Terminals, wireless communication methods, base stations and systems

Abstract

A terminal according to an aspect of this disclosure includes: a reception unit that receives one reference signal among multiple reference signals transmitted using different resources; and a control unit that controls the reception of two or more reference signals among the multiple reference signals on the basis of the result of receiving the one reference signal. The number of the multiple reference signals is greater than 64. An aspect of this disclosure makes it possible to improve coverage taking into account overhead.

Description

Technical Field

[0004] , , , , ,

[0003] , ,

[0001] This disclosure relates to a terminal, a wireless communication method in a next-generation mobile communication system 、 base station and system and is concerned with

Background Art

[0002] In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) was specified for the purpose of achieving higher data rates, lower latency, etc. (Non-Patent Document 1). Also, for the purpose of further increasing capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9), LTE-Advanced (3GPP Rel. 10-14) was specified.

[0003] Successor systems to LTE (for example, 5th generation mobile communication system (5G), 5G+(plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later, etc.) are also being considered.

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

[0005] Improvements to coverage are being considered for future wireless communication systems (e.g., NR).

[0006] However, narrowing / increasing the beam to improve coverage may increase overhead and reduce communication throughput.

[0007] Therefore, this disclosure provides a terminal and wireless communication method that can improve coverage by taking overhead into consideration. 、 base station and system One of the objectives is to provide [this]. [Means for solving the problem]

[0008] A terminal relating to one aspect of this disclosure transmits using different resources. The data is time-divided and multiplexed, and divided into multiple groups, including the first group, the second group, and the third group. Multiple reference signals Of these, Group 1 A receiving unit that receives one of the reference signals, and the The aforementioned within the first group Receiving one reference signal To believe Based on the above, One or more reference signals in the second group and the aforementioned third group inside 1 More than one reference signal and, Received so It has a control unit that controls the system, and the number of the multiple reference signals is greater than 64. [Effects of the Invention]

[0009] According to one aspect of this disclosure, coverage can be improved by taking overhead into consideration. [Brief explanation of the drawing]

[0010] [Figure 1] Figures 1A and 1B show examples of beams and coverage. [Figure 2] Figures 2A and 2B show an example of an SSB multiplexing method. [Figure 3] Figures 3A and 3B show an example of a group multiplexing method. [Figure 4] FIG. 4 shows an example of the reception operation A. [Figure 5] FIG. 5 shows an example of the reception operation B. [Figure 6] FIG. 6 shows an example of the frequency hopping of the measurement target. [Figure 7] FIGS. 7A and 7B show an example of the period of the SSB. [Figure 8] FIG. 8 shows an example of the beam in the cell. [Figure 9] FIG. 9 shows an example of the selection method 1. [Figure 10] FIGS. 10A and 10B show an example of the selection method 2. [Figure 11] FIGS. 11A and 11B show another example of the selection method 2. [Figure 12] FIGS. 12A and 12B show an example of the measurement target based on the operations B and A. [Figure 13] FIGS. 13A and 13B show an example of the reception based on the operations B and A. [Figure 14] FIG. 14 shows an example of the instruction based on the value of the specific field. [Figure 15] FIGS. 15A and 15B show an example of the measurement target based on the groups A and B. [Figure 16] FIGS. 16A and 16B show an example of the reception based on the groups A and B. [Figure 17] FIG. 17 is a diagram showing an example of the schematic configuration of a wireless communication system according to an embodiment. [Figure 18] FIG. 18 is a diagram showing an example of the configuration of a base station according to an embodiment. [Figure 19] FIG. 19 is a diagram showing an example of the configuration of a user terminal according to an embodiment. [Figure 20] FIG. 20 is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment. [Figure 21] FIG. 21 is a diagram showing an example of a vehicle according to an embodiment.

DETAILED DESCRIPTION OF THE INVENTION

[0011] (TCI, spatial relations, QCL) In NR, it is being considered to control the receive processing (e.g., at least one of receive, demapping, demodulation, and decoding) and transmit processing (e.g., transmit, mapping, precoding, modulation, and encoding) of at least one of the signal and channel (referred to as signal / channel) at the UE based on the Transmission Configuration Indication state (TCI state).

[0012] The TCI state may represent the one applied to the downlink signal / channel. The equivalent of the TCI state applied to the uplink signal / channel may be expressed as a spatial relation.

[0013] TCI status refers to information about signal / channel quasi-co-location (QCL), and may also be called spatial reception parameters or spatial relation information. TCI status may be set for each channel or signal in the UE.

[0014] QCL is an index that indicates the statistical properties of a signal / channel. For example, if two signals / channels have a QCL relationship, it may mean that we can assume that at least one of the following is identical between these different signals / channels: Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter).

[0015] The spatial reception parameters may correspond to the UE's received beam (e.g., the received analog beam), and the beam may be identified based on the spatial QCL. In this disclosure, QCL (or at least one element of QCL) may be interpreted as sQCL (spatial QCL).

[0016] QCL may have multiple types (QCL types). For example, there may be four QCL types A and D that differ in the parameters (or parameter sets) that can be assumed to be the same, and these parameters (which may also be called QCL parameters) are shown below: • QCL Type A (QCL-A): Doppler shift, Doppler spread, mean delay and delay spread, • QCL Type B (QCL-B): Doppler shift and Doppler spread, • QCL Type C (QCL-C): Doppler shift and mean delay, • QCL Type D (QCL-D): Spatial reception parameters.

[0017] The assumption by the UE that one control resource set (CORESET), channel, or reference signal is in a specific QCL (e.g., QCL type D) relationship with another CORESET, channel, or reference signal may be called a QCL assumption.

[0018] The UE may determine at least one of the transmit beam (Tx beam) and receive beam (Rx beam) of a signal / channel based on the TCI state or QCL assumption of the signal / channel.

[0019] The TCI state may, for example, be information regarding the QCL between the target channel (in other words, the reference signal (RS) for that channel) and another signal (e.g., another RS). The TCI state may be set (indicated) by upper-layer signaling, physical layer signaling, or a combination thereof.

[0020] Physical layer signaling may include, for example, Downlink Control Information (DCI).

[0021] The channel on which the TCI state or spatial relationship is set (specified) may be, for example, at least one of the following: Physical Downlink Shared Channel (PDSCH), Physical Downlink Control Channel (PDCCH), Physical Uplink Shared Channel (PUSCH), or Physical Uplink Control Channel (PUCCH).

[0022] Furthermore, the RS that has a QCL relationship with the channel may be at least one of the following: a Synchronization Signal Block (SSB), a Channel State Information Reference Signal (CSI-RS), a Sounding Reference Signal (SRS), a Tracking CSI-RS (also called a Tracking Reference Signal (TRS)), or a QCL detection reference signal (also called a QRS).

[0023] An SSB is a signal block that includes at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). An SSB may also be called an SS / PBCH block.

[0024] The RS of a QCL type X in a TCI state may also mean the RS in the relationship between a channel / signal (or its DMRS) and a QCL type X, and this RS may also be called the QCL source of the QCL type X in that TCI state.

[0025] (Initial access procedure) In the initial access procedure, the UE (RRC_IDLE mode) receives the SS / PBCH block (SSB), sends Msg.1 (PRACH / Random Access Preamble / Preamble), receives Msg.2 (PDCCH, PDSCH including Random Access Response (RAR)), sends Msg.3 (PUSCH scheduled by the RAR UL grant), and receives Msg.4 (PDCCH, PDSCH including UE contention resolution identity). Subsequently, when the base station (network) sends an ACK to Msg.4 from the UE, the RRC connection is established (RRC_CONNECTED mode).

[0026] SSB reception includes PSS detection, SSS detection, PBCH-DMRS detection, and PBCH reception. PSS detection involves detecting part of the physical cell ID (PCI), detecting (synchronizing) OFDM symbol timing, and (coarse) frequency synchronization. SSS detection includes detecting the physical cell ID. PBCH-DMRS detection includes detecting part of the SSB index within a half-radio frame (5ms). PBCH reception includes detecting the system frame number (SFN) and radio frame timing (SSB index), receiving configuration information for receiving remaining minimum system information (RMSI, SIB1), and determining whether the UE can camp in that cell (carrier).

[0027] SSB has a bandwidth of 20 RB and a duration of 4 symbols. The transmission period for SSB can be set from {5, 10, 20, 40, 80, 160} ms. Within a half frame, multiple symbol positions for SSB are defined based on the frequency range (FR1, FR2).

[0028] A PBCH has a 56-bit payload. N repetitions of the PBCH are transmitted within an 80ms period. N depends on the SSB transmission period.

[0029] System information consists of MIBs carried by PBCH, RMSI (SIB1), and other system information (OSI). SIB1 contains information for RACH configuration and RACH procedures. The time / frequency resource relationship between SSB and PDCCH monitoring resources for SIB1 is set by PBCH.

[0030] A base station using beam correspondence transmits multiple SSBs using multiple beams during each SSB transmission cycle. Each of the multiple SSBs has multiple SSB indices. When a UE detects one SSB, it transmits a PRACH in the RACH occasion associated with that SSB index and receives a RAR in the RAR window.

[0031] (Beam and coverage) In the high-frequency band, if beamforming is not applied to the synchronization / reference signal, coverage becomes narrow, making it difficult for the UE to find the base station. On the other hand, if beamforming is applied to the synchronization / reference signal to ensure coverage, a strong signal will reach in a specific direction, but the signal will be even weaker in other directions (Figure 1A). If the direction of the UE is unknown at the base station before the UE connects, it is impossible to transmit the synchronization / reference signal using a beam only in the appropriate direction. One possible method is for the base station to transmit multiple synchronization / reference signals, each with a beam in a different direction, and for the UE to recognize which beam it has detected. Using a narrow beam for coverage requires transmitting many synchronization / reference signals, which increases overhead and may reduce frequency utilization efficiency.

[0032] Using wider beams (wider beams) to reduce the number of beams (synchronization / reference signals) and thus lower overhead results in narrower coverage (Figure 1B).

[0033] In future wireless communication systems (e.g., 6G), the use of frequency bands such as millimeter waves and terahertz waves is expected to increase further. It is conceivable that communication services could be provided by constructing cell area / coverage using numerous narrow beams.

[0034] Possible approaches include expanding the area using existing FR2 beams and utilizing higher frequency bands than existing FR2 beams. To achieve these goals, improvements in beam management are preferable, in addition to multi-TRP and reconfigurable intelligent surface (RIS) systems.

[0035] In current 5G NR systems, the maximum number of synchronous signal blocks (SSBs) is 64. Because a maximum of 64 beams are needed to cover the cell area (surface), it is difficult to use narrow beams. To utilize a large number of narrow beams, the following beam management methods 1 and 2 are possible.

[0036] [Beam Management Method 1] Using more than 64 SSBs (the maximum number of SSBs exceeds 64). Simply increasing the number of SSBs may increase SSB overhead / initial access latency.

[0037] [Beam Management Method 2] Use up to 64 SSBs (the maximum number of SSBs is 64). Reduce the area (surface) covered by a single cell / sector. Inter-cell / sector interference and high-speed / frequent handovers between cells / sectors may become problems.

[0038] Therefore, the inventors devised a method to suppress overhead / initial access delay.

[0039] The embodiments of this disclosure will be described in detail below with reference to the drawings. Each wireless communication method according to the embodiments may be applied individually or in combination.

[0040] In this disclosure, "A / B" and "at least one of A and B" may be interpreted as mutually exclusive. In this disclosure, "A / B / C" may mean "at least one of A, B, and C".

[0041] In this disclosure, terms such as activate, deactivate, indicate, select, configure, update, and determine may be interpreted interchangeably. In this disclosure, terms such as support, control, controllable, operate, and operable may be interpreted interchangeably.

[0042] In this disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher-layer parameters, information elements (IE), settings, etc., may be interpreted interchangeably. In this disclosure, Medium Access Control elements (MAC Control Element (CE)), update commands, activation / deactivation commands, etc., may be interpreted interchangeably.

[0043] In this disclosure, the upper-layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.

[0044] In this disclosure, MAC signaling may include, for example, MAC Control Elements (MAC CEs) and MAC Protocol Data Units (PDUs). Broadcast information may include, for example, Master Information Blocks (MIBs), System Information Blocks (SIBs), Remaining Minimum System Information (RMSIs), and Other System Information (OSIs).

[0045] In this disclosure, physical layer signaling may include, for example, Downlink Control Information (DCI) and Uplink Control Information (UCI).

[0046] In this disclosure, terms such as index, identifier (ID), indicator, and resource ID may be interpreted interchangeably. In this disclosure, terms such as sequence, list, set, group, cluster, and subset may be interpreted interchangeably.

[0047] In this disclosure, the terms used include: panel, UE panel, panel group, beam, beam group, precoder, Uplink (UL) transmit entity, Transmission / Reception Point (TRP), base station, Spatial Relation Information (SRI), spatial relationship, SRS Resource Indicator (SRI), Control Resource Set (CORESET), Physical Downlink Shared Channel (PDSCH), Codeword (CW), Transport Block (TB), Reference Signal (RS), antenna port (e.g., Demodulation Reference Signal (DMRS) port), antenna port group (e.g., DMRS port group), group (e.g., spatial relationship group, Code Division Multiplexing (CDM) group, reference signal group, CORESET group, Physical Uplink Control Channel (PUCCH) groups, PUCCH resource groups, resources (e.g., reference signal resources, SRS resources), resource sets (e.g., reference signal resource sets), CORESET pools, downlink Transmission Configuration Indication state (TCI state) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, quasi-co-location (QCL), QCL assumptions, etc., may be interpreted interchangeably.

[0048] In this disclosure, the SSB / CSI-RS index / indicator and beam index may be interpreted as interchangeable.

[0049] (Wireless communication method) In each embodiment, SSB, CSI-RS, DL-RS, beam, and TCI state may be interchangeable.

[0050] In each embodiment, the terms period, frame, subframe, slot, and symbol may be interchangeable.

[0051] In each embodiment, the group, set, SSB / CSI-RS to be measured, specific SSB / CSI-RS, and specific reference signal (RS) may be interchangeable.

[0052] In each embodiment, the number of SSB / CSI-RS may be different from the number of existing SSB / CSI-RS, may be greater than the number of existing SSB / CSI-RS, or may be greater than 64.

[0053] <First Embodiment> This embodiment relates to an SSB configuration.

[0054] 《Aspect 1-1》 This embodiment relates to the multiplexing of multiple SSBs. Multiple SSBs may be transmitted periodically. Different beams may be applied to multiple SSBs.

[0055] [Multiple method 1a] Multiple SSBs may be subjected to time division multiplexing (TDM).

[0056] As shown in the example in Figure 2A, SSB#0 to SSB#192 may be TDM.

[0057] The drawings of each embodiment show portions where the time interval between multiple SSB / CSI-RS is constant and portions where it is not, but the time interval between multiple SSB / CSI-RS is not limited to these examples. The time interval between multiple SSB / CSI-RS may be constant or it may not be constant.

[0058] [Multiple method 2a] Multiple SSBs may be subjected to TDM / frequency division multiplexing (FDM) / code division multiplexing (CDM) / space division multiplexing (SDM).

[0059] As shown in the example at the bottom of Figure 2B, SSB#0 to SSB#63 may be TDM, SSB#64 to SSB#127 may be TDM, and SSB#128 to SSB#191 may be TDM. SSB#0 to SSB#63, SSB#64 to SSB#127, and SSB#128 to SSB#191 may be FDM. Here, FDM / CDM / SDM may be used instead of FDM.

[0060] Multiplexing method 2a has a shorter cycle and higher resource utilization efficiency compared to multiplexing method 1a.

[0061] The periods of all SSB / CSI-RS signals may be the same as or different from the SSB / CSI-RS periods specified in existing specifications.

[0062] Multiple SSBs may be grouped together. SSBs belonging to different groups may share the same index. In this case, the SSBs may be identified by a group index and an SSB index. SSBs belonging to different groups may have different indexes. In this case, the SSBs may be identified by an SSB index.

[0063] [Multiple method 1b] Multiple SSBs that have been TDM-decoded may be grouped together. A group index may be given, ordered in ascending order of time for each group.

[0064] As shown in the example in Figure 3A, each of the groups (SSB groups) #0, #1, and #2 may contain TDM-processed SSBs #0 through SSB #63. Groups #0, #1, and #2 may be TDM-processed. Groups #0, #1, and #2 may contain different SSBs. For example, group #1 may contain TDM-processed SSBs #64 through SSB #127, and group #2 may contain TDM-processed SSBs #128 through SSB #191.

[0065] In the examples of drawings for each embodiment, the time intervals between groups are constant, but the time intervals between groups are not limited to these examples. The time intervals between groups may be constant or not.

[0066] [Multiple method 2b] Multiple SSBs that have been processed using TDM / FDM / CDM / SDM may be grouped together. When multiple groups are processed using FDM, the group index may be given in ascending order of the group frequencies, or in descending order of the group frequencies.

[0067] As shown in the example in Figure 3B, each of groups #0, #1, and #2 may contain TDM-processed SSBs #0 through #63. Groups #0, #1, and #2 may be FDM-processed. Here, FDM / CDM / SDM may be used instead of FDM. Groups #0, #1, and #2 may contain different SSBs. For example, group #1 may contain TDM-processed SSBs #64 through #127, and group #2 may contain TDM-processed SSBs #128 through #191.

[0068] The group period may be the same as or different from the SSB / CSI-RS period specified in the existing specifications.

[0069] 《Aspect 1-2》 This aspect relates to the operation of receiving / measuring / detecting SSB.

[0070] [Aspect 1-2-1] The UE may receive / measure / detect multiple SSBs using the same symbol.

[0071] For example, a UE that has multiple receiving panels and supports the operation of simultaneously receiving / measuring / detecting the RS of different DL beams using multiple panels (and has reported support for this operation through UE capability signaling) may be capable of this operation.

[0072] [[Receiving operation A]] This UE (Unified Element) may perform SSB reception / measurement / detection only during certain periods (e.g., period #1), and not perform SSB reception / measurement / detection during other periods (e.g., periods #2, #3) (Figure 4). This operation reduces the power consumption required for SSB reception / measurement / detection.

[0073] According to the scheduling restrictions defined in the existing specifications, a PDSCH using a different QCL type D than that SSB / CSI-RS cannot be scheduled for the same symbol as that SSB / CSI-RS. Due to this restriction, a PDSCH cannot be scheduled for symbols that overlap with SSBs other than those using the same beam. In receive operation A, the specification may specify that there are no scheduling restrictions in periods #2 / #3. In this case, the network can schedule PDSCHs in periods #2 and #3 without worrying about overlapping with SSBs in the time domain (same symbol), thus improving throughput / frequency utilization efficiency. The periods in which the UE receives / measures / detects SSBs and periods in which it does not may be specified in the specifications or configured by higher-layer signaling.

[0074] [[Receiving operation B]] This UE may receive / measure / detect SSB for the entire duration that SSB is transmitted (e.g., from period #1 to #3) (Figure 5). This UE may not receive / measure / detect SSB for some periods (e.g., periods #2 and #3).

[0075] This operation improves the accuracy of SSB reception / measurement / detection compared to reception operation A. Compared to embodiment 1-1, the base station can reduce the delay required for reception / measurement / detection of all SSB signals.

[0076] [Aspect 1-2-2] The specification may stipulate that the UE will not receive / measure / detect multiple SSBs under the same symbol.

[0077] For example, a UE may be defined as not performing the operation of having multiple receiving panels and not supporting the operation of simultaneously receiving / measuring / detecting the RS of different DL beams using multiple panels (and not reporting support for this operation through UE capability signaling).

[0078] This UE may receive / measure / detect SSB signals from group #0 during period #1, receive / measure / detect SSB signals from group #1 during period #2, and receive / measure / detect SSB signals from group #2 during period #3 (frequency hopping of the SSB groups to be measured is also possible).

[0079] UEs (including Rel.15 / 16 UEs) that cannot receive different DL RS signals of QCL type D on the same symbol can, as in Rel.15, use one QCL type D RS signal on a given symbol to receive / measure / detect SSB signals, even if the SSB signal is FDM / CDM / SDM. This simplifies UE operation. Under the existing specifications, due to the aforementioned scheduling limitations, it is not possible to schedule PDSCH signals on the same symbol as an SSB signal, resulting in the symbol not being used effectively. However, by FDM / CDM / SDMing another SSB signal to that symbol, the symbol can be used more efficiently.

[0080] The UE may hop through the frequencies, codes, and spaces of the SSB / group being measured, period by period, frame by frame, subframe by slot by symbol. The correspondence between the periods being measured and the SSB / groups (hopping method) may be specified in the specification, set by higher-layer signaling, or depend on the UE implementation.

[0081] The specification may define an expression or function for determining the index of a group / SSB for each period / frame / subframe / slot / symbol. The index of the group / SSB may also be a function of the index of the period / frame / subframe / slot / symbol.

[0082] The index of the SSB / group being measured may be changed for each period / frame / subframe / slot / symbol. For example, the group index may be mod(period index * m, number of groups), where m can be 1 or more.

[0083] As shown in the example in Figure 6, the UE may hop through the groups to be measured for each symbol. In this case, the index of the groups to be measured may be a function of the symbol index.

[0084] 《Aspects 1-3》 The SSB / CSI-RS period may be defined / set using a first period and a second period.

[0085] As shown in the example in Figure 7, only the first period may be specified / set, and the second period may be the first period multiplied by the number of groups. The number of groups may be specified in the specifications, notified / broadcast by MIB / SIB / PBCH etc., blindly detected by UE, or set by RRC IE.

[0086] The first period may be the same as, or different from, the SSB / CSI-RS period (transmission period) specified in existing standards.

[0087] The time between the indication of the TCI status and its application may be determined based on the second cycle.

[0088] According to this embodiment, the UE can properly receive, measure, and detect SSB.

[0089] <Second Embodiment> This embodiment relates to the SSB / CSI-RS of the object to be measured.

[0090] In Rel.15, the UE measures all configured / specified SSBs and reports / uses the beam with the best measurement result. When transmitting on a random access channel (RACH), the UE transmits the PRACH on the physical random access channel (PRACH) occasion corresponding to the SSB with the highest received power. In the layer 1 (L1) beam report after RRC connection is established, the UE reports to the base station the 1 / 2 / 4 SSB resource indicators (SSBRI) / CSI-RS resource indicators (CRI) with the best L1-reference signal received power (RSRP) / L1-signal-to-interference and noise ratio (SINR) from the configured SSBs / CSI-RS, along with the L1-RSRP / L1-SINR values.

[0091] As the number of beams increases, searching all beams becomes time-consuming and inefficient. Due to differences in beam switching, and the expectation that beams will switch from the currently used beam to a nearby beam, the UE does not need to search all beams. For example, in the example in Figure 8, among the SSBs #0 to #16 within the coverage area of ​​TRP (cell) #1, it can be expected that the beam of SSB #9, which is currently in use, will switch to one of the surrounding SSBs #4, #5, #6, #8, #10, #13, #14, or #15.

[0092] The UE may select a specific SSB / CSI-RS from all (configured / specified) SSB / CSI-RS and perform reception / measurement / detection of that specific SSB / CSI-RS.

[0093] The triggers for receiving / measuring / detecting SSB / CSI-RS may be at least one or all of the following: when measuring / reporting L1-RSRP / L1-SINR / L3-RSRP / L3-SINR, when determining the PRACH occasion for PRACH transmission, when determining a new beam RS in the BFR, and when measuring for event-based beam reporting. The UE may report the top X indices of the measured SSB / CSI-RS to the base station.

[0094] The current (in-use) SSB / CSI-RS index may be the TCI state / spatial relationship set for the current PDCCH / PDSCH / PUCCH / PUSCH / SRS / CSI-RS, the TCI state set for PDCCH, the DL TCI state or joint TCI state set for a unified TCI state (common TCI state), or the SSB / CSI-RS index (SSBRI / CRI) corresponding to the best beam index reported by the L1-RSRP / L1-SINR beam report.

[0095] The selection method for a particular SSB / CSI-RS may follow at least one of the following selection methods 1 and 2.

[0096] 《Selection Method 1》 The correspondence (association, the relationship of state transitions from the current SSB / CSI-RS index to the SSB / CSI-RS index to be measured) between the current SSB / CSI-RS index and the SSB / CSI-RS index to be measured may be notified / configured. In the example in Figure 9, the correspondence may indicate the association of each current SSB / CSI-RS index to one or more SSB / CSI-RS indexes to be measured.

[0097] When determining whether to perform a beam switch, the UE may determine whether the measurement result of the SSB / CSI-RS under measurement is better or worse than the measurement result of the current SSB / CSI-RS. Even if the index of the SSB / CSI-RS under measurement is not explicitly notified, the index of the SSB / CSI-RS under measurement may include the index of the current SSB / CSI-RS. However, when determining the new beam RS in BFR, the index of the current SSB / CSI-RS corresponds to a failed beam and therefore does not need to be included in the index of the SSB / CSI-RS under measurement.

[0098] 《Selection Method 2》 The UE may determine the index of the SSB / CSI-RS being measured (specifically) (or multiple SSB / CSI-RS indices) from the current SSB / CSI-RS index according to the rules. The rules may be at least one of the following rules 1 to 4.

[0099] [Rule Break] When a group is defined in the first embodiment, the index of the SSB / CSI-RS to be measured may be all SSB / CSI-RS indices in the group that includes the current SSB / CSI-RS index, or it may be the SSB / CSI-RS indices in that group excluding the current SSB / CSI-RS index. In the example in Figure 10A, the current SSB#1 is included in group#1. The UE may select SSB#0 to SSB#63 from the same group#1 as the current SSB as the index to be measured.

[0100] By limiting the number of SSBs to be measured to a specific number or less within a single period / cycle, the UE can receive / measure / detect all SSBs to be measured within that period / cycle. The specific number may be the number of SSBs within a single group.

[0101] The number of SSBs to be measured does not need to be limited to a specific number of SSBs within a single period / cycle. In this case, the UE may receive one SSB on the same symbol and receive / measure / detect all SSBs to be measured over multiple periods / cycles, or it may use multiple panels to receive multiple SSBs on the same symbol and receive / measure / detect all SSBs to be measured within a single period / cycle.

[0102] [Rule 2] The SSB / CSI-RS index to be measured may be a certain number of SSB / CSI-RS indices before and after the current SSB / CSI-RS index, or a certain number of SSB / CSI-RS indices within the range including the current SSB / CSI-RS index. For example, if the current SSB / CSI-RS index is m and the number of SSB / CSI-RS indices to be measured is N, the range of the SSB / CSI-RS indices to be measured may be N SSB / CSI-RS indices from SSB / CSI-RS index m-floor(N / 2) to SSB / CSI-RS index m+ceil(N / 2)-1.

[0103] The formula for calculating the index of the SSB / CSI-RS being measured is not limited to this formula. The index of the SSB / CSI-RS being measured may be the N+1 SSB / CSI-RS indices (centered on the current SSB / CSI-RS index m) from the SSB / CSI-RS index m-floor(N / 2) to the SSB / CSI-RS index m+ceil(N / 2), or it may be the N SSB / CSI-RS indices (centered on the current SSB / CSI-RS index m) from the N+1 SSB / CSI-RS indices (centered on the current SSB / CSI-RS index m) from the SSB / CSI-RS index m-floor(N / 2) to the SSB / CSI-RS index m+ceil(N / 2), excluding the current SSB / CSI-RS index m. Also, floor / ceil / round may be used instead of floor / ceil. If a distance D is set from the current SSB / CSI-RS index m, the SSB / CSI-RS index to be measured may be 2D+1 SSB / CSI-RS indices (centered on the current SSB / CSI-RS index m) from SSB / CSI-RS index mD to SSB / CSI-RS index m+D, or it may be 2D SSB / CSI-RS indices (centered on the current SSB / CSI-RS index m) from SSB / CSI-RS index mD to SSB / CSI-RS index m+D, excluding the current SSB / CSI-RS index m. The SSB / CSI-RS index to be measured may also be indices at a specific interval (e.g., 2) (centered on the current SSB / CSI-RS index m).

[0104] To avoid the SSB / CSI-RS index p obtained by the calculation formula exceeding or becoming negative for the SSB / CSI-RS index Q, the SSB / CSI-RS index of the measured object may be given by mod(p,Q).

[0105] SSB groups do not necessarily have to be used. In the example in Figure 10B, if SSB#0 to #191 are transmitted, the current SSB is SSB#65, and the number of SSBs to be measured N is 5, then the SSBs to be measured may be SSB#63 to #67.

[0106] The indices of the SSB / CSI-RS being measured may be non-contiguous. For example, the indices of the SSB / CSI-RS being measured may be every other number.

[0107] [Rule 3] The SSB / CSI-RS being measured may be adjacent on the time axis and adjacent to the current SSB / CSI-RS on the frequency axis (SSB / CSI-RS surrounding / adjacent to the current SSB / CSI-RS in the time-frequency plane). In the example in Figure 11A, groups #0 to #2 are transmitted, and each of groups #0 to #2 includes SSB #0 to #63. The current SSB is SSB #1 of group #1, and the SSB being measured includes SSB #0 to #2 of group #0, SSB #0 to #2 of group #1, and SSB #0 to #2 of group #2.

[0108] In this case, the SSB to be measured may include multiple SSBs within the same symbol. In this case, the UE may receive one SSB within the same symbol and receive / measure / detect all SSBs within the measured range over multiple periods / cycles, or it may use multiple panels to receive multiple SSBs within the same symbol and receive / measure / detect all SSBs within the measured range in one period / cycle.

[0109] [Rule 4] The SSB / CSI-RS to be measured may be determined based on adding n to the time-direction index of the current SSB / CSI-RS and adding m to the frequency-direction index of the current SSB / CSI-RS. In the example in Figure 11B, SSB#0 through #191 are transmitted, with n=1 and m=1. The current SSB is SSB#0, and the next SSB to be measured is SSB#65, obtained by adding 1 to the time-direction index and 1 to the frequency-direction index. The next SSB to be measured is SSB#131, obtained by adding 1 to the time-direction index and 1 to the frequency-direction index.

[0110] According to this embodiment, the UE can appropriately determine the SSB / CSI-RS of the measurement target.

[0111] <Third Embodiment> This embodiment relates to switching the object to be measured.

[0112] Operation A (Figure 12B), which receives, measures, and detects all configured SSB / CSI-RS signals, and Operation B (Figure 12A), which receives, measures, and detects a specific SSB / CSI-RS signal from among the configured SSB / CSI-RS signals, may be switched between. The second embodiment may be applied to Operation B.

[0113] Switching from operation A to operation B avoids unnecessary SSB / CSI-RS reception / measurement / detection, reducing the time / delay associated with SSB / CSI-RS reception / measurement / detection. By refraining from SSB / CSI-RS reception / measurement / detection during certain periods, scheduling limitations can be avoided, increasing throughput.

[0114] In the examples in Figures 13A and 13B, groups #0 to #2 are transmitted. Each of groups #0 to #2 contains SSB #0 to SSB #63. Figure 13A shows an example of operation B. The UE selects group #1 as the measurement target from the configured groups #0 to #2 and performs reception / measurement / detection only for group #1. This allows the UE to complete the reception / measurement / detection of all SSBs #0 to #63 in only one of the periods #1 to #3, thereby minimizing measurement delay. Figure 13B shows an example of operation A. The UE can complete the reception / measurement / detection of all SSBs in the configured groups #0 to #2 over periods #1 to #3.

[0115] The switching between operations A and B may follow at least one of the following switching methods 1 to 3.

[0116] Switching Method 1 Switching may also be performed by instructions from the base station (RRC IE / MAC CE / DCI).

[0117] The specification may include an RRC IE / MAC CE that notifies the index of the SSB / CSI-RS being measured.

[0118] A specific field within the DCI that has a field (e.g., a CSI request field) that triggers an aperiodic CSI (A-CSI) such as DCI format 0_0 / 0_1 / 0_2 may be used to instruct the switch. The specific field may conform to at least one of the following fields 1 and 2.

[0119] [Field 1] When configured by upper-layer signaling, the DCI may include a specific field for switching.

[0120] [Field 2] A specific field may be a field that triggers A-CSI. The field that triggers A-CSI may indicate an indicator index = {0, 1}, where 0 indicates action A and 1 indicates action B, or vice versa.

[0121] At least one of the following may be specified in the specification or set by upper-layer signaling: the correspondence between the value (code point) of the field that triggers A-CSI and the indicator index, and the correspondence between the A-CSI triggering state and the indicator index. In the example in Figure 14, the value of the field that triggers A-CSI, the A-CSI triggering state, and the indicator index are associated. The UE may determine at least one of the A-CSI triggering state and the indicator index from the value of the field that triggers A-CSI according to this association.

[0122] Switching Method 2 The switching may be conditional. For example, if a condition is met, the UE may perform action B, and if that condition is not met, the UE may perform action A. That condition may include at least one of the following action B conditions 1 to 3.

[0123] [Operation B condition 1] The condition may be that the current SSB / CSI-RS reception / measurement / detection results / quality are good. Good results may mean that the results are above (or higher than) a threshold. The results may be RSRP / SINR / RSRQ.

[0124] [Operation B condition 2] The condition may be that the top X results of reception / measurement / detection in operation B are good. Good results may mean that the results are above (or higher than) a threshold. The results may be RSRP / SINR / RSRQ. The value of X may be set by upper-layer signaling or specified in the specification. If the value of X is not set, the value of X may be a specific value. The specific value may be 1 or more than 1.

[0125] [Operation B condition 3] The condition may also be that a parameter relating to the movement speed of the UE is below (or lower than) a threshold. This parameter may be the Doppler shift, the number of handovers within a specific period, or the number of beams that have been changed in the L1 / L3 beam reports (reports of the top X beams) within a specific period (the number of beams in the report that are different from the beam in the report immediately preceding it).

[0126] Switching Method 3 The switching may be conditional. For example, if a condition is met, the UE may perform action A, and if that condition is not met, the UE may perform action B. That condition may include at least one of the following action A conditions 1 to 3.

[0127] [Operation Condition A 1] The condition may be that the current SSB / CSI-RS reception / measurement / detection result / quality is poor. A poor result may be that the result is below (or lower than) a threshold. The result may be RSRP / SINR / RSRQ.

[0128] [Operation Condition A 2] The condition may be that the top X results in operation B are bad. A bad result may be that the result is below (or lower than) a threshold. The result may be RSRP / SINR / RSRQ. The value of X may be set by upper-layer signaling or specified in the specification. If the value of X is not set, the value of X may be a specific value. The specific value may be 1 or greater than 1.

[0129] [Operation Condition A 3] The condition may also be that a parameter relating to the movement speed of the UE is above (or higher than) a threshold. This parameter may be the Doppler shift, the number of handovers within a specific period, or the number of beams that have been changed in the L1 / L3 beam reports (reports of the top X beams) within a specific period (the number of beams in the report that are different from the beam in the report immediately preceding it).

[0130] In this embodiment, the switching between operations A and B has been described, but the operations that can be switched are not limited to these two. For example, the UE may receive / measure / detect a specific X of the configured SSB / CSI-RS, and the switching method in this embodiment may be applied to switching the value of X. For example, the switching method in this embodiment may be applied to switching between X=32 and X=64. For example, the switching method in this embodiment may be applied to switching between X=32, X=64 and X=192 (all SSB / CSI-RS, operation A). If the number of switchable operations is greater than two, the size (number of bits) of the indicator index may be two bits or more.

[0131] According to this embodiment, the UE can appropriately switch the number of SSB / CSI-RS signals being measured.

[0132] <Fourth Embodiment> This embodiment relates to switching between beam types / groups / widths / numbers.

[0133] The reception / measurement / detection operations of Group A of SSB / CSI-RS covering a certain TRP / cell area (coverage area, service area, coverage) may be switched between those operations and those of Group B of SSB / CSI-RS covering the same service area. The beam used for Group B may be narrower (thinner) than the beam used for Group A. The number of SSB / CSI-RS in Group B may be greater than the number of SSB / CSI-RS in Group A.

[0134] In the example in Figure 15A, SSB group A is transmitted. The beams used for the five SSBs in group A (SSB#0 to SSB#4) cover the coverage area of ​​TRP(cell)#1. In the example in Figure 15B, SSB group B is transmitted. The beams used for the 17 SSBs in group B (SSB#0 to SSB#16) cover the coverage area of ​​TRP(cell)#1.

[0135] In the example in Figure 16A, group #0 corresponds to group A. The UE receives / measures / detects group #0 in each of periods #1 to #3. In the example in Figure 16B, groups #1 and #2 correspond to group B. The UE receives / measures / detects group #1 in periods #1, #3, ... and receives / measures / detects group #2 in periods #2, #4, ...

[0136] Similar to Group A, the area of ​​a single cell may be covered by multiple SSBs (beams used for them) within Group #0. Similar to Group B, the area of ​​a single cell may be covered by multiple SSBs (beams used for them) within groups other than Group #0 (Groups #1, #2).

[0137] The SSB within Group A may also be the SSB of Rel. 15.

[0138] The switching method / conditions of the third embodiment may be applied to switching between Group A and Group B. Switching may be performed by instructions from the base station (RRC IE / MAC CE / DCI). Switching may also be conditional. For example, if the condition is met, the UE may use Group B, and if the condition is not met, the UE may use Group A.

[0139] The conditions for using Group B may include at least one of the following Group B conditions 1 or 2.

[0140] [Group B Condition 1] The condition may be that there are instructions / settings from the base station regarding group B. If there are no instructions from the base station, the UE may perform reception / measurement / detection only for group A. If there are instructions / settings from the base station regarding group B, the UE may perform reception / measurement / detection of group B in addition to reception / measurement / detection of group A. In this case, the quality can be improved compared to receiving / measurement / detection of group A only. The UE may perform a two-stage beam sweep. The first stage beam sweep may be reception / measurement / detection of group A. The second stage beam sweep may be reception / measurement / detection of group B.

[0141] [Group B Condition 2] The condition may also be that there are no results / quality of reception / measurement / detection of SSB / CSI-RS within Group A that are above (or higher than) the threshold. The result may be RSRP / SINR / RSRQ. If there are no results / quality of reception / measurement / detection of SSB / CSI-RS within Group A that are above (or higher than) the threshold, the UE may perform reception / measurement / detection of Group B.

[0142] For example, in L1-RSRP / L1-SINR beam reporting, the UE may basically perform reception / measurement / detection for group A and report the SSBRI / CRI and L1-RSRP / L1-SINR for group A. If the conditions are met, the UE may also perform reception / measurement / detection for group B and report the SSBRI / CRI and L1-RSRP / L1-SINR for group B.

[0143] The triggers for receiving / measuring / detecting SSB / CSI-RS may be at least one or all of the following: when measuring L1-RSRP / L1-SINR / L3-RSRP / L3-SINR, when determining the PRACH occasion for PRACH transmission, when determining a new beam RS in the BFR, and when measuring for event-based beam reporting. The UE may report to the base station the top X indices of the measured SSB / CSI-RS indices of the measured target (at least one of groups A and B) based on the measurement results.

[0144] In the initial access procedure / random access procedure, the UE may receive / measure / detect SSBs within group A. In the initial access procedure / random access procedure, if the conditions are met, the UE may use group B; otherwise, the UE may use group A.

[0145] The initial access procedure / random access procedure may follow at least one of the following PRACH1 to 3.

[0146] [PRACH1] The occasion / preamble of the PRACH corresponding to an SSB in Group A may be different from the occasion / preamble of the PRACH corresponding to an SSB in Group B. This allows the base station to know which SSB, Group A or Group B, the UE measured when receiving the PRACH.

[0147] [PRACH2] The occasion / preamble of PRACH corresponding to an SSB in group A may be equal to the occasion / preamble of PRACH corresponding to an SSB in group B. This allows the number of occasion / preambles required for PRACH to be roughly the same as the number of SSBs in group A, thereby improving resource utilization efficiency.

[0148] [PRACH3] The occasions for PRACH corresponding to SSBs in Group A may be the same as those for SSBs in Group B. Conversely, the preamble for PRACH corresponding to SSBs in Group A may be different from the preamble for PRACH corresponding to SSBs in Group B. This allows the number of PRACH occasions required to be roughly the same as the number of SSBs in Group A, thereby improving resource utilization efficiency. Furthermore, when a PRACH is received, the base station can determine, based on the preamble, whether the UE measured an SSB from Group A or Group B.

[0149] This embodiment describes switching between groups A and B, but the groups that can be switched are not limited to these two groups. The switching method in this embodiment may be applied to switching between group A and all groups including group A (groups A and B), or between group A and all groups including group A (groups A and B), or between group A and multiple groups including group A (e.g., groups #0 and #1, or groups #0 and #2), or between two or more groups (e.g., at least two of group #0, group #1, group #2, groups #0 and #1, groups #0 and #2, groups #1 and #2, or groups #0, #1 and #2). Here, the quality of group A is not necessarily worse than the quality of group B. The index of group A (the group used for default reception / measurement / detection, the group with a small number of SSB / CSI-RS signals, the group using a wide beam) is set to 0, but it does not have to be 0.

[0150] According to this embodiment, the UE can appropriately switch between groups / beams / numbers / areas of the SSB / CSI-RS being measured.

[0151] <Fifth Embodiment> This embodiment relates to a method for notifying / setting / instructing / reporting SSB / CSI-RS indexes.

[0152] When a base station sets / notifies the UE of an SSB index (for QCL source RS, PL-RS, PRACH triggered by PDCCH order, etc.), or when reporting SSBRI / CRI in L1 beam reports within the UCI, if the number of SSB / CSI-RS is greater than 64, the index cannot be notified by the existing 6 bits. This is particularly problematic when MAC CE / DCI notifies the SSB index, or when UCI notifies the index (SSBRI / CRI).

[0153] The method for notifying SSB / CSI-RS indexes may follow at least one of the following notification methods 1 to 3.

[0154] 《Notification method 1》 The number of bits (field size) for notifying / indicating / setting / reporting the SSB / CSI-RS index may be greater than the existing number of bits for notifying / indicating / setting / reporting the SSB / CSI-RS index. In MAC CE / DCI / UCI / RRC IE, the size of the field notifying the SSB / CSI-RS index may be greater than 6 bits. If more than 64 SSBs are configured to be received / measured / detected, the size of the field notifying the SSB index may be greater than 6 bits. In MAC CE / DCI / UCI / RRC IE, the size of the field notifying the SSB / CSI-RS index may be variable depending on the number of configured SSB / CSI-RS (may depend on the number of configured SSB / CSI-RS).

[0155] 《Notification method 2》 The upper X bits (or lower X bits) of the SSB / CSI-RS index may indicate a group index. For example, the upper X bits (or lower X bits) of the SSB / CSI-RS index may indicate a group index, and the other Y bits may indicate the index of the SSB / CSI-RS within that group. At least one of X and Y may be set by upper-layer signaling or specified in the specification. The UE may determine X based on the number of groups set. The UE may determine Y based on the number of SSB / CSI-RS within a set group.

[0156] The most significant bit (MSB) or least significant bit (LSB) of the SSBRI / CRI field indicates whether the index indicated by that field is for SSB or CSI-RS, and the remaining bits may indicate at least one of the group index and the SSB / CSI-RS index.

[0157] 《Notification method 3》 The number of bits (field size) for notifying / indicating / setting / reporting an SSB / CSI-RS index may be the same as the number of bits for notifying / indicating / setting / reporting an existing SSB / CSI-RS index. Group indexes may be implicitly indicated (the UE may determine the group index based on the notified information). If the maximum number of SSBs is 64, the number of bits for notifying / indicating / setting / reporting an SSB / CSI-RS index may be 6 bits. The number of bits for notifying / indicating / setting / reporting an SSB / CSI-RS index is not limited to this number.

[0158] [Notification method 3-1] The number of bits (field size) for notifying / indicating / setting / reporting an SSB / CSI-RS index may be the same as the number of bits for notifying / indicating / setting / reporting an existing SSB / CSI-RS index. The UE may determine the group index using the SSB / CSI-RS index notified by MAC CE / DCI. The UE may implicitly notify the group index using the SSB / CSI-RS index reported by MAC CE / UCI.

[0159] [Notification method 3-2] The group index may not change as frequently as the SSB / CSI-RS index. The group index and the SSB / CSI-RS index may be notified / reported by separate MAC CE / DCI / UCI. The group index may be notified / reported at long intervals (infrequently), while the SSB / CSI-RS index may be notified / reported at short intervals (highly frequently).

[0160] The group in this embodiment may be the group in the first embodiment, or the SSB / CSI-RS being measured in the second embodiment.

[0161] According to this embodiment, SSB / CSI-RS groups / indexes can be properly notified / reported / instructed / configured.

[0162] <Other Embodiments> 《UE Ability Information / Higher Layer Parameters》 Higher layer parameters (RRC IE) / UE capabilities may be defined corresponding to the features in each of the above embodiments. The higher layer parameters may indicate whether or not to enable the feature. The UE capabilities may indicate whether or not the UE supports the feature.

[0163] A UE that has the corresponding higher-level parameter set may perform that function. It may also be stipulated that "a UE that does not have the corresponding higher-level parameter set may not perform that function (for example, according to Rel. 15 / 16)."

[0164] A UE that reports / submits UE capability indicating support for that function may perform that function. It may be stipulated that "a UE that has not reported UE capability indicating support for that function shall not perform that function (e.g., in accordance with Rel. 15 / 16)."

[0165] If the UE reports / sends a UE capability indicating support for that function, and the corresponding higher-layer parameters are set, the UE may perform that function. It may also be stipulated that "if the UE does not report / send a UE capability indicating support for that function, or if the corresponding higher-layer parameters are not set, the UE shall not perform that function (e.g., in accordance with Rel. 15 / 16)."

[0166] Which of the above multiple embodiments / options / choices / features is used may be set by higher-layer parameters, reported by the UE as UE capability, specified in the specification, or determined by the reported UE capability and the setting of the higher-layer parameters.

[0167] UE capability may indicate whether the UE supports at least one of the following features: • Receiving / measuring / detecting SSB / CSI-RS groups. UE capability may indicate the maximum number of groups supported. If the UE does not report this number, the maximum number of groups supported by that UE may be 1. • Receiving / measuring / detecting different SSB / CSI-RS signals (with different indices) for the same symbol.

[0168] Based on the above UE capabilities / higher layer parameters, the UE can achieve the above functions while maintaining compatibility with existing specifications.

[0169] (Wireless communication system) The configuration of a wireless communication system according to one embodiment of this disclosure will be described below. In this wireless communication system, communication is performed using any or a combination thereof of the wireless communication methods according to the above embodiments of this disclosure.

[0170] Figure 17 shows an example of a schematic configuration of a wireless communication system according to one embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc., as specified by the Third Generation Partnership Project (3GPP).

[0171] Furthermore, the wireless communication system 1 may support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and so on.

[0172] In EN-DC, the LTE (E-UTRA) base station (eNB) is the Master Node (MN), and the NR base station (gNB) is the Secondary Node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0173] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity where both MN and SN are NR base stations (gNB) (NR-NR Dual Connectivity (NN-DC))).

[0174] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with relatively wide coverage, and base stations 12 (12a-12c) located within the macrocell C1 that form a small cell C2 that is narrower than the macrocell C1. User terminals 20 may be located within at least one cell. The arrangement and number of each cell and user terminal 20 are not limited to the configuration shown in the figure. Hereinafter, when base stations 11 and 12 are not distinguished, they will be collectively referred to as base station 10.

[0175] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of Carrier Aggregation (CA) using multiple Component Carriers (CC) and Dual Connectivity (DC).

[0176] Each CC may be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). A macrocell C1 may be included in FR1, and a small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may fall in a frequency band higher than FR2.

[0177] Furthermore, the user terminal 20 may communicate using at least one of the following methods at each CC: Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0178] Multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.) or wireless (e.g., NR communication). For example, if NR communication is used as a backhaul between base stations 11 and 12, base station 11, which is the upstream station, may be called an Integrated Access Backhaul (IAB) donor, and base station 12, which is the relay station, may be called an IAB node.

[0179] Base station 10 may be connected to the core network 30 via other base stations 10 or directly. The core network 30 may include at least one of the following: Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0180] The user terminal 20 may be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0181] In the wireless communication system 1, an orthogonal frequency division multiplexing (OFDM)-based wireless access scheme may be used. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc., may be used in at least one of the downlink (DL) and uplink (UL).

[0182] The wireless access method may also be called a waveform. In wireless communication system 1, other wireless access methods (for example, other single-carrier transmission methods, other multi-carrier transmission methods) may be used for the UL and DL wireless access methods.

[0183] In the wireless communication system 1, a Physical Downlink Shared Channel (PDSCH), a Broadcast Channel (PBCH), or a Physical Downlink Control Channel (PDCCH) may be used as the downlink channel, shared by each user terminal 20.

[0184] Furthermore, in the wireless communication system 1, the uplink channel may include a Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), a Physical Random Access Channel (PRACH), or the like, all of which are shared by each user terminal 20.

[0185] User data, higher-layer control information, and System Information Blocks (SIBs) are transmitted via PDSCH. User data and higher-layer control information may also be transmitted via PUSCH. Furthermore, Master Information Blocks (MIBs) may be transmitted via PBCH.

[0186] Lower-layer control information may be transmitted by PDCCH. The lower-layer control information may include, for example, Downlink Control Information (DCI) which includes scheduling information for at least one of PDSCH and PUSCH.

[0187] Furthermore, the DCI that schedules PDSCH may be called a DL assignment or DL ​​DCI, and the DCI that schedules PUSCH may be called a UL grant or UL DCI. Furthermore, PDSCH may be interpreted as DL data, and PUSCH may be interpreted as UL data.

[0188] PDCCH detection may utilize a Control Resource Set (CORESET) and a search space. A CORESET corresponds to the resources used to search for DCIs. A search space corresponds to the search area and search method for PDCCH candidates. A single CORESET may be associated with one or more search spaces. The UE may monitor CORESETs associated with a particular search space based on the search space configuration.

[0189] A single search space may correspond to one or more PDCCH candidates corresponding to aggregation levels. One or more search spaces may be referred to as a search space set. In this disclosure, "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," and "CORESET configuration" may be interpreted interchangeably.

[0190] PUCCH may transmit uplink control information (UCI) which includes at least one of the following: channel state information (CSI), delivery acknowledgment (e.g., Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). PRACH may transmit a random access preamble for establishing a connection with the cell.

[0191] In this disclosure, downlinks, uplinks, etc., may be expressed without the prefix "link." Also, the prefix "physical" may be omitted when describing various channels.

[0192] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc., may be transmitted. In the wireless communication system 1, as DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc., may be transmitted.

[0193] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS / PBCH block, SS Block (SSB), etc. SS, SSB, etc., may also be called reference signals.

[0194] Furthermore, in the wireless communication system 1, the Uplink Reference Signal (UL-RS) may transmit the Sounding Reference Signal (SRS), Demodulation Reference Signal (DMRS), etc. The DMRS may also be called the User-Specific Reference Signal (UE-specific Reference Signal).

[0195] (base station) Figure 18 shows an example of the configuration of a base station according to one embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of the control unit 110, transceiver unit 120, transceiver antenna 130, and transmission line interface 140 may be provided.

[0196] In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.

[0197] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, control circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0198] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc., using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140. The control unit 110 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transceiver unit 120. The control unit 110 may also perform call processing of communication channels (setting, releasing, etc.), status management of the base station 10, management of radio resources, etc.

[0199] The transmitting / receiving unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transmitting / receiving unit 120 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0200] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 1211 and an RF unit 122. The receiving unit may consist of a receiving processing unit 1212, an RF unit 122 and a measuring unit 123.

[0201] The transmitting and receiving antenna 130 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0202] The transmitting / receiving unit 120 may transmit the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 120 may also receive the uplink channel, uplink reference signal, etc.

[0203] The transmitting / receiving unit 120 may form at least one of the transmitting beam and the receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0204] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform processing on data and control information acquired from the control unit 110, for example, at the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer (e.g., RLC retransmission control), the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc., to generate a bit sequence to be transmitted.

[0205] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform transmission processing on the bit sequence to be transmitted, such as channel coding (which may include error correction coding), modulation, mapping, filtering, discrete Fourier transform (DFT) processing (if necessary), inverse fast Fourier transform (IFFT) processing, precoding, and digital-to-analog conversion, and output a baseband signal.

[0206] The transmitting / receiving unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 130.

[0207] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc., on the radio frequency band signal received by the transmitting / receiving antenna 130.

[0208] The transmitting / receiving unit 120 (receiving processing unit 1212) may apply reception processing to the acquired baseband signal, such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, to acquire user data, etc.

[0209] The transmitting / receiving unit 120 (measurement unit 123) may perform measurements related to the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc., based on the received signal. The measurement unit 123 may also measure received power (e.g., Reference Signal Received Power (RSRP)), reception quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0210] The transmission path interface 140 may send and receive signals (backhaul signaling) with devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0211] In this disclosure, the transmitting and receiving units of the base station 10 may consist of at least one of a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface 140.

[0212] The transmitting / receiving unit 120 may transmit multiple reference signals using different resources. The control unit 110 may control the association between one of the multiple reference signals and two or more of the multiple reference signals. The number of the multiple reference signals may be greater than 64.

[0213] The control unit 110 may determine one operation from a plurality of operations, which include a first operation in which the user terminal 20 receives a plurality of first reference signals from a plurality of reference signals, and a second operation in which the user terminal 20 receives a plurality of second reference signals from the plurality of reference signals. The transmitting / receiving unit 120 may transmit information indicating the one operation. The number of the plurality of second reference signals may be less than the number of the plurality of first reference signals.

[0214] The control unit 110 may determine one operation from a plurality of operations, including a first operation in which the user terminal 20 receives a plurality of first reference signals in the cell, and a second operation in which the user terminal 20 receives a plurality of second reference signals in the cell. The transmitting / receiving unit 120 may transmit information indicating the one operation. The number of plurality of second reference signals may be greater than the number of plurality of first reference signals.

[0215] (User terminal) Figure 19 shows an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Note that one or more of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided.

[0216] In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.

[0217] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, control circuit, etc., as described based on common understanding in the technical field related to this disclosure.

[0218] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc., using the transmitting / receiving unit 220 and the transmitting / receiving antenna 230. The control unit 210 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transmitting / receiving unit 220.

[0219] The transmitting / receiving unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitting / receiving unit 220 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0220] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 2211 and an RF unit 222. The receiving unit may consist of a receiving processing unit 2212, an RF unit 222 and a measuring unit 223.

[0221] The transmitting and receiving antenna 230 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0222] The transmitting / receiving unit 220 may receive the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 220 may also transmit the uplink channel, uplink reference signal, etc.

[0223] The transmitting / receiving unit 220 may form at least one of the transmitting beam and the receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0224] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc., on data and control information acquired from the control unit 210, etc., to generate a bit sequence to be transmitted.

[0225] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform transmission processing on the bit sequence to be transmitted, such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion, and output a baseband signal.

[0226] Whether or not to apply DFT processing may be based on the transform precoding settings. The transmitting / receiving unit 220 (transmission processing unit 2211) may perform DFT processing as part of the transmission process to transmit a channel (for example, PUSCH) using a DFT-s-OFDM waveform if transform precoding is enabled for that channel, or it may not perform DFT processing as part of the transmission process if transform precoding is not enabled for that channel.

[0227] The transmitting / receiving unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 230.

[0228] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc., on the radio frequency band signal received by the transmitting / receiving antenna 230.

[0229] The transmitting / receiving unit 220 (receiving processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.

[0230] The transmitting / receiving unit 220 (measuring unit 223) may perform measurements related to the received signal. For example, the measuring unit 223 may perform RRM measurement, CSI measurement, etc., based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0231] In this disclosure, the transmitting and receiving units of the user terminal 20 may consist of at least one of a transmitting / receiving unit 220 and a transmitting / receiving antenna 230.

[0232] The transmitting / receiving unit 220 may receive one of a plurality of reference signals (e.g., SSB / CSI-RS) that are transmitted (e.g., TDM / FDM / CDM / SDM) using different resources (e.g., time resources / frequency resources / code resources / spatial resources), respectively. The control unit 210 may control the reception of two or more of the plurality of reference signals (e.g., the SSB / CSI-RS under measurement, a specific SSB / CSI-RS) based on the result of receiving the one reference signal. The number of the plurality of reference signals may be greater than 64.

[0233] The aforementioned multiple reference signals may be divided into multiple groups. All reference signals within the aforementioned multiple groups may be time-division multiplexed.

[0234] The aforementioned multiple groups may correspond to multiple time periods. The transmitting / receiving unit 220 may receive each of the aforementioned multiple groups during the aforementioned multiple time periods.

[0235] The transmitting / receiving unit 220 may receive the multiple groups in the same symbol.

[0236] The control unit 210 may determine one operation from a plurality of operations, including a first operation (e.g., operation A) which receives a plurality of first reference signals from a plurality of reference signals (e.g., SSB / CSI-RS in a cell), and a second operation (e.g., operation B) which receives a plurality of second reference signals from the plurality of reference signals. The transmitting / receiving unit 220 may receive at least one of the plurality of first reference signals and the plurality of second reference signals according to the one operation. The number of the plurality of second reference signals may be less than the number of the plurality of first reference signals.

[0237] The aforementioned multiple reference signals may be divided into multiple groups. The aforementioned multiple second reference signals may be one of the aforementioned multiple groups.

[0238] The control unit 210 may determine the operation based on the received information.

[0239] The control unit 210 may determine the operation described above depending on whether the condition is met or not.

[0240] The control unit 210 may determine one operation from a plurality of operations, including a first operation of receiving a plurality of first reference signals in the cell (e.g., group A, SSB / CSI-RS using a wide beam) and a second operation of receiving a plurality of second reference signals in the cell (e.g., group B, SSB / CSI-RS using a narrow beam). The transmitting / receiving unit 220 may receive at least one of the plurality of first reference signals and the plurality of second reference signals according to the one operation. The number of the plurality of second reference signals may be greater than the number of the plurality of first reference signals.

[0241] The plurality of first reference signals may be a plurality of synchronization signal blocks within the cell.

[0242] The control unit 210 may determine the operation based on the received information.

[0243] The control unit 210 may determine the operation described above depending on whether the condition is met or not.

[0244] (Hardware configuration) The block diagrams used in the description of the above embodiments show functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may also be realized by combining the above one device or the above multiple devices with software.

[0245] Here, functions include, but are not limited to, judgment, decision, determination, calculation, calculation, 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 assigning. For example, a functional block (configuration part) that enables transmission may be called a transmitting unit or transmitter. In all cases, as mentioned above, the method of implementation is not particularly limited.

[0246] For example, a base station, user terminal, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. Figure 20 is a diagram showing an example of the hardware configuration of a base station and user terminal according to one embodiment. The base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0247] In this disclosure, terms such as apparatus, circuit, device, section, and unit are interchangeable. The hardware configuration of the base station 10 and the user terminal 20 may include one or more of the devices shown in the figure, or it may be configured to omit some of the devices.

[0248] For example, although only one processor 1001 is shown in the diagram, there may be multiple processors. Furthermore, processing may be performed by one processor, or by two or more processors simultaneously, sequentially, or by other means. Note that processor 1001 may be implemented using one or more chips.

[0249] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined software (programs) onto hardware such as the processor 1001 and memory 1002, which allows the processor 1001 to perform calculations and control communication via the communication device 1004, or to control at least one of the reading and writing of data in the memory 1002 and storage 1003.

[0250] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may be composed of a central processing unit (CPU) that includes interfaces with peripheral devices, control units, arithmetic units, registers, etc. For example, at least a part of the control unit 110 (210) and the transmitting / receiving unit 120 (220) described above may be implemented by the processor 1001.

[0251] Furthermore, the processor 1001 reads programs (program code), 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 accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be implemented similarly.

[0252] Memory 1002 is a computer-readable recording medium and may consist of at least one of the following: Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. Memory 1002 may also be called a register, cache, or main memory. Memory 1002 can store executable programs (program code), software modules, etc., for carrying out a wireless communication method according to one embodiment of this disclosure.

[0253] Storage 1003 is a computer-readable recording medium, and may be constituted by, for example, at least one of a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (e.g., a compact disk such as a Compact Disc ROM (CD-ROM), a digital versatile disk, a Blu-ray (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, and other suitable storage media. Storage 1003 may be referred to as an auxiliary storage device.

[0254] Communication device 1004 is hardware (a transmission / reception device) for performing communication 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. Communication device 1004 may be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-described transmission / reception unit **120(220)**, transmission / reception antenna **130(230)**, etc. may be implemented by communication device 1004. The transmission / reception unit **120(220)** may be physically or logically separated and implemented as a transmission unit **120a(220a)** and a reception unit **120b(220b)**.

[0255] Input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an external input. Output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs an output to the outside. Note that input device 1005 and output device 1006 may have an integrated configuration (e.g., a touch panel).

[0256] **Note**: The bolded numbers in the translation of item **ID=4** are the original numbers in the Japanese text and are likely placeholders for some specific references within the overall technical context. Since they are not clearly defined for translation purposes other than preservation, they are left as they are. Also, 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 for each device.

[0257] Also, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these hardware.

[0258] (Modified Example) In addition, terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be read interchangeably with each other. Also, the signal may be a message. The reference signal may also be abbreviated as RS and may be called a pilot, a pilot signal, etc. depending on the applied standard. Also, the component carrier (CC) may be called a cell, a frequency carrier, a carrier frequency, etc.

[0259] A wireless frame may consist of one or more periods (frames) in the time domain. Each of these periods (frames) constituting a wireless frame may be called a subframe. Furthermore, a subframe may consist 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.

[0260] Here, the neuralelogy may be communication parameters applied to at least one of the transmission and reception of a signal or channel. The neuralelogy may be, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, or specific windowing processes performed by the transceiver in the time domain.

[0261] A slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols or Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols). Alternatively, a slot may be a time unit based on neurology.

[0262] A slot may include multiple mini-slots. Each mini-slot may consist of one or more symbols in the time domain. Mini-slots may also be called sub-slots. Mini-slots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called a PDSCH (PUSCH) mapping type B.

[0263] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Wireless frames, subframes, slots, minislots, and symbols may each be referred to by different names. Furthermore, the units of time such as frames, subframes, slots, minislots, and symbols in this disclosure may be interpreted as interchangeable.

[0264] For example, one subframe may be called TTI, multiple consecutive subframes may be called TTI, or one slot or one mini-slot may be called TTI. In other words, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. Note that the unit representing TTI may be called a slot, mini-slot, etc., instead of a subframe.

[0265] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, the base station schedules each user terminal to allocate wireless resources (such as the frequency bandwidth and transmission power available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0266] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Given a TTI, the actual time interval (e.g., number of symbols) to which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0267] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0268] A TTI with a time length of 1 ms may also be called a normal TTI (TTI in 3GPP Rel.8-12), a long TTI, a normal subframe, a long subframe, or a slot. A TTI shorter than a normal TTI may also be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini slot, a sub slot, or a slot.

[0269] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0270] A Resource Block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0271] Furthermore, an RB may contain one or more symbols in the time domain and may have the length of one slot, one minislot, one subframe, or one TTI. Each TTI, subframe, etc., may consist of one or more resource blocks.

[0272] One or more RBs may also be called Physical RBs (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0273] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0274] A Bandwidth Part (BWP) (also called a partial bandwidth) may represent a subset of consecutive common resource blocks (RBs) for a given neurology in a given carrier. Here, the common RBs may be identified by an index of the RBs relative to the carrier's common reference point. PRBs may be defined and numbered within a BWP.

[0275] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured within one carrier.

[0276] At least one of the configured BWPs may be active, and the UE may not be assumed to transmit and receive a predetermined signal / channel outside the active BWP. Note that "cell", "carrier", etc. in this disclosure may be read as "BWP".

[0277] Note that the structures such as the above-described radio frames, subframes, slots, minislots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, and the number of symbols within a TTI, symbol length, Cyclic Prefix (CP) length, etc. can be changed variously.

[0278] Also, the information, parameters, etc. described in this disclosure may be represented using absolute values, relative values from a predetermined value, or corresponding other information. For example, a radio resource may be indicated by a predetermined index.

[0279] The names used for parameters, etc. in this disclosure are not limiting names in any respect. Furthermore, mathematical formulas using these parameters, etc. may be different from those explicitly disclosed in this disclosure. Since various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, the various names assigned to these various channels and information elements are not limiting names in any respect.

[0280] The information, signals, etc. described in this disclosure may be represented using any of the various different techniques. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0281] Furthermore, information, signals, etc., can be output from upper layers to lower layers and from lower layers to upper layers, or to at least one of the two. Information, signals, etc., may also be input and output via multiple network nodes.

[0282] Input and output information and signals may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information and signals may be overwritten, updated, or appended to. Output information and signals may be deleted. Input information and signals may be transmitted to other devices.

[0283] Information notification is not limited to the embodiments described herein and may be carried out by other means. For example, information notification in this disclosure may be carried out by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof).

[0284] Physical layer signaling may also be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signals), L1 control information (L1 control signals), etc. RRC signaling may also be called RRC messages, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc. MAC signaling may also be communicated using, for example, MAC Control Element (CE).

[0285] Furthermore, notification of the specified information (for example, notification that "X is the case") is not limited to explicit notification, but may also be made implicitly (for example, by not providing notification of the specified information or by providing notification of other information).

[0286] The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value represented as true or false, or by a numerical comparison (for example, a comparison with a predetermined value).

[0287] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0288] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or Digital Subscriber Line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0289] The terms “system” and “network” as used in this disclosure may be used interchangeably. “Network” may also mean the equipment included in the network (e.g., base stations).

[0290] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "quasi-co-location (QCL)," "transmission configuration indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," and "panel" may be used interchangeably.

[0291] In this disclosure, terms such as "Base Station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0292] A base station can house one or more (e.g., three) cells. If a base station houses multiple cells, the entire coverage area of ​​the base station can be divided into several smaller areas, each of which may also be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms “cell” or “sector” refer to part or all of the coverage area of ​​at least one of the base station and / or base station subsystems that provide communication services in that coverage.

[0293] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0294] A mobile station may also be called 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 appropriate term.

[0295] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may also be a device mounted on a moving object, the moving object itself, etc.

[0296] The term "mobile object" refers to any movable object, regardless of its speed, and naturally includes cases where the mobile object is stationary. Examples of such mobile objects include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcarts, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and items carried on them. Furthermore, such mobile objects may be autonomously driven objects operating based on operational commands.

[0297] The mobile entity may be a vehicle (e.g., a car, an airplane), an unmanned mobile entity (e.g., a drone, an autonomous vehicle), 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 Internet of Things (IoT) device such as a sensor.

[0298] Figure 21 shows an example of a vehicle according to one embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotation speed sensor 51, a pneumatic pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0299] The drive unit 41 consists of, for example, at least one of an engine, a motor, or an engine-motor hybrid. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by the user.

[0300] The electronic control unit 49 consists of a microprocessor 61, memory (ROM, RAM) 62, and communication ports (e.g., input / output (IO) ports) 63. Signals from various sensors 50-58 installed in the vehicle are input to the electronic control unit 49. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0301] Signals from various sensors 50-58 include current signals from current sensor 50 for sensing motor current, rotational speed signals of front wheels 46 / rear wheels 47 acquired by rotational speed sensor 51, air pressure signals of front wheels 46 / rear wheels 47 acquired by air pressure sensor 52, vehicle speed signals acquired by vehicle speed sensor 53, acceleration signals acquired by acceleration sensor 54, accelerator pedal depression signal of accelerator pedal 43 acquired by accelerator pedal sensor 55, brake pedal depression signal of brake pedal 44 acquired by brake pedal sensor 56, operation signals of shift lever 45 acquired by shift lever sensor 57, and detection signals for detecting obstacles, vehicles, pedestrians, etc., acquired by object detection sensor 58.

[0302] The information service unit 59 consists of various devices for providing (outputting) various types of information such as driving information, traffic information, and entertainment information, including a car navigation system, audio system, speakers, displays, television, and radio, and one or more ECUs that control these devices. The information service unit 59 uses information acquired from external devices via a communication module 60 or the like to provide various types of information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0303] The information service unit 59 may include input devices that accept input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.) and output devices that perform output to the outside (e.g., display, speaker, LED lamp, touch panel, etc.).

[0304] The driver assistance system unit 64 consists of various devices that provide functions to prevent accidents or reduce the driver's workload, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Unit (IMU), Inertial Navigation System (INS)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driver assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driver assistance functions or autonomous driving functions.

[0305] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 sends and receives data (information) via the communication port 63 to the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axle 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and various sensors 50-58 provided in the vehicle 40.

[0306] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with external devices. For example, it can send and receive various types of information to and from external devices via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the base station 10 or the user terminal 20 described above. Alternatively, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 (it may function as at least one of the base station 10 and the user terminal 20).

[0307] The communication module 60 may transmit at least one of the following to an external device via wireless communication: signals from the various sensors 50-58 input to the electronic control unit 49, information obtained based on said signals, and information based on input from an external source (user) obtained via the information service unit 59. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc., may also be called input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above input.

[0308] The communication module 60 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from an external device and displays it on the information service unit 59 installed in the vehicle. The information service unit 59 may also be called an output unit, which outputs information (for example, it outputs information to devices such as displays and speakers based on the PDSCH (or data / information decoded from the PDSCH) received by the communication module 60).

[0309] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axle 48, various sensors 50-58, etc., which are provided in the vehicle 40.

[0310] Furthermore, the term "base station" in this disclosure may be interpreted as "user terminal." For example, the various aspects / embodiments of this disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may have the functions that the base station 10 has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, uplink channel and downlink channel may be interpreted as sidelink channel.

[0311] Similarly, the term "user terminal" in this disclosure may be replaced with "base station." In this case, the base station 10 may be configured to have the same functions as the user terminal 20 described above.

[0312] In this disclosure, operations performed by a base station may, in some cases, be performed by its upper node. In a network including one or more network nodes with base stations, it is clear that various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (for example, a Mobility Management Entity (MME), a Serving Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0313] Each aspect / embodiment described in this disclosure may be used individually, in combination, or switched between during execution. Furthermore, the processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described in this disclosure may be rearranged in order, provided they are consistent. For example, the methods described in this disclosure present various step elements in an exemplary order and are not limited to that specific order.

[0314] Each aspect / embodiment described in this disclosure includes Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (where x is, for example, an integer or decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM®), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), and IEEE This may apply to systems utilizing 802.20, Ultra-WideBand (UWB), Bluetooth®, or other appropriate wireless communication methods, as well as next-generation systems that are extended, modified, created, or defined based on these. It may also apply to combinations of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0315] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0316] Any reference to elements using the designations “first,” “second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Accordingly, the references to the first and second elements do not imply that only two elements may be employed or that the first element must precede the second element in any way.

[0317] The term “determining” as used in this disclosure may encompass a wide variety of actions. For example, “determining” may be considered to include judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (e.g., searching in tables, databases, or other data structures), ascertaining, etc.

[0318] Furthermore, "judgment (decision)" may be considered as "judging (deciding)" things like receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory).

[0319] Furthermore, "judgment (decision)" can be considered as "judging (deciding)" something like resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment (decision)" can be considered as "judging (deciding)" something about an action.

[0320] Furthermore, "judgment (decision)" can be replaced with "assuming," "expecting," or "considering."

[0321] The term "maximum transmit power" as used in this disclosure may mean the maximum transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0322] As used in this disclosure, the terms “connected,” “coupled,” and any variations thereof mean any direct or indirect connection or coupling between two or more elements, and may include one or more intermediate elements between two elements that are “connected” or “coupled” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be replaced with “access.”

[0323] In this disclosure, when two elements are connected, they can be considered to be “connected” or “coupled” to each other using one or more wires, cables, printed electrical connections, etc., and, in some non-exclusive and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, or optical domain (both visible and invisible).

[0324] In this disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "combine" may be interpreted similarly to "different."

[0325] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0326] In this disclosure, if articles are added by translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0327] Although the invention described herein has been explained in detail above, it will be clear to those skilled in the art that the invention described herein is not limited to the embodiments described herein. The invention described herein can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined in the claims. Therefore, the descriptions herein are for illustrative purposes only and do not imply any limitation on the invention described herein.

Claims

1. A receiving unit that receives one reference signal within the first group from among multiple reference signals that are transmitted using different resources, time-division multiplexed, and divided into multiple groups including the first group, second group, and third group, The system includes a control unit that controls the reception of one or more reference signals in the second group and one or more reference signals in the third group based on the reception of one of the reference signals in the first group, The terminal has more than 64 reference signals.

2. The terminal according to claim 1, wherein all reference signals within the plurality of groups are time-division multiplexed.

3. The aforementioned groups correspond to multiple time periods, The receiving unit receives the plurality of groups during the plurality of periods, as described in claim 2.

4. The terminal according to claim 2, wherein the receiving unit receives the plurality of groups in the same symbol.

5. The process involves receiving one reference signal from the first group among a plurality of reference signals that are transmitted using different resources, time-division multiplexed, and divided into multiple groups including the first group, the second group, and the third group. The process includes the step of controlling the reception of one or more reference signals in the second group and one or more reference signals in the third group based on the reception of one of the reference signals in the first group, A wireless communication method for a terminal, wherein the number of the aforementioned multiple reference signals is greater than 64.

6. A transmitting unit that transmits one of several reference signals within the first group, which are transmitted using different resources, time-division multiplexed, and divided into multiple groups including a first group, a second group, and a third group, The device includes a control unit that controls the terminal to transmit one or more reference signals from a second group and one or more reference signals from a third group, based on the reception of one of the reference signals from the first group, The base station has more than 64 reference signals.

7. A system having a terminal and a base station, The aforementioned terminal is A receiving unit that receives one reference signal within the first group from among multiple reference signals that are transmitted using different resources, time-division multiplexed, and divided into multiple groups including the first group, second group, and third group, The system includes a control unit that controls the reception of one or more reference signals in the second group and one or more reference signals in the third group based on the reception of one of the reference signals in the first group, The aforementioned base station is The system includes a transmitting unit that transmits one of the reference signals within the first group, The number of the aforementioned reference signals is greater than 64 in the system.

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