Base station, control method, and integrated circuit

Abstract

The present invention contributes to the provision of a base station capable of suppressing interference between base stations. The present invention is provided with: a control circuit that sets power-related information relating to transmission power of a measurement signal for inter-base-station interference measurement; and a transmission circuit that transmits control information including power-related information and a measurement signal to another base station. The power-related information may be information that indicates the transmission power or information that indicates the ratio between the transmission power and the transmission power of a prescribed signal. The control information may further include information about an antenna.

Description

Base station, control method, and integrated circuit

[0001] The present disclosure relates to a base station, a control method, and an integrated circuit.

[0002] The 3rd Generation Partnership Project (3GPP) has completed the physical layer specifications for Release 17 NR (New Radio access technology) as a functional extension of 5th Generation mobile communication systems (5G). NR supports functions that realize Ultra Reliable and Low Latency Communication (URLLC) in addition to high speed and large capacity, which are the basic requirements for enhanced Mobile Broadband (eMBB) (see, for example, Non-Patent Documents 1-7).

[0003] 3GPP TS 38.211 V18.2.0, "Physical channels and modulation (Release 18) ", Mar. 20243GPP TS 38.212 V18.2.0, "Multiplexing and channel coding (Release 18)", Mar. 20243GPP TS 38.213 V18.2.0, "Physical layer procedure for control (Release 18)", Mar. 20243GPP TS 38.214 V18.2.0, "Physical layer procedures for data (Release 18)", Mar. 20243GPP TS 38.215 V18.2.0, "Physical layer measurements (Release 18)", Mar. 20243GPP TS 38.331 V18.1.0, "Radio Resource Control (RRC) protocol specification (Release 18)", April 20243GPP TS 38.473 V18.1.0, "NG-RAN; F1 Application Protocol (F1AP)” (Release 18)", Mar. 2024

[0004] However, there is room for consideration regarding interference between base stations.

[0005] Non-limiting examples of the present disclosure contribute to providing a base station, a control method, and an integrated circuit that can suppress interference between base stations.

[0006] A base station according to one embodiment of the present disclosure includes a control circuit that sets power-related information regarding the transmission power of a measurement signal for measuring interference between base stations, and a transmission circuit that transmits control information including the power-related information and the measurement signal to other base stations.

[0007] Note that these general or specific aspects may be implemented in a system, apparatus, method, integrated circuit, computer program, or recording medium, or may be implemented in any combination of a system, apparatus, method, integrated circuit, computer program, and recording medium.

[0008] According to an embodiment of the present disclosure, it is possible to suppress interference between base stations.

[0009] Further advantages and effects in an embodiment of the present disclosure will be clarified from the specification and drawings. Such advantages and / or effects are provided by some embodiments and the features described in the specification and drawings, respectively, but not all of them are necessarily provided in order to obtain one or more identical features.

[0010] Figure showing an example of subband non-overlapping full duplex (SBFD) operation, Figure showing an example of resource allocation in SBFD operation, Figure for explaining inter-base station CLI, Figure for explaining beam nulling, Figure showing a method for measuring inter-base station CLI, Figure showing a method for measuring inter-base station CLI, Block diagram showing a partial configuration example of a base station, Block diagram showing a partial configuration example of a base station, Block diagram showing a partial configuration example of a base station, Sequence diagram showing the flow of CLI reduction processing executed by two gNBs, Figure showing the configuration regarding the measurement signal in Example 1-1, Figure showing the configuration regarding the measurement signal in Example 1-2, Figure showing the antenna configuration, Figure showing the antenna configuration, Figure showing the antenna configuration, Figure showing the configuration related to the measurement signal in Example 2-1, Sequence diagram showing the flow of processing when the UL reception performance significantly deteriorates, Diagram of an exemplary architecture of a 3GPP NR system, Diagram of an exemplary functional split in 5G O-RAN

[0011] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[0012] [Subband Non-Overlapping Full Duplex (SBFD) and Cross Link Interference (CLI) Reduction Processing] In Release 18 and Release 19, subband non-overlapping full duplex (SBFD) and cross link interference (CLI) reduction processing are discussed.

[0013] 1A is a diagram showing an example of the operation of a base station (also referred to as a gNB) and a terminal (also referred to as User Equipment (UE)) (e.g., UE #1 and UE #2) in the same cell in SBFD operation. In SBFD operation, the base station performs SBFD operation, and the terminal performs half-duplex operation.

[0014] Figure 1B shows an example of resource allocation in SBFD operation. In Figure 1B, the vertical axis represents frequency and the horizontal axis represents time. Also, in Figure 1B, "UL" represents uplink transmission and "DL" represents downlink transmission. Also, resources unused in each device (e.g., gNB, UE #1, and UE #2) are shown with dotted lines.

[0015] As shown in FIG. 1B , in SBFD, a frequency resource (frequency band) is divided into multiple subbands (also referred to as bands, RB sets, subbands, or sub-BWPs (Bandwidth Parts)), and transmission in different directions is supported on a subband-by-subband basis. As shown in FIG. 1B , a base station can simultaneously transmit and receive on the uplink and downlink (e.g., SBFD operation), and a terminal can transmit and receive on either the uplink or the downlink in a given time resource (e.g., half-duplex operation). For example, in the example of FIG. 1B , in the same time resource (e.g., slot or symbol), UE #1 communicates with the base station on the uplink, and UE #2 communicates with the base station on the downlink.

[0016] In SBFD operation, various types of interference occur. For example, there is CLI between terminals belonging to a base station operating in SBFD operation and CLI between base stations and neighboring base stations. CLI between terminals and base stations significantly degrades reception characteristics, so countermeasures are required.

[0017] 2 is a diagram for explaining inter-base station CLI. gNB1 is performing SBFD operation, and gNB1 is simultaneously receiving UL from UE #1 and transmitting DL to UE #2. gNB2 is performing TDD operation, and is transmitting DL to UE #3.

[0018] CLI between base stations is interference from gNB2 transmitting in the DL to gNB1 receiving in the UL. In this case, gNB1 receiving in the UL may receive CLI from gNB2 transmitting in the DL, which may degrade the UL reception characteristics. Hereinafter, the interfering base station (Aggressor gNB) will be referred to as A_gNB, and the interfered base station (Victim gNB) will be referred to as V_gNB. In Release 19, V_gNB will be discussed for SBFD operation, and A_gNB will be discussed for TDD or SBFD operation.

[0019] CLI between base stations can cause blocking in the receiver of the base station receiving the UL signal. In SBFD operation, if a wideband filter is used for UL reception, DL signals from adjacent base stations will enter the reception bandwidth of the UL receiver, causing a serious increase in noise level and saturation, leading to a significant degradation of UL reception performance.

[0020] Beam nulling has been proposed as a method for reducing CLI between base stations. Figure 3 is a diagram for explaining beam nulling. The A_gNB performs DL transmission to multiple terminals using TDD operation, and the V_gNB performs UL reception from multiple terminals using SBFD operation. Beam nulling obtains channel state information from the A_gNB to the V_gNB from inter-base station CLI measurements, and determines the weight of DL beamforming so as to direct a null beam to the V_gNB, taking into account the channel status information.

[0021] For example, when A_gNB determines the weight of DL beamforming for the terminals (UE #1 and UE #2 in the figure), it assigns weights so as to direct a null beam to the V_gNB. Because the null beam of A_gNB is directed toward the V_gNB, the total received power during UL reception at the V_gNB is reduced, making it possible to reduce blocking.

[0022] To perform beam nulling, it is necessary to measure channel status information from the A_gNB to the V_gNB (i.e., inter-base station CLI measurement is required). The procedure for inter-base station CLI measurement is explained below. Release 19 proposes a procedure for inter-base station CLI measurement in two beam nulling scenarios.

[0023] 4A and 4B are diagrams showing an example of an inter-base station CLI measurement procedure. There are two options for the measurement procedure example. FIG. 4A is a sequence diagram showing option 1. FIG. 4B is a sequence diagram showing option 2. Option 1 is a method in which the V_gNB side measures channel status information, and option 2 is a method in which the A_gNB side measures channel status information.

[0024] In Figure 4A, the A_gNB transmits a resource (e.g., NZP CSI-RS (Non Zero Power Channel State Information reference signal)) signal for measuring inter-base station CLI (step S101). The V_gNB receives a measurement signal for measuring inter-base station interference transmitted from the A_gNB and measures channel state information (step S102). Here, the V_gNB shares the configuration (e.g., time / frequency information, etc.) of the measurement signal (e.g., NZP CSI-RS, etc.) from the A_gNB via the Xn / F1 interface, so the V_gNB can receive and measure the measurement signal based on the shared configuration.

[0025] The time / frequency information includes information indicating the timing and time period of the measurement signal transmission, as well as information indicating the frequency band the measurement signal is transmitted in. The channel condition information also includes information indicating the degree of interference in decibels (dB), with the higher this value, the greater the degree of interference.

[0026] The V_gNB transmits the measured channel status information and a CLI reduction request to the A_gNB via the Xn / F1 interface (step S103). The A_gNB performs beam nulling to reduce inter-base station CLI based on the received channel status information (step S104).

[0027] The CLI reduction request will now be described. The V_gNB can trigger the execution of the CLI reduction process to the A_gNB with a CLI reduction request. The CLI reduction request is transmitted to another base station via the Xn / F1 interface. For example, if the UL reception performance of the V_gNB significantly deteriorates, the V_gNB transmits a CLI reduction request to the A_gNB. Upon receiving the CLI reduction request, the A_gNB may execute the CLI reduction process. For example, the A_gNB does not necessarily execute the CLI reduction process in order not to restrict scheduling.

[0028] Next, Option 2 will be described. In Fig. 4B, the V_gNB transmits a resource signal (e.g., NZP CSI-RS) for measuring inter-base station CLI (step S201). The A_gNB receives a measurement signal for measuring inter-base station interference transmitted from the V_gNB and measures channel state information assuming channel reciprocity between the A_gNB and the V_gNB (step S202). Here, the A_gNB is shared with the V_gNB the configuration (e.g., time / frequency information) of the measurement signal (e.g., NZP CSI-RS) via the Xn / F1 interface, and therefore the A_gNB can receive and measure the measurement signal based on the shared configuration.

[0029] The V_gNB transmits a CLI reduction request to the A_gNB via the Xn / F1 interface (step S203). The A_gNB performs beam nulling to reduce inter-base station CLI based on the measured channel condition information (step S204).

[0030] Compared to Option 2, Option 1 requires channel condition information to be transmitted from the V_gNB to the A_gNB, resulting in a greater information exchange overhead.

[0031] Furthermore, in the A_gNB side measurement in Option 2, if the V_gNB and the A_gNB transmit measurement signals with different transmission powers, the A_gNB does not know the transmission power of the V_gNB, and therefore the A_gNB cannot accurately measure the impact from the A_gNB to the V_gNB. For example, if the transmission power of the V_gNB is significantly smaller than the transmission power of the A_gNB, even if the CLI from the A_gNB to the V_gNB is large, the CLI measurement result at the A_gNB may be determined to be a small CLI. As a result, the A_gNB may not perform beam nulling.

[0032] In a non-limiting example of the present disclosure, a configuration example will be described in which power-related information regarding the transmission power of a measurement signal for measuring inter-base station CLI is transmitted to other base stations.

[0033] FIG. 5A is a block diagram showing a partial configuration example of a base station 100 according to one embodiment of the present disclosure. In the base station 100 shown in FIG. 5A, a control unit (e.g., corresponding to a control circuit) sets power-related information related to the transmission power of a measurement signal for measuring interference between base stations. A transmitter (e.g., corresponding to a transmission circuit) transmits control information including the power-related information and the measurement signal to another base station. FIG. 5B is a block diagram showing a partial configuration example of a base station 200 according to one embodiment of the present disclosure. In the base station 200 shown in FIG. 5B, a receiver (e.g., corresponding to a reception circuit) receives control information including power-related information related to the transmission power of a measurement signal for measuring interference between base stations and the measurement signal. A controller (e.g., corresponding to a control circuit) controls the interference between base stations using the control information and the measurement signal.

[0034] [Configuration of Base Station] Fig. 6 is a block diagram showing an example configuration of a base station 100, 200 according to one embodiment of the present disclosure. In Fig. 6, the base station 100, 200 includes a receiving unit 101, a demodulating / decoding unit 102, a CLI measuring unit 103, a scheduling unit 104, a control information holding unit 105, a data / control information generating unit 106, a coding / modulating unit 107, a transmitting unit 108, a CLI measurement information setting unit 109, and an inter-base station communication IF 110.

[0035] For example, at least one of the demodulation / decoding unit 102, the CLI measurement unit 103, the scheduling unit 104, the control information storage unit 105, the data / control information generation unit 106, the coding / modulation unit 107, and the CLI measurement information setting unit 109 may be included in the control unit shown in Figure 5, the base station inter-communication IF 110 and the transmission unit 108 may be included in the transmission unit shown in Figure 5A, and the base station inter-communication IF 110 and the reception unit 101 may be included in the reception unit shown in Figure 5B.

[0036] The receiving unit 101 performs reception processing such as downconvert or A / D conversion on a signal received via an antenna, and outputs the processed received signal to the demodulation and decoding unit 102 .

[0037] The demodulation and decoding unit 102 demodulates and decodes the received signal input from the receiving unit 101, and outputs the decoded result to the scheduling unit 104. Furthermore, if the received signal includes a measurement signal for measuring inter-base station CLI, the demodulation and decoding unit 102 outputs the measurement signal to the CLI measurement unit 103.

[0038] The control information holding unit 105 holds a configuration indicating time / frequency information and power-related information of measurement signals transmitted by the base station itself. Details of the configuration will be described later. As will be described later, the control information holding unit 105 can also hold antenna configurations. The control information holding unit 105 also holds configurations indicating time / frequency information and power-related information of measurement signals transmitted by other base stations. The control information holding unit 105 can also hold antenna configurations of other base stations. In the following description, information indicated in the configuration related to the base station itself will be referred to as "base station itself setting information," and information indicated in the configuration related to other base stations will be referred to as "other base station setting information."

[0039] The control information holding unit 105 also holds scheduling control information for scheduling transmission and reception, etc. The control information holding unit 105 outputs the various types of information it holds to each component (for example, the scheduling unit 104 and the CLI measurement unit 103) as necessary.

[0040] Other base station setting information corresponding to the base station to be measured is input to the CLI measurement section 103 from the control information holding section 105. Based on the other base station setting information, the CLI measurement section 103 extracts a resource signal for CLI measurement from the measurement signal input from the demodulation and decoding section 102. The CLI measurement section 103 measures the inter-base station CLI from the extracted resource signal for CLI measurement, and outputs an inter-base station CLI measurement value to the scheduling section 104. The inter-base station CLI measurement value is an example of channel state information.

[0041] The scheduling section 104 outputs other base station setting information corresponding to the base station to be measured, which is input from the CLI measurement information setting section 109, to the control information holding section 105. Furthermore, based on the inter-base station CLI measurement value input from the CLI measurement section 103 and the scheduling control information input from the control information holding section 105, the scheduling section 104 performs scheduling of transmission and reception of each terminal (for example, determining beam weights taking into account the inter-base station CLI measurement value), and instructs the data and control information generating section 106 to generate data and control information.

[0042] The scheduling unit 104 instructs the data and control information generating unit 106 to transmit a measurement signal based on the base station configuration information input from the control information holding unit 105. The scheduling unit 104 also outputs the base station configuration information to the CLI measurement information setting unit 109.

[0043] The CLI measurement information setting unit 109 receives other base station setting information from other base stations via the inter-base station communication IF 110 and outputs the information to the scheduling unit 104. The CLI measurement information setting unit 109 also transmits the own base station setting information input from the scheduling unit 104 to other base stations via the inter-base station communication IF 110. As described above, the own base station setting information includes power-related information, and therefore, the power-related information can be shared with other base stations. The inter-base station communication IF 110 is an interface (e.g., Xn or F1) that performs communication between the base station and other base stations.

[0044] The data and control information generating unit 106 generates data to be transmitted and transmission-related control information related to transmission, for example, in accordance with instructions from the scheduling unit 104, and outputs a signal including the generated data and transmission-related control information to the coding and modulation unit 107. The generated data may include signaling information of higher layers.

[0045] The coding and modulation unit 107 codes and modulates, for example, the data and transmission-related control information input from the data and control information generation unit 106, and outputs the coded and modulated data to the transmission unit 108. The transmission unit 108 performs transmission processing such as D / A conversion, up-conversion, or amplification on the signal input from the coding and modulation unit 107, and transmits the radio signal obtained by the transmission processing from an antenna to the terminal.

[0046] In this embodiment, with the above configuration, power-related information regarding the transmission power of the measurement signal is transmitted to other base stations, thereby executing a sharing process for sharing power-related information between base stations, and executing a CLI reduction process for reducing inter-base station CLI.

[0047] The flow of this sharing process will be explained. Fig. 7 is a sequence diagram showing the flow of the sharing process executed by two gNBs (gNB_X and gNB_Y). In Fig. 7, gNB_Y configures resources for inter-base station CLI measurement (step S301). This configuration content includes at least power-related information regarding the transmission power of the measurement signal transmitted by its own base station, and is stored in the control information storage unit 105 as a configuration related to the measurement signal.

[0048] The gNB_Y transmits measurement-related information including its own base station setting information to the gNB_X via the inter-base station communication IF110 (step S302). The measurement-related information is an example of control information. Next, the gNB_Y transmits a measurement signal to the gNB_X (step S303).

[0049] The gNB_X measures channel status information based on its own base station setting information (other base station setting information from the perspective of the gNB_X) included in the measurement-related information received in step S302 (step S304). The gNB_Y also transmits a CLI reduction request to the gNB_X (step S305). The gNB_X performs beam nulling to reduce inter-base station CLI based on the measured channel status information and the CLI reduction request (step S306).

[0050] In this embodiment, there are roughly three examples of the base station setting information included in the measurement-related information transmitted in step S302. The three examples will be described in order below. Note that the following examples will be described using the above-mentioned base stations A_gNB and V_gNB. Also, with regard to the correspondence between gNB_X and gNB_Y in FIG. 7, A_gNB corresponds to gNB_X, and V_gNB corresponds to gNB_Y.

[0051] (Example 1) Example 1 is an example in which the host base station setting information includes power-related information related to the transmission power of a measurement signal. The power-related information is information indicating the transmission power, or information indicating the ratio between the transmission power and the transmission power of a predetermined signal. First, an example in which the power-related information is information indicating the transmission power (hereinafter referred to as "Example 1-1") will be described, and then an example in which the power-related information is information indicating the ratio between the transmission power and the transmission power of a predetermined signal (hereinafter referred to as "Example 1-2") will be described.

[0052] (Example 1-1) Fig. 8 is a diagram showing a configuration 300 related to measurement signals in Example 1-1. The NZP-CSI-RS-Configuration shown in the configuration 300 defines a configuration related to the NZP CSI-RS for measuring inter-base station CLI. This configuration defines time-frequency information of the NZP CSI-RS (e.g., nzp-CSI-RS-resourceMapping and nzp-CSI-RS-periodicity) and power-related information related to transmission power (e.g., nzp-CSI-RS-EPRE). This "nzp-CSI-RS-EPRE" is a parameter indicating the amount of energy in each resource element (RE), and therefore the transmission power can be determined from the power allocated to each resource element.

[0053] By including the information shown in this configuration 300 in the base station setting information, the A_gNB shares configurations related to the time and frequency of measurement signals (e.g., nzp-CSI-RS-resourceMapping and nzp-CSI-RS-periodicity) from the V_gNB. The A_gNB can know information indicating the transmission timing and transmission time zone of the measurement signals, and information indicating the frequency band in which the measurement signals are transmitted, and therefore can receive measurement signals from the V_gNB and measure channel state information.

[0054] By sharing power-related information (e.g., nzp-CSI-RS-EPRE) from the V_gNB, the A_gNB can accurately determine whether the inter-base station CLI measurement value is large from the measurement result and the transmission power of the shared measurement signal. For example, if the transmission power of the measurement signal shared from the V_gNB is significantly smaller than the transmission power of the A_gNB, it can be determined that the inter-base station CLI from the A_gNB to the V_gNB may be large even if the inter-base station CLI measurement value measured at the A_gNB is also small. As a result, the A_gNB can also perform a CLI reduction process.

[0055] (Example 1-2) Next, an example will be described in which the power-related information is information indicating the ratio between the transmission power and the transmission power of a predetermined signal. In this example, a signal that transmits an SSB (Synchronization Signal Block) is used as an example of the predetermined signal. Therefore, in this example, the ratio between the transmission power of the measurement signal and the transmission power of the signal that transmits the SSB (hereinafter also referred to as "SSB transmission power") is included in the base station setting information.

[0056] The SSB transmission power can be shared under existing specifications, so the transmission power of the measurement signal can be calculated from the ratio between the SSB transmission power and the transmission power of the measurement signal.

[0057] 9 is a diagram showing a configuration 310 related to measurement signals in Example 1-2. In FIG. 9, NZP-CSI-RS-Configuration defines a configuration related to the NZP CSI-RS for measuring inter-base station CLI. This configuration defines a parameter related to the transmission power ratio of signals transmitting the NZP CSI-RS and SSB (for example, nzp-CSI-RS-EPRE-ratio: the ratio of NZP CSI-RS EPRE to SSB EPRE).

[0058] SSB-TF-Configuration is a configuration related to SSB, and the SSB transmission power is set in sSB-Transmit-power. In the case of EPRE, the SSB EPRE can be calculated from sSB-Transmit-power, and the NZP CSI-RS EPRE can be calculated from the nzp-CSI-RS-EPRE-ratio and the SSB EPRE.

[0059] In the embodiment 1-2, the power-related information is only information indicating the ratio between the transmission power and the transmission power of a predetermined signal, so that it is possible to reduce the overhead of sharing for measuring CLI between base stations.

[0060] (Example 2) Example 2 is an example in which, in addition to power-related information, information related to antennas is included in the host base station setting information and these are shared. In Example 2, an example in which the transmission power of measurement signals and the antenna configuration are shared (hereinafter referred to as "Example 2-1") and an example in which the transmission power of measurement signals and the antenna configuration for each component carrier are shared (hereinafter referred to as "Example 2-2") will be described.

[0061] Before describing each embodiment, we will explain the antenna configuration of a base station that performs SBFD operation. Although the antenna configuration for SBFD depends on the implementation of the base station, several SBFD antenna configurations were discussed in Release 19.

[0062] Figures 10A, 10B, and 10C show antenna configurations for SBFD operation and TDD operation. In Figures 10A, 10B, and 10C, the white background in the top row indicates the total number of antenna elements in the antenna array. For both SBFD and TDD, the area with a diagonal line slanting upwards to the right indicates the number of antenna elements used in DL, and the area with a diagonal line slanting downwards to the right indicates the number of antenna elements used in UL.

[0063] In the antenna configuration shown in Figure 10A, the total number of antenna elements for SBFD and TDD is the same, N. The number of antenna elements used in DL for TDD is N, and the number of antenna elements used in UL is also N, and the antenna elements are used by switching between DL and UL over time. On the other hand, the number of antenna elements used in DL for SBFD is N / 2, and the number of antenna elements used in UL is the remaining N / 2.

[0064] In the antenna configuration shown in Figure 10B, the total number of antenna elements for SBFD is twice the total number of antenna elements for TDD (2N for SBFD, N for TDD). The number of antenna elements used in DL for TDD is N, and the number of antenna elements used in UL is also N, and the antenna elements are used by switching between DL and UL over time. On the other hand, the number of antenna elements used in DL for SBFD is N, and the remaining N antenna elements are used in UL.

[0065] In the antenna configuration shown in Figure 10C, the total number of antenna elements for SBFD is N, the same as for TDD. The number of antenna elements used in DL for TDD is N / 2, and the number of antenna elements used in UL is the remaining N / 2. The number of antenna elements used in DL for SBFD is N / 2, and the number of antenna elements used in UL is the remaining N / 2.

[0066] In the measurement procedure on the A_gNB side, a measurement signal is transmitted from the V_gNB, which is an SBFD operation. Therefore, for the A_gNB, knowing what kind of SBFD antenna configuration the V_gNB has is useful information for measuring and reducing CLI between base stations. Based on the above, we will start with an explanation of Example 2-1.

[0067] (Example 2-1) In Example 2-1, the V_gNB transmits its own base station setting information including information indicating the antenna configuration to the A_gNB, thereby sharing the antenna configuration. The antenna configuration transmitted at this time includes the following: Information indicating the antenna gain SBFD antenna configuration (information indicating whether the transmit beam and receive beam have the same antenna configuration in SBFD and TDD) Information indicating whether the number of transmit antenna elements, the number of receive antenna elements, and the transceiver unit (TxRU) are the same Information indicating whether different associated IDs are assigned in SBFD and TDD Information indicating whether the associated ID can be used in SBFD Note that the associated ID indicates whether the base stations have the same configuration, and the associated ID makes it possible to determine whether the same beam is being used.

[0068] Fig. 11 is a diagram showing a configuration 320 related to measurement signals in Example 2-1. In Fig. 11, NZP-CSI-RS-Configuration defines a configuration related to the NZP CSI-RS for measuring inter-base station CLI. This configuration defines parameters related to the transmission power ratio of the NZP CSI-RS (e.g., nzp-CSI-RS-EPRE-ratio). Furthermore, SBFD-Antenna-Configuration defines the SBFD antenna configuration. rxBeamSBFDAndNonSBFD and txBeamSBFDAndNonSBFD are information indicating whether the reception beam and transmission beam are the same for SBFD and TDD.

[0069] In addition to power-related information, the A_gNB also shares antenna configuration information with the V_gNB. For example, if antenna gain is additionally shared, the A_gNB can also learn the antenna directivity of the V_gNB, making it possible to measure base station CLI taking into account not only transmission power but also antenna directivity.

[0070] For example, if the V_gNB's transmission power is large but the antenna gain is small (e.g., an omnidirectional antenna), it can be seen that the inter-base station CLI measurement value measured by the A_gNB may be underestimated due to the antenna gain.

[0071] Furthermore, if the SBFD antenna configuration is additionally shared, the A_gNB's measurement flexibility is improved. Specifically, for example, if the same transmit or receive beam is used in SBFD and TDD, the A_gNB can determine whether the V_gNB uses the same transmit / receive beam in SBFD and TDD by sharing the SBFD antenna configuration. Therefore, the A_gNB can measure measurement signals transmitted when the V_gNB is in SBFD and TDD operation. Therefore, the A_gNB's measurement flexibility is improved.

[0072] If it is not known whether the same transmitting or receiving beam is used for SBFD and TDD, the A_gNB needs to measure the impact of CLI when the V_gNB is in SBFD operation, and therefore the A_gNB can only measure using the measurement signal transmitted when the V_gNB is in SBFD operation.

[0073] In FIG. 11, the transmission power is transmitted using information indicating the ratio, but it may also be transmitted using "nzp-CSI-RS-EPRE" as shown in FIG.

[0074] (Example 2-2) In Example 2-2, time / frequency information, power-related information, and antenna configuration of a measurement signal (e.g., NZP CSI-RS) for measuring inter-base station CLI for each component carrier are shared by being transmitted from the V_gNB to the A_gNB. For example, the power-related information is shared for each component carrier.

[0075] Since the A_gNB can know the time / frequency information, power-related information, and antenna configuration of the measurement signal (e.g., NZP CSI-RS) for measuring the inter-base station CLI of the V_gNB for each component carrier, it can perform accurate inter-base station CLI measurement and CLI reduction processing for each component carrier. Note that the unit for sharing the power-related information is not limited to the unit of the component carrier, and may be another unit.

[0076] (Example 3) In Example 3, in addition to time / frequency information and power-related information of a measurement signal (e.g., NZP CSI-RS) for measuring CLI between base stations, information related to time is also transmitted from the V_gNB to the A_gNB, thereby sharing the information. For example, the V_gNB sets recommended / non-recommended for each slot (e.g., using one bit, where 1 indicates a recommended slot and 0 indicates a non-recommended slot). A recommended slot means that execution of a CLI reduction process is recommended, and a non-recommended slot means that execution of a CLI reduction process does not have to be performed.

[0077] By sharing recommended and non-recommended slots with the V_gNB, the A_gNB can know in advance the time at which it wants CLI reduction processing to be performed. For example, when the V_gNB performs important communication (e.g., URLLC (ultra-reliable and low-latency wireless communication)) in the UL subband of a specific slot interval during SBFD operation, it sets that slot interval as a recommended slot and shares it with the A_gNB. Based on the inter-base station CLI measurement results and the recommended and non-recommended slots, the A_gNB can perform CLI reduction processing in that interval, thereby protecting the UL communication of the V_gNB. Note that recommended / non-recommended slots are not limited to being set per slot (time domain resource) but may also be set per frequency domain resource.

[0078] [Relationship between A_gNB and V_gNB] The relationship between A_gNB and V_gNB used in the above-mentioned embodiment will be described. In the relationship between A_gNB and V_gNB, the Aggressor and Victim may be reversed, or one base station may be both an Aggressor and a Victim. Therefore, not only is power-related information transmitted from the V_gNB to the A_gNB, but power-related information may also be transmitted from the A_gNB to the V_gNB.

[0079] For example, if gNB_X is A_gNB and gNB_Y is V_gNB, the base station setting information is transmitted from gNB_Y to gNB_X. On the other hand, it is also possible that gNB_X is V_gNB and gNB_Y is A_gNB, in which case the base station setting information is transmitted from gNB_X to gNB_Y. Therefore, gNB_X and gNB_Y exchange base station setting information.

[0080] [Criteria for base station to perform CLI reduction processing] As described above, for example, even if A_gNB receives a CLI reduction request, it does not necessarily perform CLI reduction processing such as beam nulling. Therefore, an example of criteria for base station to perform CLI reduction processing will be described. The following (1) to (3) are considered as examples of criteria for whether or not a base station performs CLI reduction processing.

[0081] (1) Criteria using inter-base station CLI measurement results: For example, if the A_gNB finds that the degree of interference is high from the inter-base station CLI measurement results (for example, the result exceeds a threshold as a result of determination using a threshold, etc.), it executes CLI reduction processing. At this time, even if a CLI reduction request is not sent, the A_gNB can execute CLI reduction processing. (2) CLI reduction request reception criteria: For example, if the UL reception performance of the V_gNB is significantly degraded, the V_gNB sends a CLI reduction request to the A_gNB. The A_gNB executes CLI reduction processing upon receiving a CLI reduction request. (3) Criteria other than the above: In principle, the A_gNB executes CLI reduction processing upon receiving a CLI reduction request, but in exceptional cases, if executing CLI reduction processing would restrict the A_gNB's scheduling (for example, DL communication), the A_gNB does not execute CLI reduction processing.

[0082] Figure 12 is a sequence diagram showing the flow of the process (2) above. The sequence diagram shown in Figure 12 is a sequence diagram in which the UE communicating with the gNB_Y and the gNB_Y's judgment process have been added to the sequence diagram described in Figure 7. The content described in Figure 7 will be omitted. In Figure 12, after transmitting a measurement signal, the gNB_Y judges whether the UL reception performance from the UE has deteriorated (step S307). The judgment in this step S307 may be made based on, for example, a predetermined threshold value.

[0083] If the reception performance has deteriorated (step S307: YES), the gNB_Y transmits a CLI reduction request to the gNB_X (step S305), and the gNB_X performs beam nulling (step S306). On the other hand, if the reception performance has not deteriorated (step S307: NO), the gNB_Y does not transmit a CLI reduction request.

[0084] (Supplementary Note) Information indicating whether the terminal supports the functions, operations, or processes described in each of the above-described embodiments and each supplementary note may be transmitted (or notified) from the terminal to the base station 100, for example, as capability information or capability parameters of the terminal.

[0085] The capability information may include an information element (IE) that individually indicates whether the terminal supports at least one of the functions, operations, or processes described in the above-described embodiments, modifications, and supplements. Alternatively, the capability information may include an information element that indicates whether the terminal supports a combination of any two or more of the functions, operations, or processes described in the above-described embodiments, modifications, and supplements.

[0086] For example, the base station 100 may determine (or decide or assume) functions, operations, or processes that the terminal that transmitted the capability information supports (or does not support) based on the capability information received from the terminal. The base station 100 may perform operations, processes, or controls according to the determination result based on the capability information. For example, the base station 100 may control processes related to SBFD operation based on the capability information received from the terminal.

[0087] Note that the fact that a terminal does not support some of the functions, operations, or processes described in the above-described embodiments, modifications, and supplementary notes may be interpreted as meaning that such some of the functions, operations, or processes are restricted in the terminal. For example, information or a request regarding such restrictions may be notified to the base station 100.

[0088] Information regarding the capabilities or limitations of the terminal may, for example, be defined in a standard, or may be implicitly notified to the base station 100 in association with information known at the base station 100 or information transmitted to the base station 100.

[0089] (Control Signal) In the present disclosure, a downlink control signal (or downlink control information) related to an embodiment of the present disclosure may be, for example, a signal (or information) transmitted in a Physical Downlink Control Channel (PDCCH) of a physical layer, or a signal (or information) transmitted in a Medium Access Control Control Element (MAC CE) or Radio Resource Control (RRC) of a higher layer. Furthermore, the signal (or information) is not limited to being notified by a downlink control signal, but may be predefined in a specification (or standard) or preconfigured in a base station and a terminal.

[0090] In the present disclosure, an uplink control signal (or uplink control information) related to an embodiment of the present disclosure may be, for example, a signal (or information) transmitted in a PUCCH of a physical layer, or a signal (or information) transmitted in a MAC CE or RRC of a higher layer. Furthermore, the signal (or information) is not limited to being notified by an uplink control signal, but may be predefined in a specification (or standard) or preconfigured in a base station and a terminal. Furthermore, the uplink control signal may be replaced with, for example, uplink control information (UCI), 1st stage sidelink control information (SCI), or 2nd stage SCI.

[0091] (Base Station) In one embodiment of the present disclosure, the base station may be a Transmission Reception Point (TRP), a cluster head, an access point, a Remote Radio Head (RRH), an eNodeB (eNB), a gNodeB (gNB), a Base Station (BS), a Base Transceiver Station (BTS), a parent device, a gateway, or the like. In sidelink communication, a terminal may play the role of a base station. Instead of a base station, a relay device that relays communication between an upper node and a terminal may be used. Alternatively, a roadside unit may be used.

[0092] (Uplink / Downlink / Sidelink) An embodiment of the present disclosure may be applied to, for example, any of the uplink, downlink, and sidelink. For example, an embodiment of the present disclosure may be applied to a Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), or a Physical Random Access Channel (PRACH) in the uplink, a Physical Downlink Shared Channel (PDSCH), a PDCCH, or a Physical Broadcast Channel (PBCH) in the downlink, or a Physical Sidelink Shared Channel (PSSCH), a Physical Sidelink Control Channel (PSCCH), or a Physical Sidelink Broadcast Channel (PSBCH) in the sidelink.

[0093] The PDCCH, PDSCH, PUSCH, and PUCCH are examples of a downlink control channel, a downlink data channel, an uplink data channel, and an uplink control channel, respectively. The PSCCH and PSSCH are examples of a sidelink control channel and a sidelink data channel. The PBCH and PSBCH are examples of a broadcast channel, and the PRACH is an example of a random access channel.

[0094] (Data Channel / Control Channel) An embodiment of the present disclosure may be applied to, for example, either a data channel or a control channel. For example, the channel in an embodiment of the present disclosure may be replaced with any of the data channels PDSCH, PUSCH, and PSSCH, or the control channels PDCCH, PUCCH, PBCH, PSCCH, and PSBCH.

[0095] (Reference Signal) In one embodiment of the present disclosure, a reference signal is, for example, a signal known by both a base station and a mobile station, and may also be called a Reference Signal (RS) or a pilot signal. The reference signal may be any of a Demodulation Reference Signal (DMRS), a Channel State Information - Reference Signal (CSI-RS), a Tracking Reference Signal (TRS), a Phase Tracking Reference Signal (PTRS), a Cell-specific Reference Signal (CRS), or a Sounding Reference Signal (SRS).

[0096] (Time Interval) In one embodiment of the present disclosure, the unit of time resource is not limited to one or a combination of slots and symbols, but may be, for example, a time resource unit such as a frame, a superframe, a subframe, a slot, a time slot, a subslot, a minislot, a symbol, an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier-Frequency Division Multiplexing Access (SC-FDMA) symbol, or another time resource unit. Furthermore, the number of symbols included in one slot is not limited to the number of symbols exemplified in the above-mentioned embodiment, and may be another number of symbols.

[0097] (Frequency Band) An embodiment of the present disclosure may be applied to either a licensed band or an unlicensed band.

[0098] (Communication) An embodiment of the present disclosure may be applied to communication between a base station and a terminal (Uu link communication), communication between terminals (Sidelink communication), or Vehicle to Everything (V2X) communication. For example, the channel in an embodiment of the present disclosure may be replaced with any of PSCCH, PSSCH, Physical Sidelink Feedback Channel (PSFCH), PSBCH, PDCCH, PUCCH, PDSCH, PUSCH, or PBCH.

[0099] An embodiment of the present disclosure may be applied to a terrestrial network, a non-terrestrial network (NTN) using a satellite or a high altitude pseudo satellite (HAPS), or a terrestrial network in which transmission delay is large compared to the symbol length or slot length, such as a network with a large cell size or an ultra-wideband transmission network.

[0100] (SBFD) In ​​one embodiment of the present disclosure, operations on uplink, downlink, and sidelink symbols may be applied to symbols (e.g., SBFD symbols) on which SBFD (Subband Non-Overlapping Full Duplex, Subband Full Duplex) operations or controls are performed. In SBFD symbols, a frequency domain (or frequency resource, frequency band) is divided into multiple frequency domains (e.g., subbands, RB sets, subbands, or sub-BWPs (Bandwidth Parts)). A terminal transmits and receives in different directions (e.g., downlink or uplink) in units of subbands, which are the divided domains. In SBFD symbols, a terminal may transmit and receive in one direction, either uplink or downlink, but not in the other direction. On the other hand, a base station may be capable of transmitting and receiving on both the uplink and downlink simultaneously. SBFD symbols may have a smaller frequency domain available for downlink use than symbols that transmit and receive only downlink use. Also, SBFD symbols may have a smaller frequency domain available for uplink use than symbols that transmit and receive only uplink use.

[0101] In addition, in the SBFD symbol, a terminal may transmit and receive uplink and downlink simultaneously. In this case, the frequency domain in which the terminal transmits and the frequency domain in which the terminal receives may not be adjacent, but may be separated by a frequency interval (also called a frequency gap).

[0102] In addition, different transmission and reception directions in subband units, which are divided areas, may include transmission and reception of side links.

[0103] (XDD: Cross Division Duplex) In one embodiment of the present disclosure, the operation for uplink, downlink, and sidelink symbols may be applied to symbols (e.g., full duplex symbols) where full duplex operation or control is performed. In a full duplex symbol, both the terminal and the base station can simultaneously transmit and receive on the uplink and downlink. In a full duplex symbol, the terminal and the base station may simultaneously transmit and receive in an available frequency region (or frequency resource, frequency band), or may simultaneously transmit and receive in a partial frequency region (i.e., transmission or reception may be performed in other frequency regions). In this case, the frequency region in which the base station or terminal transmits and receives may not be adjacent, but may have a frequency interval (also called a frequency gap). Furthermore, for the purpose of, for example, reducing interference, either the terminal or the base station may simultaneously transmit and receive (i.e., the other may transmit or receive).

[0104] In addition, full duplex operation may be applied to an operation in which a terminal can simultaneously transmit and receive sidelinks, or to an operation in which a terminal can simultaneously transmit and receive sidelinks and uplinks or downlinks.

[0105] (Antenna Port) In one embodiment of the present disclosure, an antenna port refers to a logical antenna (antenna group) consisting of one or more physical antennas. For example, an antenna port does not necessarily refer to a single physical antenna, but may refer to an array antenna consisting of multiple antennas. For example, the number of physical antennas that an antenna port is composed of is not specified, and the antenna port may be specified as the smallest unit by which a terminal station can transmit a reference signal. Furthermore, an antenna port may also be specified as the smallest unit by which a weighting of a precoding vector is multiplied.

[0106] <5G NR System Architecture and Protocol Stack> The 5G NR system architecture generally assumes an NG-RAN (Next Generation - Radio Access Network) including gNBs. The gNBs provide UE-side termination of the NG radio access user plane (SDAP / PDCP / RLC / MAC / PHY) and control plane (RRC) protocols. The gNBs are connected to each other via an Xn interface. The gNBs are also connected to the Next Generation Core (NGC) via a Next Generation (NG) interface, more specifically to the Access and Mobility Management Function (AMF) (e.g., a specific core entity that performs AMF) via an NG-C interface, and to the User Plane Function (UPF) (e.g., a specific core entity that performs UPF) via an NG-U interface. The NG-RAN architecture is shown in Figure 13 (see, for example, 3GPP TS 38.300 v15.6.0, section 4).

[0107] <RRC connection setup and reconfiguration procedure> This shows the NAS part of the interaction between the UE, gNB, and AMF (5GC entity) when the UE transitions from RRC_IDLE to RRC_CONNECTED (see TS 38.300 v15.6.0).

[0108] RRC is a higher layer signaling protocol used to configure the UE and gNB. The AMF prepares UE context data (including, for example, PDU session context, security keys, UE radio capabilities, UE security capabilities, etc.) and sends it to the gNB along with an INITIAL CONTEXT SETUP REQUEST. The gNB then activates AS security together with the UE. This is done by the gNB sending a SecurityModeCommand message to the UE, and the UE responding with a SecurityModeComplete message to the gNB. The gNB then sends an RRCReconfiguration message to the UE, and upon receiving an RRCReconfigurationComplete from the UE, the gNB performs reconfiguration to set up Signaling Radio Bearer 2 (SRB2) and Data Radio Bearer (DRB). For signaling-only connections, the steps related to RRCReconfiguration are omitted because SRB2 and DRB are not set up. Finally, the gNB notifies the AMF that the setup procedure is complete with an INITIAL CONTEXT SETUP RESPONSE.

[0109] Therefore, the present disclosure provides a 5th Generation Core (5GC) entity (e.g., AMF, SMF, etc.) that includes: a control circuit that, upon operation, establishes a Next Generation (NG) connection with a gNodeB; and a transmitter that, upon operation, transmits an initial context setup message to the gNodeB via the NG connection so that a signaling radio bearer between the gNodeB and a user equipment (UE) is set up. Specifically, the gNodeB transmits Radio Resource Control (RRC) signaling, including a resource allocation configuration information element (IE), to the UE via the signaling radio bearer. The UE then transmits in uplink or receives in downlink based on the resource allocation configuration.

[0110] <QoS Control> The 5G Quality of Service (QoS) model is based on QoS flows and supports both QoS flows that require a guaranteed flow bit rate (Guaranteed Bit Rate QoS flows (GBR)) and QoS flows that do not require a guaranteed flow bit rate (non-GBR QoS flows). Thus, at the NAS level, a QoS flow is the finest granularity of QoS classification in a PDU session. A QoS flow is identified within a PDU session by a QoS Flow ID (QFI) carried in an encapsulation header over the NG-U interface.

[0111] For each UE, 5GC establishes one or more PDU sessions. For each UE, the NG-RAN establishes, for example, at least one Data Radio Bearer (DRB) for each PDU session. Additional DRBs for the QoS flows of that PDU session can be configured later (when this is up to the NG-RAN). The NG-RAN maps packets belonging to different PDU sessions to different DRBs. NAS-level packet filters in the UE and 5GC associate UL and DL packets with QoS flows, while AS-level mapping rules in the UE and NG-RAN associate UL and DL QoS flows with DRBs.

[0112] (Open-RAN) The base station described in each embodiment (for example, a 5G NR base station called a gNB) may be configured with three functional modules: a Centralized Unit (CU), a Distributed Unit (DU), and a Radio Unit (RU).

[0113] A CU may be referred to as a centralized node, aggregation node, central station, aggregation station, or centralized unit. A DU may be referred to as an O-RAN Distributed Unit (O-DU), distributed node, distributed station, or distributed unit. An RU may be referred to as an O-RAN Radio Unit (O-RU), radio equipment, radio node, radio station, antenna unit, or radio unit.

[0114] There are several split options for the functional split configuration (or functional split point) between CU, DU, and RU. The term "functional split point" is sometimes referred to as "split," "option," or "split option."

[0115] Examples of "division options" include the following division options 1 to 8. The functions of the base station described in each embodiment may be divided into a CU, a DU, and an RU by any of the following division options 1 to 8. For example, the CU, DU, and RU may be functionally divided, or the functions may be divided only between the CU and DU or only between the DU and RU. (1) Segmentation option 1: Between RRC (radio resource control) and PDCP (2) Segmentation option 2: Between PDCP and RLC (High-RLC) (3) Segmentation option 3: Between High-RLC and Low-RLC (4) Segmentation option 4: Between RLC (Low-RLC) and MAC (High-MAC) (5) Segmentation option 5: Between High-MAC and Low-MAC (6) Segmentation option 6: Between MAC (Low-MAC) and PHY (High-PHY) (7) Segmentation option 7: Between High-PHY and Low-PHY (8) Segmentation option 8: Between PHY (Low-PHY) and RF

[0116] The functional split point between the CU and O-DU may be split option 2. The section between the CU and O-DU is called midhaul, and the F1 interface is specified by 3GPP. The section between the O-DU and O-RU is called fronthaul, and the functional split point may be split option 7-2x, which is adopted as the O-RAN fronthaul specification.

[0117] Figure 14 shows an example of functional division of the gNB base station functions into CU, O-DU, and O-RU using Split Option 2 and Split Option 7-2x.

[0118] The CU may have, for example, a radio resource control (RRC) function, a service data adaptation protocol (SDAP) function, and a packet data convergence protocol (PDCP) function.

[0119] The O-DU may include, for example, a radio link control (RLC) function, a MAC function, and a higher physical layer (HIGH-PHY) function. The HIGH-PHY function may include an encoding function, a scrambling function, a modulation function, a layer mapping function, a precoding function, and a resource element (RE) mapping function for downlink (DL) transmission. The HIGH-PHY function may also include a decoding function, a descrambling function, a demodulation function, a layer demapping function, and a resource element (RE) demapping function for uplink (UL) reception.

[0120] The O-RU may have, for example, a LOW-PHY function and an RF function. The LOW-PHY function may also have, for downlink transmission, a beamforming function, an IFFT (Inverse First Fourier Transform) + CP (Cyclic Prefix) assignment function, and a D / A (Digital to Analog) conversion function. The LOW-PHY function may also have, for uplink reception, an A / D (Analog to Digital) conversion function, a CP removal + FFT (First Fourier Transform) function, and a beamforming function.

[0121] In addition, if the O-DU does not have a precoding function, the O-RU may have a precoding function.

[0122] The O-RU may have functionality related to LBT (listen before talk).

[0123] The evolving Common Public Radio Interface (eCPRI) is specified as the communication method between the O-DU and O-RU in Split Option 7-2x. In Split Option 7-2x, eCPRI transmits and receives sampling sequences of the in-phase (I) and quadrature (Q) components of OFDM signals in the frequency domain, as well as information used for beamforming in antennas and time synchronization signals.

[0124] Information transmitted by the signals described in each embodiment (PDCCH, PUCCH, PDSCH, PUSCH, MAC CE, RRC, etc.) may be transmitted between the O-DU and the O-RU via the eCPRI User Plane (U-Plane) or Control Plane (C-Plane).

[0125] When the functions described in each embodiment are performed in the O-RU by functional division, the O-DU may control the O-RU by transmitting information for controlling the functions via a control signal (e.g., eCPRI) between the O-DU and the O-RU.

[0126] When the functions described in each embodiment are performed in the O-DU by functional division, the O-RU may receive the results of the functions performed in the O-DU via a control signal (e.g., eCPRI) and control the O-RU based on the received results.

[0127] The CU, O-DU, and O-RU may be deployed in physically different devices with their respective functions connected by optical fiber or the like, or some or all of their functions may be deployed in the same physical device.

[0128] The CU and O-DU may be logical entities implemented as software running on a server in the cloud or the like as a virtualized RAN (virtual Radio Access Network: vRAN). Also, some or all of the functions of the CU and O-DU may be provided as a virtualized network function (Network Functions Virtualization: NFV) service.

[0129] The transceiver does not have to be a radio transceiver, but may be, for example, a network transceiver, an optical transceiver, etc. The radio resources allocated by the O-DU may be resources for wireless communication between the O-RU and the UE.

[0130] The present disclosure can be realized by software, hardware, or software in conjunction with hardware. Each functional block used in the description of the above embodiments may be partially or entirely realized as an LSI, which is an integrated circuit, and each process described in the above embodiments may be partially or entirely controlled by a single LSI or a combination of LSIs. The LSI may be composed of individual chips, or may be composed of a single chip that includes some or all of the functional blocks. The LSI may have data input and output. Depending on the degree of integration, the LSI may also be called an IC, system LSI, super LSI, or ultra LSI.

[0131] The integrated circuit method is not limited to LSI, and may be realized by a dedicated circuit, a general-purpose processor, or a dedicated processor. Also, a field programmable gate array (FPGA) that can be programmed after LSI manufacturing, or a reconfigurable processor that can reconfigure the connections and settings of circuit cells within the LSI, may be used. The present disclosure may be realized as digital processing or analog processing.

[0132] Furthermore, if an integrated circuit technology that can replace LSI emerges due to advances in semiconductor technology or other derivative technologies, it is natural that such technology may be used to integrate functional blocks. The application of biotechnology, etc. is also a possibility.

[0133] The present disclosure may be implemented in any type of apparatus, device, or system (collectively referred to as a communications apparatus) that has a communications function. The communications apparatus may include a radio transceiver and processing / control circuitry. The radio transceiver may include a receiver and a transmitter, or both functions. The radio transceiver (transmitter and receiver) may include a radio frequency (RF) module and one or more antennas. The RF module may include an amplifier, an RF modulator / demodulator, or the like. Non-limiting examples of communication devices include telephones (e.g., cell phones, smartphones), tablets, personal computers (PCs) (e.g., laptops, desktops, notebooks), cameras (e.g., digital still / video cameras), digital players (e.g., digital audio / video players), wearable devices (e.g., wearable cameras, smartwatches, tracking devices), game consoles, digital book readers, telehealth / telemedicine devices, communication-enabled vehicles or mobile transportation (e.g., cars, airplanes, ships), and combinations of the above devices.

[0134] The communication devices are not limited to portable or mobile devices, but also include any kind of non-portable or fixed equipment, devices, and systems, such as smart home devices (such as home appliances, lighting equipment, smart meters or measuring devices, control panels, etc.), vending machines, and any other "things" that may exist on an IoT (Internet of Things) network.

[0135] Communications include data communications via cellular systems, wireless LAN systems, communication satellite systems, and the like, as well as data communications via combinations of these.

[0136] A communications apparatus also includes devices such as controllers and sensors connected or coupled to a communications device that performs the communications functions described in this disclosure, such as controllers and sensors that generate control and data signals used by the communications device to perform the communications functions of the communications apparatus.

[0137] The communication apparatus also includes infrastructure facilities, such as base stations, access points, and any other apparatus, device, or system that communicates with or controls the various apparatuses listed above, but are not limited to these.

[0138] A base station according to one embodiment of the present disclosure includes a control circuit that sets power-related information regarding the transmission power of a measurement signal for measuring interference between base stations, and a transmission circuit that transmits control information including the power-related information and the measurement signal to other base stations.

[0139] In one embodiment of the present disclosure, the power-related information is information indicating the transmission power or information indicating a ratio between the transmission power and a transmission power of a predetermined signal.

[0140] In one embodiment of the present disclosure, the control information further includes information related to the antenna.

[0141] In one embodiment of the present disclosure, the information regarding the antenna includes information indicating the antenna gain, information indicating whether the transmit beam and receive beam have the same antenna configuration in SBFD and TDD, information indicating whether the number of transmit antenna elements and the number of receive antenna elements and the transceiver unit are the same, information indicating whether different associated IDs are assigned in SBFD and TDD, or information indicating whether the associated ID can be used in SBFD.

[0142] In one embodiment of the present disclosure, the control information includes the power-related information for each component carrier and information regarding the antenna for each component carrier.

[0143] In one embodiment of the present disclosure, the control information includes information indicating whether or not CLI reduction processing is recommended for each slot.

[0144] A base station according to one embodiment of the present disclosure includes control information including power-related information regarding the transmission power of a measurement signal for measuring interference between base stations, a receiving circuit for receiving the measurement signal, and a control circuit for controlling the interference between base stations using the control information and the measurement signal.

[0145] In one embodiment of the control method of the present disclosure, a base station sets power-related information regarding the transmission power of a measurement signal for measuring interference between base stations, and transmits control information including the power-related information and the measurement signal to other base stations.

[0146] In one embodiment of the control method of the present disclosure, a base station receives control information including power-related information regarding the transmission power of a measurement signal for measuring interference between base stations, and the measurement signal, and controls the interference between base stations using the control information and the measurement signal.

[0147] The disclosures of the specification, drawings and abstract contained in Japanese Patent Application No. 2024-113377, filed on July 16, 2024, are incorporated herein by reference in their entirety.

[0148] One embodiment of the present disclosure is useful in wireless communication systems.

[0149] REFERENCE SIGNS LIST 100 Base station 101 Receiving unit 102 Demodulation and decoding unit 103 CLI measurement unit 104 Scheduling unit 105 Control information holding unit 106 Data and control information generation unit 107 Encoding and modulation unit 108 Transmitting unit 109 CLI measurement information setting unit 110 Inter-base station communication IF

Claims

1. A base station comprising: a control circuit that sets power-related information regarding the transmission power of a measurement signal for measuring interference between base stations; and a transmission circuit that transmits control information including the power-related information and the measurement signal to other base stations.

2. The base station according to claim 1, wherein the power-related information is information indicating the transmission power or information indicating a ratio between the transmission power and the transmission power of a predetermined signal.

3. The base station of claim 1, wherein the control information further includes information regarding an antenna.

4. The base station described in claim 3, wherein the information regarding the antenna is information indicating antenna gain, information indicating whether the transmit beam and receive beam have the same antenna configuration in SBFD and TDD, information indicating whether the number of transmit antenna elements, the number of receive antenna elements, and the transceiver unit are the same, information indicating whether different associated IDs are assigned in SBFD and TDD, or information indicating whether the associated ID can be used in SBFD.

5. The base station according to claim 3, wherein the control information includes the power-related information for each component carrier and information regarding the antenna for each component carrier.

6. The base station according to claim 1, wherein the control information includes information indicating whether CLI reduction processing is recommended for each slot.

7. A base station comprising: control information including power-related information regarding the transmission power of a measurement signal for measuring interference between base stations, and a receiving circuit for receiving the measurement signal; and a control circuit for controlling the interference between base stations using the control information and the measurement signal.

8. A control method in which a base station sets power-related information regarding the transmission power of a measurement signal for measuring interference between base stations, and transmits control information including the power-related information and the measurement signal to other base stations.

9. A control method in which a base station receives control information including power-related information regarding the transmission power of a measurement signal for measuring interference between base stations, and the measurement signal, and controls the interference between base stations using the control information and the measurement signal.

10. An integrated circuit that controls the processing of a base station, the processing including: a process of setting power-related information regarding the transmission power of a measurement signal for measuring interference between base stations; and a process of transmitting control information including the power-related information and the measurement signal to other base stations.

11. An integrated circuit that controls the processing of a base station, the processing including: a process of receiving control information including power-related information regarding the transmission power of a measurement signal for measuring interference between base stations, and the measurement signal; and a process of controlling the interference between base stations using the control information and the measurement signal.

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