Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure is provided with: a reception unit that receives one SSB from among a plurality of SSBs in a plurality of SSB groups, the plurality of SSB groups being frequency-division multiplexed, the one SSB group including the plurality of SSBs being time-division multiplexed; and 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 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 a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been standardized for the purpose of further high-speed data rates, low latency, etc. (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) has been standardized for the purpose of further large capacity and high performance of LTE (Third Generation Partnership Project (3GPP (registered trademark)) Release (Rel.) 8, 9).

[0003] Research is also being conducted on subsequent systems of LTE (for example, also referred to as the 5th generation mobile communication system (5G), 5G + (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later, etc.).

[0004] Prior Art Documents

[0005] Non-Patent Documents

[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 (for example, NR), improvement of coverage is being studied.

[0009] However, if the beam is narrowed / multiplied for coverage improvement, there are concerns about increased overhead and reduced communication throughput.

[0010] Therefore, one object of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can improve the coverage range while considering the overhead.

[0011] Means for Solving the Problem

[0012] A terminal according to one embodiment of the present disclosure includes: a receiving unit that receives one SSB among a plurality of SSBs within a plurality of SSB groups, the plurality of SSB groups being frequency-division multiplexed, and one SSB group including a plurality of SSBs that are time-division multiplexed; and a control unit that determines one PRACH resource corresponding to the one SSB from among a plurality of physical random access channel (PRACH) resources corresponding to the plurality of synchronization signals within the plurality of SSB groups.

[0013] Advantageous Effects of the Invention

[0014] According to one embodiment of the present disclosure, it is possible to improve the coverage range while considering the overhead. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1A And Figure 1B is a diagram showing an example of a beam and a coverage range.

[0016] Figure 2 is a diagram showing an example of an SSB related to Option 1.

[0017] Figure 3A And Figure 3B is a diagram showing an example of an SSB related to Option 2.

[0018] Figure 4A And Figure 4B is a diagram showing an example of a measurement object based on Operations B and A.

[0019] Figure 5A And Figure 5B is a diagram showing an example of reception based on Operations B and A.

[0020] Figure 6A And Figure 6B is a diagram showing an example of reception of a set SSB.

[0021] Figure 7A And Figure 7B is a diagram showing an example of scheduling restrictions on other DL signals when all / part of the set SSB is received.

[0022] Figure 8A And Figure 8BIt is a diagram showing another example of reception of the set SSB.

[0023] Figure 9 It is a diagram showing an example of a beam within a cell.

[0024] Figure 10 It is a diagram showing an example of Selection Method 1.

[0025] Figure 11A And Figure 11B It is a diagram showing an example of Selection Method 2.

[0026] Figure 12A And Figure 12B It is a diagram showing another example of Selection Method 2.

[0027] Figure 13 It is a diagram showing an example of the SSB detection method related to Embodiment 1-1.

[0028] Figure 14 It is a diagram showing an example of the SSB detection method related to Option 1-1-2.

[0029] Figure 15 It is a diagram showing an example of the SSB detection method related to Embodiment 1-2.

[0030] Figure 16 It is a diagram showing another example of the SSB detection method related to Embodiment 1-2.

[0031] Figure 17A And Figure 17B It is a diagram showing an example of the SSB detection method related to Embodiment 1-2-1.

[0032] Figure 18A And Figure 18B It is a diagram showing an example of the time / frequency mapping of the SSB related to Embodiment 1-3-1 and Embodiment 1-3-2, respectively.

[0033] Figure 19A And Figure 19B It is a diagram showing an example of the mapping of the SSB related to Embodiment 1-4.

[0034] Figure 20 It is a diagram showing an example of the PRACH resource / preamble related to the second embodiment.

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

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

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

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

[0039] Figure 25 This is a diagram showing an example of the structure of a user terminal according to an embodiment.

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

[0041] Figure 27 This is a diagram showing an example of a vehicle according to an embodiment. Detailed Embodiments

[0042] (TCI, Spatial Relationship, QCL)

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

[0044] The TCI state may also represent the TCI state of a signal / channel applied to the downlink. What corresponds to the TCI state of a signal / channel applied to the uplink may also be referred to as a spatial relation.

[0045] The so-called TCI state is information related to the Quasi-Co-Location (QCL) of a signal / channel, and may also be referred to as a spatial reception parameter, Spatial Relation Information, etc. The TCI state may also be set for a UE for each channel or for each signal.

[0046] QCL is an indicator that indicates 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 (e.g., spatial Rx parameter) is the same among these different 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, namely types AD, may also be set. In the four QCL types AD, parameters (or parameter sets) that can be assumed to be the same are different, and the parameters (which may also be 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 in which the UE assumes that a certain Control Resource Set (CORESET), channel or reference signal is in a specific QCL (e.g., QCL type D) relationship with other CORESETs, channels or reference signals may also be referred to as 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 state or QCL assumption of the signal / channel.

[0055] The TCI state can also be, for example, information related to the quasi-co-location (QCL) between the channel that is the object (in other words, the reference signal (RS) used for this channel) and other signals (e.g., other RSs). The TCI state can also be set (indicated) by higher layer signaling, physical layer signaling, or a combination thereof.

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

[0057] The channel for which the TCI state or spatial relation is set (specified) can also be 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] Furthermore, the RS that has a QCL relationship with this channel can also be at least one of a synchronization signal block (Synchronization Signal Block (SSB)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a sounding reference signal (Sounding Reference Signal (SRS)), a CSI-RS for tracking (also referred to as a tracking reference signal (Tracking Reference Signal (TRS))), and a reference signal for QCL detection (also referred to as QRS).

[0059] An SSB is a signal block that contains 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)). An SSB can also be referred to as an SS / PBCH block.

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

[0061] (Initial access procedure)

[0062] In the initial access procedure, the UE (RRC_IDLE mode) performs reception of SS / PBCH blocks (SSB), 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). After that, if an ACK for Msg.4 is sent from the UE to the base station (network), the RRC connection is established (RRC_CONNECTED mode).

[0063] The reception of SSB includes PSS detection, SSS detection, PBCH-DMRS detection, and PBCH reception. In PSS detection, detection of a part of the physical cell ID (PCI), detection of OFDM symbol timing (synchronization), and (coarse) frequency synchronization are performed. SSS detection includes detection of the physical cell ID. PBCH-DMRS detection includes detection of a part of the SSB index within a semi-wireless frame (5 ms). PBCH reception includes detection of the system frame number (SFN) and wireless frame timing (SSB index), reception of setting information for receiving the remaining minimum system information (RMSI, SIB1), and identification of whether the UE can camp on this cell (carrier).

[0064] SSB has a bandwidth of 20 RBs and a time of 4 symbols. 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 transmitted within a period of 80 ms. N depends on the SSB transmission period.

[0066] System information includes the MIB carried by the PBCH, the RMSI (SIB1), and other system information (OSI). SIB1 includes the RACH setting and information for performing the RACH procedure. The time / frequency resource relationship between the SSB and the PDCCH monitoring resource for SIB1 is set by the PBCH.

[0067] The base station using beam correspondence transmits multiple SSBs respectively using multiple beams for each SSB transmission period. Each of the multiple SSBs has multiple SSB indexes. The UE that detects an SSB transmits a PRACH in the RACH occasion associated with the SSB index and receives an RAR in the RAR window.

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

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

[0070] The wider the frequency interval of the synchronization raster (the fewer the number of synchronization rasters), the shorter the time spent in the search during initial access, and the lower the load.

[0071] The candidates for the frequency positions where component carriers (CCs) are configured are called channel rasters.

[0072] The interval of the synchronization raster is determined to satisfy a specific condition. Specifically, the interval of the synchronization raster is determined so that for any channel raster in which a CC is configured with the minimum channel bandwidth (CBW), there is at least one synchronization raster such that the band of the SSB within the synchronization raster is included in the CBW.

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

[0074] Regarding the search target frequencies for the PSS / SSS other than at the time of initial access, it is indicated to the UE from the network (NW, e.g., the base station).

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

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

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

[0078] (Beam and Coverage)

[0079] In a high frequency band, if beamforming is not applied to the synchronization signal / reference signal, the coverage range becomes narrow and it is difficult for the UE to detect the base station. On the other hand, in order to ensure the coverage range, if beamforming is applied to the synchronization signal / reference signal, a strong signal will arrive in a specific direction, but it is more difficult for the signal to arrive in other directions ( Figure 1A ). In the base station before connecting the UE, if it is assumed that the direction where the UE is located is not clear, the synchronization signal / reference signal cannot be transmitted only using the beam in an appropriate direction. Consider a method in which the base station transmits multiple synchronization signals / reference signals having different directions respectively, and the UE identifies which beam has been detected. If a thin (narrow) beam is used for the coverage range, a large number of synchronization signals / reference signals need to be transmitted, so there is a concern about an increase in overhead and a decrease in frequency utilization efficiency.

[0080] If a thick (wide) beam is used to reduce the number of beams (synchronization signals / reference signals) and suppress the overhead, the coverage range becomes narrow ( Figure 1B )

[0081] In future wireless communication systems (e.g., 6G), further development of the utilization of frequency bands such as millimeter waves and terahertz waves is considered. Consider using multiple thin beams to construct the area / coverage range of a cell, thereby providing a communication service.

[0082] Consider using the existing FR2 to expand the area and using a frequency band higher than the existing FR2. To achieve these, it is preferable to improve beam management in addition to multi-TRP, reconfigurable intelligent surface (RIS), etc.

[0083] In the current 5G NR, the maximum number of Synchronization Signal Blocks (SSBs) is 64. Since up to 64 beams are required to cover the cell area (surface), it is difficult to use narrow beams. To use multiple narrow beams, consider the following beam management methods 1 and 2.

[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 up to 64 SSBs (the maximum number of SSBs is 64). Reduce the area (surface) covered by one cell / sector. There is a concern that cell / sector interference and high-speed / frequent handovers between cells / sectors will become problems.

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

[0089] [Option 1]

[0090] Use Time Division Multiplexing (TDM) to transmit more than 64 SSBs.

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

[0092] As Figure 2 shown, in Option 1, an SSB period longer than the SSB period of 64 SSBs in the existing specification is required, and it is considered that the delay increases in initial access.

[0093] [Option 2]

[0094] Use Time Division Multiplexing (TDM) and Frequency Division Multiplexing (FDM) to transmit more than 64 SSBs.

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

[0096] In Figure 3A and Figure 3BIn the example shown, 64 SSBs (SSB #0 to SSB #63, SSB #64 to SSB #127, SSB #128 to SSB #191) form a set, and three sets are FDM.

[0097] In Option 2, the SSB period for the UE varies according to 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. Therefore, (at most) 64 SSBs are received in each set that is FDM, so an SSB period longer than that of the 64 SSBs in the existing specification is required, and it is considered that the delay increases 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. Therefore, more than 64 (192 in Figure 3B ) SSBs are received in each set that is FDM, so reception can be performed with the same period as that of the 64 SSBs in the existing specification (refer to Figure 3B ).

[0102] In this way, in future wireless communication systems, research is being conducted on using a larger number of SSBs than specified in the existing specification. However, in such cases, research on methods for receiving / searching for SSBs, implementation of UEs, methods for random access procedures, etc. is insufficient. In the case of such insufficient research, there are concerns about increased overhead and reduced communication throughput.

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

[0104] Hereinafter, embodiments related to the present disclosure will be described in detail with reference to the drawings. The wireless communication methods related to the respective embodiments can be applied separately or in combination.

[0105] In the present disclosure, “A / B” and “at least one of A and B” can also be rewritten with each other. In addition, in the present disclosure, “A / B / C” can also mean “at least one of A, B, and C”.

[0106] In the present disclosure, terms such as activate, deactivate, indicate (or specify), select, configure, update, determine, etc. may also be rewritten with each other. In the present disclosure, terms such as support, control, be capable of controlling, operate, be capable of operating, etc. may also be rewritten with each other.

[0107] In the present disclosure, terms such as Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, Information Element (IE), configure, etc. may also be rewritten with each other. In the present disclosure, terms such as Medium Access Control control element (MAC control element (MAC Control Element (CE))), update command, activate / deactivate command, etc. may also be rewritten with each other.

[0108] In the present disclosure, higher layer signaling may also be any one of, for example, 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 (PDU), etc. Broadcast information may also be, for example, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI).

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

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

[0112] In the present disclosure, a panel, a receiving panel, a receiving chain, a UE panel, a panel group, an antenna group, a UE capability value (UE Capability value), a UE capability value set, a beam, a beam group, a precoder, an uplink (Uplink (UL)) transmission entity, a transmission / reception point (Transmission / Reception Point (TRP)), a base station, spatial relation information (Spatial Relation Information (SRI)), a spatial relation, an SRS resource indicator (SRS Resource Indicator (SRI)), a control resource set (COntrol REsource SET (CORESET)), a physical downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a codeword (Codeword (CW)), a transport block (Transport Block (TB)), a reference signal (Reference Signal (RS)), an antenna port (e.g., a demodulation reference signal (DeModulation Reference Signal (DMRS)) port), an antenna port group (e.g., a DMRS port group), a group (e.g., a spatial relation group, a code division multiplexing (Code Division Multiplexing (CDM)) group, a reference signal group, a CORESET group, a physical uplink control channel (Physical Uplink Control Channel (PUCCH)) group, a PUCCH resource group), a resource (e.g., a reference signal resource, an SRS resource), a resource set (e.g., a reference signal resource set), a CORESET pool, a transmission configuration indication state (TCI state) of the downlink (DL TCI state), a TCI state of the uplink (UL TCI state), a unified TCI state, a common TCI state, a quasi-co-location (Quasi-Co-Location (QCL)), a QCL assumption, etc. may also be rewritten with each other.

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

[0114] (Wireless communication method)

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

[0116] In each embodiment of the present disclosure, the SSB is mainly used as an example for illustration, but the reference signal / consent signal is not limited to the 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, the period, time domain, frame, subframe, time slot, sub-time slot, and symbol can also be rewritten with each other.

[0118] In each embodiment, the group, set (collection (set)), SSB to be measured, specific SSB, and specific reference signal (RS) can also be rewritten with each other.

[0119] In each embodiment, the number of SSBs can also be different from the number of existing SSBs, can be more than the number of existing SSBs, or can be more than 64.

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

[0121] Each embodiment of the present disclosure can be applied to both the licensed band (licensed spectrum) and the unlicensed band (shared spectrum).

[0122] Each embodiment of the present disclosure can also be applied by being limited to the reception operation of the reference signal / synchronization signal other than at the time of initial access. By "other than at the time of initial access", for example, it can also be the case where the RSRP / RSRQ / SINR measurement of the neighboring cell is indicated, the case where the additional service cell is indicated, the case at the time of handover, or at least one of the cases in the idle mode.

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

[0124] In the present disclosure, receive, measure, detect, explore (search), and monitor can also be rewritten with each other. In the present disclosure, receive (or transmit), perform a receive (or transmit) operation, and control receive (or transmit) can also be rewritten with each other.

[0125] <Zero-th Embodiment>

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

[0127] A UE may also be set with multiple beams (for receiving the SSB). The UE may also receive / measure / detect all of the set multiple beams (SSBs). In addition, the UE may also receive / measure / detect a part of the set multiple beams (SSBs).

[0128] It is also possible to switch the operation A of receiving / measuring / detecting all of the set SSBs ( Figure 4B ) and the operation B of receiving / measuring / detecting a specific (part) of the SSBs within the set SSBs ( Figure 4A ). The UE may also determine either operation A or operation B. The base station may also indicate / set either operation A or operation B.

[0129] By switching from operation A to operation B, it is possible to avoid unnecessary reception / measurement / detection of the SSB, and it is possible to reduce the time / delay taken for the reception / measurement / detection of the SSB. By not performing the reception / measurement / detection of the SSB during a part of the period, it is possible to avoid scheduling restrictions and increase the throughput.

[0130] In Figure 5A and Figure 5B 's example, groups #0 to #2 are transmitted. Groups #0 to #2 each contain SSBs #0 to #63. Figure 5A An example of operation B is shown. The UE selects group #1 as the measurement object from the set groups #0 to #2, and performs reception / measurement / detection only of group #1. As a result, it is possible to complete the reception / measurement / detection of all the SSBs #0 to #63 of the measurement object within only one of periods #1 to #3, and it is possible to suppress the delay of the measurement. Figure 5B An example of operation A is shown. The UE can complete the reception / measurement / detection of all the SSBs within the set groups #0 to #2 during periods #1 to #3 by performing the reception / measurement / detection of all the SSBs of the set groups #0 to #2.

[0131] In the above option 1, the UE may also receive / measure / detect / search all of the set SSBs (see Figure 6A).

[0132] The UE may also be, for example, a UE having one receiving panel or a UE using one receiving panel.

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

[0134] In the above Option 1, the UE may also receive / measure / detect / search a part (specific SSB) of the set SSB (see Figure 6B ).

[0135] The UE may also be, for example, a UE having one receiving panel or a UE using one receiving panel.

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

[0137] In Figure 6B In the case of the situation shown, it is possible to set so as not to perform measurements other than the measurement object, and power consumption can be reduced.

[0138] In Option 1, the UE may also decide on either the operation of receiving / measuring / detecting / searching all of the set SSBs (Operation A) or the operation of receiving / measuring / detecting / searching a part of the set SSBs (Operation B). In Option 1, the UE may also switch between the operation of receiving / measuring / detecting / searching all of the set SSBs (Operation A) and the operation of receiving / measuring / detecting / searching a part of the set SSBs (Operation B).

[0139] In addition, in the existing specifications, in a specific frequency range (for example, FR2), other DL signals of QCL type D different from the SSB cannot be received in the SSB symbol (scheduling restriction is required for other DL signals). Therefore, in the case of the situation shown in Figure 6B , since the SSB symbol can be reduced, the reception opportunity for other DL signals of QCL type D different from the SSB can be increased.

[0140] Figure 7A FIG. is an example showing the scheduling restriction of other DL signals when receiving all of the set SSBs. Figure 7A Corresponding to the above Figure 6A .

[0141] In Figure 7A the example shown, for a UE, in the same time domain as SSB#65, a DL signal (e.g., PDSCH) that has a QCL type D relationship with SSB#65 can be scheduled. On the other hand, for a UE, in a time domain different from SSB#65 (the same time domain as an SSB other than SSB#65), a DL signal (e.g., PDSCH) that has a QCL type D relationship with SSB#65 is not scheduled.

[0142] Figure 7B is a diagram showing an example of scheduling restrictions for other DL signals when a part of the set SSB is received. Figure 7B Corresponding to the above Figure 6B .

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

[0144] In addition, in the present disclosure, the case where the number of simultaneously receivable DL signals of different QCL type D is 1 is shown, but this number is not limited thereto. This number can be 2 or more, can be predefined in the specification, can be a value reported through UE capability information, or can be set / notified to the UE through higher layer signaling.

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

[0146] This UE can be, for example, a UE having one receiving panel or a UE using one receiving panel (UE#1 in Figure 8A ). This UE can be, for example, a UE having multiple receiving panels or a UE using multiple receiving panels (UE#2 in Figure 8A ).

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

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

[0149] For example, the UE can also be a UE with one receiving panel or a UE using one receiving panel (UE#1 in Figure 8B ). For example, the UE can also be a UE with multiple receiving panels or a UE using multiple receiving panels (UE#2 in Figure 8B ).

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

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

[0152] In Figure 8B the case of the situation shown, it is possible to perform settings so as not to perform measurements other than the measurement target, and it is possible to reduce power consumption.

[0153] In Option 2, the UE can also decide on either the operation of receiving / measuring / detecting / searching for all of the configured SSB (Operation A) or the operation of receiving / measuring / detecting / searching for a part of the configured SSB (Operation B). In Option 2, the UE can also switch between the operation of receiving / measuring / detecting / searching for all of the configured SSB (Operation A) and the operation of receiving / measuring / detecting / searching for a part of the configured SSB (Operation B).

[0154] <First Embodiment>

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

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

[0157] At initial access, it is also possible to configure the PRACH resources / preambles corresponding to the SSB. The number of configured / transmitted SSBs and the number of PRACH resources / preambles can also be equal.

[0158] At initial access, the number of receiving windows for random access response (RAR) can also be less than the number of SSBs configured / transmitted. One receiving window for RAR can also correspond to multiple PRACH resources / preambles.

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

[0160] The UE can also perform beam measurement / reporting using a part of the SSBs (SSB subset) based on the indicated TCI state.

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

[0162] The UE can also determine candidate beams in beam failure recovery based on the indicated TCI state or the TCI state of PDCCH. For example, the UE can also use a part of the SSBs (SSB subset) to determine the candidate beams. If no new beam with a quality exceeding a specific level can be detected in the SSB subset, the UE can also change (switch) the SSB subset to search for / determine candidate beams.

[0163] The update (switch) of the SSB subset to be measured can also be performed using higher layer signaling (RRC / MAC CE) / DCI.

[0164] For example, the update (switch) of the SSB subset to be measured can also be performed in association with / based on the indicated TCI state of the unified TCI state defined in Rel.17.

[0165] The method for determining the above SSB subset is described below.

[0166] In Rel.15, the UE measures all the configured / specified SSBs and reports / uses the beam with the best measurement result. When transmitting on the random access channel (RACH), the UE transmits the PRACH at the physical random access channel (PRACH) occasion corresponding to the SSB with the highest received power. In the layer 1 (L1) beam report after RRC connection establishment, the UE reports 1 / 2 / 4 SSB resource indicators (SSBRIs) / CSI-RS resource indicators (CRIs) with the highest L1-reference signal received power (RSRP) / L1-signal-to-interference and noise ratio (SINR) and the values of L1-RSRP / L1-SINR from the configured SSBs / CSI-RSs to the base station.

[0167] If the number of beams increases, the exploration of all beams takes time and the efficiency decreases. When switching beams, it is assumed that the UE switches from the currently used beam to the surrounding beams, so the UE does not have to explore all beams. For example, in Figure 9 the example of, it is conceivable to switch from the beam of the in-use SSB #9 among SSBs #0 to #16 within the coverage area of the TRP (cell) #1 to any one of the surrounding SSBs #4, #5, #6, #8, #10, #13, #14, #15.

[0168] The UE can also select specific (measurement target) SSBs from all the (configured / specified) SSBs and perform reception / measurement / detection of the specific SSBs.

[0169] The occasion for reception / measurement / detection of the SSB can also be at least one or all of the measurement / reporting of L1-RSRP / L1-SINR / L3-RSRP / L3-SINR, the determination of the PRACH occasion for PRACH transmission, the determination of the new beam RS in the BFR, and the measurement for event-based beam reporting. The UE can also report the upper X indices of the measurement results in the SSB indices of the measurement target to the base station.

[0170] The index of the current (in-use) SSB can be either the TCI state / spatial relation set for the current PDCCH / PDSCH / PUCCH / PUSCH / SRS / CSI-RS, or the TCI state set for the PDCCH, or the DL TCI state or joint TCI state set for the unified TCI state (common TCI state), or the index of the SSB / CSI-RS corresponding to the index of the best beam reported through L1-RSRP / L1-SINR beam reporting (SSBRI / CRI).

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

[0172] 〔Selection Method 1〕

[0173] It is also possible to notify / set the correspondence relationship (association, the relationship of state transition from the index of the current SSB to the index of the SSB to be measured) between the index of the current SSB and the index of the SSB to be measured. In Figure 10 the example of, regarding the correspondence relationship, it is also possible to show the association to the index of one or more SSBs to be measured for each index of the current SSB.

[0174] When determining whether to perform beam switching, the UE can also determine whether the measurement result of the SSB to be measured is better or worse than the measurement result of the current SSB. Even when the index of the SSB to be measured is not explicitly notified, the index of the SSB to be measured can include the index of the current SSB. However, when determining the new beam RS in BFR, since the index of the current SSB corresponds to a beam with failure, it may not be included in the index of the SSB to be measured.

[0175] 〔Selection Method 2〕

[0176] The UE can also follow rules to determine the index (indices of multiple SSBs) of the SSB to be measured (specific) from the index of the current SSB. The rules can 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 can be either the indices of all SSBs within the group including the index of the current SSB, or the indices of the SSBs in the group excluding the index of the current SSB. In Figure 11AIn the example, the current SSB #1 is included in group #1. The UE can also select SSB #0 to SSB #63 within the same group #1 as the current SSB as measurement objects.

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

[0180] The number of SSBs of the measurement objects may not be limited to less than a specific number of SSBs within a period / cycle. In this case, the UE can either receive one SSB in the same symbol and receive / measure / detect all the SSBs of the measurement objects over multiple periods / cycles, or use multiple panels to receive multiple SSBs in the same symbol and receive / measure / detect all the SSBs of the measurement objects within a period / cycle.

[0181] [[Rule 2]]

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

[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 either the indices of N + 1 SSBs from the index m - floor(N / 2) of the SSB to the index m + ceil(N / 2) of the SSB (centered on the current index m of the SSB), or the indices of N SSBs among the indices of N + 1 SSBs from the index m - floor(N / 2) of the SSB to the index m + ceil(N / 2) of the SSB (centered on the current index m of the SSB) excluding the current index m of the SSB. In addition, floor / ceil / round can be used instead of floor / ceil. When the current index of the SSB is set at a distance D from m, the index of the SSB of the measurement object can be either the indices of 2D + 1 SSBs from the index m - D of the SSB to the index m + D of the SSB (centered on the current index m of the SSB), or the indices of 2D SSBs among the indices of 2D + 1 SSBs from the index m - D of the SSB to the index m + D of the SSB (centered on the current index m of the SSB) excluding the current index m of the SSB. The index of the SSB of the measurement object can also be the index at a specific interval (e.g., 2) (centered on the current index m of the SSB).

[0184] To avoid the index p of the SSB obtained from the calculation formula exceeding the number Q of SSB indices or becoming negative, the index of the SSB of the measurement object can also be provided by mod(p,Q).

[0185] The SSB group may not be used. In the Figure 11B example, SSB#0 to #191 are transmitted, the current SSB is SSB#65, and when the number N of SSBs of the measurement object is 5, the SSBs of the measurement object can also be SSB#63 to #67.

[0186] The index of the SSB of the measurement object can also be non - consecutive. For example, the index of the SSB of the measurement object can be every other one.

[0187] [[Rule 3]]

[0188] The SSB of the measurement object can also be the SSB adjacent on the time axis and adjacent to the current SSB on the frequency axis (the surrounding / adjacent SSBs of the current SSB in the time / frequency plane). In the Figure 12A example, transmission groups #0 to #2 are sent, and groups #0 to #2 each contain SSBs #0 to #63. The current SSB is SSB#1 in group #1, and the SSBs of the measurement object include SSBs #0 to #2 in group #0, SSBs #0 to #2 in group #1, and SSBs #0 to #2 in 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 can either receive one SSB in the same symbol and receive / measure / detect all the SSBs of the measurement object over multiple periods / cycles, or use multiple panels to receive multiple SSBs in the same symbol and receive / measure / detect all the SSBs of the measurement object in one period / cycle.

[0190] [[Rule 4]]

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

[0192] Embodiment 1-1

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

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

[0195] After detecting this SSB (which can also be referred to as the detected SSB), the UE can also determine the resources of other SSBs. The SSB can 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 can also determine / determine / judge the FDM SSB based on a specific method.

[0198] For example, the UE can also determine / determine / judge the detected SSB and other FDM SSBs based on the offset with respect to the detected SSB.

[0199] This frequency offset can be specified in the specification in advance, can be broadcast through the system information block (SIB) / physical broadcast channel (PBCH), or can also be set using high-layer signaling.

[0200] The frequency offset can also be specified / set for each subcarrier spacing (SCS) / bandwidth / frequency range, or can be common for multiple SCS / bandwidth / frequency ranges.

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

[0202] The mapping of time / frequency for the SSB can also be specified (e.g., it can also be called the two-dimensional mapping of time / frequency of the SSB). For example, when the maximum number of SSBs in the time direction is M, the SSB index of the SSBs separated by FDM can also increase by M each time.

[0203] For example, when the SSB index of the SSB detected by the UE is 64 and the maximum number of SSBs in the time direction is 64, the UE can also determine that: if the amount corresponding to the frequency offset is shifted in the negative direction of the frequency direction, there is an SSB resource with an SSB index of 0, and if the amount corresponding to 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 can be either specified in the specification in advance, broadcast by SIB / PBCH, or set using higher layer signaling.

[0205] Figure 13 FIG. is an example showing a method for detecting an SSB according to Embodiment 1-1. In Figure 13 In the example shown, the UE searches the synchronization raster and detects the SSB. Then, based on the frequency offset specified / set in advance, the UE determines the detected SSB and other SSBs (resources) separated by FDM.

[0206] Hereinafter, the number of SSBs during the detection of the SSB by the UE will be described.

[0207] The UE may not assume / expect to detect multiple SSBs within one synchronization raster (Option 1-1-1). Thereby, the processing load of the UE can be reduced.

[0208] In Option 1-1-1, the frequency offset of the SSB can also be larger (wider) than the width of the synchronization raster. In this case, within one synchronization raster, multiple SSBs separated by FDM are not detected.

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

[0210] The UE can also assume / expect to detect multiple SSBs within one synchronization raster (Option 1-1-2). As Figure 14 shown, the frequency offset can also be specified / set such that multiple SSBs are included within the synchronization raster.

[0211] The UE can also be set to perform initial access by detecting a specific (e.g., the one with the highest received power / quality (e.g., RSRP / RSRQ / SINR)) SSB among the multiple detected SSBs.

[0212] Embodiment 1-2

[0213] The UE in Embodiment 1-2 can also be, for example, a UE with multiple receiving panels or a UE using multiple receiving panels.

[0214] The UE can receive synchronization signals (SSB (PSS / SSS)). The UE can receive synchronization signals in the synchronization raster.

[0215] The UE can also use multiple synchronization rasters simultaneously to search for synchronization signals. Thereby, the detection time of the synchronization signals of the UE can be reduced.

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

[0217] The UE can also search for synchronization signals by changing the receiving beam individually (independently) for each synchronization raster.

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

[0219] After the detection of this SSB (which can also be referred to as the detected SSB), the UE can determine the resources of other SSBs. The SSBs can also be TDM / FDM.

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

[0221] The UE can also determine / judge / detect 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] Figure 15 FIG. is an example showing a method for detecting an SSB related to Embodiment 1-2. In Figure 15 the example shown, the UE searches for and detects SSBs in multiple synchronization grids (a first synchronization grid and a second synchronization grid). 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, there is a concern that the load of searching for synchronization signals increases due to the widened bandwidth of the SSB compared with the existing specifications. Even when detecting an SSB subjected to FDM, it is desirable to detect the SSB with as narrow a bandwidth as possible. Hereinafter, a solution to this problem will be described.

[0224] One synchronization grid may also contain multiple (FDM'd) SSBs. The UE may also assume / expect that one synchronization grid contains multiple (FDM'd) SSBs.

[0225] Multiple synchronization grids may also overlap in the frequency domain. Multiple synchronization grids may completely overlap in the frequency domain or may partially overlap.

[0226] According to this method, the frequency band measured during SSB detection can be narrowed, and the power efficiency of the UE can be improved. In addition, the UE may be a UE capable of performing multiple beam scans simultaneously.

[0227] Figure 16 FIG. is another example showing a method for detecting an SSB related to Embodiment 1-2. In Figure 16 the example shown, the UE searches for and detects SSBs in multiple synchronization grids (a first synchronization grid and a second synchronization grid). In Figure 16 the example shown, the first synchronization grid and the second synchronization grid partially overlap 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 synchronization signals" in Embodiment 1-2 can also be interpreted as the "load / memory capacity for searching for synchronization grids in an SSB period (e.g., 20 ms)".

[0231] The following description related to "memory" in this embodiment is merely an example. In the present disclosure, memory, UE capabilities, and specific functions / capabilities may also be rewritten with each other.

[0232] Regarding the cases related to the implementation of the UE, consider the following Cases 1 to 3.

[0233] [[Case 1]]

[0234] The UE may also search for SSBs with the number of SSBs FDM'ed being 1 (i.e., no SSBs are FDM'ed) at a specific SSB period (e.g., 20 ms).

[0235] In Case 1, in the UE, the implementation of the memory capacity required by the UE of the existing specification (e.g., Rel. 15) is needed.

[0236] [[Case 2]]

[0237] The UE may also search for SSBs with the number of SSBs FDM'ed being N at a specific SSB period (e.g., 20 ms) (see Figure 17A ).

[0238] The UE in Case 2 may also be, for example, the UE related to the above-described Embodiment 1-2.

[0239] In Case 2, in the UE, the implementation of the memory capacity (and N times the receiving panel) N times that required by the UE of the existing specification (e.g., Rel. 15) is needed.

[0240] In addition, in Case 2, as described above, the bandwidth of the synchronization raster may not be N times (multiple synchronization rasters may partially / fully overlap).

[0241] [[Case 3]]

[0242] The UE may also search for SSBs with the number of SSBs FDM'ed being N at a specific SSB period (e.g., N × 20 ms) (see Figure 17B ).

[0243] The UE in Case 3 may be, for example, either the UE related to the above-described Embodiment 1-1 or the UE related to the above-described Embodiment 1-2.

[0244] In Case 3, in the UE, the implementation of the memory capacity required by the UE of the existing specification (e.g., Rel. 15) is needed.

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

[0246] A UE having / supporting the first UE capability may also be conceived to generate SSB bursts at an existing period (e.g., 20 ms).

[0247] A UE having / supporting the first UE capability may also be, for example, a UE supporting the operations of the above-described Embodiment 1-1. A UE having / supporting the first UE capability may also be, for example, a UE supporting the operations of the above-described Embodiment 1-2 and having a larger (increased) memory capacity than the UE supporting the operations of the above-described Embodiment 1-1.

[0248] A UE having / supporting the first UE capability may also, at initial access, conceive of receiving an SSB with the number of SSBs FDM'd being 1 (i.e., the SSB is not FDM'd).

[0249] A UE having / supporting the second UE capability may also be conceived to generate SSB bursts at a period different from an existing period (e.g., N×20 ms, or 20 / N ms).

[0250] A UE having / supporting the second UE capability may also be, for example, a UE supporting the operations of the above-described Embodiment 1-1. A UE having / supporting the first UE capability may also be, for example, a UE supporting the operations of the above-described Embodiment 1-2 and having a larger (increased) memory capacity than the UE supporting the operations of the above-described Embodiment 1-1.

[0251] A UE having / supporting the second UE capability may also, at initial access, conceive of receiving an SSB with the number of SSBs FDM'd being N.

[0252] A UE supporting the operations of the above-described Embodiment 1-2 may also search for SSBs based on the implemented memory capacity. At this time, the SSB (burst) period may also be an existing SSB period (e.g., 20 ms).

[0253] A UE may also search for every Nth synchronization grid. For example, a UE supporting the operations of the above-described Embodiment 1-2 and having the same memory capacity as the UE supporting the above-described Embodiment 1-1 may also search for every Nth synchronization grid.

[0254] A UE may also search for all synchronization grids. For example, a UE supporting the operations of the above-described Embodiment 1-2 and having the same memory capacity as the UE supporting the above-described Embodiment 1-1 may also search for all synchronization grids.

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

[0256] In addition, in the present disclosure, each of the multiple synchronization grids can either overlap (completely overlap) with other synchronization grids in the frequency domain, or not overlap, or partially overlap. Regarding which one of overlapping / non-overlapping / partial overlapping of the synchronization grids is supported, it can be determined based on the reported UE capabilities, or can be predefined in the specification.

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

[0258] Furthermore, in the present disclosure, a UE having one reception panel, or a UE using one reception panel, can also attempt to detect one SSB at each specific period (e.g., 20 ms). In this case, the UE can also clear the memory when it fails to detect the SSB. The memory capacity of this UE can also be equal to the memory capacity 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 at each specific period (e.g., 20 ms). In this case, the UE can also detect / decide the SSB with the best reception power / quality (highly correlated) among the SSBs measured in the N×20 ms period. The memory capacity of this UE can also be equal to N times the memory 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 performed.

[0261] 《Embodiment 1-3》

[0262] In Embodiment 1-3, the mapping of time / frequency for the SSB (e.g., which can also be referred to as the two-dimensional mapping of time / frequency 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] When exceeding the maximum number of SSBs that can be TDM, the UE can also assume / expect that the SSBs are FDM.

[0266] The UE can 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) FDM (in the same time domain).

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

[0268] Figure 18A is a diagram showing an example of the time / frequency mapping of the SSB related to Embodiment 1-3-1. Regarding Figure 18A For the time / frequency mapping shown, SSB#0 to #63 (SSB group #0), SSB#64 to #127 (SSB group #1), and SSB#128 to #191 (SSB group #2) are respectively TDM, and SSB group #0, SSB#SSB group #1, and SSB group #2 are FDM.

[0269] In Figure 18A In the example shown, the UE determines the mapping of the SSB as shown based on the detected SSB (e.g., SSB#64) and the number of SSBs FDM (here it is 3). Figure 18A shown.

[0270] [Embodiment 1-3-2]

[0271] The SSB can be FDM regardless of whether the total number of SSBs exceeds the maximum number of SSBs that can be TDM.

[0272] The UE can also assume / expect that the SSB is FDM regardless of whether the total number of SSBs exceeds the maximum number of SSBs that can be TDM.

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

[0274] The information related to the maximum number of SSBs in the time direction (the number of SSBs in each SSB group) can be broadcast via SIB / PBCH or notified via higher layer signaling.

[0275] Figure 18B is a diagram showing an example of the time / frequency mapping of the SSB related to Embodiment 1-3-2. Regarding Figure 18BFor the time / frequency mapping shown, SSB #0 to #31 (SSB group #0), SSB #32 to #63 (SSB group #1), and SSB #64 to #95 (SSB group #2) are respectively TDM, and SSB group #0, SSB group #1, and SSB group #2 are FDM.

[0276] In Figure 18B the example shown, the UE determines the mapping of the SSB as shown based on the detected SSB (e.g., SSB #32), the number of SSBs that are FDM (here 3), and the maximum number of SSBs in the time direction (here 32). Figure 18B shown

[0277] According to Embodiment 1-3-2, compared with the above Embodiment 1-3-1, even if the number of SSBs is the same as the existing specification (64), it is possible to perform TDM / FDM on the SSBs (able to map the SSBs two-dimensionally in time / frequency), and it is possible to reduce the latency of initial access / beam scanning compared with the existing specification (e.g., Rel.15-17).

[0278] "Embodiment 1-4"

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

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

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

[0282] Thereby, it is possible to flexibly map the SSB in the time (frequency) resource.

[0283] Figure 19A is a diagram showing an example of the mapping of the SSB related to Embodiment 1-4. In Figure 19A 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 respectively mapped to the time domain individually.

[0284] The mapping in the time domain of the SSB can also be set / decided commonly for multiple (e.g., all) frequencies (SSB groups).

[0285] Thereby, it is possible to reduce the overhead of the signaling (e.g., SIB1) of the time position of the SSB.

[0286] Figure 19B This is a diagram showing another example of the mapping of the SSB related to Embodiments 1-4. In Figure 19B 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, the mapping related to the time domain is described, but the mapping for the frequency domain can also be applied in the same way. In other words, the "time domain" in this embodiment can also be rewritten as the "frequency domain".

[0288] Furthermore, an example where the SSB in the present disclosure is mapped to a continuous time domain (e.g., symbols) is shown, but these are just examples. The SSB in the present disclosure can be mapped to either a continuous time domain (e.g., symbols) or a discontinuous time domain (e.g., symbols).

[0289] "Embodiment 1-5"

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

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

[0292] Information related to the time domain / frequency domain mapping for SSB groups can also be, for example, at least one of a specific parameter indicating the time position of the SSB (e.g., ssb-PositionsInBurst) and information related to the frequency offset described in the above Embodiments 1-1 / 1-2.

[0293] Information related to the time domain / frequency domain mapping for SSB groups can also be broadcast via SIB / PBCH. For example, information related to the time domain / frequency domain mapping for SSB groups can be included in the serving cell configuration (e.g., ServingCellConfigCommonSIB) within SIB1.

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

[0295] [Embodiment 1-5-1]

[0296] The UE can also receive information related to the time-domain / frequency-domain mapping for its own SSB group via broadcast information (e.g., SIB1 / PBCH). In addition, the UE can also receive information related to the time-domain / frequency-domain mapping for other SSB groups via RRC signaling.

[0297] According to Embodiment 1-5-1, the UE does not need to know the existence of other SSB groups, so the payload (number of bits / size) of broadcast information (e.g., SIB1) can be reduced.

[0298] In addition, the UE can also receive information indicating the existence of other SSB groups (or information related to the total number of SSBs) via broadcast information (e.g., SIB1).

[0299] [Embodiment 1-5-2]

[0300] The UE can also receive information related to the time-domain / frequency-domain mapping for its own SSB group via broadcast information (e.g., SIB1 / PBCH). In addition, the UE can also receive information related to the time-domain / frequency-domain mapping for other SSB groups via broadcast information (e.g., SIB1 / PBCH).

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

[0302] According to the above first embodiment, it is possible to appropriately receive / measure / detect / search for SSBs that are TDM / FDM during initial access.

[0303] <Second Embodiment>

[0304] The second embodiment relates to the physical random access channel (PRACH).

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

[0306] The N (e.g., 64) SSBs configured for the UE can also be TDM (in the same frequency domain).

[0307] The M SSBs configured for the UE can also be FDM (in the same time domain).

[0308] It is also possible to configure / transmit N×M SSBs.

[0309] In this case, the PRACH resources / preambles can also be defined / configured as N×M.

[0310] The above Option 2 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 through multiple beams of QCL type D.

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

[0312] The SSB and the PRACH resources / preambles can also correspond. The correspondence between the SSB and the PRACH resources / preambles can also be defined / configured.

[0313] The UE can also select the PRACH resources / preambles corresponding to the detected SSB and transmit the PRACH.

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

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

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

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

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

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

[0320] <Third Embodiment>

[0321] The third embodiment relates to a random access response (RAR).

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

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

[0324] The number of resources (e.g., RAR window) for receiving the RAR can also be smaller than N×M. For example, the number of resources (e.g., RAR window) for receiving the RAR can also be N.

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

[0326] The UE can also use the reception spatial domain filter of the detected SSB (or, the same reception spatial domain filter as the transmission spatial domain filter of the transmitted PRACH) to receive the corresponding RAR.

[0327] The setting of the RAR window (e.g., ra-ResponseWindow included in SIB1) can also be set for each SSB. In addition, the setting of the RAR window (e.g., ra-ResponseWindow included in SIB1) can also be set for every multiple SSBs. The multiple SSBs can also be multiple SSBs FDM in the same time domain.

[0328] Figure 21 is a diagram showing an example of the RAR related to the third embodiment. In Figure 21 the example shown, the UE detects an SSB (SSB#65) and transmits a PRACH (PRACH#65) corresponding to the detected SSB. In Figure 21 the example shown, 64 SSBs / PRACHs are TDM.

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

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

[0331] Figure 22 It is a diagram showing another example of the RAR related to the third embodiment. In Figure 22 In the example shown, the UE detects the SSB (SSB#65) and transmits the PRACH (PRACH#65) corresponding to the detected SSB. In Figure 22 In the example shown, 64 SSBs / PRACHs are TDM.

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

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

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

[0335] <Supplement>

[0336] [Notification of Information to the UE]

[0337] Notification of any information from a network (Network (NW)) (e.g., a base station (Base Station (BS))) to a UE (in other words, reception of any information from the BS by the UE) can also be performed using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), specific signals / channels (e.g., PDCCH, PDSCH, reference signals), or a combination thereof.

[0338] In the case where the above notification is performed via a MAC CE, the MAC CE can also be identified by including a new logical channel ID (Logical Channel ID (LCID)) not specified in existing standards in the MAC subheader.

[0339] In the case where the above notification is performed via DCI, the above notification can also be performed via a specific field of the DCI, a radio network temporary identifier (Radio Network Temporary Identifier (RNTI)) used in the scrambling of cyclic redundancy check (Cyclic Redundancy Check (CRC)) bits assigned to the DCI, the format of the DCI, etc.

[0340] In addition, notification of any information to the UE in the above embodiments can also be performed periodically, semi - persistently, or aperiodically.

[0341] [Notification of information from the UE]

[0342] Notification of any information from a UE (to the NW) (in other words, transmission / reporting of any information from the UE to the BS) in the above embodiments can also be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MACCE), specific signals / channels (e.g., PUCCH, PUSCH, PRACH, reference signals), or a combination thereof.

[0343] In the case where the above notification is performed via a MAC CE, the MAC CE can also be identified by including a new LCID not specified in existing standards in the MAC subheader.

[0344] In the case where the above notification is performed via UCI, the above notification can also be sent using PUCCH or PUSCH.

[0345] In addition, notification of any information from the UE in the above embodiments can also be performed periodically, semi - persistently, or aperiodically.

[0346] [Regarding the application of each embodiment]

[0347] At least one of the above-described embodiments may also be applied under specific conditions. The specific conditions may be specified in a standard or may be notified to the UE / BS using higher layer signaling / physical layer signaling.

[0348] At least one of the above-described embodiments may also be applied only to a UE that has reported a specific 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 / operations / control / information for at least one of the above-described embodiments (e.g., reception of SSBs over 64, reception of SSBs that are TDM / FDM),

[0351] ・Support for transmission / reception using multiple receive / transmit panels,

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

[0353] In addition, the specific UE capability may be a capability that is applied across the entire frequency (commonly regardless of frequency), a capability for each frequency (e.g., one or a combination of a cell, a band, a band combination, a BWP, a component carrier, etc.), a capability for each frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), a capability for each subcarrier spacing (SubCarrier Spacing (SCS)), a capability for each feature set (Feature Set (FS)) or a feature set per component carrier (Feature Set PerComponent-carrier (FSPC)).

[0354] In addition, the specific UE capability may be a capability that is applied across all duplex modes (commonly regardless of the duplex mode) or a capability for each duplex mode (e.g., Time Division Duplex (TDD), Frequency Division Duplex (FDD)).

[0355] In addition, at least one of the above-described embodiments can also be applied when the UE is set / activated / trigged by higher-layer signaling / physical-layer signaling with specific information associated with the above-described embodiments (or when operating the above-described embodiments). For example, the specific information can also be information indicating activation of reception of SSBs exceeding 64, information indicating activation of reception of SSBs that are TDM / FDM, any RRC parameters for a specific version (e.g., Rel. 18 / 19), etc.

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

[0357] (Appendix A)

[0358] Regarding one embodiment of the present disclosure, the following inventions are noted.

[0359] [Appendix A-1]

[0360] The terminal has:

[0361] a control unit that determines either an operation of searching for SSBs with all SSB indices within a plurality of synchronized signal block (SSB) groups or an operation of searching for SSBs with a specific SSB index within the plurality of SSB groups, the plurality of SSB groups being frequency-division multiplexed, and one SSB group including a plurality of SSBs that are time-division multiplexed; and

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

[0363] [Appendix A-2]

[0364] The terminal according to Appendix A-1, wherein

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

[0366] [Appendix A-3]

[0367] The terminal according to Appendix A-1 or Appendix A-2, wherein

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

[0369] [Appendix A-4]

[0370] The terminal according to any one of Appendix A-1 to Appendix A-3, wherein

[0371] The control unit uses a plurality of synchronization grids to search for at least one of a plurality of SSBs within the plurality of SSB groups.

[0372] At least a part of the plurality of synchronization grids overlaps in the frequency domain.

[0373] (Appendix B)

[0374] Regarding an embodiment of the present disclosure, the following invention is appended.

[0375] [Appendix B-1]

[0376] The terminal has:

[0377] a receiving unit that receives one SSB among a plurality of SSBs within a plurality of SSB groups, the plurality of SSB groups being frequency-division multiplexed, and one SSB group including 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] The terminal according to Appendix B-1, wherein

[0381] 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] The terminal according to Appendix B-1 or Appendix B-2, wherein

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

[0385] [Appendix B-4]

[0386] The terminal according to any one of Appendix B-1 to Appendix B-3, wherein

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

[0388] (Wireless communication system)

[0389] Hereinafter, the structure of the 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 above-described wireless communication methods according to the respective embodiments of the present disclosure is used for communication.

[0390] Figure 23 FIG. 4 is an example showing a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 (which may also be simply referred to as the system 1) may be a system that realizes communication by using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the 5th generation mobile communication system New Radio (5G NR), or the like.

[0391] In addition, the wireless communication system 1 may support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple Radio Access Technologies (RATs). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0392] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the Master Node (MN), and the base station (gNB) of NR is the 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 may also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity where both the MN and the SN are base stations (gNBs) of NR (NR-NR Dual Connectivity (NN-DC))).

[0394] The wireless communication system 1 may also include a base station 11 that forms a macro cell C1 with a relatively wide coverage area, and a base station 12 (12a - 12c) that is disposed within 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 within at least one cell. The configuration, number, etc. of each cell and the user terminal 20 are not limited to the manner shown in the figure. Hereinafter, without distinguishing between the base stations 11 and 12, they are collectively referred to as the base station 10.

[0395] The user terminal 20 may also be connected to at least one of the plurality of base stations 10. The user terminal 20 may also utilize at least one of carrier aggregation (CA) and dual connectivity (DC) that uses multiple component carriers (CCs).

[0396] Each CC may also be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a 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 of 6 GHz or less (sub - 6 GHz), and FR2 may be a frequency band higher than 24 GHz (above - 24 GHz). Additionally, the frequency bands, definitions, etc. of FR1 and FR2 are not limited to these. For example, FR1 may correspond to a frequency band higher than FR2.

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

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

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

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

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

[0402] In the wireless communication system 1, a wireless access method based on Orthogonal Frequency Division Multiplexing (OFDM) can also be utilized. 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. can also be used.

[0403] The wireless access method can also be referred to as a waveform. Additionally, in the wireless communication system 1, in the wireless access methods of the UL and the DL, other wireless access methods (e.g., other single-carrier transmission methods, other multi-carrier transmission methods) can also be used.

[0404] In the wireless communication system 1, as the downlink channel, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. shared among the user terminals 20 can also be used.

[0405] Furthermore, in the wireless communication system 1, as the uplink channel, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. shared among the user terminals 20 can also be used.

[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, the Master Information Block (MIB) can also be transmitted through PBCH.

[0407] Low-layer control information can also be transmitted through PDCCH. The low-layer control information can also include, for example, downlink control information (Downlink Control Information (DCI)), and the downlink control information includes scheduling information for at least one of PDSCH and PUSCH.

[0408] In addition, the DCI for scheduling PDSCH can also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling PUSCH can also be referred to as UL grant, UL DCI, etc. In addition, PDSCH can also be rewritten as DL data, and PUSCH can 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 resource for searching DCI. The search space corresponds to the search area and search method for PDCCH candidates. One CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a certain search space based on the search space setting.

[0410] One search space can also correspond to PDCCH candidates equivalent to one or more aggregation levels. One or more search spaces can 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", etc. in the present disclosure can also be rewritten with each other.

[0411] Through the PUCCH, it is also possible to transmit uplink control information (Uplink Control Information (UCI)) including at least one of channel state information (Channel State Information (CSI)), delivery confirmation information (for example, it can also be referred to as Hybrid Automatic Repeat Request ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (Scheduling Request (SR)). Through the PRACH, it is also possible to transmit a random access preamble for establishing a connection with the cell.

[0412] In addition, in the present disclosure, the downlink, uplink, etc. can also be expressed without "link". Furthermore, it can also be expressed without "Physical" at the beginning of various channels.

[0413] In the wireless communication system 1, it is also possible to transmit a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. In the wireless communication system 1, as the DL-RS, it is also possible to transmit 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.

[0414] The synchronization signal can be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) can also be referred to as an SS / PBCH block, an SS block (SS Block (SSB)), etc. In addition, SS, SSB, etc. can also be referred to as reference signals.

[0415] In addition, in the wireless communication system 1, as the uplink reference signal (Uplink Reference Signal (UL-RS)), it is also possible to transmit a reference signal for measurement (sounding reference signal (Sounding Reference Signal (SRS))), a demodulation reference signal (DMRS), etc. In addition, the DMRS can also be referred to as a user terminal-specific reference signal (UE-specific Reference Signal).

[0416] (Base Station)

[0417] Figure 24 FIG. is an example showing the structure of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission path interface (transmission line interface) 140. In addition, one or more of the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140 may be provided respectively.

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

[0419] The control unit 110 implements overall control of the base station 10. The control unit 110 can be composed of a controller, a control circuit, etc. that can be explained based on the common knowledge in the technical field related to the present disclosure.

[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 / reception, measurement, etc. using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequence, etc. to be transmitted as signals, and forward them to the transmission / reception unit 120. The control unit 110 may also perform call processing (setting, releasing, etc.) of communication channels, state management of the base station 10, management of radio resources, etc.

[0421] The transmitting and receiving unit 120 may also include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement 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 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

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

[0423] The transmitting and receiving antenna 130 can be composed of an antenna described based on the common knowledge in the technical field related to the present disclosure, such as an array antenna.

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

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

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

[0427] The transmission / reception unit 120 (transmission processing unit 1211) can also perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filter processing (filtering), Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0428] The transmission / reception unit 120 (RF unit 122) can also perform modulation to the radio frequency band, filter processing, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 130.

[0429] On the other hand, the transmission / reception unit 120 (RF unit 122) can also perform amplification, filter processing, demodulation to the baseband signal, etc. on the radio frequency band signal received through the transmission / reception antenna 130.

[0430] The transmission / reception unit 120 (reception processing unit 1212) can also perform reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filter processing, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, etc. on the obtained baseband signal, and obtain user data, etc.

[0431] The transmission / reception unit 120 (measurement unit 123) may also perform measurements related to the received signal. For example, the measurement unit 123 may also perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may also perform measurements on the received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0432] The transmission path interface 140 may also transmit and receive signals (backhaul signaling) between the device included in the core network 30 (e.g., the network node providing the NF), other base stations 10, etc., and may also obtain and transmit user data (user plane data), control plane data, etc. 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 / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0434] The control unit 110 may also instruct either the operation of searching for the SSB with all SSB indices within a plurality of Synchronization Signal Block (SSB) groups or the operation of searching for the SSB with a specific SSB index within the plurality of SSB groups. The plurality of SSB groups may be frequency division multiplexed, and one SSB group may include a plurality of SSBs that are time division multiplexed. The transmission / reception unit 120 may also transmit the SSB within the plurality of SSB groups (the 0th, first embodiments).

[0435] The transmission / reception unit 120 may also transmit multiple SSBs within 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 110 may also control the reception of a PRACH that is transmitted using one PRACH resource corresponding to one SSB among the multiple PRACH resources corresponding to the multiple synchronization signals within the multiple SSB groups (first and second embodiments).

[0436] (User Equipment)

[0437] Figure 25 FIG. is an example showing the configuration of a user equipment according to an embodiment. The user equipment 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. In addition, one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may be provided respectively.

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

[0439] The control unit 210 implements overall control of the user equipment 20. The control unit 210 may be constituted by a controller, a control circuit, etc. that can be described based on common knowledge in the technical field related to the present disclosure.

[0440] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / 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 / reception unit 220.

[0441] The transmission / reception unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmission / reception unit 220 may be constituted by a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc. that can be described based on common knowledge in the technical field related to the present disclosure.

[0442] The transmission / reception unit 220 can be configured as an integrated transmission / reception unit, or can be composed of a transmission unit and a reception unit. The transmission unit can also be composed of a transmission processing unit 2211 and an RF unit 222. The reception unit can also be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0443] The transmission / reception antenna 230 can be composed of an antenna described based on common knowledge in the technical field related to the present disclosure, such as an array antenna.

[0444] The transmission / reception unit 220 can also receive the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmission / reception unit 220 can also transmit the above-mentioned uplink channels, uplink reference signals, etc.

[0445] The transmission / reception unit 220 can also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc. to form at least one of a transmission beam and a reception beam.

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

[0447] The transmission / reception unit 220 (transmission processing unit 2211) can also perform transmission processing such as channel coding (which can include error correction coding), modulation, mapping, filter processing, DFT processing (if necessary), IFFT processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0448] In addition, regarding whether to apply DFT processing, it can also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is effective (enabled), the transmission / reception unit 220 (transmission processing unit 2211) can also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using the DFT-s-OFDM waveform. In other cases, the transmission / reception unit 220 (transmission processing unit 2211) can also not perform DFT processing as the above-mentioned transmission processing.

[0449] The transmission / reception unit 220 (RF unit 222) can also perform modulation to the radio frequency band, filter processing, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 230.

[0450] On the other hand, the transmission / reception unit 220 (RF unit 222) can also perform amplification, filtering, demodulation to a baseband signal, etc. on a radio frequency band signal received via the transmission / reception antenna 230.

[0451] The transmission / reception unit 220 (reception processing unit 2212) can also perform reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing on the obtained baseband signal, and obtain user data, etc.

[0452] The transmission / reception unit 220 (measurement unit 223) can also perform measurements related to the received signal. For example, the measurement unit 223 can perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 can also measure reception power (e.g., RSRP), reception quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results can also be output to the control unit 210.

[0453] In addition, the transmission unit and the reception unit of the user terminal 20 in the present disclosure can also be constituted by at least one of the transmission / reception unit 220 and the transmission / reception antenna 230.

[0454] The control unit 210 can also determine either an operation of searching for SSBs with all SSB indices within a plurality of synchronization signal block (SSB) groups or an operation of searching for SSBs with specific SSB indices within the plurality of SSB groups. The plurality of SSB groups can be frequency division multiplexed, and one SSB group can include a plurality of SSBs that are time division multiplexed. The transmission / reception unit 220 can also detect one SSB within the plurality of SSB groups (0th, first embodiments).

[0455] The control unit 210 can also determine, based on the frequency offset of the SSB, the SSBs that are frequency division multiplexed for the detected one SSB (first embodiment).

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

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

[0458] The transmitting and receiving unit 220 may also receive one SSB among multiple SSBs within 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 PRACH resource corresponding to the one SSB from among multiple physical random access channel (PRACH) resources corresponding to the multiple synchronization signals within the multiple SSB groups (first and second embodiments).

[0459] The multiple PRACH resources may also be multiple PRACH resources that are frequency division multiplexed and time division multiplexed (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 multiple 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 multiple RAR windows that are time division multiplexed and frequency division multiplexed (second embodiment).

[0462] (Hardware Structure)

[0463] In addition, the block diagrams used in the description of the above embodiments illustrate blocks of functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. Furthermore, the implementation method of each functional block is not particularly limited. That is, each functional block may be implemented by a single device physically or logically combined, or may be implemented by two or more physically or logically separated devices directly or indirectly (e.g., by wire, wireless, etc.) connected and using these multiple devices. The functional block may also be implemented by combining the above single device or the above multiple devices with software.

[0464] Here, in terms of functions, there are judgment, decision-making, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, establishment, comparison, assumption, expectation, regarded as, broadcasting, notifying, communicating, forwarding, configuration (setting), reconfiguration (reconfiguring), allocation (allocating, mapping), assignment, etc., but not limited to these. For example, a functional block (structural unit) that implements the transmission 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 is not particularly limited.

[0465] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure can also function as a computer that performs the processing of the wireless communication method of the present disclosure. Figure 26 FIG. is an example showing the hardware structure of a base station and a user terminal according to an embodiment. The above-mentioned base station 10 and user terminal 20 can also be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0466] In addition, in the present disclosure, terms such as device, circuit, equipment, section, unit, etc. can be rewritten with each other. The hardware structure of the base station 10 and the user terminal 20 can be configured to include one or more of each device shown in the figure, or can be configured not to include some devices.

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

[0468] Regarding each function in the base station 10 and the user terminal 20, for example, by reading a specific software (program) into hardware such as the processor 1001 and the memory 1002, the processor 1001 performs operations and controls communication via the communication device 1004, or controls at least one of reading and writing data in the memory 1002 and the storage 1003, thereby realizing it.

[0469] The processor 1001, for example, operates the operating system to control the entire computer. The processor 1001 may also be constituted by a central processing unit (Central Processing Unit (CPU)) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like. For example, at least a part of the above control unit 110 (210), transmission / reception unit 120 (220), etc. may also be implemented by the processor 1001.

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

[0471] The memory 1002 may also be a computer-readable recording medium, and is constituted by, for example, at least one of a read-only memory (Read Only Memory (ROM)), an erasable programmable read-only memory (Erasable Programmable ROM (EPROM)), an electrically erasable programmable read-only memory (Electrically EPROM (EEPROM)), a random access memory (Random Access Memory (RAM)), and 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 a program (program code), software module, etc. executable for implementing the wireless communication method according to an embodiment of the present disclosure.

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

[0473] The communication device 1004 is hardware (a transmitting and receiving device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. In order to implement at least one of, for example, Frequency Division Duplex (FDD) and 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-described transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. may also be implemented by the communication device 1004. The transmitting and receiving unit 120 (220) may also be physically or logically separated and implemented by a transmitting unit 120a (220a) and a receiving unit 120b (220b).

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

[0475] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be constituted by a single bus or may be constituted by different buses between each device.

[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), a Field Programmable Gate Array (FPGA), etc., and a part or all of each functional block may also be implemented by this hardware. For example, the processor 1001 may also be implemented using at least one of these hardwares.

[0477] (Modification example)

[0478] In addition, the terms described in this disclosure and the terms required for understanding this disclosure may also be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may also be rewritten with each other. In addition, a signal may also be a message. A reference signal can also be abbreviated as RS and may also be referred to as a pilot, a pilot signal, etc. according to the applied standard. In addition, a component carrier (Component Carrier (CC)) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0479] A radio frame may also be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio 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) independent of the numerology.

[0480] Here, the numerology 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 numerology may also represent at least one of a subcarrier spacing (SubCarrier Spacing (SCS)), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (Transmission Time Interval (TTI)), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transmitter-receiver in the frequency domain, a specific windowing process performed by a transmitter-receiver in the time domain, etc.

[0481] A time slot may also be composed of one or more symbols (orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing (OFDM)) symbols, single carrier frequency division multiple access (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 the numerology.

[0482] A time slot may also include a plurality of 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 a smaller number of 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 PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as PDSCH (PUSCH) mapping type B.

[0483] A radio frame, subframe, time slot, mini-slot, and symbol all represent time units for transmitting signals. A radio frame, subframe, time slot, mini-slot, and symbol may also use their respective other names. Additionally, time units such as frames, subframes, time slots, mini-slots, and symbols in the present disclosure can also be rewritten with each other.

[0484] For example, a subframe can also be referred to as a TTI, multiple consecutive subframes can also be referred to as a TTI, a time slot or a mini-slot can also be referred to as a TTI. That is, at least one of a subframe and a TTI can be a subframe (1 ms) in existing LTE, can also be a period shorter than 1 ms (e.g., 1 - 13 symbols), or can also be a period longer than 1 ms. Additionally, the unit representing a TTI may not be referred to as a subframe, but as a time slot, mini-slot, etc.

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

[0486] A TTI can also be a transmission time unit for data packets (transport blocks), code blocks, codewords, etc. that have undergone channel coding, and can also become a processing unit for scheduling, link adaptation, etc. Additionally, when a TTI is given, the time interval (e.g., the number of symbols) in which a transport block, code block, codeword, etc. is actually mapped can also be shorter than the TTI.

[0487] Additionally, when a time slot or a mini-slot is referred to as a TTI, one or more TTIs (i.e., one or more time slots or one or more mini-slots) can also become the minimum time unit for scheduling. Furthermore, the number of time slots (mini-slot numbers) constituting the minimum time unit of this scheduling can also be controlled.

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

[0489] Additionally, a long TTI (e.g., a normal TTI, subframe, etc.) can also be rewritten as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) can also be rewritten as a TTI having a TTI length less than that of the long TTI and 1 ms or more.

[0490] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may also 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, it may also be 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 time 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 (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

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

[0494] A bandwidth part (BWP) (which may also be referred to as a partial bandwidth, etc.) may also represent a subset of consecutive common RBs (common resource blocks) used for a certain parameter set in a certain carrier. Here, the common RBs may also be determined by the index of the RBs based on the common reference point of the carrier. A PRB may also be defined in a certain BWP and be additionally numbered within that BWP.

[0495] An UL BWP (BWP for UL) and a DL BWP (BWP for DL) may also be included in a BWP. For a UE, one or more BWPs may also be set within one carrier.

[0496] At least one of the set BWPs may be active, and the UE may not assume to transmit and receive specific signals / channels outside the active BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be rewritten as "BWP".

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

[0498] In addition, the information, parameters, etc. described in this disclosure can be represented by absolute values, relative values with respect to a specific value, or by corresponding other information. For example, radio resources can also be indicated by a specific index.

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

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

[0501] In addition, information, signals, etc. can be output in at least one of the following directions: from a higher layer to a 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. can be stored in a specific location (e.g., a memory), or can be managed using a management table. The input and output information, signals, etc. can be overwritten, updated, or appended. The output information, signals, etc. can also be deleted. The input information, signals, etc. can also be sent to other devices.

[0503] The notification of information is not limited to the manners / embodiments described in this disclosure and can also be performed by other methods. For example, the notification of information in this disclosure can 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 can also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling can also be referred to as an RRC message, and can also be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration (RRC Connection Re-setup) message, etc. In addition, MAC signaling can also be notified, for example, using a MAC Control Element (MAC CE).

[0505] In addition, the notification of specific information (e.g., the notification of "is X") is not limited to explicit notification and can also be performed implicitly (e.g., by not performing the notification of the specific information or by the notification of other information).

[0506] The determination can be made by a value represented by one bit (0 or 1), can also be made by a true / false value (boolean value) represented by true or false, and can also be made by a numerical comparison (e.g., comparison with a specific value).

[0507] Software, whether referred to as software, firmware, middleware, micro-code, hardware description language, or by any other name, should be broadly construed to mean instructions, instruction sets, code, code segments, program code, programs, sub-programs, 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. can also be sent and received via a transmission medium. For example, in the case of sending software from a website, server, or other remote source using at least one of wired technologies (coaxial cables, fiber optic cables, twisted pairs, Digital Subscriber Line (DSL), etc.) and wireless technologies (infrared, microwave, etc.), at least one of these wired and wireless technologies is included in the definition of the transmission medium.

[0509] Terms such as "system" and "network" used in this disclosure can be used interchangeably. "Network" can also mean a device (e.g., a base station) included in the network.

[0510] In this disclosure, terms such as "precoding", "precoder", "weights (precoding weights)", "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", "panel", etc. can be used interchangeably.

[0511] In the present disclosure, terms such as "Base Station (BS)", "radio 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", "component carrier" can be used interchangeably. There are also cases where a base station is referred to by terms such as macro cell, small cell, femto cell, pico cell, etc.

[0512] A base station can accommodate one or more (e.g., three) cells. In the case where a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, and each of the smaller areas can also provide communication services through a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that provides communication services within the coverage range.

[0513] In the present disclosure, the base station sending information to the terminal can also be rewritten as the base station instructing the terminal to perform control / operation based on the information.

[0514] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "user device (User Equipment (UE))", "terminal" can be used interchangeably.

[0515] There are also cases where a mobile station is referred to by terms such as subscriber station, mobile unit, subscriber unit, radio unit, remote unit, mobile device, radio 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 can also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station can also be a device mounted on a moving object, the moving object itself, etc.

[0517] The moving body refers to an object that can move, with an arbitrary moving speed, and of course includes the case where the moving body stops. The moving body includes, for example, vehicles, transport vehicles, automobiles, two-wheeled motor vehicles (motorcycles), bicycles, connected vehicles, loading shovels, bulldozers, wheel loaders, dump trucks, fork lifts, trains, buses, trolleys, rickshaws, ships (boats and other watercraft), airplanes, rockets, artificial satellites, drones, multi-rotor aircraft, quad-rotor aircraft, balloons, and objects mounted on them. In addition, it is not limited to these. In addition, the moving body can also be a moving body that autonomously travels based on an operation instruction.

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

[0519] Figure 27 FIG. is an example diagram showing 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 rotational 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 drive unit 41 is constituted by, for example, at least one of an engine, a motor, and a hybrid of an engine and a motor. The steering unit 42 is configured to include at least a steering wheel (also referred to as a handlebar), and based on the operation of the steering wheel operated by the user, steer at least one of the front wheels 46 and the rear wheels 47.

[0521] The electronic control unit 49 is composed of a microprocessor 61, a memory (ROM, RAM) 62, and a communication port (for example, an input / output (I / O) 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] As signals from various sensors 50-58, there are current signals from a current sensor 50 that senses the current of the motor, rotational speed signals of the front wheels 46 / rear wheels 47 obtained by a rotational speed sensor 51, air pressure signals of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, vehicle speed signals obtained by a vehicle speed sensor 53, acceleration signals obtained by an acceleration sensor 54, depression amount signals of an acceleration pedal 43 obtained by an acceleration pedal sensor 55, depression amount signals of a brake pedal 44 obtained by a brake pedal sensor 56, operation signals of a shift lever 45 obtained by a shift lever sensor 57, detection signals for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58, and so on.

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

[0524] The information service unit 59 may include an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.) that accepts input from the outside, or may include an output device (for example, a display, a speaker, an LED lamp, a touch panel, etc.) that performs output to the outside.

[0525] The driving assistance system unit 64 is composed of a millimeter-wave radar, Light Detection and Ranging (LiDAR), a camera, a positioning device (such as a Global Navigation Satellite System (GNSS), etc.), map information (such as a high-precision (High Definition (HD)) map, an Autonomous Vehicle (AV) map, etc.), a gyroscope system (such as an inertial measurement device (Inertial Measurement Unit (IMU)), an inertial navigation device (Inertial Navigation System (INS)), etc.), an Artificial Intelligence (AI) chip, an AI processor, and various devices for providing functions to prevent accidents or reduce the driver's driving load, and one or more ECUs for controlling these devices. In addition, the driving assistance system unit 64 transmits and receives various information via the communication module 60 and implements a driving assistance function or an 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 driving 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, and various sensors 50 - 58 in the electronic control unit 49 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 capable of communicating with an external device. For example, various information is transmitted and received via wireless communication between external devices. 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 (and can also function as at least one of the base station 10 and user terminal 20).

[0528] The communication module 60 can also transmit, via wireless communication, at least one of the signals from the various sensors 50-58 input to the electronic control unit 49, the information obtained based on the signals, and the information based on the input from the outside (user) obtained via the information service unit 59. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. can also be referred to as input units that accept input. For example, the PUSCH transmitted through the communication module 60 can also include the 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 can also be referred to as an output unit that outputs information (for example, based on the PDSCH received through the communication module 60 (or the data / information decoded from the PDSCH), outputs information to devices such as a display and a speaker).

[0530] In addition, the communication module 60 stores the various information received from the external device in the memory 62 that can be utilized 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. provided in the vehicle 40 based on the information stored in the memory 62.

[0531] In addition, the base station in the present disclosure can also be rewritten as a user terminal. For example, for a structure in which the communication between the base station and the user terminal is replaced with the communication between multiple user terminals (for example, it can also be referred to as Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), the various modes / embodiments of the present disclosure can also be applied. In this case, it can also be a structure in which the user terminal 20 has the functions of the above base station 10. In addition, terms such as "uplink" and "downlink" can also be rewritten as terms corresponding to inter-terminal communication (for example, "sidelink"). For example, the uplink channel, the downlink channel, etc. can also be rewritten as the sidelink channel.

[0532] Similarly, the user terminal in the present disclosure can also be rewritten as a base station. In this case, it can also be a structure in which the base station 10 has the functions of the above user terminal 20.

[0533] In the present disclosure, operations performed by a base station are sometimes also performed by its upper node depending on the situation. Apparently, 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 the base station, one or more network nodes other than the base station (for example, considering a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0534] Each mode / embodiment described in the present disclosure can be used alone, in combination, or switched during execution. In addition, the processing procedures, sequences, flowcharts, etc. of each mode / embodiment described in the present disclosure can be reordered as long as there is no contradiction. For example, for the methods described in the present disclosure, elements of various steps are presented in the illustrated order, but are not limited to the specific order presented.

[0535] Each mode / embodiment described in the present disclosure can 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 an integer or a decimal, for example)), 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, next-generation systems obtained by enhancing, modifying, fabricating, or prescribing them, etc. In addition, multiple systems can also be combined (for example, a combination of LTE or LTE-A and 5G) and applied.

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

[0537] Any reference to an element using terms such as "first", "second", etc. used in this disclosure does not comprehensively define the quantity or order of these elements. These terms can be used in this disclosure as a convenient method for distinguishing between more than two elements. Therefore, the reference to the first and second elements does not mean that only two elements can be adopted, or that the first element must be prior to the second element in a certain form.

[0538] The term "determining" used in this disclosure may include various actions in some cases. For example, "determining" may also be a case where judging, calculating, computing, processing, deriving, investigating, looking up (searching, inquiring) (such as searching in a table, database, or other data structures), ascertaining, etc. are regarded as performing "determining".

[0539] In addition, "determining" may also be a case where receiving (for example, receiving information), transmitting (for example, transmitting information), input, output, accessing (for example, accessing data in a memory), etc. are regarded as performing "determining".

[0540] In addition, "determining" may also be a case where resolving, selecting, choosing, establishing, comparing, etc. are regarded as performing "determining". That is, "determining" may also be a case where some actions are regarded as performing "determining".

[0541] In addition, "determining" may also be rewritten as "assuming", "expecting", "considering", etc.

[0542] The "maximum transmit power" described in this disclosure may mean either the maximum value of the transmit power, or the nominal maximum transmit power (the nominal UE maximum transmit power), or the rated maximum transmit power (the rated UE maximum transmit power).

[0543] As used in this disclosure, terms such as "connected" and "coupled", or all of their variations, mean all direct or indirect connections or couplings between two or more elements, and can include the case where there is one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination of them. For example, "connected" can also be rewritten as "access".

[0544] In this disclosure, when two elements are connected, it is possible to consider that they are "connected" or "coupled" to each other using one or more wires, cables, printed electrical connections, etc., and as several non-limiting and non-inclusive examples, using electromagnetic energy having wavelengths in the radio frequency domain, microwave region, optical (both visible and invisible) region, etc.

[0545] In this disclosure, the term "A is different from B" can also mean "A and B are different from each other". Additionally, this term can also mean "A and B are each different from C". Terms such as "separated" and "combined" can also be interpreted in the same way as "different".

[0546] When using "include", "including", and their variations in this disclosure, these terms, like the term "comprising", are meant to be inclusive. Furthermore, the term "or" used in this disclosure does not mean exclusive or.

[0547] In this disclosure, for example, in the case where articles are added through translation such as a, an, and the in English, this disclosure can also include the case where the nouns following these articles are in the plural form.

[0548] In this disclosure, "below", "less than", "above", "more than", "equal to", etc. can also be rewritten with each other. In addition, in this disclosure, statements meaning "good", "bad", "big", "small", "high", "low", "early", "late", "wide", "narrow", etc. can also be rewritten with each other without being limited to the positive, comparative, and superlative degrees. Moreover, in this disclosure, statements meaning "good", "bad", "big", "small", "high", "low", "early", "late", "wide", "narrow", etc. can also be rewritten as expressions with "the i-th" (i is an arbitrary integer) attached without being limited to the positive, comparative, and superlative degrees (for example, "highest" can also be rewritten with "the i-th highest").

[0549] In the present disclosure, terms such as "of", "for", "regarding", "related to", "associated with", etc. may also be rewritten with each other.

[0550] As described above, the invention related to the present disclosure has been described in detail. However, for those skilled in the art, the invention related to the present disclosure is obviously not limited to the embodiments described in the present disclosure. The invention related to the present disclosure can be implemented in the form of modifications and changes without departing from the gist and scope of the invention determined based on the description in the claims. Therefore, the description of the present disclosure is for illustrative purposes and does not carry any restrictive meaning for the invention related to the present disclosure.

Claims

1. A terminal, comprising: a receiving unit that receives one SSB among a plurality of SSBs within a 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 control unit that determines, from among a plurality of physical random access channel resources, i.e., a plurality of PRACH resources, corresponding to the plurality of synchronization signals within the plurality of SSB groups, a PRACH resource corresponding to the one SSB.

2. The terminal according to claim 1, wherein, the plurality of PRACH resources are a plurality of PRACH resources that are frequency-division multiplexed and time-division multiplexed.

3. The terminal according to claim 1, wherein, the control unit determines a random access response window, i.e., an RAR window, corresponding to the one PRACH resource, and the RAR window is one RAR window among a plurality of RAR windows that are time-division multiplexed.

4. The terminal according to claim 1, wherein, the control unit determines a random access response window, i.e., an RAR window, corresponding to the one PRACH resource, and the RAR window is one RAR window among a plurality of RAR windows that are time-division multiplexed and frequency-division multiplexed.

5. A wireless communication method for a terminal, comprising: a step of receiving one SSB among a plurality of SSBs within a 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 step of determining, from among a plurality of physical random access channel resources, i.e., a plurality of PRACH resources, corresponding to the plurality of synchronization signals within the plurality of SSB groups, a PRACH resource corresponding to the one SSB.

6. A base station, comprising: a transmitting unit that transmits a plurality of SSBs within a 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 control unit that controls reception of a PRACH that is transmitted using a PRACH resource corresponding to one SSB among the plurality of SSBs, from among a plurality of physical random access channel resources, i.e., a plurality of PRACH resources, corresponding to the plurality of synchronization signals within the plurality of SSB groups.

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