Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure is provided with: a reception unit that receives information pertaining to a random access procedure including a plurality of repetitions of a message 1 and a plurality of repetitions of a message 3; and a control unit that determines, on the basis of the information and on the basis of the one or more first beams used in the plurality of repetitions of the message 1, one or more second beams used in the plurality of repetitions of the message 3. According to one mode of the invention, the coverage range of the random access process can be improved.

Description

Technical Field

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

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

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

[0004] Prior art literature

[0005] Non-patent literature

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

[0007] Problems to be solved by the invention

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

[0009] However, the random access procedure for coverage improvement is not clear. If such a random access procedure is not clear, there is a concern that communication throughput may decrease.

[0010] Therefore, one of the objectives of the present disclosure is to provide a terminal, a wireless communication method, and a base station for improving the coverage of a random access procedure.

[0011] Means for solving problems

[0012] A terminal involved in one method of the present disclosure comprises: a receiving unit, which receives information related to a random access process including multiple repetitions of message 1 and multiple repetitions of message 3; and a control unit, which determines one or more second beams used in multiple repetitions of message 3 based on the information and based on one or more first beams used in multiple repetitions of message 1.

[0013] Effects of the Invention

[0014] According to one embodiment of the present disclosure, the coverage of the random access process can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1A as well as Figure 1B An example of multi-PRACH transmission is shown.

[0016] Figure 2 An example of the relationship between the PRACH mask index (mask index) and the permitted PRACH opportunity (RO) of the SSB is shown.

[0017] Figure 3 An example of the relationship between the value (code point) of 2MSB of the MCS information field and the number of iterations K is shown.

[0018] Figure 4A as well as Figure 4B An example of the relationship between Msg1 and Msg2 is shown.

[0019] Figure 5 An example of a RACH procedure for RSRP as a DL path loss reference according to Embodiment #1a-1 is shown.

[0020] Figure 6 An example of a RACH procedure for RSRP referenced by a DL path loss according to Example 1 of Embodiment #1a-2 is shown.

[0021] Figure 7 An example of a RACH procedure for RSRP referenced by a DL path loss according to Example 2 of Implementation #1a-2 is shown.

[0022] Figure 8An example of a RACH procedure for RSRP as a DL path loss reference according to Embodiment 1a-3 is shown.

[0023] Fig. 9A as well as Fig. 9B An example of application conditions involved in embodiment #1a-4 is shown.

[0024] Fig.10 An example of the RSRP threshold is shown.

[0025] Fig.11 An example of the transmission beam 1-1A is shown.

[0026] Fig.12 Another example of the transmission beam 1 - 1A is shown.

[0027] Fig.13 An example of the transmission beam 1-1B is shown.

[0028] Fig.14 A first example of transmission beam 1-2A is shown.

[0029] Fig.15 A second example of transmission beam 1-2A is shown.

[0030] Fig.16 A third example of transmission beam 1-2A is shown.

[0031] Fig.17 A fourth example of the transmission beam 1-2A is shown.

[0032] Fig.18 An example of the transmission beam 2-1A is shown.

[0033] Fig.19 Another example of the transmission beam 2-1A is shown.

[0034] Fig. 20 An example of the transmission beam 2-2A is shown.

[0035] Fig.21 Another example of the transmission beam 2-2A is shown.

[0036] FIG. 22A to FIG. 22C An example of candidate values ​​for the number of Msg3 repetitions is shown.

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

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

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

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

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

[0042] (TCI, spatial relationship, QCL)

[0043] In NR, research is underway 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) of at least one of a signal and a channel (expressed as signal / channel) in the UE based on the Transmission Configuration Indication state (TCI state).

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

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

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

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

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

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

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

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

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

[0053] The UE assumes that a certain Control Resource Set (CORESET), channel or reference signal is in a specific QCL (e.g., QCL type D) relationship with other CORESETs, channels or reference signals. This situation can also be called QCL assumption.

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

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

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

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

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

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

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

[0061] (Initial access process)

[0062] During the initial access process, the UE (RRC_IDLE mode) receives the SS / PBCH block (SSB), sends Msg.1 (PRACH / random access preamble / preamble), receives Msg.2 (PDCCH, PDSCH including random access response (RAR)), sends Msg.3 (PUSCH scheduled by RAR UL grant), and receives Msg.4 (PDCCH, PDSCH including UE contention resolution identity). Afterwards, if the UE sends an ACK for Msg.4 through the base station (network), the RRC connection is established (RRC_CONNECTED mode).

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

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

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

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

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

[0068] (Beam and Coverage)

[0069] In high frequency bands, if beamforming is not applied to the synchronization signal / reference signal, the coverage becomes narrow and it is difficult for the UE to find the base station. On the other hand, if beamforming is applied to the synchronization signal / reference signal to ensure coverage, a stronger signal arrives in a specific direction, but it is more difficult for the signal to arrive in other directions. In the base station before the UE is connected, if the direction in which the UE is located is set to be unknown, it is impossible to send the synchronization signal / reference signal using a beam that is only facing the appropriate direction. Consider the following method: the base station sends multiple synchronization signals / reference signals with beams in different directions, and the UE identifies which beam has been found. If a thin (narrow) beam is used for coverage, more synchronization signals / reference signals need to be sent, so there is a concern that overhead will increase and frequency utilization efficiency will decrease.

[0070] If a coarse (wide) beam is used to reduce the number of beams (synchronization signals / reference signals) to suppress overhead, the coverage becomes narrower.

[0071] In future wireless communication systems (for example, 6G), it is considered that the use of frequency bands such as millimeter waves and terahertz waves will be further developed. It is considered that a communication service can be provided by constructing the area / coverage of a cell by using a large number of thin beams.

[0072] Considering expanding the area using the existing FR2 and using a higher frequency band than the existing FR2, in order to achieve these, in addition to multi-TRP, reconfigurable intelligent surface (RIS), etc., it is also preferable to improve beam management.

[0073] Research is underway to enhance coverage including PRACH extension for frequency range (FR) 2. For example, PRACH repetition using the same beam or different beams is underway. This PRACH extension can also be applied to FR1.

[0074] PRACH extension can be applied to both short PRACH formats and other formats.

[0075] The common RACH configuration (RACH-ConfigCommon) may also include a general RACH configuration (rach-ConfigGeneric), a total number of RA preambles (totalNumberOfRA-Preambles), an SSB per RACH opportunity, and a contention-based (CB) preamble per SSB (ssb-perRACH-OccasionAndCB-PreamblesPerSSB). rach-ConfigGeneric may include a PRACH configuration index (prach-ConfigurationIndex), and message 1 FDM (msg1-FDM, the number of PRACH opportunities that are FDMed within a time instance). ssb-perRACH-OccasionAndCB-PreamblesPerSSB may also include the number of CB preambles per SSB that is 1 / 8 (one Eighth, one SSB associated with 8 RACH opportunities) relative to the number of SSBs per RACH opportunity.

[0076] For type 1 random access procedure (4-step random access procedure, messages 1 / 2 / 3 / 4), the UE may also be provided with the number N of SS / PBCH blocks associated with one PRACH opportunity and the number R of CB preambles per SS / PBCH block for each valid PRACH opportunity via ssb-perRACH-OccasionAndCB-PreamblesPerSSB.

[0077] For a type 1 random access procedure, or for a type 2 random access procedure with a configuration of a PRACH opportunity independent of the type 1 random access procedure (2-step random access procedure, message A / B), when N<1, one SS / PBCH block is mapped to 1 / N consecutive valid RACH opportunities, with R CB preambles with consecutive indices associated with the SS / PBCH block index per valid PRACH opportunity starting from preamble index 0. When N≥1, R CB preambles with consecutive indices associated with the SS / PBCH block index n (0≤n<-N-1) per valid PRACH opportunity starting from preamble index n·N_preamble^total / N. Here, 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 a PRACH opportunity setting independent of the type 1 random access procedure. N_preamble^total is a multiple of N.

[0078] The association period used to map SS / PBCH blocks to PRACH opportunities starting from frame 0 is the minimum value in the set determined by the PRACH setting period according to the relationship between the PRACH setting period and the association period (the number of PRACH setting periods) (the relationship specified in the specification), so that N_Tx^SSB SS / PBCH block indices are mapped to the PRACH opportunity at least once in the association period. Here, the UE obtains N_Tx^SSB according to the value of the SSB position in the burst (ssb-PositionsInBurst) in SIB1 or in the public service cell configuration (ServingCellConfigCommon). If there is a set of PRACH opportunities or PRACH preambles that are not mapped to N_Tx^SSB SS / PBCH block indices after an integer number of mapping cycles from SS / PBCH block indices to PRACH opportunities in the association period, then an SS / PBCH block index is not mapped to the set of PRACH opportunities or PRACH preambles. The associated pattern period includes one or more associated periods, and the pattern between the PRACH opportunity and the SS / PBCH block index is determined to be repeated at most every 160ms. If a PRACH opportunity that is not associated with the SS / PBCH block index exists after an integer number of associated periods, the PRACH opportunity is not used for PRACH.

[0079] For PRACH setting 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.

[0080] When ssb-perRACH-OccasionAndCB-PreamblesPerSSB for the association of PRACH opportunities (RACH opportunities (RO)) with beams (SSB / CSI-RS) represents oneHalf, n16 (N=1 / 2, R=16), and msg1-FDM is 4, 4 ROs are FDMed in one time instance, and one SSB is mapped to 2 ROs. Preamble indexes 0 to 15 are associated with 2 ROs, and preamble indexes 0 to 15 are associated with SS0B. In this way, when N<1, one SSB is mapped to multiple ROs. As a result, the capacity of the RO of each beam can be improved.

[0081] When ssb-perRACH-OccasionAndCB-PreamblesPerSSB represents n4, n16 (N=4, R=16), msg1-FDM is 4, and N_preamble^total is 64, 4 ROs are FDMed in one time instance, and 4 SSBs are mapped to one RO. One RO is associated with SSB0 to 3. Preamble indexes 0 to 15 are associated with SSB0, preamble indexes 15 to 31 are associated with SSB1, preamble indexes 32 to 47 are associated with SSB2, and preamble indexes 48 to 63 are associated with SSB3. In this way, the same RO is associated with different SS / PBCH block indexes, and different preambles use different SS / PBCH block indexes. The base station can distinguish the associated SS / PBCH block indexes based on the received PRACH.

[0082] The random access preamble can be sent only in the time resources specified in the random access configuration of the specification, depending 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-level 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 preamble format, x and y in n_f (frame number) mod x=y, the subframe number, the starting codeword, the number of PRACH time slots in the subframe, the number of time domain PRACH opportunities in the PRACH time slot N_t^RA,slot, and the PRACH duration N_dur^RA.

[0083] Depending on whether PRACH repetition can be applied to a scenario, the types of RACH processes triggered by different purposes are different. The type of RACH process may also be at least one of the following.

[0084] Contention-free random access (CFRA), PDCCH ordered RA (RA initiated by PDCCH command), CFRA for beam failure recovery (BFR), CFRA for system information (SI) request, CFRA for reconfiguration with sync, etc.

[0085] Contention-based random access (CBRA), RA triggered by MAC entity, RA triggered by RRC with event, CBRA for BFR, etc.

[0086] · 4-step RACH.

[0087] · 2-step RACH.

[0088] However, the settings / procedures of PRACH repetition are not clear. For example, it is not clear how the PRACH resources (e.g., repetition mode, number of repetitions) used for repetition are set, the UE operation of repetitive preamble transmission, the impact on counters / timers related to RACH, etc. If such settings / procedures are not clear, there is a concern that communication quality / communication throughput will deteriorate.

[0089] (RA response window)

[0090] RA Response Window (ra-ResponseWindow) is a time window for monitoring RA Response (RAR) (SpCell only). RA Contention Resolution Timer (ra-ContentionResolutionTimer) is a timer for RA contention resolution (SpCell only). Msg.B Response Window is a time window for monitoring RA Response (RAR) for 2-step RA type (SpCell only).

[0091] If the RA preamble is transmitted, the MAC entity performs the following operations 1 to 3 regardless of the possibility of the occurrence of a measurement gap.

[0092] [Operation 1]

[0093] When the MAC entity sends a non-contention RA preamble for a BFR request, the MAC entity performs the following operations 1-1 and 1-2.

[0094] [[Operation 1-1]] The MAC entity starts the ra-ResponseWindow set in the BFR setting (BeamFailureRecoveryConfig) in the first PDCCH timing after the end of the RA preamble transmission.

[0095] [[Operation 1-2]] During the operation of the ra-ResponseWindow, the MAC entity monitors PDCCH transmission in the search space indicated by the BFR search space ID (recoverySearchSpaceId) of the SpCell identified by the C-radio network temporary identifier (RNTI).

[0096] [Operation 2]

[0097] If this is not the case, the MAC entity performs the following operations 2-1 and 2-2.

[0098] [[Operation 2-1]] The MAC entity starts the ra-ResponseWindow set in the common RACH configuration (RACH-ConfigCommon) in the first PDCCH timing after the end of the RA preamble transmission.

[0099] [[Operation 2-2]] During the operation of the ra-ResponseWindow, the MAC entity monitors the PDCCH transmission of the SpCell for the RAR identified by the RA-RNTI.

[0100] [Operation 3]

[0101] When the ra-ResponseWindow set in BeamFailureRecoveryConfig expires and a PDCCH transmission on the search space indicated by recoverySearchSpaceId with C-RNTI as the destination is received on the serving cell that sent the preamble, or when the ra-ResponseWindow set in RACH-ConfigCommon expires and a RAR including RA preamble identifiers consistent with the sent preamble index (PREAMBLE_INDEX) is received, the MAC entity considers the RAR reception to have failed and increments the preamble transmission counter (PREAMBLE_TRANSMISSION_COUNTER) by 1.

[0102] The MAC entity may also stop the ra-ResponseWindow after successful reception of the RAR including the RA preamble identifiers that match the transmitted PREAMBLE_INDEX (and may also stop monitoring for the RAR).

[0103] There are two cases of PDCCH monitoring in the RA response window: the PDCCH used for the base station's response to BFR and the PDCCH used for RAR. The following contents can also be applied to both cases.

[0104] If the MSGA (Msg.A) preamble is sent, the MAC entity performs the following operations 4 to 6 regardless of the possibility of the occurrence of a measurement gap.

[0105] [Operation 4]

[0106] The MAC entity starts the Msg.B response window (msgB-ResponseWindow) in the PDCCH monitoring window specified in the specification.

[0107] The msgB-ResponseWindow may also start in the following symbol: the first symbol of the earliest CORESET for which the UE is configured to receive a PDCCH for a Type-1-PDCCH CSS set, which is at least one symbol after the last symbol of the PRACH opportunity corresponding to the PRACH transmission. The length of the msgB-ResponseWindow may also correspond to the SCS for the Type-1-PDCCH CSS set.

[0108] [Operation 5]

[0109] During the operation of msgB-ResponseWindow, the MAC entity monitors the PDCCH transmission of the SpCell for RAR identified by MSGB-RNTI.

[0110] [Operation 6]

[0111] In the case where the C-RNTI MAC CE is included in the MSGA, the MAC entity monitors the PDCCH transmission of the SpCell for the RAR identified by the C-RNTI during the operation of the msgB-ResponseWindow.

[0112] The RA-RNTI associated with the PRACH opportunity at which the RA preamble is transmitted is calculated as follows.

[0113] RA-RNTI=1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id

[0114] Here, s_id is the index of the first OFDM symbol of the PRACH opportunity (0≤s_id<14). t_id is the index of the first time slot of the PRACH opportunity within the system frame (0≤t_id<80). The subcarrier spacing (SCS) used to determine t_id is based on the value of μ. f_id is the index of the PRACH opportunity in the frequency domain (0≤f_id<8). ul_carrier_id is the UL carrier used for RA preamble transmission (0 for the normal uplink (NUL) carrier and 1 for the supplementary uplink (SUL) carrier). RA-RNTI is calculated according to the specification. RA-RNTI is the RNTI for 4-step RACH.

[0115] The MSGB-RNTI associated with the PRACH opportunity at which the RA preamble is transmitted is calculated as follows.

[0116] MSGB-RNTI = 1 + s_id + 14×t_id + 14×80×f_id + 14×80×8×ul_carrier_id + 14×80×8×2

[0117] Here, s_id is the index of the first OFDM symbol of the PRACH occasion (0 ≤ s_id < 14). t_id is the index of the first time slot of the PRACH occasion within a system frame (0 ≤ t_id < 80). The subcarrier spacing (SCS) used to determine t_id is based on the value of μ. f_id is the index of the PRACH occasion in the frequency domain (0 ≤ f_id < 8). ul_carrier_id is the UL carrier used for RA preamble transmission (0 for the normal uplink (NUL) carrier and 1 for the supplementary uplink (SUL) carrier). MSGB-RNTI is the RNTI for the two-step RACH.

[0118] (PDCCH command)

[0119] <DCI format for PDCCH command>

[0120] DCI format 1_0 includes an identifier field for the DCI format, a bit field that is always set to 1, and a frequency domain resource assignment field. When the cyclic redundancy check (CRC) of DCI format 1_0 is scrambled by C-RNTI and all bits in the frequency domain resource assignment field are 1, this DCI format 1_0 is used for the random access procedure started by a PDCCH command. The remaining fields are the random access preamble, UL / supplementary uplink (SUL) indicator, SS / PBCH index (SSB index), PRACH mask index, and reserved bits (12 bits).

[0121] <PRACH occasion>

[0122] In the case of PRACH transmission triggered by a PDCCH command, if the value of the random access preamble index field is not zero, the PRACH mask index field represents the PRACH occasion of the PRACH transmission where the PRACH occasion is associated with the SS / PBCH block index indicated by the SS / PBCH block index field of the PDCCH command.

[0123] In the case of PRACH transmission triggered by a higher layer (PRACH transmission not triggered by a PDCCH command), if an ssb-ResourceList is provided, the PRACH mask index is represented by ra-ssb-OccasionMaskIndex. This ra-ssb-OccasionMaskIndex represents the PRACH occasion for PRACH transmission in which the PRACH occasion is associated with the selected SS / PBCH block index.

[0124] PRACH occasions are continuously mapped to each corresponding SS / PBCH block index. The indexing of the PRACH occasions represented by the mask index value is reset for each mapping cycle of each SS / PBCH block index and consecutive PRACH occasions. The UE selects, in the first available mapping cycle, the PRACH occasion represented by the PRACH mask index value corresponding to the indicated SS / PBCH block index for PRACH transmission.

[0125] For the indicated preamble index, the order of the PRACH occasions is as follows.

[0126] · First, in ascending order of the frequency resource index for the PRACH occasions that are frequency-division multiplexed.

[0127] · Second, in ascending order of the time resource index for the PRACH occasions that are time-division multiplexed within the PRACH slot.

[0128] · Third, in ascending order of the index of the PRACH slot.

[0129] For PRACH transmission triggered in response to a request from a higher layer, if a csirs-ResourceList is provided, the value of ra-OccasionList represents a list of PRACH occasions for PRACH transmission, where the PRACH occasions are associated with the selected CSI-RS index represented by the csi-RS. The indexing of the PRACH occasions represented by ra-OccasionList is reset for each association mode period.

[0130] The value of the PRACH mask index value (msgA-SSB-SharedRO-MaskIndex) is associated with the allowed PRACH occasions of the SSB (the value of the PRACH occasion index).

[0131] <Random Access Procedure in MAC Entity>

[0132] The random access procedure starts via a PDCCH command, the MAC entity itself, or RRC for events conforming to the specification. Inside the MAC entity, there is only one ongoing random access procedure at any given time. The random access procedure for an SCell starts only via a PDCCH command associated with a ra-PreambleIndex different from 0b000000.

[0133] In the case where the random access procedure starts on the serving cell, the MAC entity performs the following operations.

[0134] · When the random access procedure starts via a PDCCH command and the ra-PreambleIndex explicitly provided via the PDCCH is not 0b000000, or when the random access procedure starts for accompanying a synchronization reconfiguration and the non-competitive random access resources of the 4-step RA type are explicitly provided via rach-ConfigDedicated for the BWP selected for the random access procedure, set RA_TYPE to 4-stepRA.

[0135] When the selected RA_TYPE is set to 4-stepRA, the MAC entity performs the following operations.

[0136] · When the ra-PreambleIndex is explicitly provided from the PDCCH and the ra-PreambleIndex is not 0b000000, set PREAMBLE_INDEX to the notified ra-PreambleIndex and select the SSB notified via the PDCCH.

[0137] · When the SSB is selected as described above, determine the next available PRACH occasion from the PRACH occasions corresponding to the SSBs permitted and selected by the restrictions given by ra-ssb-OccasionMaskIndex. (The MAC entity randomly selects a PRACH occasion with equal probability from consecutive PRACH occasions corresponding to the selected SSB according to the specification. When the MAC entity determines the next available PRACH occasion corresponding to the selected SSB, it may also consider the possibility of the occurrence of measurement gaps.)

[0138] <Time between PDCCH command reception and PRACH transmission>

[0139] In the case where the random access procedure is started by a PDCCH command, if requested by the higher layer, the UE transmits a PRACH within the selected PRACH occasion when the time between the last symbol of the PDCCH command 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] as described in the specification (time condition). Here, N_(T,2) is the duration of N_2 symbols corresponding to the PUSCH preparation time of UE processing capability 1. It is assumed that μ corresponds to the minimum SCS setting between the SCS setting of the PDCCH command and the SCS setting of the corresponding PRACH transmission. When the active UL BWP does not change, Δ_BWPSwitching = 0; otherwise, Δ_BWPSwitching is defined in the specification. In FR1, Δ_delay = 0.5 msec; in FR2, Δ_delay = 0.25 msec. T_switch is the handover gap duration defined in the specification.

[0140] <Conditions (validity conditions) for the validity / invalidity of PRACH occasions>

[0141] In paired spectrum (FDD) or SUL band, all PRACH occasions are valid. In unpaired spectrum (TDD), PRACH occasions may also follow the following Rules 1 and 2.

[0142] [Rule 1]

[0143] When the UE is not provided with tdd-UL-DL-ConfigurationCommon, if the PRACH occasion within the PRACH time slot does not start before the SS / PBCH block within the PRACH time slot but starts at least N_gap symbols after the symbol reception of the last SS / PBCH block, then this PRACH occasion is valid. Here, N_gap is specified in the specification. When channelAccessMode = semistatic is provided, it does not overlap with the set of consecutive symbols before the start of the next channel occupancy time when the UE does not transmit. The candidate SS / PBCH block index of the SS / PBCH block corresponds to the SS / PBCH block index provided by ssb-PositionsInBurst within SIB1 or within ServingCellConfigCommon.

[0144] [Regulation 2]

[0145] When the UE is provided with tdd-UL-DL-ConfigurationCommon, the PRACH opportunity within the PRACH slot is valid in the following cases.

[0146] The PRACH opportunity is within the UL symbol. Or,

[0147] ·The PRACH opportunity does not precede the SS / PBCH block in the PRACH timeslot, but starts at least N_gap symbols from the last DL symbol and at least N_gap symbols from the last SS / PBCH block symbol. Here, N_gap is specified in the specification. When channelAccessMode=semistatic is provided, the PRACH opportunity does not overlap with the set of consecutive symbols before the start of the next channel occupancy time in which no transmission can occur, as documented in the specification. The candidate SS / PBCH block index of the SS / PBCH block corresponds to the SS / PBCH block index provided by ssb-PositionsInBurst in SIB1 or in ServingCellConfigCommon, as documented in the specification.

[0148] (Step 4 in CBRA)

[0149] Step 4 (Msg4) of the RA procedure of Rel.16 NR follows the Step 4 operation below.

[0150] [Step 4 Operation]

[0151] In case no C-RNTI is provided to the UE, upon PUSCH transmission scheduled by RAR UL grant, the UE attempts detection of DCI format 1_0 scheduling PDSCH including UE contention resolution identity and accompanied by CRC scrambled by corresponding TCI-RNTI. In response to reception of PDSCH including UE contention resolution identity, the UE transmits HARQ-ACK information in PUCCH. PUCCH transmission is in the same active UL BWP as PUSCH transmission. The minimum time between the last symbol of PDSCH reception and the first symbol of corresponding PUCCH transmission including HARQ-ACK information is equal to N_T,1 [msec]. N_T,1 is the duration of N_T,1 symbols equivalent to PDSCH processing time of UE processing capability 1 with additional PDSCH DM-RS configured. For μ=0, the UE assumes N_T,1=14.

[0152] When the DCI format is detected based on a PUSCH transmission scheduled by an RAR UL grant, or based on a corresponding PUSCH retransmission scheduled by DCI format 0_0 with a CRC scrambled by the TC-RNTI provided in the corresponding RAR message, regardless of whether the TCI state corresponding to the CORESET of the PDCCH accompanied by the DCI format received by the UE is provided to the UE, the UE may also assume that the PDCCH carrying the DCI format is the same DM-RS antenna port quasi co-location (QCL) properties as the DM-RS antenna port QCL properties for the SS / PBCH blocks used by the UE for PRACH association.

[0153] (RAR receiving)

[0154] Based on the PRACH transmission, the UE attempts detection of DCI format 1_0 with CRC scrambled by the corresponding RA-RNTI in a window controlled by the aforementioned higher layers. The window starts in the first symbol of the earliest CORESET for which the UE is configured to receive PDCCH for the type-1-PDCCH CSS set, i.e., at least one symbol after the last symbol of the PRACH opportunity corresponding to the PRACH transmission. The symbol period corresponds to the SCS for the type-1-PDCCH CSS set. The length of the window is based on the SCS for the type-1-PDCCH CSS set, provided by ra-responseWindow as a number of slots.

[0155] When the UE detects DCI format 1_0 with a CRC scrambled by the corresponding RA-RNTI and the LSB of the SFN field within the DCI format that is the same as the least significant bits (LSB) of the system frame number (SFN) of the PRACH sent by the UE, and the UE receives a transport block within the corresponding PDSCH, the UE may also assume the same DMRS antenna port QCL properties with respect to the associated SS / PBCH blocks or CSI-RS resources used by the UE for PRACH, regardless of whether the UE is provided with a TCI-State for the CORESET receiving the PDCCH accompanying the DCI format 1_0.

[0156] In the case where the UE attempts to detect a DCI format 1_0 with a CRC scrambled by the corresponding RA-RNTI according to a PRACH transmission started by a PDCCH order that triggers a CFRA procedure for the SpCell, the UE may also assume that the PDCCH including the DCI format 1_0 and the PDCCH order have the same DMRS antenna port QCL properties. In the case where the UE attempts to detect a DCI format 1_0 with a CRC scrambled by the corresponding RA-RNTI according to a PRACH transmission started by a PDCCH order that triggers a CFRA procedure for the secondary cell, the UE may also assume that the DMRS antenna port QCL properties of the CORESET associated with the type 1-PDCCH CSS set used to receive the PDCCH including the DCI format 1_0.

[0157] The RAR UL grant may also include at least one of a frequency hopping flag field, a PUSCH frequency resource allocation field, a PUSCH time resource allocation field, a modulation and coding scheme (MCS) field, a PUSCH TPC command field, a CSI request field, and a channel access-cyclic prefix extension (CPext) field.

[0158] (Uplink coverage improvement of PRACH)

[0159] The following two cases / types of multiple PRACH transmissions are being studied.

[0160] [Case 1 / Type 1 Multiple PRACH Transmission]

[0161] The UE repeatedly transmits Msg1 on n random access opportunities (RO) / RO resources. After that, the UE waits for detection of Msg2 in the set type 1 PDCCH opportunity. In the present disclosure, the repeated transmission of preambles in n ROs / RO resources is sometimes referred to as an RO group. Figure 1A An example of the timing of type 1 multi-PRACH transmission is shown. In this example, the size of the RO group (the number of ROs in the RO group) is n. After one RO group, one RAR window starts.

[0162] [Case 2 / Type 2 Multiple PRACH Transmission]

[0163] The UE repeatedly transmits Msg1 on n random access opportunity (RO) resources. After transmitting Msg1 on each RO, the UE waits for the detection of Msg2 in a type 1 PDCCH opportunity. Figure 1B An example of the timing of type 2 multi-PRACH transmission is shown. In this example, the size of the RO group (the number of ROs in the RO group) is n. After each RO, a RAR window starts.

[0164] (Rel.17 Msg3 repeated)

[0165] The UE decides whether to apply Msg3 repetition based on RSRP. When Msg repetition is set and the RSRP referenced by the DL path loss is less than rsrp-ThresholdMsg3 (threshold), the MAC entity assumes that Msg3 repetition can be applied in the current random access (RA) procedure.

[0166] The UE can request Msg3 PUSCH repetition via a dedicated PRACH resource. In the case where more than one set of available RA resources exists and one of the more than one set is used for an indication of all functions of the RA process to be triggered, and in the case where more than one set of available RA resources exists for an indication of a subset of all functions of the RA process to be triggered, the MAC entity selects the RA resource. In the case where the Msg3 repetition indication is set for a set of RA resources, if the Msg3 repetition cannot be used, the MAC entity regards the set of RA resources as unavailable for the RACH process.

[0167] RA resources may also be partitioned for each function. The function may also include at least one of Msg3 repetition, reduced capacity (RedCap), small data transmission (SDT), and RAN slicing.

[0168] In SIB1 transmitted by the base station, the following contents are notified.

[0169] Priority of each feature (featurePriorities-r17). This priority is used to determine which FeatureCombinationPreambles the UE uses when a feature is mapped to more than one FeatureCombinationPreambles.

[0170] ·Additional RO settings: This setting includes available functions (which may be associated with multiple functions), RA resources (eg, preamble index), and mask index for distinguishing ROs.

[0171] The UE decides the RO to use depending on this function.

[0172] SIB1 includes ServingCellConfigCommonSIB, which includes UplinkConfigCommonSIB, which includes BWP-UplinkCommon (UL BWP common settings).

[0173] BWP-UplinkCommon may also include RACH common configuration (RACH-ConfigCommon or MsgA-ConfigCommon), additionalRACH-ConfigList-r17 (additional RACH configuration list), and additionalRACH-ConfigList-r17 may also include rsrp-ThresholdMsg3-r17 (threshold value).

[0174] RACH common settings may also include FeatureCombinationPreambles. FeatureCombinationPreambles associates a set of preambles (partitions) with a feature combination. FeatureCombinationPreambles may also include FeatureCombination (feature combination settings), startPreambleForThisPartition (index of the initial preamble), numberOfPreamblesPerSSB-ForThisPartition (number of preambles), ssb-SharedRO-MaskIndex-r17 (PRACH mask index). FeatureCombination includes at least one of redCap (RedCap), smallData (SDT), sliceGroup (RAN slicing), and msg3-Repetition (Msg3 repetition). The partition is given by the index of the initial preamble and the number of preambles.

[0175] The available RO is explicitly set by the PRACH mask index. Figure 2 An example of the relationship between the PRACH mask index and the permitted PRACH opportunity (RO) of the SSB (MAC protocol specification / PRACH mask index value table) is shown. At least one of the PRACH opportunity indices 1 to 8 can be set.

[0176] The number of Msg3 repetitions is indicated by the 2 most significant bits (MSB) (upper 2 bits) of the modulation and coding scheme (MCS) field in the RAR UL grant.

[0177] Figure 3 An example of the relationship between the value (code point) of the 2MSB of the MCS information field and the number of repetitions K is shown in the table. In PUSCH repetition type A, when a PUSCH scheduled by an RAR UL grant is transmitted, the 2MSB of the MCS information field of the RAR UL grant is set according to whether the higher layer parameter numberOfMsg3Repetitions is set. Figure 3 The table provides code points used to determine the number of iterations K. The number of time slots N used to determine the transport block size (TBS) is equal to 1.

[0178] In PUSCH repetition type B, when a PUSCH scheduled by DCI format 0_0 with a CRC scrambled by TC-RNTI is transmitted, the 2MSBs of the MCS information field of the DCI format are set according to whether the higher layer parameter numberOfMsg3Repetitions is set. Figure 3 The table provides the code points used to determine the number of iterations K. The number of time slots N used for TBS determination is equal to 1.

[0179] The following issues are being considered: introducing the UE capability of Msg3 repetition in Rel.17 and introducing the UE capability of Msg3 repetition in Rel.18.

[0180] [Question 1]

[0181] Whether the UE reports these two capabilities, whether there is a relationship between these capabilities, and whether the two functions of Msg1 repetition and Msg3 repetition are operated together when the UE has these two capabilities have become issues.

[0182] [Question 2]

[0183] When these two functions are operated together, whether there is an impact on the existing Msg3 repetition operation becomes a problem. For example, the beam of Msg3 repetition, the number of Msg3 repetitions, the relationship between Msg3 repetitions for each Msg3 corresponding to each RAR, etc. are problems. Case 1, where one RAR is repeatedly sent for multiple Msg1s, and case 2, where multiple RARs are repeatedly sent for multiple Msg1s are being studied.

[0184] As described above, the operation related to the repetition of Msg1 / 3 is unclear. If such an operation is unclear, there is a possibility that the throughput may be reduced.

[0185] Therefore, the inventors of the present invention have conceived of repeated operations during the random access process.

[0186] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods according to the embodiments may be applied individually or in combination.

[0187] In the present disclosure, "A / B" and "at least one of A and B" may be replaced with each other. In addition, in the present disclosure, "A / B / C" may also mean "at least one of A, B, and C".

[0188] In the present disclosure, activate, deactivate, indicate (or specify), select, configure, update, determine, etc. may also be mutually rewritten. In the present disclosure, support, control, controllable, operate, and can operate may also be mutually rewritten.

[0189] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, high-layer parameters, information elements (IE), settings, etc. may also be overwritten with each other. In the present disclosure, Medium Access Control (MAC) control elements (MAC Control Element (CE)), update commands, activation / deactivation commands, etc. may also be overwritten with each other.

[0190] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0191] In the present disclosure, MAC signaling may also use, for example, MAC Control Element (MACCE), MAC Protocol Data Unit (MAC Protocol Data Unit (PDU)), etc. Broadcast information may also be, for example, Master Information Block (MIB), System Information Block (SIB), minimum system information (Remaining Minimum System Information (RMSI)), Other System Information (Other System Information (OSI)), etc.

[0192] In the present disclosure, the physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI)), etc.

[0193] In the present disclosure, index, identifier (ID), indicator, resource ID, etc. may also be mutually replaced. In the present disclosure, sequence, list, set (set), group, group, cluster, subset, etc. may also be mutually replaced.

[0194] In the present disclosure, panel, UE panel, panel group, beam, beam group, precoder, uplink (UL) transmission entity, transmission / reception point (Transmission / Reception Point (TRP)), base station, spatial relationship information (Spatial Relation Information (SRI)), spatial relationship, SRS resource indicator (SRSResource Indicator (SRI)), control resource set (COntrol REsource SET (CORESET)), physical downlink shared channel (Physical Downlink Shared Channel (PDSCH)), codeword (Codeword (CW)), transport block (Transport Block (TB)), reference signal (Reference Signal (RS)), antenna port (e.g., demodulation reference signal (DeModulation Reference Signal (DMRS)) port), antenna port group (e.g., DMRS port group), group (e.g., spatial relationship group, code division multiplexing (Code Division Multiplexing (CDM)) group, reference signal group, CORESET group, physical uplink control channel (Physical Uplink Shared Channel (PDSCH)), codeword (Codeword (CW)), transport block (Transport Block (TB)), reference signal (Reference Signal (RS)), antenna port (e.g., demodulation reference signal (DeModulation Reference Signal (DMRS)) port), antenna port group (e.g., DMRS port group), group (e.g., spatial relationship group, code division multiplexing (Code Division Multiplexing (CDM)) group, reference signal group, CORESET group, physical uplink control channel (Physical Uplink Shared Channel (PDSCH)), Uplink Control Channel (PUCCH)) group, PUCCH resource group), resources (for example, reference signal resources, SRS resources), resource sets (for example, reference signal resource sets), CORESET pool, downlink transmission configuration indication state (Transmission Configuration Indicationstate (TCI state)) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, Quasi-Co-Location (QCL)), QCL assumptions, etc. can also be rewritten with each other.

[0195] In the present disclosure, the SSB / CSI-RS index / indicator, beam index, and TCI status can also be overwritten with each other.

[0196] (Wireless Communication Method)

[0197] In each embodiment, RACH resources, RA resources, PRACH preamble, timing, RACH timing (RO), PRACH timing, repetition resources, repetition setting resources, resources set for RO / repetition, time instance and frequency instance, time resources and frequency resources, RO / preamble resources, and repetition may also be mutually replaced. In each embodiment, period, cycle, frame, subframe, time slot, codeword, timing, and RO may also be mutually replaced.

[0198] In each embodiment, the PDCCH command, PDCCH command DCI, DCI format 1_0, and message (Msg) 0 may also be overwritten with each other. In each embodiment, PRACH, preamble, PRACH preamble, sequence, preamble format, and Msg1 may also be overwritten with each other. In each embodiment, the response to PRACH, RAR, Msg2, MsgB, Msg4, base station response to BFR, and DCI for scheduling response may also be overwritten with each other. In each embodiment, transmissions other than PRACH during random access, Msg3, PUSCH scheduled by RAR, HARQ-ACK / PUCCH for Msg4, and MsgA PUSCH may also be overwritten with each other. In each embodiment, Msg3, PUSCH scheduled by RAR UL grant, and RRC connection request may also be overwritten with each other. In each embodiment, Msg4, contention resolution, RRC connection setup, and PDSCH with UE contention resolution identity may be overwritten.

[0199] In each embodiment, beam, SSB, SSB index may also be overwritten with each other. In each embodiment, DL path loss reference, PL-RS, SSB, CSI-RS may also be overwritten with each other.

[0200] In each embodiment, a repetition period, a repetition configuration period, a repetition periodicity, and a repetition cycle may be rewritten.

[0201] In each embodiment, a random access (RA) procedure, CFRA / CBRA, 4-step RACH / 2-step RACH, a specific type of random access procedure, a random access procedure using a specific PRACH format, a random access procedure started by a PDCCH command, a random access procedure started without a PDCCH command, and a random access procedure started by a higher layer may also overwrite each other.

[0202] Each embodiment can also assume the following cases 1 and 2 (the above-mentioned cases 1 and 2).

[0203] [Scenario 1]

[0204] One RAR can also be sent for multiple repetitions of Msg1 ( Figure 4A ).

[0205] [Scenario 2]

[0206] One RAR may be sent for each of the multiple repetitions of Msg1 ( Figure 4B ).

[0207] <Implementation method #1>

[0208] The UE may also send first capability information related to the capability of repeating Msg1 and second capability information related to the capability of repeating Msg3. The UE may also decide whether to perform a first random access procedure including the repeating of Msg1 and the repeating of Msg3, or to perform a second random access procedure not including at least one of the repeating of Msg1 and the repeating of Msg3, based on the first capability information and the second capability information.

[0209] Implementation Method #1a

[0210] The present embodiment relates to whether or not the two functions of Msg1 repetition and Msg3 repetition are operated together.

[0211] 《Implementation Method #1a-1》

[0212] The joint operation of Msg1 repetition and Msg3 repetition may not be supported.

[0213] As the type of RACH resource, there may be at least one type among the following types.

[0214] One or more sets of RACH resources used for a RACH procedure that is not accompanied by either Msg1 repetition or Msg3 repetition.

[0215] One or more sets of RACH resources used for a RACH procedure that is accompanied by Msg3 repetition but not accompanied by Msg1 repetition.

[0216] One or more sets of RACH resources used for a RACH procedure that is accompanied by Msg1 repetitions but not accompanied by Msg3 repetitions.

[0217] The number of repetitions of Msg1 / Msg3 may be different between a plurality of sets of RACH resources used for a RACH procedure involving repetitions of Msg1 / Msg3.

[0218] [Example 1]

[0219] It may also be stipulated that: the UE is not assumed to simultaneously report the capability of repeating Msg1 and the capability of repeating Msg3.

[0220] [Example 2]

[0221] The UE that reports both the capability of Msg1 repetition and the capability of Msg3 repetition may also decide whether to perform only Msg1 repetition or only Msg3 repetition in one RACH process based on a certain condition. For example, the condition may also be a condition of RSRP of SSB. In this case, the UE may also follow at least one UE operation among the following several UE operations.

[0222] [UE operation 1]

[0223] When the RSRP of the selected SSB is within range 1, the UE determines that only Msg1 is to be applied repeatedly for the subsequent RACH process. For example, range 1 may also be at least one of the RSRP being less than threshold 1 and greater than threshold 2.

[0224] [UE operation 2]

[0225] When the RSRP of the selected SSB is within range 2, the UE determines that only Msg3 repetition is applied for the subsequent RACH process. For example, range 2 may also be at least one of the RSRP being less than threshold 3 and greater than threshold 4.

[0226] [UE operation 3]

[0227] When the RSRP of the selected SSB is within range 3, the UE determines that neither Msg1 repetition nor Msg3 repetition is applied to the subsequent RACH process. For example, range 3 may also be that the RSRP is greater than a threshold value 5.

[0228] Range 1 / 2 / 3 / Threshold 1 / 2 / 3 / 4 / 5 may be defined in the specification or indicated by the base station via PBCH / SIB1PDSCH / RRC IE.

[0229] Figure 5 An example of a RACH procedure for RSRP referenced to DL path loss according to Embodiment #1a-1 is shown. When RSRP is equal to or greater than rsrp-ThresholdMsgA, a UE having 2-step RACH capability of Rel.16 applies 2-step RACH.

[0230] A UE capable of 2-step RACH of Rel.16 applies 4-step RACH when RSRP is lower than rsrp-ThresholdMsgA. RA resources for 2-step RACH and 4-step RACH can also be selected from pool #1.

[0231] A UE capable of Msg3 repetition of Rel.17 applies 4-step RACH without Msg3 repetition when RSRP is above the threshold rsrp-ThresholdMsg3, and applies 4-step RACH with Msg3 repetition when RSRP is below the threshold rsrp-ThresholdMsg3. RA resources for 2-step RACH and 4-step RACH without Msg3 repetition can also be selected from pool #1. RA resources for 4-step RACH with Msg3 repetition can also be selected from pool #2.

[0232] A UE capable of Msg1 repetition of Rel.18 may also apply 4-step RACH without Msg1 repetition when RSRP is above the threshold rsrp-ThresholdMsg1, and may apply 4-step RACH with Msg1 repetition when RSRP is below the threshold rsrp-ThresholdMsg1. RA resources for 2-step RACH and 4-step RACH without Msg1 repetition may also be selected from pool #1. RA resources for 4-step RACH with Msg1 repetition may also be selected from pool #3.

[0233] A UE supporting Msg1 repetition and Msg3 repetition may also apply 2-step RACH when RSRP is greater than rsrp-ThresholdMsgA. When RSRP is less than rsrp-ThresholdMsgA and greater than the threshold rsrp-ThresholdMsg3, the UE may also apply 4-step RACH without either Msg1 repetition or Msg3 repetition. When RSRP is less than the threshold rsrp-ThresholdMsg3 and greater than the threshold rsrp-ThresholdMsg1, the UE may also apply 4-step RACH with Msg3 repetition but not Msg1 repetition. When RSRP is less than the threshold rsrp-ThresholdMsg1, the UE may also apply 4-step RACH with Msg1 repetition but not Msg3 repetition. RA resources for 2-step RACH and 4-step RACH without Msg1 repetition and Msg3 repetition may also be selected from pool #1. RA resources for 4-step RACH with Msg3 repetition but not Msg1 repetition may also be selected from pool #2. RA resources for 4-step RACH with Msg1 repetition but not Msg3 repetition may also be selected from pool #3.

[0234] 《Implementation Method #1a-2》

[0235] It can also support the joint operation of Msg1 repetition and Msg3 repetition.

[0236] As the type of RACH resource, there may be at least one type among the following types.

[0237] One or more sets of RACH resources used for a RACH procedure that is not accompanied by either Msg1 repetition or Msg3 repetition.

[0238] One or more sets of RACH resources used for a RACH procedure that is accompanied by Msg3 repetition but not accompanied by Msg1 repetition.

[0239] One or more sets of RACH resources used for a RACH procedure that is accompanied by Msg1 repetitions but not accompanied by Msg3 repetitions.

[0240] One or more sets of RACH resources used for RACH procedures involving both Msg1 repetition and Msg3 repetition.

[0241] The number of repetitions of Msg1 / Msg3 may be different between a plurality of sets of RACH resources used for a RACH procedure involving repetitions of Msg1 / Msg3.

[0242] In the case where the UE reports both the capability of Msg1 repetition and the capability of Msg3 repetition, the UE operation may also be based on a certain condition, for example, the condition may also be the RSRP condition of SSB.

[0243] [Example 1]

[0244] Alternatively, at least one of the following UE operations may be applied to the repetition of Msg1 / Msg3. Each UE operation may correspond to the range of SSB RSRP.

[0245] [[UE operation 1]]

[0246] In the subsequent RACH process, neither Msg1 repetition nor Msg3 repetition is applied. The condition may be that SSBRSRP is at least one of above threshold 1 and below threshold 2. Threshold 1 may also be rsrp-Threshold-NoRep.

[0247] [[UE operation 2]]

[0248] In the subsequent RACH process, only Msg3 is applied repeatedly. The condition may also be that the SSB RSRP is at least one of above threshold 3 and below threshold 4. Threshold 3 may also be rsrp-Threshold-NoRep. Threshold 4 may also be rsrp-ThresholdMsg3.

[0249] [[UE operation 3]]

[0250] In the subsequent RACH procedure, both Msg1 repetition and Msg3 repetition are applied. The condition may be at least one of SSBRSRP being greater than or equal to threshold 5 and less than or equal to threshold 6. Threshold 6 may also be rsrp-ThresholdMsg1.

[0251] Thresholds 1 / 2 / 3 / 4 / 5 / 6 may be defined in the specification or indicated by the base station via PBCH / SIB1 PDSCH / RRC IE.

[0252] [Example 2]

[0253] Alternatively, at least one of the following UE operations may be applied to the repetition of Msg1 / Msg3. Each UE operation may correspond to the range of SSB RSRP.

[0254] [[UE operation 1]]

[0255] In the subsequent RACH process, neither Msg1 repetition nor Msg3 repetition is applied. The condition may be that SSBRSRP is at least one of above threshold 1 and below threshold 2. Threshold 1 may also be rsrp-ThresholdMsg3.

[0256] [[UE operation 2]]

[0257] In the subsequent RACH process, only Msg3 is repeatedly applied. The condition may also be that the SSB RSRP is at least one of a threshold value 5 or above and a threshold value 6 or below. Threshold value 5 may also be rsrp-ThresholdMsg1. Threshold value 6 may also be rsrp-ThresholdMsg3.

[0258] [[UE operation 3]]

[0259] In the subsequent RACH process, only Msg1 is repeatedly applied. The condition may also be that the SSB RSRP is at least one of a threshold value 3 or above and a threshold value 4 or below. Threshold value 3 may also be rsrp-ThresholdMsg3. Threshold value 4 may also be rsrp-ThresholdMsg1.

[0260] [[UE operation 4]]

[0261] In the subsequent RACH procedure, both Msg1 repetition and Msg3 repetition are applied. The condition may be at least one of SSBRSRP being greater than or equal to threshold 7 and less than or equal to threshold 8. Threshold 8 may be rsrp-ThresholdMsg1Msg3.

[0262] Thresholds 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 may be defined in the specification or indicated by the base station via PBCH / SIB1 PDSCH / RRCIE.

[0263] According to the coverage evaluation results in Rel.17 coverage enhancement (CovEnh), Msg3 becomes a bottleneck compared to Msg1. Therefore, when Msg1 needs to be repeated, it is preferred that Msg3 also needs to be repeated. Therefore, compared with Example 2, Example 1 is more preferred.

[0264] Figure 6 An example of the RACH process for RSRP with reference to DL path loss involved in Example 1 of Implementation #1a-2 is shown. For UEs capable of 2-step RACH of Rel.16, UEs capable of Msg3 repetition of Rel.17, and UEs capable of Msg1 repetition of Rel.18, the operations are the same as those described in Implementation #1a-1.

[0265] A UE supporting Msg1 repetition and Msg3 repetition may also apply 2-step RACH when RSRP is greater than rsrp-ThresholdMsgA. When RSRP is less than rsrp-ThresholdMsgA and greater than the threshold rsrp-ThresholdMsg3, the UE may also apply 4-step RACH without either Msg1 repetition or Msg3 repetition. When RSRP is less than the threshold rsrp-ThresholdMsg3 and greater than the threshold rsrp-ThresholdMsg1, the UE may also apply 4-step RACH with Msg3 repetition but without Msg1 repetition. When RSRP is less than the threshold rsrp-ThresholdMsg1, the UE may also apply 4-step RACH with Msg1 repetition and Msg3 repetition. RA resources for 2-step RACH and 4-step RACH without Msg1 repetition and Msg3 repetition may also be selected from pool #1. RA resources for 4-step RACH with Msg3 repetition but not Msg1 repetition may be selected from pool #2. RA resources for 4-step RACH with Msg1 repetition and Msg3 repetition may be selected from pool #3.

[0266] Figure 7 An example of the RACH process for RSRP with reference to DL path loss according to Example 2 of Implementation #1a-2 is shown. For UEs capable of 2-step RACH of Rel.16, UEs capable of Msg3 repetition of Rel.17, and UEs capable of Msg1 repetition of Rel.18, the operation is the same as that described in Implementation #1a-1.

[0267] A UE supporting Msg1 repetition and Msg3 repetition may also apply 2-step RACH when RSRP is above rsrp-ThresholdMsgA. When RSRP is lower than rsrp-ThresholdMsgA and is above the threshold rsrp-ThresholdMsg3, the UE may also apply 4-step RACH with neither Msg1 repetition nor Msg3 repetition. When RSRP is lower than the threshold rsrp-ThresholdMsg3 and is above the threshold rsrp-ThresholdMsg1, the UE may also apply 4-step RACH with Msg3 repetition but not Msg1 repetition. When RSRP is lower than the threshold rsrp-ThresholdMsg1 and is above the threshold rsrp-ThresholdMsg1Msg3, the UE may also apply 4-step RACH with Msg1 repetition but not Msg3 repetition. When RSRP is lower than the threshold rsrp-ThresholdMsg1Msg3, the UE may also apply 4-step RACH with Msg1 repetition and Msg3 repetition. RA resources for 2-step RACH and 4-step RACH without Msg1 repetition and Msg3 repetition may also be selected from pool #1. RA resources for 4-step RACH with Msg3 repetition but not Msg1 repetition may also be selected from pool #2. RA resources for 4-step RACH with Msg1 repetition but not Msg3 repetition may also be selected from pool #3. RA resources for 4-step RACH with Msg1 repetition and Msg3 repetition may also be selected from pool #4.

[0268] Implementation Method #1a-3

[0269] It is also possible to support a joint operation of Msg1 repetition and Msg3 repetition, and the ability to repetition Msg3 is a prerequisite ability (necessary condition) for the ability to repetition Msg1.

[0270] A UE that reports the capability of Msg1 repetition may also be specified as having the capability of Msg3 repetition.

[0271] As the type of RACH resource, there may be at least one type among the following types.

[0272] One or more sets of RACH resources used for a RACH procedure that is not accompanied by either Msg1 repetition or Msg3 repetition.

[0273] One or more sets of RACH resources used for a RACH procedure that is accompanied by Msg3 repetition but not accompanied by Msg1 repetition.

[0274] One or more sets of RACH resources used for RACH procedures involving both Msg1 repetition and Msg3 repetition.

[0275] The number of repetitions of Msg1 / Msg3 may be different between a plurality of sets of RACH resources used for a RACH procedure involving repetitions of Msg1 / Msg3.

[0276] In the case where the UE reports both the capability of Msg1 repetition and the capability of Msg3 repetition, the UE operation may also be based on a certain condition, for example, the condition may also be the RSRP condition of SSB.

[0277] Alternatively, at least one of the following UE operations may be applied to the repetition of Msg1 / Msg3. Each UE operation may correspond to the range of SSB RSRP.

[0278] [[UE operation 1]]

[0279] In the subsequent RACH process, neither Msg1 repetition nor Msg3 repetition is applied. The condition may be that SSBRSRP is at least one of above threshold 1 and below threshold 2. Threshold 1 may also be rsrp-Threshold-NoRep.

[0280] [[UE operation 2]]

[0281] In the subsequent RACH process, only Msg3 is applied repeatedly. The condition may also be that the SSB RSRP is at least one of above threshold 3 and below threshold 4. Threshold 3 may also be rsrp-Threshold-NoRep. Threshold 4 may also be rsrp-ThresholdMsg3.

[0282] [[UE operation 3]]

[0283] In the subsequent RACH procedure, both Msg1 repetition and Msg3 repetition are applied. The condition may be at least one of SSBRSRP being greater than or equal to threshold 5 and less than or equal to threshold 6. Threshold 6 may also be rsrp-ThresholdMsg1.

[0284] Thresholds 1 / 2 / 3 / 4 / 5 / 6 may be defined in the specification or indicated by the base station via PBCH / SIB1 PDSCH / RRC IE.

[0285] Figure 8An example of the RACH procedure for RSRP referenced to DL path loss according to Embodiment #1a-3 is shown. For UEs capable of 2-step RACH of Rel.16 and UEs capable of Msg3 repetition of Rel.17, the operation is the same as that described in Embodiment #1a-1.

[0286] A UE supporting Msg1 repetition and Msg3 repetition may also apply 2-step RACH when RSRP is greater than rsrp-ThresholdMsgA. When RSRP is less than rsrp-ThresholdMsgA and greater than the threshold rsrp-ThresholdMsg3, the UE may also apply 4-step RACH without either Msg1 repetition or Msg3 repetition. When RSRP is less than the threshold rsrp-ThresholdMsg3 and greater than the threshold rsrp-ThresholdMsg1, the UE may also apply 4-step RACH with Msg3 repetition but without Msg1 repetition. When RSRP is less than the threshold rsrp-ThresholdMsg1, the UE may also apply 4-step RACH with Msg1 repetition and Msg3 repetition. RA resources for 2-step RACH and 4-step RACH without Msg1 repetition and Msg3 repetition may also be selected from pool #1. RA resources for 4-step RACH with Msg3 repetition but not Msg1 repetition may be selected from pool #2. RA resources for 4-step RACH with Msg1 repetition and Msg3 repetition may be selected from pool #3.

[0287] Implementation Method #1a-4

[0288] Some of the embodiments #1a-1 to #1a-3 may be combined. Embodiments #1a-2 / #1a-3 may also be applied when at least one of the following application conditions is satisfied.

[0289] [Application Condition 1]

[0290] In the case where one RAR is repeatedly transmitted for a plurality of Msg1s, a joint operation of Msg1 repetition and Msg3 repetition within one RACH process may be supported.

[0291] [Application Condition 2]

[0292] In the case where multiple RARs are repeatedly sent for multiple Msg1s, a joint operation of Msg1 repetition and Msg3 repetition within one RACH process may be supported.

[0293] [Application Condition 3]

[0294] In the case where the same transmission beam is used for multiple Msg1 repetitions, it is also possible to support a joint operation of Msg1 repetition and Msg3 repetition within one RACH process.

[0295] [Application Condition 4]

[0296] In the case where different transmission beams are used for multiple Msg1 repetitions, a joint operation of Msg1 repetition and Msg3 repetition within one RACH process may also be supported.

[0297] exist Fig. 9A In the example, the application conditions are application condition 1 and application condition 4. Fig. 9B In the example, the application conditions are application condition 2 and application condition 3.

[0298] According to this embodiment, the UE can appropriately determine the repetition of Msg1 / Msg3.

[0299] Implementation Method #1b

[0300] There is a tradeoff between the number of PRACH repetitions and the number of PRACH resources. It is preferable for a base station to be able to control at least one of whether to perform PRACH repetition and the maximum number of PRACH repetitions.

[0301] The UE may also receive settings / instructions related to information related to whether to perform PRACH repetition.

[0302] 《Implementation Method #1b-1》

[0303] The information related to whether to perform PRACH repetition may be at least one of the following pieces of information.

[0304] [Information 1]

[0305] This information indicates whether the PRACH repetition function is set to on or off. This information can also be implied based on other settings. For example, the RO / RA resource setting can also imply whether the PRACH repetition is set to on or off. For example, whether the setting related to the RSRP threshold exists can also imply whether the PRACH repetition is set to on or off.

[0306] [Message 2]

[0307] This information indicates the number of PRACH repetitions. Its candidate values ​​may also include at least one of {1, 2, 4, 8, 16, 32}. The value 1 may also be equivalent to setting the PRACH repetition to off.

[0308] [Message 3]

[0309] This information can also be the RSRP threshold. Fig.10 For example, the RSRP threshold for determining whether to perform PRACH repetition may also be defined for each entry. For example, when the RSRP threshold is a very small value (e.g. -∞), the UE operation may be to not perform PRACH repetition. For example, when the RSRP threshold is a small value, the UE operation may be to perform PRACH repetition with fewer UEs. For example, when the RSRP threshold is a large value, the UE operation may be to perform PRACH repetition with more UEs. For example, when the RSRP threshold is a very large value, the UE operation may be to perform PRACH repetition with more UEs. The RSRP threshold may be defined in the specification, set by RRC, or indicated via MAC CE / DCI.

[0310] Implementation Method #1b-2

[0311] The information related to whether to perform PRACH repetition may be set / indicated by at least one of the following several setting / indication methods.

[0312] [Setting / instruction method 1]

[0313] This information is set via SIB1 PDSCH.

[0314] [Setting / instruction method 2]

[0315] This information is set via RRC IE.

[0316] [Setting / instruction method 3]

[0317] This information is indicated via MAC CE.

[0318] [Setting / instruction method 4]

[0319] This information is indicated via DCI.

[0320] A combination of several of these configuration / indication methods may also be supported. For example, the information may be configured via SIB1 PDSCH and RRC IE.

[0321] The bit width of the setting / instruction may be different between different setting / instruction methods. For example, the setting / instruction method 1 may use 1 bit, and the setting / instruction method 2 may use 2 bits.

[0322] In order to support PRACH repetition in initial access, it is preferred to support at least setting / indication method 1.

[0323] Implementation Method #1b-3

[0324] Alternatively, the setting / instruction of information related to whether to perform PRACH repetition may need to satisfy at least one of the following necessary conditions.

[0325] [Requirement 1]

[0326] Support Msg3 repetition.

[0327] [Requirement 2]

[0328] Msg3 is set to repeatedly use RO / RA resources.

[0329] [Requirement 3]

[0330] Supports Msg1 repetition.

[0331] [Requirement 4]

[0332] The RO / RA resources that can be repeatedly used by Msg1 are set.

[0333] According to this embodiment, the UE can appropriately determine the repetition of Msg1 / Msg3.

[0334] <Implementation Method #X>

[0335] This embodiment relates to RACH resources.

[0336] The UE may also receive information related to a first random access procedure including a repetition of Msg1. Based on the information, the UE may also use a first random access resource for the first random access procedure and a second random access resource different from the first random access resource for a second random access procedure not including the repetition of Msg1.

[0337] Implementation Method #Xa

[0338] PRACH repetition may be performed only within specific RA resources.

[0339] 《《Implementation Method #Xa-1》》

[0340] The specific RA resource may also be at least one of the following RA resources.

[0341] [RA resource 1] An RA resource that can be used by at least the Msg3 repetition function.

[0342] [RA resource 2] RA resources that cannot be used by any of the functions including Msg3 repetition, RedCap, RAN slicing, and SDT.

[0343] [RA resource 3] At least RA resources that can be used by the PRACH repetition function. In this case, the PRACH repetition function is introduced.

[0344] [RA resource 4] Several combinations of RA resources 1 to 3. RA resource 1+RA resource 3, or RA resource 2+RA resource 3.

[0345] 《《Implementation Method #Xa-2》》

[0346] PRACH (Msg1) repetition may also comply with at least one of the following PRACH repetition definitions.

[0347] [PRACH repetition definition 1] Multiple PRACH transmissions with the same beam.

[0348] [PRACH repetition definition 2] Multiple PRACH transmissions with different beams.

[0349] [PRACH repetition definition 3] Multiple PRACH transmissions (with the same beam or different beams) before the RAR window expires.

[0350] [PRACH repetition definition 4] Multiple PRACH transmissions including the initial PRACH transmission.

[0351] [PRACH repetition definition 5] Multiple PRACH transmissions excluding the initial PRACH transmission. In this case, the initial PRACH transmission may be transmitted in the same RA resource as the RA resource of the PRACH transmission of Rel.15 / 16. Subsequent PRACH transmissions may also be transmitted in the RA resource in implementation #Xa-1.

[0352] RA resources, PRACH preamble codes, and PRACH preamble code indexes can also be overwritten with each other.

[0353] 《《Implementation Method #Xa-3》》

[0354] The RA resources used for PRACH repetition may also follow at least one of the following distinction methods.

[0355] [Classification method 1]

[0356] It is also conceivable to apply the aforementioned RA resource 1. For the RA resource that can be repeatedly used by at least Msg3, at least one of the following RA resource settings may be set.

[0357] [[RA resource setting 1-1]] The number of preamble code indices that can be used for PRACH repetition.

[0358] In the case where there is only a setting for the number of preamble indexes, the initial preamble index that can be used for PRACH repetition can also be determined according to each specific rule. For example, the initial preamble index can also be the initial preamble index for which Msg3 repetition is set. All preamble indexes that can be used for PRACH repetition can also be included in the preamble index that can be applied to Msg3 repetition, starting from the determined preamble index.

[0359] [[RA resource configuration 1-2]] can be used for the initial preamble index of PRACH repetition.

[0360] In the case where only the initial preamble index is set, the total number of preamble indexes that can be used for PRACH repetition can also be determined according to each specific rule. For example, the total number can also be the number of all preamble indexes set for Msg3 repetition starting from the set initial preamble index.

[0361] [Classification method 2]

[0362] It is also conceivable to apply the aforementioned RA resource 2. The RA resource used for PRACH repetition may be an RA resource other than RA resources that cannot be used by any of the functions of Msg3 repetition, RedCap, RAN slicing, and SDT.

[0363] [Classification method 3]

[0364] It is also conceivable to apply the aforementioned RA resource 3. For the RA resource that can be repeatedly used by at least Msg3, at least one of the following RA resource settings may be set.

[0365] [[RA resource configuration 3-1]] can be used for the initial preamble index of PRACH repetition.

[0366] [[RA resource setting 3-2]] The number of preamble code indices that can be used for PRACH repetition.

[0367] Similar to implementation #Xa-1, several combinations of classification methods 1 to 3 can also be considered.

[0368] 《Implementation Method #Xb》

[0369] PRACH repetition may be performed only within a specific RACH timing (RO).

[0370] 《《Implementation Method #Xb-1》》

[0371] The specific RO may also be at least one of the following several ROs.

[0372] [RO1] At least the RO that can use the repeated function of Msg3.

[0373] [RO2] Msg3 Repetition, RedCap, RAN Slicing, and SDT are all unavailable for this RO.

[0374] [RO3] At least the RO in which the PRACH repetition function can be used. In this case, the PRACH repetition function is introduced.

[0375] [RO4] Several combinations of RO1 to 3. RO1+RO3, or RO2+RO3.

[0376] 《《Implementation Method #Xb-2》》

[0377] PRACH repetition may also follow at least one of the following PRACH repetition definitions.

[0378] [PRACH repetition definition 1] Multiple PRACH transmissions with the same beam.

[0379] [PRACH repetition definition 2] Multiple PRACH transmissions with different beams.

[0380] [PRACH repetition definition 3] Multiple PRACH transmissions (with the same beam or different beams) before the RAR window expires.

[0381] [PRACH repetition definition 4] Multiple PRACH transmissions including the initial PRACH transmission.

[0382] [PRACH repetition definition 5] Multiple PRACH transmissions excluding the initial PRACH transmission. In this case, the initial PRACH transmission may be transmitted in the same RA resource as the RA resource of the PRACH transmission of Rel.15 / 16. Subsequent PRACH transmissions may also be transmitted in the RO in implementation #Xb-1.

[0383] 《《Implementation Method #Xb-3》》

[0384] The RO for PRACH repetition may also follow at least one of the following distinction methods.

[0385] [Classification method 1]

[0386] It is also conceivable to apply the aforementioned RO1. In order to determine the RO that can be used for PRACH repetition, it is also conceivable to explicitly configure the RO that is determined to be used for at least Msg3 repetition.

[0387] [Classification method 2]

[0388] It is also conceivable to apply the aforementioned RO2. In order to determine the RO that can be used for PRACH repetition, it is also possible to consider the RO that is not indexed by the corresponding mask and is set with other functions.

[0389] [Classification method 3]

[0390] It is also conceivable to apply the aforementioned RO3. In order to determine the RO that can be used for PRACH repetition, it is also conceivable to perform explicit configuration to determine at least the RO used for PRACH repetition.

[0391] Similar to implementation #Xb-1, a combination of several classification methods 1 to 3 can also be considered.

[0392] 《《Implementation Method #Xb-4》》

[0393] The restriction / extension of the mask index may also comply with at least one of the following restrictions / extensions.

[0394] [Restriction / Extension 1]

[0395] The PRACH mask index configured for PRACH repetition is different from the PRACH mask index configured for other functions / purposes. The function / purpose may also include at least one of the following functions / purposes.

[0396] Msg3 repeated

[0397] ·RedCap

[0398] ·SDT

[0399] RAN slicing

[0400] 2-step RA

[0401] None (i.e., existing 4-step RA)

[0402] [Restriction / Extension 2]

[0403] The available PRACH mask index entries may also be extended based on at least one of the following extension methods.

[0404] [[Extended Method 1]] adds an entry for PRACH opportunity index X. Here, X may also be an integer greater than 8.

[0405] [[Extended Method 2]] Add entries for the first / second / third / ... / Xth PRACH occasion within X PRACH occasions. Here, X may also be an integer greater than 2. For example, X may also be 3, 4, or 5.

[0406] [Restriction / Extension 3]

[0407] The bit width for PRACH mask index setting can also be extended to cover more than 16 entries.

[0408] According to this embodiment, the UE can appropriately determine the RACH resources used for PRACH repetition.

[0409] <Implementation Method #2>

[0410] This embodiment relates to the combined operation of Msg1 repetition and Msg3 repetition.

[0411] The UE may also receive information related to a random access procedure including multiple iterations of Msg1 and multiple iterations of Msg3. The UE may also determine one or more second beams used in the multiple iterations of Msg3 based on the information and one or more first beams used in the multiple iterations of Msg1.

[0412] Scenario 1

[0413] In the combined operation of Msg1 repetition with Msg3 repetition in one RACH process, one RAR is transmitted for a plurality of Msg1 repetitions.

[0414] The transmission beam of Msg3 repetition may also depend on the beam of at least one of Msg1 repetition and the detected RAR.

[0415] The transmission beam repeatedly transmitted in Msg3 may be one of the following transmission beams.

[0416] [Transmit beam 1-1]

[0417] The same beam may also be used for all Msg3 iterations.

[0418] [[Transmit beam 1-1A]]

[0419] The same beam for all Msg3 repetitions can also be determined by the beam for Msg1 repetitions.

[0420] Example: When multiple Msg1s use the same beam repeatedly, the beam used in Msg3 can be the same as the beam used in Msg1. Fig.11 ).

[0421] Example: When multiple Msg1 repetitions use different beams, the beams of Msg3 repetitions can also follow the beams of Msg1 repetitions in the first / last / random order. Fig.12 In the example of , the four repetitions of Msg3 use the beam used in the first repetition among the four repetitions of Msg1.

[0422] [[Transmit beam 1-1B]]

[0423] The same beam repeated for all Msg3 can also be determined by the detected RAR.

[0424] Example: The beam may be determined by explicit indication in the RAR. A field in the RAR may indicate the beam repeated for Msg3. It may also be stipulated that the UE assumes that the indicated beam is obtained based on the beam repeated in Msg1. Fig.13 In the example of , RAR indicates the beam used in the four repetitions of Msg3. This beam is used for one of the four repetitions of Msg1.

[0425] Example: The beam may also be determined by an implicit indication such as RA-RNTI. For example, the beam may also be determined by the RO corresponding to the RA-RNTI used in the detected RAR.

[0426] [Transmit beam 1-2]

[0427] Different beams may also be used for all Msg3 iterations.

[0428] [[Transmit beam 1-2A]]

[0429] The beams of the multiple Msg3 repetitions may be determined by the beams of the multiple Msg1 repetitions. When the multiple Msg1 repetitions use different beams, the beams of the multiple Msg3 repetitions may follow the beams of the multiple Msg1 repetitions.

[0430] Example: When the number of Msg1 repetitions is equal to the number of Msg3 repetitions, the mapping of multiple Msg1 repetition beams to multiple Msg3 repetition beams may be one-to-one mapping. Fig.14 In the example of , the four beams used in the four repetitions of Msg3 are the four beams used in the four repetitions of Msg1.

[0431] Example: When the number of Msg1 repetitions is less than the number of Msg3 repetitions, the mapping of beams of multiple Msg1 repetitions and beams of multiple Msg3 repetitions may be sequential mapping or cyclic mapping. Fig.15 In the example of , for the 4 beams used in the 4 iterations of Msg3, the 2 beams used in the 2 iterations of Msg1 are cyclically applied (cyclic mapping). Fig.16 In the example of , for the four beams used in the four iterations of Msg3, each beam used in the two iterations of Msg1 is applied twice in succession (sequential mapping).

[0432] Example: When the number of Msg1 repetitions is greater than the number of Msg3 repetitions N, the beam of N Msg3 repetitions may be the beam of N Msg1 repetitions from the beginning / from the end / randomly. Fig.17 In the example of , the two beams used in the two iterations of Msg3 are the beams used in the first two iterations within the four iterations of Msg1.

[0433] [[Transmit beam 1-2B]]

[0434] The beams of multiple Msg3 repetitions can also be determined by the detected RAR.

[0435] Example: The beam may be determined by explicit indication in the RAR. It may also be specified that the UE assumes that the indicated beam is obtained from the beam repeated in Msg1.

[0436] Scenario 2

[0437] In the combined operation of Msg1 repetition with Msg3 repetition within one RACH process, a plurality of RARs are transmitted for a plurality of Msg1 repetitions.

[0438] In each Msg3 scheduled by each RAR, the beams for multiple repetitions of Msg3 may also depend on at least one of the following beams: the corresponding Msg1 repetition, the corresponding RAR, and the beams of all Msg1 repetitions.

[0439] The UE may also follow at least one of the following operations.

[0440] ·The UE does not assume different numbers of repetitions for multiple Msg3 PUSCHs.

[0441] The UE does not assume that the total number of repetitions for a plurality of Msg3 PUSCHs exceeds a certain value.

[0442] The UE does not assume that any previous repetition of Msg3 PUSCH will collide with any subsequent repetition of Msg3 PUSCH.

[0443] ·The UE does not assume that any repetition of a previous Msg3 PUSCH starts / ends later than any repetition of a subsequent Msg3 PUSCH.

[0444] The transmission beam repeatedly transmitted in Msg3 may be one of the following transmission beams.

[0445] [Transmit beam 2-1]

[0446] The same beam may also be used for all Msg3 iterations.

[0447] [[Transmit beam 2-1A]]

[0448] The same beam for all Msg3 repetitions can also be determined by the corresponding beam for Msg1 repetitions. Fig.18 In the example, multiple Msg1 repetitions use the same beam, and one beam used in four repetitions of Msg3 is the beam used in the corresponding Msg1 repetition. Fig.19 In the example of , different beams are used in multiple Msg1 repetitions, and one beam used in four repetitions of Msg3 is the beam used in the corresponding Msg1 repetition.

[0449] [[Transmit beam 2-1B]]

[0450] The same beam repeated for all Msg3 can also be determined by the corresponding RAR.

[0451] Example: The beam may be determined by explicit indication in the RAR. One field in the RAR may indicate the beam repeated for Msg3. It may be stipulated that the UE assumes that the indicated beam is obtained from the beam repeated in Msg1.

[0452] Example: The beam may be determined by an implicit indication such as RA-RNTI. For example, the beam may be determined by the RO corresponding to the RA-RNTI used in the detected RAR.

[0453] [[Transmit beam 2-1C]]

[0454] The same beam repeated for all Msg3 can also be determined by the beam repeated for all Msg1.

[0455] Example: When the same beam is repeatedly used for a plurality of Msg1s, the beam for which Msg3 is repeatedly used may be the same as the transmission beam 2-1A.

[0456] Example: When multiple Msg1 repetitions use different beams, the beam of Msg3 repetitions may follow the beam of Msg1 repetitions in the first / last / random order.

[0457] [Transmit beam 2-2]

[0458] Different beams may also be used for all Msg3 iterations.

[0459] [[Transmit beam 2-2A]]

[0460] The beams of the multiple Msg3 repetitions may be determined by all the beams of the Msg1 repetitions. When the multiple Msg1 repetitions use different beams, the beams of the multiple Msg3 repetitions may follow the beams of the multiple Msg1 repetitions.

[0461] Example: When the number of Msg1 repetitions is equal to the number of Msg3 repetitions, the mapping of beams of multiple Msg1 repetitions to beams of multiple Msg3 repetitions may be one-to-one mapping.

[0462] Example: When the number of Msg1 repetitions is less than the number of Msg3 repetitions, the mapping of beams of multiple Msg1 repetitions and beams of multiple Msg3 repetitions may be sequential mapping or cyclic mapping. Fig. 20 In the example of , for the four beams used in the four iterations of Msg3, the two beams used in the two iterations of Msg1 are cyclically applied (cyclic mapping). Fig.21 In the example of , for the four beams used in the four iterations of Msg3, each beam used in the two iterations of Msg1 is applied twice in succession (sequential mapping).

[0463] Example: When the number of Msg1 repetitions is greater than the number N of Msg3 repetitions, the beam of N Msg3 repetitions may be the beam of N Msg1 repetitions from the first / from the last / randomly.

[0464] [[Transmit beam 2-2B]]

[0465] The beams of multiple Msg3 repetitions can also be determined by the corresponding RAR.

[0466] Example: The beam may be determined by explicit indication in the RAR. One field in the RAR may indicate one or more beams repeated for Msg3. It may be stipulated that the UE assumes that the indicated beam is obtained from the beam repeated in Msg1.

[0467] According to this embodiment, the UE can appropriately determine the beam for Msg3 repetition when performing Msg1 repetition and Msg3 repetition.

[0468] <Implementation Method #3>

[0469] This embodiment relates to the number of Msg3 repetitions.

[0470] The UE may also receive indication information related to the number of repetitions of Msg3. The UE may also determine the number of repetitions of Msg3 based on the indication information and information related to repetitions of Msg1 in a random access procedure including the repetitions of Msg3.

[0471] The interpretation of the number of Msg3 repetitions indicated by RAR may also depend on at least one of the following embodiments #3-1 to #3-5.

[0472] 《Implementation Method #3-1》

[0473] The interpretation of the number of Msg3 repetitions indicated by the RAR may also depend on whether more than one Msg1 repetition is performed in the current RACH procedure.

[0474] In the case where there is no Msg1 repetition in the current RACH process, the interpretation of the number of Msg3 repetitions indicated by the RAR can also follow the Rel.17 rule. That is, the 2 bits from the MCS field can also be reused for the interpretation based on the 4 candidate values. Fig.22A In the example of , 2 bits from the MCS field indicate 1 value among 4 candidate values ​​for the number of Msg3 repetitions.

[0475] In the case where Msg1 repetitions exist in the current RACH process, at least one of the number of bits indicating the number of Msg3 repetitions indicated by the RAR and the candidate values ​​may also be different from the Rel.17 rule. For example, X bits from the MCS field may also be used for up to 2 of the number of Msg3 repetitions. X An indication of one of the candidate values. X can be equal to 2, less than 2, or more than 2. At most 2 X The candidate values ​​can be defined in the specification or set through PBCH / SIB1 PDSCH / RRC IE. The candidate values ​​may not exceed the upper limit of 4 / 8 / 16 / 32 / 64. Fig. 22B In the example of , 2 bits from the MCS field indicate 1 of 4 candidate values ​​for the number of Msg3 repetitions. Fig. 22C In the example of , 1 bit from the MCS field indicates 1 of 2 candidate values ​​for the number of Msg3 repetitions.

[0476] When Msg1 is repeated, the value / range of the required number of Msg3 repetitions may be larger than the value of Rel. 17. Therefore, for a case with Msg1 repetitions, the value defined / set for the number of Msg3 repetitions may be different from the value for a case without Msg1 repetitions.

[0477] 《Implementation Method #3-2》

[0478] In the case where multiple Msg1 repetitions are performed within the current RACH procedure, the interpretation of the number of Msg3 repetitions indicated by the RAR may also depend on whether one RAR is sent or multiple RARs are sent.

[0479] In the case where there are multiple Msg1 repetitions within the current RACH process, the number of bits indicating the number of Msg3 repetitions and at least one of the candidate values ​​may also be different between the following situations: a situation where only one RAR is sent for multiple Msg1 repetitions (Situation 1), and a situation where multiple RARs are sent for multiple Msg1 repetitions (Situation 2).

[0480] For example, when only one RAR is sent for multiple Msg1 repetitions (case 1), X bits from the MCS field may also be used for up to 2 of the number of Msg3 repetitions. X An indication of one of the candidate values. X can be equal to 2, less than 2, or more than 2. At most 2 X The candidate values ​​can be defined in the specification or set via PBCH / SIB1PDSCH / RRC IE. Up to 2 X The candidate values ​​may be the same as the candidate values ​​set for UE supporting Msg3 repetition of Rel. 17. The candidate values ​​may not exceed an upper limit of 4 / 8 / 16 / 32 / 64.

[0481] A new field of X bits in the RAR can also be used for the maximum number of Msg3 repetitions of 2 X An indication of one of the candidate values.

[0482] For example, when multiple RARs are sent for multiple Msg1 repetitions (Case 2), the Y bit from the MCS field can also be used for up to 2 of the number of Msg3 repetitions. Y An indication of one of the candidate values. Y can be equal to 2, less than 2, or more than 2. At most 2 Y The candidate values ​​can be defined in the specification or set via PBCH / SIB1PDSCH / RRC IE. Up to 2 XThe candidate values ​​may be the same as the candidate values ​​set for UE supporting Msg3 repetition of Rel. 17. The candidate values ​​may not exceed an upper limit of 4 / 8 / 16 / 32 / 64.

[0483] The new field of Y bit in RAR can also be used for the maximum number of Msg3 repetitions of 2 Y The 2 bits of the MCS field in the first RAR can also be used to indicate one of the maximum 4 candidate values ​​for the number of Msg3 repetitions (same as Rel.17). The new field of the Y bit in the second and subsequent RARs can also be used to indicate the maximum 2 candidate values ​​for the number of Msg3 repetitions. Y An indication of one of the candidate values.

[0484] 《Implementation Method #3-3》

[0485] (In the case where the base station is able to know the number of Msg1 repetitions) the interpretation of the number of Msg3 repetitions indicated by the RAR may also depend on the number of Msg1 repetitions in the current RACH process. For example, the case where the base station is able to know the number of Msg1 repetitions may be a case where the RACH resource pool is associated with the number of Msg1 repetitions, or a case where there is only one number of repetitions for Msg1.

[0486] In the case where there are multiple Msg1 repetitions in the current RACH procedure, at least one of the number of bits indicating the number of Msg3 repetitions and the candidate values ​​may be different between cases with different numbers of Msg1 repetitions.

[0487] For example, in the case where there are 4 repetitions of Msg1, X bits from the MCS field may also be used for up to 2 of the number of Msg3 repetitions. X An indication of one of the candidate values. X can be equal to 2, less than 2, or more than 2. At most 2 X The candidate values ​​can be defined in the specification or set via PBCH / SIB1 PDSCH / RRC IE. Up to 2 X The candidate values ​​may be the same as the candidate values ​​set for UE supporting Msg3 repetition of Rel. 17. The candidate values ​​may not exceed an upper limit of 4 / 8 / 16 / 32 / 64.

[0488] A new field of X bits in the RAR can also be used for the maximum number of Msg3 repetitions of 2 XThe 2 bits of the MCS field in the first RAR can also be used to indicate one of the maximum 4 candidate values ​​for the number of Msg3 repetitions (same as Rel.17). The new field of X bits in the second and subsequent RARs can also be used to indicate the maximum 2 candidate values ​​for the number of Msg3 repetitions. X An indication of one of the candidate values.

[0489] For example, in the case where there are 8 repetitions of Msg1, the Y bit from the MCS field may also be used for up to 2 of the number of Msg3 repetitions. Y An indication of one of the candidate values. Y can be equal to 2, less than 2, or more than 2. At most 2 Y The candidate values ​​can be defined in the specification or set via PBCH / SIB1 PDSCH / RRC IE. Up to 2 X The candidate values ​​may be the same as the candidate values ​​set for UE supporting Msg3 repetition of Rel. 17. The candidate values ​​may not exceed an upper limit of 4 / 8 / 16 / 32 / 64.

[0490] The new field of Y bit in RAR can also be used for the maximum number of Msg3 repetitions of 2 Y The 2 bits of the MCS field in the first RAR can also be used to indicate one of the maximum 4 candidate values ​​for the number of Msg3 repetitions (same as Rel.17). The new field of the Y bit in the second and subsequent RARs can also be used to indicate the maximum 2 candidate values ​​for the number of Msg3 repetitions. Y An indication of one of the candidate values.

[0491] 《Implementation Method #3-4》

[0492] In the case where multiple Msg1 repetitions are performed within the current RACH procedure, the interpretation of the number of Msg3 repetitions indicated by the RAR may also depend on whether the same beam or different beams are used for the multiple Msg1 repetitions.

[0493] When there are multiple Msg1 repetitions in the current RACH process, at least one of the number of bits indicating the number of Msg3 repetitions and the candidate values ​​may also be different between the case where multiple Msg1 repetitions use the same beam and the case where multiple Msg1 repetitions use different beams.

[0494] For example, in the case where multiple Msg1s are repeated using the same beam, X bits from the MCS field may also be used for up to 2 of the number of Msg3 repetitions. XAn indication of one of the candidate values. X can be equal to 2, less than 2, or more than 2. At most 2 X The candidate values ​​can be defined in the specification or set via PBCH / SIB1 PDSCH / RRC IE. Up to 2 X The candidate values ​​may be the same as the candidate values ​​set for UE supporting Msg3 repetition of Rel. 17. The candidate values ​​may not exceed an upper limit of 4 / 8 / 16 / 32 / 64.

[0495] A new field of X bits in the RAR can also be used for the maximum number of Msg3 repetitions of 2 X The 2 bits of the MCS field in the first RAR can also be used to indicate one of the maximum 4 candidate values ​​for the number of Msg3 repetitions (same as Rel.17). The new field of X bits in the second and subsequent RARs can also be used to indicate the maximum 2 candidate values ​​for the number of Msg3 repetitions. X An indication of one of the candidate values.

[0496] For example, in the case where multiple Msg1 repetitions use different beams, the Y bit from the MCS field can also be used for up to 2 of the number of Msg3 repetitions. Y An indication of one of the candidate values. Y can be equal to 2, less than 2, or more than 2. At most 2 Y The candidate values ​​can be defined in the specification or set via PBCH / SIB1 PDSCH / RRC IE. Up to 2 X The candidate values ​​may be the same as the candidate values ​​set for UE supporting Msg3 repetition of Rel. 17. The candidate values ​​may not exceed an upper limit of 4 / 8 / 16 / 32 / 64.

[0497] The new field of Y bit in RAR can also be used for the maximum number of Msg3 repetitions of 2 Y The 2 bits of the MCS field in the first RAR can also be used to indicate one of the maximum 4 candidate values ​​for the number of Msg3 repetitions (same as Rel.17). The new field of the Y bit in the second and subsequent RARs can also be used to indicate the maximum 2 candidate values ​​for the number of Msg3 repetitions. Y An indication of one of the candidate values.

[0498] Implementation Method #3-5

[0499] The interpretation of the number of Msg3 repetitions indicated by RAR may also depend on a combination of several of implementations #3-2, #3-3, and #3-4.

[0500] For example, the interpretation may also depend on the combination of implementation modes #3-2 and #3-3.

[0501] For example, the interpretation may also depend on the combination of implementation modes #3-2 and #3-4.

[0502] For example, the interpretation may also depend on the combination of implementation modes #3-3 and #3-4.

[0503] For example, the interpretation may also depend on the combination of implementation modes #3-2, #3-3, and #3-4.

[0504] According to this embodiment, the UE can appropriately determine the number of repetitions of Msg3.

[0505] <Supplement>

[0506] At least one operation of the above-mentioned implementation manner may also be applied only to a UE that reports a specific UE capability (UE capability) or supports the specific UE capability.

[0507] The specific UE capability may also represent at least one of the following:

[0508] Supporting specific processing / operation / control / information related to at least one of the above-mentioned embodiments.

[0509] Supports simultaneous Msg1 repetition and Msg3 repetition (combination / joint operation of Msg1 repetition and Msg3 repetition).

[0510] In the case where one RAR for a plurality of Msg1 repetitions is transmitted (case 1), both Msg1 repetitions and Msg3 repetitions in one RACH procedure are supported.

[0511] In the case where a plurality of RARs for a plurality of Msg1 repetitions are transmitted (case 2), both Msg1 repetition and Msg3 repetition in one RACH procedure are supported.

[0512] When the same transmission beam is used for a plurality of Msg1 repetitions, both Msg1 repetition and Msg3 repetition in one RACH process are supported.

[0513] When different transmission beams are used for a plurality of Msg1 repetitions, both Msg1 repetition and Msg3 repetition in one RACH process are supported.

[0514] Supports the determination of one or more beams depending on one or more repetitions of Msg1 and one or more repetitions of Msg3.

[0515] Supports reuse / interpretation depending on the number of repetitions of Msg1 or Msg3.

[0516] In addition, the above-mentioned specific UE capabilities can be capabilities that are applied across all frequencies (commonly regardless of frequency), capabilities for each frequency (for example, cell, band, BWP), capabilities for each frequency range (for example, Frequency Range 1 (FR1)), FR2, FR3, FR4, FR5, FR2-1, FR2-2), and capabilities for each subcarrier spacing (SubCarrier Spacing (SCS)).

[0517] Furthermore, the specific UE capability may be a capability applied across all duplex modes (commonly regardless of the duplex mode) or a capability for each duplex mode (eg, time division duplex (TDD) or frequency division duplex (FDD)).

[0518] In addition, at least one operation of the above-mentioned embodiment may also be applied when the UE is configured with specific information associated with the above-mentioned embodiment through high-layer signaling. For example, the specific information may also be information indicating activation of at least one operation of the above-mentioned embodiment, any RRC parameter for a specific version (e.g., Rel.18), etc.

[0519] When the UE does not support at least one operation of the above-mentioned specific UE capabilities or is not configured with the above-mentioned specific information, for example, the operations of Rel.15 / 16 / 17 may be applied.

[0520] (Note A)

[0521] The following inventions are added to one embodiment of the present disclosure.

[0522] [Note 1]

[0523] A terminal having:

[0524] a sending unit that sends first capability information related to the capability of repeating message 1 and second capability information related to the capability of repeating message 3; and

[0525] The control unit determines whether to perform a first random access process including repetitions of the message 1 and the message 3, or to perform a second random access process that does not include at least one of the repetitions of the message 1 and the message 3, based on the first capability information and the second capability information.

[0526] [Note 2]

[0527] A terminal as described in Appendix 1, wherein:

[0528] The control unit uses a first random access resource for the first random access procedure, and uses a second random access resource different from the first random access resource for the second random access procedure.

[0529] [Note 3]

[0530] A terminal as described in Supplement 1 or Supplement 2, wherein:

[0531] The control unit determines whether to perform the first random access procedure or the second random access procedure based on a comparison between the reference signal received power and a threshold.

[0532] [Note 4]

[0533] A terminal as described in any one of Notes 1 to 3, wherein:

[0534] The control unit controls reception of information related to at least one of a maximum number of repetitions of the message 1 and a threshold value for reference signal received power.

[0535] (Note B)

[0536] The following inventions are added to one embodiment of the present disclosure.

[0537] [Note 1]

[0538] A terminal having:

[0539] a receiving unit, receiving information related to a repeated first random access procedure including message 1; and

[0540] The control unit uses, based on the information, a first random access resource for the first random access procedure, and uses a second random access resource different from the first random access resource for a second random access procedure that does not include the repetition of the message 1.

[0541] [Note 2]

[0542] A terminal as described in Appendix 1, wherein:

[0543] The information includes at least one of the number of preamble indexes used for the first random access resource and an initial preamble index used for the first random access resource.

[0544] [Note 3]

[0545] A terminal as described in Supplement 1 or Supplement 2, wherein:

[0546] The control unit uses a first random access channel opportunity for the first random access procedure, and uses a second random access channel opportunity different from the first random access channel opportunity for the second random access procedure.

[0547] [Note 4]

[0548] A terminal as described in any one of Notes 1 to 3, wherein:

[0549] The control unit determines a first random access channel opportunity for the first random access procedure based on at least one of a mask index and a second random access channel opportunity for the second random access procedure.

[0550] (Note C)

[0551] The following inventions are added to one embodiment of the present disclosure.

[0552] [Note 1]

[0553] A terminal having:

[0554] a receiving unit, receiving information related to a random access procedure including a plurality of iterations of message 1 and a plurality of iterations of message 3; and

[0555] The control unit determines one or more second beams used in the multiple repetitions of the message 3 based on the information and based on one or more first beams used in the multiple repetitions of the message 1.

[0556] [Note 2]

[0557] A terminal as described in Appendix 1, wherein:

[0558] The control unit determines the one or more second beams from the one or more first beams.

[0559] [Note 3]

[0560] A terminal as described in Supplement 1 or Supplement 2, wherein:

[0561] One random access response is transmitted for a plurality of repetitions of the message 1.

[0562] [Note 4]

[0563] A terminal as described in any one of Notes 1 to 3, wherein:

[0564] One random access response is transmitted for each of the plurality of iterations of the message 1 .

[0565] (Note D)

[0566] The following inventions are added to one embodiment of the present disclosure.

[0567] [Note 1]

[0568] A terminal having:

[0569] a receiving unit, receiving indication information related to the number of repetitions of message 3; and

[0570] The control unit determines the number of repetitions of the message 3 based on the indication information and information related to repetitions of the message 1 in the random access procedure including the repetitions of the message 3.

[0571] [Note 2]

[0572] A terminal as described in Appendix 1, wherein:

[0573] The information relates to the number of repetitions of the message 1 .

[0574] [Note 3]

[0575] A terminal as described in Supplement 1 or Supplement 2, wherein:

[0576] The information is related to the number of random access responses to the message 1.

[0577] [Note 4]

[0578] A terminal as described in any one of Notes 1 to 3, wherein:

[0579] The information is related to the number of beams used in the iterations of the message 1.

[0580] (Wireless Communication System)

[0581] Hereinafter, a configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In the wireless communication system, communication is performed using any one of the wireless communication methods according to the above-mentioned embodiments of the present disclosure or a combination thereof.

[0582] Fig.231 is a diagram showing an example of a schematic structure of a wireless communication system involved in one embodiment. The wireless communication system 1 may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5G NR), or the like.

[0583] In addition, the wireless communication system 1 may also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC may also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (E-UTRA-NR Dual Connectivity (EN-DC))), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC))), etc.

[0584] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the master node (Master Node (MN)), and the base station (gNB) of NR is the secondary node (Secondary Node (SN)). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0585] The wireless communication system 1 may also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both MN and SN are NR base stations (gNB)).

[0586] The wireless communication system 1 may also include a base station 11 that forms a macro cell C1 with a relatively wide coverage, and a base station 12 (12a-12c) that is configured in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located in at least one cell. The configuration and number of each cell and user terminal 20 are not limited to the method shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as base stations 10.

[0587] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).

[0588] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (below 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to these. For example, FR1 may also be equivalent to a frequency band higher than FR2.

[0589] 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.

[0590] Multiple base stations 10 may also be connected by wire (e.g., optical fiber based on Common Public Radio Interface (CPRI), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, the base station 11 equivalent to the upper station may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to a relay station (relay) may also be referred to as an IAB node.

[0591] The base station 10 may be connected to the core network 30 via other base stations 10 or directly. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC).

[0592] The user terminal 20 may also be a terminal that supports at least one of communication modes such as LTE, LTE-A, and 5G.

[0593] In the wireless communication system 1, a wireless access method based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), cyclic prefix OFDM (CP-OFDM), discrete Fourier transform spread OFDM (DFT-s-OFDM), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. may be used.

[0594] The radio access scheme may also be referred to as a waveform. In addition, in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the radio access schemes for UL and DL.

[0595] As downlink channels, the wireless communication system 1 may use a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20 , a broadcast channel (Physical Broadcast Channel (PBCH))), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc.

[0596] In addition, as uplink channels, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. can also be used in the wireless communication system 1.

[0597] User data, high-layer control information, System Information Block (SIB), etc. are transmitted through PDSCH. User data, high-layer control information, etc. can also be transmitted through PUSCH. In addition, Master Information Block (MIB) can also be transmitted through PBCH.

[0598] The lower layer control information may also be transmitted via the PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of the PDSCH and the PUSCH.

[0599] In addition, the DCI for scheduling the PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling the PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may also be rewritten as DL data, and the PUSCH may also be rewritten as UL data.

[0600] In the detection of PDCCH, the control resource set (CORESET) and the search space can also be used. CORESET corresponds to the resources for searching DCI. The search space corresponds to the search area and search method of PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space setting.

[0601] A search space may also correspond to a PDCCH candidate corresponding to one or more aggregation levels. One or more search spaces may also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting" and the like in the present disclosure may also be rewritten mutually.

[0602] Uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also known as hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) can also be transmitted through PUCCH. The random access preamble used to establish a connection with a cell can also be transmitted through PRACH.

[0603] In the present disclosure, downlink, uplink, etc. may be expressed without “link.” In addition, various channels may be expressed without “Physical” at the beginning.

[0604] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. can also be transmitted. As DL-RS, in the wireless communication system 1, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. can also be transmitted.

[0605] The synchronization signal may be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may also be referred to as SS / PBCH block, SS block (SS Block (SSB)), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0606] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. may also be transmitted. In addition, DMRS may also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0607] (Base Station)

[0608] Fig.24 1 is a diagram showing an example of a structure of a base station involved in one embodiment. The base station 10 includes a control unit 110, a transmitting and receiving unit 120, a transmitting and receiving antenna 130, and a transmission path interface (transmission line interface) 140. In addition, the control unit 110, the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission path interface 140 may each be provided with more than one.

[0609] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also assumed that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0610] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0611] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc. using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be sent as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting, release, etc.) of communication channels, state management of the base station 10, management of wireless resources, etc.

[0612] The transmitting and receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measuring unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting and receiving unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0613] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0614] The transmitting / receiving antenna 130 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0615] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channel, uplink reference signal, etc.

[0616] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0617] The sending and receiving unit 120 (sending processing unit 1211), for example, may also perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 110, to generate a bit string to be sent.

[0618] The transmitting and receiving unit 120 (transmitting processing unit 1211) may also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), discrete Fourier transform (DFT) processing (as needed), inverse fast Fourier transform (IFFT) processing), precoding, digital-to-analog conversion and other transmission processing on the bit string to be transmitted, and output a baseband signal.

[0619] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0620] On the other hand, the transmission and reception unit 120 (RF unit 122 ) may also perform amplification, filter processing, demodulation into a baseband signal, etc. on the signal in the radio frequency band received by the transmission and reception antenna 130 .

[0621] The transmitting and receiving unit 120 (receiving processing unit 1212) may also apply receiving processing such as analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filter processing (filtering processing), demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to obtain user data, etc.

[0622] The transmitting and receiving unit 120 (the measuring unit 123) may also implement measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (RRM) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also measure received power (e.g., reference signal received power (RSRP)), received quality (e.g., reference signal received quality (RSRQ), signal to interference plus noise ratio (SINR), signal to noise ratio (SNR)), signal strength (e.g., received signal strength indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0623] The transmission path interface 140 can also send and receive signals (return signaling) between devices included in the core network 30, other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0624] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission and reception unit 120 , the transmission and reception antenna 130 , and the transmission path interface 140 .

[0625] The transmitting and receiving unit 120 may also receive first capability information related to the capability of repetition of message 1 and second capability information related to the capability of repetition of message 3. The control unit 110 may also determine whether to perform a first random access procedure including repetition of the message 1 and repetition of the message 3, or to perform a second random access procedure not including at least one of the repetition of the message 1 and the repetition of the message 3, based on the first capability information and the second capability information.

[0626] The sending and receiving unit 120 may also send information related to the first random access procedure including the repetition of message 1. The control unit 110 may also use the first random access resource for the first random access procedure based on the information, and use the second random access resource different from the first random access resource for the second random access procedure that does not include the repetition of message 1.

[0627] The transmitting and receiving unit 120 may also send information related to the random access process including multiple repetitions of message 1 and multiple repetitions of message 3. The control unit 110 may also determine one or more second beams used in the multiple repetitions of message 3 based on the information and based on one or more first beams used in the multiple repetitions of message 1.

[0628] The transmitting and receiving unit 120 may also transmit indication information related to the number of repetitions of the message 3. The control unit 110 may also determine the number of repetitions of the message 3 based on the indication information and information related to repetitions of the message 1 in the random access procedure including the repetitions of the message 3.

[0629] (User terminal)

[0630] Fig.25 2 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. In addition, the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided in one or more portions.

[0631] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also conceivable that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0632] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0633] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 220.

[0634] The transmitting and receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measuring unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting and receiving unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0635] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be configured as a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0636] The transmitting / receiving antenna 230 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0637] The transmitting and receiving unit 220 may also receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0638] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0639] The sending and receiving unit 220 (sending processing unit 2211) may also perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0640] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0641] In addition, whether to apply DFT processing may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is valid (enabled), the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing without performing DFT processing.

[0642] The transmitting and receiving unit 220 (RF unit 222 ) may perform modulation, filter processing (filtering processing), amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0643] On the other hand, the transmission and reception unit 220 (RF unit 222 ) may perform amplification, filter processing (filter processing), demodulation into a baseband signal, etc. on the signal in the radio frequency band received by the transmission and reception antenna 230 .

[0644] The sending and receiving unit 220 (receiving processing unit 2212) can also apply receiving processing such as analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing (filtering processing), demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0645] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to the received signal. For example, the measuring unit 223 may also perform RRM measurement, CSI measurement, etc. based on the received signal. The measuring unit 223 may also measure the received power (e.g., RSRP), the received quality (e.g., RSRQ, SINR, SNR), the signal strength (e.g., RSSI), the propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0646] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0647] The transmitting and receiving unit 220 may also send first capability information related to the capability of repetition of message 1 and second capability information related to the capability of repetition of message 3. The control unit 210 may also determine whether to perform a first random access procedure including repetition of the message 1 and repetition of the message 3, or to perform a second random access procedure not including at least one of the repetition of the message 1 and the repetition of the message 3, based on the first capability information and the second capability information.

[0648] The control unit 210 may also use a first random access resource for the first random access procedure, and use a second random access resource different from the first random access resource for the second random access procedure.

[0649] The control unit 210 may also decide whether to perform the first random access procedure or the second random access procedure based on a comparison between the reference signal received power and a threshold.

[0650] The control unit 210 may also control reception of information related to at least one of a maximum number of repetitions of the message 1 and a threshold value for reference signal received power.

[0651] The sending and receiving unit 220 may also receive information related to the first random access procedure including the repetition of message 1. The control unit 210 may also use the first random access resource for the first random access procedure based on the information, and use the second random access resource different from the first random access resource for the second random access procedure that does not include the repetition of message 1.

[0652] The information may also include at least one of the number of preamble indexes used for the first random access resource and an initial preamble index used for the first random access resource.

[0653] The control unit 210 may also use a first random access channel opportunity for the first random access procedure, and use a second random access channel opportunity different from the first random access channel opportunity for the second random access procedure.

[0654] The control unit 210 may also determine a first random access channel opportunity for the first random access procedure based on at least one of a mask index and a second random access channel opportunity for the second random access procedure.

[0655] The transmitting and receiving unit 220 may also receive information related to a random access process including multiple repetitions of message 1 and multiple repetitions of message 3. The control unit 210 may also determine one or more second beams used in the multiple repetitions of message 3 based on the information and based on one or more first beams used in the multiple repetitions of message 1.

[0656] The control unit 210 may also determine the one or more second beams from the one or more first beams.

[0657] One random access response may be transmitted for a plurality of repetitions of the message 1.

[0658] One random access response may be transmitted for each of a plurality of iterations of the message 1 .

[0659] The transmitting and receiving unit 220 may also receive indication information related to the number of repetitions of the message 3. The control unit 210 may also determine the number of repetitions of the message 3 based on the indication information and information related to repetitions of the message 1 in the random access procedure including the repetitions of the message 3.

[0660] The information may also relate to the number of repetitions of the message 1 .

[0661] The information may also be related to the number of random access responses to the message 1 .

[0662] The information may also be related to the number of beams used in the iterations of the message 1.

[0663] (Hardware structure)

[0664] In addition, the block diagram used in the description of the above-mentioned embodiment shows a block of a functional unit. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more physically or logically separated devices can be directly or indirectly connected (for example, by wire, wireless, etc.) and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0665] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method thereof is not particularly limited.

[0666] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Fig.26 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0667] In addition, in the present disclosure, the terms such as device, circuit, equipment, section, and unit can be interchanged. The hardware configuration of the base station 10 and the user terminal 20 may include one or more of the devices shown in the figure, or may exclude some of the devices.

[0668] For example, only one processor 1001 is shown, but there may be multiple processors. In addition, the processing may be performed by one processor, or may be performed by two or more processors simultaneously, sequentially, or in other ways. In addition, the processor 1001 may also be implemented by one or more chips.

[0669] The functions of the base station 10 and the user terminal 20 are realized, for example, by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0670] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, at least a part of the control unit 110 (210), the transmission and reception unit 120 (220), etc. described above may also be implemented by the processor 1001.

[0671] In addition, the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes based on them. As a program, a program that causes a computer to perform at least a part of the operations described in the above-mentioned embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the other functional blocks can also be implemented in the same way.

[0672] The memory 1002 may also be a computer-readable recording medium, for example, composed of at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), or other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing the wireless communication method involved in one embodiment of the present disclosure.

[0673] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray (Blu-ray) (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, or at least one of other appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0674] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, etc. In order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)), the communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-mentioned transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. may also be realized by the communication device 1004. The transmitting and receiving unit 120 (220) may also be realized by physically or logically separating the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0675] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that performs output to the outside (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0676] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between the devices.

[0677] In addition, the base station 10 and the user terminal 20 may also be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA), and the hardware may be used to implement a part or all of each functional block. For example, the processor 1001 may also be implemented using at least one of these hardware.

[0678] (Variation)

[0679] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may also be replaced with terms having the same or similar meanings. For example, channels, code elements, and signals (signals or signaling) may be rewritten one another. In addition, a signal may also be a message. A reference signal may also be referred to as RS, and may also be referred to as a pilot, a pilot signal, etc. depending on the applied standard. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0680] A radio frame may also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) constituting a radio frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) that is not dependent on a parameter set (numerology).

[0681] Here, the parameter set may also be a communication parameter applied in at least one of the transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of the subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, wireless frame structure, specific filter processing performed by the transmitter and receiver in the frequency domain, specific windowing processing performed by the transmitter and receiver in the time domain, etc.

[0682] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0683] A time slot may also contain multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of a smaller number of symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0684] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective names. In addition, time units such as frames, subframes, time slots, mini-time slots, and symbols in the present disclosure may also be replaced with each other.

[0685] For example, a subframe may be referred to as a TTI, a plurality of consecutive subframes may be referred to as a TTI, and a time slot or a mini time slot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI may be referred to as a time slot, a mini time slot, etc. instead of a subframe.

[0686] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited to this.

[0687] TTI can also be a transmission time unit for a data packet (transport block), code block, code word, etc. that has been channel-coded, and can also be a processing unit for scheduling, link adaptation, etc. In addition, when TTI is given, the time interval (for example, the number of symbols) to which a transport block, code block, code word, etc. is actually mapped can also be shorter than the TTI.

[0688] In addition, when a time slot or a mini time slot is called a TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) may also be the minimum time unit of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling may also be controlled.

[0689] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0690] In addition, a long TTI (eg, normal TTI, subframe, etc.) may be rewritten as a TTI having a time length exceeding 1 ms, and a short TTI (eg, shortened TTI, etc.) may be rewritten as a TTI having a TTI length shorter than that of a long TTI and longer than 1 ms.

[0691] Resource Block (RB) is a resource allocation unit in the time domain and frequency domain, and may also include one or more consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB may also be the same regardless of the parameter set, for example, it may be 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0692] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks, respectively.

[0693] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a group / set / pair of PRB / RB, etc.

[0694] In addition, a resource block may be composed of one or more resource elements (RE). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0695] Bandwidth Part (BWP) (also referred to as partial bandwidth, etc.) can also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, common RBs can also be identified by the index of the RB based on the common reference point of the carrier. PRBs can also be defined in a BWP and numbered within the BWP.

[0696] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured in one carrier.

[0697] At least one of the set BWPs may be activated, and the UE may not assume that a specific signal / channel is transmitted or received outside the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be rewritten as "BWP".

[0698] In addition, the above-mentioned structures such as radio frames, subframes, time slots, mini-time slots and symbols are only examples. For example, the number of subframes included in a radio frame, the number of time slots per subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

[0699] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may also be indicated by a specific index.

[0700] In the present disclosure, the names used for parameters, etc. are not limiting in all respects. Furthermore, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not limiting in all respects.

[0701] Information, signals, etc. described in the present disclosure may also be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0702] In addition, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0703] The input and output information, signals, etc. may be stored in a specific location (e.g., a memory), or may be managed using a management table. The input and output information, signals, etc. may be overwritten, updated, or added. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be sent to other devices.

[0704] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), high-layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB)), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0705] In addition, physical layer signaling may also be referred to as layer 1 / layer 2 (Layer 1 / Layer 2 (L1 / L2)) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, such as an RRC connection establishment (RRC Connection Setup) message, an RRC connection reconstruction (RRC Connection Reconfiguration) message, etc. In addition, MAC signaling may also be notified using, for example, a MAC control element (MACControl Element (CE)).

[0706] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0707] The determination may be made using a value represented by one bit (0 or 1), a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(eg, comparison with a specific value).

[0708] Whether software is called software, firmware, middle-ware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, program, sub-program, software module, application, software application, software package, routine, sub-routine, object, executable files, execution thread, procedure, function, etc.

[0709] In addition, software, instructions, information, etc. may also be sent and received via a transmission medium. For example, when the software is sent from a website, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0710] The terms "system" and "network" used in the present disclosure can be used interchangeably. "Network" may also refer to a device (eg, a base station) included in the network.

[0711] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmit power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", and "panel" can be used interchangeably.

[0712] In the present disclosure, terms such as "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "transmission point (TP)", "reception point (RP)", "transmission / reception point (TRP)")", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, micro cell, and pico cell.

[0713] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within the coverage area.

[0714] In the present disclosure, the base station sending information to the terminal may also be rewritten as the base station instructing the terminal to control / operate based on the information.

[0715] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” can be used interchangeably.

[0716] 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, hand set, user agent, mobile client, client or several other appropriate terms.

[0717] At least one of the base station and the mobile station may also be referred to as a transmission device, a reception device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station may be a device mounted on a moving object, a moving object body, etc.

[0718] The mobile body refers to a movable object, and the moving speed is arbitrary, and of course it also includes the situation where the mobile body stops. The mobile body includes, for example, vehicles, transport vehicles, cars, automatic two-wheeled vehicles (motorcycles), bicycles, connected cars, loading shovels, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, trolleys, rickshaws, ships (ships and other watercrafts), airplanes, rockets, artificial satellites, drones, multi-rotor aircraft, quadcopters, balloons and objects carried on them, but are not limited to these. In addition, the mobile body can also be a mobile body that drives autonomously based on operating instructions.

[0719] The mobile object may be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile object that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station may include a device that does not necessarily move when performing communication operations. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0720] Fig. 27 1 is a diagram showing an example of a vehicle according to an embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotation speed sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0721] The driving unit 41 is composed of at least one of an engine, a motor, or a combination of an engine and a motor. The steering unit 42 is composed of at least a steering wheel (also called a handlebar), and steers at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by the user.

[0722] The electronic control unit 49 is composed of a microprocessor 61, a memory (ROM, RAM) 62, and a communication port (for example, an input / output (IO) port) 63. Signals from various sensors 50-58 provided in the vehicle are input to the electronic control unit 49. The electronic control unit 49 may also be referred to as an ECU (Electronic Control Unit).

[0723] The signals from the various sensors 50-58 include a current signal from a current sensor 50 for sensing the current of the motor, a speed signal of the front wheels 46 / rear wheels 47 obtained by a speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of the shift lever 45 obtained by a shift lever sensor 57, a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58, and the like.

[0724] The information service unit 59 is composed of various devices such as a vehicle navigation system, an audio system, a speaker, a display, a television, and a radio for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 59 uses information obtained from an external device via the communication module 60 and the like to provide various information / services (for example, multimedia information / multimedia services) to the occupants of the vehicle 40.

[0725] The information service unit 59 may include input devices for accepting input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.), and may also include output devices for implementing output to the outside (e.g., display, speaker, LED light, touch panel, etc.).

[0726] The driving assistance system unit 64 is composed of various devices for providing functions for preventing accidents or reducing the driving load of the driver, such as millimeter wave radar, light detection and ranging (LiDAR), camera, positioning locator (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., high-precision (High Definition (HD))) map, autonomous vehicle (Autonomous Vehicle (AV)) map, etc.), gyroscope system (e.g., inertial measurement unit (Inertial Measurement Unit (IMU)), inertial navigation unit (Inertial Navigation System (INS)), etc.), artificial intelligence (Artificial Intelligence (AI)) chip, AI processor, and one or more ECUs for controlling these devices. In addition, the driving assistance system unit 64 sends and receives various information via the communication module 60 and realizes the driving assistance function or the autonomous driving function.

[0727] The communication module 60 can communicate with the microprocessor 61 and the components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) between the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the left and right front wheels 46, the left and right rear wheels 47, the axle 48, the microprocessor 61 and the memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58 provided in the vehicle 40 via the communication port 63.

[0728] The communication module 60 can be controlled by the microprocessor 61 of the electronic control unit 49, and is a communication device that can communicate with an external device. For example, various information is sent and received with the external device via wireless communication. The communication module 60 can be located either inside or outside the electronic control unit 49. The external device can also be, for example, the above-mentioned base station 10, user terminal 20, etc. In addition, the communication module 60 can also be, for example, at least one of the above-mentioned base station 10 and user terminal 20 (it can also function as at least one of the base station 10 and user terminal 20).

[0729] The communication module 60 may also transmit at least one of the signals from the various sensors 50-58 input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may also be referred to as an input unit that receives input. For example, the PUSCH transmitted through the communication module 60 may also include information based on the above input.

[0730] The communication module 60 receives various information (traffic information, signal information, vehicle-to-vehicle information, etc.) transmitted from an external device, and displays it to the information service unit 59 provided in the vehicle. The information service unit 59 may also be referred to as an output unit for outputting information (for example, outputting information to a display, a speaker, etc. based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0731] In addition, the communication module 60 stores various information received from the external device in the memory 62 that can be used by the microprocessor 61. The microprocessor 61 can also control the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the left and right front wheels 46, the left and right rear wheels 47, the axle 48, and various sensors 50-58 of the vehicle 40 based on the information stored in the memory 62.

[0732] In addition, the base station in the present disclosure may also be rewritten as a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple user terminals (for example, it may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be set as a structure in which the user terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" may also be rewritten as terms corresponding to inter-terminal communication (for example, "sidelink"). For example, uplink channels, downlink channels, etc. may also be rewritten as sidelink channels.

[0733] Likewise, the user terminal in the present disclosure may be rewritten as a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0734] In the present disclosure, the actions are assumed to be performed by the base station, and sometimes by its upper node depending on the situation. Obviously, in a network including one or more network nodes having a base station, various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, Mobility Management Entity (MME)), Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0735] The various methods / implementations described in this disclosure may be used alone or in combination, and may be used in a switched manner as the method is executed. In addition, the processing procedures, timings, flow charts, etc. of the various methods / implementations described in this disclosure may be reversed in order as long as they are not contradictory. For example, for the method described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0736] The various modes / implementations described in the present disclosure may be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems based on these enhancements, revisions, productions, or regulations. In addition, multiple systems may be combined (for example, LTE or LTE-A, combination with 5G, etc.) for application.

[0737] The phrase “based on” used in the present disclosure does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on”.

[0738] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not fully define the amount or order of these elements. These terms can be used in this disclosure as a convenient method to distinguish between two or more elements. Therefore, reference to the first and second elements does not mean that only two elements can be used or that the first element must take precedence over the second element in some form.

[0739] The term "determining" used in this disclosure may include a variety of actions. For example, "determining" may also refer to situations where judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database or other data structure), ascertaining, etc. are considered to be "determining".

[0740] In addition, “judgment (decision)” may also refer to situations where receiving (e.g., receiving information), transmitting (e.g., sending information), input (input), output (output), accessing (e.g., accessing data in a memory), etc. are regarded as making a “judgment (decision)”.

[0741] In addition, "judgment (decision)" can also be regarded as a situation where resolving, selecting, choosing, establishing, comparing, etc. are regarded as "judgment (decision)". That is, "judgment (decision)" can also be regarded as a situation where some actions are regarded as "judgment (decision)".

[0742] In addition, "judge (decide)" can also be rewritten as "assuming (assuming)", "expecting (expecting)", "considering (considering)" and so on.

[0743] The “maximum transmit power” described in the present disclosure may refer to the maximum value of the transmit power, the nominal maximum transmit power (the nominal UE maximum transmit power), or the rated maximum transmit power (the rated maximum transmit power).

[0744] The terms "connected", "coupled", or all their variations used in this disclosure refer to all direct or indirect connections or combinations between two or more elements, and may include the situation where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be physical, logical, or a combination thereof. For example, "connection" may also be rewritten as "access".

[0745] In the present disclosure, when two elements are connected, it is possible to consider being "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc. as several non-limiting and non-inclusive examples.

[0746] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same manner as "different".

[0747] When the terms “include,” “including,” and variations thereof are used in the present disclosure, these terms have an inclusive meaning, similar to the term “comprising.” Furthermore, the term “or” used in the present disclosure does not have an exclusive OR meaning.

[0748] In the present disclosure, when an article is added by translation like a, an, and the in English, for example, the present disclosure may also include a case where the noun following the article is in plural form.

[0749] In the present disclosure, "below", "less than", "above", "more than", "equal to", etc. can also be replaced by each other. In addition, in the present disclosure, sentences meaning "good", "bad", "big", "small", "high", "low", "early", "late", "wide", "narrow", etc. can also be replaced by each other without being limited to the original degree, comparative degree and superlative degree. In addition, in the present disclosure, sentences meaning "good", "bad", "big", "small", "high", "low", "early", "late", "wide", "narrow", etc. can also be replaced by each other as expressions attached with "ith" (i is an arbitrary integer) without being limited to the original degree, comparative degree and superlative degree (for example, "highest" can also be replaced by "i-th highest").

[0750] In the present disclosure, “of,” “for,” “regarding,” “related to,” “associated with,” etc. may also be replaced by each other.

[0751] The invention involved in the present disclosure is described in detail above, but it is obvious to those skilled in the art that the invention involved in the present disclosure is not limited to the embodiments described in the present disclosure. The invention involved in the present disclosure can be implemented as a modified and altered mode without departing from the gist and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of illustrative description and does not have any limiting meaning on the invention involved in the present disclosure.

Claims

1. A terminal having: a receiving unit, receiving information related to a random access procedure including a plurality of iterations of message 1 and a plurality of iterations of message 3; and The control unit determines one or more second beams used in the multiple repetitions of the message 3 based on the information and based on one or more first beams used in the multiple repetitions of the message 1.

2. The terminal according to claim 1, wherein: The control unit determines the one or more second beams from the one or more first beams.

3. The terminal according to claim 1, wherein: One random access response is transmitted for a plurality of repetitions of the message 1.

4. The terminal according to claim 1, wherein: One random access response is transmitted for each of the plurality of iterations of the message 1 .

5. A wireless communication method, which is a wireless communication method of a terminal, comprising: The step of receiving information related to a random access procedure including a plurality of iterations of message 1 and a plurality of iterations of message 3; and A step of determining one or more second beams used in multiple iterations of the message 3 based on the information and based on one or more first beams used in multiple iterations of the message 1.

6. A base station, comprising: a transmitting unit, transmitting information related to a random access procedure including a plurality of iterations of message 1 and a plurality of iterations of message 3; and The control unit determines one or more second beams used in the multiple repetitions of the message 3 based on the information and based on one or more first beams used in the multiple repetitions of the message 1.

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