Apparatus and method for performing prach repeated transmissions by using different beams in wireless communication system

Abstract

According to various embodiments of the present disclosure, provided is a method performed by a user equipment (UE), the method comprising the steps of: receiving, from a base station (BS), configuration information related to a random access channel (RACH) resource for a random access (RA) procedure, and one or more repetition number sets including a plurality of repetition numbers for physical random access channel (PRACH) repeated transmissions; on the basis of the configuration information, determining whether one repetition number set from among the one or more repetition number sets, one repetition number from among a plurality of repetition numbers included in the repetition number set, and the PRACH repeated transmissions are based on different transmission beams or based on one same transmission beam; and performing, by using a resource, PRACH repeated transmissions corresponding to a repetition number determined on the basis of different transmission beams or the same transmission beam, wherein the different transmission beams are associated with different synchronization signal blocks (SSBs) or different reference signals (RSs), and the same transmission beam is associated with one SSB or one RS.

Description

Device and method for performing PRACH repetitive transmission using different beams in a wireless communication system

[0001] The present disclosure relates to a wireless communication system. Specifically, the present disclosure relates to a device and method for performing PRACH repetitive transmission using different beams in a wireless communication system.

[0002]

[0003] In the Rel-18 coverage enhancement of the 3GPP standard specification, the RO group was introduced for PRACH repetition, and it was defined that only ROs (random access channel occasions, RACH Occasions) located at the same frequency are used to form an RO group (RACH Occasion group).

[0004] Additionally, in terms of increasing PRACH coverage, an RO group (i.e., a set of valid ROs) was formed using only ROs associated with the same SSB (synchronization signal block) beam index. Meanwhile, PRACH repetition using ROs associated with different SSB beam indices was also discussed but not introduced. Therefore, if PRACH repetition using ROs associated with different SSB beam indices is introduced in a future release of the 3GPP standard specification (e.g., Rel-19), it may be necessary to form an RO group using a method different from the currently introduced method.

[0005] Therefore, in this specification, we propose the necessary UE / base station operations when an RO group for PRACH repetition is configured to include multiple ROs associated with different SSB beam indices. Meanwhile, the proposed method and embodiments mentioned in this specification mainly target PRACH repetition using multiple ROs associated with different SSB beam indices, but can also be applied to PRACH repetition using multiple ROs associated with the same SSB beam indices, and can also be applied to PRACH repetition consisting of some ROs associated with the same SSB beam indices and some ROs associated with different SSB beam indices. Meanwhile, the repeated PRACH transmission using the same TX (transmission) beam (or different TX beam) mentioned in this specification has the same meaning as the repeated PRACH transmission using an RO group consisting of ROs associated with the same SSB beam indices (or different SSB beam indices). In addition, the Tx beam direction of the UE mentioned in this specification has the same meaning as the spatial filter of the UE. In addition, the RO group mentioned in this specification is a set of 3GPP standard specifications. valid PRACH occasions has the same meaning as the expression.

[0006]

[0007] To solve the above-described problem, the present disclosure provides an apparatus and method for performing PRACH repetitive transmission using different beams in a wireless communication system.

[0008] The technical problems to be achieved in the present disclosure are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by a person having ordinary skill in the technical field to which the present disclosure belongs from the description below.

[0009]

[0010] According to various embodiments of the present disclosure, a method performed by a user equipment (UE) comprises the steps of: receiving, from a base station (BS), configuration information related to a random access channel (RACH) resource for a random access (RA) procedure, one or more repetition number sets including a plurality of repetition numbers for physical random access channel (PRACH) repeated transmissions; determining, based on the configuration information, one repetition number set of the one or more repetition number sets, one repetition number of the plurality of repetition numbers included in the repetition number set, and whether the PRACH repeated transmissions are based on different transmission beams or on a same transmission beam; A method is provided, comprising: performing the PRACH repeated transmissions corresponding to the determined number of repetitions based on the different transmission beams or the same transmission beam using the RACH resource, wherein the different transmission beams are associated with different SSBs (synchronization signal blocks) or different RSs (reference signals), and the same transmission beam is associated with one SSB or one RS.

[0011] According to various embodiments of the present disclosure, a method performed by a base station (BS) comprises the steps of: transmitting, to a user equipment (UE), configuration information related to a random access channel (RACH) resource for a random access (RA) procedure, one or more repetition number sets including a plurality of repetition numbers for physical random access channel (PRACH) repeated transmissions; and, based on the configuration information, determining whether one of the one or more repetition number sets, one of the plurality of repetition numbers included in the repetition number set, and whether the PRACH repeated transmissions are based on different transmission beams or on a same transmission beam; A method is provided, comprising: receiving, from the terminal, the PRACH repeated transmissions corresponding to the determined number of repetitions based on the different transmission beams or the same transmission beam using the RACH resource, wherein the different transmission beams are associated with different synchronization signal blocks (SSBs) or different reference signals (RSs), and the same transmission beam is associated with one SSB or one RS.

[0012] According to various embodiments of the present disclosure, a user equipment (UE) is provided, comprising: a transceiver; at least one processor; and at least one memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations, wherein the operations include all steps of a method of operating the UE according to various embodiments of the present disclosure.

[0013] According to various embodiments of the present disclosure, a base station (BS) is provided, comprising a transceiver, at least one processor, and at least one memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations, wherein the operations include all steps of a method of operating the BS according to various embodiments of the present disclosure.

[0014] According to various embodiments of the present disclosure, a control device for controlling a user equipment (UE) is provided, comprising at least one processor and at least one memory operably connected to the at least one processor, wherein the at least one memory stores instructions for performing operations based on being executed by the at least one processor, wherein the operations include all steps of a method of operating the UE according to various embodiments of the present disclosure.

[0015] According to various embodiments of the present disclosure, a control device for controlling a base station (BS) is provided, comprising at least one processor and at least one memory operably connected to the at least one processor, wherein the at least one memory stores instructions for performing operations based on being executed by the at least one processor, wherein the operations include all steps of a method of operating a base station according to various embodiments of the present disclosure.

[0016] According to various embodiments of the present disclosure, there is provided one or more non-transitory computer-readable media storing one or more commands, wherein the one or more commands perform operations based on being executed by one or more processors, the operations including all steps of a method of operating a terminal according to various embodiments of the present disclosure.

[0017] According to various embodiments of the present disclosure, there is provided one or more non-transitory computer-readable media storing one or more commands, wherein the one or more commands, when executed by one or more processors, perform operations, the operations including all steps of a method of operating a base station according to various embodiments of the present disclosure.

[0018]

[0019] To solve the above-described problem, the present disclosure can provide a device and method for performing PRACH repeated transmission using different beams in a wireless communication system.

[0020]

[0021] The accompanying drawings are intended to aid in understanding the present disclosure and, together with detailed descriptions, may provide embodiments of the present disclosure. However, the technical features of the present disclosure are not limited to specific drawings, and the features disclosed in each drawing may be combined with each other to form new embodiments. Reference numerals in each drawing may indicate structural elements.

[0022] FIG. 1 is a diagram illustrating an example of physical channels used in a system applicable to the present disclosure and a general signal transmission method using the same.

[0023] FIG. 2 is a diagram illustrating an example of a wireless frame structure used in a system applicable to the present disclosure.

[0024] FIG. 3 is a drawing illustrating an example of a slot structure used in a system applicable to the present disclosure.

[0025] FIG. 4 is a diagram illustrating an example of a slot structure of a wireless frame used in a system applicable to the present disclosure.

[0026] FIG. 5 is a diagram illustrating an example of RO group determination in a system applicable to the present disclosure.

[0027] FIG. 6 is a diagram illustrating an example of RO group determination in a system applicable to the present disclosure.

[0028] FIG. 7 is a diagram illustrating an example of the operation process of a terminal in a system applicable to the present disclosure.

[0029] FIG. 8 is a diagram illustrating an example of an operation process of a base station in a system applicable to the present disclosure.

[0030] FIG. 9 is a drawing showing an example of the structure of a first device and a second device in a system applicable to the present disclosure.

[0031]

[0032] In various embodiments of the present disclosure, “A or B” may mean “only A,” “only B,” or “both A and B.” In other words, in various embodiments of the present disclosure, “A or B” may be interpreted as “A and / or B.” For example, in various embodiments of the present disclosure, “A, B or C” may mean “only A,” “only B,” “only C,” or “any combination of A, B and C.”

[0033] In various embodiments of the present disclosure, a slash ( / ) or a comma may mean "and / or." For example, "A / B" may mean "A and / or B." Accordingly, "A / B" may mean "only A," "only B," or "both A and B." For example, "A, B, C" may mean "A, B, or C."

[0034] In various embodiments of the present disclosure, “at least one of A and B” may mean “only A,” “only B,” or “both A and B.” Furthermore, in various embodiments of the present disclosure, the expressions “at least one of A or B” or “at least one of A and / or B” may be interpreted as equivalent to “at least one of A and B.”

[0035] Additionally, in various embodiments of the present disclosure, “at least one of A, B and C” can mean “only A,” “only B,” “only C,” or “any combination of A, B and C.” Additionally, “at least one of A, B or C” or “at least one of A, B and / or C” can mean “at least one of A, B and C.”

[0036] Additionally, parentheses used in various embodiments of the present disclosure may mean "for example." Specifically, when indicated as "control information (PDCCH)", "PDCCH" may be proposed as an example of "control information." In other words, "control information" in various embodiments of the present disclosure is not limited to "PDCCH", and "PDDCH" may be proposed as an example of "control information." Furthermore, even when indicated as "control information (i.e., PDCCH)", "PDCCH" may be proposed as an example of "control information."

[0037] Technical features individually described in a single drawing in various embodiments of the present disclosure may be implemented individually or simultaneously.

[0038]

[0039] Common signal transmission methods in 3GPP

[0040] Physical channels and general signal transmission

[0041] FIG. 1 is a diagram illustrating an example of physical channels used in a system applicable to the present disclosure and a general signal transmission method using these channels. Specifically, FIG. 1 illustrates physical channels used in a 3GPP system and general signal transmission.

[0042] Figure 1 illustrates the physical channels and typical signal transmission used in the 3GPP system. In a wireless communication system, a terminal receives information from a base station via the downlink (DL), and the terminal transmits information to the base station via the uplink (UL). The information transmitted and received between the base station and the terminal includes data and various control information, and various physical channels exist depending on the type and purpose of the information they transmit and receive.

[0043] When a terminal is powered on again from a powered-off state or newly enters a cell, it performs an initial cell search operation, such as synchronizing with the base station (S11). To this end, the terminal receives the PSCH (Primary Synchronization Channel) and SSCH (Secondary Synchronization Channel) from the base station to synchronize with the base station and obtain information such as the cell ID (cell identity). In addition, the terminal can obtain broadcast information within the cell by receiving the PBCH (Physical Broadcast Channel) from the base station. In addition, the terminal can receive the DL RS (Downlink Reference Signal) during the initial cell search phase to check the downlink channel status.

[0044] A terminal that has completed initial cell search can obtain more specific system information by receiving a PDCCH (Physical Downlink Control Channel) and a corresponding PDSCH (Physical Downlink Control Channel) (S12).

[0045] Thereafter, the terminal may perform a random access procedure to complete connection to the base station (S13-S16). Specifically, the terminal may transmit a preamble via a physical random access channel (PRACH) (S13) and receive a random access response (RAR) for the preamble via a physical downlink control channel (PDCCH) and a corresponding PDSCH (S14). Thereafter, the terminal may transmit a physical uplink shared channel (PUSCH) using scheduling information in the RAR (S15) and perform a contention resolution procedure such as a PDCCH and a corresponding PDSCH (S16).

[0046] A terminal that has performed the above-described procedure can then perform PDCCH / PDSCH reception (S17) and PUSCH / PUCCH (Physical Uplink Control Channel) transmission (S18) as general uplink / downlink signal transmission procedures. Control information that the terminal transmits to the base station is referred to as UCI (Uplink Control Information). UCI includes HARQ ACK / NACK (Hybrid Automatic Repeat and reQuest Acknowledgement / Negative-ACK), SR (Scheduling Request), CSI (Channel State Information), etc. CSI includes CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), RI (Rank Indication), etc. UCI is generally transmitted through PUCCH, but can be transmitted through PUSCH when control information and data must be transmitted simultaneously. In addition, the terminal can aperiodically transmit UCI through PUSCH according to a request / instruction of the network.

[0047]

[0048] OFDM (Orthogonal Frequency Division Multiplexing) Numerology

[0049] The new RAT system uses OFDM transmission scheme or a similar transmission scheme. The new RAT system may follow OFDM parameters different from those of LTE. Alternatively, the new RAT system may follow the existing LTE / LTE-A numerology but have a larger system bandwidth (e.g., 100 MHz). Alternatively, a single cell may support multiple numerologies. That is, UEs operating under different numerologies can coexist within a single cell.

[0050]

[0051] Radio frame structure

[0052] FIG. 2 is a diagram illustrating an example of the structure of a wireless frame used in a system applicable to the present disclosure.

[0053] In NR, uplink and downlink transmissions are organized into frames. A radio frame is 10 ms long and is defined by two 5 ms half-frames (HF). Each half-frame is defined by five 1 ms subframes (SF). A subframe is divided into one or more slots, and the number of slots in a subframe depends on the subcarrier spacing (SCS). Each slot contains 12 or 14 OFDM(A) symbols, depending on the cyclic prefix (CP). When a regular CP is used, each slot contains 14 symbols. When an extended CP is used, each slot contains 12 symbols. Here, the symbols can include OFDM symbols (or CP-OFDM symbols), SC-FDMA symbols (or DFT-s-OFDM symbols).

[0054] Table 1 illustrates that when CP is normally used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS.

[0055] SCS (15*2^u)N slot symb N frame,u slot N subframe,u slot 15KHz (u=0)1410130KHz (u=1)1420260KHz (u=2)14404120KHz (u=3)14808240KHz (u=4)1416016

[0056] N slot symb is the number of symbols in the slot. N frame,u slotis the number of slots in the frame. N subframe,u slot is the number of slots within a subframe.

[0057]

[0058] Table 2 illustrates that when extended CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS.

[0059] SCS (15*2^u)N slot symb N frame,u slot N subframe,u slot 60KHz (u=2)12404

[0060] NR supports multiple numerologies (or subcarrier spacings (SCS)) to support various 5G services. For example, an SCS of 15 kHz supports wide areas in traditional cellular bands; an SCS of 30 kHz / 60 kHz supports dense urban areas, lower latency, and wider carrier bandwidth; and an SCS of 60 kHz or higher supports bandwidths greater than 24.25 GHz to overcome phase noise.

[0061] The NR frequency band can be defined by two types of frequency ranges (FR1, FR2). The numerical values ​​of the frequency ranges can be changed, and for example, the two types of frequency ranges (FR1, FR2) can be as shown in Table 3 below. For convenience of explanation, among the frequency ranges used in the NR system, FR1 can mean the "sub 6 GHz range", and FR2 can mean the "above 6 GHz range" and can be called millimeter wave (mmW).

[0062] Frequency Range designationCorresponding frequency rangeSubcarrier SpacingFR1450MHz - 6000MHz15, 30, 60kHzFR224250MHz - 52600MHz60, 120, 240kHz

[0063] As described above, the numerical value of the frequency range of the NR system can be changed. For example, FR1 may include a band from 410 MHz to 7125 MHz, as shown in Table 4 below. That is, FR1 may include a frequency band above 6 GHz (or 5850, 5900, 5925 MHz, etc.). For example, the frequency band above 6 GHz (or 5850, 5900, 5925 MHz, etc.) included within FR1 may include an unlicensed band. The unlicensed band may be used for various purposes, such as for vehicular communications (e.g., autonomous driving).

[0064] Frequency Range designationCorresponding frequency rangeSubcarrier SpacingFR1410MHz - 7125MHz15, 30, 60kHzFR224250MHz - 52600MHz60, 120, 240kHz

[0065] In an NR system, OFDM(A) numerologies (e.g., SCS, CP length, etc.) may be set differently between multiple cells that are merged into a single terminal. Accordingly, the (absolute time) interval of a time resource (e.g., SF, slot, or TTI) (conveniently referred to as TU (Time Unit)) consisting of the same number of symbols may be set differently between the merged cells.

[0066]

[0067] FIG. 3 is a drawing illustrating an example of a slot structure used in a system applicable to the present disclosure.

[0068] A slot contains multiple symbols in the time domain. For example, a slot contains 7 symbols for a regular CP, but 6 symbols for an extended CP. A carrier contains multiple subcarriers in the frequency domain. A Resource Block (RB) is defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. A Bandwidth Part (BWP) is defined as multiple consecutive (P)RBs in the frequency domain, and can correspond to a single numerology (e.g., SCS, CP length, etc.). A carrier can contain up to N (e.g., 5) BWPs. Data communication is performed through activated BWPs, and only one BWP can be activated for a single terminal. Each element in the resource grid is referred to as a Resource Element (RE), to which one complex symbol can be mapped.

[0069]

[0070] FIG. 4 is a diagram illustrating an example of a slot structure of a wireless frame used in a system applicable to the present disclosure.

[0071] Fig. 4 is an exemplary system, illustrating the slot structure of a frame of an NR system.

[0072] The frame structure of NR is characterized by a self-contained structure in which a DL control channel, DL or UL data, and UL control channel can all be included in a single slot unit, as shown in the example of FIG. 4. At this time, DL data scheduling information, UL data scheduling information, etc. can be transmitted in the DL control channel, and ACK / NACK information for DL ​​data, CSI information (modulation and coding scheme information, MIMO transmission-related information, etc.), scheduling requests, etc. can be transmitted in the UL control channel. In FIG. 4, a time gap for DL-to-UL or UL-to-DL switching may exist between the control region and the data region. In addition, some of DL control / DL data / UL data / UL control may not be configured within a single slot. Or, the order of each channel configuring a single slot may be different. (For example, DL control / DL data / UL control / UL data or UL control / UL data / DL control / DL data, etc.)

[0073]

[0074] PRACH (Physical Random Access Channel) repetition refers to a terminal repeatedly transmitting PRACH during a random access procedure. PRACH is the channel used by a terminal to request network access from a base station. PRACH repetition is primarily used to ensure successful signal transmission in areas with poor communication conditions or wide coverage.

[0075] 1. The purpose of PRACH Repetition is as follows:

[0076] The primary purpose of PRACH repetition is to increase the probability of signal reception. By repeatedly transmitting PRACH signals, the likelihood of at least one successful transmission increases, even when interference or noise is present on the communication path between the terminal and the base station. PRACH repetition is particularly useful in the following situations:

[0077] (1) Weak signal environment: When the signal strength is weak due to high-density buildings in the city, long distances, or indoor communication.

[0078] (2) Long distance between base station and terminal: When the terminal is far from the base station in a wide coverage area.

[0079] (3) Interference or channel quality degradation: When interference from surrounding communication signals is severe.

[0080] 2. PRACH Repetition works as follows:

[0081] (1) RA preamble transmission: When the terminal starts PRACH transmission by PDCCH or other trigger, it transmits the RA (Random Access) preamble through the PRACH channel.

[0082] (2) Repeated transmission: PRACH transmission is repeated multiple times according to the configured repetition number. The repetition number is set by the network or by the terminal considering the coverage status.

[0083] (3) Transmit Beam Usage: Multiple PRACH repetitions can be performed using different transmit beams (TX beams). This diversifies the paths the signal can take, increasing the probability of success.

[0084] (4) Reception Acknowledgement: When the base station successfully receives the PRACH signal, it responds to the signal and moves on to the next step of the random access procedure.

[0085] 3. The advantages of PRACH Repetition are as follows:

[0086] (1) Improved communication success rate: The possibility of the base station successfully receiving the PRACH signal is increased through multiple repeated transmissions.

[0087] (2) Coverage expansion: PRACH repetition allows stable network access in a wider area.

[0088] (3) Signal quality improvement: When the signal is weak or there is a lot of interference, PRACH repeated transmission helps overcome the signal quality degradation.

[0089] Therefore, PRACH repetition is an important technique for securing a stable connection with the network, and is often used together with beamforming, especially in high-frequency bands such as 5G NR.

[0090]

[0091] RO group for PRACH repetition

[0092] In the Rel-18 Coverage enhancement of the 3GPP standard specification, an RO group (RACH Occasion group) for PRACH (physical random access channel) repetition was introduced. That is, when the base station sets / indicates N repetition numbers, it was agreed that among valid ROs (random access channel occasions, RACH Occasions), ROs existing on the same frequency would be grouped into N RO groups in ascending order of time domain index. This is represented graphically as in Figs. 5 and 6. In other words, among valid ROs associated with the same beam, N ROs existing on the same frequency can be grouped into one RO group.

[0093]

[0094] FIG. 5 is a diagram illustrating an example of RO group determination in a system applicable to the present disclosure.

[0095] In the embodiment of FIG. 5, the number of repetitions is 4, the number of SSBs is 2, the number of FDMed (frequency domain multiplexed) ROs is 4, and the number of SSBs per RO is 1 / 2.

[0096]

[0097] FIG. 6 is a diagram illustrating an example of RO group determination in a system applicable to the present disclosure.

[0098] In the embodiment of FIG. 6, the number of repetitions is 4, the number of SSBs is 3, the number of FDMed ROs is 4, and the number of SSBs per RO is 1.

[0099]

[0100] PRACH mask index

[0101] The PRACH mask index is defined in the TS (technical specification) 38.212, 38.213, and 38.321 documents of the 3GPP standard specification as follows. At this time, the PRACH mask index is defined so that when the terminal indicates DCI format 1_0 for PDCCH order, it indicates a specific SSB index to be used for CFRA with the "SS / PBCH index field", and indicates the time domain index of the RO associated with the corresponding SSB index with the "PRACH Mask index field".

[0102]

[0103] (1) clause 7.3.1.2.1 of 3GPP TS 38.212

[0104] The following information is transmitted by means of the DCI format 1_0 with CRC scrambled by C-RNTI, CS-RNTI, or MCS-C-RNTI:

[0105] - DCI format identifier (Identifier for DCI formats): 1 bit

[0106] - The value of this bit field is always set to 1, indicating a DL DCI format.

[0107] - Frequency domain resource assignment bits where is given by clause 7.3.1.0

[0108] If the CRC of the DCI format 1_0 is scrambled by C-RNTI and the "Frequency domain resource assignment" field are of all ones, the DCI format 1_0 is for a random access procedure initiated by a PDCCH order, with all remaining fields set as follows:

[0109] - Random Access Preamble Index - 6 bits according to tora-PreambleIndex in Clause 5.1.2 of [8, TS38.321]

[0110] - UL / SUL indicator - 1 bit. If the value of the "Random Access Preamble index" is not all zeros and the UE is configured with supplementaryUplink in ServingCellConfig in the cell, this field indicates which UL carrier in the cell to transmit the PRACH according to Table 7.3.1.1.1-1; otherwise, this field is reserved.

[0111] - SS / PBCH index - 6 bits. If the value of the "Random Access Preamble Index" is not all zeros, this field indicates the SS / PBCH that shall be used to determine the RACH occasion for the PRACH transmission; otherwise, this field is reserved.

[0112] - PRACH Mask Index - 4 bits. If the value of the "Random Access Preamble Index" is not all zeros, this field indicates the RACH occasion associated with the SS / PBCH indicated by the "SS / PBCH index" for the PRACH transmission, according to Clause 5.1.1 of [8, TS38.321]; otherwise, this field is reserved.

[0113] - Reserved bits - 12 bits when the DCI format is monitored in the common search space for operation in a cell with shared spectrum channel access in frequency range 1 or when the DCI format is monitored in the common search space for operation in a cell in frequency range 2-2; otherwise 10 bits.

[0114]

[0115] (2) clause 8.1 of 3GPP TS 38.213

[0116] In a PRACH transmission triggered by a PDCCH command, the PRACH mask index field [5, TS 38.212] indicates a PRACH occasion for a PRACH transmission, if the value of the Random Access Preamble Index field is not 0, and these PRACH occasions are associated with the SS / PBCH block index specified by the SS / PBCH block index field of the PDCCH command. The UE sets K by cellSpecificKoffset. cell,offset If provided, PRACH occasion is T TA Assuming =0, the slot after slot n of UL BWP for PRACH transmission overlapping with the end of PDCCH command reception , where n is a slot and μ is the SCS configuration for a PRACH transmission. If a PDCCH reception for a PDCCH command includes two PDCCH candidates from two linked search space sets based on searchSpaceLinkingId as described in clause 10.1, the last symbol of the PDCCH reception is the last symbol of the PDCCH candidate that ends later. Furthermore, a PDCCH reception includes two PDCCH candidates even if the UE does not need to monitor one of the two PDCCH candidates as described in clauses 10 (except clause 10.4), 11.1, 11.1.1, and 17.2. (For a PRACH transmission by a UE triggered by a PDCCH order, the PRACH mask index field [5, TS 38.212], if the value of the random access preamble index field is not zero, indicates the PRACH occasion for the PRACH transmission where the PRACH occasions are associated with the SS / PBCH block index indicated by the SS / PBCH block index field of the PDCCH order. If the UE is provided K cell,offset bycellSpecificKoffset, the PRACH occasion is after slot where n is the slot of the UL BWP for the PRACH transmission that overlaps with the end of the PDCCH order reception assuming T TA=0, and μ is the SCS configuration for the PRACH transmission. If the PDCCH reception for the PDCCH order includes two PDCCH candidates from two linked search space sets based onsearchSpaceLinkingId, as described in clause 10.1, the last symbol of the PDCCH reception is the last symbol of the PDCCH candidate that ends later. The PDCCH reception includes the two PDCCH candidates also when the UE is not required to monitor one of the two PDCCH candidates as described in clauses 10 (except clause 10.4), 11.1, 11.1.1 and 17.2.)

[0117]

[0118] (3) 3GPP TS 38.321의 clause 7.4

[0119] 7.4 PRACH Mask Index values

[0120] 다음의 [표 5]는 3GPP TS 38.321의 표 7.4-1: PRACH 마스크 인덱스 값 (Table 7.4-1: PRACH Mask Index values)를 나타낸다.

[0121] PRACH Mask Index / msgA-SSB-SharedRO-MaskIndex / ssb-SharedRO-MaskIndexAllowed PRACH occasion(s) of SSB0All1PRACH occasion index 12PRACH occasion index 23PRACH occasion index 34PRACH occasion index 45PRACH occasion index 56PRACH occasion index 67PRACH occasion index 78PRACH occasion index 89Every even PRACH occasion10Every odd PRACH occasion11Reserved12Reserved13Reserved14Reserved15Reserved

[0122]

[0123] Composition and Method of the Invention

[0124] The contents discussed above (NR frame structure, RACH, U-Band system, full duplex operation, etc.) can be applied in combination with the methods proposed in this specification, which will be described later, or can be supplemented to clarify the technical characteristics of the methods proposed in this specification.

[0125] In addition, the methods related to the PRACH transmission occasion configuration described later are related to uplink transmission and can be equally applied to the uplink signal transmission method in the NR system (licensed band) or U-Band system (unlicensed band) or full duplex operation described above, and of course, the technical idea proposed in this specification can be modified or replaced to fit the terms, expressions, structures, etc. defined in each system so that it can be implemented in the relevant system as well.

[0126] For example, uplink transmission through methods related to the PRACH transmission occasion configuration described below can be performed in an NR system, a U-Band system, or an L-cell and / or U-cell defined in full duplex operation.

[0127] In Rel-18 coverage enhancement, RO groups were introduced for PRACH repetition, and it was defined that only ROs located at the same frequency were used to form an RO group.

[0128] Furthermore, in terms of increasing PRACH coverage, RO groups (i.e., a set of valid ROs) were formed using only ROs associated with the same SSB beam index. Meanwhile, PRACH repetition using ROs associated with different SSB beam indices was also discussed but not implemented. Therefore, if PRACH repetition using ROs associated with different SSB beam indices is introduced in a future release (e.g., Rel-19), it may be necessary to form RO groups using a method different from the currently introduced method.

[0129] Therefore, in this specification, we propose the necessary operation of a terminal / base station when an RO group for PRACH repetition is configured to include multiple ROs associated with different SSB beam indices. Meanwhile, the proposed method and embodiments mentioned in this specification mainly target PRACH repetition using multiple ROs associated with different SSB beam indices, but can also be applied to PRACH repetition using multiple ROs associated with the same SSB beam indices, and can also be applied to PRACH repetition consisting of some ROs associated with the same SSB beam indices and some ROs associated with different SSB beam indices. Meanwhile, the repeated PRACH transmission using the same TX beam (or different TX beam) mentioned in this specification has the same meaning as the repeated PRACH transmission using an RO group consisting of ROs associated with the same SSB beam indices (or different SSB beam indices). In addition, the Tx beam direction of the UE mentioned in this specification has the same meaning as the spatial filter of the UE. In addition, the RO group mentioned in this specification is a set of 3GPP standard specifications. valid PRACH occasions has the same meaning as the expression.

[0130]

[0131] 1. Higher layer signaling for PRACH repetition with different beams

[0132] When a PRACH repetition method using different TX beams is introduced, the base station needs to configure / indicate whether the RACH resource configured for PRACH repetition is a resource for a terminal using the same TX beam or a resource for a terminal using different TX beams through higher layer signaling (e.g., SIB, etc.). For example, an explicit parameter can be newly introduced into higher layer signaling (e.g., SIB, etc.) to indicate whether the RACH resource is for the same TX beam or a different TX beam. In another example, an explicit parameter can be newly introduced into higher layer signaling (e.g., SIB, etc.) to indicate whether the RACH resource is for a different TX beam (or for the same TX beam), and if the parameter is not provided in the higher layer signaling (e.g., SIB, etc.), the terminal can determine that the RACH resource is for the same TX beam (or for a different TX beam).

[0133] Meanwhile, when performing repeated PRACH transmissions using different TX beams, the link budget becomes smaller compared to when performing repeated PRACH transmissions using the same TX beam. Therefore, in terms of PRACH coverage enhancement, more repetition numbers may be required when using different TX beams. Consequently, the repetition number (or repetition number set) that the base station can configure / instruct when performing repeated PRACH transmissions using different TX beams can be set differently from the case when performing repeated PRACH transmissions using the same TX beam. For example, if the repetition number set that the base station can configure / instruct is {1, 2, 4, 8} for PRACH repetitions using the same TX beam, a repetition number set consisting of larger or equal numbers, such as {1, 3, 6, 12}, can be independently defined for PRACH repetitions using different TX beams.

[0134] Specifically, if different repetition number sets are defined between cases where PRACH repetitive transmissions are performed using different TX beams and cases where PRACH repetitive transmissions are performed using the same TX beam, the base station can implicitly configure whether the corresponding RACH resource is a resource for the same TX beam or a different TX beam using the repetition number(s) configured / indicated by higher layer signaling (e.g., SIB, etc.). That is, the terminal can determine by itself whether the corresponding RACH resource is a resource for the same TX beam or a different TX beam based on the repetition number(s) indicated by the base station.

[0135] Additionally, if the number of different SSB beam indices used by the base station in a specific cell is defined, and the terminal always wants to perform PRACH repeated transmission using different TX beams in a specific RACH attempt, the base station can set / instruct the repetition number for PRACH repeated transmission using different TX beams to be always less than or equal to the number of different SSB beam indices. That is, the terminal can expect the base station to always set / instruct the repetition number value for PRACH repeated transmission using different TX beams to be less than or equal to the number of different SSB beam indices used in the cell.

[0136]

[0137] 2. RO group determination for PRACH repetition with SSB beam indexes

[0138] In terms of resource configuration, it may be desirable to configure PRACH resources for PRACH repetition with the same beam and PRACH resources for PRACH repetition with different beams separately (e.g., at the RO level, preamble level, etc.). Otherwise, the base station must perform blind detection for the RO groups for the same beam and the RO groups for different beams, since a specific preamble within the same PRACH resource may be used for both repetition transmission techniques (i.e., the same beam or different beams), thereby increasing base station complexity.

[0139] Meanwhile, if the PRACH repetition method is introduced using ROs composed of ROs associated with different SSB beam indices, a separate method for determining RO groups composed of ROs associated with the same SSB beam index may be required. The specific method is proposed as follows.

[0140]

[0141] For single RACH attempt

[0142] In the first method, the base station can configure / indicate the number of different TX beams to be applied within a single RACH attempt. For example, the base station can configure / indicate the number of different TX beams to be used for each PRACH configuration or for each repetition number. In this case, the UE can select multiple ROs associated with different SSB beam indices as many times as the repetition number and define them as an RO group, based on the SSB-to-RO mapping configured through the PRACH configuration and / or the number of different TX beams indicated by the base station.

[0143] Another method that the base station can directly instruct is that in addition to the number of different SSB beam indices (K) to be applied within a single RACH attempt, the base station can configure / instruct a starting SSB beam index (S) and a number of SSB beam groups (M) (which can have different combinations of SSB beam indices). For example, a total of K SSB beam indices from SSB beam index S to SSB beam index S+K-1 can be SSB beam group #1, and a total of K SSB beam indices from SSB beam index S+K to SSB beam index S+2K-1 can be SSB beam group #2. Using this method, a total of M SSB beam groups can be defined. Specifically, if the base station does not provide the number of SSB beam groups (M) through higher layer signaling, the terminal can be defined to configure an SSB beam group using all SSB beam indices.

[0144] Afterwards, the K ROs associated with the K SSB beam indices can be the size of the minimum (unit) RO group, and if a repetition number (N) is additionally indicated, the N minimum (unit) RO groups can be selected and used for PRACH repeated transmission. Characteristically, the repetition number can be determined in units of (unit) RO groups. For example, if S=1 and K=4, the SSB beam group can be configured with SSB beam index {1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}, etc. In this case, if N=3 is set and the terminal selects an SSB beam group combined with SSB beam index {1, 2, 3, 4}, three (unit) RO groups configured with the corresponding SSB beam combination (i.e., {1, 2, 3, 4}) can be selected to perform PRACH repeated transmission. Alternatively, if the repetition number (N) is indicated in RO units rather than (unit) RO group units, the value can be defined to be a multiple of the K value, which is the number of different SSB beam indices associated with the (unit) RO group.

[0145] Alternatively, the base station may additionally configure / indicate the number (K) of different SSB beam indices to be applied within a single RACH attempt and whether one SSB beam index will be repeated consecutively (X) times in the RO group. For example, if the starting SSB beam index (S) = 1, the number of different SSB beam indices (K) = 2, and X = 2, then the SSB beam group may be composed of SSB beam indices {1, 1, 2, 2}, {3, 3, 4, 4}, {5, 5, 6, 6}, etc. Alternatively, the SSB beam group may be configured to be interleaved X times, so that the SSB beam group may be composed of SSB beam indices {1, 2, 1, 2}, {3, 4, 3, 4}, {5, 6, 5, 6}, etc.

[0146] A second method allows pre-defining the number of TX beams to be used for each PRACH configuration or repetition number. In this case, similar to the previous method, the terminal can define an RO group by selecting multiple ROs associated with different SSB beam indices, corresponding to the repetition number, based on pre-defined information.

[0147] The third method is a method in which the terminal implicitly sets different numbers of TX beams based on the number of different SSB beam indices used in the cell and the repetition number set / instructed by the base station. For example, if the number of different SSB beam indices used in the cell (e.g., A) is greater than or equal to the repetition number (e.g., N) set / instructed by the base station, the terminal can be defined to always use N different TX beams when configuring an RO group for PRACH repetition using different TX beams. That is, in this case, when the terminal determines ROs for an RO group, it can be defined to always select and configure ROs associated with different SSB beam indices as many as the repetition number N. On the other hand, if the number of different SSB beam indices used in the cell (e.g., A) is less than the repetition number (e.g., N) set / instructed by the base station, when the terminal configures an RO group for PRACH repetition using different TX beams, the first A may use different TX beams, and the remaining NA may wrap around in the order of the previously selected beams to reselect the corresponding TX beams. That is, in this case, when the terminal determines the RO group, the first A may select ROs associated with different SSB beam indices, and the remaining NA may wrap around in the order of the previously selected SSB beam indices to additionally select ROs associated with the corresponding SSB beam indices.

[0148] Specifically, when the terminal determines the RO group, it can be defined to use same frequency ROs of different time instances (e.g., ROs with the same f_id, or ROs with the same starting RB index). That is, among the ROs in the same frequency, the RO group can be determined by selecting ROs that exist earlier in time among the ROs associated with different SSB beam indices. At this time, when selecting ROs associated with different SSB beam indices in one RO group, it can be defined that other ROs associated with the same SSB beam index as the SSB beam index associated with the RO already selected for a specific RO group cannot be included in the RO group. In the RO group determination, the first valid RO of the first RO group for each frequency position can be defined according to a specific time period (e.g., one or multiple association pattern period(s)) determined through a method defined in the existing 3GPP standard specification.

[0149] Additionally, if the PRACH resources for PRACH repetition with different beams are allocated with RO levels that are different from those for PRACH repetition with the same beam, a specific RO determined as an RO group for the same TX beam can be defined not to be determined as an RO group for different TX beams. On the other hand, if the PRACH resources for PRACH repetition with different beams are allocated with ROs that are shared with the PRACH resources for PRACH repetition with the same beam and are differentiated by preamble levels, a specific RO determined as an RO group for the same TX beam can also be determined as an RO group for different TX beams, but the RO groups for the same TX beam and the RO groups for different TX beams are defined with different preamble index groups. That is, if a specific RO is included in both the RO group for the same TX beam and the RO group for different TX beams, the preamble index groups used for each RO group can be defined not to overlap with each other.

[0150]

[0151] For different RACH attempts

[0152] When a UE performs repeated PRACH transmissions using different TX beams in a specific RACH attempt and does not receive an RAR from the base station, it is necessary to define whether the number of different TX beams will be kept the same as in the previous RACH attempt or changed when the UE performs repeated PRACH transmissions in the subsequent RACH attempt.

[0153] First, we can consider a method to set the same number of different TX beams used for each RACH attempt. That is, we can define that a specific UE maintains the same number of different TX beams used in the initial RACH attempt until the end of the corresponding RACH procedure. Furthermore, when performing repeated PRACH transmissions using different TX beams in a specific cell as well as multiple RACH attempts within a specific RACH procedure, we can define that the different number of TX beams is maintained at a specific value set / instructed by the base station (or determined for the initial RO group (among ROs in a specific frequency band) during RO group determination). In this case, when the UE determines an RO group using ROs associated with different SSB bean indices based on the information received from the base station, we can define that each RO group always includes the same number of ROs associated with different SSB beam indices.

[0154] Alternatively, one could consider defining the number of TX beams used for each RACH attempt to be different. For example, if a specific UE repeatedly transmits PRACH using different TX beams in the first RACH attempt and then fails to receive an RAR from the base station, it can be defined that the UE will repeatedly transmit PRACH using a different number of TX beams in the subsequent RACH attempt. In other words, if the first RACH attempt uses two different TX beams to transmit four PRACHs (twice per TX beam), the next RACH attempt can use four different TX beams to transmit four PRACHs (once per TX beam). In cases where the number of TX beams can vary, the base station can configure / indicate the corresponding values ​​through higher layer signaling (e.g., SIB), or they can be defined and used in advance in the 3GPP standard specification. Defining it this way has the advantage of increasing the probability that the terminal will be instructed to the best beam direction by including more TX beams in the RACH re-attempt.

[0155]

[0156] Meanwhile, apart from defining the number of different TX beams between specific RACH attempts, it is necessary to define whether the combination of different TX beam indices should be kept the same as in the previous RACH attempt or changed.

[0157] First, a method of setting the combination of different TX beam indices used for each RACH attempt to be the same can be considered. This method can be used when the number of SSB beam indices used in the corresponding cell is less than or equal to the repetition number set / indicated by the base station. Specifically, the combination of TX beam indices can be determined by the UE implicitly determining the RO group by selecting ROs associated with different SSB beam indices by the repetition number, starting from the first valid RO of a specific time period. In this case, the combination of different TX beam indices used by a specific UE in the initial RACH attempt can be defined to be maintained until the end of the corresponding RACH procedure. Furthermore, when performing repeated PRACH transmissions using different TX beams in a specific cell as well as multiple RACH attempts within a specific RACH procedure, the combination of different TX beam indices can be defined to be maintained as a specific combination set / indicated by the base station (or determined in advance, or determined through implicit RO group determination). Even in this case, when the terminal determines an RO group of ROs associated with different SSB beam indices based on information received from the base station, it can be defined to include ROs associated with different SSB beam indices so that different SSB beam indices are equally combined within each RO group.

[0158] Alternatively, one could consider defining different combinations of TX beam indices for each RACH attempt. Specifically, this approach can be used when the number of SSB beam indices used in a given cell is greater than the repetition number configured / indicated by the base station. For example, if a specific UE performs repeated PRACH transmissions using a combination of TX beam indices in the initial RACH attempt and then fails to receive an RAR from the base station, the UE can repeat PRACH transmissions using a different combination of TX beam indices in the subsequent RACH attempt. Specifically, TX beam indices not used in the previous RACH attempt can be defined to be preferentially selected for the current RACH attempt. If there are no more unused TX beam indices, the TX beam index used in the previous RACH attempt can be reused. This definition has the advantage of increasing the probability of the UE receiving the best beam direction since the RACH re-attempt can include other TX beam indices not previously selected. When set this way, when selecting an RO group in a RACH re-attempt situation, it can be defined that the terminal selects an RO group with many ROs associated with an SSB beam index that was not included in the previous RACH attempt.

[0159]

[0160] The above proposed methods can be applied to the terminal to implicitly determine the RO group based on the information provided by the base station (e.g., SSB-to-RO mapping, # of SSB beam indices, # of PRACH repetitions, number of TX beams, TX beam combination method, etc.). For example, when forming an RO group, it can be defined so that the ROs associated with each SSB beam index are selected in the order of the SSB beam indices used in the corresponding cell, equal to the repetition number. If, when forming a specific RO group, the ROs associated with the last SSB beam index are added but the number of ROs equal to the repetition number is not filled, the RO group can be formed by wrapping around the SSB beam index and adding the ROs associated with the first SSB beam index again. In addition, the RO associated with the SSB beam index immediately following the SSB beam index associated with the last RO of the previous RO group can be defined so as to be the first RO of the next RO group.

[0161]

[0162] Additionally, a method may be considered in which the base station explicitly configures / indicates whether or not to maintain different numbers of TX beams among multiple RACH attempts through higher layer signaling, and a method may also be considered in which the base station explicitly configures / indicates whether or not to maintain different combinations of TX beam indices among multiple RACH attempts through higher layer signaling. Specifically, if a parameter that provides such information is not provided, it can be defined that different numbers of TX beams are maintained among multiple RACH attempts, or it can be defined that different combinations of TX beam indices are maintained among multiple RACH attempts.

[0163]

[0164] 3. PRACH repetition with different UE TX beams using multiple ROs associated with the same SSB beam index

[0165] Although multiple ROs associated with the same SSB beam index are used, a PRACH repetition method using different TX beams can be considered by slightly changing the UE TX beam when the actual terminal transmits. That is, in this case, the process of determining RO groups using multiple ROs associated with the same SSB beam index defined in the 3GPP standard specification can be reused as is. In this case, the operation of changing the UE TX beam and transmitting can be supported by the terminal implementation, and the base station can receive PRACH preambles without knowing whether the terminal transmits while changing the UE TX beam or not and can operate under the assumption that the terminal initially transmitted using the same TX beam. In this way, the terminal can operate regardless of its TX beam generation capability.

[0166] At this time, an operation may be considered in which the base station configures / instructs a specific number of ROs within the RO group through higher layer signaling, and defines the corresponding number of ROs as a subset of the RO group. At this time, the ROs included in the subset may be defined so that the terminal (even if it is a terminal that can transmit by slightly changing the TX beam) uses the same TX beam. For example, if the subset includes 1 RO, the terminal can perform PRACH repetition by slightly changing the Tx beam in each RO included in the RO group, and can perform PRACH repetition using the same Tx beam in some or all ROs (without changing the TX beam). As another example, when there are two or more ROs included in the subset, PRACH repetitions can be performed using the same Tx beam (without changing the TX beam) in the ROs included in the subset, and PRACH repetitions can be performed using the same Tx beam (without changing the TX beam) among the ROs included in the other subset while using a different Tx beam from the previous subset (or using the same TX beam). Characteristically, the number of ROs constituting the subset can be defined to be indicated by a divisor of the repetition number. For example, when the repetition number is 2, one of {1, 2} can be set / indicated as the subset, when the repetition number is 4, one of {1, 2, 4} can be set / indicated as the subset, and when the repetition number is 8, one of {1, 2, 4, 8} can be set / indicated as the subset.

[0167] When defined as such, the base station can be defined to select the best beam among the subsets belonging to the RO group and indicate the subset index to the terminal through a specific field (or reserved field) of the RAR UL grant (or DCI format 0_0 with TC-RNTI). At this time, the bit width of the corresponding indication field is first determined, and the number of subsets can be determined by the number of indices that can be expressed with the corresponding bit width, and the number of ROs constituting the subset can be determined accordingly. Alternatively, the base station can indicate the number of ROs included in the subset, and when the total number of subsets is determined according to the repetition number, the bit width of the indication field is determined, and then the subset index can be mapped to each state. Alternatively, the base station can indicate the number of subsets instead of indicating the number of ROs included in the subset. (If the number of subsets is indicated, the number of ROs included in the subset can be determined according to the repetition number.) Afterwards, the bit width of the indication field is determined accordingly, and then the subset index can be mapped to each state. Characteristically, the positions of ROs that constitute a subset in an RO group can be defined as temporally consecutive ROs or as temporally interleaved.

[0168]

[0169] 4. PRACH repetition with different SSB beam indexes using multiple RO groups

[0170] Currently, we can consider a method in which a UE performs repeated PRACH transmissions using multiple ROs associated with the same SSB beam index defined in the 3GPP standard specification to determine an RO group, and then uses multiple different RO groups associated with different SSB beam indices. That is, in addition to the repetition factor (N) used for repeated PRACH transmission using the same beam, the base station can consider configuring / indicating the # of different SSB beams for repetition (D) through higher layer signaling. Ultimately, if the base station configures / indicates in this way, the RO group used for N repeated transmissions using the same SSB beam index can be defined, and a total of N*D PRACH preambles can be transmitted using all D RO groups corresponding to different SSB beam indices. At this time, the preamble index used for the N*D PRACH transmissions can be set to be the same. For example, when N=2 and D=2, a total of 4 PRACHs may be used for repeated transmission using ROs corresponding to SSB beam index {a, b, a, b}, or a total of 4 PRACHs may be used for repeated transmission using ROs corresponding to SSB beam index {a, a, b, b}. This can be determined depending on the order in which ROs are arranged in a specific frequency resource.

[0171] Since it is known in advance that N*D PRACH transmissions will be performed between the terminal and the base station, the terminal can understand and operate that the RAR window starts after the last N*D PRACH transmission is finished (i.e., after the last OFDM symbol of the last RO). In addition, the base station can select the best SSB beam index of one of the D RO groups and instruct the terminal, and this can be set / instructed using D different RA-RNTI values. That is, if D different RA-RNTI values ​​associated with the last ROs of the RO group corresponding to each SSB beam index are defined, and the base station selects one of them and uses it for CRC scrambling of the PDCCH that schedules the RAR UL grant, the terminal can set / instruct the best SSB beam index through blind detection (decoding) using D different RA-RNTIs. Thereafter, the terminal can be configured to transmit using the best SSB beam index set / instructed by the base station when transmitting Msg3 PUSCH.

[0172] Specifically, the # of different SSB beam for repetition (D) value can be set / indicated when the repetition factor (N) is 2 or more. In addition, when the repetition factor (N) is 2 or more, but the # of different SSB beam for repetition (D) value is not provided or is 1, it can be defined to transmit repeatedly N times using ROs associated with the same SSB beam index as in the existing operation.

[0173] Meanwhile, the different SSB beam indices may be defined for different TRP indices set within the cell. In this way, the terminal can transmit using different TX beams when performing PRACH repetition transmissions to different TRPs and can be configured to expect RARs from different TRPs.

[0174]

[0175] 5. RO group selection and TX power determination

[0176] As in the above proposed methods, when RO groups (or SSB beam groups) composed of different SSB beam indices are defined (or when a terminal can transmit TX beams differently within a RO group composed of the same SSB beam index), a method for determining which RO group (or SSB beam group) the terminal will select can be considered. For example, the terminal can be defined to select the RO group (or SSB beam group) having the best RSRP of the best (or worst) SSB beam index within each RO group (or SSB beam group). Alternatively, the terminal can be defined to select the RO group (or SSB beam group) having the best average RSRP of all SSB beam indices within each RO group (or SSB beam group).

[0177] Meanwhile, when a terminal performs multiple PRACH transmissions by selecting a specific RO group (or SSB beam group), a method for determining the PRACH TX power value to be set for each RO associated with different SSB beam indices can be considered. First, as an example of a method for setting the TX power to be the same between repeated PRACH transmissions, the terminal can be defined to set the PRACH TX power of all ROs within each RO group (or SSB beam group) to be the same based on the pathloss value of the best (or worst) SSB beam index within the group. Alternatively, the PRACH TX power of all ROs within each RO group (or SSB beam group) can be defined to be the same based on the average pathloss value of all SSB beam indices within the group. In the above, the best SSB beam index may be the SSB beam index with the largest RSRP (or the smallest pathloss) among the SSB beam indices associated with the ROs in the RO group, and conversely, the worst SSB beam index may be the SSB beam index with the smallest RSRP (or the largest pathloss) among the SSB beam indices associated with the ROs in the RO group.

[0178] Next, as an example of a method for independently setting TX power between PRACH repeated transmissions, the terminal may independently set PRACH TX power for each RO associated with each SSB beam index based on the pathloss value of each SSB beam index within each RO group (or SSB beam group), and define a timing gap between adjacent ROs to take power transmission loss into account between PRACH transmissions.

[0179]

[0180] The above-mentioned proposed PRACH repetition methods can be applied to both CFRA and / or CBRA. In addition, the above-mentioned RO refers to a valid RO, and a valid RO can be defined to follow the method defined in the existing 3GPP standard specification. In addition, the above-mentioned proposed method can be configured / applied to other UL signals / channels such as PUSCH / PUCCH. The above-mentioned technology can also be applied to systems that perform full duplex operation, such as SBFD / SSFD. In addition, it is clear that the examples of the proposed method described above can also be included as one of the implementation methods of the present specification, and thus can be considered as a type of proposed method. In addition, the proposed methods described above can be implemented independently, but can also be implemented in the form of a combination (or merge) of some of the proposed methods. A rule can be defined so that the base station notifies the terminal of the application of the proposed methods (or information on the rules of the proposed methods) through a predefined signal (e.g., a physical layer signal or a higher layer signal). The upper layer may include one or more of the functional layers, such as MAC, RLC, PDCP, RRC, SDAP, for example.

[0181]

[0182] The methods, embodiments or descriptions for implementing the method proposed in this specification may be applied separately, or one or more methods (or embodiments or descriptions) may be applied in combination.

[0183]

[0184] [Terminal claim related explanation]

[0185] The embodiments described below are specifically described with reference to FIG. 7 in terms of the operation of a user equipment (UE). The methods described below are distinguished for convenience of explanation, and it is understood that some components of one method may be substituted for or combined with some components of another method, as long as they are not mutually exclusive.

[0186] FIG. 7 is a diagram illustrating an example of the operation process of a terminal in a system applicable to the present disclosure.

[0187] In step S710, a user equipment (UE) receives configuration information related to a random access channel (RACH) resource for a random access (RA) procedure and one or more repetition number sets including multiple repetition numbers for PRACH repeated transmissions (physical random access channel repeated transmissions) from a base station (BS).

[0188] At step S720, the terminal determines, based on the configuration information, one repetition number set from among the one or more repetition number sets, one repetition number from among the plurality of repetition numbers included in the repetition number set, and whether the PRACH repeated transmissions are based on different transmission beams or one same transmission beam.

[0189] In step S730, the terminal performs the PRACH repeated transmissions corresponding to the determined number of repetitions based on the different transmission beams or the same transmission beam using the RACH resource.

[0190] The different transmission beams are associated with different SSBs (synchronization signal blocks) or different RSs (reference signals), and the same transmission beam is associated with one SSB or one RS.

[0191]

[0192] According to various embodiments of the present disclosure, when the PRACH repeated transmissions are performed based on the different transmission beams, the PRACH repeated transmissions may be based on the transmission power set to be the same based on the path loss of the best beam with the best received signal received power (RSRP) or the worst beam with the worst RSRP among the different transmission beams.

[0193] According to various embodiments of the present disclosure, the one or more sets of repetition counts may include a first set of repetition counts for cases where the PRACH repeated transmissions are based on the different transmission beams, and a second set of repetition counts for cases where the PRACH repeated transmissions are based on the same transmission beam.

[0194] According to various embodiments of the present disclosure, the first repetition counts included in the first repetition count sets may be greater than or equal to the second repetition counts included in the second repetition count set.

[0195] According to various embodiments of the present disclosure, the embodiment of FIG. 7 may further include receiving, from the base station, a higher layer signaling including indication information of whether the PRACH repeated transmissions are based on different transmission beams or the same transmission beam, and indication information of a specific number of repetitions included in the first repetition number set or the second repetition number set. The PRACH repeated transmissions may be performed based on the higher layer signaling.

[0196] According to various embodiments of the present disclosure, the one or more sets of repetition counts may be one set of repetition counts. When receiving a higher layer signal from the base station that includes indication information on whether the PRACH repeated transmissions are based on the different transmission beams, the PRACH repeated transmissions may be performed based on the different transmission beams. When not receiving the higher layer signal from the base station, the PRACH repeated transmissions may be performed based on the same transmission beam.

[0197] According to various embodiments of the present disclosure, the one or more sets of repetition counts may be one set of repetition counts. When receiving a higher layer signal from the base station that includes indication information on whether the PRACH repeated transmissions are based on the same transmission beam, the PRACH repeated transmissions may be performed based on the same transmission beam. When not receiving the higher layer signal from the base station, the PRACH repeated transmissions may be performed based on the different transmission beams.

[0198]

[0199] According to various embodiments of the present disclosure, a terminal is provided in a wireless communication system. The terminal includes a transceiver and at least one processor, wherein the at least one processor may be configured to perform the terminal operation method according to FIG. 7.

[0200]

[0201] According to various embodiments of the present disclosure, a device for controlling a terminal in a wireless communication system is provided. The device includes at least one processor and at least one memory operably connected to the at least one processor. The at least one memory may be configured to store instructions for performing the operating method of the terminal according to FIG. 7 based on instructions executed by the at least one processor.

[0202]

[0203] According to various embodiments of the present disclosure, one or more non-transitory computer-readable media (CRM) storing one or more commands are provided. The one or more commands, when executed by one or more processors, perform operations, and the operations may include the operating method of the terminal according to FIG. 7.

[0204]

[0205] [Explanation regarding base station claims]

[0206] The embodiments described below are specifically described with reference to FIG. 8 from the perspective of the operation of a base station (BS). The methods described below are distinguished for convenience of explanation, and it is understood that some components of one method may be substituted for or combined with some components of another method, as long as they are not mutually exclusive.

[0207] FIG. 8 is a diagram illustrating an example of an operation process of a base station in a system applicable to the present disclosure.

[0208] In step S810, a base station (BS) transmits configuration information related to a random access channel (RACH) resource for a random access (RA) procedure and one or more repetition number sets including multiple repetition numbers for PRACH repeated transmissions (physical random access channel repeated transmissions) to a user equipment (UE).

[0209] Based on the above configuration information, one repetition number set from among the one or more repetition number sets, one repetition number from among the plurality of repetition numbers included in the repetition number set, and whether the PRACH repeated transmissions are based on different transmission beams or on one same transmission beam are determined.

[0210] In step S820, the base station receives the PRACH repeated transmissions corresponding to the determined number of repetitions based on the different transmission beams or the same transmission beam from the terminal using the RACH resource.

[0211] The different transmission beams are associated with different SSBs (synchronization signal blocks) or different RSs (reference signals), and the same transmission beam is associated with one SSB or one RS.

[0212]

[0213] According to various embodiments of the present disclosure, when the PRACH repeated transmissions are received based on the different transmission beams, the PRACH repeated transmissions may be based on the transmission power set to be the same based on the path loss of the best beam with the best received signal received power (RSRP) or the worst beam with the worst RSRP among the different transmission beams.

[0214] According to various embodiments of the present disclosure, the one or more sets of repetition counts may include a first set of repetition counts for cases where the PRACH repeated transmissions are based on the different transmission beams, and a second set of repetition counts for cases where the PRACH repeated transmissions are based on the same transmission beam.

[0215] According to various embodiments of the present disclosure, the first repetition counts included in the first repetition count sets may be greater than or equal to the second repetition counts included in the second repetition count set.

[0216] According to various embodiments of the present disclosure, the embodiment of FIG. 8 may further include transmitting, to the terminal, a higher layer signaling including indication information of whether the PRACH repeated transmissions are based on different transmission beams or the same transmission beam, and indication information of a specific number of repetitions included in the first repetition number set or the second repetition number set. The PRACH repeated transmissions may be received based on the higher layer signaling.

[0217] According to various embodiments of the present disclosure, the one or more sets of repetition counts may be a single set of repetition counts. When higher layer signaling is transmitted to the terminal including indication information on whether the PRACH repeated transmissions are based on the different transmission beams, the PRACH repeated transmissions may be received based on the different transmission beams. When the higher layer signaling is not transmitted to the terminal, the PRACH repeated transmissions may be received based on the same transmission beam.

[0218] According to various embodiments of the present disclosure, the one or more sets of repetition counts may be a single set of repetition counts. When a higher layer signaling including indication information indicating whether the PRACH repeated transmissions are based on the same transmission beam is transmitted to the terminal, the PRACH repeated transmissions may be received based on the same transmission beam. When the higher layer signaling is not transmitted to the terminal, the PRACH repeated transmissions may be received based on the different transmission beams.

[0219]

[0220] According to various embodiments of the present disclosure, a base station is provided in a wireless communication system. The base station includes a transceiver and at least one processor, wherein the at least one processor may be configured to perform the operating method of the base station according to FIG. 8.

[0221]

[0222] According to various embodiments of the present disclosure, a device for controlling a base station in a wireless communication system is provided. The device includes at least one processor and at least one memory operably connected to the at least one processor. The at least one memory may be configured to store instructions for performing the operating method of the base station according to FIG. 8 based on instructions executed by the at least one processor.

[0223]

[0224] According to various embodiments of the present disclosure, one or more non-transitory computer-readable media (CRM) storing one or more commands are provided. The one or more commands, when executed by one or more processors, perform operations, and the operations may include the operating method of a base station according to FIG. 8.

[0225]

[0226] Wireless devices applicable to the present disclosure

[0227] Below, examples of wireless devices to which various embodiments of the present disclosure are applied are described.

[0228] FIG. 9 is a drawing showing an example of the structure of a first device and a second device in a system applicable to the present disclosure.

[0229] The first device (1600) may include a processor (1610), an antenna unit (1620), a transceiver (1630), and a memory (1640).

[0230] The processor (1610) performs baseband-related signal processing and may include a higher layer processing unit (1611) and a physical layer processing unit (1615). The higher layer processing unit (1611) may process operations of a MAC layer, an RRC layer, or higher layers. The physical layer processing unit (1615) may process operations of a PHY layer. For example, when the first device (1600) is a base station device in base station-to-terminal communication, the physical layer processing unit (1615) may perform uplink reception signal processing, downlink transmission signal processing, etc. For example, when the first device (1600) is a first terminal device in terminal-to-terminal communication, the physical layer processing unit (1615) may perform downlink reception signal processing, uplink transmission signal processing, sidelink transmission signal processing, etc. In addition to performing baseband-related signal processing, the processor (1610) may also control the overall operation of the first device (1600).

[0231] The antenna unit (1620) may include one or more physical antennas, and when it includes multiple antennas, it may support MIMO transmission and reception. The transceiver (1630) may include an RF (Radio Frequency) transmitter and an RF receiver. The memory (1640) may store information processed by the processor (1610), and software, an operating system, applications, etc. related to the operation of the first device (1600), and may also include components such as a buffer.

[0232] The processor (1610) of the first device (1600) may be configured to implement the operation of the base station in the base station-to-terminal communication (or the operation of the first terminal device in the terminal-to-terminal communication) in the embodiments described in the present disclosure.

[0233]

[0234] The second device (1650) may include a processor (1660), an antenna unit (1670), a transceiver (1680), and a memory (1690).

[0235] The processor (1660) performs baseband-related signal processing and may include a higher layer processing unit (1661) and a physical layer processing unit (1665). The higher layer processing unit (1661) may process operations of a MAC layer, an RRC layer, or higher layers. The physical layer processing unit (1665) may process operations of a PHY layer. For example, when the second device (1650) is a terminal device in base station-terminal communication, the physical layer processing unit (1665) may perform downlink reception signal processing, uplink transmission signal processing, etc. For example, when the second device (1650) is a second terminal device in terminal-to-terminal communication, the physical layer processing unit (1665) may perform downlink reception signal processing, uplink transmission signal processing, sidelink reception signal processing, etc. In addition to performing baseband-related signal processing, the processor (1660) may also control the overall operation of the second device (1660).

[0236] The antenna unit (1670) may include one or more physical antennas, and when including multiple antennas, may support MIMO transmission and reception. The transceiver (1680) may include an RF transmitter and an RF receiver. The memory (1690) may store information processed by the processor (1660), and software, an operating system, applications, etc. related to the operation of the second device (1650), and may also include components such as a buffer.

[0237] The processor (1660) of the second device (1650) may be configured to implement operations of the terminal in base station-to-terminal communication (or operations of the second terminal device in terminal-to-terminal communication) in the embodiments described in the present disclosure.

[0238] In the operation of the first device (1600) and the second device (1650), the same explanations given for the base station and the terminal (or the first terminal and the second terminal in the terminal-to-terminal communication) in the examples of the present disclosure may be applied, and redundant explanations are omitted.

[0239]

[0240] Here, the wireless communication technology implemented in the device (1600, 1650) of the present disclosure may include various other wireless communication technologies as well as LTE, NR, and 6G.

[0241]

[0242] The claims described in the various embodiments of the present disclosure may be combined in various ways. For example, the technical features of the method claims of the various embodiments of the present disclosure may be combined and implemented as a device, and the technical features of the device claims of the various embodiments of the present disclosure may be combined and implemented as a method. Furthermore, the technical features of the method claims of the various embodiments of the present disclosure may be combined and implemented as a device, and the technical features of the method claims of the various embodiments of the present disclosure may be combined and implemented as a method.

Claims

1. In a method performed by a terminal (user equipment, UE), A step of receiving configuration information related to one or more repetition number sets including a RACH resource (random access channel resource) for a random access (RA) procedure and a plurality of repetition numbers for PRACH repeated transmissions (physical random access channel repeated transmissions) from a base station (BS); A step of determining, based on the above configuration information, one repetition number set from among the one or more repetition number sets, one repetition number from among the plurality of repetition numbers included in the repetition number set, and whether the PRACH repeated transmissions are based on different transmission beams or on one same transmission beam; A step of performing the PRACH repeated transmissions corresponding to the determined number of repetitions based on the different transmission beams or the same transmission beam using the RACH resource, The different transmission beams are associated with different SSBs (synchronization signal blocks) or different RSs (reference signals), and the same transmission beam is associated with one SSB or one RS. method.

2. In paragraph 1, If the above PRACH repetition transmissions are performed based on the different transmission beams, The above PRACH repeated transmissions are based on the transmission power set to be the same based on the path loss of the best beam with the best received signal received power (RSRP) or the worst beam with the worst RSRP among the different transmission beams. method.

3. In paragraph 1, The above one or more sets of repetitions are, A first set of repetition counts for the case where the above PRACH repeated transmissions are based on the different transmission beams, A second repetition count set for cases where the above PRACH repeated transmissions are based on the same transmission beam, method.

4. In paragraph 3, The first repetition counts included in the first repetition count sets are greater than or equal to the second repetition counts included in the second repetition count set, method.

5. In paragraph 3, Further comprising the step of receiving a higher layer signaling from the base station, the higher layer signaling including indication information of whether the PRACH repeated transmissions are based on the different transmission beams or the same transmission beam, and indication information of a specific repetition number included in the first repetition number set or the second repetition number set, The above PRACH repetition transmissions are performed based on the upper layer signal. method.

6. In paragraph 1, The above one or more sets of repetitions are one set of repetitions, When receiving a higher layer signaling from the base station that includes indication information as to whether the PRACH repeated transmissions are based on the different transmission beams, the PRACH repeated transmissions are performed based on the different transmission beams, If the upper layer signal is not received from the base station, the PRACH repeated transmissions are performed based on the same transmission beam. method.

7. In paragraph 1, The above one or more sets of repetitions are one set of repetitions, When receiving a higher layer signaling from the base station that includes indication information as to whether the PRACH repetitive transmissions are based on the same transmission beam, the PRACH repetitive transmissions are performed based on the same transmission beam, If the upper layer signal is not received from the base station, the PRACH repeated transmissions are performed based on the different transmission beams. method.

8. In a method performed by a base station (BS), A step of transmitting configuration information related to one or more repetition number sets including RACH resources (random access channel resources) for RA (random access) procedures and multiple repetition numbers for PRACH repeated transmissions (physical random access channel repeated transmissions) to a user equipment (UE), Based on the above configuration information, one repetition number set from among the one or more repetition number sets, one repetition number from among the plurality of repetition numbers included in the repetition number set, and whether the PRACH repeated transmissions are based on different transmission beams or one same transmission beam are determined; A step of receiving the PRACH repeated transmissions corresponding to the determined number of repetitions based on the different transmission beams or the same transmission beam from the terminal using the RACH resource, The different transmission beams are associated with different SSBs (synchronization signal blocks) or different RSs (reference signals), and the same transmission beam is associated with one SSB or one RS. method.

9. In paragraph 8, If the above PRACH repeated transmissions are received based on the different transmission beams, The above PRACH repeated transmissions are based on the transmission power set to be the same based on the path loss of the best beam with the best received signal received power (RSRP) or the worst beam with the worst RSRP among the different transmission beams. method.

10. In paragraph 8, The above one or more sets of repetitions are, A first set of repetition counts for the case where the above PRACH repeated transmissions are based on the different transmission beams, A second repetition count set for cases where the above PRACH repeated transmissions are based on the same transmission beam, method.

11. In paragraph 10, The first repetition counts included in the first repetition count sets are greater than or equal to the second repetition counts included in the second repetition count set, method.

12. In paragraph 10, Further comprising a step of transmitting to the terminal a higher layer signaling including indication information of whether the PRACH repeated transmissions are based on the different transmission beams or the same transmission beam, and indication information of a specific repetition number included in the first repetition number set or the second repetition number set, The above PRACH repeated transmissions are received based on the upper layer signal, method.

13. In paragraph 8, The above one or more sets of repetitions are one set of repetitions, When transmitting to the terminal a higher layer signaling including indication information as to whether the PRACH repetitive transmissions are based on the different transmission beams, the PRACH repetitive transmissions are received based on the different transmission beams, If the upper layer signal is not transmitted to the terminal, the PRACH repeated transmissions are received based on the same transmission beam. method.

14. In paragraph 8, The above one or more sets of repetitions are one set of repetitions, When transmitting to the terminal a higher layer signaling including indication information as to whether the PRACH repetitive transmissions are based on the same transmission beam, the PRACH repetitive transmissions are received based on the same transmission beam, If the upper layer signal is not transmitted to the terminal, the PRACH repeated transmissions are received based on the different transmission beams. method.

15. In the terminal (user equipment, UE), Transmitter and receiver; at least one processor; and At least one memory operably connectable to said at least one processor and storing instructions that, when executed by said at least one processor, perform operations; The above actions are, Comprising all steps of the method according to any one of claims 1 to 7, Terminal.

16. At the base station (BS), Transmitter and receiver; at least one processor; and At least one memory operably connectable to said at least one processor and storing instructions that, when executed by said at least one processor, perform operations; The above actions are, Comprising all steps of the method according to any one of claims 8 to 14, Base station.

17. In a control device that controls a terminal (user equipment, UE), at least one processor; and comprising at least one memory operably connected to at least one of the processors; The at least one memory stores instructions for performing operations based on being executed by the at least one processor, The above actions are, Comprising all steps of the method according to any one of claims 1 to 7, controller.

18. In a control device that controls a base station (BS), at least one processor; and comprising at least one memory operably connected to at least one of the processors; The at least one memory stores instructions for performing operations based on being executed by the at least one processor, The above actions are, Comprising all steps of the method according to any one of claims 8 to 14, controller.

19. In one or more non-transitory computer-readable media storing one or more instructions, The one or more instructions perform operations based on being executed by one or more processors, The above actions are, Comprising all steps of the method according to any one of claims 1 to 7, Computer readable medium.

20. In one or more non-transitory computer-readable media storing one or more instructions, The one or more instructions perform operations based on being executed by one or more processors, The above actions are, Comprising all steps of the method according to any one of claims 8 to 14, Computer readable medium.

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