Method and apparatus for performing sidelink communication in wireless communication system

Abstract

A method of configuring a sidelink resource pool to a user equipment (UE) in a wireless communication system may include receiving, by the UE from a base station, resource pool configuration information based on higher layer signaling; sending sidelink control information 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

[0002] 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”.

[0003] 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.

[0004] 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).

[0005] 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

[0006] 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.

[0007] The technical subject matter of the present disclosure relates to a method and apparatus for configuring a SL resource pool in an unlicensed band.

[0008] 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.

[0009] The technical subject matter of the present disclosure relates to a method and apparatus for transmitting a physical sidelink control channel (PSCCH) in a SL resource pool in an unlicensed band.

[0010] The technical subject matter of the present disclosure relates to a method and apparatus for assigning PSCCH resources in a SL resource pool in an unlicensed band.

[0011] The technical subject matter of the present disclosure relates to a method and apparatus for assigning first sidelink control information (SCI) and second SCI resources.

[0012] The technical subject matter of the present disclosure relates to a method and apparatus for assigning PSCCH resources based on a listen-before-talk (LBT) success status within a SL resource pool.

[0013] 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. Technical Solution

[0014] 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, by the UE, resource pool configuration information based on higher layer signaling from a base station; verifying a channel occupancy success status of at least one resource block set (RBS) within the resource pool based on the resource pool configuration information; performing PSCCH transmission by assigning physical sidelink control channel (PSCCH) resources within the at least one RBS based on the channel occupancy success status; and performing sidelink communication with another UE.

[0015] In addition, according to one aspect of the present disclosure, when the PSCCH resource is assigned in at least one RBS in which the channel is successfully occupied based on the channel occupation success status, the PSCCH resource can be assigned in any RBS of the at least one RBS in which the channel is successfully occupied.

[0016] In addition, according to one aspect of the present disclosure, when the PSCCH resources are assigned within at least one RBS where the channel is successfully occupied based on the channel occupation success status, the PSCCH resources can be assigned to each of the at least one RBS where the channel is successfully occupied, and the PSCCH can be copied and assigned to each of the at least one RBS where the channel is successfully occupied.

[0017] In addition, according to an aspect of the present disclosure, when the PSCCH resources are assigned within the at least one RBS, the PSCCH resources may be assigned to resources corresponding to the number of consecutive interleavings set starting from the lowest interleaving RB included in the lowest subchannel within the RBS.

[0018] In addition, according to one aspect of the present disclosure, when the PSCCH resources are assigned within the at least one RBS, the PSCCH resources may be assigned to resources corresponding to the number of non-contiguous interleavings set starting from the lowest interleaving RB included in the lowest subchannel within the RBS. Technical Effects

[0019] According to the present disclosure, a method of performing side link (SL) communication in a wireless communication system may be provided.

[0020] According to the present disclosure, a method of configuring a SL resource pool in an unlicensed band may be provided.

[0021] According to the present disclosure, a method for configuring a SL resource pool in an unlicensed band based on a resource block set (RBS) and interlace / sub-channel may be provided.

[0022] According to the present disclosure, a method for transmitting a physical sidelink control channel (PSCCH) in a SL resource pool in an unlicensed band may be provided.

[0023] According to the present disclosure, a method for assigning PSCCH resources in a SL resource pool in an unlicensed band may be provided.

[0024] According to the present disclosure, a method of assigning first sidelink control information (SCI) and second 1SCI resources may be provided.

[0025] According to the present disclosure, a method for assigning PSCCH resources based on a listen-before-talk (LBT) success status within a SL resource pool may be provided.

[0026] 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

[0027] Figure 1 An example of describing a New Radio (NR) frame structure to which the present disclosure is applicable is shown.

[0028] Figure 2 The NR resource structure to which the present disclosure is applicable is shown.

[0029] Figure 3The NR side link time slot structure to which the present disclosure is applicable is shown.

[0030] Figure 4 NR side link frequencies to which the present disclosure can be applied are shown.

[0031] Figure 5 The NR side link resource pool configuration to which the present disclosure can be applied is shown.

[0032] Figure 6 An unlicensed frequency band for each area used for NR sidelink communication to which the present disclosure is applicable is shown.

[0033] Figure 7 The use of a 5 gigahertz (GHz) unlicensed frequency band to which the present disclosure may be applied is shown.

[0034] 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.

[0035] 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.

[0036] Fig.10 An interleaving-based resource block (RB) resource assignment method to which the present disclosure can be applied is shown.

[0037] 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.

[0038] Fig.12 Channel Occupancy Time (COT) sharing and discovery burst transmission to which the present disclosure may be applied are shown.

[0039] 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.

[0040] Fig.14 A semi-static channel access procedure to which the present disclosure can be applied is shown.

[0041] Fig.15 A method of performing channel occupation to which the present disclosure can be applied is shown.

[0042] 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.

[0043] Fig.17 The time and frequency resources of the PSCCH to which the present disclosure is applicable are shown.

[0044] Fig.18 A method of assigning PSCCH resources in a neighboring RBS to which the present disclosure is applicable.

[0045] Fig.19 A method of assigning PSCCH channel resources in a neighboring RBS to which the present disclosure is applicable.

[0046] Fig. 20 A case where a plurality of resource block sets (RBSs) are configured in a single resource pool to which the present disclosure can be applied is shown.

[0047] Fig.21 It shows a case where multiple RBSs are configured in a resource pool, to which the present disclosure can be applied.

[0048] Fig. 22 It shows a case where multiple RBSs are configured in a resource pool, to which the present disclosure can be applied.

[0049] Fig.23 It shows a case where multiple RBSs are configured in a resource pool, to which the present disclosure can be applied.

[0050] Fig.24 It shows a case where multiple RBSs are configured in a resource pool, to which the present disclosure can be applied.

[0051] Fig.25 A method of assigning PSCCHRBs based on associated interlaces within a single subchannel to which the present disclosure may be applied is shown.

[0052] Fig.26 A method of assigning PSCCHRBs based on associated interlaces within a single subchannel to which the present disclosure may be applied is shown.

[0053] Fig. 27 An SL channel to which the present disclosure can be applied is shown.

[0054] Fig.28 A second SCI resource assignment method to which the present disclosure can be applied is shown.

[0055] Fig.29 A second SCI resource assignment method to which the present disclosure can be applied is shown.

[0056] Fig.30 A second SCI resource assignment method to which the present disclosure can be applied is shown.

[0057] Fig.31 A method of assigning a second SCI to which the present disclosure can be applied is shown.

[0058] Fig.32 A method of assigning a second SCI based on a plurality of sub-channels to which the present disclosure can be applied is shown.

[0059] Fig.33 is a flow chart showing a PSCCH resource assignment method to which the present disclosure can be applied.

[0060] Fig.34 is a flow chart showing a PSCCH resource assignment method to which the present disclosure can be applied.

[0061] Fig.35 is a diagram showing a base station device and a terminal device to which the present disclosure can be applied. DETAILED DESCRIPTION

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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).

[0070] 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.

[0071] 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.

[0072] 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).

[0073] 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.

[0074] First, the physical resource structure of the NR system to which the present disclosure is applied will be briefly described.

[0075] Figure 1 An example of an NR frame structure according to an example of the present disclosure is shown.

[0076] 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, k = 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.

[0077] Reference Figure 1 , which may include a time structure of a frame for downlink / uplink (DL / UL) transmission, which may include T f =(Δf max 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.

[0078] 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.

[0079] [Equation 1]

[0080] T TA =(N TA +N TA,offset )T c

[0081] 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.

[0082] Figure 2 An NR resource structure to which the present disclosure is applicable is shown.

[0083] 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.

[0084] 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, NRB sc represents the number of subcarriers in each RB, and k represents the subcarrier index.

[0085] [Equation 2]

[0086]

[0088] 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.

[0089] 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.

[0090] Table 1 below shows an example of digital parameters supported by the NR system.

[0091] [Table 1]

[0092] 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

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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).

[0097] 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.

[0098] 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).

[0099] [Table 2]

[0100]

[0101] 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.

[0102] [Table 3]

[0103] 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.

[0104] 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.

[0105] [Table 4] SCS Time slot within 10ms Time slot within 10ms Symbols within 10ms 15kHz 10 20 140 30kHz 20 40 280 60kHz 40 80 560 120kHz 80 N / A 1120 240kHz 160 N / A 2240 480kHz 320 N / A 4480

[0107] 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.

[0108] 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.

[0109] 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.

[0110] [Table 5]

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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.

[0116] 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. NR SL 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.

[0117] 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.

[0118] Figure 3 The NR SL time slot structure to which the present disclosure can be applied is shown.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] 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).

[0123] 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.

[0124] 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.

[0125] [Table 6]

[0126] [Table 7] 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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.

[0135] 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.

[0136] [Table 8]

[0138] 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.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] [Table 9]

[0148] 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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.

[0153] 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.

[0155] 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.

[0156] 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.

[0157] 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.

[0158] 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.

[0159] 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.

[0160] [Equation 3]

[0161]

[0162] [Equation 4]

[0163]

[0164] [Equation 5]

[0165]

[0167] 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.

[0168] 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.

[0170] Fig.10 An interleaving-based RB resource assignment method applied to the present disclosure is shown. PUCCH / PUSCH transmission can be performed through RB resources assigned based on interleaving. Here, the reference point of the RB resources assigned 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 to this.

[0171] 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.

[0172] 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.

[0173] 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.

[0174] [Table 10]

[0175]

[0176] 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.

[0177] [Table 11]

[0179] 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.

[0180] 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.

[0181] 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.

[0182] [Table 12]

[0183]

[0184] 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 25us. Here, it may be considered to send feedback information about data transmission within a maximum of 16us. In view of the above, the defer period may measure whether the channel is available for at least 25us.

[0185] 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 9us 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.

[0186] 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 to be occupied. On the contrary, if the backoff counter value is not 0, the backoff counter value can be decremented, that is, reduced (S1140). Then, it can be determined whether the channel is idle in the next 9us time slot (S1150). Here, if the channel is idle in the 9us 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.

[0187] On the contrary, if the channel is not idle in the 9us time slot, the corresponding node can 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 can occupy the unlicensed band and can 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 can be as shown in Table 13 below.

[0188] [Table 13]

[0190] 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.

[0191] 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.

[0192] 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.

[0193] 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 25us 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 16us. In addition, type 2C transmission may be a type that applies a COT gap of 16us or less. For example, if the next transmission is at most 16us, idle sensing may not be required and type 2C may be applied.

[0194] [Table 14]

[0195]

[0196] 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.

[0197] [Table 15]

[0199] For example, Fig.13A 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 The following example shows a situation where C2 is set to 1 based on COT sharing, with a 16us gap, but is not limited thereto. Fig.13 , the TA value may be considered to ensure a 16us gap between downlink and uplink in the base station. For example, the C value may be set via RRC signaling. In addition, the CP extension for uplink transmission may be indicated in the uplink grant.

[0200] 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 9us before the COT. Here, Tx ms may be set to one of the values ​​from 1ms to 10ms. 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 16us.

[0201] 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 20us based on energy detection. In addition, for example, in the case of sending a control frame (e.g., ACK, block ACK) considering 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.

[0202] 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.

[0203] 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.

[0204] 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 receiving to sending within one COT may include the switching time of the transceiver and may not be longer than 16us. 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, by reducing the count depending on whether the channel is idle for each ECCA slot, the random backoff operation allows a counter value randomly selected within the contention window to occupy the channel when the value is 0.

[0205] 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.

[0206] [Table 16]

[0208] 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.

[0209] 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.

[0210] 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.

[0211] 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.

[0212] 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.

[0213] 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.

[0214] 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.

[0215] 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.

[0216] 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.

[0217] 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.

[0219] Fig.17 The time and frequency resources of the PSCCH to which the present disclosure is applicable are shown. A single side link time slot (SL time slot) may include a single automatic gain control (AGC) symbol. Here, the PSCCH may be sent on two or three OFDM symbols after the AGC symbol at the beginning of the time slot in the time domain. Moreover, the PSCCH may be configured as a single value in {10, 12, 15, 20, 25} PRBs in the frequency domain, which may be shown in Table 17 below.

[0220] Here, the configured frequency resources for PSCCH can be assigned within a single subchannel. In addition, PSCCH DMRS is present in all PSCCH symbols and, from a frequency perspective, can be present in every fourth resource element of the 12 REs within a single PRB, such as Fig.17 For example, it can be applied to PSCCH DMRS to reduce the impact of PSCCH transmission conflicts between UEs with different OCC codes in the frequency domain, and PSCCH can be assigned in the time / frequency domain, such as Fig.17 When sidelink communication is performed based on a sidelink unlicensed band, a method of performing transmission by assigning a PSCCH resource may be required, which will be described below.

[0221] [Table 17]

[0223] For example, at least one RBS may be configured in a resource pool within a single SL BWP. Here, the available PSCCH transmission resource area for PSCCH transmission of the Tx UE may be flexibly changed according to the channel access success state (LBT success state) required by each RBS (LBT BW) in the unlicensed band. In addition, for example, in order to meet the regulations required in the unlicensed band such as OCB and PSD, a subchannel with an "interleaved RB structure" or an interleaved RB structure may be configured in the resource pool, as described above. For example, considering the various conditions required for using the unlicensed band, the PSCCH resources need to use a structure different from that of the RB structure. Figure 3 The method to assign is described below.

[0224] The subchannel-based time resource and frequency resource configuration for SL communication may be as shown in Table 18 below. However, a method may be required to make the SL resource pool meet the unlicensed band regulations, and the following description is based on the case of performing interleaving-based transmission. However, it may not be limited to this.

[0225] [Table 18]

[0227] First SCI and second SCI resource assignment method

[0228] The relationship between CRB, interleaving index and subchannel index can be configured in various forms. For example, PSCCH resource assignment can be performed based on physical resources associated with a specific subchannel index indicated for SL communication within the PSSCH resource. As another example, PSCCH resource assignment can be performed based on physical resources associated with a specific interleaving index within the PSSCH resource indicated for SL communication. That is, PSCCH resource assignment can be performed based on a specific index of a subchannel or interleaving, which is considered to be a basic side link resource assignment structure. Alternatively, PSCCH resource assignment can be performed based on a PSCCH PRB configured in a specific subchannel or interleaving within the PSSCH resource indicated for SL communication. In the following, it is assumed that PSCCH resource assignment can be performed based on a basic resource assignment structure (e.g., subchannel or interleaving), regardless of which physical resource structure and resource index are applied in the SL unlicensed band. The PSCCH resource assignment method proposed below can be applied to the first SCI sent via the above-mentioned PSCCH. However, the PSCCH resource assignment method is not limited to the first SCI, and the assignment method for the second SCI resource in the PSSCH may be considered. The following is a description related thereto.

[0229] In detail, for example, the second SCI can be assigned for PSSCH / PSCCH transmission in a different OFDM symbol / frequency resource that does not overlap with a specific interleave / specific RB within a specific subchannel (i.e., within the same subchannel index / interleave index / RB), which is a frequency resource index determined for PSCCH transmission within the PSSCH resource region assigned for SL communication. In addition, for example, hereinafter, PSCCH can be assigned in the order of a specific SL carrier index (in the case of SL CA), a specific RBS, a specific subchannel index, and a specific interleave RB index, which will be described below. In addition, the second SCI can be assigned to a portion of an existing PSSCH region in at least one resource of the same carrier, RBS, subchannel, and interleave index as the resource region to which the PSCCH is assigned. A description related thereto is given below.

[0230] Although a resource assignment method for PSCCH assignment is described below for clarity of description, the following resource assignment method may be considered as a resource assignment method for transmitting the second SCI within a PSSCH in a selected resource region and may not be limited to a specific embodiment.

[0232] A resource assignment method for blind monitoring of PSCCH

[0233] A UE operating in a SL unlicensed band may be configured to perform SL control signals and data transmission and reception based on an interlaced RB structure based on a higher layer configuration. As another example, a UE operating in a SL unlicensed band may be preconfigured to perform SL control signals and data transmission and reception in interlaced RBs based on the provisions of the unlicensed band. That is, the UE may perform SL control signals and data transmission and reception in interlaced RBs based on a higher layer configuration or a predetermined configuration. The configuration information may be provided via higher layer signaling from the base station, and if there is no such information, the configuration information may be preconfigured in the UE independently for each carrier / BWP or resource pool.

[0234] In addition, at least one RBS corresponding to the LBT bandwidth in the unlicensed bandwidth can be configured to exist within a single resource pool. Here, the RBS and resource pool configuration can be provided from the base station to the SL UE through higher layer (e.g., RRC, MAC) signaling. As another example, preconfiguration parameters (i.e., predefined parameters) can be provided in advance based on values ​​stored in the UE and then applied. For example, when preconfiguration parameters (i.e., predefined parameters) are provided in advance based on values ​​stored in the UE and then applied, when the UE is connected to the network (e.g., NR, LTE), the preconfiguration parameters can be replaced with new parameter values ​​through higher layer signaling of the base station, and the new parameter values ​​can then be applied, which is not limited to a specific embodiment.

[0235] Here, for example, PSCCH resources may be restricted and assigned within each RBS, regardless of whether the LBT performed in multiple RBSs is successful and the associated PSSCH resource assignment. In more detail, the Rx UE may verify the PSSCH resource assignment information based on SCI (PSCCH) detection, and may receive the PSSCH through it. Here, although the Rx UE receives the PSSCH through multiple consecutive RBSs, no problem occurs. On the other hand, when the Rx UE attempts to decode the PSCCH, the Rx UE may not pre-verify the subchannel / interlace and RBS through which the PSCCH is received, and the PSCCH may be verified by blind decoding. Therefore, the UE may need to perform blind decoding in all SL resource pools. In the case of an SL resource pool in an unlicensed band, the range of PSSCH transmission frequency resources can be flexibly changed according to which RBS LBT is successful among multiple RBSs within the SL resource pool. In addition, for example, as described above, there may be a guard band between two adjacent RBSs. When the resource pool includes two adjacent RBSs, the PRBs within the guard band can be used as resources within the resource pool for SL communication. That is, the resource pool can use not only the PRBs within two adjacent RBSs, but also the PRBs within the guard band existing therebetween as resources for SL communication. Therefore, from the perspective of the Tx UE, it can be determined whether to use the frequency resources within the guard band for at least PSSCH transmission and reception based on whether the LBT between the two adjacent RBSs is successful. For example, when the LBT of the two adjacent RBSs is successful, the guard band resources between the frequency resources within the guard band between the adjacent RBSs can also be used for PSSCH transmission based on at least one of the subchannels and interleaved RBs.

[0236] In detail, for example, Table 19 below may show a case where a resource pool configured in an Rx UE includes 4 RBSs. Each RBS configured in the resource pool may have a different LBT success status. Since the Rx UE may not verify in which RBS the LBT is successful before receiving the PSCCH, it is necessary to verify the PSCCH through blind decoding. Here, taking into account various resource utilization situations, the blind decoding combination for receiving the PSCCH may be as shown in Table 19 below. That is, taking into account the LBT success status in each RBS, there may be a problem of an increase in the blind decoding that the Rx UE needs to perform. A method for solving this problem may be required.

[0237] [Table 19]

[0239] Depending on the LBT success state, the range of physical resources within the resource pool including at least one subchannel or interleaving may be flexible. Therefore, as shown in Table 19, the blind decoding combination for verifying the PSCCH may increase, and based on this, the blind decoding complexity may increase, and the power consumption of the UE may increase. Taking this into account, the PSCCH resource assignment may be limited within each RBS. That is, the PSCCH resource assignment can be performed by limiting it to each RBS resource, regardless of whether two adjacent RBSs have succeeded in LBT.

[0240] Here, for example, if at least one RBS is configured within a single resource pool and LBT succeeds only in a single RBS, PSCCH and PSSCH transmissions can be performed within the RBS where LBT succeeds. That is, when only a single RBS among multiple RBSs within a resource pool configured based on the SL unlicensed band succeeds in LBT, the UE can perform PSCCH and PSSCH transmissions in the corresponding RBS.

[0241] On the other hand, the case where one or more adjacent (continuous) RBSs among multiple RBSs within the SL resource pool in LBT succeeds can be considered. Here, the PSCCH may be sent within a specific single RBS among one or more adjacent RBSs that are continued in the LBT success. That is, the PSCCH may be sent through a specific single RBS among multiple RBSs (hereinafter, option 1). Here, for example, the PSCCH may be sent through the RBS with the lowest or highest RBS index among the RBSs in which the LBT succeeded. As another example, the PSCCH may be sent through a specific RBS selected by the Tx UE from the RBSs in which the LBT succeeded in an implementation manner, and is not limited to a specific embodiment. Fig.18 A method for assigning PSCCH resources within a neighboring RBS according to an embodiment. As another example, all Tx UEs / Rx UEs may be configured by a higher layer to always perform PSCCH transmission in a specific RBS among the RBSs configured in the resource pool. In this case, the Tx UE has a condition to make LBT successful at least in the specific RBS for PSCCH transmission, but the Rx UE may have an advantage of not having to perform PSCCH monitoring in all RBSs. Fig.18 , the UE may transmit PSSCH 1811 and PSCCH 1812 to another UE through resources in a resource pool configured based on the SL unlicensed band. Here, RBS#0 1821 and RBS#1 1822 may be adjacent RBSs, and a guard band 1823 may exist between RBS#0 1821 and RBS#1 1822. For example, Fig.18A case where both the LBT of RBS#0 1821 and the LBT of RBS#1 1822 are successful may be considered. Here, the UE may perform transmission of PSCCH 1812 in RBS#0 1821 determined by the method, and may not perform transmission of PSCCH 1812 in RBS#1 1822. The UE may perform transmission of PSSCH 1811 and PSCCH 1812 in RBS#0 1821, and may transmit only PSSCH 1811 in RBS#1 1822. In addition, since the guard band 1823 between adjacent RBSs may be a resource within a resource pool, transmission of PSSCH 1811 may be performed through the corresponding resource.

[0242] That is, when LBT succeeds in adjacent (contiguous) RBSs within the resource pool of the SL unlicensed band, the UE can perform PSCCH transmission only in a specific single RBS among the RBSs that succeeded in LBT. For example, the specific single RBS may be the RBS with the lowest RBS index. As another example, the specific single RBS may be the RBS with the highest RBS index, or may be an RBS configured based on a certain condition, and is not limited to a specific embodiment. That is, PSCCH may be transmitted only through a specific single (partial) RBS among the RBSs where LBT succeeded.

[0244] As another example, when the LBT of at least one adjacent (continuous) RBS of multiple RBSs within the SL resource pool is successful, PSCCH can be sent in each of the one or more adjacent RBSs in which the LBT is successful. That is, PSCCH can be sent by each of the multiple RBSs (hereinafter, option 2). That is, when LBT is successful in an adjacent (continuous) RBS within the resource pool of the SL unlicensed band, the UE can perform PSCCH transmission within the frequency resources of the RBS in which LBT is successful. Here, PSCCH processing can be performed by channel coding and rate matching based on the amount of PSCCH transmission resources assigned in a single RBS. For example, the amount of PSCCH transmission resources can be the number of interleaved RBs and the number of OFDM symbols to be configured by higher layer parameters, but may not be limited thereto. That is, PSCCH processing can be performed based on the PSCCH transmission resources assigned in a single RBS. The PSCCH sent on another RBS can be redundantly sent by copying the aforementioned PSCCH. That is, the PSCCH sent on each RBS can be copied and sent as the same PSCCH. In addition, for example, all frequency resource-related indexes and positions of the PSCCH within the RBS may be the same. As another example, the frequency resource-related index and position of the PSCCH may be determined based on the preconfiguration and offset value of each RBS. For example, the frequency resource-related index and position of the PSCCH may be determined based on the RBS with the lowest index in the RBS where the LBT is successful, and the above-mentioned offset may be determined according to the RBS index. That is, the frequency resource-related index and position of the PSCCH may be determined in the RBS with the lowest index, and in another RBS, the frequency resource shifted by the offset determined according to the RBS index may be assigned, but may not be limited thereto. As another example, PSCCH channel coding and rate matching may be performed taking into account the total amount of PSCCH resources sent in the successful RBS based on the same SCI. The corresponding method may have the advantage of being able to send more redundant channel code bits to the Rx UE than the above-mentioned method, thereby additionally improving the reception performance. In addition, as described above, the PSSCH may be sent through resources in the protection band between the RBS where the LBT is successful and the RBS adjacent thereto.

[0245] Fig.19 A method for assigning PSCCH resources in neighboring RBSs according to an embodiment. Fig.19 , the UE may transmit PSSCH 1911 and PSCCH 1912 to another UE through resources in a resource pool configured based on the SL unlicensed band. Here, RBS#0 1921 and RBS#1 1922 may be adjacent RBSs, and a guard band 1923 may exist between RBS#0 1921 and RBS#1 1922. For example, Fig.19 A case where both the LBT of RBS#0 1921 and the LBT of RBS#1 1922 are successful may be considered. Here, the UE may perform transmission of PSCCHs 1912 and 1913 in RBS#0 1921 and RBS#1 1922. Here, PSCCH 1913 transmitted in RBS#1 1922 may become a PSCCH by duplicating PSCCH 1912 transmitted in RBS#0 1921. The UE may perform transmission of PSSCH 1911 in RBS#0 1921, RBS#1 1922, and the guard band 1923.

[0246] As another example, the method of duplicating and transmitting the PSCCH within each RBS may vary depending on a higher layer configuration. For example, information indicating PSCCH duplication and transmission may be configured according to a higher layer configuration. If the corresponding information indicates PSCCH duplication and transmission, the PSCCH may be duplicated and transmitted within each RBS. In detail, when a configuration indicating PSCCH duplication and transmission exists, the UE may duplicate and send the PSCCH in each RBS that succeeds in the LBT (Option 2). On the contrary, when a configuration indicating PSCCH duplication and transmission does not exist, the PSCCH may be sent (fallback) through a specific single RBS index (e.g., the lowest RBS index among the RBSs where channel occupancy is successful) even though the LBT is successful on multiple RBSs (Option 1).

[0247] As another example, when LBT is successful on a neighboring RBS, an operation in which the PSCCH is transmitted through a single RBS (option 1) or an operation in which the PSCCH is replicated and then transmitted through each RBS (option 2) may be indicated by at least one of the SCI and the MACCE. In addition, for example, the above operations may be preconfigured. As another example, when there is no specific configuration or signaling, a specific operation in the above operations may be configured as a default operation (e.g., option 1), but is not limited to a specific embodiment.

[0249] Moreover, for example, four RBSs may be configured in a single resource pool. However, this is only for describing a clear example and is not limited to the above embodiments. In addition, for example, the interleaving index and the subchannel index may be assigned based on a 1:1 relationship, but are not limited thereto. Here, the UE may independently perform the LBT process for each band corresponding to each RBS in the unlicensed band. Here, based on the LBT execution result, the PSCCH / PSSCH resource regions may be different. For example, resource assignment may be performed based on continuous subchannels in the SL unlicensed band. As another example, in addition to the continuous subchannel-based resource assignment method in the SL unlicensed band, an interleaving-based resource assignment may also be configured or defined. Here, it may be applied to meet regulations such as the above-mentioned PSD / OCB for the unlicensed band, but may not be limited to a specific embodiment.

[0250] Therefore, when at least one subchannel is scheduled within a single RBS, PSSCH resources (e.g., subchannel units) can be assigned at a constant frequency interval (e.g., every M interlaces) over the entire frequency band within the RBS. The following description is based on the case where SL transmission and reception are performed in adjacent RBSs. Here, as described above, when consecutive RBSs occupy a channel, resources in the guard band between the RBSs can be utilized. Therefore, since the UE can perform SL transmission on as many consecutive frequency resources as possible, frequency utilization efficiency and transmit power efficiency can be improved. The following description is based on the case where SL transmission is performed in consecutive adjacent RBSs, but may not be limited to this.

[0251] Fig. 20 FIG. 2 shows a case where multiple RBSs are configured in a single resource pool according to an embodiment. Fig. 20, the UE can succeed in LBT in RBS#0 2010. The UE can use the relevant #0 and #1 within RBS#0 2010 for PSCCH / PSSCH transmission. Here, the PSCCH resource assignment can be restricted within each RBS to minimize blind decoding and power consumption. That is, the Tx UE can determine according to the proposed method so that the PSCCH is assigned only to RBS#0 2010. Here, the Rx UE can perform blind detection on each subchannel assigned within each RBS excluding the guard band among the four RBSs 2010, 2020, 2030 and 2040 configured in the resource pool for PSCCH reception. As another example, the Rx UE can perform blind detection on each interlace associated with each subchannel assigned within each RBS excluding the guard band among the four RBSs 2010, 2020, 2030 and 2040 configured in the resource pool for PSCCH reception. That is, the Rx UE can perform PSCCH reception without increasing the complexity of blind detection regardless of the LBT result performed by the Tx UE. As another example, as described above, when the PSCCH is configured to be transmitted only in a specific RBS according to the proposed method, the Rx UE can perform blind decoding for PSCCH reception only in a specific RBS among the configured RBSs.

[0252] Fig.21 and 22 FIG. 2 shows a case where multiple RBSs are configured in a resource pool according to an embodiment. Fig.21 , LBT is successful in two adjacent RBSs (i.e., RBS#0 2110 and RBS#1 2120), which is consistent with Fig. 20 Different. Here, since the Rx UE cannot identify information about whether the LBT of the Tx UE is successful, the Rx UE can perform blind detection assuming limited PSCCH transmission within the LBT BW (RBS). Here, for example, the Tx UE succeeds in LBT in two consecutive RBSs 2110 and 2120, but can perform PSCCH transmission only within a single specific RBS. Here, the PSCCH transmission resource can be the lowest interleaved RB associated with the lowest subchannel index within the RBS. However, this is merely an example, and the PSCCH transmission resource can be assigned to another specific subchannel index and another interleaved RB index.

[0253] As another example, refer to Fig. 22(a), the Tx UE may succeed in LBT in two consecutive RBSs 2210 and 2220, and may perform PSCCH transmission in each RBS. Here, the PSCCH transmission resource may be the lowest interleaved RB associated with the lowest subchannel index in each RBS. However, this is only an example, and the PSCCH transmission resource may be assigned to another specific subchannel index and another interleaved RB index.

[0254] As another example, see Fig. 22 (b), when at least one RBS is configured in the frequency and PSSCH transmission is performed in one or more adjacent RBSs, a method of sequentially assigning interleaved RBs associated with a specific identical subchannel index (e.g., the lowest subchannel index in the PSSCH scheduling subchannel) in the scheduled subchannel of the PSSCH between the adjacent RBSs of the PSCCH transmission can be applied. That is, unlike options 1 and 2 described above regarding blind decoding of the PSCCH, a single PSCCH can be sent in adjacent RBSs. Here, from the perspective of the Rx UE, the Rx UE may not know in advance in which RBS the LBT is successful and within which SL data transmission is performed by the Tx UE. Therefore, the complexity of blind decoding of PSCCH decoding may increase. However, since the constraints on PSSCH scheduling (where PSSCH scheduling requires at least larger resources than PSCCH transmission resources) may disappear, the aforementioned method can be applied with a compromise in mind.

[0255] In detail, for example, when LBT in RBS#0 2210 and RBS#1 2220 for PSSCH scheduling is successful, PSSCH transmission can be performed using a specific subchannel among the subchannels and associated interleaved RBs existing within RBS#0 2210 and RBS#1 2220 and between RBS#0 2210 and RBS#1 2220 (whether to use resources within the guard band between adjacent RBS#0 and 1 can be predetermined or configured). Here, PSCCH can be transmitted by assigning an interleaved RB associated with the lowest subchannel index corresponding to the number of PSCCH RBs in the subchannel assigned for PSSCH transmission within each RBS. That is, PSCCH RBs can be assigned between RBS#0 2210 and RBS#1 2220. For example, PSCCH RB resource assignment can be performed for PSCCH of each interleaved RB sequentially starting from the lowest frequency, but may not be limited to the corresponding embodiment.

[0256] Fig.23 and 24 FIG. 2 shows a case where multiple RBSs are configured in a resource pool according to an embodiment. Fig.23, the UE may succeed in LBT in three RBSs (RBS#1, RBS#2, and RBS#3) 2320, 2330, and 2340. Here, PSCCH / PSSCH transmission may be performed in the lowest RBS among the RBSs (2320, 2330, and 2340) in which LBT succeeds. In addition, PSCCH transmission resources may be assigned starting from the lowest subchannel index within the RBS and the lowest interleaved RB index associated with the lowest subchannel index.

[0257] On the other hand, reference Fig.24 , the UE may succeed in LBT in three RBSs (RBS#1, RBS#2, and RBS#3) 2420, 2430, and 2440. Here, PSCCH / PSSCH transmission may be performed in each of the RBSs 2420, 2430, and 2440 in which LBT succeeds. PSCCH transmission resources may be assigned starting from the lowest subchannel index within each RBS and the lowest interleaved RB index associated with the lowest subchannel index.

[0258] That is, when LBT succeeds in consecutive RBSs (i.e., when LBT succeeds in one or more consecutive RBSs), PSSCH transmission resources can be sent by additionally using resources within the RBS where LBS succeeds and frequency resources present in the guard band between adjacent RBSs where LBS succeeds. On the other hand, PSCCH transmission resources can be assigned only within each RBS frequency resource within the actually scheduled PSCCH resource area, which is different from the PSSCH resource assignment method. Thus, an increase in blind decoding and an increase in power consumption can be prevented.

[0260] PSCCH resource assignment considering subchannels / interleaved RBs

[0261] For example, a subchannel may be configured by discontinuous interleaving RBs, and a PSCCH resource assignment method may be required in a subchannel based on discontinuous interleaving RBs. Here, the resource assignment method may be performed within a slot including a subchannel interleaving RB unit for PSCCH resource assignment, but may not be limited thereto.

[0262] For example, as described above, the radio resources used for PSCCH transmission may be determined as a specific single RBS among the RBSs where LBT is successful, or may be determined within each RBS based on the LBT success status of the RBSs within a resource pool.

[0263] Below, it is described which resource in the scheduled resources is used to perform PSSCH transmission. Here, for example, Table 20 and Table 21 show the number of subchannels per RBS based on the subcarrier spacing, the number of interlaces per subchannel, the number of interlaces (M), and the number of RBs per interlace (N), and consider Table 20 and Table 21 to describe the resources used for PSCCH transmission.

[0264] [Table 20]

[0265]

[0266] [Table 21]

[0267]

[0269] Subchannel and interleaved RB frequency resource assignments for PSSCH transmission may be provided to the Rx UE via SCI signaling. On the other hand, PSCCH frequency resources may be assigned based on higher layer parameters, which may be as shown in Table 17 above. For example, the parameter values ​​of Table 17 may be values ​​provided by higher layer parameters. For the number of PSCCH transmission RBs associated with the frequency domain, a single value in {10, 12, 15, 20, 25} PRB values ​​may be provided in advance and set in the UE. As another example, the number of PSCCH transmission RBs may be set to another value, and is not limited to a specific embodiment.

[0270] Here, for example, considering the number of PSCCH RBs, PSCCH assignment may be limited to the lowest single subchannel among the scheduled subchannels. However, as described above, considering unlicensed band operation, a method of assigning PSCCH in at least one subchannel may be considered instead of assigning PSCCH only in the lowest single subchannel among the scheduled subchannels. Here, for example, a method of assigning PSCCH in at least one subchannel may be considered based on the interleaving-based structure required in the unlicensed band and the above-mentioned provisions.

[0271] In detail, for the 20MHz unlicensed band / channel (LBT BW=RBS), the interleaved RB structure to be applied can be determined based on the SCS value and the PSD / OCB state. For example, the interleaved RB structure to be applied can be determined semi-statically. However, semi-statically applying the interleaved RB structure may reduce the flexibility of the configuration. The number of subchannels or the number of interleaved RBs per subchannel may be limited due to the interleaved RB structure, which may affect the granularity and flexibility of the scheduling assignment. On the other hand, for the number of RBs used for PSCCH transmission, the amount of resources can be determined by basically considering the PSCCH reception performance. Therefore, the main factor in determining the number of RBs can be the PSCCH coding rate, and the number of RBs for reliable PSCCH reception can be appropriately set. Taking the above into account, the PSCCH resource assignment method may be different from the existing method due to the structure and configuration in the unlicensed carrier, which will be described below.

[0273] For example, PSCCH resource assignment may be performed based on the number of PSCCH RB resources and the number of interleaved RBs per subchannel. In detail, a case where the number of interleaved RBs per subchannel is equal to or greater than the number of PSCCH RBs (hereinafter, case 1) and a case where the number of interleaved RBs per subchannel is less than the number of PSCCH RBs (hereinafter, case 2) may be considered. Here, for example, a case where PSCCH monitoring is preconfigured or determined by a higher layer to be performed in units of at least one subchannel may be considered.

[0274] In addition, as a basic frequency unit for blind decoding, a subchannel number unit greater than one can be set by a higher layer parameter of each resource pool. In detail, for example, a UE performing SL communication can assign PSCCH frequency resources within at least one of the lowest two subchannels and interleaving indices in the scheduled frequency resources for SL data transmission. Here, unlike the existing operation of performing blind decoding for each single subchannel, the Rx UE can perform blind decoding for PSCCH reception for every two subchannels. In this case, there may be a constraint that the resources for PSSCH transmission need to use at least two subchannels, but there is also the advantage of allowing more flexible PSCCH resource assignment.

[0275] Here, in case 1, the number of interleaved RBs per subchannel may be equal to or greater than the number of PSCCH RBs, and therefore, PSCCH may be assigned within a single subchannel. That is, RB resources for PSCCH transmission may be assigned to interleaved RBs included in the lowest single subchannel in the scheduled subchannels. Here, the lowest single subchannel is only a single example and may not be limited thereto. Another specific subchannel index may be used as a criterion.

[0276] On the other hand, in case 2, the number of interleaved RBs per subchannel is less than the number of RBs configured or determined for PSCCH transmission. That is, it may be a case where a greater number of PSCCH RBs than the number of interleaved RBs present in a single subchannel is required. Here, when PSCCH monitoring is preconfigured or determined by a higher layer to be performed in each or more subchannels, case 2 may be applied. In detail, for example, a case may be considered in which the number of interleaved RBs per subchannel is less than the number of PSCCH RBs required for reliable PSCCH reception. Referring to Tables 20 and 21 above, the number of interleaved RBs per subchannel may be 10 or 11. On the other hand, for the number of PSCCH RBs, a single value among 12, 15, 20, 25 PRBs may be set in the higher layer parameters of Table 17. That is, a case may be considered in which the number of PSCCH RBs is greater than the number of interleaved RBs per subchannel. Since successful PSCCH reception may require more RBs than the number of PSCCH RBs, there may be limitations when performing transmission based on a single subchannel.

[0277] For example, through higher layer parameters, the blind monitoring unit for PSCCH reception can be configured to have one or more subchannels for at least each resource pool. That is, the case where the blind monitoring unit for PSCCH reception is not a single subchannel can be considered. Here, for example, the PSCCH can be sent by sequential assignment of the subchannel index from the lowest subchannel index within the scheduled SL PSSCH resource to the subchannel index corresponding to the number of subchannels for the configured PSCCH monitoring. For example, PSCCH transmission can be performed by being assigned to the lowest two subchannel indices within the PSSCH resource area scheduled for SL data transmission. The Rx UE can verify the blind monitoring unit for PSCCH reception (i.e., the number of subchannel indices assigned for a single PSCCH) through higher layer parameters or predetermined values. Here, the resource unit can be the number of subchannels or the number of interleaved RBs, and can be provided as one or more possible values.

[0278] Hereinafter, a method of assigning PSCCH RB is described considering Case 1 and Case 2. For example, from the perspective of defining a wireless interface for SL transmission and reception in an unlicensed band, a new frequency resource assignment method needs to be defined, and is described at this point.

[0279] For example, PSCCH resource assignment may be performed within the RBS selected for the scheduled PSSCH transmission. The PSCCH may be set from the lowest interleaved RB index (one or more) included in the lowest subchannel index (one or more) within the RBS, and may be assigned to resources corresponding to the number of consecutive interleavings (or the number of RBs). As another example, PSCCH assignment may be performed from the highest subchannel index (one or more) or any subchannel index rather than the lowest subchannel index (one or more) / interleaved RB index (one or more) within the RBS, and is not limited to a specific embodiment. Here, when PSSCH / PSCCH is assigned to one or more subchannels, PSCCH may be assigned from the lowest subchannel to the subchannel corresponding to the configured monitoring quantity.

[0280] Fig.25 A method of assigning PSCCH RBs based on associated interlaces within a single subchannel according to an embodiment is shown.

[0281] Reference Fig.25 , subchannel index #0 may be scheduled for PSSCH transmission within a single RBS. Here, the number of interleavings per single subchannel may be one. Subchannel index #0 may be configured to be associated with an interleaving RB corresponding to interleaving index #0. Furthermore, a case may be considered in which the number of interleavings M is 10 and there are 10 interleavings within a single RBS. Furthermore, the number of RBs associated with a single interleaving index may be 10 (100RB / 20MHz). Here, a case in which the number of PSCCHs is 6 may be considered. That is, as in case 1 described above, it may be a case in which the number of PSCCH RBs is less than the number of interleaving RBs per subchannel. However, Fig.25 This is only an example for describing clarity and may not be limited to the above embodiments. Six PSCCHs may be assigned sequentially starting from the interleaving RB 2510 with the lowest subchannel / interleaving index within the PSCCH assignment resource. Since the number of interleaving RBs is greater than the number of PSCCH RBs, the number of PSCCH RBs may be assigned to the interleaving RBs respectively.

[0282] Here, for example, when assigning PSCCH resources within a single RBS, PSCCH resource assignment may be performed taking into account at least one of the number of PSCCH RBs, the number of interleavings per subchannel (K), the number of RBs per interleaving, and the number of interleavings (M). The UE may verify and set information about at least one of the number of PSCCH RBs, the number of interleavings per subchannel (K), the number of interleavings (M), the number of RBs per interleaving, the number of PSCCH assignment units, and the discontinuous PSCCH RB configuration state through higher layer parameters, which may be as shown in Table 22. The number of interleavings (M) may be determined based on the RBS size and SCS associated with the SL carrier / BWP in which the resource pool is configured without higher layer signaling configuration, which may be as shown in Tables 19 and 20 as described above. In addition, if there is no corresponding configuration, the number of PSCCH allocation units may be set to a single subchannel (or a single interleaving) as a default value. On the contrary, if there is a configuration for the number of PSCCH allocation units, the number of PSCCH allocation units may be determined differently according to the corresponding configuration. In addition, if there is no configuration for non-continuous PSCCHRB configuration state, the continuous interleaving index / RB can be configured as follows Fig.25 In contrast, if there is a configuration for a non-contiguous PSCCH RB configuration state, it can operate based on this, and will be described below. The interleaved RB assignment method can be applied to each RBS and executed.

[0283] [Table 22]

[0285] Here, the PSCCH resources can be performed based on the higher layer parameters of Table 22 and the scheduled PSSCH frequency resources. That is, the PSCCH RB assignment can be performed based on the higher layer parameters of Table 22 and the subchannel index (or interleaving index). Here, the PSCCH RB can be assigned starting from the lowest subchannel index and the lowest interleaving RB associated with the lowest subchannel index. In addition, the PSCCH RB can be continuously assigned to the same interleaving index RB starting from the lowest frequency RB within the lowest interleaving RB index. Here, if the number of PSCCH RBs is greater than the number of RBs within the lowest subchannel / interleaving, the same number of PSCCH RBs as the number of PSCCH RBs can be assigned starting from the lowest RB within the subsequent subchannel / interleaving index. In addition, if the number of PSCCH RBs is greater than the number of all interleaving RBs associated with a single subchannel, the PSCCH RB can be assigned after the subsequent lowest subchannel index among the PSSCH resources scheduled within the same RB. That is, considering the complexity of PSCCH blind decoding of Rx UE, PSCCH can be assigned within the lowest index in the subchannel to which the scheduled PSSCH is assigned. However, if the number of subchannels assigned to PSSCH is greater than one and the number of RBs within a single subchannel is less than PSCCH, PSCCH can be assigned in the same manner starting from the interleaved RBs within the subsequent subchannels. In addition, as another method, when PSSCH is scheduled in at least one RBS as described above, PSCCH can also be assigned between adjacent RBSs according to a higher layer configuration using the proposed assignment method.

[0287] Likewise, for example, the PSCCH may be sent within the RBS selected for the scheduled PSSCH transmission. Here, the PSCCH resources may be assigned to resources corresponding to the number of configured non-continuous interleavings (or the number of RBs) starting from the lowest interleaving RB included in the lowest subchannel. For example, the PSCCH may be assigned from both ends of the RBS in the associated interleaving RBs within the subchannel corresponding to the PSCCH transmission resources.

[0288] Fig.26 A method for assigning PSCCH RBs based on correlated interleaving within a single subchannel according to one embodiment is shown. Fig.26 , the PSCCH may be sent within the RBS selected for the scheduled PSSCH transmission. Here, the PSCCH resources may be assigned in the associated interlaced RBs within a particular subchannel (e.g., the lowest subchannel index). However, the mapping order of the PSCCH resources may be different from Fig.25For example, in order to maximize the PSCCH frequency diversity gain, considering the number of PSCCH RBs, PSCCH resources may be assigned to PSCCH RBs from both ends of the RBS frequency.

[0289] For details, refer to Fig.26 (a), based on a specific subchannel index within the RBS, as many resources as the number of PSCCH RBs may be assigned to maintain the interval with the associated interleaved RBs present at both ends of the frequency (hereinafter referred to as Option 1). As another example, as many resources as the number of PSCCH RBs may be assigned starting from the associated interleaved RBs present at both ends of the frequency based on a specific subchannel index within the RBS (hereinafter referred to as Option 2). That is, Fig.25 In comparison, Fig.26 In , the assignment order between interlace RBs within a single subchannel can be configured differently to maximize the PSCCH frequency diversity gain, rather than assigning PSCCH to RBs in consecutive interlaces. Other configurations can be used with Fig.25 Here, if the number of subchannels assigned to PSSCH is greater than one, and the number of RBs within a single subchannel is less than that of PSCCH, then Fig.26 The method additionally performs PSCCH assignment starting from interleaved RBs within subsequent subchannels.

[0291] The method for PSSCH assignment in the frequency domain is described above. Here, the number of OFDM symbols used to perform PSCCH transmission in the time domain can be determined for each PSCCH transmission time slot according to the higher layer configuration. In addition, in the PSCCH assignment in the time domain, the starting OFDM symbol position can always be assigned to a set number of symbols from the second symbol, regardless of whether the AGC symbol exists. As another example, the starting OFDM symbol position of the PSSCH transmission can be flexibly changed according to the presence status of the AGC symbol of each time slot. In detail, for example, in the case of a time slot without an AGC symbol, the PSCCH transmission can be assigned and performed starting from the first OFDM symbol of the time slot. For example, in the case where the PSSCH / PSCCH transmission is performed through continuous time slots in the side link of the unlicensed band, the presence status of the AGC symbol can be sent and changed with a signal. Taking the above into account, the PSCCH assignment in the time domain can also be changed as described above.

[0292] In addition, the starting OFDM symbol of the PSCCH transmission symbol can be determined based on whether sub-slot-based sidelink transmission and reception (sub-slot-based SL communication) is applied. That is, unlike the existing sidelink transmission and reception structure that performs slot-based sidelink transmission and reception, if data transmission and reception is applied based on sub-slot units in the sidelink unlicensed band (SL-U), the PSCCH / PSSCH transmission can start from the middle or specific OFDM symbol index of the sidelink slot. In this case, the PSCCH starting OFDM symbol can also be determined based on the above-mentioned configuration, scheduling, and LBT results and used as a specific OFDM symbol.

[0293] Here, the PSCCH transmission method in the time domain can be applied together with the PSCCH transmission in the frequency domain described above, and may not be limited to a specific PSCCH transmission method. That is, the PSCCH transmission method in the time domain may not be limited to a specific method in the PSCCH transmission method in the frequency domain described above, and may be applied to each PSCCH transmission method in the frequency domain.

[0295] Second SCI mapping method

[0296] Fig. 27 FIG. 4 shows an SL channel according to an embodiment. Fig. 27 (a), the first SCI can be sent via PSCCH. Fig. 27 (b), the second SCI may be assigned and sent together with the SL-SCH (SL data) within the PSSCH resource. Fig. 27 (c) HARQ feedback can be sent via the physical sidelink feedback channel (PSFCH). Fig. 27(d), the S-MIB may be sent via a physical sidelink broadcast channel (PSBCH). Here, the second SCI may not be assigned to resources assigned to signals (e.g., SL CSI-RS, PT-RS, DMRS, SL synchronization signals, PSBCH, PSFCH, PSCCH) for other SL transmission and reception. The second SCI mapping may be performed taking into account the above-mentioned PSSCH / PSCCH assignment method. For example, the second SCI may be sent within an RBS determined for the PSCCH and may be sent based on the same subchannel and at least one of the interleaved RBs. Here, the second SCI may not be assigned to the same resource element (RE) and may be assigned to a specific resource within the physical resource region in which the PSSCH is scheduled. For example, as described above, the second SCI may not be assigned to resources to which DMRS, PT-RS, CSI-RS or PSCCH for the side link are assigned within a single time slot. Therefore, the assignment can be performed in the remaining resource area except the resource area where the DMRS, PT-RS or PSCCH is assigned in the physical resource area determined for the PSSCH transmission. That is, the second SCI can be assigned and sent together with the PSCCH in the same resource as the RBS, subchannel or interleaved RB to which the PSCCH is assigned.

[0297] For example, the second SCI can be assigned within the associated subchannel based on the assignment method within the remaining scheduled resources according to the PSCCH assignment method. In detail, the second SCI can be assigned starting from the REs excluding the resources used for the associated DMRS, PT-RS, CSI-RS or PSCCH transmission, starting from the first PSSCH symbol and starting from the scheduled resource index. That is, the assignment can start from the REs within the interleaved RB except for the REs used for the associated DMRS, PT-RS, CSI-RS or PSCCH transmission. Here, considering at least one of the PSCCH, associated DMRS, PT-RS, CSI-RS assignment method and CRB-interlace-subchannel frequency configuration, the second SCI resource assignment can be performed within the subchannel or interleaved RB according to different methods.

[0298] Fig.28 A second SCI resource assignment method according to an embodiment is shown. Fig.28, PSCCH (first SCI) can be assigned from the lowest interleaved RB associated with a single subchannel corresponding to the lowest subchannel index within the scheduled resources. Here, according to the number of PSCCH RBs, as many PSCCH assignments as the number of consecutive interleaved RB indexes can be performed sequentially. Here, if there are interleaved RBs and REs to which PSCCH is not assigned in the same OFDM symbol, the second SCI can be assigned starting from the corresponding resources. The second SCI can be assigned sequentially in the order of interleaved RBs within the relevant subchannel starting from the above resources. That is, it can be assigned from low-frequency REs to high-frequency REs.

[0299] Fig.29 and 30 A second SCI resource assignment method according to an embodiment is shown.

[0300] Reference Fig.29 and 30 , PSCCH assignment can be performed based on the above method 2. For example, PSCCH resources can be assigned sequentially from both ends of the frequency starting from the lowest subchannel index / lowest interleaving index within the scheduled resources. When PSCCH is assigned and the RB / RE used for the second SCI assignment exists in the same subchannel / interleaving / OFDM symbol to which PSCCH is assigned in the physical resource (where PSSCH is scheduled), the second SCI can be assigned starting from the lowest frequency RB / RE among the corresponding RB / RE. Then, the second SCI can be assigned sequentially in subsequent OFDM symbols. Here, the second SCI assignment method can be based on at least one of the above methods 1 and 2 to perform assignment starting from the first RB / RE within the first OFDM symbol within the scheduled physical resource, which is an assignment method proposed for PSCCH assignment.

[0301] In detail, for example, refer to Fig.29 , the PSCCH can be assigned sequentially from both ends of the frequency, starting from the lowest subchannel index / lowest interleaving index within the scheduled resource. On the other hand, the second SCI can be assigned sequentially starting from the lowest subchannel index / lowest interleaving index within the resource to which the PSCCH is scheduled. In addition, referring to Fig.30 , starting from the lowest subchannel index / lowest interleaving index within the resource to which the PSCCH is scheduled, all PSCCHs and the second SCI can be assigned sequentially from both ends of the frequency. For example, the assignment of the PSCCH can be performed starting from the lowest subchannel index / lowest interleaving index based on one of the proposed methods, and then its transmission can be performed in the resources within the corresponding index available in the same OFDM or subsequent OFDM symbol for the second SCI assignment.

[0302] also, Fig.31A method for assigning a second SCI according to an embodiment is shown. Fig.31 , PSCCH assignment and the second SCI assignment may only apply time division multiplexing (TDM). Here, the second SCI may be performed from the subsequent OFDM symbol to which the PSCCH is assigned within the scheduling resource. Here, the second SCI assignment may be performed based on one of the above-mentioned PSCCH assignment methods.

[0303] As another example, the case where PSCCH and second SCI assignment are performed in multiple subchannels can be considered. For example, PSCCH can be assigned in multiple subchannels based on a higher layer configuration or as predetermined. Here, Fig.32 A method for assigning a second SCI based on a plurality of sub-channels according to an embodiment is shown. Fig.32 , for PSCCH assignment, as many assignments as the number of PSCCH interlace index RBs can be performed in two subchannels. Fig.32 , it is possible to consider scheduling subchannel #0 and subchannel #1 within the PSSCH resource region. Here, sequential frequency domain assignment can be performed first starting from the first OFDM symbol, the lowest subchannel index, and the lowest interleaved RB, and then the time domain assignment can be performed. Here, since the PSCCH assignment is performed within two subchannels in the frequency domain, two methods can be considered. For example, a method of assigning a subchannel index and then assigning subsequent subchannel index / interleaved RB index resources can be considered. That is, within the scheduled PSSCH resource region, the PSCCH and the second SCI resources can be assigned to the lowest subchannel index / interleaved RB index. Then, the PSCCH and the second SCI resources can be assigned in an order corresponding to the subchannel index / interleaved RB index. That is, the PSCCH and the second SCI resources can be assigned from the resources corresponding to the lowest subchannel index #0 / interleaved RB index #0 in the scheduled subchannel. If the RB for additional PSCCH assignment remains, the PSCCH and the second SCI resources can be assigned from the resources corresponding to the subsequent subchannel (subchannel #1 / interleaved RB index #1).

[0304] As another example, the PSCCH and the second SCI may be assigned to corresponding subchannel index / interleaved RB index resources based on the lowest frequency resource. That is, it may start from the lowest subchannel index / interleaved RB index within the scheduled PSSCH resource region. However, the PSCCH and the second SCI resource assignment may be performed in the order of multiple subchannels / interleaved RBs as a PSCCH resource assignment unit starting from the lowest frequency resource in the frequency domain, rather than in the order of resources corresponding to the subchannels or interleaved RBs. For details, refer to Fig.32, the PSCCH assignment may preferentially start from the lowest subchannel index #0 (subchannel #0 / 1) within the scheduled resource region. That is, from the frequency domain perspective, the physical resources corresponding to the two lowest subchannel indices corresponding to the PSCCH assignment may be assigned sequentially starting from the lowest RB / RE index.

[0305] Fig.33 is a flow chart showing a PSCCH resource assignment method applied to the present disclosure.

[0306] Reference Fig.33 , the UE can obtain resource information on the sidelink unlicensed band of the single carrier bandwidth (S3310). Here, the resource pool information for 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. Then, the sidelink unlicensed band resource pool can be configured based on the resource pool configuration information of the sidelink unlicensed band (S3320). Here, at least one RBS can be configured in the resource pool of the SL unlicensed band, and the LBT success status of each RBS can be verified (S3330). Then, the PSCCH resource can be assigned to at least one RBS in which the LBT is successful, and the PSCCH transmission can be performed (S3340). Here, the PSCCH resource can be assigned only to a single RBS that is a specific RBS in at least one RBS in which the LBT is successful. For example, the specific RBS can be the RBS with the lowest RBS index in at least one RBS in which the LBT is successful, but is not limited to a specific embodiment. That is, the PSCCH resource can be included only in any one of the RBSs in which the LBT is successful. This can prevent an increase in blind decoding and an increase in power consumption.

[0307] As another example, a PSCCH resource may be assigned to each of at least one RBS in which LBT is successful. For example, the PSCCH resource may be determined based on a single RBS, and the same PSCCH may be assigned to other RBSs through PSCCH replication. Thus, an increase in blind decoding and an increase in power consumption can be prevented.

[0308] Fig.34 is a flow chart showing a PSCCH resource assignment method applied to the present disclosure.

[0309] Reference Fig.34, the UE can obtain resource information on the sidelink unlicensed band of the single carrier bandwidth (S3410). Here, the resource pool information for 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. For example, considering the CRB-to-sidelink interleaving index mapping relationship, the resource pool of the sidelink unlicensed band can be configured using interleaving-based RB resources. Moreover, the corresponding sidelink interleaving (multiple) can be mapped to a subchannel. Then, the sidelink unlicensed band resource pool can be configured based on the resource pool configuration information of the sidelink unlicensed band (S3420). Here, at least one RBS can be configured in the resource pool of the SL unlicensed band, and the LBT success status of each RBS can be verified. In addition, the UE can verify the number of PSCCH RBs, the number of interleavings per subchannel (K), and the number of interleavings (M) based on higher layer parameters (S3430). Moreover, the UE may verify at least one of the number of PSCCH assignment units and the discontinuous PSCCH RB configuration state based on higher layer parameters. Here, if there is no configuration for the number of PSCCH assignment units, the PSCCH may be assigned in substantially a single subchannel (or single interlacing) for the number of PSCCH assignment units, as described above. In addition, for example, as described above, the PSCCH RB may be assigned to the relevant interlaced RBs in a single subchannel continuously or discontinuously based on the discontinuous PSCCH RB configuration state. Here, if the configuration for the discontinuous PSCCH RB does not exist, the PSCCH RB may be configured to be continuously assigned to the associated interlaced RBs in a single subchannel as a default configuration, but is not limited thereto. PSCCH resources may be assigned from the lowest interlaced RB index in the lowest subchannel index included in the RBS where LBT is successful. That is, the UE may assign PSCCH resources (S3440) from a specific interlaced RBS index in a specific subchannel index included in the RBS determined according to higher layer parameters and the LBT success state. For example, the RBS for sidelink communication may be determined based on the LBT success status within the resource pool. Here, the PSCCH resource may be assigned based on a specific interleaved RBS index included in the lowest subchannel index within the RBS determined based on higher layer parameters and the LBT success status. As another example, the PSCCH resource may be assigned based on a specific interleaved RBS index included in the highest subchannel index or any subchannel index within the RBS determined based on higher layer parameters and the LBT success status, and is not limited to a specific embodiment.

[0310] As yet another example, PSCCH resources may be assigned to resources corresponding to the number of non-continuous interleavings resulting from the lowest interleaving RB index included in the lowest subchannel index within the RBS. For example, PSCCH resources may be assigned based on a specific subchannel index within the RBS to maintain equal spacing with associated interleaving RBs present at both ends of the frequency. As another example, as described above, PSCCH resources may be assigned to contiguous interleaving RBs starting from associated interleaving RBs present at both ends of the frequency based on a specific subchannel index within the RBS.

[0311] Fig.35 is a diagram showing a base station device and a UE device to which the present disclosure can be applied.

[0312] The base station device 3500 may include a processor 3520 , an antenna unit 3512 , a transceiver 3514 , and a memory 3516 .

[0313] The processor 3520 performs baseband-related signal processing and may include a higher layer processor 3530 and a physical layer processor 3540. The higher layer processor 3530 may process the operation of a medium access control (MAC) layer, a radio resource control (RRC) layer, or a higher layer thereof. The physical layer processor 3540 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 3520 may also control the operation of the base station device 3500 as a whole.

[0314] The antenna unit 3512 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.

[0315] The memory 3516 may store information processed by the processor 3520, software, an operating system, an application, etc. related to the operation of the base station device 3500, and may include components such as a buffer.

[0316] The processor 3520 of the base station 3500 may be configured to implement the operations of the base station in the examples described herein.

[0317] The UE device 3550 may include a processor 3570, an antenna unit 3562, a transceiver 3564, and a memory 3566. For example, here, the UE device 3550 may perform communication with the base station device 3500. As another example, here, the UE device 3550 may perform SL communication with another UE device. That is, the UE device 3550 used here refers to a device capable of communicating with at least one of the base station device 3500 and other UE devices, and is not limited to communicating with a specific device.

[0318] The processor 3570 performs baseband-related signal processing and may include a higher layer processor 3580 and a physical layer processor 3590. The higher layer processor 3580 may process the operation of the MAC layer, the RRC layer, or a higher layer. The physical layer processor 3590 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 3570 may also control the operation of the UE device 3550 as a whole.

[0319] Antenna unit 3562 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.

[0320] The memory 3566 may store information processed by the processor 3570, software, operating system, applications, etc. related to the operation of the UE device 3550, and may include components such as a buffer.

[0321] The terminal device 3550 according to the example of the present disclosure may be associated with a vehicle. For example, the terminal device 3550 may be integrated in a vehicle, may be located in a vehicle, or may be located on a vehicle. In addition, the terminal device 3550 according to the present disclosure may be the vehicle itself. In addition, the terminal device 3550 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 3550 to which the present disclosure may be applied may include various types of communication devices that support interactive services using side links for services such as Internet access, service execution, navigation, real-time information, autonomous driving, and safety and risk diagnosis. In addition, the terminal device 3550 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.

[0322] 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 3550 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 interpreted as limiting the application of the present disclosure.

[0323] In addition, the terminal device 3550 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 3550 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.

[0324] In addition, the terminal device 3550 according to the example of the present invention may include various types of communication devices that can perform cooperation using a side link to support interactive services. That is, the terminal device 3550 can be used not only as a collaborative device in the case of supporting interactive services by directly using a side link, but also can be used to support interactive services using a side link.

[0325] In addition, for example, the terminal device 3550 may obtain resource information on the side link unlicensed band of the single carrier bandwidth. Here, the resource pool information for the side link unlicensed band may be provided to the terminal device 3550 based on at least one of the RBS configuration / index information and the interleaving / subchannel-based configuration information. Then, the side link unlicensed band resource pool may be configured based on the resource pool configuration information of the side link unlicensed band. Here, at least one RBS may be configured in the resource pool of the SL unlicensed band, and the LBT success status of each RBS may be verified. Then, the PSCCH resource may be assigned to at least one RBS that succeeded in LBT, and PSCCH transmission may be performed. Here, the PSCCH resource may be assigned only to a single RBS that is a specific RBS in at least one RBS that succeeded in LBT. For example, the specific RBS may be the RBS with the lowest RBS index in at least one RBS that succeeded in LBT, but is not limited to a specific embodiment. That is, the PSCCH resource may be included only in any one of the RBSs that succeeded in LBT. Thus, the increase in blind decoding and the increase in power consumption can be prevented.

[0326] As another example, a PSCCH resource may be assigned to each of at least one RBS in which LBT is successful. For example, the PSCCH resource may be determined based on a single RBS, and the same PSCCH may be assigned to other RBSs through PSCCH replication. Thus, an increase in blind decoding and an increase in power consumption can be prevented.

[0327] The terminal device 3550 can obtain resource information on the side link unlicensed band of the single carrier bandwidth. Here, the resource pool information of the side link unlicensed band can be provided to the terminal device 3550 based on at least one of the RBS configuration / index information and the interleaving / subchannel-based configuration information. For example, considering the CRB to side link interleaving index mapping relationship, the resource pool of the side link unlicensed band can be configured using interleaving-based RB resources. Moreover, the corresponding side link interleaving (multiple) can be mapped to the subchannel. Then, the side link unlicensed band resource pool can be configured based on the resource pool configuration information of the side link unlicensed band. Here, at least one RBS can be configured in the resource pool of the SL unlicensed band, and the LBT success status of each RBS can be verified. In addition, the terminal device 3550 can verify the number of PSCCHRBs, the number of interleavings per subchannel (K), and the number of interleavings (M) based on higher layer parameters. In addition, the terminal device 3550 can verify at least one of the number of PSCCH assignment units and the discontinuous PSCCH RB configuration state based on higher layer parameters. Here, if there is no configuration for the number of PSCCH assignment units, then for the number of PSCCH assignment units, PSCCH can be assigned in essentially a single subchannel (or single interlacing), as described above. In addition, for example, as described above, PSCCH RBs can be continuously or discontinuously assigned to related interlaced RBs within a single subchannel based on discontinuous PSCCH RB configuration states. Here, if the configuration for discontinuous PSCCH RBs does not exist, the PSCCH RBs can be configured to be continuously assigned to associated interlaced RBs within a single subchannel as a default configuration, but is not limited thereto. PSCCH resources can be assigned from the lowest interlaced RB index in the lowest subchannel index included in the RBS where LBT is successful. That is, the terminal device 3550 can assign PSCCH resources from a specific interlaced RBS index included in a specific subchannel index within the RBS determined according to higher layer parameters and the LBT success status. For example, the RBS used for side link communication can be determined based on the LBT success status within the resource pool. Here, the PSCCH resources may be assigned based on a specific interleaved RBS index included in the lowest subchannel index within the RBS determined based on higher layer parameters and the LBT success status. As another example, the PSCCH resources may be assigned based on a specific interleaved RBS index included in the highest subchannel index or any subchannel index within the RBS determined based on higher layer parameters and the LBT success status, and is not limited to a specific embodiment.

[0328] As yet another example, PSCCH resources may be assigned to resources corresponding to the number of non-continuous interleavings resulting from the lowest interleaving RB index included in the lowest subchannel index within the RBS. For example, PSCCH resources may be assigned based on a specific subchannel index within the RBS to maintain equal spacing with associated interleaving RBs present at both ends of the frequency. As another example, as described above, PSCCH resources may be assigned to contiguous interleaving RBs starting from associated interleaving RBs present at both ends of the frequency based on a specific subchannel index within the RBS.

[0329] 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.

[0330] 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.

[0331] 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. Industrial Applicability

[0332] 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, by the UE, resource pool configuration information based on higher layer signaling from a base station; Based on the resource pool configuration information, verifying a channel occupation success status of at least one resource block set (RBS) in the resource pool; performing a physical sidelink control channel (PSCCH) transmission by assigning a PSCCH resource within the at least one RBS based on the channel occupation success status; as well as Perform sidelink communications with other UEs.

2. The method according to claim 1, wherein: When the PSCCH resource is assigned in at least one RBS in which the channel occupation is successful based on the channel occupation success status, the PSCCH resource is assigned in any one of the at least one RBS in which the channel occupation is successful.

3. The method according to claim 1, wherein: When the PSCCH resource is assigned in at least one RBS in which the channel is successfully occupied based on the channel occupation success status, the PSCCH resource is assigned to each of the at least one RBS in which the channel is successfully occupied, and The PSCCH is replicated and assigned to each of the at least one RBS in which the channel occupation is successful.

4. The method according to claim 1, wherein: When the PSCCH resources are assigned within the at least one RBS, the PSCCH resources are assigned to resources corresponding to the number of consecutive interlaces set starting from a lowest interlace RB in a lowest subchannel included in the RBS.

5. The method according to claim 1, wherein: When the PSCCH resources are assigned within the at least one RBS, the PSCCH resources are assigned to resources corresponding to the number of non-contiguous interlaces set starting from a lowest interlace RB included in a lowest subchannel within the RBS.

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