal to the base station by using the full-duplex time-frequency resource; the full-duplex time-frequency resource is the base station according to the first uplink reference signal The received signal strength is configured to the first terminal and the second terminal in the first terminal pair, where the first terminal pair includes the first terminal and the second terminal, and the first terminal and the first terminal in the first terminal pair The interference between the two terminals is less than the preset threshold.

 The first terminal provided by the embodiment of the present invention may perform the foregoing method embodiments, and the implementation principles and technical effects thereof are similar, and details are not described herein again.

 FIG. 17 is a schematic structural diagram of Embodiment 4 of a first terminal provided by the present invention. On the basis of the foregoing third terminal embodiment, the first terminal further includes: a receiver 41, configured to receive, by the base station, a downlink pilot in a half-duplex downlink subframe, a half-duplex downlink frequency band, and an S subframe. a third signal transmitted on at least one resource in the time slot.

 Further, the half-duplex downlink subframe includes a fixed downlink subframe, and the fixed downlink subframe includes a subframe 0 and/or a subframe 5.

 Further, the third signal is an oversampled signal.

 Further, the transmitter 40 is further configured to send a prefix of the zero-prefix Orthogonal Frequency Division Multiplexing ZP-0FDM signal to the base station within a prefix time of the OFDM symbol in the fourth type of subframe.

 The first terminal provided by the embodiment of the present invention may perform the foregoing method embodiments, and the implementation principles and technical effects thereof are similar, and details are not described herein again.

 Further, the transmitter 40 is further configured to send, by using a second full-duplex time-frequency resource, a second pilot signal to the base station, where the second full-duplex time-frequency resource and the base station are The first full-duplex time-frequency resource used by the at least one second terminal to send the first pilot signal is an orthogonal time-frequency resource.

 Further, the receiver 41 is further configured to receive a third pilot signal that is sent by the base station by using a third full-duplex time-frequency resource; where, in the third full-duplex time-frequency resource, The base station remains silent.

The first terminal provided by the embodiment of the present invention may perform the foregoing method embodiments, and the implementation principles and technical effects thereof are similar, and details are not described herein again. FIG. 18 is a schematic structural diagram of Embodiment 2 of a second terminal according to the present invention. As shown in FIG. 18, the second terminal includes: a transmitter 50, configured to send, by using a second half-duplex uplink time-frequency resource, a received signal strength of the first uplink reference signal to the base station, so that the base station is configured according to the a received signal strength of the uplink reference signal, the full-duplex time-frequency resource is respectively configured to the first terminal and the second terminal in the first terminal pair; the received signal strength of the first uplink reference signal is the second terminal Obtaining, by the first uplink reference signal that is sent by the first terminal on the first half-duplex uplink time-frequency resource; the first terminal pair is receiving, by the base station, the first uplink reference signal The signal strength is determined from the at least the first terminal and the at least one second terminal; wherein the first terminal pair includes the first terminal and the second terminal, and the first terminal and the second terminal in the first terminal pair The interference between the terminals is less than a preset threshold. The receiver 51 is configured to receive a second signal that is sent by the base station by using the full-duplex time-frequency resource.

 The second terminal provided by the embodiment of the present invention may perform the foregoing method embodiments, and the implementation principles and technical effects thereof are similar, and details are not described herein again.

 Further, the receiver 51 is further configured to receive, by the base station, at least one resource in a half-duplex downlink subframe, a half-duplex downlink frequency band, and a downlink pilot time slot of an S subframe. The third signal.

 Further, the half-duplex downlink subframe includes a fixed downlink subframe, and the fixed downlink subframe includes a subframe 0 and/or a subframe 5.

 Further, the third signal is an oversampled signal.

 The second terminal provided by the embodiment of the present invention may perform the foregoing method embodiments, and the implementation principles and technical effects thereof are similar, and details are not described herein again.

 Further, the receiver 51 is further configured to receive a prefix of a cyclic prefix orthogonal frequency division multiplexing CP-OFDM signal sent by the base station in a prefix time of an OFDM symbol in the fourth type of subframe.

 Further, the CP-OFDM signal is an oversampled signal.

 The second terminal provided by the embodiment of the present invention may perform the foregoing method embodiments, and the implementation principles and technical effects thereof are similar, and details are not described herein again.

Further, the receiver 51 is further configured to receive a first pilot signal that is sent by the base station on a first full-duplex time-frequency resource, where the first full-duplex time-frequency resource is And the second full-duplex time-frequency resource used by the at least one first terminal to send the second pilot signal to the base station is orthogonal Frequency resources.

 Further, the receiver 51 is further configured to receive a fourth pilot signal that is sent by the base station on a fourth full-duplex time-frequency resource, where, on the fourth full-duplex time-frequency resource, The base station remains silent.

 The second terminal provided by the embodiment of the present invention may perform the foregoing method embodiments, and the implementation principles and technical effects thereof are similar, and details are not described herein again.

 Finally, it should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting thereof; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims

Claim A method for canceling interference in a wireless communication system, comprising:  The base station performs self-interference channel estimation on the half-duplex downlink time-frequency resources, and acquires self-interference channel parameters;  Receiving, by the base station, a received signal strength of the first uplink reference signal that is reported by the second terminal by the second half-duplex uplink time-frequency resource; the received signal strength of the first uplink reference signal is the at least one second terminal Obtaining, by measuring, by the first uplink reference signal that is sent by the at least one first terminal on the first half-duplex uplink time-frequency resource;  Determining, by the base station, the first terminal pair from the at least the first terminal and the at least one second terminal according to the received signal strength of the first uplink reference signal; wherein the first terminal pair includes the first terminal and The second terminal, the interference between the first terminal and the second terminal in the first terminal pair is less than a preset threshold;  The base station configures the full-duplex time-frequency resources to the first terminal and the second terminal in the first terminal pair according to the received signal strength of the first uplink reference signal;  Receiving, by the base station, the first signal sent by the first terminal in the first terminal pair by using the full-duplex time-frequency resource, and using the full-duplex time-frequency resource to the first terminal The second terminal sends the second signal;  And the base station acquires a self-interference cancellation signal according to the self-interference channel parameter and the second signal on the full-duplex time-frequency resource to perform self-interference cancellation.  2. The method of claim 1 further comprising:  The base station notifies the at least one second terminal to measure time-frequency resources, where the measured time-frequency resource includes the first half-duplex uplink time-frequency resource;  The base station sends the signal parameter of the first uplink reference signal to the at least one second terminal; the received signal strength of the first uplink reference signal is that the at least one second terminal is on the measured time-frequency resource Obtaining according to the signal parameter measurement of the first uplink reference signal.  The method according to claim 1 or 2, wherein the half-duplex downlink time-frequency resource comprises a half-duplex downlink subframe, a downlink pilot slot of an S-subframe, and a half-duplex downlink At least one of a frequency band and a prefix time of an OFDM symbol in a fourth type of subframe. The method according to claim 3, wherein the half-duplex downlink subframe comprises a fixed downlink subframe, and the fixed downlink subframe comprises a subframe 0 and/or a subframe 5. The method according to claim 3 or 4, wherein if the half-duplex downlink time-frequency resource is a half-duplex downlink subframe, the half-duplex downlink frequency band, and a downlink of the S subframe At least one of the pilot time slots, the base station performs self-interference channel estimation on the half-duplex downlink time-frequency resource, and obtains self-interference channel parameters, including:  And performing, by the base station, at least one of the half-duplex downlink subframe, the half-duplex downlink frequency band, and the downlink pilot time slot of the S subframe to the wireless communication system a terminal sends a third signal;  The base station receives the first received signal on the at least one resource in the half-duplex downlink subframe, the half-duplex downlink frequency band, and the downlink pilot time slot of the S subframe;  The base station acquires a self-interference channel parameter according to the y^^A+, where the ^ is the first received signal; the noise is when the base station performs self-interference channel estimation; The self-interference channel parameter; the third signal.  6. The method of claim 5 wherein said first received signal and said third signal are oversampled signals.  The method according to claim 3, wherein, if the half-duplex downlink time-frequency resource is a prefix time of an OFDM symbol in the fourth type of subframe, the base station is in a half-duplex downlink The self-interference channel estimation is performed on the frequency resource, and the self-interference channel parameters are obtained, including:  Transmitting, by the base station, a prefix of a cyclic prefix orthogonal frequency division multiplexing CP-OFDM signal to the at least one second terminal within a prefix time of the OFDM symbol in the fourth type of subframe;  And the base station schedules, by the at least one first terminal, a prefix of a zero-prefix Orthogonal Frequency Division Multiplexing ZP-OFDM signal to be sent to the base station within a prefix time of the OFDM symbol in the fourth type of subframe;  The base station receives the second received signal within a prefix time of an OFDM symbol in the fourth type of subframe;  The base station obtains a self-interference channel parameter according to y^^A + ^, where the ^ is the second received signal; the noise is used when the base station performs self-interference channel estimation; The self-interference channel parameter; the prefix of the CP-OFDM signal.  8. The method according to claim 7, wherein the second received signal and the CP-OFDM signal are oversampled signals. The method of any of claims 1-8, wherein the method further comprises: The base station transmits the first pilot signal to the at least one second terminal by using the first full-duplex time-frequency resource, and receives the second pilot sent by the at least one first terminal by using the second full-duplex time-frequency resource The first full duplex time-frequency resource and the second full-duplex time-frequency resource are orthogonal time-frequency resources.  The method according to any one of claims 1-8, wherein the method further comprises:  The base station receives the third pilot signal sent by the at least one first terminal by using the third full-duplex time-frequency resource; wherein the base station remains silent on the third full-duplex time-frequency resource.  The method according to claim 10, wherein the method further comprises: transmitting, by the base station, a fourth pilot signal to the at least one second terminal by using a fourth full-duplex time-frequency resource; The base station controls the at least one first terminal to remain silent on the fourth full duplex time-frequency resource.  12. A method for canceling interference in a wireless communication system, comprising:  The first terminal sends the first uplink reference signal on the first half-duplex uplink time-frequency resource, so that the at least one second terminal measures the received signal strength of the first uplink reference signal, and the first uplink reference signal is used. The received signal strength is reported to the base station by the second half-duplex uplink time-frequency resource; the first terminal sends the first signal to the base station by using the full-duplex time-frequency resource; the full-duplex time-frequency resource is the base station according to the base station The received signal strength of the first uplink reference signal is configured to the first terminal and the second terminal in the first terminal pair, where the first terminal pair includes the first terminal and the second terminal, and the first terminal The interference between the first terminal and the second terminal in the pair is less than a preset threshold.  The method according to claim 12, wherein the method further comprises: receiving, by the first terminal, a downlink guide of a base station in a half-duplex downlink subframe, a half-duplex downlink frequency band, and an S subframe a third signal transmitted on at least one of the frequency slots.  The method according to claim 13, wherein the half-duplex downlink subframe comprises a fixed downlink subframe, and the fixed downlink subframe comprises a subframe 0 and/or a subframe 5.  15. The method of claim 13 wherein the third signal is an oversampled signal. The method according to claim 12, wherein the method further comprises: the first terminal transmitting a zero prefix orthogonal frequency to the base station within a prefix time of an OFDM symbol in a fourth type of subframe The prefix of the multiplexed ZP-OFDM signal. The method according to any one of claims 12-16, wherein the method further comprises:  Transmitting, by the first terminal, a second pilot signal to the base station by using a second full-duplex time-frequency resource, where the second full-duplex time-frequency resource and the base station send the second pilot to the at least one second terminal The first full-duplex time-frequency resource used by the first pilot signal is an orthogonal time-frequency resource.  The method according to any one of claims 12 to 16, wherein the method further comprises:  The first terminal receives a third pilot signal that is sent by the base station by using a third full-duplex time-frequency resource; wherein, on the third full-duplex time-frequency resource, the base station remains silent.  19. An interference cancellation method for a wireless communication system, comprising:  The second terminal sends the received signal strength of the first uplink reference signal to the base station by using the second half-duplex uplink time-frequency resource, so that the base station selects the full-duplex time-frequency according to the received signal strength of the first uplink reference signal. The resources are respectively configured to the first terminal and the second terminal in the first terminal pair; the received signal strength of the first uplink reference signal is when the second terminal measures the at least one first terminal in the first half duplex uplink Acquiring the first uplink reference signal that is sent on the frequency resource; the first terminal pair is the received signal strength of the base station according to the first uplink reference signal from the at least first terminal and the at least one second terminal The first terminal pair includes the first terminal and the second terminal, and the interference between the first terminal and the second terminal in the first terminal pair is less than a preset threshold;  The second terminal in the first terminal pair receives the second signal sent by the base station by using the full duplex time-frequency resource.  The method according to claim 19, wherein the method further comprises: the second terminal receiving the downlink of the base station in a half-duplex downlink subframe, a half-duplex downlink frequency band, and an S subframe A third signal transmitted on at least one of the primary pilot time slots.  The method according to claim 20, wherein the half-duplex downlink subframe comprises a fixed downlink subframe, and the fixed downlink subframe comprises a subframe 0 and/or a subframe 5.  22. The method of claim 20 wherein the third signal is an oversampled signal. The method according to claim 19, wherein the method further comprises: receiving, by the second terminal, a prefix time of an OFDM symbol of the base station in the fourth type of subframe The prefix of the cyclic prefix orthogonal frequency division multiplexing CP-OFDM signal transmitted within the cyclic prefix.  24. The method of claim 23, wherein the CP-OFDM signal is an oversampled signal.  The method according to any one of claims 19 to 24, wherein the method further comprises:  The second terminal receives the first pilot signal that is sent by the base station on the first full-duplex time-frequency resource, where the first full-duplex time-frequency resource and the at least one first terminal The second full-duplex time-frequency resource used by the base station to transmit the second pilot signal is an orthogonal time-frequency resource.  The method according to any one of claims 19 to 24, wherein the method further comprises:  The second terminal receives the fourth pilot signal that is sent by the base station on the fourth full-duplex time-frequency resource, where the base station controls the at least one on the fourth full-duplex time-frequency resource The first terminal remains silent.  27. A base station, comprising:  a receiving module, configured to receive, by the at least one second terminal, a received signal strength of the first uplink reference signal that is reported by the second half-duplex uplink time-frequency resource; the received signal strength of the first uplink reference signal is the at least one The second terminal is obtained by measuring the first uplink reference signal sent by the at least one first terminal on the first half-duplex uplink time-frequency resource; and is further configured to receive, by the processing module, the first terminal in the first terminal pair, a first signal sent by using the configured full-duplex time-frequency resource; the processing module, configured to perform self-interference channel estimation on the half-duplex downlink time-frequency resource, obtain a self-interference channel parameter, and according to the first uplink Determining, by the received signal strength of the reference signal, the first terminal pair from the at least a first terminal and the at least one second terminal; wherein the first terminal pair comprises a first terminal and a second terminal, The interference between the first terminal and the second terminal in a terminal pair is less than a preset threshold; and is used to receive a strong signal according to the first uplink reference signal. Configuring a full-duplex time-frequency resource to the first terminal and the second terminal in the first terminal pair, and a sending module, configured to use the full-duplex time-frequency resource configured by the processing module to the first Transmitting a second signal by the second terminal in the terminal pair;  The processing module is further configured to obtain a self-interference cancellation signal according to the self-interference channel parameter and the second signal on the full-duplex time-frequency resource to perform self-interference cancellation. The base station according to claim 27, wherein the sending module is further configured to: Notifying the at least one second terminal to measure the time-frequency resource; wherein the measuring time-frequency resource includes the first half-duplex uplink time-frequency resource; and configured to send the first uplink to the at least one second terminal a signal parameter of the reference signal; the received signal strength of the first uplink reference signal is obtained by the at least one second terminal on the measured time-frequency resource according to the signal parameter measurement of the first uplink reference signal.  The base station according to claim 27 or 28, wherein the half-duplex downlink time-frequency resource comprises a half-duplex downlink subframe, a downlink pilot slot of an S-subframe, and a half-duplex downlink At least one of a frequency band and a prefix time of an OFDM symbol in a fourth type of subframe.  The base station according to claim 29, wherein the half-duplex downlink subframe includes a fixed downlink subframe, and the fixed downlink subframe includes a subframe 0 and/or a subframe 5.  The base station according to claim 29 or 30, wherein if the half-duplex downlink time-frequency resource is a half-duplex downlink subframe, the half-duplex downlink frequency band, and a downlink of the S subframe At least one of the pilot time slots, the sending module is further configured to be used in the half-duplex downlink subframe, the half-duplex downlink frequency band, and the downlink pilot time slot of the S subframe. And transmitting, by the at least one resource, a third signal to any terminal in the wireless communication system; the receiving module is further configured to: in the half-duplex downlink subframe, the half-duplex downlink frequency band, and the S subframe Receiving a first received signal on at least one of the downlink pilot time slots;  The processing module is specifically configured to acquire a self-interference channel parameter according to the ^^; wherein, the ^ is the first received signal; and the noise is used by the base station when performing self-interference channel estimation; Said is said self-interference channel parameter; said said third signal.  The base station according to claim 31, wherein the first received signal and the third signal are oversampled signals.  The base station according to claim 29, wherein, if the half-duplex downlink time-frequency resource is a prefix time of an OFDM symbol in the fourth type of subframe, the sending module is further used in Transmitting a prefix of a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) signal to the at least one second terminal in a prefix time of the OFDM symbol in the fourth type of subframe; the processing module is further configured to schedule the at least a first terminal sends a prefix of the ZP-OFDM signal to the base station in a prefix time of the OFDM symbol in the fourth type of subframe; the receiving module is further configured to perform OFDM in the fourth type of subframe Receiving the second received signal within a prefix time of the symbol; The processing module is specifically configured to obtain a self-interference channel parameter according to ^+; The second received signal is the noise when the base station performs self-interference channel estimation, the self-interference channel parameter, and the prefix of the CP-OFDM signal.  The base station according to claim 33, wherein the second received signal and the CP-OFDM signal are oversampled signals.  The base station according to any one of claims 27 to 34, wherein the sending module is further configured to: use the first full-duplex time-frequency resource to transmit the first pilot to the at least one second terminal. Signal  The receiving module is further configured to receive, by using the second full-duplex time-frequency resource, the second pilot signal that is sent by the at least one first terminal, where the first full-duplex time-frequency resource and the second The full-duplex time-frequency resource is an orthogonal time-frequency resource.  The base station according to any one of claims 27 to 34, wherein the receiving module is further configured to receive, by using a third full-duplex time-frequency resource, a third guide sent by the at least one first terminal. a frequency signal; wherein, the sending module remains silent on the third full-duplex time-frequency resource.  The base station according to claim 36, wherein the sending module is further configured to: transmit, by using a fourth full-duplex time-frequency resource, a fourth pilot signal to the at least one second terminal; The processing module controls the at least one first terminal to remain silent on the fourth full-duplex time-frequency resource.  38. A first terminal, comprising:  a sending module, configured to send a first uplink reference signal on the first half-duplex uplink time-frequency resource, so that the at least one second terminal measures the received signal strength of the first uplink reference signal, and the first uplink is The received signal strength of the reference signal is reported to the base station by using the second half-duplex uplink time-frequency resource; and is further configured to send the first signal to the base station by using the full-duplex time-frequency resource; the full-duplex time-frequency resource is the base station according to the base station The received signal strength of the first uplink reference signal is configured to the first terminal and the second terminal in the first terminal pair, where the first terminal pair includes the first terminal and the second terminal, and the first terminal The interference between the first terminal and the second terminal in the pair is less than a preset threshold.  The first terminal according to claim 38, wherein the first terminal further includes: a receiving module, configured to receive, by the base station, a half-duplex downlink subframe, a half-duplex downlink frequency band, and an S subframe a third signal transmitted on at least one of the downlink pilot time slots. 40. The first terminal according to claim 39, wherein the half duplex downlink The frame includes a fixed downlink subframe, and the fixed downlink subframe includes a subframe 0 and/or a subframe 5. 41. The first terminal according to claim 39, wherein the third signal is an oversampled signal.  The first terminal according to claim 38, wherein the sending module is further configured to send a zero prefix orthogonal frequency division to the base station within a prefix time of the OFDM symbol in the fourth type of subframe. The prefix of the ZP-OFDM signal is multiplexed.  The first terminal according to any one of claims 38-42, wherein the sending module is further configured to send a second pilot signal to the base station by using a second full-duplex time-frequency resource; The first full-duplex time-frequency resource and the first full-duplex time-frequency resource used by the base station to send the first pilot signal to the at least one second terminal are orthogonal time-frequency resources.  The first terminal according to any one of claims 38-42, wherein the receiving module is further configured to receive a third pilot signal that is sent by the base station by using a third full-duplex time-frequency resource. The base station remains silent on the third full-duplex time-frequency resource.  45. A second terminal, comprising:  a sending module, configured to send, by using a second half-duplex uplink time-frequency resource, a received signal strength of the first uplink reference signal to the base station, so that the base station performs full-duplex according to the received signal strength of the first uplink reference signal The time-frequency resources are respectively configured to the first terminal and the second terminal in the first terminal pair; the received signal strength of the first uplink reference signal is that the second terminal is in the first half duplex by measuring at least one first terminal Acquiring the first uplink reference signal sent on the uplink time-frequency resource; the first terminal pair is the received signal strength of the base station according to the first uplink reference signal from the at least first terminal and at least one And determining, by the first terminal, the first terminal and the second terminal, where interference between the first terminal and the second terminal in the first terminal pair is less than a preset threshold;  The receiving module is configured to receive a second signal that is sent by the base station by using the full-duplex time-frequency resource. The second terminal according to claim 45, wherein the receiving module is further configured to receive, by the base station, a downlink in a half-duplex downlink subframe, a half-duplex downlink frequency band, and an S subframe. A third signal transmitted on at least one of the pilot time slots.  The second terminal according to claim 46, wherein the half-duplex downlink subframe includes a fixed downlink subframe, and the fixed downlink subframe includes a subframe 0 and/or a sub-frame 5 frame. The second terminal according to claim 46, wherein the third signal is Sampling signal.  The second terminal according to claim 45, wherein the receiving module is further configured to receive a cyclic prefix orthogonally sent by the base station in a prefix time of an OFDM symbol in the fourth type of subframe. A frequency division multiplexed prefix of a CP-OFDM signal.  50. The second terminal according to claim 49, wherein the CP-OFDM signal is an oversampled signal.  The second terminal according to any one of claims 45-50, wherein the receiving module is further configured to receive a first pilot that is sent by the base station on a first full-duplex time-frequency resource. And the second full-duplex time-frequency resource used by the first full-duplex time-frequency resource and the at least one first terminal to send the second pilot signal to the base station is an orthogonal time-frequency resource.  The second terminal according to any one of claims 45-50, wherein the receiving module is further configured to receive a fourth pilot that is sent by the base station on a fourth full-duplex time-frequency resource. a signal; wherein, on the fourth full-duplex time-frequency resource, the base station remains silent.  A base station, comprising:  a receiver, configured to receive, by the at least one second terminal, a received signal strength of the first uplink reference signal that is reported by the second half-duplex uplink time-frequency resource; the received signal strength of the first uplink reference signal is the at least one The second terminal is obtained by measuring the first uplink reference signal sent by the at least one first terminal on the first half-duplex uplink time-frequency resource; and is further configured to receive, by the processor, the first terminal in the first terminal pair determined by the processor, The first signal sent by the configured full-duplex time-frequency resource;  The processor is configured to determine, according to the received signal strength of the first uplink reference signal, a first terminal pair from the at least a first terminal and the at least one second terminal, where the first terminal pair includes The first terminal and the second terminal, the interference between the first terminal and the second terminal in the first terminal pair is less than a preset threshold; and according to the received signal strength of the first uplink reference signal, the full duplex time is The frequency resources are respectively configured to the first terminal and the second terminal in the first terminal pair;  a transmitter, configured to send, by using a full-duplex time-frequency resource configured by the processor, a second signal to a second terminal in the first terminal pair;  The processor is further configured to obtain a self-interference cancellation signal according to the self-interference channel parameter and the second signal on the full-duplex time-frequency resource to perform self-interference cancellation. The base station according to claim 53, wherein the transmitter is further configured to notify the at least one second terminal to measure time-frequency resources, where the measured time-frequency resource includes the The first half uplink duplex time-frequency resource; and the signal parameter of the first uplink reference signal is sent to the at least one second terminal; the received signal strength of the first uplink reference signal is the at least one second terminal Obtaining, according to the signal parameter of the first uplink reference signal, on the measured time-frequency resource.  The base station according to claim 53 or 54, wherein the half-duplex downlink time-frequency resource comprises a half-duplex downlink subframe, a downlink pilot slot of the S-subframe, and a half-duplex downlink At least one of a frequency band and a prefix time of an OFDM symbol in a fourth type of subframe.  The base station according to claim 55, wherein the half-duplex downlink subframe comprises a fixed downlink subframe, and the fixed downlink subframe comprises a subframe 0 and/or a subframe 5.  The base station according to claim 55 or 56, wherein if the half-duplex downlink time-frequency resource is a half-duplex downlink subframe, the half-duplex downlink frequency band, and a downlink of the S subframe At least one of the pilot time slots, the transmitter is further configured to be used in the half-duplex downlink subframe, the half-duplex downlink frequency band, and the downlink pilot time slot of the S subframe Sending, to the at least one resource, a third signal to any terminal in the wireless communication system; the receiver is further configured to: in the half-duplex downlink subframe, the half-duplex downlink frequency band, and the S subframe Receiving a first received signal on at least one of the downlink pilot time slots; The processor is specifically configured to obtain a self-interference channel parameter according to the 3^=^*^ ₁₊ ^, where the ^ is the first received signal; Noise when interfering with channel estimation; said / ^ is said self-interference channel parameter; said said third signal.  The base station according to claim 57, wherein the first received signal and the third signal are oversampled signals.  The base station according to claim 55, wherein, if the half-duplex downlink time-frequency resource is a prefix time of an OFDM symbol in the fourth type of subframe, the transmitter is further used to Transmitting a prefix of a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) signal to the at least one second terminal in a prefix time of the OFDM symbol in the fourth type of subframe; the processor is further configured to schedule the Transmitting, by the first terminal, a prefix of the ZP-OFDM signal to the base station in a prefix time of the OFDM symbol in the fourth type of subframe; the receiver is further configured to be in the fourth type of subframe Receiving the second received signal within a prefix time of the OFDM symbol; The processor is specifically configured to obtain a self-interference channel parameter according to 3^=^*4+^; wherein: ₁ is the second received signal; and the self-interference channel estimation is performed by the base station Noise The / ^ is the self-interference channel parameter; the prefix is the CP-OFDM signal. 60. The base station according to claim 59, wherein the second received signal and the CP-OFDM signal are oversampled signals.  The base station according to any one of claims 53 to 60, wherein the transmitter is further configured to transmit the first pilot to the at least one second terminal by using a first full duplex time-frequency resource. Signal  The receiver is further configured to receive, by using the second full-duplex time-frequency resource, the second pilot signal sent by the at least one first terminal, where the first full-duplex time-frequency resource and the second The full-duplex time-frequency resource is an orthogonal time-frequency resource.  The base station according to any one of claims 53-60, wherein the receiver is further configured to receive, by using a third full duplex time-frequency resource, a third guide sent by the at least one first terminal. a frequency signal; wherein the transmitter remains silent on the third full duplex time-frequency resource.  The base station according to claim 62, wherein the transmitter is further configured to: transmit, by using a fourth full-duplex time-frequency resource, a fourth pilot signal to the at least one second terminal; The processor controls the at least one first terminal to remain silent on the fourth full duplex time-frequency resource.  64. A first terminal, comprising:  a transmitter, configured to send a first uplink reference signal on the first half-duplex uplink time-frequency resource, so that the at least one second terminal measures the received signal strength of the first uplink reference signal, and the first uplink The received signal strength of the reference signal is reported to the base station by using the second half-duplex uplink time-frequency resource; and is further configured to send the first signal to the base station by using the full-duplex time-frequency resource; the full-duplex time-frequency resource is the base station according to the base station The received signal strength of the first uplink reference signal is configured to the first terminal and the second terminal in the first terminal pair, where the first terminal pair includes the first terminal and the second terminal, and the first terminal The interference between the first terminal and the second terminal in the pair is less than a preset threshold.  The first terminal according to claim 64, wherein the first terminal further includes: a receiver, configured to receive, by the base station, a half-duplex downlink subframe, a half-duplex downlink frequency band, and an S subframe a third signal transmitted on at least one of the downlink pilot time slots.  The first terminal according to claim 65, wherein the half-duplex downlink subframe includes a fixed downlink subframe, and the fixed downlink subframe includes a subframe number 0 and/or a fifth subframe. frame. 67. The first terminal according to claim 65, wherein the third signal is Oversampled signal.  The first terminal according to claim 64, wherein the transmitter is further configured to send a zero prefix orthogonal frequency division to the base station within a prefix time of the OFDM symbol in the fourth type of subframe. The prefix of the ZP-OFDM signal is multiplexed.  The first terminal according to any one of claims 64 to 68, wherein the transmitter is further configured to send a second pilot signal to the base station by using a second full-duplex time-frequency resource; The first full-duplex time-frequency resource and the first full-duplex time-frequency resource used by the base station to send the first pilot signal to the at least one second terminal are orthogonal time-frequency resources.  The first terminal according to any one of claims 64 to 68, wherein the receiver is further configured to receive a third pilot signal that is sent by the base station by using a third full-duplex time-frequency resource. The base station remains silent on the third full-duplex time-frequency resource.  71. A second terminal, comprising:  a transmitter, configured to send a received signal strength of the first uplink reference signal to the base station by using the second half-duplex uplink time-frequency resource, so that the base station performs full-duplex according to the received signal strength of the first uplink reference signal The time-frequency resources are respectively configured to the first terminal and the second terminal in the first terminal pair; the received signal strength of the first uplink reference signal is that the second terminal is in the first half duplex by measuring at least one first terminal Acquiring the first uplink reference signal sent on the uplink time-frequency resource; the first terminal pair is the received signal strength of the base station according to the first uplink reference signal from the at least first terminal and at least one And determining, by the first terminal, the first terminal and the second terminal, where interference between the first terminal and the second terminal in the first terminal pair is less than a preset threshold;  And a receiver, configured to receive a second signal that is sent by the base station by using the full-duplex time-frequency resource. The second terminal according to claim 71, wherein the receiver is further configured to receive the downlink of the base station in a half-duplex downlink subframe, a half-duplex downlink frequency band, and an S subframe. A third signal transmitted on at least one of the pilot time slots.  The second terminal according to claim 72, wherein the half-duplex downlink subframe includes a fixed downlink subframe, and the fixed downlink subframe includes a subframe 0 and/or a fifth subframe. frame.  74. The second terminal of claim 72, wherein the third signal is an oversampled signal. The second terminal according to claim 71, wherein the receiver is further configured to: Receiving a prefix of a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) signal transmitted by the base station in a prefix time of an OFDM symbol in the fourth type of subframe.  76. The second terminal according to claim 75, wherein the CP-OFDM signal is an oversampled signal.  The second terminal according to any one of claims 71-76, wherein the receiver is further configured to receive a first pilot that is sent by the base station on a first full-duplex time-frequency resource. And the second full-duplex time-frequency resource used by the first full-duplex time-frequency resource and the at least one first terminal to send the second pilot signal to the base station is an orthogonal time-frequency resource.  The second terminal according to any one of claims 71 to 76, wherein the receiver is further configured to receive a fourth pilot that is sent by the base station on a fourth full-duplex time-frequency resource. a signal; wherein, on the fourth full-duplex time-frequency resource, the base station remains silent.