Repeater, base station, wireless system, and communication method

Abstract

This repeater comprises: a reception unit that receives beams from a base station; and a control unit that determines a terminal-oriented beam on the basis of beam information of the repeater included in a received beam and associated with each of the beams from the repeater.

Description

Repeater, base station, and communication method

[0001] The present disclosure relates to a repeater, a base station, and a communication method.

[0002] Long Term Evolution (LTE) has been specified for Universal Mobile Telecommunication System (UMTS) networks to achieve higher data rates and lower latency. Furthermore, successor systems to LTE are also being considered to achieve even greater bandwidth and speed than LTE. Examples of successor systems to LTE include LTE-Advanced (LTE-A), Future Radio Access (FRA), 5th generation mobile communication system (5G), 5G plus (5G+), Radio Access Technology (New-RAT), and New Radio (NR).

[0003] In 3GPP Rel-18, a study item (SI) on network-controlled repeaters was established (see, for example, Non-Patent Document 1). It was decided that network-controlled repeaters, which differ from conventional amplify-and-forward repeaters, will be studied for beam control, timing control, and power ON / OFF control in downlink-uplink (DL-UL).

[0004] The network-controlled repeater may also be referred to as an NR network-controlled repeater or a smart repeater. Hereinafter, the network-controlled repeater may simply be referred to as a repeater.

[0005] 3GPP TSG RAN Meeting #94e,RP-213700,Electronic Meeting, Dec.6-17,2021

[0006] However, there has been insufficient consideration of how to control the repeater beam.

[0007] One aspect of the present disclosure is to provide a repeater, a base station, and a communication method that appropriately control the repeater's beam.

[0008] A repeater according to one aspect of the present disclosure has a receiving unit that receives beams from a base station, and a control unit that determines a beam for a terminal based on beam information of the repeater that is included in the received beams and associated with each of the repeater's beams.

[0009] A communication method according to one aspect of the present disclosure is a repeater communication method that receives beams from a base station and determines beams for a terminal based on beam information for the repeater that is included in the received beams and associated with each of the repeater's beams.

[0010] A base station according to one aspect of the present disclosure has a control unit that includes beam information of the repeater associated with each beam of the repeater in a beam of the base station, and a transmitting unit that transmits the beam to the repeater.

[0011] A communication method according to one aspect of the present disclosure is a communication method for a base station, in which beam information of the repeater associated with each beam of the repeater is included in the beam of the base station, and the beam is transmitted to the repeater.

[0012] 1 is a diagram illustrating an example of a wireless communication system according to an embodiment. 2 is a diagram illustrating an example of a frequency range used in the wireless communication system. 3 is a diagram illustrating an example of the configuration of a wireless frame, a subframe, and a slot used in the wireless communication system. 4 is a diagram illustrating an example of Proposal 1-Type 1. 5 is a diagram illustrating an example of Proposal 1-Type 2. 6 is a diagram illustrating an example of Proposal 2-Option 1. 7 is a diagram illustrating an example of Proposal 2-Option 2. 8 is a diagram illustrating an example of Proposal 2-Option 3. 9 is a diagram illustrating an example of Proposal 2-Option 4. 10 is a diagram illustrating an example of Proposal 3-Option 1. 11 is a diagram illustrating another example of Proposal 3-Option 2. 12 is a diagram illustrating an example of Proposal 3-Option 3. 13 is a diagram illustrating another example of Proposal 3-Option 4. 14 is a diagram illustrating the unified TCI state indication (DCI) of Rel-17. 15 is a diagram illustrating an example of Proposal 5-Option 1. 16 is a diagram illustrating another example of Proposal 5-Option 1. 17 is a diagram illustrating an example of Proposal 5-Option 2. 18 is a diagram illustrating an example of Proposal 5-Option 3. 19 is a diagram illustrating an example of Proposal 5-Option 4. FIG. 10 is a diagram illustrating another example of Proposal 5 - Option 4. FIG. 11 is a diagram illustrating an example of RRC parameters. FIG. 12 is a diagram illustrating an example of Variation 1. FIG. 13 is a diagram illustrating an example of Variation 2. FIG. 14 is a diagram illustrating another example of Variation 2. FIG. 15 is a diagram illustrating an example of the functional configuration of a base station and a repeater according to an embodiment. FIG. 16 is a diagram illustrating an example of the hardware configuration of a base station and a repeater according to an embodiment. FIG. 17 is a diagram illustrating an example of the configuration of a vehicle.

[0013] Hereinafter, an embodiment according to one aspect of the present disclosure will be described with reference to the drawings.

[0014] <System Configuration> Fig. 1 is a diagram showing an example of a wireless communication system 1 according to an embodiment. The wireless communication system 1 is, for example, a wireless communication system conforming to 5G New Radio (NR). The wireless communication system 1 includes a Next Generation-Radio Access Network (NG-RAN) 11, a base station 12, a repeater 13, and a terminal 14.

[0015] The wireless communication system 1 may be a wireless communication system conforming to a scheme called Beyond 5G, 5G Evolution, or 6G. The base station 12 may be referred to as a gNB. The terminal 14 may be referred to as User Equipment (UE).

[0016] The NG-RAN 20 actually includes one or more NG-RAN nodes (or ng-eNBs) and is connected to a 5G-compliant core network (e.g., 5GC, not shown). For example, the NG-RAN 20 includes a base station 12 and is connected to the 5GC. The NG-RAN 20 and the 5GC may be simply referred to as a "network."

[0017] The base station 12 is, for example, a base station conforming to 5G, and performs 5G wireless communication with the terminal 14 via the repeater 13. The base station 12 may support Massive Multiple-Input Multiple-Output (MIMO), which generates a more directional beam BM by controlling radio signals transmitted from multiple antenna elements, Carrier Aggregation (CA), which aggregates multiple component carriers (CCs), and Dual Connectivity (DC), which communicates with the terminal 14 in cooperation with another base station (not shown). The beam may also be referred to as a spatial domain filter.

[0018] The repeater 13 is a network-controlled repeater whose operation is controlled by the network. The repeater 13 has its operation, such as beam control, controlled by the network, and relays communications between the base station 12 and the terminal 14.

[0019] Furthermore, the wireless communication system 1 supports a plurality of frequency ranges (FR).

[0020] Fig. 2 is a diagram showing an example of frequency ranges used in the wireless communication system 1. As shown in Fig. 2, the wireless communication system 1 supports FR1 and FR2. The frequency bands of each FR are, for example, as follows: FR1: 410 MHz to 7.125 GHz FR2: 24.25 GHz to 52.6 GHz

[0021] FR1 may use a sub-carrier spacing (SCS) of 15 kHz, 30 kHz, or 60 kHz, and may use a bandwidth (BW) of 5 to 100 MHz. FR2 is a higher frequency than FR1, and may use an SCS of 60 kHz or 120 kHz (including 240 kHz), and may use a bandwidth (BW) of 50 to 400 MHz.

[0022] Note that SCS may be interpreted as numerology, which is defined in 3GPP TS38.300 and corresponds to one subcarrier spacing in the frequency domain.

[0023] Furthermore, the wireless communication system 1 may support a frequency band higher than the FR2 frequency band. Specifically, the wireless communication system 1 may support a frequency band exceeding 52.6 GHz up to 114.25 GHz. For convenience, such a high frequency band may be referred to as "FR2x." When using a frequency band exceeding 52.6 GHz, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) with a larger SCS may be applied.

[0024] 3 is a diagram showing an example of the configuration of a radio frame, subframe, and slot used in the wireless communication system 1. As shown in FIG. 3, one slot is composed of 14 symbols, and the larger (wider) the SCS, the shorter the symbol period (and slot period). The SCS is not limited to the interval (frequency) shown in FIG. 3. For example, 480 kHz, 960 kHz, etc. may be used as the SCS.

[0025] Furthermore, the number of symbols constituting one slot does not necessarily have to be 14 (for example, 28 or 56 symbols). Furthermore, the number of slots per subframe may differ depending on the SCS.

[0026] The time direction (t) shown in Fig. 3 may be called a time domain, a symbol period, a symbol time, etc. The frequency direction may be called a frequency domain, a resource block, a subcarrier, a bandwidth part (BWP), etc.

[0027] <Analysis> 3GPP has decided to study technologies related to repeaters, such as beam control, timing control, and power ON / OFF control in DL-UL.

[0028] However, 3GPP has only decided to consider these technologies, but has not specifically considered them. For example, in Figure 1, 3GPP has not specifically considered how the downlink transmission beam of repeater 13 is controlled based on the network, such as base station 12.

[0029] In the following, the downlink transmission beam may be referred to as a beam, DL Tx beam, Tx beam, DL beam, etc. Furthermore, transmission at the repeater may be referred to as forwarding. For example, the transmission beam may be referred to as a forwarding beam.

[0030] <Proposal Summary> In this case, we will make the following Proposals 1 to 8 regarding the control of DL Tx beams in repeaters.

[0031] (Proposal 1): The repeater controls the DL Tx beam based on the side control information (SCI). (Proposal 2): ​​The terminal performs measurements using the repeater's DL Tx beam. (Proposal 3): The base station notifies the repeater's DL Tx beam for each time unit using the base station's beam information. (Proposal 4): The base station notifies the repeater's DL Tx beam for each base station's DL RS resource using the base station's beam information. Note that RS stands for Reference Signal. (Proposal 5): The base station notifies the repeater's DL Tx beam for each time unit using the repeater's transmit beam information. (Proposal 6): The base station notifies the repeater's DL Tx beam for each (newly defined) RS resource specified for the repeater's DL Tx beam. (Proposal 7): The base station notifies the repeater's transmit beam using the base station's beam information. (Proposal 8): The repeater utilizes the RS measurement and reporting mechanisms in the terminal.

[0032] The SCI is information sent from the network to the repeater. The SCI is received and processed by the repeater. In other words, the repeater is controlled by the network via the SCI.

[0033] The SCI may be notified from the base station to the repeater by lower layer signaling of L1 / L2, such as SSB (SS / PBCH Block), CSI-RS, PDCCH (DCI), PDSCH, or MAC CE. The SCI may be notified from the base station to the repeater by higher layer signaling, such as RRC parameters. Note that SS stands for Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS). PBCH stands for Physical Broadcast Channel. CSI stands for Channel State Information. RS stands for Reference Signal. PDCCH stands for Physical Downlink Control Channel. DCI stands for Downlink Control Information. PDSCH stands for Physical Downlink Shared Channel. MAC CE stands for Medium Access Control Control Element.

[0034] <Proposal 1> The repeater controls the DL Tx beam based on (using) the SCI.

[0035] The DL Tx beam control in the repeater may have three types: Type 0 to Type 2.

[0036] <Proposal 1 - Type 0> The repeater's DL Tx beam control function is implementation dependent.

[0037] In this case, the repeater should consider enhancing its capability report. For example, the repeater (where DL Tx beam control is implemented) should notify the base station of its DL Tx beam capability. For example, the repeater should report to the base station whether it has the capability for DL ​​Tx beam control, such as the number of DL Tx beams.

[0038] <Proposal 1 - Type 1> In Proposal 1 - Type 1, the base station's beam information is used as SCI. In other words, in Proposal 1 - Type 1, the base station notifies the repeater of beam information such as the base station's beam ID (identifier) ​​to control the DL Tx beam at the repeater.

[0039] The repeater controls (determines) the DL Tx beam based on beam information such as the base station's beam ID notified by the base station. Therefore, the repeater's DL Tx beam is associated with the base station's DL Tx beam. For example, the repeater's DL Tx beam is indicated based on a mapping rule (mapping table) between the base station's DL Tx beam and the repeater's DL Tx beam.

[0040] The repeater refers to the mapping rule to determine the DL Tx beam for transmitting (forwarding) the DL signal received from the base station to the terminal.

[0041] Fig. 4 is a diagram illustrating an example of Proposal 1-Type 1. Fig. 4 shows the base station 12, repeater 13, and terminals 14 (14a to 14d) described in Fig. 1. Fig. 4 also shows mapping rule R21.

[0042] Mapping rule R21 is information that associates the relationship between the DL Tx beam of base station 12 and the DL Tx beam of repeater 13. For example, as shown in Figure 4, mapping rule R21 associates the beam ID "#1" of the DL Tx beam of base station (gNB) 12 with the beam ID "#a" of the DL Tx beam of repeater 13.

[0043] In the following, beam ID "#1" may be simply referred to as beam #1. Similarly, for other beam IDs such as #2 and #a, the "ID" will be omitted (for example, they will be referred to as beam #2 and beam #a).

[0044] An example of the operation of the wireless system in Fig. 4 will be described. In a predetermined process such as initial access, the base station 12 determines (knows) which beam of the repeater 13 the terminal 14 will use to receive the DL signal. For example, the base station 12 determines that the terminal 14a will receive the DL signal via beam #a of the repeater 13. The base station 12 determines that the terminal 14b will receive the DL signal via beam #b of the repeater 13. The base station 12 determines that the terminal 14c will receive the DL signal via beam #c of the repeater 13. The base station 12 determines that the terminal 14d will receive the DL signal via beam #d of the repeater 13.

[0045] Here, for example, the base station 12 schedules DL transmission to the terminal 14a. As described above, the terminal 14a receives a DL signal from the repeater 13 via beam #a. Therefore, the base station 12 refers to the mapping rule R21 and transmits the DL signal to the repeater 13 using beam #1 corresponding to beam #a (by notifying the repeater 13 of beam #1).

[0046] Based on beam #1 of the received DL signal, repeater 13 refers to mapping rule R21 and transmits (forwards) the DL signal transmitted from base station 12 to terminal 14a using beam #a corresponding to beam #1.

[0047] Also, for example, the base station 12 schedules DL transmission to the terminal 14b. As described above, the terminal 14b receives a DL signal from the repeater 13 via beam #b. Therefore, the base station 12 refers to the mapping rule R21 and transmits the DL signal to the repeater 13 using beam #2 corresponding to beam #b.

[0048] Based on beam #2 of the received DL signal, repeater 13 refers to mapping rule R21 and transmits (forwards) the DL signal transmitted from base station 12 to terminal 14a using beam #b corresponding to beam #2.

[0049] As explained above with reference to Fig. 4, the repeater controls the DL Tx beam by referring to the mapping rule based on the beam information such as the beam ID of the base station notified by the base station. Therefore, the repeater can appropriately control the beam of the DL signal transmitted to the terminal.

[0050] <Proposal 1 - Type 1 - Other 1> The repeater may report the number of DL Tx beams as the repeater's capability to the base station. The base station may notify the repeater of the beam ID based on the repeater's capability notified by the repeater.

[0051] <Proposal 1 - Type 1 - Other 2> The mapping rule may be pre-installed in the repeater (for example, stored in a storage device), or may be notified to the repeater from the base station using the SCI.

[0052] <Proposal 1 - Type 1 - Other 3> The mapping rule may be reported from the repeater to the base station. For example, the repeater may associate the repeater's beam (information) with the base station's beam (information) and report the associated mapping rule to the base station.

[0053] <Proposal 1 - Type 1 - Other 4> In the mapping rule, the beam information of the base station and the beam information of the repeater are associated with each other, but this is not limited to this. The beam information of the repeater in the mapping rule may be associated with the DL RS resource ID of the base station. For example, the beam information such as the beam ID of the repeater may be associated with the SSB / CSI-RS resource ID of the base station. Furthermore, the beam information such as the beam ID of the repeater may be associated with the Transmission Configuration Indication (TCI) state ID of the base station.

[0054] The TCI state is information regarding quasi-co-location (QCL) of at least one of a signal and a channel (hereinafter referred to as a signal / channel), and may also be called a spatial reception parameter, spatial relation information, etc. The TCI state may be set in a terminal for each channel or for each signal.

[0055] The TCI state may be, for example, information about the QCL between the target channel (or RS for the channel) and another signal (e.g., another Downlink Reference Signal (DL-RS)). The TCI state may be set (indicated) by higher layer signaling, physical layer signaling, or a combination thereof.

[0056] A QCL is an index indicating the statistical properties of a signal / channel. For example, if a signal / channel has a QCL relationship with another signal / channel, it may mean that it can be assumed that at least one of a Doppler shift, a Doppler spread, an average delay, a delay spread, and a spatial parameter (e.g., a spatial Rx parameter) is the same between these different signals / channels (i.e., they are QCLs with respect to at least one of these).

[0057] In NR, it is considered to control the reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) of a signal / channel based on the TCI state. A terminal may determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) of the signal / channel based on the TCI state or QCL assumption of the signal / channel.

[0058] <Proposal 1 - Type 1 - Other 5> The base station may use the SCI to indicate the time unit of the DL Tx beam of the base station. In other words, the repeater may receive from the base station the time unit of the DL Tx beam of the base station using the SCI. The time unit may be a subframe, a slot, a minislot, a symbol, multiple subframes, multiple slots, or multiple symbols.

[0059] <Proposal 1 - Type 1 - Other 6> The DL Tx beam of the repeater in a time unit may be determined based on the DL Tx beam of the base station and a mapping rule. For example, the mapping rule is mapping rule R21 shown in Figure 4. Suppose the DL Tx beam of the base station in a certain slot (time unit) is beam #2. In this case, the DL Tx beam of the repeater in a certain slot (time unit) is beam #b.

[0060] <Proposal 1 - Type 1 - Other 7> In the mapping rule, different DL Tx beams of the base station correspond to different DL Tx beams of the repeater. The DL Tx beam ID of the base station used in the mapping rule may be the same as the DL Tx beam ID of the base station, or may be different (or may be defined separately). Whether the DL Tx beam ID of the base station used in the mapping rule is the same as or different from the DL Tx beam ID of the base station may depend on the implementation of the base station.

[0061] <Proposal 1 - Type 1 - Other 8> The beam of a repeater may depend on the implementation of the repeater. For example, if the same beam ID is notified from the base station in two time units, the repeater may apply the same beam (direction). If different beam IDs are notified from the base station in two time units, the repeater may apply different beams (directions).

[0062] <Proposal 1 - Type 1 - Other 9> Beam control at the repeater may be applied to DL channels such as SSB, SCI-RS, PDCCH, PDSCH, and DMRS, where DMRS stands for Demodulation Reference Signal.

[0063] <Proposal 1 - Type 2> In Proposal 1 - Type 2, the repeater's beam information is used as SCI. In other words, in Proposal 1 - Type 2, beam information such as the repeater's beam ID is notified from the base station to the repeater to control the DL Tx beam at the repeater.

[0064] The repeater controls (determines) the DL Tx beam based on beam information such as the repeater's beam ID notified by the base station. Therefore, Proposal 1-Type 2 does not require the mapping rule described in Proposal 1-Type 1.

[0065] Fig. 5 is a diagram illustrating an example of Proposal 1-Type 2. Fig. 5 shows the base station 12, repeater 13, and terminals 14 (14a to 14d) described in Fig. 4.

[0066] 4 , in a predetermined process such as initial access, the base station 12 determines (knows) which beam of the repeater 13 the terminal 14 will use to receive the DL signal. For example, the base station 12 determines that the terminal 14a will receive the DL signal via beam #a of the repeater 13. The base station 12 determines that the terminal 14b will receive the DL signal via beam #b of the repeater 13. The base station 12 determines that the terminal 14c will receive the DL signal via beam #c of the repeater 13. The base station 12 determines that the terminal 14d will receive the DL signal via beam #d of the repeater 13.

[0067] The base station 12 communicates with the repeater 13 (transmits a DL signal) using one of the beams #1 to #4 of the base station 12. For example, as shown in Figure 4, the base station 12 communicates with the repeater 13 using beam #2, which has the best communication quality, of the beams #1 to #4 of the base station 12.

[0068] Here, for example, the base station 12 schedules DL transmission to the terminal 14a. As described above, the terminal 14a receives a DL signal via beam #a from the repeater 13. Therefore, when the base station 12 transmits a DL signal to the terminal 14a via the repeater 13, it notifies the repeater 13 of beam #a using the SCI.

[0069] The repeater 13 uses the beam #a notified by the base station 12 to transmit the DL signal received from the base station 12 to the terminal 14a.

[0070] Also, for example, the base station 12 schedules DL transmission to the terminal 14b. As described above, the terminal 14b receives a DL signal via beam #b from the repeater 13. Therefore, when the base station 12 transmits a DL signal to the terminal 14b via the repeater 13, the base station 12 notifies the repeater 13 of beam #b using the SCI.

[0071] The repeater 13 uses the beam #b notified by the base station 12 to transmit the DL signal received from the base station 12 to the terminal 14b.

[0072] As explained above with reference to Fig. 5, the repeater controls the DL Tx beam based on beam information such as the repeater's beam ID notified from the base station. Therefore, the repeater does not need to store information such as mapping rules in a storage device, which reduces costs.

[0073] <Proposal 1 - Type 2 - Other 1> The repeater may report the number of DL Tx beams as the repeater's capability to the base station. The base station may notify the repeater of the beam ID based on the repeater's capability notified by the repeater.

[0074] <Proposal 1 - Type 2 - Other 2> The base station may use the SCI to indicate the time unit of the DL Tx beam of the repeater. In other words, the repeater may receive instructions from the base station about the time unit of the DL Tx beam of the repeater using the SCI.

[0075] <Proposal 1 - Type 2 - Other 3> The DL Tx beam of the repeater in a time unit may be determined directly based on the DL Tx beam of the repeater instructed by the base station. In other words, the repeater may determine the DL Tx beam in a time unit based on instructions from the base station.

[0076] <Proposal 1 - Type 2 - Other 4>

[0077] The beam of a repeater may depend on the implementation of the repeater. For example, if the same beam ID is notified by the base station in two time units, the repeater may apply the same beam (direction). If different beam IDs are notified by the base station in two time units, the repeater may apply different beams (directions).

[0078] <Proposal 1 - Type 2 - Other 5> Beam control at the repeater may be applied to DL channels such as SSB, SCI-RS, PDCCH, PDSCH, and DMRS.

[0079] <Proposal 2> The terminal performs measurements based on the DL Tx beam of the repeater. The terminal notifies the base station of the measurement results. This operation allows the base station to determine (understand) the quality of the DL Tx beam of the repeater at the terminal.

[0080] Note that measurement refers to, for example, a terminal receiving a detection / measurement signal (e.g., PSS, SSS, Cell-specific Reference Signal (CRS), CSI-RS, etc.), finding the detection / measurement signal, and measuring its reception quality. Examples of reception quality include Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), and Signal to Interference plus Noise Ratio (SINR). The measurement result may be referred to as a measurement report, or simply as a report.

[0081] Proposal 2 may have the following options 1-5:

[0082] In Options 1 and 2, measurements are assumed to be performed in the same manner as in Proposal 1. For example, the base station uses its own beam information to instruct the repeater to select a DL Tx beam. The base station transmits an RS for each time unit or RS resource configured in Options 1 and 2 below, and determines which RS the terminal measured based on the report from the terminal.

[0083] (Option 1): The base station directs the repeater beam for each time unit (see also Proposal 3). (Option 2): The base station directs the repeater beam for each DL RS resource of the base station (see also Proposal 4).

[0084] In options 3 to 5, the measurement assumes the Type 2 operation described in Proposal 1. For example, the base station uses the repeater's different beam information to instruct the repeater to use the DL Tx beam. The base station transmits an RS for each time unit or DL ​​RS resource configured in options 3 to 5 below, and determines which RS the terminal measured based on the report from the terminal.

[0085] (Option 3): The base station directs the repeater beam for each time unit (see also Proposal 5). (Option 4): The base station specifies DL RS resources to control the repeater's DL Tx beam. The base station directs the repeater beam for each DL RS resource using the specified DL RS resources (see also Proposal 6). (Option 5): The base station directs the repeater beam using the base station's beam information (see also Proposal 7).

[0086] <Proposal 2 - Option 1> The base station directs the beam for each time unit in the operation of Proposal 1 - Type 1. The repeater directs the beam for each time unit in the operation of Proposal 1 - Type 1.

[0087] FIG. 6 is a diagram illustrating an example of Proposal 2 - Option 1. "gNB's DL RS resources" in FIG. 6 indicates DL RS resources of the base station (gNB). In the example of FIG. 6, one DL RS resource is allocated to two time units. The DL RS resource configuration of the base station does not need to be notified (instructed) to the repeater. Note that the DL RS resources may be, for example, SSB / CSI-RS resources.

[0088] "gNB's Tx beam" in Figure 6 indicates the DL Tx beam of the base station. The base station transmits, for example, four DL RSs (RS#1 to RS#4) using different DL Tx beams. Each DL RS may be transmitted using multiple time units. For example, RS#1 may be transmitted using two time units as indicated by arrow A1. For example, RS#2 may be transmitted using two time units as indicated by arrow A2.

[0089] As shown in "Beam indication" in Figure 6, the base station notifies the repeater of beam information such as the base station's beam ID for each time unit.

[0090] For example, the base station notifies the repeater of beam #1, which is the beam ID of the base station, in each of the two time units indicated by arrow A1 in Fig. 6. For example, the base station notifies the repeater of beam #2, which is the beam ID of the base station, in each of the two time units indicated by arrow A2 in Fig. 6.

[0091] As explained in Proposal 1 - Type 1, the repeater has a mapping rule. Based on the beam information notified by the base station, the repeater refers to the mapping rule and determines the DL Tx beam to transmit the DL RS.

[0092] For example, the repeater refers to the mapping rule R21 shown in Fig. 4 and determines the repeater's beam #a corresponding to the base station's beam #1 in each of the two time units indicated by the arrow A1 in Fig. 6 (see the beam indicated by the arrow A3 in Fig. 6). For example, the repeater determines the repeater's beam #b corresponding to the base station's beam #2 in each of the two time units indicated by the arrow A2 in Fig. 6 (see the beam indicated by the arrow A4 in Fig. 6).

[0093] The terminal measures the DL RS transmitted from the repeater using a legacy procedure (e.g., an existing procedure). For example, the terminal performs L1 beam measurement in the four DL RS resources shown in Fig. 6. The terminal also performs L1 beam measurement in each of the time units shown in Fig. 6. The terminal reports the L1 beam measurement to the base station via the repeater 13.

[0094] The base station determines (understands) the beam quality (communication quality) between the repeater and the terminal based on the measurement report from the terminal. The base station dynamically executes (determines) the schedule for the terminal (DL) using the good beam of the repeater.

[0095] As described above, the repeater may control the DL Tx beam for each time unit based on the beam information of the base station and transmit the DL RS to the terminal. The terminal may also report the measurement results of the repeater's beam to the base station for each time unit. This allows the repeater to transmit a DL signal to the terminal using a beam with good quality.

[0096] <Proposal 2 - Option 2> The base station directs a beam for each DL RS resource of the base station. The repeater is directed to direct a beam for each DL RS resource of the base station.

[0097] FIG. 7 is a diagram illustrating an example of Proposal 2 - Option 2. "gNB's DL RS resources" in FIG. 7 indicates the DL RS resources of the base station. "gNB's Tx beam" in FIG. 7 indicates the DL Tx beam of the base station. The base station transmits, for example, four DL RSs (RS#1 to RS#4) using different DL Tx beams. The base station notifies the repeater of the DL RS resource configuration.

[0098] For example, as indicated by arrow A5 in FIG. 7, the base station notifies the repeater of beam information such as the beam ID of the base station for each DL RS resource.

[0099] For example, the base station notifies the repeater of beam #1 in the DL RS resource of RS #1 shown in Fig. 7. For example, the base station notifies the repeater of beam #2 in the DL RS resource of RS #2 shown in Fig. 7.

[0100] As explained in Proposal 1 - Type 1, the repeater has a mapping rule. Based on the beam information notified by the base station, the repeater refers to the mapping rule and determines the DL Tx beam for transmitting the DL RS. At this time, the repeater determines the DL Tx beam for each DL RS resource configuration (DL RS resource unit) notified by the base station.

[0101] For example, in the DL RS resource (section) of RS#1 shown in Fig. 7, the repeater refers to mapping rule R21 shown in Fig. 4 and determines the repeater's beam #a corresponding to the base station's beam #1 (see the beam indicated by arrow A6 in Fig. 7). For example, in the DL RS resource of RS#2 shown in Fig. 7, the repeater refers to mapping rule R21 shown in Fig. 4 and determines the repeater's beam #b corresponding to the base station's beam #2 (see the beam indicated by arrow A7 in Fig. 7).

[0102] The terminal measures the DL RS transmitted from the repeater using a legacy procedure. For example, the terminal performs L1 beam measurement in the four DL RS resources #1 to #4 shown in Fig. 7. The terminal reports the L1 beam measurement to the base station via the repeater 13.

[0103] The base station determines (knows) the beam quality (communication quality) between the repeater and the terminal based on the measurement report from the terminal. The base station dynamically schedules the terminal (DL) using the good beam of the repeater. The base station may schedule the terminal for each time unit.

[0104] As described above, the repeater may control the DL Tx beam for each DL RS resource based on the beam information of the base station and transmit the DL RS to the terminal. The terminal may also report measurements of the repeater's beam for each DL RS resource to the base station. This allows the repeater to transmit a DL signal to the terminal using a beam with good quality.

[0105] <Proposal 2 - Option 3> The base station directs the beam for each time unit in the operation of Proposal 1 - Type 2. The repeater directs the beam for each time unit in the operation of Proposal 1 - Type 2.

[0106] Figure 8 is a diagram illustrating an example of Proposal 2 - Option 3. "gNB's DL RS resources" in Figure 8 indicates DL RS resources in the base station. In the example of Figure 8, one DL RS resource is allocated to two time units. The DL RS resource configuration of the base station does not need to be notified to the repeater.

[0107] 8 shows DL Tx beams of a base station. The base station transmits, for example, four DL RSs (RS#1 to RS#4) using one (direction-facing) DL Tx beam among multiple DL Tx beams (see arrow A8 in FIG. 8). For example, the base station may transmit the DL RSs using the DL Tx beam among multiple DL Tx beams that provides the best communication quality between the base station and the repeater.

[0108] As shown in "Beam indication" in Figure 8, the base station notifies the repeater of beam information such as the repeater's beam ID for each time unit.

[0109] For example, the base station notifies the repeater of beam #a, which is the repeater's beam ID, in each of the two time units indicated by arrow A9 in Fig. 8. For example, the base station notifies the repeater of beam #b, which is the repeater's beam ID, in each of the two time units indicated by arrow A10 in Fig. 8.

[0110] As explained in Proposal 1-Type 2, in Proposal 1-Type 2, the base station notifies the repeater of its beam information to control the repeater's DL Tx beam. Therefore, in Proposal 1-Type 2, the repeater does not have a mapping rule. The repeater determines the DL Tx beam to transmit (transmit) the DL RS based on the repeater's beam information notified by the base station.

[0111] For example, the repeater determines a DL Tx beam for transmitting a DL RS, as shown in "Repeater DL Tx beam" in Fig. 8. For example, the repeater determines repeater beam #a in each of the two time units shown by arrow A9 in Fig. 8 (see the beam shown by arrow A11 in Fig. 8). For example, the repeater determines repeater beam #b in each of the two time units shown by arrow A10 in Fig. 8 (see the beam shown by arrow A12 in Fig. 8).

[0112] The terminal measures the DL RS transmitted from the repeater using a legacy procedure. For example, the terminal performs L1 beam measurement in the four DL RS resources shown in Fig. 8. The terminal also performs L1 beam measurement in each of the time units shown in Fig. 8. The terminal reports the L1 beam measurement to the base station via the repeater 13.

[0113] The base station determines (understands) the beam quality (communication quality) between the repeater and the terminal based on the measurement report from the terminal. The base station dynamically schedules the terminal (DL) using the good beam of the repeater.

[0114] As described above, the repeater may control the DL Tx beam for each time unit based on the repeater's beam information and transmit the DL RS to the terminal. The terminal may also report measurements of the repeater's beam to the base station for each time unit. This allows the repeater to transmit a DL signal to the terminal using a beam with good quality.

[0115] The base station may notify multiple beam information of the repeater in one time unit, in which case the repeater may transmit DL signals (simultaneously) using multiple DL Tx beams in one time unit.

[0116] Alternatively, the time unit may be set for each of a plurality of frequency resources (each frequency resource area unit). The base station may notify the repeater of beam information in the time unit of each of the plurality of frequency resources. In this case, the repeater may transmit DL signals simultaneously using multiple DL Tx beams in each of the plurality of frequency resources.

[0117] The above-described setting of time units for each of a plurality of frequency resources may also be applied to other options of Proposal 2. The above-described setting of time units for each of a plurality of frequency resources may also be applied to proposals other than Proposal 2.

[0118] <Proposal 2 - Option 4> Proposal 2 - Option 4 newly defines RS resources for controlling the DL Tx beam of a repeater. The newly defined DL RS resources of a repeater may be referred to as repeater DL RS resources. The repeater DL RS resources can be considered as being defined to manage the DL Tx beam of a repeater.

[0119] Figure 9 is a diagram illustrating an example of Proposal 2 - Option 4. "gNB's DL RS resources" shown in Figure 9 indicates DL RS resources in the base station. The DL RS resources (configuration) in the base station do not need to be notified to the repeater.

[0120] 9 indicates repeater DL RS resources for a repeater. The repeater DL RS resources include beam information of the repeater for controlling the DL Tx beam of the repeater.

[0121] The "Beam indication" shown in Figure 9 indicates beam information for controlling the DL Tx beam of the repeater. The beam information for controlling the DL Tx beam of the repeater is determined for each repeater DL RS resource. The repeater DL RS resource (configuration) is notified to the repeater from the base station.

[0122] The base station configures repeater DL RS resources and transmits a repeater DL RS including beam information of the repeater's DL Tx beam for each repeater DL RS resource. The base station transmits, for example, four repeater DL RSs (RS#a to RS#d) using one DL Tx beam among the multiple DL Tx beams. For example, the base station may transmit the repeater DL RS using the DL Tx beam among the multiple DL Tx beams that provides the best communication quality between the base station and the repeater.

[0123] The repeater that receives the repeater DL RS decodes the repeater DL RS and acquires the repeater's beam information. Based on the decoded beam information, the repeater controls the DL Tx beam as shown in "Repeater DL Tx beam" in Figure 9.

[0124] Each repeater DL RS resource occupies a specific time domain resource designated by the base station, and the repeater amplifies and forwards the DL RS of the base station to the terminal in each repeater DL RS resource.

[0125] The terminal measures the DL RS transmitted from the repeater using a legacy procedure. For example, the terminal performs L1 beam measurement in the four repeater DL RS resources shown in Figure 9. The terminal reports the L1 beam measurement to the base station via the repeater 13.

[0126] The base station determines (knows) the beam quality (communication quality) between the repeater and the terminal based on the measurement report from the terminal. The base station dynamically schedules the terminal (DL) using the good beam of the repeater. The base station may schedule the terminal for each time unit.

[0127] As described above, the repeater may control the DL Tx beam for each repeater DL RS resource and transmit the DL RS to the terminal. The terminal may report measurements of the repeater's beam for each repeater DL RS resource to the base station. This allows the repeater to transmit a DL signal to the terminal using a beam with good quality.

[0128] In the above Proposal 2 - Option 4, it is stated that the beam information of the repeater may be determined for each repeater DL RS resource, but this is not limited to this. The beam information of the repeater may be specified for each repeater DL RS resource. Furthermore, the DL Tx beam of the repeater may be determined for each repeater DL RS resource or specified for each repeater DL RS resource.

[0129] <Proposal 2 - Option 5> In the operation of Proposal 1 - Type 2, the base station uses the base station's beam information to instruct the repeater's beam. The repeater determines the DL Tx beam using the base station's beam information without using a mapping rule. The repeater's beam is determined for each DL RS resource of the base station.

[0130] Fig. 10 is a diagram illustrating an example of Proposal 2 - Option 5. "gNB's DL RS resources" shown in Fig. 10 indicates DL RS resources in the base station.

[0131] The base station transmits, for example, four DL RSs (RS#1 to RS#4) using one DL Tx beam among multiple DL Tx beams. For example, the base station may transmit the DL RSs using the DL Tx beam among multiple DL Tx beams that provides the best communication quality between the base station and the repeater.

[0132] The base station notifies the repeater of the beam information of the base station in the DL RS of the DL RS resource. For example, as shown in "Beam indication" in Figure 10, the base station may notify the repeater of the beam information of the base station in the DL RS of the DL RS resource.

[0133] The repeater controls the DL Tx beam based on the beam information notified from the base station. For example, the repeater controls the DL Tx beam as shown in "Repeater DL Tx beam" in Figure 10. In other words, the repeater controls the DL Tx beam using the beam information of the base station.

[0134] The terminal measures the DL RS transmitted from the repeater using a legacy procedure. For example, the terminal performs L1 beam measurement in the four DL RS resources shown in Fig. 10. The terminal reports the L1 beam measurement to the base station via the repeater 13.

[0135] The base station determines (knows) the beam quality (communication quality) between the repeater and the terminal based on the measurement report from the terminal. The base station dynamically schedules the terminal (DL) using the good beam of the repeater. The base station may schedule the terminal for each time unit.

[0136] As described above, the repeater may control the DL Tx beam for each DL RS resource of the base station using the base station's beam information notified by the base station, and transmit the DL RS to the terminal. The terminal may also report measurements of the repeater's beam for each DL RS resource to the base station. This allows the repeater to transmit a DL signal to the terminal using a high-quality beam.

[0137] <Repeater Capabilities in Proposals 1 and 2> A repeater can transmit a repeater capability indicating its capabilities to a network such as an NG-RAN. The repeater may transmit the repeater capability in response to receiving a Repeater Capability Enquiry from the network.

[0138] The Repeater capability indicating the repeater capability may include the following information indicating the repeater capability: Note that the information indicating the repeater capability may correspond to information defining the repeater capability.

[0139] - Information on the number of DL Tx beams that the repeater can handle - Information indicating whether the repeater supports any of the Type 0, Type 1, and Type 2 frameworks described in Proposal 1 - Information indicating whether the repeater can transmit DL signals simultaneously using multiple DL Tx beams In this case, the number of DL Tx beams that the repeater can use to simultaneously transmit DL signals may be defined as the repeater capability. - Information indicating whether the repeater can simultaneously transmit DL signals in different beams for resources in different frequency domains In this case, the number of DL Tx beams that the repeater can use to simultaneously transmit DL signals may be defined as the repeater capability.

[0140] <Proposal 3> Proposal 3 assumes the operation of Type 1 described in Proposal 1. The base station notifies the repeater's DL Tx beam for each time unit using the base station's beam information. Proposal 3 may have the following options 1 to 8.

[0141] (Option 1): The base station notifies multiple consecutive base station beam information (e.g., base station beam ID). (Option 2): The base station notifies one base station beam information. The repeater sets the same beam information consecutively. (Option 3): The base station sets multiple consecutive base station beam information periodically. (Option 4): The base station notifies one base station beam information. The repeater sets the same beam information consecutively and periodically. (Option 5): The base station uses the existing beam setting (method) for the terminal. The repeater decodes the signal for the terminal. (Option 6): The repeater refers to the TCI status of DCI 1_x (x is a positive integer, for example, 0 or 1). The repeater decodes the DCI for the terminal. (Option 7): The TCI status of the configuration / activation of Semi Persistent Scheduling (SPS) is used. Or, the TCI status of the configuration / activation of SPS is specified for the repeater. (Option 8): The base station uses the TCI state of Rel-17 to notify base station beam information.

[0142] <Proposal 3 - Option 1> The base station notifies the repeater of multiple consecutive base station beam information. The repeater controls the DL Tx beam based on the multiple consecutive base station beam information.

[0143] Figure 11 is a diagram illustrating an example of Proposal 3 - Option 1. "Beam indication" in Figure 11 indicates beam information that the base station notifies the repeater. The beam information is, for example, the beam ID of the base station.

[0144] As shown in Figure 11, a series of beam information from the base station is applied in a series of time units. The base station notifies different beam information for each time unit. For example, the base station notifies beam #1 in the time unit indicated by arrow A13 in Figure 11. For example, the base station notifies beam #2 in the time unit indicated by arrow A14 in Figure 11.

[0145] FIG. 12 is a diagram illustrating another example of Proposal 3 - Option 1. In FIG. 12, the length of the time unit is different from that in FIG. 11. The time units shown in FIG. 11 have a constant length, but the time units in FIG. 12 do not have a constant length. Note that, similar to the explanation of FIG. 11, the base station notifies different beam information for each time unit in FIG. 12 as well.

[0146] The sequence of time units over which beam control is applied may be indicated to the repeater as a number of consecutive time units. The sequence of time units over which beam control is applied may be indicated based on the start time and length of the time units.

[0147] The start time or length of time of the time unit for which beam control is applied may be predefined, for example, the time unit for which beam control is applied may start at a predefined offset from the reception of the beam information and span a predefined length.

[0148] Furthermore, the sequence of time units to which beam control is applied may be notified to the repeater using a sequence of time unit IDs. The beam information of the base station may be associated with the time units. For example, the beam ID of the base station may be associated with the time unit ID.

[0149] <Proposal 3 - Option 2> The base station notifies the repeater of one base station beam information. The repeater continuously sets the notified one beam information. In other words, the repeater continuously uses the DL Tx beam based on the notified one beam information.

[0150] Figure 13 is a diagram illustrating an example of Proposal 3 - Option 2. "Beam indication" in Figure 13 indicates beam information that the base station notifies the repeater. The beam information is, for example, the beam ID of the base station.

[0151] 13, the base station notifies the repeater of its beam information in a certain time unit. For example, the base station notifies the repeater of beam #1 in a certain time unit.

[0152] The repeater continuously uses a DL Tx beam based on one piece of notified beam information. For example, the repeater uses a DL Tx beam based on one piece of notified beam information over multiple time units. In the example of Figure 13, the repeater uses a DL Tx beam based on the base station's beam ID "#1" over multiple time units.

[0153] The sequence of time units over which beam control is applied may be indicated to the repeater as a number of consecutive time units. The sequence of time units over which beam control is applied may be indicated based on the start time and length of the time units.

[0154] The start time or length of time of the time unit for which beam control is applied may be predefined, for example, the time unit for which beam control is applied may start at a predefined offset from the reception of the beam information and span a predefined length.

[0155] Furthermore, the sequence of time units to which beam control is applied may be indicated to the repeater using a sequence of time unit IDs. The beam information of the base station may be associated with the time units. For example, the beam information of the base station may be associated with the time unit IDs. In this case, the base station can notify the repeater of the sequence of time units to which beam control is applied by notifying the repeater of the beam information of the base station.

[0156] <Proposal 3 - Option 3> The base station periodically sets multiple consecutive base station beam information. The repeater periodically controls the DL Tx beam based on multiple consecutive base station beam information notified by the base station.

[0157] Fig. 14 is a diagram illustrating an example of Proposal 3 - Option 3. "Beam indication" in Fig. 14 indicates beam information that the base station notifies the repeater. The beam information is, for example, the beam ID of the base station.

[0158] The base station notifies the repeater of its beam information in one period. For example, as shown in Fig. 14, the base station notifies the repeater of the beam IDs "#1, #2, #3, #4" of the base station once using all the time units (four time units) in one period.

[0159] When the repeater receives the base station's beam IDs "#1, #2, #3, #4" in one cycle, it periodically transmits DL Tx beams corresponding to each of the base station's beam IDs "#1, #2, #3, #4." For example, the repeater refers to the mapping rule and repeatedly (periodically) transmits beam IDs "#a, #b, #c, #d" corresponding to the base station's beam IDs "#1, #2, #3, #4."

[0160] The base station may notify the repeater of the periodic pattern of the base station's beam information.

[0161] The base station may notify the repeater of the period and offset of the base station's beam information. The offset may indicate, for example, the time unit at which the periodic DL Tx beam transmission begins. The sequence of the base station's beam information may be indicated by each beam information (e.g., "#1, #2, #3, #4") that applies to a time unit in one period.

[0162] <Proposal 3 - Option 4> The base station notifies one base station beam information. The repeater sets the same beam information continuously and periodically.

[0163] Figure 15 is a diagram illustrating an example of Proposal 3 - Option 4. "Beam indication" in Figure 15 indicates beam information that the base station notifies the repeater. The beam information is, for example, the beam ID of the base station.

[0164] The base station notifies the repeater of its beam information for one period. For example, as shown by arrow A15a in Fig. 15, the base station notifies the repeater of the beam ID "#1" of the base station using a portion of time units (one time unit) in one period.

[0165] The repeater continuously uses the DL Tx beam based on one notified beam information, for example, the repeater uses the DL Tx beam based on one notified beam information for a portion of the time units in one period.

[0166] For example, as shown by arrow A15b in Fig. 15, the repeater uses a DL Tx beam based on one notified beam information for two time units out of four time units in one period. For example, as shown by arrow A15c in Fig. 15, the repeater uses a DL Tx beam based on one notified beam information for two time units out of four time units in one period.

[0167] The sequence of time units over which beam control is applied may be indicated to the repeater as a number of consecutive time units. The sequence of time units over which beam control is applied may be indicated based on the start time and length of the time units.

[0168] The start time or length of time of the time unit for which beam control is applied may be predefined, for example, the time unit for which beam control is applied may start at a predefined offset from the reception of the beam information and span a predefined length.

[0169] The base station may notify the repeater of the periodic pattern of the base station's beam information.

[0170] The base station may notify the repeater of the period of the base station's beam information and an offset. The offset may indicate, for example, the time unit at which the DL Tx beam starts to be transmitted within one period. The repeater may also be notified of the number of time units to which beam control is applied within one period (2 in the example of FIG. 15).

[0171] Figure 16 is a diagram illustrating another example of Proposal 3 - Option 4. "Beam indication" in Figure 16 indicates beam information that the base station notifies the repeater. The beam information is, for example, the beam ID of the base station.

[0172] The base station notifies the repeater of its beam information for one period. For example, as shown by arrow A16a in Fig. 16, the base station notifies the repeater of the beam ID "#2" of the base station using a portion of the time units (one time unit) in one period.

[0173] The repeater continuously uses the DL Tx beam based on the notified beam information. For example, the repeater transmits the DL Tx beam based on the notified beam information over the third and fourth time units of the four time units in one period based on the offset notified by the base station.

[0174] The base station may control the DL Tx beams of the repeater so that the multiple DL Tx beams at the repeater do not overlap.

[0175] For example, the base station controls the repeater's DL Tx beam so that a DL Tx beam corresponding to beam #1 is transmitted in the first and second time units of one period, as shown in Figure 15. Also, the base station controls the repeater's DL Tx beam so that a DL Tx beam corresponding to beam #2 is transmitted in the third and fourth time units of one period, as shown in Figure 16.

[0176] By the above operation, the repeater can continuously transmit multiple DL Tx beams using multiple time units within one period.

[0177] <Proposal 3 - Option 5> The base station uses existing beam setting for the terminal. The repeater decodes the signal for the terminal.

[0178] For example, the base station may use an existing beam configuration (instruction) in a DL channel or DL ​​RS for a terminal (e.g., all terminals in a cell or group). For example, the base station may use an existing beam configuration (e.g., a cell-specific RNTI or a group-common RNTI) in a PDSCH, a PDCCH, an SSB, or a CSI-RS. Because the existing beam configuration is intended for the terminal, the repeater decodes the DL channel or DL ​​RS.

[0179] In addition, the beam information of the base station may be indicated by the DL RS resource ID (CSI-RS ID or SSB index) or TCI state ID of the base station.

[0180] <Proposal 3 - Option 6> The repeater refers to the TCI state of DCI 1_x. The repeater decodes the DCI for the terminal.

[0181] For example, the base station uses DCI (DCI 1_x) for scheduling PDSCH to notify the repeater of beam information. The TCI status field of the DCI indicates beam information such as the base station's Tx beam ID. The beam information (base station's Tx beam ID) notified to the repeater and the repeater's DL Tx beam corresponding to the beam information are applied to the slot or symbol indicated in the Time Domain Resource Allocation (TDRA) field of the DCI.

[0182] The repeater may not need to decode the PDSCH, in which case it may simply amplify and forward the DL signal.

[0183] For example, when a repeater receives DCI 1_x, if the base station instructs the repeater to transmit only DL signals to the terminal, the repeater does not need to decode the PDSCH. The repeater (the Mobile Termination (MT) function of the repeater) does not need to decode or process the PDSCH of the resource indicated in the DCI in the following manner.

[0184] (Method 1): If a predefined value is set in one or more existing fields (or new fields) of the DCI, the repeater transmits only DL signals from the base station to the terminal in the slot or symbol indicated in the DCI. The repeater does not decode or process the PDSCH of the resource indicated in the DCI.

[0185] (Method 2): When the repeater detects DCI in a specific RNTI, search space (SS) set, or control-resource set (CORESET), it transmits only DL signals from the base station to the terminal in the slot or symbol indicated in the DCI. The repeater does not decode or process the PDSCH of the resource indicated in the DCI.

[0186] As an alternative to the above methods 1 and 2, a new DCI format may be introduced.

[0187] For example, the new DCI format includes a field similar to the TCI status field of DCI 1_x, which indicates the beam information of the base station.

[0188] The new DCI format also includes a field similar to the TDRA field of DCI 1_x, which indicates the applicable time (e.g., slot offset and symbol position within the slot) of the base station beam information notified to the repeater.

[0189] <Proposal 3 - Option 7> Use the TCI status of the SPS configuration / activation, or specify the TCI status of the SPS configuration / activation for repeaters.

[0190] The PDSCH of the SPS is configured by an RRC parameter such as SPS-Config. The transmission of the PDSCH of the SPS is activated and deactivated (deactivation / release) by an activation DCI (DCI).

[0191] For example, the base station uses the SPS activation DCI to notify the repeater of beam information. The TCI status field in the SPS activation DCI indicates beam information such as the base station's Tx beam ID. The beam information (base station's Tx beam ID) notified to the repeater and the repeater's DL Tx beam corresponding to the beam information are applied to the slot or symbol indicated in the SPS configuration (RRC parameter) or the TDRA field of the SPS activation DCI.

[0192] For example, the SPS configuration may indicate the period of the beam information. The TDRA field of the SPS activation DCI may indicate the slot offset or symbol position within the slot of the DL Tx beam at the repeater.

[0193] The repeater may not need to decode the PDSCH, in which case it may simply amplify and forward the DL signal.

[0194] For example, the repeater receives an SPS configuration (RRC parameter) or an activation DCI. In this case, if the base station instructs the repeater to transmit only DL signals to the terminal, the repeater does not need to decode the PDSCH.

[0195] For example, if a predefined value is set in one or more existing fields (or new fields) of the SPS configuration or activation DCI, the repeater transmits only DL signals from the base station to the terminal in the slot or symbol indicated in the activation DCI (TDRA).The repeater does not decode or process PDSCH of the resource indicated in the activation DCI.

[0196] In addition, a new RRC configuration or DCI similar to the SPS configuration or activation DCI may be introduced.

[0197] For example, the new RRC configuration or DCI includes a field similar to the TCI status field of the activation DCI, which indicates the beam information of the base station.

[0198] The new RRC configuration or DCI also includes a field similar to the field that sets the SPS period in the SPS configuration. This field indicates the applicable time (e.g., slot offset and symbol position within the slot) of the beam information of the base station notified to the repeater.

[0199] The new RRC configuration or DCI also includes a field similar to the TDRA field of the activation DCI, which indicates the slot or symbol for controlling the DL Tx beam of the repeater.

[0200] <Proposal 3 - Option 8> The base station uses the TCI status of Rel-17 to notify beam information.

[0201] Rel-17 defines the unified TCI state indication DCI as shown in Figure 17. The TCI state field of the Rel-17 unified TCI state indication DCI indicates beam information such as the base station's Tx beam ID. The base station uses the Rel-17 unified TCI state indication DCI to notify the repeater of the base station's beam information.

[0202] The beam information (base station Tx beam ID) notified to the repeater and the DL Tx beam of the repeater corresponding to the beam information may start from the first symbol / slot in at least X slots / X symbols after the last slot / symbol of the PUCCH that transmits the HARQ-ACK of the DCI.

[0203] Alternatively, the beam information notified to the repeater and the DL Tx beam of the repeater corresponding to the beam information may start from the first symbol / slot in at least X slots / X symbols after the slot / symbol in which the DCI is received.

[0204] Note that X may be predefined, configured, or subject to a repeater function.

[0205] In addition, a new DCI format may be introduced to notify the repeater of the base station's beam information.

[0206] For example, the new DCI format includes a field similar to the TCI status field of the unified TCI state indication DCI in Rel-17. This field indicates the beam information of the base station. This field also indicates the time at which the beam information is applicable (e.g., slot offset and symbol position within the slot).

[0207] <Proposal 3 - Variations> In each option of Proposal 3, multiple beam information of the base station may be indicated for each time unit.

[0208] In each option of Proposal 3, the time unit may be set for each of multiple frequency resources (each frequency resource area unit). The base station may notify the base station's beam information in the time unit for each of the multiple frequency resources. In this case, the repeater may transmit DL signals simultaneously using multiple DL Tx beams in each of the multiple frequency resources.

[0209] <Proposal 4> Proposal 4 assumes the operation of Type 1 described in Proposal 1. The base station uses the base station's beam information to notify the repeater's DL Tx beam for each DL RS resource of the base station. Proposal 4 may have the following Options 1 and 2.

[0210] (Option 1): The repeater decodes the RS for the terminal and obtains the beam information of the base station. (Option 2): The base station notifies the repeater of the beam information using the same method as for the existing RS for terminals.

[0211] <Proposal 4 - Option 1> As explained in Proposal 2 - Option 2, the base station instructs the beam for each DL RS resource of the base station. The DL RS resource (RS) of the base station may be for the terminal. Therefore, the repeater decodes the RS for the terminal and obtains the beam information of the base station.

[0212] For example, the repeater decodes the DL RS (e.g., SSB / CSI-RS) configuration, DL RS activation, or DL ​​RS triggering for the terminal to obtain information about the DL RS resources of the base station and the beam information of the base station used for each DL RS resource. The repeater controls the DL Tx beam using the obtained beam information.

[0213] Note that the repeater may only decode the DL RS configuration, DL RS activation, or DL ​​RS triggering of the base station for all terminals in a cell or group (i.e., cell-specific or group-specific DL RSs). For example, the repeater may decode the DL RS resources of the base station using a cell-specific RNTI or a group-common RNTI.

[0214] <Proposal 4 - Option 2> The base station notifies the repeater of information about the DL RS resources of the base station and information about the beam of the base station used for each DL RS resource, using existing signaling in the DL RS configuration, DL RS activation, or DL ​​RS triggering of the base station and existing signaling of beam instruction in the DR SR for the terminal. Proposal 4 - Option 2 may have the following variants 1 and 2.

[0215] (Variation 1): When using the DL RS resource of the base station, the base station may notify the repeater that the DL RS resource does not need to be decoded. The base station may instruct the repeater to amplify and forward the DL signal.

[0216] (Variation 2): The base station may consider cases where the repeater does not need to decode the DL RS of the base station and may notify the repeater of beam information and time domain resources. The time domain resources may include periodic / semi-persistent / non-periodic time domain operation, slot-level period and offset, or OFDM symbol position within the slot (start symbol and symbol length).

[0217] <Proposal 4 - Variations> In each option of Proposal 4, multiple beam information of a base station may be indicated for each time unit.

[0218] In each option of Proposal 4, the time unit may be set for each of multiple frequency resources (each frequency resource area unit). The base station may notify the base station's beam information in the time unit for each of the multiple frequency resources. In this case, the repeater may transmit DL signals simultaneously using multiple DL Tx beams in each of the multiple frequency resources.

[0219] <Proposal 5> Proposal 5 assumes the operation of Type 2 described in Proposal 1. The base station notifies the repeater's DL Tx beam for each time unit using the repeater's transmit beam information. Proposal 5 may have the following options 1 to 7.

[0220] (Option 1): The base station notifies multiple consecutive repeater beam information (e.g., repeater beam IDs). (Option 2): The base station notifies one repeater beam information. The repeater sets the same beam information consecutively. (Option 3): The base station sets multiple consecutive repeater beam information periodically. (Option 4): The base station notifies one repeater beam information. The repeater sets the same beam information consecutively and periodically. (Option 5): The repeater refers to the TCI status of DCI 1_x. The repeater decodes the DCI for the terminal. (Option 6): The TCI status of SPS configuration / activation is used. Or, the TCI status of SPS configuration / activation is specified for the repeater. (Option 7): The base station uses the TCI status of Rel-17 to notify repeater beam information.

[0221] <Proposal 5 - Option 1> The base station notifies the repeater of multiple consecutive repeater beam information. The repeater controls the DL Tx beam based on the multiple consecutive repeater beam information.

[0222] Figure 18 is a diagram illustrating an example of Proposal 5 - Option 1. "Beam indication" in Figure 18 indicates beam information that the base station notifies the repeater. The beam information is, for example, the beam ID of the repeater.

[0223] As shown in Figure 18, a series of beam information of the repeater is applied in a series of time units. The base station notifies different beam information for each time unit. For example, the base station notifies beam #a of the repeater in the time unit indicated by arrow A15 in Figure 18. For example, the base station notifies beam #b in the time unit indicated by arrow A16 in Figure 18.

[0224] Figure 19 is a diagram illustrating another example of Proposal 5 - Option 1. In Figure 19, the length of the time unit is different from that in Figure 18. The time units shown in Figure 18 have a constant length, but the time units in Figure 19 do not have a constant length. Note that, similar to the explanation of Figure 18, the base station notifies different beam information of the repeater for each time unit in Figure 19 as well.

[0225] The sequence of time units over which beam control is applied may be indicated to the repeater as a number of consecutive time units. The sequence of time units over which beam control is applied may be indicated based on the start time and length of the time units.

[0226] The start time or length of time of the time unit for which beam control is applied may be predefined, for example, the time unit for which beam control is applied may start at a predefined offset from the reception of the beam information and span a predefined length.

[0227] Furthermore, the sequence of time units to which beam control is applied may be notified to the repeater using a sequence of time unit IDs. The beam information of the repeater may be associated with the time units. For example, the beam ID of the repeater may be associated with the time unit ID.

[0228] <Proposal 5 - Option 2> The base station notifies the repeater of one repeater beam information. The repeater continuously sets the notified one beam information. In other words, the repeater continuously uses the DL Tx beam based on the notified one beam information.

[0229] Fig. 20 is a diagram illustrating an example of Proposal 5 - Option 2. "Beam indication" in Fig. 20 indicates beam information that the base station notifies the repeater. The beam information is, for example, the beam ID of the repeater.

[0230] 20, the base station notifies the repeater of beam information of the repeater in a certain time unit. For example, the base station notifies the repeater of beam #a in a certain time unit.

[0231] The repeater continuously uses a DL Tx beam based on one notified beam information. For example, the repeater uses a DL Tx beam based on one notified beam information for multiple time units. In the example of Figure 20, the repeater uses a DL Tx beam based on the repeater's beam ID "#a" for multiple time units.

[0232] The sequence of time units over which beam control is applied may be indicated to the repeater as a number of consecutive time units. The sequence of time units over which beam control is applied may be indicated based on the start time and length of the time units.

[0233] The start time or length of time of the time unit for which beam control is applied may be predefined, for example, the time unit for which beam control is applied may start at a predefined offset from the reception of the beam information and span a predefined length.

[0234] The sequence of time units may also be indicated to the repeater from the base station as a sequence of time unit IDs.

[0235] <Proposal 5 - Option 3> The base station periodically sets multiple consecutive repeater beam information. The repeater periodically controls the DL Tx beam based on the multiple consecutive repeater beam information notified by the base station.

[0236] Fig. 21 is a diagram illustrating an example of Proposal 5 - Option 3. "Beam indication" in Fig. 21 indicates beam information that the base station notifies the repeater. The beam information is, for example, the beam ID of the repeater.

[0237] The base station notifies the repeater of the beam information of the repeater in one period. For example, as shown in Fig. 21, the base station notifies the repeater of the beam ID "#a, #b, #c, #d" of the repeater once using all the time units (four time units) in one period.

[0238] When a repeater receives the repeater's beam ID "#a, #b, #c, #d" in one cycle, it repeatedly (periodically) transmits the DL Tx beam with the received beam ID "#a, #b, #c, #d".

[0239] The base station may notify the repeater of the periodic pattern of the repeater's beam information.

[0240] The base station may notify the repeater of the period and offset of the repeater's beam information. The offset may indicate, for example, the time unit at which the periodic DL Tx beam transmission begins. The sequence of the repeater's beam information may be indicated by each beam information (e.g., "#a, #b, #c, #d") that applies to one time unit in one period.

[0241] <Proposal 5 - Option 4> The base station notifies one repeater beam information. The repeater sets the same beam information continuously and periodically.

[0242] Fig. 22 is a diagram illustrating an example of Proposal 5 - Option 4. "Beam indication" in Fig. 22 indicates beam information that the base station notifies the repeater. The beam information is, for example, the beam ID of the repeater.

[0243] The base station notifies the repeater of the beam information of the repeater in one period once. For example, as shown by arrow A17 in Figure 22, the base station notifies the repeater of the beam ID "#a" of the repeater using a part of the time unit (one time unit) in one period.

[0244] The repeater continuously uses the DL Tx beam based on one notified beam information, for example, the repeater uses the DL Tx beam based on one notified beam information for a portion of the time units in one period.

[0245] For example, as shown by arrow A18 in Fig. 22, the repeater uses a DL Tx beam based on one notified beam information for two time units out of four time units in one period. For example, as shown by arrow A19 in Fig. 22, the repeater uses a DL Tx beam based on one notified beam information for two time units out of four time units in one period.

[0246] The sequence of time units over which beam control is applied may be indicated to the repeater as a number of consecutive time units. The sequence of time units over which beam control is applied may be indicated based on the start time and length of the time units.

[0247] The start time or length of time of the time unit for which beam control is applied may be predefined, for example, the time unit for which beam control is applied may start at a predefined offset from the reception of the beam information and span a predefined length.

[0248] The base station may notify the repeater of the periodic pattern of the repeater's beam information.

[0249] The base station may notify the repeater of the beam information period and offset of the repeater. The offset may indicate, for example, the time unit at which the DL Tx beam starts to be transmitted within one period. The base station may also notify the repeater of the number of time units to which beam control is applied within one period (2 in the example of FIG. 22).

[0250] Figure 23 is a diagram illustrating another example of Proposal 5 - Option 4. "Beam indication" in Figure 23 indicates beam information that the base station notifies the repeater. The beam information is, for example, the beam ID of the repeater.

[0251] The base station notifies the repeater of the beam information of the repeater in one period. For example, as shown by arrow A20 in Figure 23, the base station notifies the repeater of the beam ID "#b" of the repeater using a part of the time unit (one time unit) in one period.

[0252] The repeater continuously uses the DL Tx beam based on one piece of notified beam information. For example, the repeater uses the DL Tx beam based on one piece of notified beam information for the third and fourth time units out of four time units in one period based on the offset notified by the base station.

[0253] The base station may control the DL Tx beams of the repeater so that the multiple DL Tx beams at the repeater do not overlap.

[0254] For example, the base station controls the DL Tx beam of the repeater so that the DL Tx beam of beam #a is transmitted in the first and second time units of one period, as shown in Figure 22. Also, the base station controls the DL Tx beam of the repeater so that the DL Tx beam of beam #b is transmitted in the third and fourth time units of one period, as shown in Figure 23.

[0255] By the above operation, the repeater can continuously transmit multiple DL Tx beams using multiple time units within one period.

[0256] <Proposal 5 - Option 5> The repeater refers to the TCI state of DCI 1_x. The repeater decodes the DCI for the terminal.

[0257] For example, the base station notifies the repeater of beam information using the TCI status field or a new field of the DCI (DCI 1_x) that schedules the PDSCH. The TCI status field or the new field of the DCI indicates beam information such as the DL Tx beam ID of the repeater. The beam information notified to the repeater (the DL Tx beam ID of the repeater) and the DL Tx beam of the repeater are applied to the slot or symbol indicated in the TDRA field of the DCI.

[0258] The repeater may not need to decode the PDSCH, in which case it may simply amplify and forward the DL signal.

[0259] For example, when a repeater receives DCI 1_x, if the base station instructs the repeater to transmit only DL signals to the terminal, the repeater does not need to decode the PDSCH. The repeater (MT function of the repeater) does not need to decode or process the PDSCH of the resource indicated in the DCI in the following manner:

[0260] (Method 1): If a predefined value is set in one or more existing fields (or new fields) of the DCI, the repeater transmits only DL signals from the base station to the terminal in the slot or symbol indicated in the DCI. The repeater does not decode or process the PDSCH of the resource indicated in the DCI.

[0261] (Method 2): When the repeater detects DCI in a specific RNTI, SS set, or CORESET, it transmits only DL signals from the base station to the terminal in the slot or symbol indicated in the DCI. The repeater does not decode or process the PDSCH of the resource indicated in the DCI.

[0262] As an alternative to the above methods 1 and 2, a new DCI format may be introduced.

[0263] For example, the new DCI format includes a field similar to the TCI status field in DCI 1_x, which indicates the beam information of the repeater.

[0264] The new DCI format also includes a field similar to the TDRA field of DCI 1_x, which indicates the applicable time (e.g., slot offset and symbol position within the slot) of the repeater beam information notified to the repeater.

[0265] <Proposal 5 - Option 6> Use the TCI status of the SPS configuration / activation, or specify the TCI status of the SPS configuration / activation for repeaters.

[0266] The PDSCH of the SPS is configured by an RRC parameter such as SPS-Config. The transmission of the PDSCH of the SPS is activated and deactivated (deactivation / release) by an activation DCI (DCI).

[0267] For example, the base station uses the SPS activation DCI to notify the repeater of beam information. The TCI status field or a new field in the SPS activation DCI indicates beam information such as the repeater's DL Tx beam ID. The beam information (repeater's DL Tx beam ID) and the repeater's DL Tx beam notified to the repeater are applied to the slot or symbol indicated in the SPS configuration (RRC parameter) or the TDRA field of the SPS activation DCI.

[0268] For example, the SPS configuration may indicate the period of the beam information. The TDRA field of the SPS activation DCI may indicate the slot offset or symbol position within the slot of the DL Tx beam at the repeater.

[0269] The repeater may not need to decode the PDSCH, in which case it may simply amplify and forward the DL signal.

[0270] For example, the repeater receives an SPS configuration (RRC parameter) or an activation DCI. In this case, if the base station instructs the repeater to transmit only DL signals to the terminal, the repeater does not need to decode the PDSCH.

[0271] For example, if a predefined value is set in one or more existing fields (or new fields) of the SPS configuration or activation DCI, the repeater transmits only DL signals from the base station to the terminal in the slot or symbol indicated in the activation DCI (TDRA).The repeater does not decode or process PDSCH of the resource indicated in the activation DCI.

[0272] In addition, a new RRC configuration or DCI similar to the SPS configuration or activation DCI may be introduced.

[0273] For example, the new RRC configuration or DCI includes a field similar to the TCI status field of the activation DCI, which indicates the beam information of the repeater.

[0274] The new RRC configuration or DCI also includes a field similar to the field that sets the SPS period in the SPS configuration. This field indicates the applicable time (e.g., slot offset and symbol position within the slot) of the repeater beam information notified to the repeater.

[0275] The new RRC configuration or DCI also includes a field similar to the TDRA field of the activation DCI, which indicates the slot or symbol for controlling the DL Tx beam of the repeater.

[0276] <Proposal 5 - Option 7> The base station uses the TCI status of Rel-17 to notify repeater beam information.

[0277] Rel-17 defines the unified TCI state indication DCI as shown in Figure 17. The TCI state field or a new field of the Rel-17 unified TCI state indication DCI indicates beam information such as the DL Tx beam ID of the repeater. The base station uses the Rel-17 unified TCI state indication DCI to notify the repeater of its beam information.

[0278] The beam information (repeater Tx beam ID) and repeater DL Tx beam notified to the repeater may start from the first symbol / slot in at least X slots / X symbols after the last slot / symbol of the PUCCH that transmits the HARQ-ACK of the DCI.

[0279] Alternatively, the beam information notified to the repeater and the DL Tx beam of the repeater may start from the first symbol / slot in at least X slots / X symbols after the slot / symbol in which the DCI was received.

[0280] Note that X may be predefined, configured, or subject to a repeater function.

[0281] Also, a new DCI format may be introduced to notify repeaters of their beam information.

[0282] For example, the new DCI format includes a field similar to the TCI state field of the unified TCI state indication DCI in Rel-17. This field indicates the beam information of the repeater. This field also indicates the time at which the beam information is applicable (e.g., slot offset and symbol position within the slot).

[0283] <Proposal 5 - Variations> In each option of Proposal 5, the repeater's multiple beam information may be shown for each time unit.

[0284] In each option of Proposal 5, the time unit may be set for each of multiple frequency resources (each frequency resource area unit). The base station may notify the repeater's beam information in the time unit of each of the multiple frequency resources. In this case, the repeater may transmit DL signals simultaneously using multiple DL Tx beams in each of the multiple frequency resources.

[0285] The beam information of the repeater in Proposal 5 may be notified from the base station to the repeater based on the following Alt.1 to Alt.3.

[0286] (Alt. 1): The repeater beam information may be, for example, a repeater DL Tx beam ID or a repeater DL Tx spatial domain filter ID. Different IDs may refer to different spatial domain filters.

[0287] (Alt. 2): The beam information of the repeater in Proposal 5 may be notified from the base station to the repeater via the repeater DL RS resource ID.

[0288] The repeater DL RS resource is a newly defined RS resource used to manage the repeater's beam information (see Proposal 2 - Option 4) and may be used for the repeater's spatial domain filter RS.

[0289] Each repeater DL RS resource occupies a specific time domain resource indicated by the base station.

[0290] The repeater amplifies the DL RS of the base station in each repeater DLRS resource and forwards it to the terminal.

[0291] When the repeater DL RS resource ID is indicated as the beam ID of a time unit, it may mean that the same repeater DL Tx spatial domain filter as the repeater DL RS resource is used for the time unit.

[0292] (Alt. 3): The repeater's beam information may be notified from the base station to the repeater as a repeater TCI state ID.

[0293] To indirectly refer to the repeater DL RS resource ID, a repeater TCI state ID is newly defined. For example, each repeater TCI state is associated with a repeater DL RS resource. If the repeater TCI state ID is indicated as the beam ID of a time unit, it may mean that the same repeater DL Tx spatial domain filter as the repeater DL RS resource associated with the repeater TCI state is used for the time unit.

[0294] The repeater DL RS resource is a newly defined RS resource used for repeater DL Tx beam management (see Proposal 2 - Option 4) and may be used for the RS of the repeater spatial domain filter.

[0295] Each repeater DL RS resource occupies a specific time domain resource indicated by the base station.

[0296] The repeater amplifies the DL RS of the base station in each repeater DL RS resource and transmits it to the terminal.

[0297] <Proposal 6> Proposal 6 assumes the operation of Type 2 described in Proposal 1. The base station notifies the DL Tx beam for each RS resource defined for the DL Tx beam of the repeater.

[0298] As explained in Proposal 2 - Option 4, the repeater DL RS resource is a newly defined RS resource used to manage the DL Tx beam of the repeater. Each repeater DL RS resource occupies a specific time domain resource indicated by the base station. In each repeater DL RS resource, the repeater amplifies the DL RS of the base station and forwards it to the terminal.

[0299] The repeater DL RS resource configuration is explained below.

[0300] (1): A repeater may be configured with multiple repeater DL RS resources.

[0301] (2): Each repeater DL RS resource may occupy multiple adjacent symbols. The number of adjacent symbols (the number of supported candidates) may be predefined. For example, the number of adjacent symbols may be 1, 2, or 4.

[0302] (3) Repeater DL RS resource sets (hereinafter sometimes referred to as resource sets) may be configured. Each resource set is composed of multiple repeater DL RS resources. The number of resources in each resource set (the number of supported resource candidates) may be predefined or determined by the repeater's capabilities.

[0303] (4): For a repeater DL RS resource or resource set, the following parameters (information) may be configured by the SCI (RRC / MAC CE / DCI): Repeater DL RS resource ID / resource set ID Parameters related to the time domain behavior, e.g., a parameter indicating whether the resource type of the repeater DL RS resource or resource set is periodic, semi-persistent, or aperiodic Slot-level periodicity of the repeater DL RS resource / resource set (for P / SP resources / resource sets) Slot-level offset of the repeater DL RS resource / resource set Symbol position of the resource within the slot (including the start symbol and number of symbols)

[0304] (5): In the case of semi-persistent repeater DL RS resources / resource sets, the SCI may activate and deactivate the repeater's forwarding operation. For example, when the repeater DL RS resources are activated, the repeater forwards DL signals using the repeater DL RS resources. When the repeater DL RS resources are deactivated, the repeater does not forward DL signals using the repeater DL RS resources. An indicator indicating the activation and deactivation of the repeater DL RS resource ID / resource set ID may be included in the SCI.

[0305] (6): For aperiodic repeater DL RS resource / resource set, the repeater DL RS resource / resource set may be triggered by an SCI. The repeater may transmit a DL signal to the terminal when the repeater DL RS resource / resource set is triggered by an SCI.

[0306] The repeater DL RS resource ID / resource set ID may be included in the SCI for triggering the repeater DL RS resource / resource set, or a parameter indicating the trigger status of the repeater DL RS resource ID / resource set ID may be included in the SCI. The trigger status may be configured for each repeater DL RS resource / resource set.

[0307] The slot offset or the symbol position of the resource within the slot (including the starting symbol and the number of symbols) may be indicated by the SCI.

[0308] The repeater DL Tx beam used in the repeater DL RS resource may operate according to the following Alt. 1 to Alt. 3 and variations.

[0309] (Alt. 1): The repeater DL Tx beam may depend on the repeater implementation, e.g., by default, different repeater DL Tx beams may be used for different repeater DL RS resources within the same resource set.

[0310] (Alt. 2): The DL Tx beam of the repeater may be instructed by the base station via RRC or MAC CE in each repeater DL RS resource.

[0311] For example, a repeater DL Tx beam ID that directly refers to the repeater's spatial domain filter used for DL ​​transmission (DL forwarding) is indicated by the base station. Alternatively, the ID of another repeater DL RS resource (referred to as a reference repeater DL RS resource) is indicated by the base station to determine the spatial domain filter of the repeater DL RS resource (referred to as a target repeater DL RS resource). This means that the same repeater DL Tx spatial domain filter as that of the indicated reference repeater DL RS resource is used for the target repeater DL RS resource. Alternatively, the ID of the repeater TCI state associated with the reference repeater DL RS resource is indicated by the base station.

[0312] (Alt.3): The repeater's DL Tx beam may operate according to instructions from the base station if instructed to do so, or may operate in an implementation-dependent manner if not instructed to do so by the base station. The instructions may be provided by the SCI.

[0313] (Variation): For example, similar to CSI-RS, the parameter "Repetition" = {ON, OFF} may be specified for the resource set.

[0314] For example, Repetition=ON means that the repeater uses the same DL Tx beam for all repeater DL RS resources in the resource set, and Repetition=OFF means that the repeater uses different DL Tx beams for different repeater DL RS resources in the resource set.

[0315] <Proposal 7> The base station notifies the repeater of the transmission beam using the base station's beam information. In Proposal 7, the following operations may be assumed for Type 1 operations described in Proposal 1 and Option 5 of Proposal 2.

[0316] (1): The contents (operation) of Proposal 4 are used to instruct the repeater on the information of each DL RS resource of the base station and the Tx beam (beam information) of the base station in each DL RS resource.

[0317] (2): For each DL RS resource of the base station, the Tx DL beam ID of the repeater is indicated by the base station. Alternatively, for each DL RS resource of the base station, the Tx DL beam ID of the repeater depends on the implementation of the repeater. The Tx DL beam ID of the repeater is reported to the base station.

[0318] (3): For each Tx beam of the base station (for each TCI state), the repeater's Tx DL beam ID is indicated by the base station. Alternatively, for each Tx beam of the base station (for each TCI state), the repeater's Tx DL beam ID depends on the repeater implementation. The repeater's Tx DL beam ID is reported to the base station.

[0319] In addition, a new term, "repeater DL Tx beam ID," may be defined to mean the repeater's spatial domain filter used to transmit (forward) DL signals.

[0320] <Proposal 8> Repeaters utilize the RS measurement and reporting mechanisms at the terminal.

[0321] The repeater utilizes the CSI framework: it measures the DL RS from the base station and reports it to the base station.

[0322] The repeater function can be considered as the function of the repeater MT. The repeater MT has the same function as a terminal or IAB-MT. For example, the repeater MT connects to a base station like a terminal and receives control signals from the base station. IAB stands for Integrated Access and Backhaul.

[0323] In addition, to determine the quality of the base station's Tx beam toward the repeater, a Radio Resource Management (RRM) framework may be used to measure the Tx beam. In the RRM framework, the repeater measures the quality of the base station's Tx beam and reports it to the base station.

[0324] The following modifications or restrictions may be considered for the CSI report configuration or CSI resource configuration in the repeater. In other words, the measurement function in the terminal may be modified or restricted and applied to the repeater.

[0325] (1): The repeater may be able to set only SSB or CSI-RS as the RS for beam measurement. In other words, the repeater may be able to set either SSB or CSI-RS as the RS for beam measurement.

[0326] (2) Only some resource types, periodic, semi-persistent, and aperiodic, may be used for repeater CSI resource configuration.

[0327] (3) Only some resource types of periodic, semi-persistent, and aperiodic may be used for the repeater's CSI report configuration.

[0328] (4): Only a portion of the quantities of "cri-RI-PMI-CQI", "cri-RI-i1", "cri-RI-i1-CQI", "cri-RI-CQI", "cri-RSRP", "cri-SINR", "ssb-Index-RSRP", "ssb-Index-SINR", or "cri-RI-LI-PMI-CQI" may be configured for the repeater. In other words, the repeater may report the portion of the quantities (Report Quantity) to the base station for CSI reporting.

[0329] (5): Only non-group-based beam reporting may be configured in the repeater. For example, in the repeater, the RRC parameter “groupBasedBeamReport” (see, for example, 3GPP TS 38.331 V16.7.0 (2021-12) Chapter 6.3.2 and 3GPP TS 38.214 V16.8.0 (2021-12) Chapter 5.2.1.4.2) may be set to “disabled” only, not “enabled.”

[0330] (6) For a repeater, only repetition="OFF" may be set. In other words, the repeater does not perform repeated transmissions.

[0331] (7): Different candidate values ​​for the number of RSs reported from legacy terminals may be configured for repeaters. For example, a subset of candidate values ​​for measurement reports from legacy terminals may be configured for repeaters, and the values ​​may be smaller or larger than those of legacy terminals.

[0332] (8): A candidate value of the CSI resource period different from that of the legacy terminal may be configured for the repeater. For example, a candidate value of the CSI resource period different from that of the legacy terminal may be configured for the repeater, and the value may be smaller or larger than that of the legacy terminal (e.g., 640 / 1280 / 2560 / ... slots). Note that it is preferable that the candidate value of the CSI resource period configured for the repeater be larger than that of the legacy terminal.

[0333] (9): The maximum values ​​of parameters related to repeater measurements specified by higher layers such as RRC may differ from the maximum values ​​of parameters related to measurements by legacy terminals (e.g., see 3GPP TS 38.331 V16.7.0 (2021-12), Chapter 6.4).

[0334] 24 is a diagram showing an example of RRC parameters. In a repeater, the maximum values ​​of measurement-related parameters such as a CSI report configuration, a CSI resource configuration, a CSI-RS resource set, a CSI-RS resource, a CSI-RS resource set per resource configuration, a CSI-RS resource per CSI-RS resource configuration, and a CSI-RS resource per resource set may be different from the maximum values ​​of a legacy terminal. For example, the maximum values ​​of the repeater may be smaller or larger than the maximum values ​​of the legacy terminal.

[0335] Furthermore, in the repeater, some (types) of the RRC parameters related to measurements may be omitted (restricted) compared to the RRC parameters of the legacy terminal (may be few).

[0336] The legacy framework of terminal functions related to beam measurement and reporting may be utilized by the repeater.

[0337] Features required for legacy terminals may not be required for repeaters. Features required for legacy terminals may be made optional for repeaters. The candidate values / value ranges / parameters or default / required values / value ranges / parameters for repeaters may differ from those for legacy terminals.

[0338] For example, once a repeater is installed, it is unlikely to be moved. Therefore, as explained in Proposal 8, the measurement function at the terminal may be changed or restricted and applied to the repeater. This reduces the power consumption of the repeater and the cost of the repeater.

[0339] Proposals 1 to 8 have been explained above.

[0340] <Variation 1> Beam direction may be applied in a DL time unit. For example, the beam direction in Proposal 3 and Proposal 5 may be applied in a time unit designated as DL. Also, for example, the beam direction in Proposal 3 and Proposal 5 may be applied in at least one symbol of a time unit designated as DL.

[0341] Fig. 25 is a diagram illustrating an example of variation 1. Fig. 25 shows DL time units and UL time units.

[0342] For example, the base station may notify the beam information of the base station in the DL time unit. For example, the base station may notify the beam information of the repeater in the DL time unit.

[0343] Also, when a series of beam information is indicated in a series of time units, the series of beam information may be applied in the DL time units, in other words, the series of beam information is not applied to the UL time units.

[0344] <Variation 2> The base station may issue a joint instruction to the repeater to control the beam and to turn the repeater on or off. For example, in the operations described in Proposal 3 and Proposal 5, the base station may notify the repeater of beam information in some time units and instruct the repeater to turn off DL in some time units. Turning off DL in the repeater may mean that the repeater does not transmit (transfer) DL signals.

[0345] Fig. 26 is a diagram illustrating an example of Variation 2. As indicated by arrow A26a in Fig. 26, the base station notifies the repeater of beam information in a certain time unit. As indicated by arrow A26b in Fig. 26, the base station notifies the repeater of DL off in a certain time unit.

[0346] FIG. 27 is a diagram illustrating another example of Variation 2. FIG. 27 shows the repeater's ON-OFF Indication (operation instruction in DL). For example, if the repeater's ON-OFF Indication is ON, the base station notifies the repeater of beam information. The repeater transmits a DL Tx beam in the time unit in which the beam information is notified. On the other hand, if the repeater's ON-OFF Indication is OFF, the base station does not notify the repeater of beam information. The repeater turns off DL in the time unit in which the beam information is not notified.

[0347] <Variation 3> The base station may perform power control of the repeater. In other words, the repeater may be power-controlled by the base station.

[0348] The power control parameters for the repeater's DL Tx may be set for each DL Tx beam of the repeater, or the power control parameters for the repeater's DL Tx may be set for each time unit, or the power control parameters for the repeater's DL Tx may be set together with beam information for each time unit.

[0349] The power scaling level may be predefined or set, and may be indicated by two bits of information, for example, as follows:

[0350] 00: Maximum power 01: Maximum power x gap x 1 or Maximum power x scaling x 1 10: Maximum power x gap x 2 or Maximum power x scaling x 2 11: Zero power (OFF)

[0351] The power scaling level may be indicated for each time unit. The power scaling level may be notified from the base station to the repeater using signaling such as DCI, MAC CE, or RRC. The gap or scaling may be notified from the base station to the repeater using signaling such as DCI, MAC CE, or RRC.

[0352] <Functions of Base Station and Repeater> Figure 28 is a diagram showing an example of the functional configuration of the base station 12 and the repeater 13 according to one embodiment. As shown in Figure 28, the base station 12 and the repeater 13 include a transmitter 510, a receiver 520, a setting unit 530, and a controller 540. The functional configuration shown in Figure 28 is merely an example. The names of the functional divisions and functional units may be any as long as they can perform the operations according to the embodiment of the present disclosure.

[0353] The transmitter 510 generates a transmission signal from transmission data and transmits the generated transmission signal wirelessly. The receiver 520 receives various signals wirelessly and acquires higher layer signals from the received physical layer signals.

[0354] The setting unit 530 stores various setting information received from the communication partner by the receiving unit 520 in a storage device (storage unit), and reads the setting information from the storage device as needed. The setting unit 530 also stores preset setting information in the storage device. The setting unit 530 may be included in the control unit 540.

[0355] The control unit 540 performs overall control of the base station 12 and the repeater 13. The functional units in the control unit 540 related to signal transmission may be included in the transmitting unit 510, and the functional units in the control unit 540 related to signal reception may be included in the receiving unit 520.

[0356] (1): The receiver 520 of the repeater 13 receives multiple beams from the base station 12.

[0357] The control unit 540 of the repeater 13 determines a beam for the terminal 14 based on the beam information of the base station 12 that is included in the beam received by the receiving unit 520 and that is associated with each of the multiple beams.

[0358] By the above operation, the repeater 13 can appropriately control the beam directed toward the terminal 14 .

[0359] The control unit 540 of the repeater 13 holds a mapping rule R21 that associates multiple beam information of the base station 12 with multiple beam information intended for the terminal 14. The control unit 540 of the repeater 13 refers to the mapping rule R21, acquires beam information intended for the terminal 14 that corresponds to the beam information of the base station 12 included in the received beam, and determines the beam intended for the terminal 14.

[0360] Through the above operations, the repeater 13 can appropriately control the beam directed toward the terminal 14 .

[0361] In addition, the transmitter 510 of the base station 12 transmits multiple beams to the repeater 13.

[0362] The control unit 540 of the base station 12 includes beam information of the base station 12 associated with each of the multiple beams to be transmitted to the repeater 13 in the beam to be transmitted to the repeater 13, and controls the beam of the repeater 13 intended for the terminal 14.

[0363] Through the above operations, the repeater 13 allows the base station 12 to appropriately control the beam directed toward the terminal 14 .

[0364] (2): The receiver 520 of the repeater 13 receives a beam from the base station 12.

[0365] The control unit 540 of the repeater 13 determines a beam for the terminal 14 based on the beam information of the repeater 13 that is included in the beam received by the receiving unit 520 and that is associated with each of the multiple beams of the repeater 13.

[0366] By the above operation, the repeater 13 can appropriately control the beam directed toward the terminal 14 .

[0367] The receiver 520 of the repeater receives the beam with the best communication quality from the base station 12. Through the above operations, the repeater 13 can appropriately control the beam directed toward the terminal 14.

[0368] In addition, the control unit 540 of the base station 12 includes repeater beam information associated with each beam of the repeater 13 in the beam of the base station 12.

[0369] The transmitter 510 of the base station 12 transmits a beam including beam information of the repeater 13 to the repeater 13 .

[0370] Through the above operations, the repeater 13 allows the base station 12 to appropriately control the beam directed toward the terminal 14 .

[0371] The transmitter 510 of the base station 12 transmits the beam with the best communication quality to the repeater 13 .

[0372] Through the above operations, the repeater 13 allows the base station 12 to appropriately control the beam directed toward the terminal 14 .

[0373] (3): The receiver 520 of the repeater 13 receives multiple beams from the base station 12.

[0374] The control unit 540 of the repeater 13 determines a beam for the terminal 14 based on the beam information of the base station 12 included in each time unit of the beam received by the receiving unit 520 and associated with each of the multiple beams.

[0375] By the above operation, the repeater 13 can appropriately control the beam directed toward the terminal 14 .

[0376] One beam information is included over multiple time units, so that the repeater 13 can appropriately control the beam directed to the terminal 14.

[0377] In addition, the receiving unit 520 of the repeater 13 receives multiple beams from the base station 12.

[0378] The control unit 540 of the repeater 13 determines a beam for the terminal 14 based on the beam information of the base station 12 that is included in each of the resources for the reference signal included in the beam received by the receiving unit 520 and that is associated with each of the multiple beams.

[0379] By the above operation, the repeater 13 can appropriately control the beam directed toward the terminal 14 .

[0380] The control unit 540 of the repeater 13 decodes the reference signal for the terminal 14 and acquires the beam information of the base station 12 .

[0381] By the above operation, the repeater 13 can appropriately control the beam directed toward the terminal 14 .

[0382] (4): The receiver 520 of the repeater 13 receives a beam from the base station 12.

[0383] The control unit 540 of the repeater 13 determines a beam for the terminal 14 based on the beam information of the repeater 13 included in each time unit of the beam received by the receiving unit 520 and associated with each beam of the repeater 13.

[0384] By the above operation, the repeater 13 can appropriately control the beam directed toward the terminal 14 .

[0385] One beam information is included over multiple time units, so that the repeater 13 can appropriately control the beam directed to the terminal 14.

[0386] In addition, the receiving unit 520 of the repeater 13 receives a beam from the base station 12.

[0387] The control unit 540 of the repeater 13 determines a beam for the terminal 14 based on the beam information of the repeater 13 that is included in each resource for a reference signal included in the beam received by the receiving unit 520 and associated with each beam of the repeater 13.

[0388] By the above operation, the repeater 13 can appropriately control the beam directed toward the terminal 14 .

[0389] The control unit 540 of the repeater 13 decodes the reference signal and acquires beam information of the repeater 13 .

[0390] By the above operation, the repeater 13 can appropriately control the beam directed toward the terminal 14 .

[0391] (5) The control unit 540 of the repeater 13 measures the communication quality with the base station 12 using fewer types of signals than the terminal 14 uses to measure the communication quality.

[0392] The transmitter 510 of the repeater 13 transmits the measurement result of the communication quality with the base station 12 to the base station 12 .

[0393] By the above operation, the repeater 13 can appropriately control the beam directed toward the terminal 14 .

[0394] The resource types of the signal are limited to a subset of periodic, semi-persistent, and aperiodic resource types.

[0395] The resource types of the measurements are limited to a subset of periodic, semi-persistent, and aperiodic resource types.

[0396] The number of types of measurement results is less than the number of types of measurement results at the terminal.

[0397] The maximum value of the measurement specified by the higher layer is different from the maximum value of the measurement at the terminal.

[0398] Unlike the terminal 14, the repeater 13 is unlikely to move, and therefore, even if there are restrictions on its operation, etc., it can appropriately control the beam directed toward the terminal 14. Furthermore, since the repeater's operation, etc. is restricted, it can reduce its power consumption.

[0399] The present disclosure has been described above. Note that the division of items in the above description is not essential to the present disclosure, and items described in two or more items may be used in combination as needed, and items described in one item may be applied to items described in another item (unless they are inconsistent).

[0400] <Hardware Configuration, etc.> The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (e.g., using wires, wirelessly, etc.) and these multiple devices. The functional block may also be realized by combining software with the single device or the multiple devices.

[0401] Functions include, but are not limited to, judgment, determination, assessment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

[0402] For example, the base station 12 and the repeater 13 according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 29 is a diagram illustrating an example of the hardware configuration of the base station 12 and the repeater 13 according to an embodiment. The base station 12 and the repeater 13 described above may be physically 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, a bus 1007, etc.

[0403] In the following description, the term "apparatus" can be interpreted as a circuit, a device, a unit, etc. The hardware configuration of the base station 12 and the repeater 13 may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0404] Each function in the base station 12 and the repeater 13 is realized by loading specified software (programs) onto hardware such as the processor 1001 and memory 1002, causing the processor 1001 to perform calculations, control communication by the communication device 1004, and control at least one of reading and writing data in the memory 1002 and storage 1003.

[0405] The processor 1001 controls the entire computer by running, for example, an operating system. The processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, the above-mentioned control unit 540 and the like may be realized by the processor 1001.

[0406] The processor 1001 also reads 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 in accordance with these programs. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control units 540 of the base station 12 and the repeater 13 may be implemented by control programs stored in the memory 1002 and running on the processor 1001, and similar implementations may be used for other functional blocks. While the above-described various processes have been described as being executed by a single processor 1001, they may also 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 also be transmitted from a network via a telecommunications line.

[0407] The memory 1002 is a computer-readable recording medium and may be configured by, for example, at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The memory 1002 may also be called a register, a cache, a main memory (primary storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

[0408] Storage 1003 is a computer-readable recording medium, and may be composed of at least one of, for example, an optical disk such as a CD-ROM (Compact Disc 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 storage medium may be, for example, a database, a server, or other appropriate medium including at least one of memory 1002 and storage 1003.

[0409] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, 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 at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmitter 510 and receiver 520 may be realized by the communication device 1004.

[0410] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0411] 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.

[0412] The base station 12 and the repeater 13 may also 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.

[0413] <Notification of Information, Signaling> Notification of information is not limited to the embodiments described in the present disclosure and may be performed using other methods. For example, 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., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB))), other signals, or a combination thereof. Furthermore, 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, or the like.

[0414] <Applicable Systems> The embodiments described in the present disclosure are applicable to LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal)), FRA (Future Radio Access), NR (new Radio), New radio access (NX), Future generation radio access (FX), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802.34 (WiMAX (registered trademark The present invention may be applied to at least one of systems using 802.20, UWB (Ultra-Wide Band), Bluetooth (registered trademark), or other suitable systems, and next-generation systems that are extended, modified, created, or defined based on these systems. The present invention may also be applied to a combination of multiple systems (e.g., a combination of LTE and / or LTE-A with 5G).

[0415] <Processing Procedures, etc.> The processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be rearranged 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.

[0416] <Operation of Base Station> In the present disclosure, specific operations described as being performed by a base station may also be performed by its upper node in some cases. In a network consisting of one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal may be performed by at least one of the base station and another network node other than the base station (for example, an MME or an S-GW, etc., but are not limited to these). Although the above example illustrates a case where there is one other network node other than the base station, a combination of multiple other network nodes (for example, an MME and an S-GW) may also be used.

[0417] <Direction of Input / Output> Information, etc. (see <Information, Signal>) can be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). It may also be input / output via multiple network nodes.

[0418] <Handling of Input / Output Information, etc.> Input / output information, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input / output information, etc. may be overwritten, updated, or added. Output information, etc. may be deleted. Input information, etc. may be sent to another device.

[0419] <Determination method> The determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0420] <Variations of Aspects, etc.> Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched depending on the implementation. In addition, notification of predetermined information (e.g., notification that "X is true") is not limited to being done explicitly, but may be done implicitly (e.g., by not notifying the predetermined information).

[0421] 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.

[0422] <Software> 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.

[0423] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0424] Information, Signals, etc., described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which 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.

[0425] Note that terms described in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0426] <System, Network> As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0427] <Parameter and Channel Names> Furthermore, the information, parameters, and the like described in the present disclosure may be expressed using absolute values, relative values ​​from a predetermined value, or other corresponding information. For example, a radio resource may be indicated by an index.

[0428] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions 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 intended to be limiting in any way.

[0429] <Base Station> In the present disclosure, terms such as "base station (BS)," "radio 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. A base station may also be referred to by terms such as a macrocell, a small cell, a femtocell, and a picocell.

[0430] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a remote radio head (RRH)). The terms "cell" or "sector" refer to part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication services within that coverage area.

[0431] Mobile Station In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," and the like may be used interchangeably.

[0432] 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.

[0433] <Base Station / Mobile Station> At least one of the base station and the mobile station may be referred to as 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 mobile object, the mobile object itself, etc. The mobile object refers to a movable object, and may move at any speed. Naturally, this also includes cases where the mobile object is stationary. Examples of the mobile object include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones (registered trademark), multicopters, quadcopters, balloons, and objects mounted thereon. The mobile object may also be an autonomous mobile object operating based on an operational command. It may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile 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 be 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 IoT (Internet of Things) device such as a sensor.

[0434] Furthermore, the base station in the present disclosure may be read as a terminal. For example, the embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a terminal is replaced with communication between multiple terminals (which may be called, for example, D2D (Device-to-Device) or V2X (Vehicle-to-Everything)). In this case, the repeater 13 may be configured to have the functions of the base station 12 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0435] Similarly, the term "terminal" in the present disclosure may be interpreted as a base station, in which case the base station 12 may have the functions of the repeater 13 described above.

[0436] Fig. 30 shows an example configuration of a vehicle 2001. As shown in Fig. 30, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021 to 2029, an information service unit 2012, and a communication module 2013. Each aspect / embodiment described in the present disclosure may be applied to a communication device mounted on the vehicle 2001, and may be applied to the communication module 2013, for example. For example, the vehicle 2001 equipped with the functionality of the repeater 13 may function as a repeater vehicle that can move to a location where communication relay is required.

[0437] The drive unit 2002 is configured, for example, by 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.

[0438] 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 2029 provided in the vehicle 2001. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0439] The signals from the various sensors 2021 to 2029 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 obtained by a rotation speed sensor 2022, an air pressure signal of the front and rear wheels obtained by an air pressure sensor 2023, a vehicle speed signal obtained by a vehicle speed sensor 2024, an acceleration signal obtained by an acceleration sensor 2025, an accelerator pedal depression amount signal obtained by an accelerator pedal sensor 2029, a brake pedal depression amount signal obtained by a brake pedal sensor 2026, a shift lever operation signal obtained by a shift lever sensor 2027, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 2028.

[0440] 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 provides various types of multimedia information and multimedia services to the occupants of the vehicle 2001 by using information acquired from external devices via the communication module 2013, etc.

[0441] 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 millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g., GNSS, etc.), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps, etc.), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. In addition, the driving assistance system unit 2030 transmits and receives various information via the communication module 2013 to realize the driving assistance function or the autonomous driving function.

[0442] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via the communication port. For example, the communication module 2013 transmits and receives data via the communication port 2033 to and from the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021 to 29, which are provided in the vehicle 2001.

[0443] 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, or the like.

[0444] The communication module 2013 transmits, via wireless communication to an external device, a current signal from the current sensor that is input to the electronic control unit 2010. The communication module 2013 also transmits, via wireless communication to an external device, the rotation speed signals of the front and rear wheels acquired by a rotation speed sensor 2022, the air pressure signals of the front and rear wheels acquired by an air pressure sensor 2023, the vehicle speed signal acquired by a vehicle speed sensor 2024, the acceleration signal acquired by an acceleration sensor 2025, the accelerator pedal depression amount signal acquired by an accelerator pedal sensor 2029, the brake pedal depression amount signal acquired by a brake pedal sensor 2026, the shift lever operation signal acquired by a shift lever sensor 2027, and detection signals for detecting obstacles, vehicles, pedestrians, etc. acquired by an object detection sensor 2028, all of which are input to the electronic control unit 2010.

[0445] The communication module 2013 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from external devices and displays it on the information service unit 2012 provided in the vehicle 2001. The communication module 2013 also stores the various information received from the external devices 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, front wheels 2007, rear wheels 2008, axles 2009, sensors 2021 to 2029, etc. provided in the vehicle 2001.

[0446] <Meaning and Interpretation of Terms> 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, searching, inquiring (e.g., searching a table, database, or other data structure), ascertaining something that is considered 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 that are considered to be a "judging" or "determining." Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0447] 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 one or more wires, cables, and / or 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.

[0448] <Reference Signal> A reference signal can also be abbreviated as RS (Reference Signal), and may also be called a pilot depending on the applicable standard.

[0449] <Meaning of "based on"> 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."

[0450] "First," "Second" Any reference to an element using designations 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 method 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 or that the first element must precede the second element in some way.

[0451] <Means> The "means" in the configuration of each device above may be replaced with "section," "circuit," "device," or the like.

[0452] Open Format: 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." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0453] <Time Units such as TTI, Frequency Units such as RB, and Radio Frame Configuration> 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.

[0454] Numerology may be a communication parameter that applies to the transmission and / or reception of a signal or channel, and may indicate, for example, at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by the transceiver in the frequency domain, and specific windowing operations performed by the transceiver in the time domain.

[0455] A slot may be composed of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol). A slot may be a time unit based on numerology.

[0456] 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.

[0457] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0458] 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. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0459] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0460] 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) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0461] 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 for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0462] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0463] In addition, 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 shorter than the TTI length of a long TTI and greater than or equal to 1 ms.

[0464] A resource block (RB) is a resource allocation unit in the time domain and the 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 numerology, for example, 12. The number of subcarriers included in an RB may be determined based on numerology.

[0465] The time domain of an RB may include one or more symbols and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0466] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0467] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0468] A Bandwidth Part (BWP) (which may also be referred to as a fractional 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 their index relative to a Common Reference Point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0469] 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.

[0470] 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 the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0471] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples, and various changes may be made to 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, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc.

[0472] <Maximum Transmit Power> The "maximum transmit power" in the present disclosure may refer to the maximum value of transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0473] Articles In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0474] <"Different"> In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." Note that the term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0475] One aspect of the present disclosure is useful in wireless communication systems.

[0476] REFERENCE SIGNS LIST 1 wireless communication system 11 NG-RAN 12 base station 13 repeater 14 terminal 510 transmitting unit 520 receiving unit 530 setting unit 540 control unit

Claims

1. A receiving unit for receiving resource information of a signal to be transferred; a control unit that determines a transfer start timing and a transfer period of the signal based on the resource information; A repeater with.

2. The receiving unit receives the resource information including information indicating the transfer start timing at a slot level, The control unit determines the transmission start timing of the signal at a slot level based on the information. The repeater of claim 1 .

3. the receiving unit receives the resource information including first information indicating the transfer start timing based on a number of symbols from a beginning of a slot and second information indicating the transfer period based on the number of symbols; the control unit determines the transfer start timing of the signal based on the first information, and determines the transfer period of the signal based on the second information. The repeater of claim 1 .

4. the resource information is information of a periodic resource, The control unit determines the transfer start timing and the transfer period of the signal based on the information of the periodic resource. The repeater of claim 1 .

5. the resource information is semi-persistent resource information, The control unit determines the transfer start timing and the transfer period of the signal based on the information of the semi-permanent resource. The repeater of claim 1 .

6. A control unit that determines a transfer start timing and a transfer period of a signal to be transferred by the repeater; A transmitting unit that transmits resource information including the transfer start timing and the transfer period to the repeater; A base station having

7. A control unit that determines a transfer start timing and a transfer period of a signal to be transferred by the repeater; A transmitting unit that transmits resource information including the transfer start timing and the transfer period to the repeater; a base station having A receiving unit for receiving the resource information; a control unit that determines the transfer start timing and the transfer period of the signal based on the resource information; The repeater having A wireless system having the following:

8. Repeat customers, Receive resource information for a signal to be transmitted; determining a transfer start timing and a transfer period of the signal based on the resource information; Communication methods.