User device and method of operation thereof

Abstract

A method for configuring a sidelink resource pool in a terminal in a wireless communication system, the method comprising: receiving resource pool configuration information from a base station based on higher layer signaling by the terminal; transmitting sidelink control information to another terminal based on the resource pool configuration information; and performing sidelink communication with the other terminal, wherein the resource pool configuration information may be information based on a sidelink resource pool configuration of an unlicensed band.

Description

[Technical Field]

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

[0002] The International Telecommunication Union (ITU) is developing the International Mobile Telecommunication (IMT) framework and standards, and recently discussions for fifth-generation (5G) communications have been underway through a program called "IMT for 2020 and beyond."

[0003] To meet the requirements set out in "IMT for 2020 and beyond," the 3GPP (3rd Generation Partnership Project) NR (New Radio) system is currently discussing the support of various numerologies for time-frequency resource unit standards, taking into account various scenarios, service requirements, potential system compatibility, etc.

[0004] In addition, 5G communication can support the transmission of physical signals or physical channels through multiple beams to overcome poor channel conditions such as high path loss, phase noise, and frequency offset that occur at high carrier frequencies. This enables 5G communication to support applications such as enhanced Mobile Broadband (eMBB), massive Machine Type Communications (mMTC), and Ultra Reliable and Low Latency Communication (URLLC).

[0005] V2X communication, a communication method for exchanging or sharing information such as traffic conditions while communicating with road infrastructure and other vehicles while driving, can also be considered. V2X can include vehicle-to-vehicle (V2V), which refers to Long Term Evolution (LTE) / New Radio (NR)-based communication between vehicles, vehicle-to-pedestrian (V2P), which refers to LTE / NR-based communication between vehicles and personally carried devices, and vehicle-to-infrastructure / network (V2I / N), which refers to LTE / NR-based communication between vehicles and roadside units / networks. Here, roadside units (RSUs) can be transportation infrastructure entities implemented by base stations or fixed devices. For example, they can be entities that transmit speed notifications to vehicles. Summary of the Invention [Problem to be solved by the invention]

[0006] The technical problem of the present disclosure relates to a method and apparatus for performing sidelink (SL) communication in a wireless communication system.

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

[0008] The technical problem of the present disclosure relates to a method and apparatus for configuring an SL resource pool on an unlicensed spectrum based on RBS (resource block set) and interlace / subchannel.

[0009] The technical problem of this disclosure relates to a method and apparatus for allocating SL interlace indexes based on CRB (common resource block).

[0010] The technical problem of the present disclosure relates to a method and apparatus for mapping SL interlace indexes and subchannel indexes.

[0011] The technical problem of the present disclosure relates to a method and apparatus for indicating a configured SL resource pool on an unlicensed spectrum.

[0012] The technical problem of the present disclosure relates to a method and apparatus for configuring an SL resource pool on an unlicensed spectrum taking into account regional regulations.

[0013] The technical problems to be solved by the present disclosure are not limited to the above-mentioned technical problems, and other technical problems not mentioned will be clearly understood by a person having ordinary skill in the art to which the present disclosure pertains from the following description. [Means for solving the problem]

[0014] A method for configuring a sidelink resource pool in a terminal in a wireless communication system according to one embodiment of the present disclosure, comprising: a step of receiving resource pool configuration information from a base station based on higher layer signaling by the terminal; a step of transmitting sidelink control information (SCI) to another terminal based on the resource pool configuration information; and a step of performing sidelink communication with the other terminal, wherein the resource pool configuration information may be information based on a configuration of a sidelink resource pool in an unlicensed band.

[0015] In addition, the sidelink resource pool configuration information of the unlicensed band according to one embodiment of the present disclosure may include at least one of RBS (resource block set) configuration and index information, interlace configuration and index information, and subchannel configuration and index information based on one sidelink bandwidth part (SL BWP) in one carrier bandwidth.

[0016] Furthermore, a CRB (common resource block) to interlace index mapping and an interlace index to subchannel index mapping can be determined based on sidelink resource pool configuration information of an unlicensed band according to one aspect of the present disclosure.

[0017] Furthermore, the number of subchannels and RBS of resources in which PSSCH (physical sidelink shared channel) transmission is performed in the sidelink resource pool can be indicated based on the SCI according to one aspect of the present disclosure.

[0018] The number of subchannels of resources according to one aspect of the present disclosure can be determined to one of a plurality of values ​​based on at least one of the subcarrier spacing (SCS), the number of interlaces in the sidelink resource pool, and the subchannel-to-interlace allocation relationship. [Effects of the Invention]

[0019] According to the present disclosure, a method for performing sidelink (SL) communication in a wireless communication system can be provided.

[0020] According to the present disclosure, a method for configuring a SL resource pool on an unlicensed band can be provided.

[0021] According to the present disclosure, a method for configuring an SL resource pool on an unlicensed spectrum based on RBS and interlace / subchannel can be provided.

[0022] According to the present disclosure, a method for allocating SL interlace indexes based on CRB can be provided.

[0023] According to the present disclosure, a method for mapping SL interlace indexes and subchannel indexes can be provided.

[0024] According to the present disclosure, a method for indicating a configured SL resource pool on an unlicensed spectrum can be provided.

[0025] The present disclosure relates to a method and apparatus for configuring a SL resource pool on an unlicensed spectrum taking into account regional regulations.

[0026] The effects obtained by the present disclosure are not limited to the effects described above, and other effects not mentioned will be clearly understood by those having ordinary skill in the art to which the present disclosure pertains from the following description. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 1 is a diagram for explaining an NR frame structure to which the present disclosure can be applied. [Figure 2] FIG. 2 is a diagram illustrating an NR resource structure to which the present disclosure may be applied. [Figure 3] FIG. 3 is a diagram illustrating an NR sidelink slot structure to which the present disclosure can be applied. [Figure 4] FIG. 4 is a diagram illustrating NR sidelink frequencies to which the present disclosure can be applied. [Figure 5] FIG. 5 is a diagram illustrating an NR sidelink resource pool configuration to which the present disclosure can be applied. [Figure 6] FIG. 6 is a diagram illustrating unlicensed bands by region for NR sidelink communication to which the present disclosure can be applied. [Figure 7] FIG. 7 is a diagram illustrating 5 GHz unlicensed band usage to which the present disclosure may be applied. [Figure 8] FIG. 8 illustrates a method for increasing bandwidth taking into account PSD limitations to which the present disclosure may be applied. [Figure 9] FIG. 9 is a diagram showing a method for setting a guard band in consideration of a shared band within an intra-cell to which the present disclosure can be applied. [Figure 10] FIG. 10 is a diagram illustrating an interlace-based RB resource allocation method to which the present disclosure can be applied. [Figure 11] FIG. 11 is a diagram illustrating a method for performing a listen before talk (LBT) procedure in an unlicensed spectrum to which the present disclosure may be applied. [Figure 12] FIG. 12 is a diagram illustrating COT sharing and discovery burst transmission to which the present disclosure can be applied. [Figure 13] FIG. 13 is a diagram illustrating a method for applying a CP extension to an uplink when performing COT sharing between a downlink and an uplink to which the present disclosure may be applied. [Figure 14] FIG. 14 is a diagram illustrating a semi-static channel connection procedure to which the present disclosure can be applied. [Figure 15] FIG. 15 is a diagram illustrating a method for performing channel occupation to which the present disclosure may be applied. [Figure 16] FIG. 16 illustrates a method for configuring RBS with BWP and resource pool in a sidelink unlicensed spectrum to which the present disclosure may be applied. [Figure 17] FIG. 17 is a diagram illustrating a method for configuring a resource pool for a sidelink unlicensed band to which the present disclosure can be applied. [Figure 18] FIG. 18 illustrates a frequency resource-based sidelink unlicensed band resource pool configuration using interlace allocation to which the present disclosure can be applied. [Figure 19] FIG. 19 illustrates a sidelink unlicensed band resource pool configuration method to which the present disclosure can be applied. [Figure 20] FIG. 20 is a diagram illustrating a case where subchannel indices are mapped to consecutive sidelink interlace indices based on a uniform CRB to interlace index relationship to which the present disclosure can be applied. [Figure 21]FIG. 21 is a diagram illustrating a case where the CRB-to-interlace index to which the present disclosure can be applied is non-uniformly assigned and the subchannel indexes are respectively mapped to consecutive sidelink interlace indexes. [Figure 22] FIG. 22 is a diagram illustrating a method of allocating subchannel indexes based on the interlace index within the lowest frequency interlace block within a resource pool to which the present disclosure can be applied. [Figure 23] FIG. 23 is a diagram illustrating a method for applying a block interleaver to which the present disclosure can be applied. [Figure 24] FIG. 24 is a diagram illustrating a method for setting non-uniform CRB-to-interlace indexes based on a combination of a block interleaver and a random function to which the present disclosure can be applied. [Figure 25] FIG. 25 is a diagram illustrating a method in which each subchannel index constituting one resource pool to which the present disclosure can be applied is mapped to non-consecutive sidelink indexes. [Figure 26] FIG. 26 is a diagram showing an interlace structure to which the present disclosure can be applied. [Figure 27] FIG. 27 is a diagram showing an interlace structure to which the present disclosure can be applied. [Figure 28] FIG. 28 illustrates a sidelink frequency resource allocation method to which the present disclosure can be applied. [Figure 29] FIG. 29 is a diagram illustrating a uniform interlace structure-based frequency resource allocation method to which the present disclosure can be applied. [Figure 30] FIG. 30 is a diagram illustrating a non-uniform interlace structure based frequency resource allocation method to which the present disclosure can be applied. [Figure 31] FIG. 31 is a flowchart illustrating a method for allocating sidelink unlicensed frequency band resources to which the present disclosure may be applied. [Figure 32] FIG. 32 is a diagram showing a base station apparatus and a terminal apparatus to which the present disclosure can be applied. DETAILED DESCRIPTION OF THE INVENTION

[0028] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The present disclosure will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can easily implement the present disclosure. However, the present disclosure may be embodied in various different forms and is not limited to the embodiments described herein.

[0029] In describing embodiments of the present disclosure, if it is determined that a detailed description of a known configuration or function would obscure the gist of the present disclosure, the detailed description will be omitted. In addition, in the drawings, parts that are not related to the description of the present disclosure will be omitted, and similar parts will be designated by similar reference numerals.

[0030] In this disclosure, when a component is said to be "coupled," "coupled," or "connected" to another component, this refers not only to a direct connection, but also to an indirect connection where there is another component between them. Furthermore, when a component is said to "include" or "have" another component, this does not exclude the other component, but means that the component may further include the other component, unless otherwise specified.

[0031] In this disclosure, terms such as first and second are used only to distinguish one component from another, and do not limit the order or importance of the components unless otherwise specified. Therefore, within the scope of this disclosure, a first component in one embodiment may be referred to as a second component in another embodiment, and similarly, a second component in one embodiment may be referred to as a first component in another embodiment.

[0032] In this disclosure, components that are distinguished from one another are used to clearly describe the characteristics of each component and do not necessarily mean that the components are separate. That is, multiple components may be integrated into a single hardware or software unit, or a single component may be distributed into multiple hardware or software units. Therefore, even if not otherwise specified, such integrated or distributed embodiments are also included within the scope of this disclosure.

[0033] In this disclosure, the components described in various embodiments are not necessarily essential components, and some may be optional components. Therefore, an embodiment consisting of a subset of the components described in one embodiment is also included in the scope of this disclosure. Note that an embodiment including other components in addition to the components described in various embodiments is also included in the scope of this disclosure.

[0034] The present disclosure describes a wireless communication network, and operations performed in the wireless communication network may be performed in a process of controlling the network and transmitting or receiving signals by a system (e.g., a base station) that manages the wireless communication network, or in a process of transmitting or receiving signals by a terminal coupled to the wireless network.

[0035] It is apparent that various operations performed for communication with a terminal in a network consisting of multiple network nodes including a base station may be performed by the base station or other network nodes other than the base station. The term "base station (BS)" may be replaced with terms such as fixed station, Node B, eNodeB (eNB), ng-eNB, gNodeB (gNB), access point (AP), etc. Furthermore, the term "terminal" may be replaced with terms such as user equipment (UE), mobile station (MS), mobile subscriber station (MSS), subscriber station (SS), non-AP station (non-AP STA), etc.

[0036] In this disclosure, transmitting or receiving a channel includes transmitting or receiving information or signals through the channel. For example, transmitting a control channel means transmitting control information or signals through the control channel. Similarly, transmitting a data channel means transmitting data information or signals through the data channel.

[0037] In the following description, the term NR (New Radio) system is used to distinguish the system to which various examples of the present disclosure are applied from existing systems, but the scope of the present disclosure is not limited by these terms.

[0038] The NR system supports various subcarrier spacings (SCS) taking into account various scenarios, service requirements, and potential system compatibility. The NR system can also support the transmission of physical signals / channels through multiple beams to overcome adverse channel conditions such as high path loss, phase noise, and frequency offset that occur at high carrier frequencies. This allows the NR system to support applications such as enhanced Mobile Broadband (eMBB), massive Machine Type Communications (mMTC) / ultra Machine Type Communications (uMTC), and Ultra Reliable and Low Latency Communications (URLLC).

[0039] Hereinafter, 5G mobile communication technology may be defined to include not only the NR system but also the existing LTE-A (Long Term Evolution-Advanced) and LTE (Long Term Evolution) systems. That is, 5G communication may include not only the newly defined NR system but also technologies that operate in consideration of backward compatibility with previous systems. Therefore, the 5G mobile communication described below may include technologies that operate based on the NR system and technologies that operate based on previous systems (e.g., LTE-A, LTE), and is not limited to a specific system.

[0040] First, a brief description will be given of the physical resource structure of the NR system to which the present invention is applied.

[0041] FIG. 1 is a diagram for explaining an NR frame structure to which the present disclosure can be applied.

[0042] The basic unit of time domain in NR is T c =1 / (Δf max N f ) and Δf max =480 10 3 and N f = 4096, whereas the time domain base unit in LTE is Ts = 1 / (Δf ref N f,ref ) and Δf ref =15 10 3 and N f,ref = 2048. The constant for the multiple relationship between the base unit of NR time and the base unit of LTE time is κ = T s / T c =64.

[0043] Referring to FIG. 1, the time structure of a frame for downlink / uplink (DL / UL) transmission is T f =(Δf max N f / 100)·T s= 10 ms, where one frame is T sf =(Δf max N f / 1000)·T s The number of consecutive OFDM symbols in each subframe is N subframe,u symb =N slot symb N subframe,u slot Also, each frame can be divided into two half frames of the same size, with half frame 1 consisting of subframes 0 to 4 and half frame 2 consisting of subframes 5 to 9.

[0044] N TA denotes the timing advance (TA) between the downlink (DL) and the uplink (UL), where the transmission timing of the uplink transmission frame i is determined based on the downlink reception timing at the terminal according to the following Equation 1:

[0045]

number

[0046] where N TA,offset is the TA offset value that occurs due to differences in duplex modes. TA,offset has a value of 0, but in TDD (Time Division Duplex), N is set to N in consideration of the margin for DL-UL switching time. TA,offset For example, in TDD (Time Division Duplex) in FR1 (Frequency Range 1), which is a frequency below 6 GHz, N TA,offset is 39936T C or 25600T C It can be. 39936T Cis 20.327μs, and 25600T C is 13.030μs. Also, at the millimeter wave (mmWave) frequency FR2 (Frequency Range 2), N TA,offset is 13792T C At this time, 39936T C is 7.020μs.

[0047] FIG. 2 is a diagram illustrating an NR resource structure to which the present disclosure may be applied.

[0048] The resource elements (REs) in the resource grid can be indexed by each subcarrier spacing, where one resource grid can be generated for each antenna port and each subcarrier spacing, and uplink and downlink transmission and reception can be performed based on the resource grid.

[0049] In the frequency domain, one resource block (RB) consists of 12 REs, and an index (n PRB ) can be configured. The index for the RB can be used within a specific frequency band or system bandwidth. The index for the RB can be defined as in Equation 2 below. Here, N RB sc denotes the number of subcarriers per RB, and k denotes the subcarrier index.

[0050]

number

[0051] Various neural networks can be configured to meet the various services and requirements of the NR system. For example, an LTE / LTE-A system can support one subcarrier spacing (SCS), while an NR system can support multiple SCSs.

[0052] New pneumatics for NR systems supporting multiple SCSs can operate in frequency ranges or carriers such as below 3 GHz, 3 GHz to 6 GHz, 6 GHz to 52.6 GHz, or above 52.6 GHz, solving the problem of not being able to use wide bandwidths in frequency ranges or carriers such as 700 MHz or 2 GHz.

[0053] Table 1 below shows examples of pneumoradio supported by the NR system.

[0054] [Table 1]

[0055] Referring to Table 1, the neural network parameters can be defined based on the subcarrier spacing (SCS), cyclic prefix (CP) length, and number of OFDM symbols per slot used in an Orthogonal Frequency Division Multiplexing (OFDM) system. These values ​​can be provided to the UE through upper layer parameters DL-BWP-mu and DL-BWP-cp for the downlink and through upper layer parameters UL-BWP-mu and UL-BWP-cp for the uplink.

[0056] In Table 1, when the subcarrier spacing setting index (u) is 2, the subcarrier spacing (Δf) is 60 kHz, and normal CP and extended CP can be applied. In other cases, only normal CP can be applied.

[0057] A normal slot can be defined as a basic time unit used to transmit one piece of data and control information in an NR system. The length of a normal slot can be basically set to 14 OFDM symbols. Furthermore, unlike a slot, a subframe has an absolute time length corresponding to 1 ms in an NR system and can be used as a reference time for the length of other time intervals. Here, for coexistence or backward compatibility between LTE and NR systems, a time interval similar to an LTE subframe may be required in the NR standard.

[0058] For example, in LTE, data may be transmitted based on a transmission time interval (TTI), which is a unit of time, and the TTI may be set in units of one or more subframes. Here, in LTE, one subframe may be set to 1 ms and may include 14 OFDM symbols (or 12 OFDM symbols).

[0059] Furthermore, non-slots can be defined in NR. A non-slot may refer to a slot having a number of symbols at least one smaller than that of a normal slot. For example, when providing low latency, such as in a URLLC service, the latency can be reduced by using a non-slot having a number of symbols smaller than that of a normal slot. Here, the number of OFDM symbols included in a non-slot can be determined taking into account the frequency range. For example, in a frequency range of 6 GHz or higher, a non-slot having a length of one OFDM symbol can be considered. As a further example, the number of OFDM symbols defining a non-slot can include at least two OFDM symbols. Here, the range of the number of OFDM symbols included in a non-slot can be set as the length of a mini-slot up to a predetermined length (e.g., the normal slot length minus 1). However, as a non-slot standard, the number of OFDM symbols may be limited to, but not limited to, 2, 4, or 7 symbols.

[0060] For example, in unlicensed bands below 6 GHz, subcarrier spacing where u is 1 and 2 can be used, and in unlicensed bands above 6 GHz, subcarrier spacing where u is 3 and 4 can be used. For example, when u is 4, it can be used for SSB (Synchronization Signal Block).

[0061] [Table 2]

[0062] Table 2 shows the number of OFDM symbols per slot (N) for normal CP, depending on the subcarrier spacing setting (u). slot symb ), number of slots per frame (N frame,u slot ), the number of slots per subframe (N subframe,u slot) Table 2 shows the above values ​​based on a normal slot having 14 OFDM symbols.

[0063] [Table 3]

[0064] Table 3 shows the number of slots per frame and the number of slots per subframe when extended CP is applied (i.e., when u is 2 and the subcarrier spacing is 60 kHz), based on a normal slot with 12 OFDM symbols per slot.

[0065] As mentioned above, one subframe may correspond to 1 ms on the time axis. Furthermore, one slot may correspond to 14 symbols on the time axis. For example, one slot may correspond to 7 symbols on the time axis. Therefore, the number of slots and symbols that can be considered within 10 ms, which corresponds to one radio frame, can be set differently. Table 4 shows the number of slots and symbols according to each SCS. In Table 4, the 480 kHz SCS may not be considered, but is not limited to these examples.

[0066] [Table 4]

[0067] V2X services (e.g., LTE Rel-14 V2X) can support basic requirements for V2X services. The requirements are primarily designed with road safety services in mind. Here, V2X User Equipment (UE) can exchange status information with each other through sidelink. Furthermore, V2X UE can exchange information with infrastructure nodes and / or pedestrians.

[0068] V2X services (e.g., LTE Rel-15) can support at least one of carrier aggregation, high order modulation, latency reduction, transmit diversity, and sTTI (Transmission Time Interval) in the sidelink. To this end, new features can be applied to V2X communication. Specifically, V2X UEs can operate while taking into account coexistence with other V2X UEs. For example, V2X UEs can use the same resource pool as other V2X UEs.

[0069] As an example, considering use cases for supporting V2X services in SA (System Aspect) 1, technical features can be classified into four categories as shown in Table 5 below, but are not limited to these. In Table 5, Vehicle Platooning can be a technology in which multiple vehicles dynamically form a group and operate in a similar manner. Extended Sensors can be a technology that collects and exchanges data obtained from sensors or video footage. Advanced Driving can be a technology in which vehicles drive based on full automation or semi-automation. Remote Driving can be a technology that provides technology and applications for remote control of vehicles, and more specific details of the above can be seen in Table 5 below.

[0070] [Table 5-1] [Table 5-2]

[0071] Furthermore, SA1 is an eV2X (enhanced V2X) support technology for supporting V2X services and can support cases where it operates in various systems (e.g., LTE, NR). As an example, a case can be considered in which the NR V2X system is a first V2X system and the LTE V2X system is a second V2X system. That is, the NR V2X system and the LTE V2X system can be different V2X systems.

[0072] Hereinafter, a method for achieving low latency and high reliability required for an NR sidelink will be described based on an NR V2X system. However, the same or similar configuration may be extended and applied to an LTE V2X system, and the present invention is not limited to the following embodiments. That is, the present invention may be applied to parts that are interoperable with an LTE V2X system.

[0073] Here, NR V2X capability is not necessarily limited to supporting only V2X services, and may optionally support the use of a certain V2X RAT.

[0074] Additionally, NR V2X services can additionally consider new service requirements for public safety and commercial use cases. For example, use cases may include, but are not limited to, at least one of more advanced V2X services, public safety services, NCIS (Network Controlled Interactive Service), MONASTERYEND (Gap Analysis for Railways), REFEC (Enhanced Relays for Energy eFficiency and Extensive Coverage), and AVPROD (Audio-Visual Service Production).

[0075] For the NR V2X, physical channels, signals, a basic slot structure, and physical resources can be configured. Here, the NR Physical Sidelink Shared Channel (NR PSSCH) can be a physical layer NR Sidelink (SL) data channel. V2X terminals can exchange data and control information (e.g., 2nd SCI, CSI) through the NR PSSCH. The NR Physical Sidelink Control Channel (NR PSCCH) is a physical layer NR SL control channel. The NR PSCCH is a channel for transmitting control information (1st SCI, Sidelink Control Information) including scheduling information for the NR SL data channel and a 2nd SCI indication. That is, a V2X terminal can transmit control information for sidelink data communication to another V2X terminal through the PSCCH. The NR Physical Sidelink Feedback Channel (NR PSFCH) is a channel for transmitting physical layer NR Hybrid Automatic Repeat Request (HARQ) feedback information and for transmitting HARQ-ACK feedback information corresponding to the NR SL data channel (i.e., PSSCH). After transmitting data to another V2X terminal, a V2X terminal can receive HARQ feedback information for the data via the NR PSFCH. The NR Sidelink Synchronization Signal / Physical Sidelink Broadcast Channel block (SLSS / PSBCH block) is a channel block in which an NR sidelink synchronization signal and a broadcast channel are transmitted over a continuous time period in the physical layer. Here, the SLSS / PSBCH block may be transmitted periodically based on a set of one or more block indexes to support beam-based transmission in the NR frequency band.The synchronization signal consists of a Primary Sidelink Synchronization Signal (PSSS) and a Secondary Sidelink Synchronization Signal (SSSS). The synchronization signal is generated in a sequence based on at least one SLSSID value. The NR Physical Sidelink Broadcast Channel (PSBCH) is a channel that carries system information required for V2X sidelink communication. The NR PSBCH is transmitted together with the SLSS and is periodically transmitted in the form of an aggregate of the SLSS / PSBCH block index to support beam-based transmission.

[0076] In addition, a physical sidelink control channel (PSCCH) and a physical sidelink shared channel (PSSCH) can be defined based on NR V2X. A terminal can transmit sidelink control information (SCI) to another terminal through the PSCCH. Here, a transmitting terminal can transmit a primary SCI (1st SCI, SCI format 1-A) to a receiving terminal through the PSSCH. In this case, the primary SCI can be used to schedule the PSSCH and the secondary SCI (2nd SCI) within the PSSCH, and the primary SCI can include at least one of priority information, time / frequency resource allocation information, resource reservation information, Demodulation Reference Signal (DMRS) pattern information, secondary SCI format indication information, beta-offset indicator information as a parameter for the secondary SCI and PSSCH rate matching operation, DMRS port number information, MCS (Modulation Coding Scheme) information, additional MCS table indicator information (e.g., indicating one of 64QAM, 256QAM, or URLLC MCS tables), PSFCH overhead indication information (a parameter for the 2nd SCI and PSSCH rate matching operation), and reserved bits.

[0077] FIG. 3 is a diagram illustrating an NR sidelink slot structure to which the present disclosure can be applied.

[0078] Referring to FIG. 3, one sidelink slot (SL slot) includes one automatic gain control (AGC) symbol. One SL slot also includes one transmit-receive (Tx-Rx) switching symbol. In one SL slot, the PSSCH, which is a channel for transmitting data, is transmitted through one or more subchannels (e.g., two subchannels in the case of FIG. 3). In addition, in the time domain, the remaining orthogonal frequency division multiplexing (OFDM) symbols, excluding the AGC symbol and the Tx-Rx switching symbol, may transmit the PSCCH (1st SCI), the secondary SCI, the PSSCH (Data), and a demodulation RS (DMRS) for demodulation. Specifically, the positions of the PSCCH (1st SCI), the secondary SCI, the PSSCH (Data), and the DMRS (Demodulation RS) for demodulation are as shown in FIG. 3, but are not limited thereto. For example, in Fig. 3, the first subchannel has a PSCCH and a secondary SCI, and the PSSCH and DMRS can be allocated taking this into consideration. As another example, the second subchannel in Fig. 3 is a subchannel without a PSCCH or a secondary SCI, and the PSSCH and DMRS can be allocated as shown in Fig. 3.

[0079] Here, the number of OFDMs for the PSSCH DMRS can be set to one or more depending on the channel environment of the terminal through higher layer configuration. The PSCCH (1st SCI) is decoded and received using the DMRS of the PSCCH (i.e., the PSCCH DMRS) and is transmitted by being evenly allocated to every four resource elements within one resource block (RB). On the other hand, the 2nd SCI is decoded using the PSSCH DMRS.

[0080] For example, one resource pool related to the NR sidelink can support all of frequency division multiplexing (FDM), time division multiplexing (TDM), and spatial division multiplexing (SDM). That is, each resource in one resource pool can be divided and used based on frequency, time, and space, thereby improving resource efficiency.

[0081] 4 is a diagram illustrating NR sidelink frequencies to which the present disclosure can be applied. For example, the NR sidelink can operate based on at least one of FR1 (Frequency Range 1, sub 6 GHz) and FR2 (Frequency Range 2, i.e., up to 52.6 GHz), unlicensed ITS bands, and licensed bands. As a specific example, referring to FIG. 4, 5,855 to 5,925 MHz can be allocated for ITS services (technology neutral manner).

[0082] Furthermore, NR V2X Quality of Service (QoS) requirements can be considered. That is, as requirements for NR V2X services, delay, reliability, and data rate must meet certain conditions. Here, the requirements can be set as shown in Table 6 below, and Table 7 can be a table showing PC5 QoS for NR V2X.

[0083] Here, to meet QoS requirements, access stratum (AS)-level QoS management may be necessary. For this purpose, HARQ and CSI feedback associated with link adaptation may be required. Furthermore, each NR V2X UE may have a different maximum bandwidth capability. In consideration of the above, NR V2X UEs may exchange AS-level information including at least one of UE capability, QoS-related information, radio bearer configuration, and physical layer configuration.

[0084] [Table 6]

[0085] [Table 7-1] [Table 7-2] [Table 7-3]

[0086] Next, the sidelink HARQ procedure will be described. Whether a V2X terminal reports HARQ feedback is indicated by higher layer (e.g., RRC) configuration and SCI signaling (e.g., 2nd SCI). For example, when a V2X terminal performs communication based on groupcast, it can determine whether to report HARQ feedback based on the distance between the transmitting terminal and the receiving terminal.

[0087] When a V2X terminal performs unicast and / or groupcast, it may enable or disable sidelink HARQ feedback, where the enable / disable of HARQ feedback may be determined based on at least one of channel conditions (e.g., RSRP), the distance between the transmitting terminal and the receiving terminal, and QoS requirements.

[0088] In the case of groupcast, whether to transmit HARQ feedback can be determined depending on the physical distance between the transmitting terminal and the receiving terminal. Here, when HARQ feedback is performed based on groupcast, the receiving terminal can operate to feed back a negative acknowledgment only when PSSCH decoding fails. This can be the operation of option 1. On the other hand, when HARQ feedback is performed based on groupcast, the receiving terminal can operate to feed back a positive or negative acknowledgment depending on whether PSSCH decoding is successful, which can be the operation of option 2. In the operation of option 1, which feeds back only a negative acknowledgment to the HARQ NACK based on groupcast, feedback for the PSSCH can be performed if the physical distance between the transmitting terminal and the receiving terminal is smaller than or equal to the communication range requirement. On the other hand, if the physical distance between the transmitting terminal and the receiving terminal is larger than the communication range requirement, the V2X terminal does not need to feed back PSSCH.

[0089] At this time, the location of the transmitting terminal is indicated to the receiving terminal through the SCI associated with the PSSCH. The receiving terminal can estimate the distance to the transmitting terminal based on the information included in the SCI and its own location information and operate as described above.

[0090] In addition, when performing unicast communication based on V2X, the case where sidelink HARQ feedback is enabled can be taken into consideration. The receiving terminal can generate and transmit HARQ ACK / NACK for PSSCH based on whether the corresponding TB (Transport Block) has been successfully decoded.

[0091] Next, the NR sidelink resource allocation mode includes a mode in which the base station schedules sidelink transmission resources. Here, the mode in which the base station schedules sidelink transmission resources may be Mode 1. For example, when a V2X terminal is located within the base station coverage, the V2X terminal may receive sidelink resource information from the base station based on Mode 1. On the other hand, there is also a mode in which the V2X terminal directly determines resources for sidelink transmission from sidelink resources configured by the base station / network or pre-configured sidelink resources. Here, the mode in which the terminal directly determines sidelink transmission resources may be Mode 2.

[0092] Also, the numerology and waveform for the sidelink may be considered, and may be as shown in Table 8 below. Specifically, in relation to the PSSCH / PSCCH and PSFCH in the sidelink, the SCS and CP lengths supported by each of FR1 and FR2 may be as shown in Table 8 below. Here, the waveform may not support DFT-S-OFDM and may support only OFDM, but is not limited thereto. A sidelink-synchronization signal block (SL-SSB) may be defined independently for each frequency range, which may be similar to NR-Uu.

[0093] [Table 8]

[0094] FIG. 5 is a diagram illustrating an NR sidelink resource pool configuration to which the present disclosure can be applied. Referring to FIG. 5, a resource pool may refer to time and frequency resources used for sidelink transmission and reception. As an example, at least one resource pool may be configured within one SL BWP within one carrier. Here, the resources of the resource pool may be configured based on time resources in units of slot sets and frequency resources in units of consecutive subchannel sets. Furthermore, the resource pool may be configured separately for transmission and reception.

[0095] More specifically, the time resource for resource pool configuration provided in the NR sidelink is the time period of the resource pool, the set of sidelink slots within one resource pool application period (sl-TimeResource(length = L bitmap)), the first symbol for a set of consecutive symbols within one slot, and / or the number of consecutive symbols may be configured. The frequency resource may be configured as at least one of the bandwidth of one subchannel (e.g., sl-SubchannelSize={10, 15, 20, 25, 50, 75, and 100} RBs), the total bandwidth of a resource pool indicated by the number of consecutive subchannels (a set of consecutive subchannels (e.g., sl-NumSubchannel={1 to 27}), and the frequency domain position of the first subchannel of the resource pool (sl-StartRBsubchannel={0 to 265}). For example, resources in the time domain and the frequency domain may be configured based on higher layer parameters. In FIG. 5, the frequency resource corresponding to the excluded resource block (RB) may refer to some RBs remaining when the total available RB resources do not exactly match the subchannel size (i.e., the number of RBs does not equal one subchannel). In this case, the resource may not be used in the NR sidelink. Also, for example, reserved slots (reserved slots) may be configured. The sl-slot) can refer to the remaining slots when the length of the bitmap on the time resource (e.g., sl-TimeResource) is not a multiple of the length, and does not need to be used as an NR sidelink resource.

[0096] Next, a case where an unlicensed spectrum is used for communication between a base station and a terminal may be considered. For example, a communication scheme based on an unlicensed spectrum may occupy a channel through contention and perform communication based on the occupied channel. Communication based on an unlicensed spectrum may also be performed between a base station and a terminal. Hereinafter, an operation based on a case where an unlicensed spectrum is used for sidelink communication will be described. That is, an unlicensed spectrum may also be used in sidelink communication, which is communication between terminals. Furthermore, a sidelink resource pool needs to be configured taking into account the use of a sidelink unlicensed spectrum. More specifically, sidelink communication may be performed based on a resource pool, and if communication is performed through an unlicensed spectrum, the resource pool configuration needs to be different.

[0097] For example, the resource pool for sidelink communication may be configured on a slot-by-slot basis to determine symbols available for sidelink within a slot, as shown in Figure 5. In addition, in the frequency domain, the resource pool may be configured based on the number of consecutive subchannels, as shown in Figure 5. The sidelink resource pool configuration may be performed taking into account unlicensed band communication, as will be described later.

[0098] 6 is a diagram illustrating unlicensed bands by region for NR sidelink communication to which the present disclosure can be applied. In Table 8 above, the frequency range of R FR1 may be 450 MHz to 6 GHz, but the corresponding frequency range may be changed to 450 MHz to 7.125 GHz. The NR FR1 frequency range may be changed for the unlicensed band in the 6 GHz band, but is not limited to this.

[0099] By way of example, and without limitation, the unlicensed bands may be located below 1 GHz, 2.4 GHz, 5 GHz, 6 GHz, 37 GHz (US only), and 60 GHz. Referring to Figure 6, for example, the 5 GHz band in the system may be Band 46, defined as 5150-5925 MHz. Furthermore, by way of example, and without limitation, Band 49 (3550-3700 MHz) may be defined as a CBRS (citizens broadband radio service) band for LAA operations.

[0100] Figure 7 is a diagram illustrating the use of the 5 GHz unlicensed band to which the present disclosure can be applied. Referring to Figure 7, each band within the 5 GHz unlicensed band can be set, and the use of the unlicensed band can be set based on that band. For example, the bands can be divided into 20 MHz units for use, and each 20 MHz can be one channel.

[0101] In most areas, the low frequency band from 5150 to 5350 MHz is intended for indoor use and is regulated to have a maximum transmission power of 23 dBm. In the band above 5470 MHz, a transmission power of up to 30 dBm is permitted for outdoor use. In addition to the maximum transmission power limit, some areas may have additional requirements, such as the EIRP (effective isotropic radiated power) value shown in Table 9 below.

[0102] [Table 9]

[0103] Here, PSD (power spectral density) can mean that a device is limited to transmitting at full power within a reference bandwidth. As a specific example, European regulations may limit PSD to 10 dBm / MHz. Therefore, if the bandwidth is not 20 MHz, a device cannot transmit at a maximum transmission power of 23 dBm.

[0104] 8 is a diagram illustrating a method for increasing bandwidth in consideration of PSD limitations to which the present disclosure may be applied. As an example, consider the case of small data transmission, which requires only a small bandwidth, as shown in FIG. 8. In this case, if small data transmission is performed over a wide bandwidth, coverage can be expanded. Furthermore, transmission over a wide bandwidth can satisfy minimum bandwidth occupancy regulations. In consideration of the above, a method for transmitting small data over a wide bandwidth may be preferable.

[0105] For example, when a channel is occupied through a channel access procedure in an unlicensed band, the maximum channel occupancy time (COT), which corresponds to the maximum time that a channel can be occupied, can be set differently for each region. For example, Japan allows a maximum COT of 4 ms, while Europe allows a maximum COT of 8 ms or 10 ms. However, this is merely an example and is not limited to the above-described embodiment. For example, Europe can support Frame Based Equipment (FBE) and Load Based Equipment (LBE) rules. Here, FBE is set to High Performance Radio LAN (HiperLAN) / 2, and LBE can be adopted and applied in the Wi-Fi standard, and both can be supported in NR as a new communication system.

[0106] Further, as an example, the minimum occupied bandwidth may be a specification of a bandwidth that must be minimally occupied once a channel connection is successful. For example, the specification of the minimum occupied bandwidth may be set to occupy 80 to 90% or more of the nominal channel BW. As a specific example, when a terminal transmits a PUSCH to a base station in an unlicensed band, it may request that resources for the PUSCH be allocated to the entire band in an interlaced form with a specific bandwidth, but this may not be limited to this embodiment.

[0107] Furthermore, the dynamic frequency selection provision may be a provision to limit bandwidth usage in order to protect systems (e.g., radio) that have a high priority for using unlicensed bands. Furthermore, the transmit power control provision may be a provision to limit the use of transmit power lower than the maximum permitted transmit power value. Furthermore, the LBT (listen before talk) provision is a provision regarding procedures for channel access, and Europe can support FBE and LBE rules. At this time, FBE is Hiperlan / 2, and LBE can be adopted and applied in Wi-Fi standards, and both can be supported in NR.

[0108] For example, the 5 GHz unlicensed band can be used based on the above, but discussions regarding the use of the 6 GHz band are underway among various countries and organizations. Unlike the 5 GHz band, the 6 GHz band may be a band that has not yet been used by a mobile system. That is, unlike the 5 GHz band, which is shared by multiple mobile communication systems, the 6 GHz band can be used for a single, specific communication system. This reduces the problems and inefficiencies that arise from the coexistence of multiple different systems.

[0109] FIG. 9 is a diagram showing a method for setting a guard band in consideration of a shared band (e.g., an unlicensed band) within an intra-cell to which the present disclosure can be applied.

[0110] Referring to FIG. 9, to support wideband operation in shared spectrum access, the UE may receive an IntraCellGuardBandsPerSCS parameter for each uplink carrier (UL carrier) and downlink carrier (DL carrier) from the base station based on the base station configuration. The UE may receive N subcarrier spacing indexes (μ) on one carrier. RB-set,x A terminal may be provided with an intra-cell guard band of -1. Referring to FIG. 9, the terminal may be provided with higher layer signaling regarding the starting common resource block (CRB) for each guard band and the size of the number of CRBs. For example, a CRB may be a resource block defined / set based on point A, which is the starting point of the transmission bandwidth on a carrier in the frequency domain. The terminal may check information regarding point A through base station signaling and, based on the information, may recognize the CRB position in the frequency domain. Here, each guard band is provided with a starting CRB. JPEG2025528695000016.jpg1326 is defined based on the parameters, and the size of the number of CRBs in each guard band is The UE may be provided with the above information through higher layer signaling based on the startCRB and nrofCRBs parameters, respectively. JPEG2025528695000018.jpg1272, N RB-set,x is the number of RB sets, and x may be set to DL or UL for downlink and uplink. RB-set,xThe RB set may be configured as a resource block set (RBS) within one carrier through guard band configuration. For example, the guard band may be configured based on the IntraCellGuardBandsPerSCS parameter, thereby configuring the RBS within one carrier.

[0111] Here, each RBS frequency bandwidth may correspond to an LBT frequency bandwidth. That is, each RBS may be set to a bandwidth corresponding to an LBT procedure performed between a base station and a terminal. For example, in FIG. 9, RB set 1 (911) and RB set 2 (922) correspond to an LBT bandwidth, and if LBT is successful in that area, the band can be occupied to perform communication. That is, an RBS may correspond to an LBT bandwidth. For example, a transmitting node (e.g., a gNB or UE) can determine channel occupancy for an unlicensed band through an LBT channel access procedure performed on RBS resources corresponding to an LTE bandwidth. If the LBT procedure on one RBS is successful, the transmitting node can transmit on resources corresponding to that RBS.

[0112] Here, each RBS can be defined as a start CRB and an end CRB. The start CRB is JPEG2025528695000019.jpg1326 and the end CRB is JPEG2025528695000020.jpg1320. Here, the size of the guard band 913 may be nrofCRBs. As an example, the size of the guard band 913, nrofCRB, is determined by the subcarrier spacing μ and the carrier size It is not necessary to expect the size to be set to be smaller than the number of applicable intracell guard bands defined taking into consideration requirements regarding whether or not JPEG2025528695000021.jpg1322 will interfere with the wireless bandwidth.

[0113] At this time, the start CRB and the end CRB for each RBS 911, 912 can be determined based on the RBS index s, and the RBS index s is JPEG2025528695000022.jpg1271. That is, the RBS index s is JPEG2025528695000023.jpg may be a resource block having a size of 1323, JPEG2025528695000024.jpg1323 is the number of CRBs determined through the start CRB and end CRB based on Equation 3. Also, the start CRB and end CRB for each RBS may be as shown in Equation 4 and Equation 5.

[0114]

number

[0115]

number

[0116]

number

[0117] For example, if the UE is not provided with the IntraCellGuardBandsPerSCS parameter setting, the μ and carrier size of the carrier The CRB index for the nominal intra-cell guard band and RBS pattern based on JPEG2025528695000028.jpg1321 can be determined according to the requirements of the RF standard. Also, as an example, if the nominal intra-cell guard band and RBS pattern do not include the intra-cell guard band, the RBS of the corresponding carrier can be assumed to be 1.

[0118] For example, in FIG. 9, two LBT BWs (RBS0, RBS1) may be configured within one BWP 922 within one carrier bandwidth. In this case, one guard band 913 may be configured between the two RBSs 911, 913. The positions of the two RBSs 911, 913 may be determined as shown in FIG. 9 based on the above-mentioned higher layer parameters. Also, for example, when multiple BWPs 921, 923 are configured within one carrier bandwidth, the RBS associated with each BWP may be identified. Here, the RBSs corresponding to the first RBS (=s0, 912) and the last RBS (=s1, 911) of each BWP among the RBSs 911, 912 within the carrier may be indexed using the s0 and s1 indexes.

[0119] FIG. 10 illustrates an interlace-based RB resource allocation method applied to the present disclosure. PUCCH / PUSCH transmission can be performed using RB resources allocated on an interlace basis in an unlicensed band. Here, the reference point for the RB resources allocated on an interlace basis may be point A1010. The terminal may obtain information about point A1010 through base station signaling, as described above. Furthermore, CRBs may be resource blocks defined / configured with reference to point A1010, which is the starting point of the transmission bandwidth on a carrier. That is, when PUCCH / PUSCH transmission is performed on interlace-based RB resources, the interlaces can all be used on the carrier based on the same configuration with reference to reference point A1010 and CRBs. As an example, existing wireless communication systems (e.g., LTE LAA) and wireless communication systems (e.g., NR) can perform PUCCH / PUSCH transmission on interlace-based RB resources as described above, but are not limited thereto.

[0120] For example, in the case of a 15 kHz SCS, M=10 interlaces can be defined for all bandwidths. In the case of a 30 kHz SCS, M=5 interlaces can be defined for all bandwidths. Furthermore, X bits can be provided for interlace allocation in frequency resource allocation-related signaling. As a specific example, in the case of a 30 kHz SCS, if X is 5, the X bits can indicate all possible interlace combinations. As another example, in the case of a 15 kHz SCS, if X is 6, the X bits can indicate the starting interlace index and the number of consecutive interlaces. For example, 55 values ​​may be required based on the combination of the starting interlace index and the number of consecutive interlaces. Therefore, when indicated by 6 bits, there can be 9 remaining RIV values, and the 9 remaining RIV values ​​can indicate specific pre-defined interlace combinations.

[0121] Furthermore, Y bits can be provided for RB set allocation in frequency resource allocation-related signaling. The RB set allocation can be a start and end RB set based on the RIV format. Here, the RB sets can always be consecutive. Furthermore, as an example, when two adjacent RB sets are allocated, a guard band between the RB sets can be allocated and can be used as a frequency resource.

[0122] For example, in unlicensed bands, a method may be needed to allow various wireless access technologies / systems (e.g., Wi-Fi, LAA, NR-U, etc.) to use channels fairly and closely. For example, regulations (e.g., ETSI rules) for channel access may be provided, focusing on the above-mentioned 5 GHz and 6 GHz frequency bands, and items such as those shown in Table 10 below may be specified, but are not limited thereto.

[0123] [Table 10]

[0124] Here, the FBE (Frame Based Equipment) and LBE (Load Based Equipment) rules can be supported as channel access methods based on Table 10. As an example, the LBE channel access rule can take into account the factors in Table 11 below. Channel access can be performed by determining whether or not a channel is occupied based on CCA measurement. In addition, transmission based on an occupied channel can be performed after determining the transmission power based on the channel occupation.

[0125] [Table 11]

[0126] In addition, a channel access priority class (CANC) can be set for channel access, which may be similar to Table 12 below. Here, the priority class can define a priority based on a specific traffic type and quality of service (QoS) requirements. As an example, four priority classes can be defined in Table 12. Here, a different priority counter (p) value can be defined for each priority class. In this case, the higher the priority class, the lower the priority counter value.

[0127] Further, as an example, the channel occupancy time (CONT) may be a transmission burst interval. Here, the maximum COT limit may be determined differently for each priority class, and a higher priority class may have a shorter maximum COT interval. That is, the higher the priority class, the lower the priority counter value may be and the shorter the maximum COT interval may be.

[0128] Furthermore, as an example, the contention window (CW) may be a window used to select a counter value for performing a backoff procedure for channel access, where the contention window may be different for each priority class, which may be similar to Table 12 below.

[0129] [Table 12]

[0130] FIG. 11 is a diagram illustrating a method for performing a listen before talk (LBT) procedure in an unlicensed band to which the present disclosure can be applied. As an example, a Type 1 LBT procedure (LBT category 4) can be considered based on the LBE described above. The LBT procedure can be configured based on Category 1 to Category 4, which will be described later. Referring to FIG. 11, a transmitting node can wait for a defer period to determine whether a channel is available (S1110). Here, the defer period can be determined based on the priority class in Table 13 below. As an example, the defer period can measure whether a channel is available for at least 25 us. Here, it can be considered that feedback information regarding data transmission is transmitted within a maximum of 16 us. Taking the above into consideration, the defer period can measure whether a channel is available for at least 25 us.

[0131] Thereafter, if the node determines that the channel is available during the deferral period, it can perform a backoff procedure. At this time, the backoff counter N can be initialized to any value between 0 and the CW value (S1120). That is, any value between 0 and CW can be used as the backoff counter. Here, it is possible to count whether the channel is available based on 9us slots, and perform backoff by the backoff count value. Here, a larger average backoff value can be set based on a larger contention window, which can reduce the collision probability.

[0132] Thereafter, it is determined whether the backoff counter value is 0 (S1130). If the backoff counter value is 0, the node can perform transmission. The node can use the channel for transmission up to the maximum COT that can be occupied based on the priority class. On the other hand, if the backoff counter value is not 0, the backoff counter value can be decremented (S1140). Then, it is determined whether the next 9 us slot is idle (S1150). At this time, if the 9 us slot is idle, it checks again whether the backoff counter value is 0. If the backoff counter value is not 0, it repeats the operation of decrementing the backoff counter value. When the backoff counter value becomes 0, the above-mentioned transmission can be performed.

[0133] On the other hand, if the channel is not idle in the 9 us slot, the node waits again for the deferral interval and then checks whether the channel is available based on the backoff counter value (S1160). Based on the above, the node can occupy the unlicensed band and perform transmission. Furthermore, as an example, the deferral interval, possible contention window value, and maximum COT for the downlink / uplink based on the priority class may be the same as those in Table 13 below.

[0134] [Table 13]

[0135] Here, as an example, the size of the contention window may be adjusted based on HARQ feedback. Specifically, if the HARQ feedback received for the first transmission performed by the node within the COT is a NACK, the size of the contention window may be increased by up to twice to account for retransmission. On the other hand, if the HARQ feedback received for each transmission is an ACK, the size of the contention window may be reset to the CW min value. In this case, adjusting the size of the contention window for the first transmission within the COT may cause a collision in the first transmission after the node occupies the channel, and in such cases, it is necessary to update the size of the contention window. On the other hand, receiving a NACK for a transmission after the first transmission within the COT may be more likely to occur due to poor channel conditions or other reasons than a collision. Therefore, the size of the contention window may be adjusted based on the feedback of the first transmission within the COT, as described above.

[0136] As another example, the contention window adjustment for configured grant-based downlink / uplink (DL / UL) transmission may be performed based on feedback information on the downlink / uplink, respectively. Furthermore, as another example, when there is no downlink feedback transmission in uplink grant (UL grant-based uplink transmission), the contention window adjustment may be performed through a new data indicator (NDI), but is not limited to a specific embodiment.

[0137] Further, as an example, the energy detection (ED) threshold (TL) may 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., Wi-Fi) or whether the installation method ensures the use of only a specific wireless communication system (e.g., NR). As a specific example, the maximum threshold in the 5 GHz band coexisting with other systems may be set to −72 dBm for a 20 MHz carrier. Here, −72 dBm may be a value determined in comparison with other wireless communication systems (e.g., Wi-Fi systems), but is not limited to a specific embodiment. As another example, when the carrier frequency is used exclusively with a specific wireless communication system (e.g., NR), the maximum threshold may be −62 dBm for a 20 MHz carrier, and the threshold for uplink transmission may be set through RRC signaling based on regulations, but is not limited to a specific embodiment.

[0138] Next, FIG. 12 illustrates COT sharing and discovery burst transmissions applied to the present disclosure. Referring to FIG. 12, when a channel is occupied based on the aforementioned Type 1 LBT procedure, transmission can be performed within the COT. Here, Type 2 transmission can have three options based on the gap duration within the COT, as shown in Table 14 below. For example, Type 2A (LBT cat2) transmission sets the COT gap to 25 us or more and can be used for discovery burst transmission. For example, Type 2A can be considered for SSB transmission, but is not limited thereto. For another example, Type 2B transmission can apply a COT gap of 16 us. Furthermore, Type 2C transmission can apply a COT gap of 16 us or less. For example, if the next transmission is at most 16 us, idle sensing may not be required, and Type 2C can be applied.

[0139] [Table 14]

[0140] Here, due to the above-mentioned COT sharing, the gap may be smaller than the OFDM symbol duration. This is because the OFDM symbol-based resource allocation method may be insufficient, and a method of indicating CP extension can be applied taking the above-mentioned issue into consideration. That is, it is possible to indicate that the CP is extended earlier than the OFDM symbol boundary, and one of the following Table 15 can be indicated.

[0141] [Table 15]

[0142] As an example, Figure 13 is a diagram illustrating a method for applying a CP extension to an uplink when COT sharing is performed between a downlink and an uplink, which is applicable to the present disclosure. Figure 13 may illustrate, but is not limited to, a case in which a 16 us gap is present based on COT sharing and C2 is set to 1. Referring to Figure 13, a TA value can be considered to ensure a 16 us gap between the downlink and the uplink in a base station. As an example, the C value can be set through RRC signaling. Furthermore, a CP extension for uplink transmission can be indicated in an uplink grant.

[0143] As another example, a case where channel access is performed based on the FBE method can be considered. FBE may be a channel occupation method applicable to areas where the absence of other systems is guaranteed by regulation (e.g., a specific building or factory). Here, when channel access is performed based on the FBE method, transmission can start at a specific time. As a specific example, FIG. 14 illustrates a semi-static channel access procedure applicable to the present disclosure. Referring to FIG. 14, one COT can be started every Tx ms. At this time, the channel can be occupied if it is idle for at least 9 us before the COT. Here, Tx ms can be set to a value between 1 ms and 10 ms. Furthermore, the gap can be at least 5% of Tx. Here, COT sharing can be used similarly to LBE, and the gap can be at most 16 us.

[0144] As an example, Figure 15 illustrates a method for performing channel occupation applicable to the present disclosure. Referring to Figure 15, before performing transmission on an operating channel, a device may perform a CCA check based on energy detection with a CCA observation period of no less than 20 us. Furthermore, as an example, when transmitting a control frame (e.g., ACK, Block ACK) in consideration of multicast, the transmission may skip the CCA procedure and be performed immediately after packet reception. That is, the terminal may perform control frame transmission without a new CCA procedure, but may not exceed the maximum COT.

[0145] For example, if a device transmits an ACK / NACK signal after receiving data, the device can skip CCA, but this must be within the maximum COT. Also, for example, in short control signaling, a signal having a maximum duty cycle of 5% or less of 50 ms in the observation period can be transmitted without CCA, but this is not limited to a specific form.

[0146] Further, as an example, LBT categories can be considered, including category 1, which performs transmission immediately after a short switching gap, category 2, which performs LBT without random backoff, category 3, which performs a fixed-size contention window and random backoff, and category 4, which performs a variable-size contention window and random backoff.

[0147] Specifically, Category 1 may be a scheme in which transmission is performed immediately after a short switching gap. In this case, Category 1 can be used to perform transmission immediately after a switching gap within one COT. The switching gap from receive to transmit within one COT may include the transceiver switching time and may not be longer than 16 μs. Furthermore, as an example, Category 2 may be an operation in which LBT is performed without random backoff. For example, when performing LBT, initial CCA may be performed, and if the channel is idle, the channel is occupied and data is transmitted over an unlicensed channel. Here, random backoff counting may not be performed. On the other hand, Category 3 may be an LBT scheme in which a contention window of a fixed size is used and random backoff is performed. When LBT is performed based on Category 3, if initial CCA is performed and the channel is idle, random backoff may be performed within a fixed contention window (e.g., a fixed “q” value, where q is a value that determines the contention window size by selecting a random N counter between 0 and q). As an example, the random backoff operation may involve randomly selecting a counter value within the contention window, decrementing the count depending on whether the channel is idle for each ECCA slot, and occupying the channel when the value is 0.

[0148] As another example, Category 4 may be an LBT scheme with a variable-sized contention window and random backoff. Category 4 may differ from Category 3 in that it has a variable contention window. However, the operation of applying the N value based on the random backoff value to occupy a channel may be similar. That is, Category 4 may be the same as Category 3 except that the contention window size may vary based on time or events, and may be used in multiple wireless communication systems (e.g., LAA, NR-U, WiFi). However, this is not limited to a specific embodiment. Here, as an example, different channel access categories (e.g., LBT categories) may be defined and used for transmission of different channels / signals within one COT. Furthermore, as an example, in a new wireless communication system (e.g., NR-U), Category 4 LBT and Category 2 may be used within a COT, which may be similar to Table 16 below. Category 2 LBT may be used for discovery burst transmission when there is no unicast transmission and its transmission characteristics are constrained transmission, with a transmission time of 1 ms or less and a duty cycle of 5% or less, but is not limited to a specific form.

[0149] [Table 16]

[0150] The following describes a method for allocating frequency resources so that sidelink communication in a wireless communication system (e.g., NR) can operate on an unlicensed frequency band. For example, the size of an RB set included in 20 MHz in an unlicensed band (e.g., NR-U) of a current wireless communication system may vary depending on the SCS. For example, in the case of a 15 kHz SCS, the size of the RB set may be 100 to 110 PRBs. Furthermore, in the case of a 30 kHz SCS, the size of the RB set may be 50 to 55 PRBs. In this case, for example, when allocating RB resources based on interlaces, some interlaces may include 11 PRBs, while the remaining interlaces may include only 10 PRBs.

[0151] Here, as an example, a case where subchannel sizes are different to use the entire bandwidth in the sidelink may be considered. That is, a case where the number of PRBs included in each subchannel is set to be different may be considered. However, if different subchannel sizes are set, it may be difficult to ensure transmission when retransmissions are performed after the initial transmission of TBs having the same transport block size (TBS). In consideration of the above, the subchannel size (i.e., the number of PRBs) may be set to the same for each subchannel, but is not limited thereto. However, if the subchannel size is set to the same for each subchannel, some of the subchannels may not be used in one interlace based on interlace-based RB resource configuration.

[0152] 16 is a diagram illustrating a method for configuring RBSs in a BWP and a resource pool in a sidelink unlicensed band to which the present disclosure is applicable. The frequency domain resource structure of a sidelink unlicensed band wireless communication system (e.g., NR SL-U) may consider a BWP (bandwidth part), a RP (resource pool), interlaced RBs, and an RBS (RB set). For example, an RBS may also be considered in an unlicensed band wireless communication system (e.g., NR U), and is not limited to a specific embodiment.

[0153] Referring to Figure 16, one sidelink unlicensed band (SL-U) BWP 1610 may be configured in a sidelink terminal, one SL-U RP 1620 may be configured in the SL-UBWP 1610, and two RBSs 1631 and 1632 may be configured in the SL-U RP 1620. However, this is merely an example for convenience of explanation and is not limited to the above-mentioned embodiment. Here, as an example, an interlaced structure may be considered in an SL-U system to satisfy the OCB and PSD requirements required in the unlicensed band. That is, in an SL-U system, CRB indexing may be performed based on point A, which is a reference frequency point of one carrier, and a sidelink interlaced structure may be applied. In Figure 16, a frequency domain corresponding to CBR index 47 to CRB index 90 can be configured in the SL-U BWP 1610 based on the SL-U BWP 1610 configuration, and frequency resources including two RBSs 1631 and 1632 can be configured based on the SL-U RP 1620 configuration, but this is only an example and is not limited thereto. Hereinafter, a method for configuring frequency domain resources for an SL-U system as shown in Figure 16 and a method for allocating resources for actual SL-U data transmission based thereon will be described.

[0154] For example, the channel access procedure of a sidelink unlicensed band wireless communication system (e.g., NR SL-U) can apply the above-described Type 1 channel access procedure and Type 2 channel access procedure. Also, for example, UE-to-UE COT sharing can be applied between terminals operating in a sidelink unlicensed band. That is, a transmitting terminal can share a portion of unlicensed resources acquired through the LBT procedure with a receiving terminal or another terminal.

[0155] For example, in a sidelink unlicensed band wireless communication system (e.g., NR SL-U), frequency resources can be configured based on subchannels, as in an existing sidelink wireless communication system (NR SL). That is, the term "subchannel" can be used in NR SL-U as in NR SL. However, the names of subchannels can be configured differently in a sidelink unlicensed band wireless communication system (e.g., NR SL-U) and are not limited to a specific embodiment. For convenience of explanation, the following description will be based on subchannels.

[0156] As an example, an interlace-based RB structure for satisfying the requirements of the unlicensed spectrum described above may be defined with M RBs in the frequency domain. Here, the interlace-based RB structure may be defined as RBs spaced apart by a uniform number of RBs. As another example, the interlace-based RB structure may also be set to RBs spaced apart by a non-uniform number of RBs, and is not limited to a specific embodiment.

[0157] Here, the interlace-based RB structure may be pre-configured commonly for NR SL UEs, cell-specific or carrier-specific, based on bandwidth / pneumatics. As another example, the interlace-based RB structure may be configured specific to a physical link between UEs through higher layer configuration, and is not limited to a specific embodiment. In this case, the interlace-based RB structure may be applied to all interlaces regardless of carrier bandwidth. Therefore, the interlace-based RB structure may be configured by a CRB defined based on point A, a specific reference point in the frequency domain. Here, one sub-channel may be pre-defined to have k interlaces. As another example, one sub-channel may be configured with k interlaces through higher layer signaling. k may be the number of interlaces per sub-channel. The number of interlaces per sub-channel may have a fractional (or decimal) or integer value, as will be described later. Furthermore, as an example, when multiple RBSs are configured in one SL BWP, the frequency resource allocation instruction may include RBS allocation information and sub-channel or interlace-based RB frequency resource allocation information.

[0158] As another example, in a sidelink unlicensed spectrum system (e.g., NR SL-U), resource allocation can be performed based on interlace-based RB units rather than "subchannel" units. In this case, the frequency resource allocation unit can be an interlace-based RB unit rather than the existing subchannel, but this is merely an example and is not limited to a specific embodiment.

[0159] Hereinafter, both subchannel units and interlace-based RB units can be considered as resource allocation units in the frequency domain. Herein, a subchannel can be configured with k interlaces or a number of consecutive RBs. However, for convenience of explanation, a "subchannel unit" based on an interlace structure will be described as a unit of frequency resource allocation. However, frequency resource allocation can also be configured in interlace-based RB units rather than in subchannel units by applying the proposed method, and is not limited to a specific form.

[0160] Here, as an example, FIG. 17 illustrates a method for configuring a sidelink unlicensed band resource pool based on contiguous frequency resources to which the present disclosure is applied. Referring to FIG. 17, the sidelink unlicensed band resource pool 1710 may also be configured based on contiguous frequency resources. In this case, the sidelink unlicensed band resource pool 1710 may be indicated only by an RBS index. More specifically, referring to FIG. 17, a case may be considered in which only one RBS 1720 is configured in the sidelink unlicensed band resource pool 1710 in consideration of the LBT procedure for the unlicensed band. Here, the sidelink unlicensed band resource pool configuration may be instructed to the UE based on contiguous frequency resources from a frequency domain perspective (hereinafter, referred to as Case 1). As an example, to satisfy the above-mentioned requirements such as OCB and PSD on the unlicensed band, most frequency resources (e.g., >80%) in at least one LBT BW (RBS 1720) may be configured in one resource pool. Considering the above-mentioned provisions, there may be a limit to configuring more than one resource pool for one RBS in one SL BWP. That is, since only one resource pool exists in one RBS, it can be configured to include most of the frequency resources, thereby satisfying the above-mentioned regulations. In this case, for example, sidelink transmission can be performed by selecting resources to be used for actual transmission through interlace-based frequency resource allocation in a resource pool configured on a contiguous frequency resource basis.

[0161] On the other hand, Figure 18 illustrates frequency resource-based sidelink unlicensed band resource pool configuration using interlace allocation to which the present disclosure is applied. Referring to Figure 18, in order to satisfy the regulations on frequency utilization in the unlicensed band, a resource pool can be configured using new interlace RBs or interlace RB-based subchannels from the initial resource pool configuration step. That is, interlace RBs or interlace RB-based subchannels can be used from the resource pool configuration. As an example, referring to Figure 18, when configuring a frequency resource-based sidelink unlicensed band resource pool using interlace allocation, frequency resources for the resource pool configuration can be indicated based on a combination of RBSs and interlace / subchannel indexes (hereinafter referred to as Case 2).

[0162] That is, in Figure 18, resource pools 1821 and 1822 can be configured using interlaced RBs or interlaced RB-based subchannels from the initial resource pool configuration step to satisfy requirements such as OCB and PSD. Therefore, the sidelink unlicensed band resource pools 1821 and 1822 do not need to have contiguous subchannels or PRB structures. That is, the sidelink unlicensed band resource pools 1821 and 1822 can be configured with non-contiguous PRBs based on interlaced allocation, thereby satisfying requirements such as OCB and PSD. Furthermore, unlike Case 1 (Figure 17), multiple sidelink unlicensed band resource pools can be configured within one RBS, thereby providing flexibility in resource configuration.

[0163] Here, the resource pool configuration methods corresponding to the above-mentioned Case 1 and Case 2 can both consider an interlace-based frequency resource allocation method. However, there may be a difference in whether the frequency resources are configured as contiguous frequency resources similar to the existing NR SL in the step of configuring one resource pool (Case 1), or whether a discontinuous resource pool is configured taking into account the interlace structure from the resource pool configuration step (Case 2). Based on the above, an RBS-based sidelink unlicensed band resource pool configuration method will be described below.

[0164] FIG. 19 illustrates a sidelink unlicensed band resource pool configuration method applicable to the present disclosure.

[0165] The sidelink unlicensed band resource pool can be configured based on the RBS. For example, the sidelink resource pool can be configured based on consecutive subchannels through the resource pool start point and the number of subchannels in the resource pool. For example, as described above, the sidelink unlicensed band pool can also be configured as a resource pool corresponding to an LBT BW through the resource pool start point and the number of subchannels in the resource pool based on consecutive subchannels. However, to efficiently configure the sidelink unlicensed band resource pool, the RBS setting and index can be taken into consideration. That is, the sidelink unlicensed band resource pool can be configured as one resource pool by indicating the RBS setting / index in resource pool configuration signaling.

[0166] As a specific example, a resource pool can be configured with one or more RBSs. Therefore, a specific resource pool can be configured with consecutive RBS indexes associated with the resource pool, allowing for frequency configuration for the resource pool. Here, when the frequency configuration of a resource pool is performed based on consecutive RBS indexes, the resource pool can utilize gap band resources between RBSs, thereby maximizing frequency resource efficiency. Consider the case where four RBSs are configured within one sidelink BWP. Here, a gap band can be configured between each RBS, allowing for three gap band configurations to be configured. In this case, the resource pool of the sidelink unlicensed band can be configured with consecutive RBS indexes based on the LBT BW. Specifically, frequency domain resource configuration for one resource pool configuration can be provided through RBS index information. For example, frequency domain resource configuration for one resource pool configuration can be provided through a starting RBS index and consecutive RBS number information.

[0167] Referring to FIG. 19, configuration 0 (1910) can set a resource pool to four consecutive RBSs, from RBS#0 to RBS#3. Here, configuration 0 (1910) can specify a resource pool configuration by specifying a starting RBS index, RBS#0, and the number of consecutive RBSs, four. As another example, configuration 1 (1920) can specify two consecutive RBSs, with RBS#0 and RBS#1 set to sidelink resource pool#0 and RBS#2 and RBS#3 set to sidelink resource pool#1. Here, configuration 1 can specify a resource pool configuration by specifying a starting RBS index, RBS#0 and RBS#2, and the number of consecutive RBSs, two, for each resource pool. As another example, configuration 2 (1930) can set sidelink resource pool #0 for RBS #0, sidelink resource pool #1 for RBS #1, sidelink resource pool #2 for RBS #2, and sidelink resource pool #3 for RBS #3. In this case, since each resource pool corresponds to a respective RBS, the corresponding RBS index and RBS number 1 can be indicated. As another example, configuration 3 (1940) can set sidelink resource pool #0 for RBS #0, sidelink resource pool #1 for RBS #1 and RBS #2, and sidelink resource pool #2 for RBS #3. Here, the starting RBS index and RBS number corresponding to each sidelink resource pool can be indicated, thereby indicating the configuration for each resource pool. As another example, in configuration 4 (1950), sidelink resource pool #0 can be configured for RBS #0, RBS #1, and RBS #2, and sidelink resource pool #1 can be configured for RBS #3. Here, the starting RBS index and the number of RBSs corresponding to each sidelink resource pool can be specified, thereby specifying the configuration for each resource pool.However, the resource pool configuration in FIG. 19 is merely an example and is not limited to the above-described embodiment.

[0168] In this case, as an example, if multiple RBSs are configured in the SL BWP, frequency resource information for configuring a resource pool of the sidelink unlicensed band can be indicated to the terminal through at least one of interlace / subchannel-based configuration information and RBS configuration information.

[0169] Here, when both interlace / subchannel-based configuration information and RBS configuration information are provided, frequency resource configuration information for one resource pool can be provided to a UE through intersecting frequency resource information. Also, when an intra-cell guard band (GB) existing between consecutive RBSs is configured in one resource pool, the frequency resource corresponding to the GB can also be used for sidelink unlicensed band communication as part of the resource pool.

[0170] Based on the above, a method for allocating frequency resources for sidelink unlicensed band data transmission / reception in the frequency domain will be described below. The following description is applicable to the methods for configuring a resource pool for at least one of the interlace / subchannel-based configuration information and the RBS configuration information, and is not limited to a specific embodiment.

[0171] Also, as an example, the following matters can be applied to both the case where consecutive frequency resources are configured in one resource pool (Case 1) and the case where a resource pool is configured based on discontinuous frequency resources (Case 2) in the above description. However, for convenience of explanation, the following matters will be described based on the case where one resource pool is configured based on consecutive frequency resources (Case 1), but they can also be applied interchangeably to the case where a resource pool is configured on discontinuous frequency resources (Case 2), and are not limited to a specific form.

[0172] For example, the frequency resource configuration of the sidelink unlicensed band may be configured based on consecutive frequency resources according to starting subchannel information and the number of consecutive subchannels. Also, the time resource configuration of the sidelink unlicensed band may be configured by excluding SSB transmission slots, reserved slots, and / or TDD UL-DL configuration, and then applying a bitmap to the remaining slots to configure a resource pool, and the present invention is not limited to a specific embodiment.

[0173] However, the following description will focus on frequency resource configuration for the sidelink unlicensed band. For example, the instruction for the sidelink resource set (SL RBS) index (i.e., bit size) may be configured taking into account the total number of SL RBSs included in one SL BWP. In this case, the instruction for the SL RBS index may indicate one or more SL RBS indexes. For example, the SL RBSs may be configured contiguously in the frequency domain, but this is not a limitation. However, for convenience of explanation, the following description will be based on SL RBSs configured contiguously in the frequency domain.

[0174] Further, as an example, frequency resource reservation can be indicated via a physical sidelink control channel (PSCCH). In this case, the frequency resource reservation indication can be performed in the second slot or the second / third slot based on the PSCCH received in the lowest interlace index among the interlace indexes defined within one carrier bandwidth. The interlace structure can be set to 10 interlaces (i.e., M=10) for 15 kHz SCS and 5 interlaces (i.e., M=5) for 30 kHz SCS based on the LBT BW considered in the unlicensed band, as described above. Specifically, the interlace structure can be set as described above, taking into account that the number of RBs for constituting one RBS is 100 to 110 RBs for 15 kHz SCS and 50 to 55 RBs for 30 kHz SCS based on the LBT BW.

[0175] That is, in the case of a 15 kHz SCS, a partial resource (i.e., RB) of the same interlace may exist for every 10 RBs. However, the interlace value may be configured as another value based on at least one of another RBS size (LBT BW), SCS, and the number of RBs constituting one interlace, and is not limited to a specific embodiment.

[0176] CRB-to-SL Interlace Mapping and SL Interlace and Subchannel Mapping

[0177] For example, k interlaces can be set to configure one subchannel. Here, k can be an integer or a fraction (or decimal point number) excluding 0. If k is an integer, k interlaces can be set to one subchannel. On the other hand, if k is a fraction (or decimal point number), multiple subchannels can be associated with one interlace index. For example, if k=1 / 2, one interlace index can correspond to two subchannel indexes.

[0178] Hereinafter, the CRB and interlace indexing will be described based on the carrier perspective, i.e., the CRB starts from point A and interlace indexing is performed based on the CRB, but the present invention is not limited thereto.

[0179] Further, as an example, RBS configuration for the sidelink unlicensed band may be provided by configuring an intra-cell guard band based on the CRB, which may be similar to the above-mentioned FIG. 9. Here, when configuring an SL BWP, at least one resource may be configured within the SL BWP. Furthermore, one resource pool may be configured to be included in at least one RBS. Meanwhile, subchannel indexing may be performed independently within one resource pool, but is not limited thereto.

[0180] Here, as an example, interlace index allocation in a CRB can be performed based on two methods. Specifically, interlace index allocation can be performed uniformly based on an interval M in the CRB in the frequency domain (hereinafter referred to as option 1). Or, interlace index allocation can be performed non-uniformly in the CRB in the frequency domain (hereinafter referred to as option 2). When interlace index allocation is performed based on option 2, the interlace index can be randomly assigned or can be performed based on interleaving-based indexing.

[0181] After the interlace indexes are assigned, the assignment between the assigned interlace indexes and each subchannel can be performed based on two methods. For example, each subchannel index constituting one resource pool can be mapped to consecutive sidelink interlace index(es) (hereinafter referred to as Option A). Alternatively, each subchannel index constituting one resource pool can be mapped to non-consecutive sidelink interlace index(es) (hereinafter referred to as Option B).

[0182] Also, as an example, a case may be considered in which multiple RBSs are configured in one BWP within one resource pool. Here, the relationship between the subchannel index and the sidelink interlace index may be different. For example, the relationship between the subchannel index and the sidelink interlace index may be applied to all RBSs configured in one resource pool (hereinafter referred to as Option I). For example, if the relationship between the subchannel index and the sidelink interlace index is applied to all RBSs configured in one resource pool, the same relationship may also be applied to the guard band resources between the RBSs, but this is not limiting.

[0183] Alternatively, the relationship between the subchannel index and the sidelink interlace index may be applied independently to each RBS configured in one resource pool (hereinafter referred to as Option II). Here, since the relationship between the subchannel index and the sidelink interlace index is applied independently to each RBS, the above-described relationship may not be applied to the guard band. Alternatively, the relationship between the subchannel index and the sidelink interlace index may be applied independently to some of the RBSs configured in one resource pool (Option III). In this case, for example, if some RBSs are consecutive RBSs, the relationship between the subchannel index and the sidelink interlace index may be similarly applied to the guard band between the consecutive RBSs, and this is not limited to a specific embodiment.

[0184] Furthermore, the relationship between the subchannel index and the interlace index may be configured in a higher layer setting so that the relationship starts from the lowest interlace index and corresponds to the lowest subchannel index in sequence. As yet another example, the relationship between the subchannel index and the interlace index may be configured sequentially so that the interlace index corresponding to the lowest frequency resource in the frequency domain within the resource pool is assigned to the lowest subchannel index, and is not limited to a specific embodiment.

[0185] The following describes methods for applying all or some of the multiple combinations of Option 1 / 2, Option A / B, and Option I / II / III to the sidelink unlicensed band. As an example, all of the methods based on the combinations of Option 1 / 2, Option A / B, and Option I / II / III can be applied to the sidelink unlicensed band. As another example, some of the methods based on the combinations of Option 1 / 2, Option A / B, and Option I / II / III can be applied to the sidelink unlicensed band.

[0186] As another example, each method based on the combinations of Option 1 / 2, Option A / B, and Option I / II / III described above may be applied independently of the other methods. Here, whether to apply any of the configurable combinations based on the above may be indicated by a higher layer configuration. That is, parameters for at least some of the above options may be set, and the option to be applied through each parameter may be indicated by a higher layer configuration. As another example, whether to apply any of the configurable combinations based on the above may be set in advance. That is, for convenience of explanation, each of the above combinations will be described below, but only a predetermined method may be applied, and it is not necessary to consider all of the following combinations. As another example, some options of the configurable combinations based on the above may be indicated by a higher layer configuration, and some options may be applied in a predetermined method, and this is not limited to a specific embodiment.

[0187] As a specific example, Option 1-A may mean an operation based on a combination of Option 1 and Option A. Similarly, Option 2-A may mean an operation based on a combination of Option 2 and Option A. Furthermore, Option 2-B may mean an operation based on a combination of Option 2 and Option B. Here, in consideration of a case where multiple RBSs are configured in one resource pool within one BWP, the above-described Option I, Option II, and Option III may be further applied to the above-described combination. As an example, a relationship configuration between a final subchannel, an interlace, and a CRB may be generated based on the above-described combination.

[0188] Here, as an example, the interlace configuration in Table 17 below may be considered based on an LBT BW of 20 MHz (i.e., RBS size) of the sidelink unlicensed band. However, this is merely an example, and different values ​​may be considered depending on different SCS values, interlace structures, and overall RBS sizes, and is not limited to a specific embodiment. Here, CRB and interlace indexing may be performed based on point A within one carrier bandwidth. As an example, the above configuration may be a value determined by the SCS, the frequency band of the unlicensed band, and the carrier bandwidth.

[0189] [Table 17]

[0190] Option 1 (Uniform-based CRB vs. interlace index relationship setting method)

[0191] When the equal-based CRB to interlace index allocation method is configured by the upper layer, the number of interlace resource blocks can be set for each of the 15 kHz SCS (u=0) and the 30 kHz SCS (u=1) as shown in Table 18 below. Here, the number of interlace resource blocks is set for consecutive interlace indexes in the frequency domain. JPEG2025528695000037.jpg1258 to CRBs JPEG2025528695000038.jpg1283 can be configured. SL BWP i continuous interlaced m interlaced RB JPEG2025528695000039.jpg1247 and CRB The relationship with JPEG2025528695000040.jpg1212 can be determined by the following formula (6).

[0192] [Table 18]

[0193]

number

[0194] As an example, FIG. 20 illustrates a case where subchannel indexes are mapped to consecutive sidelink interlace indexes based on a uniform CRB-to-interlace index relationship applicable to the present disclosure. Referring to FIG. 20, interlace indexes are assigned to consecutive CRBs in the frequency domain, and a mapping relationship between interlace indexes and subchannel indexes can be established. Here, a one-to-one relationship (i.e., k=1) may exist between interlace M and subchannel N. For example, when two or more interlace indexes are assigned to one subchannel index (k=2), two consecutive interlace indexes may be assigned to one subchannel. When two interlace indexes are assigned to one subchannel index, interlace indexes #0 and #1 may be mapped to subchannel index #0, interlace indexes #2 and #3 may be mapped to subchannel index #1, and interlace indexes #4 and #0 may be mapped to subchannel index #2. The mapping may be performed sequentially in the same manner.

[0195] Here, in the allocation method between interlaces and subchannels, only resources in which the subchannels and interlace mappings have a multiplication relationship with each other within the number of interlaces M can be used as sidelink resources. For example, if there are interlace resources remaining after applying the multiplication relationship, the resources may not be used. As another example, the configuration may be restricted to always have only a multiplication relationship with each other, but this is not limited to a specific embodiment.

[0196] However, for convenience of explanation, Figure 20 will be described based on the case where there is a one-to-one relationship between interlace M and subchannel N. Specifically, an SL-U resource pool can be configured based on the SL-U BWP in a specific CRB 2010 based on consecutive CRBs and point A. The SL-U resource pool can include two consecutive RBSs.

[0197] Here, interlace indices can be assigned based on the above-described Equation 6 starting from interlace index #0 (2020) with reference to a specific CRB 2010. Furthermore, subchannel indices may also be mapped sequentially starting from the lowest subchannel index #0 (2030) corresponding to the lowest interlace index #0 (2020). Based on the above, interlace indices in a CRB in the frequency domain may be evenly assigned based on a constant interval M, and each subchannel index constituting one resource pool may be mapped to each of consecutive sidelink indices, which may be the above-described Option 1-A scheme.

[0198] Option 2 (Non-uniform CRB to interlace index relationship setting method)

[0199] FIG. 21 illustrates a case where interlace indexes for CRBs applicable to the present disclosure are non-uniformly allocated and subchannel indexes are respectively mapped to consecutive sidelink interlace indexes. Referring to FIG. 21, interlace indexes in a CRB may be allocated non-uniformly in the frequency domain. That is, interlace indexing may be applied in a different order for each interlace block. For example, an interlace block may be a set of interlaces corresponding to the number of interlaces. Specifically, the first interlace block 2110 may be a set of interlaces corresponding to the number of interlaces (M=5). Here, FIG. 21 illustrates a case where two RBSs are configured for one SL-U resource pool in one SL-U BWP. For example, interlace indexes may be allocated based on consecutive CRBs and point A, and as described above, interlace indexing may be applied in a different order for each interlace block. For example, in the SL-U resource pool, interlace block 2120 may be applied with interlace indexing in a different order from the first interlace block 2110. This allows for a non-uniform relationship between CRBs and interlace indices. Here, subchannel indices may be mapped to consecutive interlace indices. That is, subchannel indices may be mapped to correspond to the lowest interlace index. That is, interlace index #0 may be mapped to subchannel index #0. Therefore, Figure 21 may be an Option 2-A scheme based on the above options.

[0200] On the other hand, Figure 22 may be a method of allocating subchannel indexes based on the interlace index in the interlace block M2210, which is lowest in frequency within the resource pool. Here, each subchannel index can be allocated sequentially from #0 up to the maximum subchannel index based on the interlace index corresponding to the lowest interlace (the same index). That is, interlace index #2 of the resource block with the lowest frequency within the interlace block 2210 can be mapped to subchannel index #0, and the next interlace index #3 can be mapped to subchannel index #1, and interlace indexes and subchannel indexes can be mapped in the same manner. Here, the same subchannel index can be mapped to the same interlace index. For example, Figure 22 may apply a different indexing method depending on the position in the frequency domain compared to Figure 21.

[0201] For example, when a non-uniform CRB to interlace index relationship is set, the number of interlace resource blocks can be determined based on Table 18. Here, the interlace index in the frequency domain is JPEG2025528695000043.jpg1258 can be configured with a non-uniform relationship to CRBs. SL BWP i is continuous interlaced, m is interlaced RBs. JPEG2025528695000044.jpg1255 and CRB The relationship with JPEG2025528695000045.jpg1220 can be determined by the following Equation 7. JPEG2025528695000046.jpg1324 can be the CRB index for the BWP start relative to CRB#0. Furthermore, the relationship between continuous interlace m and non-uniform interlace m' can be considered.

[0202] As a specific example, a cyclic block interleaver may be applied to each interlace block (M) to generate a non-uniform interlace m'. As a specific example, when M = 5, the X x Y block interleaver set may be as shown in Table 19 and FIG. 23 below.

[0203] [Table 19]

[0204]

number

[0205] Here, considering FIG. 23, Table 19, and Equation 7, the CRB-to-interlace allocation method using a block interleaver can ultimately be configured based on "CRB-consecutive interlace index-interleaved interlace index." Furthermore, based on the above, mapping can be performed as shown in FIG. 22 according to the relationship between the CRB and the interleaved interlaces. The block interleaver can be configured to have a relationship with consecutive interlaces according to a predetermined cyclical pattern for every M interlaces (interlace blocks) or according to upper layer configuration. As a specific example, the block interleaver can be configured according to a cyclical pattern for every M interlaces, such as "1->4->2->3->1->4->2->3...." In this case, for example, the relationship between the block interleaver and consecutive interlace indexes can be a predetermined relationship. As another example, the cyclical pattern can be determined according to upper layer configuration.

[0206] Also, a random cyclic block interleaver can be applied to each interlace block (M blocks). For example, in the above example, the cyclic block interleaver can be determined according to a preset pattern or setting. However, the cyclic block interleaver can generate a block interleaver index i determined through a random sequence and apply it cyclically, and the following Equation 8 can be taken into consideration.

[0207] Furthermore, as an example, a Gold sequence of length 31 can be used to generate the random block interleaver index, where the random sequence c(n) can be the same as, but not limited to, Equation 9 below. C = 1600 and the first m-sequence, x1(n), can be initialized by x1(0) = 1, x1(n) = 0, n = 1, 2, ..., 30. Also, the second m-sequence, x2(n), can be initialized by the following Equation 10. At this time, the initialization can be performed by the following Equation 10 based on the initial value determined depending on the situation to which the sequence is applied. Furthermore, as an example, the initial value c of the random sequence c(i) generator for generating the block interleaver index is init is a specific value (e.g., c init = 1010). As another example, the initial value can be at least one of the cast type and the sidelink ID representing the end-to-end link, the sidelink synchronization ID, the BWP or the SL carrier related ID (part) information. The set of block interleaver indexes can be predetermined or can be set by a higher layer.

[0208]

number

[0209]

number

[0210]

number

[0211] As another example, the relationship between the CRB and the interlace index in a non-uniform form can be determined by the following Equation 11 based on a combination of at least one block interleaver and a random function for each interlace block (M blocks).

[0212]

number

[0213] Here, the initial value c of the random sequence c(i) generator init is a specific value (e.g., c init = 1010). As another example, the initial value can be at least one of a sidelink ID, a sidelink synchronization ID, a BWP or a SL carrier related ID (partial) information representing the cast type and the end-to-end link. The set of block interleaver indexes can be predetermined or configured by a higher layer.

[0214] Furthermore, f inter (m) function is as described above, The block interleaver may be configured to interleave sequential interlace indexes of JPEG2025528695000053.jpg1250 to generate interleaved interlace indexes for M interlace RBs independently. Furthermore, a specific offset value generated through a random sequence for each of the M interlaces may be added independently to each of the M interlaces, thereby generating a random interleaving index according to the above-described method. Here, FIG. 24 illustrates a method for setting non-uniform CRB-to-interlace indexes based on a combination of a block interleaver and a random function, which is applicable to the present disclosure.

[0215] Referring to FIG. 24, after applying a specific block interleaver (e.g., 2×3), a random offset value can be added for each of M interlaces. In this case, an interleaved interlace index can be generated independently for each of M interlaces (i.e., k=0, 1, 2, ...). In this case, the relationship between the CRB and the interleaved interlace index can be finally considered, as described above, and the relationship between the CRB and the interleaved interlace index can be set. Here, as shown in FIG. 24, the block interleaver can be set to have an X×Y size according to the size of one interlace block. For example, in the case of five interlaces, a block interleaver structure such as "X×Y={3×2 or 2×3}" can be used based on the five interlaces 0 to 4. After applying the block interleaver structure to the interlaces, a random offset value can be generated independently for each interlace block using a random sequence and added. Then, a "mod M" operation is applied to the interlaced blocks to which the random offset value has been added, and based on this, a non-uniform CRB-to-interlace index assignment can finally be performed, which may be similar to Fig. 24. As another example, random sequence generation within the interlace number can be used to generate random interlace indexes. That is, it is also possible to perform different interlace assignments for each K index using a random sequence generator without using block interleaving for the interlaced blocks.

[0216] FIG. 25 illustrates a method for mapping subchannel indexes constituting a resource pool applicable to the present disclosure to non-consecutive sidelink interlace indexes. Referring to FIG. 25, different interlace indexes for each of M interlaces may be mapped to one subchannel index. As a specific example, subchannel indexing may be defined through a resource pool configuration. Referring to FIG. 25, since the subchannel indexes are configured through a resource pool configuration, subchannel index #0 may be assigned to RB 2510 corresponding to interlace index #0 and RB 2520 corresponding to interlace index #2, which may be different from the above-described configurations shown in FIGS. 20 to 22. That is, the lowest interlace index may be mapped to the lowest subchannel index, or an interlace in an interlace block having the lowest frequency may not be mapped to a subchannel index.

[0217] As an example, Table 20 below shows a case where M=10 and N=5 subchannels are configured in one resource pool based on an interlace structure. Here, two interlace indices are mapped to one subchannel, so k may be 2. On the other hand, Table 21 shows a case where M=10 and N=10 subchannels are configured in one resource pool based on an interlace structure. Here, one interlace index is mapped to one subchannel, so k may be 1. As another example, Table 22 shows a case where M=10 and N=20 subchannels are configured in one resource pool based on an interlace structure. Here, two subchannel indices are mapped to one interlace index, so k may be 1 / 2.

[0218] As an example, since subchannel indexing is defined through one resource pool setting, the allocation relationship between CRBs, interlaces, and subchannels can be set as shown in Tables 20, 21, and 22. As an example, in Tables 20, 21, and 22, based on an M=10-based continuous interlace structure corresponding to 15 kHz SCS, interlaces having various numbers associated with each subchannel can be configured based on the number of subchannels N or the subchannel size (number of RBs).

[0219] Here, as an example, the number of interlace indexes associated with one subchannel may be determined based on the M value and the number N of subchannels configured for one resource pool. As another example, the relationship between interlaces and subchannels may be determined using the number of RBs per subchannel rather than the configured number of subchannels. Based on the above, two interlaces may be associated with one subchannel (Table 20), one interlace may be associated with one subchannel (Table 21), or one interlace may be associated with two subchannels (Table 22) based on the ratio [N:M] between the number of subchannels and the number of interlaces. Therefore, in the sidelink unlicensed spectrum, the number of RBs per subchannel may be automatically determined based on the ratio [N:M] together with the higher layer parameter settings defined for the sidelink.

[0220] [Table 20-1] [Table 20-2] [Table 20-3]

[0221] [Table 21-1] [Table 21-2] [Table 21-3]

[0222] [Table 22-1] [Table 22-2] [Table 22-3] [Table 22-4]

[0223] As another example, FIGS. 26 and 27 are diagrams showing interlace structures applicable to the present disclosure.

[0224] Referring to FIG. 26, this illustrates interlace allocation when M=10 based on 100 RBs in a 15 kHz SCS. Here, N=10 may be possible. That is, one interlace can be mapped to one subchannel. As an example, based on RB 2610 having the lowest interlace index in FIG. 26, each interlace can be mapped to the lowest subchannel index. That is, the frequency resource corresponding to the lowest interlace index #0 of the total 10 interlaces can be mapped to subchannel index #0. Furthermore, the frequency resource corresponding to the next interlace index #1 can be mapped to subchannel index #1. Furthermore, the remaining subchannel indexes #2 to #9 can be mapped in the same manner.

[0225] Here, as an example, Figure 26 may be an interlaced structure with uniform RB spacing, which may be similar to the above-mentioned Option 1-A, while Figure 27 may be an interlaced structure with non-uniform RB spacing, which may be similar to the above-mentioned Option 2-A.

[0226] 26, for example, a case may be considered in which different terminals perform sidelink communication through adjacent interlace indexes (or subchannel indexes). Here, there is a need to minimize the influence of in-band emission (IBE) that may occur due to sidelink communication between different terminals, and therefore, it may be advantageous to configure the interlace index intervals to be non-uniform. That is, there may be an advantage in that the influence of IBE between transmitting terminals located in adjacent positions can be minimized based on the non-uniformly configured interlace structure.

[0227] Furthermore, as an example, in both the uniform interlace structure and the non-uniform interlace structure, as described above, the mapping between the lowest interlace index and the lowest subchannel index can be performed according to the ratio [N:M], as described above. That is, regardless of the different interlace mapping methods of Option 1 and Option 2, the interlace index and subchannel index mapping can differ according to the ratio [N:M]. As an example, when N=1:M=1, interlace index #0 and subchannel index #0 may be mapped to resources associated with each other. Furthermore, the next interlace index #1 and subchannel index #1 may be mapped to resources associated with each other, as described above.

[0228] <Method for instructing frequency resource allocation for unlicensed band sidelink communication>

[0229] FIG. 28 illustrates a sidelink frequency resource allocation method applicable to the present disclosure. Referring to FIG. 28, a receiving terminal performing sidelink communication can receive sidelink control information (SCI) transmitted by a transmitting terminal. The SCI may include a frequency resource assignment field and a time resource assignment field. The transmitting terminal can indicate PSSCH resources from up to three slots through a frequency resource indication value (FRIV) indicated by the frequency resource assignment field and a time resource indication value (TRIV) indicated by the time resource assignment field. For example, the maximum possible time / frequency resource allocation indicated through SCI signaling may be two or three slots. Here, the maximum possible time / frequency resources may be indicated by an RRC parameter (e.g., sl-MaxNumPerReserve) configured based on higher layer signaling.

[0230] For example, if sl-MaxNumPerReserve=2 based on higher layer signaling, the terminal may indicate time / frequency resource reservation for up to two slots. As another example, if sl-MaxNumPerReserve=3 based on higher layer signaling, the terminal may indicate time / frequency resource reservation for up to three slots, which may be similar to Table 23 below.

[0231] [Table 23]

[0232] The receiving terminal can perform blind decoding for PSCCH reception by taking into account the subchannels in the receiving resource pool and the locations of possible candidate PSCCH resources. The receiving terminal can decode the first SCI (1st SCI) using resources 2810 in the received first slot. The receiving terminal can identify resources 2810 assigned to the first slot and next reserved resources 2820 and 2830 based on the resource allocation information in the first slot in which the first SCI was received. For example, based on the above, if Nmax = 2, the receiving terminal can identify resources 2810 assigned to the first slot and resources 2820 assigned to the second slot as the next reserved resources. Also, if Nmax = 3, the receiving terminal can identify resources 2810 assigned to the first slot and resources 2820 assigned to the second slot and resources 2830 assigned to the third slot as the next reserved resources. For example, the receiving terminal can identify the reserved resources through a time / frequency resource allocation field in the received SCI. As a specific example, the FRIV value in the SCI may indicate the start of different subchannels over three slots and the same number of subchannels.

[0233] 28, a receiving terminal can obtain PSSCH transmission resource allocation reservation information in the second and third slots through SCI information on the PSCCH received in the first slot. Here, the receiving terminal can confirm the positions of the second and third slots through a logical channel offset value through a TRIV value in the SCI based on the first slot. Furthermore, frequency allocation information can be provided by indicating the start information of different subchannels and the number of allocated identical subchannels in each slot through an FRIV value.

[0234] Therefore, in the case of the first SCI (PSCCH), the receiving terminal can receive the PSSCH by checking the time / frequency resource indication information field for receiving the TB (Transport Block) expected to be transmitted to the receiving terminal through blind decoding on all available subchannels. Here, if additional scheduling resources exist based on the SCI, the receiving terminal can obtain second or second / third slot / frequency (subchannel) resource allocation information based on the time / frequency resource indication information. Then, the receiving terminal can receive the intended PSCCH / PSSCH on the second or second / third slot / frequency (subchannel) resource based on the resource allocation information.

[0235] Here, as an example, a PSSCH transmission resource allocation method that takes into account the unlicensed band may be considered. As described above, since transmission can be performed in the unlicensed band after channel occupation based on LBT, a PSSCH transmission resource allocation method that takes this into account may be necessary. As an example, the first SCI (PSCCH) may be transmitted based on a specific subchannel / interlace index in the first slot (resource). For example, the lowest subchannel index or the lowest interlace index may be determined as the starting subchannel index or the starting interlace index of the first resource. In this case, the receiving terminal determines the number of allocated subchannels through the FRIV value in the received first SCI. JPEG2025528695000065.jpg1220. In addition, if at least one of the second slot and the third slot is configured and indicated, at least one of the starting subchannel index and the interlace index of the configured resource can be confirmed. In addition, as an example, the receiving terminal can also confirm the signaling format.

[0236] Here, the total number of subchannels in one resource pool is JPEG2025528695000066.jpg1345 can be set to various values ​​based on at least one of the subcarrier spacing, the number of interlaces in the resource pool, and the allocation relationship between subchannels and interlaces. For example, in existing sidelink signaling, the number of subchannels can be set to one value for one resource pool configuration. However, the value can be set to various values ​​taking into account interlace-based RB resource configuration. As a specific example, when the number of interlaces is 5 and the number of subchannels to interlaces is 2 in 30 kHz SCS, the total number of subchannels in one resource pool can be set to one value. JPEG2025528695000067.jpg1345 can be set to 2 or 3, where JPEG2025528695000067.jpg1345 is the total number of subchannels in one resource pool. The signaling method may vary depending on the value set for JPEG2025528695000068.jpg1345. However, the above configuration is merely an example and is not limited thereto.

[0237] As another example, the time resources used in sidelink communication based on higher layer signaling may be determined as two slots or three slots, and the subchannel-based frequency resources in the second slot or the second / third slots may be indicated based on the SCI of the first slot.

[0238] For example, when sl-MaxNumPerReserve is 2 (i.e., when two slots are used), FRIV can indicate frequency resources according to the following Equation 12: If the number of JPEG2025528695000069.jpg1337 is equal to or greater than 'T', frequency resources can be indicated through FRIV according to the following Equation 12. If the number of JPEG2025528695000070.jpg1337 is less than 'T', a bitmap can be used instead of FRIV to indicate the frequency resource. In this case, the length of the bitmap is JPEG2025528695000071.jpg1337. Here, the T value may be set to a specific value, or may be a value determined based on whether indicating by a bitmap is more efficient than the FRIV value. As a specific example, as described above, the number of subchannels in a resource pool may be determined differently depending on the ratio [M:N] of interlaces to subchannels. Here, if a small number of subchannels are required based on the ratio [M:N] of interlaces to subchannels, it may be more efficient to indicate by a bitmap than by an FRIV value. Taking the above into consideration, it may be determined based on the T value whether FRIV and bitmaps are applicable. However, as an example, depending on the method for finally configuring subchannels, JPEG2025528695000072.jpg1337 and the T value without comparing JPEG2025528695000073.jpg1337 value can also be used to apply FRIV or bitmap method, and is not limited to a specific embodiment.

[0239]

number

[0240] As another example, when sl-MaxNumPerReserve is 3 (ie, when three slots are used), FRIV can indicate frequency resources based on the following Equation 13. If the number of JPEG2025528695000075.jpg1337 is equal to or greater than 'T', the frequency resource can be indicated through FRIV based on Equation 13. If the number of JPEG2025528695000076.jpg1337 is less than 'T', the frequency resource can also be indicated through a bitmap. In this case, the length of the bitmap is However, as an example, depending on the method for sub-channel configuration, There is no specific comparison between JPEG2025528695000078.jpg1337 and the T value. The FRIV or bitmap method can also be applied using the value JPEG2025528695000079.jpg1337, and is not limited to a specific embodiment.

[0241]

number

[0242] In Equations 12 and 13, JPEG2025528695000081.jpg1218 may be the starting subchannel index for the second slot resource. JPEG2025528695000082.jpg1218 may be the starting subchannel index for the third slot resource. JPEG2025528695000083.jpg1337 may be the total number of subchannels based on the overall interlace allocation set by a higher layer based on at least one of the CRB-to-interlace allocation and the interlace-subchannel allocation in one resource pool. JPEG2025528695000084.jpg1212 is the number of interlace allocation base subchannels actually allocated It may be determined within JPEG2025528695000085.jpg1358.

[0243] As another example, at least one RBS may be configured in one resource pool. A method for determining and indicating an RBS that will actually transmit a PSSCH from among the at least one RBS configured in the resource pool may be required. As an example, since the PSSCH can be transmitted through consecutive RBSs, consecutive RBS indexes may be indicated through the RIV value. Here, the maximum number of bits for the RBS indication field may be determined based on the maximum number of RBSs configured and the RIV value together with the frequency resource allocation field in the SCI format.

[0244] Also, as an example, a case can be considered in which an upper layer parameter is set to indicate SL-U PSCCH / PSSCH transmission based on a subchannel having an interlace structure in frequency resource allocation within an SCI format (e.g., SCI format 1-A). In this case, if the upper layer parameter sl-MaxNumPerReserve is 2, the bits of the frequency resource allocation field can be determined according to the following Equation 14, where: If the length of JPEG2025528695000086.jpg1337 is equal to 'T', the bits can be determined based on Equation 14. If the length of JPEG2025528695000087.jpg1337 is less than "T", then based on the bitmap JPEG2025528695000088.jpg1337 bits can be used.

[0245]

number

[0246] As another example, when the upper layer parameter sl-MaxNumPerReserve is 3, the bits of the frequency resource allocation field can be determined according to Equation 15 below. If the length of JPEG2025528695000090.jpg1337 is equal to "T", the bits can be determined based on Equation 15. JPEG2025528695000091.jpg1337 can be used, but If JPEG2025528695000092.jpg1337 has length less than "T", then based on the bitmap JPEG2025528695000093.jpg 1337 bits can be used, where the T value may be a value selected considering that the length of the bitmap is more efficient than the RIV value, as described above.

[0247]

number

[0248] Figure 29 is a diagram illustrating a frequency resource allocation method based on a uniform interlace structure that can be applied to the present disclosure. Furthermore, Figure 30 is a diagram illustrating a frequency resource allocation method based on a non-uniform interlace structure that can be applied to the present disclosure.

[0249] 29 and 30 may be frequency allocation methods for three slots when sl-MaxNumPerReserve is set to 3. Also, FIGs. 29 and 30 may be cases where one resource pool is configured based on interlace indexes and subchannel indexes set according to Table 24 below. However, FIGs. 29 and 30 are merely examples for convenience of explanation and are not limited to the above-described embodiments.

[0250] [Table 24]

[0251] Specifically, referring to FIG. 29, resources may be allocated based on subchannel indexes. Here, the subchannel indexes and interlace indexes may be the same as those in FIG. 26. As another example, resource allocation may be performed based on interlace indexes based on an interlace-based RB allocation scheme, and this is not limited to a specific embodiment. As an example, resource allocation may be performed by identifying at least one of a first available interlace index (i.e., interlace index=4) corresponding to the lowest interlace index (or a CRB index included in the lowest interlace index) and an associated lowest subchannel index (i.e., subchannel index=0) through a resource pool configuration in the SL BWP in the frequency domain. Here, the total number of interlaces / subchannels available in the resource pool may be determined based on the interlace / subchannels corresponding to the intersection of the resource pool configuration and the interlace / subchannels.

[0252] For example, the number of interlaces in a carrier bandwidth may be determined based on the frequency band, SCS, LBT BW (RBS BW), and carrier bandwidth. Here, the number of interlaces may be predetermined or configured through higher layer signaling, and is not limited to a specific embodiment. Further, for example, for frequency resource allocation for a sidelink unlicensed band, information such as that shown in Table 25 below may be configured in the terminal through higher layer signaling, and is not limited to a specific embodiment.

[0253] [Table 25]

[0254] FIG. 31 is a flowchart showing a method for allocating sidelink unlicensed band frequency resources applicable to the present disclosure. Referring to FIG. 31, a terminal may acquire resource information for a sidelink unlicensed band of one carrier bandwidth (S3110). Here, resource pool information for the sidelink unlicensed band may be provided to the terminal based on at least one of RBS configuration / index information and interlace / subchannel-based configuration information. Here, in the sidelink unlicensed band resource pool configuration step, the sidelink unlicensed band resource pool may be configured with contiguous frequency resources (Case 1). As another example, in the sidelink unlicensed band resource pool configuration step, the sidelink unlicensed band resource pool may be configured non-contiguous taking into account the interlace structure (Case 2). However, in all of the above cases, an interlace-based frequency resource allocation scheme may be considered. Here, the sidelink unlicensed band resource pool may be configured with interlace-based RB resources taking into account the CRB-to-sidelink interlace index mapping relationship. Furthermore, the sidelink interlace(s) may be mapped to subchannels. Here, as an example, CRB pair interlace indices can be allocated evenly based on an interval M (Option 1). As another example, CRB pair interlace indices can be allocated non-uniformly and non-contiguously (Option 2). Furthermore, each subchannel index constituting one resource pool can be mapped to consecutive sidelink interlace indices (Option A). As another example, each subchannel index constituting one resource pool can be mapped to non-contiguously sidelink interlace indices, as described above (Option B).

[0255] A sidelink unlicensed band resource pool may be configured based on sidelink unlicensed band resource pool configuration information (S3120), and the number of subchannels and RBS for PSSCH transmission may be determined in one sidelink unlicensed band resource pool (S3130). Then, the transmitting terminal may provide information on the determined number of subchannels and RBS for PSSCH transmission to the receiving terminal through an SCI (corresponding to at least one of the PSCCH and the second SCI) (S3140). Here, for example, the maximum number of usable slots may be provided to the terminal through higher layer configuration based on the SCI of the first slot. For example, the maximum number of usable slots may be 2 or 3. Therefore, the transmitting terminal may transmit the PSSCH / PSCCH to the receiving terminal through the first and second slots or the first, second, and third slots. Here, the frequency resource allocation information included in the SCI may indicate the same number of subchannels as the start information of different subchannels for all slots based on the maximum number of usable slots. Here, the number of subchannels for one resource pool is the number of subchannels per interlace, and can be set to various values ​​taking into consideration at least one of the SCS, the number of interlaces in the resource pool, and the subchannel-to-interlace allocation relationship. Furthermore, at least one RBS can be configured in one resource pool. In this case, the RBS to be used for PSSCH transmission among the RBSs configured in the resource pool can be indicated by SCI signaling. For example, the RBS to be used for PSSCH transmission may be indicated to the receiving terminal based on the number of consecutive RBSs from the starting RBS, as described above. Then, the transmitting terminal and the receiving terminal can perform sidelink communication in the sidelink unlicensed band based on the frequency resource information.

[0256] FIG. 32 is a diagram showing a base station apparatus and a terminal apparatus to which the present disclosure can be applied.

[0257] The base station device 3200 may include a processor 3220 , an antenna unit 3212 , a transceiver 3214 , and a memory 3216 .

[0258] The processor 3220 performs baseband-related signal processing and may include an upper layer processing unit 3230 and a physical layer processing unit 3240. The upper layer processing unit 3230 may process operations of a Medium Access Control (MAC) layer, a Radio Resource Control (RRC) layer, or higher layers. The physical layer processing unit 3240 may process operations of a physical (PHY) layer (e.g., uplink receive signal processing, downlink transmit signal processing). In addition to performing baseband-related signal processing, the processor 3220 may control the overall operation of the base station device 3200.

[0259] The antenna unit 3212 may include one or more physical antennas, and when multiple antennas are included, it may support MIMO (Multiple Input Multiple Output) transmission and reception, and may also support beamforming.

[0260] The memory 3216 can store information processed by the processor 3220, software associated with the operation of the base station device 3200, an operating system, applications, etc., and can include components such as buffers.

[0261] The processor 3220 of the base station device 3200 may be configured to perform the operations of the base station in the embodiments described herein.

[0262] The terminal device 3250 may include a processor 3270, an antenna unit 3262, a transceiver 3264, and a memory 3266. As an example, in the present invention, the terminal device 3250 can communicate with the base station device 3200. As another example, in the present invention, the terminal device 3250 can perform sidelink communication with another terminal device. That is, the terminal device 3250 of the present invention refers to a device that can communicate with at least one of the base station device 3200 and another terminal device, and is not limited to communication with a specific device.

[0263] The processor 3270 performs baseband-related signal processing and may include an upper layer processing unit 3280 and a physical layer processing unit 3290. The upper layer processing unit 3280 may process operations of the MAC layer, the RRC layer, or higher layers. The physical layer processing unit 3290 may process operations of the PHY layer (e.g., downlink receive signal processing, uplink transmit signal processing). In addition to performing baseband-related signal processing, the processor 3270 may control the overall operation of the terminal device 3250.

[0264] The antenna unit 3262 may include one or more physical antennas, and when multiple antennas are included, may support MIMO transmission and reception, and may also support beamforming.

[0265] The memory 3266 can store information processed by the processor 3270, software associated with the operation of the terminal device 3250, an operating system, applications, etc., and can include components such as buffers.

[0266] The terminal device 3250 according to an embodiment of the present invention may be associated with a vehicle. For example, the terminal device 3250 may be built into, located in, or located on the vehicle. The terminal device 3250 according to the present invention may also be the vehicle itself. The terminal device 3250 according to the present invention may be at least one of a wearable terminal, an AV / VR terminal, an IoT terminal, a robot terminal, and a public safety terminal. The terminal device 3250 to which the present invention is applicable may include any of various types of communication devices that support interactive services using a sidelink for services such as Internet connection, service execution, navigation, real-time information, autonomous driving, safety, and hazard diagnosis. The terminal device 3250 may also include any type of communication device that can perform a sidelink operation, such as an AR / VR device, or a sensor that performs a relay operation.

[0267] Here, vehicles to which the present invention is applicable may include autonomous vehicles, semi-autonomous vehicles, non-autonomous vehicles, etc. Meanwhile, although the terminal device 3250 according to an example of the present invention is described as being associated with a vehicle, one or more of the UEs may not be associated with a vehicle. This is merely an example, and the application of the present invention should not be construed as being limited by the described example.

[0268] In addition, the terminal device 3250 according to an embodiment of the present invention may include various types of communication devices that can cooperate to support an interactive service using a sidelink. That is, the terminal device 3250 can be used not only to directly support an interactive service using a sidelink, but also as a cooperating device to support an interactive service using a sidelink.

[0269] Further, as an example, the terminal device 3250 may acquire resource information for a sidelink unlicensed band of one carrier bandwidth. Here, resource pool information for the sidelink unlicensed band may be provided to the terminal device 3250 based on at least one of RBS configuration / index information and interlace / subchannel-based configuration information. Here, as an example, in the sidelink unlicensed band resource pool configuration step, the sidelink unlicensed band resource pool may be configured with contiguous frequency resources (Case 1). As another example, in the sidelink unlicensed band resource pool configuration step, the sidelink unlicensed band resource pool may be configured non-contiguous taking into account the interlace structure (Case 2). However, in all of the above cases, an interlace-based frequency resource allocation scheme may be considered. Here, the sidelink unlicensed band resource pool may be configured with interlace-based RB resources taking into account the CRB-to-sidelink interlace index mapping relationship. Furthermore, the sidelink interlace(s) may be mapped to subchannels. Here, as an example, the CRB-to-interlace index may be allocated based on a uniform interval M (Option 1). As another example, CRB pair interlace indices can be allocated non-uniformly and non-contiguously (Option 2). Furthermore, each subchannel index constituting one resource pool can be mapped to consecutive sidelink interlace indices (Option A). As another example, each subchannel index constituting one resource pool can be mapped to non-contiguously sidelink interlace indices, as described above (Option B).

[0270] A sidelink unlicensed band resource pool may be configured based on the sidelink unlicensed band resource pool configuration information, and the number of subchannels and RBS for PSSCH transmission may be determined in one sidelink unlicensed band resource pool. Then, the terminal device 3250 may provide frequency resource allocation information to other terminal devices through an SCI based on the determined number of subchannels and RBS for PSSCH transmission. Here, for example, the maximum number of available slots may be provided to the terminal by higher layer configuration based on the SCI of the first slot. For example, the maximum number of available slots may be 2 or 3. Thus, the transmitting terminal may transmit PSSCH to the receiving terminal through the first and second slots or the first, second, and third slots. Here, the frequency resource allocation information included in the SCI may indicate the same number of subchannels as the start information of different subchannels for all slots based on the maximum number of available slots. Here, the number of subchannels for one resource pool is the number of subchannels per interlace, and may be set to various values ​​taking into account at least one of the SCS, the number of interlaces in the resource pool, and the allocation relationship between subchannels and interlaces. Furthermore, at least one RBS may be configured in one resource pool. At this time, the RBS to be used for PSSCH transmission among the RBSs configured in the resource pool can be indicated. For example, the RBS to be used for PSSCH transmission may be indicated to the receiving terminal based on the number of consecutive RBSs from the starting RBS, as described above. Thereafter, the transmitting terminal and the receiving terminal can perform sidelink communication in the sidelink unlicensed band based on the frequency resource information.

[0271] Furthermore, various embodiments of the present disclosure may be implemented using hardware, firmware, software, or a combination thereof, etc. In the case of a hardware implementation, the implementation may be using 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.

[0272] The scope of the present disclosure includes software or machine-executable instructions (e.g., operating systems, applications, firmware, programs, etc.) that cause the operations of the methods of the various embodiments to be performed on a device or computer, as well as non-transitory computer-readable media on which such software or instructions are stored and which can be executed on a device or computer.

[0273] The various embodiments of the present disclosure do not enumerate all possible combinations, but are intended to describe representative aspects of the present disclosure, and the matters described in the various embodiments may be applied independently or in combination of two or more. [Industrial Applicability]

[0274] The above may also be applied to other systems.

Claims

1. 1. A method for configuring a sidelink resource pool in a terminal in a wireless communication system, comprising: receiving resource pool configuration information from the base station based on higher layer signaling by the terminal; Transmitting sidelink control information (SCI) to other terminals based on the resource pool configuration information; and performing sidelink communication with the other terminal; A sidelink resource pool configuration method, wherein the resource pool configuration information is information based on a sidelink resource pool configuration of an unlicensed band.

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

3. 3. The method of claim 2, further comprising determining a common resource block (CRB) to interlace index mapping and an interlace index to subchannel index mapping based on sidelink resource pool configuration information for the unlicensed band.

4. 2. The method of claim 1, further comprising: indicating the number of subchannels and RBS of resources for PSSCH (physical sidelink shared channel) transmission in the sidelink resource pool based on the SCI.

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

Images