BEAM DETECTION METHOD TO REDUCE CROSS-LINK INTERFERENCE (CLI)

Abstract

It is a method for detecting beamforming that causes cross-linking interference (CLI) between base stations (100) that can communicate using sub-band full-duplex (SBFD) technology and can perform transmit beamforming and receive beamforming.

Description

1 TARIFF BEAM DETECTION METHOD TO REDUCE CROSS-LINK INTERFERENCE (CLI) TECHNICAL AREA 5 The invention enables communication using lowerband full duplex (SBFD) technology. Detecting beam pairs that cause cross-linking interference (CLI) between stations. It relates to a method of transmission; here, the base stations in question are used for sending. It can perform beamforming and acquisition beamforming operations. 10 PREVIOUS TECHNIQUE Subband full duplex (SBFD) is a system where a device can display different subbands within the same frequency band. a wireless communication that enables simultaneous sending and receiving of signals over 15 It is a technique that allows the frequency band to be divided into separate subbands for transmission and reception. SBFD technology reduces self-interference (i.e., a device's reception of its own transmission). (the problem of affecting). This method is bidirectional without the need for additional frequency sources. It increases spectral efficiency and data transfer by enabling simultaneous communication. SBFD, It is particularly valuable in environments with limited spectrum availability and higher data 20 for use in next-generation networks like 5G to meet the increasing demand for their speeds Research is underway. The application of the SBFD technique is now an advanced method for managing the initiative. signal processing needs and hardware capable of simultaneous transmission and reception. This also brings with it challenges such as the need for... Despite these obstacles, SBFD is currently available. 25 has. Cross-Climate Initiative (CLI), for example, a wireless system with upstream and downstream channels. It is interference that occurs between different communication links in the system. Transmission and sub-band perfect even 30 where purchase transactions occur simultaneously across different sub-bands In techniques like directional (SBFD), the CLI causes interference between send and receive signals. It can reduce performance. CLI management, signal quality preservation and wireless networks. It is important for ensuring efficient communication. Another beam of light is unintentionally emitted. the initiating sender beam, the attacker beam, the beam generated by the attacker beam The buying stream affected by the intervention is defined as the victim stream. 35 2 In the current state of the art, the main components in sub-band full duplex (SBFD) systems are... One of the challenges is the effective implementation of cross-connection initiative (CLI) between gNodeBs (gNBs). CLI is managed in this way, especially in dense network deployments, both downstream (DL) and downstream (DL). This can significantly reduce the performance of upstream (UL) transmissions. Current methods, 5. Resource inefficiency and suboptimal performance in measuring and mitigating interference. It is difficult to cope. A scenario with multiple victims and attackers. No solution is found. Even when there is a single victim, the neighbor gNBs need to obtain beam pairs using reference signals. Each gNB must measure each Tx beam at each Rx beam of the other gNBs. When considered, this process is a very resource-intensive operation. This is not at all practical. 10 Better identification of victim and attacker pairs and only the necessary beam is directed. A smart solution is needed to obtain the pairs. In the current state of the art, CLI management is addressed through various approaches; these include among them spatial field techniques, power field techniques and coordinated timing-based 15 There are various techniques. These include spatial domain techniques, beam cancellation, and beam matching techniques. They are divided into two categories. Beam cancellation techniques involve gNBs (ghost bulbs) aligning their beams to prevent interference. It is generally directed at channels that require precise channel information and can be resource-intensive. It is applied where applicable at FR-1 frequencies. Periodic / semi-permanent / periodic Channel Status Information-Reference Signals (CSI-RS), 20 originating from specific beams For parasite measurement and reporting aimed at identifying and reducing parasites. It is usable. Previous beamforming techniques generated a high level of interference. obtaining pairs of beams and avoiding using these two beams simultaneously It relies on this. To make this possible, each potential attacker / neighboring base station must be CSI- There are some techniques that require RS signals to be transmitted orthogonally and adjacent to base 25. Considering the number of stations, one is transmitting while the others are listening. This is required, and this process is for each acquisition beam included in the neighboring list of each gNB. This needs to be repeated. Afterwards, the gNBs are selected from the beam that causes the most interference. By sharing the pairs and timing information of these beams with each other, it surpasses the high CLI. He is trying to pass. 30 Although effective in certain scenarios, the methods in the known state of the art have various characteristics. It has disadvantages and needs improvement. Periodic canal status CSI- Techniques such as beamforming / matching, which are performed using RS signal transmission, utilize symbols and Since it requires significant overhead in terms of the reference signal, the source is 35. It is intensive. Static TDD configurations and rigid beam coordination methods lack flexibility. They lack this, which makes them vulnerable to dynamic network conditions and variable interference patterns. 3 This makes them incompatible. Many methods, such as avoiding certain UL rays, especially above This leads to performance compromises that can negatively impact the overall quality of service on the connection. The need for real-time information exchange and coordination via the Xn interface is important. This can lead to significant delays and complexity, which necessitates a timely and effective CLI. This makes it difficult to carry out the necessary repairs. 5 US2024064539A1, specifically for 5G networks, uses dynamic time-division duplex (TDD). This invention addresses the CLI problem in systems involving adjacent radio access network (RAN) nodes. It proposes a method for measuring and managing CLI between all users. This approach applies to all users. the resource consumption caused by measuring possible beam pair combinations and 10 To reduce delay, only specific beam pairs are selected for CLI measurement. It includes coordination between the victim and attacker RAN nodes. The selected beam pairs are strategically chosen based on historical CLI data and spatial proximity. This allows for CLI measurement without significantly affecting the quality of the CLI report. The time and resources required are reduced. The method also allows the attacker to obtain reference 15 from the RAN. for the transmission of signals and then for better source and timing coordination To compile CLI reports shared between RANs, these signals are placed on the victim RAN. It involves measurement. US11233623B2, specifically designed for dynamic TDD and flexible duplex 20 in 5G / New Radio (NR) systems. focusing on the measurement and control of CLI in wireless communication networks. It addresses methods and systems for this purpose. The proposed solution includes CLI-RSRP, CLI-RSSI, and CLI- It includes techniques for measuring CLI using various metrics such as RSRQ. This Measurements can be performed using signals such as CSI-RS, DMRS, and SRS. The patent is suitable for measuring CLI and optimizing reduction. emphasis on the importance of selecting resources and transmitting transmission configuration information. It is doing so. Mitigation strategies include adjusting transmission power and coordinating. These include beamforming, timing adjustments, and the use of advanced receivers. US9854539B2 is a 30-cell inter-cell communication system for high-frequency (e.g., millimeter wave) communications. a radio communication system and a beam control method to reduce interference It explains that the system uses beamforming to focus signals in specific directions. This enables the spatial isolation and spatial multiplexing of high-power signals. This ensures increased frequency utilization efficiency. However, adjacent cells Intercellular interference can occur between them. To solve this problem, adjacent base 35 by gathering information about user terminals from the stations and monitoring the beams 4 zeros (directions with minimized power) to user terminals in adjacent cells A coordinated beamforming (CB) system is proposed to guide the beam. In conclusion, all the problems mentioned above necessitate an innovation in the relevant technical field. It has made it mandatory. 5 A BRIEF DESCRIPTION OF THE INVENTION The present invention aims to eliminate the aforementioned disadvantages and introduce new technologies to the relevant technical field. It is about a method to bring advantages. 10 One aim of the invention is to identify beam pairs for reducing CLI while source. to significantly reduce the need. All the objectives mentioned above and those that will emerge from the detailed explanation below are 15. The present invention aims to achieve this by using sub-band full-duplex (SBFD) technology. capable of communication and transmission beamforming, as well as reception beamforming. causing cross-connection interference (CLI) between base stations that can perform this It is a method for detecting light beams, and its characteristic feature is that it includes the following steps: is its characterization; 20 - the designation of a wide beamset, each belonging to at least two base stations; here The broad beam configuration in question includes broad beams that are wider than narrow beams, Each wide beam spatially encompasses at least two narrow beams... - Interference measurement by two base stations on the specified beamsets implementation, 25 - the minimum CLI that an attacker wide beam causes on a victim wide beam The detection of an attacker and a victim in a wide beam pair by two base stations, - The identified attacker and victim are located on two bases on each narrow beam belonging to the wide beam pair. Interference measurement is carried out by the station, - at least one 30 CLI caused by an attacker's narrow beam on a victim's narrow beam. The attacker and the victim, a pair of narrow beams of light, were detected by two base stations. Our invention attempts to address the problems mentioned above, initially using wide beams. taking measurements and then making more precise measurements with narrower beams by offering a two-stage beamforming matching process that includes its implementation, the solution This approach is more resource-efficient, flexible, and reduces CLI by 35%. It is designed to be more effective, thus improving the overall performance of SBFD systems. It increases. A feature of a possible configuration of the invention is that it is based on pairs of narrow beams of light for both the aggressor and the victim. This involves the allocation of resources. Another possible configuration of the invention features narrow beams of n number of antenna elements. by using, wide beams are created using m number of antenna elements; here The number n is greater than the number m; “two base stations on the specified beamsets. The step of "performing interference measurement by m number of antenna elements" carried out using and "belonging to the identified attacker and victim wide beam pair On each narrow beam, interference measurement by two base stations is 10 The "implementation" step depends on the identified aggressor and victim broad beam pairs. This is achieved by using a portion of a specified number of antenna elements, determined as n. Another possible configuration of the invention features "two bases on specified beamsets". In the step "Performing interference measurement by the station", Cell Identifier 15 Synchronization Signal Block (CD-SSB) or Non-Cell Identifier Synchronization The use of Signal Blocking (NCD-SSB) and "detected attacker and victim wide beam" Interference measurement by two base stations on each narrow beam belonging to the pair. channel status information-reference for creating narrow beams in the "implementation" step This involves the use of signal (CSI-RS) ports. 20 Another possible configuration of the invention would be characterized by at least three base stations. Sharing information between the aggressor and the victim via a broad beam of light; first base The station, along with at least the second and third base stations, shared a common attacker and victim network. If it is determined that it has a beam pair, the first base station will send 25 The attacker and victim were identified from the second and third base stations with a wide beam of light. Interference measurements are performed on each narrow beam of the pair at the same time and frequency. It includes the steps for utilizing resources. Another possible configuration of the invention would feature 30 by at least four base stations. Sharing information between the aggressor and the victim using a broad beamforming pair; at least four base pairs. that the station did not have a common attacker and victim wide beam pair and the first base station and the third base station's wide beam pair of the first attacker and the victim, The second base station and the fourth base station are the second attacker and the victim's location. If it is determined that it has a beam pair; the first base station, the second base station 35 station, third base station and fourth base station, first and second 6 Interference measurement on each narrow beam of the aggressor and victim wide beam pairs. This involves using the same time and frequency resources during the process. Another possible realization of the invention is a base station's victim beams and In the case of containing aggressive beams, Non-Zero Power Channel Status Information Reference 5 It can generate multiple beams simultaneously using signal (NZP CSI-RS) sources and this The process involves obtaining Zero Power Channel Status Information for each receiving beam from another base station. Characterized by its repetition across sources using a Reference Signal (ZP CSI-RS). is being done. Another possible configuration of the invention would feature 10 by at least three base stations. Sharing information between the aggressor and the victim in a narrow beam of light; aggressor and victim If narrow beam pairs are not common among at least three base stations, the first The attacker and the victim belonged to a pair of base stations, the radio source of the narrow beam pair, the second steps for allocation by a pair of base stations for use in communication It includes. 15 BRIEF DESCRIPTION OF THE FIGURE Figure 1 is a diagram showing the system and the wide-beam CLI measurement. Figure 2 is a diagram showing a narrow beam CLI measurement. Figure 3 shows a system consisting of 3 base stations and wide-beam CLI measurements. It is a drawing. Figure 4 is a diagram showing the narrow beam CLI measurement. 25 Figure 5 shows the flowchart of the method. Figure 6 shows a system consisting of 3 base stations and wide-beam CLI measurements. It is a drawing. Figure 7 shows a system consisting of 4 base stations and wide-beam CLI measurements. It's a drawing. 30 Figure 8 is a diagram showing a system consisting of 4 base stations and narrow-beam CLI measurements. 7 REFERENCE NUMBERS GIVEN IN THE FIGURE 100 Base stations 111 First base station 112 Second base station 5 113 Third base station 114 Fourth base station 210 Wide beam 211 Attacker and victim wide beam pair 211a First attacker and victim wide beam pair 10 211b Second attacker and victim wide beam pair 220 Narrow beam 221 Attacker and victim, a pair of narrow beams DETAILED DESCRIPTION OF THE INVENTION 15 This detailed explanation of the invention does not merely aim to improve understanding of the subject matter; it does not contain any other information. This is explained with examples that will not create a limiting effect. The invention reduces cross-connection interference (CLI) in sub-band full duplex (SBFD) systems. It offers a two-stage beamforming method for the resource management process. It focuses on optimizing efficiency and flexibility. This method is based on beamforming. With its innovative approach, it departs from the known state of the art and from existing techniques. It significantly reduces the associated burden and complexity. The invention causes beams that cause cross-connection interference (CLI) between base stations (100). It is a method for detection. Referring to Figure 1, the system performing the method has a large number of It includes base stations (100). Base stations (100) are subband full duplex (SBFD) It can communicate using technology and transmit via beamforming and receive via beamforming. It can perform. Base station (100), antenna arrays for beamforming, different subbands 30 Transceiver modules capable of simultaneous sending and receiving, sending and receiving Beamforming with filtering and coupling components to separate and isolate signals. It includes algorithms and signal processing units for interference cancellation. Base stations contain (100) ports. Ports are used for signal processing of the base station (100) 35 signal units such as RF chains or logic antenna ports that connect to antenna elements refers to the pathways or interfaces; the number of virtual antenna ports, CSI-RS ports 8 determines the maximum number of these ports and the number of these ports at the base station (100) at the same time determines the number of orthogonal and independent beams it can generate; for each virtual antenna port The number of dropped antenna elements, the total number of virtual ports, the beam shape, and coverage. It can affect the area. The maximum number of orthogonal beams created simultaneously is supported. When associated with CSI-RS ports, the beam shape and width are essentially determined by each virtual antenna (5). the number of antenna elements falling into the port and the total number of virtual antenna ports It depends on the aperture size. To create a wider beam, each virtual antenna port... By keeping the number of dropped antenna elements constant, the virtual antenna ports are smaller. We can activate the cluster or create a wider beam by separating each virtual one. We can reduce the number of antenna elements falling into the antenna port. 10 Referring to Figure 3, the method includes the following steps: - Wide beam (210) sets, each belonging to at least two base stations (100). determination; here the wide beam (210) set in question is wider than the narrow beams (220) 15 It includes wide beams (210), each wide beam (210) spatially containing at least two It includes the narrow beam (220). For example, a base station (100) may contain 32 ports. Each port has an independent port corresponding to... The beam can be defined as a narrow beam (220) or each beam corresponds to more than one port 20 We can create a set of rays from which the rays arrive (for example, 4 rays, each corresponding to 8 CSI-RS ports). The wide beam (210) is spatially wider, encompassing multiple narrow beams (220). It can be defined as a beam. When generating pre-coded CSI-RS beams, virtual There is no direct mapping between the antennas and the CSI-RS antenna ports. This mapping is spatial. This is accomplished using a filter. In this case, a virtual 25 is used to create a wider beam. A one-to-one mapping is required between the antenna ports and the CSI-RS ports; in this way, there are still 32 CSI- A wider beam can be obtained using the RS port. With fewer CSI-RS ports. a wider beam of antenna array consisting only of a smaller number of virtual antenna ports It can be shaped using a subset of it. Otherwise, using the entire antenna array would be more effective. Even if only a small number of ports are used, the number of antenna elements mapped to each port will increase, and the antenna will be 30. Control over the elements will decrease; this will result in sharper but less controllable elements. and will result in fewer orthogonal beams. - Interference measurement by two base stations (100) on the specified beamsets The neighboring base station (100) that may cause CLI to be implemented. It performs. As seen in the figure, beam-level cross-linking interference (CLI) broad downlink reference signals corresponding to the values ​​for calculating 9 Transmission and reception beams are used. Beam-level CLI values ​​are for each pair of beams. RSSI (Received Signal Strength Indicator) and RSRP (Reference Received Signal Strength) values ​​for It can be obtained by calculation. - Two base stations (100) by an attacker wide beam (210) hit a victim wide 5 CLI created on beam (210) at least one attacker and victim wide beam pair (211) detection. - Referring to Figure 2, each of the identified aggressor and victim wide beam pairs (211) For narrow beam (220), interference measurement is performed by two base stations (100). 10 - By two base stations (100), an attacker's narrow beam (220) to a victim's narrow beam (220) detected at least one attacker and victim narrow beam pair (221) created by CLI on (220). to be done. Resource allocation is based on the obtained aggressor and victim narrow beam pairs (221). This can be achieved if multiple pairs, the same attacker with the same beam number, or If they are sharing the victim, the allocation is made accordingly. The aggressor and victim pairs are completely If they are different, the same resources can be used for different aggressor-victim pairs. This approach, Optimize resource utilization by enabling resource sharing for incompatible pairs. 20 thus reducing the overall signal load and increasing efficiency. Base stations (100), on attacker and victim narrow beam pairs (221) and their timing preferences They exchange information. This coordination minimizes interference between the identified beam pairs. It enables downloading and improves overall network performance. Referring to Figure 1, the aggressor and victim broad beam pairs (211) have a high level of crossover. They are pairs of beams that involve a connection attempt. In other words, a base station (100) The attacking beam crosses over the victim beam of a neighboring base station (100). This causes a connection attempt. The method first attempts to intercept network-wide interference using downlink reference signals. It uses wide beams (210) to measure. In a possible configuration, measurements could be performed using fewer antenna elements. This situation requires a reduction in the number of antenna elements activated to create wider beams. This involves using a certain number of pairs. This configuration minimizes pairs with high interference. It allows for a comprehensive initial screening that enables detection with a delay. Once the attacker and victim wide beam pairs (211) are identified, the system becomes more sensitive For detailed measurements by focusing on specific beams that require high resolution, a larger size is needed. It switches to the antenna component set. In another possible configuration, the measurement is taken in Cell 5 for initial wide beam (210) CLI measurement. Identifier Synchronization Signal Block / Cell Non-Identifier Synchronization It can utilize Signal Blocking (CD-SSB / NCD-SSB) signals. CD-SSB / NCD-SSB is high-performance. It provides a comprehensive view that makes it possible to identify interfering beam pairs. In the second phase, we will focus on the high-intensity pairs identified in the initial phase, and then... The relevant CSI-RS ports are used for more precise and clearer beam acquisition. This step is fundamental to the following 10: Its task is to identify highly engaging beam pairs and aggressor-victim relationships. The goal is to create. The technical impact of this step is to create a startup environment with minimum resource usage. The aim is to provide a broad overview. Referring to Figure 3, a configuration containing 3 neighboring base stations (100) has been provided. In this example, 15 Wide beams (210) are used to measure the interference across the network. After the initial measurements, each CLI matrices can be created, one of which represents a pair of base stations (100). In the first stage, wide beams (210) are used to obtain the initial measurement of the intervention. Each CLI matrix corresponds to a pair of base stations (100) and has a beam-level interference of 20 It provides a general overview. The beams forming the sample interference are represented by shaded areas. These areas are defined as aggressor and victim broad beam pairs (211). After identifying the beam pairs with the most interference, the narrow beams belonging to the identified pairs are analyzed. (220) is measured. This process involves measuring the beams in order to provide a more detailed measurement of the interference. The narrowing is shown in Figure 4. Beam matching is performed and these narrow beams More detailed CLI matrices are also created for this. These pairs are narrow beams of attacker and victim. pairs (221) are defined as. Referring to Figure 6, in a possible configuration, the first base station (111), the second base station (112) 30 and a third base station (113) has been provided. Base stations (100) are on wide beams. CLI performs the measurement and determines the attacker and victim wide beam pair (211). Base The stations (100) exchange information about the sacrificial wide beam pair (211) between them. Figure 6, with the first base station (111), first base station (111) and second base station (112) It shows that the common aggressor and victim have a wide beam pair (211). The first 35 attacker and victim wide beam pair (211a), first base station (111) and second base station between station (112); second attacker and victim wide beam pair (211b), first base 11 It is between base station (111) and the third base station (113). If the first base station (111) has at least one base station (112) and a third base station (113) If it is determined that the attacker and the victim have a wide beam pair (211), the first base station (111) by the second base station (112) and the third base station (113) Each narrow beam (220) of the wide beam pairs (211) of the identified aggressor and victim 5 The same time and frequency sources are used when performing interference measurements. Thus, First base station (111), victim and attacker wide range of both base stations (100) The scan process of narrow beams (220) on the narrow beams (220) simultaneously and at the same time It completes by using the resources. Referring to Figure 7, the first base station (111), the second base station (112), the third base station (113) and the fourth base station (114) were provided. Base stations (100), wide beams CLI measurement is performed on the attacker and victim wide beam pair (211) information. They share with each other. The first base station (111) and the third base station (113) share the first base station (111). The attacker and the victim have a wide beam pair (211a). 15 with the second base station (112). The fourth base station (114) has a second attacker and victim wide beam pair (211b). First aggressor and victim wide beam pair (211a) and second aggressor and victim wide The beam pair (211b) does not share any common beam. None of the base stations (100) A common aggressor and victim do not have a wide beam pair (211). At least four bases 20 that the station does not have a common attacker and victim wide beam pair (211) If identified, the first base station (111) and the third base station (113) are the first attackers and victim wide beam pair (211a) and second base station (112) and fourth base station (114) if the second attacker and the victim have a wide beam pair (211b); first base station (111), second base station (112), third base station (113) and fourth base station (114) by the first attacker and the victim wide beam pair (211a) and the second attacker and 25 Interference measurement on each narrow beam (220) of the sacrificial wide beam pair (211b). The same radio sources are used during the process. This approach is common for non-overlapping pairs. It optimizes resource usage by enabling resource utilization, thus improving the overall signal. It reduces the workload and increases efficiency. The system may include more than three neighboring base stations (100). The method is implemented similarly. This approach enables efficient resource utilization during beam matching and allows for different aggressor and victim pairs simultaneously without additional resource conflicts It allows for management. 35 12 The scope of protection of the invention is specified in the claims attached hereto, and these details are strictly adhered to. The explanation cannot be limited to those given for illustrative purposes. Because a person who is an expert in the field... Similar structures in light of the above, without deviating from the main theme of the invention. It is clear that this can be demonstrated.

Claims

13 REQUESTS 1. Capable of communicating using sub-band full-duplex (SBFD) technology. Base capable of performing both transmit and receive beamforming. Detect beams that cause cross-linking interference (CLI) between stations (100) 5 It is a method aimed at achieving this, and its characteristic feature is that it includes the following steps: is to be done; - a wide beam (210) set, each belonging to at least two base stations (100). determination; here the wide beam (210) set in question is wider than the narrow beams (220). It includes wide beams (210), each wide beam (210) spatially containing at least two 10 includes narrow beam (220) - interference by at least two base stations (100) on the specified beamsets performing the measurement, - by at least two base stations (100), an attacker's wide beam (210) At least one attacker caused CLI on the victim wide beam (210) and the victim wide beam 15 Detection of beam pair (211), - each narrow beam (220) belonging to the pair of wide beams (211) of the identified attacker and victim Interference measurement is performed by two base stations (100) on it, - an attacker causes a narrow beam (220), a victim causes a narrow beam (220) on the CLI. At least one attacker and one victim in a narrow beam pair (221), at least two base stations (100) 20 detected by.

2. A method according to Claim 1, characterized by its use of narrow beam pairs of aggressors and victims. (221) is the realization of resource allocation based on.

3. A method according to claim 1, the feature of which is; narrow beams (220) n number of antenna elements It was created by using; wide beams (210) m number of antenna elements the creation, where n is greater than m; “on the specified beamsets, The step of “performing interference measurement by two base stations (100)” number m This is carried out using an antenna element and "the detected attacker and victim are 30". On each narrow beam (220) of the beam pair (211), by two base stations (100) The step of "conducting the intervention measurement" involves identifying a wide range of aggressors and victims. A portion of n number of antenna elements determined according to beam pairs (211) This is accomplished using... 35 4. It is a method according to Claim 1, and its characteristic is; “on specified beamsets, two bases In the step of “Performing interference measurement by the station (100) Cell 14 Identifier Synchronization Signal Block (CD-SSB) or Non-Cell Identifier The use of Synchronization Signal Blocking (NCD-SSB) and "detected attacker and victim" On each narrow beam (220) of the wide beam pair (211), two base stations (100) in the step of “carrying out the interference measurement by narrow beams (220) This is achieved by using channel status information-reference signal (CSI-RS) ports. 5 5. It is a method according to claim 1, and its characteristic is; - by at least three base stations (100), the attacker and the victim a wide beam pair (211) sharing information with each other; - a common 10 for the first base station (111), at least for the second and third base stations (113) If it is determined that the aggressor and the victim have a wide beam pair (211), by the first base station (111) to the second base station (112) and the third base station (113) each narrow beam of the wide beam pairs of attacker and victim identified (211) While interference measurement is performed on (220), time, frequency and code sources It includes the steps for using it. 15 6. A method according to claim 1 or claim 5, characterized by: - by at least four base stations (100), the attacker and the victim are exposed to a wide beam pair (211) sharing information with each other; - at least four base stations have a common attacker and victim wide beam pair (211) 20 not and the first base station (111) and the third base station (113) were the first attackers and the victim wide beam pair (211a), second base station (112) and fourth base station (114) has a second attacker and victim wide beam pair (211b) When determined; first base station (111), second base station (112), third base station (113) and the fourth base station (114) by wide beam 25 pair (211a) and each narrow beam belonging to the wide beam pair (211b) of the second attacker and victim While interference measurement is performed on (220), time, frequency and code sources usage.

7. A method according to claim 1, the characteristic of which is; a base station (100) to the victim beams and 30 When it has aggressive beams, the Very Strong Channel Status Information Reference Signal (NZP) It can generate multiple beams simultaneously using CSI-RS sources and another base For each receiving beam of the station (100), this operation is performed on the sources using Zero Power Channel. The situation is repeated using the Information Reference Signal (ZP CSI-RS). 35

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