Method, device, system, new air interface base station and terminal for eliminating co-frequency interference

Abstract

The present disclosure relates to a method, device, system, new air interface base station and terminal for eliminating co-channel interference, and relates to the field of communication technology. The elimination method includes: a first NR base station receives CRS and subframe related information sent by an LTE base station through a relay node, and the LTE base station is co-deployed with a second NR base station; the first NR base station generates interference elimination information according to the related information; the first NR base station sends the interference elimination information to the terminal side, so that the terminal supporting the interference elimination capability eliminates the co-channel interference of the LTE base station to the second NR base station according to the interference elimination information.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular to a method for eliminating co-channel interference, a device for eliminating co-channel interference, a system for eliminating co-channel interference, a new air interface base station, a terminal, and a non-volatile computer-readable storage medium. Background Art

[0002] During the deployment of 5G networks, the low-frequency LTE (Long Term Evolution) spectrum needs to be refarmed to NR (New Radio).

[0003] However, many LTE spectrums are still used to carry data services, and the network load is relatively heavy, which makes refarming difficult. For example, there is a scenario where LTE and NR are deployed adjacently using the same frequency, that is, NR is deployed in a deployment area without LTE-related frequencies and uses the same frequency as LTE.

[0004] In the design process of NR system, the pilot signal with long transmission time like CRS is not adopted, but the CSI-RS signal with long transmission time is adopted. Therefore, the interference of neighboring cells of NR is relatively small.

[0005] However, current test results show that LTE's CRS has a very large interference on the NR system, and the NR system does not have a corresponding CRS elimination mechanism in the current specifications.

[0006] Moreover, in the current Xn Setup process and gNB Configuration Update process, there is no configuration information about CRS (Cell Reference Signal) in the E-UTRAN (Evolved Universal Mobile Telecommunications System Terrestrial Radio Access Network) neighbor relationship included.

[0007] In the related technology, the LTE system has introduced a variety of methods for eliminating neighboring cell CRS since Rel-11. The basic methods are as follows: interference elimination methods based on reducing transmit power or reducing transmission, such as the ABS (Almost Blank Subframe) method in Rel-11's eICIC (Enhanced Inter Cell Interference Coordination); interference elimination methods using advanced receivers, which can be based on MMSE-IRC (Minimum Mean Squared Error-Interference Rejection Combining) detection to achieve interference elimination, such as the NACIS (Network assistance Interference Cancellation and Suppression) technology introduced for LTE in Rel-14 and Rel-15; interference elimination methods based on synchronization information. Summary of the invention

[0008] The inventors of the present disclosure discovered that the above-mentioned related technologies have the following problems: there is a lack of interface and information acquisition means between the LTE base station and the NR base station, resulting in a lack of CRS and subframe related information in the neighboring cell information interacted by NR, causing the terminal to be unable to obtain interference elimination information to eliminate the co-channel interference between LTE and NR.

[0009] In view of this, the present disclosure proposes a technical solution for eliminating co-channel interference, which can eliminate the co-channel interference between LTE and NR.

[0010] According to some embodiments of the present disclosure, a method for eliminating co-channel interference is provided, which is executed by a first NR base station, including: the first NR base station receives CRS and subframe related information sent by an LTE base station through a relay node, and the LTE base station is co-deployed with a second NR base station; the first NR base station generates interference elimination information based on the related information; the first NR base station sends the interference elimination information to the terminal side, so that the terminal that supports the interference elimination capability eliminates the co-channel interference of the LTE base station to the second NR base station based on the interference elimination information.

[0011] In some embodiments, the relevant information of CRS and subframe is generated by the LTE base station and sent to the second NR base station deployed with it, and then sent to the first NR base station by the second NR base station serving as a relay node.

[0012] In some embodiments, the relevant information of CRS and subframe is sent by the second NR base station as part of the LTE neighbor cell information to the first NR base station through an interface establishment request (such as Xn Setup Request) or a radio access network configuration update request (such as NG-RANConfiguration Update Request) message.

[0013] In some embodiments, the first NR base station generates interference elimination information based on relevant information, including: the first NR base station obtains an interference cell set determined according to heterogeneous system measurement results of each terminal, and the interference intensity of the cells in the interference cell set is greater than the interference threshold; the first NR base station generates interference elimination information based on the interference cell set and relevant information.

[0014] In some embodiments, the first NR base station obtains the interference cell set determined according to the heterosystem measurement results of each terminal, including: the first NR base station determines the cell interference source of the LTE base station on which the first NR base station is affected according to the heterosystem measurement results reported by multiple terminals configured or stored by the network management; and determines the interference cell set according to the interference intensity of each cell interference source.

[0015] In some embodiments, the first NR base station obtains the interference cell set determined according to the heterosystem measurement results of each terminal, including: the first NR base station instructs each terminal to perform heterosystem measurements on each co-deployed LTE base station, so that each terminal reports the interference cell set determined according to the heterosystem measurement results.

[0016] In some embodiments, the first NR base station instructs each terminal to perform inter-system measurements on the co-deployed LTE base station, including: when the terminal supports SFTD (SFN and Frame boundary Timing Difference, system frame number and frame timing difference) measurement, instructing the terminal to perform SFTD measurement on at least one LTE cell in the interfering cell set to obtain the timing deviations of these LTE cells.

[0017] In some embodiments, the first NR base station sends interference elimination information to the terminal side, including: the first NR base station broadcasts the interference elimination information through SIB1 (System Information Type 1, system information block 1), so that the terminal supporting the interference elimination capability eliminates the CRS interference in the received information according to the interference elimination information, and the received information includes at least one of random process downlink information, paging, and other broadcast information other than SIB1.

[0018] In some embodiments, a terminal supporting interference cancellation capability eliminates co-channel interference through the following steps: determining the original transmitted signal of each CRS on the RE (Resource Element) symbol based on the interference cancellation information; restoring the CRS signal of each interfering cell based on the channel estimation result of each original transmitted signal; and eliminating the CRS signal of the corresponding interfering cell from the received signal.

[0019] In some embodiments, a terminal supporting interference cancellation capability restores the CRS signal of each interfering cell through the following steps: performing channel estimation on each antenna of the terminal and determining the covariance matrix of each channel estimation result; determining each receiving matrix based on each channel estimation result and its covariance matrix; and restoring the CRS signal of each interfering cell based on each receiving matrix.

[0020] In some embodiments, the first NR base station receives the cell reference signal CRS and subframe related information sent by the LTE base station through the relay node, including: the first NR base station instructs each terminal to perform heterogeneous system measurements on each co-deployed LTE base station; the first NR base station sends request information for related information of CRS and subframe to the relay node of the corresponding LTE base station based on the heterogeneous system measurement results of each terminal; the first NR base station obtains related information of CRS and subframe based on the response information of the relay node.

[0021] In some embodiments, sending request information for CRS and subframe related information to the relay node of the corresponding LTE base station includes: the first NR base station determines the connection mode of the corresponding LTE base station based on the network management configuration information; and determines the relay node and its corresponding request information based on the connection mode.

[0022] In some embodiments, request information for sending CRS and subframe related information to the relay node of the corresponding LTE base station includes: when the relay node is an AMF (Authentication Management Function) entity, the request message is sent to the AMF entity via a cross-core network message.

[0023] In some embodiments, the request information sent to the AMF entity includes the base station identifier of the corresponding LTE base station, the TAC (Tracking Area Code) information of the corresponding LTE base station, the base station identifier of the first NR base station, the TAC information supported by the first NR base station and a requested cell list. Each cell information in the requested cell list includes at least one of the requested CRS configuration information and subframe configuration information, and the corresponding LTE cell identifier.

[0024] In some embodiments, request information for sending CRS and subframe related information to the relay node of the corresponding LTE base station includes: when the relay node is an authentication management function AMF entity, the first NR base station generates corresponding request information and sends it to the AMF entity; the response information is obtained through the following steps: the AMF entity sends the request information to the corresponding mobility management MME entity; the MME entity generates request content information according to the identifier of the corresponding LTE base station and sends it to the corresponding LTE base station; the LTE base station generates response information according to the request content information and forwards it to the AMF entity; the AMF entity sends the response information to the first NR base station.

[0025] In some embodiments, the request content information includes the base station identifier of the first NR base station, the TAC information of the first NR base station, and the specific request content; the response information includes the base station identifier of the corresponding LTE base station, the TAC information of the corresponding LTE base station, the base station identifier of the first NR base station, the TAC information supported by the first NR base station, and a configuration message corresponding to the request.

[0026] In some embodiments, the request information for sending CRS and subframe related information to the relay node of the corresponding LTE base station includes: when the relay node is a second NR base station, the request message is sent to the second NR base station via a radio access network node configuration update (such as NG-RAN NODE CONFIGURATION UPDATE) message in the Xn interface message.

[0027] In some embodiments, the request message sent to the second NR base station includes a requested cell list, and each cell information in the requested cell list includes at least one of the requested CRS configuration information, subframe configuration information, and the corresponding LTE cell identifier.

[0028] In some embodiments, request information for sending related information of CRS and subframe to the relay node of the corresponding LTE base station includes: when the relay node is a second NR base station, the first NR base station will generate corresponding request information and send it to the second NR base station; the response information is obtained through the following steps: the second NR base station determines the related information of the CRS and subframe of the corresponding LTE base station according to the request information; the second NR base station sends the relevant information as response information to the first NR base station via the E-URAN neighbor cell configuration information in the radio access network node configuration update response (NG-RAN NODE CONFIGURATION UPDATE RESPONSE) in the Xn interface message.

[0029] In some embodiments, the elimination method also includes: the first NR base station receives and saves the capability information of supporting interference elimination sent by the terminal through the AMF entity; wherein the first NR base station sends the interference elimination information to the terminal side, including: the first NR base station sends the interference elimination information to the terminal supporting the interference elimination capability through an RRC (Radio Resource Control) connection reconfiguration message based on the saved capability information.

[0030] In some embodiments, the RRC connection reconfiguration message includes LTE's PCI (Physical Cell ID) information, CRS port type, downlink frequency, downlink bandwidth, and CRS pattern. The RRC connection reconfiguration message also includes at least one of a multicast / multicast single frequency network MBSFN subframe configuration, an all-empty subframe ABS subframe configuration, and a time deviation.

[0031] In some embodiments, a terminal supporting interference cancellation capability eliminates co-channel interference through the following steps: when the received signal is not an MBSFN subframe, the terminal performs CRS interference cancellation according to the interference cancellation information; when the received signal is an MBSFN subframe, the terminal does not perform CRS interference cancellation on the neighboring cell; when the received signal is an ABS subframe, the terminal skips the CRS interference cancellation processing of the ABS subframe.

[0032] In some embodiments, the relevant information of CRS and subframe includes LTE PCI information, LTE cell identifier, CRS port type, downlink frequency, downlink bandwidth, CRS pattern, and also includes at least one of MBSFN subframe configuration, ABS subframe configuration, and time deviation. The interference cancellation information includes an interference cancellation start indication and an interference cell set configuration list. The configuration information of each cell in the interference cell set configuration list includes the cell's PCI, downlink frequency, downlink bandwidth, CRS pattern, and also includes at least one of positioning reference, MBSFN subframe configuration, and ABS subframe configuration.

[0033] In some embodiments, the elimination method also includes: when the terminal does not support interference elimination capability but supports DSS (Dynamic Spectrum Sharing) capability, the first NR base station determines the LTE cell with the strongest interference based on the terminal's capabilities, CRS and subframe related information, and the relevant information includes CRS pattern, downlink frequency, downlink bandwidth, and MBSFN subframe configuration; the first NR base station performs RB (Resource Block) level rate configuration on the LTE cell for the terminal to eliminate co-channel interference for the terminal.

[0034] According to some other embodiments of the present disclosure, a method for eliminating co-channel interference is provided, which is executed by a terminal, including: the terminal receives interference elimination information sent by a first NR base station, the interference elimination information is generated by the first NR base station based on related information of CRS and subframes received from an LTE base station via a relay node; the terminal eliminates the co-channel interference of the LTE base station to the second NR base station based on the interference elimination information, and the LTE base station and the second NR base station are deployed at the same site.

[0035] In some embodiments, the elimination method also includes: the terminal performs heterogeneous system measurements on each co-deployed LTE base station to determine an interference cell set, and the interference intensity of the cells in the interference cell set is greater than an interference threshold; wherein the interference elimination information is generated by the first NR base station based on the interference cell set and related information.

[0036] In some embodiments, the elimination method also includes: the terminal sends the heterosystem measurement results to the first NR base station, so that the first NR base station determines the cell interference source of the LTE base station on which the first NR base station is affected according to the heterosystem measurement results reported by the terminal configured or stored by the network management, and then determines the interference cell set according to the interference intensity of each cell interference source.

[0037] In some embodiments, the elimination method also includes: according to the instruction of the first NR base station, the terminal performs heterogeneous system measurements on each co-deployed LTE base station; the terminal determines the interference cell set according to the heterogeneous system measurement results; and the terminal sends the interference cell set to the first NR base station.

[0038] In some embodiments, the terminal performs inter-system measurements on each co-deployed LTE base station, including: when SFTD measurement is supported, according to the instruction of the first NR base station, the terminal performs SFTD measurement on at least one LTE cell in the interference cell set to obtain and report the timing deviations of these LTE cells to the first NR base station.

[0039] In some embodiments, the terminal receives interference elimination information sent by the first NR base station, including: the terminal receives the interference elimination information broadcast by the first NR base station through SIB1; the terminal eliminates the co-channel interference of the LTE base station to the second NR base station according to the interference elimination information, including: the terminal eliminates CRS interference in the received information according to the interference elimination information, and the received information includes at least one of random process downlink information, paging, and other broadcast information other than SIB1.

[0040] In some embodiments, the terminal eliminates the co-channel interference of the LTE base station to the second NR base station according to the interference elimination information, including: the terminal determines the original transmission signal of each CRS on the resource element RE symbol according to the interference elimination information; the terminal restores the CRS signal of each interfering cell according to the channel estimation result of each original transmission signal; the terminal eliminates the CRS signal of the corresponding interfering cell from the received signal.

[0041] In some embodiments, the terminal restores the CRS signal of each interfering cell based on the channel estimation results of each original transmitted signal, including: the terminal performs channel estimation on each of its antennas and determines the covariance matrix of each channel estimation result; the terminal determines each receiving matrix based on each channel estimation result and its covariance matrix; the terminal restores the CRS signal of each interfering cell based on each receiving matrix.

[0042] In some embodiments, the elimination method also includes: according to the instructions of the first NR base station, the terminal performs heterogeneous system measurements on each co-deployed LTE base station; the terminal sends the heterogeneous system measurement results to the first NR base station, so that the first NR base station sends request information for related information of CRS and subframes to the relay node of the corresponding LTE base station based on the heterogeneous system measurement results, and obtains related information of CRS and subframes based on the response information of the relay node.

[0043] In some embodiments, the elimination method also includes: the terminal sends capability information supporting interference elimination to the first NR base station through the AMF entity; wherein, the terminal receives the interference elimination information sent by the first new air interface NR base station, including: the terminal receives the interference elimination information sent by the first NR base station through the RRC connection reconfiguration message based on the stored capability information.

[0044] In some embodiments, the terminal eliminates the co-channel interference of the LTE base station to the second NR base station according to the interference elimination information, including: when the received signal is not an MBSFN subframe, the terminal performs CRS interference elimination according to the interference elimination information; when the received signal is an MBSFN subframe, the terminal does not perform CRS interference elimination on the neighboring cell; when the received signal is an ABS subframe, the terminal skips the CRS interference elimination processing of the ABS subframe.

[0045] According to some further embodiments of the present disclosure, a new air interface base station is provided, and the new air interface base station as a first NR base station includes: a receiving unit, used to receive a cell reference signal CRS and related information of a subframe sent by an LTE base station through a relay node, and the LTE base station is co-deployed with a second NR base station; a processing unit, used to generate interference elimination information according to the relevant information; and a sending unit, used to send the interference elimination information to a terminal side, so that a terminal supporting interference elimination capability can eliminate the co-frequency interference of the LTE base station to the second NR base station according to the interference elimination information.

[0046] In some embodiments, the relevant information of CRS and subframe is generated by the LTE base station and sent to the second NR base station deployed with it, and then sent to the first NR base station by the second NR base station serving as a relay node.

[0047] In some embodiments, the relevant information of CRS and subframe is sent by the second NR base station to the first NR base station as part of the LTE neighbor cell information through an interface establishment request (Xn Setup Request) or a radio access network configuration update request (NG-RANConfiguration Update Request) message.

[0048] In some embodiments, the processing unit obtains an interference cell set determined according to heterogeneous system measurement results of each terminal, and the interference strength of cells in the interference cell set is greater than an interference threshold; and generates interference cancellation information according to the interference cell set and related information.

[0049] In some embodiments, the processing unit determines the cell interference source of the LTE base station that the first NR base station is affected by based on the network management configuration or the stored heterogeneous system measurement results reported by multiple terminals; and determines the interference cell set based on the interference intensity of each cell interference source.

[0050] In some embodiments, the processing unit instructs each terminal to perform heterogeneous system measurement on each co-located LTE base station, so that each terminal reports an interfering cell set determined according to the heterogeneous system measurement result.

[0051] In some embodiments, when the terminal supports SFTD measurement, the processing unit instructs the terminal to perform SFTD measurement on at least one LTE cell in the interference cell set to obtain the timing deviations of these LTE cells.

[0052] In some embodiments, the sending unit broadcasts interference cancellation information through the system information block SIB1, so that the terminal supporting the interference cancellation capability eliminates the CRS interference in the received information according to the interference cancellation information, and the received information includes at least one of the random process downlink information, paging, and other broadcast information other than SIB1.

[0053] In some embodiments, a terminal supporting interference cancellation capability eliminates co-channel interference through the following steps: determining the original transmitted signal of each CRS on the resource element RE symbol based on the interference cancellation information; restoring the CRS signal of each interfering cell based on the channel estimation result of each original transmitted signal; and eliminating the CRS signal of the corresponding interfering cell from the received signal.

[0054] In some embodiments, a terminal supporting interference cancellation capability restores the CRS signal of each interfering cell through the following steps: performing channel estimation on each antenna of the terminal and determining the covariance matrix of each channel estimation result; determining each receiving matrix based on each channel estimation result and its covariance matrix; and restoring the CRS signal of each interfering cell based on each receiving matrix.

[0055] In some embodiments, the processing unit instructs each terminal to perform heterogeneous system measurements on each co-deployed LTE base station; the sending unit sends request information for related information of CRS and subframes to the relay node of the corresponding LTE base station based on the heterogeneous system measurement results of each terminal; the processing unit obtains related information of CRS and subframes based on the response information of the relay node.

[0056] In some embodiments, the processing unit determines a connection mode of a corresponding LTE base station according to network management configuration information; and determines a relay node and its corresponding request information according to the connection mode.

[0057] In some embodiments, when the relay node is an AMF entity, the sending unit sends the request message to the AMF entity via a cross-core network message.

[0058] In some embodiments, the request information sent to the AMF entity includes the base station identifier of the corresponding LTE base station, the TAC information of the corresponding LTE base station, the base station identifier of the first NR base station, the TAC information supported by the first NR base station and a requested cell list. Each cell information in the requested cell list includes at least one of the requested CRS configuration information and subframe configuration information, and the corresponding LTE cell identifier.

[0059] In some embodiments, when the relay node is an AMF entity, the sending unit sends the generated corresponding request information to the AMF entity; the response information is obtained through the following steps: the AMF entity sends the request information to the corresponding MME entity; the MME entity generates request content information according to the identifier of the corresponding LTE base station and sends it to the corresponding LTE base station; the LTE base station generates response information according to the request content information and forwards it to the AMF entity; the AMF entity sends the response information to the first NR base station.

[0060] In some embodiments, the request content information includes the base station identifier of the first NR base station, the TAC information of the first NR base station, and the specific request content; the response information includes the base station identifier of the corresponding LTE base station, the TAC information of the corresponding LTE base station, the base station identifier of the first NR base station, the TAC information supported by the first NR base station, and a configuration message corresponding to the request.

[0061] In some embodiments, when the relay node is a second NR base station, the sending unit sends a request message to the second NR base station via a radio access network node configuration update message (such as NG-RAN NODE CONFIGURATION UPDATE) in the Xn interface message.

[0062] In some embodiments, the request message sent to the second NR base station includes a requested cell list, and each cell information in the requested cell list includes at least one of the requested CRS configuration information, subframe configuration information, and the corresponding LTE cell identifier.

[0063] In some embodiments, when the relay node is a second NR base station, the sending unit will generate corresponding request information and send it to the second NR base station; the response information is obtained through the following steps: the second NR base station determines the relevant information of the CRS and subframe of the corresponding LTE base station based on the request information; the second NR base station sends the relevant information as response information to the first NR base station through the E-URAN neighbor cell configuration information in the radio access network node configuration update response (such as NG-RAN NODE CONFIGURATION UPDATE RESPONSE) in the Xn interface message.

[0064] In some embodiments, the receiving unit receives and saves the interference cancellation capability information sent by the terminal through the AMF entity; the sending unit sends the interference cancellation information to the terminal supporting the interference cancellation capability through the radio resource control RRC connection reconfiguration message based on the saved capability information.

[0065] In some embodiments, the RRC connection reconfiguration message includes LTE PCI information, CRS port type, downlink frequency, downlink bandwidth, and CRS pattern. The RRC connection reconfiguration message also includes at least one of multicast / multicast single frequency network MBSFN subframe configuration, all-space subframe ABS subframe configuration, and time deviation.

[0066] In some embodiments, a terminal supporting interference cancellation capability eliminates co-channel interference through the following steps: when the received signal is not an MBSFN subframe, the terminal performs CRS interference cancellation according to the interference cancellation information; when the received signal is an MBSFN subframe, the terminal does not perform CRS interference cancellation on the neighboring cell; when the received signal is an ABS subframe, the terminal skips the CRS interference cancellation processing of the ABS subframe.

[0067] In some embodiments, the relevant information of CRS and subframe includes LTE PCI information, LTE cell identifier, CRS port type, downlink frequency, downlink bandwidth, CRS pattern, and also includes at least one of MBSFN subframe configuration, ABS subframe configuration, and time deviation. The interference cancellation information includes an interference cancellation start indication and an interference cell set configuration list. The configuration information of each cell in the interference cell set configuration list includes the cell's PCI, downlink frequency, downlink bandwidth, CRS pattern, and also includes at least one of positioning reference, MBSFN subframe configuration, and ABS subframe configuration.

[0068] In some embodiments, when the terminal does not support interference elimination capability but supports DSS capability, the processing unit determines the LTE cell with the strongest interference based on the capabilities of the terminal, CRS and subframe related information, the relevant information including CRS pattern, downlink frequency, downlink bandwidth, MBSFN subframe configuration, and the processing unit performs RB-level rate configuration on the LTE cell for the terminal to eliminate co-channel interference for the terminal.

[0069] According to some further embodiments of the present disclosure, a terminal is provided, including: a receiving unit, used to receive interference elimination information sent by a first NR base station, the interference elimination information is generated by the first NR base station based on relevant information of CRS and subframes received from an LTE base station via a relay node; a processing unit, used to eliminate the co-frequency interference of the LTE base station to the second NR base station based on the interference elimination information, and the LTE base station and the second NR base station are deployed at the same site.

[0070] In some embodiments, the processing unit performs heterogeneous system measurements on each co-deployed LTE base station to determine an interference cell set, the interference intensity of the cells in the interference cell set is greater than the interference threshold, and the interference elimination information is generated by the first NR base station based on the interference cell set and related information.

[0071] In some embodiments, the terminal also includes a sending unit for sending the heterosystem measurement results to the first NR base station, so that the first NR base station can determine the cell interference source of the LTE base station on which the first NR base station is affected according to the heterosystem measurement results reported by the terminal configured or stored by the network management, and then determine the interference cell set according to the interference intensity of each cell interference source.

[0072] In some embodiments, the processing unit performs heterogeneous system measurements on each co-deployed LTE base station according to the instructions of the first NR base station; determines an interfering cell set according to the heterogeneous system measurement results; and the sending unit sends the interfering cell set to the first NR base station.

[0073] In some embodiments, when SFTD measurement is supported, the processing unit performs SFTD measurement on at least one LTE cell in the interference cell set according to the instruction of the first NR base station to obtain and report the timing deviation of these LTE cells to the first NR base station.

[0074] In some embodiments, the receiving unit receives interference elimination information broadcast by the first NR base station through SIB1; the processing unit eliminates CRS interference in the received information according to the interference elimination information, and the received information includes at least one of random process downlink information, paging, and other broadcast information other than SIB1.

[0075] In some embodiments, the processing unit determines the original transmitted signal of each CRS on the RE symbol based on the interference elimination information; the processing unit restores the CRS signal of each interfering cell based on the channel estimation result of each original transmitted signal; the processing unit eliminates the CRS signal of the corresponding interfering cell from the received signal.

[0076] In some embodiments, the processing unit performs channel estimation on each of its antennas and determines the covariance matrix of each channel estimation result; the processing unit determines each receiving matrix based on each channel estimation result and its covariance matrix; the processing unit restores the CRS signal of each interfering cell based on each receiving matrix.

[0077] In some embodiments, according to the instructions of the first NR base station, the processing unit performs heterogeneous system measurements on each co-deployed LTE base station; the sending unit sends the heterogeneous system measurement results to the first NR base station, so that the first NR base station sends request information for related information of CRS and subframes to the relay node of the corresponding LTE base station based on the heterogeneous system measurement results, and obtains related information of CRS and subframes based on the response information of the relay node.

[0078] In some embodiments, the sending unit sends capability information supporting interference elimination to the first NR base station through the AMF entity; the receiving unit receives the interference elimination information sent by the first NR base station through the RRC connection reconfiguration message based on the stored capability information.

[0079] In some embodiments, when the received signal is not an MBSFN subframe, the processing unit performs CRS interference elimination according to the interference elimination information; when the received signal is an MBSFN subframe, the processing unit does not perform CRS interference elimination on the neighboring cell; when the received signal is an ABS subframe, the processing unit skips the CRS interference elimination processing of the ABS subframe.

[0080] According to some further embodiments of the present disclosure, a system for eliminating co-channel interference is provided, including: a new air interface base station, serving as a first NR base station for executing the method for eliminating co-channel interference on the base station side in any of the above embodiments; a terminal, for executing the method for eliminating co-channel interference on the terminal side in any of the above embodiments; a relay node, for forwarding CRS and subframe related information sent by an LTE base station to the first NR base station, and the LTE base station is co-deployed with the second NR base station.

[0081] In some embodiments, the relay node is an AMF entity, which sends request information for related information of CRS and subframe sent by the first NR base station to the corresponding MME entity. The MME entity generates request content information according to the identifier of the corresponding LTE base station and sends it to the corresponding LTE base station. The LTE base station generates response information according to the request content information and forwards it to the AMF entity. The AMF entity sends the response information to the first NR base station.

[0082] In some embodiments, the relay node is a second NR base station, which determines the relevant information of the CRS and subframe of the corresponding LTE base station based on the request information of the relevant information of the CRS and subframe sent by the first NR base station, and sends the relevant information as response information to the first NR base station through the E-URAN neighbor cell configuration information in the radio access network node configuration update response (such as NG-RAN NODE CONFIGURATION UPDATE RESPONSE) in the Xn interface message.

[0083] According to some further embodiments of the present disclosure, a co-channel interference elimination device is provided, comprising: a memory; and a processor coupled to the memory, wherein the processor is configured to execute the co-channel interference elimination method in any of the above embodiments based on instructions stored in the memory device.

[0084] According to some further embodiments of the present disclosure, a non-volatile computer-readable storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the method for eliminating co-channel interference in any of the above embodiments is implemented.

[0085] In the above embodiment, the NR base station obtains the relevant information of the CRS and subframes through the relay node between the LTE base station to generate interference cancellation information, and sends the interference cancellation information to the terminal side for eliminating the co-channel interference. In this way, the terminal can eliminate the co-channel interference between LTE and NR based on the interference cancellation information sent by the network side. BRIEF DESCRIPTION OF THE DRAWINGS

[0086] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0087] The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings:

[0088] Figure 1 A flowchart showing some embodiments of the method for eliminating co-channel interference disclosed in the present invention;

[0089] Figure 2 Flowcharts showing other embodiments of the method for eliminating co-channel interference disclosed in the present invention;

[0090] Figure 3 A signaling diagram showing some embodiments of the method for eliminating co-channel interference disclosed in the present invention;

[0091] Figure 4a A signaling diagram showing other embodiments of the method for eliminating co-channel interference disclosed in the present invention;

[0092] Figure 4b A signaling diagram showing other embodiments of the method for eliminating co-channel interference disclosed in the present invention;

[0093] Figure 4c A signaling diagram showing other embodiments of the method for eliminating co-channel interference disclosed in the present invention;

[0094] Figure 5 Schematic diagrams showing some embodiments of the method for eliminating co-channel interference disclosed in the present invention;

[0095] Figure 6 A block diagram showing some embodiments of the new air interface base station disclosed in the present invention;

[0096] Figure 7 A block diagram showing some embodiments of the terminal of the present disclosure;

[0097] Figure 8 A block diagram showing some embodiments of the apparatus for eliminating co-channel interference disclosed in the present invention;

[0098] Fig. 9 A block diagram showing some other embodiments of the apparatus for eliminating co-channel interference disclosed in the present invention;

[0099] Fig.10 A block diagram showing some embodiments of the co-channel interference elimination system of the present disclosure. DETAILED DESCRIPTION

[0100] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure unless otherwise specifically stated.

[0101] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0102] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0103] Technologies, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but where appropriate, the technologies, methods and equipment should be considered part of the authorization specification.

[0104] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0105] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0106] As mentioned above, the method based on reducing the transmission power or reducing the transmission will cause some downlink resources to be unavailable for ordinary terminals, resulting in reduced system performance. In addition, since the LTE FDD (Frequency Division Duplexing) system uses frequency synchronization instead of time synchronization in the existing network, the method based on synchronization information requires accurate acquisition of the timing deviation between the remaining NRFDDs.

[0107] That is to say, in the process of 5G network deployment, in order to eliminate CRS interference from LTE, the current 5G protocol still has the following defects.

[0108] The terminal side lacks LTE CRS-related auxiliary information. Although the frequency is the same as LTE, the terminal is usually unable to perform inter-system measurements on neighboring cells at the same time, and needs to measure the GAP (interval). In addition, the LTE FDD system usually uses frequency synchronization rather than time synchronization, so the neighboring cell LTE FDD system and NR FDD system may not be synchronized, resulting in the terminal being unable to accurately estimate the location of LTE's CRS.

[0109] There is a lack of interfaces and acquisition methods between LTE base stations and NR base stations. In LTE systems, CRS configuration information (including port number, MBSFN subframe configuration, etc.) is usually exchanged through the X2 interface. However, in SA (standalone networking) scenarios, LTE and NR cannot exchange information through the interface, and NR cannot automatically obtain information in an effective way.

[0110] In addition, considering that in the current interface interaction process, the neighboring cell configuration information of the sender defined in the protocol is optional, if it is not sent to the target side, the target side cannot configure the corresponding interference algorithm according to the neighboring cell configuration information.

[0111] The CRS and subframe configuration information of the LTE neighboring cells are missing in the neighboring cell information exchanged by NR. Currently, in the Xn interface, the E-UTRAN cell can be exchanged to the NR neighboring cell as a neighboring cell. However, the current protocol only has a few frequency configuration information, and lacks relevant configuration information about the CRS port and frame structure. Therefore, the NR base station cannot obtain valid information about the LTE base station.

[0112] The terminal does not have relevant interference cancellation information during the idle state and initial connection establishment process. Since the terminal can only obtain relevant configuration information from broadcast messages during the idle state and random access process, and it has not yet been fully synchronized with the network, it lacks relevant interference cancellation configuration and methods.

[0113] Based on the above requirements and reason analysis, the current 3GPP (3rd Generation Partnership Project) LTE and NR protocols cannot meet the requirements and need to be enhanced in new ways to meet the needs of network deployment and optimization.

[0114] Therefore, in view of the problem of LTE CRS interference to NR in the LTE and NR co-channel deployment scenario, the terminal disclosed in the present invention can eliminate the CRS interference from the LTE cell based on the auxiliary information sent by the network side, thereby reducing the co-channel interference from the neighboring cell, improving the throughput of the terminal and the system, and improving the user experience. For example, the technical solution of the present invention can be implemented through the following embodiments.

[0115] Figure 1 A flow chart showing some embodiments of the method for eliminating co-channel interference of the present disclosure.

[0116] like Figure 1 As shown, for the base station side, in step 110, the first NR base station receives CRS and subframe related information sent by the LTE base station through the relay node. The LTE base station and the second NR base station are co-deployed.

[0117] For example, the relevant information of CRS and subframe includes LTE PCI information, LTE cell identifier, CRS port type, downlink frequency, downlink bandwidth, CRS pattern, and at least one of MBSFN subframe configuration, ABS subframe configuration, and time deviation.

[0118] In some embodiments, the technical solution of the present disclosure can assist the terminal in performing interference elimination in two ways: network-side assisted interference elimination based on public signaling configuration; network-side assisted interference elimination based on dedicated signaling configuration.

[0119] In some embodiments, for the method of utilizing public signaling, relevant information of CRS and subframe is generated by the LTE base station and sent to the second NR base station deployed with it, and then sent to the first NR base station by the second NR base station serving as a relay node.

[0120] For example, the relevant information of CRS and subframe is sent by the second NR base station to the first NR base station through an XnSetup Request or NG-RAN Configuration Update Request message as part of the LTE neighbor information. The first NR base station generates interference cancellation information based on the interference cell set and related information.

[0121] The first NR base station instructs each terminal to perform inter-system measurement on each co-deployed LTE base station;

[0122] In some embodiments, for the method using dedicated signaling, the first NR base station sends request information for related information of CRS and subframe to the relay node of the corresponding LTE base station based on the inter-system measurement results of each terminal; the first NR base station obtains related information of CRS and subframe based on the response information of the relay node.

[0123] For example, the first NR base station determines the connection mode of the corresponding LTE base station based on the network management configuration information; and determines the relay node and its corresponding request information based on the connection mode.

[0124] In some embodiments, when the relay node is an AMF entity, the request message is sent to the AMF entity via a cross-core network message.

[0125] For example, the request information sent to the AMF entity includes the base station identifier of the corresponding LTE base station, the TAC information of the corresponding LTE base station, the base station identifier of the first NR base station, the TAC information supported by the first NR base station, and the requested cell list. Each cell information in the requested cell list includes at least one of the requested CRS configuration information and subframe configuration information, and the corresponding LTE cell identifier.

[0126] In some embodiments, when the relay node is an AMF entity, the first NR base station generates corresponding request information and sends it to the AMF entity.

[0127] The response information is obtained through the following steps: the AMF entity sends the request information to the corresponding MME entity; the MME entity generates the request content information according to the identifier of the corresponding LTE base station and sends it to the corresponding LTE base station; the LTE base station generates the response information according to the request content information and forwards it to the AMF entity; the AMF entity sends the response information to the first NR base station.

[0128] For example, the request content information includes the base station identifier of the first NR base station, the TAC information of the first NR base station, and the specific request content. The response information includes the base station identifier of the corresponding LTE base station, the TAC information of the corresponding LTE base station, the base station identifier of the first NR base station, the TAC information supported by the first NR base station, and the configuration message corresponding to the request.

[0129] In some embodiments, when the relay node is a second NR base station, the request message is sent to the second NR base station via the Xn interface message NG-RANNODE CONFIGURATION UPDATE.

[0130] For example, the request message sent to the second NR base station includes a requested cell list. Each cell information in the requested cell list includes at least one of the requested CRS configuration information and subframe configuration information, and a corresponding LTE cell identifier.

[0131] In some embodiments, when the relay node is a second NR base station, the first NR base station will generate corresponding request information and send it to the second NR base station.

[0132] The response information is obtained through the following steps: the second NR base station determines the relevant information of the CRS and subframe of the corresponding LTE base station based on the request information; the second NR base station sends the relevant information as response information to the first NR base station through the E-URAN neighbor cell configuration information in the Xn interface message NG-RAN NODE CONFIGURATIONUPDATE RESPONSE.

[0133] In step 120, the first NR base station generates interference cancellation information according to the relevant information. For example, the interference cancellation information includes an interference cancellation activation indication and an interference cell set configuration list, and each cell configuration information in the interference cell set configuration list includes the cell's PCI, downlink frequency, downlink bandwidth, CRS pattern, and at least one of a positioning reference, MBSFN subframe configuration, and ABS subframe configuration.

[0134] In some embodiments, the first NR base station obtains an interference cell set determined according to the heterogeneous system measurement results of each terminal. The interference strength of the cell in the interference cell set is greater than the interference threshold;

[0135] In some embodiments, for the method of utilizing public signaling, the first NR base station determines the cell interference source of the LTE base station that the first NR base station is affected by based on the network management configuration or the heterogeneous system measurement results reported by multiple terminals that are stored; and determines the interference cell set based on the interference intensity of each cell interference source.

[0136] In some embodiments, for the method using dedicated signaling, the first NR base station instructs each terminal to perform heterosystem measurements on each co-deployed LTE base station, so that each terminal reports the interfering cell set determined according to the heterosystem measurement results.

[0137] For example, when the terminal supports SFTD measurement, the terminal is instructed to perform SFTD measurement on at least one LTE cell in the interference cell set to obtain the timing deviations of these LTE cells.

[0138] In step 130, the first NR base station sends interference cancellation information to the terminal side, so that the terminal supporting the interference cancellation capability eliminates the co-channel interference of the LTE base station to the second NR base station according to the interference cancellation information.

[0139] In some embodiments, for the method of using public signaling, the first NR base station can broadcast interference cancellation information through SIB1, so that the terminal supporting interference cancellation capability can eliminate CRS interference in the received information according to the interference cancellation information. The received information includes at least one of random process downlink information, paging, and other broadcast information other than SIB1.

[0140] In some embodiments, for the method using dedicated signaling, the first NR base station receives and saves the interference cancellation capability information sent by the terminal through the AMF entity; the first NR base station sends the interference cancellation information to the terminal supporting the interference cancellation capability through the RRC connection reconfiguration message based on the saved capability information.

[0141] For example, the RRC connection reconfiguration message includes LTE PCI information, CRS port type, downlink frequency, downlink bandwidth, and CRS pattern. The RRC connection reconfiguration message also includes at least one of MBSFN subframe configuration, ABS subframe configuration, and time offset.

[0142] In some embodiments, a terminal supporting interference cancellation capability eliminates co-channel interference through the following steps: determining the original transmitted signal of each CRS on the RE symbol based on the interference cancellation information; restoring the CRS signal of each interfering cell based on the channel estimation result of each original transmitted signal; and eliminating the CRS signal of the corresponding interfering cell from the received signal.

[0143] For example, channel estimation is performed on each antenna of the terminal, and the covariance matrix of each channel estimation result is determined; each receiving matrix is ​​determined according to each channel estimation result and its covariance matrix; and the CRS signal of each interfering cell is restored according to each receiving matrix.

[0144] In some embodiments, a terminal supporting interference cancellation capability eliminates co-channel interference through the following steps: when the received signal is not an MBSFN subframe, the terminal performs CRS interference cancellation according to the interference cancellation information; when the received signal is an MBSFN subframe, the terminal does not perform CRS interference cancellation on the neighboring cell; when the received signal is an ABS subframe, the terminal skips the CRS interference cancellation processing of the ABS subframe.

[0145] In some embodiments, when the terminal does not support interference cancellation capability but supports DSS capability, the first NR base station determines the LTE cell with the strongest interference based on the capabilities of the terminal, CRS, and related information of the subframe. For example, the relevant information includes CRS pattern, downlink frequency, downlink bandwidth, and MBSFN subframe configuration. The first NR base station performs RB-level rate configuration on the LTE cell for the terminal to eliminate co-channel interference for the terminal.

[0146] Figure 2 Flowcharts showing other embodiments of the method for eliminating co-channel interference of the present disclosure.

[0147] like Figure 2 As shown, for the terminal side, in step 210, the terminal receives interference cancellation information sent by the first NR base station. The interference cancellation information is generated by the first NR base station based on the CRS and subframe related information received from the LTE base station through the relay node.

[0148] In some embodiments, for the method of utilizing public signaling, the terminal receives interference cancellation information broadcast by the first NR base station through SIB1.

[0149] In some embodiments, for the method using dedicated signaling, the terminal sends capability information supporting interference elimination to the first NR base station through the AMF entity; the terminal receives the interference elimination information sent by the first NR base station through the RRC connection reconfiguration message based on the stored capability information.

[0150] In some embodiments, for the method of using public signaling, the terminal performs heterogeneous system measurements on each co-deployed LTE base station to determine the interference cell set. The interference intensity of the cells in the interference cell set is greater than the interference threshold. The interference cancellation information is generated by the first NR base station based on the interference cell set and related information.

[0151] For example, the terminal sends the heterogeneous system measurement results to the first NR base station, so that the first NR base station can determine the cell interference source of the LTE base station to which the first NR base station is subjected according to the network management configuration or the stored heterogeneous system measurement results reported by the terminal; and then determine the interference cell set according to the interference intensity of each cell interference source.

[0152] In some embodiments, for the method using public signaling, according to the instruction of the first NR base station, the terminal performs heterogeneous system measurements on each co-deployed LTE base station; the terminal sends the heterogeneous system measurement results to the first NR base station, so that the first NR base station sends request information for related information of CRS and subframes to the relay node of the corresponding LTE base station based on the heterogeneous system measurement results; and obtains related information of CRS and subframes according to the response information of the relay node.

[0153] In some embodiments, using dedicated signaling, at the instruction of the first NR base station, the terminal performs heterogeneous system measurements on each co-deployed LTE base station; the terminal determines the interfering cell set based on the heterogeneous system measurement results; and the terminal sends the interfering cell set to the first NR base station.

[0154] For example, when SFTD measurement is supported, according to the instruction of the first NR base station, the terminal performs SFTD measurement on at least one LTE cell in the interference cell set to obtain and report the timing deviation of these LTE cells to the first NR base station.

[0155] In step 220, the terminal eliminates the co-channel interference of the LTE base station to the second NR base station according to the interference elimination information. The LTE base station and the second NR base station are co-deployed.

[0156] In some embodiments, the terminal determines the original transmitted signal of each CRS on the RE symbol based on the interference elimination information; the terminal restores the CRS signal of each interfering cell based on the channel estimation result of each original transmitted signal; the terminal eliminates the CRS signal of the corresponding interfering cell from the received signal.

[0157] For example, the terminal performs channel estimation on each of its antennas and determines the covariance matrix of each channel estimation result; the terminal determines each receiving matrix based on each channel estimation result and its covariance matrix; the terminal restores the CRS signal of each interfering cell based on the receiving matrix.

[0158] In some embodiments, for the method of using common signaling, the terminal eliminates CRS interference in the received information according to the interference elimination information. The received information includes at least one of random process downlink information, paging, and other broadcast information other than SIB1.

[0159] In some embodiments, for the method using dedicated signaling, when the received signal is not an MBSFN subframe, the terminal performs CRS interference elimination according to the interference elimination information; when the received signal is an MBSFN subframe, the terminal does not perform CRS interference elimination on the neighboring cell; when the received signal is an ABS, the terminal skips the CRS interference elimination processing of the ABS.

[0160] In some embodiments, the main idea of ​​network-side assisted interference elimination based on public signaling configuration is: the first base station generates interference elimination configuration information for broadcast message transmission based on CRS and subframe related information sent by the LTE base station through the relay node; after the terminal obtains the relevant information, it performs CRS interference elimination on the broadcast message and the downlink received data in the random access process; and after accessing the network, the terminal notifies the network of its ability to support CRS interference elimination. For example, Figure 3 The embodiments in the present invention implement network-side assisted interference cancellation based on common signaling configuration.

[0161] Figure 3 A signaling diagram showing some embodiments of the method for eliminating co-channel interference of the present disclosure.

[0162] like Figure 3 As shown, in event 310, the LTE base station generates relevant information of the CRS and subframe of LTE. If there is a second NR base station deployed at the same site, the relevant information of the CRS and subframe is sent to the second NR base station.

[0163] For example, relevant information of CRS and subframe may include LTE PCI information, LTE cell identifier, CRS port type, downlink frequency, downlink bandwidth, CRS pattern, MBSFN subframe configuration (such as describing the situation where it is configured as an MBSFN subframe with a period of 40ms, and adopting EUTRA-MBSFN-Subframe ConfigList defined in the relevant technology, etc.), ABS subframe configuration (such as describing the situation where it is configured as an ABS subframe with a period of 40ms), time deviation (if the time can be obtained, the result is given by the deviation value from the reference time modulo the SFN frame length).

[0164] In event 320, the second NR base station, as a relay node, sends the CRS and subframe related information of the LTE cell as part of the LTE neighbor cell information to the first NR base station through an Xn Setup Request or NG-RAN Configuration UpdateRequest message.

[0165] In event 330, the first NR base station determines the interference source from the LTE cell to which the second NR base station is subjected based on the network management configuration or the stored heterogeneous system measurement results reported by multiple terminals. For example, cells with interference higher than a preset threshold can be added to the interference cell set.

[0166] In event 340, the first NR base station generates interference cancellation information based on the interference cell set and broadcasts it on the air interface through the SIB1 message.

[0167] For example, the interference cancellation information includes an interference cancellation start indication (used to instruct a terminal with interference cancellation capability to perform interference cancellation according to the following information in real time) and an interference set configuration list.

[0168] The configuration information of each cell in the interference set configuration list includes the cell's PCI, downlink frequency, downlink bandwidth (such as n6, n15, n25, n50, n75, n100, etc., the unit is the number of resource blocks RB), CRS pattern (such as v-shift defined in 3GPP related technology), positioning reference (optional, the timing deviation value with the current cell can be used), MBSFN subframe configuration (optional, such as using 40ms as a period to describe the situation where it is configured as an MBSFN subframe, the EUTRA-MBSFN-Subframe ConfigList defined in the related technology can be used), ABS subframe configuration (optional, such as using 40ms as a period to describe the situation where it is configured as an ABS subframe).

[0169] In event 350, after the terminal receives the SIB1 message sent by the first NR base station, if the terminal supports interference cancellation capability, it will perform CRS interference cancellation of the LTE neighboring cell based on the auxiliary information on the network side when receiving random process downlink messages, receiving paging, and receiving other SIB broadcast messages except SIB1.

[0170] In some embodiments, for each interfering cell, the terminal generates the target LTE CRS sequence according to the PCI and CRS pattern of the cell; and determines the time-frequency position and carrier position of the CRS according to the downlink bandwidth, downlink frequency and positioning reference, and determines the original transmission signal of each CRS on the RE symbol. For example, the original transmission signal of the jth receiving antenna of the terminal on the kth subcarrier and the lth symbol is d j (k,l).

[0171] Then, the channel of the jth receiving antenna of the terminal at the kth subcarrier and the lth symbol is estimated, and the result is The covariance matrix of the channel estimation result can be expressed as:

[0172]

[0173]

[0174]

[0175] P1 is the target cell CRS transmission power, which is equal to the received E[|d j (k,l)| 2 ],N sp Represents the sampling rate of RE, N BS is the number of antennas, and n(k,l) is the noise.

[0176] Calculate the receiving matrix:

[0177]

[0178] After restoration, the CRS signal of each interfering cell is:

[0179]

[0180] The terminal can subtract the CRS signals of all interfered cells from the received signal, and then complete the detection result of the RE after removing the CRS interference signal through MMSE.

[0181] In some embodiments, the main idea of ​​network-side assisted interference elimination based on dedicated signaling configuration is: the first NR base station requests the LTE base station to obtain the CRS configuration information of the interfering LTE cell according to the measurement result of the terminal; the second LTE base station sends other CRS-related configuration information and synchronization information through the relay node; after obtaining the configuration information and synchronization information, the first NR base station sends the CRS configuration information and synchronization information of multiple LTE cells that interfere with the second NR base station to the terminal; the terminal completes the determination of the interference elimination scheme of the corresponding interference source on different subframes based on the network-side configuration information. For example, network-side assisted interference elimination based on dedicated signaling configuration can be implemented through the embodiment in Figure 4.

[0182] Figure 4a Signaling diagrams showing other embodiments of the method for eliminating co-channel interference of the present disclosure.

[0183] like Figure 4a As shown, in event 410, the terminal sends the capability information of supporting CRS interference elimination to the AMF entity through the NAS (Non-Access Stratum) information element in the RRC Setup Complete message.

[0184] In event 420, after the AMF entity receives the NAS message sent by the terminal, it sends the capability information to the first NR base station through the Initial UE ContextSetup message.

[0185] The first NR base station stores the capability information of the terminal and determines whether the terminal can be configured with interference cancellation capability in the connected state based on whether the terminal supports CRS interference cancellation.

[0186] In event 430, the first NR base station instructs the terminal to perform heterogeneous system measurements on the same-frequency LTE base station through RRC configuration. Based on the measurement results, the terminal reports the set of LTE interference cells that meet the conditions to the first NR base station.

[0187] For example, if the terminal also supports SFTD measurement, and for the first NR base station, there is at least one cell in the interference cell set whose timing deviation relative to the first NR base station is unknown, the first NR base station may also instruct the terminal to perform SFTD measurement on at least one LTE cell in the interference cell set. The terminal then feeds back the timing deviation value to the network side based on the measurement result.

[0188] In event 440, the first NR base station checks whether the cells in the interfering cell set have relevant information about CRS and subframes. If one of the cells does not have the above information, the connection method with the LTE base station is determined according to the network management configuration information. A corresponding configuration request message is generated and sent to the relay node to obtain relevant information about the CRS and subframes of the first LTE base station.

[0189] In some embodiments, if the relay node is the first NR base station, Figure 4b The signaling diagram in implements event 440.

[0190] Figure 4b Signaling diagrams showing other embodiments of the method for eliminating co-channel interference of the present disclosure.

[0191] like Figure 4b As shown, in event 4410, the first NR base station sends a first request message to the second NR base station through the Xn interface message NG-RAN NODECONFIGURATION UPDATE.

[0192] For example, the first request information includes a requested cell list. The information of each cell packet in the requested cell list includes an identifier of an LTE cell (such as ECGI information) and request content (such as at least one of requested CRS configuration information and requested subframe configuration information).

[0193] In event 4420, the second NR base station receives the first request information and obtains the CRS and subframe configuration information of the LTE base station through the internal interface.

[0194] In event 4430, the second NR base station sends a request response to the first NR base station through the E-URAN neighbor cell configuration information in the Xn interface message NG-RAN NODE CONFIGURATION UPDATE RESPONSE. The request response is generated according to the corresponding configuration information required by the request content, and the specific content can adopt the relevant information of CRS and subframe in any of the above embodiments.

[0195] In some embodiments, if the relay node is an entity, then Figure 4c The signaling diagram in implements event 440.

[0196] Figure 4c Signaling diagrams showing other embodiments of the method for eliminating co-channel interference of the present disclosure.

[0197] like Figure 4c As shown, in event 4440, the first NR base station sends the second request information to the AMF entity through a second cross-core network message.

[0198] For example, the second request information includes the base station identifier of the LTE base station, the TAC information of the LTE base station, the base station identifier of the first NR base station, the TAC information supported by the first NR base station, and a requested cell list. The information of each cell in the requested cell list includes the identifier of the LTE cell and the request content (such as at least one of the requested CRS configuration information and the requested subframe configuration information).

[0199] In event 4450, after receiving the second request information, the AMF entity determines the MME entity based on the TAC information of the LTE base station and sends the second request information to the MME entity.

[0200] In event 4460, the MME entity generates a request content message according to the identifier of the LTE base station, determines the destination base station to which the message is forwarded, and sends the request content information to the LTE base station. For example, the request content message includes the base station identifier of the first NR base station, the TAC information of the first NR base station, and the specific request content.

[0201] In event 4470, the LTE base station receives the request content message, generates a response message of the request content, and sends it to the MME entity.

[0202] In event 4480, the MME entity determines the AMF entity to which the message is forwarded based on the TAC information of the first NR base station, and forwards the message to the AMF entity.

[0203] In event 4490, the AMF entity determines the base station to which the response information needs to be sent based on the first NR base station identifier, and sends the corresponding information to the first NR base station.

[0204] For example, the response message of the request content includes the base station identifier of the LTE base station, the TAC information of the LTE base station, the base station identifier of the first NR base station, the TAC information supported by the first NR base station, and the requested configuration message (the specific content is provided according to the request indication).

[0205] After getting the response information, you can Figure 4a The remaining events in complete interference elimination.

[0206] In event 450, the first NR base station determines relevant information of the CRS and the subframe based on the response information, and generates interference cancellation information.

[0207] In event 460, the first NR base station sends interference cancellation information to the corresponding terminal through an RRC connection reconfiguration message based on the context information of the terminal regarding whether the terminal supports the CRS interference cancellation function.

[0208] For example, the RRC connection reconfiguration message includes a list of CRS interference configuration and subframe configuration information for each LTE cell. The configuration information of each LTE cell in the list includes LTE PCI information, CRS port type (such as single port, dual port and quad port), downlink frequency, downlink bandwidth, CRS pattern, MBSFN subframe configuration (optional), ABS subframe configuration (optional), and time deviation (optional).

[0209] In event 470, based on the interference cancellation information sent by the network side, the terminal performs CRS interference cancellation on non-MBSFN subframes, does not perform CRS interference cancellation on the neighboring cell for MBSFN subframes, and skips CRS interference cancellation for ABS subframes.

[0210] In the above embodiment, CRS interference from neighboring cells can be eliminated when LTE and NR are deployed adjacent to each other, thereby improving terminal throughput and improving user experience in LTE and NR coexistence scenarios.

[0211] It can reduce the interference from the LTE co-frequency cell when the terminal is in idle state and before random access is completed, and improve the reliability of data reception in the terminal in idle state. In addition, it can improve the MCS level of the terminal configuration SIB message and paging message, reduce the PRB overhead of the common channel, and improve the performance of the entire system.

[0212] It solves the problem that there is no direct connection interface between LTE and NR, which leads to the inability to interact with relevant information about CRS and subframes. It realizes the automatic interaction of parameter configuration information, reduces manual participation, and reduces operation and maintenance costs.

[0213] The technical solution disclosed in the present invention has little impact on the terminal, has good backward compatibility and deployment feasibility. Moreover, the technical solution disclosed in the present invention is an enhancement on the existing protocol, does not introduce a new protocol process, and has a low implementation difficulty.

[0214] Figure 5 Schematic diagrams showing some embodiments of the method for eliminating co-channel interference of the present disclosure.

[0215] like Figure 5 As shown, in a macro-micro networking scenario, the indoor micro base station adopts a 2.1GHz 20MHz bandwidth NR device gNB2, that is, the second NR base station in any of the above embodiments; the outdoor macro base station adopts a 2.1GHz LTE FDD base station eNB, that is, the LTE base station in any of the above embodiments, which has the same frequency and bandwidth as the indoor NR device; the outdoor base station also includes a 3.5GHz NR TDD base station gNB1, that is, the first NR base station in any of the above embodiments, and there is an Xn interface between this base station and the indoor base station.

[0216] In some embodiments, the configuration of the SIB1 broadcast message by the base station and the interference elimination method adopted by the terminal before completing the RRC establishment process may include the following steps.

[0217] eNB generates LTE CRS and subframe related information, and sends the LTE CRS and subframe related information to gNB2 due to the co-site deployment. gNB2 sends the LTE cell CRS and subframe related information to gNB1 as part of the LTE neighbor information through the NG-RAN Configuration Update Request message.

[0218] gNB1 determines the interference source from the LTE cell to which gNB1 is subjected based on the network management configuration or the stored measurement results of the different systems reported by multiple terminals. The determination method is to add the cells with interference higher than the preset threshold into the interference cell set. gNB1 generates interference cancellation configuration information based on the interference cell set and broadcasts it on the air interface through SIB1 message.

[0219] After the terminal receives the SIB1 message sent by gNB1, if it supports interference cancellation capability, it will perform CRS interference cancellation of LTE neighboring cells based on the auxiliary information on the network side when receiving random process downlink messages, receiving paging, and receiving other SIB broadcast messages except SIB1.

[0220] The terminal subtracts the CRS signals of all interfered cells from the received signal, and then completes the detection result of the RE after removing the CRS interference signal through MMSE.

[0221] In some embodiments, a method for eliminating interference performed by a network when a terminal is in a connected state may include the following steps.

[0222] The terminal carries the capability information of supporting CRS interference cancellation through the NAS information element in the RRC Setup Complete message. After receiving the NAS message sent by the terminal, the AMF entity sends the capability information to gNB1 through the Initial UE Context Setup message.

[0223] gNB1 saves the capability information and determines whether the terminal can configure the interference cancellation capability in the connected state based on whether the terminal supports CRS interference cancellation. gNB1 instructs the terminal to perform heterogeneous system measurements on the same-frequency LTE base station through RRC configuration. The terminal reports the set of interfering cells that meet the conditions to gNB1 based on the measurement configuration. gNB1 checks whether the cells in the interfering cell set have relevant information about CRS and subframes.

[0224] When the relay node is gNB2, the first request message is sent through the Xn interface message NG-RAN NODE CONFIGURATIONUPDATE.

[0225] When gNB2 receives the first request message, it determines the relevant information of the CRS and subframe of the eNB obtained by the internal interface, and sends a request content response message through the E-URAN neighbor cell configuration information in the Xn interface message NG-RAN NODE CONFIGURATION UPDATE RESPONSE.

[0226] After receiving the request content response message, gNB1 sends the CRS interference configuration message to the terminal through the RRC connection reconfiguration message according to the context of the terminal regarding whether the terminal supports the CRS interference elimination function.

[0227] Based on the network side configuration, the terminal performs CRS interference elimination for non-MBSFN subframes, does not perform CRS interference elimination for the neighboring cell for MBSFN subframes, and skips CRS interference elimination for ABS subframes.

[0228] Figure 6 A block diagram showing some embodiments of a new air interface base station of the present disclosure.

[0229] like Figure 6As shown, the new air interface base station 6 as the first NR base station includes: a receiving unit 61, used to receive CRS and subframe related information sent by the LTE base station through the relay node, and the LTE base station and the second NR base station are deployed at the same site; a processing unit 62, used to generate interference elimination information according to the relevant information; a sending unit 63, used to send the interference elimination information to the terminal side, so that the terminal that supports the interference elimination capability can eliminate the co-frequency interference of the LTE base station to the second NR base station according to the interference elimination information.

[0230] Figure 7 A block diagram showing some embodiments of the terminal of the present disclosure.

[0231] like Figure 7 As shown, the terminal 7 includes: a receiving unit 71, used to receive interference elimination information sent by the first NR base station, the interference elimination information is generated by the first NR base station according to the related information of CRS and subframes sent by the LTE base station through the relay node; a processing unit 72, used to eliminate the co-frequency interference of the LTE base station to the second NR base station according to the interference elimination information, and the LTE base station and the second NR base station are deployed at the same site.

[0232] In some embodiments, the terminal 7 also includes a sending unit 73, which is used to send the heterosystem measurement results to the first NR base station, so that the first NR base station can determine the cell interference source of the LTE base station on which the first NR base station is affected according to the heterosystem measurement results reported by the terminal configured by the network management or stored, and then determine the interference cell set according to the interference intensity of each cell interference source.

[0233] Figure 8 A block diagram showing some embodiments of the apparatus for eliminating co-channel interference of the present disclosure.

[0234] like Figure 8 As shown, the co-channel interference elimination device 8 of this embodiment includes: a memory 81 and a processor 82 coupled to the memory 81, and the processor 82 is configured to execute the co-channel interference elimination method in any embodiment of the present disclosure based on the instructions stored in the memory 81.

[0235] The memory 51 may include, for example, a system memory, a fixed non-volatile storage medium, etc. The system memory may store, for example, an operating system, an application program, a boot loader, a database, and other programs.

[0236] Fig. 9 A block diagram showing some other embodiments of the apparatus for eliminating co-channel interference of the present disclosure.

[0237] like Fig. 9As shown, the co-channel interference elimination device 9 of this embodiment includes: a memory 910 and a processor 920 coupled to the memory 910, and the processor 920 is configured to execute the co-channel interference elimination method in any of the aforementioned embodiments based on the instructions stored in the memory 910.

[0238] The memory 910 may include, for example, a system memory, a fixed non-volatile storage medium, etc. The system memory may store, for example, an operating system, an application program, a boot loader, and other programs.

[0239] The device for eliminating co-channel interference 9 may also include an input / output interface 930, a network interface 940, a storage interface 950, etc. These interfaces 930, 940, 950, the memory 910, and the processor 920 may be connected, for example, via a bus 960. The input / output interface 930 provides a connection interface for input / output devices such as a display, a mouse, a keyboard, a touch screen, a microphone, and a speaker. The network interface 940 provides a connection interface for various networked devices. The storage interface 950 provides a connection interface for external storage devices such as SD cards and USB flash drives.

[0240] Fig.10 A block diagram showing some embodiments of the co-channel interference elimination system of the present disclosure.

[0241] like Fig.10 As shown, the co-channel interference elimination system 10 includes: a new air interface base station 101, which serves as a first NR base station for executing the co-channel interference elimination method on the base station side in any of the above embodiments; a terminal 102, which is used to execute the co-channel interference elimination method on the terminal side in any of the above embodiments; a relay node 103, which is used to forward CRS and subframe related information sent by the LTE base station to the first NR base station, and the LTE base station is deployed at the same site as the second NR base station.

[0242] In some embodiments, the relay node 103 is an AMF entity, which sends request information for related information of CRS and subframe sent by the first NR base station to the corresponding MME entity. The MME entity generates request content information according to the identifier of the corresponding LTE base station and sends it to the corresponding LTE base station. The LTE base station generates response information according to the request content information and forwards it to the AMF entity. The AMF entity sends the response information to the first NR base station.

[0243] In some embodiments, the relay node 103 is a second NR base station, which determines the relevant information of the CRS and subframe of the corresponding LTE base station based on the request information of the relevant information of the CRS and subframe sent by the first NR base station, and sends the relevant information as response information to the first NR base station through the E-URAN neighbor cell configuration information in the radio access network node configuration update response (such as NG-RAN NODE CONFIGURATION UPDATE RESPONSE) in the Xn interface message.

[0244] Those skilled in the art will appreciate that the embodiments of the present disclosure may be provided as methods, systems, or computer program products. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present disclosure may take the form of a computer program product implemented on one or more computer-usable non-transient storage media including but not limited to disk storage, CD-ROM, optical storage, etc., which contain computer-usable program code.

[0245] So far, the method for eliminating co-channel interference, the device for eliminating co-channel interference, the system for eliminating co-channel interference, the new air interface base station, the terminal and the non-volatile computer-readable storage medium according to the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed herein.

[0246] The method and system of the present disclosure may be implemented in many ways. For example, the method and system of the present disclosure may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above order of steps for the method is for illustration only, and the steps of the method of the present disclosure are not limited to the order specifically described above, unless otherwise specifically stated. In addition, in some embodiments, the present disclosure may also be implemented as a program recorded in a recording medium, which includes machine-readable instructions for implementing the method according to the present disclosure. Therefore, the present disclosure also covers a recording medium storing a program for executing the method according to the present disclosure.

[0247] Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A method for eliminating co-channel interference, performed by a first new radio interface NR base station, include: The first NR base station receives a cell reference signal CRS and subframe related information sent by a long term evolution LTE base station through a relay node, and the LTE base station is co-deployed with the second NR base station; The first NR base station generates interference cancellation information according to the relevant information; The first NR base station sends the interference elimination information to the terminal side so that the terminal supporting the interference elimination capability eliminates the co-channel interference caused by the LTE base station to the second NR base station according to the interference elimination information.

2. The elimination method according to claim 1, in, The relevant information of the CRS and subframe is generated by the LTE base station and sent to the second NR base station deployed with it, and then sent to the first NR base station by the second NR base station serving as the relay node.

3. The elimination method according to claim 2, in, The relevant information of the CRS and subframe is sent by the second NR base station to the first NR base station as part of the LTE neighbor cell information through an interface establishment request message or a wireless access network configuration update request message.

4. The elimination method according to claim 1, in, The first NR base station generating interference cancellation information according to the relevant information includes: The first NR base station obtains an interference cell set determined according to the heterogeneous system measurement results of each terminal, where the interference strength of the cells in the interference cell set is greater than the interference threshold; The first NR base station generates the interference cancellation information based on the interfering cell set and the relevant information.

5. The elimination method according to claim 4, in, The first NR base station obtains the interference cell set determined according to the heterogeneous system measurement results of each terminal, including: The first NR base station determines, according to network management configuration or stored heterogeneous system measurement results reported by multiple terminals, a cell interference source of the LTE base station suffered by the first NR base station; The interfering cell set is determined according to the interference intensity of the interference source of each cell.

6. The elimination method according to claim 4, in, The first NR base station obtains the interference cell set determined according to the heterogeneous system measurement results of each terminal, including: The first NR base station instructs each terminal to perform heterosystem measurements on each co-deployed LTE base station, so that each terminal reports the interfering cell set determined according to the heterosystem measurement results.

7. The elimination method according to claim 6, in, The first NR base station instructing each terminal to perform heterogeneous system measurement on the co-deployed LTE base station includes: In the case where the terminal supports the measurement of the system frame number and the frame timing difference SFTD, the terminal is instructed to perform SFTD measurement on at least one LTE cell in the interfering cell set to obtain the timing deviations of these LTE cells.

8. The elimination method according to claim 1, in, The first NR base station sending the interference cancellation information to the terminal side includes: The first NR base station broadcasts the interference elimination information through the system information block SIB1, so that the terminal supporting the interference elimination capability eliminates the CRS interference in the received information according to the interference elimination information, and the received information includes at least one of random process downlink information, paging, and other broadcast information other than the SIB1.

9. The elimination method according to claim 1, in, The information related to the CRS and subframe received by the first NR base station from the LTE base station through the relay node includes: The first NR base station instructs each terminal to perform inter-system measurement on each co-deployed LTE base station; The first NR base station sends request information for related information of the CRS and subframe to the relay node of the corresponding LTE base station according to the inter-system measurement results of each terminal; The first NR base station obtains relevant information of the CRS and subframe according to the response information of the relay node.

10. The elimination method according to claim 9, in, The request information for sending CRS and subframe related information to the relay node of the corresponding LTE base station includes: The first NR base station determines, according to the network management configuration information, a connection mode of the corresponding LTE base station; According to the connection mode, the relay node and its corresponding request information are determined.

11. The elimination method according to claim 9, in, The request information for sending CRS and subframe related information to the relay node of the corresponding LTE base station includes: In the case where the relay node is an authentication management function AMF entity, the request information is sent to the AMF entity via a cross-core network message.

12. The elimination method according to claim 11, in, The request information sent to the AMF entity includes the base station identifier of the corresponding LTE base station, the tracking area code TAC information of the corresponding LTE base station, the base station identifier of the first NR base station, the TAC information supported by the first NR base station and the requested cell list. Each cell information in the requested cell list includes at least one of the requested CRS configuration information and subframe configuration information, and the corresponding LTE cell identifier.

13. The elimination method according to claim 9, in, The request information for sending CRS and subframe related information to the relay node of the corresponding LTE base station includes: In the case where the relay node is an authentication management function AMF entity, the first NR base station generates corresponding request information and sends it to the AMF entity, so that the AMF entity sends the response information to the first NR base station.

14. The elimination method according to claim 13, in, The request information includes a base station identifier of the first NR base station, TAC information of the first NR base station, and specific request content. The response information includes the base station identifier of the corresponding LTE base station, the TAC information of the corresponding LTE base station, the base station identifier of the first NR base station, the TAC information supported by the first NR base station, and the configuration message corresponding to the request.

15. The elimination method according to claim 9, in, The request information for sending CRS and subframe related information to the relay node of the corresponding LTE base station includes: In the case where the relay node is the second NR base station, the request information is sent to the second NR base station via a wireless access network node configuration update message in an Xn interface message.

16. The elimination method according to claim 15, in, The request message sent to the second NR base station includes a requested cell list, and each cell information in the requested cell list includes at least one of the requested CRS configuration information, subframe configuration information, and the corresponding LTE cell identifier.

17. The elimination method according to claim 9, in, The request information for sending CRS and subframe related information to the relay node of the corresponding LTE base station includes: In the case where the relay node is the second NR base station, the first NR base station will generate corresponding request information and send it to the second NR base station, so that the second NR base station will send the relevant information to the first NR base station as the response information.

18. The elimination method according to claim 9, further comprising: include: The first NR base station receives and stores the interference cancellation support capability information sent by the terminal through the AMF entity; in, The first NR base station sending the interference cancellation information to the terminal side includes: The first NR base station sends the interference cancellation information to the terminal supporting the interference cancellation capability through the radio resource control RRC connection reconfiguration message based on the stored capability information.

19. The elimination method according to claim 18, in, The RRC connection reconfiguration message includes LTE physical cell identifier PCI information, CRS port type, downlink frequency, downlink bandwidth, and CRS pattern. The RRC connection reconfiguration message further includes at least one of a multicast or groupcast single frequency network MBSFN subframe configuration, an all-empty subframe ABS subframe configuration, and a time offset.

20. The elimination method according to any one of claims 1 to 19, in, The CRS and subframe related information includes LTE PCI information, LTE cell identifier, CRS port type, downlink frequency, downlink bandwidth, CRS pattern, and at least one of MBSFN subframe configuration, ABS subframe configuration, and time deviation. The interference cancellation information includes an interference cancellation activation indication and an interference cell set configuration list. The configuration information of each cell in the interference cell set configuration list includes the cell's PCI, downlink frequency, downlink bandwidth, CRS pattern, and at least one of a positioning reference, MBSFN subframe configuration, and ABS subframe configuration.

21. The elimination method according to any one of claims 1 to 19, further comprising: include: When the terminal does not support interference cancellation capability but supports dynamic spectrum sharing DSS capability, the first NR base station determines the LTE cell with the strongest interference according to the capability of the terminal, the CRS and relevant information of the subframe, where the relevant information includes the CRS pattern, downlink frequency, downlink bandwidth, and MBSFN subframe configuration; The first NR base station performs resource block RB-level rate configuration for the LTE cell for the terminal to eliminate co-channel interference for the terminal.

22. A method for eliminating co-channel interference, performed by a terminal, include: The terminal receives interference cancellation information sent by a first new radio interface NR base station, where the interference cancellation information is generated by the first NR base station according to relevant information of a cell reference signal CRS and a subframe received by a long term evolution LTE base station through a relay node; The terminal eliminates the co-frequency interference of the LTE base station to the second NR base station according to the interference elimination information, and the LTE base station and the second NR base station are deployed at the same site.

23. The elimination method according to claim 22, further comprising: include: The terminal performs heterogeneous system measurement on each co-deployed LTE base station to determine an interference cell set, wherein the interference intensity of cells in the interference cell set is greater than an interference threshold; in, The interference elimination information is generated by the first NR base station based on the interference cell set and the related information.

24. The elimination method according to claim 23, further comprising: include: The terminal sends the heterosystem measurement result to the first NR base station, so that the first NR base station determines the cell interference source of the LTE base station suffered by the first NR base station according to the heterosystem measurement result reported by the terminal configured or stored by the network management, and then determines the interference cell set according to the interference intensity of each cell interference source.

25. The elimination method according to claim 23, further comprising: include: According to the instruction of the first NR base station, the terminal performs inter-system measurement on each co-deployed LTE base station; The terminal determines the interference cell set according to the heterogeneous system measurement result; The terminal sends the interfering cell set to the first NR base station.

26. The elimination method according to claim 25, in, The terminal performs heterogeneous system measurement on each co-deployed LTE base station, including: When supporting the measurement of system frame number and frame timing difference SFTD, according to the instruction of the first NR base station, the terminal performs SFTD measurement on at least one LTE cell in the interfering cell set to obtain and report the timing deviation of these LTE cells to the first NR base station.

27. The elimination method according to claim 22, in, The terminal receiving interference cancellation information sent by the first new radio interface NR base station includes: The terminal receives the interference cancellation information broadcast by the first NR base station through the system information block SIB1; Eliminating, by the terminal according to the interference elimination information, the co-channel interference of the LTE base station to the second NR base station includes: The terminal eliminates CRS interference in received information according to the interference elimination information, where the received information includes at least one of random process downlink information, paging, and other broadcast information other than the SIB1.

28. The elimination method according to claim 22, in, Eliminating, by the terminal according to the interference elimination information, the co-channel interference of the LTE base station to the second NR base station includes: The terminal determines, according to the interference cancellation information, an original transmission signal of each CRS on a resource element RE symbol; The terminal restores the CRS signal of each interfering cell according to the channel estimation result of each original transmitted signal; The terminal eliminates the CRS signal of the corresponding interfering cell from the received signal.

29. The elimination method according to claim 28, in, The terminal restoring the CRS signal of each interfering cell according to the channel estimation result of each original transmitted signal includes: The terminal performs channel estimation on each antenna and determines a covariance matrix of each channel estimation result; The terminal determines each receiving matrix according to each channel estimation result and its covariance matrix; The terminal restores the CRS signal of each interfering cell according to the receiving matrixes.

30. The elimination method according to claim 22, further comprising: include: According to the instruction of the first NR base station, the terminal performs inter-system measurement on each co-deployed LTE base station; The terminal sends the heterosystem measurement result to the first NR base station, so that the first NR base station sends request information for related information of CRS and subframe to the relay node of the corresponding LTE base station according to the heterosystem measurement result, and obtains the related information of CRS and subframe according to the response information of the relay node.

31. The elimination method according to claim 22, further comprising: include: The terminal sends capability information supporting interference cancellation to the first NR base station through the AMF entity; in, The terminal receiving interference cancellation information sent by the first new radio interface NR base station includes: The terminal receives the interference cancellation information sent by the first NR base station through the radio resource control RRC connection reconfiguration message based on the stored capability information.

32. The elimination method according to claim 30, in, Eliminating, by the terminal according to the interference elimination information, the co-channel interference of the LTE base station to the second NR base station includes: When the received signal is not a multicast or groupcast single frequency network MBSFN subframe, the terminal performs CRS interference elimination according to the interference elimination information; When the received signal is an MBSFN subframe, the terminal does not perform CRS interference elimination on the neighboring cell; In the case where the received signal is a fully blank subframe ABS, the terminal skips the CRS interference cancellation process of the ABS.

33. A new air interface base station, include: A receiving unit, configured to receive a cell reference signal CRS and subframe related information sent by a long term evolution LTE base station through a relay node, wherein the LTE base station is co-deployed with a second NR base station; A processing unit, configured to generate interference cancellation information according to the relevant information; A sending unit is used to send the interference elimination information to the terminal side, so that the terminal supporting the interference elimination capability eliminates the co-channel interference of the LTE base station to the second NR base station according to the interference elimination information.

34. A terminal, include: A receiving unit, configured to receive interference cancellation information sent by a first new radio interface NR base station, where the interference cancellation information is generated by the first NR base station according to relevant information of a cell reference signal CRS and a subframe sent by a long term evolution LTE base station through a relay node; A processing unit is used to eliminate the co-frequency interference of the LTE base station to the second NR base station according to the interference elimination information, and the LTE base station and the second NR base station are deployed at the same site.

35. A system for eliminating co-channel interference. include: A new air interface base station, as a first new air interface NR base station, is used to perform the method for eliminating co-channel interference according to any one of claims 1 to 21; A terminal, configured to execute the method for eliminating co-channel interference as described in any one of claims 22 to 32; The relay node is used to forward the cell reference signal CRS and subframe related information sent by the long-term evolution LTE base station to the first NR base station, and the LTE base station is co-deployed with the second NR base station.

36. The elimination system according to claim 35, in, The relay node is an authentication management function AMF entity, which sends the request information of the CRS and subframe related information sent by the first NR base station to the corresponding mobility management MME entity. The MME entity generates the request content information according to the identifier of the corresponding LTE base station and sends it to the corresponding LTE base station. The LTE base station generates response information according to the request content information and forwards it to the AMF entity. The AMF entity sends the response information to the first NR base station.

37. The elimination system according to claim 35, in, The relay node is the second NR base station. It determines the relevant information of the CRS and subframe of the corresponding LTE base station according to the request information of the relevant information of the CRS and subframe sent by the first NR base station, and sends the relevant information as response information to the first NR base station through the evolved universal mobile communications system terrestrial radio access network E-URAN neighbor cell configuration information in the radio access network node configuration update response in the Xn interface message.

38. A device for eliminating co-frequency interference, include: Memory; and A processor coupled to the memory, wherein the processor is configured to execute the method for eliminating co-channel interference according to any one of claims 1 to 21 based on instructions stored in the memory.

39. A device for eliminating co-frequency interference, include: Memory; and A processor coupled to the memory, wherein the processor is configured to execute the method for eliminating co-channel interference as described in any one of claims 22-32 based on instructions stored in the memory.

40. A non-volatile computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for eliminating co-channel interference as described in any one of claims 1-21, or the method for eliminating co-channel interference as described in any one of claims 22-32.

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