Apparatus and method for managing interference in a wireless communication system

Abstract

The present disclosure relates to a pre-fifth generation (5G) or 5G communication system provided to support higher data rates than fourth generation (4G) communication systems (such as long term evolution (LTE)). A method for operating a management device in a wireless communication system is provided. The method includes: obtaining measurement results of multiple cells respectively; based on the measurement results, identifying an interference source cell and an interfered cell among the multiple cells by atmospheric interference; and performing interference control on at least one of the interference source cell or the interfered cell, wherein the measurement results include interference information related to a downlink signal of at least one other cell measured in an uplink resource duration of the measuring cell and cell information of the at least one other cell.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system and more particularly to an apparatus and method for managing interference in a wireless communication system. Background Art

[0002] In order to meet the increased demand for wireless data services since the deployment of the fourth generation (4G) communication system, efforts have been made to develop improved fifth generation (5G) or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are also referred to as "beyond 4G networks" or "post-Long Term Evolution (LTE) systems".

[0003] 5G communication systems are considered to be implemented in higher frequency (millimeter wave) bands (e.g., 60 GHz bands) in order to achieve higher data rates. In order to reduce the propagation loss of radio waves and increase the transmission distance, technologies such as beamforming, massive multiple-input multiple-output (MIMO), full-dimensional multiple-input multiple-output (FD-MIMO), array antennas, analog beamforming, and massive antennas are discussed in 5G communication systems.

[0004] In addition, in the 5G communication system, system network improvements are being developed based on advanced small cells, cloud radio access network (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, collaborative communications, coordinated multi-point (CoMP), receiving-end interference cancellation, etc.

[0005] In the 5G system, hybrid frequency shift keying (FSK) and quadrature amplitude modulation (FQAM) and sliding window superposition coding (SWSC) as advanced coding modulation (ACM) have been developed, and filter bank multi carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies have been developed.

[0006] A signal transmitted from a distant cell is transmitted for a long time, and it can be received during the uplink resource duration of at least one other cell. Since the received signal interferes with the corresponding cell, the uplink communication quality may be degraded.

[0007] The above information is provided as background information only to assist in understanding the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above may be applicable as prior art to the present disclosure. Summary of the invention

[0008] Solution to the problem

[0009] Aspects of the present disclosure are to solve at least the above problems and / or disadvantages and provide at least the advantages described below. Therefore, one aspect of the present disclosure is to provide an apparatus and method for effectively controlling inter-cell interference in a wireless communication system.

[0010] Another aspect of the present disclosure is to provide an apparatus and method for identifying an aggressor cell and a victim cell in a wireless communication system.

[0011] Another aspect of the present disclosure is to provide an apparatus and method for controlling interference of an interference source cell in a wireless communication system.

[0012] Another aspect of the present disclosure is to provide an apparatus and method for interference avoidance of an interfered cell in a wireless communication system.

[0013] Another aspect of the present disclosure is to provide an apparatus and method for controlling inter-cell interference based on interference aspects in a wireless communication system.

[0014] Another aspect of the present disclosure is to provide an apparatus and method for controlling inter-cell interference based on cell distance in a wireless communication system.

[0015] Another aspect of the present disclosure is to provide an apparatus and method for adjusting a guard period according to interference from another cell in a wireless communication system.

[0016] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the presented embodiments.

[0017] According to one aspect of the present disclosure, a method for operating a management device in a wireless communication system is provided. The method includes: obtaining measurement results of multiple cells respectively; identifying interference source cells and interfered cells among the multiple cells by atmospheric interference based on the measurement results; and performing interference control on at least one of the interference source cell and the interfered cell, wherein the measurement results include interference information related to a downlink signal of at least one other cell measured in an uplink resource duration of the measuring cell and cell information of the at least one other cell.

[0018] According to another aspect of the present disclosure, a management device in a wireless communication system is provided. The management device includes at least one transceiver and at least one processor, wherein the at least one processor is configured to respectively obtain measurement results of multiple cells, identify interference source cells and interfered cells among the multiple cells through atmospheric interference based on the measurement results, and perform interference control on at least one of the interference source cell and the interfered cell, wherein the measurement results include interference information related to a downlink signal of at least one other cell measured in an uplink resource duration of the measurement cell and cell information of the at least one other cell.

[0019] Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description in conjunction with the accompanying drawings, in which:

[0021] Figure 1 A wireless communication system according to an embodiment of the present disclosure is shown;

[0022] Figure 2 The configuration of a base station in a wireless communication system according to an embodiment of the present disclosure is shown;

[0023] Figure 3 The configuration of a management device in a wireless communication system according to an embodiment of the present disclosure is shown;

[0024] Figure 4A A process for managing interference in a wireless communication system according to an embodiment of the present disclosure is shown;

[0025] Figure 4B A functional configuration of a process for managing interference in a wireless communication system according to an embodiment of the present disclosure is shown;

[0026] Figure 5A flow chart of a base station for measuring atmospheric interference in a wireless communication system according to an embodiment of the present disclosure is shown;

[0027] Figure 6 A flow chart of a management device for determining an interference source cell and / or an interfered cell in a wireless communication system according to an embodiment is shown;

[0028] Figure 7 A flow chart of a management device for controlling interference in a wireless communication system according to an embodiment of the present disclosure is shown;

[0029] Fig. 8A A flow chart of a management device for controlling interference associated with an interference source cell in a wireless communication system according to an embodiment of the present disclosure is shown;

[0030] Figure 8B A flow chart of a management device for controlling interference associated with an interfered cell in a wireless communication system according to an embodiment of the present disclosure is shown;

[0031] Fig. 9 The invention shows the interference effect based on the distance in the wireless communication system according to the embodiment of the present disclosure;

[0032] Fig.10 A flowchart of a management device for controlling interference based on distance in a wireless communication system according to an embodiment of the present disclosure is shown; and

[0033] Fig.11 A flow chart of adaptive interference control in a wireless communication system according to an embodiment of the present disclosure is shown.

[0034] Throughout the drawings, like reference numerals will be understood to refer to like parts, components and structures. DETAILED DESCRIPTION

[0035] The following description with reference to the accompanying drawings is provided to help fully understand the various embodiments of the present disclosure defined by the claims and their equivalents. It includes various specific details that help understanding, but these are only considered to be exemplary. Therefore, those of ordinary skill in the art will recognize various changes and modifications of the various embodiments.

[0036] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustrative purposes only and not for limiting the present disclosure as defined by the appended claims and their equivalents.

[0037] It should be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0038] In various embodiments to be described below, hardware methods may be described as examples. However, it should be understood that various embodiments may include techniques using hardware and software, and various embodiments do not exclude software-based methods.

[0039] Various embodiments provide an apparatus and method for controlling inter-cell interference in a wireless communication system. More specifically, the present disclosure describes a technology for measuring interference of downlink signals on uplink resource durations due to propagation delay in a wireless communication system and controlling interference for each cell.

[0040] The terms indicating control information (e.g., information, value, command), terms indicating operation status (e.g., step, operation, process), terms indicating signals (e.g., signal, sequence, symbol, information), terms indicating data, terms indicating network entities (e.g., base station, digital unit (DU), radio unit (RU), element management system (EMS), access unit (AU), centralized unit (CU), long term evolution (LTE) management server (LMS), management device), terms indicating messages (e.g., signal, command, trigger, notification), and terms indicating components of a device used in the following description are for explanation purposes only. Therefore, the present disclosure is not limited to the terms to be described, and other terms having technically the same or similar meanings may be used.

[0041] In the present disclosure, in order to determine whether a specific condition is satisfied, expressions such as "greater than" or "less than" are used as examples, and expressions such as "greater than or equal to" or "less than or equal to" are also applicable and are not excluded. For example, a condition defined with "greater than or equal to" can be replaced with "greater than" (or vice versa), a condition defined with "less than or equal to" can be replaced with "less than" (or vice versa), and so on.

[0042] As an example, the present disclosure uses terminology used in some communication standards (eg, the 3rd Generation Partnership Project (3GPP)) to provide various embodiments. The various embodiments of the present disclosure can be readily applied to other communication systems.

[0043] Figure 1 A wireless communication system according to an embodiment of the present disclosure is shown.

[0044] refer to Figure 1 , the wireless communication system includes a base station 110, a base station 120 and a management device 130. Figure 1 Base station 110 and base station 120 are shown as some of the nodes using a radio channel in a wireless communication system, but other base stations may also be included.

[0045] Base station 110 and base station 120 are network infrastructures that provide radio access to terminals. Based on the signal transmission distance, base station 110 and base station 120 have coverage defined as a geographical area. Base station 110 and base station 120 may be referred to as access point (AP), eNodeB (eNB), fifth generation node (5G node), next generation node B (gNB), wireless point, transmit / receive point (TRP) or other terms with technical equivalent meanings. In some cases, a cell may refer to a communication area provided from a base station. A base station may cover one cell or multiple cells. In this article, multiple cells may be distinguished by their supported frequencies or their coverage sectors. In the following, a base station may include a cell, and a cell may include a base station.

[0046] The management device 130 controls a plurality of base stations (or cells) including the base station 110 and the base station 120. For example, the management device 130 may control inter-cell interference. According to various embodiments of the present disclosure, the management device 130 may control to identify an interference source cell, and control the interference source cell, the interfered cell, the detected cell or the terminal to avoid interference. According to an embodiment of the present disclosure, the management device 130 may be located in a base station. According to an embodiment of the present disclosure, the management device 130 may be a network entity separated from the base station.

[0047] Time division duplex (TDD) communication systems use different time resources to support downlink and uplink communications between base stations and terminals. Due to propagation delays in signal transmission on radio channels, the downlink signal of a cell can be received in the time resources of the uplink of at least one other cell. Therefore, a method is needed to provide good communication quality by measuring the inter-cell interference caused by propagation delay and controlling the corresponding interference.

[0048] Before describing the inter-cell interference of the present disclosure, the resource structure of the TDD communication system is explained. In some embodiments of the present disclosure, the base station and the terminal may use the TDD communication system of LTE. The TDD communication system of LTE defines the time resources of downlink communication and the time resources of uplink communication in one radio frame. The radio frame may include an uplink (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 DL transmission to UL transmission. In this article, the combination of UL subframes, DL subframes and SSFs in a frame is referred to as UL / DL configuration. Another UL / DL configuration indicates another combination of UL subframes, DL subframes and SSFs in a frame. For example, UL / DL configuration #2 may include six DL frames, two UL subframes and two SSFs, and UL / DL configuration #5 may include eight DL frames, one UL subframe and one SSF. In some embodiments of the present disclosure, the wireless communication environment 100 may support the LTE-TDD communication system. The UL / DL configuration may operate as shown in Table 1. In Table 1, D represents a DL subframe, S represents an SSF, and U represents a UL subframe.

[0049] Table 1

[0050]

[0051] The SSF may include a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS). The DwPTS is the DL resource duration in the SSF and may be used for the transmission of a physical downlink shared channel (PDSCH). The UpPTS is the UL resource duration in the SSF and may be used for the transmission of a sounding reference signal (SRS) or a physical random access channel (PRACH). The GP has no DL transmission and UL transmission and may need to switch between DL and UL. In one SSF (e.g., 1 millisecond), the GP may be between the DwPTS and the UpPTS. In this document, the combination of the DwPTS, GP, and UpPTS in one SSF is referred to as an SSF configuration. Another SSF configuration may refer to another combination of the DwPTS length, the GP length, and the UpPTS length in one SSF. If the wireless communication environment 100 supports an LTE-TDD communication system, the SSF configuration may operate as shown in Table 2. For example, SSF configuration #5 may refer to a combination in which DwPTS occupies three symbols, GP occupies nine symbols, and UpPTS occupies two symbols, and SSF configuration #7 may refer to a combination in which DwPTS occupies ten symbols, GP occupies two symbols, and UpPTS occupies two symbols.

[0052] Table 2

[0053]

[0054] In some embodiments of the present disclosure, the base station and the terminal may use a TDD communication system of NR. The TDD communication system of NR may be configured more flexibly than the LTE TDD communication system. The TDD communication system of NR defines a DL-UL pattern indicating the relationship between a DL time resource for DL ​​communication and a UL time resource for UL communication. The DL-UL pattern may include a period, a DL duration, and a UL duration. The period may refer to the time when a DL-UL pattern is adopted. For example, the period may be one of 0.5ms (milliseconds), 0.625ms, 1ms, 1.25ms, 2.5ms, 3ms, 4ms, 5ms, and 10m. The DL duration may be a time resource for DL ​​communication. The DL duration may be represented by the number of time slots, the number of time slots and symbols, or the number of symbols. The DL duration may be located at the beginning of a period. The UL duration may be a time resource for the uplink. The UL duration may be represented by the number of time slots, the number of time slots and symbols, or the number of symbols. The UL duration may be located at the end of a period. Other slots except 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) in one cycle may be flexible slots.

[0055] As an example of the resource structure of NR TDD, if the subcarrier spacing (SCS) is 15kHz, five time slots can be defined in a period of 5ms. Among the five time slots, the first two time slots can be DL time slots, the second two time slots can be UL time slots, and the middle time slot can include UL symbols and DL symbols. Among the 14 symbols of the remaining time slots, the first five symbols can be DL symbols, the second three symbols can be UL symbols, and the remaining six symbols can be flexible symbols.

[0056] It is necessary to distinguish between the DL duration and the UL duration because the TDD communication system uses the same carrier frequency in UL transmission and DL transmission. Therefore, the resource structure of the TDD communication system may include the DL duration, the UL duration, and the remaining duration between the DL duration and the UL duration. At the same time, due to this time difference, inter-cell interference may be caused by propagation delay. For example, the base station 110 in the LTE communication system may send or receive a signal according to the frame 112. The base station 120 may send or receive a signal according to the frame 122. In frame 112 or frame 122, D represents a DL subframe, time slot or symbol, S represents an SSF, time slot or flexible symbol, and U represents a UL subframe, time slot or symbol. In some cases, the signal sent from the base station 110 may cause interference to the base station 120. For example, if in Figure 1 In the TD system of FIG. 1 , even if the base station 110 and the base station 120 are tens to hundreds of kilometers away from each other, the signal transmitted from the base station 110 may cause strong interference at the base station 120. For example, if the DL signal transmitted in the DwPTS of the SSF of the base station 110 undergoes a propagation delay and is then received at the base station 120 on the UL subframe of the base station 120, the signal may cause interference to the UL signal received at the base station 120. Since the distance between the base stations may cause interference even within hundreds of kilometers, the atmospheric waveguide may be a problem even between counties using different frequency bands.

[0057] As described above, when the DL signal of a specific cell is sent for a long time, the DL signal can be received in the UL resource duration of a cell far away from the specific cell. In other words, base stations and terminals far away from each other in a cell may be interfered with by a specific cell. Due to the propagation delay of a distant cell, interference to the UL duration can be referred to as distant cell interference, time-of-flight (TOF) interference, atmospheric waveguide interference, atmospheric interference, propagation delay interference or distant interference. Hereinafter, the present disclosure describes this interference as atmospheric interference. In addition, the specific cell causing interference can be referred to as an interference source (aggressor), an interference source base station (aggressor base station), an interference source cell (aggressor cell), an interferer (interferer), an interferer base station (interferer base station) or an interference cell (interference cell). The interfered cell can be referred to as a victim (victim), an interfered base station (victim base station), an interfered cell (victim cell), a victim (prey), a victim cell (preycell), a detector (detector) or a detector base station (detector base station). For example, base station 110 may be an interference source cell, and base station 120 may be an interfered cell. Herein, the concepts of interference source, interferer, interfered person, and detector are relative, and a cell may be both an interference source cell and an interfered cell.

[0058] If the downlink signal of at least one other cell enters the UL duration, the UL signal sent with a relatively low output may be susceptible to atmospheric interference caused by the DL signal. As a result, the interfered cell may not detect the UL signal. In order to solve this problem caused by interference, a method is needed to identify the interference source cell (e.g., the cell of the base station 110) related to the interfered interfered cell (e.g., the cell of the base station 120) and avoid or reduce the interference of the interference source cell at the interfered cell. However, if the interference signal is received from tens or hundreds of kilometers, there are too many interference source candidates and it is not easy to specify possible interference source cells. In addition, there may be multiple interference source cells. Therefore, the present disclosure provides various embodiments for identifying interference source cells and reducing or avoiding interference.

[0059] exist Figure 1 In the interference, atmospheric interference is caused by receiving a signal transmitted in the DwPTS of the SSF, in the UpPTS of the SSF, or in a subsequent UL subframe. The concepts of DwPTS and UpPTS are used in LTE or LTE-Advanced (LTE-A) systems, and the definitions of various embodiments of similar interference relationships and interference control can be applied to the resource structure of the NR system (e.g., DL-UL mode, periodicity, flexible time slots, flexible symbols).

[0060] Figure 2 The configuration of a base station in a wireless communication system according to an embodiment of the present disclosure is shown. Figure 2 The configuration of may be understood as the configuration of base station 110 or base station 120. Terms such as “part” or “device” mean a unit for processing at least one function or operation and may be implemented using hardware, software, or a combination of hardware and software.

[0061] refer to Figure 2 The base station includes a wireless communication unit 210, a backhaul communication unit 220, a storage unit 230 and a control unit 240.

[0062] The wireless communication unit 210 transmits and receives signals through a radio channel. For example, the wireless communication unit 210 performs a conversion function between a baseband signal and a bit string according to the physical layer standard of the system. For example, in data transmission, the wireless communication unit 210 generates complex symbols by encoding and modulating the transmitted bit string. In addition, in data reception, the wireless communication unit 210 recovers the received bit string by demodulating and decoding the baseband signal.

[0063] In addition, the wireless communication unit 210 up-converts the baseband signal to a radio frequency (RF) band signal, transmits it via an antenna, and down-converts the RF band signal received via the antenna to 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), etc. In addition, the wireless communication unit 210 may include multiple transmit and receive paths. In addition, the wireless communication unit 210 may include at least one antenna array including multiple antenna elements.

[0064] In terms of hardware, the wireless communication unit 210 may include a digital unit and an analog unit, and the analog unit may include a plurality of sub-units according to operating power and operating frequency. The digital unit may include at least one processor (eg, a digital signal processor (DSP)).

[0065] Thus, the wireless communication unit 210 transmits and receives signals. Therefore, all or part of the wireless communication unit 210 may be referred to as a transmitter, a receiver, or a transceiver. Hereinafter, transmission and reception on a radio channel include the above-mentioned processing of the wireless communication unit 210.

[0066] The backhaul communication unit 220 provides an interface for communicating with other nodes in the network. For example, the backhaul communication unit 220 converts a bit string sent from the base station to another node (e.g., another access node, another base station, an upper node, or a core network) into a physical signal, and converts a physical signal received from another node into a bit string.

[0067] The storage unit 230 stores basic programs, applications, and data for operating the base station, such as setting information. The storage unit 230 may include a volatile memory, a nonvolatile memory, or a combination of a volatile memory and a nonvolatile memory. The storage unit 230 provides the stored data in response to a request from the control unit 240.

[0068] The control unit 240 controls the general operation of the base station. For example, the control unit 240 sends and receives signals through the wireless communication unit 210 or the backhaul communication unit 220. In addition, the control unit 240 records data in the storage unit 230 and reads data from the storage unit 230. The control unit 240 can perform the functions of the protocol stack required by the communication standard. According to an embodiment of the present disclosure, the protocol stack may be included in the wireless communication unit 210. To this end, the control unit 240 may include at least one processor. According to various embodiments of the present disclosure, the control unit 240 may control the base station (e.g., the base station 110 or the base station 120) to perform operations to be explained according to various embodiments.

[0069] Figure 3The configuration of the management device in the wireless communication system according to the embodiment of the present disclosure is shown. The configuration can be understood as the configuration of the management device 130. Terms such as "part" or "~ device" represent a unit for processing at least one function or operation, and can be implemented using hardware, software, or a combination of hardware and software.

[0070] refer to Figure 3 , the management device 130 includes a communication unit 310 , a storage unit 320 and a control unit 330 .

[0071] The communication unit 310 provides an interface for communicating with other devices (e.g., base stations) in the network. For example, the communication unit 310 converts a bit string sent from the management device to another device into a physical signal, and converts a physical signal received from another device into a bit string. For example, the communication unit 310 can send and receive signals. Therefore, the communication unit 310 can be referred to as a modem, a transmitter, a receiver, or a transceiver. To this end, the communication unit 310 can enable the management device to communicate with other devices or systems via a backhaul connection (e.g., a wired backhaul or a wireless backhaul) or a network.

[0072] The storage unit 320 stores basic programs, applications, and data such as setting information for operating the management device. The storage unit 320 may include a volatile memory, a nonvolatile memory, or a combination of a volatile memory and a nonvolatile memory. The storage unit 320 provides stored data according to a request of the control unit 330.

[0073] The control unit 330 controls the general operation of the management device. For example, the control unit 330 sends and receives signals through the communication unit 310. In addition, the control unit 330 records data in the storage unit 320 and reads data from the storage unit 320. To this end, the control unit 330 may include at least one processor. According to various embodiments of the present disclosure, the control unit 330 may control the management device to perform operations to be explained according to various embodiments.

[0074] Figure 4A A process for managing interference in a wireless communication system according to an embodiment of the present disclosure is shown. Interference may refer to atmospheric interference of a signal transmitted from a specific cell in communication with at least one other cell caused by propagation delay.

[0075] refer to Figure 4A According to various embodiments of the present disclosure, the atmospheric interference management process may include a first process 401 for measuring atmospheric interference, a second process 403 for determining an interference source cell and an interfered cell, a third process 405 for managing cell status, and a fourth process 407 for controlling interference.

[0076] In the first process 401, the base station may measure interference from another cell. The base station may measure a signal (e.g., a DL signal) of another cell. In order to identify the interference source, the base station may identify the cell that transmits the signal from the received signal. By measuring the received signal, the base station may generate an interference measurement result. The interference measurement result may include at least one of the interfering cell information, information related to the presence or absence of atmospheric interference, information on the degree of atmospheric interference, and information on the number of interfering cells.

[0077] In the second process 403, the management device may identify the cell for interference management in various ways based on the interference measurement result of the first process 401, and determine the characteristics of the corresponding cell. The characteristics of the cell may include whether the specific cell is an interference source cell, whether the specific cell is an interfered cell, whether the specific cell is an interference source cell and an interfered cell, or whether the specific cell is not at least one of the interference source cell and the interfered cell. According to an embodiment of the present disclosure, a separate base station (separate cell) can determine the characteristics of the cell, that is, determine which cell is an interference source cell or an interfered cell. For example, the base station of the interfered cell can measure a signal from another cell on its cell, and determine that the corresponding cell is an interfered cell based on the measurement result.

[0078] In the third process 405, the management device may manage the state of each cell based on the interference measurement result of the first process 401 and the cell feature determination result of the third process 405. The cell state may refer to whether the interference is managed or the degree of interference management. For example, the cell state may include whether to mitigate the impact of the cell (i.e., mitigate the interference) if the corresponding cell is an interference source cell. Interference mitigation may be referred to as DL interference control. For example, the cell state may include whether to avoid atmospheric interference (i.e., avoid interference) if the corresponding cell is an interfered cell. Interference elimination may be referred to as UL interference control. For example, the cell state may include the degree of interference mitigation of the interference source cell or the degree of atmospheric interference avoidance of the interfered cell. At the same time, the management device determines not to mitigate the interference of the corresponding cell as the interference source cell or the management device determines not to take measures for the interfered cell, which can be understood as an embodiment of interference management of the present disclosure.

[0079] In the fourth process 407, the management device may perform interference control. The management device may perform interference control according to the configuration state of each cell of the third process 405. For example, if the first cell is an interference source cell and interference mitigation is required, the management device may control the interference of the first cell. The management device may send a control command for explicitly or implicitly mitigating interference to the base station of the first cell. For example, if the second cell is an interfered cell and interference avoidance is required, the management device may control the interference of the second cell. The management device may send a control command for explicitly or implicitly avoiding interference to the base station of the second cell.

[0080] Figure 4A The atmospheric interference measurement process of the process is performed by a separate base station, and the other processes are performed by a management device. However, this division is exemplary, and the process can be distributed to various base stations and management devices in various ways. According to an embodiment of the present disclosure, each base station can generate interference measurement results for a separate cell and send the generated results to the management device. The management device can collect the measurement results of the separate cells. The management device can perform interference control based on the collected measurement results. According to another embodiment of the present disclosure, each base station can generate cell information, which includes whether interference control is required based on the interference measurement results and at least one of the required interference control degree, and send the cell information to the management device. The management device can collect cell information of separate cells. The management device can perform interference control based on the collected cell information.

[0081] In the following description, interference management according to various embodiments of the present disclosure is performed by a management device, and interference measurement is performed at a separate base station (separate cell), but various modifications may be made. For example, note that, in addition to the distributed centralized approach, the base station and management device for implementing the interference management process of the present disclosure may be implemented in various ways. According to an embodiment of the present disclosure, the management device may be implemented to include multiple separate management devices. For example, a first management device for the first process may receive measurement results from each cell, a second management device for the second process 403 may collect measurement results from the first management device, and a third management device may perform third and fourth processes based on the measurement results, and send interference control commands to each cell. According to another embodiment of the present disclosure, a management device may be provided in a base station to perform separate cell operations. The measurement results of each cell may be sent to a base station including a management device. For example, a message including an interference measurement result may be transmitted between base stations via an X2 interface. For example, a message including an interference measurement result may be sent from a base station to a higher network entity including a separate management device by signaling. According to another embodiment of the present disclosure, an operation for managing atmospheric interference may be performed by one entity. The management device may be included in a base station of an interfered cell. The base station may measure interference from another cell on a specific cell, determine that the measured cell is an interfered cell, and restrict UL scheduling, perform handover, or set an additional UL carrier to avoid interference.

[0082] Figure 4B The functional configuration of the process for managing interference in a wireless communication system according to an embodiment of the present disclosure is shown. Figure 4A the same or similar process.

[0083] refer to Figure 4B, each of the base stations (or cells) 450-1 to 450-N may include a sequence transceiver block 451, an interference measurement block 452, and an interference control block 453. For interference control according to various embodiments of the present disclosure, an interference source cell / interfered cell determination block 460, an interference control determination block 470, and a statistical processing block 480 may be configured. According to various embodiments of the present disclosure, the interference source cell / interfered cell determination block 460, the interference control determination block 470, and the statistical processing block 480 may be configured by a management device (e.g., Figure 1 According to an embodiment of the present disclosure, at least one of the interference source cell / interfered cell determination block 460, the interference control determination block 470 and the statistical processing block 480 may be implemented by a separate network entity or a base station.

[0084] The sequence transceiver block 451 may be configured to send or receive a DL signal sequence for measuring atmospheric interference in each cell. The interference measurement block 452 may be configured to measure atmospheric interference by measuring a DL signal sent from another cell. The interference control block 453 may be configured to perform DL interference control (i.e., interference mitigation) of an interference source cell or UL interference control (i.e., interference avoidance) of an interferer cell under the control of the interference control determination block 470.

[0085] The interference source cell / interfered cell determination block 460 may be configured to identify the interference source cell or the interfered cell based on the measurement result obtained for each cell. According to an embodiment of the present disclosure, if the management device is connected to each cell in a centralized manner, the interference source cell / interfered cell determination block 460 may obtain the sequence measurement result from the sequence transceiver block 451 of each cell.

[0086] Interference control determination block 470 may be configured to determine whether the interference of controlling at least one interference source cell or at least one interfered cell is effective. For example, interference control determination block 470 may determine whether to control interference. The impact of atmospheric interference may be reduced by limiting the scheduling of all interference source cells or switching all interfered cells, but this may be inefficient because the cell capacity is reduced in terms of the entire network, and unnecessary processes are repeated.

[0087] The statistics processing block 480 may be configured to collect information related to the above-mentioned interference control process. The statistical information may be used to determine the interference source cell / interfered cell or to determine interference control. The statistics processing block 480 may be configured to store the interference source cell / interfered cell determination results, interference control results, interference measurement results, and statistics of time / weather / temperature / humidity / traffic volume. In addition, the statistics processing block 480 may be configured to provide the stored statistics to the interference source cell / interfered cell determination block 460 and the interference control determination block 470.

[0088] The interference source cell / interfered cell determination block 460 can calculate the interference source cell / interfered cell determination results that are very likely to occur under specific conditions by using the statistics and geographic information of time / weather / temperature / humidity / traffic volume and the interference source cell / interfered cell determination result statistical information, and improve the accuracy. If the interference source cell / interfered cell is not frequently determined (for example, limited computing power, limited hardware, or limited radio resources, etc.), the interference source cell / interfered cell determination block 460 can be configured to use accumulated statistics to infer the characteristics of the interference source cell / interfered cell relationship that varies over time.

[0089] The interference control determination block 470 may be configured to identify effective interference control operations for each specific condition by utilizing interferer cell / interfered cell determination results, interferer cell / interfered cell status determination, time / weather / temperature / humidity / traffic statistics, and geographic information.

[0090] Process S1 may include sending measurement information from the sequence transceiver block 451 to the interference source cell / interfered cell determination block 460. In process S1, the base station may send measurement information to the management device. The measurement information may include at least one of the interference source cell / interfered cell relationship of each cell, the signal strength measured by the sequence, and the interference source cell distance determined by the sequence.

[0091] Process S2 may include sending the cell determination information from the interference source cell / interfered cell determination block 460 to the interference control determination block 470. In process S2, the management device may obtain the cell determination information for determining the interference source cell / interfered cell to determine the interference control. The determination information may include at least one of the interference source cell / interfered cell relationship between the cells, the signal strength measured by the sequence, and the interference source cell distance determined by the sequence.

[0092] Process S3 may include sending atmospheric interference information from the interference measurement block 452 to the interference control determination block 470. In process S3, the management device may receive atmospheric interference information from the base station. The atmospheric interference information may include at least one of the presence or absence of atmospheric interference in the corresponding cell and a representative interference distance. The representative interference distance may indicate the longest cell distance between the interfered cell and the interferer cell. Alternatively, the representative interference distance may indicate the shortest cell distance between the interfered cell and the interferer cell.

[0093] Process S4 may include sending interference control information from the interference control determination block 470 to the interference control block 453. In process S4, the management device may send interference control information to each cell. The interference control information may indicate the interference control state of each cell of the interference source cell and the interference avoidance state of each cell of the interfered cell. In addition, the interference control information may include the following information to be explained: Fig. 9 and Fig.10 Additional interference control state.

[0094] Process S5 may include transmitting statistical information between the interference source cell / interfered cell determination block 460 and the statistical processing block 480. Process S6 may include transmitting statistical information between the interference control determination block 470 and the statistical processing block 480. In processes S5 and S6, the management device may obtain statistical information. The statistical information may include at least one of interference source cell / interfered cell determination result statistics, interference source cell / interfered cell state determination result statistics, interference measurement result statistics, and time / weather / temperature / humidity / traffic volume statistics.

[0095] Figure 5 FIG. 1 is a flow chart of a base station for measuring atmospheric interference in a wireless communication system according to an embodiment of the present disclosure. Figure 1 base station 120 or base station 110.

[0096] refer to Figure 5 In operation 501, the base station may identify a UL symbol area. Atmospheric interference refers to the influence of a DL signal of at least one other cell entering the UL area of ​​the corresponding cell due to propagation delay on UL communication between the base station and the terminal of the corresponding cell. The base station affected by atmospheric interference may first identify the UL duration to measure such interference.

[0097] The UL duration may be defined according to the communication system. For example, a radio frame in an LTE TDD communication system may include a DL subframe, an SSF, and a UL subframe. As shown in Table 2, the SSF may include a DwPTS, a GP, and an UpPTS. The UL duration may include symbols of the UpPTS or symbols of the UL subframe. For example, the DL-UL mode in an NR TDD communication system may be set per cell. The duration for applying the DL-UL mode may include a DL duration and a UL duration. The UL duration may be determined by the number of UL slots, the number of UL symbols, or the number of UL slots and UL symbols (which are defined backwards in the period of the DL-UL mode).

[0098] The base station may identify a UL symbol region for measuring atmospheric interference in the UL duration. For example, the base station may identify an M corresponding to the beginning portion of the UL time region. 1 -ary(M1 Dimension) symbol (where M 1 is a natural number). For example, the base station may identify the M periodically allocated in the UL time domain. 2 -ary(M 2 Dimension) symbol (where M 2 is a natural number). For example, the base station may identify the M dynamically allocated in the UL time domain. 3 -ary(M 3 Dimension) symbol (where M 3 is a natural number).

[0099] In operation 503, the base station may measure a sequence. The base station may measure a sequence of a DL signal sent from another cell in a UL symbol region. In some embodiments of the present disclosure, the DL signal sent from another cell may be a signal defined in a communication standard. For example, a signal sent from another cell may include a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation-RS (DM-RS), a beam reference signal (BRS), a beam refinement reference signal (BRRS), a synchronization signal (SS), and at least one of SS / physical broadcast channel (PBCH) blocks. In some other embodiments of the present disclosure, a DL signal sent from another cell may be a signal set by an operator or a network provider. For example, a signal sent from another cell may have a separately defined sequence, and the sequence and the resource region (time-frequency resource) in which the sequence is sent may be defined differently by cell.

[0100] The metrics used to measure the base station signal may include, for example, reference signal received power (RSRP), beam reference signal received power (BRSRP), reference signal received quality (RSRQ), received signal strength indicator (RSSI), signal to interference and noise ratio (SINR), carrier to interference and noise ratio (CINR), SNR, error vector magnitude (EVM), bit error rate (BER) and block error rate (BLER) at least one. In addition, other terms with equivalent technical meanings or other metrics indicating channel quality may be used. The signal of another cell measured at the base station may interfere with the cell of the base station.

[0101] Based on the channel quality of the signal of another cell, the base station can measure the interference of the corresponding cell. For example, the base station can determine the amount of interference from another cell based on the signal strength of the sequence of another cell. According to an embodiment of the present disclosure, the base station can store and manage the measured amount of interference as a value based on the metric used for measurement. According to an embodiment of the present disclosure, the base station can identify a specific interference level in the interference level based on the measured metric, and store and manage the identified interference level.

[0102] The base station can identify the cell that sends the sequence by receiving the sequence. The cells of the network can use their defined resources (e.g., time resources, frequency resources, time-frequency resources) to send and receive the defined sequence. In some embodiments of the present disclosure, the base station can identify the cell that sends the signal based on the resource information of the received signal (e.g., time information (frame, subframe, symbol, cycle), frequency information (bandwidth part (BWP), resource block (BWP), subband)). In some embodiments of the present disclosure, the base station can identify the cell that sends the signal based on the sequence information of the received signal (e.g., OCC information applied to the sequence, sequence type, sequence length). In some embodiments of the present disclosure, the base station can identify the cell that sends the signal based on a combination of sequence information and resource information. For example, assume that the first cell sends a sequence and then the second cell receives the sequence. In order to identify a specific cell from the sequence, the second cell can obtain the sequence information sent by each cell or the resource information used for sequence transmission in advance. The second cell can identify the first cell among multiple cells based on at least one of the sequence information of the first cell and the resource information of the sequence of the first cell. In this article, the first cell can be an interference source cell, and the second cell can be an interfered cell.

[0103] In operation 505, the base station may generate a measurement result. By measuring the sequence, the base station may identify a potential interference source cell. For example, the base station may identify an interfering cell based on the sequence. The measurement result may include interference information. The base station may identify at least one interfering cell that affects the base station based on the sequence of each cell. For example, the base station may generate a measurement result including cell information indicating interference from the measurement result of operation 503.

[0104] By measuring the sequence of DL signals of the cell, the base station can generate the measurement result of atmospheric interference. The atmospheric interference caused by the propagation delay of the DL signal decays over time. Therefore, in the UL symbol area, there may be a difference between the interference amount measured relatively early and the interference amount measured later.

[0105] Since the degree of interference varies based on time, the base station can generate measurement results in various ways. In some embodiments of the present disclosure, the measurement results may include the presence or absence of atmospheric interference. Based on the measurement results of operation 503, the base station can determine the presence or absence of atmospheric interference in the cell of the base station. According to an embodiment of the present disclosure, the base station can determine the interference level of the first N-dimensional (N-ary) (where N is a natural number) symbols of the symbols of the UL symbol area. If the interference level exceeds a first threshold, the base station can determine the presence of atmospheric interference. According to another embodiment of the present disclosure, the base station can determine the first N dimensional (N-ary) (where N is a natural number) symbols of the symbols of the UL symbol area. 1 -ary symbol (where N 1is a natural number) (hereinafter referred to as the first interference level of the beginning part), and the last N symbols of the UL symbol area 2 -ary symbol (where N 2 is a natural number) (hereinafter referred to as the end part). If the difference between the first interference level and the second interference level is greater than the second threshold, the base station can determine the presence of atmospheric interference. It is necessary to consider time-based interference changes because, in addition to atmospheric interference, there may also be interference with other cells. According to another embodiment of the present disclosure, if the interference level of the first N-ary symbols of the symbol of the UL symbol area exceeds the first threshold, and the difference in interference levels between the start part and the end part of the symbol of the UL symbol area exceeds the second threshold, the base station can determine the presence of atmospheric interference in the corresponding cell. This is because it is necessary to measure the presence or absence of interference more accurately based on multiple conditions.

[0106] In some embodiments of the present disclosure, the measurement result may include the degree (or amount) of atmospheric interference. Based on the measurement result of operation 503, the base station may determine the degree of atmospheric interference on the cell of the base station. According to an embodiment of the present disclosure, the degree of atmospheric interference may be determined based on the interference level of the N-ary symbol corresponding to the beginning of the UL symbol area. For example, as the received signal strength of the signal measured from the N-ary symbol increases, the base station may increase the interference level of the atmospheric interference. According to another embodiment of the present disclosure, the atmospheric interference may be determined based on the N-ary symbol corresponding to the beginning of the UL symbol area. 1 -ary symbol of the first interference level and N 2 -ary symbol to determine the degree of atmospheric interference. 1 -ary symbol measured for a signal with a received signal strength higher than that for N 2 -ary symbol measures the received signal strength of the signal, then the base station can add the interference level of atmospheric interference.

[0107] In some embodiments of the present disclosure, the measurement result may include an atmospheric interference distance. During long-term transmission on a radio channel, the DL signal causing atmospheric interference attenuates in signal strength. The base station may determine the atmospheric interference distance based on the measurement result of operation 503. The atmospheric interference distance may be related to the distance between cells. In order to determine the atmospheric interference distance, the base station may divide the UL symbol area into two groups. For example, the UL symbol area may include M-ary symbols, and the symbols of the UL symbol area may correspond to [0, ..., M-1]. The two groups may include a first group corresponding to the beginning of the UL symbol area and a second group corresponding to the end of the UL symbol area. For example, the first group may include symbols [0, ..., m-1] of the UL symbol area, and the second group may include symbols [m, ..., M-1] of the UL symbol area. By adjusting the value m, the base station may identify m that maximizes the difference between the interference level of the first group and the interference level of the second group. For example, the first group may include symbols [nK, n-K+1 ..., n-1] of the UL symbol area, and the second group may include symbols [n, ..., n+K-1] of the UL symbol area. By adjusting the value n, the base station can identify n that maximizes the difference between the interference level of the first group and the interference level of the second group. The base station can determine the interference distance based on the difference in the time resources of the DL resources and the atmospheric interference. The interference distance can be referred to as the cell distance, the cell interference distance, and the atmospheric interference distance. For example, the base station can determine the interference distance based on the end portion of the DL duration (e.g., the last symbol of the DwPTS) and the end portion of the atmospheric interference (e.g., symbol m). According to an embodiment of the present disclosure, the threshold for determining the presence or absence of atmospheric interference in the aforementioned embodiment can be determined based on the interference distance.

[0108] According to an embodiment of the present disclosure, the interference distance may be used to determine the interference source cell / interfered cell of the cell. For example, the interference distance information may be used as data to determine the existence or non-existence of the interference source cell / interfered cell. For example, if the interference distance is greater than the distance of the interferer of the main interference (dominant interference) on the interfered cell, the interfered cell may not determine the interferer as the interference source cell.

[0109] In some embodiments of the present disclosure, the measurement result may include the number of interference sources interfering with a measured cell. For example, the base station may determine the number of interferer cells (hereinafter referred to as interfering cells) based on the measurement result of operation 503. The interfering cell may be an interference source cell. The base station may measure a sequence of a specific cell to determine whether the specific cell acts as an interferer. The base station may generate a measurement result including interfering cell information.

[0110] Can be repeated Figure 5In some embodiments of the present disclosure, the base station periodically performs the following operations according to the measurement period: Figure 5 The base station may periodically generate measurement results and send the measurement results to the management device.

[0111] Despite Figure 5 Although not shown in FIG. 1 , the base station may send the measurement result to the management device. The management device may collect atmospheric interference information for each cell. By collecting atmospheric interference information from the base station, the management device may control atmospheric interference. An embodiment for controlling atmospheric interference is described in Figures 6 to 10 Described in.

[0112] Figure 6 The flowchart of a management device for determining an interference source cell and / or an interfered cell in a wireless communication system according to an embodiment of the present disclosure is shown. Figure 1 management device 130.

[0113] refer to Figure 6 In operation 601, the management device may obtain a measurement result. The measurement result may correspond to Figure 5 The management device may obtain the measurement results of operation 505. The management device may obtain the measurement results from each base station. The management device may obtain multiple measurement results of multiple cells. For example, in a centralized network in which a management device is connected to multiple base stations, the management device may collect measurement results from each base station. For example, in a distributed network in which the management device is located at a specific base station and other base stations share measurement results with the specific base station, the management device may collect measurement results from each base station. According to an embodiment of the present disclosure, the management device may be located at a specific base station and only obtain measurement results of the specific base station. For example, the management device may be located at a base station of an interfered cell and only obtain measurement results of the interfered cell.

[0114] In operation 603, the management device may determine an interference source cell and / or an interfered cell. The management device may identify the interference source cell and the interfered cell as cells for interference management (hereinafter referred to as interference management cells). The interference management cell may refer to a cell on which interference control is performed according to various embodiments of the present disclosure. The interference source cell and the interfered cell are relative. The interfered cell is interfered with by atmospheric interference, and the interference source cell refers to a corresponding cell designated as an interferer of atmospheric interference. The management device may identify the interference source cell to mitigate interference, or identify the interfered cell to avoid interference. For example, the interference management cell may be an interference source cell or an interfered cell. Now, for interference control, determining which cell is an interference source cell or an interfered cell may be referred to as determining the interference source cell / interfered cell.

[0115] The management device may determine the interference source cell / interfered cell for each cell. The management device may identify the interference source cell among multiple cells based on the measurement results. In addition, the management device may identify the interfered cell among multiple cells based on the measurement results. The cell may or may not be an interference source cell. This cell may or may not be an interfered cell. For example, the management device may determine which cell is an interference source cell, an interfered cell, an interference source cell and an interfered cell, or neither an interference source cell nor an interfered cell.

[0116] In some embodiments of the present disclosure, based on the measurement results of each cell, the management device may identify at least one interference management cell among the cells of the network. For example, the management device may determine the interference source cell / interfered cell only in some cells of the network, rather than determining the interference source cell / interfered cell in all cells of the network. According to an embodiment of the present disclosure, the management device may determine the interference source cell / interfered cell relative to the cell with atmospheric interference. For example, the management device may receive the measurement result from the first cell. The measurement result of the first cell may include information indicating atmospheric interference in the first cell, and information indicating that the interference source cell causing atmospheric interference on the first cell is the second cell and the third cell. The management device may determine the first cell as a candidate cell. For example, the management device may receive the measurement result from the fourth cell. The fourth cell may not be subject to atmospheric interference. The management device may exclude the fourth cell from the candidate cells.

[0117] As described above, the management device can improve the efficiency of interference control by including only some cells in the interference control instead of controlling the interference of all cells. For example, if a sequence for determining the presence or absence of atmospheric interference is defined, the resources allocated for the sequence can be reduced by including only specific cells in the interference control. In addition, as the number of candidates for reducing the sequence decreases, the interference source cell can be more easily identified. For example, by including only specific cells in the interference control, the interference in the UL reception of at least one other cell can be reduced. In addition, by including only specific cells in the interference control, the power used to calculate the sequence can be reduced.

[0118] Despite Figure 6 Although not shown in the figure, according to various embodiments of the present disclosure, the management device may store the relationship between the interference source cell and the interfered cell and various metrics based on the measurement results. For example, the relationship between the interference source cell and the interfered cell may be defined as shown in the following table.

[0119] Table 3

[0120]

[0121]

[0122] The relationship between the interferer cell and the interfered cell may be asymmetric. For example, if the first cell is the interferer cell and the second cell is the interfered cell, this does not always mean that the second cell is the interferer cell and the first cell is the interfered cell. Therefore, the management device can manage the relationship of the cells by separating the interferer cell and the interfered cell. The signal strength can be the power of the received sequence, that is, the interference level determined by the received strength or the received sequence. The distance can be determined based on the position of the transmitted symbol of the sequence and the sequence reception time.

[0123] Despite Figure 6 Although not shown in the figure, the management device can determine the interference source cell / interference victim cell of each cell and then notify each cell of the determination result. Figure 6 When determining the interference source cell / interfered cell by interference measurement in the process, the base station of each cell can determine the interference source cell / interfered cell. According to an embodiment of the present disclosure, the base station of each cell can identify the interference source cell and the interfered cell based on the measurement result, and send the identified cell information to the management device. The management device can perform Figures 7 to 10 of interference control, which will be explained later.

[0124] Figure 7 FIG. 1 is a flow chart of a management device for controlling interference in a wireless communication system according to an embodiment of the present disclosure. Figure 1 Although the following describes the operation of the management device for controlling atmospheric disturbances, Figure 7 At least part of the operations may be performed at a base station.

[0125] refer to Figure 7 In operation 701, the management device may identify a cell for interference management. For example, the management device may identify an interference management cell. The interference management cell may indicate a cell for determining interference control. The management device may identify an interference source cell or an interfered cell for interference control.

[0126] In operation 703, the management device may determine whether to control the interference of the interference management cell. Interference control according to various embodiments of the present disclosure may include interference control of the interference source cell and interference control of the interfered cell. Since the interference source cell works as an interferer, it is necessary to reduce the impact of the signal sent on the interference source cell. Therefore, the interference control of the interference source cell can be referred to as interference mitigation. Since the interfered cell is affected by the interferer in data communication, it is necessary to reduce the data communication in the cell carrier. Therefore, the interference control of the interfered cell can be referred to as interference avoidance.

[0127] In some embodiments of the present disclosure, the management device may selectively mitigate the interference of some interference source cells instead of mitigating the interference of all interference source cells. For example, if the DL scheduling area for all interference source cells is reduced, the loss in resource efficiency increases. The management device may identify at least one interference source cell for interference mitigation. If the interference source cell satisfies the conditions for performing interference mitigation (hereinafter referred to as interference mitigation conditions), the management device may determine to mitigate the interference of the interference source cell as interference control. Specific examples of interference mitigation conditions will be described in Fig. 8A Described in.

[0128] In some embodiments of the present disclosure, the management device may selectively perform interference avoidance on some interfered cells instead of performing interference avoidance on all interfered cells. For example, if all interfered cells are switched to another carrier, the cell capacity of the interfered cells is severely reduced, and after the atmospheric interference is eliminated, some cells are switched again, resulting in ping-pong. The management device may identify at least one interfered cell for interference avoidance. If the interfered cell satisfies the conditions for performing interference avoidance (hereinafter referred to as the interference avoidance conditions), the management device may determine to avoid interference of the interfered cell as interference control. Specific examples of interference avoidance conditions will be described in detail in the following. Figure 8B Described in.

[0129] If interference control is required, the management device may perform operation 705. If interference control is not required, the management device may complete the interference control.

[0130] In operation 705, the management device may perform interference control. For interference control, the management device may send an interference control command to the base station of each cell. For example, the management device may send an interference mitigation command to the base station of the interference source cell. For example, the management device may send an interference avoidance command to the base station of the interfered cell. According to an embodiment of the present disclosure, the management device may send the command to the interference source cell and send the command to the interfered cell at the same time. This is because it is necessary to manage the interference source cell and the interfered cell with an inevitable relationship with the same setting. According to another embodiment of the present disclosure, the management device may send the command to the interference source cell at a specific time and send the command to the interfered cell at other times. One interference source cell may include multiple interfered cells, or multiple interference source cells may include one interfered cell.

[0131] According to various embodiments of the present disclosure, a management device may mitigate atmospheric interference of an interference source cell. The management device may send a control command for explicit or implicit interference mitigation to a base station of the interference source cell. In some embodiments of the present disclosure, the management device may reduce the DL duration of the interference source cell. For example, in an LTE TDD communication system, the management device may change the DL-UL configuration of Table 1 or the SSF configuration of Table 2. By shortening the DL time, the management device may minimize the DL signal of the interference source cell entering the UL signal area of ​​the interfered cell. For example, the management device may change the SSF configuration #7 of the interference source cell with SSF configuration #5. As the number of symbols of the DwPTS is reduced from ten to three, the DL scheduling time may be reduced. As the difference between the symbol carrying the DL signal of the interference source cell and the UL duration of the interfered cell increases, atmospheric interference may be reduced. For example, in an NR TDD communication system, the management device may change the DL-UL mode of the interference source cell. The management device may control the number of DL time slots in the DL-UL mode of the interference source cell to be lower than a threshold. For example, the management device may change the number of DL symbols in the flexible time slot of the DL-UL mode from five to one. By reducing the number of DL symbols of the interference source cell, the management device can reduce the impact of atmospheric interference of the interference source cell.

[0132] In some embodiments of the present disclosure, the management device may reduce the transmit power of the interference source cell. The management device may send a transmit power reduction command to the base station of the interference source cell. As the transmit power of the interference source cell is reduced, the coverage of the interference source cell may be reduced. As the coverage of the DL signal of the interference source cell is reduced, the received power of the DL signal sent to the interfered cell may also be reduced. Therefore, due to the reduction in transmit power, the interference on the interfered cell can be reduced.

[0133] In some embodiments of the present disclosure, the management device may adjust the antenna configuration of the interference source cell. The DL signal may be sent via the antenna of the base station of the interference source cell. The management device may send an antenna configuration for reducing the coverage of the interference source cell to the base station of the interference source cell. For example, the antenna configuration may include antenna tilt. By adjusting the radiation angle of the DL signal, the propagation distance of the DL signal of the interference source cell may be reduced. For example, the antenna configuration may include the number of antennas used. By reducing the number of antennas, the propagation distance of the DL signal of the interference source cell may be reduced.

[0134] In some embodiments of the present disclosure, the management device may reduce the scheduling of the interference source cell. The management device may reduce or stop the ratio of DL scheduling of the interference source cell to the base station of the interference source cell. For example, in order to reduce the influx of DL signals, the management device may reduce the size of the frequency region allocated to the DL signal. For example, the management device may set the size of the frequency region of the subframe (or DL ​​time slot) allocated to the end part in the TDD communication system to be lower than the reference value (e.g., six PRBs). For example, the management device may send a command to the base station for limiting the DL scheduling in the last DL time slot of the DL duration of the DL-UL mode.

[0135] According to various embodiments of the present disclosure, the management device may control the interfered cell to avoid atmospheric interference. The management device may send a control command for explicitly or implicitly avoiding interference to the base station of the interfered cell. In some embodiments of the present disclosure, the management device may control the base station of the interfered cell to switch. The terminal of the interfered cell may send a UL signal to the base station. In this way, due to atmospheric interference, the base station may not be able to successfully receive the UL signal. The management device may send a control command to the base station to switch the terminal of the interfered cell to another cell, thereby minimizing the impact of atmospheric interference. The base station may send a switching command message to the terminal whose link quality on the interference source cell is lower than a threshold. The terminal may switch to a cell of at least one other carrier frequency.

[0136] In some other embodiments of the present disclosure, the management device may change the DL-UL mode of the interfered cell. In order to reduce the UL scheduling area in the interfered cell, the management device may change the DL-UL mode in the flexible time slot. The start of the UL symbol in the changed DL-UL mode may lag behind the start of the UL symbol in the original DL-UL mode in time.

[0137] In some other embodiments of the present disclosure, the management device may change the time slot format of at least one terminal of the interfered cell. The time slot format may be dynamically configured at the terminal. The management device may change the time slot format of at least one terminal (e.g., a terminal whose channel quality is lower than a threshold) in the interfered cell by controlling the base station of the interfered cell. The number of UL symbols of the changed time slot format may be less than the number of UL symbols of the original time slot format. By controlling the interference of some terminals that are individually affected by atmospheric interference, the management device may effectively avoid interference to the interfered cell.

[0138] In some other embodiments of the present disclosure, the management device may control the setting of an additional UL carrier to the terminal of the interfered cell. For example, the management device may send a control command to the base station to configure the supplementary uplink carrier (supplementary uplink carrier, SUL) of the NR system on the interfered cell. In addition to the DL / UL carrier of the interfered cell, the base station may set an additional UL carrier to the terminal. The terminal may send UL services to the base station on the additional UL carrier. According to an embodiment of the present disclosure, the base station may adaptively set an additional UL carrier based on the channel quality of the terminal. If the channel quality of the terminal is lower than a threshold due to atmospheric interference, the base station may set an additional UL carrier.

[0139] In order to facilitate the interference control of the present disclosure, an interference control state may be defined. An interference control state may be defined for each cell. An interference control state may be set for an interference source cell or an interfered cell. In some embodiments of the present disclosure, the interference control state may indicate whether to control the interference of the cell. According to an embodiment of the present disclosure, if the interference control state of a cell is 1, the management device may control the interference of the corresponding cell. For example, if the corresponding cell is an interference source cell, the management device may limit the scheduling of the interference source cell in the DL time slot. For example, if the corresponding cell is an interfered cell, the management device may control the base station of the interfered cell to switch the interfered cell to another target cell in the UL time slot. If the interference control state of the cell is 0, the management device may not control the interference of the corresponding cell.

[0140] In some other embodiments of the present disclosure, the interference control state may indicate the interference control degree of the cell. Multiple levels for interference control are defined, and each level may be distinguished by the amount of interference or the degree of avoidance that is sequentially mitigated. According to an embodiment of the present disclosure, if the interference control state of the cell is the first level, the management device may not control the interference of the corresponding cell. If the interference control state of the cell is the second level, the management device may control the interference of the corresponding cell. For example, if the corresponding cell is an interference source cell, the management device may limit the scheduling of one DL symbol. If the interference control state of the cell is the third level, the management device may perform additional operations for interference control of the corresponding cell. For example, if the corresponding cell is an interference source cell, the management device may limit the scheduling of additional DL symbols after one DL symbol.

[0141] Despite Figure 7 Not shown, but can be repeated Figure 7 An operation used to determine whether to control interference.

[0142] In some embodiments of the present disclosure, the management device may periodically execute Figure 7In this paper, it can be independent of Figure 5 The control period is set based on the measurement period of the control period. The type of interference control can be determined based on the length of the control period. For example, if the control period is longer than the reference period, the management device can change the antenna configuration of the base station, or change the antenna direction of the base station. For example, if the control period is shorter than the reference period, the management device can change the UL / DL configuration of the TDD frame, or dynamically change the DL-UL mode of the TDD configuration information. In other words, the management device can determine whether to change the long-term or short-term characteristics of the cell according to the control period. For example, relatively long-term characteristics may include changes in antenna configuration, DL-UL mode settings through RRC, changes in UL / DL configuration, and changes in SSF configuration through RRC. Relatively short-term characteristics may include DL scheduling, and DL / UL symbol settings of downlink control information (DCI) in time slots (e.g., dynamic TDD). These long-term / short-term characteristics are exemplary, and the management device can group various interference control schemes based on the period, and manage appropriate group control schemes for the control period.

[0143] According to various embodiments of the present disclosure, the management device may determine the time period of the interference source cell / interferenced cell (for example, Figure 4A The process 403, Figure 4B The interference source cell / interfered cell determination block 460) is used to distinguish the type of interference control operation of the interference source cell. For example, if the interference source cell / interfered cell is determined or the interference control (e.g., Figure 7 Operation 703) is performed over a short period of time, the management device can perform interference control operations that have a relatively small impact on the network, such as DwPTS length reduction, scheduling suspension, and allocated RB reduction. For example, if the interference source cell / interfered cell is determined or the interference control (e.g., Figure 7 If the operation 703 of the present invention is performed over a relatively long period of time, the management device may perform interference control operations that exert a relatively large impact on the network, such as antenna tilt control, power control, and azimuth control. For example, based on the determination period or the interference control period, the management device may identify at least one of the interference mitigation or avoidance operations. According to an embodiment of the present disclosure, a group of interference control operations based on the impact on the network may be predefined.

[0144] In some other embodiments of the present disclosure, the management device may execute, in response to a specific event or request, that is, on demand. Figure 7 Interference control operation.

[0145] The management device can control interference by considering additional information in addition to the measurement results. For example, the management device can control interference based on statistical information (e.g., interference source cell / interfered cell determination results, key performance indicator (KPI) information). For example, the management device can control interference based on environmental information (e.g., weather, climate, temperature, humidity, geography). For example, the management device can control interference based on instantaneously acquired information (e.g., channel information). According to an embodiment of the present disclosure, the control period can be set based on the period for acquiring additional information.

[0146] Fig. 8A The flowchart of a management device for controlling interference related to an interference source cell in a wireless communication system according to an embodiment of the present disclosure is shown. Figure 1 management device 130.

[0147] refer to Fig. 8A In operation 801, the management device may identify an interference management cell. The interference management cell may indicate a cell used to determine whether to control interference. The management device may identify at least one interference management cell among multiple cells based on the measurement results of the cells. Next, the management device may perform interference control on each interference management cell. The interference management cell may be an interference source cell or an interfered cell.

[0148] In operation 803, the management device may determine whether the interference management cell is an interference source cell. If the interference management cell is an interference source cell, the management device may perform operation 805. If the interference management cell is not an interference source cell, the management device may complete interference control.

[0149] In operation 805, the management device may determine whether the interference mitigation condition is met. The management device may determine whether the interference source cell meets the interference mitigation condition. The interference mitigation condition indicates a condition for determining whether it is necessary to mitigate the interference of the interference source cell. Interference can be mitigated by always limiting the signal of the interference source cell. However, it is effective in scheduling because the signals of all interference source cells are limited, and the cell capacity may be reduced due to excessive reduction in coverage. Therefore, the management device according to various embodiments needs to selectively mitigate the interference of the interference source cell based on the interference mitigation condition.

[0150] In some embodiments of the present disclosure, the management device may determine whether the interference mitigation condition is met based on the number of interfered cells of the interference management cell. For example, if the number of interfered cells of the interference management cell exceeds X (X is a non-zero integer), the management device may determine that the interference mitigation condition is met. By selectively mitigating the interference of the interference source cell that interferes with many interfered cells, unnecessary reduction of DL capacity can be prevented. If necessary, thresholds can be set for different purposes. For example, the management device may set X to zero, where all interference source cells meet the interference mitigation condition. For example, the management device may set X to the number of cells to disable interference mitigation of the interference source cell.

[0151] In some other embodiments of the present disclosure, the management device may determine whether the interference mitigation condition is met based on the amount of interference of the interference management cell on the interfered cell. The management device may obtain measurement results from each base station. The measurement results may include interference information measured in the cell. The interference information may include interfering cell information and interference amount information. Based on the measurement results of each cell, the management device may calculate the total amount of interference of a specific cell to other interference source cells. The management device may determine whether the interference mitigation condition is met based on the total amount of interference of the interference management cell to other (multiple) interference source cells. For example, if the total amount of interference exceeds a threshold, the management device may determine that the interference mitigation condition is met. If the interference is selectively mitigated based only on the number of interfered cells that suffer interference, the interference of the interference source cell to multiple cells is first controlled, and thus the interference of the interference source cell causing strong atmospheric interference can be mitigated later. In order to maximize the effect of interference mitigation, it is necessary to determine whether the interference mitigation condition is met based on the amount of interference of the interfered cell of the interference management cell.

[0152] The management device may differently set the interference mitigation condition when changing the interference control state from on (ON) to off (OFF), and the interference mitigation condition when changing the interference control state from off to on. In some embodiments of the present disclosure, the management device may differently set the threshold of the number of interfered cells when changing the interference control state from on to off, and the threshold of the number of interfered cells when changing the interference control state from off to on. For example, if the interference control state of the interference management cell is on, and the number of interfered cells of the interference management cell exceeds A 1 (A 1 is a non-zero integer), the management device may determine that the interference mitigation condition is met. If the interference control state of the interference management cell is off, and the number of interfered cells of the interference management cell is lower than A 2 (A 2 is a non-zero integer), the management device may determine that the interference mitigation condition is not met. By considering the threshold A of the number of interfered cells 1 and A 2The management device can 1 Set to be greater than A 2 Therefore, the management device can prevent the interference control state of the interference source cell from changing frequently.

[0153] In some other embodiments of the present disclosure, the management device may differently set a first threshold value of the total interference amount of the interference source cell to the (multiple) interfered cell when the interference control state is changed from on to off, and a second threshold value of the total interference amount of the interference source cell to the (multiple) interfered cell when the interference control state is changed from off to on. For example, if the interference control state of the interference management cell is on, and the total interference amount exceeds B 1 dB, the management device can determine that the interference mitigation condition is met. If the interference control state of the interference management cell is off and the total interference amount is lower than B 2 dB, the management device may determine that the interference mitigation condition is not met. Similarly, the management device may consider the threshold B of the total interference amount of the interfering source cell to the (multiple) interfered cells. 1 and B 2 The hysteresis in B 1 Set to be greater than B 2 Therefore, the management device can prevent the interference control state of the interference source cell from changing extremely frequently.

[0154] If the interference mitigation condition is satisfied, the management device may perform operation 807. If the interference mitigation condition is not satisfied, the management device may complete interference control.

[0155] In operation 807, the management device may perform interference control of the interference source cell. The management device may perform control to mitigate the interference of the interference source cell. The management device may reduce the impact of the DL signal of the interference source cell to prevent the DL signal of the interference source cell from entering the UL resource duration of the interfered cell. In order to reduce the impact of the DL signal, the management device may reduce the DL coverage of the interference source cell or the resource area for sending the DL signal. Now, various schemes for mitigating the interference of the interference source are described.

[0156] In some embodiments of the present disclosure, the management device may change the resource configuration of the interference source cell. The resource configuration may indicate the ratio of the UL / DL components in the TDD communication system. For example, in an LTE communication system, the resource configuration may include a TDD UL / DL configuration (e.g., Table 1) and an SSF configuration (e.g., Table 2). For example, the management device may change to an SSF configuration (e.g., SSF configuration #0) of a DwPTS that is shorter than the SSF configuration (e.g., SSF configuration #3) of the current SSF. For example, the resource configuration may include a DL-UL mode of an NR communication system. For example, the resource configuration may include a time slot format of an NR communication system. The time slot format may indicate a format according to the ratio of DL symbols and UL symbols in 14 symbols in a time slot. According to dynamic TDD, the base station may change the symbol ratio of the flexible time slot of at least one terminal.

[0157] In some other embodiments of the present disclosure, the management device may control the power of the interference source cell. The management device may reduce the power threshold of the DL transmission at the base station of the interference source cell. As the transmission power of the interference source cell of the base station decreases, the DL coverage of the interference source cell decreases. As the DL coverage decreases, the DL signal of the interference source cell may not be able to reach the interfered cell that is physically far away (e.g., tens or hundreds of kilometers away).

[0158] In some other embodiments of the present disclosure, the management device may change the antenna configuration of the interference source cell. The antenna configuration may be an antenna configuration for radiating DL signals. The antenna configuration may include the number of antennas and antenna direction (e.g., azimuth) settings. For example, the management device may control the base station of the interference source cell to reduce the number of antennas or lower the antenna direction. As the DL coverage range decreases, the DL signal of the interference source cell may not be able to physically reach the interfered cell.

[0159] In some other embodiments of the present disclosure, the management device may change the scheduling of the interference source cell. The management device may limit the scheduling or reduce the entire resource area scheduled in the DL duration of the interference source cell. For example, the management device may reduce the scheduling of the (multiple) last E-ary (E-dimensional) symbols in the DL duration. Since the last DL symbol of the DL duration in the TDD resource structure is relatively closest to the start symbol of the UL resource area, the signal of the DL symbol is likely to enter the UL resource area of ​​the interfered cell. For example, the management device may set the frequency area of ​​the E-ary symbol to the minimum (e.g., 6 PRBs). For example, the management device may not perform DL scheduling on the E-ary symbol.

[0160] In some other embodiments of the present disclosure, the management device may suspend scheduling of the interference source cell. If the interference source cell interferes with multiple interfered cells and the interference amount is quite large, the management device may reduce interference to the interfered cell by suspending scheduling of the interference source cell.

[0161] Figure 8B The flowchart of a management device for controlling interference associated with an interfered cell in a wireless communication system according to an embodiment of the present disclosure is shown. Figure 1 management device 130.

[0162] refer to Figure 8B In operation 851, the management device may identify an interference management cell. The management device may identify at least one interference management cell among a plurality of cells based on the measurement results of the cells. Operation 851 corresponds to Fig. 8A Operation 801 is described above, and thus the same and similar descriptions thereof may be omitted.

[0163] In operation 853, the management device may determine whether the interference management cell is an interfered cell. If the interference management cell is an interfered cell, the management device may perform operation 855. If the interference management cell is not an interference source cell, the management device may complete interference control.

[0164] In operation 855, the management device may determine whether the interference avoidance condition is met. The management device may determine whether the interfered cell meets the interference avoidance condition. The interference avoidance condition refers to a condition for determining whether it is necessary to avoid interference in the interfered cell. The impact of atmospheric interference can be avoided by limiting UL scheduling or avoiding interference (such as switching) in the interfered cell. However, switching all interfered cells or limiting scheduling will not only result in unnecessary switching, but will also excessively reduce the cell capacity of the interfered cell. Therefore, the management device according to various embodiments needs to selectively avoid interference in the interfered cell based on the interference avoidance condition.

[0165] In some embodiments of the present disclosure, the management device may determine whether the interference avoidance condition is met based on the number of interference source cells of the interference management cell. For example, if the number of interference source cells of the interference management cell exceeds Y (Y is a non-zero integer), the management device may determine that the interference avoidance condition is met. By selectively avoiding interference to an interfered cell that is interfered by many interferer cells, unnecessary reduction of UL capacity can be prevented. If necessary, thresholds can be set for different purposes. For example, the management device may set Y to zero, where all interfered cells meet the interference avoidance condition. For example, the management device may set Y to the number of the entire cell to disable interference avoidance of the interfered cell.

[0166] In some other embodiments of the present disclosure, the management device may determine whether the interference avoidance condition is met based on the amount of interference of the interference management cell from the interference source cell. The management device may obtain measurement results from each base station. The measurement results may include interference information measured in the cell. The interference information may include interference cell information and interference amount information. Based on the measurement results of each cell, the management device may calculate the total amount of interference of a specific cell from another interference source cell. The management device may determine whether the interference avoidance condition is met based on the total amount of interference of the interference management cell from another (multiple) interference source cell. For example, if the total amount of interference exceeds a threshold, the management device may determine that the interference avoidance condition is met. If interference is selectively avoided based only on the number of interference source cells causing interference, the interference of the interfered cell suffering from multiple cells is first controlled, so that the interference of the interfered cell suffering from strong interference can be avoided afterwards. In order to maximize the effect of interference avoidance, it is necessary to determine whether the interference avoidance condition is met based on the amount of interference of the interference source cell of the interference management cell.

[0167] In some other embodiments of the present disclosure, the management device may determine whether the interference avoidance condition is met according to whether there is atmospheric interference in the interference management cell.

[0168] If the interference of the interference source cell is controlled, there is no atmospheric interference on the interfered cell, or the amount of atmospheric interference may be reduced. Therefore, it may not be necessary to determine whether to avoid interference based solely on the number of interference source cells or the amount of interference of the interference source cell. Therefore, the management device can determine whether the interference avoidance condition is met based on the presence or absence of atmospheric interference in the UL symbol area of ​​the interference management cell. For example, the management device can identify the latest measurement results of the interfered cell. If there is atmospheric interference in the interfered cell, the management device can determine that the interference avoidance condition is met. For example, the management device can request the interfered cell to measure atmospheric interference. The management device can receive the measurement results of atmospheric interference from the interfered cell. If there is atmospheric interference in the interfered cell, the management device can determine that the interference avoidance condition is met. For example, the management device can obtain the amount of atmospheric interference of the interfered cell from the latest measurement results of the interfered cell. If the amount of atmospheric interference exceeds a threshold, the management device can determine that the interference avoidance condition is met. The management device can reduce unnecessary interference control of the interfered cell by considering the amount of atmospheric interference.

[0169] The management device may set the interference avoidance condition when changing the interference control state from on to off and the interference avoidance condition when changing the interference control state from off to on differently. In some embodiments of the present disclosure, the management device may set the threshold of the number of interference source cells for changing the interference control state from on to off and the threshold of the number of interference source cells for changing the interference control state from off to on differently. For example, if the interference control state of the interference management cell is on and the number of interference source cells of the interference management cell exceeds C 1 (C 1 is a non-zero integer), the management device may determine that the interference avoidance condition is met. If the interference control state of the interference management cell is off, and the number of interference source cells of the interference management cell is lower than C 2 (C 2 is a non-zero integer), the management device may determine that the mitigation avoidance condition is not met. By considering the threshold C of the number of interfered cells 1 and C 2 The management device can 1 Set to greater than C 2 Therefore, the management device can prevent the interference control state of the interfered cell from changing too frequently.

[0170] In some other embodiments of the present disclosure, the management device may differently set a first threshold of the total amount of interference of the interfered cell caused by (multiple) interference source cells when the interference control state is changed from on to off, and a second threshold of the total amount of interference of the interfered cell caused by (multiple) interference source cells when the interference control state is changed from off to on. For example, if the interference control state of the interference management cell is on, and the total amount of interference exceeds D 1 dB, the management device can determine that the interference avoidance condition is met. If the interference control state of the interference management cell is off and the total interference amount is lower than D 2 dB, the management device may determine that the interference avoidance condition is not met. Similarly, the management device may consider the threshold D of the total interference amount of the interfered cell caused by the interferer cell. 1 and D 2 The hysteresis of D 1 Set to be greater than D 2 Therefore, the management device can prevent the interference control state of the interfered cell from changing extremely frequently.

[0171] If the interference avoidance condition is satisfied, the management device may perform operation 857. If the interference avoidance condition is not satisfied, the management device may complete interference control.

[0172] In operation 857, the management device may perform interference control of the interfered cell. The management device may perform control to mitigate interference of the interfered cell. In order to prevent the DL signal of the interference source cell from affecting the UL transmission of the interfered cell, the management device may change the state of the interfered cell. Now, various schemes for avoiding interference of the interfered cell are described.

[0173] In some embodiments of the present disclosure, the management device may switch the terminal of the interfered cell. The management device may send a control command to the base station of the interfered cell. The control command may be a control message in which the base station of the interfered cell sends a switching command to the terminal in the cell. According to an embodiment of the present disclosure, the base station may send a switching command to the terminal whose channel quality is lower than a threshold among the terminals of the interfered cell. According to an embodiment of the present disclosure, the management device may send a switching message to the terminal in ascending order of channel quality. Therefore, the base station can gradually reduce the impact from the interfering cell. Under the control of the base station, the terminal can switch from the interfered cell to a target cell of at least one other operating frequency. According to an embodiment of the present disclosure, the management device may adjust the parameters for determining whether to switch. The management device may adjust at least one parameter value related to the switching of the interfered cell, rather than explicitly forcing the switching of the interfered cell, so as to relatively facilitate the switching in the cell boundary of the interfered cell.

[0174] In some other embodiments of the present disclosure, the management device may reduce the UL scheduling of the interfered cell. The management device may reduce the impact of atmospheric interference by reducing the UL scheduling of the interfered cell. According to an embodiment of the present disclosure, the management device may prevent the scheduling of (multiple) N-ary UL symbols. For example, in an LTE communication system, the management device may prevent the scheduling of (multiple) first N-ary symbols of the first UL subframe after the SSF. For example, in an NR communication system, the management device may prevent the scheduling of (multiple) first N-ary symbols of the UL time slot. According to an embodiment of the present disclosure, the management device may reduce the scheduling area in the frequency domain during (multiple) UL symbols. For example, the management device may reduce the impact of the management device by reducing the number of PRBs allocated to the terminal of the interfered cell. The management device may control the base station to selectively reduce the scheduling according to the channel quality of the terminal. The management device may send an adaptive scheduling command to the base station. The base station may obtain the channel quality of each terminal and limit the UL scheduling of the terminal in ascending order of channel quality.

[0175] In some other embodiments of the present disclosure, the management device may change the DL-UL mode of the interfered cell. The DL-UL mode of the NR communication system may be set by RRC signaling. The management device may flexibly change the DL-UL mode of the interfered cell. The management device may change the DL-UL mode so as to extend the difference between the end part of the DL duration and the beginning part of the UL duration in the current DL-UL mode of the interfered cell.

[0176] In some other embodiments of the present disclosure, the management device may dynamically change the slot format of the terminal of the interfered cell. The slot format may indicate a combination of DL symbol-flexible symbol-UL symbol of the symbol of the flexible slot. The management device may send a dynamic TDD command to the base station of the interfered cell. The base station may change the slot format by sending DCI (e.g., DCI format 2_0) to at least one terminal. The base station may selectively control terminals with low channel quality. The base station may send DCI to the terminal to allocate UL duration later in the configuration period of the DL-UL mode.

[0177] In some other embodiments of the present disclosure, the management device may set an additional UL carrier for the terminal of the interfered cell. The additional UL carrier may be SUL. The management device may control the base station of the interfered cell to set an additional carrier for at least one terminal to resolve the UL service in the interfered cell. The management device may identify at least one terminal whose channel quality is reduced due to atmospheric interference. By setting the additional UL carrier to the identified terminal, the base station can mitigate the impact of atmospheric interference. The terminal can perform UL transmission on the additional UL carrier, and the impact of interference can be reduced because the additional UL carrier is a different frequency from the DL carrier that sends the atmospheric interference.

[0178] In some other embodiments of the present disclosure, the management device may control the interfered cell to decode the UL signal only in some symbol areas. The base station of the interfered cell may perform channel decoding while reducing or removing the weight of at least one UL symbol including atmospheric interference in the UL duration. In other words, the base station of the interfered cell may obtain a detection result by decoding the received UL signal in a symbol area without atmospheric interference. The atmospheric interference of the UL symbol area may be located at the beginning of the UL duration.

[0179] In some other embodiments of the present disclosure, the management device may perform beam management in the interfered cell. The interference direction may be identified based on the physical locations of the interferer cell and the interfered cell. The management device may control the beam (e.g., receiving beam) of the interfered cell or the beam (e.g., transmitting beam) of the terminal in the interfered cell to not use the beam close to the direction of the interferer cell.

[0180] The base station of the interfered cell may identify the beam information corresponding to the interference direction. The beam information may be indicated by a DL resource (e.g., a CSI-RS resource indicator (CSI-RS resource indicator, CRI), an SSB resource indicator (SSBresource indicator, SSBRI)). According to an embodiment of the present disclosure, the base station of the interfered cell may limit the scheduling of the terminal it serves based on the beam information. For example, the base station of the interfered cell may selectively control the interference of the terminal affected by the atmospheric interference.

[0181] According to an embodiment of the present disclosure, the base station of the interfered cell may control not to use the transmission beam of the terminal associated with the beam information corresponding to the interference direction. For example, the terminal may perform UL beam search using multiple beams. The terminal may send UL signals through beams respectively. The base station may measure the channel quality of the received UL signal and feed back the best beam. In this way, the base station may feed back the beam identified by considering the interference direction instead of the SRS resource with the best channel quality.

[0182] For example, in an NR communication system, the terminal can perform beam search using SRS. The base station can feed back beam information (e.g., SRS resource indicator (SRI)) to the terminal through DCI. The base station can identify the best beam based on the interference direction and the directional information of the received SRS. In the beam search, the UL signal can be repeatedly sent for a specific duration by changing the beam. Since the signal is sent for a specific duration, the influence of atmospheric interference is not easily reflected in the beam search. Therefore, the base station of the interfered cell can identify the direction of the atmospheric interference and exclude some SRS from the feedback target based on the identified direction. Since the transmit beam of the terminal is identified by considering the influence of atmospheric interference, the UL communication can be fundamentally protected from the influence of atmospheric interference.

[0183] Although in Fig. 8A The interference control of the interference source cell is described in Figure 8B The interference control of the interfered cell is described in , but the specific cell may be an interference source cell and an interfered cell. Therefore, according to various embodiments of the present disclosure, the management device may determine whether both the interference mitigation condition and the interference avoidance condition are satisfied for the interference management cell. Fig. 8A Examples and Fig. 8A The embodiments may be implemented in combination.

[0184] Fig. 9 The interference effect based on distance in a wireless communication system according to an embodiment of the present disclosure is shown. The interference may be atmospheric interference. An LTE TDD communication system is described by way of example to explain Fig. 9Based on the effect of distance, it should be noted, however, that the corresponding description is accurate for TDD communication of at least one other communication system. Fig. 9 The description is accurate for the NRTDD communication system.

[0185] refer to Fig. 9 , the network may include a first cell 911, a second cell 912, a third cell 913, and a measurement cell 920. It is assumed that these cells have the same UL / DL configuration and SSF configuration. The SSF configuration may be SSF configuration #7 of Table 2. The length ratio of DwPTS:GP:UpPTS may be 10:2:2. The base station of the first cell 911 may be d away from the base station of the measurement cell 920. 1 The DL signal transmitted in the DwPTS of the first cell 911 may not flow into the UL symbol region (the symbol of the UpPTS and the symbol of the UL subframe) of the measurement cell 920. The base station of the measurement cell 920 may not measure the DL signal of the first cell 911. The first cell 911 is not an interference source cell of the measurement cell 920.

[0186] The base station of the second cell 912 may be spaced d from the base station of the measurement cell 920. 2 .d 2 Can be greater than d 1 Therefore, the propagation delay of the second cell 912 may be greater than the propagation delay of the first cell 911. Due to the larger propagation delay, the time to send the DL signal may also be delayed. The resource structure of the second cell 912 may be moved from the resource structure of the first cell 911 in the time domain by a time corresponding to d 2 -d 1 The propagation delay difference of the second cell 912 is 0.0447. The DL signal sent in the DwPTS of the second cell 912 may enter the UL symbol area (the symbol of the UpPTS and the symbol of the UL subframe) of the measurement cell 920. The base station of the measurement cell 920 may measure the DL signal of the second cell 912, thereby generating a measurement result of the atmospheric interference. The second cell 912 is an interference source cell of the measurement cell 920. The measurement cell 920 is an interfered cell of the second cell 912. According to an embodiment of the present disclosure, the management device may limit the DL scheduling in the DwPTS of the second cell 912.

[0187] The base station of the third cell 913 may be at a distance d from the base station of the measurement cell 920. 3 .d 3 Can be greater than d 2 Therefore, the propagation delay of the third cell 913 may be greater than the propagation delay of the second cell 912. Due to the larger propagation delay, the time to send the DL signal may also be delayed. The resource structure of the third cell 913 may be moved from the resource structure of the second cell 912 in the time domain by as much as d 3 -d2 Corresponding propagation delay difference. The DL signal sent in the DwPTS of the third cell 913 can enter the UL symbol area (symbols of UpPTS and symbols of UL subframe) of the measurement cell 920. The base station of the measurement cell 920 can measure the DL signal of the third cell 913, thereby generating a measurement result of atmospheric interference. The third cell 913 is the interference source cell of the measurement cell 920. The measurement cell 920 is the interfered cell of the third cell 913. Although the management device restricts DL scheduling in the DwPTS of the third cell 913, atmospheric interference may still exist. This is because the DL signal in the DL subframe not only enters the DwPTS of the third cell 913, but also enters the UL symbol area of ​​the measurement cell 920. Therefore, the management device may need to perform additional interference control on the third cell 913. In the following, Fig.10 A specific example of additional interference control based on distance information is provided in.

[0188] Fig.10 FIG. 1 is a flow chart of a management device for controlling interference based on distance in a wireless communication system according to an embodiment of the present disclosure. Figure 1 management device 130. If the interference mitigation and Figure 8B If the interference is avoided, Fig.10 The interference control is interference control that is additionally performed.

[0189] refer to Fig.10 In operation 1001, the management device may obtain cell distance information. The cell distance information may be related to the distance between the interfering cell causing the atmospheric interference (i.e., the interference source cell) and the cell measuring the atmospheric interference (i.e., the interfered cell). According to an embodiment of the present disclosure, the management device may obtain the cell distance information of the interference source cell-interfered cell based on the measurement result of each cell. For example, the base station of the measuring cell may obtain the cell distance information of the interference source cell-interfered cell based on the end part of the atmospheric interference measured in the UL symbol area (e.g., Figure 5m) and the beginning part of the DwPTS to determine the cell distance information. According to another embodiment of the present disclosure, the management device may obtain the cell distance information based on the location information of each base station obtained from the management server. The management device may identify the ID of the interference source cell and the ID of the interfered cell, and determine the physical location difference between the two cells based on the pre-configured location information. Based on the location difference, the management device may obtain the cell distance information. According to another embodiment of the present disclosure, the management device may obtain the cell distance information based on the time difference between sending a symbol of a predefined sequence and receiving the symbol of the sequence. The management device may obtain the sequence resource information of each cell and identify the symbol position of the actually received sequence. Based on the difference between the sent symbol and the received symbol, the management device may obtain the cell distance information. For example, the distance for sending a signal corresponding to 14 symbols may be 300 kilometers. Therefore, if the symbol distance is 14 symbols, the management device may calculate the actual cell distance information as 300 kilometers.

[0190] In operation 1003, the management device may determine whether the cell distance exceeds a threshold. The management device may determine the distance between the interference source cell and the interfered cell from the cell distance information. The management device may specify the interference source cell. The management device may specify the interfered cell. The management device may identify the distance between the interference source cell and the interfered cell, i.e., the cell distance. If the cell distance exceeds the threshold, the management device may perform operation 1005. If the cell distance is below the threshold, the management device may perform additional interference control. If the cell distance is below the threshold, the atmospheric interference is completely mitigated using the existing interference control.

[0191] In operation 1005, the management device may perform additional interference control. If the cell distance exceeds the threshold, the management device may set the additional interference control state of the interference source cell and the additional interference control state of the interfered cell to on.

[0192] In some embodiments of the present disclosure, the management device may perform additional interference mitigation on the interference source cell. For example, if the scheduling of the DwPTS of the interference source cell is restricted, the management device may also restrict the scheduling of the DL frame before the DwPTS of the interference source cell. For example, the management device may not only limit the transmit power in the DwPTS of the interference source cell, but also limit the transmit power in the DL subframe. For example, if the antenna tilt of the interference source cell is reduced by 10 degrees, the management device may further reduce the antenna tilt to 20 degrees. For example, for additional atmospheric interference mitigation, the coverage range may be further reduced. For example, if the frequency scheduling area of ​​the interference source cell is adjusted to W 1 -ary(W 1 W 1is a natural number) PRB, the management device can further reduce the frequency scheduling area of ​​the interference source cell to W 2 -ary(W 2 W 2 is an integer, W 1 <W 2 )PRB. For example, the management device may suspend scheduling.

[0193] In some other embodiments of the present disclosure, the management device may perform additional interference avoidance of the interfered cell. 1 -ary symbol scheduling is restricted in the UL time slot of the interfered cell, the management device can further restrict N 1 N after the -ary symbol 2 -ary symbol scheduling. For example, the management device may control the base station of the interfered cell to additionally send DCI. The additionally sent DCI may indicate a time slot format of a UL symbol area that is shorter than the time slot format indicated by the previously sent DCI. For example, by reducing the UL symbol length in the flexible time slot, the influence of atmospheric interference of the distant interferer cell may be reduced.

[0194] exist Fig.10 In the embodiment, only one threshold is used to determine whether to perform additional interference control. However, additional interference control may be defined, and the management device may differently set additional interference control conditions when the additional interference control state is changed from on to off, and additional interference control conditions when the additional interference control state is changed from off to on.

[0195] According to various embodiments of the present disclosure, the management device may manage the additional interference control state of the interference source cell. In some embodiments of the present disclosure, if the additional interference control state of the interference source cell is off, and the number of interfered cells that are farther away from the interference source cell than the threshold exceeds T 1 (T 1 is a non-negative integer), the management device may set the additional interference control to on. The management device may perform a process for additional interference mitigation of the interference source cell. If the additional interference control state of the interference source cell is on, and the number of interfered cells below the threshold away from the interference source cell is less than T 2 (T 2 is a non-negative integer), the management device may set the additional interference control to off. The management device may perform a process for additional interference mitigation of the interference source cell. According to an embodiment of the present disclosure, T 2 can be set to be less than T 1 The value of can be used to reduce the ping-pong of frequently changing the additional interference control state of the interference source cell.

[0196] In some embodiments of the present disclosure, if the additional interference control state of the interference source cell is off, and the amount of interference of the interference source cell on the interfered cell that is away from the interference source cell and above the threshold exceeds a first threshold, the management device may set the additional interference control state to on. The management device may perform a process for additional interference mitigation of the interference source cell. If the additional interference control state of the interference source cell is on, and the amount of interference of the interference source cell on the interfered cell that is away from the interference source cell and above the threshold is lower than a second threshold, the management device may set the additional interference control state to off. The management device may perform a process for additional interference mitigation of the interference source cell. According to an embodiment of the present disclosure, by taking into account a hysteresis characteristic, the second threshold may be set to a value less than the first threshold.

[0197] According to various embodiments of the present disclosure, the management device may manage the additional interference control state of the interfered cell. In some embodiments of the present disclosure, if the additional interference control state of the interfered cell is off, and the number of interfering source cells that are more than a threshold away from the interfered cell exceeds t 1 (t 1 is a non-negative integer), the management device may set the additional interference control to on. The management device may perform a process for additional interference mitigation of the interfered cell. If the additional interference control state of the interfered cell is on, and the number of interfering source cells that are more than a threshold away from the interfered cell is less than t 2 (t 2 is a non-negative integer), the management device may set the additional interference control to off. The management device may perform a process for additional interference avoidance for the interfered cell. According to an embodiment of the present disclosure, t 2 can be set to be less than t 1 value to reduce repeated ping-pong switching of interfered cells.

[0198] In some embodiments of the present disclosure, if the additional interference control state of the interfered cell is off, and the amount of interference of the interfered cell that is farther away from the interference source cell than the threshold exceeds a third threshold, the management device may set the additional interference control state to on. The management device may perform a process for additional interference avoidance of the interfered cell. If the additional interference control state of the interfered cell is on, and the amount of interference of the interfered cell that is farther away from the interference source cell than the threshold is lower than a fourth threshold, the management device may set the additional interference control state to off. The management device may perform a process for additional interference avoidance of the interfered cell. According to an embodiment of the present disclosure, by taking into account the hysteresis characteristic, the fourth threshold may be set to a value less than the third threshold.

[0199] That is, the management device can more effectively manage the impact of atmospheric interference by performing additional interference control on cells with large cell distances among the interference source cells or the interfered cells. According to an embodiment of the present disclosure, aspects of interference control of the interference source cell can be configured as shown in Table 4.

[0200] Table 4

[0201]

[0202] If the interference control state is 0, interference control is not performed. For example, the interference control state of the interference source cell is off. If the interference control state is 1, interference control is performed. For example, the interference control state of the interference source cell is on. The management device may perform interference mitigation of the interference source cell. If the additional interference control state is 0, additional interference control is not performed. For example, the additional interference control state of the interference source cell is off. If the additional interference control state is 1, additional interference control is performed. For example, the additional interference control state of the interference source cell is on. The management device may perform additional interference mitigation of the interference source cell. Although the interference control for additional interference mitigation in Table 4 limits the scheduling of DL subframes or reduces the DL transmit power, it should be noted that other interference mitigation operations may be defined as additional interference mitigation. For example, interference mitigation may change the SSF configuration, and additional interference mitigation may change the antenna configuration. For example, interference mitigation may change the UL / DL configuration, and additional interference mitigation may limit the scheduling of DL subframes.

[0203] Although Fig.10 In the invention, two states are defined based on whether the cell distance exceeds (or is greater than) a single threshold, but two or more interference control states may be defined. For example, three interference control states may be defined, and the management device may identify the interference control state corresponding to the cell distance among the interference control states. Each interference control state may be a control state in which the interference source cell gradually reduces atmospheric interference, or a control state in which the interfered cell gradually avoids atmospheric interference. For example, if the cell distance is the first level, the management device may limit the scheduling of one UL symbol of the interfered cell. If the cell distance is the second level, the management device may limit the scheduling of two UL symbols of the interfered cell. If the cell distance is the N level, the management device may limit the scheduling of the N-ary UL symbols of the interfered cell. For example, if the cell distance is the first level, the management device may reduce the number of DL time slots by 1 in the DL-UL mode of the interference source cell. If the cell distance is the second level, the management device may reduce the number of DL time slots by two in the DL-UL mode of the interference source cell. If the cell distance is the N level, the management device may reduce the number of DL time slots by N in the DL-UL mode of the interference source cell.

[0204] Fig.10 The interference of the interference source cell is controlled, and if the distance exceeds a threshold, additional interference control is performed on the interference source cell, but the various embodiments of the present disclosure are not limited to this. In some embodiments of the present disclosure, if the cell distance is lower than a threshold, the management device may only perform interference mitigation of the interference source cell, and if the cell distance exceeds the threshold, both interference mitigation of the interference source cell and interference avoidance of the interfered cell may be performed. In some other embodiments of the present disclosure, if the cell distance is lower than a threshold, the management device may only perform interference avoidance of the interfered cell, and if the cell distance exceeds a threshold, both interference mitigation of the interference source cell and interference avoidance of the interfered cell may be performed.

[0205] Adaptive interference control according to various embodiments of the present disclosure can be performed based on the interference measurement results of the interfered cell. If the interference source cell and the interfered cell are determined and interference mitigation is performed, the effect of interference mitigation may not be reflected. Therefore, adaptive interference control can be performed by observing the interference measurement results of the interfered cell after interference mitigation, that is, after DL interference control. The management device can adjust the ratio of cells whose interference control state is on for the interference source cell. After determining the interference control and controlling the interference, each cell can measure the atmospheric interference. According to the interference measurement results, the ratio of cells used for additional interference mitigation (DL interference control) can be increased or decreased.

[0206] Adaptive interference according to various embodiments of the present disclosure may include three processes. In the first process, each cell may measure interference. The interference measurement result of each cell may be provided to a management device including an interference determination block. In addition to atmospheric interference, the measurement result may include UL channel quality information such as MCS or BLER.

[0207] The second process 403 may assign a priority to the interference source cell of each interfered cell. For example, the priority may be determined in descending order of the amount of interference on the interfered cell. For example, the priority may be determined in descending order of the amount of interference on all interfered cells. For example, the priority may be determined in descending order of the total number of interfered cells.

[0208] The third process 405 can adjust the cell ratio. If the interference measurement result of the interfered cell does not meet the reference value (i.e., if the atmospheric interference exceeds a specific threshold, or if the UL quality does not reach a specific reference value), the number or ratio of the DL interference control cells of the interfered cell may increase. On the contrary, the number or ratio of the DL interference control cells of the interfered cell may decrease. If the number or ratio of the cells changes, the order of the included interference source cells may conform to the priority of the second process. In this article, the rate of change of each interfered cell may be different.

[0209] The adaptive interference control of the present disclosure can be performed continuously. For example, these three processes can be repeated. Now, in Fig.11 The operation of each entity for adaptive interference control is explained in.

[0210] Fig.11 A flow chart of adaptive interference control in a wireless communication system according to an embodiment of the present disclosure is shown. Fig.11 Some of the operations may be performed by a management device (e.g., Figure 1 management device 130) is completed, and Fig.11 Some other operations in the operation may be performed by separate cells (for example, Figure 1 The management device may be a central unit connected to each cell.

[0211] refer to Fig.11 , operations 1101 and 1103 may be performed at a base station of each cell. Operations 1101 and 1103 may be referred to as interference measurement process 1151. In operation 1101, each cell may send and receive a sequence. The type of sequence and the resources of the sequence may be defined on a cell basis. Since the type of sequence and the resources of the sequence are cell-specific, other cells may identify the cell that sent the sequence.

[0212] Each cell may measure interference in operation 1103. A base station of the cell may measure a DL signal transmitted from another cell in a UL symbol region.

[0213] Operations 1105 to 1115 may be performed on a management device connected to each cell. The management device may manage adaptive interference control by collecting information from each cell. Operations 1105 to 1115 may be referred to as interference management process 1152. In operation 1105, the management device may determine an interference source cell and / or an interfered cell. The management device may identify at least one interference source cell among the interference measurement cells. The management device may identify at least one interfered cell among the interference measurement cells.

[0214] In operation 1107, the management device may determine a priority. Herein, a priority may be determined for each interfered cell. A priority may be defined for at least one interferer cell that affects the interfered cell. For example, a priority may be determined for each interferer cell in the interferer cell of the interfered cell.

[0215] In operation 1109, the management device may determine whether there is atmospheric disturbance. The management device may perform operation 1111 in response to the presence of atmospheric disturbance. The management device may perform operation 1113 in response to the absence of atmospheric disturbance.

[0216] In operation 1111, the management device may increase the number of interference source cells for interference management. For example, the management device may add a change increment (delta) d to the number of existing interference source cells and thus adjust the number of interference source cells A+d. Fig.11 Differently, the management device can reduce the ratio of interference source cells among the total cells, rather than the number of interference source cells. Since atmospheric interference still exists, the impact of atmospheric interference in the network can be mitigated by increasing the ratio of interference source cells used for interference mitigation.

[0217] In operation 1113, the management device may reduce the number of interference source cells used for interference management. For example, the management device may subtract the change increment d from the number of existing interference source cells, thereby adjusting the number Ad of interference source cells. Fig.11 Differently, the management device can reduce the ratio of interfering source cells among the total cells, rather than the number of interfering source cells. Due to the reduction of atmospheric interference, the efficiency in the network can be improved by increasing the ratio of interfering source cells used for interference mitigation.

[0218] In operation 1115, the management device may determine whether the interference control condition is satisfied. For example, the management device may determine whether the interference of the corresponding cell is controlled. For example, the management device may determine whether the interference source cell satisfies the interference mitigation condition. For example, the management device may determine whether the interfered cell satisfies the interference avoidance condition.

[0219] Operation 1117 may be performed in each cell. Operation 1117 may be referred to as interference management process 1153. The interference control of operation 1117 may be performed in each cell according to the control of the management device. In operation 1117, the base station of each cell may perform interference control. The base station of the interference source cell may perform DL interference control. For example, the base station of the interference source cell may perform interference mitigation. The base station of the interfered cell may perform UL interference control. For example, the base station of the interfered cell may perform interference avoidance.

[0220] After operation 1117, the management device may return to operation 1111. For example, each cell and the management device may periodically perform interference control operations. By repeating the interference control operations, the effect of interference control may be reflected, thereby maximizing the interference control effect in the network environment.

[0221] In addition to the LTE TDD communication system as described above, various embodiments of the present disclosure may also be equally applied to an NR communication system and an NR network.

[0222] In some embodiments of the present disclosure, interference control may consider changing the bandwidth part (BWP). In the 5G NR communication system, the bandwidth is increased, so the BWP in the entire bandwidth is operated instead of the entire bandwidth. Multiple (for example, four) BWPs may be defined in the entire bandwidth. Each UE may be allocated a PRB frequency band for transmission and reception in the BWP.

[0223] The management device can change the BWP to schedule the base station of the interfered cell to another frequency area in the frequency domain. The base station of the interfered cell can measure the atmospheric interference of each allocated BWP. In addition, the interference source cell or the interfered cell can be determined according to the BWP and each cell. If a specific BWP requires interference avoidance, interference can be avoided without switching by controlling the UE to receive signals on other BWPs other than the specific BWP. Similarly, the management device can change the BWP to schedule the base station of the interferer cell to another frequency area in the frequency domain. The management device can change the BWP used for interference mitigation of the interferer cell. The management device can determine the interference source cell or the interfered cell for each BWP. If a specific BWP requires interference mitigation, the interference of the interferer cell can be mitigated by controlling the UE to send signals on other BWPs other than the corresponding BWP.

[0224] In some embodiments of the present disclosure, the interference control method may consider adjusting the symbol area of ​​the time domain. In the NR communication system, a symbol area that is flexibly used for sending and receiving can be set according to time slots (or subframes). The interfered cell can set the symbol area not to use UL symbols with interference. According to an embodiment of the present disclosure, the base station of the interfered cell can adaptively reduce the UL symbol area by sending a DCI including a time slot format indicator to the terminal. As the UL symbol area decreases, interference can be avoided. In the same way, the interference source cell can set the symbol area to reduce the number of DL symbols that cause interference. The interference source cell of the base station can mitigate the impact of atmospheric interference by reducing the number of DL symbols carrying DL signals. In this case, the management device can send DL / UL allocation area information for each cell, or can use a signal to notify the information of the area where DL / UL allocation should be avoided.

[0225] In some embodiments of the present disclosure, the interference control method may change the subcarrier spacing (SCS) μ. In the NR communication system, the SCS may be changed adaptively. If the SCS changes, the absolute time length in a time slot may change. By increasing the DL SCS of the flexible time slot, rather than reducing the number of DL symbols of the interference source cell, the DL symbol duration may be reduced. In this way, a signal for adjusting the DL SCS may be sent to each cell.

[0226] The apparatus and method according to various embodiments of the present disclosure may effectively control interference between base stations by identifying interference relations based on measurement results.

[0227] The methods according to the embodiments described in the claims or specification of the present disclosure may be implemented by software, hardware, or a combination of hardware and software.

[0228] For software, a computer-readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium may be configured to be executed by one or more processors of an electronic device. One or more programs may include instructions for controlling an electronic device to perform a method according to an embodiment described in the claims or specification of the present disclosure.

[0229] Such a program (software module, software) may be stored in a random access memory, a non-volatile memory including flash memory, a read-only memory (ROM), an electrically erasable programmable ROM (EEPROM), a magnetic disk storage device, a compact disk (CD)-ROM, a digital versatile disk (DVD) or other optical storage device, and a magnetic tape. Alternatively, the program may be stored in a memory that incorporates part or all of those recording media. A plurality of memories may be provided.

[0230] The program may be stored in an attachable storage device accessible via a communication network (such as the Internet, an intranet, a local area network (LAN), a wide area network (WLAN), or a storage area network (SAN), or a communication network combining these networks). The storage device may access the electronic device through an external port. A separate storage device may access the device through a communication network.

[0231] While the invention has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.

Claims

1. A method performed by a user equipment UE in a wireless communication system, the method comprising: Obtaining a measurement result of each cell in a plurality of cells respectively configured with at least one bandwidth part BWP; Based on the measurement results, identifying an interference source cell and an interfered cell among the multiple cells through atmospheric interference; as well as performing interference control on a BWP configured to at least one of the interference source cell or the interfered cell, The measurement result includes interference information related to a downlink signal of at least one other cell measured in an uplink resource duration of the measuring cell and cell information of the at least one other cell, and The performing of interference control includes: A BWP configured for at least one cell is switched to another BWP configured for at least one cell.

2. The method according to claim 1, in, The performing interference control includes switching the spatial subframe configuration of the interference source cell from a first configuration to a second configuration, and The length of the downlink pilot time slot DwPTS of the second configuration is shorter than the length of the DwPTS of the first configuration.

3. The method according to claim 2, in, The performing interference control comprises: When the distance between the interference source cell and the interfered cell exceeds a threshold, reducing the scheduling area of ​​the downlink DL subframe of the interference source cell, and The scheduling area of ​​the DL subframe includes at least one of the number of symbols or the number of physical resource blocks (PRBs).

4. The method according to claim 1, in, The performing interference control comprises: The time division duplex TDD DL-uplink UL mode of the interference source cell is changed from a first mode to a second mode, and The number of DL symbols in the second mode is less than the number of DL symbols in the first mode.

5. The method according to claim 1, in, The performing interference control comprises: sending a control command to the base station of the interfered cell, and The control command controls the interfered cell to switch a terminal of the interfered cell to a target cell corresponding to another carrier frequency different from the carrier frequency of the interfered cell.

6. The method according to claim 1, in, The performing interference control comprises: sending a control command to the base station of the interfered cell, The control command controls the base station of the interfered cell to set an additional UL carrier to at least one terminal of the interfered cell, and The additional UL carrier is a supplementary uplink channel SUL associated with the interfered cell.

7. The method according to claim 1, in, The performing interference control comprises: sending a control command to a base station of the interfered cell to change the format of the flexible time slot from a first format to a second format, wherein the flexible time slot is included in a TDD DL-UL mode of the interfered cell, wherein the number of UL symbols in the second format is less than the number of UL symbols in the first format, and The control command is used by the interfered cell to send downlink control information DCI for changing the time slot format to at least one terminal.

8. The method according to claim 1, wherein: The performing interference control comprises: When the number of interfered cells corresponding to the interference source cell among the plurality of cells exceeds N1 (N1 is a natural number), performing interference control on the interference source cell; and When the number of interference source cells corresponding to the interfered cell among the plurality of cells exceeds N2 (N2 is a natural number), interference control is performed on the interfered cell.

9. The method according to claim 1, wherein: The performing interference control comprises: When the total amount of interference of the interfered cells caused by the interferer cell among the multiple cells exceeds a first threshold, performing interference control on the interferer cell; and When the total interference amount of the interference source cell to the interfered cell among the interfered cells exceeds a second threshold, interference control is performed on the interfered cell.

10. The method according to claim 1, wherein: The user equipment is located in a base station supporting at least one of the cells.

11. The method according to claim 9, wherein: The interference information includes interference cell information and interference amount information.

12. The method according to claim 9, further comprising calculating a total interference amount of a specific cell to other interference source cells based on the measurement result.

13. The method according to claim 9, wherein: The performing interference control comprises: Based on the total interference amount of the interference management cell to at least one other interference source cell, it is determined whether the interference control condition is met.

14. A user equipment UE in a wireless communication system, the UE comprising: Transceiver; and a controller operably coupled to the transceiver; Wherein, the controller is configured to implement one of the methods claimed in claims 1 to 13.

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