Method and apparatus for performing sidelink communication in wireless communication system

Abstract

A method of configuring a sidelink resource pool in a user equipment (UE) in a wireless communication system may include receiving, by the UE, resource pool configuration information from a base station based on higher layer signaling; transmitting sidelink control information (SCI) to another UE based on the resource pool configuration information; and performing sidelink communication with the other UE, and the resource pool configuration information may be information based on a sidelink resource pool configuration of an unlicensed frequency band.

Description

Technical Field

[0001] The present disclosure relates to a method and apparatus for performing sidelink communication in a wireless communication system. Background Art

[0003] The International Telecommunication Union (ITU) has developed the International Mobile Telecommunications (IMT) framework and standards. Likewise, ongoing discussions on 5th generation (5G) communications are ongoing through a process called “IMT for 2020 and beyond”.

[0004] In order to meet the requirements requested by "IMT for 2020 and beyond", various proposals have been made to support various numerologies regarding time-frequency resource unit standards by considering various scenarios, service requirements, and potential system compatibility in the 3rd Generation Partnership Project (3GPP) New Radio (NR) system.

[0005] In addition, to overcome the adverse channel environment such as high path loss, phase noise and frequency offset that occurs at high carrier frequencies, the NR system can support the transmission of physical signals / channels through multiple beams. In this way, the NR system can support a variety of applications, such as enhanced mobile broadband (eMBB), massive machine type communication (mMTC) / ultra-machine type communication (uMTC), and ultra-reliable and low-latency communication (URLLC).

[0006] In addition, vehicle-to-everything (V2X) communication may be considered, i.e., a communication method for exchanging or sharing road infrastructure and information (e.g., traffic conditions) by communicating with other vehicles during driving. V2X may include, for example, vehicle-to-vehicle (V2V) (which may refer to Long Term Evolution (LTE)-based / New Radio (NR)-based communication between vehicles), vehicle-to-pedestrian (V2P) (which may refer to LTE-based / NR-based communication between a vehicle and a user equipment (UE) carried by a user), and vehicle-to-infrastructure / network (V2I / N) (which may refer to LTE-based / NR-based communication between a vehicle and a roadside unit (RSU) / network). The RSU may be a transportation infrastructure entity configured by a base station or a fixed UE, such as an entity that sends speed notifications to a vehicle. Summary of the invention Technical Topics

[0008] The technical subject matter of the present disclosure relates to a method and apparatus for performing side link (SL) communication in a wireless communication system.

[0009] The technical subject matter of the present disclosure relates to a method and apparatus for configuring a SL resource pool in an unlicensed band.

[0010] The technical subject matter of the present disclosure relates to a method and apparatus for configuring a SL resource pool in an unlicensed band based on a resource block set (RBS) and interlace / subchannel.

[0011] The technical subject matter of the present disclosure relates to a method and apparatus for allocating SL interleaving indexes based on a common resource block (CRB).

[0012] The technical subject matter of the present disclosure relates to a method and apparatus for mapping SL interlace indexes and subchannel indexes.

[0013] The technical subject matter of the present disclosure relates to a method and apparatus for indicating an SL resource pool configured in an unlicensed band.

[0014] The technical subject matter of the present disclosure relates to a method and apparatus for configuring a SL resource pool in an unlicensed band in consideration of region-specific regulations.

[0015] Technical subjects that can be implemented from the present disclosure are not limited to the above-mentioned technical subjects, and other technical subjects not described herein can be clearly understood by ordinary technicians in the field to which the present disclosure belongs based on the following description.

[0016] Technical Solution

[0017] According to one aspect of the present disclosure, a method for configuring a sidelink resource pool in a user equipment (UE) in a wireless communication system may include: receiving resource pool configuration information from a base station based on higher layer signaling by the UE; sending sidelink control information (SCI) to another UE base station based on the resource pool configuration information; and performing sidelink communication with the other UE, wherein the resource pool configuration information may be information on a sidelink resource pool configuration based on an unlicensed band.

[0018] In addition, according to an aspect of the present disclosure, the side link resource pool configuration information of the unlicensed band may include at least one of the following: subchannel configuration and index information based on a single side link bandwidth part (SL BWP) in a single carrier bandwidth, interleaving configuration and index information, and resource block set (RBS) configuration and index information.

[0019] In addition, according to one aspect of the present disclosure, a common resource block (CRB)-to-interlace index mapping and an interlace index-to-subchannel index mapping may be determined based on the sidelink resource pool configuration information of the unlicensed band.

[0020] In addition, according to one aspect of the present disclosure, resources used to perform physical sidelink shared channel (PSSCH) transmission and the number of channels of the RBS in the sidelink resource pool may be indicated based on the SCI.

[0021] According to one aspect of the present disclosure, the number of subchannels of the resources can be determined as one of multiple values ​​based on at least one of a subcarrier spacing (SCS), a number of interlaces within the sidelink resource pool, and a subchannel-to-interlace allocation relationship.

[0022] Technical Effects

[0023] According to the present disclosure, a method of performing side link (SL) communication in a wireless communication system may be provided.

[0024] According to the present disclosure, a method of configuring a SL resource pool in an unlicensed band may be provided.

[0025] According to the present disclosure, a method and apparatus for configuring a SL resource pool in an unlicensed band based on a resource block set (RBS) and interlace / subchannel may be provided.

[0026] According to the present disclosure, a method and apparatus for allocating SL interleaving indexes based on a common resource block (CRB) may be provided.

[0027] According to the present disclosure, a method and apparatus for mapping an SL interleaving index and a subchannel index may be provided.

[0028] According to the present disclosure, a method of indicating a SL resource pool configured in an unlicensed band may be provided.

[0029] According to the present disclosure, it is related to a method and apparatus for configuring a SL resource pool in an unlicensed band taking into account region-specific regulations.

[0030] Effects achievable from the present disclosure are not limited to the above-described effects, and other effects not described herein may be clearly understood by a person of ordinary skill in the art to which the present disclosure pertains from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 An example of describing a New Radio (NR) frame structure to which the present disclosure is applicable is shown.

[0033] Figure 2 The NR resource structure to which the present disclosure is applicable is shown.

[0034] Figure 3 The NR side link time slot structure to which the present disclosure is applicable is shown.

[0035] Figure 4 NR side link frequencies to which the present disclosure can be applied are shown.

[0036] Figure 5 The NR side link resource pool configuration to which the present disclosure can be applied is shown.

[0037] Figure 6 An unlicensed frequency band for each area used for NR sidelink communication to which the present disclosure is applicable is shown.

[0038] Figure 7 The use of a 5 gigahertz (GHz) unlicensed frequency band to which the present disclosure may be applied is shown.

[0039] Figure 8 A method of increasing bandwidth in consideration of power spectral density (PSD) limitations to which the present disclosure may be applied is shown.

[0040] Fig. 9 A method of configuring a guard band in consideration of a shared frequency band within a cell to which the present disclosure can be applied is shown.

[0041] Fig.10 An interleaving-based resource block (RB) resource assignment method to which the present disclosure can be applied is shown.

[0042] Fig.11 A method of performing a listen-before-talk (LBT) procedure in an unlicensed band to which the present disclosure may be applied is shown.

[0043] Fig.12 Channel Occupancy Time (COT) sharing and discovery burst transmission to which the present disclosure may be applied are shown.

[0044] Fig.13 A method of applying cyclic prefix (CP) extension to an uplink when COT sharing is performed between a downlink and an uplink, to which the present disclosure may be applied, is shown.

[0045] Fig.14A semi-static channel access procedure to which the present disclosure can be applied is shown.

[0046] Fig.15 A method of performing channel occupation to which the present disclosure can be applied is shown.

[0047] Fig.16 A method of configuring a bandwidth part (BWP) in a sidelink unlicensed band and a resource block set (RBS) in a resource pool, to which the present disclosure can be applied, is shown.

[0048] Fig.17 A method for configuring a side link unlicensed band resource pool to which the present disclosure can be applied is shown.

[0049] Fig.18 A sidelink unlicensed band resource pool configuration based on frequency resources using interleaved assignment to which the present disclosure can be applied is shown.

[0050] Fig.19 A side link unlicensed band resource pool configuration method to which the present disclosure can be applied is shown.

[0051] Fig. 20 A case where subchannel indices are mapped to consecutive sidelink interlace indices based on a uniform CRB-to-interlace index relationship to which the present disclosure can be applied is shown.

[0052] Fig.21 A case to which the present disclosure can be applied is shown in which CRBs are non-uniformly assigned to interleaving indices and a subchannel index is mapped to each of consecutive interleaving indices.

[0053] Fig. 22 A method of assigning a subchannel index based on an interleaving index within a lowest interleaving block in a frequency in a resource pool, to which the present disclosure may be applied, is shown.

[0054] Fig.23 A method of applying a block interleaver to which the present disclosure may be applied is shown.

[0055] Fig.24 A method for configuring non-uniform CRBs to interleaving indexes based on a combination of a block interleaver and a random function, to which the present disclosure is applicable, is shown.

[0056] Fig.25 A method of mapping each of subchannel indexes constituting a single resource pool to a non-contiguous side link index, to which the present disclosure is applicable, is shown.

[0057] Fig.26An interleaving structure to which the present disclosure can be applied is shown.

[0058] Fig. 27 An interleaving structure to which the present disclosure can be applied is shown.

[0059] Fig.28 A side link frequency resource assignment method to which the present disclosure can be applied is shown.

[0060] Fig.29 A frequency resource assignment method based on a unified interleaving structure to which the present disclosure can be applied is shown.

[0061] Fig.30 A frequency resource assignment method based on a non-uniform interleaving structure to which the present disclosure can be applied is shown.

[0062] Fig.31 is a flow chart illustrating a method of assigning sidelink unlicensed band frequency resources to which the present disclosure may be applied.

[0063] Fig.32 is a diagram showing a base station device and a terminal device to which the present disclosure can be applied. DETAILED DESCRIPTION

[0065] Various examples of the present disclosure will be described more fully below with reference to the accompanying drawings so that those skilled in the art to which the present disclosure pertains can easily implement these examples. However, the present disclosure may be implemented in various forms and is not limited to the examples described herein.

[0066] When describing examples of the present disclosure, detailed descriptions of known configurations or functions may be omitted for clarity and conciseness. Throughout the drawings and detailed description, unless otherwise specified, the same reference numerals are understood to refer to the same elements, features, and structures.

[0067] It will be understood that when an element is referred to as being "connected to," "coupled to," or "accessed to" another element, it may be directly connected, coupled to, or accessed to the other element, or intervening elements may be present. Furthermore, it will be understood that when an element is described as "including / comprising" or "having" another element, it specifies the presence of the other element, but does not preclude the presence of the other element described in other ways.

[0068] In addition, terms such as first, second, etc. can be used to describe the elements in the description herein. These terms are used to distinguish an element from another element. Therefore, the terms do not limit the elements, arrangement order, or sequence, etc. Therefore, the first element in one example can be referred to as the second element in another example. Likewise, the second element in one example can be referred to as the first element in another example.

[0069] Here, providing distinguishing elements is only for the purpose of clearly explaining each feature, and does not mean that the elements must be separated from each other. That is, multiple elements can be integrated into a single hardware or software unit. Moreover, a single element can be distributed to multiple hardware or software units. Therefore, unless otherwise described, integrated or distributed examples are also included in the scope of this disclosure.

[0070] Here, the elements described in various examples may not necessarily be necessary and may be partially optional. Therefore, examples including a partial set of elements described in the examples are also included in the scope of this disclosure. In addition, examples including another element other than the elements described in various examples are also included in the scope of this disclosure.

[0071] The description described herein relates to a wireless communication network, and operations performed in the wireless communication network may be performed in a process in which a system (eg, base station) controlling the wireless network controls the network and transmits data, or may be performed in a user equipment.

[0072] Obviously, in a network including a base station and a plurality of network nodes, various operations performed for communicating with a UE may be performed by the base station or other network nodes other than the base station. Here, the term "base station (BS)" may be used interchangeably with other terms, such as a fixed station, a Node B, an eNodeB (eNB), a gNodeB (gNB), and an access point (AP). In addition, the term "terminal" may be used interchangeably with other terms, such as a user equipment (UE), a mobile station (MS), a mobile subscriber station (MSS), a subscriber station (SS), and a non-AP station (non-AP STA).

[0073] Here, sending or receiving a channel includes the meaning of sending or receiving information or signals through the corresponding channel. For example, sending a control channel means sending control information or signals through the control channel. Similarly, sending a data channel means sending data information or signals through the data channel.

[0074] In the following description, although the term “New Radio (NR) system” is used to distinguish a system according to various examples of the present disclosure from an existing system, the scope of the present disclosure is not limited thereto.

[0075] The New Radio (NR) system supports various subcarrier spacings (SCS) by considering various scenarios, service requirements, potential system compatibility, etc. In addition, in order to overcome the adverse channel environment such as high path loss, phase noise, and frequency offset that occur at high carrier frequencies, the NR system can support the transmission of physical signals / channels through multiple beams. In this way, the NR system can support a variety of applications, such as enhanced mobile broadband (eMBB), massive machine type communication (mMTC) / ultra machine type communication (uMTC), and ultra-reliable and low-latency communication (URLLC).

[0076] Here, 5G mobile communication technology can be defined by including the existing advanced long term evolution (LTE-A) system and the above-mentioned NR system. That is, 5G mobile communication technology can be operated by considering backward compatibility with previous systems and newly defined NR systems. Therefore, subsequent 5G mobile communication may include technologies based on NR system operation and technologies based on previous systems (e.g., LTE-A, LTE), but is not limited to a specific system.

[0077] First, the physical resource structure of the NR system to which the present disclosure is applied will be briefly described.

[0078] Figure 1 An example of an NR frame structure according to an example of the present invention is shown.

[0079] In NR, the basic unit of time domain can be T c =1 / (Δf max ·N f ). Here, Δf max =480·10 3 And N f =4096. In addition, κ = T s / T c =64 may be a constant related to the multiple relationship between the NR time unit and the LTE time unit. In LTE, T s =1 / (Δf ref ·N f,ref ),Δf ref =15·10 3 And N f,ref = 2048 can be defined as a reference time unit. The constant of the multiple relationship between the NR time basic unit and the LTE time basic unit can be defined as k = T s / T c =64.

[0080] Reference Figure 1 , which may include a time structure of a frame for downlink / uplink (DL / UL) transmission, which may include T f =(Δfmax N f / 100)·T s = 10 ms. Here, a single frame may include a time corresponding to T sf =(Δf max N f / 1000)·T s = 10 subframes of 1 ms. The number of consecutive OFDM symbols per subframe can be In addition, each frame may be divided into two half frames, and the half frame may include subframes 0 to 4 and subframes 5 to 9. Here, half frame 1 may include subframes 0 to 4, and half frame 2 may include subframes 5 to 9.

[0081] N TA Denotes the timing advance (TA) between downlink (DL) and uplink (UL). Here, according to the following equation 1, the transmission timing of the uplink transmission frame i is determined based on the downlink reception timing at the UE.

[0082] [Equation 1]

[0083] T TA =(N TA +N TA,offset )T c

[0084] N TA,offset Indicates the TA offset value due to duplex mode differences, etc. Basically, in frequency division duplex (FDD), N TA,offset = 0. In time division duplex (TDD), N can be defined by considering the margin of DL-UL switching time. TA,offset For example, in TDD (Time Division Duplex) of RF1 (Frequency Range 1) (which is a frequency below 6 GHz or lower), N TA,offset It can be 39936T C or 2600T C .39936T C =20.327μs and 25600T C =13.030μs. In addition, in FR2 (frequency range 2) of millimeter wave (mmWave), N TA,offset It can be 13792T C At this time, 39936T C =7.020μs.

[0085] Figure 2 An NR resource structure to which the present disclosure is applicable is shown.

[0086] Resource elements within a resource grid may be indexed based on each subcarrier spacing. Here, a single resource grid may be generated for each antenna port and each subcarrier spacing. Uplink / downlink transmission and reception may be performed based on the corresponding resource grid.

[0087] A resource block (RB) in the frequency domain is configured with 12 REs, and for every 12 REs, an RB index (n PRB ). The index of the RB may be used within a specific frequency band or system bandwidth. The index of the RB may be defined as shown in the following equation 2. Here, N RB sc represents the number of subcarriers in each RB, and k represents the subcarrier index.

[0088] [Equation 2]

[0089]

[0091] The digital parameter configuration can be configured differently to meet various services and requirements of the NR system. For example, one subcarrier spacing (SCS) can be supported in the LTE / LTE-A system, but multiple SCSs can also be supported in the NR system.

[0092] The new digital parameter configuration of the NR system supporting multiple SCSs can operate in a frequency range or carrier such as 3 GHz or less, 3 GHz-6 GHz, 6 GHz-52.6 GHz or more to solve the problem that a wide bandwidth cannot be obtained in a frequency range or carrier such as 700 MHz or 2 GHz.

[0093] Table 1 below shows an example of digital parameters supported by the NR system.

[0094] [Table 1]

[0095] μ <![CDATA[Δf=2 μ ·15[kHz]]]> Cyclic prefix 0 15 Normal 1 30 Normal 2 60 Normal, extended 3 120 Normal 4 240 Normal

[0096] Referring to Table 1 above, the digital parameter configuration may be defined based on the SCS used in the OFDM system, the cyclic prefix (CP) length, and the number of OFDM symbols per time slot. The above values ​​may be provided to the UE through higher layer parameters DL-BWP-mu and DL-BWP-cp for the downlink, and through higher layer parameters UL-BWP-mu and UL-BWP-cp for the uplink.

[0097] In the above Table 1, if μ=2 and SCS=60 kHz, normal CP and extended CP may be applied. In other frequency bands, only normal CP may be applied.

[0098] Here, a normal slot may be defined as a basic time unit for sending a single piece of data and control information in an NR system. The length of a normal slot may basically include 14 OFDM symbols. In addition, unlike a slot, a subframe may have an absolute time length corresponding to 1ms in an NR system and may be used as a reference time for the length of another time segment. Here, for the coexistence and backward compatibility of LTE and NR systems, the NR standard may require a time segment such as an LTE subframe.

[0099] For example, in LTE, data may be transmitted based on a transmission time interval (TTI) as a unit time. TTI may include at least one subframe unit. Here, even in LTE, a single subframe may be set to 1 ms and may include 14 OFDM symbols (or 12 OFDM symbols).

[0100] In addition, in the NR system, non-slots can be defined. Non-slots may refer to slots having at least one less symbol than the number of symbols of ordinary slots. For example, in the case of providing low latency such as ultra-reliable and low-latency communication (URLLC) services, latency can be reduced by non-slots having a smaller number of slots than the number of slots of ordinary slots. Here, the number of OFDM symbols included in the non-slots can be determined based on the frequency range. For example, non-slots having a length of 1 OFDM symbol in a frequency range of 6 GHz or higher can be considered. As another example, the number of symbols used to define a non-slot may include at least two OFDM symbols. Here, the number range of OFDM symbols included in the non-slots can be configured to have a micro-slot length of up to (ordinary slot length) -1. Here, although the number of OFDM symbols can be limited to 2, 4 or 7 as a non-slot standard, it is provided only as an example.

[0101] In addition, for example, SCS corresponding to μ = 1 and 2 can be used in unlicensed bands of 6 GHz or less, and SCS corresponding to μ = 3 and 4 can be used in unlicensed bands above 6 GHz. Here, for example, if μ = 4, it can be used for synchronization signal blocks (SSBs).

[0102] [Table 2]

[0103]

[0104] Table 2 shows the number of OFDM symbols per time slot for a normal CP set by subcarrier spacing. The number of time slots per frame and the number of time slots per subframe In Table 2, the values ​​are based on a normal slot with 14 OFDM symbols.

[0105] [Table 3]

[0106]

[0107] In Table 3, in the case where extended CP is applied (ie, μ=2 and SCS=60 kHz), the number of slots per frame and the number of slots per subframe based on normal slots where the number of OFDM symbols per slot is 12 are shown.

[0108] As described above, a single subframe may correspond to 1 ms on the time axis. Moreover, a single time slot may correspond to 14 symbols on the time axis. For example, a single time slot may correspond to 7 symbols on the time axis. Therefore, the number of time slots and the number of symbols that may be considered may be set differently within 10 ms corresponding to a single radio frame. Table 4 may show the number of time slots and the number of symbols according to each SCS. Although an SCS of 480 kHz may not be considered in Table 4, the present disclosure is not limited to such an example.

[0109] [Table 4]

[0110]

[0112] The V2X service may support a set of basic requirements for V2X services. These requirements are basically designed with full consideration of road safety services. Here, the V2X UE may exchange autonomous state information via the SL. The V2X UE may also exchange information with infrastructure nodes and / or pedestrians.

[0113] The V2X service (e.g., LTE Rel-15) may support at least one of: carrier aggregation in SL, high order modulation, latency reduction, transmit (Tx) diversity, and sTTI (transmission time interval). To this end, new features may be applied to V2X communication. More specifically, a V2X UE may operate in consideration of coexistence with other V2X UEs. For example, a V2X UE may use the same resource pool as other V2X UEs.

[0114] For example, by considering the use case for supporting V2X services as system aspect (SA) 1, the technical features can be classified mainly based on the four categories represented by Table 5 below, but not limited thereto. In Table 5, "vehicle platooning" may be a technology that enables multiple vehicles to dynamically form a group and operate similarly. "Extended sensor" may be a technology that enables the exchange of data collected from sensors or video images. "Advanced driving" may be a technology that enables a vehicle to drive based on semi-automation or fully automation. "Remote driving" may be a technology for remotely controlling a vehicle and a technology for providing an application. Based on this, further description related thereto is given through Table 5 below.

[0115] [Table 5]

[0116]

[0117] In addition, SA1 can support the case of operating in various systems (such as LTE and NR) because enhanced V2X (eV2X) supports technology for supporting the V2X service. For example, the NR V2X system can be the first V2X system. In addition, the LTE V2X system can be the second V2X system. That is, the NR V2X system and the LTE V2X system can be different V2X systems.

[0118] The following describes a method for satisfying the low latency and high reliability required in the NR SL based on the NR V2X system. However, the same or similar composition can be extended and applied to the LTE V2X system, and includes but is not limited to the following examples. That is, in the LTE V2X system, the present disclosure can be applied to the interactive part.

[0119] Here, the NR V2X capability may not be limited to basically supporting only V2X services, and the V2X RAT to be used may be selected.

[0120] In addition, new service requirements for public safety and commercial use cases of NR V2X services may be further considered. For example, the use cases may include, but are not limited to, at least one of the following: more advanced V2X services, public safety services, network control interactive services (NCIS), railway gap analysis (MONASTERYEND), enhanced relay for energy efficient and extensive coverage (REFEC), and audio-visual service production (AVPROD) certification.

[0121] Physical channels, signals, basic time slot structures and physical resources may be configured for NR V2X. Here, the NR physical SL shared channel (NR PSSCH) may be a physical layer NR SL data channel. V2X UEs may exchange data and control information (e.g., 2nd SCI, CSI) through the NR PSSCH. The NR physical SL control channel (NR PSCCH) may be a physical layer NR SL control channel. NRPSCCH refers to a channel for sending scheduling information of the NR SL data channel and control information (1st SL control information (SCI)) including the 2nd SCI indication. That is, the V2X UE may send control information for SL data communication to another V2X UE through the PSCCH. The NR physical SL feedback channel (NR PSFCH) refers to a channel for sending physical layer NR hybrid automatic repeat request (HARQ) feedback information and a channel for sending HARQ-ACK feedback information corresponding to the NR SL data channel (i.e., PSSCH). A V2X UE may send data to another V2X UE and may then receive HARQ feedback information of the corresponding data through the NR PSFCH. NRSL synchronization signal / physical SL broadcast channel (SLSS / PSBCH) block refers to a channel block that sends NR SL synchronization signal and broadcast channel in a single continuous time. Here, SLSS / PSBCH blocks can be periodically sent based on a set of one or more block indexes to support beam-based transmission in the NR band. The synchronization signal includes a primary SL synchronization signal (PSSS) and a secondary SL synchronization signal (SSSS). The synchronization signal is generated based on at least one SLSSID value. NR physical SL broadcast channel (PSBCH) refers to a channel used to send system information required to perform V2X SL communication. NR PSBCH is sent together with SLSS and is periodically sent based on a set of SLS / PSBCH block indices to support beam-based transmission.

[0122] In addition, PSCCH and PSSCH may be defined to support NR V2X. A UE may send SCI to another UE via PSCCH. Here, a Tx UE may send a first SCI (1st SCI, SCI format 1-A) to an Rx UE via PSCCH. The 1st SCI may be used to schedule PSSCH and auxiliary SCI (2nd SCI) within the PSSCH, and the 1st SCI may include priority information, time / frequency resource allocation information, resource reservation information, demodulation reference signal (DMRS) mode information, 2nd SCI format indicator information, 2nd beta-offset indicator information as a parameter for SCI and PSSCH rate matching operation, DMRS port count information, modulation and coding scheme (MCS) information, additional MCS table indicator information (e.g., indicating 64QAM, or 256OAM or one of the URMCSLLC tables), PSFCH overhead indicator information (a parameter for PSSCH rate matching operation with the 2nd SCI), and at least one reserved bit.

[0123] Figure 3 The NR SL time slot structure to which the present disclosure can be applied is shown.

[0124] refer to Figure 3 , a single SL slot (SL slot) includes a single automatic gain control (AGC) symbol. Moreover, a single SL slot includes a single Tx-Rx switching symbol. In a single SL slot, the PSSCH is a channel through which data is transmitted, which is transmitted through at least one subchannel (e.g., Figure 3 In addition, in the time domain, the PSCCH (1st SCI), the 2nd SCI, the PSSCH (data), and the demodulation RS (DMRS) for demodulation may be transmitted to the remaining OFDM symbols except the AGC symbol and the Tx-Rx switching symbol. In detail, the positions of the PSCCH (1st SCI), the 2nd SCI, the PSSCH (data), and the DMRS for demodulation may be the same as Figure 3 The same as in, but not limited to this. For example, in Figure 3 In the example, the PSCCH and the second SCI exist in the first subchannel, and considering this, the PSSCH and the DMRS can be allocated. As another example, the second subchannel refers to a subchannel in which the PSCCH and the second SCI do not exist, and the PSSCH and the DMRS can be allocated as follows: Figure 3 is allocated as in.

[0125] Here, the number of PSSCH DMRS can be configured according to the higher layer configuration, and one or more PSSCH DMRS can be configured according to the channel environment of the UE. PSCCH (1st SCI) uses the DMRS of PSCCH (ie, PSCCH DMRS) for reception and demodulation, and every four resource elements (REs) are equally allocated and transmitted within a single resource block (RB). In contrast, PSSCH DMRS is used to decode the 2nd SCI.

[0126] In addition, for example, a single resource pool associated with NR SL can support frequency division multiplexing (FDM), time division multiplexing (TDM), and space division multiplexing (SDM). This means that each resource in a single resource pool can be divided and used based on frequency, time, and space, which can improve resource efficiency.

[0127] Figure 4 NR SL frequencies to which the present disclosure can be applied are shown. For example, NR SL can operate based on at least one of the following: frequency range 1 (FR1) (below 6 GHz) and frequency range 2 (FR2) (i.e., up to 52.6 GHz), unlicensed ITS bands, and licensed bands. In detail, for example, refer to Figure 4 , 5,855 to 5,925 MHz can be allocated for ITS services (technology neutral manner).

[0128] In addition, NR V2X quality of service (QoS) requirements may be considered. That is, latency, reliability, and data rate may need to be met by predetermined conditions related to the requirements of the NR V2X service. Here, these requirements may be configured as shown in Table 6 below, and Table 7 may show PC5 QoS for NR V2X.

[0129] Here, in order to meet the QoS requirements, access stratum (AS) level QoS management may be required. To this end, HARQ and CSI feedback associated with link adaptation may be required. In addition, each of the NR V2X UEs may have a different maximum bandwidth capability (maximum BW capability). Taking this into account, AS-level information may be exchanged between NR V2X UEs, the AS-level information including at least one of the following: UE capabilities, QoS related information, radio bearer configuration, and physical layer configuration.

[0130] [Table 6]

[0131]

[0132] [Table 7]

[0133] NOTE 1: For standardized PQI to QoS characteristics mapping, this table may be extended / updated to support service requirements of other identified V2X services. Note 2: PQI can be used for services other than V2X.

[0135] In the following, the SL HARQ process is described. Whether the V2X UE is to report HARQ feedback is indicated by a higher layer (e.g., RRC) configuration and SCI signaling (e.g., 2nd SCI). For example, if the V2X UE performs SL communication based on multicast, it can be determined whether to report HARQ feedback based on the distance between the Tx UE and the Rx UE.

[0136] When the V2X UE performs at least one of unicast and multicast transmission, SL HARQ feedback may be enabled or disabled. Here, enabling / disabling HARQ feedback may be determined based on at least one of channel conditions (e.g., RSRP), the distance between the Tx UE and the Rx UE, and QoS requirements.

[0137] In the case of multicast, whether to send HARQ feedback can be determined based on the physical distance between the Tx UE and the Rx UE. Here, when HARQ feedback is performed for multicast transmission via PSSCH, the Rx UE can send a negative response only when the received PSSCH decoding fails. It can be referred to as Option 1 operation. In addition, when HARQ feedback is performed for multicast transmission via PSSCH, the Rx UE can feedback a positive response or a negative response based on whether the PSSCH decoding is successful, and this can be referred to as Option 2 operation. In Option 1 operation where only a negative response is fed back as only NACK HARQ feedback, if the physical distance between the Tx UE and the Rx UE is less than or equal to the communication range requirement, HARQ feedback corresponding to PSSCH reception can be performed. On the contrary, if the physical distance between the Tx UE and the Rx UE is greater than the communication range requirement, the V2X UE may not perform HARQ feedback corresponding to PSSCH reception.

[0138] Here, the location of the Tx UE is indicated to the Rx UE through SCI signaling associated with the PSSCH. The Rx UE may estimate the distance from the Tx UE based on both the information fragment included in the received SCI and its location information, and may operate as described above.

[0139] In addition, when unicast communication is performed based on V2X, the case where SL HARQ feedback is enabled can be considered. The Rx UE can generate and send HARQ ACK / NACK corresponding to the PSSCH according to whether the decoding of the corresponding transport block (TB) is successful.

[0140] Then, the NR SL resource allocation mode refers to a mode in which the base station schedules SL transmission resources. Here, the mode in which the base station schedules SL transmission resources may be mode 1. For example, when the V2X UE is within the coverage of the base station, the V2X UE may receive SL resource information from the base station. On the contrary, there is a mode in which the V2X UE directly determines the resources for SL transmission on the SL resources configured by the base station / network or the pre-configured SL resources. Here, the mode in which the UE directly determines the SL transmission resources may be mode 2.

[0141] In addition, a digital parameter configuration and waveform for the side link may be considered, which may be as shown in Table 8 below. In detail, regarding PSSCH / PSCCH and PSFCH in the side link, the SCS and CP length supported in each of FR1 and FR2 may be as shown in Table 8 below. Here, the waveform may support only OFDM without supporting DFT-S-OFDM, but may not be limited thereto. A side link synchronization signal block (SL-SSB) may be independently defined for each frequency range, which may be similar to NR-Uu.

[0142] [Table 8]

[0143]

[0145] Figure 5 The NR side link (SL) resource pool configuration is shown. Figure 5 , the resource pool may represent resources in time and frequency for sidelink transmission and reception. For example, at least one resource pool may be configured within a single SLBWP within a single carrier. Here, the resources of the resource pool may be configured based on the time resources of a time slot set unit and the frequency resources of a continuous subchannel set unit. In addition, the resource pool may be configured for each of transmission and reception.

[0146] In more detail, as a time resource for resource pool configuration provided in the NR side link, at least one of the following may be configured: a resource pool period (period), a side link time slot set (sl-TimeResource (length = L) within a single resource pool application period, bitmap)), and the first symbol and the number of consecutive symbols in a set of consecutive symbols within a single time slot. As frequency resources, at least one of the following can be configured: the bandwidth of at least one subchannel (for example, sl-SubchannelSize = {10, 15, 20, 25, 50, 75 and 100} RB), the entire bandwidth of the resource pool indicated by the number of consecutive subchannels (a set of consecutive subchannels (for example, sl-NumSubchannel = {1 to 27})), and the position of the first subchannel of the resource pool in the frequency domain (sl-StartRBsubChannel = {0 to 265}). For example, resources in the time domain and frequency domain can be configured based on higher layer parameters. In Figure 5 In the case where the total available RB resources do not completely match the subchannel size (i.e., if it does not reach the number of RBs constituting a single subchannel), the frequency resources corresponding to the excluded resource blocks (RBs) may indicate some remaining RBs. Here, the corresponding resources may not be used in the NR side link. In addition, for example, in the case where multiple units of the length of the bitmap on the time resource (e.g., sl-TimeResource) are not established and cannot be used as NR side link resources, the reserved time slots may indicate the remaining time slots.

[0147] Next, a case where an unlicensed band (unlicensed spectrum) is used for communication between a base station and a UE may be considered. For example, a communication scheme based on an unlicensed band may be a scheme in which communication is performed by competing for an occupied channel and based on the occupied channel. Even for communication between a base station and a UE, communication based on an unlicensed band may be performed. Below, operations based on a case in which an unlicensed band is used for sidelink communication are described. That is, even for sidelink communication as communication between UEs, an unlicensed band may be used. In addition, it is necessary to consider configuring a sidelink resource pool using a sidelink unlicensed band. In more detail, sidelink communication may be performed based on a resource pool. In the case of performing communication via an unlicensed band, the resource pool configuration needs to be configured differently.

[0148] For example, a resource pool for side link communication may be configured based on a time slot unit, and symbols that can be used for the side link within a time slot may be determined, which is similar to Figure 5 In addition, as mentioned above, Figure 5 As described, in the frequency domain, it can be configured based on the number of consecutive subchannels. The above sidelink resource pool configuration can be configured in consideration of unlicensed band communications, which will be described below.

[0149] Figure 6The unlicensed frequency band of each area of ​​NR side link communication to which the present disclosure is applicable is shown. In the above Table 8, the frequency range of NR FR1 may be from 450 MHz to 6 GHz, but the corresponding frequency range may vary from 450 MHz to 7.125 GHz. The frequency range of NR FR1 may be changed for the unlicensed frequency band of the 6 GHz band, but may not be limited thereto.

[0150] For example, the unlicensed frequency band may be located below 1 GHz, 2.4 GHz, 5 GHz, 6 GHz, 37 GHz (US only), and 60 GHz, but may not be limited thereto. Figure 6 For example, in the system, the 5 GHz band may be Band 46 defined as 5150 to 5925 MHz. In addition, for example, for LAA operation, Band 49 (3550-3700 MHz) may be defined as Citizens Broadband Radio Service (CBRS), but is not limited thereto.

[0151] Figure 7 The use of the 5 GHz unlicensed frequency band to which the present disclosure can be applied is shown. Figure 7 , each frequency band within the 5GHz unlicensed frequency band can be set, and based on this, the use of the unlicensed frequency band can be set. For example, it can be divided into 20MHz units, and each 20MHz can be a single channel.

[0152] Here, the low frequency band of 5150 to 5350 MHz within the above frequency band is specified in most areas to have a maximum transmission power of 23 dBm for indoor use. Also, in the frequency band of 5470 MHz or higher, it is used in areas with a transmission power of up to 30 dBm, and is used for outdoor use in most areas. Here, for example, there may be additional requirements in some areas, which are given as effective isotropic radiated power (EIRP) values ​​based on the following Table 9, and the maximum transmission power is limited.

[0153] [Table 9]

[0154]

[0156] Here, the power spectral density (PSD) may indicate that the device is limited to performing full power transmission within the reference bandwidth. As a detailed example, European regulations may limit the PSD to 10dBm / MHz. Therefore, in a non-20MHz bandwidth, the device may not perform transmission at the maximum transmit power of 23dBm.

[0157] Figure 8 The present disclosure is applicable to increase the bandwidth by taking into account the PSD limitation. Figure 8As shown, a small data transmission situation that only requires a small bandwidth can be considered. Here, in the case of performing small data transmission through a wide bandwidth, the coverage can be extended. In addition, the minimum bandwidth occupancy control can be satisfied by transmission with the help of a wide bandwidth. In view of this, for small data, a method of performing transmission in a wide bandwidth may be preferred.

[0158] In addition, for example, in the case of occupying a channel through a channel access process in an unlicensed band, a maximum channel occupancy time (COT) corresponding to the maximum allowable occupation time may be set differently for each region. For example, Japan allows a maximum COT of up to 4 ms, while Europe allows a maximum COT of up to 8 ms or 10 ms. However, this is merely an example and is not limited to the above embodiments. In addition, for example, Europe may support framework base equipment (FBE) and load base equipment (LBE) rules. Here, FBE may be set to high performance radio (LAN HiperLAN) / 2, and LBE may be adopted and applied according to Wi-Fi standard specifications, and both may be supported in NR as a new communication system.

[0159] In addition, for example, the minimum occupied bandwidth may be a bandwidth control that requires minimum occupancy when channel access is successful once. For example, the minimum occupied bandwidth control may be configured to occupy 80% to 90% or more of the nominal channel BW. As a detailed example, when the UE transmits a PUSCH to the base station in an unlicensed band, it may request that resources for the PUSCH be allocated in an interleaved form in a specific bandwidth, but may not be limited to the corresponding embodiments.

[0160] In addition, regulation on dynamic frequency selection may be regulation that limits bandwidth usage for the purpose of protecting a system (e.g., radio) with a high priority for using an unlicensed band. In addition, transmit power control regulation may be regulation that limits transmit power to a value much lower than the maximum transmit power value allowed for use. In addition, listen-before-talk (LBT) regulation may be regulation on a channel access procedure, and Europe may support FBE and LBE rules. Here, FBE may be Hiperlan / 2, and LBE may be adopted and applied from Wi-Fi standard specifications, and both may be supported in NR.

[0161] In addition, for example, the 5 GHz unlicensed band can be used based on the above description, but the use of the 6 GHz band is being discussed in each country and organization. Here, the 6 GHz band may be a band that is different from 5 GHz and is not used in a mobile system. That is, unlike the 5 GHz band shared by multiple mobile communication systems, the 6 GHz band can be used for a single designated communication system. Therefore, problems or inefficiencies caused by the coexistence of different systems can be reduced.

[0162] Fig. 9 A method of configuring a guard band in consideration of a shared frequency band (eg, an unlicensed frequency band) within a cell, to which the present disclosure may be applied, is shown.

[0163] Reference Fig. 9 To support broadband operation in shared spectrum access, the UE may receive the IntraCellGuardBandsPerSCS parameter for each of the UL carrier and the DL carrier from the base station based on the base station configuration. N subcarriers may be provided to the UE in a single carrier (subcarrier spacing index = μ). RB-set,x -1 cell protection band. Fig. 9 , the UE may receive higher layer signaling for the number of common resource blocks (CRBs) for each guard band and the starting CRB. For example, a CRB may be a resource block defined / configured based on point A, which is the starting position of the transmission bandwidth in the carrier in the frequency domain. The UE may verify the information about point A through base station signaling, and based on this, may identify the CRB position in the frequency domain. Here, each guard band may be based on The parameter is defined as the starting CRB, and in each guard band, the number of CRBs can be based on The UE may receive the aforementioned information through higher layer signaling based on each of the startCRB and nrofCRB parameters. Here, s∈{0,1,…,N RB-set,x -2}, N RB-set,x N represents the number of RB sets, and x can be configured as DL or UL for downlink and uplink. RB-set,x The RB sets may be configured as a resource block set (RBS) within a single carrier through a guard band configuration. For example, the guard band may be configured based on an IntraCellGuardBandsPerSCS parameter, and the RBS may be configured within a single carrier accordingly.

[0164] Here, each RBS frequency bandwidth may correspond to an LBT frequency bandwidth. That is, each RBS may be set to a bandwidth corresponding to the LBT process performed by the base station and the UE. Fig. 9In the example, if LBT is successful in the corresponding area corresponding to the LBT bandwidth, RB set 1 911 and RB set 2 912 may occupy the corresponding frequency band and may perform communication. That is, the RBS may correspond to the LBT bandwidth. For example, a Tx node (e.g., a gNB or a UE) may determine the channel occupancy of the unlicensed band by performing an LBT channel access procedure on an RBS resource corresponding to the LTE bandwidth. When the LBT procedure is successful in a single RBS, the Tx node may perform transmission on the resources corresponding to the RBS.

[0165] Here, each RBS can be defined as a start CRB and an end CRB. The start CRB can be End CRB can be Here, the size of the guard band 913 may be nrofCRB. For example, according to the subcarrier spacing μ and the carrier size It may not be desirable to set the size nrofCRB of guard band 913 to a size smaller than the number of applicable intra-cell guard bands defined in consideration of requirements regarding interference status of a wireless bandwidth.

[0166] Here, the start CRB and the end CRB of each RBS (911, 912) may be determined based on the RBS index, and the RBS index may be s∈{0,1,...,N RB-set,x -1}. That is, the RBS index s can be resource blocks of size, and represents the number of CRBs determined by the start CRB and the end CRB based on the following Equation 3. Also, in each RBS, the start CRB and the end CRB may be as shown in the following Equations 4 and 5.

[0167] [Equation 3]

[0168]

[0169] [Equation 4]

[0170]

[0171] [Equation 5]

[0172]

[0174] For example, if the UE is not provided with the IntraCellGuardBandsPerSCS parameter configuration, the UE can determine the carrier μ and carrier size based on the requirements of the RF standard. In addition, for example, if the above nominal intra-cell guard band and RBS pattern do not include an intra-cell guard band, it can be assumed that the RBS of the corresponding carrier is 1.

[0175] For example, in Fig. 9 In the embodiment, two LBT BWs (RBS 0, RBS 1) can be configured in a single BWP 922 within a single carrier bandwidth. Here, a single guard band 913 can be configured between the two RBSs 911 and 913. The location of each of the two RBSs 911 and 913 can be as follows: Fig. 9 As shown, it is determined based on the above-mentioned higher layer parameters. In addition, for example, when multiple BWPs 921 and 923 are configured within a single carrier bandwidth, the RBS associated with each BWP can be verified. Here, the RBSs corresponding to the first RBS (= s0, 912) and the last RBS (= s1, 911) of each BWP in the RBSs 911 and 912 within the carrier can be indexed by s0 and s1 indexes.

[0176] Fig.10 An interleaving-based RB resource assignment method applied to the present disclosure is shown. PUCCH / PUSCH transmission can be performed by RB resources allocated based on interleaving. Here, the reference point of the RB resources allocated based on interleaving can be point A1010. The UE can obtain information about point A 1010 through base station signaling, as described above. In addition, a common resource block (CRB) can be a resource block defined / configured based on point A 1010 as a starting position point of the transmission bandwidth on the carrier. That is, when physical uplink control channel (PUCCH) / physical uplink shared channel (PUSCH) transmission is performed using interleaving-based RB resources, all interleavings can be used based on the same configuration on the carrier based on reference point A 1010 and CRB. For example, as described above, an existing wireless communication system (e.g., LTE LAA) and a wireless communication system (e.g., NR) can perform PUCCH / PUSCH transmission using interleaving-based RB resources, but may not be limited thereto.

[0177] For example, in the case of a 15kHz SCS, an interleave of M=10 may be defined for the entire bandwidth. In the case of a 30kHz SCS, an interleave of M=5 may be defined for the entire bandwidth. In addition, X bits may be provided for interleave assignments via signaling associated with frequency resource assignments. As a detailed example, if X=5 for a 30kHz SCS, then X bits may indicate all possible interleave combinations. As another example, if X=6 for a 15kHz SCS, then X bits may indicate a starting interleave index and a number of consecutive interleaves. For example, based on a combination of a starting interleave index and a number of consecutive interleaves, a value of 55 may be required. Therefore, when indicated with 6 bits, there may be 9 remaining RIV values, and the 9 remaining RIV values ​​may indicate a specific predefined interleave combination.

[0178] In addition, through the signaling related to the frequency resource assignment, Y bits can be provided for the RB set assignment. The RB set assignment can be a start and end RB set based on the RIV format. Here, the RB set can be continuous at all times. In addition, for example, when two adjacent RB sets are assigned, a guard band between the RB sets can also be assigned, and the guard band can be used as a frequency resource.

[0179] In addition, for example, a method may be required to fairly access and use channels between various wireless access technologies / systems (e.g., Wi-Fi, LAA, NR-U, etc.) in unlicensed bands. For example, channel access rules (e.g., ETSI rules) based on the above-mentioned 5 GHz and 6 GHz bands may be provided, and matters as shown in Table 10 below may be specified, but may not be limited thereto.

[0180] [Table 10]

[0181]

[0182] Here, as a channel access method based on Table 10, frame-based equipment (FBE) and load-based equipment (LBE) rules may be supported. For example, the LBE access rule may consider the factors of Table 11 below. Channel access may be performed by determining the channel occupancy state based on a clear channel assessment (CCA) measurement. In addition, transmission based on an occupied channel may be performed after determining a transmit power based on channel occupancy.

[0183] [Table 11]

[0184]

[0186] Channel access priority classes (CAPCs) may be set for channel access, which may be shown in Table 12. Here, priority classes may specify priorities based on specific traffic types and quality of service (QoS) requirements. For example, in Table 12, four priority classes may be defined. Here, different priority counter (p) values ​​may be specified for each priority. Here, the higher the priority class, the lower the priority counter value may be.

[0187] In addition, for example, the channel occupancy time (COT) can be the transmission burst duration. Here, the maximum COT limit can be determined differently for each different priority class. A higher priority class can have a shorter maximum COT duration. That is, a higher priority class can have a lower priority counter value and a shorter maximum COT duration.

[0188] In addition, for example, the contention window (CW) may be a window for selecting a counter value to perform a backoff procedure for channel access. Here, the contention window may be different for each priority class, which may be shown in Table 12 below.

[0189] [Table 12]

[0190]

[0192] Fig.11 A method for performing a listen-before-talk (LBT) process in an unlicensed band to which the present disclosure can be applied is shown. For example, based on the aforementioned LBE, a type 1 LBT process (LBT category 4) can be considered. The LBT process can be set based on category 1 to category 4, which will be described below. Fig.11 , the Tx node may wait to verify whether the channel is available for a defer period (defer period) (S1110). Here, the defer period may be determined based on the priority category of Table 13 below. For example, the defer period may measure whether the channel is available for at least 25 μs. Here, it may be considered to send feedback information about data transmission within a maximum of 16 μs. In view of the above, the defer period may measure whether the channel is available for at least 25 μs.

[0193] When it is determined that the channel is available during the postponement period, the corresponding node may perform a backoff process. Here, the backoff counter N may be initialized to a random value between 0 and the CW value (S1120). That is, a random value between 0 and the CW value may be used as a backoff counter. Here, whether the channel is available may be counted based on a 9 μs time slot, and as many backoffs as the backoff counter value may be performed. Here, a larger backoff value may be set based on a larger contention window, and the probability of conflict may be reduced accordingly.

[0194] Then, it can be determined whether the backoff counter value is 0 (S1130). If the backoff counter value is 0, the corresponding node can perform the transmission. The corresponding node can use the channel based on the priority of the transmission until the maximum COT allowed for occupancy. On the contrary, if the backoff counter value is not 0, the backoff counter value can be decremented, i.e., reduced (S1140). Then, it can be determined whether the channel is idle in the next 9μs time slot (S1150). Here, if the channel is idle in the 9μs time slot, it can be verified again whether the backoff counter value is 0. If the backoff counter value is not 0, the operation of reducing the backoff counter value can be repeated. Thus, if the backoff counter value becomes 0, the above-mentioned transmission can be performed.

[0195] On the contrary, if the channel is not idle in the 9 μs time slot, the corresponding node may wait again for the amount of time corresponding to the postponement period, and then verify whether the channel is available based on the backoff counter value (S1160). Based on the above, the corresponding node may occupy the unlicensed band, and may perform transmission. In addition, for example, the postponement period of the downlink / uplink based on the priority class, the possible contention value, and the maximum COT may be as shown in Table 13 below.

[0196] [Table 13]

[0197]

[0199] Here, for example, the contention window size can be adjusted based on HARQ feedback. In detail, if the HARQ feedback received for the first transmission performed by the corresponding node within the COT is NACK, the contention window size can be doubled in consideration of retransmission. On the contrary, if the HARQ feedback received for each transmission is ACK, the contention window size can be reset to the CW minimum value. Here, adjusting the contention window size by the first transmission within the COT may result in a conflict in the first transmission after the node occupies the channel. In the above case, it is necessary to update the contention window size. On the other hand, based on a poor channel environment or other reasons for non-conflict occurrence, it is likely that a NACK will be received for a transmission after the first transmission within the COT. Therefore, as described above, the contention window size can be adjusted based on feedback from the first transmission within the COT.

[0200] As another example, contention window adjustment for downlink (DL) / uplink (UL) transmission based on the configured grant may be performed based on feedback information in the downlink / feedback information in the uplink, respectively. In addition, for example, when there is no downlink feedback transmission in the uplink transmission based on the uplink grant, contention window adjustment may be performed by a new data indicator (NDI), but is not limited to a specific embodiment.

[0201] In addition, for example, an energy detection (ED) threshold (TL) can be determined based on parameters, channel bandwidth, and other values. As another example, the ED threshold may be determined based on whether the carrier frequency is shared with other wireless access technologies (e.g., WiFi) or whether the installation method ensures that only a specific wireless communication system (e.g., NR) is used. As a detailed example, in a 5GHz band coexisting with other systems, for a 20MHz carrier, the maximum threshold may be set to -72dBm. Here, -72dBm may be a value determined by comparison with other wireless communication systems (e.g., WiFi systems), but may not be limited to a specific embodiment. As another example, if only a specific wireless communication system (e.g., NR) uses the carrier frequency, then, for a 20MHz carrier, the maximum threshold may be used as -62dBm, and the threshold for uplink transmission may be set by RRC signaling, but may not be limited to a specific embodiment.

[0202] Then, Fig.12 COT sharing and discovery burst transmission applied to the present disclosure are shown. Fig.12 , in the case of an occupied channel, the above-mentioned type 1 LBT process, transmission can be performed within the COT. Here, type 2 transmission can have three options based on the gap portion within the COT, which can be shown in Table 14 below. For example, type 2A (LBT cat 2) transmission can set the COT gap to 25μs or more, and it can be used to discover burst transmissions. For example, type 2A may be considered for SSB transmission, but is not limited to this. As another example, type 2B transmission may be a type that applies a COT gap of 16μs. In addition, type 2C transmission may be a type that applies a COT gap of 16μs or less. For example, if the next transmission is at most 16μs, idle sensing may not be required and type 2C may be applied.

[0203] [Table 14]

[0204]

[0206] Here, for the aforementioned COT sharing, the gap may be smaller than the OFDM symbol interval. This is because the resource assignment method based on OFDM symbols may not be sufficient, and a method for indicating CP extension may be applied by considering the above problem. That is, it may be indicated to extend the CP faster than the OFDM symbol boundary, and one of the following Table 15 may be indicated.

[0207] [Table 15]

[0208]

[0210] For example, Fig.13 A method of applying CP extension to an uplink when COT sharing is performed between a downlink and an uplink, which is applicable to the present disclosure, is shown. Fig.13 A case is shown where C2 is set to 1 based on COT sharing with a 16 μs gap, but this is not limited thereto. Fig.13 , the TA value may be considered to ensure a 16 μs gap between downlink and uplink in the base station. For example, the C value may be set by RRC signaling. In addition, the CP extension for uplink transmission may be indicated in the uplink grant.

[0211] As another example, a case where channel access is performed based on the FBE method can be considered. The FBE method can be a channel occupation method applicable to an area (e.g., a specific building, a factory) where no other system is ensured by rules. Here, in the case where channel access is performed based on the FBE method, transmission can be started at a specific time point. As a detailed example, Fig.14 The semi-static channel access process applicable to the present disclosure is shown. Fig.14 , a single COT may start once every Tx ms. Here, a channel may be occupied when the channel is idle for at least 9 μs before the COT. Here, Tx ms may be set to one of 1 ms to 10 ms values. Also, the gap may be at least 5% of Tx. Here, COT sharing may be used in a similar manner to LBE, and the gap may be at most 16 μs.

[0212] For example, Fig.15 A method for performing channel occupation applicable to the present disclosure is shown. Fig.15 , before performing transmission in the operating channel, the device may perform a CCA check in a CCA observation period of not less than 20 μs based on energy detection. In addition, for example, in the case of sending a control frame (e.g., ACK, block ACK) in consideration of multicast, the CCA process may be skipped, and transmission may be performed immediately after receiving the packet. That is, the UE may perform control frame transmission without a new CCA process, but this will not exceed the maximum COT.

[0213] For example, when the device sends an ACK / NACK signal after receiving data, the device can skip CCA, but this needs to be within the maximum COT. In addition, for example, sending a signal with a maximum duty cycle within 5% of 50ms as an observation period through short control signaling can be performed without CCA, but it may not be limited to a specific form.

[0214] Likewise, for example, LBT categories may be considered. The LBT categories may consider the following categories: Category 1 where transmission is performed immediately after a short switching gap, Category 2 where LBT is performed without random backoff, Category 3 where a fixed-sized contention window and random backoff are performed, and Category 4 where a variable-sized contention window and random backoff are performed.

[0215] In detail, Category 1 may be a method of performing transmission immediately after a short switching gap. Here, Category 1 may be used to perform transmission immediately after a switching gap within one COT. The switching gap from reception to transmission within one COT may include the switching time of the transceiver and may be no longer than 16 μs. In addition, for example, Category 2 may be an operation of performing LBT without random backoff. For example, in the case of performing LBT, Category 2 may be a method of performing an initial CCA, and if the channel is idle, occupying the channel and sending data in an unlicensed channel. Here, random backoff counting may not be performed. On the other hand, Category 3 may be an LBT method in which random backoff is performed using a contention window of a fixed size. As a case of performing LBT based on Category 3, if the channel is idle by performing an initial CCA, a fixed contention window (e.g., a fixed "q" value, where q represents a value that determines the contention window size of a random N counter selected between 0 and q) may be used to perform random backoff. For example, the random backoff operation allows a randomly selected counter value within the contention window to occupy the channel when the value is zero by decrementing the count depending on whether the channel is idle for each enhanced clear channel assessment (ECCA) slot.

[0216] As another example, category 4 may be an LBT method in which random backoff is performed with a contention window of variable size. Category 4 may be different from category 3 because category 4 has a variable contention window. On the other hand, the operation of occupying a channel by applying an N value based on a random backoff value may be the same. That is, category 4 may be the same as category 3, except that the contention window size may be different based on time or event compared to category 3, and may be used in multiple wireless communication systems (e.g., LAA, NR-U, WiFi), but is not limited to a specific embodiment. Here, for example, different channel access categories (e.g., LBT categories) may be defined and used for transmission of other channels / signals within one COT. In addition, for example, in a new wireless communication system (e.g., NR-U), category 4 LBT and category 2 may be used in the COT, which may be as shown in Table 16 below. In addition, in the absence of unicast transmission and the transmission is characterized by limited transmission with transmission within 1 ms or less and its duty cycle is 5% or less, category 2 LBT may be used to discover burst transmissions, but may not be limited to a specific form.

[0217] [Table 16]

[0218]

[0220] Hereinafter, a method for assigning frequency resources is described so that the side link communication (e.g., NR) of a wireless communication system can operate in an unlicensed band. For example, currently, based on SCS, the size of the RB set included in 20MHz in the unlicensed band (e.g., NR-U) of the wireless communication system may be different. For example, for a 15kHz SCS, the size of the RB set may be 100 to 110 PRBs. In addition, for a 30kHz SCS, the size of the RB set may be 50 to 55 PRBs. Here, for example, in the case of assigning interleaving-based RB resources, some interleavings may include 11 PRBs, but the remaining interleavings may include only 10 PRBs.

[0221] Here, for example, a case where the size of the subchannel is changed to use the entire bandwidth in the side link can be considered. That is, a case where the number of PRBs included in each subchannel is set differently can be considered. However, in the case where different subchannel sizes are set, if retransmission is performed after the initial transmission of a TB with the same transport block size (TBS), it may be difficult to guarantee the transmission. In view of the above, the subchannel size (i.e., the number of PRBs) in each subchannel may be set to the same, but may not be limited thereto. However, if the subchannel size is set to the same in each subchannel, some subchannels may not be used in a single interleaving based on the interleaved RB resource configuration.

[0222] Here, for example, Fig.16 A method for setting an RBS in a resource pool and a BWP in a side link unlicensed band to which the present disclosure can be applied is shown. The frequency domain resource structure of a wireless communication system of a side link unlicensed band (e.g., NR SL-U) can consider a bandwidth part (BWP), a resource pool (RP), an interleaved RB, and an RBS (RB set). Here, the RBS can be considered even in a wireless communication system of an unlicensed band (e.g., NR U), and it is not limited to a specific embodiment.

[0223] refer to Fig.16, a single sidelink unlicensed band (SL-U) BWP 1610 may be configured in the sidelink UE, a single SL-U RP 1620 may be configured in the SL-U BWP 1610, and two RBSs 1631 and 1632 may be configured in the SL-U RP 1620. However, this is merely an example for describing clarity and is not limited to the above embodiments. Here, for example, in the SL-U system, an interleaving structure may be considered to meet the OCB and PSD requirements required in the unlicensed band. That is, in the SL-U system, a sidelink interleaving structure may be implemented by performing CRB indexing based on point A which is a reference frequency point of a single carrier. Fig.16 In the example, the frequency domain corresponding to CBR index 47 to CRB index 90 may be configured as SL-U BWP 1610 based on the configuration of SL-U BWP 1610, and the frequency resources including two RBSs 1631 and 1632 may be configured based on the configuration of SL-URP 1620, but this is only an example and may not be limited thereto. Fig.16 The frequency domain resource configuration method of the SL-U system and the resource assignment method for actual SL-U data transmission based on the method are shown.

[0224] For example, in the channel access process of the sidelink unlicensed band wireless communication system (e.g., NR SL-U), the above-mentioned type 1 channel access process and type 2 channel access process can be applied. In addition, for example, UE-to-UE COT sharing can be applied to UEs operating in the sidelink unlicensed band. That is, a single Tx UE can share a portion of the unlicensed resources acquired through the LBT process with an Rx UE or another UE.

[0225] For example, as in the existing sidelink wireless communication system (NR SL), frequency resources can be configured based on subchannels in a wireless communication system (e.g., NR SL-U) of a sidelink unlicensed band. That is, the term "subchannel" can be used even in NR SL-U, as in NR SL. However, the name of the subchannel may be configured differently in a wireless communication system (e.g., NR SL-U) of a sidelink unlicensed band and is not limited to a specific embodiment. For clarity of description, the following description is based on subchannels.

[0226] For example, a single interleaving-based RB structure that meets the above-mentioned unlicensed band requirements can be defined as M RBs in the frequency domain. Here, the interleaving-based RB structure can be defined as RBs with intervals corresponding to a uniform number of RBs. As another example, the interleaving-based RB structure can be configured using RBs with intervals corresponding to a non-uniform number of RBs, and is not limited to a specific embodiment.

[0227] Here, the interleaving-based RB structure can be pre-configured for the NR SL UE in a cell-specific or carrier-specific manner based on the configuration based on the bandwidth / digital parameters. As another example, the interleaving-based RB structure can be specifically configured in the physical link between the UEs through a higher layer configuration, and is not limited to a specific embodiment. Here, the interleaving-based RB structure can be applied to all interleavings regardless of the carrier bandwidth. Therefore, the interleaving-based RB structure can be configured based on the CRB defined based on point A, where point A is a specific reference point in the frequency domain. Here, a single subchannel can be defined as being pre-configured with k interleavings. As another example, a single subchannel can be configured with k interleavings through higher layer signaling. K can be the number of interleavings for each subchannel. The number of interleavings for each subchannel can have a fractional (or decimal value) or an integer value, which will be described below. In addition, for example, when multiple RBSs are configured within a single SL BWP, the frequency resource assignment indication may include RBS assignment information and RB frequency resource assignment information based on subchannels or interleavings.

[0228] As another example, resource assignment can be performed based on an interleaved RB unit rather than a "subchannel" unit in a sidelink unlicensed band system (e.g., NR SL-U). Here, the frequency resource assignment unit can be based on an interleaved RB unit rather than an existing subchannel, but this is merely an example and is not limited to a specific embodiment.

[0229] In the following, both the subchannel unit and the interleaving-based RB unit can be considered as a resource allocation unit in the frequency domain. Here, the subchannel can be configured with k interleavings or can be configured with a number of continuous RBs. However, in the following, for the sake of clarity of description, the "subchannel unit" based on the interleaving structure is described as a unit of frequency resource assignment. However, by applying the proposed method, frequency resource assignment can also be configured using an interleaving-based RB unit instead of a subchannel unit, and is not limited to a specific form.

[0230] Here, for example, Fig.17 The present disclosure is applicable to a method for configuring a side link unlicensed band resource pool based on continuous frequency resources. Fig.17 , the side link unlicensed band resource pool 1710 may be configured based on continuous frequency resources. Here, the side link unlicensed band resource pool 1710 may be indicated using only the RBS index. Fig.17, the case where only a single RBS 1720 is configured in the sidelink unlicensed band resource pool 1710 while the LBT process of the unlicensed band is considered. Here, from the perspective of the frequency domain, the resource pool configuration of the sidelink unlicensed band can be indicated to the UE based on continuous frequency resources (hereinafter, case 1). For example, in order to meet requirements such as OCB and PSD in the aforementioned unlicensed band, most frequency resources (e.g., >80%) within at least one LBT BW (RBS 1720) can be configured as a single resource pool. In view of the above provisions, there may be limitations in at least one resource pool configuration of a single RBS within a single SL BWP. That is, only one resource pool can be configured to exist within a single RBS to include most frequency resources. In this way, the above provisions can be met. Here, for example, resources for actual transmission can be selected from a resource pool configured based on continuous frequency resources by assigning frequency resources based on interleaving, thereby performing sidelink transmission.

[0231] on the other hand, Fig.18 The side link unlicensed band resource pool configuration based on frequency resources using interleaved assignment to which the present disclosure can be applied is shown. Fig.18 In order to meet the regulations on frequency utilization in unlicensed bands, the resource pool can be configured using the interleaved RB-based subchannels or new interleaved RBs from the initial resource pool configuration phase. That is, the interleaved RBs or the interleaved RB-based subchannels can be used according to the resource pool configuration. For example, refer to Fig.18 , in the case of configuring a frequency resource-based sidelink unlicensed band resource pool using interlace assignment, the frequency resources used for the resource pool configuration may be indicated based on a combination of RBS and interlace / subchannel index (hereinafter, Case 2).

[0232] That is, in Fig.18 In order to meet the requirements such as the above-mentioned OCB and PSD, the resource pools 1821 and 1822 may be configured using the interleaved RB-based subchannels or interleaved RBs from the initial resource pool configuration phase. Therefore, the resource pools 1821 and 1822 of the sidelink unlicensed band may not have a continuous subchannel or PRB structure. That is, the resource pools 1821 and 1822 of the sidelink unlicensed band may be configured in non-contiguous PRBs based on the interleaved assignment, and the requirements such as the above-mentioned OCB and PSD may be met accordingly. In addition, compared with case 1 ( Fig.17 ), multiple resource pools of the side link unlicensed band can be configured in a single RBS, and therefore, flexibility in resource configuration can be provided.

[0233] Here, all resource pool configuration methods corresponding to the above-mentioned cases 1 and 2 may consider the frequency resource assignment method based on interleaving. However, there may be differences regarding whether to configure frequency resources using continuous frequency resources (which is similar to the existing NR SL) in the stage of configuring a single resource pool (case 1) or whether to configure non-contiguous resource pools from the resource pool configuration stage considering the interleaving structure (case 2). Below, the RBS-based sidelink unlicensed band resource pool configuration method is described based on the above content.

[0234] Fig.19 A side link unlicensed band resource pool configuration method applicable to the present disclosure is shown.

[0235] The sidelink unlicensed band resource pool can be configured based on the RBS. For example, the sidelink resource pool can be configured by the resource pool starting point and the number of subchannels within the resource pool based on consecutive subchannels. For example, as described above, even in the sidelink unlicensed band pool, the resource pool corresponding to the LBT BW can be configured by the resource pool starting point and the number of subchannels within the resource pool based on consecutive subchannels. The RBS configuration and index can be considered to effectively configure the sidelink unlicensed band resource pool. That is, the sidelink unlicensed band resource pool can configure a single resource pool by indicating the RBS configuration / index via resource pool configuration signaling.

[0236] As a detailed example, a single resource pool may include one RBS or one or more RBSs. Therefore, in the case of a specific resource pool, the frequency configuration for the resource pool may be performed by providing a continuous RBS index configuration associated with the specific resource pool. Here, in the case where the frequency configuration of the resource pool is performed based on a continuous RBS index configuration, the resource pool may utilize the gap band resources between the RBSs to maximize the frequency resource efficiency. Consider the case where four RBSs are configured within a single side link BWP. Here, since gap bands can be configured between each RBS, three gap bands can be configured and provided. Here, the resource pool of the side link unlicensed band may be configured by continuous RBS indexes based on the LBT BW. In detail, in a single resource pool configuration, the frequency domain resource configuration may be provided by RBS index information. For example, in a resource pool configuration, the frequency domain resource configuration may be provided by information about the starting RBS index and the number of continuous RBSs.

[0237] refer to Fig.19, in configuration 0 1910, the resource pool may be configured with four consecutive RBSs from RBS#0 to RBS#3. Here, configuration 0 1910 may indicate the resource pool configuration by indicating RBS#0 as the starting RBS index and 4 as the number of consecutive RBSs. As yet another example, in configuration 1 1920, as two consecutive RBSs, RBS#0 and RBS#1 may be configured as side link resource pool #0, and RBS#2 and RBS#3 may be configured as side link resource pool #1. Here, configuration 1 1920 may indicate the resource pool configuration by indicating RBS#0, RBS#2 as the starting RBS index and 2 as the number of consecutive RBSs for each resource pool. As yet another example, in configuration 2 1930, side link resource pool #0 may be configured in RBS #0, side link resource pool #1 may be configured in RBS #1, side link resource pool #2 may be configured in RBS #2, and side link resource pool #3 may be configured in RBS #3. Here, since each resource pool corresponds to each RBS, the corresponding RBS index and the number of RBSs 1 may be indicated. As yet another example, in configuration 3 1940, side link resource pool #0 may be configured in RBS #0, side link resource pool #1 may be configured in RBS #1 and RBS #2, and side link resource pool #2 may be configured in RBS #3. Here, the starting RBS index and the number of RBSs corresponding to each side link resource pool may be indicated, and through this, the configuration of each resource pool may be indicated. As yet another example, in configuration 4 1950, side link resource pool #0 may be configured in RBS #0, RBS #1, and RBS #2, and side link resource pool #1 may be configured in RBS #3. Here, the starting RBS index corresponding to each side link resource pool and the number of RBSs may be indicated, and through this, the configuration of each resource pool may be indicated. However, Fig.19 The resource pool configuration is merely an example and may not be limited to the above-described embodiments.

[0238] Here, for example, when a plurality of RBSs are configured in the SL BWP, frequency resource information of a resource pool configuration for a sidelink unlicensed band may be indicated to the UE through at least one of interlace / subchannel-based configuration information and RBS configuration information.

[0239] Here, when all interleaving / subchannel-based configuration information and RBS configuration information are provided, frequency resource configuration information for a single resource pool may be provided to the UE through frequency resource information. In addition, when an intra-cell guard band (GB) between consecutive RBSs is configured in a single resource pool, the frequency resources corresponding to the GB may be used as part of the resource pool for sidelink unlicensed band communications.

[0240] Below, the method for assigning frequency resources for sidelink unlicensed band data transmission and reception in the frequency domain is described above. The content described below can be applied to all the above-mentioned methods for configuring at least one of the interleaving / subchannel-based configuration information and RBS configuration information for the resource pool, and is not limited to a specific embodiment.

[0241] In addition, for example, the following matters may be applicable to the following two cases: a case where continuous frequency resources are configured as a single resource pool (case 1) and a case where the resource pool is configured based on discontinuous frequency resources (case 2). However, for the sake of clarity of description, the description is made based on the case where a single resource pool is configured based on continuous frequency resources (case 1), but it may even be interchangeably applied to the case where the resource pool is configured based on discontinuous frequency resources (case 2), and may not be limited to a specific form.

[0242] For example, the frequency resource configuration of the sidelink unlicensed band may be configured based on the starting subchannel information and the number of subchannels based on continuous frequency resources. In addition, the time resource configuration of the sidelink unlicensed band may be based on at least one of: SSB transmission slots, reserved slots, and TDD UL-DL configuration, and the resource pool may be configured by applying a bitmap between the remaining slots, and this may not be limited to a specific embodiment.

[0243] However, the following description is made based on the frequency resource configuration of the side link unlicensed band. For example, the indication of the side link resource set (SL RBS) index (i.e., the bit size) may be set in consideration of the total number of SL RBSs included in a single SL BWP. Here, the indication of the SL RBS index may indicate one or more SL RBS indexes. For example, the SL RBS may be configured continuously in the frequency domain, but may not be limited thereto. Here, for clarity of description, the following description is made based on the SL RBSs configured continuously in the frequency domain.

[0244] In addition, for example, frequency resource reservation can be indicated by a physical sidelink control channel (PSCCH). Here, frequency resource reservation indication can be performed in the second time slot or the second time slot / third time slot based on the PSCCH received within the lowest interleaving index among the interleaving indexes defined within the single carrier bandwidth. Based on the LBT BW considered in the unlicensed band, the interleaving structure can be set to 10 interleavings (ie, M=10) in a 15kHz SCS and can be set to 5 interleavings (ie, M=5) in a 30kHz SCS, as described above. In detail, as described above, the interleaving structure can be configured by considering that the number of RBs used to constitute a single RBS is 100 to 110 RBs in a 15kHz SCS and 50 to 55 RBs in a 30kHz SCS based on the LBT BW.

[0245] That is, in the case of 15kHz SCS, some resources (ie, RBs) of the same interlace may exist once every 10 RBs. Here, the interlace value may be configured using a difference value based on at least one of different RBS sizes (LBT BW), SCS, and the number of RBs constituting a single interlace, and may not be limited to a specific embodiment.

[0247] CRB to SL interleaving index mapping method (CRB to SL interleaving mapping) and SL interleaving (one or more) and sub-signal Channel mapping method (interleaving index to sub-channel mapping)

[0249] For example, k interleavings may be set to constitute a single subchannel. Here, k may be an integer or may not include 0 or a fraction (or a number of decimal points). If k is an integer, k interleavings may be set to constitute a single subchannel. On the other hand, if k is a fraction (or a number of decimal points), multiple subchannels may be associated with a single interleaving index. For example, if k=1 / 2, a single interleaving index may correspond to two subchannel indices.

[0250] The following description is made based on the fact that CRB and interleaving indexing are performed from a carrier perspective. That is, the description is made based on the fact that CRB starts from point A and interleaving indexing is performed based on CRB, but it may not be limited thereto.

[0251] In addition, for example, an RBS configuration for a sidelink unlicensed band may be provided based on a CRB-based intra-cell guard band configuration, which may be similar to the above Fig. 9 Here, when configuring the SL BWP, at least one resource may be configured within the SL BWP. In addition, a single resource pool may be configured to be included in at least one RBS. On the other hand, subchannel indexing may be independently performed within a single resource pool, but may not be limited thereto.

[0252] Here, for example, interleaving index assignment in CRB can be performed based on two methods. In detail, interleaving index assignment can be performed uniformly based on the interval (M) in CRB in the frequency domain (hereinafter, option 1). Alternatively, interleaving index assignment can be performed non-uniformly in CRB in the frequency domain (hereinafter, option 2). When interleaving indexes are assigned based on option 2, interleaving indexes can be randomly assigned, or interleaving indexes can be assigned based on interleaving-based indexing.

[0253] After the interleaving index is assigned, the assignment between the assigned interleaving index and each subchannel can be performed based on two methods. For example, each subchannel index constituting a single resource pool can be mapped to each of the consecutive sidelink interleaving indexes (one or more) (hereinafter, option A). Alternatively, each subchannel index constituting a single resource pool can be mapped to a non-consecutive sidelink interleaving index (one or more) (hereinafter, option B).

[0254] In addition, for example, a case where multiple RBSs are configured in a single resource pool within a single BWP may be considered. Here, the relationship between the subchannel index and the sidelink interlace index may be different. For example, the subchannel index-and-sidelink interlace index relationship may be applied to all RBSs configured within a single resource pool (hereinafter, Option I). For example, when the subchannel index and sidelink interlace index relationship is applied to all RBSs configured within a single resource pool, the same relationship may even be applied to the guard band resources between the RBSs, but may not be limited thereto.

[0255] Alternatively, the subchannel index and the sidelink interleaving index relationship may be independently applied to each RBS configured within a single resource pool (hereinafter, Option II). Here, since the relationship between the subchannel index and the sidelink interleaving index is independently applied to each RBS, the above relationship may not be applied to the protection band. Alternatively, the subchannel index and the sidelink interleaving index relationship may be independently applied to each of the RBSs configured in a single resource pool (Option III). Here, for example, when some RBSs are continuous RBSs, the same subchannel index and sidelink interleaving index relationship may be applied to the protection band with continuous RBSs, but is not limited to a specific embodiment.

[0256] In addition, a higher layer configuration may be performed so that the subchannel index and the interleaving index relationship correspond sequentially to the lowest subchannel index starting from the lowest interleaving index. As another example, the subchannel index and the interleaving index relationship may be sequentially configured so that the interleaving index corresponding to the lowest frequency resource in the frequency domain within the resource pool is assigned to the lowest subchannel index, and is not limited to a specific embodiment.

[0257] Hereinafter, methods of applying all or some of the aforementioned combinations of options 1 / 2, options A / B, and options I / II / III are described. For the purpose of exemption from description, all methods based on the aforementioned combinations of options 1 / 2, options A / B, and options I / II / III may be applied to the sidelink unlicensed band. As another example, some methods based on the aforementioned combinations of options 1 / 2, options A / B, and options I / II / III may be applied to the sidelink unlicensed band.

[0258] As another example, each of the methods based on the combination of the above-mentioned options 1 / 2, options A / B, and options I / II / III may be applied independently, regardless of the other methods. Here, which method based on the above-mentioned configurable combination is applied may be indicated by a higher-layer configuration. That is, a parameter may be set to at least one of the above-mentioned options, and the option applied by each parameter may be indicated by a higher-layer configuration. As another example, which method based on the above-mentioned configurable combination may be pre-configured. That is, although each of the above-mentioned combinations is described below for the sake of clarity of description, only a predetermined specific method may be applied, and all of the following combinations may not need to be considered. As another example, in the above-mentioned configurable combination, some options may be indicated by a higher-layer configuration, and some options may be applied by a predetermined method, and this may not be limited to a specific embodiment.

[0259] As a detailed example, option 1-A may represent an option based on a combination of option 1 and option A. Similarly, option 2-A may represent an option based on a combination of option 2 and option A. Similarly, option 2-B may represent an operation based on a combination of option 2 and option B. Here, by considering a case where multiple RBSs are configured in a single resource pool within a single BWP, in addition to the above combinations, the above options I, II, and III may be additionally applied. For example, the relationship configuration between the final subchannel and the interlace and CRB may be generated based on the above combinations.

[0260] Here, for example, the interleaving configuration of Table 17 below can be considered based on the LBT BW 20MHz (i.e., RBS size) of the side link unlicensed band. However, this is only an example, and different values ​​can be considered according to different SCS values, interleaving structures, and the entire RBS size, and is not limited to a specific embodiment. Here, CRB and interleaving indexing can be performed based on point A within a single carrier bandwidth. For example, the aforementioned configuration can be a value determined according to the SCS, the frequency band of the unlicensed band, and the carrier bandwidth.

[0261] [Table 17]

[0262]

[0264] Option 1 (based on a unified CRB to interleaved index relationship configuration method)

[0265] When a unified CRB-to-interlace index assignment method is configured by a higher layer, M interleaved resource blocks may be set for each 15kHz SCS (μ=0) and 30kHz SCS (μ=1), as shown in Table 18 below. Here, consecutive interleaving indexes (m∈0,1,…,M-1) may be configured in CRBs ({m,M+m,2M+m,3M+m,…) in the frequency domain. Interleaved RBs of consecutive interleavings of SL BWP i m and The relationship between can be determined according to the following equation 6.

[0266] [Table 18]

[0267] μ M 0 10 1 5

[0269] [Equation 6]

[0270]

[0272] For example, Fig. 20 The diagram illustrates a case where subchannel indices are mapped to consecutive sidelink interleaving indices based on a unified CRB to interleaving index relationship applicable to the present disclosure. Fig. 20 , in the frequency domain, interleaving indexes can be allocated in consecutive CRBs, and a mapping relationship between interleaving indexes and subchannel indexes can be configured. Here, interleaving (M) and subchannel (N) can have a one-to-one relationship (ie, k=1). For example, when two or more interleaving indexes are configured to be assigned to a single subchannel index (k=2), two consecutive interleaving indexes can be assigned to a single subchannel. When two interleaving indexes are assigned to a single subchannel index, interleaving indexes #0 and #1 can be mapped to subchannel index #0, interleaving indexes #2 and #3 can be mapped to subchannel index #1, and interleaving indexes #4 and #0 can be mapped to subchannel index #2, and sequential mapping can be performed in the same manner.

[0273] Here, as an assignment method between interleaving and subchannels, only resources within the number of interleavings (M) that have a multiple relationship with respect to the subchannel and the interleaving mapping may be used as side link resources. For example, if there are remaining interleaving resources after applying the above multiple relationships, the corresponding resources may not be used. As another example, the configuration may be limited to having only multiple relationships relative to each other at all times, but this is not limited to a specific embodiment.

[0274] Here, for the sake of clarity, the description is based on the case where interleaving (M) and subchannel (N) have a one-to-one relationship. Fig. 20 In detail, the SL-U resource pool may be configured in the SL-UBWP in the specific CRB 2010 based on the consecutive CRBs and point A. Two consecutive RBSs may be included in the SL-U resource pool.

[0275] Here, the interleaving index may be allocated based on the above equation 6, starting from the interleaving index #0 2020 based on the specific CRB 2010. In addition, the subchannel indexes may be sequentially mapped starting from the lowest subchannel index #0 2030 corresponding to the lowest interleaving index #0 2020. Based on the above, in the CRB in the frequency domain, the interleaving index may be uniformly allocated based on a specific interval (M), and each subchannel index constituting a single resource pool may be mapped to each of the consecutive side link indexes, which may be the aforementioned option 1-A method.

[0277] Option 2 (based on non-uniform CRB-interlace index relationship configuration method)

[0278] Fig.21 The diagram illustrates a case where CRBs are non-uniformly allocated to interleaving indices and subchannel indices are mapped to each of consecutive interleaving indices, which is applicable to the present disclosure. Fig.21 , in the CRB in the frequency domain, the interleaving index may be allocated non-uniformly. That is, the interleaving indexing may be applied in a different order for each interleaving block. For example, the interleaving block may be an interleaving set corresponding to the number of interleavings. In detail, the first interleaving block 2110 may be an interleaving set corresponding to the number of interleavings (M=5). Here, Fig.21 It can correspond to the case where two RBSs are configured in a single SL-U resource pool in a single SL-U BWP. For example, interleaving indexes can be allocated based on consecutive CRBs and point A, and as described above, interleaving index compilation can be applied in a different order for each interleaving block. For example, in the SL-U resource pool, interleaving index compilation can be applied to interleaving block 2120 in a different order from the first interleaving block 2110. In this way, the CRB and interleaving index relationship can be configured non-uniformly. Here, the subchannel index can be mapped to consecutive interleaving indexes. That is, the subchannel index can be mapped to the lowest interleaving index. That is, interleaving index #0 and subchannel index #0 can be mapped. Therefore, Fig.21 This can be an Option 2-A approach based on the previous options.

[0279] on the other hand, Fig. 22The diagram illustrates a method of assigning subchannel indexes based on the interleaving index within the lowest interleaving block (M) 2210 in the frequency of the resource pool. Here, each subchannel index can be assigned sequentially from #0 to the maximum subchannel index based on the interleaving index (same index) corresponding to the lowest interleaving. That is, the interleaving index #2 of the lowest frequency resource block within the interleaving block 2210 can be mapped to subchannel index #0, the subsequent interleaving index #3 can be mapped to subchannel index #1, and the interleaving index and subchannel index can be mapped based on the same method. Here, the same subchannel index can be mapped to the same interleaving index. For example, in Fig. 22 In, with Fig.21 In contrast, the indexing method may be applied differently depending on the location in the frequency domain.

[0280] For example, when a non-uniform CRB-to-interleaving index relationship is configured, the number of interleaved resource blocks can be determined based on Table 18 above. Here, in the frequency domain, the interleaving index (m∈{0,1,…,M-1}) can be related to the CRB in a non-uniform form. and interweaving The relationship between can be determined according to the following equation 7. It can be the CRB index starting from the relative BWP of CRB#0. In addition, the relationship between the continuous interleave m and the non-uniform interleave m' can be considered.

[0281] As a detailed example, a non-uniform interleave m′ may be generated by applying a cyclic block interleaver to each interleaving block (M). As a detailed example, if M=5, then the X×Y block interleaver set may be as shown in Tables 19 and Fig.23 as shown in .

[0282] [Table 19]

[0283]

[0285] [Equation 7]

[0286] m′=f inter (m)

[0288] Here, considering 23, Table 19 and Equation 7, the CRB to interleaving assignment method using the block interleaver can be finally configured based on "CRB-consecutive interlace index-interleaved interlace index". In addition, based on the above, the relationship between CRB and interleaving can be as follows Fig. 22 The mapping is performed as shown. The block interleaver can be configured with a relationship to continuous interleaving according to a cyclic predefined pattern or a high-level configuration for every M interleavings (interleaving blocks). As a detailed example, the block interleaver can be cyclically configured according to a pattern for every M interleavings, such as "No.1->No.4->No.2->No.3->No.1->No.4->No.2->No.3..." Here, for example, the relationship between the block interleaver and the continuous interleaving index can be a preconfigured relationship. As another example, the aforementioned cyclic pattern can be determined according to a higher-level configuration.

[0289] In addition, a random cyclic block interleaver may be applied to each interleaving block (M). For example, as described above, the cyclic block interleaver may be determined according to a preconfigured pattern or configuration. Here, the cyclic block interleaver may generate and cyclically apply a block interleaver index i determined by a random sequence, and the following equation 8 may be considered.

[0290] In addition, for example, a gold sequence of length 31 may be used to generate a random block interleaver index. Here, the random sequence c(n) may be as shown in the following equation 9, but may not be limited thereto. For example, in equation 9, N C =1600, the first m-sequence (m-sequence) and x1(n) may be initialized by x1(0)=1, x1(n)=0, n=1, 2, ..., 30. In addition, the initialization of the second m-sequence and x2(n) may be performed according to the following equation 10. Here, based on the initial value determined according to the case where the corresponding sequence is applied, the initialization may be performed according to the following equation 10. In addition, for example, the initial value c of the random sequence c(i) generator for generating the block interleaver index init Can be a specific value (for example, c init =1010). As yet another example, the initial value may use at least one of the following: a sidelink ID indicating a cast type and a link between UEs, a sidelink synchronization ID, and BWP or SL carrier related ID (partial) information. The set of block interleaver indices may be predetermined or configured by a higher layer.

[0291] [Equation 8]

[0292] m′=finter,i (m)

[0293] [Equation 9]

[0294]

[0295] [Equation 10]

[0296]

[0298] As yet another example, a non-uniform CRB-to-interleaving index relationship may be determined according to Equation 11 below based on a combination of a random function and at least one block interleaver for each interleaving block (M).

[0299] [Equation 11]

[0300]

[0302] Here, the initial value c of the random sequence c(i) generator is imit Can be a specific value (e.g., c init =1010). As yet another example, the initial value may use at least one of the following: a sidelink ID indicating the playout type and the link between the UEs, a sidelink synchronization ID, and BWP or SL carrier related ID (partial) information. The set of block interleaver indices may be predetermined or configured by a higher layer.

[0303] In addition, the function f inter (m) may be a block interleaver that interleaves m∈{0,1,…,M-1} sequential interleaving indices as in the aforementioned method, and generates an independent interleaving interleave for each M interleaving RB. In addition, by independently adding a specific offset value generated by a random sequence to each M interleaving, a more random interleaving index than the above method may be generated. Here, Fig.24 A method for configuring non-uniform CRBs to interleaving indexes based on a combination of a block interleaver and a random function applicable to the present disclosure is shown.

[0304] refer to Fig.24 , after applying a specific block interleaver (e.g., 2×3), a random offset value may be added to each M interleavings. Here, an independent interleaving index may be generated for each M interleavings (i.e., k=0, 1, 2…). Here, as described above, the relationship of “CRB-continuous interleaving index-interleaving index” may be finally considered, and the relationship between CRB and interleaving index may be configured. Here, as Fig.24As shown, the block interleaver can be configured to have a size of X×Y according to the size of a single interleaving block. For example, when five interleavings are configured, a block interleaver structure such as "X×Y={3×2 or 2×3}" can be used based on five interleavings from 0 to 4. After the block interleaver structure is applied to the interleaving, a random offset value can be independently generated using a random sequence and added to each interleaving block. Then, a "mod M" operation can be applied to the interleaving block to which the random offset value is added, and based on this, a non-uniform CRB to interleaving index assignment can be finally performed, which can be as shown in FIG. Fig.24 As shown in . As another example, random sequence generation can be used within several interleavings to generate random interleaving indexes. That is, a random sequence generator can also be used to perform different interleaving assignments per K indexes without using block interleaving for the interleaving blocks.

[0305] Fig.25 A method for mapping each of the subchannel indexes constituting a single resource pool to a non-contiguous side link index applicable to the present disclosure is shown. Fig.25 , different interleaving indices can be mapped to a single subchannel index for every M interleavings. As a detailed example, subchannel indexing can be defined by a resource pool configuration. Fig.25 Since the subchannel index is set by one resource pool configuration, the subchannel index #0 may be allocated to the RB 2510 corresponding to the interleaving index #0 and the RB 2520 corresponding to the interleaving index #2, which may be similar to the above Figure 20 to Figure 22 That is, the lowest interlace index may not be mapped to the lowest subchannel index, or the interlace with the lowest frequency within the interlace block may not be mapped to a subchannel index.

[0306] For example, Table 20 below may represent a case where subchannels with M=10 and N=5 are configured in a single resource pool based on an interleaving structure. Here, since two interleaving indexes are mapped to a single subchannel, k may be 2. On the other hand, Table 21 may represent a case where subchannels with M=10 and N=10 are configured in a single resource pool based on an interleaving structure. Here, since a single interleaving index is mapped to a single subchannel, k may be 1. As another example, Table 22 may represent a case where subchannels with M=10 and N=20 are configured in a single resource pool based on an interleaving structure. Here, since two subchannel indexes are mapped to a single interleaving index, k may be 1 / 2.

[0307] For example, since subchannel indexing is defined by a resource pool configuration, the assignment relationship of CRB, interlace, and subchannel can be configured as shown in the following Tables 20, 21, and 22. For example, in the following Tables 20, 21, and 22, various numbers of associated interlaces for each subchannel can be configured based on a configuration based on the number of subchannels (N) or the subchannel size (number of RBs) and based on a continuous interlace structure based on M=10 corresponding to a 15kHz SCS.

[0308] Here, for example, the number of interleaving indices associated with a single subchannel can be determined based on the value of M and the number of subchannels (N) configured for a single resource pool. As another example, the interleaving-subchannel relationship can be determined using the number of RBs per subchannel rather than the number of configured subchannels. Based on the above, two interleavings can be associated with each single subchannel (Table 20), each single subchannel can be associated with a single interleaving (Table 21), or every two subchannels can be associated with a single interleaving (Table 22) based on [N:M], which is the ratio between the number of subchannels and the number of interleavings. Therefore, in the sidelink unlicensed band, the number of RBs per subchannel can be automatically determined using a higher layer parameter configuration that is defined in the sidelink according to the [N:M] ratio.

[0309] [Table 20]

[0310]

[0313] [Table 21]

[0314]

[0317] [Table 22]

[0319]

[0323] As yet another example, Fig.26 and Fig. 27An interleaving structure applicable to the present disclosure is shown.

[0324] Fig.26 The interlace assignment when M=10 is illustrated based on 100 RBs in 15kHz SCS. Here, N=10. That is, a single interlace can be mapped to a single subchannel. For example, it can be configured based on Fig.26 RB 2610 with the lowest interleaving index in the total 10 interleavings is mapped to the lowest subchannel index. That is, the frequency resource corresponding to the lowest interleaving index #0 in the total 10 interleavings can be mapped to subchannel index #0. In addition, the frequency resource corresponding to the subsequent interleaving index #1 can be mapped to subchannel index #1. In addition, the remaining subchannel indexes #2 to #9 can be mapped based on the same method.

[0325] Here, for example, Fig.26 It may involve an interleaving structure with uniform RB spacing and may be the same as the aforementioned option 1-A. On the other hand, Fig. 27 It may involve an interleaving structure with non-uniform RB spacing and may be the same as the aforementioned option 2-A.

[0326] Here, for example, refer to Fig.26 , the case where different UEs perform communication of adjacent interleaving indices (or subchannel indices) can be considered. Here, it is necessary to minimize the in-band emission (IBE) effect that may occur based on the side link communication between different UEs, and for this purpose, it may be advantageous to configure the interleaving index interval non-uniformly. That is, there is an advantage that the IBE effect between UEs at adjacent positions can be minimized based on the non-uniformly configured interleaving structure.

[0327] In addition, for example, as described above, both the unified interleaving structure and the non-uniform interleaving structure can perform mapping between the lowest subchannel indexes, starting from the lowest interleaving index, according to the [N:M] ratio. That is, regardless of the different interleaving mapping methods of option 1 or option 2, the interleaving index and subchannel index mapping can be different according to the [N:M] ratio. For example, if N=1:M=1, interleaving index #0 and subchannel index #0 can be mapped to mutually related resources. In addition, as described above, the subsequent interleaving index #1 and subchannel index #1 can be mapped to mutually related resources.

[0329] <Frequency resource assignment instruction method for unlicensed band side link communication>

[0330] Fig.28 The side link frequency resource assignment method applicable to the present disclosure is shown. Fig.28, the Rx UE performing sidelink communication may receive sidelink control information (SCI) sent from the Tx UE. Here, the SCI may include a frequency resource assignment field and a time resource assignment field. Here, the Tx UE may indicate PSSCH resources in up to three time slots by a frequency resource indication value (FRIV) indicated by the frequency resource assignment field and a time resource indication value (TRIV) indicated by the time resource assignment field. For example, the maximum time / frequency resource assignment that may be indicated by SCI signaling may be two time slots or three time slots. Here, the maximum available time / frequency resource may be indicated in an RRC parameter (e.g., sl-MaxNumPerReserve) configured based on higher layer signaling.

[0331] For example, if based on higher layer signaling, sl-MaxNumPerReserve=2, the UE may indicate time / frequency resource reservation in up to two time slots. As another example, if based on higher layer signaling, sl-MaxNumPerReserve=3, the UE may indicate time / frequency resource reservation in up to three time slots, which may be as shown in Table 23 below.

[0332] [Table 23]

[0333]

[0335] The Rx UE may perform blind decoding for PSCCH reception considering the subchannels within the Rx resource pool and the available candidate PSCCH resource positions. The Rx UE may decode the first SCI (1 st The Rx UE may decode the allocated resources 2810 and the subsequently reserved resources 2820 and 2830 based on the resource assignment information in the first time slot in which the first SCI is received. For example, based on the above content, if Nmax=2, the Rx UE may verify the allocated resources 2810 and the resources 2820 allocated to the second time slot as the subsequent reserved resources in the first time slot. In addition, if Nmax=3, the Rx UE may verify the allocated resources 2810 and the resources 2820 allocated to the second time slot as the subsequent reserved resources in the first time slot and the resources 2830 allocated to the third time slot. For example, the Rx UE may verify the reserved resources through the time / frequency resource assignment field within the received SCI. As a detailed example, the FRIV within the SCI may indicate the same number of subchannels in three time slots and different subchannel starts.

[0336] For more details, refer to Fig.28, the Rx UE can obtain the PSSCH transmission resource assignment reservation information in the second time slot and the third time slot through the SCI in the PSSCH received in the first time slot. Here, the Rx UE can verify the positions of the second time slot and the third time slot through the TRIV-based logical time slot offset value within the SCI of the first time slot. In addition, the frequency assignment information can be provided by indicating the same number of allocated subchannels and different subchannel start information for each time slot in the FRIV.

[0337] Therefore, the Rx UE can receive the PSSCH by verifying the time / frequency resource indication information field to receive the transport block (TB) expected to be sent to the Rx UE by blind decoding from all available subchannels of the first SCI (PSCCH). Here, when additional scheduling resources exist based on the SCI, the Rx UE can obtain the second or second / third time slot / frequency (subchannel) resource assignment information based on the time / frequency resource indication information. Then, the Rx UE can receive the expected PSCCH / PSSCH from the second or second / third time slot / frequency (subchannel) resource based on the resource assignment information.

[0338] Here, for example, a PSSCH transmission resource assignment method that takes into account unlicensed bands may be considered. As described above, since the unlicensed band may perform transmission after occupying the channel based on LBT, a PSSCH transmission resource assignment method that considers the same situation may need to be considered. For example, a first SCI (PSCCH) may be sent based on a specific subchannel / interleaving index in a first time slot (resource). For example, the lowest subchannel index or the lowest interleaving index may be determined as the starting subchannel index or the starting interleaving index of the first resource. Here, the Rx UE may verify the number of allocated subchannels ( In addition, when at least one of the second time slot and the third time slot is configured and indicated, at least one of the start subchannel index and the interleaving index of the configured resource may be verified. In addition, for example, the Rx UE may verify the signaling format.

[0339] Here, the total number of subchannels in a single resource pool may be allocated based on at least one of the subcarrier spacing, the number of interlaces in the resource pool, and the subchannel-interlace assignment relationship. is set to various values. For example, in conventional sidelink signaling, for one resource pool configuration, the number of subchannels may be set to one value. However, the corresponding value may be set differently by considering the RB resource configuration based on the interleave. As a detailed example, in a 30kHz SCS, if the number of interlaces is 5 and the number of subchannel-interlaces is 2, the total number of subchannels within a single resource pool is It can be set to 2 or 3. Here, the signaling method can be based on the total number of sub-channels in a single resource pool. What value is set varies flexibly. However, the above configuration is only an example and may not be limited thereto.

[0340] As another example, in sidelink communication, the time resources used based on higher layer signaling can be determined as two time slots or three time slots.Here, the subchannel-based frequency resources in the second time slot or the second time slot / third time slot can be indicated based on the SCI of the first time slot.

[0341] For example, if sl-MaxNumPerReserve=2 (ie, in the case of using two time slots), FRIV may indicate frequency resources based on the following equation 12. Here, if is greater than or equal to 'T', the frequency resource can be indicated by FRIV based on the following equation 12. On the contrary, if If the bitmap is smaller than 'T', the frequency resources can be indicated by applying a bitmap instead of FRIV. Here, the length of the bitmap can be Here, the T value may be set to a specific value, and may be a value determined based on whether the indication through the bitmap is more effective than the indication through the FRIV. As a detailed example, as described above, the number of subchannels within the resource pool may be determined differently based on the interleaving to subchannel ratio [M:N]. Here, if a small number of subchannels is required based on the interleaving to subchannel ratio [M:N], the indication through the bitmap may be more effective than the indication through the FRIV. In view of the above, whether to apply FRIV and whether to apply the bitmap may be determined based on the T value. Here, for example, according to the subchannel configuration method, it may be finally possible to determine whether to apply FRIV based on the specific Value to apply FRIV or bitmap methods without The comparison is made between the values ​​of and T and is not limited to a specific embodiment.

[0342] [Equation 12]

[0343]

[0345] As another example, if sl-MaxNumPerReserve=3 (ie, in the case of using three time slots), FRIV may indicate frequency resources based on the following equation 13. Here, if is greater than or equal to 'T', the frequency resource can be indicated by FRIV based on equation 13. Conversely, if If it is less than 'T', the frequency resource can be indicated by a bitmap. Here, the length of the bitmap can be Here, for example, according to the sub-channel configuration method, it is finally possible to Value to apply FRIV or bitmap methods without The comparison is made between the values ​​of and T and is not limited to a specific embodiment.

[0346] [Equation 13]

[0347]

[0349] In equations 12 and 13, It can be the starting subchannel index of the second time slot resource. In addition, in equation 13, It can be the starting subchannel index of the third time slot resource. In addition, in equations 12 and 13, The total number of subchannels based on interlace assignment may be configured by a higher layer based on at least one of CRB to interlace assignment and interlace-subchannel assignment in a single resource pool. In addition, for example, is the number of subchannels assigned based on the actual allocated interlace, and can range from 1 to is determined within.

[0350] As another example, one or more RBSs may be configured in a single resource pool. The RBS that actually transmits the PSSCH may be determined among the one or more RBSs configured in the resource pool, and a method of indicating this may be required. For example, since the PSSCH may be transmitted by consecutive RBSs, consecutive RBS indices may be indicated by the RIV. Here, the number of bits used for the maximum possible RBS indication field may be determined based on the RIV of the frequency resource assignment field within the SCI format and the maximum number of configured RBSs.

[0351] In addition, for example, a case may be considered in which a higher layer parameter indicating subchannel-based SL-UPSCCH / PSSCH transmission with an interleaved structure is configured in a frequency resource assignment within an SCI format (e.g., SCI format 1-A). Here, if the higher layer parameter sl-MaxNumPerReserve=2, the bits of the frequency resource assignment field may be determined based on the following equation 14. Here, if The length is equal to 'T', then the bits can be determined based on the following equation 14. Conversely, if If the length is less than 'T', it can be used based on the bitmap. Bit.

[0352] [Equation 14]

[0353]

[0354] As yet another example, if the higher layer parameter sl-MaxNumPerReserve=3, the bits of the frequency resource assignment field may be determined based on the following equation 15. Here, if The length is equal to 'T', then the bits can be determined based on Equation 15. A bitmap can be used On the contrary, if If the length is less than 'T', it can be used based on the bitmap Here, as described above, the T value may be a value selected by considering a case where the bitmap length is more efficient than the RIV.

[0355] [Equation 15]

[0356]

[0358] Fig.29 The frequency resource assignment method based on the unified interleaving structure applicable to the present disclosure is shown. In addition, Fig.30 A frequency resource assignment method based on a non-uniform interleaving structure applicable to the present disclosure is shown.

[0359] Fig.29 and 30 It may be a frequency assignment method for three time slots based on the case where sl-MaxNumPerReserve is set to 3. In addition, Fig.29 and 30 It may be the case where a single resource pool is based on the subchannel index of the interleaving index set according to Table 24 below. However, Fig.29 and 30 This is just an example for describing clarity and may not be limited to the above embodiments.

[0360] [Table 24]

[0361]

[0363] For details, refer to Fig.29 , resources can be allocated based on the subchannel index. Here, the subchannel index and interleaving index can be the same as those in the above reference Fig.26Same as described. As another example, resource assignment can be performed by an interleaving index according to an interleaving-based RB assignment method. For example, resource assignment can be identified by a resource pool configuration within an SL BWP in the frequency domain, at least one of: a first available interleaving index (i.e., interleaving index = 4) corresponding to the lowest interleaving index (or a CRB index included in the lowest interleaving index) and an associated lowest subchannel index (i.e., subchannel index = 0). Here, the total number of available interleavings / subchannels within the corresponding resource pool can be determined by the interleavings / subchannels corresponding to the resource pool configuration and the intersection of the interleavings / subchannels.

[0364] For example, the number of interleavings within a carrier bandwidth may be determined based on the frequency band, SCS, LBT BW (RBS BW), and carrier bandwidth. Here, the number of interleavings may be predetermined or may be configured by higher layer signaling, and is not limited to a specific embodiment. In addition, for example, the information of the frequency resource assignment for the side link unlicensed band as shown in Table 25 below may be configured in the UE by higher layer signaling, and is not limited to a specific embodiment.

[0365] [Table 25]

[0366]

[0368] Fig.31 is a flowchart illustrating a method for assigning side link unlicensed band frequency resources applicable to the present disclosure. Fig.31, the UE can obtain resource information on the sidelink unlicensed band of the single carrier bandwidth (S3110). Here, the resource pool information of the sidelink unlicensed band can be provided to the UE based on at least one of the RBS configuration / index information and the interleaving / subchannel-based configuration information. Here, for example, in the resource pool configuration operation of the sidelink unlicensed band, the resource pool of the sidelink unlicensed band may include continuous frequency resources (case 1). As another example, according to the resource pool configuration operation of the sidelink unlicensed band, the resource pool of the sidelink unlicensed band may be configured discontinuously considering the interleaving structure (case 2). However, in all the above cases, a frequency resource assignment method based on interleaving may be considered. Here, considering the mapping relationship between CRB and sidelink interleaving index, the resource pool of the sidelink unlicensed band may be configured with RB resources based on interleaving. Moreover, the corresponding sidelink interleaving (multiple) may be mapped to a subchannel. Here, for example, CRBs may be uniformly assigned to interleaving indexes (multiple) based on intervals (M) (option 1). As yet another example, CRBs may be non-uniformly and non-contiguously assigned to interleaving indexes (multiple) (Option 2). Moreover, each of the subchannel indexes constituting a single resource pool may be mapped to a continuous sidelink interleaving index (multiple) (Option A). As yet another example, each of the subchannel indexes constituting a single resource pool may be mapped to a non-contiguous sidelink interleaving index (multiple), which is described above (Option B).

[0369] The sidelink unlicensed band resource pool may be configured based on the resource pool configuration information of the sidelink unlicensed band (S3120), and the number of RBSs and subchannels used for PSSCH transmission in the resource pool of a single sidelink unlicensed band may be determined (S3130). Then, the Tx UE may provide information about the number of RBSs and subchannels determined for PSSCH transmission to the Rx UE through an SCI (corresponding to at least one of the PSCCH and the second SCI) (S3140). Here, for example, the maximum number of available time slots based on the SCI of the first time slot may be provided to the UE through a higher layer configuration. For example, the maximum number of available time slots may be 2 or 3. Therefore, the Tx UE may send PSSCH / PSCCH to the Rx UE through the first time slot and the second time slot or through the first time slot, the second time slot, and the third time slot. Here, the frequency resource assignment information included in the SCI may indicate different subchannel start information and the same number of subchannels for all time slots based on the maximum number of available time slots. Here, the number of subchannels in a single resource pool refers to the number of subchannels based on interleaving, and can be set to various values ​​in consideration of at least one of the SCS, the number of interleavings in the corresponding resource pool, and the subchannel-interleaving assignment relationship. Moreover, at least one RBS can be configured in a single resource pool. Here, the RBS used for PSSCH transmission among the RBSs configured in the resource pool can be indicated by SCI signaling. For example, the RBS used for PSSCH transmission can be indicated to the Rx UE based on the number of starting RBSs and consecutive RBSs. Then, the Tx UE and the Rx UE can perform sidelink communication in the sidelink unlicensed band based on the frequency resource information.

[0370] Fig.32 is a diagram showing a base station device and a UE device to which the present disclosure can be applied.

[0371] The base station device 3200 may include a processor 3220 , an antenna unit 3212 , a transceiver 3214 , and a memory 3216 .

[0372] The processor 3220 performs baseband-related signal processing and may include a higher layer processor 3230 and a physical layer processor 3240. The higher layer processor 3230 may process the operation of a media access control (MAC) layer, a radio resource control (RRC) layer, or a higher layer thereof. The physical layer processor 3240 may process the operation of a physical (PHY) layer (e.g., uplink received signal processing, downlink transmitted signal processing). In addition, in order to perform baseband-related signal processing, the processor 3220 may also control the operation of the base station device 3200 as a whole.

[0373] The antenna unit 3212 may include one or more physical antennas, and may support multiple-input multiple-output (MIMO) transmission and reception when multiple antennas are included. In addition, beamforming may be supported.

[0374] The memory 3216 may store information processed by the processor 3220 , software, operating system, applications, etc. related to the operation of the base station device 3200 , and may include components such as a buffer.

[0375] The processor 3220 of the base station 3200 may be configured to implement the operations of the base station in the examples described herein.

[0376] The UE device 3250 may include a processor 3270, an antenna unit 3262, a transceiver 3264, and a memory 3266. For example, here, the UE device 3250 may perform communication with the base station device 3200. As another example, here, the UE device 3250 may perform SL communication with another UE device. That is, the UE device 3250 used in this article refers to a device that can communicate with at least one of the base station device 3200 and other UE devices, and is not limited to communicating with a specific device.

[0377] The processor 3270 performs baseband-related signal processing and may include a higher layer processor 3280 and a physical layer processor 3290. The higher layer processor 3280 may process the operation of the MAC layer, the RRC layer, or a higher layer. The physical layer processor 3290 may process the operation of the PHY layer (e.g., downlink received signal processing, uplink transmitted signal processing). In addition, in order to perform baseband-related signal processing, the processor 3270 may also control the operation of the UE device 3250 as a whole.

[0378] The antenna unit 3262 may include one or more physical antennas, and may support MIMO transmission and reception when multiple antennas are included. In addition, beamforming may be supported.

[0379] The memory 3266 may store computer-processed information related to the operation of the UE device 3250 of the processor 3270 , software, operating system, applications, etc., and may include components such as a buffer.

[0380] According to the example of the present disclosure, the terminal device 3250 may be associated with a vehicle. For example, the terminal device 3250 may be integrated in a vehicle, may be located in a vehicle, or may be located on a vehicle. In addition, the terminal device 3250 according to the present disclosure may be the vehicle itself. In addition, the terminal device 3250 according to the present disclosure may be at least one of a wearable terminal, an AR / VR, an Internet of Things (IoT) terminal, a robot terminal, and a public safety terminal. The terminal device 3250 to which the present disclosure may be applied may include various types of communication devices that support interactive services using side links, for services, for example, Internet access, service execution, navigation, real-time information, autonomous driving, and safety and risk diagnosis. In addition, the terminal device 3250 may include an AR / VR device capable of performing side link operations or any type of communication device capable of performing relay operations as a sensor.

[0381] Here, the vehicle to which the present disclosure is applied may include an autonomous vehicle, a semi-autonomous vehicle, and a non-autonomous vehicle. Meanwhile, although the terminal device 3250 according to the example of the present disclosure is described in association with a vehicle, at least one of the UEs may not be associated with a vehicle. However, it is provided only as an example and should not be construed as limiting the application of the present invention.

[0382] In addition, the terminal device 3250 according to the example of the present disclosure may include various types of communication devices capable of performing collaboration to support interactive services using the side link. That is, the terminal device 3250 can directly support interactive services using the side link, and can be used as a collaborative device for supporting interactive services using the side link.

[0383] In addition, for example, the terminal device 3250 may also obtain resource information of the sidelink unlicensed band of the single carrier bandwidth. Here, the resource pool information of the sidelink unlicensed band may be provided to the terminal device 3250 based on at least one of the RBS configuration / index information and the interleaving / subchannel-based configuration information. Here, for example, in the resource pool configuration operation of the sidelink unlicensed band, the resource pool of the sidelink unlicensed band may include continuous frequency resources (case 1). As another example, according to the resource pool configuration operation of the sidelink unlicensed band, the resource pool of the sidelink unlicensed band may be configured discontinuously considering the interleaving structure (case 2). However, in all the above cases, a frequency resource assignment method based on interleaving may be considered. Here, considering the CRB to sidelink interleaving index mapping relationship, the resource pool of the sidelink unlicensed band may be configured with interleaving-based RB resources. Moreover, the corresponding sidelink interleaving (multiple) may be mapped to a subchannel. Here, for example, CRBs may be uniformly assigned to interleaving indexes (multiple) based on intervals (M) (option 1). As yet another example, CRBs may be non-uniformly and non-contiguously assigned to interleaving indexes (multiple) (Option 2). Moreover, each of the subchannel indexes constituting a single resource pool may be mapped to a continuous sidelink interleaving index (multiple) (Option A). As yet another example, each of the subchannel indexes constituting a single resource pool may be mapped to a non-contiguous sidelink interleaving index (multiple), which is described above (Option B).

[0384] The sidelink unlicensed band resource pool can be configured based on the resource pool configuration information of the sidelink unlicensed band, and the number of RBSs and subchannels used for PSSCH transmission in the resource pool of a single sidelink unlicensed band can be determined. Then, the terminal device 3250 can provide information about the number of RBSs and subchannels determined for PSSCH transmission to another terminal device through SCI. Here, for example, the maximum number of available time slots based on the SCI of the first time slot can be provided to the UE through a higher layer configuration. For example, the maximum number of available time slots can be 2 or 3. Therefore, the Tx UE can send PSSCH to the Rx UE through the first time slot and the second time slot or through the first time slot, the second time slot and the third time slot. Here, the frequency resource assignment information included in the SCI can indicate different subchannel start information and the same number of subchannels for all time slots based on the maximum number of available time slots. Here, the number of subchannels in a single resource pool refers to the number of subchannels based on interleaving, and can be set to various values ​​considering at least one of the SCS, the number of interleavings in the corresponding resource pool, and the subchannel-interleaving assignment relationship. Moreover, at least one RBS may be configured in a single resource pool. Here, the RBS used for PSSCH transmission among the RBSs configured in the resource pool may be indicated. For example, as described above, the RBS used for PSSCH transmission may be indicated to the Rx UE based on the number of the starting RBS and the consecutive RBSs. Then, the Tx UE and the Rx UE may perform sidelink communication in the sidelink unlicensed band based on the frequency resource information.

[0385] In addition, various embodiments of the present disclosure may be implemented by hardware, firmware, software, or a combination thereof. In the case of hardware implementation, the embodiments may be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), general purpose processors, controllers, microcontrollers, microprocessors, etc.

[0386] The scope of the present disclosure includes software or machine-executable instructions (e.g., OS, applications, firmware, programs, etc.) so that the operations of the methods according to various embodiments can be performed on a device or computer, and non-transitory computer-readable media that stores such software or instructions for execution on a device or computer.

[0387] Various embodiments of the present disclosure are used to explain representative aspects of the present disclosure rather than to list all possible combinations described in the various embodiments, and the contents described in the various embodiments may be applied alone or in combination of two or more embodiments.

[0390] Industrial Applicability

[0391] The above content can also be applied to other systems.

Claims

1. A method for configuring a side link resource pool in a user equipment (UE) in a wireless communication system, the method comprising: Receiving resource pool configuration information from a base station by the UE based on higher layer signaling; Sending sidelink control information (SCI) to another UE based on the resource pool configuration information; as well as performing sidelink communication with the other UE, The resource pool configuration information is based on the information of the side link resource pool configuration of the unlicensed frequency band.

2. The method according to claim 1, wherein: The sidelink resource pool configuration information of the unlicensed band includes at least one of: subchannel configuration and index information based on a single sidelink bandwidth part (SL BWP) in a single carrier bandwidth, interleaving configuration and index information, and resource block set (RBS) configuration and index information.

3. The method according to claim 2, wherein: Based on the sidelink resource pool configuration information of the unlicensed band, a common resource block (CRB) to interleaving index mapping and an interleaving index to subchannel index mapping are determined.

4. The method according to claim 1, wherein: The number of channels of the RBS and resources used to perform physical sidelink shared channel (PSSCH) transmission in the sidelink resource pool are indicated based on the SCI.

5. The method according to claim 4, wherein: The number of subchannels of the resource is determined as one of a plurality of values ​​based on at least one of a subcarrier spacing (SCS), a number of interlaces in the sidelink resource pool, and a subchannel-interlace allocation relationship.

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