CN114599049A

CN114599049A - Method, device and system for eliminating same frequency interference, new air interface base station and terminal

Info

Publication number: CN114599049A
Application number: CN202011415057.XA
Authority: CN
Inventors: 许森; 袁晶晶; 宋谱; 张乐; 孙震强
Original assignee: China Telecom Corp Ltd
Current assignee: China Telecom Corp Ltd
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2022-06-07

Abstract

The disclosure relates to a method, a device and a system for eliminating co-channel interference, a new air interface base station and a terminal, and relates to the technical field of communication. The elimination method comprises the following steps: the method comprises the steps that 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 and a second NR base station are deployed in a co-station mode; the first NR base station generates interference elimination information according to the relevant information; and the first NR base station transmits 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

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

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a method and an apparatus 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

In the 5G network deployment process, the low-frequency LTE (Long Term Evolution) spectrum needs to consider the re-cultivation to NR (New Radio).

However, much of the LTE spectrum is still currently used to carry data traffic, and the network load is relatively heavy, which makes the implementation of heavy plowing difficult. For example, there is a scenario where LTE and NR use the same frequency point for adjacent deployment, that is, NR is deployed in a deployment area without LTE-related frequency points and uses the same frequency point as LTE.

In the design process of the NR system, a pilot signal similar to CRS and transmitted for a long time is not adopted, and a CSI-RS signal with a longer transmission time is adopted. Therefore, the neighbor cell interference of NR is relatively small.

However, the current test results show that the interference of CRS of LTE to NR system is very large, and NR system has no corresponding CRS cancellation mechanism in the current specification.

In addition, in the current Xn Setup procedure and the gNB Configuration Update procedure, the neighboring Cell relation of the E-UTRAN (Evolved Universal Mobile Telecommunications System Terrestrial Radio Access Network) does not include any Configuration information about the CRS (Cell Reference Signal).

In the related art, the LTE system introduces a plurality of methods for eliminating the CRS of neighboring cells from Rel-11, and the basic methods include the following: interference elimination based on reducing transmission power or reducing transmission, such as in the mode of ABS (all Blank Subframe) in elcic (Enhanced Inter Cell Interference Coordination) of Rel-11; interference elimination by adopting an advanced receiver can be realized based on MMSE-IRC (Minimum Mean square Error-Interference Combining) detection, such as NACIS (Network Interference Cancellation and Suppression) technology introduced for LTE in Rel-14 and Rel-15; and an interference elimination mode based on the synchronization information.

Disclosure of Invention

The inventors of the present disclosure found that the following problems exist in the above-described related art: an interface and an information acquisition means are lacked between the LTE base station and the NR base station, so that CRS and subframe related information are lacked in NR interacted adjacent region information, and the terminal cannot acquire interference elimination information to eliminate co-channel interference of LTE and NR.

In view of this, the present disclosure provides a co-channel interference cancellation technical solution, which can cancel co-channel interference of LTE and NR.

According to some embodiments of the present disclosure, there is provided a method for eliminating co-channel interference, performed by a first NR base station, including: the method comprises the steps that 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 and a second NR base station are deployed in a co-station mode; the first NR base station generates interference elimination information according to the relevant information; and the first NR base station transmits 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.

In some embodiments, the CRS and the subframe related information are generated by the LTE base station and then transmitted to the second NR base station deployed in a co-site with the LTE base station, and then transmitted to the first NR base station by the second NR base station serving as a relay node.

In some embodiments, the CRS and subframe related information is sent by the second NR base station as part of the LTE neighbor information to the first NR base station via an interface Setup Request (e.g., an Xn Setup Request) or a radio access network Configuration Update Request (e.g., an NG-RAN Configuration Update Request) message.

In some embodiments, the first NR base station generating the interference cancellation information according to the correlation information comprises: the method comprises the steps that a first NR base station obtains an interference cell set determined according to different system measurement results of terminals, and the interference strength of cells in the interference cell set is larger than an interference threshold; and the first NR base station generates interference elimination information according to the interference cell set and the related information.

In some embodiments, the obtaining, by the first NR base station, the set of interfering cells determined according to the inter-system measurement result of each terminal includes: the first NR base station determines a cell interference source of the LTE base station to which the first NR base station is subjected according to inter-system measurement results reported by a plurality of terminals configured or stored by a network manager; and determining an interference cell set according to the interference strength of the interference source of each cell.

In some embodiments, the obtaining, by the first NR base station, the set of interfering cells determined according to the inter-system measurement result of each terminal includes: and the first NR base station instructs each terminal to perform inter-system measurement on the LTE base station deployed by each co-station so that each terminal reports an interference cell set determined according to the inter-system measurement result.

In some embodiments, the instructing, by the first NR base station, each terminal to perform inter-system measurement on the co-sited LTE base station includes: when a terminal supports SFTD (SFN and Frame boundary Timing Difference) measurement, the terminal is instructed to perform SFTD measurement on at least one LTE cell in an interference cell set so as to acquire the Timing deviation of the LTE cells.

In some embodiments, the first NR base station transmitting the interference cancellation information to the terminal side includes: the first NR base station broadcasts interference cancellation Information through SIB1(System Information Type 1), so that a terminal supporting interference cancellation capability cancels CRS interference in received Information according to the interference cancellation Information, where the received Information includes at least one of random procedure downlink Information, paging, and other broadcast Information except SIB 1.

In some embodiments, a terminal supporting interference cancellation capability cancels co-channel interference by: determining an original transmission signal of each CRS on RE (Resource Element) symbols according to the interference elimination information; reducing CRS signals of each interference cell according to the channel estimation result of each original transmission signal; and eliminating CRS signals of corresponding interference cells from the received signals.

In some embodiments, a terminal supporting interference cancellation capability restores CRS signals of each interfering cell by: performing channel estimation on each antenna of the terminal, and determining a covariance matrix of each channel estimation result; determining each receiving matrix according to each channel estimation result and the covariance matrix thereof; and restoring the CRS signals of the interference cells according to the receiving matrixes.

In some embodiments, the first NR base station receiving information on a cell reference signal CRS and a subframe transmitted by the LTE base station through the relay node includes: the first NR base station indicates each terminal to perform inter-system measurement on LTE base stations deployed in the same station; the first NR base station sends request information of CRS and related information of subframes to a relay node of a corresponding LTE base station according to the inter-system measurement result of each terminal; and the first NR base station acquires the CRS and the related information of the subframe according to the response information of the relay node.

In some embodiments, the sending request information for CRS and subframe related information to the relay node of the respective LTE base station includes: the first NR base station determines the connection mode of the corresponding LTE base station according to the network management configuration information; and determining the relay node and corresponding request information thereof according to the connection mode.

In some embodiments, the sending request information for CRS and subframe related information to the relay node of the respective LTE base station includes: in the case where the relay node is an AMF (Authentication Management Function) entity, the request message is sent to the AMF entity by a cross-core network message.

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

In some embodiments, the sending request information for CRS and subframe related information to the relay node of the respective LTE base station includes: under the condition that the relay node is an Authentication Management Function (AMF) entity, the first NR base station generates corresponding request information and sends the request information to the AMF entity; the response information is obtained by the following steps: the AMF entity sends the request information to a corresponding mobility management MME entity; the MME entity generates request content information according to the identification of the corresponding LTE base station and sends the request content information to the corresponding LTE base station; the LTE base station generates response information according to the request content information and forwards the response information to the AMF entity; and the AMF entity sends the response information to the first NR base station.

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

In some embodiments, the sending request information for CRS and subframe related information to the relay node of the respective LTE base station includes: in the case where the relay NODE is the second NR base station, the request message is sent to the second NR base station through a radio access network NODE CONFIGURATION UPDATE (e.g., NG-RAN NODE CONFIGURATION UPDATE) message in the Xn interface message.

In some embodiments, the request message sent to the second NR base station comprises a request cell list, each cell information in the request cell list comprising at least one of requested CRS configuration information, subframe configuration information, and a corresponding LTE cell identity.

In some embodiments, transmitting the request information for the CRS and the related information of the subframe to the relay node of the respective LTE base station comprises: under the condition that the relay node is a second NR base station, the first NR base station sends the generated corresponding request information to the second NR base station; the response information is obtained by the following steps: the second NR base station determines CRS of the corresponding LTE base station and related information of the subframe according to the request information; the second NR base station transmits the relevant information as RESPONSE information to the first NR base station through E-URAN neighbor CONFIGURATION information in a radio access network NODE CONFIGURATION UPDATE RESPONSE (NG-RAN NODE CONFIGURATION UPDATE RESPONSE) in the Xn interface message.

In some embodiments, the cancellation method further comprises: a first NR base station receives and stores the capability information supporting interference elimination sent by a terminal through an AMF entity; wherein the first NR base station transmitting the interference cancellation information to the terminal side includes: and the first NR base station transmits the interference elimination information to a terminal supporting the interference elimination capability through an RRC (Radio Resource Control) connection reconfiguration message according to the stored capability information.

In some embodiments, the RRC connection reconfiguration message includes PCI (Physical Cell ID) information of LTE, CRS port type, downlink frequency point, downlink bandwidth, CRS pattern, and further includes at least one of MBSFN subframe configuration of multicast/multicast single frequency network, ABS subframe configuration of all-blank subframe, and time offset.

In some embodiments, a terminal supporting interference cancellation capability cancels co-channel interference by: under the condition that the received signal is not an MBSFN subframe, the terminal carries out CRS interference elimination according to the interference elimination information; under the condition that the received signal is an MBSFN subframe, the terminal does not perform CRS interference elimination on the adjacent cell; and under the condition that the received signal is an ABS subframe, the terminal skips CRS interference elimination processing of the ABS subframe.

In some embodiments, the CRS and subframe related information includes LTE PCI information, LTE cell identifier, CRS port type, downlink frequency point, downlink bandwidth, CRS pattern, and at least one of MBSFN subframe configuration, ABS subframe configuration, and time offset, the interference cancellation information includes an interference cancellation on indication, an interfering cell set configuration list, and each cell configuration information in the interfering cell set configuration list includes PCI, downlink frequency point, downlink bandwidth, CRS pattern of a cell, and also includes at least one of a positioning reference, MBSFN subframe configuration, and ABS subframe configuration.

In some embodiments, the cancellation method further comprises: under the condition that the terminal does not support the interference elimination capability but supports the DSS (Dynamic Spectrum Sharing), the first NR base station determines an LTE cell with the strongest interference according to the capability of the terminal, CRS and related information of subframes, wherein the related information comprises CRS patterns, downlink frequency points, downlink bandwidth and MBSFN subframe configuration; and the first NR base station performs RB (Resource Block) level rate configuration on the LTE cell aiming at the terminal, and eliminates co-channel interference for the terminal.

According to other embodiments of the present disclosure, a method for eliminating co-channel interference is provided, which is performed by a terminal, and includes: the terminal receives interference elimination information sent by the first NR base station, wherein the interference elimination information is generated by the first NR base station according to the received CRS sent by the LTE base station through the relay node and the relevant information of the subframe; and the terminal eliminates the co-channel interference of the LTE base station on the second NR base station according to the interference elimination information, and the LTE base station and the second NR base station are deployed in a co-station mode.

In some embodiments, the cancellation method further comprises: the method comprises the steps that a terminal carries out inter-system measurement on LTE base stations deployed in common stations and is used for determining an interference cell set, wherein the interference strength of cells in the interference cell set is greater than an interference threshold value; the interference elimination information is generated by the first NR base station according to the interference cell set and the related information.

In some embodiments, the cancellation method further comprises: the terminal sends the inter-system measurement result to the first NR base station, so that the first NR base station determines a cell interference source of the LTE base station to which the first NR base station is subjected according to the inter-system measurement result configured by a network manager or reported by the terminal, and determines an interference cell set according to the interference strength of each cell interference source.

In some embodiments, the cancellation method further comprises: according to the indication of the first NR base station, the terminal performs inter-system measurement on LTE base stations deployed by the common stations; the terminal determines an interference cell set according to the measurement result of the different systems; the terminal transmits a set of interfering cells to the first NR base station.

In some embodiments, the performing, by the terminal, inter-system measurements on the LTE base stations deployed by the co-station includes: and under the condition of supporting the SFTD measurement, the terminal performs the SFTD measurement on at least one LTE cell in the interference cell set according to the indication of the first NR base station so as to acquire and report the timing deviation of the LTE cells to the first NR base station.

In some embodiments, the receiving, by the terminal, the interference cancellation information transmitted by the first NR base station includes: the terminal receives the interference elimination information broadcast by the first NR base station through SIB 1; the terminal eliminates the co-channel interference of the LTE base station to the second NR base station according to the interference elimination information, and the method comprises the following steps: and the terminal eliminates CRS interference in the received information according to the interference elimination information, wherein the received information comprises at least one item of downlink information in a random process, paging and other broadcast information except SIB 1.

In some embodiments, the terminal eliminating co-channel interference of the LTE base station to the second NR base station according to the interference elimination information includes: 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 CRS signals of each interference cell according to the channel estimation result of each original transmission signal; and the terminal eliminates the CRS signals of the corresponding interference cells from the received signals.

In some embodiments, the restoring, by the terminal, the CRS signals of each interfering cell according to the channel estimation result of each original transmission signal includes: the terminal carries out channel estimation on each antenna of the terminal and determines a covariance matrix of each channel estimation result; the terminal determines each receiving matrix according to each channel estimation result and the covariance matrix thereof; and the terminal restores the CRS signals of the interference cells according to the receiving matrixes.

In some embodiments, the cancellation method further comprises: according to the indication of the first NR base station, the terminal performs inter-system measurement on LTE base stations deployed by the common stations; the terminal sends the inter-system measurement result to the first NR base station, so that the first NR base station sends request information of CRS and related information of the sub-frame to a relay node of the corresponding LTE base station according to the inter-system measurement result, and acquires the related information of the CRS and the sub-frame according to response information of the relay node.

In some embodiments, the cancellation method further comprises: the terminal sends the capability information supporting interference elimination to the first NR base station through the AMF entity; the receiving, by the terminal, the interference cancellation information sent by the first new air interface NR base station includes: and the terminal receives the interference elimination information sent by the first NR base station through the RRC connection reconfiguration message according to the stored capability information.

In some embodiments, the terminal eliminating co-channel interference of the LTE base station to the second NR base station according to the interference elimination information includes: under the condition that the received signal is not an MBSFN subframe, the terminal carries out CRS interference elimination according to the interference elimination information; under the condition that the received signal is an MBSFN subframe, the terminal does not perform CRS interference elimination on the adjacent cell; and under the condition that the received signal is an ABS subframe, the terminal skips CRS interference elimination processing of the ABS subframe.

According to still other embodiments of the present disclosure, there is provided a new air interface base station, where the new air interface base station as a first NR base station includes: the receiving unit is used for receiving cell reference signals CRS and related information of subframes sent by an LTE base station through a relay node, and the LTE base station and a second NR base station are deployed in a co-station mode; a processing unit, configured to generate interference cancellation information according to the relevant information; and the sending unit is used for sending 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.

In some embodiments, the CRS and subframe related information is sent by the second NR base station to the first NR base station as part of the LTE neighbor information via an interface Setup Request (Xn Setup Request) or a radio access network Configuration Update Request (NG-RAN Configuration Update Request) message.

In some embodiments, the processing unit obtains an interference cell set determined according to inter-system measurement results of each terminal, and interference strength of cells in the interference cell set is greater than an interference threshold; and generating interference elimination information according to the interference cell set and the related information.

In some embodiments, the processing unit determines a cell interference source of the LTE base station to which the first NR base station is subjected according to inter-system measurement results reported by a plurality of terminals configured or stored by a network manager; and determining an interference cell set according to the interference strength of the interference source of each cell.

In some embodiments, the processing unit instructs each terminal to perform inter-system measurement on the LTE base station deployed by each co-station, so that each terminal reports an interfering cell set determined according to inter-system measurement results.

In some embodiments, in case the terminal supports SFTD measurements, the processing unit instructs the terminal to make SFTD measurements on at least one LTE cell of the set of interfering cells to obtain timing offsets of the LTE cells.

In some embodiments, the transmitting unit broadcasts interference cancellation information through a system information block SIB1, so that a terminal supporting interference cancellation capability cancels CRS interference in reception information according to the interference cancellation information, wherein the reception information includes at least one of random procedure downlink information, paging, and other broadcast information except SIB 1.

In some embodiments, a terminal supporting interference cancellation capability cancels co-channel interference by: according to the interference elimination information, determining an original transmission signal of each CRS on a resource element RE symbol; reducing CRS signals of each interference cell according to the channel estimation result of each original transmission signal; and eliminating CRS signals of corresponding interference cells from the received signals.

In some embodiments, a terminal supporting interference cancellation capability restores CRS signals of interfering cells by: performing channel estimation on each antenna of the terminal, and determining a covariance matrix of each channel estimation result; determining each receiving matrix according to each channel estimation result and the covariance matrix thereof; and restoring the CRS signals of the interference cells according to the receiving matrixes.

In some embodiments, the processing unit instructs each terminal to perform inter-system measurement on the LTE base stations deployed in each co-station; the sending unit sends request information of CRS and related information of subframes to relay nodes of corresponding LTE base stations according to the inter-system measurement results of each terminal; and the processing unit acquires the CRS and the related information of the subframe according to the response information of the relay node.

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

In some embodiments, the transmitting unit transmits the request message to the AMF entity through a cross-core network message in case that the relay node is the AMF entity.

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

In some embodiments, in the case that the relay node is an AMF entity, the transmitting unit transmits the generated corresponding request information to the AMF entity; the response information is obtained by the following steps: the AMF entity sends the request information to a corresponding MME entity; the MME entity generates request content information according to the identification of the corresponding LTE base station and sends the request content information to the corresponding LTE base station; the LTE base station generates response information according to the request content information and forwards the response information to the AMF entity; and the AMF entity transmits the response information to the first NR base station.

In some embodiments, in the case where the relay NODE is the second NR base station, the transmitting unit transmits the request message to the second NR base station through a radio access network NODE CONFIGURATION UPDATE message (e.g., NG-RAN NODE CONFIGURATION UPDATE) in the Xn interface message.

In some embodiments, in the case that the relay node is a second NR base station, the transmitting unit transmits the generation corresponding request information to the second NR base station; the response information is obtained by the following steps: the second NR base station determines CRS of the corresponding LTE base station and related information of the subframe according to the request information; the second NR base station transmits the relevant information as RESPONSE information to the first NR base station through E-URAN neighbor CONFIGURATION information in a radio access network NODE CONFIGURATION UPDATE RESPONSE (e.g., NG-RAN NODE CONFIGURATION UPDATE RESPONSE) in the Xn interface message.

In some embodiments, the receiving unit receives and stores the capability information supporting interference cancellation sent by the terminal through the AMF entity; and the sending unit sends the interference elimination information to the terminal supporting the interference elimination capability through the radio resource control RRC connection reconfiguration message according to the stored capability information.

In some embodiments, the RRC connection reconfiguration message includes PCI information of LTE, CRS port type, downlink frequency point, downlink bandwidth, CRS pattern, and further includes at least one of multicast/multicast single frequency network MBSFN subframe configuration, all-blank subframe ABS subframe configuration, and time offset.

In some embodiments, a terminal supporting interference cancellation capability cancels co-channel interference by: under the condition that the received signal is not an MBSFN subframe, the terminal carries out CRS interference elimination according to the interference elimination information; under the condition that a received signal is an MBSFN subframe, the terminal does not perform CRS interference elimination on an adjacent cell; and under the condition that the received signal is an ABS subframe, the terminal skips CRS interference elimination processing of the ABS subframe.

In some embodiments, when a terminal does not support interference cancellation capability but supports DSS capability, a processing unit determines an LTE cell with the strongest interference according to the capability of the terminal, and related information of CRS and subframes, where the related information includes a CRS pattern, a downlink frequency point, a downlink bandwidth, and an MBSFN subframe configuration, and the processing unit performs RB-level rate configuration on the LTE cell for the terminal to cancel co-channel interference for the terminal.

According to still further embodiments of the present disclosure, there is provided a terminal including: the receiving unit is used for receiving interference elimination information sent by the first NR base station, wherein the interference elimination information is generated by the first NR base station according to the received CRS sent by the LTE base station through the relay node and the relevant information of the subframe; and the processing unit is used for eliminating the co-channel 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 in a co-station mode.

In some embodiments, the processing unit performs inter-system measurement on LTE base stations deployed by each co-station, and is configured to determine an interfering cell set, where interference strength of cells in the interfering cell set is greater than an interference threshold, and the interference cancellation information is generated by the first NR base station according to the interfering cell set and related information.

In some embodiments, the terminal further includes a sending unit, configured to send the inter-system measurement result to the first NR base station, so that the first NR base station determines, according to the inter-system measurement result configured by the network manager or reported by the terminal, a cell interference source of the LTE base station that is received by the first NR base station, and then determines, according to an interference strength of each cell interference source, an interference cell set.

In some embodiments, the processing unit performs inter-system measurement on LTE base stations deployed by each co-station according to the indication of the first NR base station; determining an interference cell set according to the measurement result of the different systems; the transmission unit transmits the set of interfering cells to the first NR base station.

In some embodiments, in case of supporting the SFTD measurement, according to the indication of the first NR base station, the processing unit performs the SFTD measurement on at least one LTE cell in the interfering cell set to obtain and report the timing offset of the LTE cells to the first NR base station.

In some embodiments, the receiving unit receives interference cancellation information broadcast by the first NR base station through SIB 1; the processing unit eliminates CRS interference in the received information according to the interference elimination information, wherein the received information comprises at least one item of random process downlink information, paging and other broadcast information except SIB 1.

In some embodiments, the processing unit determines an original transmission signal of each CRS on the RE symbol according to the interference cancellation information; the processing unit restores CRS signals of each interference cell according to the channel estimation result of each original transmission signal; the processing unit eliminates CRS signals of corresponding interference cells from the received signals.

In some embodiments, the processing unit performs channel estimation on each antenna thereof and determines a covariance matrix of each channel estimation result; the processing unit determines each receiving matrix according to each channel estimation result and the covariance matrix thereof; and the processing unit restores the CRS signals of the interference cells according to the receiving matrixes.

In some embodiments, according to the indication of the first NR base station, the processing unit performs inter-system measurement on LTE base stations deployed by the co-stations; the sending unit sends the inter-system measurement result to the first NR base station, so that the first NR base station sends request information of CRS and related information of subframes to a relay node of a corresponding LTE base station according to the inter-system measurement result, and obtains the related information of the CRS and the subframes according to response information of the relay node.

In some embodiments, the transmitting unit transmits capability information supporting interference cancellation to the first NR base station through the AMF entity; and the receiving unit receives the interference elimination information sent by the first NR base station through the RRC connection reconfiguration message according to the stored capability information.

In some embodiments, in the case that the received signal is not an MBSFN subframe, the processing unit performs CRS interference cancellation according to the interference cancellation information; when the received signal is an MBSFN subframe, the processing unit does not perform CRS interference elimination on the adjacent cell; when the received signal is an ABS subframe, the processing unit skips CRS interference cancellation processing of the ABS subframe.

According to still other embodiments of the present disclosure, there is provided a system for eliminating co-channel interference, including: a new air interface base station, as a first NR base station, configured to perform the method for eliminating co-channel interference at the base station side in any of the embodiments; a terminal, configured to execute the method for eliminating co-channel interference at the terminal side in any of the embodiments; and the relay node is used for forwarding the CRS and the related information of the subframe transmitted by the LTE base station to the first NR base station, and the LTE base station and the second NR base station are deployed in a co-station mode.

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

In some embodiments, the relay NODE is the second NR base station, determines the CRS of the LTE base station and the relevant information of the subframe according to the request information of the CRS and the relevant information of the 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 neighboring cell CONFIGURATION information in the radio access network NODE CONFIGURATION UPDATE RESPONSE (e.g., NG-RAN NODE CONFIGURATION UPDATE RESPONSE) in the Xn interface message.

According to still other embodiments of the present disclosure, there is provided an apparatus for eliminating co-channel interference, including: a memory; and a processor coupled to the memory, the processor configured to execute the method for eliminating co-channel interference in any of the above embodiments based on instructions stored in the memory device.

According to still further embodiments of the present disclosure, there is provided a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method for eliminating co-channel interference in any of the above embodiments.

In the above embodiment, the NR base station acquires information related to the CRS and the subframe through a relay node between the NR base station and the LTE base station to generate interference cancellation information, and sends the interference cancellation information to the terminal side for canceling co-channel interference. Therefore, the terminal can eliminate the co-channel interference of LTE and NR based on the interference elimination information issued by the network side.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

The present disclosure can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

fig. 1 illustrates a flow diagram of some embodiments of a method of co-channel interference cancellation of the present disclosure;

FIG. 2 illustrates a flow diagram of further embodiments of the disclosed co-channel interference cancellation method;

fig. 3 shows a signaling diagram of some embodiments of the disclosed co-channel interference cancellation method;

fig. 4a shows a signaling diagram of further embodiments of the disclosed co-channel interference cancellation method;

FIG. 4b is a signaling diagram illustrating further embodiments of the co-channel interference cancellation method of the present disclosure;

fig. 4c shows a signaling diagram of further embodiments of the co-channel interference cancellation method of the present disclosure;

fig. 5 shows a schematic diagram of some embodiments of a co-channel interference cancellation method of the present disclosure;

fig. 6 shows a block diagram of some embodiments of a new air interface base station of the present disclosure;

fig. 7 illustrates a block diagram of some embodiments of a terminal of the present disclosure;

fig. 8 shows a block diagram of some embodiments of an apparatus for cancellation of co-channel interference of the present disclosure;

FIG. 9 shows a block diagram of further embodiments of an apparatus for same-frequency interference cancellation of the present disclosure;

fig. 10 shows a block diagram of some embodiments of a co-channel interference cancellation system of the present disclosure.

Detailed Description

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 the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.

Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.

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

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

As mentioned above, the common terminal may cause part of the downlink resources to be unusable based on reducing the transmission power or reducing the transmission, resulting in reduced system performance. Moreover, since the LTE FDD (Frequency Division duplex) system uses Frequency synchronization rather than time synchronization in the existing network, the synchronization information based approach requires accurate acquisition of timing offset between the rest of the NRFDDs.

That is, in the 5G network deployment process, in order to eliminate CRS interference from LTE, the following defects also exist in the current 5G protocol.

The terminal side lacks CRS related auxiliary information of LTE. Although the same frequency as LTE is used, the terminal generally cannot perform inter-system measurement for neighboring cells at the same time, and needs to measure GAPs (GAPs). In addition, the LTE FDD system usually adopts frequency synchronization rather than time synchronization, so that the LTE FDD system and the NR FDD system in the neighboring cell may not be synchronized, and the terminal may not accurately estimate the location of the CRS of LTE.

An interface and an acquisition means are lacked between the LTE base station and the NR base station. Configuration information (including port number, MBSFN subframe configuration, etc.) of CRS is typically exchanged through an X2 interface in an LTE system. However, in an SA (independent networking) scenario, information interaction between LTE and NR cannot be performed through an interface, and NR cannot automatically acquire information in an efficient manner.

In addition, in consideration of the current interface interaction process, the neighboring cell configuration information of the sender defined in the protocol is optional, and if the neighboring cell configuration information is not sent to the target side, the target side cannot perform configuration of a corresponding interference algorithm according to the neighboring cell configuration information.

The adjacent cell information of the NR interaction lacks CRS and subframe configuration information of an LTE adjacent cell. Currently in an Xn interface, an E-UTRAN cell as a neighbor can be interacted to an NR neighbor. However, the current protocol has only few frequency points of configuration information, and lacks relevant configuration information about CRS ports and frame structures. Therefore, the NR base station cannot obtain effective information of the LTE base station.

The terminal has no relevant interference cancellation information during idle and initial connection setup. The terminal can only obtain the relevant configuration information from the broadcast message in the idle state and the random access process. In addition, complete synchronization with the network has not been truly achieved, and thus there is a lack of associated interference cancellation configurations and methods.

Based on the above requirement and reason analysis, the current 3GPP (3rd Generation Partnership Project) LTE and NR protocols cannot meet the requirements, and need to be enhanced by a new way to meet the requirements of network deployment and optimization.

Therefore, aiming at the problem of interference of the LTE CRS to the NR in the LTE and NR co-channel deployment scene, the terminal disclosed by the invention can eliminate the CRS interference from the LTE cell based on the auxiliary information issued by the network side, so that the co-channel interference from the adjacent cell is reduced, the throughput of the terminal and the system is improved, and the user experience is improved. For example, the technical solution of the present disclosure can be realized by the following embodiments.

Fig. 1 shows a flow chart of some embodiments of the co-channel interference cancellation method of the present disclosure.

As shown in fig. 1, for the base station side, in step 110, the first NR base station receives CRS and subframe related information transmitted by the LTE base station through the relay node. And the LTE base station and the second NR base station are deployed in a co-site mode.

For example, the information related to the CRS and the subframe includes LTE PCI information, LTE cell identifier, CRS port type, downlink frequency point, downlink bandwidth, CRS pattern, and at least one of MBSFN subframe configuration, ABS subframe configuration, and time offset.

In some embodiments, the technical solution of the present disclosure may assist the terminal in performing interference cancellation in two ways: the network side based on the common signaling configuration assists in eliminating interference; and performing interference elimination by the aid of a network side based on special signaling configuration.

In some embodiments, for a mode using common signaling, the CRS and the related information of the subframe are generated by the LTE base station, and then are sent to the second NR base station deployed in a co-located manner, and then are sent to the first NR base station by the second NR base station serving as a relay node.

For example, the information related to the CRS and the subframe is sent by the second NR base station to the first NR base station as a part of the LTE neighbor information through an Xn Setup Request or an NG-RAN Configuration Update Request message. And the first NR base station generates interference elimination information according to the interference cell set and the related information.

The first NR base station indicates each terminal to perform inter-system measurement on LTE base stations deployed in the same station;

in some embodiments, for a dedicated signaling manner, the first NR base station transmits request information of CRS and relevant information of subframes to a relay node of a corresponding LTE base station according to inter-system measurement results of terminals; and the first NR base station acquires the CRS and the related information of the subframe according to the response information of the relay node.

For example, the first NR base station determines a connection mode of the corresponding LTE base station according to the network management configuration information; and determining the relay node and corresponding request information thereof according to the connection mode.

In some embodiments, in the case that the relay node is an AMF entity, the request message is sent to the AMF entity by a cross core network message.

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

In some embodiments, in the case that the relay node is an AMF entity, the first NR base station generates corresponding request information to send to the AMF entity.

The response information is obtained by the following steps: the AMF entity sends the request information to a corresponding MME entity; the MME entity generates request content information according to the identification of the corresponding LTE base station and sends the request content information to the corresponding LTE base station; the LTE base station generates response information according to the request content information and forwards the response information to the AMF entity; and the AMF entity sends the response information to the first NR base station.

For example, the request content 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 a base station identifier of the corresponding LTE base station, TAC information of the corresponding LTE base station, a base station identifier of the first NR base station, TAC information supported by the first NR base station, and a configuration message corresponding to the request.

In some embodiments, in the case where the relay NODE is the second NR base station, the request message is sent to the second NR base station by an Xn interface message NG-RAN NODE CONFIGURATION UPDATE.

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

In some embodiments, in the case that the relay node is the second NR base station, the first NR base station will generate corresponding request information to the second NR base station.

The response information is obtained by the following steps: the second NR base station determines CRS of the corresponding LTE base station and related information of the subframe according to the request information; and the second NR base station sends the relevant information serving as RESPONSE information to the first NR base station through the E-URAN neighboring cell CONFIGURATION information in the Xn interface message NG-RAN NODE CONFIGURATION UPDATE RESPONSE.

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

In some embodiments, the first NR base station obtains a set of interfering cells determined from inter-system measurements of terminals. The interference strength of the cells in the interfering cell set is greater than an interference threshold;

in some embodiments, for a mode using a common signaling, a first NR base station determines, according to inter-system measurement results reported by a plurality of terminals configured or stored by a network manager, a cell interference source of an LTE base station to which the first NR base station is subjected; and determining an interference cell set according to the interference strength of the interference source of each cell.

In some embodiments, for a dedicated signaling manner, the first NR base station instructs each terminal to perform inter-system measurement on the LTE base stations deployed by each co-station, so that each terminal reports an interfering cell set determined according to inter-system measurement results.

For example, in case that the terminal supports SFTD measurement, the terminal is instructed to perform SFTD measurement on at least one LTE cell in the interfering cell set to obtain timing offset of the LTE cells.

In step 130, the first NR base station transmits interference cancellation information to the terminal side, so that the terminal supporting the interference cancellation capability cancels co-channel interference of the LTE base station to the second NR base station according to the interference cancellation information.

In some embodiments, for the approach utilizing common signaling, the first NR base station may broadcast interference cancellation information through SIB1 so that the terminals supporting interference cancellation capability cancel CRS interference in the received information according to the interference cancellation information. The received information includes at least one of random procedure downlink information, paging, and other broadcast information other than SIB 1.

In some embodiments, for the manner using dedicated signaling, the first NR base station receives and stores the capability information supporting interference cancellation sent by the terminal through the AMF entity; and the first NR base station transmits the interference elimination information to the terminal supporting the interference elimination capability through the RRC connection reconfiguration message according to the stored capability information.

For example, the RRC connection reconfiguration message includes PCI information of LTE, CRS port type, downlink frequency point, downlink bandwidth, and CRS pattern. The RRC connection reconfiguration message further comprises at least one of MBSFN subframe configuration, full blank subframe ABS subframe configuration and time deviation.

In some embodiments, a terminal supporting interference cancellation capability cancels co-channel interference by: according to the interference elimination information, determining an original transmission signal of each CRS on an RE symbol; reducing CRS signals of each interference cell according to the channel estimation result of each original transmission signal; and eliminating CRS signals of corresponding interference cells from the received signals.

For example, channel estimation is performed on each antenna of the terminal, and a covariance matrix of each channel estimation result is determined; determining each receiving matrix according to each channel estimation result and the covariance matrix thereof; and restoring the CRS signals of the interference cells according to the receiving matrixes.

In some embodiments, in the case that the terminal does not support the interference cancellation capability but supports the 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 the related information of the subframe. For example, the related information includes CRS pattern, downlink frequency point, downlink bandwidth, and MBSFN subframe configuration. And the first NR base station performs RB-level rate configuration on the LTE cell aiming at the terminal, and eliminates co-channel interference for the terminal.

Fig. 2 shows a flow chart of other embodiments of the disclosed co-channel interference cancellation method.

As shown in fig. 2, for the terminal side, in step 210, the terminal receives interference cancellation information transmitted from the first NR base station. The interference elimination information is generated by the first NR base station according to the received CRS and subframe related information sent by the LTE base station through the relay node.

In some embodiments, for the approach that utilizes common signaling, the terminal receives the interference cancellation information broadcast by the first NR base station through SIB 1.

In some embodiments, for a mode using dedicated signaling, the terminal sends capability information supporting interference cancellation to the first NR base station through the AMF entity; and the terminal receives the interference elimination information sent by the first NR base station through the RRC connection reconfiguration message according to the stored capability information.

In some embodiments, for a mode using common signaling, the terminal performs inter-system measurement on LTE base stations deployed by each co-station, so as to determine an interfering cell set. The interference strength of a cell in the set of interfering cells is greater than an interference threshold. The interference elimination information is generated by the first NR base station according to the interference cell set and the related information.

For example, the terminal sends the inter-system measurement result to the first NR base station, so that the first NR base station determines, according to the inter-system measurement result reported by the network management configuration or the stored terminal, a cell interference source of the LTE base station to which the first NR base station is subjected; and determining an interference cell set according to the interference strength of the interference source of each cell.

In some embodiments, for a mode using common signaling, according to an instruction of the first NR base station, the terminal performs inter-system measurement on LTE base stations deployed by each co-station; the terminal sends the inter-system measurement result to the first NR base station, so that the first NR base station sends request information of CRS and related information of subframes to a relay node of a corresponding LTE base station according to the inter-system measurement result; and acquiring the CRS and the related information of the subframe according to the response information of the relay node.

In some embodiments, for the indication of the first NR base station by using dedicated signaling, the terminal performs inter-system measurement on LTE base stations deployed by each co-station; the terminal determines an interference cell set according to the measurement result of the different systems; the terminal transmits a set of interfering cells to the first NR base station.

For example, in the case of supporting the SFTD measurement, according to the indication of the first NR base station, the terminal performs the SFTD measurement on at least one LTE cell in the interfering cell set to acquire and report the timing offset of the LTE cells to the first NR base station.

In step 220, the terminal eliminates co-channel 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 in a co-site mode.

In some embodiments, the terminal determines, according to the interference cancellation information, an original transmission signal of each CRS on an RE symbol; the terminal restores CRS signals of each interference cell according to the channel estimation result of each original transmission signal; and the terminal eliminates the CRS signals of the corresponding interference cells from the received signals.

For example, the terminal performs channel estimation on each antenna thereof, and determines a covariance matrix of each channel estimation result; the terminal determines each receiving matrix according to each channel estimation result and the covariance matrix thereof; and the terminal restores the CRS signals of the interference cells according to the receiving matrixes.

In some embodiments, for the manner of utilizing common signaling, the terminal cancels CRS interference in the received information according to the interference cancellation information. The received information includes at least one of random procedure downlink information, paging, and other broadcast information other than SIB 1.

In some embodiments, for a dedicated signaling manner, when a received signal is not an MBSFN subframe, the terminal performs CRS interference cancellation according to the interference cancellation information; under the condition that the received signal is an MBSFN subframe, the terminal does not perform CRS interference elimination on the adjacent cell; and when the received signal is ABS, the terminal skips CRS interference elimination processing of the ABS.

In some embodiments, the main idea of network side assisted interference cancellation based on common signaling configuration is: the first base station generates interference elimination configuration information for sending broadcast messages according to CRS (cell-specific reference signal) and subframe related information sent by an LTE (long term evolution) base station through a relay node; after the terminal acquires the relevant information, the interference elimination of CRS is carried out on the broadcast message and the downlink receiving data in the random access process; and after the terminal accesses the network, the terminal informs the network of the capability of the terminal for supporting the CRS interference elimination. For example, network-side assisted interference cancellation based on common signaling configuration may be implemented by the embodiment in fig. 3.

Fig. 3 shows a signaling diagram of some embodiments of the disclosed co-channel interference cancellation method.

As shown in fig. 3, in event 310, the LTE base station generates CRS and related information of subframes of LTE. And if a second NR base station deployed in a co-station exists, sending the CRS and the related information of the subframe to the second NR base station.

For example, the CRS and Subframe related information may include LTE PCI information, LTE cell identifier, CRS port type, downlink frequency point, downlink bandwidth, CRS pattern, MBSFN Subframe configuration (e.g. described with a period of 40ms as the case where the Subframe is configured as an MBSFN Subframe, such as EUTRA-MBSFN-Subframe ConfigList defined in the related art may be adopted), ABS Subframe configuration (e.g. described with a period of 40ms as the case where the Subframe is configured as an ABS Subframe), time offset (if the time can be obtained, the result is given as SFN frame length modulo an offset value from the reference time).

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

In event 330, the first NR base station determines, according to the network management configuration or the stored inter-system measurement results reported by the multiple terminals, an interference source from the LTE cell received by the second NR base station. For example, cells with interference higher than a preset threshold may be added to the interfering cell set.

At event 340, the first NR base station generates interference cancellation information according to the set of interfering cells, and broadcasts it over the air interface via SIB1 message.

For example, the interference cancellation information includes an interference cancellation on indication (used for indicating in real time that the terminal with interference cancellation capability performs interference cancellation according to the following information), and an interference set configuration list.

Each cell configuration information in the interference set configuration list includes PCI, downlink frequency point, downlink bandwidth (e.g., n6, n15, n25, n50, n75, n100, etc., in units of the number of resource blocks RB), CRS pattern (e.g., v-shift defined in 3GPP related art), positioning reference (optionally, a timing offset value from the cell may be employed), MBSFN Subframe configuration (optionally, a case where the cell is configured as an MBSFN Subframe is described with a period of 40ms, and EUTRA-MBSFN-Subframe ConfigList defined in related art may be employed), ABS Subframe configuration (optionally, a case where the cell is configured as an ABS Subframe is described with a period of 40 ms).

In event 350, after receiving the SIB1 message sent by the first NR base station, if the interference cancellation capability is supported, the terminal performs CRS interference cancellation of the LTE neighbor cell according to the network-side auxiliary information when receiving a random procedure downlink message, receiving a paging, and receiving other SIB broadcast messages except SIB 1.

In some embodiments, for each interfering cell, the terminal respectively generates a target LTE CRS sequence according to PCI and CRS patterns of the cell; and determining the time-frequency position and the carrier position of the CRS according to the downlink bandwidth, the downlink frequency point and the positioning reference, and determining 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 ith symbol is d_j(k,l)。

Then, channel estimation is carried out on the channel of the jth receiving antenna of the terminal at the kth subcarrier and the ith symbol, and the result is

The covariance matrix of the channel estimation result can be expressed as:

P₁is the transmission power of CRS in target cell, equal to the received E [ | d [ ]_j(k,l)|²]，N_spRepresenting the sampling rate, N, of RE_BSN (k, l) is noise for the number of antennas.

Calculating a receiving matrix:

the CRS signal of each interfering cell after the reduction is:

the terminal may subtract CRS signals of all interfered cells from the received signal, and then complete the detection result of the RE after removing CRS interference signals by means of MMSE.

In some embodiments, the main idea of network side assisted interference cancellation based on dedicated signaling configuration is: the first NR base station requests the LTE base station to acquire CRS configuration information of an interference LTE cell according to a measurement result of the terminal; the second LTE base station transmits the related configuration information and the synchronization information of other CRSs through the relay node; after acquiring the configuration information and the synchronization information, the first NR base station sends CRS configuration information and synchronization information of a plurality of LTE cells interfering with the second NR base station to a terminal; and the terminal completes the interference elimination scheme for determining the corresponding interference sources on different subframes based on the configuration information of the network side. For example, network-side assisted interference cancellation based on dedicated signaling configuration may be implemented by the embodiment in fig. 4.

Fig. 4a shows a signaling diagram of further embodiments of the disclosed co-channel interference cancellation method.

As shown in fig. 4a, in event 410, the terminal sends the capability information supporting CRS interference cancellation to the AMF entity through NAS (Non-Access Stratum) cell in RRC Setup Complete message.

In event 420, after receiving the NAS message sent by the terminal, the AMF entity sends the capability information to the first NR base station through an Initial UE Context Setup message.

The first NR base station stores the capability information of the terminal, and determines whether the terminal can be configured with interference elimination capability in a connection state according to whether the terminal supports CRS interference elimination.

In event 430, the first NR base station instructs the terminal to perform inter-system measurement on the co-frequency LTE base stations through RRC configuration. And the terminal reports the LTE interference cell set meeting the conditions to the first NR base station according to the measurement result.

For example, if the terminal also supports SFTD measurements and there is at least one cell in the interfering cell set for the first NR base station for which the timing offset with respect to the first NR base station is unknown, the first NR base station may also instruct the terminal to perform SFTD measurements for at least one LTE cell in the interfering cell set. And the terminal feeds back the timing deviation value to the network side according to the measurement result.

At event 440, the first NR base station checks whether cells in the interfering set of cells have CRS and subframe related information. And if one cell does not have the information, determining a connection mode with the LTE base station according to the network management configuration information. And generating a corresponding configuration request message and sending the configuration request message to the relay node so as to acquire the CRS of the first LTE base station and the related information of the subframe.

In some embodiments, event 440 is implemented by the signaling diagram in fig. 4b if the relay node is the first NR base station.

Fig. 4b shows a signaling diagram of other embodiments of the co-channel interference cancellation method of the present disclosure.

As shown in fig. 4b, at event 4410, the first NR base station sends the first request message to the second NR base station via an Xn interface message NG-RAN NODE CONFIGURATION UPDATE.

For example, the first request information includes a request cell list. The information of each cell packet in the request cell list includes an identification of the LTE cell (e.g., ECGI information), request content (e.g., includes at least one of request CRS configuration information, request subframe configuration information).

At event 4420, the second NR base station receives the first request message and obtains CRS and subframe configuration information of the LTE base station through the internal interface.

At event 4430, the second NR base station sends a request RESPONSE to the first NR base station via the E-URAN neighbor 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 may adopt the related information of the CRS and the subframe in any of the above embodiments.

In some embodiments, if the relay node is an entity, the event 440 is implemented by the signaling diagram in fig. 4 c.

Fig. 4c shows a signaling diagram of further embodiments of the disclosed co-channel interference cancellation method.

As shown in fig. 4c, at event 4440, the first NR base station transmits the second request information to the AMF entity via a second cross core network message.

For example, the second request information includes a base station identifier of the LTE base station, TAC information of the LTE base station, a base station identifier of the first NR base station, TAC information supported by the first NR base station, and a request cell list. The information of each cell in the request cell list includes an identity of the LTE cell, request content (e.g., includes at least one of request CRS configuration information, request subframe configuration information).

In event 4450, after receiving the second request message, the AMF entity determines an MME entity according to the TAC information of the LTE base station, and sends the second request message to the MME entity.

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

At event 4470, the LTE base station receives the request content message, generates response information for the request content, and sends it to the MME entity.

In event 4480, the MME entity determines an AMF entity to forward the message according to the TAC information of the first NR base station, and forwards the message to the AMF entity.

At event 4490, the AMF entity determines the base station to which the response message needs to be sent according to the first NR base station identifier, and sends the corresponding message to the first NR base station.

For example, the response message requesting the content includes a base station identifier of the LTE base station, TAC information of the LTE base station, a base station identifier of the first NR base station, TAC information supported by the first NR base station, and a configuration message of the request (the specific content is provided according to the request instruction).

Interference cancellation may be accomplished by the remaining events in fig. 4a after the response information is obtained.

At event 450, the first NR base station determines CRS and subframe related information according to the response information and generates interference cancellation information.

At event 460, the first NR base station sends interference cancellation information to the corresponding terminal through an RRC connection reconfiguration message according to whether the terminal supports the CRS interference cancellation function in the context information of the terminal.

For example, the RRC connection reconfiguration message includes a CRS interference configuration and subframe configuration information list of each LTE cell, and the configuration information of each LTE cell in the list includes LTE PCI information, CRS port types (such as single port, dual port, and four ports), downlink frequency point, downlink bandwidth, CRS pattern, MBSFN subframe configuration (optional), ABS subframe configuration (optional), and time offset (optional).

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

In the embodiment, interference from CRSs (cell-specific channels) of adjacent cells can be eliminated when LTE and NR are deployed adjacently, so that the throughput of the terminal is improved, and the user experience in an LTE and NR coexistence scene is improved.

The interference of the terminal from LTE co-frequency cells in an idle state and before random access is not completed can be reduced, and the reliability of receiving data in the idle state of the terminal is improved. Moreover, the MCS levels of SIB messages and paging messages configured by the terminal can be improved, the PRB overhead of a common channel is reduced, and the performance of the whole system is improved.

The problem that related information of CRS and subframes cannot be interacted due to the fact that a direct connection interface does not exist between LTE and NR is solved, automatic interaction of parameter configuration information is achieved, manual participation behaviors are reduced, and operation and maintenance cost is reduced.

The technical scheme disclosed by the invention has small influence on the terminal and has good backward compatibility and deployment feasibility. In addition, the technical scheme of the method and the device is enhanced on the existing protocol, a new protocol process is not introduced, and the realization difficulty is low.

Fig. 5 shows a schematic diagram of some embodiments of the disclosed method for eliminating co-channel interference.

As shown in fig. 5, in a macro-micro networking scenario, the indoor micro station uses a 20MHz NR device gNB2 with a bandwidth of 2.1GHz, i.e. the second NR base station in any of the above embodiments; the outdoor macro station adopts a 2.1GHz LTE FDD base station eNB, namely the LTE base station in any embodiment, and the LTE base station has the same frequency and the same bandwidth as the indoor NR equipment; the outdoor base station further comprises a 3.5GHz NR TDD base station gNB1, i.e. the first NR base station in any of the above embodiments, and an Xn interface exists between the base station and the indoor base station.

In some embodiments, configuring SIB1 broadcast messages for the base station and the interference cancellation method employed by the terminal before completing the RRC establishment procedure may include the following steps.

And the eNB generates related information of the LTE CRS and the subframe, and sends the related information of the LTE CRS and the subframe to the gNB2 due to the existence of the gNB2 deployed in a co-station manner. The gNB2 sends the CRS of the LTE cell and the information related to the subframe as a part of the LTE neighbor information to the gNB1 through an NG-RAN Configuration Update Request message.

And the gNB1 determines the interference source from the LTE cell received by the gNB1 according to the network management configuration or the stored inter-system measurement results reported by the multiple terminals. The determination method is that the interference cell with interference higher than the preset threshold enters into the interference cell set. And the gNB1 generates interference elimination configuration information according to the interference cell set, and broadcasts the interference elimination configuration information on an air interface through an SIB1 message.

After receiving the SIB1 message sent by the gNB1, if the interference cancellation capability is supported, when receiving a downlink message in a random process, receiving a page, and receiving other SIB broadcast messages except the SIB1, the terminal performs CRS interference cancellation of an LTE neighbor cell according to the network-side auxiliary information.

And the terminal subtracts the CRS signals of all the interfered cells from the received signals, and then completes the detection result of the RE after removing the CRS interference signals in an MMSE mode.

In some embodiments, a method of interference cancellation by a network while a terminal is in a connected state. The following steps may be included.

The terminal carries the capability information supporting CRS interference elimination through NAS information cells in an RRC Setup Complete message. After receiving the NAS message sent by the terminal, the AMF entity sends the capability information to the gNB1 through an Initial UE Context Setup message.

The gNB1 stores capability information and determines whether the terminal can configure interference cancellation capability in the connected state according to whether the terminal supports CRS interference cancellation. And the gNB1 instructs the terminal to perform inter-system measurement on the same-frequency LTE base station through RRC configuration. And the terminal reports the interference cell set meeting the conditions to the gNB1 according to the measurement configuration. The gNB1 checks whether cells in the interfering cell set have CRS and subframe related information.

In case the relay NODE is the gNB2, the first request message is sent by an Xn interface message NG-RAN NODE CONFIGURATION UPDATE.

And when the gNB2 receives the first request message, the gNB determines the CRS of the eNB and the related information of the subframe, which are obtained by the internal interface, and sends a request content RESPONSE message through the E-URAN neighbor CONFIGURATION information in the NG-RAN NODE CONFIGURATION UPDATE RESPONSE message of the Xn interface message.

After receiving the request content response message, the gNB1 sends a CRS interference configuration message to the terminal through an RRC connection reconfiguration message according to whether the terminal supports the CRS interference cancellation function in the context of the terminal.

And the terminal performs CRS interference elimination on the non-MBSFN subframe based on network side configuration, does not perform CRS interference elimination on the adjacent cell on the MBSFN subframe, and skips CRS interference elimination work of the subframe on the ABS subframe.

Fig. 6 shows a block diagram of some embodiments of the new air interface base station of the present disclosure.

As shown in fig. 6, the new air interface base station 6 as the first NR base station includes: a receiving unit 61, configured to receive CRS and subframe related information sent by an LTE base station through a relay node, where the LTE base station is deployed in a co-located manner with a second NR base station; a processing unit 62, configured to generate interference cancellation information according to the relevant information; a sending unit 63, configured to send the interference cancellation information to the terminal side, so that the terminal supporting the interference cancellation capability cancels the co-channel interference of the LTE base station to the second NR base station according to the interference cancellation information.

Fig. 7 illustrates a block diagram of some embodiments of a terminal of the present disclosure.

As shown in fig. 7, the terminal 7 includes: a receiving unit 71, configured to receive interference cancellation information sent by the first NR base station, where the interference cancellation information is generated by the first NR base station according to the received CRS and subframe related information sent by the LTE base station through the relay node; and the processing unit 72 is configured to eliminate co-channel interference of the LTE base station to the second NR base station according to the interference elimination information, where the LTE base station and the second NR base station are deployed in a co-site manner.

In some embodiments, the terminal 7 further includes a sending unit 73, configured to send the inter-system measurement result to the first NR base station, so that the first NR base station determines, according to the inter-system measurement result reported by the terminal and configured by the network manager or stored, a cell interference source of the LTE base station that the first NR base station receives, and then determines, according to interference strength of each cell interference source, an interference cell set.

Fig. 8 shows a block diagram of some embodiments of the same-frequency interference cancellation apparatus of the present disclosure.

As shown in fig. 8, the apparatus 8 for eliminating co-channel interference of this embodiment includes: a memory 81 and a processor 82 coupled to the memory 81, wherein the processor 82 is configured to execute a method for eliminating co-channel interference in any one of the embodiments of the present disclosure based on instructions stored in the memory 81.

The memory 51 may include, for example, a system memory, a fixed nonvolatile storage medium, and the like. The system memory stores, for example, an operating system, an application program, a Boot Loader, a database, and other programs.

Fig. 9 shows a block diagram of other embodiments of the same-frequency interference cancellation apparatus of the present disclosure.

As shown in fig. 9, the apparatus 9 for eliminating co-channel interference of this embodiment includes: a memory 910 and a processor 920 coupled to the memory 910, wherein the processor 920 is configured to execute a method for canceling co-channel interference in any of the foregoing embodiments based on instructions stored in the memory 910.

The memory 910 may include, for example, system memory, fixed non-volatile storage media, and the like. The system memory stores, for example, an operating system, an application program, a Boot Loader, and other programs.

The apparatus for eliminating co-channel interference 9 may further include an input/output interface 930, a network interface 940, a storage interface 950, and the like. These

interfaces

930, 940, 950 and the memory 910 and the processor 920 may be connected, for example, by 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 networking devices. The storage interface 950 provides a connection interface for external storage devices such as an SD card and a usb disk.

Fig. 10 shows a block diagram of some embodiments of the co-channel interference cancellation system of the present disclosure.

As shown in fig. 10, a system 10 for eliminating co-channel interference includes: a new air interface base station 101, serving as a first NR base station, configured to perform a method for eliminating co-channel interference at a base station side in any of the embodiments described above; a terminal 102, configured to execute the method for eliminating co-channel interference on the terminal side in any of the embodiments; and the relay node 103 is configured to forward, to the first NR base station, the CRS and the related information of the subframe transmitted by the LTE base station, where the LTE base station is deployed in a co-site manner with the second NR base station.

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

In some embodiments, the relay NODE 103 is a second NR base station, determines the CRS of the corresponding LTE base station and the relevant information of the subframe according to the request information of the CRS and the relevant information of the 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 neighboring cell CONFIGURATION information in the radio access network NODE CONFIGURATION UPDATE RESPONSE (e.g., NG-RAN NODE CONFIGURATION UPDATE RESPONSE) in the Xn interface message.

As will be appreciated by one of skill in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media having computer-usable program code embodied therein, including but not limited to disk storage, CD-ROM, optical storage, and the like.

So far, the same-frequency interference elimination method, the same-frequency interference elimination apparatus, the same-frequency interference elimination system, the new air interface base station, the terminal, and the nonvolatile computer readable storage medium according to the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.

The method and system of the present disclosure may be implemented in a number of ways. For example, the methods and systems of the present disclosure may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of 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 specifically stated otherwise. Further, in some embodiments, the present disclosure may also be embodied as programs recorded in a recording medium, the programs including machine-readable instructions for implementing the methods according to the present disclosure. Thus, the present disclosure also covers a recording medium storing a program for executing the method according to the present disclosure.

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 foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments 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 is executed by a first new air interface NR base station, and comprises the following steps:

the method comprises the steps that a first NR base station receives cell reference signals CRS and subframe related information sent by a Long Term Evolution (LTE) base station through a relay node, and the LTE base station and a second NR base station are deployed in a co-station mode;

the first NR base station generates interference elimination information according to the relevant information;

and the first NR base station sends the interference elimination information to a 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.

2. The cancellation method of claim 1,

and the CRS and the related information of the subframe are generated by the LTE base station and then are sent to a second NR base station deployed with the LTE base station, and then are sent to the first NR base station by the second NR base station serving as the relay node.

3. The cancellation method of claim 2, wherein,

and the CRS and the related information of the subframe are used as a part of LTE adjacent area information by the second NR base station, and are sent to the first NR base station through an interface establishment request message or a wireless access network configuration update request message.

4. The cancellation method of claim 1, wherein the first NR base station generating interference cancellation information according to the correlation information comprises:

the first NR base station acquires an interference cell set determined according to the inter-system measurement result of each terminal, wherein the interference intensity of cells in the interference cell set is greater than an interference threshold;

and the first NR base station generates the interference elimination information according to the interference cell set and the related information.

5. The cancellation method according to claim 4, wherein the obtaining, by the first NR base station, the set of interfering cells determined according to the inter-system measurement result of each terminal includes:

the first NR base station determines a cell interference source of the LTE base station suffered by the first NR base station according to inter-system measurement results reported by a plurality of terminals configured or stored by a network manager;

and determining the interference cell set according to the interference strength of the interference source of each cell.

6. The cancellation method according to claim 4, wherein the obtaining, by the first NR base station, the set of interfering cells determined according to the inter-system measurement result of each terminal includes:

and the first NR base station instructs each terminal to perform inter-system measurement on the LTE base station deployed by each co-station so that each terminal reports an interference cell set determined according to the inter-system measurement result.

7. The cancellation method of claim 6, wherein the first NR base station instructing each terminal to perform inter-system measurements on a co-sited deployed LTE base station comprises:

and under the condition that the terminal supports system frame number and frame timing difference SFTD measurement, instructing the terminal to perform SFTD measurement on at least one LTE cell in the interference cell set so as to acquire the timing deviation of the LTE cells.

8. The cancellation method of claim 1, wherein the first NR base station transmitting the interference cancellation information to a terminal side comprises:

the first NR base station broadcasts the interference cancellation information through a system information block SIB1, so that a terminal supporting interference cancellation capability cancels CRS interference in reception information according to the interference cancellation information, where the reception information includes at least one of random procedure downlink information, paging, and other broadcast information except SIB 1.

9. The elimination method of claim 1, wherein the first NR base station receiving CRS and subframe related information transmitted by an LTE base station through a relay node comprises:

the first NR base station indicates each terminal to perform inter-system measurement on LTE base stations deployed in each co-station;

the first NR base station sends request information of CRS and related information of subframes to a relay node of a corresponding LTE base station according to the inter-system measurement result of each terminal;

and the first NR base station acquires the CRS and the related information of the subframe according to the response information of the relay node.

10. The elimination method of claim 9, wherein the requesting information to transmit CRS and subframe related information to a relay node of a corresponding LTE base station comprises:

the first NR base station determines the connection mode of the corresponding LTE base station according to the network management configuration information;

and determining the relay node and corresponding request information thereof according to the connection mode.

11. The elimination method of claim 9, wherein the requesting information to transmit CRS and subframe related information to a relay node of a corresponding LTE base station comprises:

and sending the request message to the AMF entity through a cross-core network message under the condition that the relay node is the AMF entity with the authentication management function.

12. The cancellation method of claim 11, wherein,

the request information sent to the AMF entity includes a base station identifier of a corresponding LTE base station, tracking area code TAC information of the corresponding LTE base station, a base station identifier of a first NR base station, TAC information supported by the first NR base station, and a request cell list, and each cell information in the request cell list includes at least one of requested CRS configuration information and subframe configuration information, and a corresponding LTE cell identifier.

13. The elimination method of claim 9, wherein the requesting information to transmit CRS and subframe related information to a relay node of a corresponding LTE base station comprises:

and under the condition that the relay node is an Authentication Management Function (AMF) entity, the first NR base station generates corresponding request information and sends the request information to the AMF entity so that the AMF entity can send the response information to the first NR base station.

14. The cancellation method of claim 13, wherein,

the request content 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 a base station identifier of the corresponding LTE base station, TAC information of the corresponding LTE base station, a base station identifier of the first NR base station, TAC information supported by the first NR base station, and a configuration message corresponding to the request.

15. The elimination method of claim 9, wherein the requesting information to transmit CRS and subframe related information to a relay node of a corresponding LTE base station comprises:

and sending the request message to the second NR base station through a radio access network node configuration update message in an Xn interface message when the relay node is the second NR base station.

16. The cancellation method of claim 15, wherein,

the request message sent to the second NR base station includes a request cell list, where each cell information in the request cell list includes at least one of requested CRS configuration information, subframe configuration information, and a corresponding LTE cell identity.

17. The elimination method of claim 9, wherein the requesting information to transmit CRS and subframe related information to a relay node of a corresponding LTE base station comprises:

and in the case that the relay node is the second NR base station, the first NR base station transmits the generated corresponding request information to the second NR base station, so that the second NR base station transmits the related information as the response information to the first NR base station.

18. The cancellation method of claim 9, further comprising:

the first NR base station receives and stores the capability information supporting interference elimination sent by a terminal through an AMF entity;

wherein,

the first NR base station transmitting the interference cancellation information to a terminal side includes:

and the first NR base station transmits the interference elimination information to a terminal supporting the interference elimination capability through a Radio Resource Control (RRC) connection reconfiguration message according to the stored capability information.

19. The cancellation method of claim 18,

the RRC connection reconfiguration message comprises Physical Cell Identity (PCI) information of LTE, CRS port type, downlink frequency point, downlink bandwidth and CRS pattern,

the RRC connection reconfiguration message further comprises at least one of multicast or multicast single frequency network MBSFN subframe configuration, full blank subframe ABS subframe configuration and time deviation.

20. The elimination method of any one of claims 1-19,

the CRS and subframe related information comprises LTE PCI information, LTE cell identification, CRS port type, downlink frequency point, downlink bandwidth, CRS pattern, and at least one of MBSFN subframe configuration, ABS subframe configuration and time deviation,

the interference elimination information comprises an interference elimination starting indication and an interference cell set configuration list, wherein each cell configuration information in the interference cell set configuration list comprises a PCI, a downlink frequency point, a downlink bandwidth and a CRS pattern of a cell, and at least one of a positioning reference, an MBSFN subframe configuration and an ABS subframe configuration.

21. The cancellation method according to any one of claims 1-19, further comprising:

under the condition that the terminal does not support the interference elimination capability but supports the dynamic spectrum sharing DSS capability, the first NR base station determines an LTE cell with the strongest interference according to the capability of the terminal, the CRS and relevant information of subframes, wherein the relevant information comprises a CRS pattern, a downlink frequency point, a downlink bandwidth and MBSFN subframe configuration;

and the first NR base station performs RB-level rate configuration on the LTE cell aiming at the terminal, and eliminates co-channel interference for the terminal.

22. A method for eliminating co-channel interference, which is executed by a terminal, comprises the following steps:

the terminal receives interference elimination information sent by a first new air interface NR base station, wherein the interference elimination information is generated by the first NR base station according to a received cell reference signal CRS sent by a Long Term Evolution (LTE) base station through a relay node and related information of a subframe;

and the terminal eliminates the co-channel 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 in a co-station mode.

23. The cancellation method of claim 22, further comprising:

the terminal performs inter-system measurement on LTE base stations deployed in all co-stations, and is used for determining an interference cell set, wherein the interference strength of cells in the interference cell set is greater than an interference threshold;

wherein,

the interference cancellation information is generated by the first NR base station according to the interference cell set and the related information.

24. The cancellation method of claim 23, further comprising:

the terminal sends the inter-system 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 to the first NR base station according to the inter-system measurement result reported by the network management configuration or the stored terminal, and then determines the interference cell set according to the interference strength of each cell interference source.

25. The cancellation method of claim 23, further comprising:

according to the indication of the first NR base station, the terminal performs inter-system measurement on LTE base stations deployed by the co-stations;

the terminal determines the interference cell set according to the measurement result of the different systems;

the terminal transmits the set of interfering cells to a first NR base station.

26. The cancellation method of claim 25, wherein the inter-system measurement performed by the terminal on the LTE base stations deployed by the co-stations comprises:

and under the condition of supporting measurement of system frame numbers and frame timing sequence difference (SFTD), according to the indication of the first NR base station, the terminal performs SFTD measurement on at least one LTE cell in the interference cell set so as to acquire and report the timing deviation of the LTE cells to the first NR base station.

27. The cancellation method of claim 22, wherein the receiving, by the terminal, the interference cancellation information transmitted by the first new air interface NR base station includes:

the terminal receiving the interference cancellation information broadcast by the first NR base station through a system information block SIB 1;

the terminal eliminating co-channel interference of the LTE base station to the second NR base station according to the interference elimination information comprises:

and the terminal eliminates CRS interference in received information according to the interference elimination information, wherein the received information comprises at least one of downlink information in a random process, paging and other broadcast information except the SIB 1.

28. The elimination method of claim 22, wherein the eliminating, by the terminal according to the interference elimination information, co-channel interference of the LTE base station to the second NR base station comprises:

the terminal determines an original transmission signal of each CRS on a resource element RE symbol according to the interference elimination information;

the terminal restores CRS signals of each interference cell according to the channel estimation result of each original transmission signal;

and the terminal eliminates the CRS signals of the corresponding interference cells from the received signals.

29. The cancellation method of claim 28, wherein the recovering, by the terminal, the CRS signals of the interfering cells according to the channel estimation result of each original transmission signal includes:

the terminal carries out channel estimation on each antenna of the terminal and determines a covariance matrix of each channel estimation result;

the terminal determines each receiving matrix according to each channel estimation result and the covariance matrix thereof;

and the terminal restores the CRS signals of the interference cells according to the receiving matrixes.

30. The cancellation method of claim 22, further comprising:

according to the indication of the first NR base station, the terminal performs inter-system measurement on LTE base stations deployed in all co-stations;

the terminal sends the inter-system measurement result to the first NR base station, so that the first NR base station sends request information of CRS and subframe related information to a relay node of a corresponding LTE base station according to the inter-system measurement result, and acquires the CRS and subframe related information according to response information of the relay node.

31. The cancellation method of claim 22, further comprising:

the terminal sends the capability information supporting interference elimination to the first NR base station through an AMF entity;

wherein,

the step of the terminal receiving the interference elimination information sent by the first new air interface NR base station comprises the following steps:

and the terminal receives the interference elimination information sent by the first NR base station through a Radio Resource Control (RRC) connection reconfiguration message according to the stored capability information.

32. The elimination method of claim 30, wherein the eliminating co-channel interference of the LTE base station to the second NR base station by the terminal according to the interference elimination information comprises:

under the condition that the received signal is not a multicast or multicast single frequency network MBSFN subframe, the terminal carries out CRS interference elimination according to the interference elimination information;

under the condition that a received signal is an MBSFN subframe, the terminal does not perform CRS interference elimination on an adjacent cell;

and under the condition that the received signal is a full-empty subframe ABS, the terminal skips CRS interference elimination processing of the ABS.

33. A new air interface base station, comprising:

the receiving unit is used for receiving cell reference signals CRS and related information of subframes sent by a Long Term Evolution (LTE) base station through a relay node, and the LTE base station and a second NR base station are deployed in a co-station mode;

a processing unit, configured to generate interference cancellation information according to the relevant information;

a sending unit, configured to send the interference cancellation information to a terminal side, so that a terminal supporting interference cancellation capability cancels co-channel interference of the LTE base station to the second NR base station according to the interference cancellation information.

34. A terminal, comprising:

the receiving unit is used for receiving interference elimination information sent by a first new air interface NR base station, wherein the interference elimination information is generated by the first NR base station according to a received cell reference signal CRS sent by a Long Term Evolution (LTE) base station through a relay node and related information of a subframe;

and the processing unit is used for eliminating the co-channel 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 in a co-station mode.

35. A system for canceling co-channel interference, comprising:

a new air interface base station, as a first new air interface NR base station, configured to perform the method for eliminating co-channel interference according to any one of claims 1 to 21;

a terminal for executing the method for eliminating co-channel interference according to any one of claims 22-32;

the relay node is used for forwarding related information of a cell reference signal CRS and a subframe sent by a Long Term Evolution (LTE) base station to the first NR base station, and the LTE base station and the second NR base station are deployed in a co-station mode.

36. The cancellation system of claim 35, wherein,

the relay node is an Authentication Management Function (AMF) entity, request information of CRS and subframe related information sent by the first NR base station is sent to a corresponding Mobility Management (MME) entity, the MME entity generates request content information according to the identification of the corresponding LTE base station and sends the request content information to the corresponding LTE base station, the LTE base station generates response information according to the request content information and forwards the response information to the AMF entity, and the AMF entity sends the response information to the first NR base station.

37. The cancellation system of claim 35, wherein,

the relay node is the second NR base station, determines the CRS of the corresponding LTE base station and the related information of the subframe according to the request information of the CRS and the related information of the subframe sent by the first NR base station, configures and updates the configuration information of the E-URAN adjacent cell of the evolved universal mobile telecommunications system terrestrial radio access network in response through the radio access network node in the Xn interface message, and sends the related information to the first NR base station as the response information.

38. An apparatus for eliminating co-channel interference, comprising:

a memory; and

a processor coupled to the memory, the processor configured to execute the method for same frequency interference cancellation of any one of claims 1-21 based on instructions stored in the memory.

39. An apparatus for eliminating co-channel interference, comprising:

a memory; and

a processor coupled to the memory, the processor configured to execute the method for same frequency interference cancellation of any one of claims 22-32 based on instructions stored in the memory.

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