Apparatus and method for supporting repeated prach transmission for network energy saving in wireless communication system

Abstract

The present disclosure relates to a wireless communication system. Specifically, the present disclosure relates to an apparatus and method for supporting repeated physical random access channel (PRACH) transmission for network energy saving in a wireless communication system, wherein a NES UE determines an NES RO group by determining an RO group by using a legacy RO and then determining an RO group again by using separate NES ROs, and changes only a target from the legacy RO to NES ROs.

Description

Device and method for supporting PRACH repeated transmission for saving network energy 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 supporting repeated transmission of a physical random access channel (PRACH) to save network energy in a wireless communication system.

[0002]

[0003] Wireless communication systems are widely deployed to provide various types of communication services, such as voice and data. Typically, wireless communication systems are multiple access systems that support communication with multiple users by sharing available system resources (e.g., bandwidth, transmission power). Examples of multiple access systems include Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), and Single Carrier Frequency Division Multiple Access (SC-FDMA).

[0004]

[0005] To solve the above-described problems, the present disclosure provides a device and method for supporting PRACH (physical random access channel) repetitive transmission for network energy saving in a wireless communication system.

[0006] 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.

[0007]

[0008] According to various embodiments of the present disclosure, a method performed by a user equipment (UE) is provided, the method comprising: receiving a physical random access channel configuration (PRACH configuration) including a first random access occasion (RO) set and a second RO set from a base station (BS); determining a first RO group of a plurality of first ROs from among a plurality of first ROs included in the first RO set based on a set rule; determining a second RO group of a plurality of second ROs from among a plurality of second ROs included in the second RO set based on the set rule, wherein the set rule is applied by replacing a target RO with the second RO set instead of the first RO set, and the second RO group is determined based on a second time interval independent of a first time interval for the first RO group; and repeatedly transmitting a random access preamble to the base station based on the second RO group.

[0009] According to various embodiments of the present disclosure, a method performed by a base station (BS) is provided, the method comprising: transmitting a physical random access channel configuration (PRACH configuration) including a first random access occasion (RO) set and a second RO set to a user equipment (UE); and repeatedly receiving a random access preamble from the UE based on a second RO group, wherein the first RO group includes a plurality of first ROs among a plurality of first ROs included in the first RO set based on a set rule, the second RO group includes a plurality of second ROs among a plurality of second ROs included in the second RO set based on the set rule, and the set rule is applied by replacing a target RO with the second RO set instead of the first RO set, and the second RO group is based on a second time interval that is independent of a first time interval for the first RO group.

[0010] According to various embodiments of the present disclosure, a terminal 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 performed by the terminal according to various embodiments of the present disclosure.

[0011] According to various embodiments of the present disclosure, a base station 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 performed by the base station according to various embodiments of the present disclosure.

[0012] According to various embodiments of the present disclosure, a control device for controlling a terminal in a wireless communication system is provided, the control device including 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, the operations including all steps of a method performed by the terminal according to various embodiments of the present disclosure.

[0013] According to various embodiments of the present disclosure, a control device for controlling a base station in a wireless communication system is provided, the control device including 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 what is executed by the at least one processor, the operations including all steps of a method performed by the base station according to various embodiments of the present disclosure.

[0014] 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, based on being executed by one or more processors, perform operations, the operations including all steps of a method performed by a terminal according to various embodiments of the present disclosure.

[0015] According to various embodiments of the present disclosure, one or more non-transitory computer-readable media storing one or more commands, wherein the one or more commands, based on being executed by one or more processors, perform operations, the operations comprising all steps of a method performed by a base station according to various embodiments of the present disclosure, are provided.

[0016]

[0017] To solve the above-described problem, the present disclosure can provide a device and method for supporting PRACH (physical random access channel) repetitive transmission for saving network energy in a wireless communication system.

[0018]

[0019] 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.

[0020] 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.

[0021] FIG. 2 is a diagram illustrating an example of a wireless frame structure used in a system applicable to the present disclosure.

[0022] FIG. 3 is a drawing illustrating an example of a slot structure used in a system applicable to the present disclosure.

[0023] 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.

[0024] FIG. 5 is a diagram illustrating an example of the operation process of a terminal in a system applicable to the present disclosure.

[0025] FIG. 6 is a diagram illustrating an example of an operation process of a base station in a system applicable to the present disclosure.

[0026] FIG. 7 is a diagram illustrating an example of the structure of a first device and a second device in a system applicable to the present disclosure.

[0027]

[0028] 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.”

[0029] 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."

[0030] 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.”

[0031] 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.”

[0032] 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."

[0033] Technical features individually described in a single drawing in various embodiments of the present disclosure may be implemented individually or simultaneously.

[0034]

[0035] Common signal transmission methods in 3GPP

[0036] Physical channels and general signal transmission

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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).

[0041] 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).

[0042] 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.

[0043]

[0044] OFDM (Orthogonal Frequency Division Multiplexing) Numerology

[0045] 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.

[0046]

[0047] Radio frame structure

[0048] FIG. 2 is a diagram illustrating an example of the structure of a wireless frame used in a system applicable to the present disclosure.

[0049] 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).

[0050] 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.

[0051] 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

[0052] N slot symb is the number of symbols in the slot. N frame,uslot is the number of slots in the frame. N subframe,u slot is the number of slots within a subframe.

[0053]

[0054] 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.

[0055] SCS (15*2^u)N slot symb N frame,u slot N subframe,u slot 60KHz (u=2)12404

[0056] 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.

[0057] 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).

[0058] Frequency Range designationCorresponding frequency rangeSubcarrier SpacingFR1450MHz - 6000MHz15, 30, 60kHzFR224250MHz - 52600MHz60, 120, 240kHz

[0059] 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).

[0060] Frequency Range designationCorresponding frequency rangeSubcarrier SpacingFR1410MHz - 7125MHz15, 30, 60kHzFR224250MHz - 52600MHz60, 120, 240kHz

[0061] 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.

[0062]

[0063] FIG. 3 is a drawing illustrating an example of a slot structure used in a system applicable to the present disclosure.

[0064] 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.

[0065]

[0066] 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.

[0067] Fig. 4 is an exemplary system, illustrating the slot structure of a frame of an NR system.

[0068] 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.)

[0069]

[0070] Network Energy Saving Technology (Rel-18)

[0071] Energy conservation at base stations is a key consideration in wireless communication systems, including 3GPP, as it can contribute to building eco-friendly networks by reducing carbon emissions and reducing operational expenditures (OPEX) for telecommunications companies. In particular, the introduction of 5G communications will require higher transmission rates, necessitating base stations to be equipped with more antennas and provide services across wider bandwidths and frequency bands. Consequently, recent studies have shown that base station energy costs have reached as high as 20% of total OPEX. Accordingly, 5G systems are adopting various technologies to reduce energy consumption, known as network energy savings (NES), and the standardization of related technologies is expected to continue. Specifically, the following techniques were discussed in the recent Rel-18.

[0072] (1) Specify SSB-less SCell operation for inter-band CA for FR1 and co-located cells, if found feasible by RAN4 study, where a UE measures SSB transmitted on PCell or another SCell for an SCell's time / frequency synchronization (including downlink AGC) and L1 / L3 measurements, including potential enhancement on SCell activation procedures if necessary [RAN4, RAN2].

[0073] (2) Specify enhancements on cell DTX / DRX mechanism including alignment of cell DTX / DRX and UE DRX in RRC_CONNECTED mode, and inter-node information exchange on cell DTX / DRX [RAN2, RAN1, RAN3]

[0074] (2-1) Note: No change for SSB transmission due to cell DTX / DRX.

[0075] (2-2) Note: The impact on IDLE / INACTIVE UEs due to the above enhancements should be avoided.

[0076] (3) Specify the following techniques in spatial and power domains:

[0077] (3-1) Specify necessary enhancements on CSI and beam management related procedures, including measurement and reporting, and signaling to enable efficient adaptation of spatial elements (e.g., antenna ports, active transceiver chains) [RAN1, RAN2].

[0078] (3-2) Specify necessary enhancements on CSI-related procedures, including measurement and reporting, and signaling, to enable efficient adaptation of power offset values ​​between PDSCH and CSI-RS [RAN1, RAN2].

[0079] (3-3) Note: The above objectives are only for UE-specific channels / signals.

[0080] (3-4) Note: Legacy UE CSI / CSI-RS capabilities apply when considering the total number of CSI reports and requirements.

[0081] (4) If necessary, specify mechanism(s) to prevent legacy UEs from camping on cells adopting the Rel-18 NES techniques. (Specify mechanism(s) to prevent legacy UEs from camping on cells adopting the Rel-18 NES techniques, if necessary [RAN2])

[0082] (5) Specify CHO procedure enhancement(s) in case the source / target cell is in NES mode [RAN2].

[0083] (6) Specify inter-node beam activation and enhancements on restricting paging in a limited area [RAN3].

[0084] (7) If necessary, specify the corresponding RRM / RF core requirements for the above features [RAN4].

[0085]

[0086] Depending on the application of NES technology, the base station can perform operations such as controlling on / off for a certain duration in the time domain, controlling transmission / reception resources for UE-common or UE-specific signals / channels, changing the amount of frequency domain resources, controlling transmission power, or turning on / off antenna ports, transmission-reception points (TRPs), etc. in the spatial domain.

[0087] Examples of the operating procedures of a base station supporting NES technology include: (1) identifying NES solutions (IDENTIFY NES SOLUTION(S)); (2) performing signaling for NES (PERFORM SIGNALING FOR NES); and (3) performing operations for NES (PERFORM OPERATIONS FOR NES).

[0088] The base station identifies the NES solution(s) to be applied. The NES solution(s) may be related to control of signal transmission and reception (e.g., on / off), beam operation, handover procedures, channel measurement and reporting, etc. The NES solution(s) to be applied may be adaptively selected or predefined based on the current situation (e.g., cell load level, characteristics of connected terminals, etc.). The base station that identified the NES solution(s) performs signaling for the NES. The specific signaling procedure may vary depending on the identified NES solution(s). For example, the base station may transmit common information about the NES solution(s), transmit configuration information necessary for NES operation to at least one terminal, or transmit control information regarding the progress of the NES operation to at least one terminal. In addition, the base station may receive capability information related to the NES from at least one terminal. Thereafter, the base station performs operations for the NES. At this time, the base station may perform the operations for the NES based on the previously performed signaling. That is, based on the system information, configuration information, and control information transmitted through signaling, the base station can turn on / off transmission and reception of a specific signal, turn on / off elements in the spatial domain, or adjust resources for transmission and reception of a measurement signal.

[0089] Examples of NES solutions that can be implemented using this procedure include:

[0090] (1) Intra-system energy saving solution: A RAN node may request a neighboring RAN node to switch at least one SSB beam into its inactive cell, or may perform paging using a limited set of beams to an inactive terminal (e.g., a stationary terminal).

[0091] (2) Inter-system energy saving solution: NG-RAN nodes that own capacity booster cells can autonomously transition the cells to an inactive state.

[0092] (3) SSB-less SCell solution: If SSB or SMTC (SSB-based RRM measurement timing configuration) configuration is not provided for the SCell, the UE can obtain timing reference and AGC source from another serving cell. In FR1 or FR2, the base station can configure intra-band CA or inter-band CA including the SCell without SSB transmission, in which case the SSB / SIB transmission can be triggered by the WUS (wake-up signal) of the UE. Accordingly, since the period of common channels / signals such as SSB increases, the base station can stay in the sleep state for a longer time.

[0093] (4) Cell DTX / DRX solution: In order to reduce the downlink transmission / uplink reception activity time of the base station, a periodic cell DTX / DRX pattern (e.g., active and inactive periods) may be commonly set for terminals within a cell having the corresponding feature. Here, the cell DTX pattern and the cell DRX pattern may be set and activated separately, and up to two cell DTX / DRX patterns may be set per MAC entity. When cell DTX is set and activated, at least one of monitoring for SPS opportunities or monitoring PDCCH may be stopped during the cell DTX inactivity period. When cell DRX is set and activated, at least one of transmission on CG resources or SR transmission may be stopped during the cell DRX inactivity period. Cell DTX / DRX may be activated / deactivated via RRC signaling or L1 group common signaling.

[0094] Parameters such as active duration and cycle may be configured for cell DTX / DRX. The active duration is the period during which the UE receives a PDCCH or SPS opportunity and waits to transmit SR or CG, and the cycle specifies the periodic repetition of the active duration and inactive duration. When both cell DTX and cell DRX are configured, parameters such as active duration and cycle are common. If the base station recognizes an emergency call or a public safety-related service (e.g., MPS or MCS), the network may release or deactivate the cell DTX / DRX configuration so as not to affect the service. In addition, at least some overlap is required between the active duration of the connected mode DRX of the UE and the active duration of the cell DTX / DRX. For example, the connected mode DRX cycle of the UE may be a multiple of the cell DTX / DRX cycle, or vice versa.

[0095] (5) Conditional handover (CHO) solution: A CHO procedure performed in a manner in which the execution of a handover is determined by the UE is used while the NES technology is applied (e.g., when the cell activates or deactivates cell DTX / DRX). In this case, the UE can use an NES-specific CHO event to initiate CHO for a candidate cell, and reception of a DCI activating the CHO condition(s) set as an NES event indication can be applied as an additional triggering condition for this.

[0096] (6) Spatial and power domain adaptation solution: To support the gNB for transceiver muting and / or transmit power adaptation, the UE may be configured to report multiple CSI entries in a CSI report based on multiple sub-configurations. Each sub-configuration corresponds to a spatial domain adaptation pattern (e.g., a subset of available spatial elements) and / or a power offset between a data channel (e.g., PDSCH) and CSI-RS. Depending on the application of the spatial and power domain adaptation solution, the CSI configuration, measurement, and / or reporting behavior may be affected.

[0097]

[0098] Network Energy Saving Technology (Rel-19)

[0099] A work item titled "Enhancements of network energy savings for NR" was additionally approved in 3GPP NR release 19. Specifically, the following enhancement techniques are being considered in 3GPP NR release 19:

[0100] Objective of SI (Study Item) or Core Part WI (Work Item) or Testing Part WI.

[0101] The objectives of the work item are as follows:

[0102]

[0103] (1) For both intra-band and inter-band CA (Cell-to-Cell), specify the procedures and signaling methods to support on-demand SSB SCell (secondary cell) operation for a terminal (UE) in connected mode configured as CA. [RAN1 / 2 / 3 / 4]

[0104] (Specify procedures and signaling method(s) to support on-demand SSB SCell operation for UEs in connected mode configured with CA, for both intra- / inter-band CA. [RAN1 / 2 / 3 / 4])

[0105] (1-1) Specify triggering method(s) (select from UE uplink wake-up signal using an existing signal / channel, cell on / off indication via backhaul, SCell activation / deactivation signaling)

[0106] (1-2) Note 1: On-demand SSB transmission can be used by UEs for at least SCell time / frequency synchronization, L1 / L3 measurements, and SCell activation, and is supported for FR1 and FR2 in non-shared spectrum.

[0107] (2) Study procedures and signaling method(s) to support on-demand SIB1 for UEs in idle / inactive mode, including: [RAN1 / 2 / 3]

[0108] (2-1) Triggering method by uplink WUS using an existing signal / channel.

[0109] (2-2) Provisioning WUS configuration to the terminal (Wake-up signal configuration provisioning to the UE)

[0110] (2-2-1) Note: No modification of SSB will be discussed under this objective.

[0111] (2-3) Information exchange between gNBs (base stations) at least for the configuration of the wake-up signal, if necessary.

[0112] (2-4) Checkpoint for normative work in RAN#105.

[0113] (3) Specify adaptation of common signal / channel transmissions. [RAN1 / 2 / 3 / 4]

[0114] (3-1) Adaptation of SSB in the time domain, e.g., adapting periodicity.

[0115] (3-2) PRACH adaptation in the time domain

[0116] (3-3) Study adaptation of PRACH in the spatial domain, e.g., non-uniform PRACH resources per SSB, and specify if found beneficial.

[0117] (3-3-1) This study will be conducted only in the second quarter of 2024.

[0118] (3-4) Adaptation of paging occasions, including confining paging occasions in the time domain.

[0119] (3-4-1) Note: There should be no paging latency increase.

[0120] (3-5) Note: There should be no negative impact on legacy UEs unless significant benefits are demonstrated.

[0121] (4) Specify the corresponding core requirements for the above features [RAN4].

[0122]

[0123] Description of prior art

[0124] A PRACH adaptation scheme is being considered for network energy conservation. This method involves a base station, when determining that there are few UEs in a specific cell, sparsely configuring the RO and then acquiring NES gain. When a large number of UEs enter the cell, the base station temporarily activates the RO for the UEs. The additionally activated RO can be referred to as a NES RO. The NES RO referred to in this specification can be configured with a time / frequency offset based on the legacy RACH configuration, or it can be a set of RACH occasions configured through an additional RACH configuration separate from the legacy RACH configuration.

[0125] Meanwhile, depending on how the NES RO is allocated in 3GPP Release 19 NES, it can be categorized into the following two cases.

[0126] (1) Case 1: NES RO settings based on Legacy RO settings

[0127] (1-1) A method of providing a time / frequency offset for NES RO based on the setting value of the legacy RACH configuration, or providing one more PRACH configuration index dedicated to NES RO within the corresponding PRACH configuration.

[0128] (2) Case 2: NES RO setup using additional RACH configuration

[0129] (2-1) Allocate NES RO using Additional RACH configuration

[0130] At this time, if the configuration is as in Case 1 above, and a feature combination is set in the legacy RACH configuration so that some preambles are allocated to the RACH partition for 'msg1 repetition', it is necessary to define how to interpret the RACH partition for 'msg1 repetition' in the NES RO created based on this. Therefore, the present invention proposes methods for setting / applying msg1 repetition to the NES RO when the NES RO is defined as in Case 1 and / or Case 2 above.

[0131]

[0132] The RACH occasion mentioned in this specification mainly targets the 4-step RACH procedure, but if a similar operation is applied to the 2-step RACH procedure, the methods in which the RACH occasion (or RO, or RACH resource, etc.) is considered in this specification may be similarly applied to the RACH occasion and / or PUSCH occasion in the 2-step RACH procedure.

[0133] Cell A, as referred to in this specification, refers to a cell where legacy UEs and NES UEs coexist, and the base station can provide information (e.g., WUS configuration, etc.) necessary for NES cell operation through higher layer signaling (e.g., SIB1, etc.) of Cell A. In this case, NES cell refers to a cell where only NES UEs are allowed.

[0134] The SSB-to-RO mapping cycle referred to in this specification means the "mapping cycle" used in the 38.213 spec, and specifically means a time interval in which mapping is completed once to the same ratio of RACH resources according to the SSB-to-RO mapping ratio (e.g., "ssb-perRACH-Occasion") for each SSB beam index configured / instructed to be used in the corresponding cell. For example, if four SSB beam indices are instructed to be used and the SSB-to-RO mapping ratio is 1:1, one SSB beam index can be mapped to each of the four ROs, and the four ROs become one SSB-to-RO mapping cycle.

[0135] Additionally, considering the situation where ROs may be mapped unevenly per SSB beam index, a mapping cycle may mean a time interval in which mapping is completed once to RACH resources with different ratios according to the SSB-to-RO mapping ratio (e.g., "ssb-perRACH-Occasion") for each SSB beam index configured / instructed to be used in the cell. For example, if 4 SSB beam indices are instructed to be used, and SSB beam index #0 and #1 have an SSB-to-RO mapping ratio of 1:1, and SSB beam index #2 and #3 have an SSB-to-RO mapping ratio of 1:2, SSB beam index #0 and #1 are mapped to each of the 2 ROs, and then SSB beam index #2 and #3 are mapped to each of the 2 ROs out of the 4 ROs, so that a total of 6 ROs can be one SSB-to-RO mapping cycle.

[0136] The RO group mentioned in this specification can be replaced with a 'set of valid ROs', which is a set of ROs grouped for msg1 repetition.

[0137]

[0138] Composition and Method of the Invention

[0139] In this disclosure, '()' can be interpreted as both excluding the content within () and including the content within the parentheses.

[0140] In this disclosure, ' / ' may mean including all of the contents separated by / (and) or including only some of the contents separated by / (or).

[0141] First, if the NES RO configuration is performed as described in Case 1 (i.e., NES RO configuration based on legacy RO configuration values), and a feature combination is set in the legacy RACH configuration so that some preambles are allocated to the RACH partition for 'msg1 repetition', it is necessary to define how the RACH partition for 'msg1 repetition' is interpreted in the NES RO created based on this.

[0142]

[0143] 3.1. How to disable NES RO for msg1 repetition

[0144] First, we can consider configuring the NES RO not to be used for msg1 repetition. For example, even if a RACH partition for msg1 repetition is configured in the legacy RO, we can define that the NES RO based on the configuration of the legacy RO does not have a RACH partition for msg1 repetition. In this case, the NES UE can define that the preamble indices with the same value as the preamble indices assigned for 'msg1 repetition' in the legacy RO are used for the purpose of single PRACH transmission in the NES RO. In this case, the legacy UE and / or NES UE that want to perform msg1 repetition can perform msg1 repetition using an RO group consisting only of legacy ROs. In other words, among the NES UEs, a UE that wants to perform msg1 repetition can be defined to perform msg1 repetition using only the legacy ROs without using the NES RO.

[0145] As another example, since a RACH partition for msg1 repetition is set in a legacy RO, it can be defined that a RACH partition for msg1 repetition is also set in a NES RO using the same preamble indexes. However, even in this case, legacy UEs and / or NES UEs that want to perform msg1 repetition can be defined to perform msg1 repetition using an RO group consisting only of legacy ROs. In other words, among NES UEs, a UE that wants to perform msg1 repetition can be defined to perform msg1 repetition using only legacy ROs without using NES ROs.

[0146] The reason for this setting is to avoid adding a separate RO group determination method to NES UEs without changing the RO group determination method understood by legacy UEs, thereby avoiding increasing the complexity of the terminal / base station. However, there is a problem that the preamble indexes allocated for msg1 repetition in NES RO may not be used for any purpose and may be discarded.

[0147]

[0148] 3.2. How to use msg1 repetition in NES RO along with Legacy RO

[0149] Since the method proposed in 3.1 above may result in some preambles in the NES RO being unused and discarded, we can consider defining msg1 repetition in the NES RO as well. That is, since a RACH partition for msg1 repetition is set in the legacy RO, the RACH partition for msg1 repetition can also be defined to be set in the NES RO using the same preamble indices. In this case, a legacy UE that wants to perform msg1 repetition can perform msg1 repetition using an RO group consisting only of legacy ROs. However, the NES UE needs to decide how to define the RO group.

[0150] As a first method, NES UEs can be configured to perform msg1 repetition using an RO group (e.g., an NES RO group) consisting solely of NES ROs. To achieve this, the NES UE must first perform RO group determination using legacy ROs, and then perform RO group determination again using NES ROs to determine the NES RO group. Essentially, the legacy RO group determination rule can be reused, but the target can be changed from legacy ROs to NES ROs. At this time, a time period independent of the specific time period used for legacy RO group determination (e.g., a time period consisting of one or more association pattern periods) can be determined for NES RO group determination. Furthermore, in NES ROs, RO group determination can be defined to be performed among ROs with the same SSB beam / index, and the starting RO and the remaining ROs constituting a specific NES RO group can always use the same frequency index. Meanwhile, valid NES ROs can be used when configuring a NES RO group. For example, NES ROs that fully / partially overlap with legacy ROs can be defined as invalid NES ROs and excluded from NES RO group determination.

[0151] As a second method, NES UEs can be configured to perform msg1 repetition using an RO group (e.g., a super RO group) that includes both legacy ROs and NES ROs. To achieve this, the NES UE must first perform RO group determination using legacy ROs, and then perform RO group determination again using both legacy ROs and NES ROs to determine the super RO group. Essentially, the legacy RO group determination rule can be reused, but the target can be changed from legacy ROs to ROs that include both legacy ROs and NES ROs. At this time, a time period independent of the specific time period used for legacy RO group determination (e.g., a time period consisting of one or more association pattern periods) can be determined for super RO group determination. Furthermore, RO group determination can be defined to be performed between ROs that have the same SSB beam / index in both legacy ROs and NES ROs, and the starting RO and the remaining ROs that comprise a specific super RO group always use the same frequency index. Alternatively, valid NES ROs can be used to configure the super RO group. For example, NES ROs that fully / partially overlap with legacy ROs can be defined as invalid NES ROs and excluded from super RO group determination.

[0152]

[0153] As a method that can be commonly applied to the above proposed methods, when the base station activates the NES RO, the NES UE can be defined to perform msg1 repetition using the NES RO group (or super RO group), or the base station can consider a method in which the NES UE configures / instructs which RO group, between the legacy RO group and the NES RO group (or super RO group), to perform msg1 repetition through higher layer signaling (or dynamic indication). Alternatively, the base station can consider a method in which the NES UE configures / instructs whether to use the NES RO group or the super RO group through higher layer signaling (or dynamic indication). On the other hand, when the base station deactivates the NES RO (or all NES ROs are invalid), the NES UE can be defined to perform msg1 repetition using the legacy RO group.

[0154]

[0155] Alternatively, when configuring RACH partitioning for legacy ROs, one could consider configuring two or more msg1-repetition features with the same repetition number for different preamble index regions. If two are configured, one could be a RACH partitioning scheme for performing msg1 repetitions by defining an RO group consisting only of legacy ROs (or NES ROs), while the other could be a RACH partitioning scheme for performing msg1 repetitions by defining a super RO group that includes both legacy ROs and NES ROs. In this case, the base station can separately configure / indicate the range of ROs that can form an RO group in a specific RACH partition, such as {legacy RO}, {NES RO}, {legacy RO, NES RO}, etc., via higher layer signaling. Furthermore, the legacy UE can define a RACH partition configured for a super RO group to be an invalid RACH partition, thereby not selecting the corresponding RACH partition.

[0156] For example, preamble index #0~#4 of legacy RO can be a RACH partition that forms an RO group with legacy ROs and performs msg1 repetition, and preamble index #5~#9 can be a RACH partition that forms a super RO group including legacy ROs and NES ROs and performs msg1 repetition. At this time, preamble index #5~#9 can be defined so that legacy UEs cannot use them, and NES UEs can use them for msg1 repetition only when the NES RO is activated by the base station or when the NES RO is valid. Similarly, preamble index #0~#4 of NES RO can be a RACH partition that forms an NES RO group with NES ROs and performs msg1 repetition, and preamble index #5~#9 can be a RACH partition that forms a super RO group including legacy ROs and NES ROs and performs msg1 repetition. In this case too, it can be defined that the NES UE will be used for msg1 repetition purposes only when the NES RO is activated from the base station or when the NES RO is valid.

[0157]

[0158] 3.3. How to independently set the msg1 repetition number of NES RO

[0159] Next, we can consider setting the msg1 repetition number differently between the NES RO and the legacy RO. For example, the legacy RO could have the msg1 repetition number set to one of {2, 4, 8}, while the NES RO could have the msg1 repetition number set to one of {3, 6}, or we can consider not setting the msg1 repetition and only applying single transmission. As another example, the legacy RO could have the msg1 repetition number set to one of {2, 4, 8}, while the NES RO could have the msg1 repetition number set to one of {2, 4, 8}, or one of {16, 32, 64}.

[0160] If the NES RO is defined as in Case 1 above, for the proposed method, one more parameter that sets / indicates msg1 repetition may be introduced for the NES RO, and the base station may consider setting / indicating it through higher layer signaling.

[0161]

[0162] In other words, while it may be desirable to use the same repetition number set between legacy RO and NES RO, a method of separately setting / indicating the repetition number set for NES RO can also be considered. Meanwhile, even if the same repetition number set is shared between legacy RO and NES RO, a method of introducing an additional parameter for setting / indicating the msg1 repetition can also be considered. That is, one of the same repetition number sets can be considered for indicating the legacy RO using the existing parameter for setting / indicating the msg1 repetition, and for the NES RO, an additional parameter for setting / indicating the msg1 repetition can be introduced so that they are independently indicated. Furthermore, a method of defining different repetition number sets between legacy RO and NES RO and introducing an additional parameter for setting / indicating the msg1 repetition can also be considered. That is, one could consider using the existing parameter that sets / indicates msg1 repetition for legacy RO to indicate one of the different repetition number sets, and introducing one more additional parameter that sets / indicates msg1 repetition for NES RO to indicate them independently.

[0163]

[0164] 3.4. How to prevent NES operation and msg1 repetition operation from being indicated simultaneously

[0165] Meanwhile, if the base station intentionally sets the legacy RO to be sparse to obtain NES gain, and at the same time sets the msg1 repetition feature considering the UE's coverage enhancement, it may not be easy to obtain NES gain because the base station must accumulate and decode the msg1 preambles transmitted to each RO while the UE performs msg1 repetition (i.e., during the section in which the RO group is configured).

[0166] Therefore, it can be defined that the NES operation and the msg1 repetition feature cannot be configured at the same time. For example, if the base station intentionally configures the legacy RO to be sparse in order to obtain NES gain and then tries to perform the NES RO adaptation operation, it can be defined that the msg1 repetition feature is not configured for both the legacy RO and / or the NES RO. In another example, the base station can define that a UE that wants to use the NES RO allocated through NES RO adaptation does not perform the msg1 repetition regardless of the configuration value. In other words, a UE that wants to use the NES RO allocated through NES RO adaptation can be defined not to select the RACH partition allocated with the msg1 repetition feature.

[0167]

[0168] Additionally, the proposed methods can be applied in a SBFD (subband-wise full duplex) environment. For example, legacy ROs and additional ROs can be configured / indicated through the legacy PRACH configuration. In this case, the legacy ROs and additional ROs can be distinguished depending on the location of the ROs configured / indicated through the legacy PRACH configuration. That is, if the RO configured / indicated through the legacy PRACH configuration is located in a non-SBFD symbol and / or an SBFD symbol configured / indicated as flexible, it can be defined as a legacy RO, and if it is located in an SBFD symbol configured / indicated as downlink, it can be defined as an additional RO. As another example, a method may be considered in which some parameters of the legacy PRACH configuration are configured / indicated through a specific rule, or in which the base station configures / indicates additional parameters to include the ROs generated by the legacy PRACH configuration in the SBFD region (e.g., SBFD symbols configured / indicated as downlink). That is, a method of shifting the slot index and / or OFDM symbol index may be considered. As another example, a method of setting / indicating an additional PRACH configuration independent of the legacy PRACH configuration to set / indicate an RO dedicated to SBFD may also be considered.

[0169] At this time, the msg1 repetition method for legacy RO and the msg1 repetition method for additional RO can be applied similarly to the above-mentioned proposed methods. That is, in the above-mentioned proposed methods, the NES RO can be applied by changing it to an additional RO of SBFD, and the NES UE can be applied by changing it to an SBFD UE and applying it similarly.

[0170]

[0171] Although the NES UE and / or NES RO and / or NES cell used in the specification are primarily targeted at systems that support network energy saving features, similar methods can also be applied to systems that support other technologies (e.g., coverage enhancement, wave-up signal, ambient IoT, duplex enhancement, etc.).

[0172]

[0173] In this specification, ' / ' means 'and', 'or', or 'and / or' depending on the context. In addition, it is clear that examples of the proposed method described above can also be considered as a type of proposed method since they can be included as one of the implementation methods of this specification. 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 higher layer can include one or more of functional layers such as MAC, RLC, PDCP, RRC, and SDAP, for example.

[0174]

[0175] 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.

[0176]

[0177] [Description of the first device (terminal) claim]

[0178] The embodiments described below are specifically described with reference to FIG. 5 in terms of the operation of a first device (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.

[0179] FIG. 5 is a diagram illustrating an example of the operation process of a terminal in a system applicable to the present disclosure.

[0180] In step S510, the terminal receives a PRACH configuration (physical random access channel configuration) including a first random access occasion (RO) set and a second RO set from a base station (BS).

[0181] At step S520, the terminal determines a first RO group of a plurality of first ROs among a plurality of first ROs included in the first RO set based on the set rule.

[0182] At step S530, the terminal determines a second RO group of a plurality of second ROs among a plurality of second ROs included in the second RO set based on the above-described set of rules.

[0183] The above set rule is applied by replacing the target RO with the second RO set instead of the first RO set.

[0184] The second RO group is determined based on a second time interval independent of the first time interval for the first RO group.

[0185] In step S540, the terminal repeatedly transmits a random access preamble to the base station based on the second RO group.

[0186]

[0187] According to various embodiments of the present disclosure, the PRACH configuration may include information indicating the location of ROs on a time-frequency resource grid. The plurality of second ROs may be ROs located in time resources configured for downlink in a subband full duplex (SBFD) environment.

[0188] According to various embodiments of the present disclosure, each of the first time interval and the second time interval may be defined by one or more association pattern periods.

[0189] According to various embodiments of the present disclosure, the second RO group may be composed of second ROs that do not overlap each other. Among the plurality of second ROs, a second RO that completely or partially overlaps with the plurality of first ROs may be excluded from the second RO group.

[0190] According to various embodiments of the present disclosure, the plurality of second ROs included in the second RO group may be based on a common SSB (synchronization signal block) index.

[0191] According to various embodiments of the present disclosure, the established rule may be defined based on the relative order or positional relationship between ROs. The established rule may be applied equally to the plurality of first ROs. The established rule may be applied equally to the plurality of second ROs.

[0192] According to various embodiments of the present disclosure, the second RO group may include only second ROs that are valid for the terminal. The valid second ROs may be ROs located on frequency resources accessible to the terminal.

[0193]

[0194] 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 operating method of the terminal according to FIG. 5.

[0195]

[0196] 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. 5 based on instructions executed by the at least one processor.

[0197]

[0198] 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. 5.

[0199]

[0200] [Description regarding the second device (base station) claim]

[0201] The embodiments described below are specifically described with reference to FIG. 6 in terms of the operation of a second device (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 some components of another method, or may be applied in combination with each other, as long as they are not mutually exclusive.

[0202] FIG. 6 is a diagram illustrating an example of an operation process of a base station in a system applicable to the present disclosure.

[0203] In step S610, the base station transmits a PRACH configuration (physical random access channel configuration) including a first random access occasion (RO) set and a second RO set to the user equipment (UE).

[0204] At step S620, the base station repeatedly receives a random access preamble from the terminal based on the second RO group.

[0205] The first RO group includes a plurality of first ROs among the plurality of first ROs included in the first RO set based on established rules.

[0206] The second RO group includes a plurality of second ROs among a plurality of second ROs included in the second RO set based on the set rule.

[0207] The above set rule is applied by replacing the target RO with the second RO set instead of the first RO set.

[0208] The second RO group is based on a second time interval independent of the first time interval for the first RO group.

[0209]

[0210] According to various embodiments of the present disclosure, the PRACH configuration may include information indicating the location of ROs on a time-frequency resource grid. The plurality of second ROs may be ROs located in time resources configured for downlink in a subband full duplex (SBFD) environment.

[0211] According to various embodiments of the present disclosure, each of the first time interval and the second time interval may be defined by one or more association pattern periods.

[0212] According to various embodiments of the present disclosure, the second RO group may be composed of second ROs that do not overlap each other. Among the plurality of second ROs, a second RO that completely or partially overlaps with the plurality of first ROs may be excluded from the second RO group.

[0213] According to various embodiments of the present disclosure, the plurality of second ROs included in the second RO group may be based on a common SSB (synchronization signal block) index.

[0214] According to various embodiments of the present disclosure, the established rule may be defined based on the relative order or positional relationship between ROs. The established rule may be applied equally to the plurality of first ROs. The established rule may be applied equally to the plurality of second ROs.

[0215] According to various embodiments of the present disclosure, the second RO group may include only second ROs that are valid for the terminal. The valid second ROs may be ROs located on frequency resources accessible to the terminal.

[0216]

[0217] 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. 6.

[0218]

[0219] 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. 6 based on instructions executed by the at least one processor.

[0220]

[0221] 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 base station according to FIG. 6.

[0222]

[0223] Wireless devices applicable to the present disclosure

[0224] Below, examples of wireless devices to which various embodiments of the present disclosure are applied are described.

[0225] FIG. 7 is a diagram illustrating an example of the structure of a first device and a second device in a system applicable to the present disclosure.

[0226] The first device (1600) may include a processor (1610), an antenna unit (1620), a transceiver (1630), and a memory (1640).

[0227] 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).

[0228] 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.

[0229] 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.

[0230]

[0231] The second device (1650) may include a processor (1660), an antenna unit (1670), a transceiver (1680), and a memory (1690).

[0232] 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).

[0233] 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.

[0234] 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.

[0235] 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 any duplicate explanations are omitted.

[0236]

[0237] 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.

[0238]

[0239] 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

In a method performed by a terminal (user equipment, UE), A step of receiving a physical random access channel configuration (PRACH configuration) including a first random access occasion (RO) set and a second RO set from a base station (BS); A step of determining a first RO group of a plurality of first ROs among a plurality of first ROs included in the first RO set based on established rules; A step of determining a second RO group of a plurality of second ROs among a plurality of second ROs included in the second RO set based on the above-described set of rules; The above set rule is applied by replacing the target RO with the second RO set instead of the first RO set, The second RO group is determined based on a second time interval independent of the first time interval for the first RO group; and A step of repeatedly transmitting a random access preamble to the base station based on the second RO group, method. In the first paragraph, The above PRACH configuration includes information indicating the location of the RO on the time-frequency resource grid, The above plurality of second ROs are ROs located in time resources set as downlink in a subband full duplex (SBFD) environment. method. In the first paragraph, The first time interval and the second time interval are each defined by one or more association pattern periods. method. In the first paragraph, The above second RO group is composed of second ROs that do not overlap each other, Among the plurality of second ROs, a second RO that completely or partially overlaps with the plurality of first ROs is excluded from the second RO group. method. In the first paragraph, The plurality of second ROs included in the second RO group are based on a common SSB (synchronization signal block) index. method. In the first paragraph, The above-described rules are defined based on the relative order or positional relationship between ROs, The above-mentioned rules are applied equally to the plurality of first ROs, The above-mentioned rules are applied equally to the plurality of second ROs. method. In the first paragraph, The above second RO group includes only second ROs that are valid for the terminal, The above valid second ROs are ROs located on frequency resources accessible to the terminal. method. In a method performed by a base station (BS), A step of transmitting a PRACH configuration (physical random access channel configuration) including a first random access occasion (RO) set and a second RO set to a user equipment (UE); A step of repeatedly receiving a random access preamble from the terminal based on the second RO group, The first RO group includes a plurality of first ROs among a plurality of first ROs included in the first RO set based on established rules, The second RO group includes a plurality of second ROs among a plurality of second ROs included in the second RO set based on the set rule, The above set rule is applied by replacing the target RO with the second RO set instead of the first RO set, The second RO group is based on a second time interval independent of the first time interval for the first RO group. method. In paragraph 8, The above PRACH configuration includes information indicating the location of the RO on the time-frequency resource grid, The above plurality of second ROs are ROs located in time resources set as downlink in a subband full duplex (SBFD) environment. method. In paragraph 8, The first time interval and the second time interval are each defined by one or more association pattern periods. method. In paragraph 8, The above second RO group is composed of second ROs that do not overlap each other, Among the plurality of second ROs, a second RO that completely or partially overlaps with the plurality of first ROs is excluded from the second RO group. method. In paragraph 8, The plurality of second ROs included in the second RO group are based on a common SSB (synchronization signal block) index. method. In paragraph 8, The above-described rules are defined based on the relative order or positional relationship between ROs, The above-mentioned rules are applied equally to the plurality of first ROs, The above-mentioned rules are applied equally to the plurality of second ROs. method. In paragraph 8, The above second RO group includes only second ROs that are valid for the terminal, The above valid second ROs are ROs located on frequency resources accessible to the terminal. method. 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. 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. 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. 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. 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. 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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