KR-102963010-B1 - METHOD AND APPARATUS FOR MITIGATING REMOTE INTERFERENCE IN A WIRELESS COMMUNICATION

KR102963010B1KR 102963010 B1KR102963010 B1KR 102963010B1KR-102963010-B1

Abstract

The present disclosure relates to 5G ( 5th generation) or pre-5G communication systems designed to support higher data transmission rates than 4G ( 4th generation) communication systems such as LTE (Long Term Evolution). A method and apparatus for operation between a base station and a server for mitigating long-range interference are disclosed in a time division duplex (TDD)-based wireless communication system. The base station transmits and receives a remote interference management reference signal (RIM-RS) for identifying long-range interference and can determine whether to mute based on this. The base station transmits a report of the received RIM-RS information to a server, and the server performs a bidirectional test to determine a suitable RIM mode for each base station and then notifies the base station accordingly. Accordingly, a suitable RIM mode can be adaptively selected to mitigate long-range interference depending on the pattern of occurrence of long-range interference.

Inventors

임종부
구성모
김병국
변명광
최옥영
김영환
이규연
이충용
이현욱

Assignees

삼성전자주식회사
연세대학교 산학협력단

Dates

Publication Date: 20260511
Application Date: 20200821

Claims (20)

In a wireless communication system using time division duplexing (TDD), regarding the operation method of a base station, The process of receiving a remote interference management reference signal (RIM-RS) from at least one other base station, A process for identifying remote interference (RI) from at least one other base station based on the above RIM-RS, and A method comprising the process of applying muting to at least a portion of the transmitting radio resources of the base station based on the RI and the channel capacity of the base station.
In claim 1, the process of applying muting based on the RI and the channel capacity of the base station is performed based on the following mathematical formula, and In the above mathematical formula, S is the transmission power, N is the noise signal power, I i v is the power of RI generated by the i -th base station, and loss i v A method where is the reduction in channel capacity of the i-th base station, and α represents the muting index.
◈Claim 3 was waived upon payment of the establishment registration fee.◈ In claim 1, the RIM-RS is simultaneously received from at least one other base station, and The process of applying muting based on the above RI and the channel capacity of the base station is performed based on the following mathematical formula, and In the above mathematical formula, S represents the transmission power, N represents the noise signal power, I i v represents the power of RI generated by the i- th base station, and α represents the muting index.
In claim 1, The process of transmitting RIM-RS reception information to the server The process of receiving RIM mode information from the above server is further included, The above RIM mode information is determined based on the above RIM-RS reception information, and The above RIM mode information is: A first RIM mode that applies muting to at least a portion of the transmitting radio resources of the base station; or A method relating to at least one of a second RIM mode for reporting information about the RI to the server or the other base station.
In claim 4, The above RIM mode information is related to the above second RIM mode, and The above method is, The process of receiving a muting instruction from the above server, A method further comprising the process of applying muting according to the above-mentioned muting instructions.
In claim 4, A method further comprising a process of maintaining or switching the RIM mode based on the received RIM mode information.
Claim 4 further includes the process of transmitting location information to the server, A method in which the above RIM mode information is determined based on the above RIM-RS reception information and the above location information.
In a wireless communication system using time division duplexing (TDD), regarding the operation method of a server, The process of receiving RIM-RS reception information reports from a base station, A process of determining the RIM mode of the base station based on the above RIM-RS reception information report, It includes a process of transmitting the RIM mode determined by the above base station, and The above RIM mode is: A first RIM mode in which the base station applies muting to at least a portion of the transmitting radio resources of the base station; or A method in which the base station is determined to be at least one of a second RIM mode in which it reports information about RI to the server or another base station.
In claim 8, The above RIM mode is determined to be the above second RIM mode, and The above method is, A process of determining muting for at least a portion of the transmitting radio resources of the base station based on the above RI and the channel capacity of the base station, A method comprising the process of transmitting instructions for muting at least a portion of a wireless resource for transmission to the base station.
◈Claim 10 was waived upon payment of the establishment registration fee.◈ In claim 9, the process of determining muting for at least a portion of the transmitting wireless resources of the base station is determined based on the following mathematical formula, and In the above mathematical formula, S represents transmission power, N represents noise signal power, I a i represents the power of RI generated by the aggressor base station to the i -th victim base station, α represents the muting index, and loss i a represents the reduction in channel capacity of the i-th victim base station.
In a wireless communication system using time division duplexing (TDD), in a base station device, Transmitter/receiver; and It includes at least one processor, The above at least one processor is: Receiving a remote interference management reference signal (RIM-RS) from at least one other base station; Identify remote interference (RI) from at least one other base station based on the above RIM-RS; A device configured to apply muting to at least a portion of the transmitting radio resources of the base station based on the RI and the channel capacity of the base station.
◈Claim 12 was waived upon payment of the establishment registration fee.◈ In claim 11, the at least one processor It is configured to apply muting based on the RI and the channel capacity of the base station based on the following mathematical formula, and In the above mathematical formula, S is the transmission power, N is the noise signal power, I i v is the power of RI generated by the i -th base station, and loss i v is a device where is the reduction amount of the channel capacity of the i-th base station and α is the muting index.
◈Claim 13 was waived upon payment of the establishment registration fee.◈ In claim 11, the at least one processor It is configured to apply muting based on the RI and the channel capacity of the base station based on the following mathematical formula, and In the above mathematical formula, S represents the transmission power, N represents the noise signal power, I i v represents the power of RI generated by the i- th base station, and α represents the muting index, and The above RIM-RS is a device that receives simultaneously from at least one other base station.
◈Claim 14 was waived upon payment of the establishment registration fee.◈ In claim 11, The above-mentioned at least one processor is, Transmit RIM-RS reception information to the server, and It is configured to receive RIM mode information from the above server, and The above RIM mode information is determined based on the above RIM-RS reception information, and The above RIM mode information is: A first RIM mode that applies muting to at least a portion of the transmitting radio resources of the base station; or A device associated with at least one of a second RIM mode that reports information about the RI to the server or the other base station.
◈Claim 15 was waived upon payment of the establishment registration fee.◈ In claim 14, the RIM mode information is associated with the second RIM mode, and The above-mentioned at least one processor is, Received a muting instruction from the above server, and A device further configured to apply muting according to the above muting instructions.
◈Claim 16 was waived upon payment of the establishment registration fee.◈ In claim 14, the at least one processor is, A device further configured to maintain or switch the RIM mode based on the received RIM mode information.
◈Claim 17 was waived upon payment of the establishment registration fee.◈ In claim 14, the at least one processor is, It is further configured to transmit location information to the above server, and A device in which the above RIM mode information is determined based on the above RIM-RS reception information and the above location information.
In a wireless communication system using time division duplexing (TDD), regarding a server device, Transmitter/receiver; and It includes at least one processor, The above at least one processor is: Receive RIM-RS reception information reports from the base station; Based on the above RIM-RS reception information report, determine the RIM mode of the base station; It is configured to transmit the RIM mode determined by the above base station, and The above RIM mode is: A first RIM mode in which the base station applies muting to at least a portion of the transmitting radio resources of the base station; or A device determined to be at least one of a second RIM mode in which the base station reports information about RI to the server or another base station.
◈Claim 19 was waived upon payment of the establishment registration fee.◈ In claim 18, the RIM mode is determined to be the second RIM mode, and The above-mentioned at least one processor is, Based on the above RI and the channel capacity of the base station, muting of at least a portion of the transmitting radio resources of the base station is determined, and A device further configured to transmit instructions for muting at least a portion of the wireless resources for transmission to the base station.
◈Claim 20 was waived upon payment of the establishment registration fee.◈ In claim 19, The above at least one processor is configured to determine muting for at least a portion of the transmitting wireless resources of the base station based on the following mathematical formula, and In the above mathematical formula, S represents transmission power, N represents noise signal power, I a i represents the power of RI generated by the aggressor base station to the i -th victim base station, α represents the muting index, and loss i a represents the amount of channel capacity reduction of the i-th victim base station.

Description

Method and apparatus for mitigating remote interference in a wireless communication system The present disclosure relates to a wireless communication system, and specifically to a method for mitigating remote interference (RI) occurring in a time division duplex (TDD) system. Efforts are being made to develop improved 5G ( 5th generation) communication systems or pre-5G communication systems to meet the increasing demand for wireless data traffic following the commercialization of 4G ( 4th generation) communication systems. For this reason, 5G communication systems or pre-5G communication systems are referred to as Beyond 4G Network communication systems or Post-LTE systems. To achieve high data transmission rates, 5G communication systems are being considered for implementation in the mmWave band (e.g., the 60 GHz band). To mitigate path loss and increase the transmission distance of radio waves in the mmWave band, beamforming, massive MIMO, full Dimensional MIMO (FD-MIMO), array antenna, analog beamforming, and large-scale antenna technologies are being discussed for 5G communication systems. In addition, to improve the network of the system, technologies such as advanced small cell, advanced small cell, cloud radio access network (cloud RAN), ultra-dense network, Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation are being developed in 5G communication systems. In addition, advanced coding modulation (ACM) methods such as FQAM (Hybrid Frequency Shift Keying and Quadrature Amplitude Modulation) and SWSC (Sliding Window Superposition Coding), as well as advanced access technologies such as FBMC (Filter Bank Multi Carrier), NOMA (Non Orthogonal Multiple Access), and SCMA (Sparse Code Multiple Access) are being developed in 5G systems. Signals transmitted by cells located far from the cell take a long time to transmit and can therefore be received during the uplink resource interval of other cells. Since the received signals act as interference to the cell, they cause a degradation in the quality of uplink communication. To control long-distance interference, the central server instructed base stations causing long-distance interference to mute, but there were problems due to the delay in these instructions. FIG. 1 illustrates a wireless communication system according to various embodiments of the present disclosure. FIG. 2a illustrates the configuration of a base station in a wireless communication system according to various embodiments of the present disclosure. FIG. 2b illustrates the configuration of a server in a wireless communication system according to various embodiments of the present disclosure. FIG. 3 illustrates a long-distance interference control protocol according to various embodiments of the present disclosure. FIG. 4 illustrates the signal flow of a base station and a server for centralized remote interference management (C-RIM) according to various embodiments of the present disclosure. FIG. 5 illustrates the operation flow of a base station for distributed remote interference management (D-RIM) according to various embodiments of the present disclosure. FIG. 6 illustrates the signal flow of a base station and a server according to H-RIM (hybrid-remote interference management) according to various embodiments of the present disclosure. FIG. 7 illustrates examples of operations of a base station and a server according to H-RIM according to various embodiments of the present disclosure. FIG. 8 illustrates other examples of operations of a base station and a server according to H-RIM according to various embodiments of the present disclosure. FIG. 9 illustrates another example of the operations of a base station and a server according to H-RIM according to various embodiments of the present disclosure. FIG. 10 illustrates another example of the operations of a base station and a server according to H-RIM according to various embodiments of the present disclosure. FIG. 11 illustrates another example of the operations of a base station and a server according to H-RIM according to various embodiments of the present disclosure. FIG. 12a illustrates the functional configuration of a server and base station device according to C-RIM according to various embodiments of the present disclosure. FIG. 12b illustrates the functional configuration of a base station according to D-RIM according to various embodiments of the present disclosure. FIG. 12c illustrates the functional configuration of a server and base station device according to an H-RIM protocol mode according to various embodiments of the present disclosure. FIG. 13 illustrates the operation flow of a base station and a server according to an H-RIM protocol mode utilizing location information of a base station according to various embodiments of the present disclosure. The terms used in this disclosure are used merely to describe