Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure is provided with: a control unit that determines either an operation for searching for SSBs of all SSB indices in a plurality of synchronization signal block (SSB) groups, which are frequency-division multiplexed, and an operation for searching for SSBs of a specific SSB index in the plurality of SSB groups, one SSB group including a plurality of time-division multiplexed SSBs; and a receiving unit that detects one SSB in the plurality of SSB groups. According to one embodiment of the present disclosure, it is possible to improve coverage in consideration of overhead.

Description

Technical Field

[0001] The present disclosure relates to a terminal, a wireless communication method, and a base station in a next-generation mobile communication system. Background Art

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) is standardized for the purpose of further high-speed data rate, low latency, etc. (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) is standardized for the purpose of further increasing capacity and sophistication of LTE (Third Generation Partnership Project (3GPP (registered trademark)) version (Release (Rel.)) 8, 9).

[0003] Successor systems of LTE (also known as, 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 studied.

[0004] Prior art literature

[0005] Non-patent literature

[0006] Non-patent document 1: 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In future wireless communication systems (eg, NR), improvement of coverage is being studied.

[0009] However, if the beams are narrowed or increased in number in order to improve coverage, there is a concern that overhead will increase and communication throughput will decrease.

[0010] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can improve coverage in consideration of overhead.

[0011] Means for solving problems

[0012] A terminal involved in one method of the present disclosure includes: a control unit, which determines either an operation of searching for SSBs of all SSB indexes within a plurality of synchronization signal blocks (SSB) groups or an operation of searching for SSBs of specific SSB indexes within the plurality of SSB groups, wherein the plurality of SSB groups are frequency-division multiplexed, and one SSB group includes a plurality of SSBs that are time-division multiplexed; and a receiving unit, which detects one SSB within the plurality of SSB groups.

[0013] Effects of the Invention

[0014] According to one aspect of the present disclosure, it is possible to improve coverage while taking overhead into consideration. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1A as well as Figure 1B This is a diagram showing an example of beams and coverage.

[0016] Figure 2 This is a diagram showing an example of SSB involved in Option 1.

[0017] Figure 3A as well as Figure 3B This is a diagram showing an example of SSB involved in Option 2.

[0018] Figure 4A as well as Figure 4B FIG. 1 is a diagram showing an example of a measurement target based on operations B and A. FIG.

[0019] Figure 5A as well as Figure 5B This is a diagram showing an example of reception based on operations B and A.

[0020] Fig. 6A as well as Figure 6B This is a diagram showing an example of set SSB reception.

[0021] Fig. 7A as well as Figure 7B This is a diagram showing an example of scheduling restrictions on other DL signals in the case of receiving all / part of the configured SSB.

[0022] Fig. 8A as well as Figure 8BThis is a diagram showing another example of set SSB reception.

[0023] Fig. 9 This is a diagram showing an example of beams within a cell.

[0024] Fig.10 This is a diagram showing an example of selection method 1.

[0025] Fig.11A as well as Fig. 11B This is a diagram showing an example of selection method 2.

[0026] Fig. 12A as well as Fig. 12B This is a diagram showing another example of selection method 2.

[0027] Fig.13 This is a diagram showing an example of a method for detecting SSB according to embodiment 1-1.

[0028] Fig.14 This is a diagram showing an example of a method for detecting SSB according to option 1-1-2.

[0029] Fig.15 This is a diagram showing an example of a method for detecting SSB according to Embodiment 1-2.

[0030] Fig.16 This is a diagram showing another example of the SSB detection method involved in embodiment 1-2.

[0031] Fig.17A as well as Fig. 17B This is a diagram showing an example of a method for detecting SSB according to embodiment 1-2-1.

[0032] Fig.18A as well as Fig.18B The diagrams show an example of time / frequency mapping of SSB according to Implementation 1-3-1 and Implementation 1-3-2, respectively.

[0033] Fig.19A as well as Fig.19B This is a diagram showing an example of mapping of SSB involved in implementation modes 1-4.

[0034] Fig. 20 It is a diagram showing an example of PRACH resources / preamble codes involved in the second embodiment.

[0035] Fig.21 It is a diagram showing an example of RAR according to the third embodiment.

[0036] Fig. 22 It is a diagram showing another example of the RAR according to the third embodiment.

[0037] Fig.23 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0038] Fig.24 This is a diagram showing an example of the configuration of a base station according to an embodiment.

[0039] Fig.25 This is a diagram showing an example of a configuration of a user terminal according to an embodiment.

[0040] Fig.26 This is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment.

[0041] Fig. 27 This is a diagram showing an example of a vehicle according to an embodiment. DETAILED DESCRIPTION

[0042] (TCI, spatial relationship, QCL)

[0043] In NR, research is being conducted to control the reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, and coding) of at least one of a signal and a channel (expressed as signal / channel) in the UE based on the transmission configuration indication state (Transmission Configuration Indication state (TCI state)).

[0044] The TCI state may also represent the state of a signal / channel applied to a downlink. A state equivalent to the TCI state applied to a signal / channel applied to an uplink may also be expressed as a spatial relation.

[0045] The so-called TCI state is information related to Quasi-Co-Location (QCL) of signals / channels, and may also be called spatial reception parameters, spatial relationship information, etc. The TCI state may also be set for each channel or each signal to the UE.

[0046] The so-called QCL is an index (indicator) indicating the statistical properties of a signal / channel. For example, it can also mean that when a certain signal / channel is in a QCL relationship with other signals / channels, it can be assumed that at least one of the Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (for example, spatial Rx parameter) is the same among these different multiple signals / channels (at least one of them is QCL).

[0047] In addition, the spatial reception parameter may also correspond to a reception beam of the UE (eg, a reception analog beam), and the beam may also be determined based on the spatial QCL. The QCL (or at least one element of the QCL) in the present disclosure may also be rewritten as sQCL (spatial QCL).

[0048] Regarding QCL, multiple types (QCL types) may also be specified. For example, four QCL types AD may be set, and the parameters (or parameter sets) that can be assumed to be the same in the four QCL types AD are different. The parameters (also referred to as QCL parameters) are expressed as follows:

[0049] QCL Type A (QCL-A): Doppler shift, Doppler spread, average delay, and delay spread,

[0050] QCL type B (QCL-B): Doppler shift and Doppler spread,

[0051] QCL Type C (QCL-C): Doppler shift and average delay,

[0052] QCL type D (QCL-D): spatial reception parameters.

[0053] The situation where the UE assumes that a certain control resource set (CORESET), channel or reference signal is in a specific QCL (for example, QCL type D) relationship with other CORESETs, channels or reference signals can also be called QCL assumption.

[0054] The UE may also determine at least one of the transmit beam (Tx beam) and receive beam (Rx beam) of the signal / channel based on the TCI status or QCL assumption of the signal / channel.

[0055] The TCI state may be, for example, information related to the QCL between the channel being the object (in other words, the reference signal (RS) used for the channel) and other signals (for example, other RS). The TCI state may also be set (indicated) by high-layer signaling, physical layer signaling, or a combination thereof.

[0056] The physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI))).

[0057] The channel for which the TCI state or spatial relationship is set (specified) may be, for example, at least one of a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0058] In addition, the RS that is in a QCL relationship with the channel may be, for example, at least one of a synchronization signal block (SynchronizationSignal Block (SSB)), a channel state information reference signal (CSI-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a tracking CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called QRS).

[0059] The SSB is a signal block including at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)), a secondary synchronization signal (Secondary Synchronization Signal (SSS)), and a broadcast channel (Physical Broadcast Channel (PBCH)). The SSB may also be referred to as an SS / PBCH block.

[0060] The RS of QCL type X in the TCI state may also mean an RS that is in a QCL type X relationship with a certain channel / signal (DMRS), and the RS may also be referred to as a QCL source of QCL type X in the TCI state.

[0061] (Initial access process)

[0062] During the initial access process, the UE (RRC_IDLE mode) performs: reception of SS / PBCH blocks (SSBs), transmission of Msg.1 (PRACH / random access preamble / preamble), reception of Msg.2 (PDCCH, PDSCH containing random access response (RAR)), transmission of Msg.3 (PUSCH scheduled by RAR UL grant), and reception of Msg.4 (PDCCH, PDSCH containing UE contention resolution identity). Afterwards, if an ACK for Msg.4 is sent from the UE via the base station (network), an RRC connection is established (RRC_CONNECTED mode).

[0063] SSB reception includes PSS detection, SSS detection, PBCH-DMRS detection, and PBCH reception. PSS detection detects part of the physical cell ID (PCI), detects (synchronizes) the OFDM symbol timing, and (roughly) synchronizes the frequency. SSS detection includes detection of the physical cell ID. PBCH-DMRS detection includes detection of (part of) the SSB index within a half radio frame (5ms). PBCH reception includes: detection of the system frame number (SFN) and radio frame timing (SSB index), reception of setting information for receiving the remaining minimum system information (RMSI, SIB1), and identification of whether the UE can reside in the cell (carrier).

[0064] SSB has a 20 RB band and a 4-symbol time. The transmission period of SSB can be set from {5, 10, 20, 40, 80, 160} ms. In a half frame, multiple symbol positions of SSB are specified based on the frequency range (FR1, FR2).

[0065] PBCH has a payload of 56 bits. N repetitions of PBCH are sent in a period of 80 ms. N depends on the SSB transmission period.

[0066] System information consists of MIB, RMSI (SIB1), and other system information (OSI) transmitted through PBCH. SIB1 includes RACH configuration and information for performing RACH procedures. The relationship between the time / frequency resources of SSB and SIB1 PDCCH monitoring resources is set through PBCH.

[0067] The base station using beam correspondence uses multiple beams to transmit multiple SSBs in each SSB transmission period. The multiple SSBs each have multiple SSB indexes. A UE that detects one SSB transmits a PRACH in a RACH timing associated with the SSB index and receives a RAR in a RAR window.

[0068] The UE receives the SSB (PSS / SSS included therein) during initial access. The frequency at which the UE searches for the PSS / SSS may also be referred to as a synchronization raster.

[0069] The synchronization grid is defined for each frequency range (FR1 / FR2).

[0070] The wider the frequency interval of the synchronization grid (the fewer the number of synchronization grids), the shorter the time taken for the search in the initial access, and the less load.

[0071] Candidates for frequency positions where component carriers (CCs) are configured are called a channel grid.

[0072] The interval of the synchronization grid is determined to satisfy specific conditions. Specifically, the interval of the synchronization grid is determined so that no matter in which channel grid CC is configured with the minimum channel bandwidth (CBW), at least one synchronization grid exists in which the SSB band in the synchronization grid is included in the CBW.

[0073] At the time of initial access, the order in which the UE searches for the synchronization grid depends on the UE implementation. For efficient search, the Global Synchronization Channel Number (GSCN) is specified, and the GSCN offset / GSCN range is notified to the UE.

[0074] The search target frequencies of PSS / SSS other than those at the time of initial access are indicated to the UE from the network (NW, for example, a base station).

[0075] For example, in case of being instructed to perform RSRP / RSRQ / SINR measurements on neighboring cells, the UE is instructed the SSB frequency using the higher layer parameter "MeasObjectNR".

[0076] For example, when the UE is instructed to add a serving cell, the UE is instructed with the SSB frequency using the higher layer parameter "FrequencyInfoDL".

[0077] For example, in the idle mode, the UE is instructed about the SSB frequency using SIB4 (InterFreqCarrierFreqInfo).

[0078] (Beam and Coverage)

[0079] In high frequency bands, if beamforming is not applied to synchronization signals / reference signals, the coverage becomes narrower and it is difficult for UE to find base stations. On the other hand, if beamforming is applied to synchronization signals / reference signals to ensure coverage, strong signals are transmitted in a specific direction, but it becomes more difficult to transmit signals in other directions ( Figure 1A ). In the base station before the UE is connected, if the direction of the UE is unknown, it is impossible to send the synchronization signal / reference signal using a beam that is only facing the appropriate direction. Consider the following method: the base station sends multiple synchronization signals / reference signals with beams in different directions, and the UE identifies which beam is found. If a thin (narrow) beam is used for coverage, a large number of synchronization signals / reference signals need to be sent, so there is a concern that overhead will increase and frequency utilization efficiency will decrease.

[0080] In order to reduce the number of beams (synchronization signals / reference signals) and suppress overhead, if a coarse (wide) beam is used, the coverage becomes narrower ( Figure 1B ).

[0081] In future wireless communication systems (for example, 6G), further development of the use of frequency bands such as millimeter waves and terahertz waves is considered. It is considered to provide communication services by constructing the area / coverage of a cell using a large number of fine beams.

[0082] Considering the expansion of the area using the existing FR2 and the use of a frequency band higher than the existing FR2, in order to achieve these, in addition to multi-TRP, reconfigurable intelligent surface (RIS), etc., it is also preferred to improve beam management.

[0083] In the current 5G NR, the maximum number of synchronization signal blocks (SSBs) is 64. A maximum of 64 beams are required to cover the area (surface) of the cell, so it is difficult to use thin beams. In order to use a large number of thin beams, the following beam management methods 1 and 2 are considered.

[0084] [Beam management method 1]

[0085] Use more than 64 SSBs (the maximum number of SSBs exceeds 64). If the number of SSBs is simply increased, there is a concern that the SSB overhead / initial access delay will increase.

[0086] [Beam management method 2]

[0087] Use 64 or fewer SSBs (the maximum number of SSBs is 64). Reduce the area (surface) covered by one cell / sector. There is concern that interference between cells / sectors and high-speed / frequent handovers between cells / sectors may become a problem.

[0088] In beam management method 1, the following options 1 and 2 are being studied for the use of SSB.

[0089] [Option 1]

[0090] Use time division multiplexing (TDM) to send more than 64 SSBs.

[0091] Figure 2 is a diagram showing an example of SSB involved in Option 1. Figure 2 In the example shown, more than 64 SSBs (SSB#0 to SSB#191) are transmitted by TDM.

[0092] like Figure 2 As shown, in Option 1, considering that an SSB period longer than 64 SSBs such as the existing specification is required, the delay in the initial access increases.

[0093] [Option 2]

[0094] Use time division multiplexing (TDM) and frequency division multiplexing (FDM) to send more than 64 SSBs.

[0095] Figure 3A as well as Figure 3B is a diagram showing an example of SSB involved in Option 2. Figure 3A as well as Figure 3B In the example shown, more than 64 SSBs (SSB#0 to SSB#191) are transmitted by TDM and FDM.

[0096] exist Figure 3A as well as Figure 3B In the example shown, 64 SSBs (SSB#0 to SSB#63, SSB#64 to SSB#127, SSB#128 to SSB#191) form one set, and three sets are FDMed.

[0097] In option 2, the SSB period for the UE is different depending on whether the UE has multiple receiving panels.

[0098] [Option 2-1]

[0099] For example, a UE with one receiving panel can receive one SSB in the same time resource. Thus, 64 SSBs (maximum) are received in each set of FDM, so a longer SSB period is required than the SSB period of 64 SSBs in the existing specification, considering the increased delay in initial access (refer to Figure 3A ).

[0100] [Option 2-2]

[0101] In addition, for example, a UE with multiple receiving panels can receive multiple SSBs in the same time resource. Figure 3B Therefore, it is possible to receive the same period as the SSB period of 64 SSBs in the existing specification (reference Figure 3B ).

[0102] Thus, in future wireless communication systems, the use of a larger number of SSBs than those specified in existing specifications is being studied. However, in this case, research on the reception / exploration (search) method of SSBs, the implementation of UEs, the method of random access procedures, etc. is not yet sufficient. If these studies are not sufficient, there is a concern that overhead will increase and communication throughput will decrease.

[0103] Therefore, the inventors of the present invention have conceived a method for suppressing the overhead / initial access delay.

[0104] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods according to the embodiments may be applied individually or in combination.

[0105] In the present disclosure, "A / B" and "at least one of A and B" may be replaced with each other. In addition, in the present disclosure, "A / B / C" may also mean "at least one of A, B, and C".

[0106] In the present disclosure, activate, deactivate, indicate (or specify), select, configure, update, determine, etc. may also be rewritten mutually. In the present disclosure, support, control, controllable, operate, and operate may also be rewritten mutually.

[0107] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, high-layer parameters, information elements (IE), settings, etc. can also be overwritten with each other. In the present disclosure, Medium Access Control (MAC Control Element (CE)), update commands, activation / deactivation commands, etc. can also be overwritten with each other.

[0108] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0109] In the present disclosure, MAC signaling may also use, for example, MAC Control Element (MACCE), MAC Protocol Data Unit (MAC Protocol Data Unit (PDU)), etc. Broadcast information may also be, for example, Master Information Block (MIB), System Information Block (SIB), minimum system information (Remaining Minimum System Information (RMSI)), Other System Information (Other System Information (OSI)), etc.

[0110] In the present disclosure, the physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI)), etc.

[0111] In the present disclosure, index, identifier (ID), indicator, resource ID, etc. can also be rewritten to each other. In the present disclosure, sequence, list, set, group, group, cluster, subset, etc. can also be rewritten to each other.

[0112] In the present disclosure, panel, receiving panel, receiving chain, UE panel, panel group, antenna group, UE capability value (UECapability value), UE capability value set (UECapability value set), beam, beam group, precoder, uplink (Uplink (UL)) transmission entity, transmission / reception point (Transmission / Reception Point (TRP)), base station, spatial relationship information (Spatial Relation Information (SRI)), spatial relationship, SRS resource indicator (SRSResource Indicator (SRI)), control resource set (COntrol REsource SET (CORESET)), physical downlink shared channel (Physical Downlink Shared Channel (PDSCH)), codeword (Codeword (CW)), transport block (Transport Block (TB)), reference signal (Reference Signal (RS)), antenna port (e.g., demodulation reference signal (DeModulation Reference Signal (DMRS))) port), antenna port group (e.g., DMRS port group), group (e.g., spatial relationship group, code division multiplexing (Code Division Multiplexing (CDM)) group, reference signal group, CORESET group, Physical Uplink Control Channel (PUCCH) group, PUCCH resource group), resources (for example, reference signal resources, SRS resources), resource sets (for example, reference signal resource sets), CORESET pool, downlink transmission configuration indication state (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. can also be rewritten with each other.

[0113] In the present disclosure, the index / indicator and beam index of SSB / CSI-RS may also be overwritten with each other.

[0114] (Wireless Communication Method)

[0115] In each embodiment of the present disclosure, SSB may also mean an SSB set to be measured by a UE. For example, SSB may also be an SSB set for a specific purpose (e.g., at least one of beam management, radio link monitoring, radio resource management, and beam failure detection).

[0116] In each embodiment of the present disclosure, SSB is mainly used as an example for explanation, but the reference signal / synchronization signal is not limited to SSB. In each embodiment of the present disclosure, the reference signal, synchronization signal, SSB, CSI-RS, DL-RS, TRS, beam, and TCI state can also be rewritten with each other.

[0117] In each embodiment, a period, a time domain, a frame, a subframe, a time slot, a sub-time slot, and a codeword may be replaced with each other.

[0118] In each embodiment, a group, a set, an SSB of a measurement object, a specific SSB, and a specific reference signal (RS) may also be overwritten with each other.

[0119] In each embodiment, the number of SSBs may be different from the number of existing SSBs, may be greater than the number of existing SSBs, and may be greater than 64.

[0120] In the present disclosure, in addition to SSB being TDM, the case of FDM is mainly described. However, FDM is only an example, and SSB can also be space division multiplexing (SDM) / code division multiplexing (CDM). In other words, in the present disclosure, SSB can also be TDM / FDM / SDM / CDM. In the present disclosure, TDM, FDM, SDM, and CDM can also be rewritten to each other.

[0121] The various embodiments of the present disclosure may be applied to both a licensed band (licensed spectrum) and an unlicensed band (shared spectrum).

[0122] The various embodiments of the present disclosure may also be limited to the reception operation of the reference signal / synchronization signal other than the initial access. Other than the initial access refers to at least one of the following situations: for example, when RSRP / RSRQ / SINR measurement of neighboring cells is instructed, when the addition of a serving cell is instructed, during switching, and in idle mode.

[0123] In the present disclosure, the index / indicator of the SSB and the beam index may also be overwritten with each other.

[0124] In the present disclosure, receiving, measuring, detecting, exploring (searching), and monitoring can also be mutually replaced. In the present disclosure, receiving (or sending), performing receiving (or sending) operations, and controlling receiving (or sending) can also be mutually replaced.

[0125] <Zeroth Implementation Method>

[0126] This embodiment relates to the switching of measurement objects.

[0127] The UE may be configured with multiple beams (SSB reception). The UE may receive / measure / detect all of the configured multiple beams (SSB). In addition, the UE may receive / measure / detect a portion of the configured multiple beams (SSB).

[0128] Perform the reception / measurement / detection operation of all SSBs that are set (A) Figure 4B ), and operation B ( Figure 4A ) may also be switched. The UE may also determine either operation A or operation B. The base station may also instruct / set either operation A or operation B.

[0129] By switching from operation A to operation B, unnecessary SSB reception / measurement / detection can be avoided, and the time / delay required for SSB reception / measurement / detection can be reduced. By not receiving / measuring / detecting SSB during a part of the period, scheduling restrictions can be avoided and throughput can be increased.

[0130] exist Figure 5A as well as Figure 5B In the example, groups #0 to #2 are transmitted. Groups #0 to #2 each contain SSB #0 to SSB #63. Figure 5A An example of operation B is shown. The UE selects group #1 from the configured groups #0 to #2 as the measurement object, and by performing reception / measurement / detection of only group #1, it is possible to complete reception / measurement / detection of all SSBs #0 to #63 of the measurement object in only one of the periods #1 to #3, thereby suppressing measurement delay. Figure 5B An example of operation A is shown. By receiving / measuring / detecting all SSBs of the configured groups #0 to #2, the UE can complete receiving / measuring / detecting all SSBs in the periods #1 to #3.

[0131] In the above option 1, the UE may also receive / measure / detect / search all of the configured SSBs (refer to Fig. 6A ).

[0132] For example, the UE may be a UE having one receiving panel or a UE using one receiving panel.

[0133] exist Fig. 6A In the example shown, when the number of SSBs set for the UE is N×64, the period of the SSB is N times as large as that of the existing standards (up to Rel. 15 / 16 / 17).

[0134] In the above option 1, the UE may also receive / measure / detect / search a portion of the configured SSB (specific SSB) (refer to Figure 6B ).

[0135] For example, the UE may be a UE having one receiving panel or a UE using one receiving panel.

[0136] exist Figure 6B In the example shown, even when the number of SSBs configured for the UE is N×64, the period of the SSB can be equal to the existing standards (up to Rel. 15 / 16 / 17).

[0137] exist Figure 6B In the case shown, it is possible to set not to perform measurement other than the measurement target, thereby reducing power consumption.

[0138] The UE may also decide in Option 1 to either receive / measure / detect / search all of the configured SSBs (operation A) or receive / measure / detect / search only a portion of the configured SSBs (operation B). The UE may also switch in Option 1 between receive / measure / detect / search all of the configured SSBs (operation A) and receive / measure / detect / search only a portion of the configured SSBs (operation B).

[0139] In addition, in the existing specifications, in a specific frequency range (e.g., FR2), in the codeword of SSB, other DL signals of QCL type D different from SSB cannot be received (scheduling restriction is imposed on other DL signals). Figure 6B In the case shown, the codewords of SSB can be reduced, thereby increasing the reception opportunities of other DL signals of QCL type D different from SSB.

[0140] Fig. 7A This is a diagram showing an example of scheduling restrictions on other DL signals when all configured SSBs are received. Fig. 7A Corresponding to the above Fig. 6A .

[0141] exist Fig. 7AIn the example shown, for the UE, a DL signal (e.g., PDSCH) having a QCL type D relationship with SSB#65 can be scheduled in the same time domain as SSB#65. On the other hand, for the UE, a DL signal (e.g., PDSCH) having a QCL type D relationship with SSB#65 is not scheduled in a time domain different from SSB#65 (the same time domain as SSBs other than SSB#65).

[0142] Figure 7B This is a diagram showing an example of scheduling restrictions on other DL signals when receiving a part of the configured SSB. Figure 7B Corresponding to the above Figure 6B .

[0143] exist Figure 7B In the example shown, for the UE, a DL signal (e.g., PDSCH) having a QCL type D relationship with SSB#65 can be scheduled in the same time domain as SSB#65. On the other hand, for the UE, a DL signal (e.g., PDSCH) having a QCL type D relationship with SSB#65 is not scheduled in the same time domain as SSB#64 and SSB#66-#127 in a time domain different from SSB#65.

[0144] In addition, in the present disclosure, the number of DL signals of different QCL type D that can be received simultaneously is shown to be 1, but it is not limited to this number. The number may be greater than 2, may be pre-defined in the specification, may be a value reported through UE capability information, and may be set / notified to the UE through high-layer signaling.

[0145] In the above option 2, the UE may also receive / measure / detect / search all of the configured SSBs (refer to Fig. 8A ).

[0146] The UE may be, for example, a UE having one receiving panel, or a UE using one receiving panel ( Fig. 8A The UE may also be, for example, a UE having multiple receiving panels, or a UE using multiple receiving panels ( Fig. 8A UE#2 in the ).

[0147] exist Fig. 8A In the example shown, when the number of SSBs set for UE is N×64, the period of SSB for UE#1 is N times that of the existing specification (Rel.15 / 16 / 17). At this time, the period of SSB for UE#2 is the same as (equal to) the existing specification (Rel.15 / 16 / 17).

[0148] In option 2 above, the UE may also receive / measure / detect / search for a portion of the configured SSB (refer to Figure 8B ).

[0149] The UE may be, for example, a UE having one receiving panel, or a UE using one receiving panel ( Figure 8B The UE may also be, for example, a UE having multiple receiving panels, or a UE using multiple receiving panels ( Figure 8B UE#2 in the UE.

[0150] The UE may also receive / measure / detect / search for a portion of the configured SSB in a specific frequency resource ( Figure 8B SSB#64-#127 in .

[0151] exist Figure 8B In the example shown, even when the number of SSBs set for UE is N×64, the periods of SSBs for UE#1 and UE#2 can be the same (equal) as the existing specifications (up to Rel.15 / 16 / 17).

[0152] exist Figure 8B In the case shown, it is possible to set not to perform measurement other than the measurement target, thereby reducing power consumption.

[0153] The UE may also decide in Option 2 to either receive / measure / detect / search all of the configured SSBs (operation A) or receive / measure / detect / search only a portion of the configured SSBs (operation B). The UE may also switch in Option 2 to either receive / measure / detect / search all of the configured SSBs (operation A) or receive / measure / detect / search only a portion of the configured SSBs (operation B).

[0154] <First embodiment>

[0155] The first embodiment relates to an initial access operation.

[0156] The UE may also search all beams when receiving the first SSB (at the time of initial access). In addition, the UE may also search a part (specific) beam when receiving the first SSB (at the time of initial access).

[0157] During initial access, PRACH resources / preamble codes corresponding to SSBs may also be set. The number of SSBs set / sent may be equal to the number of PRACH resources / preamble codes.

[0158] At the time of initial access, the number of random access response (RAR) reception windows may be smaller than the number of SSBs to be set / sent. One RAR reception window may correspond to multiple PRACH resources / preamble codes.

[0159] After RRC connection, the UE can also be instructed about the beam (TCI status / QCL) from the NW.

[0160] The UE may also use a portion of the SSBs (SSB subset) for beam measurement / reporting based on the indicated TCI state.

[0161] The UE can also perform beam failure detection / radio link failure detection based on the indicated TCI status or the TCI status of the PDCCH.

[0162] The UE may also determine the candidate beam in beam failure recovery based on the indicated TCI state or the TCI state of the PDCCH. For example, the UE may also use a portion of the SSB (SSB subset) to determine the candidate beam. If the UE cannot detect a new beam exceeding a specific quality in the SSB subset, the UE may also change (switch) the SSB subset to search / determine the candidate beam.

[0163] The updating (switching) of the SSB subset to be measured may be performed using higher layer signaling (RRC / MAC CE) / DCI.

[0164] For example, the SSB subset to be measured may be updated (switched) in combination with / based on the indicated TCI state of the unified TCI state specified in Rel.17.

[0165] The following describes the method for determining the above-mentioned SSB subset.

[0166] In Rel.15, the UE measures all configured / specified SSBs and reports / uses the beam with the best measurement result. When sending the random access channel (RACH), the UE sends the PRACH in the physical random access channel (PRACH) timing corresponding to the SSB with the highest received power. In the layer 1 (L1) beam report after the RRC connection is established, the UE reports to the base station: 1 / 2 / 4 SSB resource indicators (SSBRI) / CSI-RS resource indicators (CSI-RS resource indicator (CRI)) with the highest L1 reference signal received power (L1-reference signal received power (RSRP)) / L1 signal to interference and noise ratio (L1-signal-to-interference and noise ratio (SINR)) among the configured SSB / CSI-RS, and the values ​​of L1-RSRP / L1-SINR.

[0167] If the number of beams increases, it will take time to explore all beams, which is inefficient. When switching beams, it is assumed that the current beam is switched to its adjacent beam, so the UE does not need to explore all beams. Fig. 9 In the example, it can be expected that the beam of SSB #9 in use among SSB #0 to #16 within the coverage area of ​​TRP (cell) #1 will be switched to any of its adjacent SSB #4, #5, #6, #8, #10, #13, #14, and #15.

[0168] The UE may also select a specific (measurement object) SSB from all (set / specified) SSBs and perform reception / measurement / detection of the specific SSB.

[0169] The opportunity for receiving / measuring / detecting SSB can also be at least one or all of the following: measuring / reporting L1-RSRP / L1-SINR / L3-RSRP / L3-SINR, determining the PRACH timing for PRACH transmission, measuring new beam RS in BFR, and measuring event-based beam reporting. The UE can also report to the base station the indexes of the first X measurement results in the SSB index of the measurement object.

[0170] The index of the current (in use) SSB can 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 the unified TCI state (common TCI state), or the SSB / CSI-RS index (SSBRI / CRI) corresponding to the index of the best beam reported through the L1-RSRP / L1-SINR beam report.

[0171] The method for selecting a specific SSB may also follow at least one of the following selection methods 1 and 2.

[0172] [Selection method 1]

[0173] The corresponding relationship between the index of the current SSB and the index of the SSB of the measurement object (association, relationship of state transition from the index of the current SSB to the index of the SSB of the measurement object) can also be notified / set. Fig.10 In the example, the correspondence relationship can also represent the association of the current index of each SSB to the index of one or more SSBs of the measurement object.

[0174] When determining whether to perform beam switching, the UE may also determine whether the measurement result of the SSB of the measured object is better or worse than the measurement result of the current SSB. Even if the index of the SSB of the measured object is not explicitly notified, the index of the SSB of the measured object may include the index of the current SSB. However, when determining the new beam RS in BFR, the index of the current SSB corresponds to a beam with a fault (failed beam), and therefore may not be included in the index of the SSB of the measured object.

[0175] [Selection method 2]

[0176] The UE may also determine the index of the (specific) SSB to be measured (the index of multiple SSBs) from the index of the current SSB according to the rule. The rule may also be at least one of the following rules 1 to 4.

[0177] 〔〔Rule 1〕〕

[0178] When the group in the first embodiment is specified, the index of the SSB to be measured may be the index of all SSBs in the group including the index of the current SSB, or the index of the SSB in the group except the index of the current SSB. Fig.11AIn the example, the current SSB#1 is included in group#1. The UE may also select SSB#0 to SSB#63 in group#1 which is the same as the current SSB as the measurement object.

[0179] By limiting the number of SSBs of the measurement object to less than a specific number of SSBs in one period / cycle, the UE can receive / measure / detect all SSBs of the measurement object in one period / cycle. The specific number may also be the number of SSBs in one group.

[0180] The number of SSBs of the measurement object may not be limited to less than a specific number of SSBs in one period / cycle. In this case, the UE may receive one SSB in the same symbol and perform reception / measurement / detection of all SSBs of the measurement object across multiple periods / cycles, or may use multiple panels to receive multiple SSBs in the same symbol and perform reception / measurement / detection of all SSBs of the measurement object in one period / cycle.

[0181] 〔〔Rule 2〕

[0182] The index of the SSB of the measurement object can be the index of a certain number of SSBs before and after the index of the current SSB, or the index of a certain number of SSBs within the range including the index of the current SSB. For example, when the index of the current SSB is m and the number of indexes of the SSBs of the measurement object is N, the index of the SSB of the measurement object can also range from the index of the SSB m-floor (N / 2) to the index of the SSB m+ceil (N / 2)-1 of the N SSBs.

[0183] The calculation formula for the index of the SSB of the measurement object is not limited to this formula. The index of the SSB of the measurement object can be the index of N+1 SSBs from the index m-floor(N / 2) of the SSB to the index m+ceil(N / 2) of the SSB (with the index m of the current SSB as the center), or it can be the index of N SSBs excluding the index m of the current SSB among the index of N+1 SSBs from the index m-floor(N / 2) of the SSB to the index m+ceil(N / 2) of the SSB (with the index m of the current SSB as the center). In addition, floor / ceil / round can also be used instead of floor / ceil. When the index of the current SSB is set to be D away from m, the index of the SSB of the measurement object may be the index of 2D+1 SSBs (centered on the index m of the current SSB) from the index mD of the SSB to the index m+D of the SSB, or the index of 2D SSBs (centered on the index m of the current SSB) from the index mD of the SSB to the index m+D of the SSB, excluding the index m of the current SSB. The index of the SSB of the measurement object may also be an index at a specific interval (e.g., 2) (centered on the index m of the current SSB).

[0184] In order to prevent the SSB index p obtained by the calculation formula from exceeding the number of SSB indexes Q or becoming a negative number, the index of the SSB to be measured is given by mod(p,Q).

[0185] It is also possible not to use the SSB group. Fig. 11B In the example, when SSB#0 to #191 are sent, the current SSB is SSB#65, and the number N of SSBs of the measurement object is 5, the SSB of the measurement object can also be SSB#63 to #67.

[0186] The indexes of the SSBs of the measurement object may also be non-continuous. For example, the indexes of the SSBs of the measurement object may be separated by one index.

[0187] 〔〔Rule 3〕〕

[0188] The SSB to be measured may also be an SSB that is adjacent to the current SSB on the time axis and adjacent to the current SSB on the frequency axis (an SSB that is adjacent to the current SSB in the time / frequency plane). Fig. 12A In the example, groups #0 to #2 are transmitted, and groups #0 to #2 each include SSB #0 to #63. The current SSB is SSB #1 of group #1, and the SSBs of the measurement object include SSB #0 to #2 of group #0, SSB #0 to #2 of group #1, and SSB #0 to #2 of group #2.

[0189] In this case, the SSB of the measurement object may also include multiple SSBs in the same symbol. In this case, the UE may receive one SSB in the same symbol and perform reception / measurement / detection of all SSBs of the measurement object across multiple periods / cycles, or may use multiple panels to receive multiple SSBs in the same symbol and perform reception / measurement / detection of all SSBs of the measurement object in one period / cycle.

[0190] 〔〔Rule 4〕〕

[0191] The SSB of the measurement object can also be determined based on the following method: n is added to the index of the time direction of the current SSB, and m is added to the index of the frequency direction of the current SSB. Fig. 12B In the example, SSB#0 to #191 are transmitted, n=1, m=1. The current SSB is SSB#0, and the SSB of the next measurement object is SSB#65 obtained by adding 1 to the index in the time direction and 1 to the index in the frequency direction. The SSB of the next measurement object is SSB#131 obtained by adding 1 to the index in the time direction and 1 to the index in the frequency direction.

[0192] 《Implementation Method 1-1》

[0193] The UE in Embodiment 1-1 may be, for example, a UE having one receiving panel or a UE using one receiving panel.

[0194] The UE may also receive a synchronization signal (SSB (PSS / SSS)). The UE may also receive a synchronization signal in a synchronization grid.

[0195] The UE may also determine resources of other SSBs after detecting the SSB (which may also be referred to as the detected SSB). The SSB may also be TDM / FDM.

[0196] The UE can also determine the TDM SSB in the same way as the existing specifications (Rel.15-17).

[0197] The UE may also determine / decide / judge the SSB to be FDMed based on a specific method.

[0198] For example, the UE may also determine / decide / judge the detected SSB and other SSBs detected by FDM based on the offset of the detected SSB.

[0199] The frequency offset may be defined in advance through specifications, may be notified through a system information block (SIB) / physical broadcast channel (PBCH), or may be set using higher layer signaling.

[0200] The frequency offset may be defined / set for each subcarrier spacing (SCS) / band / frequency range, or may be common for each of a plurality of SCSs / bands / frequency ranges.

[0201] The UE may also determine / understand the SSB index of the detected SSB.

[0202] A time / frequency mapping for SSBs may also be specified (eg, may also be referred to as a two-dimensional time / frequency mapping of SSBs). For example, when the maximum number of SSBs in the time direction is M, the SSB index of the FDMed SSBs may also be increased by M each time.

[0203] For example, when the SSB index of the SSB detected by the UE is 64, that is, the maximum number of SSBs in the time direction is 64, the UE can also judge: if the frequency offset is shifted in the negative direction of the frequency direction, there is an SSB resource with an SSB index of 0; if the frequency offset is shifted in the positive direction of the frequency direction, there is an SSB resource with an SSB index of 128.

[0204] The maximum number of SSBs in the frequency direction may be pre-defined through specifications, may be notified through SIB / PBCH, or may be set using higher layer signaling.

[0205] Fig.13 FIG. 1 is a diagram showing an example of a method for detecting SSB according to Embodiment 1-1. Fig.13 In the example shown, the UE performs a synchronization grid search and detects an SSB. Then, the UE determines the detected SSB and (the resources of) other SSBs that are FDMed based on a predefined / set frequency offset.

[0206] The following describes the number of SSBs when the UE detects SSBs.

[0207] The UE may not assume or expect to detect multiple SSBs in one synchronization grid (option 1-1-1). This can reduce the processing load of the UE.

[0208] In option 1-1-1, the frequency offset of SSB may be larger (wider) than the width of the synchronization grid. In this case, multiple SSBs that are FDMed are not detected within one synchronization grid.

[0209] In option 1-1-1, the frequency offset of the SSB may also be smaller (narrower) than the width of the synchronization grid. In this case, the UE may also detect / determine only one SSB within the synchronization grid. This one SSB may also be, for example, the most relevant (e.g., RSRP / RSRQ / SINR) SSB. The UE may also not detect SSBs other than the most relevant (e.g., RSRP / RSRQ / SINR) SSB.

[0210] The UE may also assume / expect to detect multiple SSBs within one synchronization grid (option 1-1-2). Fig.14 As shown, a frequency offset may also be specified / set so that multiple SSBs are included within the synchronization grid.

[0211] The UE may also make initial access assuming that a specific SSB (e.g., one with the highest received power / quality (e.g., RSRP / RSRQ / SINR)) is detected among multiple detected SSBs.

[0212] 《Implementation Method 1-2》

[0213] The UE in Embodiment 1-2 may be, for example, a UE having a plurality of receiving panels, or a UE using a plurality of receiving panels.

[0214] The UE may also receive a synchronization signal (SSB (PSS / SSS)). The UE may also receive a synchronization signal in a synchronization grid.

[0215] The UE may also use a plurality of synchronization grids to search for synchronization signals at the same time, thereby reducing the detection time of the synchronization signal of the UE.

[0216] The number of synchronization grids that can be searched simultaneously may also be determined based on UE capabilities.

[0217] The UE may separately (independently) change the receiving beam for each synchronization grid to search for the synchronization signal.

[0218] The frequency offset between multiple synchronization grids may also be specified. The frequency offset between the synchronization grids may be equal to or different from the value of the frequency offset described in the above-mentioned Embodiment 1-1.

[0219] The UE may also determine resources of other SSBs after detecting the SSB (also referred to as the detected SSB). The SSB may also be TDM / FDM.

[0220] The UE can also determine the TDM SSB in the same way as the existing specifications (Rel.15-17).

[0221] The UE can also determine / determine / judge the SSB subjected to FDM based on a specific method. This specific method can also be the same as at least one of the methods described in the above Embodiment 1-1.

[0222] Fig.15 It is a diagram showing an example of the SSB detection method related to Embodiment 1-2. In Fig.15 the example shown, the UE searches for multiple synchronization grids (the first synchronization grid and the second synchronization grid) to detect the SSB. Then, the UE determines the detected SSB and other SSBs (resources) subjected to FDM based on a pre-specified / set frequency offset.

[0223] When searching for multiple synchronization grids as described above, the bandwidth of the SSB is wider compared to the existing specifications, so there is a concern that the load of searching for the synchronization signal increases. It is desired to detect the SSB through as narrow a bandwidth as possible even when detecting the SSB subjected to FDM. Hereinafter, a solution to this problem will be described.

[0224] In one synchronization grid, multiple (FDM'd) SSBs can also be included. The UE can also assume / expect that multiple (FDM'd) SSBs are included in one synchronization grid.

[0225] Multiple synchronization grids can also be repeated in the frequency domain. Multiple synchronization grids can be completely repeated in the frequency domain or partially repeated.

[0226] According to this method, it is possible to narrow the frequency band measured during SSB detection and improve the power efficiency of the UE. In addition, the UE can also be a UE that can simultaneously perform multiple beam scans.

[0227] Fig.16 It is a diagram showing another example of the SSB detection method related to Embodiment 1-2. In Fig.16 the example shown, the UE searches for multiple synchronization grids (the first synchronization grid and the second synchronization grid) to detect the SSB. In Fig.16 the example shown, the first synchronization grid and the second synchronization grid are partially repeated in the frequency domain.

[0228] Hereinafter, the implementation of the UE related to reducing the processing load of the UE will be described.

[0229] [Embodiment 1-2-1]

[0230] The "load of searching for the synchronization signal" in Embodiment 1-2 can also be interpreted as the "load / memory amount for searching for the synchronization grid in the SSB period (e.g., 20 ms)".

[0231] The following description of "storage" in this embodiment is just an example. In the present disclosure, storage, UE capability, and specific function / capability may be overwritten.

[0232] As scenarios involved in the implementation of UE, consider the following scenarios 1 to 3.

[0233] [[Scenario 1]]

[0234] The UE may also search for an SSB whose number of FDMed SSBs is 1 (ie, the SSB is not FDMed) at a specific SSB period (eg, 20 ms).

[0235] In scenario 1, in the UE, a memory amount required for the UE to implement the existing specification (eg, Rel. 15) is required.

[0236] [[Scenario 2]]

[0237] The UE may also search for N SSBs of FDM SSBs with a specific SSB period (e.g., 20 ms) (refer to Fig.17A ).

[0238] The UE in scenario 2 may also be, for example, the UE involved in the above-mentioned implementation modes 1-2.

[0239] In scenario 2, in the UE, it is necessary to implement N times the amount of storage (and N times the number of receiving panels) required by the UE of the existing specification (eg, Rel. 15).

[0240] In case 2, as described above, the band of the synchronization grid may not be N times (a plurality of synchronization grids may overlap partially or completely).

[0241] [[Scenario 3]]

[0242] The UE may also search for N SSBs of FDM SSBs with a specific SSB period (eg, N×20 ms) (refer to Fig. 17B ).

[0243] The UE in scenario 3 may be, for example, the UE involved in the above-mentioned embodiment 1-1 or the UE involved in the above-mentioned embodiment 1-2.

[0244] In scenario 3, in the UE, implementation of a memory amount required for the UE of the existing specification (eg, Rel. 15) needs to be implemented.

[0245] The UE may also assume an SSB period of a different length from the existing SSB (SSB burst) period (eg, 20 ms).

[0246] A UE having / supporting the first UE capability may also assume that SSB bursts occur at an existing period (eg, 20 ms).

[0247] The UE having / supporting the first UE capability may be, for example, a UE supporting the operation of the above-mentioned embodiment 1-1. The UE having / supporting the first UE capability may be, for example, a UE supporting the operation of the above-mentioned embodiment 1-2 and having a larger (increased) memory capacity than the UE supporting the operation of the above-mentioned embodiment 1-1.

[0248] A UE having / supporting the first UE capability may also, at the time of initial access, assume that the number of FDMed SSBs is 1 (ie, the SSB is not FDMed) for reception of an SSB.

[0249] A UE having / supporting the second UE capability may also assume that the SSB burst occurs at a period (eg, N×20 ms, or 20 / N ms) different from the existing period (eg, 20 ms).

[0250] The UE having / supporting the second UE capability may be, for example, a UE supporting the operation of the above-mentioned embodiment 1-1. The UE having / supporting the first UE capability may be, for example, a UE supporting the operation of the above-mentioned embodiment 1-2 and having a larger (increased) memory capacity than the UE supporting the operation of the above-mentioned embodiment 1-1.

[0251] A UE having / supporting the second UE capability may also assume reception of N SSBs of FDM during initial access.

[0252] The UE supporting the operation of the above-mentioned embodiments 1-2 may also search for the SSB based on the realized storage amount. At this time, the SSB (burst) period may also be an existing SSB period (eg, 20 ms).

[0253] The UE may also search for every N synchronization grids. For example, a UE having a memory amount equivalent to that of a UE supporting the operation of the above-mentioned embodiment 1-2 and supporting the above-mentioned embodiment 1-1 may also search for every N synchronization grids.

[0254] The UE may also search all synchronization grids. For example, a UE having a memory capacity equivalent to that of a UE supporting the operation of the above-mentioned embodiment 1-2 and supporting the above-mentioned embodiment 1-1 may also search all synchronization grids.

[0255] In addition, in the present disclosure, the number of synchronization grids that can be measured simultaneously may be different for each UE (and may be reported to the NW through UE capabilities), or may be predefined by the specification.

[0256] In addition, in the present disclosure, each of the multiple synchronization grids can either repeat (fully repeat) with other synchronization grids in the frequency domain, not repeat, or partially repeat. Whether to support repetition / non-repetition / partial repetition of the synchronization grid can be determined based on the reported UE capabilities or can be pre-specified by the specification.

[0257] In addition, in the present disclosure, for multiple synchronization grids, the UE can also use the same reception beam (reception domain filter) to receive / detect / search. In addition, in the present disclosure, for multiple synchronization grids, the UE can also use separate reception beams (reception domain filters) to receive / detect / search.

[0258] In addition, in the present disclosure, a UE having one reception panel or a UE using one reception panel can also attempt to detect one SSB per specific period (e.g., 20 ms). In this case, when the UE fails to detect the SSB, it can also clear the storage. The storage capacity of this UE can also be the same as that required for a UE supporting existing specifications (e.g., Rel.15 / 16 / 17).

[0259] In addition, in the present disclosure, a UE having one reception panel or a UE using one reception panel can also attempt to detect N SSBs per specific period (e.g., 20 ms). In this case, the UE can also detect / determine the best (most relevant) SSB in terms of reception power / quality among the SSBs measured within the N×20 ms period. The storage capacity of this UE can also be the same as N times the storage capacity required for a UE supporting existing specifications (e.g., Rel.15 / 16 / 17).

[0260] According to Embodiment 1-2-1, the implementation of the UE for implementing the above Embodiment 1-2 can be appropriately carried out.

[0261] 《Embodiment 1-3》

[0262] In Embodiment 1-3, the time / frequency mapping for the SSB (e.g., which can also be referred to as the two-dimensional time / frequency mapping of the SSB) is described.

[0263] [Embodiment 1-3-1]

[0264] When the total number of SSBs exceeds the maximum number of SSBs that can be TDM, the SSBs can also be FDM.

[0265] The UE can also assume / expect that when the total number of SSBs exceeds the maximum number of SSBs that can be TDM, the SSBs are FDM.

[0266] The UE may also determine / judge the time / frequency mapping for the SSB based on the detected SSB index and the number of SSBs (or the maximum number of SSBs) that are FDMed (in the same time domain).

[0267] In the present disclosure, a plurality of SSBs that are TDMed (in the same frequency domain) may also be referred to as an SSB group.

[0268] Fig.18A This is a diagram showing an example of time / frequency mapping of SSB involved in implementation mode 1-3-1. Fig.18A The time / frequency mapping shown is that SSB#0 to #63 (SSB group #0), SSB#64 to #127 (SSB group #1), and SSB#128 to #191 (SSB group #2) are respectively TDMed, and SSB group #0, SSB#SSB group #1, and SSB group #2 are FDMed.

[0269] exist Fig.18A In the example shown, the UE determines the SSB based on the detected SSB (e.g., SSB#64) and the number of SSBs that are FDMed (here 3). Fig.18A The mapping of SSB is shown.

[0270] [Implementation Method 1-3-2]

[0271] Regardless of whether the total number of SSBs exceeds the maximum number of SSBs that can be TDM, SSBs can also be FDMed.

[0272] The UE may also assume / expect that the SSBs are FDMed regardless of whether the total number of SSBs exceeds the maximum number of SSBs that can be TDMed.

[0273] The UE can also determine / judge the time / frequency mapping for the SSB based on the detected SSB index, the number of SSBs (or the maximum number of SSBs) that are FDMed (in the same time domain), and the maximum number of SSBs in the time direction (the number of SSBs per SSB group).

[0274] Information related to the maximum number of SSBs in the time direction (the number of SSBs per SSB group) can be notified through SIB / PBCH or through higher-layer signaling.

[0275] Fig.18B This is a diagram showing an example of time / frequency mapping of SSB involved in implementation mode 1-3-2. Fig.18BThe time / frequency mapping shown is that SSB#0 to #31 (SSB group #0), SSB#32 to #63 (SSB group #1), and SSB#64 to #95 (SSB group #2) are respectively TDMed, and SSB group #0, SSB#SSB group #1, and SSB group #2 are FDMed.

[0276] exist Fig.18B In the example shown, the UE determines the maximum number of SSBs to be detected based on the detected SSB (e.g., SSB#32), the number of SSBs to be FDMed (here 3), and the maximum number of SSBs in the time direction (here 32). Fig.18B The mapping of SSB is shown.

[0277] According to implementation 1-3-2, compared with the above-mentioned implementation 1-3-1, even if the number of SSBs is the same as the existing specification (64), SSBs can be TDM / FDMed (SSBs can be mapped two-dimensionally in time / frequency), and the delay of initial access / beam scanning can be reduced compared with the existing specification (for example, Rel.15-17).

[0278] 《Implementation Method 1-4》

[0279] In implementation modes 1-4, the mapping in the time domain of SSB is described.

[0280] The mapping of the SSB in the time domain may also be configured for the UE using a specific parameter (eg, ssb-PositionsInBurst) indicating the time position of the SSB.

[0281] The mapping of SSB in the time domain may be set / determined for each frequency (SSB group).

[0282] In this way, SSB can be flexibly mapped in time (frequency) resources.

[0283] Fig.19A is a diagram showing an example of SSB mapping involved in Implementation 1-4. Fig.19A In the example shown, the SSBs of SSB group #0 (SSB #0-#63), the SSBs of SSB group #1 (SSB #64-#127), and the SSBs of SSB group #2 (SSB #128-#191) are separately mapped to the time domain.

[0284] The mapping of SSB in the time domain may be commonly set / determined for a plurality of (eg, all) frequencies (SSB groups).

[0285] This can reduce the overhead of signaling of the time position of the SSB (e.g., SIB1).

[0286] Fig.19B is a diagram showing another example of the mapping of SSB involved in Implementation 1-4. Fig.19B In the example shown, the SSBs of SSB group #0 (SSB #0-#63), the SSBs of SSB group #1 (SSB #64-#127), and the SSBs of SSB group #2 (SSB #128-#191) are mapped to a common time domain.

[0287] In addition, in this embodiment, although the mapping related to the time domain is described, it can also be applied to the mapping of the frequency domain in the same manner. In other words, the "time domain" in this embodiment can also be rewritten as the "frequency domain".

[0288] In addition, with respect to the SSB in the present disclosure, examples of mapping to a continuous time domain (e.g., a symbol) are shown, but these are only examples. The SSB in the present disclosure can be mapped to either a continuous time domain (e.g., a symbol) or a discontinuous time domain (e.g., a symbol).

[0289] 《Implementation Method 1-5》

[0290] In embodiments 1-5, information and notification related to time / frequency domain mapping for SSB groups are described.

[0291] More than one SSB group may correspond to a UE. In the present disclosure, the corresponding SSB group may also be referred to as the present SSB group or the first SSB group. In addition, in the present disclosure, an SSB group different from the present SSB group may also be referred to as another SSB group or the second SSB group.

[0292] The information related to the time / frequency domain mapping of the SSB group may be, for example, a specific parameter representing the time position of the SSB (e.g., ssb-PositionsInBurst) and at least one of the information related to the frequency offset described in the above-mentioned embodiments 1-1 / 1-2.

[0293] Information on the time / frequency domain mapping for the SSB group may also be notified via SIB / PBCH. For example, information on the time / frequency domain mapping for the SSB group may also be included in the serving cell configuration (eg, ServingCellConfigCommonSIB) within SIB1.

[0294] Information related to the time / frequency domain mapping for the SSB group may also be notified through higher layer signaling (RRC signaling). For example, information related to the time / frequency domain mapping for the SSB group may also be included in the serving cell configuration (e.g., ServingCellConfigCommon) of the RRC signaling.

[0295] [Implementation Method 1-5-1]

[0296] The UE may also receive information related to the mapping of the time / frequency domain for the current SSB group through notification information (eg, SIB1 / PBCH). In addition, the UE may also receive information related to the mapping of the time / frequency domain for other SSB groups through RRC signaling.

[0297] According to implementation 1-5-1, the UE does not need to know the existence of other SSB groups, and thus can reduce the payload (number of bits / size) of the notification information (eg, SIB1).

[0298] In addition, the UE may also receive information indicating whether other SSB groups exist (or information related to the total number of SSBs) through notification information (eg, SIB1).

[0299] [Implementation Method 1-5-2]

[0300] The UE may also receive information related to the mapping of the time / frequency domain for the current SSB group through notification information (e.g., SIB1 / PBCH). In addition, the UE may also receive information related to the mapping of the time / frequency domain for other SSB groups through notification information (e.g., SIB1 / PBCH).

[0301] In addition, the UE may also receive information related to other SSB groups other than information related to time / frequency domain mapping for other SSB groups through RRC signaling.

[0302] According to the above first embodiment, it is possible to appropriately receive / measure / detect / search for TDM / FDM SSB at the time of initial access.

[0303] <Second embodiment>

[0304] The second embodiment relates to the Physical Random Access Channel (PRACH).

[0305] This implementation, for example, can also be applied to the UE in option 2 above.

[0306] The N (eg, 64) SSBs configured for the UE may also be TDMed (in the same frequency domain).

[0307] The M SSBs set for the UE may also be FDMed (in the same time domain).

[0308] N×M SSBs can also be set / sent.

[0309] In this case, N×M PRACH resources / preamble codes may be defined / set.

[0310] Option 2 above can also be applied to transmission / reception using multiple TRPs / panels. In this case, for example, the UE / base station can also transmit / receive signals simultaneously via multiple beams of QCL type D.

[0311] PRACH resources can also be TDM / FDM / SDM / CDM.

[0312] SSB and PRACH resources / preambles can also correspond. The correspondence between SSB and PRACH resources / preambles can also be specified / set.

[0313] The UE can also select a PRACH resource / preamble corresponding to the detected SSB to transmit a PRACH.

[0314] The transmission beam (spatial domain filter) of the transmitted PRACH can also be the same as the reception spatial domain filter used in the reception of the detected SSB.

[0315] In the present disclosure, the PRACH can be either a PRACH in contention-based random access (CBRA) or a PRACH in contention-free random access (CFRA). For example, the present embodiment can also be applied by being limited to the PRACH of CBRA or the PRACH of CBFA.

[0316] Fig. 20 It is a diagram showing an example of PRACH resources / preambles according to the second embodiment. In Fig. 20 the example shown, 192 SSBs are set. In Fig. 20 the example shown, SSB #n and PRACH resource / preamble #n correspond. In Fig. 20 the example shown, the UE detects SSB #65 and transmits a PRACH in the corresponding PRACH resource #65.

[0317] As Fig. 20 in the example shown, PRACH resources / preambles can also be TDM and FDM / CDM / SDM.

[0318] In addition, in the above Fig. 20 it shows an example in which the corresponding SSB and PRACH are identified by the same value of index, but the corresponding SSB and PRACH can also be identified by different values of index respectively. For example, the index related to the corresponding PRACH can be derived from the SSB index based on a specific mathematical formula.

[0319] According to the above second embodiment, PRACH for SSB using TDM / FDM / SDM / CDM can be appropriately transmitted.

[0320] <Third Embodiment>

[0321] The third embodiment relates to a Random Access Response (RAR).

[0322] This implementation, for example, can also be applied to the UE in option 2 above.

[0323] This embodiment can also be applied to, for example, the RAR transmitted for the PRACH described in the second embodiment.

[0324] The number of resources (eg, RAR windows) used for receiving RAR may also be less than N×M. For example, the number of resources (eg, RAR windows) used for receiving RAR may also be N.

[0325] The UE may also attempt RAR reception in the RAR window corresponding to the transmitted PRACH.

[0326] The UE may also use the received spatial domain filter of the detected SSB (or the received spatial domain filter that is the same as the transmitted spatial domain filter of the transmitted PRACH) to receive the corresponding RAR.

[0327] The setting of the RAR window (for example, ra-ResponseWindow included in SIB1) may also be set for each SSB. In addition, the setting of the RAR window (for example, ra-ResponseWindow included in SIB1) may also be set for each multiple SSB. The multiple SSBs may also be multiple SSBs that are FDMed in the same time domain.

[0328] Fig.21 FIG. 4 is a diagram showing an example of RAR according to the third embodiment. Fig.21 In the example shown, the UE detects the SSB (SSB#65) and transmits the PRACH (PRACH#65) corresponding to the detected SSB. Fig.21 In the example shown, 64 SSB / PRACH are TDMed.

[0329] exist Fig.21 In the example shown, SSB / PRACH#n corresponds to RAR window #n-64×m (m=0, 1, 2). The UE attempts RAR reception in RAR window #1 corresponding to PRACH#65.

[0330] In addition, the number of resources (eg, RAR windows) for receiving RAR may also be N × M. For example, the resources for receiving RAR may also be defined as a mapping in the time / frequency direction (time / frequency two-dimensional mapping).

[0331] Fig. 22 FIG. 4 is a diagram showing another example of the RAR according to the third embodiment. Fig. 22 In the example shown, the UE detects the SSB (SSB#65) and transmits the PRACH (PRACH#65) corresponding to the detected SSB. Fig. 22 In the example shown, 64 SSB / PRACH are TDMed.

[0332] exist Fig. 22 In the example shown, SSB / PRACH#n corresponds to RAR window#n. The UE attempts RAR reception in RAR window#65 corresponding to PRACH#65.

[0333] In addition, in the above Fig.21 as well as Fig. 22 , an example is shown in which the corresponding SSB, PRACH, and RAR window are identified by the same index value, but the corresponding SSB, PRACH, and RAR window may also be identified by indexes of different values. For example, at least one of the corresponding SSB index, the corresponding PRACH-related index, and the corresponding RAR window index may be derived based on a specific mathematical formula from any one of the SSB index, the PRACH-related index, and the corresponding RAR window index.

[0334] According to the third embodiment described above, it is possible to appropriately receive RAR for SSB / PRACH using TDM / FDM / SDM / CDM.

[0335] <Supplement>

[0336] [Notification of information to UE]

[0337] The notification of arbitrary information (from the network (Network (NW)) (for example, the base station (Base Station (BS)))) to the UE (in other words, the reception of arbitrary information from the BS in the UE) in the above-mentioned embodiment can also be carried out using physical layer signaling (for example, DCI), high-layer signaling (for example, RRC signaling, MAC CE), specific signals / channels (for example, PDCCH, PDSCH, reference signals), or a combination thereof.

[0338] When the above notification is performed through MAC CE, the MAC CE can also be identified by the fact that a new logical channel ID (Logical Channel ID (LCID)) that is not specified in the existing standard is included in the MAC subheader.

[0339] In the case where the above-mentioned notification is performed through MAC CE, the above-mentioned notification may also be performed through a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used in scrambling the cyclic redundancy check (CRC) bits assigned to the DCI, the format of the DCI, etc.

[0340] In addition, the notification of arbitrary information to the UE in the above-mentioned embodiments may be performed periodically, semi-continuously, or aperiodically.

[0341] [Notification of information from UE]

[0342] The notification of arbitrary information from the UE (to the NW) in the above-mentioned embodiment (in other words, the sending / reporting of arbitrary information from the UE to the BS) can also be carried out using physical layer signaling (e.g., UCI), high-layer signaling (e.g., RRC signaling, MAC CE), specific signals / channels (e.g., PUCCH, PUSCH, PRACH, reference signals), or a combination thereof.

[0343] In the case where the above notification is performed through MAC CE, the MAC CE can also be identified by the fact that a new LCID that is not specified in the existing standard is included in the MAC subheader.

[0344] When the notification is performed through UCI, the notification may be transmitted using PUCCH or PUSCH.

[0345] In addition, the notification of arbitrary information from the UE in the above-mentioned embodiments may be performed periodically, semi-continuously, or aperiodically.

[0346] [Application to each embodiment]

[0347] At least one of the above-mentioned embodiments may be applied when a specific condition is satisfied. The specific condition may be specified in the standard or may be notified to the UE / BS using higher layer signaling / physical layer signaling.

[0348] At least one of the above-mentioned embodiments may be applied only to a UE that reports a specific UE capability (UE capability) or supports the specific UE capability.

[0349] The specific UE capability may also represent at least one of the following:

[0350] Support for specific processing / operation / control / information for at least one of the above embodiments (e.g., reception of more than 64 SSBs, reception of TDM / FDM SSBs),

[0351] Supports sending and receiving using multiple receiving / sending panels,

[0352] The number of SSBs in the time / frequency direction supported (maximum number).

[0353] In addition, the above-mentioned specific UE capabilities can be capabilities that are applied across all frequencies (commonly regardless of frequency), or capabilities for each frequency (for example, one or a combination of cells, bands, band combinations, BWPs, component carriers, etc.), or capabilities for each frequency range (for example, Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or capabilities for each subcarrier spacing (SubCarrier Spacing (SCS)), or capabilities for each feature set (Feature Set (FS)) or feature set of each component carrier (Feature Set Per Component-carrier (FSPC)).

[0354] In addition, the above-mentioned specific UE capabilities can be capabilities applied across full-duplex modes (commonly regardless of the duplex mode) or capabilities of each duplex mode (for example, time division duplex (TDD) and frequency division duplex (FDD)).

[0355] In addition, at least one of the above-mentioned embodiments may also be applied to a case where the UE is set / activated / triggered with specific information associated with the above-mentioned embodiments (or the operation of the above-mentioned embodiments is implemented) through high-layer signaling / physical layer signaling. For example, the specific information may also be information indicating activation of reception of more than 64 SSBs, information indicating activation of reception of TDM / FDM SSBs, any RRC parameter for a specific version (e.g., Rel.18 / 19), etc.

[0356] The UE may also apply operations such as Rel.15 / 16 when it does not support at least one of the above-mentioned specific UE capabilities or the above-mentioned specific information is not configured.

[0357] (Supplement A)

[0358] The following inventions are added to one embodiment of the present disclosure.

[0359] [Supplement A-1]

[0360] A terminal having:

[0361] a control unit that determines either an operation of searching for SSBs of all SSB indexes in a plurality of synchronization signal blocks (SSB) groups or an operation of searching for SSBs of specific SSB indexes in the plurality of SSB groups, wherein the plurality of SSB groups are frequency-division multiplexed and one SSB group includes a plurality of SSBs that are time-division multiplexed; and

[0362] The receiving unit detects one SSB within the plurality of SSB groups.

[0363] [Supplement A-2]

[0364] As described in Appendix A-1,

[0365] The control unit determines the SSB that is frequency-division-multiplexed for the detected one SSB based on the frequency offset of the SSB.

[0366] [Supplement A-3]

[0367] For terminals listed in Appendix A-1 or Appendix A-2,

[0368] The control unit searches for at least one of the plurality of SSBs in the plurality of SSB groups using a plurality of synchronization grids.

[0369] [Supplement A-4]

[0370] Any terminal listed in any of Appendix A-1 to Appendix A-3,

[0371] The control unit searches for at least one of the plurality of SSBs in the plurality of SSB groups using a plurality of synchronization grids,

[0372] The plurality of synchronization grids are at least partially repeated in the frequency domain.

[0373] (Supplementary Note B)

[0374] The following inventions are added to one embodiment of the present disclosure.

[0375] [Supplementary Note B-1]

[0376] A terminal having:

[0377] A receiving unit that receives one SSB out of a plurality of SSBs within a plurality of SSB groups, where the plurality of SSB groups are frequency-division multiplexed, and one SSB group includes a plurality of SSBs that are time-division multiplexed; and

[0378] A control unit that determines one physical random access channel (PRACH) resource corresponding to the one SSB from among a plurality of PRACH resources corresponding to the plurality of synchronization signals within the plurality of SSB groups.

[0379] [Appendix B-2]

[0380] A terminal as described in Appendix B-1,

[0381] where the plurality of PRACH resources are a plurality of PRACH resources that are frequency-division multiplexed and time-division multiplexed.

[0382] [Appendix B-3]

[0383] A terminal as described in Appendix B-1 or Appendix B-2,

[0384] where the control unit determines a random access response (RAR) window corresponding to the one PRACH resource, and the RAR window is one RAR window out of a plurality of RAR windows that are time-division multiplexed.

[0385] [Appendix B-4]

[0386] A terminal as described in any one of Appendix B-1 to Appendix B-3,

[0387] where the control unit determines a random access response (RAR) window corresponding to the one PRACH resource, and the RAR window is one RAR window out of a plurality of RAR windows that are time-division multiplexed and frequency-division multiplexed.

[0388] (Wireless communication system)

[0389] Hereinafter, the structure of a wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, any one or a combination of the wireless communication methods according to the above-described embodiments of the present disclosure is used for communication.

[0390] Fig.231 is a diagram showing an example of a schematic structure of a wireless communication system involved in one embodiment. The wireless communication system 1 (may also be simply referred to as system 1) may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5G NR), and the like.

[0391] In addition, the wireless communication system 1 can also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA))) and NR (E-UTRA-NR Dual Connectivity (E-UTRA-NR Dual Connectivity (EN-DC))), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC))), etc.

[0392] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the master node (Master Node (MN)), and the base station (gNB) of NR is the secondary node (Secondary Node (SN)). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0393] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both MN and SN are NR base stations (gNB)).

[0394] The wireless communication system 1 may also include a base station 11 that forms a macro cell C1 with a relatively wide coverage, and a base station 12 (12a-12c) that is configured in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located in at least one cell. The configuration and number of each cell and user terminal 20 are not limited to the method shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as base stations 10.

[0395] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).

[0396] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (below 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to these. For example, FR1 may also be equivalent to a frequency band higher than FR2.

[0397] Furthermore, the user terminal 20 may perform communication in each CC using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0398] Multiple base stations 10 may also be connected via wired (e.g., optical fiber based on Common Public Radio Interface (CPRI)), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, the base station 11 equivalent to the upper station may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to a relay station (relay) may also be referred to as an IAB node.

[0399] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0400] The core network 30 may also include network functions (NF) such as User Plane Function (UPF), Access and Mobility Management Function (AMF), Session Management Function (SMF), Unified Data Management (UDM), Application Function (AF), Data Network (DN), Location Management Function (LMF), Operation, Administration and Maintenance (Management) (OAM), etc. In addition, multiple functions may be provided by one network node. In addition, communication with an external network (e.g., the Internet) may also be performed via a DN.

[0401] The user terminal 20 may also be a terminal that supports at least one of communication modes such as LTE, LTE-A, and 5G.

[0402] In the wireless communication system 1, a wireless access method based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), 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.

[0403] The radio access scheme may also be referred to as a waveform. In addition, in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the radio access schemes for UL and DL.

[0404] As downlink channels, the wireless communication system 1 may use a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH))), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc.

[0405] In addition, as uplink channels, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20), an uplink control channel (Physical Uplink Control Channel (PUCCH))), a random access channel (Physical Random Access Channel (PRACH)) and the like can also be used in the wireless communication system 1.

[0406] User data, high-layer control information, system information block (SIB), etc. are transmitted through PDSCH. User data, high-layer control information, etc. can also be transmitted through PUSCH. In addition, master information block (MIB) can also be transmitted through PBCH.

[0407] The lower layer control information may also be transmitted via the PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of the PDSCH and the PUSCH.

[0408] In addition, the DCI for scheduling the PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling the PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may also be rewritten as DL data, and the PUSCH may also be rewritten as UL data.

[0409] In the detection of PDCCH, the control resource set (CORESET) and the search space can also be used. CORESET corresponds to the resources for searching DCI. The search space corresponds to the search area and search method of PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space setting.

[0410] A search space may also correspond to a PDCCH candidate corresponding to one or more aggregation levels. One or more search spaces may also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting" and the like in the present disclosure may also be rewritten mutually.

[0411] Uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also known as hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) can also be transmitted through PUCCH. The random access preamble used to establish a connection with a cell can also be transmitted through PRACH.

[0412] In the present disclosure, downlink, uplink, etc. may be expressed without the word “link.” In addition, various channels may be expressed without the word “physical” at the beginning.

[0413] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. can also be transmitted. As DL-RS, in the wireless communication system 1, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. can also be transmitted.

[0414] 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 also be referred to as SS / PBCH block, SS block (SSB), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0415] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. can also be transmitted. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0416] (Base Station)

[0417] Fig.24 1 is a diagram showing an example of a structure of a base station involved in one embodiment. The base station 10 includes a control unit 110, a transmitting and receiving unit 120, a transmitting and receiving antenna 130, and a transmission path interface (transmission line interface) 140. In addition, the control unit 110, the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission path interface 140 may each be provided with more than one.

[0418] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also conceivable that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0419] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0420] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc. using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be sent as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting, release, etc.) of communication channels, state management of the base station 10, management of wireless resources, etc.

[0421] The transmitting and receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measuring unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting and receiving unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0422] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0423] The transmitting / receiving antenna 130 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0424] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channel, uplink reference signal, etc.

[0425] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0426] The sending and receiving unit 120 (sending processing unit 1211), for example, may also perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 110 to generate a bit string to be sent.

[0427] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), discrete Fourier transform (Discrete Fourier Transform (DFT)) processing (as needed), inverse fast Fourier transform (Inverse Fast Fourier Transform (IFFT)) processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0428] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0429] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may also perform amplification, filter processing, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 130 .

[0430] The sending and receiving unit 120 (receiving processing unit 1212) can also apply analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to obtain user data, etc.

[0431] The transmitting and receiving unit 120 (measuring unit 123) may also implement measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (Radio Resource Management (RRM)) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also measure received power (e.g., reference signal received power (Reference Signal Received Power (RSRP))), received quality (e.g., reference signal received quality (Reference Signal Received Quality (RSRQ)), signal to interference plus noise ratio (Signal to Interference plus Noise Ratio (SINR)), signal to noise ratio (Signal to Noise Ratio (SNR))), signal strength (e.g., received signal strength indicator (Received Signal Strength Indicator (RSSI))), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0432] The transmission path interface 140 can also send and receive signals (return signaling) between devices included in the core network 30 (for example, network nodes providing NF), other base stations 10, etc., to obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0433] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission and reception unit 120 , the transmission and reception antenna 130 , and the transmission path interface 140 .

[0434] The control unit 110 may also instruct any one of an operation of searching for SSBs of all SSB indexes within a plurality of synchronization signal blocks (SSB) groups and an operation of searching for SSBs of specific SSB indexes within the plurality of SSB groups. The plurality of SSB groups may also be frequency-division multiplexed, and one SSB group may also include a plurality of SSBs that are time-division multiplexed. The transmitting and receiving unit 120 may also transmit the SSBs within the plurality of SSB groups (the zeroth and first embodiments).

[0435] The transmitting and receiving unit 120 may also transmit a plurality of SSBs within a plurality of SSB groups. The plurality of SSB groups may also be frequency-division multiplexed, and one SSB group may also include a plurality of SSBs that are time-division multiplexed. The control unit 110 may also control reception of a PRACH transmitted using one PRACH resource corresponding to one SSB among the plurality of SSBs, among a plurality of physical random access channel (PRACH) resources corresponding to the plurality of synchronization signals within the plurality of SSB groups (first and second embodiments).

[0436] (User Terminal)

[0437] Fig.25 2 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. In addition, the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may each be provided with one or more.

[0438] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also conceivable that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0439] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0440] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 220.

[0441] The transmitting and receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measuring unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting and receiving unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0442] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be configured as a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0443] The transmitting / receiving antenna 230 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0444] The transmitting and receiving unit 220 may also receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0445] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0446] The sending and receiving unit 220 (sending processing unit 2211) can also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0447] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0448] In addition, whether to apply DFT processing may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is valid (enabled), the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing without performing DFT processing.

[0449] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0450] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may perform amplification, filter processing, demodulation into a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 230 .

[0451] The sending and receiving unit 220 (receiving processing unit 2212) can also apply analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0452] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to the received signal. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, 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 also be output to the control unit 210.

[0453] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0454] The control unit 210 may also determine any one of an operation of searching for SSBs of all SSB indexes within a plurality of synchronization signal blocks (SSB) groups and an operation of searching for SSBs of specific SSB indexes within the plurality of SSB groups. The plurality of SSB groups may also be frequency-division multiplexed, and one SSB group may also include a plurality of SSBs that are time-division multiplexed. The transmitting and receiving unit 220 may also detect one SSB within the plurality of SSB groups (the zeroth and first embodiments).

[0455] The control unit 210 may determine the SSB that is frequency-division-multiplexed with respect to the detected one SSB based on the frequency offset of the SSB (first embodiment).

[0456] The control unit 210 may search for at least one of the plurality of SSBs in the plurality of SSB groups using a plurality of synchronization grids (first embodiment).

[0457] The control unit 210 may search for at least one of the plurality of SSBs in the plurality of SSB groups using a plurality of synchronization grids. The plurality of synchronization grids may also overlap at least partially in the frequency domain (first embodiment).

[0458] The transmitting and receiving unit 220 may also receive one SSB among multiple SSBs in multiple SSB groups. The multiple SSB groups may also be frequency-division multiplexed, and one SSB group may also include multiple SSBs that are time-division multiplexed. The control unit 210 may also determine one physical random access channel (PRACH) resource corresponding to the one SSB from multiple PRACH resources corresponding to the multiple synchronization signals in the multiple SSB groups (first and second embodiments).

[0459] The plurality of PRACH resources may be frequency-division multiplexed and time-division multiplexed PRACH resources (second embodiment).

[0460] The control unit 210 may also determine a random access response (RAR) window corresponding to the one PRACH resource. The RAR window may also be one RAR window among a plurality of RAR windows that are time-division multiplexed (second embodiment).

[0461] The control unit 210 may also determine a random access response (RAR) window corresponding to the one PRACH resource. The RAR window may also be one RAR window among a plurality of RAR windows that are time-division multiplexed and frequency-division multiplexed (second embodiment).

[0462] (Hardware Structure)

[0463] In addition, the block diagram used in the description of the above-mentioned embodiment shows a block of a functional unit. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more devices that are physically or logically separated can be directly or indirectly (for example, by wired, wireless, etc.) connected and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0464] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method thereof is not particularly limited.

[0465] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Fig.26 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0466] In addition, in the present disclosure, the terms such as device, circuit, equipment, section, unit, etc. can be interchangeably used. The hardware structure of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured to exclude some of the devices.

[0467] For example, only one processor 1001 is shown, but there may be multiple processors. In addition, the processing may be performed by one processor, or may be performed by two or more processors simultaneously, sequentially, or in other ways. In addition, the processor 1001 may also be implemented by one or more chips.

[0468] The functions of the base station 10 and the user terminal 20 are realized, for example, by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0469] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), the sending and receiving unit 120 (220), etc. may also be implemented by the processor 1001.

[0470] In addition, the processor 1001 reads the program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes based on them. As a program, a program that causes a computer to perform at least a part of the operations described in the above-mentioned embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the same can be implemented for other functional blocks.

[0471] The memory 1002 may also be a computer-readable recording medium, for example, composed of at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), or other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing the wireless communication method involved in one embodiment of the present disclosure.

[0472] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray (Blu-ray) (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, or at least one of other suitable storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0473] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, etc. In order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)), the communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-mentioned transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. may also be realized by the communication device 1004. The transmitting and receiving unit 120 (220) may also be realized by physically or logically separating the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0474] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0475] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between the devices.

[0476] In addition, the base station 10 and the user terminal 20 may also be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA), and the hardware may be used to implement a part or all of each functional block. For example, the processor 1001 may also be implemented using at least one of these hardware.

[0477] (Variation Example)

[0478] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may also be replaced with terms having the same or similar meanings. For example, channels, code elements, and signals (signals or signaling) may also be rewritten with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, and may also be referred to as a pilot, a pilot signal, etc. depending on the standard applied. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0479] A wireless frame may also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) constituting a wireless frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) that is not dependent on a parameter set (numerology).

[0480] Here, the parameter set may also be a communication parameter applied in at least one of the transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of a subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, a wireless frame structure, a specific filter processing performed by a transmitter and receiver in the frequency domain, a specific windowing processing performed by a transmitter and receiver in the time domain, and the like.

[0481] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0482] A time slot may also include multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0483] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective names. In addition, time units such as frames, subframes, time slots, mini-time slots, and symbols in the present disclosure may also be replaced with each other.

[0484] For example, a subframe may be referred to as a TTI, a plurality of consecutive subframes may be referred to as a TTI, and a time slot or a mini time slot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI may be referred to as a time slot, a mini time slot, etc. instead of a subframe.

[0485] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited to this.

[0486] TTI may also be a transmission time unit for a data packet (transport block), a code block, a code word, etc. that has been channel-coded, and may also be a processing unit for scheduling, link adaptation, etc. In addition, when TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0487] In addition, when a time slot or a mini time slot is called TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) can also be the minimum time unit of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling can also be controlled.

[0488] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0489] In addition, a long TTI (e.g., normal TTI, subframe, etc.) can also be rewritten as a TTI with a time length exceeding 1 ms, and a short TTI (e.g., shortened TTI, etc.) can also be rewritten as a TTI with a TTI length shorter than that of the long TTI and longer than 1 ms.

[0490] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB may also be the same regardless of the parameter set, for example, 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0491] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks, respectively.

[0492] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.

[0493] In addition, a resource block may be composed of one or more resource elements (RE). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0494] Bandwidth Part (BWP) (also referred to as partial bandwidth, etc.) may also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, common RBs may also be identified by the index of the RBs based on the common reference point of the carrier. PRBs may also be defined in a BWP and numbered within the BWP.

[0495] 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 in one carrier.

[0496] At least one of the set BWPs may be activated, and the UE may not assume that it will transmit or receive a specific signal / channel other than the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be rewritten as "BWP".

[0497] In addition, the above-mentioned structures such as radio frames, subframes, time slots, mini-time slots and symbols are only examples. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

[0498] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may also be indicated by a specific index.

[0499] In the present disclosure, the names used for parameters, etc. are not restrictive in all respects. Furthermore, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not restrictive in all respects.

[0500] Information, signals, etc. described in this disclosure may also be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0501] Furthermore, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0502] The input and output information, signals, etc. may be stored in a specific location (e.g., a memory), or may be managed using a management table. The input and output information, signals, etc. may be overwritten, updated, or appended. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be sent to other devices.

[0503] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI))), uplink control information (Uplink Control Information (UCI))), high-layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB)), System Information Block (SIB)), etc.), Medium Access Control (MAC) signaling), other signals or a combination thereof.

[0504] In addition, physical layer signaling may also be referred to as layer 1 / layer 2 (Layer 1 / Layer 2 (L1 / L2)) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, such as an RRC connection establishment (RRC Connection Setup) message, an RRC connection reconstruction (RRC Connection Reconfiguration) message, etc. In addition, MAC signaling may also be notified using, for example, a MAC control element (MACControl Element (CE)).

[0505] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0506] The determination can be made by a value represented by a bit (0 or 1), by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a specific value).

[0507] Whether software is called software, firmware, middle-ware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, program, sub-program, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, etc.

[0508] In addition, software, instructions, information, etc. may also be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0509] The terms "system" and "network" used in the present disclosure can be used interchangeably. "Network" may also refer to a device (eg, a base station) included in the network.

[0510] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission 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" can be used interchangeably.

[0511] In the present 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" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, micro-micro cell, and micro-micro cell.

[0512] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within the coverage area.

[0513] In the present disclosure, the base station sending information to the terminal and the base station instructing the terminal to control / operate based on the information may also be rewritten.

[0514] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” can be used interchangeably.

[0515] There are also cases where a mobile station is referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand set, user agent, mobile client, client or several other appropriate terms.

[0516] At least one of the base station and the mobile station may also be referred to as a transmission device, a reception device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station may be a device mounted on a moving object, a moving object body, etc.

[0517] The mobile body refers to a movable object, and the moving speed is arbitrary, and of course it also includes the situation where the mobile body stops. The mobile body includes, for example, vehicles, transport vehicles, cars, automatic two-wheeled vehicles, bicycles, networked cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, trailers, rickshaws, ships (ships and other watercrafts), airplanes, rockets, artificial satellites, drones, multi-rotor aircraft, quadcopters, balloons and objects carried by them, and are not limited to these. In addition, the mobile body can also be a mobile body that moves autonomously based on operating instructions.

[0518] The mobile body may be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile body that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move when performing a communication operation. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0519] Fig. 27 1 is a diagram showing an example of a vehicle according to an 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, an air 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.

[0520] The driving unit 41 is composed of at least one of an engine, a motor, or a combination of an engine and a motor. The steering unit 42 is composed of at least a steering wheel (also called a steering wheel), and performs steering of 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.

[0521] The electronic control unit 49 may also be composed of a microprocessor 61, a memory (ROM, RAM) 62, and a communication port (for example, an input / output (IO) port) 63. Signals from various sensors 50-58 provided in the vehicle are input to the electronic control unit 49. The electronic control unit 49 may also be referred to as an ECU (Electronic Control Unit).

[0522] The signals from the various sensors 50-58 include a current signal from a current sensor 50 for sensing the current of the motor, a speed signal of the front wheels 46 / rear wheels 47 obtained by a speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of the shift lever 45 obtained by a shift lever sensor 57, a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58, and the like.

[0523] The information service unit 59 is composed of various devices such as a car navigation system, an audio system, a speaker, a display, a television, and a radio for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 59 uses information obtained from an external device via the communication module 60, etc. to provide various information / services (for example, multimedia information / multimedia services) to the occupants of the vehicle 40.

[0524] The information service unit 59 may include input devices for accepting input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.), and may also include output devices for implementing output to the outside (e.g., display, speaker, LED light, touch panel, etc.).

[0525] The driving assistance system unit 64 is composed of various devices for providing functions for preventing accidents before they happen or reducing the driver's driving load, such as millimeter wave radar, light detection and ranging (LiDAR), camera, positioning device (for example, Global Navigation Satellite System (GNSS)), map information (for example, high-precision (High Definition (HD))) map, autonomous vehicle (Autonomous Vehicle (AV)) map, etc.), gyroscope system (for example, inertial measurement unit (Inertial Measurement Unit (IMU))), inertial navigation unit (Inertial Navigation System (INS))), artificial intelligence (Artificial Intelligence (AI)) chip, AI processor, and one or more ECUs that control these devices. In addition, the driving assistance system unit 64 sends and receives various information via the communication module 60 and realizes driving assistance function or autonomous driving function.

[0526] The communication module 60 can communicate with the microprocessor 61 and the components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) between the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the left and right front wheels 46, the left and right rear wheels 47, the axle 48, the microprocessor 61 and the memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58 of the vehicle 40 via the communication port 63.

[0527] The communication module 60 can be controlled by the microprocessor 61 of the electronic control unit 49, and is a communication device that can communicate with an external device. For example, various information is sent and received between external devices via wireless communication. The communication module 60 can be located either inside or outside the electronic control unit 49. The external device can also be, for example, the above-mentioned base station 10, user terminal 20, etc. In addition, the communication module 60 can also be, for example, at least one of the above-mentioned base station 10 and user terminal 20 (it can also function as at least one of the base station 10 and user terminal 20).

[0528] The communication module 60 may also transmit at least one of the signals from the various sensors 50-58 input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may also be referred to as an input unit that receives input. For example, the PUSCH transmitted through the communication module 60 may also include information based on the above input.

[0529] The communication module 60 receives various information (traffic information, signal information, vehicle-to-vehicle information, etc.) transmitted from an external device, and displays it to the information service unit 59 provided in the vehicle. The information service unit 59 may also be referred to as an output unit for outputting information (for example, outputting information to a display, a speaker, etc. based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0530] In addition, the communication module 60 stores various information received from the external device in the memory 62 that can be used by the microprocessor 61. The microprocessor 61 can also control the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the left and right front wheels 46, the left and right rear wheels 47, the axle 48, the various sensors 50-58, etc., which are provided in the vehicle 40 based on the information stored in the memory 62.

[0531] In addition, the base station in the present disclosure may also be rewritten as a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is rewritten as communication between multiple user terminals (for example, it may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be set as a structure in which the user terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" may also be rewritten as terms corresponding to inter-terminal communication (for example, "sidelink"). For example, uplink channels, downlink channels, etc. may also be rewritten as sidelink channels.

[0532] Likewise, the user terminal in the present disclosure may be rewritten as a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0533] In the present disclosure, operations are assumed to be performed by a base station, and sometimes by its upper node depending on the situation. Obviously, in a network including one or more network nodes having a base station, various operations performed for communication with a terminal can be performed by a base station, one or more network nodes other than the base station (for example, Mobility Management Entity (MME)), Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0534] The various methods / implementations described in this disclosure may be used individually or in combination, and may be used in a switched manner as the method is executed. In addition, the processing procedures, timings, flow charts, etc. of the various methods / implementations described in this disclosure may be swapped in order as long as they are not contradictory. For example, for the methods described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0535] The various modes / implementations described in the present disclosure may also be applied to 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 (x is, for example, an integer or a 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 (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems expanded, modified, created or specified based on them. In addition, multiple systems can also be applied in combination (for example, LTE or LTE-A, combination with 5G, etc.).

[0536] The phrase “based on” used in the present disclosure does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on”.

[0537] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not fully define the amount or order of these elements. These terms can be used in this disclosure as a convenient method to distinguish between two or more elements. Therefore, reference to the first and second elements does not mean that only two elements can be used or that the first element must take precedence over the second element in some form.

[0538] The term "determining" used in the present disclosure may include a variety of operations. For example, "determining" may also refer to situations where judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database or other data structure), ascertaining, etc. are considered to be "determining".

[0539] In addition, "judgment (decision)" may also be a situation where receiving (for example, receiving information), sending (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc. are regarded as making a "judgment (decision)".

[0540] In addition, "judgment (decision)" can also refer to situations where resolving, selecting, choosing, establishing, comparing, etc. are regarded as "judgment (decision)". That is, "judgment (decision)" can also refer to situations where some operations are regarded as "judgment (decision)".

[0541] In addition, "judge (decide)" can also be rewritten as "assuming (assuming)", "expecting (expecting)", "considering (considering)" and so on.

[0542] The "maximum transmit power" recorded in the present disclosure may refer to the maximum value of the transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0543] The terms "connected", "coupled", or all their variations used in this disclosure refer to all direct or indirect connections or combinations between two or more elements, and may include the situation where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be physical, logical, or a combination thereof. For example, "connection" may also be rewritten as "access".

[0544] In the present disclosure, when two elements are connected, it is possible to consider being "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc. as several non-limiting and non-inclusive examples.

[0545] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same manner as "different".

[0546] When the terms “include,” “including,” and variations thereof are used in the present disclosure, these terms have an inclusive meaning, similar to the term “comprising.” Furthermore, the term “or” used in the present disclosure does not have an exclusive OR meaning.

[0547] In the present disclosure, when an article is added by translation like a, an, and the in English, for example, the present disclosure may also include a case where the noun following the article is in plural form.

[0548] In the present disclosure, "below", "less than", "above", "more than", "equal to", etc. may also be rephrased with each other. Furthermore, in the present disclosure, words meaning "good", "bad", "big", "small", "high", "low", "early", "late", "wide", "narrow", etc. may also be rephrased with each other without being limited to the original degree, comparative degree and superlative degree. Furthermore, in the present disclosure, words meaning "good", "bad", "big", "small", "high", "low", "early", "late", "wide", "narrow", etc. may also be rephrased with each other as expressions with "ith (i is an arbitrary integer)" added thereto without being limited to the original degree, comparative degree and superlative degree (for example, "highest" may also be rephrased with "i-th highest").

[0549] In the present disclosure, “of,” “for,” “regarding,” “related to,” “associated with,” etc. may also be replaced by each other.

[0550] The invention involved in the present disclosure has been described in detail above, but it is obvious to those skilled in the art that the invention involved in the present disclosure is not limited to the embodiments described in the present disclosure. The invention involved in the present disclosure can be implemented as a modified and altered mode without departing from the gist and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of illustrative description and does not have any limiting meaning on the invention involved in the present disclosure.

Claims

1. A terminal having: A control unit determines any one of an operation of searching for SSBs of all SSB indexes in a plurality of synchronization signal block SSB groups and an operation of searching for SSBs of specific SSB indexes in the plurality of SSB groups, wherein the plurality of SSB groups are frequency-division multiplexed and one SSB group includes a plurality of SSBs that are time-division multiplexed; and The receiving unit detects one SSB within the plurality of SSB groups.

2. The terminal according to claim 1, in, The control unit determines the SSB that is frequency-division-multiplexed for the detected one SSB based on the frequency offset of the SSB.

3. The terminal according to claim 1, in, The control unit searches for at least one of the plurality of SSBs in the plurality of SSB groups using a plurality of synchronization grids.

4. The terminal according to claim 1, in, The control unit searches for at least one of the plurality of SSBs in the plurality of SSB groups using a plurality of synchronization grids, The plurality of synchronization grids are at least partially repeated in the frequency domain.

5. A wireless communication method, which is a wireless communication method of a terminal, comprising: A step of determining any one of an operation of searching for SSBs of all SSB indexes in a plurality of synchronization signal block SSB groups and an operation of searching for SSBs of specific SSB indexes in the plurality of SSB groups, wherein the plurality of SSB groups are frequency-division multiplexed and one SSB group includes a plurality of SSBs that are time-division multiplexed; and The step of detecting 1 SSB within the plurality of SSB groups.

6. A base station, comprising: a control unit for instructing any one of an operation of searching for SSBs of all SSB indexes in a plurality of synchronization signal block SSB groups and an operation of searching for SSBs of specific SSB indexes in the plurality of SSB groups, wherein the plurality of SSB groups are frequency-division multiplexed, and one SSB group includes a plurality of SSBs that are time-division multiplexed; and A sending unit sends the SSBs within the multiple SSB groups.

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