KR20220023626A - Method and apparatus for mitigating remote interference in a wireless communication - Google Patents

Abstract

The present invention relates to a 5^th generation (5G) or pre-5G communication system for supporting a data transmission rate higher than a 4^th generation (4G) communication system such as long term evolution (LTE). Disclosed are an operation method and device between a base station and a server for mitigating remote interference 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 remote interference, and can determine whether or not to perform muting on its own on the basis thereof. The base station transmits an RIM-RS reception information report to the server, and the server determines a suitable RIM mode for each base station by performing a bidirectional test, and then can notify the base station of the determined RIM mode. Therefore, a suitable RIM mode for mitigating the remote interference can be adaptively selected in accordance with the aspects of the occurrence of remote interference.

Description

METHOD AND APPARATUS FOR MITIGATING REMOTE INTERFERENCE IN A WIRELESS COMMUNICATION

The present disclosure relates to a wireless communication system, and specifically relates to a method for mitigating remote interference (RI) occurring in a time division duplex (TDD) system.

Efforts are being made to develop an improved ^5th generation ( ^5G ) communication system or a pre-5G communication system in order to meet the increasing demand for wireless data traffic after commercialization of the 4G (4th generation) communication system. For this reason, the 5G communication system or the pre-5G communication system is called a 4G network after (Beyond 4G Network) communication system or an LTE (Long Term Evolution) system after (Post LTE) system.

In order to achieve a high data transmission rate, the 5G communication system is being considered for implementation in a very high frequency (mmWave) band (eg, such as a 60 gigabyte (60 GHz) band). In order to alleviate the path loss of radio waves and increase the propagation distance of radio waves in the ultra-high frequency band, in the 5G communication system, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) are used. ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed.

In addition, to improve the network of the system, in the 5G communication system, an evolved small cell, an advanced small cell, a cloud radio access network (cloud radio access network, cloud RAN), and an ultra-dense network (ultra-dense network) , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and reception interference cancellation Technological development is in progress.

In addition, in the 5G system, Hybrid Frequency Shift Keying and Quadrature Amplitude Modulation (FQAM) and Sliding Window Superposition Coding (SWSC), which are advanced coding modulation (Advanced Coding Modulation, ACM) methods, and Filter Bank Multi Carrier (FBMC), an advanced access technology, ), Non Orthogonal Multiple Access (NOMA), and Sparse Code Multiple Access (SCMA) are being developed.

Since a signal transmitted by a cell located far from the cell is transmitted for a long time, it may be received during an uplink resource period of another cell. Since the received signal acts as interference to the corresponding cell, it causes degradation of quality for uplink communication. In order to control the long-range interference, the central server instructs the base station to cause the long-range interference to muting, but there is a problem due to the delay of the instruction.

Based on the above discussion, the present disclosure provides an apparatus and method for effectively controlling inter-cell interference in a wireless communication system.

In addition, the present disclosure provides an apparatus and method for more efficiently providing interference by performing an operation for mitigating long-range interference between base stations without server intervention.

In addition, the present disclosure provides an apparatus and method for providing rapid interference control by performing an operation for mitigating interference by the base station itself on the premise of the bidirectionality of the interference without information on the status of other base stations.

In addition, the present disclosure provides an apparatus and method for determining a remote interference management (RIM) mode suitable for a base station based on an interference aspect in a wireless communication system.

In addition, the present disclosure provides an apparatus and method for effectively mitigating interference by controlling interference by grouping adjacent base stations by using location information of the base station.

A method of operating a base station according to various embodiments of the present disclosure includes a process of receiving a remote interference management reference signal (RIM-RS) from at least one other base station, the at least one based on the RIM-RS It may include a process of identifying remote interference (RI) from another base station of , and applying muting based on the RI and channel capacity of the base station.

A method of operating a server according to various embodiments of the present disclosure includes receiving a RIM-RS reception information report from a base station, determining a RIM protocol mode of the base station based on the RIM-RS reception information report, and the It may include the process of transmitting the determined RIM protocol mode to the base station.

A base station apparatus according to various embodiments of the present disclosure includes a transceiver, and at least one processor operatively connected to the transceiver, wherein the at least one processor includes at least one other Receive a remote interference management reference signal, RIM-RS, and identify remote interference (RI) from the at least one other base station based on the RIM-RS, and the RI and channel capacity of the base station It may be a device configured to apply muting based on muting.

A server device according to various embodiments of the present disclosure includes a transceiver and at least one processor operatively connected to the transceiver, wherein the at least one processor receives a RIM-RS reception information report from a base station and , based on the RIM-RS reception information report, determine the RIM protocol mode of the base station, and may be an apparatus configured to transmit the determined RIM protocol mode to the base station.

By responding to long-range interference without the intervention of a server, the effect of reducing the delay time for interference control is provided. In addition, by adaptively determining the type of RIM (remote interference management) according to the occurrence aspect of RI (remote interference), effective long-distance interference control is possible.

The effects obtainable in the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those of ordinary skill in the art to which the present disclosure belongs from the description below. will be.

1 illustrates a wireless communication system according to various embodiments of the present disclosure.
2A illustrates a configuration of a base station in a wireless communication system according to various embodiments of the present disclosure.
2B illustrates a configuration of a server in a wireless communication system according to various embodiments of the present disclosure.
3 illustrates a far-field interference control protocol according to various embodiments of the present disclosure.
4 illustrates a signal flow of a base station and a server for centralized remote interference management (C-RIM) according to various embodiments of the present disclosure.
5 illustrates an operation flow of a base station for distributed remote interference management (D-RIM) according to various embodiments of the present disclosure.
6 illustrates signal flows of a base station and a server according to hybrid-remote interference management (H-RIM) according to various embodiments of the present disclosure.
7 illustrates an example of operations of a base station and a server according to H-RIM according to various embodiments of the present disclosure.
8 illustrates another example of operations of a base station and a server according to H-RIM according to various embodiments of the present disclosure.
9 illustrates another example of operations of a base station and a server according to H-RIM according to various embodiments of the present disclosure.
10 illustrates another example of operations of a base station and a server according to H-RIM according to various embodiments of the present disclosure.
11 illustrates another example of operations of a base station and a server according to H-RIM according to various embodiments of the present disclosure.
12A illustrates a functional configuration of a server and a base station apparatus according to C-RIM according to various embodiments of the present disclosure.
12B illustrates a functional configuration of a base station according to D-RIM according to various embodiments of the present disclosure.
12C illustrates functional configurations of a server and a base station apparatus according to an H-RIM protocol mode according to various embodiments of the present disclosure.
13 illustrates an operation flow of a base station and a server according to an H-RIM protocol mode using location information of a base station according to various embodiments of the present disclosure.

Terms used in the present disclosure are used only to describe specific embodiments, and may not be intended to limit the scope of other embodiments. The singular expression may include the plural expression unless the context clearly dictates otherwise. Terms used herein, including technical or scientific terms, may have the same meanings as commonly understood by one of ordinary skill in the art described in the present disclosure. Among the terms used in the present disclosure, terms defined in a general dictionary may be interpreted with the same or similar meaning as the meaning in the context of the related art, and unless explicitly defined in the present disclosure, ideal or excessively formal meanings is not interpreted as In some cases, even terms defined in the present disclosure cannot be construed to exclude embodiments of the present disclosure.

In various embodiments of the present disclosure described below, a hardware access method will be described as an example. However, since various embodiments of the present disclosure include technology using both hardware and software, various embodiments of the present disclosure do not exclude a software-based approach.

Terms that refer to control information used in the following description (eg, information, value, command), terms for an operation state (eg, step, operation, procedure (eg, step) procedure)), terms referring to signals (signal, sequence, symbol, information), terms referring to data, and terms referring to network entities (eg, base station, digital unit (DU), RU (radio unit), EMS (element management system)), AU (access unit), CU (centralized unit), LMS (LTE management server), management device (management device)), a term referring to messages (eg, signal ( signal), command, data, triggering, notification), and terms referring to components of the device are exemplified for convenience of description. Accordingly, the present invention is not limited to the terms described below, and other terms having equivalent technical meanings may be used.

In addition, in the present disclosure, in order to determine whether a specific condition is satisfied (satisfied) or satisfied (fulfilled), an expression of more than or less than is used, but this is only a description to express an example, and more or less description is excluded not to do Conditions described as 'more than' may be replaced with 'more than', conditions described as 'less than', and conditions described as 'more than and less than' may be replaced with 'more than and less than'.

Also, although the present disclosure describes various embodiments using terms used in some communication standards (eg, 3rd Generation Partnership Project (3GPP)), this is only an example for description. Various embodiments of the present disclosure may be easily modified and applied in other communication systems.

1 illustrates a wireless communication system according to various embodiments of the present disclosure. Referring to FIG. 1 , a wireless communication system includes a base station 110 , a base station 120 , and a management device 130 . 1 illustrates a base station 110 and a base station 120 as a part of nodes using a radio channel in a wireless communication system, other base stations may be further included.

The base station 110 and the base station 120 are network infrastructures that provide wireless access to terminals. The base station 110 and the base station 120 have coverage defined as a certain geographic area based on a distance at which signals can be transmitted. Base station 110 and base station 120, in addition to the base station (base station), 'access point (AP)', 'eNodeB (eNodeB, eNB)', '5G node (5th generation node)', 'G-node It may be referred to as 'next generation nodeB, gNB', 'wireless point', 'transmission/reception point (TRP)' or other terms having an equivalent technical meaning. In some cases, a cell may indicate a communication area provided by a base station. One base station may cover one cell or multiple cells. Here, a plurality of cells may be divided by a supported frequency and a covered sector area. In the following description, a base station may be used as a term including a cell, or a cell may be used as a term referring to a base station.

The management device 130 is an object that controls a plurality of base stations (or cells) including the base station 110 and the base station 120 . The management device 130 may be an object corresponding to a 'server'. For example, the management device 130 may control interference between cells. According to various embodiments, the management device 130 may control to identify an aggressor cell, and may control an aggressor cell, a victim cell, a detection cell, or terminals to avoid interference. According to an embodiment, the management device 130 may be located in a base station. Also, according to an embodiment, the management device 130 may be a network entity separate from the base station.

A time duplex division (TDD) communication system supports downlink communication and uplink communication between a base station and a terminal by using different time resources. Because propagation delay occurs while the signal is transmitted over the radio channel, the downlink signal of a cell may be received during the time resource for the uplink of another cell. Therefore, there is a need for a method for measuring inter-cell interference caused by propagation delay and providing good communication quality by controlling the interference.

Before describing the inter-cell interference of the present disclosure, a resource structure of a TDD communication system is exemplarily described. In some embodiments, the base station and the terminal may use a TDD communication system of LTE. The LTE TDD communication system defines a time resource for downlink communication and a time resource for uplink communication in one radio frame. The radio frame may include a UL subframe for uplink (UL) transmission and a DL subframe for downlink (DL) transmission. The frame may include a special subframe (SSF) for switching from high link transmission to uplink transmission. Here, a combination of a UL subframe, a DL subframe, and a special subframe included in one frame is referred to as a UL/DL configuration. Different UL/DL configurations represent different combinations of UL subframes, DL subframes, and special subframes in one frame. For example, UL/DL configuration #2 may include 6 DL subframes, 2 UL subframes, and 2 special subframes, and UL/DL configuration #5 includes 8 DL subframes. , one UL subframe, and one special subframe. In some embodiments, the wireless communication environment 100 may support a long term evolution (LTE)-TDD communication system. In this case, the UL/DL configuration may be operated as shown in Table 1 below. In Table 1 below, D denotes a DL subframe, S denotes a special subframe, and U denotes a UL subframe.

UL/DL configuration subframe number Number of each subframe 0 One 2 3 4 5 6 7 8 9 DL UL S 0 D S U U U D S U U U 2 6 2 One D S U U D D S U U D 4 4 2 2 D S U D D D S U D D 6 2 2 3 D S U U U D D D D D 6 3 One 4 D S U U D D D D D D 7 2 One 5 D S U D D D D D D D 8 One One 6 D S U U U D S U U D 3 5 2

The special subframe may include a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS). DwPTS is a section for downlink resources in a special subframe and may be used for transmission of a physical downlink shared channel (PDSCH). UpPTS is a period for uplink resources within a special subframe, and may be used for transmitting a sounding reference signal (SRS) or a physical random access channel (PRACH). The guard period (GP) is a period in which both downlink transmission and uplink transmission do not occur, and may be a period required for downlink-uplink conversion. The guard period (GP) may be a period located between DwPTS and UpPTS within one special subframe (eg, 1 ms). Here, the combination of DwPTS, guard period, and UpPTS included in one special subframe is referred to as a special subframe configuration (SSF configuration). Different SSF configurations indicate different combinations of the length of the DwPTS, the length of the guard interval, and the length of the UpPTS in one frame. When the wireless communication environment 100 supports the LTE-TDD communication system, the SSF configuration may be operated as shown in Table 2 below. For example, SSF configuration #5 indicates a combination in which DwPTS occupies 3 symbols, a guard interval occupies 9 symbols, and UpPTS occupies 2 symbols, and SSF configuration #7 has DwPTS 10 symbols and a guard interval These two symbols, and a combination in which UpPTS occupies two symbols, may be represented.

SSF configuration symbol number 0 One 2 3 4 5 6 7 8 9 10 11 12 13 0 Dw GP Up One Dw GP Up 2 Dw GP Up 3 Dw GP Up 4 Dw GP Up 5 Dw GP Up 6 Dw GP Up 7 Dw GP Up 8 Dw GP Up 9 Dw GP Up

Also, in some embodiments, the base station and the terminal may use the NR TDD communication system. The NR TDD communication system may be configured more flexibly than the LTE TDD communication system. In NR, the number of slots and symbols included in one subframe may vary according to subcarrier spacing and the like. Therefore, unlike in the LTE TDD communication system, where 7 UL and DL allocation patterns are predefined in Table 1 and the symbol configuration of a special subframe is defined in Table 2, the NR TDD communication system is for downlink communication. A DL-UL pattern indicating a relationship between a DL time resource and a UL time resource for uplink communication is defined. The DL-UL pattern may include a configuration period (periodicity), a DL time interval, and a UL time interval. The configuration period may refer to a time to which one DL-UL pattern is applied. For example, the configuration period may be one of 0.5ms, 0.625ms, 1ms, 1.25ms, 2,5ms, 3ms, 4ms, 5ms, and 10m. The DL time period may be a time resource in which downlink communication is continued. The DL time interval may be expressed by the number of slots, or may be expressed only by the number of slots and the number of symbols, or the number of symbols. A DL time interval may be located in a beginning part within one configuration period. The UL time interval may be a time resource in which the uplink is continued. Unlike the LTE TDD communication system, the UL time interval defined in the NR TDD communication system is not expressed in units of subframes, but may be expressed in terms of the number of slots or only the number of slots and the number of symbols, or the number of symbols. . Therefore, the expression 'special subframe' defined in the LTE TDD communication system may not be used. A UL time interval may be located at an end part within one configuration period. A slot other than a DL slot (a slot in which all symbols are DL symbols) and a UL slot (a slot in which all symbols are UL symbols) within one configuration period may be a flexible slot.

As an example of a resource structure of NR TDD, when subcarrier spacing (SCS) is 15 kHz, 5 slots may be defined for a configuration period of 5 ms. Among the five slots, the first two slots are downlink slots, the latter two slots are uplink slots, and the middle slot can coexist with an uplink symbol and a downlink symbol. Among the 14 symbols of the remaining slot, the first 5 symbols are downlink symbols, the last 3 symbols of the 14 symbols are uplink symbols, and the remaining 6 symbols of the 14 symbols are flexible symbols. there is.

In the TDD communication system, since the same carrier frequency is used for uplink transmission and downlink transmission, it is necessary to distinguish between a DL time interval and a UL time interval. Accordingly, as described above, the resource structures for the TDD communication system may include a DL time interval and a UL time interval, and a residual interval between the DL time interval and the UL time interval. Meanwhile, due to this time distinction, inter-cell interference due to propagation delay may occur. For example, in the LTE communication system, the base station 110 may transmit or receive signals according to the frames 112 . The base station 120 may transmit or receive signals according to the frames 122 . In frames 112 or 122, 'D' is a downlink subframe, a slot or a symbol, 'S' is a special subframe, a slot or a flexible symbol, and 'U' is an uplink It means a link (uplink) subframe, slot or symbol. In some cases, a signal transmitted from the base station 110 may act as interference to the base station 120 . For example, in a time division (TD) system such as the example of FIG. 1 , even if the base station 110 and the base station 120 are tens to hundreds of kilometers apart, the signal transmitted from the base station 110 has strong interference to the base station 120 . can act as For example, a downlink signal transmitted in a downlink pilot time slot (DwPTS) of a special subframe of the base station 110 is received by the base station 120 during the period of the uplink subframe of the base station 120 after experiencing a propagation delay. If so, the signal may act as interference to the uplink signal received by the base station 120 . Even if the distance between base stations is several hundred kilometers, it can act as an interference source.

As described above, as the downlink signal of a specific cell is transmitted for a long time, the downlink signal may be received within the uplink resource interval of a cell located far from the specific cell. In other words, the base station and the terminal within the cell located at a distance may receive interference from the specific cell. Due to the propagation delay of the far cell, the interference introduced into the UL time interval may be referred to as far cell interference, time-of-flight (TOF) interference, air duct interference, atmospheric interference, propagation delay interference, or far-field interference. . Hereinafter, this disclosure will be described by referring to such interference as atmospheric interference. In addition, a specific cell that interferes is an aggressor, an aggressor base station, an aggressor cell, an interferer, an interferer base station, or an interferer cell, and the interfering cell is a victim, a victim base station , may be referred to as a victim cell, a victim, a victim cell, a detector, or a detector base station. For example, the base station 110 may be an attacker cell and the base station 120 may be a victim cell. Here, the concept of attacker/interferer/victim/detector is relative, and any cell may be both an attacker cell and a victim cell at the same time.

When a downlink signal of another cell is introduced into the UL time interval, the UL signal transmitted with a relatively low output may be vulnerable to atmospheric interference due to the downlink signal. Accordingly, a problem in that the victim cell cannot detect an uplink signal may occur. In order to solve the problem caused by interference, an attacker cell (eg, a cell of the base station 110) for an interfering victim cell (eg, a cell of the base station 120) is identified, and the victim cell can avoid the interference. There is a need for a method or a method for reducing the interference of an attacker cell. However, when the interference signal is received from a long distance of several tens to hundreds of kilometers, there are very many attacker candidate cells, so it is not easy to specify an effective attacker cell. In addition, there is a high possibility that a plurality of attacker cells exist. Accordingly, the present disclosure identifies an aggressor cell and proposes various embodiments for reducing or avoiding interference.

In the interference relationship described with reference to FIG. 1, in the LTE communication system, atmospheric interference has been described as being generated by a signal transmitted in DwPTS of a special subframe being received in UpPTS of a special subframe or a subsequent uplink subframe. In the NR TDD communication system, since DL, UL slots and symbol patterns are indicated by a slot indicator included in higher layer signaling and downlink control information (DCI), a special subframe applied in the LTE communication system may not be applied. Although not shown in FIG. 1, atmospheric interference in the NR TDD system may be interpreted as being generated by receiving a signal transmitted in a downlink symbol in a flexible symbol or an uplink symbol among symbol structures included in slots.

2A illustrates a configuration of a base station in a wireless communication system according to various embodiments of the present disclosure. The configuration illustrated in FIG. 2A may be understood as a configuration of the base station 110 or the base station 120 . Hereinafter used '… wealth', '… The term 'group' means a unit that processes at least one function or operation, which may be implemented as hardware or software, or a combination of hardware and software.

Referring to FIG. 2A , the base station includes a wireless communication unit 210 , a backhaul communication unit 220 , a memory 230 , and a processor 240 .

The wireless communication unit 210 performs functions for transmitting and receiving signals through a wireless channel. For example, the wireless communication unit 210 performs a function of converting between a baseband signal and a bit stream according to a physical layer standard of the system. For example, when transmitting data, the wireless communication unit 210 generates complex symbols by encoding and modulating the transmitted bit stream. In addition, when receiving data, the wireless communication unit 210 restores the received bit stream through demodulation and decoding of the baseband signal.

In addition, the wireless communication unit 210 up-converts the baseband signal into a radio frequency (RF) band signal, transmits the signal through the antenna, and downconverts the RF band signal received through the antenna into a baseband signal. To this end, the wireless communication unit 210 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital to analog converter (DAC), an analog to digital converter (ADC), and the like. Also, the wireless communication unit 210 may include a plurality of transmission/reception paths. Furthermore, the wireless communication unit 210 may include at least one antenna array composed of a plurality of antenna elements.

In terms of hardware, the wireless communication unit 210 may be composed of a digital unit and an analog unit, and the analog unit includes a plurality of sub-units according to operating power, operating frequency, etc. can be composed of The digital unit may be implemented by at least one processor (eg, a digital signal processor (DSP)).

The wireless communication unit 210 transmits and receives signals as described above. Accordingly, all or part of the wireless communication unit 210 may be referred to as a 'transmitter', a 'receiver', or a 'transceiver'. In addition, in the following description, transmission and reception performed through a wireless channel are used in the meaning of including the processing as described above by the wireless communication unit 210 .

The backhaul communication unit 220 provides an interface for performing communication with other nodes in the network. That is, the backhaul communication unit 220 converts the bit string transmitted from the base station to another node, for example, another access node, another base station, upper node, core network, etc. into a physical signal, and converts the physical signal received from the other node. Convert to bit string.

The memory 230 stores data such as a basic program, an application program, and setting information for the operation of the base station. The memory 230 may be configured as a volatile memory, a non-volatile memory, or a combination of a volatile memory and a non-volatile memory. In addition, the memory 230 provides stored data according to the request of the processor 240 .

The processor 240 controls overall operations of the base station. For example, the processor 240 transmits and receives a signal through the wireless communication unit 210 or through the backhaul communication unit 220 . In addition, the processor 240 writes data to and reads data from the memory 230 . In addition, the processor 240 may perform functions of a protocol stack required by a communication standard. According to another implementation example, the protocol stack may be included in the wireless communication unit 210 . To this end, the processor 240 may include at least one processor. According to various embodiments, the processor 240 may control the base station (eg, the base station 110 or the base station 120) to perform operations according to various embodiments described below.

2B illustrates a configuration of a server in a wireless communication system according to various embodiments of the present disclosure. 2B may be understood as a configuration of the management device 130 . Hereinafter used '… wealth', '… The term 'group' means a unit that processes at least one function or operation, which may be implemented as hardware or software, or a combination of hardware and software.

Referring to FIG. 2B , the server includes a transceiver 250 , a memory 260 , and a processor 270 .

The transceiver 250 provides an interface for communicating with other devices (eg, a base station) in a network. That is, the transceiver 250 converts a bit string transmitted from the management device to another device into a physical signal, and converts a physical signal received from the other device into a bit string. That is, the transceiver 250 may transmit and receive signals. Accordingly, the transceiver 250 may be referred to as a modem, a transmitter, a receiver, or a communication unit. In this case, the transceiver 250 enables the management device or the server to communicate with other devices or systems via a backhaul connection (eg, wired backhaul or wireless backhaul) or via a network.

The memory 260 stores data such as a basic program, an application program, and setting information for the operation of the management device. The memory 260 may be configured as a volatile memory, a non-volatile memory, or a combination of a volatile memory and a non-volatile memory. In addition, the memory 260 provides stored data according to the request of the processor 270 .

The processor 270 controls overall operations of the management device. For example, the processor 270 transmits and receives a signal through the transceiver 250 . In addition, the processor 270 writes data to and reads data from the memory 260 . To this end, the processor 270 may include at least one processor. According to various embodiments, the processor 270 may control the management device to perform operations according to various embodiments to be described later.

In relation to the terms used in the description of the present invention, a base station that transmits a downlink (DL) signal in a communication system to generate remote interference (RI) is an aggressor base station, thereby an uplink ( A base station experiencing degradation in reception performance of an uplink, UL signal may be defined as a victim base station, respectively. In order to identify the occurrence pattern of far-field interference and measure the signal-to-interference-plus-noise ratio (SINR) of the victim base station, all base stations receive a pre-allocated RIM-reference signal. , RIM-RS) may be sequentially transmitted to a predetermined system frame number (SFN). Each base station may transmit a result to the central server after measuring a correlation coefficient between the received signal and the RIM-RS. The central server collects RIM-RS-related information received at regular intervals, selects a dominant aggressor base station that causes particularly large remote interference to a large number of victim base stations, and then performs muting of the dominant aggressor base station. By directing it, far-field interference can be mitigated.

3 illustrates a far-field interference control protocol according to various embodiments of the present disclosure. In FIG. 3 , definitions of far-range interference control protocols, which are to be described in the present disclosure, are described. The remote interference management protocol may include a centralized-remote interference management (C-RIM) protocol, a distributed-remote interference management (D-RIM), and a hybrid-remote interference management (H-RIM) protocol.

In this disclosure, the C-RIM protocol is referred to and described as C-RIM, C-RIM protocol, C-RIM mode, or C-RIM protocol mode.

In this disclosure, the D-RIM protocol is referred to and described as D-RIM, D-RIM protocol, D-RIM mode, or D-RIM protocol mode.

In this disclosure, the H-RIM protocol is referred to and described as H-RIM, H-RIM protocol, H-RIM mode, or H-RIM protocol mode.

Referring to FIG. 3 , the long-range interference control method according to the C-RIM 310 may be a method of controlling long-range interference of base stations under the control of a central server. The base station 311 shown in FIG. 3 may be the base station 110 or the base station 120 shown in FIG. 1 , and may be an aggressor base station. The base stations 313 - 1 to 310 -N may be victim base stations receiving interference from the base station 311 . The base station 311 may transmit a reference signal (RS) for identifying long-range interference to the base stations 313-1, 313-2 to 313-N. The reference signal for identifying the remote interference may be defined as a remote interference management reference signal (RIM-RS). The RIM-RS may be a signal transmitted and received by the base station. The base station may measure inter-cell interference by receiving the RIM-RS, and may transmit information on the interference to another base station. The base stations 313 - 1 to 313 -N may transmit a reference signal reception report to the server based on the reference signal received from the base station 311 . The server 315 receiving the reference signal may determine whether muting of the base station 311 is necessary. In determining whether muting is required, a series of calculations may be performed based on a reception report of a reference signal received from the base stations 313 - 1 to 313 -N. As a result of the operation, when the server 315 determines that muting of the base station 311 is necessary, the server 315 may instruct the base station 311 to muting. Upon receiving the muting command, the base station 311 may perform muting, and interference to the base stations 313-1 to 313-N may be mitigated.

The long-distance interference control method according to the D-RIM 320 may be a method of controlling far-range interference by applying muting by itself between the base stations through the transmission of a reference signal between the base stations. The base station 321 may be an attacker base station causing interference to other base stations. The base stations 323 - 1 to 323 -N may be victim base stations receiving interference from the base station 321 . Although the base station 321 is shown as an attacker base station and the base stations 323-1 to 323-N are shown as victim base stations, this is only an example, and the base station 321 may be a victim base station, and the base station 323-1 to 323-N is a victim base station. 1 to 323-N), at least one base station may be an attacker base station. The base station 321 may transmit a reference signal for identifying far-range interference to the base stations 323-1 to 323-N. The base station 321 may receive a reference signal for identifying far-field interference from the base stations 323-1 to 323-N. Although not shown in the drawing, reference signals may be mutually transmitted and/or received between the base stations 323-1 to 323-N. The base station 321 may determine whether the base station 321 is causing interference to the base stations 323-1 to 323-N based on the reference signal received from the base stations 323-1 to 323-N. there is. Specifically, the base station 321 may determine whether to perform muting by itself.

The C-RIM protocol, which relies on a central server to determine whether a base station is muting, takes a very long time to mitigate long-distance interference due to a signal transmission/reception delay time between the base station and the server and a signal processing time of the central server. Due to this, the victim base station may suffer from degradation in reception performance of uplink signals due to long-range interference for a long time. In addition, in the C-RIM protocol, the identification of the occurrence pattern of interference that changes over time is delayed due to the intervention of the server, and the downlink traffic of the attacker's base station may be reduced due to unnecessary muting performed during the delay time. In comparison with this, in the case of D-RIM, since the base station itself determines whether to mute or not, the signal transmission process between the server and the base station is omitted, thereby reducing the delay time due to the server's intervention.

The H-RIM protocol is a long-range interference mitigation method that selects a suitable RIM protocol according to the occurrence pattern of the long-range interference. In some cases, it is more efficient for the central server to command muting of a specific base station than to determine whether to mute between the base stations, whereas it is more efficient than the central server to command muting between the base stations. there is This may be different depending on whether the occurrence of interference is bidirectional or unidirectional. The operations of the base station and the server according to the H-RIM may be a process of maintaining or switching the existing RIM mode in order to perform a test on the occurrence of interference and operate in a more suitable RIM mode according to the result.

4 illustrates a signal flow of a base station 410 and a server 420 according to a centralized remote interference management (C-RIM) protocol according to various embodiments of the present disclosure. The base station 410 illustrates the base station 110 or the base station 120 of FIG. 1 . The terminal exemplifies the terminal of FIG. 3 . The C-RIM (centralized RIM) protocol is a RIM protocol in which a central server selects a base station to which muting is applied based on the RI power generated by each base station. 4 illustrates an operation process of the base station 410 and the server 420 according to the C-RIM protocol. Although only the base station 410 is shown, there may be a plurality of base stations transmitting and receiving RIM-RS with the server 420 .

Referring to FIG. 4 , in step 401 , the base station may receive a remote interference management reference signal (RIM-RS) from another base station. The RIM-RS may be a reference signal for identifying information about long-distance interference exchanged between base stations. The RIM-RS may be a signal received by the base station according to a method designated between the base stations. Although not shown in the figure, the base station 401 may transmit the RIM-RS to another base station. Based on the RIM-RS transmitted from the base station 401, another base station may perform an operation according to C-RIM, D-RIM or H-RIM.

In step 403 , the base station 410 may transmit a RIM-RS reception information report to the server 420 . Although not shown in the figure, another base station may transmit a RIM-RS reception information report to the server 420 based on the received RIM-RS signal. The RIM-RS reception information reported by the base station 410 to the server 420 may include information indicating the degree of interference that the base station 410 has on other base stations and the degree of interference that the base station 410 receives from other base stations. there is. Specifically, the base station 410 may identify RIM-RS reception information by calculating a correlation coefficient after transmitting a predetermined RIM-RS.

The server 420 may determine whether the base station 410 is muting based on the RIM-RS reception information report received from the base station 410 and other base stations. For example, the server 420 applies muting to the base station 410 when the total channel capacity reduction due to the interference of the victim base stations is greater than the channel capacity decreased when muting is applied to the base station 410 . can decide what to do. As another example, the server 420 may determine whether to mute the base station 410 based on the base station's transmit power and noise signal power. As another example, the server 420 may determine whether to mute the base station 410 based on the transmit power of the base station, the noise signal power, and the magnitude of long-range interference that the attacker base station generates to the victim base station. As another example, the server 420 may determine muting of the base station 410 based on the following equation.

Equation 1 represents a condition for the server to determine muting of the base station in the C-RIM protocol. In Equation 1, S is transmit power, N is noise signal power, I ^a _i is the RI power generated by the aggressor base station to the i -th victim base station, and α may mean a muting index. α may be a factor for adjusting a weight between the decrease in the channel capacity of the aggressor base station and the increase in the total channel capacity of the victim base station. loss _i ^a may mean a decrease in channel capacity of the i-th victim base station. The base station 410 and other base stations may report the RIM-RS reception information to the server 420, and the server 420 may determine the RI occurrence pattern between the base stations based on the received information and select a base station for muting application. .

In step 405 , the server 420 may determine muting of the base station 410 . The server 420 may determine muting of the base station 410 based on Equation 1 above.

In step 407 , the server 420 may transmit a signal for applying muting to the base station 410 . The signal for applying muting may be a signal including information instructing the base station 410 to stop specific signaling. In addition, the signal for applying muting may include information on the type of signaling to be stopped and the duration of muting.

In step 409, the base station 410 that has received the signal for applying the muting may apply the muting. The muting may be an operation of stopping at least one signaling among signaling being performed by the base station. When muting is applied, all signaling being performed by the base station may be stopped, or only some signaling may be stopped. The stopped signaling may be stopped for a predetermined period or for a period indicated by the server. The server 420 may indicate the muting application period, but may also transmit a muting cancellation signal separately to instruct the base station 410 to cancel the muting. In this case, the base station 410 may maintain the muting state until the muting release signal is transmitted. Even when muting is applied, the base station 410 may not mute RIM-RS transmission signaling. The base station 410 may receive a RIM-RS from another base station while maintaining the muting state. Also, the base station 410 may perform a RIM-RS transmission operation and a reception RIM-RS information reporting operation while maintaining the muting state.

5 illustrates an operation flow of a base station for distributed remote interference management (D-RIM) according to various embodiments of the present disclosure.

The D-RIM (distributed-RIM) protocol refers to a RIM protocol that applies muting to the base station itself on the assumption that the RI is bidirectional. With respect to long-range interference, a base station may affect other base stations as an attacker base station, or may be interfered with as a victim base station. In a wireless communication system, the degree to which a signal transmitted from a base station acts as interference to another base station and the degree to which a signal transmitted from another base station acts as an interference to the base station may vary depending on the case. For example, the extent to which the base station causes interference to other base stations and the extent to which the base station receives interference from other base stations may be similar. As another example, the degree of interference caused by the base station to other base stations may be large, but the degree of interference received by the base station from other base stations may be small. In general, the bidirectionality of remote interference (RI) may mean a property similar to the degree of mutual interference between base stations. The bidirectionality of RI may refer to a case in which the degree to which the base station causes interference from other base stations is similar to the degree to which the base station receives interference from other base stations. The D-RIM protocol corresponds to a long-distance interference mitigation method in which muting is applied by the base station itself, on the premise of the bidirectionality of the RI.

Referring to FIG. 5 , in step 501 , the base station may receive a RIM-RS from another base station. Although not shown in the figure, there may be other base stations operating in D-RIM. Apart from the base station receiving the RIM-RS from the other base station, the base station may transmit the RIM-RS for identifying far-range interference to the other base station. The RIM-RS may be a reference signal for identifying information about long-distance interference exchanged between base stations. For RIM-RS, a predetermined signaling rule may exist between base stations, and accordingly, base stations may perform RIM-RS signaling. Although not shown in the figure, the base station may transmit the RIM-RS to another base station. Based on the RIM-RS transmitted from the base station, another base station may perform an operation according to C-RIM, D-RIM or H-RIM.

In step 503, the base station may determine whether to apply muting by itself. When the base station decides to apply muting, the base station may apply muting. Specifically, the base station may decide to apply muting when the amount of reduction in channel capacity due to RI signals received from each base station is greater than the channel capacity of the base station that is reduced when muting is applied. Since the D-RIM protocol does not require server intervention, that is, it does not require signaling with the server, it is possible to apply muting faster than C-RIM.

The above-described D-RIM protocol may be divided into two cases according to the RIM-RS transmission method of the base stations. The D-RIM protocol, which will be described later, may assume bidirectional RI between base stations.

In an embodiment, when the base station sequentially receives the RIM-RS, the base station may calculate the RI power from another base station through the sequentially received RIM-RS. The base station may decide whether to apply muting by itself. For example, the base station may determine whether the decrease in channel capacity due to the RI that the transmission signal of the base station affects other base stations is greater than the decrease in channel capacity when the base station applies muting by itself. When the amount of reduction in channel capacity due to RI that the base station exerts on other base stations is greater than the amount of reduction in channel capacity when applying muting to itself, the base station may apply muting by itself. As another example, the base station may determine muting based on the base station's transmit power and noise signal power. As another example, the base station may determine muting based on the transmit power of the base station, the noise signal power, and the magnitude of far-field interference that the base station generates to another base station. As another example, the base station may determine muting based on Equation 2 below.

In Equation 2, S is the transmit power, N is the noise signal power, I _i ^v is the RI power generated by the i -th base station, loss _i ^v may mean a decrease amount of the channel capacity of the i-th base station, and α may mean a muting index.

In an embodiment, when the base stations transmit RIM-RSs at the same time, the base station may calculate the total amount of RI power received from other base stations through the RIM-RSs simultaneously received. The base station may decide whether to apply muting by itself. For example, muting may be determined based on whether the total channel capacity reduction due to the RI that the base station exerts on other base stations is greater than the channel capacity reduction amount when the base station applies muting by itself. If the total channel capacity reduction due to RI that the base station exerts on other base stations is greater than the channel capacity reduction amount when muting is applied to itself, the base station may apply muting by itself. As another example, the base station may determine muting based on the base station's transmit power and noise signal power. As another example, the base station may determine muting based on the transmit power of the base station, the noise signal power, and the magnitude of far-field interference that the base station generates to another base station. As another example, the base station may determine muting based on Equation 3 below.

In Equation 3, S is transmit power, N is noise signal power, I _i ^v is RI power generated by the i -th base station, and α may mean a muting index.

Since the base stations simultaneously transmit the RIM-RS, even if the number of base stations increases, the time taken to determine whether to muting may not change. In addition, since the total RIM-RS transmission time is shorter than the method in which the base stations sequentially transmit the RIM-RS according to the above-described embodiment, it is possible to quickly cope with long-range interference.

6 illustrates signal flows of a base station and a server according to hybrid-remote interference management (H-RIM) according to various embodiments of the present disclosure.

A hybrid-remote interference management (H-RIM) protocol may refer to a protocol for mitigating RI by selecting a suitable RIM protocol mode according to an RI generation aspect between base stations. The selectable RIM protocol mode may be the aforementioned C-RIM or D-RIM. The D-RIM protocol may exhibit superior performance when a bidirectionally occurring reciprocal RI is generated and maintained, and when the generated RI is destroyed. On the other hand, when unidirectional (non-reciprocal) RI is generated and maintained, C-RIM may exhibit superior performance. Table 3 below shows the predominant RIM protocol according to the above-described RI occurrence pattern.

Occur maintain extinction Reciprocal RI D-RIM D-RIM D-RIM Non-reciprocal RI C-RIM C-RIM D-RIM

6 illustrates an operation process of the base station 610 and the server 620 according to the H-RIM protocol. Although not shown in the figure, there may be other base stations performing RIM protocol signaling with the server 620 . Although not shown in the figure, before step 601 , the base station 610 may operate in a C-RIM or D-RIM as a default mode. The basic mode may mean a RIM mode in which the base station is currently operating. The basic mode may be set by the base station 610 or may be set according to an instruction from the server 620 . When the base station 610 is operating in the C-RIM as the basic mode, it may transmit and receive signals for mitigating long-range interference with the server according to the C-RIM operation described in FIG. 4 . When the base station 610 is operating in the D-RIM as the basic mode, it may transmit and receive signals for mitigating long-range interference with other base stations according to the D-RIM operation described in FIG. 5 .

Referring to FIG. 6 , in step 601 , the base station may receive a RIM-RS from another base station. The base station 610 may identify RIM-RS reception information based on the RIM-RS received from the other base station. The RIM-RS may be a reference signal for identifying information about long-distance interference exchanged between base stations. The RIM-RS may be a signal received by the base station according to a method designated between the base stations. Although not shown in the figure, the base station 611 may transmit the RIM-RS to another base station. Based on the RIM-RS transmitted from the base station 610, another base station may perform an operation according to C-RIM, D-RIM, or H-RIM.

In step 603 , the base station 610 may transmit a RIM-RS reception information report to the server 620 . The RIM-RS reception information reported by the base station 610 to the server 620 may include information indicating the degree of interference that the base station 610 has on other base stations and the degree of interference that the base station 610 receives from other base stations. there is. Specifically, the base station 610 may identify RIM-RS reception information by calculating a correlation coefficient after transmitting a predetermined RIM-RS.

In step 605, the server 620 may perform a reciprocity test for each base station. The bidirectional test may be a test for determining whether the RI generation pattern is bidirectional or unidirectional between base stations. In order to perform the interactivity test, the server 620 may calculate the total channel capacity loss that the base station 610 causes as an attacker base station and the total channel capacity loss that the base station 610 receives as a victim base station. The server 620 compares the total channel capacity loss that the base station 610 generates as the attacker base station with the total channel capacity loss received as the victim base station, thereby generating a reciprocal RI between the base station 610 and another base station. can determine whether or not When the smaller of the total channel capacity loss generated by the aggressor base station and the total channel capacity loss received as the victim base station is more than half of the larger value, it can be determined that the RI generation pattern is bidirectional. For another example, if the smaller of the total channel capacity loss value generated by the attacker base station and the total channel capacity loss value received as the victim base station is less than half of the larger value, it is determined that the RI generation pattern is unidirectional. can As another example, the interactivity test performed by the server 620 may be performed based on Equation 1, Equation 2, or Equation 3 described above.

In step 607 , the server 620 may determine a RIM protocol mode suitable for the base station 610 according to the result of performing the interactivity test performed in step 605 . For example, when it is determined that the RI generation pattern between the base station 610 and another base station is bidirectional as a result of the test, the server 620 may determine that the base station 610 operates in the D-RIM protocol mode. For another example, when it is determined that the RI generation pattern between the base station 610 and another base station is unidirectional as a result of the test, the server 620 may determine that the base station 610 operates in the C-RIM protocol mode.

In step 609 , the server 620 may transmit the RIM protocol mode determined in step 607 to the base station 610 . For example, when the server 620 determines that the base station 610 operates in the D-RIM protocol mode, the server 620 may transmit the D-RIM protocol mode to the base station 610 . For another example, when the base station 610 determines that the base station 610 operates in the C-RIM protocol mode, the server 620 may transmit the C-RIM protocol mode.

In step 611 , the base station 610 may maintain the set RIM protocol mode or switch to another RIM protocol mode according to the RIM protocol mode received from the server 620 . For example, a base station operating in the C-RIM protocol mode may maintain the C-RIM protocol mode or perform switching to the D-RIM protocol mode. As another example, in the case of a base station operating in the D-RIM protocol mode, switching to the C-RIM protocol mode may be performed or the D-RIM protocol mode may be maintained.

7 illustrates an example of operations of a base station and a server according to H-RIM according to various embodiments of the present disclosure.

Specifically, FIG. 7 illustrates a process in which the base station 701 operating in the C-RIM protocol mode operates according to the C-RIM protocol as it is. Although only the base station 701 is illustrated in FIG. 7 , other base stations communicating with the base station 701 and the server 703 may exist. 7 shows only the operation according to the RIM mode of the base station 701, the server 703 can communicate with the base station 701 and other base stations, and controls interference between the base station 701 and other base stations. can play a role.

Referring to FIG. 7 , in step 711 , the base station 701 may set a default mode of the H-RIM protocol to the C-RIM protocol mode. The basic mode may mean a mode in which a base station operating according to the H-RIM protocol mode initially operates. C-RIM or D-RIM may exist in the basic mode. As the RIM protocol mode is set to C-RIM, the base station 701 may operate according to C-RIM. The operation according to the C-RIM may correspond to the operation of the base station 410 described above in FIG. 4 .

In step 713 , the base station 701 may transmit a remote interference management-reference signal (RIM-RS) to and receive from another base station to identify remote interference. The RIM-RS may be a reference signal for identifying information about long-distance interference exchanged between base stations. The RIM-RS may be a signal that is mutually transmitted and received between the base stations according to a method designated between the base stations.

In step 715 , the base station 701 may transmit a RIM-RS reception information report to the server 703 . The RIM-RS reception information report may be identified based on the RIM-RS received by the base station 701 in step 713 . The RIM-RS reception information report may include information indicating the degree of interference that the base station 701 has on other base stations and the degree of interference that the base station 701 receives from other base stations. Specifically, after receiving the predetermined RIM-RS, the base station 701 may identify the RIM-RS reception information report through calculation of a correlation coefficient.

In step 717, the server 703 may perform a reciprocity test for each base station. The bidirectional test may be a test for determining whether the RI generation pattern is bidirectional or unidirectional between base stations. To perform the interactivity test, the server 703 may calculate the total channel capacity loss that the base station 701 causes as an attacker base station and the total channel capacity loss it receives as a victim base station. The server 703 compares the total channel capacity loss caused by the base station 701 as the attacker base station with the total channel capacity loss received as the victim base station, thereby generating a reciprocal RI between the base station 701 and another base station. can determine whether or not For example, when the smaller of the total channel capacity loss generated by the attacker base station and the total channel capacity loss received as the victim base station is more than half of the larger value, it can be determined that the RI generation pattern is bidirectional. For another example, if the smaller of the total channel capacity loss value generated by the attacker base station and the total channel capacity loss value received as the victim base station is less than half of the larger value, it is determined that the RI generation pattern is unidirectional. can

In step 719, the server 703 selects a RIM protocol mode suitable for a base station operating according to the H-RIM protocol mode among the base station 701 and other base stations according to the result of performing the interactivity test performed in step 717. can decide For example, when it is determined that the RI generation aspect of the base station is bidirectional as a result of the test, the server 703 may determine that the base station 701 operates as a D-RIM. For another example, if it is determined that the RI generation aspect of the base station is unidirectional as a result of the test, the server 703 may determine that the base station 701 operates as a C-RIM.

In step 721 , the server 703 may determine whether to mute the base station 701 and other base stations operating in the C-RIM protocol mode.

In step 723, while the server 703 performs steps 717, 719 and 721, the base station 701 may transmit RIM-RS to and receive RIM-RS from other base stations. In other words, while the server determines the next RIM protocol mode of the base station, it can continue to operate as C-RIM.

In step 725 , the server 703 may transmit the RIM protocol mode determined in step 719 to the base station 701 . Specifically, the server 703 may transmit signaling for operating in the C-RIM protocol mode to the base station 701 .

In step 727 , the server 703 may notify whether the base station 701 is muted according to the result determined in step 721 . For example, when the server 703 determines that the base station 701 performs muting in step 721 , the server 703 may transmit signaling for applying the muting to the base station 701 . As another example, when the server 703 determines that the base station 701 does not need to perform muting in step 721 , the server 703 may not transmit signaling for applying the muting to the base station 701 .

In step 729, the base station 701 may transmit a RIM-RS to another base station and receive a RIM-RS from the other base station.

In step 731 , the base station 701 may apply muting when receiving a signaling for applying muting from the server 703 .

Operations after step 733 may correspond to operations of the base station 701 and the server 703 shown in steps 711 to 731 . In step 733, the base station 701 may maintain the C-RIM mode. The base station 701 may maintain the C-RIM protocol as it receives the signaling for operating in the C-RIM protocol mode from the server 703 .

In step 735 , the base station 701 may transmit a RIM-RS to and receive a RIM-RS from another base station.

In step 737, the base station 701 may transmit a RIM-RS reception information report to the server.

In step 739 , the server 703 may perform a bi-directional test with respect to long-distance interference between the base station 701 and another base station.

In step 741 , the server 703 may determine the next RIM protocol mode of the base station 701 and the base station operating in the H-RIM protocol mode.

In step 743 , the server 703 may determine muting of base stations in C-RIM operation. In step 745 , the base station 701 may transmit a RIM-RS to and receive a RIM-RS from another base station while the server 703 performs steps 739 , 741 and 743 .

At step 747 , server 703 may transmit the next RIM protocol mode of base station 701 .

In step 749 , the server 749 may notify the base station 701 of whether to mute.

In step 751, the base station 701 may transmit the RIM-RS to another base station and receive the RIM-RS from the other base station.

At step 753 , the base station 701 may apply muting as notified at step 749 . For example, when the base station 701 receives a signal for applying muting in step 749 , the base station 701 may apply muting. For another example, when a signal for applying muting is not notified to the base station 701 in step 749 , the base station 701 may not apply muting.

8 illustrates another example of operations of a base station and a server according to H-RIM according to various embodiments of the present disclosure.

Specifically, FIG. 8 illustrates a process in which the base station 801 operating in the D-RIM protocol mode operates according to the D-RIM protocol mode as it is. Although only the base station 801 is illustrated in FIG. 8 , other base stations communicating with the base station 801 and the server 803 may exist. Although only the operations according to the RIM mode of the base station 801 and the server 803 are shown, the server 803 can communicate with other base stations as well as the base station 801, and use the RIM protocol mode of the other base stations. can direct

Referring to FIG. 8 , in step 811 , the base station 801 may determine the basic mode of the RIM protocol mode as the D-RIM protocol mode. The basic mode may mean a mode in which a base station operating according to the H-RIM protocol mode initially operates. C-RIM or D-RIM may exist in the basic mode. As the RIM protocol mode is set to D-RIM, the base station 801 may operate according to D-RIM. The operation according to the D-RIM may correspond to the operation of the base station 510 described above in FIG. 5 .

In step 813 , the base station 801 may transmit a RIM-RS to another base station and may receive a RIM-RS from the other base station. The RIM-RS may be a reference signal for identifying information about long-distance interference exchanged between base stations. The RIM-RS may be a signal that is mutually transmitted and received between the base stations according to a method designated between the base stations.

In step 815 , the base station 801 may determine whether to apply muting by itself. When the base station decides to apply muting, the base station may apply muting by itself. Specifically, the base station may apply muting when the amount of channel capacity reduction due to the RI signals received from each base station is greater than the channel capacity of the base station that decreases when muting is applied. Since the D-RIM protocol does not require server intervention, that is, it does not require signaling with the server, it is possible to apply muting faster than C-RIM.

In step 817 , the base station 801 may transmit a RIM-RS reception information report to the server 803 . The RIM-RS reception information report may be identified based on the RIM-RS received by the base station 801 in step 813 . The RIM-RS reception information report may include information indicating the degree of interference that the base station 801 has on other base stations and the degree of interference that the base station 801 receives from other base stations. Specifically, after receiving the predetermined RIM-RS, the base station 801 may identify the RIM-RS reception information report through calculation of a correlation coefficient.

In step 819, the server 803 may perform an interactivity test of the base station 801 and another base station. The bidirectional test may be a test for determining whether the RI generation pattern is bidirectional or unidirectional between base stations. To perform the interactivity test, the server 803 may calculate the total channel capacity loss that the base station 801 causes as an attacker base station and the total channel capacity loss it receives as a victim base station. The server 803 compares the total channel capacity loss that the base station 801 causes as the attacker base station with the total channel capacity loss that the base station 801 receives as the victim base station, thereby generating a reciprocal RI between the base station 801 and another base station. can determine whether or not For example, when the smaller of the total channel capacity loss generated by the attacker base station and the total channel capacity loss received as the victim base station is more than half of the larger value, it can be determined that the RI generation pattern is bidirectional. For another example, if the smaller of the total channel capacity loss value generated by the attacker base station and the total channel capacity loss value received as the victim base station is less than half of the larger value, it is determined that the RI generation pattern is unidirectional. can

In step 821 , the server 803 may determine a RIM protocol mode suitable for a base station operating in the H-RIM protocol mode among the base station 801 and other base stations according to the result of the interactivity test performed in step 819 . . For example, when it is determined that the RI generation aspect of the base station is bidirectional as a result of the test, the server 803 may determine that the base station 801 operates as a D-RIM. For another example, when it is determined that the RI generation aspect of the base station is unidirectional as a result of the test, the server 803 may determine that the base station 801 operates as a C-RIM.

In step 823 , the server 803 may determine whether to mute the base station 801 and other base stations operating in the C-RIM protocol mode. Specifically, the server 803 determines the muting of the base station 801 when the total channel capacity reduction due to the interference of the victim base stations is greater than the channel capacity that decreases when muting is applied to the base station 801. there is.

While the server 803 performs steps 819, 821, and 823, the base station 801 may operate according to the D-RIM protocol mode. For example, in step 825 , the base station 801 may transmit a RIM-RS to and receive a RIM-RS from another base station. In step 827 , the base station 801 may determine muting by itself based on the transmitted/received RIM-RS. If you decide to mute, you can apply muting.

In step 829 , the server 803 may send the RIM protocol mode to the base station 801 . For example, the server 803 may transmit to the base station 801 to operate in the D-RIM protocol mode.

In step 831, the base station 801 receiving the D-RIM protocol mode may maintain the D-RIM protocol mode. Accordingly, the base station 801 may transmit the RIM-RS to the other base station and receive the RIM-RS from the other base station in step 833 . In step 835 , the base station 801 may determine that the base station 801 itself applies muting, and may apply the muting accordingly.

In step 837 , the base station 801 may transmit a RIM-RS reception information report to the server 803 .

In step 839, the server 803 may perform a bi-directional test for each base station.

In step 841 , the base station 801 may determine the next RIM protocol mode of base stations operating in the D-RIM protocol mode.

In step 843, the server 803 may determine muting of base stations operating in the C-RIM protocol mode. While server 803 performs steps 839 , 841 , and 843 , base station 801 may transmit RIM-RS to and receive RIM-RS from other base stations in step 845 .

In step 847 , the base station 801 may determine whether or not to apply muting by the base station itself, and may apply the muting.

In step 849 , the server 803 may transmit the RIM protocol mode of the base station 801 determined in step 841 to the base station 801 . Although not shown in the figure, the base station 801 may operate according to the RIM protocol mode received from the server 803 after step 849 .

9 illustrates another example of operations of a base station and a server according to H-RIM according to various embodiments of the present disclosure.

Specifically, FIG. 9 illustrates a process in which the base station 901 operating in the C-RIM protocol mode operates according to the D-RIM protocol. Although only the base station 901 is shown in FIG. 9 , other base stations communicating with the base station 901 and the server 903 may exist. The server 903 may perform communication with the base station 901 and other base stations, and may serve to control interference between the base station 901 and other base stations.

Referring to FIG. 9 , in step 911, the base station 901 may set the default mode of the H-RIM protocol to the C-RIM protocol mode. The basic mode may mean a mode in which a base station operating according to the H-RIM protocol mode initially operates. C-RIM or D-RIM may exist in the basic mode. As the RIM protocol mode is set to C-RIM, the base station 901 may operate according to C-RIM. The operation according to the C-RIM may correspond to the operation of the base station 410 described above in FIG. 4 .

In step 913 , the base station 901 may transmit a remote interference management-reference signal (RIM-RS) to and receive from another base station to identify remote interference. The RIM-RS may be a reference signal for identifying information about long-distance interference exchanged between base stations. The RIM-RS may be a signal that is mutually transmitted and received between the base stations according to a method designated between the base stations.

In step 915 , the base station 901 may transmit a RIM-RS reception information report to the server 903 . The RIM-RS reception information report may be identified based on the RIM-RS transmitted and received by the base station 901 in step 913 . The RIM-RS reception information report may include information indicating the degree of interference that the base station 901 has on other base stations and the degree of interference that the base station 901 receives from other base stations. Specifically, after transmitting and receiving a predetermined RIM-RS, the base station 901 may identify the RIM-RS reception information report through calculation of a correlation coefficient.

In step 917 , the server 903 may perform a reciprocity test for each base station. The bidirectional test may be a test for determining whether the RI generation pattern is bidirectional or unidirectional between base stations. To perform the interactivity test, the server 903 may calculate the total channel capacity loss that the base station 901 causes as an attacker base station and the total channel capacity loss it receives as a victim base station. The server 903 compares the total channel capacity loss that the base station 901 causes as the attacker base station with the total channel capacity loss received as the victim base station, thereby generating a reciprocal RI between the base station 901 and another base station. can determine whether or not For example, when the smaller of the total channel capacity loss generated by the attacker base station and the total channel capacity loss received as the victim base station is more than half of the larger value, it can be determined that the RI generation pattern is bidirectional. For another example, if the smaller of the total channel capacity loss value generated by the attacker base station and the total channel capacity loss value received as the victim base station is less than half of the larger value, it is determined that the RI generation pattern is unidirectional. can

In step 919, the server 903 selects a RIM protocol mode suitable for a base station operating according to the H-RIM protocol mode among the base station 901 and other base stations according to the result of performing the interactivity test performed in step 917. can decide For example, when it is determined that the RI generation aspect of the base station is bidirectional as a result of the test, the server 903 may determine that the base station 901 operates as a D-RIM. For another example, when it is determined that the RI generation aspect of the base station is unidirectional as a result of the test, the server 903 may determine that the base station 901 operates as a C-RIM.

In step 921 , the server 903 may determine whether to mute a base station operating in the C-RIM protocol mode among the base station 901 and other base stations.

In step 923, the server 903 may transmit a RIM-RS to and receive a RIM-RS from another base station while performing steps 917, 919 and 921. In other words, while the server determines the next RIM protocol mode of the base station, it can continue to operate as C-RIM.

In step 925 , the server 903 may transmit the RIM protocol mode determined in step 919 to the base station 901 . As shown in FIG. 9 , the server 903 may transmit signaling for operating in the D-RIM protocol mode to the base station 901 .

In step 927 , the server 903 may notify whether the base station 901 is muted according to the result determined in step 921 . For example, when the server 903 determines that the base station 901 performs muting in step 921 , the server 903 may transmit signaling for applying the muting to the base station 901 . For another example, if the server 903 determines that the base station 901 does not need to perform muting in step 921, the server 903 may not transmit a signaling for applying the muting to the base station 901. there is.

In step 929 , the base station 901 may transmit a RIM-RS to and receive a RIM-RS from another base station.

In step 931 , the base station 901 may apply muting when receiving a signaling for applying muting from the server 903 .

Operations after step 933 may be operations of the base station according to the D-RIM protocol mode. In step 933 , the base station 901 may switch the RIM protocol mode to the D-RIM protocol mode.

In step 935 , the base station 901 may transmit a RIM-RS to and receive a RIM-RS from another base station. The RIM-RS may be a reference signal for identifying information about long-distance interference exchanged between base stations. The RIM-RS may be a signal that is mutually transmitted and received between the base stations according to a method designated between the base stations.

In step 937, the base station 901 may determine whether to apply muting by itself. When the base station decides to apply muting, the base station may apply muting by itself. Specifically, the base station may apply muting when the amount of channel capacity reduction due to the RI signals received from each base station is greater than the channel capacity of the base station that decreases when muting is applied. Since the D-RIM protocol does not require server intervention, that is, it does not require signaling with the server, it is possible to apply muting faster than C-RIM.

In step 939 , the base station 901 may transmit a RIM-RS reception information report to the server 903 . The RIM-RS reception information report may be identified based on the RIM-RS transmitted and received by the base station 901 in step 935 . The RIM-RS reception information report may include information indicating the degree of interference that the base station 901 has on other base stations and the degree of interference that the base station 901 receives from other base stations. Specifically, after transmitting and receiving a predetermined RIM-RS, the base station 901 may identify the RIM-RS reception information report through calculation of a correlation coefficient.

In step 941 , the server 903 may perform an interactivity test of the base station 901 and another base station. The bidirectional test may be a test for determining whether the RI generation pattern is bidirectional or unidirectional between base stations. To perform the interactivity test, the server 903 may calculate the total channel capacity loss that the base station 901 causes as an attacker base station and the total channel capacity loss it receives as a victim base station. The server 903 compares the total channel capacity loss that the base station 901 causes as the attacker base station with the total channel capacity loss received as the victim base station, thereby generating a reciprocal RI between the base station 901 and another base station. can determine whether or not For example, when the smaller of the total channel capacity loss generated by the attacker base station and the total channel capacity loss received as the victim base station is more than half of the larger value, it can be determined that the RI generation pattern is bidirectional. For another example, if the smaller of the total channel capacity loss value generated by the attacker base station and the total channel capacity loss value received as the victim base station is less than half of the larger value, it is determined that the RI generation pattern is unidirectional. can

In step 943, the server 903 determines, according to the result of the interactivity test performed in step 941, a RIM protocol mode suitable for the base station 901 and other base stations operating in the H-RIM protocol mode. can For example, when it is determined that the RI generation aspect of the base station is bidirectional as a result of the test, the server 903 may determine that the base station 901 operates as a D-RIM. For another example, when it is determined that the RI generation aspect of the base station is unidirectional as a result of the test, the server 903 may determine that the base station 901 operates as a C-RIM.

In step 945, the server 903 may determine muting of base stations operating in the C-RIM protocol.

The base station 901 may operate according to the D-RIM protocol mode while the server 903 performs steps 941 , 943 , and 945 . In other words, in step 947, the RIM-RS may be transmitted to another base station and the RIM-RS may be received from the other base station. Also, in step 949 muting of the base station 901 may be determined and the muting may be applied accordingly.

In step 951 , the server 903 may transmit the RIM protocol mode of the base station 901 according to the determination result of step 943 . Although not shown in the figure, the base station 901 may operate according to the RIM protocol mode received from the server 903 after step 951 .

10 illustrates another example of operations of a base station and a server according to H-RIM according to various embodiments of the present disclosure.

Specifically, FIG. 10 illustrates a process in which the base station 1001 operating in the C-RIM protocol mode operates according to the D-RIM protocol. Although only the base station 1001 is illustrated in FIG. 10 , other base stations communicating with the base station 1001 and the server 1003 may exist. The server 1003 may perform communication with the base station 1001 and other base stations, and may serve to control interference between the base station 1001 and other base stations. Unlike the H-RIM protocol operation illustrated in FIG. 9 , in the embodiment illustrated in FIG. 10 , the D-RIM protocol operation may be performed again after receiving a notification from the server of whether muting has been performed during the D-RIM protocol operation.

Referring to FIG. 10 , in step 1011 , the base station 1001 may set the default mode of the H-RIM protocol to the C-RIM protocol mode. The basic mode may mean a mode in which a base station operating according to the H-RIM protocol mode initially operates. C-RIM or D-RIM may exist in the basic mode. As the RIM protocol mode is set to C-RIM, the base station 1001 may operate according to C-RIM. The operation according to the C-RIM may correspond to the operation of the base station 410 described above in FIG. 4 .

In step 1013 , the base station 1001 may transmit and receive a remote interference management-reference signal (RIM-RS) to and from another base station to identify remote interference. The RIM-RS may be a reference signal for identifying information about long-distance interference exchanged between base stations. The RIM-RS may be a signal that is mutually transmitted and received between the base stations according to a method designated between the base stations.

In step 1015 , the base station 1001 may transmit a RIM-RS reception information report to the server 1003 . The RIM-RS reception information report may be identified based on the RIM-RS transmitted and received by the base station 1001 in step 1013 . The RIM-RS reception information report may include information indicating the degree of interference that the base station 1001 has on other base stations and the degree of interference that the base station 1001 receives from other base stations. Specifically, the base station 1001 may identify the RIM-RS reception information report by calculating a correlation coefficient after transmitting and receiving a predetermined RIM-RS.

In step 1017, the server 1003 may perform a reciprocity test for each base station. The bidirectional test may be a test for determining whether the RI generation pattern is bidirectional or unidirectional between base stations. To perform the interactivity test, the server 1003 may calculate the total channel capacity loss that the base station 1001 causes as an attacker base station and the total channel capacity loss it receives as a victim base station. The server 1003 compares the total channel capacity loss that the base station 1001 causes as the attacker base station with the total channel capacity loss it receives as the victim base station, thereby generating a reciprocal RI between the base station 1001 and another base station. can determine whether or not For example, when the smaller of the total channel capacity loss generated by the attacker base station and the total channel capacity loss received as the victim base station is more than half of the larger value, it can be determined that the RI generation pattern is bidirectional. For another example, if the smaller of the total channel capacity loss value generated by the attacker base station and the total channel capacity loss value received as the victim base station is less than half of the larger value, it is determined that the RI generation pattern is unidirectional. can

In step 1019, the server 1003 may determine a RIM protocol mode suitable for a base station operating according to the H-RIM protocol mode among the base station 1001 and other base stations according to the result of performing the interactivity test performed in step 1017. there is. For example, if it is determined that the RI generation aspect of the base station is bidirectional as a result of the test, the server 1003 may determine that the base station 1001 operates as a D-RIM. As another example, when it is determined that the RI generation aspect of the base station is unidirectional as a result of the test, the server 1003 may determine that the base station 1001 operates as a C-RIM.

In step 1021 , the server 1003 may determine whether to mute a base station operating in the C-RIM protocol mode among the base station 1001 and other base stations.

In step 1023, the server 1003 may transmit a RIM-RS to and receive a RIM-RS from another base station while performing steps 1017, 1019 and 1021. In other words, while the server determines the next RIM protocol mode of the base station, it can continue to operate as C-RIM.

In step 1025 , the server 1003 may transmit the RIM protocol mode determined in step 1019 to the base station 1001 . As shown in FIG. 10 , the server 1003 may transmit signaling for operating in the D-RIM protocol mode to the base station 1001 .

In step 1027 , the server 1003 may notify whether the base station 1001 is muted according to the result determined in step 1021 . For example, when the server 1003 determines that the base station 1001 performs muting in step 1021 , the server 1003 may transmit signaling for applying the muting to the base station 1001 . As another example, if the server 1003 determines that the base station 1001 does not need to perform muting in step 1021, the server 1003 may not transmit a signaling for applying muting to the base station 1001. there is.

In step 1029, the base station 1001 may transmit the RIM-RS to another base station and receive the RIM-RS from the other base station.

In step 1031 , the base station 1001 may apply muting when receiving a signaling for applying muting from the server 1003 .

Operations after step 1033 may be operations of the base station according to the D-RIM protocol mode. In step 1033, the base station 1001 may switch the RIM protocol mode to the D-RIM protocol mode.

In step 1035 , the base station 1001 may transmit a RIM-RS to another base station and may receive a RIM-RS from the other base station. The RIM-RS may be a reference signal for identifying information about long-distance interference exchanged between base stations. The RIM-RS may be a signal that is mutually transmitted and received between the base stations according to a method designated between the base stations.

In step 1037, the base station 1001 may determine whether to apply muting by itself. When the base station decides to apply muting, the base station may apply muting by itself. Specifically, the base station may apply muting when the amount of channel capacity reduction due to the RI signals received from each base station is greater than the channel capacity of the base station that decreases when muting is applied. Since the D-RIM protocol does not require server intervention, that is, it does not require signaling with the server, it is possible to apply muting faster than C-RIM.

In step 1039 , the base station 1001 may transmit a RIM-RS reception information report to the server 1003 . The RIM-RS reception information report may be identified based on the RIM-RS transmitted and received by the base station 1001 in step 1035 . The RIM-RS reception information report may include information indicating the degree of interference that the base station 1001 has on other base stations and the degree of interference that the base station 1001 receives from other base stations. Specifically, the base station 1001 may identify the RIM-RS reception information report by calculating a correlation coefficient after transmitting and receiving a predetermined RIM-RS.

In step 1041 , the server 1003 may perform an interactivity test of the base station 1001 and another base station. The bidirectional test may be a test for determining whether the RI generation pattern is bidirectional or unidirectional between base stations. To perform the interactivity test, the server 1003 may calculate the total channel capacity loss that the base station 1001 causes as an attacker base station and the total channel capacity loss it receives as a victim base station. The server 1003 compares the total channel capacity loss that the base station 1001 causes as the attacker base station with the total channel capacity loss it receives as the victim base station, thereby generating a reciprocal RI between the base station 1001 and another base station. can determine whether or not For example, when the smaller of the total channel capacity loss generated by the attacker base station and the total channel capacity loss received as the victim base station is more than half of the larger value, it can be determined that the RI generation pattern is bidirectional. For another example, if the smaller of the total channel capacity loss value generated by the attacker base station and the total channel capacity loss value received as the victim base station is less than half of the larger value, it is determined that the RI generation pattern is unidirectional. can

In step 1043, the server 1003 determines a RIM protocol mode suitable for a base station operating in the H-RIM protocol mode among the base station 1001 and other base stations according to the result of the interactivity test performed in step 1041. can For example, if it is determined that the RI generation aspect of the base station is bidirectional as a result of the test, the server 1003 may determine that the base station 1001 operates as a D-RIM. As another example, when it is determined that the RI generation aspect of the base station is unidirectional as a result of the test, the server 1003 may determine that the base station 1001 operates as a C-RIM.

In step 1045 , the server 1003 may determine muting of base stations operating in the C-RIM protocol. The base station 1001 may operate according to the D-RIM protocol mode while the server 1003 performs steps 1041, 1043, and 1045. In other words, in step 1047 , the RIM-RS may be transmitted to and received from another base station, and based on this, muting of the base station 1001 may be determined in step 1049 based on the muting operation. can be applied.

In step 1051 , the server 1003 may notify the base station 1001 of whether to perform muting according to the result determined in step 1045 . For example, when muting of the base station 1001 is determined, signaling for applying muting to the base station 1001 may be transmitted. For another example, when it is determined that muting of the base station 1001 is not necessary, signaling for applying muting to the base station 1001 may not be performed.

In step 1053 , the base station 1001 may apply muting according to the result notified in step 1051 . For example, when muting is notified from the server 1003 in step 1051 , the base station 1001 may apply the muting. For another example, although not shown in the drawing, when muting is not notified from the server 1003 in step 1051 , the base station 1001 may not apply muting.

In step 1055, the base station 1001 may transmit a RIM-RS to another base station and receive a RIM-RS signal from the other base station.

In step 1057, the base station 1001 may determine whether to apply muting by itself, based on the transmitted/received RIM-RS. If you decide to apply muting, you can apply muting. If it is decided not to apply muting, muting may not be applied.

In step 1059 , the server 1003 may transmit the RIM protocol mode of the base station 1001 according to the determination result of step 1043 . Although not shown in the figure, the base station 1001 may operate according to the RIM protocol mode received from the server 1003 after step 1059 .

11 illustrates another example of operations of a base station and a server according to H-RIM according to various embodiments of the present disclosure.

Specifically, FIG. 11 illustrates a process in which the base station 1101 operating in the D-RIM protocol mode switches to the C-RIM protocol mode as it is. Although only the base station 1101 is shown in FIG. 11 , other base stations communicating with the base station 1101 and the server 1103 may exist. The server 1103 may communicate with the base station 1101 and other base stations, and may indicate the RIM protocol mode of the base station 1101 and other base stations.

Referring to FIG. 11 , in step 1111 , the base station 1101 may determine the basic mode of the RIM protocol mode as the D-RIM protocol mode. The basic mode may mean a mode in which a base station operating according to the H-RIM protocol mode initially operates. C-RIM or D-RIM may exist in the basic mode. As the RIM protocol mode is set to D-RIM, the base station 1101 may operate according to D-RIM. The operation according to the D-RIM may correspond to the operation of the base station 510 described above in FIG. 5 .

In step 1113 , the base station 1101 may transmit a RIM-RS to another base station and may receive a RIM-RS from the other base station. The RIM-RS may be a reference signal for identifying information about long-distance interference exchanged between base stations. The RIM-RS may be a signal that is mutually transmitted and received between the base stations according to a method designated between the base stations.

In step 1115 , the base station 1101 may determine whether to apply muting by itself. When the base station decides to apply muting, the base station may apply muting by itself. Specifically, the base station may apply muting when the amount of channel capacity reduction due to the RI signals received from each base station is greater than the channel capacity of the base station that decreases when muting is applied. Since the D-RIM protocol does not require server intervention, that is, it does not require signaling with the server, it is possible to apply muting faster than C-RIM.

In step 1117 , the base station 1101 may transmit a RIM-RS reception information report to the server 1103 . The RIM-RS reception information report may be identified based on the RIM-RS transmitted and received by the base station 1101 in step 1113 . The RIM-RS reception information report may include information indicating the degree of interference that the base station 1101 has on other base stations and the degree of interference that the base station 1101 receives from other base stations. Specifically, after transmitting and receiving a predetermined RIM-RS, the base station 1101 may identify the RIM-RS reception information report through calculation of a correlation coefficient.

In step 1119 , the server 1103 may perform an interactivity test of the base station 1101 and another base station. The bidirectional test may be a test for determining whether the generation of RI is bidirectional or unidirectional between base stations. To perform the interactivity test, the server 1103 may calculate the total channel capacity loss that the base station 1101 causes as an attacker base station and the total channel capacity loss it receives as a victim base station. The server 1103 compares the total channel capacity loss caused by the base station 1101 as the attacker base station with the total channel capacity loss received as the victim base station, thereby generating a reciprocal RI between the base station 1101 and another base station. can determine whether or not For example, when the smaller of the total channel capacity loss value generated by the attacker base station and the total channel capacity loss value received as the victim base station is more than half of the larger value, it can be determined that the RI generation pattern is bidirectional. For another example, if the smaller of the total channel capacity loss value generated by the attacker base station and the total channel capacity loss value received as the victim base station is less than half of the larger value, it is determined that the RI generation pattern is unidirectional. can

In step 1121, the server 1103 determines a RIM protocol mode suitable for a base station operating in the H-RIM protocol mode among the base station 1101 and other base stations according to the result of the interactivity test performed in step 1119. can For example, if it is determined that the RI generation aspect of the base station is bidirectional as a result of the test, the server 1103 may determine that the base station 1101 operates as a D-RIM. For another example, when it is determined that the RI generation aspect of the base station is unidirectional as a result of the test, the server 1103 may determine that the base station 1101 operates as a C-RIM.

In step 1123 , the server 1103 may determine whether to mute a base station operating in the C-RIM protocol mode among the base station 1101 and other base stations. Specifically, the server 1103 determines the muting of the base station 1101 when the total channel capacity reduction due to the interference of the victim base stations is greater than the channel capacity that decreases when muting is applied to the base station 1101. there is.

While the server 1103 performs steps 1119 , 1121 , and 1123 , the base station 1101 may operate according to the D-RIM protocol mode. For example, in step 1125 , the base station 1101 may transmit a RIM-RS to and receive a RIM-RS from another base station. In step 1127, the base station 1101 may determine muting by itself based on the transmitted and received RIM-RS. If you decide to mute, you can apply muting.

In step 1129 , the server 1103 may transmit the RIM protocol mode to the base station 1101 . For example, the server 1103 may transmit to the base station 1101 to operate in the C-RIM protocol mode.

In step 1131 , the base station 1101 receiving the C-RIM protocol mode may switch from the D-RIM protocol mode to the C-RIM protocol mode.

In step 1133 , the base station 1101 may transmit a remote interference management-reference signal (RIM-RS) to, and receive from, another base station in order to identify remote interference. The RIM-RS may be a reference signal for identifying information about long-distance interference exchanged between base stations. The RIM-RS may be a signal that is mutually transmitted and received between the base stations according to a method designated between the base stations.

In step 1135 , the base station 1101 may transmit a RIM-RS reception information report to the server 1103 . The RIM-RS reception information report may be identified based on the RIM-RS received by the base station 1101 in step 1133 . The RIM-RS reception information report may include information indicating the degree of interference that the base station 1101 has on other base stations and the degree of interference that the base station 1101 receives from other base stations. Specifically, after receiving the predetermined RIM-RS, the base station 1101 may identify the RIM-RS reception information report through calculation of a correlation coefficient.

In step 1137, the server 1103 may perform a reciprocity test for each base station. The bidirectional test may be a test for determining whether the RI generation pattern is bidirectional or unidirectional between base stations. To perform the interactivity test, the server 1103 may calculate the total channel capacity loss that the base station 1101 causes as an attacker base station and the total channel capacity loss it receives as a victim base station. The server 1103 compares the total channel capacity loss caused by the base station 1101 as the attacker base station with the total channel capacity loss received as the victim base station, thereby generating a reciprocal RI between the base station 1101 and another base station. can determine whether or not For example, when the smaller of the total channel capacity loss generated by the attacker base station and the total channel capacity loss received as the victim base station is more than half of the larger value, it can be determined that the RI generation pattern is bidirectional. For another example, if the smaller of the total channel capacity loss value generated by the attacker base station and the total channel capacity loss value received as the victim base station is less than half of the larger value, it is determined that the RI generation pattern is unidirectional. can

In step 1139, the server 1103 selects a RIM protocol mode suitable for a base station operating according to the H-RIM protocol mode among the base station 1101 and other base stations according to the result of performing the interactivity test performed in step 1137. can decide For example, if it is determined that the RI generation aspect of the base station is bidirectional as a result of the test, the server 1103 may determine that the base station 1101 operates as a D-RIM. For another example, when it is determined that the RI generation aspect of the base station is unidirectional as a result of the test, the server 1103 may determine that the base station 1101 operates as a C-RIM.

In step 1141 , the server 1103 may determine whether to mute the base station 1101 and other base stations operating in the C-RIM protocol mode.

In step 1143, while the server 1103 performs steps 1137, 1139 and 1141, the base station 1101 may transmit RIM-RS to and receive RIM-RS from other base stations. In other words, while the server determines the next RIM protocol mode of the base station, it can continue to operate as C-RIM.

In step 1145 , the server 1103 may transmit the RIM protocol mode determined in step 1139 to the base station 1101 .

In step 1147 , the server 1103 may notify whether the base station 1101 is muted according to the result determined in step 1121 . For example, when the server 1103 determines that the base station 1101 performs muting in step 1141 , the server 1103 may transmit signaling for applying the muting to the base station 1101 . As another example, when the server 1103 determines that the base station 1101 does not need to perform muting in step 1141, the server 1103 may not transmit a signaling for applying muting to the base station 1101. there is.

In step 1149, the base station 1101 may transmit a RIM-RS to another base station and receive a RIM-RS from another base station.

In step 1151 , the base station 1101 may apply muting when receiving a signaling for applying muting from the server 1103 .

Although not shown in the figure, the base station 1101 may operate according to the RIM protocol mode received from the server 1103 after step 45 .

12A illustrates a functional configuration of a server and a base station apparatus according to C-RIM according to various embodiments of the present disclosure. The functional configuration of the base station 1210 shown in FIG. 12A shows the functional configuration of the processor 240 of FIG. 2A . The functional configuration of the server 1220 shown in FIG. 12A shows the functional configuration of the processor 270 in FIG. 2B .

Referring to FIG. 12A , the base station 1210 may include a RIM-RS transceiver 1211 , a RIM-RS reception report transmitter 1213 , and a muting or not receiving and applying unit 1215 . The RIM-RS transceiver 1211 may transmit a RIM-RS to another base station and receive a RIM-RS from the other base station. The RIM-RS reception report transmitter 1213 may transmit the RIM-RS reception report identified based on the RIM-RS to the server. In addition, the muting status reception and application unit 1215 may receive the muting status transmitted from the server 1220 .

The server 1220 may include a RIM-RS reception report receiving unit 1221 , a muting or not determining unit 1223 for each base station, and a muting or not notification unit 1225 . The RIM-RS reception report reception unit 1221 may receive the RIM-RS reception report transmitted from the RIM-RS reception report transmission unit 1213 of the base station 1210 . Based on the RIM-RS reception report received by the RIM-RS reception report reception unit 1221 , the muting determination unit 1223 for each base station may determine whether to apply muting for each base station. The muting notifying unit 1225 may notify the base station 1210 of whether to perform muting according to a result determined by the muting or not determining unit 1223 for each base station.

12B illustrates a functional configuration of a base station according to D-RIM according to various embodiments of the present disclosure. The functional configuration of the base station 1230 shown in FIG. 12B shows the functional configuration of the processor 240 of FIG. 2A .

Referring to FIG. 12B , a base station 1230 may exist, and the base station 1230 may be the same base station as the base station 1210 shown in FIG. 12A and FIG. 1240 shown in FIG. 12C .

As shown in FIG. 12B , the base station 1230 may include a RIM-RS transceiver, a muting or not determining unit 1233 , and a muting applying unit 1235 . The RIM-RS transceiver 1231 may transmit a RIM-RS to another base station and may receive a RIM-RS from another base station. The muting or not determining unit 1233 may determine whether to perform muting by the base station 1230 itself, based on the received RIM-RS. The muting application unit 1235 may apply muting according to the result determined by the muting or not determining unit 1233 .

12C illustrates functional configurations of a server and a base station apparatus according to an H-RIM protocol mode according to various embodiments of the present disclosure. The functional configuration of the base station 1240 shown in FIG. 12C shows the functional configuration of the processor 240 of FIG. 2A . The functional configuration of the server 1250 shown in FIG. 12A shows the functional configuration of the processor 270 of FIG. 2B .

Referring to FIG. 12C , a base station 1240 and a server 1250 communicating with the base station may exist. The base station 1240 may be the same base station as the base station 1210 of FIG. 12A and the base station 1230 of FIG. 12B . The server 1250 may be the same server as the server 1220 of FIG. 12A .

The base station 1240 may include a RIM-RS transceiver 1241 , a RIM-RS reception report transmission unit 1243 , and a RIM protocol mode reception and application unit 1245 . The RIM-RS transceiver 1241 may transmit a RIM-RS to another base station and may receive a RIM-RS from another base station. The RIM-RS reception report transmitter 1243 may identify the RIM-RS reception report based on the RIM-RS transmitted and received by the RIM-RS transceiver 1241 and transmit it to the server. The RIM protocol mode receiving and applying unit 1245 may receive the RIM protocol mode from the server 1250 and apply it.

The server 1250 may include a RIM-RS reception report receiving unit 1251 , a bidirectional determining unit 1253 , a RIM protocol mode determining unit 1255 , and a RIM protocol mode transmitting unit 1257 . The RIM-RS reception report receiver may receive the RIM-RS reception report transmitted from the base station 1240 . The bidirectional determining unit 1253 may perform a bidirectional test for long-distance interference between base stations so that the RIM protocol mode determining unit 1255 can determine which RIM protocol mode is suitable for the base station. The RIM protocol mode determining unit 1255 may determine the RIM protocol mode of the base station 1240 according to the test result performed by the bidirectional determining unit 1253 . The RIM protocol mode transmitter 1257 may transmit the RIM protocol mode of the base station 1240 determined by the RIM protocol mode determiner 1255 to the base station 1240 .

13 illustrates an operation flow of a base station and a server according to an H-RIM protocol mode using location information of a base station according to various embodiments of the present disclosure.

In the H-RIM protocol, when a server performs a bidirectional test between a base station and another base station using RIM-RS, despite long-range interference occurring due to propagation delay of RIM-RS or low received SINR performance of the base station , the RIM-RS for identifying it may not be detected. In addition, since long-distance interference occurs between a plurality of base stations, when the server identifies a pattern of occurrence of far-range interference with respect to one base station, the bidirectional RI and the unidirectional RI may be simultaneously observed. In order to correct the ambiguity of the RI generation aspect, geographically adjacent base stations may be set as one group on the premise that they are affected by the same RI when the RI occurs. The H-RIM group mode switching may determine the bidirectionality of the occurrence of long-range interference between the groups configured as described above, and a suitable RIM protocol may be applied according to the pattern of occurrence of long-range interference between groups.

13 shows an example of the H-RIM group mode switching process described above. Although only the base station 1301 and the server 1303 are shown in the drawing, there may be multiple base stations communicating with the base station 1301 and the server 1303 .

In step 1311 , the base station 1301 may transmit a remote interference management-reference signal (RIM-RS) to, and receive from, another base station in order to identify remote interference. The RIM-RS may be a reference signal for identifying information about long-distance interference exchanged between base stations. The RIM-RS may be a signal that is mutually transmitted and received between the base stations according to a method designated between the base stations.

In step 1313 , the base station 1301 and other base stations may transmit a RIM-RS reception information report to the server 1303 based on the received RIM-RS signal. The RIM-RS reception information reported by the base station 1301 to the server 1303 may include information indicating the degree of interference that the base station 1301 has on other base stations and the degree of interference that the base station 1301 receives from other base stations. there is. Specifically, after transmitting a predetermined RIM-RS, the base station 1301 may identify RIM-RS reception information by calculating a correlation coefficient.

In step 1315 , the base station 1301 may transmit the location information report of the base station 1301 to the server 1303 . The location information report of the base station 1301 may include information related to the geographic location of the base station and information about an adjacent base station.

In step 1317 , the server 1303 may group adjacent base stations based on the base station location information report received from the base station 1301 . Grouping may be performed based on the location information report. At least one base station may be included in each group according to grouping, and the number of base stations included in each group may be the same or different. In some cases, a base station located at a certain distance and another base station may be grouped into the same group or may be grouped into a different group.

In step 1319 , the server 1303 may perform a bidirectional test for each base station group according to the grouping result in step 1317 . The bidirectional test may be a test for determining whether the RI generation pattern is bidirectional or unidirectional between base stations. In order to perform the interactivity test, the server 1320 may calculate the total channel capacity loss that the base station 1310 causes as an aggressor base station and the total channel capacity loss that the base station 1310 receives as a victim base station. The server 1320 compares the total channel capacity loss that the base station 1310 generates as the attacker base station with the total channel capacity loss received as the victim base station, thereby generating a reciprocal RI between the base station 1310 and another base station. can determine whether or not For example, when the smaller of the total channel capacity loss value generated by the attacker base station and the total channel capacity loss value received as the victim base station is more than half of the larger value, it can be determined that the RI generation pattern is bidirectional. For another example, if the smaller of the total channel capacity loss value generated by the attacker base station and the total channel capacity loss value received as the victim base station is less than half of the larger value, it is determined that the RI generation pattern is unidirectional. can In an embodiment, the interactivity test performed by the server 1320 may be performed based on Equations 1, 2, and 3 described above.

In step 1307 , the server 1320 may determine a RIM protocol mode suitable for the base station 1310 according to the result of performing the interactivity test performed in step 1305 . For example, when it is determined that the RI generation pattern between the base station 1310 and another base station is bidirectional as a result of the test, the server 1320 may determine that the base station 1310 operates in the D-RIM protocol mode. For another example, when it is determined that the RI generation pattern between the base station 1310 and another base station is unidirectional as a result of the test, the server 1320 may determine that the base station 1310 operates in the C-RIM protocol mode.

In step 1309 , the server 1320 may transmit the RIM protocol mode determined in step 1307 to the base station 1310 . For example, when the server 1320 determines that the base station 1310 operates in the D-RIM protocol mode, the server 1320 may transmit the D-RIM protocol mode to the base station 1310 . As another example, the server 1320 may transmit the C-RIM protocol mode when it is determined that the base station 1310 operates in the C-RIM protocol mode.

In step 1311 , the base station 1310 may maintain the set RIM protocol mode or switch to another RIM protocol mode according to the RIM protocol mode received from the server 1320 . For example, a base station operating in the C-RIM protocol mode may maintain the C-RIM protocol mode or perform switching to the D-RIM protocol mode. As another example, in the case of a base station operating in the D-RIM protocol mode, switching to the C-RIM protocol mode may be performed or the D-RIM protocol mode may be maintained.

According to the far-field interference control protocol according to the apparatus and method for mitigating far-field interference according to various embodiments of the present disclosure, it has higher performance compared to the conventional method for mitigating far-field interference. Specifically, 432 hour RI data in 1 hour units generated between 2547 cells is used, and data corresponding to 20 minutes and 40 minutes of each hour are randomly generated using data from before and after times. As a result of measuring the available channel capacity for each base station when the RIM protocol is applied, it can be confirmed that the RIM protocol has high performance.

Table 4 summarizes the percentage of base stations having higher available channel capacity when operating in the RIM protocol mode of the corresponding row than when operating in the RIM protocol mode of the corresponding column. Through this, it can be confirmed that the H-RIM protocol mode obtains better performance than the case of operating only the C-RIM protocol mode and the D-RIM protocol mode by operating an appropriate RIM protocol according to the RI aspect.

vs. C-RIM protocol vs. D-RIM protocol vs. H-RIM protocol C-RIM protocol - 48.67 33.21 D-RIM protocol 51.33 - 48.20 H-RIM protocol 66.79 51.80 -

The method of operating a base station according to various embodiments of the present disclosure as described above includes a process of receiving a remote interference management reference signal (RIM-RS) from at least one other base station, based on the RIM-RS to identify remote interference (RI) from the at least one other base station, and the process of applying muting based on the RI and the channel capacity of the base station.

In an embodiment, the process of applying muting based on the RI and the channel capacity of the base station is performed based on the following equation,

In the above equation, S is the transmit power, N is the noise signal power, I _i ^v is the power of the RI generated by the i -th base station, loss _i ^v may mean a decrease amount of the channel capacity of the i-th base station, and α may mean a muting index.

In an embodiment, the RIM-RS is simultaneously received from the at least one other base station, and the process of applying muting based on the RI and the channel capacity of the base station is performed based on the following equation,

In the above equation, S is transmit power, N is noise signal power, I _i ^v is the RI power generated by the i -th base station, and α may mean a muting index.

In an embodiment, the method of operating the base station further comprises transmitting RIM-RS reception information to a server and receiving RIM mode information from the server, wherein the RIM mode information is the RIM-RS reception information can be determined based on

In an embodiment, the method of operating the base station may further include receiving a muting instruction from the server and applying muting according to the muting instruction.

In an embodiment, the method of operating the base station may further include maintaining or switching the RIM mode based on the received RIM mode information.

In an embodiment, the method of operating the base station further includes transmitting location information to the server, and the RIM mode information may be determined based on the RIM-RS reception information and the location information.

As described above, in the method of operating a server according to various embodiments of the present disclosure, a process of receiving a RIM-RS reception information report from a base station, and determining a RIM protocol mode of the base station based on the RIM-RS reception information report and transmitting the determined RIM protocol mode to the base station.

In an embodiment, the method of operating the base station may further include determining muting of the base station and transmitting a muting instruction to the base station.

In one embodiment, the process of determining the muting of the base station is determined based on the following equation,

In the above equation, S is the transmit power, N is the noise signal power, I ^a _i is the power of the RI generated by the aggressor base station to the i -th victim base station, α means the muting index, and the loss _i ^a is the i-th It may mean a decrease in channel capacity of the victim base station.

A base station apparatus according to various embodiments of the present disclosure includes a transceiver and at least one processor operatively connected to the transceiver, and the at least one processor is configured to receive a remote interference reference signal from at least one other base station. Receive an interference management reference signal, RIM-RS, and identify remote interference (RI) from the at least one other base station based on the RIM-RS, based on the RI and the channel capacity of the base station Thus, it may be a device configured to apply muting.

In an embodiment, the device may be configured to apply muting based on the RI and the channel capacity of the base station based on the following equation,

In the above equation, S is the transmit power, N is the noise signal power, I _i ^v is the RI power generated by the i -th base station, loss _i ^v is the decrease in the channel capacity of the i-th base station, and α is the muting index. can mean

In an embodiment, the device is configured to apply muting based on the RI and the channel capacity of the base station based on the following equation,

In the above equation, S is transmit power, N is noise signal power, I _i ^v is the RI power generated by the i -th base station, and α may mean a muting index.

In an embodiment, the device is configured to transmit RIM-RS reception information to a server and receive RIM mode information from the server, wherein the RIM mode information is a device determined based on the RIM-RS reception information. can

In an embodiment, the device may be a device further configured to receive a muting instruction from the server and apply muting according to the muting instruction.

In one embodiment, the device may be a device further configured to maintain or switch the RIM mode based on the received RIM mode information.

In an embodiment, the device may be further configured to transmit location information to the server, and the RIM mode information may be a device determined based on the RIM-RS reception information and the location information.

A server apparatus according to various embodiments of the present disclosure includes a transceiver and at least one processor operatively connected to the transceiver, wherein the at least one processor receives a RIM-RS reception information report from a base station and , based on the RIM-RS reception information report, determine the RIM protocol mode of the base station, and may be an apparatus configured to transmit the determined RIM protocol mode to the base station.

In an embodiment, the device may be a device further configured to determine muting of the base station and transmit a muting instruction to the base station.

In one embodiment, the device is configured to determine the muting of the base station based on the following equation,

In the above equation, S is the transmit power, N is the noise signal power, I ^a _i is the power of the RI generated by the aggressor base station to the i -th victim base station, α means the muting index, and the loss _i ^a is the i-th It may mean a decrease in channel capacity of the victim base station.

The various embodiments of this document and the terms used therein are not intended to limit the technical features described in this document to specific embodiments, and should be understood to include various modifications, equivalents, or substitutions of the embodiments. In connection with the description of the drawings, like reference numerals may be used for similar or related components. The singular form of the noun corresponding to the item may include one or more of the item, unless the relevant context clearly dictates otherwise. As used herein, "A or B", "at least one of A and B", "at least one of A or B", "A, B or C", "at least one of A, B and C", and "A , B, or C" each may include any one of the items listed together in the corresponding one of the phrases, or all possible combinations thereof. Terms such as "first", "second", or "first" or "second" may be used simply to distinguish the element from other elements in question, and may refer to elements in other aspects (e.g., importance or order) is not limited. It is said that one (eg, first) component is "coupled" or "connected" to another (eg, second) component, with or without the terms "functionally" or "communicatively". When referenced, it means that one component can be connected to the other component directly (eg by wire), wirelessly, or through a third component.

The term “module” used in various embodiments of this document may include a unit implemented in hardware, software, or firmware, for example, and interchangeably with terms such as logic, logic block, component, or circuit. can be used A module may be an integrally formed part or a minimum unit or a part of the part that performs one or more functions. For example, according to an embodiment, the module may be implemented in the form of an application-specific integrated circuit (ASIC).

According to various embodiments of the present document, one or more instructions stored in a storage medium (eg, internal memory 136 or external memory 138) readable by a machine (eg, electronic device 101) may be implemented as software (eg, the program 140) including For example, a processor (eg, processor 120 ) of a device (eg, electronic device 101 ) may call at least one command among one or more commands stored from a storage medium and execute it. This makes it possible for the device to be operated to perform at least one function according to the called at least one command. The one or more instructions may include code generated by a compiler or code executable by an interpreter. The device-readable storage medium may be provided in the form of a non-transitory storage medium. Here, 'non-transitory' only means that the storage medium is a tangible device and does not include a signal (eg, electromagnetic wave), and this term is used in cases where data is semi-permanently stored in the storage medium and It does not distinguish between temporary storage cases.

According to an embodiment, the method according to various embodiments disclosed in this document may be provided by being included in a computer program product. Computer program products may be traded between sellers and buyers as commodities. The computer program product is distributed in the form of a machine-readable storage medium (eg compact disc read only memory (CD-ROM)), or through an application store (eg Play Store™) or on two user devices ( It can be distributed online (eg download or upload), directly between smartphones (eg smartphones). In the case of online distribution, at least a part of the computer program product may be temporarily stored or temporarily generated in a machine-readable storage medium such as a memory of a server of a manufacturer, a server of an application store, or a relay server.

According to various embodiments, each component (eg, a module or a program) of the above-described components may include a singular or a plurality of entities, and some of the plurality of entities may be separately disposed in other components. . According to various embodiments, one or more components or operations among the above-described corresponding components may be omitted, or one or more other components or operations may be added. Alternatively or additionally, a plurality of components (eg, a module or a program) may be integrated into one component. In this case, the integrated component may perform one or more functions of each component of the plurality of components identically or similarly to those performed by the corresponding component among the plurality of components prior to the integration. . According to various embodiments, operations performed by a module, program, or other component are executed sequentially, in parallel, repeatedly, or heuristically, or one or more of the operations are executed in a different order, omitted, or , or one or more other operations may be added.

Claims (20)

In a wireless communication system of time division duplexing (TDD), an operating method of a base station,
The process of receiving a remote interference management reference signal (RIM-RS) from at least one other base station,
The process of identifying remote interference (RI) from the at least one other base station based on the RIM-RS, and
and applying muting based on the RI and the channel capacity of the base station.
In an embodiment, the process of applying muting based on the RI and the channel capacity of the base station is performed based on the following equation,
The method according to claim 1, wherein the process of applying muting based on the RI and the channel capacity of the base station is performed based on the following equation,

In the above equation, S is the transmit power, N is the noise signal power, I _i ^v is the power of the RI generated by the i -th base station, loss _i ^v is the amount of decrease in the channel capacity of the i-th base station, and α is the muting index.
The method according to claim 1, wherein the RIM-RS is simultaneously received from the at least one other base station,
The process of applying muting based on the RI and the channel capacity of the base station is performed based on the following equation,

In the above equation, S is the transmit power, N is the noise signal power, I _i ^v is the RI power generated by the i -th base station, and α is the muting index. The method according to claim 1, The process of transmitting RIM-RS reception information to the server;
Further comprising the step of receiving RIM mode information from the server,
The RIM mode information is determined based on the RIM-RS reception information.
The method of claim 4, wherein the step of receiving a muting instruction from the server;
The method further comprising the step of applying muting according to the muting instruction.
5. The method of claim 4,
The method further comprising the step of maintaining or switching the RIM mode based on the received RIM mode information.
The method according to claim 4, further comprising the step of transmitting location information to the server,
The RIM mode information is determined based on the RIM-RS reception information and the location information.
In a method of operating a server in a wireless communication system of time division duplexing (TDD),
The process of receiving the RIM-RS reception information report from the base station,
Based on the RIM-RS reception information report, the process of determining the RIM protocol mode of the base station,
and transmitting the determined RIM protocol mode to the base station.
The method according to claim 7, wherein the step of determining muting of the base station;
and transmitting a muting indication to the base station.
The method according to claim 8, wherein the process of determining the muting of the base station is determined based on the following equation,

In the above equation, S is the transmit power, N is the noise signal power, I ^a _i is the power of the RI generated by the aggressor base station to the i -th victim base station, α means the muting index, and the loss _i ^a is the i-th A method of implying the amount of channel capacity reduction of the victim base station.
In a wireless communication system of time division duplexing (TDD), in an apparatus of a base station,
transceiver; and
at least one processor;
The at least one processor comprises:
receive a remote interference management reference signal (RIM-RS) from at least one other base station;
identify remote interference (RI) from the at least one other base station based on the RIM-RS;
an apparatus configured to apply muting based on the RI and a channel capacity of the base station.
12. The method of claim 11, wherein the at least one processor comprises:
configured to apply muting based on the RI and the channel capacity of the base station based on the following equation,

In the above equation, S is the transmit power, N is the noise signal power, I _i ^v is the power of the RI generated by the i -th base station, loss _i ^v is a decrease in channel capacity of the i-th base station, and α is a muting index.
12. The method of claim 11, wherein the at least one processor comprises:
configured to apply muting based on the RI and the channel capacity of the base station based on the following equation,

In the above equation, S is the transmit power, N is the noise signal power, I _i ^v is the power of the RI generated by the i -th base station, and α means the muting index,
The RIM-RS is simultaneously received from the at least one other base station. The method of claim 11 , wherein the at least one processor comprises:
Sends RIM-RS reception information to the server,
configured to receive RIM mode information from the server;
The RIM mode information is a device that is determined based on the RIM-RS reception information.
The method of claim 14, wherein the at least one processor,
receiving a muting instruction from the server;
and apply muting according to the muting instruction.
The method of claim 14, wherein the at least one processor,
The apparatus further configured to maintain or switch the RIM mode based on the received RIM mode information.
The method of claim 14, wherein the at least one processor,
further configured to send location information to the server,
The RIM mode information is determined based on the RIM-RS reception information and the location information.
In a wireless communication system of time division duplexing (TDD), in a device of a server,
transceiver; and
At least one processor is included,
The at least one processor comprises:
Receive a RIM-RS reception information report from the base station;
based on the RIM-RS reception information report, determine a RIM protocol mode of the base station;
an apparatus configured to transmit the determined RIM protocol mode to the base station.
The method according to claim 17, wherein the at least one processor,
determining muting of the base station;
and send a muting indication to the base station.
19. The method of claim 18,
the at least one processor is configured to determine muting of the base station based on the following equation,

In the above equation, S is the transmit power, N is the noise signal power, I ^a _i is the power of the RI generated by the aggressor base station to the i -th victim base station, α means the muting index, and the loss _i ^a is the i-th A device that refers to the amount of channel capacity reduction of the victim base station.

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