Method and apparatus for transmitting / receiving a signal in a wireless communication system

Abstract

According to an embodiment of the present application, a method and apparatus for transmitting / receiving a signal in a wireless communication system performs a two-step or four-step random access procedure and monitors a PDCCH according to a DRX configuration, wherein a PRACH transmitted in the random access procedure is transmitted on a specific RO from among a plurality of ROs, and a starting RB index of the specific RO can be determined based on (i) a lowest RB index of an RB set including the specific RO, (ii) a starting RB index of an RO positioned at a lowest frequency, and (iii) a lowest RB index of an RB set including the RO positioned at the lowest frequency.

Description

TECHNICAL FIELD

[0001] The disclosure relates to a method and apparatus for a wireless communication system. BACKGROUND

[0002] Generally, wireless communication systems are evolving to diversely cover a wide range to provide communication services such as an audio communication service, a data communication service, etc. A wireless communication is a multiple access system that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmission power, etc.). For example, the multiple access system can include one of a code division multiple access (CDMA) system, a frequency division multiple access (FDMA) system, a time division multiple access (TDMA) system, an orthogonal frequency division multiple access (OFDMA) system, a single carrier frequency division multiple access (SC-FDMA) system, etc. SUMMARY

[0003] TECHNICAL PROBLEM

[0004] The disclosure aims to provide a method and apparatus for efficiently performing a random access procedure in a wireless communication system.

[0005] Those skilled in the art will understand that the purposes that can be achieved by the disclosure are not limited to those specifically described above, and the above and other purposes that can be achieved by the disclosure will be more clearly understood from the following detailed description.

[0006] TECHNICAL SOLUTION

[0007] The disclosure provides a method and apparatus for transmitting and receiving a signal in a wireless communication system.

[0008] In one aspect of the disclosure, a method for transmitting and receiving a signal by a user equipment (UE) operating in a wireless communication system is provided herein, including performing a random access channel (RACH) procedure, monitoring a physical downlink control channel (PDCCH) for an on duration based on a configured DRX operation after performing the RACH procedure, and starting an inactivity timer and remaining awake based on a PDCCH successfully received in the on duration, wherein, during the RACH procedure, a physical random access channel (PRACH) can be transmitted on a specific resource block (RB) index of a plurality of PRACH occasions (ROs), wherein the specific RO can be determined based on (i) a lowest RB index of a RB set including the specific RO, (ii) a starting RB index of an RO located at a lowest frequency, and (iii) a lowest RB index of a RB set including the RO located at the lowest frequency.

[0009] In another aspect of the disclosure, provided herein is a user equipment (UE) for transmitting and receiving signals in a wireless communication system, including at least one transceiver, at least one processor, and at least one memory operatively coupled to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform certain operations, wherein the certain operations can include performing a random access channel (RACH) procedure, monitoring a physical downlink control channel (PDCCH) for an on-duration based on a configured DRX operation after performing the RACH procedure, and starting an inactivity timer and remaining awake based on a successfully received PDCCH for the on-duration, wherein, during the RACH procedure, a physical random access channel (PRACH) can be transmitted on a specific resource block (RB) index of a plurality of PRACH occasions (ROs), wherein the specific RO can be determined based on (i) a lowest RB index of a RB set including the specific RO, (ii) a starting RB index of an RO positioned at a lowest frequency, and (iii) a lowest RB index of a RB set including the RO positioned at the lowest frequency.

[0010] In another aspect of the disclosure, provided herein is a device for a user equipment (UE), including at least one processor, and at least one computer memory operatively coupled to the at least one processor and configured to, when executed, cause the at least one processor to perform operations including performing a random access channel (RACH) procedure, monitoring a physical downlink control channel (PDCCH) for an on-duration based on a configured DRX operation after performing the RACH procedure, and starting an inactivity timer and remaining awake based on a successfully received PDCCH for the on-duration, wherein, during the RACH procedure, a physical random access channel (PRACH) can be transmitted on a specific resource block (RB) index of a plurality of PRACH occasions (ROs), wherein the specific RO can be determined based on (i) a lowest RB index of a RB set including the specific RO, (ii) a starting RB index of an RO positioned at a lowest frequency, and (iii) a lowest RB index of a RB set including the RO positioned at the lowest frequency.

[0011] In another aspect of the disclosure, provided herein is a computer-readable storage medium including at least one computer program that causes at least one processor to perform operations, wherein the operations can include performing a random access channel (RACH) procedure, monitoring a physical downlink control channel (PDCCH) for an on-duration based on a configured DRX operation after performing the RACH procedure, and starting an inactivity timer and remaining awake based on a successfully received PDCCH in the on-duration, wherein, during the RACH procedure, a physical random access channel (PRACH) can be transmitted on a specific RO among a plurality of PRACH occasions (ROs), wherein a starting resource block (RB) index of the specific RO can be determined based on (i) a lowest RB index of a RB set including the specific RO, (ii) a starting RB index of an RO positioned at a lowest frequency, and (iii) a lowest RB index of a RB set including the RO positioned at the lowest frequency.

[0012] In the method and apparatus, a value of the starting RB index of the specific RO can be obtained by adding a value of the lowest RB index of the RB set including the specific RO to an offset value, wherein the offset value can be obtained by subtracting a value of the lowest RB index of the RB set including the RO positioned at the lowest frequency from a value of the starting RB index of the RO positioned at the lowest frequency.

[0013] In the method and apparatus, the plurality of ROs can be respectively included in uplink RB sets each including one RO.

[0014] In the method and apparatus, the uplink RB sets can be included in an uplink active bandwidth part (BWP).

[0015] In the method and apparatus, the plurality of ROs can be configured based on respective uplink RB sets being configured based on nominal guard band information, despite UE-specific guard band information for each of the uplink RB sets.

[0016] The communication device can include at least an autonomous driving vehicle that communicates with the UE, the network, and another autonomous driving vehicle other than the communication device.

[0017] The above-described aspects of the disclosure are only some preferred embodiments of the disclosure, and those skilled in the art can derive and understand various embodiments reflecting the technical features of the disclosure from the following detailed description of the disclosure.

[0018] Advantageous effects

[0019] According to embodiments of the disclosure, the communication device can more efficiently perform a random access procedure in a different manner from the prior art.

[0020] Those skilled in the art will understand that the effects achieved by the present disclosure are not limited to what has been particularly described hereinabove and other advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A radio frame structure is shown.

[0022] Figure 2 A resource grid over a time slot duration is shown.

[0023] Figure 3 A self-contained time slot structure is shown.

[0024] Figure 4 An acknowledgement / negative acknowledgement (ACK / NACK) transmission procedure is shown.

[0025] Figure 5 A wireless communication system supporting unlicensed bands is shown.

[0026] Figure 6 An exemplary method of occupying resources in an unlicensed band is shown.

[0027] Figure 7 And Figure 8 is a flow diagram showing a channel access procedure (CAP) for signal transmission in an unlicensed band.

[0028] Figure 9 A resource block (RB) interlace is shown.

[0029] Figure 10 And Figure 11 is a diagram showing a signal flow of a random access procedure.

[0030] Figures 12 to 18 is a diagram showing an uplink (UL) channel transmission in accordance with an embodiment of the present disclosure.

[0031] Figures 19 to 22 An apparatus in accordance with an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0032] The following techniques can be used in various wireless access systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. The CDMA can be implemented as a radio technology such as universal terrestrial radio access (UTRA) or CDMA2000. The TDMA can be implemented as a radio technology such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE). The OFDMA can be implemented as a radio technology such as institute of electrical and electronics engineers (IEEE) 802.11 (wireless fidelity (Wi-Fi)), IEEE 802.16 (worldwide interoperability for microwave access (WiMAX)), IEEE 802.20, evolved UTRA (E-UTRA), etc. The UTRA is a part of universal mobile telecommunications system (UMTS). 3rd generation partnership project (3GPP) long term evolution (LTE) is a part of evolved UMTS (E-UMTS) using the E-UTRA. LTE-advanced (LTE-A) is an evolved version of 3GPP LTE. 3GPP new radio or new radio access technology (NR) is an evolved version of 3GPP LTE / LTE-A.

[0033] For clarity, the present disclosure will be described in the context of 3GPP communication systems (e.g., LTE and NR), which should not be construed as limiting the spirit of the present disclosure. LTE refers to technologies beyond 3GPP TS 36.xxx Release 8. Specifically, LTE technologies beyond 3GPP TS 36.xxx Release 10 are referred to as LTE-A, and LTE technologies beyond 3GPP TS 36.xxx Release 13 are referred to as LTE-A Pro. 3GPP NR is a technology beyond 3GPP TS 38.xxx Release 15. LTE / NR can be referred to as a 3GPP system. The "xxx" designates a technical specification number. LTE / NR can be collectively referred to as a 3GPP system. Background technologies, terms, abbreviations, etc. as used herein refer to technical specifications published prior to the present disclosure. For example, the following documents can be referred to.

[0034] 3GPP NR

[0035] - 38.211: Physical channels and modulation

[0036] - 38.212: Multiplexing and channel coding

[0037] - 38.213: Physical layer procedures for control

[0038] - 38.214: Physical layer procedures for data

[0039] - 38.300: NR and NG-RAN Overall description

[0040] - 38.331: Radio Resource Control (RRC) Protocol Specification

[0041] Figure 1 A radio frame structure for NR is shown.

[0042] In NR, UL and DL transmissions are configured in frames. Each radio frame has a length of 10 ms and is divided into two 5 ms half-frames. Each half-frame is divided into five 1 ms subframes. 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 includes 12 or 14 OFDM(A) symbols depending on the cyclic prefix (CP). When normal CP is used, each slot includes 14 OFDM symbols. When extended CP is used, each slot includes 12 OFDM symbols. A symbol can include an OFDM symbol (or CP-OFDM symbol) and a SC-FDMA symbol (or discrete Fourier transform-spread-OFDM (DFT-s-OFDM) symbol).

[0043] Table 1 exemplarily shows that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS in the case of normal CP.

[0044] [Table 1]

[0045] SCS (15*2^u) N slot symb ]] N frame，u slot ]]> N subframe，u slot ]]> 15 KHz (u=0) 14 10 1 30 KHz (u=1) 14 20 2 60 KHz (u=2) 14 40 4 120 KHz (u=3) 14 80 8 240 KHz (u=4) 14 160 16

[0046] *N slot symb : Number of symbols in a slot

[0047] *N frame，u slot : Number of slots in a frame

[0048] *N subframe，u slot : Number of slots in a subframe

[0049] Table 2 shows that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS in the case of extended CP.

[0050] [Table 2]

[0051] SCS (15*2^u) N slot symb ]]> N frame，u slot ]]> N subframe，u slot ]] 60 KHz (u=2) 12 40 4

[0052] In the NR system, different OFDM(A) numerology sets (e.g., SCS, CP length, etc.) can be configured for multiple cells aggregated for one UE. Thus, the (absolute time) duration of a time resource (e.g., subframe, slot, or transmission time interval (TTI)) consisting of the same number of symbols (for convenience, referred to as a time unit (TU)) can be configured differently among the aggregated cells.

[0053] In the NR, various numerologies (or SCSs) can be supported to support various 5th generation (5G) services. For example, for a 15 kHz SCS, a wide area in a legacy cellular band can be supported, while for a 30 kHz or 60 kHz SCS, a dense urban, lower latency, and wide carrier bandwidth can be supported. For a 60 kHz or higher SCS, a bandwidth greater than 24.25 kHz can be supported to overcome phase noise.

[0054] The NR band can be defined by two types of frequency ranges, FR1 and FR2. FR1 and FR2 can be configured as described in Table 3 below. FR2 can be millimeter wave (mmW).

[0055] [Table 3]

[0056] Frequency Range Designation Corresponding Frequency Range Subcarrier Spacing FR1 450 MHz - 7125 MHz 15, 30, 60 kHz FR2 24250 MHz - 52600 MHz 60, 120, 240 kHz

[0057] Figure 2 A resource grid is shown for the duration of one slot.

[0058] A slot includes multiple symbols in the time domain. For example, one slot includes 14 symbols in the normal CP case and 12 symbols in the extended CP case. A carrier includes multiple subcarriers in the frequency domain. A resource block (RB) can be defined by multiple (e.g., 12) consecutive subcarriers in the frequency domain. Multiple RB interlaces (interlaces for short) can be defined in the frequency domain. An interlace m e {0, 1, …, M-1} can consist of (common) RBs {m, M+m, 2M+m, 3M+m, …}. M denotes the number of interlaces. A bandwidth part (BWP) can be defined by multiple consecutive (physical) RBs ((P)RBs) in the frequency domain and corresponds to one numerology (e.g., SCS, CP length, etc.). A carrier can include up to N (e.g., five) BWPs. Data communication can be made in an active BWP, and only one BWP can be enabled for one UE. Each element in the resource grid can be referred to as a resource element (RE) to which one complex symbol can be mapped.

[0059] In a wireless communication system, a UE receives information from a BS in a downlink (DL) and transmits information to the BS in an uplink (UL). Information exchanged between the BS and the UE includes data and various control information, and there are various physical channels / signals according to the type / use of information exchanged therebetween. A physical channel corresponds to a set of resource elements (REs) that carry information derived from a higher layer. A physical signal corresponds to a set of REs used by the physical layer but does not carry information derived from a higher layer. The higher layer includes a medium access control (MAC) layer, a radio link control (RLC) layer, a packet data convergence protocol (PDCP) layer, a radio resource control (RRC) layer, etc.

[0060] A DL physical channel includes a physical broadcast channel (PBCH), a physical downlink shared channel (PDSCH), and a physical downlink control channel (PDCCH). A DL physical signal includes a DL reference signal (RS), a primary synchronization signal (PSS), and a secondary synchronization signal (SSS). A DL RS includes a demodulation reference signal (DM-RS), a phase-tracking reference signal (PT-RS), and a channel state information reference signal (CSI-RS). A UL physical channel includes a physical random access channel (PRACH), a physical uplink shared channel (PUSCH), and a physical uplink control channel (PUCCH). A UL physical signal includes a UL RS. A UL RS includes a DM-RS, a PT-RS, and a sounding reference signal (SRS).

[0061] Figure 3 A structure of a self-contained slot is shown.

[0062] In an NR system, a frame has a self-contained structure in which a DL control channel, DL or UL data, a UL control channel, etc. can all be contained in one slot. For example, the first N symbols in a slot (hereinafter, a DL control region) can be used to transmit a DL control channel, and the last M symbols in the slot (hereinafter, a UL control region) can be used to transmit a UL control channel. N and M are integers greater than or equal to 0. A resource region (hereinafter, a data region) between the DL control region and the UL control region can be used for DL data transmission or UL data transmission. For example, the following configuration can be considered. The respective parts are listed in time order.

[0063] In the disclosure, a base station (BS) can be, for example, a gNode B (gNB)

[0064] DL Physical Channels / Signals

[0065] (1) PDSCH

[0066] The PDSCH carries DL data (e.g., DL shared channel transport block (DL-SCH TB)). The TB is encoded into a codeword (CW), which is then transmitted after scrambling and modulation processing. The CW includes one or more code blocks (CB). One or more CBs can be grouped into a code block group (CBG). Depending on the configuration of the cell, the PDSCH can carry up to two CWs. Scrambling and modulation can be performed for each CW, and the modulation symbols generated from each CW can be mapped to one or more layers. Each layer can be mapped to resources with DMRS after precoding, and transmitted on a corresponding antenna port. The PDSCH can be dynamically scheduled by the PDCCH (dynamic scheduling). Alternatively, the PDSCH can be semi-statically scheduled based on higher layer (e.g., RRC) signaling (and / or layer 1 (L1) signaling (e.g., PDCCH)) (configured scheduling (CS)). Thus, in dynamic scheduling, the PDSCH transmission is accompanied by the PDCCH, while in CS, the PDSCH transmission can not be accompanied by the PDCCH. The CS can include semi-persistent scheduling (SPS).

[0067] (2) PDCCH

[0068] The PDCCH carries downlink control information (DCI). For example, the PDCCH (i.e., DCI) can carry: a transport format and resource allocation of the DL-SCH; frequency / time resource allocation information on an uplink shared channel (UL-SCH); paging information on a paging channel (PCH); system information on the DL-SCH; time / frequency resource allocation information about a higher layer control message such as a random access response (RAR) transmitted through the PDSCH; a transmit power control command; and information about activation / deactivation of SPS / CS. Various DCI formats can be provided depending on the information in the DCI.

[0069] Table 4 shows the DCI formats transmitted through the PDCCH.

[0070] [Table 4]

[0071]

[0072] DCI format 0_0 can be used for scheduling TB (or TB-level) based PUSCH, and DCI format 0_1 can be used for scheduling TB (or TB-level) based PUSCH or CBG (or CBG-level) based PUSCH. DCI format 1_0 can be used for scheduling TB (or TB-level) based PDSCH, and DCI format 1_1 can be used for scheduling TB (or TB-level) based PDSCH or CBG (or CBG-level) based PDSCH (DL grant DCI). DCI format 0_0 / 0_1 can be referred to as UL grant DCI or UL scheduling information, and DCI format 1_0 / 1_1 can be referred to as DL grant DCI or UL scheduling information. DCI format 2_0 can be used for providing dynamic slot format information (e.g., dynamic SFI) to a UE, and DCI format 2_1 can be used for providing downlink pre-emption information to a UE. UEs defined as one group can be provided with DCI format 2_0 and / or DCI format 2_1 on a group common PDCCH, which is a PDCCH defined for a UE group.

[0073] A PDCCH / DCI can include a cyclic redundancy check (CRC), and the CRC can be masked / scrambled with various identifiers (e.g., radio network temporary identifiers (RNTIs)) according to the owner or the purpose of the PDCCH. For example, if the PDCCH is for a specific UE, a cell RNTI (C-RNTI) can be used to mask the CRC. If the PDCCH is related to paging, a paging RNTI (P-RNTI) can be used to mask the CRC. If the PDCCH is related to system information (e.g., system information block (SIB)), a system information RNTI (SI-RNTI) can be used to mask the CRC. If the PDCCH is related to a random access response, a random access RNTI (RA-RNTI) can be used to mask the CRC.

[0074] Table 5 shows the usage and transmission channels of PDCCHs according to RNTI types. Here, the transmission channel means a transmission channel related to data carried by a PDSCH / PUSCH scheduled by the PDCCH.

[0075] [Table 5]

[0076]

[0077] For a PDCCH, a fixed modulation scheme (e.g., quadrature phase shift keying (QPSK)) can be used. One PDCCH can include 1, 2, 4, 8, or 16 control channel elements (CCEs) depending on an aggregation level (AL). One CCE can include 6 resource element groups (REGs), and one REG can be defined by one OFDMA symbol and one (P)RB.

[0078] The PDCCH can be transmitted in a control resource set (CORESET). The CORESET corresponds to a set of physical resources / parameters used to carry the PDCCH / DCI within the BWP. For example, the CORESET can include a set of REGs with a given numerology (e.g., SCS, CP length, etc.). The CORESET can be configured by system information (e.g., MIB) or UE-specific higher layer (e.g., RRC) signaling. For example, the following parameters / information can be used to configure the CORESET. One UE can be configured with one or more CORESETs, and multiple CORESETs can overlap in the time / frequency domain.

[0079] - controlResourceSetld: This parameter / information indicates an identifier (ID) of the CORESET.

[0080] - frequencyDomainResources: This parameter / information indicates frequency domain resources of the CORESET. The frequency domain resources can be indicated by a bitmap, and each bit corresponds to a RB group (= 6 consecutive RBs). For example, the most significant bit (MSB) of the bitmap corresponds to the first RB group in the BWP. The RB group corresponding to the bit with the value 1 can be allocated as the frequency domain resources of the CORESET.

[0081] - duration: This parameter / information indicates time domain resources of the CORESET. The parameter / information duration can indicate the number of consecutive OFDMA symbols included in the CORESET. For example, the duration has a value of 1-3.

[0082] - cce-REG-MappingType: This parameter / information indicates a mapping type of CCE to REG. The interleaved type and non-interleaved type can be supported.

[0083] - precoderGranullarity: This parameter / information indicates a precoder granularity in the frequency domain.

[0084] - tci-StatesPDCCH: This parameter / information indicates information (e.g., TCI-StateID) on transmission configuration indication (TCI) states for the PDCCH. The TCI state can be used to provide a quasi co-location (QCL) relationship between DL RSs (TCI states) in a set of RSs and the PDCCH DMRS port.

[0085] - tci-PresentInDCI: This parameter / information indicates whether the TCI field is included in the DCI.

[0086] - pdcch-DMRS-ScramblingID: This parameter / information indicates information for initialization of PDCCH DMRS scrambling sequence.

[0087] For PDCCH reception, a UE can monitor (e.g., blind decode) a set of PDCCH candidates in a CORESET. A PDCCH candidate can mean a CCE monitored by a UE for PDCCH reception / detection. PDCCH monitoring can be performed in one or more CORESETs in an active DL BWP on each active cell where PDCCH monitoring is configured. The set of PDCCH candidates monitored by a UE can be defined as a PDCCH search space (SS) set. A SS set can be categorized as a common search space (CSS) set or a UE-specific search space (USS) set.

[0088] Table 6 shows PDCCH search spaces.

[0089] [Table 6]

[0090]

[0091] A SS set can be configured by system information (e.g., MIB) or UE-specific higher layer (e.g., RRC) signaling. S (e.g., 10) or fewer SS sets can be configured in each DL BWP of a serving cell. For example, the following parameters / information can be provided for each SS set. Each SS set can be associated with one CORESET, and each CORESET configuration can be associated with one or more SS sets.

[0092] - searchSpaceId: This parameter / information indicates an ID of a SS set.

[0093] - controlResourceSetId: This parameter / information indicates a CORESET associated with a SS set.

[0094] - monitoringSlotPeriodicityAndOffset: This parameter / information indicates a PDCCH monitoring periodicity (in units of slots) and a PDCCH monitoring offset (in units of slots).

[0095] - monitoringSymbolsWithinSlot: This parameter / information indicates the first OFDMA symbols for PDCCH monitoring in a slot in which PDCCH monitoring is configured. The first OFDMA symbols are indicated by a bitmap, and each bit corresponds to each OFDMA symbol in a slot. The MSB of the bitmap corresponds to the first OFDM symbol in a slot. The OFDMA symbol corresponding to a bit with a value of 1 corresponds to the first symbol in a CORESET in a slot.

[0096] - nrofCandidates: This parameter / information indicates the number of PDCCH candidates per AL (where AL = {1, 2, 4, 8, 16}) (e.g., one of 0, 1, 2, 3, 4, 5, 6, and 8).

[0097] - searchSpaceType: This parameter / information indicates whether the SS type is CSS or USS.

[0098] - DCI format: This parameter / information indicates the DCI format of the PDCCH candidate.

[0099] A UE can monitor PDCCH candidates in one or more SS sets of a slot according to the configuration of the CORESET / SS set. The occasion (e.g., time / frequency resources) to monitor the PDCCH candidate is defined as a PDCCH (monitoring) occasion. One or more PDCCH (monitoring) occasions can be configured within a slot.

[0100] UL Physical Channels / Signals

[0101] (1) PUSCH

[0102] A PUSCH can carry UL data (e.g., uplink shared channel (UL-SCH) transport block (TB)) and / or uplink control information (UCI). The PUSCH can be transmitted based on a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform or a discrete Fourier transform spread OFDM (DFT-s-OFDM) waveform. When the PUSCH is transmitted based on the DFT-s-OFDM waveform, the UE can transmit the PUSCH by applying transform precoding. For example, when transform precoding is not allowed (e.g., when transform precoding is disabled), the UE can transmit the PUSCH based on the CP-OFDM waveform. When transform precoding is allowed (e.g., when transform precoding is enabled), the UE can transmit the PUSCH based on the CP-OFDM waveform or the DFT-s-OFDM waveform. The PUSCH transmission can be dynamically scheduled by a PDCCH (dynamic scheduling) or semi-statically scheduled by higher layer signaling (e.g., RRC signaling) (and / or layer 1 (L1) signaling (e.g., PDCCH)) (configured scheduling (CS)). Thus, in dynamic scheduling, the PUSCH transmission can be associated with the PDCCH, while in CS, the PUSCH transmission can not be associated with the PDCCH. The CS can include a PUSCH transmission based on a type 1 configured grant (CG) and a PUSCH transmission based on a type 2 CG. For the type 1 CG, all parameters for the PUSCH transmission can be signaled by a higher layer. For the type 2 CG, some parameters for the PUSCH transmission can be signaled by a higher layer, and the rest can be signaled through a PDCCH. Basically, in CS, the PUSCH transmission can not be associated with the PDCCH.

[0103] (2) PUCCH

[0104] A PUCCH can carry UCI. The UCI includes the following information.

[0105] - Scheduling Request (SR): The SR is information for requesting a UL-SCH resource.

[0106] - Hybrid automatic repeat request acknowledgement (HARQ-ACK): The HARQ-ACK is a signal responding to reception of a DL signal (e.g., PDSCH, SPS release PDCCH, etc.). The HARQ-ACK response can include a positive ACK (ACK), a negative ACK (NACK), DTX (discontinuous transmission), or NACK / DTX. The HARQ-ACK can be used interchangeably with A / N, ACK / NACK, HARQ-ACK / NACK, etc. The HARQ-ACK can be generated based on a TB / CBG.

[0107] - Channel State Information (CSI): The CSI is feedback information about a DL channel. The CSI includes a Channel Quality Indicator (CQI), a Rank Indicator (RI), a Precoding Matrix Indicator (PMI), a Precoding Type Indicator (PTI), etc.

[0108] Table 7 shows PUCCH formats. The PUCCH format can be classified according to a UCI payload size / transmission length (e.g., a number of symbols included in a PUCCH resource) and / or a transmission structure. The PUCCH format can be classified into a short PUCCH format (PUCCH formats 0 and 2) and a long PUCCH format (PUCCH formats 1, 3, and 4) according to the transmission length.

[0109] [Table 7]

[0110]

[0111] (0) PUCCH format 0 (PF0)

[0112] - Supportable UCI payload size: up to K bits (e.g., K = 2)

[0113] - Number of OFDM symbols included in one PUCCH: 1 to X symbols (e.g., X = 2)

[0114] - Transmission structure: only a UCI signal is configured without a DM-RS, and a UCI state is transmitted by selecting and transmitting one of a plurality of sequences.

[0115] (1) PUCCH format 1 (PF1)

[0116] - Supportable UCI payload size: up to K bits (e.g., K = 2)

[0117] - Number of OFDM symbols included in one PUCCH: Y to Z symbols (e.g., Y = 4 and Z = 14)

[0118] - Transmission structure: a UCI and a DM-RS are configured in different OFDM symbols based on time division multiplexing (TDM). For the UCI, a specific sequence is multiplied by a modulation symbol (e.g., a QPSK symbol). A cyclic shift / quadrature cover code (CS / OCC) is applied to both the UCI and the DM-RS to support code division multiplexing (CDM) between a plurality of PUCCH resources (complying with PUCCH format 1) (in the same RB).

[0119] (2) PUCCH format 2 (PF2)

[0120] - Supportable UCI payload size: more than K bits (e.g., K = 2)

[0121] - Number of OFDM symbols included in one PUCCH: 1 to X symbols (e.g., X = 2)

[0122] - Transmission structure: UCI and DMRS (DM-RS) are configured / mapped to the same symbol based on frequency division multiplexing (FDM) and the encoded UCI bits are transmitted by applying inverse fast Fourier transform (IFFT) to them only without DFT.

[0123] (3) PUCCH format 3 (PF3)

[0124] - Supportable UCI payload size: more than K bits (e.g., K = 2)

[0125] - Number of OFDM symbols included in one PUCCH: Y to Z symbols (e.g., Y = 4 and Z = 14)

[0126] - Transmission structure: UCI and DMRS are configured / mapped to different symbols based on TDM. The encoded UCI bits are transmitted by applying DFT to them. To support multiplexing between multiple UEs, OCC is applied to UCI and CS (or interleaved frequency division multiplexing (IFDM) mapping) is applied to DM-RS before DFT.

[0127] (4) PUCCH format 4 (PF4)

[0128] - Supportable UCI payload size: more than K bits (e.g., K = 2)

[0129] - Number of OFDM symbols included in one PUCCH: Y to Z symbols (e.g., Y = 4 and Z = 14)

[0130] - Transmission structure: UCI and DMRS are configured / mapped to different symbols based on TDM. DFT is applied to the encoded UCI bits without multiplexing between UEs.

[0131] Figure 4 An ACK / NACK transmission procedure is shown. Referring to Figure 4 , a UE can detect a PDCCH in slot #n. The PDCCH includes DL scheduling information (e.g., DCI format 1_0 or DCI format 1_1). The PDCCH indicates a DL assignment to a PDSCH offset K0 and a PDSCH to HARQ-ACK report offset K1. For example, the DCI format 1_0 or DCI format 1_1 can include the following information.

[0132] - Frequency domain resource assignment: indicates a set of RBs assigned to the PDSCH.

[0133] - Time domain resource assignment: indicates K0 and the starting position (e.g., OFDM symbol index) and length (e.g., number of OFDM symbols) of the PDSCH in a slot.

[0134] - PDSCH-to-HARQ_feedback timing indicator: indicates K1.

[0135] After receiving the PDSCH in slot #(n+K0) according to the scheduling information of slot #n, the UE can transmit the UCI on the PUCCH in slot #(n+K1). The UCI includes the HARQ-ACK response to the PDSCH. In the case where the PDSCH is configured to carry one TB at maximum, the HARQ-ACK response can be configured in one bit. In the case where the PDSCH is configured to carry up to two TBs, the HARQ-ACK response can be configured in two bits if spatial bundling is not configured, or in one bit if spatial bundling is configured. When slot #(n+K1) is designated as the HARQ-ACK transmission timing for multiple PDSCHs, the UCI transmitted in slot #(n+K1) includes the HARQ-ACK responses to the multiple PDSCHs.

[0136] 1. Wireless communication system supporting unlicensed band

[0137] Figure 5 An exemplary wireless communication system suitable for supporting a license-exempt band according to this disclosure is shown.

[0138] In the following description, a cell operating in a licensed band (L band) is defined as an L cell, and a carrier of the L cell is defined as a (DL / UL) L CC. A cell operating in a license-exempt band (U band) is defined as a U cell, and a carrier of the U cell is defined as a (DL / UL) U CC. A carrier / carrier frequency of a cell can refer to an operating frequency (e.g., center frequency) of the cell. A cell / carrier (e.g., CC) is often referred to as a cell.

[0139] When the BS and the UE transmit and receive signals on the L CC and the U CC in carrier aggregation as shown in (a) of FIG. 1, Figure 5 The L CC and the U CC can be configured as a primary CC (PCC) and a secondary CC (SCC), respectively, when the BS and the UE transmit and receive signals on the L CC and the U CC in carrier aggregation as shown in (a) of FIG. 1, Figure 5 The BS and the UE can transmit and receive signals on one U CC or on multiple U CCs in carrier aggregation as shown in (b) of FIG. 1. In other words, the BS and the UE can transmit and receive signals only on the U CC without using any L CC. For SA operation, PRACH, PUCCH, PUSCH, and SRS transmissions can be supported on the U Cell.

[0140] The signal transmission and reception operations in the unlicensed band as described in this disclosure can be applied to the above deployment scenarios (unless otherwise indicated).

[0141] The following definitions apply to the terms used in this disclosure, unless otherwise indicated.

[0142] - Channel: a carrier or a portion of a carrier consisting of an adjacent set of RBs performing a Channel Access Procedure (CAP) in a shared spectrum.

[0143] - Channel Access Procedure (CAP): a procedure to assess channel availability based on sensing prior to signal transmission in order to determine whether other communicating nodes are using the channel. The basic sensing unit is a sensing slot with duration T sl = 9us. The BS or UE senses the slot during the sensing slot duration. When the power detected for at least 4us within the sensing slot duration is less than an energy detection threshold X thresh , the sensing slot duration T sl is considered as idle. Otherwise, the sensing slot duration T sl is considered as busy. The CAP can also be referred to as Listen Before Talk (LBT).

[0144] - Channel occupancy: a transmission from a BS / UE on a channel after a CAP.

[0145] - Channel Occupancy Time (COT): the total time a BS / UE and any BS / UE sharing the channel occupancy performs transmissions on the channel after a CAP. With respect to COT determination, if a transmission gap is less than or equal to 25us, the gap duration can be counted into the COT. The COT can be shared for transmissions between a BS and the corresponding UE.

[0146] - DL transmission burst: a set of transmissions from a BS without any gap larger than 16us. Transmissions from a BS separated by a gap larger than 16us are considered as separate DL transmission bursts. The BS can perform transmissions after a gap without sensing the channel available within a DL transmission burst.

[0147] - UL transmission burst: a set of transmissions from a UE without any gap larger than 16us. Transmissions from a UE separated by a gap larger than 16us are considered as separate UL transmission bursts. The UE can perform transmissions after a gap without sensing the channel available within a UL transmission burst.

[0148] - Discovery burst: A DL transmission burst including a set of signals and / or channels confined within a window and associated with a duty cycle. The discovery burst can include transmissions initiated by the BS including PSS, SSS, and cell-specific RS (CRS), and also including non-zero-power CSI-RS. In NR systems, the discovery burst can include transmissions initiated by the BS including at least SS / PBCH block and also including CORESET for PDCCH scheduling PDSCH carrying SIB1, PDSCH carrying SIB1, and / or non-zero-power CSI-RS.

[0149] Figure 6 A method of resource occupation in the U-band is shown. According to the regional regulation of the U-band, a communication node in the U-band needs to determine whether the channel is used by other communication nodes before transmitting a signal. Specifically, the communication node can perform carrier sensing (CS) before transmitting a signal to check whether other communication nodes perform signal transmission. When other communication nodes do not perform signal transmission, it can be said that a clear channel assessment (CCA) is performed. When the CCA threshold is predefined or configured by higher layer signaling (e.g., RRC signaling), if the detected channel energy is higher than the CCA threshold, the communication node can determine that the channel is busy. Otherwise, the communication node can determine that the channel is idle. The Wi-Fi standard (802.11ac) specifies a CCA threshold of -62 dBm for non-Wi-Fi signals and a CCA threshold of -82 dBm for Wi-Fi signals. When the channel is determined to be idle, the communication node can start signal transmission in the UCell. The above-mentioned process can be referred to as listen before talk (LBT) or channel access procedure (CAP) in its entirety. LBT, CAP, and CCA are used interchangeably in this document.

[0150] Specifically, for DL reception / UL transmission in the U-band, at least one of the following CAP methods described below can be employed in the wireless communication system according to the present disclosure.

[0151] DL signal transmission method in U band

[0152] The BS can perform one of the following U-band access procedures (e.g., CAP) for DL signal transmission in the U-band.

[0153] (1) Type 1 DL CAP method

[0154] In the Type 1 DL CAP, the length of the duration spanned by the sensing time slots that are sensed to be idle before transmission can be random. The Type 1 DL CAP can be applied to the following transmissions:

[0155] - a transmission initiated by the BS including (i) a unicast PDSCH with user plane data or (ii) a unicast PDCCH scheduling user plane data in addition to a unicast PDSCH with user plane data, or

[0156] - a transmission initiated by the BS including (i) a discovery burst only or (ii) a discovery burst multiplexed with non-unicast information.

[0157] Figure 7 is a flowchart illustrating a CAP operation performed by the BS to transmit a DL signal in the U-band.

[0158] Referring to Figure 7 , the BS can sense whether the channel is idle for a sensing slot duration of a defer duration T d . Then, if the counter N is zero, the BS can perform a transmission (S1234). In this case, the BS can adjust the counter N by sensing the channel for an additional sensing slot duration according to the following steps:

[0159] Step 1) (S1220) the BS sets N to N init (N = N init ), where N init is a random number uniformly distributed between 0 and CW p . Then, Step 4 is performed.

[0160] Step 2 (S1240) if N > 0 and the BS determines to decrease the counter, the BS sets N to N - 1 (N = N - 1).

[0161] Step 3) (S1250) the BS senses the channel for an additional sensing slot duration. If the additional sensing slot duration is idle (Yes), Step 4 is performed. Otherwise (No), Step 5 is performed.

[0162] Step 4) (S1230) if N = 0 (Yes), the BS terminates the CAP (S1232). Otherwise (No), Step 2 is performed.

[0163] Step 5) (S1260) the BS senses the channel until a busy sensing slot is detected within an additional defer duration T d or all slots of the additional defer duration T d are detected to be idle.

[0164] Step 6) (S1270) if the channel is sensed to be idle for all slot durations of the additional defer duration T d (Yes), Step 4 is performed. Otherwise (No), Step 5 is performed.

[0165] Table 8 illustrates mp , minimum contention window (CW), maximum CW, maximum channel occupancy time (MCOT), and allowed CW sizes vary according to channel access priority class.

[0166] [Table 8]

[0167]

[0168] defer duration T d is configured in the following order: duration T f (16us) + m p consecutive sensing slot durations T sl (9us). T f includes a sensing slot duration T sl at the beginning of the 16us duration.

[0169] satisfies the following relationship: CW min,p < = CW p < = CW max,p . CW p may be initialized by CW p = CW min,p initially and updated (CW size update) based on HARQ-ACK feedback (e.g., ACK or NACK) for a previous DL burst (e.g., PDSCH) before step 1. For example, CW p may be initialized to CW min,p based on HARQ-ACK feedback for a previous DL burst. Alternatively, CW p may be increased to the next highest allowed value or maintained as is.

[0170] (2) Type 2 DL CAP method

[0171] In Type 2 DL CAP, the length of the duration spanned by the sensing slots that are determined to be idle before transmission can be determined. Type 2 DL CAP is classified as Type 2A / 2B / 2C DL CAP.

[0172] Type 2A DL CAP can apply to the following transmissions. In Type 2A DL CAP, the BS can perform transmission immediately after the channel is sensed to be idle for at least a sensing duration T short_dl = 25us. Here, T short_dl includes a duration T f (= 16us) and one sensing slot duration immediately after the duration T f , where the duration T f includes a sensing slot at its beginning.

[0173] - a transmission initiated by the BS including (i) a discovery burst only or (ii) a discovery burst multiplexed with non-unicast information, or

[0174] - a transmission by the BS after a 25us gap relative to a transmission by the UE within a shared channel occupancy.

[0175] Type 2B DL CAP applies to a transmission by the BS after a 16us gap relative to a transmission by the UE within a shared channel occupancy time. In Type 2B DL CAP, the BS can perform the transmission immediately after the channel is sensed to be idle within T f = 16us. Type 2C DL CAP applies to a transmission by the BS after at most 16us relative to a transmission by the UE within a shared channel occupancy time. In Type 2C DL CAP, the BS does not perform channel sensing before performing the transmission. f includes a sensing slot within 9us relative to the end of the duration. Type 2C DL CAP applies to a transmission by the BS after at most 16us relative to a transmission by the UE within a shared channel occupancy time. In Type 2C DL CAP, the BS does not perform channel sensing before performing the transmission.

[0176] UL signal transmission method in U band

[0177] A UE can perform Type 1 or Type 2 CAP for UL signal transmission in the U band. Typically, the UE can perform a CAP (e.g., Type 1 or Type 2) configured by the BS for UL signal transmission. For example, an UL grant (e.g., DCI format 0_0 and 0_1) scheduling a PUSCH transmission can include CAP type indication information for the UE.

[0178] (1) Type 1 UL CAP method

[0179] In Type 1 UL CAP, the length of the duration over which the sensing slot is sensed to be idle before the transmission is random. Type 1 UL CAP can apply to the following transmissions.

[0180] - PUSCH / SRS transmission scheduled and / or configured by the BS

[0181] - PUCCH transmission scheduled and / or configured by the BS

[0182] - Transmission related to random access procedure (RAP)

[0183] Figure 8 is a flowchart illustrating a CAP operation performed by a UE to transmit an UL signal.

[0184] Referring to Figure 8 , the UE can sense the channel to be idle within a defer duration T dwhether the channel is idle for the additional sensing slot duration. Then, if the counter N is zero, the UE can perform the transmission (S1534). In this case, the UE can adjust the counter N by sensing the channel for the additional sensing slot duration according to the following steps:

[0185] Step 1) (S1520) The UE sets N to N init (N = N init ), where N init is a random number uniformly distributed between 0 and CW p . Then, Step 4 is performed.

[0186] Step 2) (S1540) If N > 0 and the UE determines to decrease the counter, the UE sets N to N - 1 (N = N - 1).

[0187] Step 3) (S1550) The UE senses the channel for the additional sensing slot duration. If the additional sensing slot duration is idle (Yes), Step 4 is performed. Otherwise (No), Step 5 is performed.

[0188] Step 4) (S1530) If N = 0 (Yes), the UE terminates the CAP (S1532). Otherwise (No), Step 2 is performed.

[0189] Step 5) (S1560) The UE senses the channel until a busy sensing slot is detected within the additional defer duration T d or all slots of the additional defer duration T d are detected to be idle.

[0190] Step 6) (S1570) If the channel is sensed to be idle for all slot durations of the additional defer duration T d (Yes), Step 4 is performed. Otherwise (No), Step 5 is performed.

[0191] Table 9 shows that m p , minimum CW, maximum CW, MCOT, and allowed CW size for the CAP vary according to the channel access priority class.

[0192] [Table 9]

[0193]

[0194] The defer duration T d is configured in the following order: duration T f (16us) + m p consecutive sensing slot durations T sl (9us). T f includes the sensing slot duration Tsl .

[0195] satisfies the following relation: CW min,p < = CW p < = CW max,p . CW p may be initialized to CW p = CW min,p initially configured and updated (CW size update) based on explicit / implicit reception response to previous UL burst (e.g., PUSCH) before step 1. For example, CW p may be initialized to CW min,p based on explicit / implicit reception response to previous UL burst. Alternatively, CW p may be increased to the next highest allowed value or maintained as is.

[0196] (2) Type 2 UL CAP method

[0197] In Type 2 UL CAP, the length of the duration spanning the sensing slots that are sensed as idle before transmission can be determined. Type 2 UL CAP is classified as Type 2A / 2B / 2C UL CAP. In Type 2A UL CAP, the UE can perform transmission immediately after the channel is sensed as idle within sensing duration T short_dl = 25us. Here, T short_dl includes the duration T f (= 16us) and one sensing slot duration immediately after the duration T f . In Type 2A UL CAP, T f includes the sensing slot at its beginning. In Type 2B UL CAP, the UE can perform transmission immediately after the channel is sensed as idle within sensing duration T f = 16us. In Type 2B UL CAP, T f includes the sensing slot within 9us relative to the end of the duration. In Type 2C UL CAP, the UE does not perform channel sensing before performing transmission.

[0198] RB Interleaving

[0199] Figure 9 RB interlace is shown. In shared spectrum, considering the regulations on occupied channel bandwidth (OCB) and power spectral density (PSD), a set of non-contiguous RBs (at regular intervals) (or a single RB) in frequency domain can be defined as a resource unit for / allocated as transmitting UL (physical) channel / signal. For convenience, such a set of non-contiguous RBs is defined as RB interlace (or interlace).

[0200] Referring to Figure 9 A plurality of RB interlaces (interlaces) can be defined in a frequency bandwidth. Here, the frequency bandwidth can include a (wideband) cell / CC / BWP / RB set, and the RB can include a PRB. For example, interlace #m∈{0,1,...,M-1} can consist of (common) RBs {m,M+m,2M+m,3M+m,...}, where M denotes the number of interlaces. A transmitter (e.g., a UE) can transmit a signal / channel using one or more interlaces. The signal / channel can include a PUCCH or a PUSCH.

[0201] 2. Random access procedure

[0202] Figure 10 A random access procedure is shown. Figure 10 (a) shows a contention-based random access procedure, and Figure 10 (b) shows a dedicated random access procedure.

[0203] Referring to Figure 10 (a), the contention-based random access procedure includes the following four steps. Messages transmitted in steps 1 to 4 can be called message 1 (Msg1) to message 4 (Msg4), respectively.

[0204] - Step 1: The UE transmits a RACH preamble on a PRACH.

[0205] - Step 2: The UE receives a random access response (RAR) from the BS on a DL-SCH.

[0206] - Step 3: The UE transmits a layer 2 (L2) / layer 3 (L3) message to the BS on a UL-SCH.

[0207] - Step 4: The UE receives a contention resolution message from the BS on a DL-SCH.

[0208] The UE can receive random access information in system information from the BS.

[0209] When the UE needs random access, the UE transmits a RACH preamble to the BS as in step 1, and the BS can identify each RACH preamble by a time / frequency resource (RACH occasion (RO)) in which the RACH preamble is transmitted and a preamble index (PI).

[0210] After receiving the RACH preamble from the UE, the BS transmits a RAR message to the UE as in step 2. To receive the RAR message, the UE monitors a L1 / L2 PDCCH with a cyclic redundancy check (CRC) masked with a random access RNTI (RA-RNTI) for scheduling information for the RAR message within a pre-configured time window (e.g., ra-ResponseWindow). The PDCCH masked with the RA-RNTI can be transmitted only in a common search space. Upon receiving the scheduling signal masked with the RA-RNTI, the UE can receive the RAR message on a PDSCH indicated by the scheduling information. The UE then checks whether there is RAR information directed to the UE in the RAR message. The presence or absence of the RAR information directed to the UE can be determined by checking whether there is a random access preamble ID (RAPID) for the preamble transmitted by the UE. The index of the preamble transmitted by the UE can be the same as the RAPID. The RAR information includes an index of the corresponding RACH preamble, timing offset information (e.g., a timing advance command (TAC)) for UL synchronization, UL scheduling information (e.g., an UL grant) for Msg3 transmission, and UE temporary identification information (e.g., a temporary C-RNTI (TC-RNTI)).

[0211] Upon receiving the RAR information, the UE transmits UL-SCH data (Msg3) on a PUSCH according to the UL scheduling information and the timing offset value as in step 3. The Msg3 can include an ID (or a global ID) of the UE. Alternatively, the Msg3 can include RRC connection request related information (e.g., an RRCSetupRequest message) for initial access. In addition, the Msg3 can include a buffer status report (BSR) on an amount of data available for transmission at the UE.

[0212] Upon receiving the UL-SCH data, the BS transmits a contention resolution message (Msg4) to the UE as in step 4. When the UE receives the contention resolution message and the contention resolution is successful, the TC-RNTI is changed to a C-RNTI. The Msg4 can include an ID of the UE and / or RRC connection related information (e.g., an RRCSetup message). When the information transmitted in the Msg3 does not match the information received in the Msg4, or when the UE does not receive the Msg4 within a predetermined time, the UE can retransmit the Msg3, determining that the contention resolution is failed.

[0213] REFERENCE Figure 10(b), the dedicated random access procedure includes the following three steps. The messages transmitted in steps 0 to 2 can be called Msg0 to Msg2, respectively. The BS can trigger the dedicated random access procedure by a PDCCH serving the purpose of ordering the RACH preamble transmission (hereinafter, referred to as PDCCH order).

[0214] - Step 0: The BS assigns a RACH preamble to the UE by dedicated signaling.

[0215] - Step 1: The UE transmits the RACH preamble on the PRACH.

[0216] - Step 2: The UE receives the RAR from the BS on the DL-SCH.

[0217] Steps 1 and 2 of the dedicated random access procedure can be the same as those of the contention-based random access procedure.

[0218] In NR, DCI format 1_0 is used to initiate the non-contention-based random access procedure by the PDCCH order. The DCI format 1_0 is used to schedule the PDSCH in one DL cell. When the CRC of the DCI format 1_0 is scrambled with the C-RNTI and all bits of the “frequency domain resource assignment” field are 1, the DCI format 1_0 is used as the PDCCH order indicating the random access procedure. In this case, the fields of the DCI format 1_0 are configured as follows.

[0219] - RA preamble index: 6 bits

[0220] - UL / supplemental UL (SUL) indicator: 1 bit. When the bits of the RA preamble index are all non-zero and the SUL is configured for the UE in the cell, the UL / SUL indicator indicates the UL carrier in which the PRACH is transmitted in the cell. Otherwise, it is reserved.

[0221] - SSB (synchronization signal / physical broadcast channel) index: 6 bits. When the bits of the RA preamble index are all non-zero, the SSB indicator indicates the SSB used for determining the RACH occasion for the PRACH transmission. Otherwise, it is reserved.

[0222] - PRACH mask index: 4 bits. When the bits of the RA preamble index are all non-zero, the PRACH mask index indicates the RACH occasion associated with the SSB indicated by the SSB index. Otherwise, it is reserved.

[0223] - Reserved: 10 bits

[0224] When the DCI format 1_0 does not correspond to a PDCCH order, the DCI format 1_0 includes fields for scheduling a PDSCH (e.g., time domain resource assignment, modulation and coding scheme (MCS), HARQ process number, PDSCH-to-HARQ_feedback timing indicator, etc.).

[0225] 2-step random access procedure

[0226] In the prior art, random access is performed through a 4-step procedure as described above. In a conventional LTE system, the 4-step random access procedure takes an average of 15.5 ms.

[0227] [Table 10]

[0228]

[0229] An NR system can require lower latency than a conventional system. When random access occurs in the U-band, random access can be terminated, i.e., contention can be resolved, only when the UE and the BS successfully proceed with LBT sequentially in all steps of the 4-step random access procedure. If LBT fails even in one step of the 4-step random access procedure, resource efficiency can decrease, and latency can increase. If LBT fails in a scheduling / transmission procedure associated with Msg2 or Msg3, resource efficiency can significantly decrease, and latency can significantly increase. For random access in the L-band, low latency can be required in various scenarios of the NR system. Therefore, a 2-step random access procedure can also be performed in the L-band.

[0230] As Figure 11 As shown in (a), the 2-step random access procedure can include two steps: transmission of an UL signal from the UE to the BS (referred to as MsgA) and transmission of a DL signal from the BS to the UE (referred to as MsgB).

[0231] The following description focuses on an initial access procedure, but the proposed method can be equally applied to a random access procedure after the UE and the BS establish an RRC connection. In addition, as Figure 11 As shown in (b), a random access preamble and a PUSCH part can be transmitted together in a contention-free random access procedure.

[0232] Although not shown, the BS can transmit a PDCCH for scheduling MsgB to the UE, which can be referred to as a MsgB PDCCH.

[0233] 3. Random access procedure in U band

[0234] The above description (NR frame structure, RACH, U-band system, etc.) can be applied in combination with the method proposed in the present disclosure, which will be described later. Alternatively, the description can clarify the technical features of the method proposed in the present disclosure.

[0235] As described above, the Wi-Fi standard (802.11ac) specifies a CCA threshold of -62 dBm for a non-Wi-Fi signal and a CCA threshold of -82 dBm for a Wi-Fi signal. In other words, if a station (STA) or an access point (AP) of a Wi-Fi system receives a signal from a device not included in the Wi-Fi system at a power of -62 dBm or more in a specific frequency band, the STA or the AP can not transmit a signal in the specific frequency band.

[0236] A physical random access channel (PRACH) format can include a long RACH format and a short RACH format. A PRACH corresponding to the long RACH format consists of a sequence of length 839. A PRACH corresponding to the short RACH format consists of a sequence of length 139. Hereinafter, a structure of a sequence configured by the short RACH format is proposed. In a frequency range 1 (FR1) band of less than 6 GHz, an SCS of the short RACH format corresponds to 15 and / or 30 kHz. The PRACH corresponding to the short RACH format can be transmitted on 12 RBs, as Figure 10 indicated in Table 11. The 12 RBs include 144 REs, and the PRACH can be transmitted on 139 tones (139 REs) among the 144 REs. Figure 12 It is shown that two REs having the lowest indices and three REs having the highest indices among the 144 REs correspond to null tones. However, the positions of the null tones can be different from those shown in Figure 12 .

[0237] In the present disclosure, the short RACH format can be referred to as a short PRACH format, and the long RACH format can be referred to as a long PRACH format. The PRACH format can be referred to as a preamble format.

[0238] The short PRACH format can consist of values defined in Table 11.

[0239] [Table 11]

[0240]

[0241] In Table 11, L RA is the length of the RACH sequence, Δf RA is an SCS applied to the RACH, and κ = T s / T c= 64. For μ ∈ {0, 1, 2, 3}, μ is defined as one of 0, 1, 2, and 3 according to the SCS. For example, for 15 kHz SCS, μ is defined as 0, and for 30 kHz SCS, μ is defined as 1.

[0242] The BS can announce through higher layer signaling which PRACH format can be transmitted in a specific timing for a specific duration and how many ROs are in the corresponding slot. Tables 6.3.3.2-2 to 6.3.3.2-4 of the standard 38.211 correspond to this case. Table 12 shows only some specific excerpts from the index, which can use A1, A2, A3, B1, B2, or B3 or a combination thereof in Table 6.3.3.2-3 of the standard 38.211.

[0243] [Table 12]

[0244]

[0245] As can be seen from Table 12, how many ROs are defined for each preamble format in the RACH slot (see the number of time-domain PRACH occasions within the PRACH slot in Table 12), how many orthogonal frequency division multiplexing (OFDM) symbols are occupied by the PRACH preamble for each preamble format (see the PRACH duration in Table 12). In addition, the starting symbol of the first RO can be indicated for each preamble format, and thus information about the time point at which the RO starts in the RACH slot can be transmitted / received between the BS and the UE. Figure 13 It is shown how to configure the ROs in the RACH slot for each PRACH configuration index value of Table 12.

[0246] A device operating in an unlicensed band checks whether a channel on which a signal is to be transmitted is in an idle mode or a busy mode. When the channel is in the idle mode, the signal is transmitted on the channel. When the channel is in the busy mode, the device transmitting the signal waits until the channel transitions to the idle mode before transmitting the signal. As previously described with reference to Figure 6 and 7 Such an operation can be referred to as LBT or a channel access scheme. In addition, there can be LBT categories as shown in Table 13.

[0247] [Table 13]

[0248]

[0249] The LBT corresponding to Category 1 is a method of channel access without LBT. According to the LBT corresponding to Category 1, when the time gap from the time a specific node occupies a channel to the time immediately before the next transmission is shorter than 16us, the specific node can access the channel regardless of the mode. Next, Category 2 LBT is a method of accessing a channel after performing one-shot LBT without a backoff counter value. According to the LBT corresponding to Category 2, a specific node transmits after determining whether a channel is idle for 16us (or 25us).

[0250] For the LBT corresponding to Category 3 and Category 4, a backoff counter value is randomly selected within a contention window (CW). In the present disclosure, the LBT corresponding to Category 3 can be referred to as Cat 3 LBT, and the LBT corresponding to Category 4 can be referred to as Cat 4 LBT. For the LBT corresponding to Category 3, a backoff counter value is always randomly selected based on a fixed contention window size value. For the LBT corresponding to Category 4, the contention window size starts from an initial minimum contention window size value, and increases by 1 step among allowed candidates each time LBT fails. The maximum and minimum values of the contention window size and the allowed candidate contention window size values are predefined for each channel access priority category (see Tables 3 and 4). For example, in the case of Cat 4 LBT in which the channel access priority category is 4, a UE initially randomly selects a backoff counter value from 0 to 15. When the UE fails in LBT, it randomly selects a backoff counter value from 0 to 31.

[0251] When the channel is idle for 16+9×m p +K×9us, a UE selecting a backoff counter value based on the values defined in Table 9 performs an uplink transmission indicated and / or configured by a BS. K is the selected backoff counter value, and m p corresponding to a time slot applied according to a channel access priority category. The channel access priority category and the LBT category for PRACH transmission can be configured as shown in Table 14.

[0252] [Table 14]

[0253]

[0254] Based on the values derivable from Table 13 and Table 14, when the channel is idle for 16+9*2+K*9 (= 34+K*9)us, a UE can start PRACH transmission. As described above, a backoff counter value K is randomly selected within a contention window size that varies in size.

[0255] The above 2-step random access procedure includes transmitting a message A (including Msg.A, PRACH preamble, and Msg.3 PUSCH) from the UE and transmitting a message B (including Msg.B, RAR, and Msg.4 PDSCH) from the BS. For simplicity, in the present disclosure, a time and frequency resource in which the PRACH preamble signal of Msg.A is mapped / transmitted is defined as a RACH occasion (RO), and a time and frequency resource in which the Msg.3 PUSCH is mapped / transmitted is defined as a PUSCH occasion (PO). In the following description, a specific method of configuring Msg.A is proposed. The RACH preamble constituting Msg.A can be referred to as a Msg.A RACH preamble and a Msg.A PRACH. The Msg.3 PUSCH constituting Msg.A can be referred to as a Msg.A PUSCH. The RAR constituting Msg.B can be referred to as a Msg.B RAR. The Msg.4 PDSCH constituting Msg.B can be referred to as a Msg.B PDSCH.

[0256] Hereinafter, the operation of the UE proposed in the present disclosure for performing UL transmission using UL interlaces will be described.

[0257] (1) First, the UE receives UL interlace configuration information for UL transmission from the BS. The UL interlace configuration information can include information on UL interlace indices of UL interlaces satisfying OCB requirements defined for each SCS. (2) The UE determines at least one UL interlace based on the UL interlace configuration information. (3) The UE performs UL transmission to the BS on the determined at least one UL interlace.

[0258] In more detail, the method described below can be combined with the processes of operations (1) to (3) described above to achieve the purposes / effects proposed in the present disclosure. In addition, the method described below can be combined with the processes described in 2. Random Access procedure to achieve the purposes / effects proposed in the present disclosure. In the present disclosure, the term "unlicensed band" can be replaced with and used interchangeably with the term "shared spectrum".

[0259] 3.1 Embodiment 1: Frequency domain gap for Msg.A PUSCH transmission

[0260] As described above, the UE transmits Msg.A PUSCH after the RACH preamble included in Msg.A is transmitted through a predetermined PO. Assuming that the BS has configured a plurality of POs operatively connected to one RO (or a plurality of ROs) as consecutive interlaces existing in the same slot. When there are a plurality of UEs to transmit Msg.A PUSCH in the PO, the timing advance (TA) value configured for the plurality of UEs can be different from each other. As defined in the conventional system, there is no frequency gap between the consecutive interlaces. Accordingly, when the TA values of the Msg.A PUSCH transmitted by the plurality of UEs are different from each other, the Msg.A PUSCH reception performance of the BS can be deteriorated. In Embodiment 1, a method of preventing the Msg.A PUSCH reception performance from being deteriorated is proposed.

[0261] Proposed Method 1-1: Providing PRB-level frequency gap between consecutive interlaces

[0262] Option 1-1-1) Assigning a specific interlace index for Msg.A PUSCH transmission and excluding other specific interlace indexes from Msg.A PUSCH transmission

[0263] As an example, when 30kHz SCS is used, there can be a total of 5 interlace indexes in a 20MHz bandwidth. When the interlace indexes are #0, #1, #2, #3, and #4, the BS can define indexes #0, #2, and #4 as POs for Msg.A PUSCH transmission and exclude indexes #1 and #3 from Msg.A PUSCH transmission.

[0264] Option 1-1-2) Indicating a start PRB offset together with a specific interlace index (where the start PRB offset can be set to be smaller than the interlace PRB gap).

[0265] As an example, when 30kHz SCS is used, there can be a total of 5 interlace indexes in a 20MHz bandwidth. When the interlace indexes are #0, #1, #2, #3, and #4, the BS sets interlace index #0 as a PO for Msg.A PUSCH transmission and sets a start PRB offset to 0. In addition, the BS can set interlace index #1 as a PO for Msg.A PUSCH transmission and set a start PRB offset to 1 RB. In addition, the BS can set interlace index #2 as a PO for Msg.A PUSCH transmission and set a start PRB offset to 2 RBs.

[0266] When the starting PRB offset is set as described above, the result of calculating the starting PRB offset in conjunction with the interleaving index can cause the Msg.A PUSCH to be transmitted in a frequency band outside the LBT sub-band. The UE does not transmit the Msg.A PUSCH in PRBs in the frequency band outside the LBT sub-band. For example, the Msg.A PUSCH can be dropped in PRBs in the frequency band outside the LBT sub-band. The BS can also expect the UE not to transmit the Msg.A PUSCH in PRBs in the frequency band outside the LBT sub-band.

[0267] As a specific example, when an offset of Y PRBs is indicated to an interleaving index #X consisting of 11 RBs, and the (highest index) last 1 PRB is outside the LBT sub-band, the UE can configure the interleaving with only 10 RBs excluding the last 1 PRB to transmit the PUSCH.

[0268] Option 1-1-3) A set of Msg.A PUSCH resources consisting of specific interleaving indexes can be defined, and the BS can indicate one of the defined set.

[0269] As an example, when a 30kHz SCS is used, there can be a total of 5 interleaving indexes in a 20MHz bandwidth. When the interleaving indexes are #0, #1, #2, #3, and #4, the set of Msg.A PUSCH resources can be defined as shown in Table 15.

[0270] [Table 15]

[0271] Index Interleaving index candidates for a Msg. A PUSCH resource set 0 All interleaving indexes (e.g., #0, #1, #2, #3, #4) 1 Even numbered interleaving indexes (e.g., #0, #2, #4) 2 Odd numbered interleaving indexes (e.g., #1, #3) 3 Reserved

[0272] The BS can select and indicate one of the indexes defined in Table 15 for Msg.A PUSCH transmission. For example, when the BS indicates index 1, the even-numbered interleaving indexes can be set to PO, and thus a 1-PRB gap can be generated between interleaving resources.

[0273] According to Option 1-1-3, a RB-level (e.g., 1-PRB) gap is guaranteed between interleavings on which the Msg.A PUSCH is actually transmitted, and thus reception performance deterioration caused by different TAs does not occur at the BS side. However, when the available interleaving indexes are less than a specific level (e.g., 5 interleavings in 30kHz SCS), providing a RB-level gap can cause a lack of interleaving indexes available as PO, thereby increasing resource overhead.

[0274] In addition, according to Option 1-1-3, it is also possible to transmit a DMRS according to the frequency resource of the PO on which the Msg.A PUSCH is transmitted.

[0275] Proposed Method 1-2: An RE-level frequency gap can be provided between consecutive interleaving indexes.

[0276] Option 1-2-1) Among REs constituting an interleaved PRB corresponding to a specific index, N (N < 12) REs can be excluded from a PO for Msg.A PUSCH transmission.

[0277] As an example, for an interleaved PRB constituting a specific index, Msg.A PUSCH can be transmitted in REs excluding one (lowest or highest) RE (i.e., by rate-matching or dropping or puncturing it). However, since each PRB consists of 11 REs, it can not fit the DFT size. The DFT size can be set to a multiple of 2, 3, or 5.

[0278] As another example, in an interleaved PRB constituting a specific index, Msg.A PUSCH can be transmitted in REs excluding two (lowest and highest, or 2 lowest, or 2 highest) REs (i.e., by rate-matching or dropping or puncturing them). Since each PRB consists of 10 REs, the DFT size is properly configured.

[0279] As another example, the BS can configure information related to an RE-level gap (e.g., the number and / or location of REs in 1 PRB necessary (or unnecessary) for Msg.A PUSCH transmission). The RE-level gap can be differently configured according to the SCS value for Msg.A.

[0280] According to Option 1-2-1, in REs in the same position as REs in which Msg.A PUSCH is configured not to be transmitted, DMRS can be configured not to be transmitted (e.g., DMRS can be punctured or dropped).

[0281] Alternatively, in REs in the same position as REs in which Msg.A PUSCH is configured not to be transmitted, DMRS resources available for transmission can be configured to be excluded from the PO.

[0282] For example, Msg.A PUSCH can be configured to be transmitted without using the highest 1 RE (e.g., by puncturing or dropping it). In the case of DMRS configuration type 1 in Figure 14 In the case of DMRS configuration type 1 in Figure 14 , DMRS resources (corresponding to the highest 1 RE) indicated by the shaded part can be excluded from the PO (i.e., when the RE located at the top is RE#11, DMRS resources consisting of REs #11, #9, #7, #5, #3, and #1 can be excluded). In addition, in the case of DMRS configuration type 2 in Figure 14In the case of DMRS configuration type 2 in the above, it is possible to exclude, from the PO, a DMRS resource (corresponding to the highest 1 RE) indicated by the cross pattern (i.e., when the RE located at the top is RE #11, it is possible to exclude a DMRS resource composed of REs corresponding to #11, #10, #5, and #4).

[0283] Option 1-2-2) can indicate a starting RE offset together with a specific interlace index (where the RE offset can be set to less than 1 PRB (or PRB gap in an interlace)).

[0284] As an example, when 30 kHz SCS is used, there can be a total of 5 interlace indices in a 20 MHz bandwidth. When the interlace indices are #0, #1, #2, #3, and #4, the BS sets the interlace index #0 as a PO for Msg.A PUSCH transmission and sets the starting RE offset to 0. In addition, the BS can set the interlace index #1 as a PO for Msg.A PUSCH transmission and set the starting RE offset to 1 RE. In addition, the BS can set the interlace index #2 as a PO for Msg.A PUSCH transmission and indicate the starting RE offset as 2 REs. The starting RE offset can take the form of {interlace index x RE offset}.

[0285] When the starting RE offset is set as described above, the result of calculating the starting RE offset in conjunction with the interlace index can cause Msg.A PUSCH to be transmitted in a frequency band outside the LBT sub-band. The UE does not transmit Msg.A PUSCH in PRBs in the frequency band outside the LBT sub-band. For example, Msg.A PUSCH can be discarded in PRBs in the frequency band outside the LBT sub-band. The BS can also expect the UE not to transmit Msg.A PUSCH in PRBs in the frequency band outside the LBT sub-band.

[0286] As a specific example, when an offset of Y REs is indicated to interlace index #X composed of 11 RBs, and some REs in the last 1 PRB (highest index) are outside the LBT sub-band, the UE can configure an interlace using only 10 RBs excluding the last 1 PRB to transmit PUSCH.

[0287] In addition, according to Option 1-2-2, it is also possible to transmit DMRS according to the frequency resources of the PO on which Msg.A PUSCH is transmitted.

[0288] According to Option 1-2-2, a RB-level (e.g., 1 RB) gap is guaranteed between interlaces on which Msg.A PUSCH is actually transmitted, so reception performance deterioration due to different TAs does not occur at the BS side.

[0289] Proposed Method 1-3: A new interlacing structure with a gap of frequency intervals can be introduced.

[0290] A new interlacing structure is proposed such that there is always a gap of k REs between consecutive interlace indices (e.g., k = 1).

[0291] The new interlacing structure where there is a gap of k REs can be configured to be used only for Msg.A PUSCH transmission in a 2-step random access procedure.

[0292] The existing Msg.3 PUSCH and other channels (e.g., unicast PUSCH, PUCCH, etc.) are configured to use the interlacing structure defined in the regular system (without a gap of REs).

[0293] For example, the number of PRBs constituting the actual initial UL bandwidth part (BWP) is 48 (based on 30 kHz SCS). However, for the interlacing structure where there is a gap of 1 RE, 44 PRBs can constitute 5 interlaces, and 1 RE gap is configured between consecutive interlace indices.

[0294] In addition, in order to meet the OCB requirement, a middle gap corresponding to 5 REs can be added. 48 PRBs * 12 REs = 576 REs, and 44 PRBs * 13 REs = 572 REs. Thus, 5 REs (the remaining 4 REs and 1 RE existing after the last PRB) can be placed before the 23rd PRB and used as a middle gap.

[0295] Option 1-3-1) assumes that there are a total of 5 interlaces, including 4 interlaces consisting of 9 PRBs and one interlace consisting of 8 PRBs (see Figure 15 ).

[0296] The four interlaces consisting of 9 PRBs meet the OCB requirement as follows: {30(kHz) * 5(interlace interval in PRB) * 13(12 RE + 1 RE gap) * 8(PRB)} + {30(kHz) * 12(RE) * 1(PRB)} + {30(kHz) * 5(middle gap RE)} = 16110(kHz).

[0297] The four interlaces consisting of 8 PRBs fail to meet the OCB requirement: {30(kHz) * 5(interlace interval in PRB) * 13(12 RE + 1 RE gap) * 7(PRB)} + {30(kHz) * 12(RE) * 1(PRB)} + {30(kHz) * 5(middle gap RE)} = 14160(kHz)

[0298] Option 1-3-2) there can be 4 interlaces consisting of 11 PRBs (see Figure 16 ).

[0299] Four interlaces consisting of 11 PRBs satisfy the OCB requirement as follows: {30(kHz)*4(interval between PRBs in interlace)*13(12RE+1RE gap)*10(PRB)}+{30(kHz)*12(RE)*1(PRB)}+{30(kHz)*5(middle gap RE)}=16110(kHz).

[0300] When a new interlace structure with a gap of k REs is introduced through the proposed methods 1-3, a RE-level (e.g., 1 RE) gap is guaranteed between interlaces in which an actual Msg.A PUSCH is transmitted. Thus, reception performance deterioration caused by different TAs does not occur at the BS side. In addition, since no additional signaling from the BS is required, signaling overhead can also be reduced.

[0301] According to the proposed methods 1-3, a DMRS can also be transmitted according to the frequency resource of a PO in which a Msg.A PUSCH is transmitted.

[0302] Proposed method 1-4: A UE can transmit a Msg.A PUSCH by puncturing or rate-matching a specific interlace index belonging to a PO resource indicated by a BS.

[0303] In the case where a BS configures interlace indexes for each PO and adjacent POs are configured continuously without a frequency gap therebetween, when a guard band (e.g., with a 1-RB size) is configured between adjacent POs, an actual Msg.A PUSCH can be transmitted in interlaces corresponding to remaining interlace indexes other than a specific (e.g., one) interlace index within a configured PO. When no (non-zero) guard band is configured between adjacent POs, then an actual Msg.A PUSCH can be transmitted in interlaces corresponding to all interlace indexes in a PO configured by a BS.

[0304] As an example, when a BS allocates N (e.g., N=2) (or more) interlace indexes for each PO, an actual Msg.A PUSCH can be transmitted using interlaces other than the highest (or lowest) interlace index among the N interlaces. All PRBs constituting the highest (or lowest) interlace index can be punctured or rate-matched in a Msg.A PUSCH transmission.

[0305] As another example, when a BS allocates N (e.g., N=2) (or more) interlace indexes for each PO, an actual Msg.A PUSCH can be transmitted using interlaces other than an interlace in which the first or last PRB is at the highest (or lowest) frequency. All PRBs constituting an interlace index in which the first or last PRB is positioned at the highest (or lowest) frequency can be punctured or rate-matched in a Msg.A PUSCH transmission.

[0306] As another example, when the BS allocates N (e.g., N = 2) (or more) interlaces per PO, the actual Msg.A PUSCH can be transmitted using interlaces other than the interlace configured as the last (e.g., highest) resource index (or the first (e.g., lowest) resource index) in the RRC configuration (for PO resource configuration). All PRBs constituting the interlace configured as the last (i.e., highest) (or the first (i.e., lowest)) resource index in the RRC configuration can be punctured or rate-matched in the Msg.A PUSCH transmission.

[0307] Proposed Method 1-5: The UE can transmit the Msg.A PUSCH with interlace gaps placed between multiple PO resources indicated by the BS.

[0308] In the case where the BS configures POs adjacent to each other, when a guard band (e.g., with 1 RB size) is configured between the adjacent POs, the POs for actual Msg.A PUSCH transmission can be reconfigured by inserting X (e.g., X = 1) interlaces (or sets of non-contiguous or equally spaced PRBs corresponding thereto) as gaps between the adjacent POs. When no (non-zero) guard band is configured, the actual Msg.A PUSCH can be transmitted using the interlaces in the originally configured POs.

[0309] As an example, when the BS configures N POs adjacent to each other, the POs for actual Msg.A PUSCH transmission can be configured with interlace gaps (e.g., corresponding to one interlace) placed between the adjacent POs. Specifically, the interlace index set by the BS to the PO at the lowest frequency location can be assigned to the PO, and the PO at the second lowest location is assigned an interlace index one interlace gap away from the lowest PO. In other words, the assignment is obtained by applying an offset corresponding to one interlace gap to the interlace index set by the BS for the PO. For example, for the PO at the second lowest location, "+1" can be applied to the interlace index assigned by the BS. For the Kth PO, the BS can apply an offset corresponding to K-1 interlace indices to the interlace index set by the BS for the PO. For example, for the Kth PO, "+K-1" can be applied to the interlace index set by the BS to the PO.

[0310] Assuming that there is one interlace gap between N POs, a total of N+N-1 interlaces are required to actually configure the N POs.

[0311] In the case where a particular PO is allocated to an unavailable frequency band or intrudes on other UL resources, the PO can be set to be invalid.

[0312] 3.2 Embodiment 2: RO and PO in the case of same (or consecutive) slots

[0313] When RO and PO for 2-step RACH are continuously scheduled, a UE can share channel occupancy (CO) by performing an LBT procedure only once. Accordingly, in Embodiment 2, a method for continuously scheduling RO and PO can be proposed.

[0314] Proposed method 2-1: A BS can configure the last X OFDM symbols in slot N (i.e., OFDM symbols #14-X,..., #12, and #13 in slot N) as RO and the first Y OFDM symbols in slot N+1 (i.e., OFDM symbols #0, #1,..., and #Y-1 in slot N+1) as PO (assuming that RO and PO are linked to each other).

[0315] After transmitting a Msg.A preamble on the configured RO, a UE can operate under Cat-1 LBT (no LBT) by sharing CO, because the gap between RO and PO is 0, and then transmit a Msg.A PUSCH on the PO.

[0316] Proposed method 2-1-1: In addition to proposed method 2-1, a BS can configure the remaining OFDM symbols of slot N as RO for 4-step RACH. In this case, an LBT gap can be required between ROs.

[0317] Specifically, when n ROs are configured in slot N, only the last RO can be used as RO for 2-step RACH, and the remaining ROs can be used as RO for 4-step RACH. Because the last RO is in contact with a PO in the next slot N+1, it can be used for 2-step RACH. On the other hand, the remaining ROs can be used as RO for 4-step RACH because they are not in contact with a PO.

[0318] Proposed method 2-2: When RO and PO (of the same Msg.A) are configured in a RACH slot without a gap therebetween, the last RO in slot N and the first PO in slot N+1 can be connected without a gap

[0319] The last RO can be shifted to the boundary of slot N, or the end position of the last RO can be extended to the boundary of slot N, where the start position of the last RO is fixed.

[0320] The connection between the last RO and the first PO can be established only when the gap therebetween is less than or equal to a certain level. When the gap is greater than or equal to a certain value, a Msg.A can be configured while the last RO and the first PO are not connected and the gap therebetween is maintained.

[0321] Proposed Method 2-3: The BS can configure multiple ROs and POs (without a gap between the RO and the PO) that are continuously present in a specific slot

[0322] After transmitting the Msg.A preamble on the RO, the UE can operate under Cat-1 LBT (no LBT) through the shared CO, since the gap between the RO and the PO is 0, and then transmit the Msg.A PUSCH on the PO.

[0323] Specifically, to configure the structure as in the proposed Method 2-3, the ROs and the POs can be continuously configured, respectively, and then information indicating valid (or invalid) occasions for each of the ROs and the POs can be additionally transmitted.

[0324] For example, 6 ROs each consisting of 2 OFDM symbols can be configured in a slot N (assuming that a start offset of 2 symbols is indicated and the ROs are positioned from the third OFDM symbol), and 6 POs each consisting of 2 OFDM symbols can be configured in the slot N (similarly assuming that a start offset of 2 symbols is indicated and the POs are positioned from the third OFDM symbol). Thereafter, the BS can transmit information indicating that only even-numbered ROs are valid while odd-numbered ROs are invalid, and information indicating that only odd-numbered POs are valid while even-numbered POs are invalid. This information can be transmitted using a method such as a bitmap or a 1-bit even / odd selection. In the slot N, three occasions of the ROs and the POs can occur from the third OFDM symbol without a gap. Even in this case, an LBT gap can be required between the three occasions of the ROs and the POs.

[0325] Proposed Method 2-4: The UE can transmit a Msg.A preamble immediately after LBT succeeds (or at a specific location existing after the time of LBT success), and then transmit a Msg.A PUSCH immediately thereafter.

[0326] For example, the BS configures ROs and POs in multiple (half-)slot units. After performing an LBT procedure within the configured (half-)slot, the UE can transmit a preamble on the RO by applying a format and repetition corresponding to a PRACH configuration index set immediately after the time of LBT success or set according to a symbol boundary (or (half-)slot boundary) existing immediately after the time of LBT success. Subsequently, a Msg.A PUSCH can be transmitted on the PO.

[0327] In another example, the BS can configure ROs to overlap each other in the time domain, and transmit a Msg.A preamble starting from the RO closest to the LBT start time. Thereafter, a Msg.A PUSCH can be transmitted immediately.

[0328] For example, the BS can configure a 6-symbol RO including RO#1 starting from symbol #0, RO#2 starting from symbol #1, RO#3 starting from symbol #2, and so on. When the UE succeeds in Cat-4 LBT immediately before RO#3, it can transmit a Msg.A preamble on RO#3 and immediately thereafter transmit a Msg.A PUSCH.

[0329] According to the proposed methods 2-4, the transmission occasion for the Msg.A preamble and PUSCH can increase from the UE's perspective, but the number of BDs can increase, which is a burden to the BS.

[0330] Specifically, when the frequency band of the RO constituting the same Msg.A is set to be smaller or different from that of the PO, the RO and the PO can be configured with a time gap placed therebetween (in different slots). Or, when the frequency band of the RO is smaller or different from that of the PO and there is no time gap between the RO and the PO, only a portion aligned with the frequency band of the RO can be determined as a PO resource. When the frequency band of the RO is set to be greater than or equal to that of the PO, the RO and the PO can be configured with or without a time gap therebetween.

[0331] 3.3 Embodiment 3: Resource allocation type for Msg.3 PUSCH (or Msg.A PUSCH)

[0332] When transmitting the Msg.3 PUSCH (or Msg.A PUSCH) in the RACH procedure, the UE needs to know whether to use the method of PRB-level resource allocation or the method of interlace-level resource allocation.

[0333] As the most basic method, a default RA type for the Msg.3 PUSCH (or Msg.A PUSCH) can be determined. In addition, the BS can configure the RA type through higher layer signaling (e.g., SIB or RMSI, etc.), thereby directly indicating the RA type (in addition to the default RA type) to the UE. That is, when there is no RA type for the Msg.3 PUSCH (or Msg.A PUSCH) directly configured by the BS, the BS and the UE can transmit and receive the Msg.3 PUSCH (or Msg.A PUSCH) based on the default RA type.

[0334] Alternatively, the RA type for Msg. 3 PUSCH (or Msg. A PUSCH) can be directly indicated through Msg. 2 RAR (or Msg. B RAR). To this end, the RA type for Msg. 3 PUSCH (or Msg. A PUSCH) can be determined. When there is no RA type directly configured through Msg. 2 RAR (or Msg. B RAR), the BS and the UE can transmit and receive Msg. 3 PUSCH (or Msg. A PUSCH) based on a default RA type.

[0335] 3.4 Embodiment 4: CP extension for Msg. A PRACH and Msg. A PUSCH

[0336] In the case where the RO is positioned after the RACH slot in which the Msg. A preamble is transmitted and the PO is positioned before the PUSCH slot in which the Msg. A PUSCH is transmitted, while the RO and the PO (through the same Msg. A configuration) are associated with each other, the UE can extend the CP of the Msg. A PUSCH and use the RO and the PO through only one LBT procedure, with no gap therebetween. In other words, the UE can perform an operation of channel occupancy (CO) sharing by extending the CP of the Msg. A PUSCH to eliminate the gap between the RO and the PO.

[0337] In this case, the size of the gap between the RO and the PO in which the CP extension can be allowed and the case and condition in which the CP extension of the Msg. A PUSCH is allowed can be defined.

[0338] 4-1) Size of the gap between the RO (or PRACH signal) and the PO (or PUSCH signal) in which the CP extension is allowed

[0339] The CP extension can be an operation of extending the PRACH signal to the PUSCH start symbol to fill the gap between the RO and the PO with the PRACH signal or extending the CP of the PUSCH start symbol to the last symbol of the PRACH to fill the gap between the RO and the PO with the CP.

[0340] Option 4-1-1) is set to a gap size of less than or equal to 1 symbol (or 1 symbol for 15 kHz SCS, 2 symbols for 30 kHz SCS, or 4 symbols for 60 kHz SCS), which is the maximum gap allowing the CP extension defined in NR-U.

[0341] Option 4-1-2) Set to a gap size of less than or equal to 2 symbols (for 15 / 30 kHz SCS) or 4 symbols (for 60 kHz SCS), which is the minimum gap defined for NR 2-step RACH between RO (or PRACH signal) and PO (or PUSCH signal)

[0342] Option 4-1-3) BS can indicate by SIB the maximum size of the gap in which CP extension is allowed.

[0343] 4-2) Conditions for allowing CP extension between RO (or PRACH signal) and PO (or PUSCH signal)

[0344] Option 4-2-1) CP extension can be allowed when the gap between RO (PRACH) and PO (PUSCH) associated with it (configured by the same Msg.A) satisfies the gap size of 4-1) above. Alternatively, BS can indicate / set by SIB whether CP extension is allowed or not.

[0345] Option 4-2-2) CP extension can not be allowed when the gap between RO (PRACH) and PO (PUSCH) associated with it (configured by the same Msg.A) satisfies the gap size of 4-1) above while the PO is not associated with other ROs configured on a different symbol from the symbol of the associated RO, i.e., when one PO is associated with ROs satisfying the gap size and also with ROs not satisfying the gap size. As an example, UE1 that has selected RO not satisfying the gap size can intend to transmit Msg.A PUSCH on the PO associated with the selected RO, and UE2 that has selected RO satisfying the gap size can also intend to transmit Msg.A PUSCH on the selected RO. In this case, the POs associated with the two ROs can be the same. UE1 can perform LBT again before the PO, but UE2 can perform CP extension. Thus, UE1 can always fail LBT and fail to transmit Msg.A PUSCH on the PO. Therefore, when one PO is associated with both ROs satisfying the gap size and ROs not satisfying the gap size, CP extension can not be allowed. Alternatively, BS can indicate / set by SIB whether CP extension is allowed or not.

[0346] Option 4-2-3) BS can indicate / set by SIB which one of Option 4-2-1 and Option 4-2-2 is to be applied as a condition for allowing CP extension and / or whether CP extension is allowed or not.

[0347] In addition, depending on whether the UE supports CP extension, a CP extension operation can not be performed. That is, even when the BS indicates / sets the CP extension operation through the SIB1, the UE can not follow the content related to the CP extension indicated by the BS unless the UE capability supports the CP extension operation. When the UE does not support the CP extension, the 2-step RACH can be replaced with the 4-step RACH.

[0348] 3.5 Embodiment 5: Frequency offset for FDMed ROs in NR-U

[0349] When the PRACH uses a 30 kHz SCS, a Zadoff-Chu (ZC) sequence of length 571 can be used as a PRACH preamble sequence. When the PRACH uses a 15 kHz SCS, a ZC sequence of length 1151 can be used as a PRACH preamble sequence. In addition, FDM of ROs can be configured in NR-U. According to the legacy system, the number of FDMed ROs is indicated by the parameter msg1-FDM (= 1, 2, 4, 8), and the starting frequency location of the RO positioned at the lowest frequency among the FDMed ROs is indicated by the parameter msg1-FrequencyStart (PRB level offset).

[0350] However, the UL active BWP can be indicated to include one or more RB sets. The UL active BWP including multiple RB sets can include intra-cell guard PRBs. When multiple ROs are configured by FDM, the intra-cell guard PRBs in the UL active BWP can be positioned in the middle of the ROs, which is not suitable for the transmission of the PRACH sequence.

[0351] Therefore, multiple FDMed ROs can be configured to exist one in each UL RB set, and the following solutions are proposed.

[0352] [Proposed Method 5-1]: The starting frequency location of multiple FDMed ROs can be configured to start based on the lowest PRB of each UL RB set.

[0353] Option 5-1-1) In addition to the above-described Method 1, the starting frequency location of each RO can be commonly indicated using an existing parameter (i.e., msg1-FrequencyStart). For example, the starting frequency location of each RO can be set to a location obtained by adding the value of a single offset parameter to the lowest PRB in each UL RB set. The single offset parameter can be msg1-FrequencyStart. The single offset parameter can be commonly applied to all UL RB sets.

[0354] Option 5-1-2) In addition to Method 1 above, a separate parameter can be added for each RO to independently indicate the starting frequency location of each RO. For example, the starting frequency location of each RO can be set to the location obtained by adding the value of the separately / independently set offset parameter (for each UL RB set) to the lowest PRB in each UL RB set. The separately / independently set offset parameter can be msg1-FrequencyStart. The frequency offset can be in units of PRB or RE (subcarrier).

[0355] Option 5-1-3) A parameter S (i.e., msg1-FrequencyStart) for the starting location of the RO at the lowest frequency in the UL active BWP for positioning and a parameter N for the number of ROs FDMed in the frequency domain can be configured by higher layer signaling (e.g., SIB, RRC). The gap between the starting PRB index of the RO at the lowest frequency (corresponding to the value of parameter S) and the lowest PRB index in the UL RB set including the RO at the lowest frequency is defined as the RO offset (e.g., RO offset = R). The set index of the UL RB set including the RO at the lowest frequency can be A. The remaining N-1 ROs are allocated to the N-1 UL RB sets consecutively in frequency after the UL RB set A including the RO at the lowest frequency, respectively. For the N-1 ROs allocated to the N-1 UL RB sets, the RO offset value R is equally applied as the gap between the lowest PRB index in each UL RB set and the starting PRB index of the RO included in each UL RB set.

[0356] When a specific PRACH preamble sequence (e.g., with a short length) is configured and multiple ROs are allocatable within the UL RB set consecutively in frequency, the RO offset R is equally applied to the RO at the lowest frequency in each UL RB set set by Option 5-1-3. Multiple ROs are allocated consecutively in the frequency domain from the RO at the lowest frequency in each UL RB set. The maximum number of multiple ROs can be set to the maximum number of ROs that can be completely included in the UL RB set while being consecutive from the RO at the lowest frequency in each UL RB set. After allocating ROs consecutively in the frequency domain in each UL RB set starting from the UL RB set A including the RO at the lowest frequency, ROs can be allocated to each of the UL RB sets consecutively in the frequency domain.

[0357] Option 5-1-4) The parameters S (i.e., msg1-FrequencyStart) for the starting position of the RO at the lowest frequency in the UL active BWP for positioning and N for the number of ROs being FDMed in the frequency domain can be configured by higher layer signaling (e.g., SIB, RRC). The gap between the starting PRB index of the RO at the lowest frequency (corresponding to the value of parameter S) and the lowest PRB index in the UL RB set including the RO at the lowest frequency is defined as the RO offset. The set index of the UL RB set including the RO at the lowest frequency can be A. The RO offset is applied only to the RO at the lowest frequency. The remaining N-1 ROs are allocated to the N-1 UL RB sets consecutively in frequency after the UL RB set A including the RO at the lowest frequency, respectively. For the N-1 ROs allocated to the N-1 UL RB sets, the lowest PRB index in each UL RB set is set to the starting PRB index of the RO included in the UL RB set (i.e., RO offset = 0).

[0358] When a specific PRACH preamble sequence (e.g., with a short length) is configured and multiple ROs are allocatable consecutively in frequency within the UL RB set, the RO offset R or 0 is applied to the RO at the lowest frequency in each UL RB set set by Option 5-1-4. Multiple ROs are allocated consecutively in the frequency domain from the RO at the lowest frequency in each UL RB set. The maximum number of multiple ROs can be set to the maximum number of ROs that can be completely included in the UL RB set while being consecutive to the RO at the lowest frequency in each UL RB set. After allocating ROs consecutively in the frequency domain in each UL RB set starting from the UL RB set A including the RO at the lowest frequency, ROs can be allocated to each of the UL RB sets consecutively in the frequency domain.

[0359] The RB set assumed by the UE in the proposed method 5-1 can be the RB set based on the nominal guard band defined in the RAN4 specification, not the RB set based on the guard band configured by RRC. Based on the RB set configuration, the PRACH mapping method in the proposed method 5-1 can be performed / applied.

[0360] [Proposed method 5-2]: A parameter indicating the gap between multiple FDMed ROs can be added.

[0361] The starting frequency position of the RO located at the lowest frequency among multiple ROs undergoing FDM can be indicated using an existing parameter (i.e., msg1-FrequencyStart). The starting frequency position of the next RO is determined by using the added parameter to separate it from the highest frequency position occupied by the immediately preceding RO by a specific frequency offset. The frequency offset can be in units of PRB or RE (subcarrier).

[0362] In proposed method 5-2, the RB set assumed by the UE can be based on the RB set of the nominal guard band defined in the RAN4 specification, rather than the RB set of the guard band configured via RRC. Based on this RB set configuration, the PRACH mapping method in proposed method 5-1 can be executed / applied.

[0363] Proposed methods 5-1 and 5-2 can be applied regardless of whether an intra-cell protection PBR is present in the UL active BWP. Furthermore, proposed methods 5-1 and 5-2 can be applied only when the intra-cell protection PBR is present in the UL active BWP. Proposed methods 5-1 and 5-2 can be configured to apply only when the intra-cell protection PBR is present in the active BWP. In this case, when the intra-cell protection PBR is not present in the UL active BWP, the configuration of the conventional system can be applied.

[0364] 3.6 Example 6: Guard band for PUSCH transmission in RACH process

[0365] When a PUSCH is sent during the RACH process (i.e., Msg.3PUSCH (or Msg.A PUSCH)), the number and location of the PRBs in which the PUSCH is sent can vary between UEs depending on whether the UE has already obtained the guard band configuration information.

[0366] As an example, an idle-mode UE that fails to obtain guard band configuration information can identify that a PRB based on the nominal guard band information is a guard band and determine the range of RB sets. A connected-mode UE that has obtained guard band configuration information can determine the range of RB sets by checking the guard band configuration information obtained from the BS. In this case, the range of RB sets configured by the two UEs can be different from each other depending on the guard band information configured by the BS. Therefore, Msg.3PUSCH (or Msg.APUSCH) can be transmitted on UL resources consisting of different numbers of PRBs for each UE (e.g., interleaved PRBs). Therefore, the BS may need to address the blind decoding (BD) problem in both cases.

[0367] Accordingly, the UE and the BS can be configured such that, when transmitting the Msg.3 PUSCH (or Msg.A PUSCH), it is determined that the RB set is configured according to the nominal guard band information. Transmitting the Msg.3 PUSCH (or Msg.A PUSCH) corresponds to the case where the PUSCH indicated by the RAR grant, the PUSCH scheduled by the DCI 0_0 scrambled by the TC-RNTI, or the Msg.A PUSCH is transmitted and then the Msg.A PUSCH is transmitted on the PO associated with the corresponding RO. The UE and the BS can operate to transmit and receive the Msg.3 PUSCH (or Msg.A PUSCH) using only the PRB resources in the corresponding RB set based on the RB set in which the nominal guard band is configured. When they are configured in this way, the BS can not need to perform BD when receiving the Msg.3 PUSCH (or Msg.A PUSCH).

[0368] In particular, the proposed method described above can be applied to contention-based random access (CBRA). In other words, since the RACH procedure is performed based on contention between a plurality of UEs, the Msg.3 PUSCH (or Msg.A PUSCH) is also transmitted from a plurality of UEs in an overlapping manner. Accordingly, in order not to increase the BD complexity of the BS, the Msg.3 PUSCH (or Msg.A PUSCH) can be configured to be transmitted on UL resources consisting of the same number of PRBs (e.g., interleaved PRBs).

[0369] In a case in which the BS has issued an operation command in contention-free random access (CFRA) through a PDCCH order, the BS can individually designate a random access preamble ID (RAPID) for CFRA to a specific UE operating in a connected mode. At this time, the BS has recognized that only the specific UE to which the BS has issued a command will transmit a (Msg.3) PUSCH indicated by a RAR grant corresponding to the RAPID (or a Msg.A PUSCH associated with a Msg.A PRACH corresponding to the RAPID). Accordingly, the BS can determine that the specific UE has known the guard band and RB set configuration information through the guard band configuration information indicated by the BS. Accordingly, the BS does not need to configure the RB set for the specific UE unnecessarily according to the nominal guard band information. Accordingly, the UE instructed to perform CFRA (through a PDCCH order) can transmit a (Msg.3) PUSCH indicated by a RAR grant corresponding to the RAPID indicated by the BS (or a Msg.A PUSCH associated with a Msg.A PRACH corresponding to the RAPID indicated by the BS) and determine to configure the RB set according to the guard band configuration information indicated by the BS. Accordingly, the UE and the BS can operate to transmit and receive the Msg.3 PUSCH (or the Msg.A PUSCH) using only the PRB resources in the corresponding RB set based on the RB set in which the guard band is configured.

[0370] In addition, a similar problem to the above-described problem can occur with respect to the PRACH (Msg.1 preamble or Msg.A PRACH). That is, with respect to Embodiment 5 in which it is proposed that when a plurality of ROs are allocated in a frequency domain and a specific RO occupies a plurality of RB sets, the UE and the BS need to accurately identify the start PRB index of the next RB set with respect to the method in which the operation should proceed to the next RB set. The idle mode UE that has failed to receive the UE-specific guard band configuration checks the RB set configuration according to the nominal guard band, while the connected mode UE that can receive the UE-specific guard band configuration checks the RB set configuration as indicated by the BS. If the RB set configurations understood by the two UEs are different from each other, the location of the actual RO can also be different between the UEs, thereby causing a problem in terms of reception by the BS.

[0371] Accordingly, when transmitting Msg. 1 PRACH (or Msg. A PRACH), the UE and the BS can be configured to always determine that the RB set is configured according to the nominal guard band information. Accordingly, the UE and the BS can operate to transmit and receive Msg. 1 PRACH (or Msg. A PRACH) using only the PRB resources in the corresponding RB set based on the RB set in which the nominal guard band is configured. Alternatively, when configuring / indicating the RO for transmitting Msg. 1 PRACH (or Msg. A PRACH), the BS can configure the RO always assuming that the RB set is configured according to the nominal guard band information. With the configuration established in this way, BD is not required when the BS receives Msg. 1 PRACH (or Msg. A PRACH).

[0372] In addition, the proposed method described above can be equally applied to the transmission of PUCCH (i.e., initial PUCCH resource set) through which the HARQ ACK of Msg. 4 or Msg. B is transmitted. In other words, when the PUCCH for transmitting the HARQ ACK PUCCH of Msg. 4 or the HARQ ACK PUCCH of Msg. B is transmitted (i.e., when the initial PUCCH resource set is used before the dedicated PUCCH resource set is indicated), the UE and the BS can be configured to always determine that the RB set is configured according to the nominal guard band information. Accordingly, the UE and the BS can operate to transmit and receive the HARQ ACK PUCCH of Msg. 4 or the HARQ ACK PUCCH of Msg. B using only the PRB resources in the corresponding RB set based on the RB set in which the nominal guard band is configured. Further, with the above method, BD is not required when the BS receives the HARQ ACK PUCCH of Msg. 4 or the HARQ ACK PUCCH of Msg. B.

[0373] 3.7 Embodiment 7: PO allocation for 2-step RACH procedure in NR-U

[0374] When the 2-step RACH procedure is used in NR-U, the BS can configure the PUSCH occasion (PO) using UL resource allocation type 2 (interlace structure). The BS can configure / indicate multiple FDMed POs using the following methods.

[0375] [Proposed method 7-1] When multiple interlace indices and multiple RB sets are configured, PO indexing can be performed.

[0376] It is assumed that the BWP consists of K RB sets, and a total of L (units) of interlaces are configured in each RB set (where K and L are natural numbers).

[0377] The UE and the BS index the total of {K x L} (unit) interlaces in the lowest (or highest) index order with RB interlace index first & RB set index second (where m = 0, 1, …, K x L - 1).

[0378] As an example, the UE and the BS index {interlace index 0 in RB set index 0} as (unit) interlace index 0, {interlace index 1 in RB set index 0} as (unit) interlace index 1, …, {interlace index L - 1 in RB set index 0} as (unit) interlace index L - 1, {interlace index 0 in RB set index 1} as (unit) interlace index L, {interlace index 1 in RB set index 1} as (unit) interlace index L + 1, …, and {interlace index L - 1 in RB set index K - 1} as (unit) interlace index K x L - 1.

[0379] For a BWP, three parameters, i.e., a starting (unit) interlace index (or offset) “A”, a number of (unit) interlaces per PO “B”, and a number of POs which are FDMed “C”, can be configured for the UE by SIB or RRC.

[0380] Thus, B adjacent (unit) interlaces (on (unit) interlace index m) starting from (unit) interlace index m = A can be bundled to form each PO resource. Thereby, a total of C POs (adjacent on (unit) interlace index m) can be configured.

[0381] For example, m = A to A + B - 1 can be assigned to a first PO (PO index 0), m = A + B to A + 2B - 1 can be assigned to a second PO (PO index 1), …, and m = A + (C - 1)xB to A + CxB - 1 can be assigned to a last Cth PO (PO index C - 1).

[0382] According to the above confirmation, POs can be configured using all (unit) interlace indices for each single RB set length. Thus, the number of occasions for transmitting Msg.A PUSCH can be increased, and thus the BS can be easily configured in RO to PO mapping.

[0383] In addition, a gap between the lowest (unit) interlace index in the RB set (e.g., a first RB set in which a PO resource is configured) to which the starting (unit) interlace index (or offset) “A” belongs and the starting (unit) interlace index (or offset) “A” can be determined as an interlace index offset. In addition, the interlace index offset can even be applied to other RB sets (after the first RB set (index)) for the (first) PO resource configured in the RB set.

[0384] For example, when there are a total of 5 (unit) interlace indices in the RB set, A is set to (unit) interlace index 6, and B is set to 2 (unit) interlaces, {interlace indices 1 / 2 in RB set index 1} is set to PO index 0 (in this case, interlace index offset = 1, and thus the offset is equally applied to the RB set after RB set index 1), {interlace indices 3 / 4 in RB set index 1} is set to PO index 1, {interlace indices 1 / 2 in RB set index 2} is set to PO index 2, and so on.

[0385] [Proposed method 7-2] A single RO can additionally be configured to always be included in a single RB set based on proposed method 7-1.

[0386] As in proposed method 7-1, it is assumed that a BWP is composed of K RB sets, and a total of L (unit) interlaces are configured in each RB set (where K and L are natural numbers).

[0387] In this case, the UE and the BS index a total of {K x L} (unit) interlace resources in the order of the lowest (or highest) index in the manner of RB interlace index first & RB set index second (where m = 0, 1,..., K x L - 1).

[0388] As an example, the UE and the BS index {interlace index 0 in RB set index 0} as (unit) interlace index 0, {interlace index 1 in RB set index 0} as (unit) interlace index 1,..., {interlace index L - 1 in RB set index 0} as (unit) interlace index L - 1, {interlace index 0 in RB set index 1} as (unit) interlace index L, {interlace index 1 in RB set index 1} as (unit) interlace index L + 1,..., and {interlace index L - 1 in RB set index K - 1} as (unit) interlace index K x L - 1.

[0389] In addition, for a BWP, three parameters, i.e., a starting (unit) interlace index (or offset) "A", a number of (unit) interlaces per PO "B", and a number of POs that are FDMed "C", can be configured for a UE through a SIB or RRC.

[0390] Thus, B adjacent (unit) interlaces (on (unit) interlace index m) starting from (unit) interlace index m = A can be bundled to form each PO resource. Thereby, a total of C POs (adjacent on (unit) interlace index m) can be configured.

[0391] For example, m = A to A+B-1 can be set to the first PO (PO index 0), m = A+B to A+2B-1 can be set to the second PO (PO index 1),..., and m = A+(C-1)xB to A+CxB-1 can be set to the last Cth PO (PO index C-1).

[0392] In addition, when one PO is composed of B adjacent (unit) interleaves on the (unit) interleave index m, if the corresponding PO resource spans multiple RB sets (e.g., two RB sets having indexes k and k+1), the PO can be composed of B adjacent (unit) interleaves starting from the first (unit) interleave index of the RB set having the highest frequency or index among the multiple RB sets (RB set index k+1 in the case of the foregoing example).

[0393] For example, in the configuration of the proposed method 7-1, when there are a total of 5 (unit) interleave indexes in the RB set, A is set to the (unit) interleave index 0, and B is set to 2 (unit) interleaves, {interleave indexes 0 / 1 in the RB set index 0} can be set to the PO index 0, {interleave indexes 2 / 3 in the RB set index 0} can be set to the PO index 1, {interleave index 4 in the RB set index 0 & interleave index 0 in the RB set index 1} can be set to the PO index 2, and so on.

[0394] For example, in the configuration of the proposed method 7-2, when there are a total of 5 (unit) interleave indexes in the RB set, A is set to the (unit) interleave index 0, and B is set to 2 (unit) interleaves, {interleave indexes 0 / 1 in the RB set index 0} can be set to the PO index 0, {interleave indexes 2 / 3 in the RB set index 0} can be set to the PO index 1, {interleave indexes 0 / 1 in the RB set index 1} can be set to the PO index 2, and so on.

[0395] When the configuration is established as described above, all POs can be limited in one RB set, and thus the probability that the UE will be successful in LBT can be increased.

[0396] In addition, the gap between the lowest (unit) interleave index in the RB set to which the starting (unit) interleave index (or offset) "A" configured by the BS belongs (e.g., the first RB set in which the PO resource is configured) and the starting (unit) interleave index (or offset) "A" can be determined as an interleave index offset. In addition, the interleave index offset can even be applied to other RB sets (after the first RB set (index)) for the (first) PO resource configured in the RB set.

[0397] For example, when there are a total of 5 (unit) interlace indexes in the RB set, A is set to (unit) interlace index 7, and B is set to 2 (unit) interlaces, {interlace indexes 2 / 3 in the RB set index 1} can be set to PO index 0 (in this case, interlace index offset = 2, and thus the offset is equally applied to the RB set after the RB set index 1), {interlace indexes 2 / 3 in the RB set index 2} can be set to PO index 1, {interlace indexes 2 / 3 in the RB set index 3} can be set to PO index 2, and so on.

[0398] Discontinuous reception (DRX) operation

[0399] A UE can perform a DRX operation while performing the aforementioned / proposed procedures and / or methods. A UE configured with DRX can reduce power consumption by discontinuously receiving a DL signal. DRX can be performed in an RRC_IDLE state, an RRC_INACTIVE state, and an RRC_CONNECTED state. DRX is used for discontinuous reception of a paging signal in the RRC_IDLE state and the RRC_INACTIVE state. Now, DRX performed in the RRC_CONNECTED state (RRC_CONNECTED DRX) will be described below.

[0400] Figure 17 FIG. is a diagram illustrating a DRX cycle (RRC_CONNECTED state).

[0401] Reference Figure 17, a DRX cycle includes an On Duration and an Opportunity for DRX. The DRX cycle defines a time interval in which the On Duration is repeated periodically. The On Duration is a time period in which the UE monitors to receive PDCCH. When DRX is configured, the UE performs PDCCH monitoring during the On Duration. When there is any successfully detected PDCCH during PDCCH monitoring, the UE operates an inactivity timer and remains in a wake-up state. On the other hand, when there is no successfully detected PDCCH during PDCCH monitoring, the UE enters a sleep state at the end of the On Duration. Thus, if DRX is configured, PDCCH monitoring / reception can be discontinuously performed in time domain when the aforementioned / proposed procedures and / or methods are performed. For example, if DRX is configured, PDCCH reception occasions (e.g., slots with PDCCH search space) can be discontinuously configured according to the DRX configuration in the present disclosure. In contrast, if DRX is not configured, PDCCH monitoring / reception can be continuously performed in time domain when the aforementioned / proposed procedures and / or methods are performed. For example, if DRX is not configured, PDCCH reception occasions (e.g., slots with PDCCH search space) can be continuously configured in the present disclosure. PDCCH monitoring can be limited within a time period configured as a measurement gap, regardless of whether DRX is configured or not.

[0402] Table 16 describes UE operation related to DRX (in RRC_CONNECTED state). Referring to Table 16, DRX configuration information is received through higher layer (RRC) signaling, and DRX On / Off is controlled by a DRX command of the MAC layer. Once DRX is configured, the UE can discontinuously perform PDCCH monitoring when performing the procedures and / or methods described / proposed according to the present disclosure, as illustrated in FIG. Figure 17 .

[0403] [Table 16]

[0404]

[0405] MAC-CellGroupConfig includes configuration information required to configure MAC parameters for a cell group. The MAC-CellGroupConfig can also include DRX configuration information. For example, the MAC-CellGroupConfig can include the following information when defining DRX.

[0406] - Value of drx-OnDurationTimer: defines the length of the start duration of the DRX cycle.

[0407] - Value of drx-InactivityTimer: defines the length of the duration in which the UE is in an awake state after a PDCCH occasion in which a PDCCH indicating initial UL or DL data has been detected.

[0408] - Value of drx-HARQ-RTT-TimerDL: defines the length of the maximum duration from receiving a DL initial transmission to receiving a DL retransmission.

[0409] - Value of drx-HARQ-RTT-TimerDL: defines the length of the maximum duration from receiving a grant for a DL initial transmission to receiving a grant for an UL retransmission.

[0410] - drx-LongCycleStartOffset: defines the duration and start time of a DRX cycle.

[0411] - drx-ShortCycle (optional): defines the duration of a short DRX cycle.

[0412] When at least one of the drx-OnDurationTimer, drx-InactivityTimer, drx-HARQ-RTT-TimerDL, or drx-HARQ-RTT-TimerDL is running, the UE performs PDCCH monitoring at each PDCCH occasion while remaining in an awake state.

[0413] After the operations described in various embodiments of the disclosure, the UE can perform such DRX-related operations. After performing a RACH procedure according to embodiments of the disclosure, the UE can monitor a PDCCH for an on duration. When a PDCCH is successfully detected during PDCCH monitoring, the UE can operate an inactivity timer (drx-InactivityTimer) and remain awake.

[0414] Embodiment example

[0415] Figure 18 is a flowchart illustrating a signal transmission / reception method according to an embodiment of the disclosure.

[0416] Referring to Figure 18 , embodiments of the disclosure can be performed by a UE and can include performing a RACH procedure (S1801), monitoring a PDCCH for an on duration based on a configured DRX operation after performing the RACH procedure (S1803), and starting an inactivity timer and remaining awake based on a PDCCH successfully received for the on duration (S1805).

[0417] The RACH procedure includes a 4-step RACH procedure and a 2-step RACH procedure.

[0418] During the RACH procedure, the PRACH can be transmitted on a specific RACH occasion (RO) among a plurality of ROs. In addition, the PRACH can be transmitted on some specific ROs among a plurality of ROs.

[0419] The plurality of ROs can be configured by a combination of one or more of the methods described in Embodiments 1 to 7.

[0420] For example, when the plurality of ROs is configured based on Embodiment 5, the ROs can be included in uplink RB sets, respectively, each of which includes one RO. In addition, the uplink RB sets can be included in one uplink active BWP. In other words, one uplink active BWP can include a plurality of RB sets, and a guard band (or guard PRB) can exist between the RB sets. Furthermore, each of the RB sets can include one RO. Accordingly, in one uplink active BWP, the number of RB sets and the number of ROs are the same.

[0421] As a more specific example, when the plurality of ROs is configured based on Option 5-1-3 of proposed method 5-1, a starting RB index of a specific RO included in the plurality of ROs can be determined based on (i) a lowest RB index of an RB set including the specific RO, (ii) a starting RB index of an RO positioned at a lowest frequency, and (iii) a lowest RB index of an RB set including the RO positioned at the lowest frequency.

[0422] More specifically, a value of the starting RB index of the specific RO is obtained by adding a value of the lowest RB index of the RB set including the specific RO to an offset value. The offset value can be obtained by subtracting a value of the lowest RB index of the RB set including the RO positioned at the lowest frequency from a value of the starting RB index of the RO positioned at the lowest frequency.

[0423] A starting RB index of each of all the plurality of ROs including the specific RO can be determined based on (i) a lowest RB index of each RB set including each RO, (ii) a starting RB index of an RO positioned at a lowest frequency, and (iii) a lowest RB index of an RB set including the RO positioned at the lowest frequency.

[0424] In response to the PRACH, the UE can receive a RAR. After receiving the RAR, a PUSCH included in Msg.3 can be transmitted. Alternatively, a Msg.A PUSCH included in the same Msg.A as the PRACH can be transmitted. The PO on which the Msg.A PUSCH is transmitted can also be configured by a combination of one or more of the methods described in Embodiments 1 to 7.

[0425] Regarding the guard band positioned between the RB sets, the guard band can be configured based on Embodiment 6.

[0426] For example, according to Embodiment 6, even when UE-specific guard band information for each uplink RB set is received, the multiple ROs can be configured based on each uplink RB set being configured based on nominal guard band information.

[0427] Even when UE-specific guard band information for each uplink RB set is received, the multiple POs can be configured based on each uplink RB set being configured based on nominal guard band information. Even when UE-specific guard band information for each uplink RB set is received, a PUCCH including a HARQ ACK transmitted by the UE in response to receiving Msg.4 can be configured based on each uplink RB set being configured based on nominal guard band information.

[0428] The methods of Option 5-1-3 and Embodiment 6 can be performed in combination with each other, or can be independently performed. The operations of Embodiments 1 to 7 can also be performed in combination with each other or can be independently performed.

[0429] In addition to the operations described with reference to Figure 18 , the operations described with reference to Figures 1 to 17 and / or one or more of the operations described in Embodiments 1 to 7 can be performed in combination and additionally. For example, the UE can perform uplink LBT before transmitting the PRACH. In addition, the UE can receive RMSI including information on the PRACH before transmitting the PRACH.

[0430] Examples of applying the communication system of the present disclosure

[0431] The various descriptions, functions, processes, proposals, methods, and / or operation flowcharts of the present disclosure described herein can be applied to, but are not limited to, various fields requiring wireless communication / connection (e.g., 5G) between devices.

[0432] More specific examples will be described below with reference to the accompanying drawings. In the following drawings / descriptions, like numbers refer to the same or corresponding hardware blocks, software blocks, or functional blocks unless otherwise indicated.

[0433] Figure 19 A communication system 1 to which the disclosure is applied is illustrated.

[0434] Referring to Figure 19 , the communication system 1 to which the disclosure is applied includes wireless devices, a BS, and a network. The wireless device is a device that performs communication using a radio access technology (RAT) (e.g., 5G NR (or a new RAT) or LTE), also referred to as a communication / radio / 5G device. The wireless device can include, but is not limited to, a robot 100a, vehicles 100b-1 and 100b-2, an extended reality (XR) device 100c, a handheld device 100d, a home appliance 100e, an IoT device 100f, and an artificial intelligence (AI) device / server 400. For example, the vehicle can include a vehicle having a wireless communication function, an autonomous driving vehicle, and a vehicle capable of vehicle-to-vehicle (V2V) communication. Herein, the vehicle can include an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device can include an augmented reality (AR) / virtual reality (VR) / mixed reality (MR) device, and can be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) mounted in a vehicle, a television (TV), a smartphone, a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, etc. The handheld device can include a smartphone, a smartpad, a wearable device (e.g., a smartwatch or smartglasses), and a computer (e.g., a laptop computer). The home appliance can include a TV, a refrigerator, a washing machine, etc. The IoT device can include a sensor, a smartmeter, etc. For example, the BS and the network can be implemented as a wireless device, and a specific wireless device 200a can operate as a BS / network node with respect to other wireless devices.

[0435] The wireless devices 100a to 100f can be connected to the network 300 via the BS 200. The AI technology can be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f can be connected to the AI server 400 via the network 300. The network 300 can be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f can communicate with each other through the BS 200 / network 300, the wireless devices 100a to 100f can perform direct communication (e.g., sidelink communication) with each other without intervention of the BS / network. For example, the vehicles 100b-1 and 100b-2 can perform direct communication (e.g., V2V / vehicle-to-everything (V2X) communication). The IoT device (e.g., a sensor) can perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0436] Wireless communication / connections 150a, 150b, and 150c can be established between the wireless devices 100a-100f / BS 200 and between the BSs 200. Herein, the wireless communication / connections can be established by various RATs (e.g., 5G NR) such as UL / DL communication 150a, sidelink communication 150b (or D2D communication), or inter-BS communication (e.g., relay or integrated access backhaul (IAB)). Wireless signals can be transmitted and received between the wireless devices, between the wireless devices and the BSs, and between the BSs through the wireless communication / connections 150a, 150b, and 150c. For example, signals can be transmitted and received via various physical channels through the wireless communication / connections 150a, 150b, and 150c. To this end, at least a part of various configuration information for processes for transmitting / receiving wireless signals, various signal processing procedures (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and resource allocation procedures can be performed based on various proposals of the disclosure.

[0437] Examples of wireless devices to which the disclosure is applied

[0438] Figure 20 A wireless device suitable for the disclosure is shown.

[0439] Reference Figure 20 The first wireless device 100 and the second wireless device 200 can transmit wireless signals through various RATs (e.g., LTE and NR). The {first wireless device 100 and the second wireless device 200} can correspond to Figure 19 {wireless device 100x and BS 200} and / or {wireless device 100x and wireless device 100x} of the disclosure.

[0440] The first wireless device 100 can include one or more processors 102 and one or more memories 104, and further include one or more transceivers 106 and / or one or more antennas 108. The processor(s) 102 can control the memory(s) 104 and / or the transceiver(s) 106, and can be configured to implement the descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed in this document. For example, the processor(s) 102 can process information in the memory(s) 104 to generate first information / signals, and then transmit wireless signals including the first information / signals through the transceiver(s) 106. The processor(s) 102 can receive wireless signals including second information / signals through the transceiver(s) 106, and then store information obtained by processing the second information / signals in the memory(s) 104. The memory(s) 104 can be connected to the processor(s) 102, and can store various information related to operations of the processor(s) 102. For example, the memory(s) 104 can store software code including instructions for performing all or a part of processes controlled by the processor(s) 102 or for implementing the descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed in this document. The processor(s) 102 and the memory(s) 104 can be a part of a communication modem / circuitry / chip designed to implement a RAT (e.g., LTE or NR). The transceiver(s) 106 can be connected to the processor(s) 102 and transmit and / or receive wireless signals through the one or more antennas 108. Each of the transceiver(s) 106 can include a transmitter and / or a receiver. The transceiver(s) 106 can be used interchangeably with radio frequency (RF) unit(s). In the present disclosure, a wireless device can be a communication modem / circuitry / chip.

[0441] The second wireless device 200 can include one or more processors 202 and one or more memories 204, and further include one or more transceivers 206 and / or one or more antennas 208. The processor(s) 202 can control the memory(s) 204 and / or the transceiver(s) 206, and can be configured to implement the descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed in the present document. For example, the processor(s) 202 can process information in the memory(s) 204 to generate third information / signals, and then transmit wireless signals including the third information / signals through the transceiver(s) 206. The processor(s) 202 can receive wireless signals including fourth information / signals through the transceiver(s) 106, and then store information obtained by processing the fourth information / signals in the memory(s) 204. The memory(s) 204 can be connected to the processor(s) 202 and store various information related to operations of the processor(s) 202. For example, the memory(s) 204 can store software code including instructions for performing all or a part of the processes controlled by the processor(s) 202 or for implementing the descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed in the present document. The processor(s) 202 and the memory(s) 204 can be part of a communication modem / circuitry / chip designed to implement a RAT (e.g., LTE or NR). The transceiver(s) 206 can be connected to the processor(s) 202 and transmit and / or receive wireless signals through the one or more antennas 208. Each transceiver 206 can include a transmitter and / or a receiver. The transceiver(s) 206 can be used interchangeably with RF unit(s). In the present disclosure, a wireless device can be a communication modem / circuitry / chip.

[0442] Now, the hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers can be implemented by, but are not limited to, the one or more processors 102 and 202. For example, the one or more processors 102 and 202 can implement one or more layers (e.g., functional layers such as physical (PHY), media access control (MAC), radio link control (RLC), packet data convergence protocol (PDCP), RRC, and service data adaptation protocol (SDAP)). The one or more processors 102 and 202 can generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in the present document. The one or more processors 102 and 202 can generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in the present document, and provide the messages, control information, data, or information to the one or more transceivers 106 and 206. The one or more processors 102 and 202 can generate signals (e.g., baseband signals) including the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in the present document, and provide the generated signals to the one or more transceivers 106 and 206. The one or more processors 102 and 202 can receive signals (e.g., baseband signals) from the one or more transceivers 106 and 206 and acquire the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in the present document.

[0443] The one or more processors 102 and 202 can be referred to as controllers, microcontrollers, microprocessors, or microcomputers. The one or more processors 102 and 202 can be implemented by hardware, firmware, software, or a combination thereof. For example, one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) can be included in the one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in the present document can be implemented using firmware or software, and the firmware or software can be configured to include modules, processes, or functions. The firmware or software configured to perform the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in the present document can be included in the one or more processors 102 and 202 or can be stored in the one or more memories 104 and 204 and driven by the one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in the present document can be implemented using firmware or software in the form of codes, instructions, and / or instruction sets.

[0444] The one or more memories 104 and 204 can be connected to the one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, codes, instructions, and / or commands. The one or more memories 104 and 204 can be configured to include read-only memories (ROMs), random access memories (RAMs), electrically programmable read-only memories (EPROMs), flash memories, hard disk drives, registers, cache memories, computer-readable storage media, and / or combinations thereof. The one or more memories 104 and 204 can be located inside and / or outside the one or more processors 102 and 202. The one or more memories 104 and 204 can be connected to the one or more processors 102 and 202 by various techniques such as wired or wireless connections.

[0445] The one or more transceivers 106 and 206 can transmit user data, control information, and / or radio signals / channels mentioned in the methods and / or operational flowcharts of the present document, to one or more other apparatuses. The one or more transceivers 106 and 206 can receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in the present document, from one or more other apparatuses. For example, the one or more transceivers 106 and 206 can be connected to the one or more processors 102 and 202 and transmit and receive radio signals. For example, the one or more processors 102 and 202 can perform control so that the one or more transceivers 106 and 206 can transmit user data, control information, or radio signals to one or more other apparatuses. The one or more processors 102 and 202 can perform control so that the one or more transceivers 106 and 206 can receive user data, control information, or radio signals from one or more other apparatuses. The one or more transceivers 106 and 206 can be connected to the one or more antennas 108 and 208, and the one or more transceivers 106 and 206 can be configured to transmit and receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in the present document, through the one or more antennas 108 and 208. In the present document, the one or more antennas can be a plurality of physical antennas or a plurality of logical antennas (for example, antenna ports). The one or more transceivers 106 and 206 can convert received radio signals / channels from RF band signals to baseband signals in order to process received user data, control information, and radio signals / channels using the one or more processors 102 and 202. The one or more transceivers 106 and 206 can convert user data, control information, and radio signals / channels processed using the one or more processors 102 and 202 from baseband signals to RF band signals. To this end, the one or more transceivers 106 and 206 can include (analog) oscillators and / or filters.

[0446] Examples of use of wireless devices to which the present disclosure is applied

[0447] Figure 21 Another example applied to the wireless devices of the present disclosure is shown. The wireless devices can be implemented in various forms according to use cases / services (refer to Figure 19 ) in various forms.

[0448] Referring to Figure 21 , the wireless devices 100 and 200 can correspond to Figure 20wireless devices 100 and 200, and can be configured to include various elements, components, units / portions, and / or modules. For example, each of the wireless devices 100 and 200 can include a communication unit 110, a control unit 120, a memory unit 130, and additional components 140. The communication unit 110 can include a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 can include Figure 20 one or more processors 102 and 202 and / or one or more memories 104 and 204. For example, the transceiver 114 can include Figure 20 one or more transceivers 106 and 206 and / or one or more antennas 108 and 208. The control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140, and provides overall control to the wireless device. For example, the control unit 120 can control electric / mechanical operations of the wireless device based on programs / codes / instructions / information stored in the memory unit 130. The control unit 120 can transmit information stored in the memory unit 130 to the outside (e.g., other communication devices) via the communication unit 110 through wireless / wired interfaces, or store, in the memory unit 130, information received from the outside (e.g., other communication devices) via the communication unit 110 through wireless / wired interfaces.

[0449] The additional components 140 can be variously configured according to the type of the wireless device. For example, the additional components 140 can include at least one of a power supply unit / battery, an input / output (I / O) unit, a driving unit, and a computing unit. The wireless device can be implemented in (but not limited to) robots (100a), vehicles (100b-1 and 100b-2), XR devices (100c), hand-held devices (100d), home appliances (100e), IoT devices (100f), digital broadcast terminals, holographic devices, public safety devices, MTC devices, medical devices, financial technology devices (or financial devices), security devices, climate / environment devices, AI servers / devices (400), BSs (200), network nodes, etc. According to the use case / service, the wireless device can be mobile or fixed. Figure 19 Figure 19 The wireless devices 100 and 200 can be variously configured according to the type of the wireless device. For example, the wireless devices 100 and 200 can be implemented in (but not limited to) robots (100a), vehicles (100b-1 and 100b-2), XR devices (100c), hand-held devices (100d), home appliances (100e), IoT devices (100f), digital broadcast terminals, holographic devices, public safety devices, MTC devices, medical devices, financial technology devices (or financial devices), security devices, climate / environment devices, AI servers / devices (400), BSs (200), network nodes, etc. According to the use case / service, the wireless device can be mobile or fixed. Figure 19 Figure 19 The wireless devices 100 and 200 can be variously configured according to the type of the wireless device. For example, the wireless devices 100 and 200 can be implemented in (but not limited to) robots (100a), vehicles (100b-1 and 100b-2), XR devices (100c), hand-held devices (100d), home appliances (100e), IoT devices (100f), digital broadcast terminals, holographic devices, public safety devices, MTC devices, medical devices, financial technology devices (or financial devices), security devices, climate / environment devices, AI servers / devices (400), BSs (200), network nodes, etc. According to the use case / service, the wireless device can be mobile or fixed. Figure 19 Figure 19 The wireless devices 100 and 200 can be variously configured according to the type of the wireless device. For example, the wireless devices 100 and 200 can be implemented in (but not limited to) robots (100a), vehicles (100b-1 and 100b-2), XR devices (100c), hand-held devices (100d), home appliances (100e), IoT devices (100f), digital broadcast terminals, holographic devices, public safety devices, MTC devices, medical devices, financial technology devices (or financial devices), security devices, climate / environment devices, AI servers / devices (400), BSs (200), network nodes, etc. According to the use case / service, the wireless device can be mobile or fixed. Figure 19 Figure 19 The wireless devices 100 and 200 can be variously configured according to the type of the wireless device. For example, the wireless devices 100 and 200 can be implemented in (but not limited to) robots (100a), vehicles (100b-1 and 100b-2), XR devices (100c), hand-held devices (100d), home appliances (100e), IoT devices (100f), digital broadcast terminals, holographic devices, public safety devices, MTC devices, medical devices, financial technology devices (or financial devices), security devices, climate / environment devices, AI servers / devices (400), BSs (200), network nodes, etc. According to the use case / service, the wireless device can be mobile or fixed.

[0450] The wireless devices 100 and 200 can be variously configured according to the type of the wireless device. For example, the wireless devices 100 and 200 can be implemented in (but not limited to) robots (100a), vehicles (100b-1 and 100b-2), XR devices (100c), hand-held devices (100d), home appliances (100e), IoT devices (100f), digital broadcast terminals, holographic devices, public safety devices, MTC devices, medical devices, financial technology devices (or financial devices), security devices, climate / environment devices, AI servers / devices (400), BSs (200), network nodes, etc. According to the use case / service, the wireless device can be mobile or fixed. Figure 21 ​​​​In the above-described embodiments, various elements, components, units / portions, and / or modules in the wireless devices 100 and 200 can all be connected to one another through wired interfaces, or at least some of them can be wirelessly connected through the communication units 110. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 can be connected through wired interfaces, and the control unit 120 and the first units (e.g., 130 and 140) can be wirelessly connected through the communication unit 110. The various elements, components, units / portions, and / or modules in the wireless devices 100 and 200 can further include one or more elements. For example, the control unit 120 can be configured with a set of one or more processors. For example, the control unit 120 can be configured with a set of communication control processor, application processor, electronic control unit (ECU), graphic processing unit, and memory control processor. In another example, the memory 130 can be configured with a set of RAM, dynamic RAM (DRAM), ROM, flash memory, volatile memory, non-volatile memory, and / or a combination thereof.

[0451] Examples of vehicles or autonomous driving vehicles to which the present disclosure is applied

[0452] Figure 22 Examples of vehicles or autonomous driving vehicles to which the present disclosure is applied

[0453] Reference Signs Figure 22 The vehicle or autonomous driving vehicle 100 can include an antenna unit 108, a communication unit 110, a control unit 120, a driving unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 can be configured as a part of the communication unit 110. The blocks 110 / 130 / 140a to 140d correspond to the blocks 110 / 130 / 140 of Figure 21 , respectively.

[0454] The communication unit 110 can transmit and receive signals (e.g., data and control signals) to and from external devices such as other vehicles, BSs (e.g., gNBs and roadside units), and servers. The control unit 120 can perform various operations by controlling elements of the vehicle or the autonomous driving vehicle 100. The control unit 120 can include an ECU. The driving unit 140a can enable the vehicle or the autonomous driving vehicle 100 to travel on a road. The driving unit 140a can include an engine, a motor, a powertrain, a wheel, a brake, a steering device, etc. The power supply unit 140b can supply power to the vehicle or the autonomous driving vehicle 100 and include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c can acquire information about a vehicle state, surrounding environment information, user information, etc. The sensor unit 140c can include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor, a heading sensor, a position module, a vehicle forward / backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illumination sensor, a pedal position sensor, etc. The autonomous driving unit 140d can implement a technology for maintaining a lane in which the vehicle is traveling, a technology for automatically adjusting a speed (e.g., adaptive cruise control), a technology for autonomously traveling along a determined path, a technology for traveling by automatically setting a route if a destination is set, etc.

[0455] For example, the communication unit 110 can receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d can generate an autonomous driving route and a driving plan from the obtained data. The control unit 120 can control the driving unit 140a so that the vehicle or the autonomous driving vehicle 100 can move along the autonomous driving route according to the driving plan (e.g., speed / direction control). During autonomous driving, the communication unit 110 can acquire recent traffic information data from an external server aperiodically / periodically and surrounding traffic information data from a neighboring vehicle. During autonomous driving, the sensor unit 140c can obtain information about a vehicle state and / or surrounding environment information. The autonomous driving unit 140d can update the autonomous driving route and the driving plan based on newly obtained data / information. The communication unit 110 can transmit information about a vehicle position, an autonomous driving route, and / or a driving plan to an external server. The external server can predict traffic information data using an AI technology based on information collected from vehicles or autonomous driving vehicles and provide the predicted traffic information data to the vehicles or the autonomous driving vehicles.

[0456] Those skilled in the art will appreciate that the disclosure can be practiced in other specific ways than those set forth herein without departing from the spirit and essential characteristics of the disclosure. The foregoing embodiments are, therefore, to be construed in all aspects as illustrative and not restrictive. The scope of the disclosure should be determined by the appended claims and their legal equivalents (and not by the foregoing description), which are intended to embrace all changes falling within the meaning and equivalents of the appended claims.

[0457] Industrial applicability

[0458] As described above, the disclosure is applicable to various wireless communication systems.

Claims

1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising: Send message A, which includes the Physical Random Access Channel (PRACH) and the Physical Uplink Shared Channel (PUSCH); as well as Message B is received based on message A. Specifically, the PRACH is transmitted on a specific PRACH time (RO) within a Frequency Division Multiplexing (FDMed) time (RO), and the PUSCH is transmitted on a specific PUSCH time (PO). Specifically, the starting RB index for the specific RO is determined by adding (i) the offset to (ii) the lowest RB index of the first RB set including the specific RO, and The offset is obtained by subtracting the lowest RB index of the second set of RBs including the lowest RO from the starting RB index of the lowest RO, wherein the lowest RO is the RO with the lowest frequency among the FDMed ROs. One uplink active bandwidth portion comprises multiple sets of RBs, and guard bands exist between the sets of RBs, with each set of RBs including one RO.

2. The method according to claim 1, wherein, The minimum gap size between the specific RO and the specific PO is 2 symbols based on a subcarrier spacing (SCS) of 15 or 30 kHz, and the minimum gap size is 4 symbols based on a 60 kHz SCS.

3. The method according to claim 1, wherein, The PUSCH is transmitted via interleaving.

4. The method according to claim 1, wherein, Select the specific PO from the POs mapped to the specific RO.

5. A user equipment (UE) for transmitting and receiving signals in a wireless communication system, the UE comprising: At least one transceiver; At least one processor; as well as At least one memory, operatively coupled to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform a specific operation. The specific operations include: Send message A, which includes the Physical Random Access Channel (PRACH) and the Physical Uplink Shared Channel (PUSCH); and Message B is received based on message A. Specifically, the PRACH is transmitted on a specific PRACH time (RO) within a Frequency Division Multiplexing (FDMed) time (RO), and the PUSCH is transmitted on a specific PUSCH time (PO). Specifically, the starting RB index for the specific RO is determined by adding (i) the offset to (ii) the lowest RB index of the first RB set including the specific RO, and The offset is obtained by subtracting the lowest RB index of the second set of RBs including the lowest RO from the starting RB index of the lowest RO, wherein the lowest RO is the RO with the lowest frequency among the FDMed ROs. One uplink active bandwidth portion comprises multiple sets of RBs, and guard bands exist between the sets of RBs, with each set of RBs including one RO.

6. The UE according to claim 5, wherein, The minimum gap size between the RO and the PO is 2 symbols based on a subcarrier spacing (SCS) of 15 or 30 kHz, and the minimum gap size is 4 symbols based on a 60 kHz SCS.

7. The UE according to claim 5, wherein, The PUSCH is transmitted via interleaving.

8. The UE according to claim 5, wherein, Select the PO from the POs mapped to the RO.

9. A method for transmitting and receiving signals by a base station (BS) operating in a wireless communication system, the method comprising: Receive message A, which includes the Physical Random Access Channel (PRACH) and the Physical Uplink Shared Channel (PUSCH); as well as Message B is sent based on message A. Specifically, the PRACH is received on a specific PRACH timing (RO) within a Frequency Division Multiplexing (FDMed) timing (RO), and the PUSCH is received on a specific PUSCH timing (PO). Specifically, the starting RB index for the specific RO is determined by adding (i) the offset to (ii) the lowest RB index of the first RB set including the specific RO, and The offset is obtained by subtracting the lowest RB index of the second set of RBs including the lowest RO from the starting RB index of the lowest RO, wherein the lowest RO is the RO with the lowest frequency among the FDMed ROs. One uplink active bandwidth portion comprises multiple sets of RBs, and guard bands exist between the sets of RBs, with each set of RBs including one RO.

10. A base station (BS) for transmitting and receiving signals in a wireless communication system, the BS comprising: At least one transceiver; At least one processor; as well as At least one memory, operatively coupled to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform a specific operation. The specific operations include: Receive message A, which includes the Physical Random Access Channel (PRACH) and the Physical Uplink Shared Channel (PUSCH); and Message B is sent based on message A. Specifically, the PRACH is received on a specific PRACH timing (RO) within a Frequency Division Multiplexing (FDMed) timing (RO), and the PUSCH is received on a specific PUSCH timing (PO). Specifically, the starting RB index for the specific RO is determined by adding (i) the offset to (ii) the lowest RB index of the first RB set including the specific RO, and The offset is obtained by subtracting the lowest RB index of the second set of RBs including the lowest RO from the starting RB index of the lowest RO, wherein the lowest RO is the RO with the lowest frequency among the FDMed ROs. One uplink active bandwidth portion comprises multiple sets of RBs, and guard bands exist between the sets of RBs, with each set of RBs including one RO.

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