Terminal, wireless communication method, and base station

Abstract

A terminal according to one aspect of the present disclosure comprises: a reception unit that receives settings for the number N of repetitions of a random access preamble and a mask index; and a control unit that determines, on the basis of the mask index, a set of N occasions respectively corresponding to the N repetitions.

Description

Terminal, wireless communication method and base station

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

[0002] Long Term Evolution (LTE) has been specified for the Universal Mobile Telecommunications System (UMTS) network with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Also, LTE-Advanced (3GPP Rel. 10-14) has been specified with the aim of achieving higher capacity and more advanced features than LTE (Third Generation Partnership Project (3GPP (registered trademark)) Release (Rel.) 8, 9).

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

[0004] 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

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

[0006] However, the random access procedure for improving coverage is not clear, and if such a random access procedure is not clear, communication throughput may decrease.

[0007] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that improve the coverage of the random access procedure.

[0008] A terminal according to one aspect of the present disclosure has a receiving unit that receives a setting of the number of repetitions N of a random access preamble and a mask index, and a control unit that determines a set of N occasions that respectively correspond to the N repetitions based on the mask index.

[0009] According to one aspect of the present disclosure, the coverage of the random access procedure can be improved.

[0010] FIG. 1 shows an example of RACH-ConfigCommon. FIGS. 2A and 2B show an example of association between PRACH occasions and beams. FIG. 3 shows an example of FeatureCombinationPreambles-r17. FIG. 4 shows an example of association between PRACH mask indexes and PRACH occasions. FIG. 5 shows an example of timing of multiple PRACH transmissions. FIG. 6 shows an example of RO group determination according to embodiment 1. FIG. 7 shows an example of association between PRACH mask index values ​​and RO group indices. FIG. 8 shows another example of association between PRACH mask index values ​​and RO group indices. FIG. 9 shows an example of RO group determination according to embodiment 3. FIG. 10 shows another example of RO group determination according to embodiment 3. FIG. 11 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 12 is a diagram showing an example of a configuration of a base station according to an embodiment. FIG. 13 is a diagram showing an example of a configuration of a user terminal according to an embodiment. FIG. 14 is a diagram showing an example of hardware configurations of a base station and a user terminal according to an embodiment. FIG. 15 is a diagram illustrating an example of a vehicle according to an embodiment.

[0011] (TCI, spatial relationship, QCL) In NR, it is considered to control the reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, and encoding) in a UE of at least one of a signal and a channel (referred to as a signal / channel) based on a transmission configuration indication state (TCI state).

[0012] The TCI state may represent that which is applied to a downlink signal / channel, and the equivalent of the TCI state that is applied to an uplink signal / channel may be expressed as a spatial relation.

[0013] The TCI state is information about the Quasi-Co-Location (QCL) of signals / channels, and may also be called spatial reception parameters, spatial relation information, etc. The TCI state may be configured in the UE for each channel or signal.

[0014] The QCL is an index indicating the statistical properties of signals / channels. For example, if a signal / channel has a QCL relationship with another signal / channel, it may mean that it can be assumed that at least one of a Doppler shift, a Doppler spread, an average delay, a delay spread, and a spatial parameter (e.g., a spatial Rx parameter) is the same between these different signals / channels (i.e., the signals / channels have a QCL with respect to at least one of these).

[0015] The spatial reception parameters may correspond to a reception beam (e.g., a reception analog beam) of the UE, and the beam may be identified based on a spatial QCL. The QCL (or at least one element of the QCL) in the present disclosure may be replaced with sQCL (spatial QCL).

[0016] A plurality of types (QCL types) of QCL may be defined. For example, four QCL types A to D may be provided, each having different parameters (or parameter sets) that can be assumed to be the same. The parameters (which may be referred to as QCL parameters) are as follows: QCL type A (QCL-A): Doppler shift, Doppler spread, mean delay, and delay spread QCL type B (QCL-B): Doppler shift and Doppler spread QCL type C (QCL-C): Doppler shift and mean delay QCL type D (QCL-D): Spatial reception parameters.

[0017] The UE's assumption that a Control Resource Set (CORESET), channel, or reference signal has a specific QCL (e.g., QCL type D) relationship with another CORESET, channel, or reference signal may be referred to as a QCL assumption.

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

[0019] The TCI state may be, for example, information about the QCL between the channel of interest (in other words, the Reference Signal (RS) for that channel) and another signal (e.g., another RS). The TCI state may be set (indicated) by higher layer signaling, physical layer signaling, or a combination thereof.

[0020] The physical layer signaling may be, for example, Downlink Control Information (DCI).

[0021] The channel for which the TCI state or spatial relationship is set (specified) may be, for example, at least one of a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0022] Furthermore, the RS that has a QCL relationship with the channel may be, for example, at least one of a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a sounding reference signal (SRS), a tracking CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called a QRS).

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

[0024] An RS of QCL type X in a TCI state may refer to an RS that has a QCL type X relationship with a certain channel / signal (DMRS), and this RS may be called a QCL source of QCL type X in the TCI state.

[0025] (Initial Access Procedure) In the initial access procedure, a UE (RRC_IDLE mode) receives an SS / PBCH block (SSB), transmits Msg. 1 (PRACH / random access preamble / preamble), receives Msg. 2 (PDCCH, PDSCH including random access response (RAR)), transmits Msg. 3 (PUSCH scheduled by RAR UL grant), and receives Msg. 4 (PDCCH, PDSCH including UE contention resolution identity). After that, when an ACK for Msg. 4 is transmitted from the UE by the base station (network), an RRC connection is established (RRC_CONNECTED mode).

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

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

[0028] The PBCH has a payload of 56 bits. N repetitions of the PBCH are transmitted within a period of 80 ms, where N depends on the SSB transmission period.

[0029] The system information consists of the MIB, RMSI (SIB1), and other system information (OSI) carried by the PBCH. SIB1 contains information for RACH setup and RACH procedures. The time / frequency resource relationship between the SSB and the PDCCH monitoring resource for SIB1 is configured by the PBCH.

[0030] A base station using beam correspondence transmits multiple SSBs using multiple beams for each SSB transmission period. The multiple SSBs have multiple SSB indices, respectively. When a UE detects an SSB, it transmits a PRACH in the RACH occasion associated with that SSB index and receives an RAR in the RAR window.

[0031] (PRACH Configuration) The serving cell configuration (ServingCellConfig) can include an UL configuration (UplinkConfig). The UplinkConfig can include a list of UL BWP configurations (BWP-Uplink). The BWP-Uplink can include a common UL BWP configuration (BWP-UplinkCommon). The BWP-UplinkCommon can include a common RACH configuration (RACH-ConfigCommon).

[0032] RACH-ConfigCommon is used to specify cell-specific random access parameters. As shown in Figure 1, RACH-ConfigCommon may include a generic RACH configuration (RACH-ConfigGeneric), a total number of RA preambles (totalNumberOfRA-Preambles), and SSB per RACH occasion and contention-based (CB) preambles per SSB (ssb-perRACH-OccasionAndCB-PreamblesPerSSB).

[0033] RACH-ConfigGeneric is used to specify random access parameters for both normal random access and beam failure recovery. RACH-ConfigGeneric may include a PRACH configuration index (prach-ConfigurationIndex) and message 1 FDM (msg1-FDM, the number of PRACH occasions FDMed in one time instance).

[0034] ssb-perRACH-OccasionAndCB-PreamblesPerSSB may contain the number of CB preambles per SSB for oneEighth (one SSB associated with eight RACH occasions) SSBs per RACH occasion.

[0035] The cell group configuration (CellGroupConfig) can include an SpCell configuration (SpCellConfig). The SpCellConfig can include a reconfiguration with synchronization (ReconfigurationWithSync, e.g., handover configuration). The ReconfigurationWithSync can include a dedicated RACH configuration (RACH-ConfigDedicated).

[0036] (PDCCH Order) DCI format 1_0 includes a DCI format identifier field, a bit field that is always set to 1, and a frequency domain resource assignment field. If the cyclic redundancy check (CRC) of DCI format 1_0 is scrambled by the C-RNTI and the frequency domain resource assignment field is all 1s, then DCI format 1_0 is for a random access procedure initiated by a PDCCH order, and the remaining fields are a random access preamble, a UL / supplementary uplink (SUL) indicator, a SS / PBCH index (SSB index), a PRACH mask index, and reserved bits (12 bits).

[0037] For a PRACH transmission triggered by a PDCCH order, the PRACH mask index field indicates the PRACH occasion of the PRACH transmission that is associated with the SS / PBCH block index indicated by the SS / PBCH block index field of the PDCCH order if the value of the random access preamble index field is not zero.

[0038] (Random Access Preamble) For a Type 1 random access procedure (4-step RA type, RA procedure using messages 1 / 2 / 3 / 4), the UE may apply the number N of SS / PBCH blocks associated with one PRACH occasion and the number R of CB preambles per SS / PBCH block per valid PRACH occasion via ssb-perRACH-OccasionAndCB-PreamblesPerSSB.

[0039] In a Type 2 random access procedure (2-step RA type, RA procedure with messages A / B) with common PRACH occasion configuration as the Type 1 random access procedure, the UE is provided with the number N of SS / PBCH block indices associated with one PRACH occasion via ssb-perRACH-OccasionAndCB-PreamblesPerSSB and the number Q of contention-based preambles per SS / PBCH block index per valid PRACH occasion via msgA-CB-PreamblesPerSSB-PerSharedRO. PRACH transmissions may be on a subset of PRACH occasions associated with the same SS / PBCH block index within an SSB-RO mapping cycle for a UE that is provided with a PRACH mask index via msgA-SSB-SharedRO-MaskIndex.

[0040] In a Type 2 random access procedure involving the configuration of a different PRACH occasion from the Type 1 random access procedure, the UE is provided with the number N of SS / PBCH block indices associated with one PRACH occasion and, if provided, the number R of contention-based preambles per SS / PBCH block index per valid PRACH occasion via msgA-CB-PreamblesPerSSB-PerSharedRO, otherwise the UE is provided with the number R of contention-based preambles per SS / PBCH block index per valid PRACH occasion via ssb-perRACH-OccasionAndCB-PreamblesPerSSB.

[0041] In the random access procedure associated with the feature combination indicated by FeatureCombinationPreambles, the UE is provided with the number N of SS / PBCH block indices associated with one PRACH occasion, if ssb-perRACH-OccasionAndCB-PreamblesPerSSB or msgA-ssb-perRACH-OccasionAndCB-PreamblesPerSSB is provided, and is provided with the number S of contention-based preambles per SS / PBCH block index per valid PRACH occasion, via startPreambleForThisPartition and numberOfPreamblesPerSSB-ForThisPartition. PRACH transmissions may be on a subset of PRACH occasions associated with the same SS / PBCH block index within an SSB-RO mapping cycle, for UEs that are provided with a PRACH mask index via ssb-SharedRO-MaskIndex.

[0042] For a Type 1 random access procedure, or for a Type 2 random access procedure with PRACH occasion configuration independent of the Type 1 random access procedure, if N<1, one SS / PBCH block is mapped to 1 / N consecutive valid RACH occasions, and for each valid PRACH occasion, R CB preambles with consecutive indices associated with SS / PBCH block index are provided, starting with preamble index 0. If N>=1, R CB preambles with consecutive indices associated with SS / PBCH block index n (0<=n<-N-1) are provided, starting with preamble index n·N_preamble^total / N, where N_preamble^total is given by totalNumberOfRA-Preambles for a Type 1 random access procedure and by msgA-TotalNumberOfRA-Preambles for a Type 2 random access procedure with PRACH occasion configuration independent of the Type 1 random access procedure. N_preamble^total is a multiple of N.

[0043] Starting from frame 0, the association period for mapping SS / PBCH blocks to PRACH occasions is N Tx SSB The UE selects the smallest value in the set determined by the PRACH configuration period according to the relationship (defined in the specification) between the PRACH configuration period and the associated period (number of PRACH configuration periods) such that N SS / PBCH block indices are mapped to a PRACH occasion at least once in that associated period, where N SS / PBCH block indices are selected from the values ​​of ssb-PositionsInBurst in SIB1 or in the common serving cell configuration. Tx SSB If after an integer number of mapping cycles from SS / PBCH block index to PRACH occasion within the relevant period, NTx SSB If there is a set of PRACH occasions or PRACH preambles that are not mapped to an SS / PBCH block index, then no SS / PBCH block index is mapped to that set of PRACH occasions or PRACH preambles. An association pattern period includes one or more association periods and is determined such that the pattern between PRACH occasions and SS / PBCH block indices repeats at most every 160 ms. If there is a PRACH occasion that is not associated with an SS / PBCH block index after an integer number of association periods, that PRACH occasion is not used for PRACH.

[0044] For PRACH transmissions triggered by higher layers (PRACH transmissions not triggered by a PDCCH order), if ssb-ResourceList is provided, the PRACH mask index is indicated by ra-ssb-OccasionMaskIndex, which indicates the PRACH occasion for the PRACH transmission associated with the selected SS / PBCH block index.

[0045] PRACH occasions are mapped consecutively for each corresponding SS / PBCH block index. The indexing of PRACH occasions indicated by the mask index value is reset for each mapping cycle of consecutive PRACH occasions for each SS / PBCH block index. In the first available mapping cycle, the UE selects for PRACH transmission the PRACH occasion indicated by the PRACH mask index value for the indicated SS / PBCH block index.

[0046] For a given preamble index, the ordering of PRACH occasions is as follows: First, by increasing frequency resource index for PRACH occasions that are frequency multiplexed (at the same time resource index), Second, by increasing time resource index for PRACH occasions that are time multiplexed within a PRACH slot, Third, by increasing PRACH slot index.

[0047] For PRACH transmissions triggered upon request from higher layers, if csirs-ResourceList is provided, the value of ra-OccasionList indicates a list of PRACH occasions for the PRACH transmission, where the PRACH occasions are associated with the selected CSI-RS index indicated by csi-RS. The indexing of the PRACH occasions indicated by ra-OccasionList is reset for each associated pattern period.

[0048] For PRACH configuration periods of 10, 20, 40, 80, and 160 msec, the associated periods are {1, 2, 4, 8, 16}, {1, 2, 4, 8}, {1, 2, 4}, {1, 2}, and {1}, respectively.

[0049] The value of the PRACH mask index value (msgA-SSB-SharedRO-MaskIndex) is associated with the allowed PRACH occasions (PRACH occasion index values) of the SSB.

[0050] FIG. 2A shows an example (mapping 1) of association of PRACH occasions (RACH occasions (ROs)) and beams (SSB / CSI-RS) based on the higher layer parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB. When ssb-perRACH-OccasionAndCB-PreamblesPerSSB indicates oneHalf,n16 (N=½, R=16) and msg1-FDM is 4, four ROs are FDM-multiplexed in one time instance, and one SSB is mapped to two ROs. Preamble indices 0 to 15 are associated with two ROs, and preamble indices 0 to 15 are associated with SSB0. In this way, when N<1, one SSB is mapped to multiple ROs. This increases the RO capacity per beam.

[0051] Figure 2B shows another example (mapping 2) of association of ROs and beams based on the upper layer parameters ssb-perRACH-OccasionAndCB-PreamblesPerSSB. When ssb-perRACH-OccasionAndCB-PreamblesPerSSB indicates n4,n16 (N = 4, R = 16), msg1-FDM is 4, and N_preamble^total is 64, four ROs are FDM-multiplexed in one time instance, and four SSBs are mapped to one RO. One RO is associated with SSBs #0 to #3. Preamble indexes #0 to #15 are associated with SSB #0, preamble indexes #16 to #31 are associated with SSB #1, preamble indexes #32 to #47 are associated with SSB #2, and preamble indexes #48 to #63 are associated with SSB #3. In this way, the same RO is associated with different SS / PBCH block indices, and different preambles use different SS / PBCH block indices. The base station can distinguish the associated SS / PBCH block indices by the received PRACH.

[0052] The random access preamble can only be transmitted in the time resources specified in the random access configuration of the specification, which depends on whether it is FR1 or FR2 and the spectrum type (paired spectrum / supplementary uplink (SUL) / unpaired spectrum). The PRACH configuration index is given by the higher layer parameter prach-ConfigurationIndex or, if configured, by msgA-PRACH-ConfigurationIndex. In the specification, each value of the PRACH configuration index is associated with at least one of the following: preamble format, x and y in n_f (frame number) mod x = y, subframe number, starting symbol, number of PRACH slots in a subframe, number of time-domain PRACH occasions in a PRACH slot N_t^RA,slot, and PRACH duration N_dur^RA.

[0053] Depending on whether PRACH repetition is applicable to a scenario, different types of RACH procedures may be triggered for different purposes. The type of RACH procedure may be at least one of the following: contention-free random access (CFRA), PDCCH ordered RA (RA initiated by a PDCCH order), CFRA for beam failure recovery (BFR), CFRA for system information (SI) request, CFRA for reconfiguration with sync, etc.; contention-based random access (CBRA), RA triggered by a MAC entity, RA triggered by an RRC with an event, CBRA for BFR, etc.; four-step RACH; two-step RACH.

[0054] In the present disclosure, the mapping cycle, the SSB-RO mapping cycle, and the mapping cycle from SS / PBCH block index to PRACH occasion may be read interchangeably.

[0055] (Feature Combination for Msg1 Repetition) Rel. 18 introduces feature combinations for Msg1 repetition. As shown in Fig. 3, FeatureCombinationPreambles-r17 is set for each Msg1 repetition. A mask index value (ssb-SharedRO-MaskIndex) may be set within FeatureCombinationPreambles-r17. In other words, the mask index may be set for each Msg1 repetition.

[0056] The IE FeatureCombinationPreambles associates a set of preambles with a feature combination. FeatureCombinationPreambles includes FeatureCombination-r17 and may include ssb-SharedRO-MaskIndex-r17 and msg1-RepetitionNum-r18. FeatureCombination-r17 indicates which feature combination the preamble indicated by this IE is associated with. msg1-RepetitionNum-r18 is one of {2, 4, 8} and indicates which MSG1 repetition number this FeatureCombinationPreambles is associated with. ssb-SharedRO-MaskIndex-r17 is an integer between 1 and 15 and is a mask index indicating the subset of ROs in which the preamble for this feature combination is located.

[0057] The IE FeatureCombination indicates a feature or combination of features that will be associated with a set of random access resources (i.e., an instance of FeatureCombinationPreambles). FeatureCombination-r17 may include msg1-Repetitions-r18. If msg1-Repetitions-r18 is present, this field indicates that signaling of msg1 repetitions is part of this feature combination.

[0058] (Random Access Procedure in MAC Entity: MAC Protocol Specification / Random Access Procedure Initialization) ra-ssb-OccasionMaskIndex: It defines the PRACH occasions associated with the SSBs on which the MAC entity can transmit the random access preamble. msgA-SSB-SharedRO-MaskIndex: It indicates the subset of 4-step RA type PRACH occasions that are shared with 2-step RA type PRACH occasions for each SSB. If 2-step RA type PRACH occasions are shared with 4-step RA type PRACH occasions and msgA-SSB-SharedRO-MaskIndex is not set, all 4-step RA type PRACH occasions are available for 2-step RA type.

[0059] The values ​​of PRACH Mask Index / msgA-SSB-SharedRO-MaskIndex / ssb-SharedRO-MaskIndex are associated with the allowed PRACH occasions of the SSB (Figure 4). A PRACH Mask Index value of 0 indicates that the allowed PRACH occasions of the SSB are all PRACH occasions. PRACH Mask Index values ​​of 1, 2, ..., 8 indicate that the allowed PRACH occasions of the SSB are PRACH occasion indices 1, 2, ..., 8, respectively. A PRACH Mask Index value of 9 indicates that the allowed PRACH occasions of the SSB are all even PRACH occasion indices. A PRACH Mask Index value of 10 indicates that the allowed PRACH occasions of the SSB are all odd PRACH occasion indices.

[0060] The random access procedure is initiated by a PDCCH order, by the MAC entity itself, or by RRC for specification-compliant events. Within a MAC entity, there can only be one random access procedure in progress at any given time. The random access procedure for an SCell is only initiated by a PDCCH order with ra-PreambleIndex different from 0b000000.

[0061] When a random access procedure is initiated on the serving cell, the MAC entity shall: set RA_TYPE to 4-stepRA if the random access procedure is initiated by a PDCCH order and the ra-PreambleIndex explicitly provided by the PDCCH is not 0b000000, or if the random access procedure is initiated due to a reconfiguration with synchronization and a 4-step RA type contention-free random access resource is explicitly provided by rach-ConfigDedicated for the BWP selected for the random access procedure.

[0062] If the selected RA_TYPE is set to 4-step RA, the MAC entity shall: - If ra-PreambleIndex is explicitly provided by the PDCCH and ra-PreambleIndex is not 0b000000, set PREAMBLE_INDEX to the signaled ra-PreambleIndex and select the SSB signaled by the PDCCH. - If an SSB has been selected as above, determine the next available PRACH occasion from those allowed by the restriction given by ra-ssb-OccasionMaskIndex and corresponding to the selected SSB. (The MAC entity selects a PRACH occasion randomly with equal probability from consecutive PRACH occasions corresponding to the selected SSB according to the specification. The MAC entity may take into account the possibility of measurement gaps when determining the next available PRACH occasion corresponding to the selected SSB.)

[0063] (CFRA with Msg1 repetition) A mask index is set for the CFRA. The number of repetitions may also be set for the CFRA.

[0064] The dedicated RACH configuration (RACH-ConfigDedicated) includes resources, which may include CFRA-TwoStep-r16 and msg1-RepetitionNum-r18. The resources may include ssb. The ssb includes ra-ssb-OccasionMaskIndex.

[0065] CFRA-TwoStep-r16 includes resourcesTwoStep-r16. resourcesTwoStep-r16 includes ra-ssb-OccasionMaskIndex.

[0066] msg1-RepetitionNum indicates the MSG1 repetition number used for contention-free 4-step RA type. If this field is not present, the UE performs contention-free 4-step RA without MSG1 repetition. The presence of msg1-RepetitionNum depends on the condition of 4StepCFRArep. For non-RedCap UE, if resources is set to ssb and there is a FeatureCombinationPreambles entry indicating only msg1-Repetitions associated with the same Msg1 repetition number, the presence of the msg1-RepetitionNum field is optional.

[0067] ra-ssb-OccasionMaskIndex is the explicitly signaled PRACH mask index for RA resource selection.

[0068] (SI Request with Msg1 Repetition) For a system information (SI) request, PRACH resources for 2 / 4 / 8 Msg1 repetitions may be configured. Mask index values ​​may be configured for the number of repetitions: 2 / 4 / 8.

[0069] SI-RequestConfigRepetition-r18 may include a list of SI-RequestResourcesRepetition-r18 for the repetition number of 2, 4, or 8. RequestResourcesRepetition-r18 may include ra-ssb-OccasionMaskIndex-r18.

[0070] (Time Between PDCCH Order Reception and PRACH Transmission) If the random access procedure is initiated by a PDCCH order, the UE, if requested by higher layers, transmits PRACH within the selected PRACH occasion if the time between the last symbol of the PDCCH order reception and the first symbol of the PRACH transmission is greater than or equal to N_(T,2) + Δ_BWPSwitching + Δ_Delay + T_switch [msec] (time condition), as described in the specification. Here, N_(T,2) is the duration of N_2 symbols corresponding to the PUSCH preparation time for UE processing capability 1. Assume that μ corresponds to the minimum subcarrier spacing (SCS) setting between the SCS setting of the PDCCH order and the SCS setting of the corresponding PRACH transmission. If the active UL BWP remains unchanged, Δ_BWPSwitching = 0; otherwise, Δ_BWPSwitching is defined in the specification. In FR1, Δ_delay=0.5 msec, and in FR2, Δ_delay=0.25 msec. T_switch is the switching gap duration defined in the specification.

[0071] (SSB / CSI-RS selection: MAC protocol specification / Random Access Resource selection) If the RA_TYPE is set to 4-step RA, the MAC entity performs the following actions:

[0072] - If an RA procedure is initiated for SpCell beam failure recovery, and the beam failure recovery timer (beamFailureRecoveryTimer) is running or not set, and CFRA resources for the beam failure recovery request associated with at least one SSB / CSI-RS are explicitly provided by RRC, and at least one of the following is available: one or more SSBs with SS-RSRP exceeding the SS-RSRP threshold (rsrp-ThresholdSSB) among the multiple SSBs in the candidate beam RS list (candidateBeamRSList) and one or more CSI-RSs with CSI-RSRP exceeding the CSI-RSRP threshold (rsrp-ThresholdCSI-RS) among the multiple CSI-RSs in the candidate beam RS list (candidateBeamRSList), the MAC entity shall perform the following operations. The MAC entity selects one SSB with an SS-RSRP that exceeds rsrp-ThresholdSSB from among the SSBs in the candidateBeamRSList, or one CSI-RS with a CSI-RSRP that exceeds rsrp-ThresholdCSI-RS from among the CSI-RSs in the candidateBeamRSList. If a CSI-RS is selected and there is an RA-PreambleIndex associated with the selected CSI-RS, the MAC entity sets the preamble index (PREAMBLE_INDEX) to the ra-PreambleIndex corresponding to the SSB in the candidateBeamRSList that is quasi-colocated with the selected CSI-RS. -- Otherwise, set PREAMBLE_INDEX to the ra-PreambleIndex corresponding to the SSB or CSI-RS selected from the set of RA preambles for beam failure recovery request.

[0073] Otherwise, if ra-PreambleIndex is explicitly provided by the PDCCH and is not 0b000000, the MAC entity shall set PREAMBLE_INDEX to the signaled ra-PreambleIndex and select the SSB signaled by the PDCCH.

[0074] Otherwise, if CFRA resources associated with multiple SSBs are explicitly provided in the dedicated RACH configuration (rach-ConfigDedicated) and at least one SSB with SS-RSRP above rsrp-ThresholdSSB is available, the MAC entity shall select one SSB from the associated SSBs with SS-RSRP above rsrp-ThresholdSSB and set PREAMBLE_INDEX to the ra-PreambleIndex corresponding to the selected SSB.

[0075] Otherwise, if CFRA resources associated with multiple CSI-RSs are explicitly provided in the dedicated RACH configuration (rach-ConfigDedicated) and at least one CSI-RS with a CSI-RS SRP above rsrp-ThresholdCSI-RS is available among the multiple CSI-RSs, the MAC entity shall select one CSI-RS with a CSI-RS SRP above rsrp-ThresholdCSI-RS among its associated multiple CSI-RSs and set PREAMBLE_INDEX to the ra-PreambleIndex corresponding to the selected CSI-RS.

[0076] - Otherwise, if an RA procedure is initiated for an SI request and RA resources for the SI request have been explicitly provided by RRC, the MAC entity shall: -- If at least one SSB with SS-RSRP above rsrp-ThresholdSSB is available, the MAC entity shall select one SSB with SS-RSRP above rsrp-ThresholdSSB. -- Otherwise, the MAC entity shall select any SSB. -- The MAC entity shall select an RA preamble corresponding to the selected SSB from the RA preambles examined according to the RA-PreambleStartIndex (ra-PreambleStartIndex) and set PREAMBLE_INDEX to the selected RA preamble.

[0077] - Otherwise (CBRA preamble selection), the MAC entity shall: -- If at least one SSB with SS-RSRP above rsrp-ThresholdSSB is available, the MAC entity shall select one SSB with SS-RSRP above rsrp-ThresholdSSB. -- Otherwise, the MAC entity shall select any SSB.

[0078] - If an RA procedure is initiated for an SI request and ra-AssociationPeriodIndex and si-RequestPeriod are set, the MAC entity determines the next available PRACH occasion from those corresponding to the selected SSB within the association period given by ra-AssociationPeriodIndex within si-RequestPeriod that are allowed by the constraint given by ra-ssb-OccasionMaskIndex (if it is set) (the MAC entity selects a PRACH occasion randomly with equal probability from consecutive PRACH occasions corresponding to the selected SSB).

[0079] Otherwise, if the SSB is selected, the MAC entity performs the following steps: -- If a set of RA resources associated with a Msg1 repetition is selected for this RA procedure, the MAC entity determines the set of next available PRACH occasions corresponding to the selected SSB, for the Msg1 repetition number applied to this RA procedure, as allowed by the constraints given by ra-ssb-OccasionMaskIndex (if it is set) or ssb-SharedRO-MaskIndex (if it is set). (The MAC entity selects PRACH occasions randomly with equal probability from among consecutive PRACH occasions corresponding to the selected SSB and the Msg1 repetition number of this RA procedure, regardless of the FR2 UL gap; the MAC entity may take into account the possible occurrence of measurement gaps and MUSIM gaps when determining the next available set of PRACH occasions corresponding to the selected SSB.) -- Otherwise, the MAC entity determines the next available PRACH occasion from the PRACH occasions corresponding to the selected SSB as allowed by the constraints given by ra-ssb-OccasionMaskIndex (if set) or ssb-SharedRO-MaskIndex (if set). (The MAC entity selects a PRACH occasion randomly with equal probability from consecutive PRACH occasions according to the procedure corresponding to the selected SSB, regardless of the FR2 UL gap; the MAC entity may take into account the possible occurrence of measurement gaps and MUSIM gaps when determining the next available PRACH occasion corresponding to the selected SSB.)

[0080] Otherwise, if the above CSI-RS is selected, the MAC entity performs the following steps: -- if there is no CFRA resource associated with the selected CSI-RS, the MAC entity determines the next available PRACH occasion from the PRACH occasions as allowed by the constraints given by the ra-ssb-OccasionMaskIndex (if it is set) (the MAC entity selects a PRACH occasion randomly with equal probability from consecutive PRACH occasions corresponding to the selected CSI-RS and QCL'd SSB, regardless of the FR2 UL gap; the MAC entity may take into account the possible occurrence of measurement gaps and MUSIM gaps when determining the next available PRACH occasion corresponding to the selected CSI-RS and QCL'd SSB). -- Otherwise, the MAC entity determines the next available PRACH occasion from the PRACH occasions in the ra-OccasionList corresponding to the selected CSI-RS (the MAC entity selects a PRACH occasion randomly with equal probability from PRACH occasions occurring simultaneously on different subcarriers corresponding to the selected CSI-RS, regardless of the FR2 UL gap; the MAC entity may take into account the possibility of measurement gaps and MUSIM gaps occurring when determining the next available PRACH occasion corresponding to the selected CSI-RS).

[0081] That is, in the Msg1 repetition, the MAC entity determines the set of allowed PRACH occasions by the mask index value.

[0082] (Valid / Invalid Conditions for PRACH Occasions) In paired spectrum (FDD) or SUL band, all PRACH occasions are valid. In unpaired spectrum (TDD), PRACH occasions may comply with the following provisions 1 and 2. [Provision 1] When the UE is not provided with tdd-UL-DL-ConfigurationCommon, a PRACH occasion in a PRACH slot is valid if it does not precede an SS / PBCH block in the PRACH slot and starts at least N_gap symbols after the last SS / PBCH block received symbol. Here, N_gap is specified in the specifications. When channelAccessMode=semistatic is provided, it does not overlap with the set of consecutive symbols before the start of the next channel occupancy period in which the UE does not transmit. The candidate SS / PBCH block index of an SS / PBCH block corresponds to the SS / PBCH block index provided by ssb-PositionsInBurst in SIB1 or in ServingCellConfigCommon. [Provision 2] If the UE is provided with tdd-UL-DL-ConfigurationCommon, a PRACH occasion in a PRACH slot is valid if: - the PRACH occasion is in an UL symbol, or - the PRACH occasion does not precede an SS / PBCH block in the PRACH slot and starts at least N_gap symbols after the last DL symbol and at least N_gap symbols after the last SS / PBCH block symbol, where N_gap is specified in the specification. If channelAccessMode=semistatic is provided, the PRACH occasion does not overlap with the set of consecutive symbols before the start of the next channel occupation period during which there must be no transmission, as described in the specification.The candidate SS / PBCH block indices for the SS / PBCH blocks correspond to the SS / PBCH block indices provided by ssb-PositionsInBurst in SIB1 or in ServingCellConfigCommon as described in the specification.

[0083] (Analysis) The UE repeatedly transmits Msg1 on K Random Access Occasions (ROs) / RO resources. The UE then waits to detect Msg2 on the configured Type 1 PDCCH occasion. In this disclosure, the repeated transmission of the preamble on K ROs / RO resources may be referred to as an RO group. Figure 5 shows an example of the timing of multiple PRACH transmissions. In this example, the size of the RO group (the number of ROs in the RO group) is K. After one RO group, one RAR window begins.

[0084] In this disclosure, an RO group may be defined as consisting of K valid ROs that are TDM'd, with a single RO in the frequency domain for each time occasion. In other words, once an RO group is selected, the RO for each PRACH transmission is determined. For the repetition number K=2, an RO group consists of two consecutive ROs that are TDM'd.

[0085] For multiple PRACH repetitions with a PRACH mask index indication, at least one of the following options may be selected: ◆ Option 1: The UE applies the PRACH mask before RO group determination. The RO group is determined based on the RO indicated by the PRACH mask index. ◆ Option 2: The UE applies the PRACH mask after RO group determination. The UE applies the PRACH mask only on the RO group that has all the ROs indicated by the mask. preamble rep Option 3: The UE applies the PRACH mask after RO group determination. The UE transmits N preamble repetitions only on RO groups where at least one RO is indicated by the mask.preamble rep Option 4: The UE applies a PRACH mask after RO group determination, where the PRACH mask index indicates one or more RO groups for multi-PRACH transmission. This means that the PRACH mask index indicates an RO group instead of an RO.

[0086] If option 1 is adopted, it is not clear how to determine the RO group based on the indicated mask index.

[0087] If option 2 / 3 is adopted, it is not clear how to transmit the preamble on the ROs in the selected RO group.

[0088] If option 4 is adopted, it is not clear how the mask index indicates the RO group.

[0089] If operations related to multi-PRACH transmission are not sufficiently considered, there is a risk that communication quality / throughput will deteriorate.

[0090] Therefore, the present inventors have studied multi-PRACH transmission methods and conceived the following embodiments.

[0091] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0092] (Various Reinterpretations) In the present disclosure, a word enclosed in "( )" in a sentence may indicate an explanation of the word immediately preceding it (for example, an explanation of spelling), a paraphrase, a specific example, a supplementary explanation, etc. Furthermore, in the present disclosure, a word enclosed in "[ ]" in a sentence may be interpreted including the word in the meaning of the entire sentence, or may be interpreted excluding (ignoring) the word in the meaning of the entire sentence. Note that "( )" and "[ ]" may also be used for purposes / meanings other than those mentioned above.

[0093] In the present disclosure, "A / B" and "at least one of A and B" may be interpreted interchangeably. Also, in the present disclosure, "A / B / C" may mean "at least one of A, B, and C."

[0094] In the present disclosure, terms such as notify, activate, deactivate, indicate (or indicate), select, configure, update, and determine may be read interchangeably. In the present disclosure, terms such as support, control, controllable, operate, and operate may be read interchangeably.

[0095] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, fields, information elements (IEs), settings, etc. may be interchangeable. In the present disclosure, Medium Access Control (MAC) control elements (CEs), update commands, activation / deactivation commands, etc. may be interchangeable.

[0096] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, other messages (e.g., messages from the core network such as positioning protocol (e.g., NR Positioning Protocol A (NRPPa) / LTE Positioning Protocol (LPP)) messages), or a combination thereof.

[0097] In the present disclosure, MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. Broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0098] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0099] In the present disclosure, ceil(x), ceiling function, and ceiling function may be interchangeable. In the present disclosure, floor(x), floor function, and floor function may be interchangeable. In the present disclosure, sqrt(x), square root of x, and root x may be interchangeable. In the present disclosure, x mod y, mod(x, y), mod function, and modulo operation may be interchangeable. In the present disclosure, Σ i=M M＋N－1 f(i), Σ i=M M+N-1 f i , f(i) or f for i = M, M+1, ..., M+N-1 i Summation of f(M) + f(M+1) + ... + f(M+N-1), f M +f M＋1 +...+f M＋N－1 , may be read interchangeably. C(n, k) is the number of combinations of k values ​​selected from n values ​​(combinatorial coefficient), binomial coefficients, n Ck , C n k In the present disclosure, x / y and floor(x / y) may be read as interchangeable.

[0100] In this disclosure, a b , a_b, and a with b added to the bottom right of a may be read interchangeably. c , a^c, and the notation of a with c added to the upper right of a may be read interchangeably. b c , a_b^c, and the notation in which b is added to the bottom right of a and c is added to the top right may be read interchangeably. ～ may be expressed by adding 〜 to the x, or may be referred to as x tilde. － may be represented by an x ​​with a - above it, or may be called an x-bar.

[0101] In the present disclosure, FR may be, for example, at least one of FR1, FR2, FR2-1, FR2-2, FR3, sub-terahertz, and terahertz. In the present disclosure, the frequency range corresponding to FR1 may be 410-7125 MHz. In the present disclosure, FR2 may include FR2-1 and FR2-2, and the frequency range corresponding to FR2-1 may be 24250-52600 MHz, and the frequency range corresponding to FR2-1 may be 52600-71000 MHz.

[0102] In the present disclosure, the base station (BS), gNB, and network (NW) may be interchangeable.

[0103] In the present disclosure, PRACH, preamble, random access preamble, and message (Msg) 1 may be interchangeable.

[0104] In the present disclosure, preamble repetition, multi-PRACH transmission, and PRACH transmission with preamble repetition may be read interchangeably.

[0105] In the present disclosure, RO, PRACH occasion, PRACH occasion index, occasion, and time and frequency resource may be read interchangeably.

[0106] In the present disclosure, PRACH occasions indicated by a mask index value, PRACH occasions permitted / allowed by restrictions given by a mask index value, and "permitted / allowed PRACH occasions" may be read interchangeably.

[0107] In this disclosure, the number of repetitions, the repetition factor, N preamble rep , N, the number of preamble repetitions, may be read interchangeably.

[0108] In this disclosure, the RO group, N preamble rep PRACH Occasions, N preamble rep N preamble (Msg1) repetitions preamble rep a set of valid PRACH occasions, N preamble rep A set of PRACH occasions may be read interchangeably.

[0109] In the present disclosure, the mask index, mask index value, PRACH mask index, PRACH mask, and ssb-SharedRO-MaskIndex-r17 may be read as interchangeable.

[0110] (Wireless Communication Method) <Assumption> In each embodiment, ssb-SharedRO-MaskIndex may be set in FeatureCombinationPreambles associated with a feature combination for Msg1 repetition, and more than one RO may be set for each SSB in RACH-ConfigCommon including FeatureCombinationPreambles. Alternatively, in each embodiment, ra-ssb-OccasionMaskIndex may be set in SI-RequestConfigRepetition-r18, and more than one RO may be set for each SSB in the SI-RequestConfigRepetition-r18. Alternatively, in each embodiment, msg1-RepetitionNum-r18 may be set in a CFRA in RACH-ConfigDedicated, and more than one RO may be set for each SSB in the CFRA.

[0111] Embodiment 1 This embodiment relates to RO group determination based on ROs indicated by mask index values. This embodiment relates to Option 1 above.

[0112] The UE selects N PRACH occasions (ROs) from the PRACH occasions (ROs) indicated by the mask index value. preamble rep The RA-SSB-Routing-Based-OccasionMaskIndex may be used to determine one or more sets of valid PRACH occasions, whose mask index values ​​may be, for example, ra-ssb-OccasionMaskIndex or ssb-SharedRO-MaskIndex. preamble rep Each set of valid PRACH occasions may include PRACH occasions indicated by a mask index value.

[0113] Variation: In counting TimeOffsetBetweenStartingRO PRACH occasions for determining the first valid RO of a subsequent RO group, if multiple SSB indices are counted, only PRACH occasions associated with the same SSB index and the same preamble, as indicated by the mask index value, may be counted.

[0114] Variation: In counting TimeOffsetBetweenStartingRO PRACH occasions for determining the first valid RO of a subsequent RO group, if multiple SSB indices are counted, the mask index value may not be taken into account.

[0115] For the random access preamble of the specification (Physical layer procedures for control / Random access procedure), at least one of the following procedures may be defined:

[0116] ◆N preamble rep For a PRACH transmission with N preamble repetitions, if a mask index value is provided, the set is N consecutive in time indicated by that value. preamble rep A set of N valid PRACH occasions uses the same frequency resource and is associated with the same one or more SS / PBCH block indices, and each SS / PBCH block index is associated with the same preamble index in all valid PRACH occasions in the set. preamble rep For a PRACH transmission with preamble repetitions, if a mask index value is provided, all respective valid PRACH occasions indicated by that value are consecutive in time, use the same frequency resource, and are associated with the same SS / PBCH block index.

[0117] ◆N preamble repIn a PRACH transmission with preamble repetitions, the time period starting from frame 0 is N Tx SSB The minimum integer number of association pattern periods such that at least one set of valid PRACH occasions for each of the N SS / PBCH block indices can be determined within that time period for every configured number of preamble repetitions. The set of valid PRACH occasions for each configured number of preamble repetitions repeats for every configured time period. ◆ Variation: N preamble rep In a PRACH transmission with preamble repetitions, the time period starting from frame 0 is the same as the configured number N of preamble repetitions. preamble rep Within that time period, N Tx SSB The SS / PBCH block indices are N preamble rep is the smallest integer number of association pattern periods from an SS / PBCH block to a PRACH occasion that are mapped at least once to N preamble repetitions. preamble rep This set of PRACH occasions repeats for each time period.

[0118] ◆ N associated with one SS / PBCH block preamble rep N in time period for preamble repetitions preamble rep In a PRACH transmission with N preamble repetitions, preamble repFor a set of valid PRACH occasions, several procedures may be defined: ◆ The first PRACH occasion of the first set is the first valid PRACH occasion indicated by a mask index value, if provided. ◆ The first PRACH occasion of a subsequent set, if any, is determined according to the order of valid PRACH occasions indicated by a mask index value, if provided. The order may be one of the following: ◆ First, ascending order of frequency resource index for frequency multiplexed PRACH occasions (at the same time resource index). ◆ Second, ascending order of time resource index for time multiplexed PRACH occasions.

[0119] ◆ Here, for each frequency resource index in the frequency-multiplexed PRACH occasions, the following procedures may be defined: ◆ The first PRACH occasion of the first set is the first valid PRACH occasion indicated by a mask index value, if provided. ◆ The first PRACH occasion of a subsequent set, if any, is given by the following procedures: ◆ If TimeOffsetBetweenStartingRO is provided, the occasion is the first valid PRACH occasion that is after TimeOffsetBetweenStartingRO consecutive valid PRACH occasions in time from the first valid PRACH occasion of the previous set, as indicated by a mask index value, if provided. Here, each PRACH occasion is associated with the same SS / PBCH block index (indicated by a mask index value, if provided), and each SS / PBCH block index is associated with the same preamble. --◆If TimeOffsetBetweenStartingRO is not provided, the occasion is after the PRACH occasion of the previous set, as indicated by the Mask Index value, if provided.

[0120] In the present disclosure, the time period and the period of the RO group may be read interchangeably.

[0121] 6 shows an example of RO group determination according to the first embodiment. In this example, one RO group includes four ROs. That is, four PRACH repetitions are configured in this example. The mask index may be reset for each SSB-RO mapping cycle. If the mask index indicates the first PRACH occasion (RO) in one SSB-RO mapping cycle, the first ROs #0, #8, #16, and #24 for SSB #0 from the four SSB-RO mapping cycles are determined as one RO group for SSB #0.

[0122] According to this embodiment, the UE can properly determine the RO group for PRACH repetition.

[0123] Embodiment 2 This embodiment relates to RO group selection based on ROs indicated by mask index values. This embodiment relates to Option 2 / 3 above.

[0124] The UE may determine the RO group candidates without considering the indicated mask index value.

[0125] The UE may select an RO group (to be used for PRACH transmission) based on the indicated mask index value (from the determined one or more candidate RO groups). Procedures may be defined for at least one of the following cases:

[0126] ◆ Case 1: (For Option 2) If the UE is going to select an RO group such that all ROs in the RO group are valid ROs as indicated by the mask index value, the UE expects / assumes at least one RO group with all valid ROs as indicated by the mask index value. For this case, at least one of the following examples may be defined: - ◆ Example: The UE does not expect / assume that the number of ROs for one SSB is greater than the number of FDMed ROs in one time instance and the mask index value is configured. - ◆ Example: If the number of ROs for one SSB is greater than the number of FDMed ROs in one time instance, the UE expects / assumes that the configured mask index value indicates multiple allowed PRACH occasion indices. - ◆ Example: In one SSB-RO mapping cycle, there may be only one RO with the same frequency resource index.

[0127] ◆ Case 2: (Regarding Option 3) When a UE is selecting an RO group such that at least one RO in the RO group is a valid RO indicated by a mask index value, at least one of the following options 2-x may be defined for preamble transmission: - ◆ Option 2-1: The UE may transmit a preamble only on one or more valid PRACHs in that RO group indicated by the mask index value. On valid PRACH occasions in that RO group that are not indicated by the mask index value, the UE may not transmit a preamble. - ◆ Option 2-2: The UE may transmit a preamble on each valid PRACH occasion in that RO group.

[0128] According to this embodiment, the UE can properly determine the RO group for PRACH repetition.

[0129] Embodiment 3 This embodiment relates to RO group selection based on mask index values. This embodiment relates to option 4 above.

[0130] The UE may determine the RO group without considering (the existing interpretation of) the indicated mask index value.

[0131] One or more RO groups may be indicated by (a novel interpretation of) the mask index value.

[0132] For RA procedures with multiple preamble repetitions, a new mask index rule may be defined / introduced, where the multiple preamble repetitions are N preamble rep may be associated with a function combination with N preamble repetitions, preamble rep may be associated with an SI request with N preamble repetitions, preamble rep It may be associated with RACH-ConfigDedicated with preamble repetitions.

[0133] The reset timing of the indexing of the mask index may be defined by at least one of the following options 1-x: ◆Option 1-1: The indexing of the mask index may be reset every time period for each SSB. The time period may be the time period in embodiment 1. ◆Option 1-2: The indexing of the mask index may be reset every RO group mapping cycle for each SSB.

[0134] The mapping between the mask index value and the RO group index may be defined by at least one of the following options 2-x: ◆ Option 2-1: The mask index value may directly indicate the RO group index. ◆ Option 2-2: The relationship between the mask index value and the corresponding allowed RO group may be defined by the specification or configured by the gNB. For example, similar to the association between the PRACH mask index value and the allowed PRACH occasions of SSB in the above-mentioned "Random Access Procedure in the MAC Entity," one value of the mask index may correspond to one RO group index or multiple RO groups. The multiple RO groups may correspond to odd-numbered RO group indexes, even-numbered RO group indexes, or all RO groups. As in the example of Figure 7, the association between the PRACH mask index value and the RO group index may be defined in the specification. In this example, the mask index value 0 indicates all RO groups, and the mask index values ​​1 and 2 indicate the RO group indexes 1 and 2, respectively. The association between PRACH mask index values ​​and RO group indices may be defined in the specification, as in the example of Figure 8. In this example, a mask index value of 0 indicates all RO groups, a mask index value of 1 indicates RO groups with odd RO group indices, and a mask index value of 2 indicates RO groups with even RO group indices.

[0135] The indexing order of the RO groups may be based on the first or last valid RO of the RO group. The order may be, first, ascending order of frequency resource index for frequency-multiplexed PRACH occasions (at the same time resource index), or, second, ascending order of time resource index for time-multiplexed PRACH occasions. The indexing of the RO groups may be defined by at least one of several options 3-x below: ◆ Option 3-1: The indexing of the RO groups may be reset every time period per SSB. ◆ Option 3-2: The indexing of the RO groups may be reset every RO group mapping cycle per SSB.

[0136] In option 1-2 / 3-2, the "RO group mapping cycle" may be defined in the specification or N for all SSB indices. preamble rep It may be defined as a cycle of mapping / determination of at least one RO group for a number of preamble repetitions.

[0137] In the present disclosure, the RO group mapping cycle and the RO group period for all SSBs may be read interchangeably.

[0138] 9, the mask index indexing is reset every time period. The mask index value indicates RO group #1, and the indicated RO group is the four ROs corresponding to time resource indexes 0, 1, 4, and 5 and frequency resource index 0.

[0139] 10 shows an example in which the mask index indexing is reset for each RO group mapping cycle. In this example, the RO group mapping cycle for repetition number 4 is the time from the start of time resource index 0 to the start of time resource index 8. The mask index value indicates RO group #1, and the indicated RO group is the 8 ROs corresponding to time resource index 0 and frequency resource indexes 0, 1, 4, 5, 8, 9, 12, and 13.

[0140] According to this embodiment, the UE can properly determine the RO group for PRACH repetition.

[0141] <Supplementary Information> <<Notification of Information to UE>> In the above-described embodiments, notification of any information to the UE [from a Network (NW) (e.g., a Base Station (BS))] (in other words, reception of any information from the BS by the UE) may be performed using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel (e.g., PDCCH, PDSCH, reference signal), or a combination thereof.

[0142] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new Logical Channel ID (LCID) in the MAC subheader, which is not defined in existing standards.

[0143] When the notification is made by DCI, the notification may be made by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used to scramble Cyclic Redundancy Check (CRC) bits assigned to the DCI, the format of the DCI, etc.

[0144] Furthermore, notification of any information to the UE in the above embodiments may be performed periodically, semi-persistently, or aperiodically.

[0145] <<Notification of Information from UE>> In the above-described embodiments, notification of any information from the UE [to the NW] (in other words, transmission / report of any information from the UE to the BS) may be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel (e.g., PUCCH, PUSCH, PRACH, reference signal), or a combination thereof.

[0146] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new LCID, which is not defined in existing standards, in the MAC subheader.

[0147] If the notification is made by UCI, the notification may be transmitted using PUCCH or PUSCH.

[0148] Furthermore, any information in the above-described embodiments may be notified from the UE periodically, semi-persistently, or aperiodically.

[0149] <<Regarding Application of Each Embodiment>> In a UE / BS, specific (one or more) processes / operations / controls / assumptions / information for at least one of the above-mentioned embodiments may be applied (used) when one or more of the following conditions are met: - a higher layer parameter indicating the specific processes / operations / controls / assumptions / information is configured; - the specific processes / operations / controls / assumptions / information is determined based on related higher layer parameters; - the specific processes / operations / controls / assumptions / information is specified / activated / triggered by a MAC CE / DCI / UCI / resource / channel / RS; - a specific UE capability indicating (or related to) the specific processes / operations / controls / assumptions / information is reported or supported; - the application of the specific processes / operations / controls / assumptions / information is determined based on specific conditions.

[0150] The specific UE capability may indicate at least one of the following: - Supporting the specific process / operation / control / assumption / information - Capability of each embodiment - Capability of each option in each embodiment, or capability of a combination of multiple options in each embodiment - Capability of each option in each embodiment, or capability of a combination of multiple options in each embodiment - The UE supports determination of an RO group based on multiple ROs indicated by a mask index value for a Msg1 repetition - The UE supports selection of an RO group with any RO not indicated by a mask index value for a Msg1 repetition - The UE supports selection of an RO group based on an indicated mask index value.

[0151] Furthermore, the above-mentioned specific UE capability may be a capability that is applied across all frequencies (commonly regardless of frequency), or may be 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.), or may be a capability for each frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or may be a capability for each subcarrier spacing (SubCarrier Spacing (SCS)), or may be a capability for each Feature Set (FS) or Feature Set Per Component-carrier (FSPC).

[0152] Furthermore, the specific UE capability may be a capability that is applied to all duplexing methods (commonly regardless of the duplexing method), or may be a capability for each duplexing method (e.g., Time Division Duplex (TDD) or Frequency Division Duplex (FDD)).

[0153] If the above conditions are not met, the UE / BS may follow the behavior specified in existing 3GPP releases.

[0154] (Supplementary Notes) The following inventions are supplemented with respect to one embodiment of the present disclosure. [Supplementary Note 1] A terminal having: a receiving unit that receives a setting of a number N of repetitions of a random access preamble and a mask index; and a control unit that determines a set of N occasions corresponding to the N repetitions, respectively, based on the mask index. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the control unit determines the set from a plurality of occasions indicated by the mask index. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein the control unit determines one or more candidates for a set, and determines the set from the one or more candidates based on the mask index. [Supplementary Note 4] The terminal according to any one of Supplementary Notes 1 to 3, wherein the mask index corresponds to one or more indexes of one or more sets.

[0155] (Wireless Communication System) The configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination thereof.

[0156] 11 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 (which may be simply referred to as system 1) may be a system that realizes communication using Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0157] The wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0158] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (Secondary Node (SN)). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0159] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity in which both the MN and SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0160] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The location, number, shape, size, etc. of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as the base station 10.

[0161] The wireless communication system 1 may utilize multi-input multi-output (MIMO). For example, one cell may be formed by one antenna / base station 10, or may be formed by multiple antennas / base stations 10. One [virtual] cell (which may be called, for example, a supercell) may be composed of multiple [virtual] cells (which may be called, for example, subcells). A supercell may correspond to a cell with a fixed physical range, and a subcell may correspond to a cell with a quasi-static / dynamically variable physical range. In this case, the wireless communication system 1 may be called a cell-free system.

[0162] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CCs) and dual connectivity (DC).

[0163] Each CC may 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 be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a higher frequency band than FR2.

[0164] Furthermore, the user terminal 20 may perform communication using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0165] The multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with the Common Public Radio Interface (CPRI), an X2 / Xn 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 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0166] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0167] The core network 30 may include network functions (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 Operation, Administration and Maintenance (Management) (OAM). A single network node may provide multiple functions. Communication with an external network (e.g., the Internet) may also be performed via the DN.

[0168] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0169] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the wireless communication system 1. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like may be used in at least one of the downlink (DL) and uplink (UL).

[0170] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (e.g., other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0171] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as the downlink channel.

[0172] Furthermore, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), or the like may be used as an uplink channel.

[0173] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0174] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information for at least one of the PDSCH and the PUSCH.

[0175] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as a UL grant, a UL DCI, etc. Note that the PDSCH may be replaced with DL data, and the PUSCH may be replaced with UL data.

[0176] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources for searching for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.

[0177] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the terms "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," "CORESET configuration," and the like in the present disclosure may be read interchangeably.

[0178] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0179] In the present disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

[0180] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0181] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including an SS (PSS, SSS) and a PBCH (and a DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as a reference signal.

[0182] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), or the like may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0183] (Base Station) Fig. 12 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0184] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0185] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0186] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 120. The control unit 110 may perform call processing (setting up, releasing, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0187] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0188] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, the RF unit 122, and a measurement unit 123.

[0189] The transmitting and receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0190] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0191] The transceiver 120 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0192] The transmitter / receiver unit 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0193] The transmitter / receiver unit 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0194] The transceiver unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 130.

[0195] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 130.

[0196] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0197] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may measure 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 be output to the control unit 110.

[0198] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30 (e.g., network nodes that provide NF), other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0199] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0200] The base station 10 may be separated into three elements: a radio unit (RU), a distributed unit (DU), and a central unit (CU). For example, the RU may implement RF processing (digital beamforming, digital-to-analog conversion, analog beamforming, etc.) and lower-level functions of the physical layer (precoding, IFFT, FFT, etc.). The DU may implement higher-level functions of the physical layer (coding to resource element mapping, etc.), MAC layer functions, and RLC layer functions. The CU may implement the functions of the PDCP layer, Service Data Adaptation Protocol (SDAP) layer, and RRC layer.

[0201] In the present disclosure, the base station 10 may include a single device that realizes all of the functions of the RU, DU, and CU, or may include multiple devices that each realize some of the functions of the RU, DU, and CU and are connected to each other. In the present disclosure, the base station 10 may be interchangeably read as RU / DU / CU.

[0202] The transceiver 120 may transmit a setting of the number of repetitions N of the random access preamble and a mask index. The controller 110 may determine a set of N occasions corresponding to the N repetitions based on the mask index. The controller 110 may control reception of the repetitions in the set.

[0203] (User Terminal) Fig. 13 is a diagram showing an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0204] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0205] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from a controller, a control circuit, etc., which are described based on common understanding in the technical field to which the present disclosure relates.

[0206] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission and reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals and transfer them to the transceiver unit 220.

[0207] The transceiver 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 transceiver unit 220 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0208] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0209] The transmitting / receiving antenna 230 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0210] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0211] The transceiver unit 220 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0212] The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0213] The transmitter / receiver unit 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0214] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and if not, it may not be necessary to perform DFT processing as the transmission processing.

[0215] The transceiver unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 230.

[0216] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 230.

[0217] The transceiver unit 220 (reception processing unit 2212) may apply 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 to the acquired baseband signal, and acquire user data, etc.

[0218] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0219] The measurement unit 223 may derive channel measurements for CSI calculation based on the channel measurement resources. The channel measurement resources may be, for example, non-zero power (NZP) CSI-RS resources. The measurement unit 223 may also derive interference measurements for CSI calculation based on the interference measurement resources. The interference measurement resources may be at least one of an NZP CSI-RS resource for interference measurement, a CSI-Interference Measurement (IM) resource, etc. Note that CSI-IM may be referred to as CSI-Interference Management (IM) or may be interchangeably read as Zero Power (ZP) CSI-RS. Note that in the present disclosure, CSI-RS, NZP CSI-RS, ZP CSI-RS, CSI-IM, CSI-SSB, etc. may be interchangeably read as interchangeable.

[0220] The transmitting unit and receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving unit 220 and the transmitting / receiving antenna 230.

[0221] The transceiver 220 may receive a setting of the number of repetitions N of the random access preamble and a mask index. The controller 210 may determine a set of N occasions corresponding to the N repetitions based on the mask index. The controller 210 may control transmission of the repetitions in the set.

[0222] The control unit 210 may determine the set from a plurality of occasions indicated by the mask index.

[0223] The control unit 210 may determine one or more candidates for a set, and determine the set from the one or more candidates based on the mask index.

[0224] The mask index may correspond to one or more indices of one or more sets.

[0225] (Hardware Configuration) Note that the block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining software with the single device or the multiple devices.

[0226] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As described above, the implementation method of each is not particularly limited.

[0227] For example, a base station, a user terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 14 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0228] In the present disclosure, the terms apparatus, circuit, device, section, unit, etc. may be used interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0229] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, serially, or in other ways. Furthermore, processor 1001 may be implemented by one or more chips.

[0230] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading specified software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0231] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transceiver unit 120 (220), etc. may be realized by the processor 1001.

[0232] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be implemented in a similar manner.

[0233] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EEPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, cache, main memory, etc. The memory 1002 may store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

[0234] Storage 1003 is a computer-readable recording medium and may be composed of at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0235] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0236] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0237] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0238] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using this hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0239] In addition, the devices included in the core network 30 (for example, network nodes that provide NF) may also be realized by the above-mentioned functional block / hardware configuration.

[0240] (Modifications) Note that terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0241] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0242] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate at least one of, for example, Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, specific filtering performed by a transceiver in the frequency domain, and specific windowing performed by a transceiver in the time domain.

[0243] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may also be a time unit based on numerology.

[0244] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0245] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may be referred to by other names corresponding to the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be interchangeable.

[0246] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0247] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0248] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0249] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0250] A TTI having a time length of 1 ms may be called a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0251] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and greater than or equal to 1 ms.

[0252] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may be determined based on numerology.

[0253] In addition, an RB may include one or more symbols in the time domain and may have a length of one slot, one minislot, one subframe, or one TTI, each of which may be composed of one or more resource blocks.

[0254] In addition, one or more RBs may 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.

[0255] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0256] A Bandwidth Part (BWP), which may also be referred to as a partial bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a Common Reference Point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0257] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0258] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0259] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0260] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0261] The names used for parameters and the like in this disclosure are not intended to be limiting in any way. Furthermore, the mathematical expressions and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0262] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0263] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via multiple network nodes.

[0264] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0265] With respect to any information (e.g., variables, constants, parameters) described in the present disclosure, even if not specifically stated in the above embodiments, any first device (e.g., UE / base station) may notify any second device (e.g., base station / UE) of information indicating / specifying (or relating to) the value of the any information.

[0266] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0267] Note that the physical layer signaling may be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be referred to as an RRC message, such as an RRC Connection Setup message or an RRC Connection Reconfiguration message. Furthermore, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0268] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0269] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value represented by true or false, or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0270] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0271] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), these wired and / or wireless technologies are included within the definition of transmission media.

[0272] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0273] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "layer," "number of layers," "rank," "resource," "resource set," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," "UE panel," "transmitting entity," "receiving entity," etc. may be used interchangeably.

[0274] In the present disclosure, the term "antenna port" may be interchangeably read as an antenna port for any signal / channel (e.g., a demodulation reference signal (DMRS) port). In the present disclosure, the term "resource" may be interchangeably read as a resource for any signal / channel (e.g., a reference signal resource, an SRS resource, etc.). The resource may include time / frequency / code / space / power resources. Furthermore, the spatial domain transmission filter may include at least one of a spatial domain transmission filter and a spatial domain reception filter.

[0275] The group may include, for example, at least one of a spatial relationship group, a Code Division Multiplexing (CDM) group, a Reference Signal (RS) group, a Control Resource Set (CORESET) group, a PUCCH group, an antenna port group (e.g., a DMRS port group), a layer group, a resource group, a beam group, an antenna group, a panel group, and the like.

[0276] In addition, in the present disclosure, beam, SRS Resource Indicator (SRI), CORESET, CORESET pool, PDSCH, PUSCH, codeword (CW), transport block (TB), RS, etc. may be read as interchangeable terms.

[0277] In addition, in the present disclosure, the terms TCI state, downlink TCI state (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, joint TCI state, etc. may be read interchangeably.

[0278] Furthermore, in the present disclosure, terms such as "QCL," "QCL assumption," "QCL relationship," "QCL type information," "QCL property / properties," "specific QCL type (e.g., Type A, Type D) property," and "specific QCL type (e.g., Type A, Type D)" may be interchangeable.

[0279] In the present disclosure, terms such as index, identifier (ID), indicator, indication, and resource ID may be interchangeable. In the present disclosure, terms such as sequence, list, set, group, cluster, and subset may be interchangeable.

[0280] Furthermore, the spatial relationship information identifier (ID) (TCI state ID) and the spatial relationship information (TCI state) may be interchangeable. The "spatial relationship information (TCI state)" may be interchangeable with "set of spatial relationship information (TCI state)", "one or more pieces of spatial relationship information", etc. The TCI state and the TCI may be interchangeable. The spatial relationship information and the spatial relationship may be interchangeable.

[0281] 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," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0282] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication service within that coverage.

[0283] In the present disclosure, a base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control / operate based on the information.

[0284] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0285] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0286] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.

[0287] The mobile body is a movable object that can move at any speed and naturally includes cases where the mobile body is stationary. Examples of the mobile body include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and objects mounted thereon. The mobile body may also be a mobile body that moves autonomously based on an operation command.

[0288] The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Note that at least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0289] 15 is a diagram showing an example of a vehicle according to an embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, an electronic control unit 49, various sensors (including a current sensor 50, an RPM 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.

[0290] The drive unit 41 is configured with at least one of an engine, a motor, and a hybrid of an engine and a motor, for example. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by a user.

[0291] The electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (for example, an input / output (IO) port) 63. Signals are input to the electronic control unit 49 from various sensors 50-58 provided in the vehicle. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0292] The signals from the various sensors 50-58 include a current signal from a current sensor 50 that senses the current of the motor, a rotation speed signal of the front wheels 46 / rear wheels 47 obtained by a rotation speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of the shift lever 45 obtained by a shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58.

[0293] The information service unit 59 is composed of various devices, such as a car navigation system, an audio system, speakers, a display, a television, and a radio, for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 59 uses information acquired from external devices via the communication module 60 or the like to provide various information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0294] The information service unit 59 may include input devices (e.g., keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) that accept input from the outside, and may also include output devices (e.g., displays, speakers, LED lamps, touch panels, etc.) that output to the outside.

[0295] The driving assistance system unit 64 includes various devices for providing functions to prevent accidents and reduce the driver's driving burden, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Units (IMUs), Inertial Navigation Systems (INSs)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driving assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driving assistance functions or autonomous driving functions.

[0296] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) via the communication port 63 to and from the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58, which are provided in the vehicle 40.

[0297] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the base station 10 or the user terminal 20 described above. Furthermore, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 described above (or may function as at least one of the base station 10 and the user terminal 20).

[0298] The communication module 60 may transmit at least one of signals from the above-mentioned various sensors 50-58 input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above-mentioned input.

[0299] The communication module 60 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from an external device and displays it on an information service unit 59 provided in the vehicle. The information service unit 59 may also be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0300] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, various sensors 50-58, and the like provided in the vehicle 40.

[0301] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, terms such as an uplink channel and a downlink channel may be read as a sidelink channel.

[0302] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0303] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc.), or a combination thereof.

[0304] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0305] Each aspect / embodiment described in the present disclosure may be a technology other than Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (x is, for example, an integer or decimal number)), 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 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802. The present invention may be applied to systems that use IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable wireless communication methods, or to next-generation systems that are expanded, modified, created, or defined based on these. Furthermore, the present invention may be applied to a combination of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0306] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0307] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0308] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, etc.

[0309] Additionally, "determining" may be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0310] Furthermore, "determination" may be considered to be "determining" resolving, selecting, choosing, establishing, comparing, etc. In other words, "determination" may be considered to be "determining" some kind of action. In the present disclosure, "determination" may be read interchangeably with the above-mentioned actions.

[0311] Furthermore, in this disclosure, "determine / determining" may be interchangeably read as "assume / assuming," "expect / expecting," "consider / considering," etc. Furthermore, in this disclosure, "does not expect to do..." may be interchangeably read as "assumes not to do...."

[0312] In the present disclosure, "expect" may be interchangeably read as "be expected." For example, "expect(s) ..." ("..." may be expressed, for example, as a that clause, a to-infinitive, etc.) may be interchangeably read as "be expected ..." or "do ... (if the above "..." is a to-infinitive, a verb with "to")," etc. "does not expect ..." may be interchangeably read as "be not expected ..." or "does not ... (if the above "..." is a to-infinitive, a verb with "to")," etc. Furthermore, "An apparatus A is not expected ..." may be interchangeably read as "an apparatus B other than apparatus A does not expect ... from apparatus A" (for example, if apparatus A is a UE, apparatus B may be a base station).

[0313] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0314] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0315] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, etc., as some non-limiting and non-exhaustive examples.

[0316] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0317] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0318] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0319] In the present disclosure, terms such as "less than or equal to," "less than," "greater than," "more than," "equal to," etc. may be interchangeable. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative, as expressions with "i-th" (i is an arbitrary integer) attached (for example, "highest" may be interchangeable with "i-th highest").

[0320] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

[0321] In the present disclosure, terms such as "when A, B," "if A, (then) B," "B upon A," "B in response to A," "B based on A," "B during / while A," "B before A," "B at (the same time as) / on A," "B after A," "B since A," and "B until A" may be interchangeable. Note that A, B, and the like herein may be replaced with appropriate expressions such as nouns, gerunds, and regular sentences, depending on the context. Note that the time difference between A and B may be approximately zero (immediately after or immediately before). A time offset may also be applied to the time at which A occurs. For example, "A" may be interchangeable with "before / after a time offset at which A occurs." The time offset (eg, one or more symbols / slots) may be predefined or may be specified by the UE based on signaled information.

[0322] In the present disclosure, timing, time, duration, time instance, any time unit (e.g., slot, subslot, symbol, subframe), period, occasion, resource, etc. may be read interchangeably.

[0323] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The description of the present disclosure is for illustrative purposes only and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. A terminal having a receiving unit that receives settings of the number N of repetitions of a random access preamble and a mask index, and a control unit that determines a set of N occasions respectively corresponding to the N repetitions based on the mask index.

2. The terminal according to claim 1, wherein the control unit determines the set from a plurality of occasions indicated by the mask index.

3. The terminal according to claim 1, wherein the control unit determines one or more candidates for the set and determines the set from the one or more candidates based on the mask index.

4. The terminal according to claim 1, wherein the mask index corresponds to one or more indexes of one or more sets.

5. A wireless communication method for a terminal, comprising a step of receiving settings of the number N of repetitions of a random access preamble and a mask index, and a step of determining a set of N occasions respectively corresponding to the N repetitions based on the mask index.

6. A base station having a transmitting unit that transmits settings of the number N of repetitions of a random access preamble and a mask index, and a control unit that determines a set of N occasions respectively corresponding to the N repetitions based on the mask index.

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