WO2024181301A1 - Base station - Google Patents

Abstract

Provided is a base station that can transmit information related to appropriate measurement resources/settings in accordance with the period of CLI measurement when measuring CLI. The base station comprises: a transmission unit that transmits information related to measurement resources/settings for measuring crosslink interference to another base station in a duplexing method that can use a plurality of subbands constituting a time division duplexing band; and a control unit that selects the information on the basis of the period at which the other base station measures the crosslink interference.

Description

Base Station

This disclosure relates to a base station that measures CLI when SBFD is applied.

The 3rd Generation Partnership Project (3GPP) is developing specifications for the 5th generation mobile communication system (5G, also known as New Radio (NR) or Next Generation (NG)) and is also developing specifications for the next generation of mobile communication systems, known as Beyond 5G, 5G Evolution or 6G.

In base stations (next generation NodeB, gNB), crosslink interference (CLI) is known to occur when downlink (DL) transmissions from other gNBs interfere with uplink (UL) reception from terminals (User Equipment, UE). The gNB that is subject to interference can measure CLI to avoid CLI occurring between it and the interfering gNB.

In particular, when subband non-overlapping full duplex (SBFD) is applied, the impact of CLI may be significant. SBFD is a duplexing method that enables simultaneous use of DL and UL by utilizing multiple subbands that make up a time division duplex (TDD) band. Therefore, when SBFD is applied, DL transmissions from other gNBs may interfere with UL reception from the UE, which may increase the frequency of CLI occurrence. For this reason, it is being considered to measure CLI even when SBFD is applied (Non-Patent Documents 1 and 2).

Incidentally, when measuring CLI, information related to measurement resources/settings needs to be exchanged between the interfering gNB and the gNB receiving the interference. However, there is a problem in that the appropriate information related to measurement resources/settings differs depending on the CLI measurement period.

The present disclosure has been made in light of these circumstances, and aims to provide a base station that can transmit information related to appropriate measurement resources/settings according to the CLI measurement period when measuring the CLI.

One aspect of the disclosure is a base station (gNB100B) that includes a transmitter (radio signal transmitter/receiver 110) that transmits information related to measurement resources/settings for measuring crosslink interference to another base station (gNB100A) in a duplexing scheme that can utilize multiple subbands that make up a time division duplexing band, and a control unit (control signal/reference signal processor 140) that selects the information based on the period at which the other base station (gNB100A) measures the crosslink interference.

FIG. 1 is a diagram showing the overall configuration of a wireless communication system. FIG. 2 shows a diagram illustrating frequency ranges used in a wireless communication system. FIG. 3 is a diagram showing an example of the configuration of a radio frame, a subframe, a slot, and a symbol used in a radio communication system. FIG. 4 is a diagram showing the occurrence of CLI between base stations. FIG. 5 is a diagram illustrating an example of the configuration of an SBFD slot. FIG. 6 is a functional block diagram of the base station. FIG. 7 is a functional block diagram of the terminal. FIG. 8 is a diagram illustrating an example of resources for performing CLI measurement. FIG. 9 is a diagram illustrating an example of resources for performing CLI measurement. FIG. 10 is a diagram illustrating an example of resources for performing CLI measurement. FIG. 11 is a diagram illustrating an example of a hardware configuration of a base station and a terminal. FIG. 12 is a diagram illustrating an example of the configuration of a vehicle.

The following describes the embodiments with reference to the drawings. Note that identical or similar symbols are used for identical functions and configurations, and descriptions thereof will be omitted as appropriate.

(1) Overall Schematic Configuration of Wireless Communication System The wireless communication system 10 shown in Fig. 1 is a wireless communication system conforming to a method called 5G. On the other hand, the wireless communication system 10 may be a wireless communication system conforming to a method called Beyond 5G, 5G Evolution, or 6G.

The wireless communication system 10 can support Massive Multiple-Input Multiple-Output (Massive MIMO), which generates more directional beams by controlling the wireless signals transmitted from multiple antenna elements, Carrier Aggregation (CA), which bundles together multiple component carriers (CC), and Dual Connectivity (DC), which communicates with two base stations simultaneously.

As shown in FIG. 1, the wireless communication system 10 includes a Next Generation-Radio Access Network (NG-RAN) 20, a base station (next generation NodeB, gNB) 100 connected to the NG-RAN 20, and a terminal (User Equipment, UE) 200 that performs wireless communication with the gNB 100. The NG-RAN 20 is connected to a core network (CN) not shown. The NG-RAN 20 and the CN may be simply referred to as a "network." Note that the specific configuration of the wireless communication system 10, for example the number of gNBs 100 and UEs 200, is not limited to the example shown in FIG. 1.

The wireless communication system 10 may also support a plurality of frequency ranges (FRs). That is, as shown in FIG. 2, the wireless communication system 10 may support the following FRs:
・FR1: 410MHz to 7.125GHz
・FR2-1: 24.25GHz to 52.6GHz
・FR2-2: Over 52.6GHz to 71GHz

In FR1, a subcarrier spacing (SCS) of 15, 30 or 60 kHz and a bandwidth (BW) of 5 to 100 MHz may be used. In FR2-1, an SCS of 60 or 120 kHz (which may include 240 kHz) and a BW of 50 to 400 MHz may be used.

In FR2-2, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) or Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) with a larger SCS may be applied to avoid increased phase noise.

Also, as shown in FIG. 3, one slot in the wireless communication system 10 is composed of 14 symbols. If this configuration is maintained, the larger (wider) the SCS is, the shorter the symbol period (and slot period) will be. Note that the SCS is not limited to the frequencies shown in FIG. 3, and may be, for example, frequencies such as 480 kHz and 960 kHz.

In addition, the number of symbols constituting one slot does not necessarily have to be 14 symbols, and may be, for example, 28 or 56 symbols. Furthermore, the number of slots per subframe may differ depending on the SCS.

Here, we briefly explain CLI and SBFD in the wireless communication system 10 of the embodiment.

First, referring to FIG. 4, a CLI that occurs between a gNB100 and another gNB100 will be described. The other gNB100 is, for example, adjacent to the gNB100, but is not limited to this. Here, the gNB100 that receives interference is referred to as gNB100A, and the gNB100 that causes interference is referred to as gNB100B. Also, the UE200 that communicates with gNB100A is referred to as UE200A, and the UE200 that communicates with gNB100B is referred to as UE200B.

As shown in FIG. 4, if a CLI occurs in gNB100A that interferes with DL transmission transmitted from gNB100B to UE200B (corresponding to the dashed line in the figure), UL reception from UE200A may be hindered. Therefore, gNB100A measures the CLI occurring between gNB100B based on DL transmission transmitted from gNB100B to UE200B, for example, a reference signal. Strictly speaking, it measures values such as Reference Signal Received Power (RSRP) and Reference Signal Received Quality (RSRQ), and predicts the occurrence of a CLI when the measured value falls below a predetermined threshold. Examples of reference signals are Demodulation Reference Signal (DMRS) and Channel State Information-Reference Signal (CSI-RS). Note that the reference signal may include a synchronization signal block (SSB). This allows gNB100A to anticipate the occurrence of a CLI and set up a schedule for transmitting and receiving radio signals between gNB100A and UE200A so that a CLI does not occur.

Next, SBFD, a duplexing method used in the wireless communication system 10, will be described with reference to FIG. 5. In the following, a slot that can use multiple subbands that make up the TDD band is referred to as an SBFD slot. SBFD can be said to be a duplexing method in which multiple subbands are specified within the TDD band, or a duplexing method in which UL and DL are assigned non-overlapping in the frequency direction within a specified time based on TDD, or a full duplexing of the subbands.

As shown in Figure 5, DL or UL is assigned to each subband that constitutes the SBFD slot. In the following, a subband to which DL is assigned is also called a DL subband, and a subband to which UL is assigned is also called a UL subband. In Figure 5, slots or subbands marked with "D" are DL slots or DL subbands, and slots or subbands marked with "U" are UL slots or UL subbands.

(2) Functional block configuration of wireless communication system (2.1) Functional block configuration of base station As shown in FIG. 6, the gNB 100 comprises a wireless signal transceiver unit 110, an amplifier unit 120, a modulation/demodulation unit 130, a control signal/reference signal processing unit 140, an encoding/decoding unit 150, a data transceiver unit 160, and a control unit 170.

The wireless signal transmitting/receiving unit 110 transmits and receives wireless signals to and from the UE 200. The wireless signal transmitting/receiving unit 110 may be configured as a transmitting unit that transmits wireless signals to the UE 200, and a receiving unit that receives wireless signals from the UE 200. The wireless signals include a control signal, a reference signal, and data.

The wireless signal transceiver 110 of the embodiment transmits and receives wireless signals to and from other gNBs 100. The wireless signal transceiver 110 may be configured as a transmitter that transmits wireless signals to other gNBs 100, and a receiver that receives wireless signals from other gNBs 100. The wireless signals include control signals, reference signals, and data.

In addition, in another gNB100, the wireless signal transceiver unit 110 of the embodiment transmits information related to measurement resources/settings to the gNB100 when the gNB100 measures the CLI. Note that, as described later, the measurement resources/settings may also be referred to as CLI measurement resources.

The amplifier unit 120 is composed of a power amplifier (PA)/low noise amplifier (LNA) etc. The amplifier unit 120 amplifies the wireless signal output from the wireless signal transmitting/receiving unit 110. The amplifier unit 120 also amplifies the wireless signal output from the modulation/demodulation unit 130.

The modem unit 130 performs data modulation/demodulation, transmission power setting, resource block allocation, etc. for each predetermined communication destination (UE 200 or another UE). CP-OFDM/DFT-S-OFDM may be applied to the modem unit 130. Furthermore, DFT-S-OFDM may be used not only for the uplink (UL) but also for the downlink (DL).

The control signal/reference signal processing unit 140 performs processing related to control signals transmitted and received between the UE 200, such as radio resource control (RRC) signaling.

The control signal/reference signal processing unit 140 performs processing related to reference signals transmitted and received between the UE 200, such as Demodulation Reference Signal (DMRS), Phase Tracking Reference Signal (PTRS), Channel State Information-Reference Signal (CSI-RS), Sounding Reference Signal (SRS), and Positioning Reference Signal (PRS).

The channels include control channels and data channels. The control channels include the physical uplink control channel (PUCCH), physical downlink control channel (PDCCH), physical random access channel (PRACH), physical broadcast channel (PBCH), etc. The data channels include the physical uplink shared channel (PUSCH), physical downlink shared channel (PDSCH), etc.

The control signal/reference signal processing unit 140 of the embodiment measures CLI occurring between other gNBs 100 based on wireless signals, such as reference signals, transmitted from other gNBs 100. Strictly speaking, it measures values such as RSRP and RSRQ, and predicts the occurrence of CLI when the measured values fall below a predetermined threshold.

Here, the other gNBs 100 transmit reference signals periodically (periodic, semi-periodic) or aperiodic (aperiodic), and the control signal/reference signal processor 140 measures the CLI based on a reference signal in a specific resource among these reference signals. Hereinafter, the specific resource is also referred to as a CLI measurement resource.

The CLI measurement resource is a resource that has the same frequency domain and time domain (or at least a part of the frequency domain and time domain overlaps) as the resource for which the radio signal transceiver 110 transmits a reference signal to the UE 200 (see FIG. 8). When SBFD is applied, the frequency domain may be interpreted as a subband. The left diagram in FIG. 8 shows a mode in which SBFD is not applied, and the right diagram shows a mode in which SBFD is applied. In the diagram, RS for UEs is a reference signal transmitted to the UE 200, and RS for gNB-to-gNB CLI is a reference signal for measuring CLI occurring between other gNBs 100.

The CLI measurement resource is a resource that has a different frequency domain and the same time domain (or at least a part of the time domain overlaps) as the resource for which the radio signal transceiver 110 transmits a reference signal to the UE 200 (see FIG. 9). When SBFD is applied, the frequency domain may be interpreted as a subband. The left diagram in FIG. 9 shows a mode in which SBFD is not applied, and the right diagram shows a mode in which SBFD is applied. In the diagram, RS for UEs is a reference signal transmitted to the UE 200, and RS for gNB-to-gNB CLI is a reference signal for measuring CLI occurring between other gNBs 100.

The CLI measurement resource is a resource that has the same frequency domain (or at least a part of the frequency domain overlaps) but a different time domain as the resource for transmitting a reference signal to the UE200 by the radio signal transmitting/receiving unit 110 (see FIG. 10). When SBFD is applied, the frequency domain may be interpreted as a subband. The left diagram in FIG. 10 shows a mode in which SBFD is not applied, and the right diagram shows a mode in which SBFD is applied. In the diagram, RS for UEs is a reference signal transmitted to the UE200, and RS for gNB-to-gNB CLI is a reference signal for measuring CLI occurring between other gNBs100.

In addition, in another gNB100, the control signal/reference signal processing unit 140 of the embodiment selects information related to the CLI measurement resource to be transmitted by the radio signal transmitting/receiving unit 110 based on the period during which the gNB100 performs CLI measurements.

Information related to the CLI measurement resource selected by the control signal and reference signal processing unit 140 (including frequency domain and/or time domain information of the reference signal for measuring the CLI, as will be described in detail later) may be shared in advance between the gNBs 100, or may be exchanged between the gNBs 100. Furthermore, the information related to the CLI measurement resource may be transmitted to the UE 200. These exchanges and transmissions may be performed by the radio signal transmitting/receiving unit 110.

The encoding/decoding unit 150 performs operations such as dividing/concatenating and coding/decoding the data contained in the wireless signal for each predetermined communication destination (UE 200 or another UE).

Specifically, the encoding/decoding unit 150 decodes the data output from the modem unit 130 and concatenates the decoded data. The encoding/decoding unit 150 also divides the data output from the data transmission/reception unit 160 into data of a predetermined size and performs coding on the divided data.

The data transmission/reception unit 160 transmits and receives data to and from the UE 200. Specifically, the data transmission/reception unit 160 performs assembly/disassembly of Protocol Data Units (PDUs)/Service Data Units (SDUs) between multiple layers. The multiple layers include a Medium Access Control (MAC) layer, a Radio Link Control (RLC) layer, and a Packet Data Convergence Protocol (PDCP) layer. The data transmission/reception unit 160 also performs data error correction and retransmission control based on Hybrid Automatic Repeat Request (HARQ).

The control unit 170 controls the gNB 100. The control unit 170 controls, for example, the transmission and reception of radio signals by the radio signal transceiver unit 110, the amplification by the amplifier unit 120, the data modulation/demodulation by the modem unit 130, the signal processing by the control signal and reference signal processing unit 140, the coding/decoding by the encoding/decoding unit 150, and the transmission and reception of data by the data transceiver unit 160.

(2.2) Functional Block Configuration of Terminal As shown in FIG. 7, the UE 200 includes a radio signal transmitting/receiving unit 210 and a control unit 220.

The wireless signal transmitting/receiving unit 210 transmits and receives wireless signals to and from the gNB100. The wireless signal transmitting/receiving unit 210 may be configured as a transmitting unit that transmits wireless signals to the gNB100, and a receiving unit that receives wireless signals from the gNB100. The wireless signals include control signals, reference signals, and data.

The control unit 220 controls the UE 200. The control unit 220 controls, for example, the transmission and reception of radio signals by the radio signal transmission and reception unit 210.

(3) Operation of Wireless Communication System (3.0) Issues (3.0.1) Issue 1
When SBFD is applied in the wireless communication system 10, the control signal/reference signal processing unit 140 of the gNB 100 needs to select resources for measuring the CLI that occurs between the gNB 100 and other gNBs 100 so as not to impair the resource utilization efficiency improved by SBFD.

(3.0.2) Issue 2
When measuring CLI, information on measurement resources/settings needs to be exchanged between the interfering gNB and the interfered gNB. However, there is a problem in that the appropriate information on measurement resources/settings differs depending on the CLI measurement period.

(3.1) Operation example 1
With reference to Fig. 8, a description will be given of a mode in which CLI is measured based on a reference signal transmitted from another gNB 100 in a resource in which the subband and time domain are the same as those of a reference signal transmitted to a UE 200 (or in which the subband and time domain overlap at least partially). Note that the left diagram in Fig. 8 shows a mode in which SBFD is not applied, and the right diagram shows a mode in which SBFD is applied. In the following description, the unit of the time domain in which SBFD is applied is a slot.

Here, the subband and time domain are the same means, for example, that the reference signals completely overlap in the frequency direction and the time direction. Also, the subband and time domain overlap at least partially means, for example, that when the reference signal occupies multiple resource blocks in the frequency direction and the time direction, it overlaps with at least one of the resource blocks in the frequency direction and the time direction.

As shown in the right diagram of Figure 8, the control signal/reference signal processing unit 140 measures the CLI occurring between other gNBs 100 based on reference signals transmitted from other gNBs 100, including reference signals (RS for gNB-to-gNB CLI in the diagram) transmitted in resources having the same subband and time domain (or at least a portion of the subband and time domain overlaps) as the reference signal (RS for UEs in the diagram) transmitted to the UE 200 by the radio signal transceiver unit 110.

Note that the resource (CLI measurement resource) for the control signal/reference signal processing unit 140 to measure the CLI may be interpreted as a resource for the radio signal transmitting/receiving unit 110 to receive a reference signal transmitted from another gNB100. Therefore, the gNB100 transmits to the UE200 and receives from the other gNB100 in resources with the same frequency domain and time domain (or where the subband and time domain overlap at least partially). Such transmission and reception is realized by space division multiplexing (SDM), such as beam switching of the gNB100.

In addition, in the right diagram of Figure 8, part of the UL resource is indicated by a dashed line. This indicates that, as an exception, the reference signal may be transmitted in DL in the UL resource of the SBFD slot.

The following describes detailed settings related to reference signals depending on whether the reference signal is common or non-common with other gNBs100. Note that "common between gNBs100" means that information that the reference signals occupy the same resources in the frequency domain and the time domain is shared in advance between gNBs100. "Non-common between gNBs100" means that information that the reference signals occupy the same resources in the frequency domain and the time domain is not shared in advance between gNBs100.

(3.1.1) When a common reference signal is used between base stations A common reference signal between gNBs 100 is, for example, SSB or DMRS for Type 0 PDCCH.

(3.1.1.1) Reference Signal Configuration The reference signal configuration may use existing configuration such as a cell-specific signal configuration. The cell-specific signal configuration is, for example, an SSB Transmission Configuration (STC) in the IAB-node.

(3.1.1.2) Exchange of Information Related to CLI Measurement Resources When measuring a CLI based on a reference signal common between gNBs 100, the gNB 100 receiving interference implicitly knows the CLI measurement resource, i.e., the resource of the reference signal transmitted from the interfering gNB 100. Therefore, information related to the CLI measurement resource does not need to be exchanged because it is shared in advance with the interfering gNB 100.

In addition, information related to CLI measurement resources may be exchanged in a limited manner. For example, parameters specific to each gNB100, such as the physical cell ID and the number of SSBs, may be exchanged.

(3.1.2) When a non-common reference signal is used between base stations Reference signals that are non-common between gNBs 100 include, for example, DMRS for PDSCH, DMRS for PDCCH, and CSI-RS.

(3.1.2.1) Reference Signal Configuration For the reference signal configuration, existing configuration such as a configuration for UE 200 may be used.

On the other hand, the reference signal for measuring the CLI may be set to be transmitted only in a specific slot or subband. The specific slot or subband may be, for example, a DL slot, a DL subband, a UL slot, or a UL subband.

(3.1.2.2) Exchange of Information Related to CLI Measurement Resources When measuring a CLI based on a reference signal that is not common between gNBs 100, the gNB 100 receiving interference needs to explicitly know the CLI measurement resource, i.e., the resource of the reference signal transmitted from the interfering gNB 100. Therefore, information related to the CLI measurement resource needs to be exchanged between the interfering gNB 100.

The information related to the CLI measurement resource may include configuration information for UE200 or a part of the configuration information. The part of the configuration information for UE200 is, for example, frequency/time domain resources and periodicity.

In addition, the information related to the CLI measurement resource may include, for example, the period, duration, and frequency domain resources of the measurement window when a measurement window is set for the CLI measurement resource.

(3.1.2.3) Instruction to Terminal When SBFD is applied, if the CLI measurement resource exists in the UL resource of the SBFD slot, information related to the CLI measurement resource may be transmitted to the UE 200 by the radio signal transceiver unit 110. This enables the UE 200 to avoid UL transmission in the UL resource in which the CLI measurement resource is set.

(3.2) Operation example 2
With reference to Fig. 9, a description will be given of an aspect of measuring CLI based on a reference signal transmitted from another gNB 100 in a resource in which the subband is different from that of a reference signal transmitted to the UE 200 and the time domain is the same (or at least a part of the time domain overlaps). Note that the left diagram in Fig. 9 shows an aspect in which SBFD is not applied, and the right diagram shows an aspect in which SBFD is applied. In the following description, the unit of the time domain to which SBFD is applied is a slot.

Here, having the same time domain means, for example, that the reference signals completely overlap in the time direction. Also, at least a portion of the time domain overlaps means, for example, that when the reference signal occupies multiple resource blocks in the time direction, it overlaps with at least one of the resource blocks in the time direction.

As shown in the right diagram of Figure 9, the control signal/reference signal processing unit 140 measures the CLI occurring with other gNBs 100 based on reference signals transmitted from other gNBs 100, which are reference signals (RS for gNB-to-gNB CLI in the diagram) transmitted in resources that have a different subband and the same time domain (or at least a portion of the time domain overlaps) as the reference signal (RS for UEs in the diagram) transmitted by the radio signal transceiver unit 110 to the UE 200.

Note that the resource (CLI measurement resource) for the control signal/reference signal processing unit 140 to measure the CLI may be interpreted as a resource for the radio signal transmitting/receiving unit 110 to receive a reference signal transmitted from another gNB100. Therefore, the gNB100 transmits to the UE200 and receives from the other gNB100 in resources that have different frequency domains and the same time domain (or at least a portion of the time domains overlap). Such transmission and reception is achieved, for example, by frequency division multiplexing (FDM) or SBFD.

In addition, in the right diagram of Figure 9, part of the UL resource is indicated by a dashed line. This indicates that, as an exception, the reference signal may be transmitted in DL in the UL resource of the SBFD slot.

The following describes detailed settings related to reference signals depending on whether the reference signal is common or non-common with other gNBs100. Note that "common between gNBs100" means that information that the reference signals occupy the same resources in the frequency domain and the time domain is shared in advance between gNBs100. "Non-common between gNBs100" means that information that the reference signals occupy the same resources in the frequency domain and the time domain is not shared in advance between gNBs100.

(3.2.1) When a common reference signal is used between base stations A common reference signal between gNBs 100 is, for example, SSB or DMRS for Type 0 PDCCH.

(3.2.1.1) Reference Signal Configuration The reference signal configuration may use existing configurations such as cell-specific signal configurations in the time domain. The cell-specific signal configuration is, for example, SSB Transmission Configuration (STC) in the IAB-node.

The configuration of the reference signals needs to be additionally performed for the frequency domain. For example, a gap between the reference signals may be configured, or the reference signals for measuring the CLI may be configured to be transmitted only in specific slots or subbands, such as DL slots, DL subbands, UL slots, and UL subbands.

(3.2.1.2) Exchange of Information Related to CLI Measurement Resources When measuring the CLI based on a reference signal common between gNBs 100, the interfered gNB 100 implicitly knows the CLI measurement resource, i.e., the resource of the reference signal transmitted from the interfering gNB 100, in the time domain. Therefore, information related to the CLI measurement resource does not need to be exchanged because it is shared in advance between the interfering gNB 100 and the interfered gNB 100 in the time domain.

On the other hand, information regarding measurement resources needs to be exchanged or predefined for the frequency domain.

In addition, information related to measurement resources may be exchanged in a limited manner. For example, parameters specific to each gNB100, such as physical cell IDs and the number of SSBs, may be exchanged.

(3.2.2) When a non-common reference signal is used between base stations A non-common reference signal between gNBs 100 is, for example, DMRS for PDSCH.

(3.2.2.1) Reference Signal Configuration For the reference signal configuration, existing configuration such as a configuration for UE 200 may be used.

On the other hand, the reference signal for measuring the CLI may be set to be transmitted only in a specific slot or subband. The specific slot or subband may be, for example, a DL slot, a DL subband, a UL slot, or a UL subband.

(3.2.2.2) Exchange of Information Related to CLI Measurement Resources When measuring a CLI based on a reference signal that is not common between gNBs 100, the gNB 100 receiving interference needs to explicitly know the CLI measurement resource, i.e., the resource of the reference signal transmitted from the interfering gNB 100. Therefore, information related to the CLI measurement resource needs to be exchanged between the interfering gNB 100.

The information related to the CLI measurement resource may be configuration information for the gNB100.

In addition, the information related to the CLI measurement resources may include configuration information for the UE 200 and additional information, such as frequency domain resources.

In addition, the information related to the CLI measurement resource may include part of the configuration information for the UE 200. The part of the configuration information for the UE 200 may be, for example, frequency/time domain resources and periods.

In addition, the information related to the CLI measurement resource may include, for example, the period, duration, and frequency domain resources of the measurement window when a measurement window is set for the CLI measurement resource.

(3.2.2.3) Instruction to Terminal When SBFD is applied, if the CLI measurement resource exists in the UL resource of the SBFD slot, information related to the CLI measurement resource may be transmitted to the UE 200 by the radio signal transceiver unit 110. This enables the UE 200 to avoid UL transmission in the UL resource in which the CLI measurement resource is set.

(3.3) Operation example 3
With reference to Fig. 10, a description will be given of an aspect in which CLI is measured based on a reference signal transmitted from another gNB 100 in a resource having the same subband (or at least a part of the subband overlaps) as a reference signal transmitted to the UE 200 and a different time domain. Note that the left diagram in Fig. 10 shows an aspect in which SBFD is not applied, and the right diagram shows an aspect in which SBFD is applied. In the following description, the unit of the time domain to which SBFD is applied is a slot.

Here, the subbands being the same means, for example, that the reference signals completely overlap in the frequency direction. Also, that at least a portion of the subbands overlap means, for example, that when the reference signal occupies multiple resource blocks in the frequency direction, it overlaps with at least one of the resource blocks in the frequency direction.

As shown in the right diagram of FIG. 10, the control signal/reference signal processing unit 140 measures the CLI occurring with another gNB100 based on a reference signal (RS for gNB-to-gNB CLI in the diagram) transmitted from another gNB100, which is transmitted in a resource having the same subband (or at least a part of the subband overlaps) and a different time domain as the reference signal (RS for UEs in the diagram) transmitted by the radio signal transmitting/receiving unit 110 to the UE200. In this case, the radio signal transmitting/receiving unit 110 can transmit a radio signal to the UE200 in a resource (DL resource for UE in the diagram) having a different frequency domain and the same time domain (or at least a part of the time domain overlaps) as the CLI measurement resource (RS for gNB-to-gNB CLI in the diagram).

Note that the resource (CLI measurement resource) for the control signal/reference signal processing unit 140 to measure the CLI may be interpreted as a resource for the radio signal transmitting/receiving unit 110 to receive a reference signal transmitted from another gNB100. Therefore, the gNB100 transmits to the UE200 and receives from the other gNB100 in resources that have the same frequency domain (or at least a part of the frequency domain overlaps) but different time domains. Such transmission and reception is realized, for example, by time division multiplexing (TDM) or SBFD.

In addition, in the right diagram of Figure 10, part of the UL resource is indicated by a dashed line. This indicates that, as an exception, the reference signal may be transmitted in DL in the UL resource of the SBFD slot.

The following describes detailed settings related to reference signals depending on whether the reference signal is common or non-common with other gNBs100. Note that "common between gNBs100" means that information that the reference signals occupy the same resources in the frequency domain and the time domain is shared in advance between gNBs100. "Non-common between gNBs100" means that information that the reference signals occupy the same resources in the frequency domain and the time domain is not shared in advance between gNBs100.

(3.3.1) When a common reference signal is used between base stations A common reference signal between gNBs 100 is, for example, SSB or DMRS for Type 0 PDCCH.

(3.3.1.1) Reference Signal Configuration The reference signal configuration may use existing configurations such as cell-specific signal configurations in the frequency domain. The cell-specific signal configuration is, for example, SSB Transmission Configuration (STC) in the IAB-node.

In the reference signal for measuring the CLI, the frequency domain resources may be set to be the same as the frequency domain resources of the reference signal transmitted to UE 200, or may be set to be different.

The reference signal configuration needs to be additionally performed for the time domain. For example, a gap between reference signals may be configured, or the reference signal for measuring CLI may be configured to be transmitted only in a specific slot or subband, such as a DL slot, DL subband, UL slot, or UL subband.

The DL/UL resources for UE200 may or may not be frequency division multiplexed with the CLI measurement resources. For the DL resources for UE200, the gNB100 on the interfered side may require SBFD operation (SBFD operation enables reception of a reference signal for measuring the CLI and transmission to UE200). For the UL resources for UE200, the gNB100 on the interfered side may receive radio signals from the interfering gNB100 and UE200.

(3.3.1.2) Exchange of Information Related to CLI Measurement Resources When measuring a CLI based on a reference signal common between gNBs 100, the interfered gNB 100 implicitly knows the CLI measurement resource, i.e., the resource of the reference signal transmitted from the interfering gNB 100, in the frequency domain. Therefore, information related to the CLI measurement resource does not need to be exchanged because it is shared in advance between the interfering gNB 100 and the interferer gNB 100 in the frequency domain.

On the other hand, information regarding measurement resources needs to be exchanged or predefined for the time domain.

In addition, information related to measurement resources may be exchanged in a limited manner. For example, parameters specific to each gNB100, such as physical cell IDs and the number of SSBs, may be exchanged.

(3.3.2) When a non-common reference signal is used between base stations A non-common reference signal between gNBs 100 is, for example, DMRS for PDSCH.

(3.3.2.1) Reference Signal Configuration For the reference signal configuration, existing configuration such as a configuration for UE 200 may be used.

On the other hand, the reference signal for measuring the CLI may be set to be transmitted only in a specific slot or subband. The specific slot or subband may be, for example, a DL slot, a DL subband, a UL slot, or a UL subband.

(3.3.2.2) Exchange of Information Related to CLI Measurement Resources When measuring a CLI based on a reference signal that is not common between gNBs 100, the gNB 100 receiving interference needs to explicitly know the CLI measurement resource, i.e., the resource of the reference signal transmitted from the interfering gNB 100. Therefore, information related to the CLI measurement resource needs to be exchanged between the interfering gNB 100.

The information related to the CLI measurement resource may be configuration information for the gNB100.

In addition, the information related to the CLI measurement resources may include configuration information for the UE 200 and additional information such as time domain resources.

In addition, the information related to the CLI measurement resource may include part of the configuration information for the UE 200. The part of the configuration information for the UE 200 may be, for example, frequency/time domain resources and periods.

In addition, the information related to the CLI measurement resource may include, for example, the period, duration, and frequency domain resources of the measurement window when a measurement window is set for the CLI measurement resource.

(3.3.2.3) Instruction to Terminal When SBFD is applied, if the CLI measurement resource exists in the UL resource of the SBFD slot, information related to the CLI measurement resource may be transmitted to the UE 200 by the radio signal transceiver unit 110. This enables the UE 200 to avoid UL transmission in the UL resource in which the CLI measurement resource is set.

(3.4) Information on CLI measurement resources in IAB-node When gNB100 is an IAB-node, i.e., when gNB100 is composed of gNB-CU and gNB-DU, gNB-CU transmits the TDD DL/UL pattern received from other gNBs to each of the related gNB-DUs. Also, when a CLI is detected, gNB-DU transmits the TDD DL/UL pattern of the serving cell to gNB-CU. In this way, when gNB100 is an IAB-node, TDD DL/UL patterns are exchanged between gNB-CU and gNB-DU. Similarly, information on the above-mentioned CLI measurement resources may be exchanged between gNB-CU and gNB-DU.

(3.5) Information related to CLI measurement resources according to the period for measuring CLI (3.5.1) When the period is periodic This section describes information related to measurement resources/settings exchanged between gNBs when CLI measurement between gNBs is periodic.

The interfering gNB100 explicitly notifies the interfered gNB100 of information related to measurement resources/settings. The information may include the following:

Type of information Example: The information is for (indicates) periodic inter-gNB CLI measurements.
Frequency information e.g. center/start/end of frequency, RB/RBG frequency bandwidth/number Time information e.g. SFN, slot number, measurement resource period (e.g. 1/2/5 msec, 1/2/4/8 slots, 1/2/4/7 symbols)
・Subcarrier spacing e.g. 15kHz, 30kHz, 60kHz, 120kHz, 240kHz
- Transmission period Example: 5/10/20/40/80/160/320/640/1280msec
・Transmission timing offset Example: offset from cell-defined SSB (CD-SSB) ・Frequency offset Example: offset from cell-defined SSB (CD-SSB) ・Resource ID/beam information Example: SSB index, physical cell ID, CSI-RS resource ID

Also, the gNB100 receiving interference may implicitly determine information related to the measurement resources/settings. For example, if cell-defined SSB (CD-SSB) is used, the gNB100 receiving interference can know the time/frequency resources because it transmits SSB on the same time/frequency resources.

Once the gNB100 receiving the interference receives information regarding measurement resources/settings, it can start CLI measurements.

The gNB100 receiving interference can request the gNB100 causing the interference to exchange information regarding measurement resources/settings in order to measure the CLI.

(3.5.2) When the periodicity is semi-periodic This section describes information related to measurement resources/settings exchanged between gNBs when CLI measurements between gNBs are semi-periodic.

The interfering gNB100 explicitly notifies the interfered gNB100 of information related to measurement resources/settings. The information may include the following. Note that examples of each piece of information listed below may be the same as (3.5.1).

・Frequency information ・Time information ・Subcarrier spacing ・Transmission period ・Transmission timing offset ・Resource ID/beam information

The interfering gNB100 may also notify the interfering gNB100 of the start/stop (activate/deactivate) of CLI measurement.

When the interfering gNB100 notifies the start/stop of CLI measurement, it may start/stop transmitting signals/channels for CLI measurement between gNBs. In addition, the interfering gNB100 may notify the timing (e.g. absolute time) of the start/stop of CLI measurement, and this timing may be defined in the standard.

The gNB100 receiving the interference can request the gNB100 causing the interference to perform the start/stop described above.

(3.5.3) When the period is aperiodic This section describes information related to measurement resources/settings exchanged between gNBs when CLI measurement between gNBs is aperiodic.

The interfering gNB100 explicitly notifies the interfered gNB100 of information related to measurement resources/settings. The information may include the following. Note that examples of each piece of information listed below may be the same as (3.5.1).

- Frequency information - Time information e.g. SFN, slot number, measurement resource period (e.g. 1/2/5 msec, 1/2/4/8 slots, 1/2/4/7 symbols)
Example: Absolute time may be taken into consideration.
- Subcarrier spacing - Transmission timing offset - Resource ID/beam information - Number of measurements Example: 1/2/4/8 times Example: Interval between measurements may be notified (e.g. 1 (per slot)/2/4/8 slots, 5/10/20/40/80/160/320/640/1280 msec).

The gNB100 receiving interference may notify the gNB100 causing the interference that it wishes to measure the CLI, and the gNB100 causing the interference may notify the gNB100 receiving interference of information related to the measurement resources/settings.

(4) Actions and Effects When SBFD is applied, the gNB100 of the above-described embodiment can improve the utilization efficiency of resources achieved by SBFD by performing CLI measurement in resources that have the same subband and time domain as the reference signal transmitted to the UE200 (or that have at least a partial overlap of the subband and time domain).

When SBFD is applied, the gNB100 of the above-mentioned embodiment can improve the resource utilization efficiency achieved by SBFD by performing CLI measurements on resources that are in a different subband and have the same time domain (or at least a part of the time domain overlaps) as the reference signal transmitted to the UE200.

When SBFD is applied, the gNB100 of the above-mentioned embodiment can improve the resource utilization efficiency achieved by SBFD by performing CLI measurements on resources that have the same subband (or at least a portion of the subband overlaps) as the reference signal transmitted to the UE200 but have a different time domain.

　Information related to CLI measurement resources may be shared in advance with other gNB100. This can improve the efficiency of resource usage.

　Information regarding CLI measurement resources may be exchanged between other gNBs 100. This allows for flexible selection of reference signals for measuring CLI.

The gNB100 in the above-described embodiment may transmit information related to the CLI measurement resource to the UE200. This makes it possible to avoid UL transmission from the UE200 in the UL resource when the CLI measurement resource exists in the UL resource of the SBFD slot.

The gNB100 in the above-described embodiment can transmit information related to appropriate measurement resources/settings depending on the period of the CLI measurement.

(5) Other Embodiments The contents of the present invention have been described above in accordance with the embodiments. However, the present invention is not limited to these descriptions, and it will be obvious to those skilled in the art that various modifications and improvements are possible.

In the above disclosure, the CLI is measured based on a reference signal from another gNB100, but this is not limited to the above. For example, the CLI may be measured based on a data channel or a control channel from another gNB100. Strictly speaking, values such as the signal strength of these channels are measured, and the occurrence of CLI is predicted when the measured value falls below a predetermined threshold. The data channel is, for example, a PDSCH, and the control channel is, for example, a PDCCH. In this case, the setting of the reference signal, the exchange of information related to the CLI measurement resource, and the instruction to the terminal may be the same as or different from the above-mentioned (3.1) Operation Example 1 (3.1.2) (3.1.2.1) Setting of the reference signal, (3.1.2.2) Exchange of information related to the CLI measurement resource, and (3.1.2.3) Instruction to the terminal when a non-common reference signal is used between base stations. In addition, the concept of including the reference signal, the data channel, and the control channel may be referred to as a radio signal or simply a signal.

In the above disclosure, the DL and UL allocation in the SBFD slot is an example and may be reversed.

In the above disclosure, the time domain unit to which SBFD is applied is a slot, but other time domain units such as symbols, subframes, and frames may also be used.

In the above disclosure, information related to measurement resources/settings may be read as measurement resources/settings, and measurement resources/settings may be read as information related to measurement resources/settings.

In the above disclosure, gNB100 and another gNB100 may be read as interchangeable. In addition, either gNB100 or another gNB100 may refer to the gNB that is interfering. Similarly, either gNB100 or another gNB100 may refer to the gNB that is receiving interference.

The above operational examples may be combined and applied in a composite manner, provided no contradictions arise.

In the above disclosure, configure, activate, update, indicate, enable, specify, and select may be read as interchangeable. Similarly, link, associate, correspond, and map may be read as interchangeable, and allocate, assign, monitor, and map may also be read as interchangeable.

Furthermore, specific, dedicated, UE-specific, and UE-individual may be read as interchangeable. Similarly, common, shared, group-common, UE-common, and UE-shared may be read as interchangeable.

The block diagrams (FIGS. 6 and 7) used to explain the above-mentioned embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or may be realized using two or more devices that are physically or logically separated and connected directly or indirectly (e.g., using wires, wirelessly, etc.) and these multiple devices. The functional blocks may be realized by combining the one device or the multiple devices with software.

Functions include, but are not limited to, judgement, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, regard, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs the transmission function is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on the method of realization for any of these.

Furthermore, the above-mentioned gNB100 and UE200 (the device) may function as a computer that performs processing of the wireless communication method of the present disclosure. FIG. 11 is a diagram showing an example of the hardware configuration of the device. As shown in FIG. 11, the device may be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, and a bus 1007.

In the following explanation, the term "apparatus" can be interpreted as a circuit, device, unit, etc. The hardware configuration of the apparatus may be configured to include one or more of the devices shown in the figure, or may be configured to exclude some of the devices.

Each functional block of the device (see Figures 6 and 7) is realized by any hardware element of the computer device, or a combination of the hardware elements.

Furthermore, each function of the device is realized by loading a specific software (program) onto hardware such as the processor 1001 and memory 1002, causing the processor 1001 to perform calculations, control communications by the communications device 1004, and control at least one of reading and writing data in the memory 1002 and storage 1003.

The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) that includes an interface with peripheral devices, a control unit, an arithmetic unit, registers, etc.

The processor 1001 also reads out programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. The programs used are those that cause a computer to execute at least some of the operations described in the above-mentioned embodiments. Furthermore, the various processes described above may be executed by one processor 1001, or may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may be transmitted from a network via a telecommunications line.

Memory 1002 is a computer-readable recording medium and may be composed of, for example, at least one of Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), Random Access Memory (RAM), etc. Memory 1002 may also be called a register, cache, main memory, etc. Memory 1002 can store a program (program code), software module, etc. capable of executing a method according to one embodiment of the present disclosure.

Storage 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, etc. Storage 1003 may also be referred to as an auxiliary storage device. The above-mentioned recording medium may be, for example, a database, a server, or other suitable medium including at least one of memory 1002 and storage 1003.

The communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, etc.

The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., to realize, for example, at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD).

The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that performs output to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one structure (e.g., a touch panel).

Furthermore, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

Furthermore, the device may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

Furthermore, the notification of information is not limited to the aspects/embodiments described in the present disclosure and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or a combination of these. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

Each aspect/embodiment described in this disclosure may be applied to at least one of systems utilizing Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable systems and next generation systems enhanced therefrom. Multiple systems may also be applied in combination (e.g., a combination of at least one of LTE and LTE-A with 5G).

The processing steps, sequences, flow charts, etc. of each aspect/embodiment described in this disclosure may be reordered unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order and are not limited to the particular order presented.

In this disclosure, certain operations that are described as being performed by a base station may in some cases be performed by its upper node. In a network consisting of one or more network nodes having base stations, it is clear that various operations performed for communication with terminals may be performed by at least one of the base station and other network nodes other than the base station (such as, but not limited to, an MME or S-GW). Although the above example shows a case where there is one other network node other than the base station, it may also be a combination of multiple other network nodes (such as an MME and an S-GW).

Information, signals (information, etc.) can be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). They may be input and output via multiple network nodes.

The input and output information may be stored in a specific location (e.g., memory) or may be managed using a management table. The input and output information may be overwritten, updated, or appended. The output information may be deleted. The input information may be sent to another device.

The determination may be based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., a comparison with a predetermined value).

Each aspect/embodiment described in this disclosure may be used alone, in combination, or switched depending on the execution. In addition, notification of specific information (e.g., notification that "X is the case") is not limited to being done explicitly, but may be done implicitly (e.g., not notifying the specific information).

Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

In addition, software, instructions, information, etc. may be transmitted and received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and/or wireless technologies (such as infrared, microwave, etc.), then at least one of these wired and wireless technologies is included within the definition of a transmission medium.

The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

Note that the terms explained in this disclosure and the terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and the symbol may be a signal (signaling). Also, the signal may be a message. Also, the component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

As used in this disclosure, the terms "system" and "network" are used interchangeably.

In addition, the information, parameters, etc. described in this disclosure may be represented using absolute values, may be represented using relative values from a predetermined value, or may be represented using other corresponding information. For example, a radio resource may be indicated by an index.

The names used for the above-mentioned parameters are not limiting in any respect. Furthermore, the formulas etc. using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting in any respect.

In this disclosure, terms such as "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission/reception point", "cell", "sector", "cell group", "carrier", and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

A base station can accommodate one or more (e.g., three) cells (also called sectors). If a base station accommodates multiple cells, the overall coverage area of the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

The term "cell" or "sector" refers to part or all of the coverage area of a base station and/or a base station subsystem that provides communication services within that coverage.

In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a moving object, or the moving object itself, etc. The moving object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may include a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

Furthermore, the base station in the present disclosure may be interpreted as a mobile station (user terminal, the same applies below). For example, each aspect/embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a mobile station is replaced with communication between multiple mobile stations (which may be called, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.). In this case, the mobile station may be configured to have the functions of a base station. Furthermore, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to communication between terminals (for example, "side"). For example, the uplink channel, downlink channel, etc. may be interpreted as a side channel.

Similarly, the mobile station in this disclosure may be interpreted as a base station. In this case, the base station may be configured to have the functions of the mobile station.

A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe.

A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

Numerology may be a communication parameter that applies to at least one of the transmission and reception of a signal or channel. Numerology may indicate, for example, at least one of the following: Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, a particular filtering operation performed by the transceiver in the frequency domain, a particular windowing operation performed by the transceiver in the time domain, etc.

A slot may consist of one or more symbols in the time domain (e.g., Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.). A slot may be a numerology-based unit of time.

A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

Radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals. Radio frame, subframe, slot, minislot, and symbol may each be referred to by a different name that corresponds to the radio frame, subframe, slot, minislot, and symbol.

For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. In other words, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Note that the unit expressing the TTI may be called a slot, minislot, etc., instead of a subframe.

Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station schedules each user terminal by allocating radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) in TTI units. Note that the definition of TTI is not limited to this.

The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

In addition, when one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit of scheduling. In addition, the number of slots (minislots) that constitute the minimum time unit of scheduling may be controlled.

A TTI having a time length of 1 ms may be referred to as a normal TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a normal TTI may be referred to as a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

Note that a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length of 1 ms or more but less than the TTI length of a long TTI.

A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, and may be, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

Furthermore, the time domain of an RB may include one or more symbols and may be one slot, one minislot, one subframe, or one TTI in length. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

In addition, one or more RBs may also be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

Furthermore, a resource block may be composed of one or more resource elements (RE). For example, one RE may be a radio resource area of one subcarrier and one symbol.

A Bandwidth Part (BWP), which may also be referred to as a partial bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by an index of the RB relative to a common reference point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

The BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). One or more BWPs may be configured for a UE within one carrier.

At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal/channel outside the active BWP. Note that "cell," "carrier," etc. in this disclosure may be read as "BWP."

The above-mentioned structures of radio frames, subframes, slots, minislots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, as well as the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using at least one of one or more wires, cables, and printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

The reference signal may also be abbreviated as Reference Signal (RS) or referred to as a pilot depending on the applicable standard.

As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

Any reference to an element using a designation such as "first," "second," etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed therein or that the first element must precede the second element in some way.

When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Additionally, the term "or," as used in this disclosure, is not intended to be an exclusive or.

In this disclosure, where articles have been added through translation, such as a, an, and the in English, this disclosure may include that the noun following these articles is in the plural form.

As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., searching in a table, database, or other data structure), ascertaining something that is deemed to be a "judging" or "determining," and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Additionally, "judgment" and "decision" can include considering resolving, selecting, choosing, establishing, comparing, etc., to have been "judged" or "decided." In other words, "judgment" and "decision" can include considering some action to have been "judged" or "decided." Additionally, "judgment" can be interpreted as "assuming," "expecting," "considering," etc.

In this disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "combined" may also be interpreted in the same way as "different."

FIG. 12 shows an example of the configuration of a vehicle 2001. As shown in FIG. 12, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021-2029, an information service unit 2012, and a communication module 2013.

The drive unit 2002 is composed of, for example, an engine, a motor, or a hybrid of an engine and a motor.

The steering unit 2003 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel operated by the user.

The electronic control unit 2010 is composed of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals are input to the electronic control unit 2010 from various sensors 2021 to 2027 provided in the vehicle. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

Signals from the various sensors 2021 to 2028 include a current signal from a current sensor 2021 that senses the current of the motor, a rotation speed signal of the front and rear wheels acquired by a rotation speed sensor 2022, an air pressure signal of the front and rear wheels acquired by an air pressure sensor 2023, a vehicle speed signal acquired by a vehicle speed sensor 2024, an acceleration signal acquired by an acceleration sensor 2025, an accelerator pedal depression amount signal acquired by an accelerator pedal sensor 2029, a brake pedal depression amount signal acquired by a brake pedal sensor 2026, a shift lever operation signal acquired by a shift lever sensor 2027, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. acquired by an object detection sensor 2028.

The information service unit 2012 is composed of various devices, such as a car navigation system, an audio system, speakers, a television, and a radio, for providing various types of information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 2012 uses information acquired from external devices via the communication module 2013, etc., to provide various types of multimedia information and multimedia services to the occupants of the vehicle 1.

The driving assistance system unit 2030 is composed of various devices that provide functions for preventing accidents and reducing the driving burden on the driver, such as a millimeter wave radar, LiDAR (Light Detection and Ranging), a camera, a positioning locator (e.g., GNSS, etc.), map information (e.g., high definition (HD) map, autonomous vehicle (AV) map, etc.), a gyro system (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chip, and an AI processor, as well as one or more ECUs that control these devices. The driving assistance system unit 2030 also transmits and receives various information via the communication module 2013 to realize driving assistance functions or autonomous driving functions.

The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 1 via the communication port. For example, the communication module 2013 transmits and receives data via the communication port 2033 between the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, axle 2009, microprocessor 2031 and memory (ROM, RAM) 2032 in electronic control unit 2010, and sensors 2021 to 2028, which are provided on the vehicle 2001.

The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station, a mobile station, etc.

The communication module 2013 transmits a current signal from the current sensor input to the electronic control unit 2010 to an external device via wireless communication. The communication module 2013 also transmits to an external device via wireless communication the following signals input to the electronic control unit 2010: a front wheel or rear wheel rotation speed signal acquired by a rotation speed sensor 2022, a front wheel or rear wheel air pressure signal acquired by an air pressure sensor 2023, a vehicle speed signal acquired by a vehicle speed sensor 2024, an acceleration signal acquired by an acceleration sensor 2025, an accelerator pedal depression amount signal acquired by an accelerator pedal sensor 2029, a brake pedal depression amount signal acquired by a brake pedal sensor 2026, a shift lever operation signal acquired by a shift lever sensor 2027, and a detection signal for detecting an obstacle, a vehicle, a pedestrian, etc. acquired by an object detection sensor 2028.

The communication module 2013 receives various information (traffic information, signal information, vehicle distance information, etc.) transmitted from an external device, and displays it on the information service unit 2012 provided in the vehicle. The communication module 2013 also stores the various information received from the external device in a memory 2032 that can be used by the microprocessor 2031. Based on the information stored in the memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, axles 2009, sensors 2021-2028, and the like provided in the vehicle 2001.

　Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure.

(Additional Note)
The above disclosure may be expressed as follows:

The first feature is a base station that, in a duplexing method that can utilize multiple subbands that make up a time division duplexing band, includes a transmitter that transmits information related to measurement resources/settings for measuring crosslink interference to other base stations, and a controller that selects the information based on the period at which the other base stations measure the crosslink interference.

10 Wireless Communication Systems 20 NG-RAN
100 gNB
110 Radio signal transmitting/receiving unit 120 Amplifying unit 130 Modulation/demodulation unit 140 Control signal/reference signal processing unit 150 Encoding/decoding unit 160 Data transmitting/receiving unit 170 Control unit 200 UE
210 wireless signal transmitting/receiving unit 220 control unit 1001 processor 1002 memory 1003 storage 1004 communication device 1005 input device 1006 output device 1007 bus 2001 vehicle 2002 drive unit 2003 steering unit 2004 accelerator pedal 2005 brake pedal 2006 shift lever 2007 left and right front wheels 2008 left and right rear wheels 2009 axle 2010 electronic control unit 2012 information service unit 2013 communication module 2021 current sensor 2022 rotation speed sensor 2023 air pressure sensor 2024 vehicle speed sensor 2025 acceleration sensor 2026 brake pedal sensor 2027 shift lever sensor 2028 object detection sensor 2029 accelerator pedal sensor 2030 Driving assistance system section 2031 Microprocessor 2032 Memory (ROM, RAM)
2033 communication port

Claims (1)

1. A transmission unit that transmits information related to measurement resources/settings for measuring crosslink interference to other base stations in a duplexing method that can use a plurality of subbands constituting a time division duplexing band;
   A control unit that selects the information based on a period during which the other base station measures the crosslink interference;
   A base station comprising:
   

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