Method and apparatus for performing congestion control in NR V2X

Abstract

A method for performing wireless communication by a first device and a device supporting the method are provided. The method may include the following steps: receiving a physical sidelink control channel (PSCCH) from a second device; receiving a physical sidelink shared channel (PSSCH) associated with the PSCCH from the second device; determining a physical sidelink feedback channel (PSFCH) resource associated with the PSSCH based on a time slot and a subchannel associated with the PSSCH; and obtaining a channel busy rate (CBR) value associated with PSFCH transmission on the PSFCH resource. The CBR value may be obtained based on (i) a first time slot before a first offset from a time slot in which the PSSCH associated with the PSFCH resource is received and (ii) a measurement in a time period between the first time slot and a second time slot before a second offset.

Description

Technical Field

[0001] The present disclosure relates to wireless communication systems. Background Art

[0002] Sidelink (SL) communication is a communication scheme in which a direct link is established between user equipments (UEs) and the UEs directly exchange voice and data with each other without intervention of an evolved Node B (eNB). SL communication is being considered as a solution to eNB overhead caused by the rapid growth of data traffic.

[0003] V2X (Vehicle to Everything) refers to the communication technology used by vehicles to exchange information with other vehicles, pedestrians, and objects equipped with infrastructure. V2X can be divided into four types such as V2V (Vehicle to Vehicle), V2I (Vehicle to Infrastructure), V2N (Vehicle to Network), and V2P (Vehicle to Pedestrian). V2X communication can be provided through the PC5 interface and / or the Uu interface.

[0004] In addition, as more and more communication devices require larger communication capacity, mobile broadband communication enhanced relative to traditional radio access technology (RAT) is required. Therefore, the design of communication systems taking into account UEs or services that are sensitive to reliability and latency has also been discussed, and the next generation of radio access technologies taking into account enhanced mobile broadband communication, large-scale MTC, and ultra-reliable low-latency communication (URLLC), etc., can be referred to as new RAT (radio access technology) or NR (new radio). Here, NR can also support vehicle-to-everything (V2X) communication.

[0005] Figure 1 is a diagram for describing NR-based V2X communication compared with V2X communication based on a RAT used before NR. Figure 1 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0006] Regarding V2X communication, when discussing the RAT used before NR, the focus is on the scheme of providing safety services based on V2X messages such as BSM (Basic Safety Message), CAM (Cooperative Awareness Message) and DENM (Decentralized Environment Notification Message). V2X messages may include location information, dynamic information, attribute information, etc. For example, a UE may send a periodic message type CAM and / or an event-triggered message type DENM to another UE.

[0007] For example, CAM may include dynamic state information of the vehicle such as direction and speed, static data of the vehicle such as size, and basic vehicle information such as external lighting status, route details, etc. For example, UE may broadcast CAM, and the latency of CAM may be less than 100ms. For example, UE may generate DENM and send it to another UE in an unexpected situation such as vehicle failure, accident, etc. For example, all vehicles within the transmission range of UE can receive CAM and / or DENM. In this case, DENM may have a higher priority than CAM.

[0008] Since then, various V2X scenarios have been proposed in NR regarding V2X communication. For example, these various V2X scenarios may include vehicle platooning, advanced driving, extended sensors, remote driving, etc.

[0009] For example, based on vehicle platooning, vehicles can move together by dynamically forming groups. For example, in order to perform platooning operations based on vehicle formation, vehicles belonging to the group can receive periodic data from the leading vehicle. For example, vehicles belonging to the group can reduce or increase the interval between vehicles by using the periodic data.

[0010] For example, based on advanced driving, the vehicles can be semi-autonomous or fully autonomous. For example, each vehicle can adjust trajectory or maneuver based on data obtained from local sensors of nearby vehicles and / or nearby logical entities. In addition, for example, each vehicle can share driving intentions with nearby vehicles.

[0011] For example, based on the extended sensors, raw data, processed data or real-time video data obtained by local sensors can be exchanged between the vehicle, the logical entity, the pedestrian UE and / or the V2X application server, so that, for example, the vehicle can recognize a further improved environment compared to the environment detected using its own sensors.

[0012] For example, based on remote driving, for a person or remote vehicle that cannot drive in a dangerous environment, a remote driver or V2X application can operate or control the remote vehicle. For example, if the route is predictable (such as public transportation), cloud computing-based driving can be used for the operation or control of the remote vehicle. In addition, for example, access to a cloud-based backend service platform can be considered for remote driving.

[0013] In addition, schemes for specifying service requirements for various V2X scenarios such as vehicle platooning, advanced driving, extended sensors, remote driving, etc. are discussed in NR-based V2X communications. Summary of the invention

[0014] Technical issues

[0015] Meanwhile, in conventional NR V2X, only PSCCH / PSSCH-related CBR measurement and congestion control can be supported. Therefore, according to changes in the interference level on the (preconfigured) PSFCH resource domain, there may be limitations in adaptively ensuring the performance of the PSFCH having performance requirements different from those of the PSCCH / PSSCH. In addition, because there are also PSCCH / PSSCHs that do not require SL HARQ feedback (via PSFCH) among the PSCCH / PSSCHs transmitted on the (preconfigured) PSCCH / PSSCH resource domain, it may be difficult to consider the interference level (e.g., CBR measured in the PSCCH / PSSCH resource domain) (accurately) represents the interference level of the PSFCH resource domain. Therefore, it is necessary to propose a method for UE to perform congestion control and a device supporting the method.

[0016] Technical Solution

[0017] In one embodiment, a method for performing wireless communication by a first device is provided. The method may include: receiving a physical sidelink control channel (PSCCH) from a second device; receiving a physical sidelink shared channel (PSSCH) associated with the PSCCH from the second device; determining a physical sidelink feedback channel (PSFCH) resource associated with the PSSCH based on a subchannel and a time slot associated with the PSSCH; and obtaining a channel busy rate (CBR) value associated with a PSFCH transmission on the PSFCH resource, wherein the CBR value is obtained based on a measurement in a time interval between (i) a first time slot before a first offset from a time slot in which the PSSCH associated with the PSFCH resource is received and (ii) a second time slot before a second offset from the first time slot.

[0018] In one embodiment, a first device configured to perform wireless communication is provided. The first device may include: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. The one or more processors may execute instructions to: receive a physical sidelink control channel (PSCCH) from a second device; receive a physical sidelink shared channel (PSSCH) associated with the PSCCH from a second device; determine a physical sidelink feedback channel (PSFCH) resource associated with the PSSCH based on a subchannel and a time slot associated with the PSSCH; and obtain a channel busy rate (CBR) value associated with a PSFCH transmission on the PSFCH resource, wherein the CBR value is obtained based on a measurement in a time interval between (i) a first time slot before a first offset of a time slot in which the PSSCH associated with the PSFCH resource is received and (ii) a second time slot before a second offset of the first time slot.

[0019] Effects of the present disclosure

[0020] The user equipment (UE) can efficiently perform SL communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a diagram for describing NR-based V2X communication compared with V2X communication based on a RAT used before NR.

[0022] Figure 2 The structure of the NR system according to an embodiment of the present disclosure is shown.

[0023] Figure 3 The functional division between NG-RAN and 5GC according to an embodiment of the present disclosure is shown.

[0024] Figure 4 A radio protocol architecture according to an embodiment of the present disclosure is shown.

[0025] Figure 5 The structure of the NR system according to an embodiment of the present disclosure is shown.

[0026] Figure 6 The structure of the time slot of the NR frame according to an embodiment of the present disclosure is shown.

[0027] Figure 7 An example of a BWP according to an embodiment of the present disclosure is shown.

[0028] Figure 8 A radio protocol architecture for SL communication according to an embodiment of the present disclosure is shown.

[0029] Fig. 9 A UE performing V2X or SL communication according to an embodiment of the present disclosure is shown.

[0030] Fig.10 A process of performing V2X or SL communication by a UE based on a transmission mode according to an embodiment of the present disclosure is shown.

[0031] Fig.11 Three playback types according to an embodiment of the present disclosure are shown.

[0032] Fig.12 The resource unit used for CBR measurement according to the embodiment of the present disclosure is shown.

[0033] Fig.13 A method for a UE to determine a CBR measurement window based on an embodiment of the present disclosure is shown.

[0034] Fig.14A method for a UE to determine a CBR measurement window based on an embodiment of the present disclosure is shown.

[0035] Fig.15 A method for a UE to determine a CBR measurement window based on an embodiment of the present disclosure is shown.

[0036] Fig.16 A method for a UE that has received multiple PSCCHs / PSSCHs to transmit a PSFCH according to an embodiment of the present disclosure is shown.

[0037] Fig.17 A method for a UE to determine a CBR measurement window based on an embodiment of the present disclosure is shown.

[0038] Fig.18 A method for a first device to perform wireless communication based on an embodiment of the present disclosure is shown.

[0039] Fig.19 A communication system 1 according to an embodiment of the present disclosure is shown.

[0040] Fig. 20 A wireless device according to an embodiment of the present disclosure is shown.

[0041] Fig.21 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown.

[0042] Fig. 22 A wireless device according to an embodiment of the present disclosure is shown.

[0043] Fig.23 A handheld device according to an embodiment of the present disclosure is shown.

[0044] Fig.24 A vehicle or autonomous vehicle according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0045] In this specification, "A or B" may mean "only A", "only B", or "both A and B". In other words, in this specification, "A or B" may be interpreted as "A and / or B". For example, in this specification, "A, B or C" may mean "only A", "only B", "only C", or "any combination of A, B, C".

[0046] A slash ( / ) or a comma used in this specification may mean "and / or". For example, "A / B" may mean "A and / or B". Thus, "A / B" may mean "only A", "only B", or "both A and B". For example, "A, B, C" may mean "A, B, or C".

[0047] In the present specification, "at least one of A and B" may mean "only A", "only B", or "both A and B". In addition, in the present specification, the expression "at least one of A or B" or "at least one of A and / or B" may be interpreted as "at least one of A and B".

[0048] In addition, in the present specification, "at least one of A, B, and C" may mean "only A", "only B", "only C", or "any combination of A, B, and C". In addition, "at least one of A, B, or C" or "at least one of A, B and / or C" may mean "at least one of A, B, and C".

[0049] In addition, brackets used in this specification may mean "for example". Specifically, when indicated as "control information (PDCCH)", this may mean that "PDCCH" is proposed as an example of "control information". In other words, the "control information" of this specification is not limited to "PDCCH", and "PDDCH" may be proposed as an example of "control information". Specifically, when indicated as "control information (ie, PDCCH)", this may also mean that "PDCCH" is proposed as an example of "control information".

[0050] The technical features respectively described in one drawing in this specification may be implemented separately or may be implemented simultaneously.

[0051] The techniques described below can be used in various wireless communication systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. CDMA can be implemented using radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA-2000. TDMA can be implemented using radio technologies such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA can be implemented using radio technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA), etc. IEEE 802.16m is an evolved version of IEEE 802.16e and provides backward compatibility for systems based on IEEE 802.16e. UTRA is part of Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is a part of Evolved UMTS (E-UMTS) using E-UTRA. 3GPP LTE uses OFDMA in the downlink and SC-FDMA in the uplink. LTE-Advanced (LTE-A) is an evolution of LTE.

[0052] 5G NR is a subsequent technology of LTE-A corresponding to a new mobile communication system with high performance, low latency, high availability, etc. 5G NR can use all available spectrum resources including low frequency bands less than 1 GHz, intermediate frequency bands from 1 GHz to 10 GHz, and high frequency (millimeter wave) above 24 GHz.

[0053] For the sake of clarity, the following description will mainly focus on LTE-A or 5G NR. However, the technical features of the embodiments of the present disclosure will not be limited thereto.

[0054] Figure 2 The structure of the NR system according to an embodiment of the present disclosure is shown. Figure 2 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0055] Reference Figure 2, the next generation radio access network (NG-RAN) may include a BS 20 that provides user plane and control plane protocol terminations to the UE 10. For example, the BS 20 may include a next generation Node B (gNB) and / or an evolved Node B (eNB). For example, the UE 10 may be fixed or mobile and may be referred to as other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device, etc. For example, the BS may be referred to as a fixed station that communicates with the UE 10 and may be referred to as other terms such as a base transceiver system (BTS), an access point (AP), etc.

[0056] Figure 2 The embodiment of the present invention illustrates a case where only gNB is included. The BSs 20 may be connected to each other via an Xn interface. The BSs 20 may be connected to each other via a fifth generation (5G) core network (5GC) and an NG interface. More specifically, the BSs 20 may be connected to an access and mobility management function (AMF) 30 via an NG-C interface, and may be connected to a user plane function (UPF) 30 via an NG-U interface.

[0057] Figure 3 The functional division between NG-RAN and 5GC according to an embodiment of the present disclosure is shown.

[0058] Reference Figure 3 , gNB can provide functions such as inter-cell radio resource management (inter-cell RRM), radio bearer (RB) control, connection mobility control, radio admission control, measurement configuration and provision, dynamic resource allocation, etc. AMF can provide functions such as non-access stratum (NAS) security, idle state mobility processing, etc. UPF can provide functions such as mobility anchoring, protocol data unit (PDU) processing, etc. Session management function (SMF) can provide functions such as user equipment (UE) Internet protocol (IP) address allocation, PDU session control, etc.

[0059] The radio interface protocol layer between the UE and the network can be classified into the first layer (L1), the second layer (L2), and the third layer (L3) based on the lower three layers of the open system interconnection (OSI) model known in the communication system. Here, the physical (PHY) layer belonging to the first layer provides an information transmission service using a physical channel, and the radio resource control (RRC) layer located at the third layer controls radio resources between the UE and the network. To this end, the RRC layer exchanges RRC messages between the UE and the BS layer.

[0060] Figure 4 A radio protocol architecture according to an embodiment of the present disclosure is shown. Figure 4The embodiments of can be combined with various embodiments of the present disclosure. Specifically, Figure 4 (a) shows the radio protocol architecture for the user plane, and Figure 4 (b) in FIG. 4 shows a radio protocol architecture for a control plane. The user plane corresponds to a protocol stack for user data transmission, and the control plane corresponds to a protocol stack for control signal transmission.

[0061] Reference Figure 4 , the physical layer provides information transfer services to the upper layer through the physical channel. The physical layer is connected to the medium access control (MAC) layer, which is the upper layer of the physical layer, through the transport channel. Data is transferred between the MAC layer and the physical layer through the transport channel. The transport channel is classified according to how the data is transmitted through the radio interface and what characteristics of the data it transmits.

[0062] Data is transmitted through a physical channel between different PHY layers (ie, a PHY layer of a transmitter and a PHY layer of a receiver). The physical channel may be modulated using an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and uses time and frequency as radio resources.

[0063] The MAC layer provides services to the Radio Link Control (RLC) layer via logical channels, and the RLC layer is a higher layer of the MAC layer. The MAC layer provides a function of mapping multiple logical channels to multiple transport channels. The MAC layer also provides a function of logical channel multiplexing by mapping multiple logical channels to a single transport channel. The MAC layer provides data transmission services through logical channels.

[0064] The RLC layer performs concatenation, segmentation, and reassembly of Radio Link Control Service Data Units (RLC SDUs). In order to ensure different Quality of Service (QoS) required by Radio Bearers (RBs), the RLC layer provides three types of operation modes, namely, Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). AM RLC provides error correction through Automatic Repeat Request (ARQ).

[0065] The Radio Resource Control (RRC) layer is defined only in the control plane. And, the RRC layer performs the function of controlling physical channels, transport channels, and logical channels related to configuration, reconfiguration, and release of radio bearers. RB refers to a logical path provided by the first layer (i.e., the PHY layer) and the second layer (i.e., the MAC layer, the RLC layer, and the PDCP layer) to transmit data between the UE and the network.

[0066] The functions of the Packet Data Convergence Protocol (PDCP) in the user plane include transmission, header compression and encryption of user data. The functions of the Packet Data Convergence Protocol (PDCP) in the control plane include transmission and encryption / integrity protection of control plane data.

[0067] The Service Data Adaptation Protocol (SDAP) layer is defined only in the user plane. The SDAP layer performs mapping between Quality of Service (QoS) flows and Data Radio Bearers (DRBs) and QoS Flow ID (QFI) marking in both DL and UL packets.

[0068] Configuration of RB refers to the process for specifying radio protocol layers and channel attributes to provide a specific service and for determining corresponding detailed parameters and operation methods. RB can then be classified into two types, namely, signaling radio bearer (SRB) and data radio bearer (DRB). SRB is used as a path for sending RRC messages in the control plane, and DRB is used as a path for sending user data in the user plane.

[0069] When the RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in the RRC connected (RRC_CONNECTED) state, otherwise the UE can be in the RRC idle (RRC_IDLE) state. In the case of NR, the RRC inactive (RRC_INACTIVE) state is additionally defined, and the UE in the RRC_INACTIVE state can maintain the connection with the core network and release its connection with the BS.

[0070] The downlink transmission channels for sending (or transmitting) data from the network to the UE include a broadcast channel (BCH) for sending system information and a downlink shared channel (SCH) for sending other user services or control messages. The services or control messages of downlink multicast or broadcast services can be sent via the downlink SCH or can be sent via a separate downlink multicast channel (MCH). In addition, the uplink transmission channels for sending (or transmitting) data from the UE to the network include a random access channel (RACH) for sending initial control messages and an uplink shared channel (SCH) for sending other user services or control messages.

[0071] Examples of logical channels belonging to a higher layer of a transport channel and mapped to a transport channel may include a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), a multicast traffic channel (MTCH), etc.

[0072] The physical channel is configured by multiple OFDM symbols in the time domain and multiple subcarriers in the frequency domain. A subframe is configured by multiple OFDM symbols in the time domain. A resource block is configured by multiple subcarriers and multiple OFDM symbols in a resource allocation unit. In addition, each subframe can use a specific subcarrier of a specific OFDM symbol (e.g., the first OFDM symbol) of the corresponding subframe of the physical downlink control channel (PDCCH), i.e., the L1 / L2 control channel. The transmission time interval (TTI) refers to the unit time of subframe transmission.

[0073] Figure 5 The structure of the NR system according to an embodiment of the present disclosure is shown. Figure 5 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0074] Reference Figure 5 In NR, a radio frame can be used to perform uplink and downlink transmissions. The length of a radio frame is 10ms and can be defined as consisting of two half frames (HF). A half frame can include five 1ms subframes (SF). A subframe (SF) can be divided into one or more time slots, and the number of time slots within a subframe can be determined according to the subcarrier spacing (SCS). Each time slot can include 12 or 14 OFDM (A) symbols depending on the cyclic prefix (CP).

[0075] When a normal CP is used, each time slot may include 14 symbols. When an extended CP is used, each time slot may include 12 symbols. Herein, a symbol may include an OFDM symbol (or a CP-OFDM symbol) and a single carrier-FDMA (SC-FDMA) symbol (or a discrete Fourier transform spread OFDM (DFT-s-OFDM) symbol).

[0076] Table 1 below shows the number of time slots (N) of each symbol according to the SCS setting (μ) when the normal CP is used. slot symb ), the number of time slots per frame (N frame,μ slot ) and the number of time slots per subframe (N subframe,μ slot ).

[0077] [Table 1]

[0078] <![CDATA[SCS(15*2 μ )]]> <![CDATA[N slot symb ]]> <![CDATA[N frame,μ slot ]]> <![CDATA[N subframe,μ slot ]]> 15KHz(μ=0) 14 10 1 30KHz(μ=1) 14 20 2 60KHz(μ=2) 14 40 4 120KHz(μ=3) 14 80 8 240KHz(μ=4) 14 160 16

[0079] Table 2 shows an example of the number of symbols per slot, the number of slots per frame, and the number of slots per subframe according to the SCS in the case of using the extended CP.

[0080] [Table 2]

[0081] <![CDATA[SCS(15*2 μ )]]> <![CDATA[N slot symb ]]> <![CDATA[N frame,μ slot ]]> <![CDATA[N subframe,μ slot ]]> 60KHz(μ=2) 12 40 4

[0082] In the NR system, OFDM (A) parameter sets (e.g., SCS, CP length, etc.) between multiple cells integrated into one UE may be configured differently. Therefore, the (absolute time) duration (or interval) of a time resource (e.g., a subframe, a time slot, or a TTI) (collectively referred to as a time unit (TU) for simplicity) consisting of the same number of symbols may be configured differently in the integrated cells.

[0083] In NR, multiple parameter sets or SCSs can be supported to support various 5G services. For example, with an SCS of 15kHz, a wide range of traditional cellular bands can be supported, and with an SCS of 30kHz / 60kHz, dense cities, lower latency, and wider carrier bandwidths can be supported. With an SCS of 60kHz or higher, bandwidths greater than 24.25GHz can be used to overcome phase noise.

[0084] The NR frequency band may be defined as two different types of frequency ranges. The two different types of frequency ranges may be FR1 and FR2. The values ​​of the frequency ranges may be changed (or varied), for example, the two different types of frequency ranges may be as shown in Table 3 below. Among the frequency ranges used in the NR system, FR1 may mean "a range below 6 GHz", and FR2 may mean "a range above 6 GHz", and may also be referred to as millimeter wave (mmW).

[0085] [Table 3]

[0086] Frequency range specification Corresponding frequency range Subcarrier Spacing (SCS) FR1 450MHz–6000MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

[0087] As described above, the value of the frequency range in the NR system may be changed (or varied). For example, as shown in Table 4 below, FR1 may include a bandwidth in the range of 410 MHz to 7125 MHz. More specifically, FR1 may include frequency bands of 6 GHz (or 5850, 5900, 5925 MHz, etc.) and higher. For example, the frequency bands of 6 GHz (or 5850, 5900, 5925 MHz, etc.) and higher included in FR1 may include unlicensed frequency bands. Unlicensed frequency bands may be used for various purposes, for example, unlicensed frequency bands are used for vehicle-specific communications (e.g., autonomous driving).

[0088] [Table 4]

[0089] Frequency range specification Corresponding frequency range Subcarrier Spacing (SCS) FR1 410MHz–7125MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

[0090] Figure 6 The structure of the time slot of the NR frame according to an embodiment of the present disclosure is shown. Figure 6The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0091] Reference Figure 6 , a time slot includes multiple symbols in the time domain. For example, in the case of normal CP, one time slot may include 14 symbols. For example, in the case of extended CP, one time slot may include 12 symbols. Alternatively, in the case of normal CP, one time slot may include 7 symbols. However, in the case of extended CP, one time slot may include 6 symbols.

[0092] A carrier includes multiple subcarriers in the frequency domain. A resource block (RB) can be defined as multiple consecutive subcarriers in the frequency domain (e.g., 12 subcarriers). A bandwidth part (BWP) can be defined as multiple consecutive (physical) resource blocks ((P)RBs) in the frequency domain, and a BWP can correspond to a parameter set (e.g., SCS, CP length, etc.). A carrier can include up to N BWPs (e.g., 5 BWPs). Data communication can be performed via an activated BWP. Each element can be referred to as a resource element (RE) in a resource grid, and a complex symbol can be mapped to each element.

[0093] In addition, the radio interface between a UE and another UE or the radio interface between a UE and a network may include an L1 layer, an L2 layer, and an L3 layer. In various embodiments of the present disclosure, the L1 layer may refer to a physical layer. In addition, for example, the L2 layer may refer to at least one of a MAC layer, an RLC layer, a PDCP layer, and an SDAP layer. In addition, for example, the L3 layer may refer to an RRC layer.

[0094] Hereinafter, the bandwidth part (BWP) and the carrier will be described in detail.

[0095] A BWP may be a contiguous set of physical resource blocks (PRBs) within a given parameter set. A PRB may be selected from a contiguous set of common resource blocks (CRBs) for a given parameter set on a given carrier.

[0096] When bandwidth adaptation (BA) is used, the reception bandwidth and transmission bandwidth of the user equipment (UE) are not required to be as wide (or large) as the bandwidth of the cell, and the reception bandwidth and transmission bandwidth of the UE can be controlled (or adjusted). For example, the UE can receive information / configuration for bandwidth control (or adjustment) from the network / base station. In this case, bandwidth control (or adjustment) can be performed based on the received information / configuration. For example, bandwidth control (or adjustment) can include a reduction / expansion of bandwidth, a change in the position of bandwidth, or a change in the subcarrier spacing of bandwidth.

[0097] For example, the bandwidth may be reduced during a duration with little activity in order to save power. For example, the location of the bandwidth may be relocated (or moved) from the frequency domain. For example, the location of the bandwidth may be relocated (or moved) from the frequency domain in order to enhance scheduling flexibility. For example, the subcarrier spacing of the bandwidth may be changed. For example, the subcarrier spacing of the bandwidth may be changed in order to permit different services. A subset of the total cell bandwidth of a cell may be referred to as a bandwidth part (BWP). BA may be performed when the base station / network configures a BWP for a UE and when the base station / network notifies the UE of the BWP that is currently activated among the BWPs.

[0098] For example, the BWP may be at least any one of an active BWP, an initial BWP, and / or a default BWP. For example, the UE may not monitor the downlink radio link quality in a DL BWP other than an activated DL BWP on a primary cell (PCell). For example, the UE may not receive a PDCCH, a physical downlink shared channel (PDSCH), or a channel state information-reference signal (CSI-RS) (excluding RRM) other than an activated DL BWP. For example, the UE may not trigger a channel state information (CSI) report for an unactivated DL BWP. For example, the UE may not send a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH) other than an activated UL BWP. For example, in the case of a downlink, the initial BWP may be given as a set of contiguous RBs for a remaining minimum system information (RMSI) control resource set (CORESET) (configured by a physical broadcast channel (PBCH)). For example, in the case of an uplink, the initial BWP may be given by a system information block (SIB) for a random access procedure. For example, a default BWP may be configured by a higher layer. For example, the initial value of the default BWP may be the initial DL BWP.To save energy, if the UE cannot detect downlink control information (DCI) during a specified period, the UE may switch the active BWP of the UE to the default BWP.

[0099] In addition, a BWP can be defined for SL. The same SL BWP can be used for transmission and reception. For example, a transmitting UE can send a SL channel or a SL signal within a specific BWP, and a receiving UE can receive a SL channel or a SL signal within the same specific BWP. In a licensed carrier, the SL BWP can be defined separately from the Uu BWP, and the SL BWP can have configuration signaling separate from the Uu BWP. For example, the UE can receive a configuration for the SL BWP from the base station / network. The SL BWP can be configured (in advance) for out-of-coverage NR V2X UEs and RRC_IDLE UEs. For UEs operating in RRC_CONNECTED mode, at least one SL BWP can be activated within the carrier.

[0100] Figure 7 An example of a BWP according to an embodiment of the present disclosure is shown. Figure 7 The embodiments of can be combined with various embodiments of the present disclosure. Figure 7 In an implementation manner, the number of BWPs is 3.

[0101] Reference Figure 7 , a common resource block (CRB) may be a carrier resource block numbered from one end of a carrier frequency band to the other end thereof. Additionally, a PRB may be a resource block numbered within each BWP. Point A may indicate a common reference point of a resource block grid.

[0102] It can be obtained by point A, the offset relative to point A (N start BWP ) and bandwidth (N size BWP ) to configure the BWP. For example, point A can be an external reference point of the PRBs of the carrier, and subcarrier 0 of all parameter sets (e.g., all parameter sets supported by the network on the corresponding carrier) are aligned in point A. For example, the offset can be the PRB distance between the lowest subcarrier within a given parameter set and point A. For example, the bandwidth can be the number of PRBs within a given parameter set.

[0103] Hereinafter, V2X or SL communication will be described.

[0104] Figure 8 A radio protocol architecture for SL communication according to an embodiment of the present disclosure is shown. Figure 8 The embodiments of can be combined with various embodiments of the present disclosure. More specifically, Figure 8 (a) in FIG. 1 shows a user plane protocol stack, and Figure 8 (b) in FIG. 5 shows the control plane protocol stack.

[0105] Next, the side link synchronization signal (SLSS) and the synchronization information will be described in detail.

[0106] The SLSS may include a primary side link synchronization signal (PSSS) and a secondary side link synchronization signal (SSSS) as SL specific sequences. The PSSS may be referred to as a side link primary synchronization signal (S-PSS), and the SSSS may be referred to as a side link secondary synchronization signal (S-SSS). For example, an M sequence of length 127 may be used for the S-PSS, and a Gold sequence of length 127 may be used for the S-SSS. For example, the UE may use the S-PSS for initial signal detection and synchronization acquisition. For example, the UE may use the S-PSS and the S-SSS for acquiring detailed synchronization and for detecting a synchronization signal ID.

[0107] The physical sidelink broadcast channel (PSBCH) can be a (broadcast) channel for sending default (system) information, which the UE must first know before SL signal transmission / reception. For example, the default information can be information related to SLSS, duplex mode (DM), time division duplex (TDD) uplink / downlink (UL / DL) configuration, information related to resource pool, type of application related to SLSS, subframe offset, broadcast information, etc. For example, in order to evaluate PSBCH performance, in NR V2X, the payload size of PSBCH can be 56 bits, including a 24-bit cyclic redundancy check (CRC).

[0108] S-PSS, S-SSS, and PSBCH can be included in a block format that supports periodic transmission (e.g., SL synchronization signal (SS) / PSBCH block, hereinafter, sidelink synchronization signal block (S-SSB)). The S-SSB can have the same parameter set (i.e., SCS and CP length) as the physical sidelink control channel (PSCCH) / physical sidelink shared channel (PSSCH) in the carrier, and the transmission bandwidth can exist within the (pre-) configured sidelink (SL) BWP. For example, the S-SSB can have a bandwidth of 11 resource blocks (SBs). For example, the PSBCH can exist across 11 RBs. In addition, the frequency position of the S-SSB can be (pre-) configured. Therefore, the UE does not have to perform hypothesis detection at the frequency to discover the S-SSB in the carrier.

[0109] Fig. 9 A UE performing V2X or SL communication according to an embodiment of the present disclosure is shown. Fig. 9 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0110] Reference Fig. 9In V2X or SL communication, the term "UE" may generally refer to a user's UE. However, if a network device such as a BS transmits / receives signals according to a communication scheme between UEs, the BS may also be regarded as a type of UE. For example, UE 1 may be a first device 100, and UE 2 may be a second device 200.

[0111] For example, UE 1 may select a resource unit corresponding to a specific resource in a resource pool meaning a set of resource series. In addition, UE 1 may send an SL signal by using the resource unit. For example, a resource pool in which UE 1 can send a signal may be configured to UE 2 as a receiving UE, and a signal of UE 1 may be detected in the resource pool.

[0112] Herein, if UE 1 is within the connection range of the BS, the BS may inform the resource pool to UE 1. Otherwise, if UE 1 is out of the connection range of the BS, another UE may inform UE 1 of the resource pool, or UE 1 may use a pre-configured resource pool.

[0113] Generally, a resource pool can be configured in units of multiple resources, and each UE can select one or more units of resources to use it in its SL signal transmission.

[0114] Hereinafter, resource allocation in SL will be described.

[0115] Fig.10 A process of performing V2X or SL communication by a UE based on a transmission mode according to an embodiment of the present disclosure is shown. Fig.10 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure. In various embodiments of the present disclosure, the transmission mode may be referred to as a mode or a resource allocation mode. Hereinafter, for ease of explanation, in LTE, the transmission mode may be referred to as an LTE transmission mode. In NR, the transmission mode may be referred to as an NR resource allocation mode.

[0116] For example, Fig.10 (a) in FIG. 1 shows UE operations related to LTE transmission mode 1 or LTE transmission mode 3. Alternatively, for example, Fig.10 (a) in FIG. 1 shows UE operations related to NR resource allocation mode 1. For example, LTE transmission mode 1 may be applied to conventional SL communication, and LTE transmission mode 3 may be applied to V2X communication.

[0117] For example, Fig.10 (b) in FIG. 4 shows UE operations related to LTE transmission mode 2 or LTE transmission mode 4. Alternatively, for example, Fig.10 (b) in FIG. 1 shows UE operation related to NR resource allocation mode 2.

[0118] Reference Fig.10 In (a), in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, the BS may schedule SL resources to be used by the UE for SL transmission. For example, the BS may perform resource scheduling for UE 1 through PDCCH (more specifically, downlink control information (DCI)), and UE 1 may perform V2X or SL communication for UE 2 according to the resource scheduling. For example, UE 1 may send sidelink control information (SCI) to UE 2 through a physical sidelink control channel (PSCCH), and thereafter send data based on the SCI to UE 2 through a physical sidelink shared channel (PSSCH).

[0119] Reference Fig.10 (b) in the figure, in LTE transmission mode 2, LTE transmission mode 4 or NR resource allocation mode 2, the UE can determine the SL transmission resources within the SL resources configured by the BS / network or the pre-configured SL resources. For example, the configured SL resources or the pre-configured SL resources can be a resource pool. For example, the UE can autonomously select or schedule resources for SL transmission. For example, the UE can perform SL communication by autonomously selecting resources in the configured resource pool. For example, the UE can autonomously select resources within a selection window by performing a sensing and resource (re)selection process. For example, sensing can be performed in units of subchannels. In addition, UE 1, which has autonomously selected resources in the resource pool, can send SCI to UE 2 via PSCCH, and thereafter data based on the SCI can be sent to UE 2 via PSSCH.

[0120] Fig.11 Three playback types according to embodiments of the present disclosure are shown. Fig.11 The embodiments of can be combined with various embodiments of the present disclosure. Specifically, Fig.11 (a) shows broadcast type SL communication, Fig.11 (b) in FIG. 4 shows unicast type SL communication, and Fig.11 (c) shows multicast SL communication. In the case of unicast SL communication, the UE can perform one-to-one communication with another UE. In the case of multicast SL transmission, the UE can perform SL communication with one or more UEs in the group to which the UE belongs. In various embodiments of the present disclosure, SL groupcast communication can be replaced by SL multicast communication, SL one-to-many communication, etc.

[0121] Hereinafter, side link (SL) congestion control will be described.

[0122] If the UE autonomously determines the SL transmission resources, the UE also autonomously determines the size and frequency of use of the resources for use by the UE. Of course, due to constraints from the network, etc., the use of resource sizes or usage frequencies greater than or equal to a certain level may be limited. However, if all UEs use a relatively large amount of resources in a situation where many UEs are concentrated in a specific area at a specific time, the overall performance may be significantly degraded due to mutual interference.

[0123] Therefore, the UE may need to observe the channel situation. If it is determined that an excessive amount of resources are consumed, it is preferred that the UE autonomously reduce the use of resources. In the present disclosure, this can be defined as congestion control (CR). For example, the UE can determine whether the energy measured in the unit time / frequency resource is greater than or equal to a specific level, and can adjust the amount and frequency of use of its transmission resources based on the ratio of the unit time / frequency resources in which the energy greater than or equal to the specific level is observed. In the present disclosure, the ratio of the time / frequency resources in which the energy greater than or equal to the specific level is observed can be defined as the channel busy ratio (CBR). The UE can measure the CBR of the channel / frequency. In addition, the UE can send the measured CBR to the network / BS.

[0124] Fig.12 The resource unit used for CBR measurement according to the embodiment of the present disclosure is shown. Fig.12 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0125] Reference Fig.12 As a result of the UE measuring RSSI based on the subchannel within a specific period (e.g., 100 ms), the CBR may indicate the number of subchannels in which the measurement result value of the received signal strength indicator (RSSI) has a value greater than or equal to a preconfigured threshold. Alternatively, the CBR may indicate the ratio of subchannels having a value greater than or equal to the preconfigured threshold among the subchannels within a specific duration. For example, Fig.12 In an embodiment of the present invention, if it is assumed that a shadowed subchannel is a subchannel having a value greater than or equal to a preconfigured threshold, the CBR may represent a ratio of shadowed subchannels within a 100 ms period. In addition, the CBR may be reported to the BS.

[0126] In addition, congestion control that takes into account the priority of the service (e.g., packet) may be necessary. To this end, for example, the UE may measure the channel occupancy ratio (CR). Specifically, the UE may measure the CBR, and the UE may determine the maximum value CRlimitk of the channel occupancy k (CRk) that may be occupied by the traffic corresponding to each priority (e.g., k) based on the CBR. For example, the UE may derive the maximum value CRlimitk of the channel occupancy related to the priority of each traffic based on a predetermined table of CBR measurements. For example, in the case of a service with a relatively high priority, the UE may derive a relatively large maximum value of the channel occupancy. Thereafter, the UE may perform congestion control by limiting the sum of the channel occupancies of the traffic whose priority k is lower than i to a value less than or equal to a specific value. Based on this method, the channel occupancy may be more strictly limited for services with relatively low priorities.

[0127] In addition to this, the UE can perform SL congestion control by using adjusting the transmit power level, discarding packets, determining whether to perform retransmission, adjusting the transmit RB size (MCS coordination), etc.

[0128] When a UE sends a signal, if the number of surrounding UEs is too large (or the measured amount of interference is too much), each individual UE changes the transmit power, the size of the frequency resources used, the size of the time resources used, the packet transmission periodicity, etc., thereby reducing the impact on the surrounding UEs. In doing so, the UE can determine different transmission parameters depending on the importance (or priority) of the packet being sent. Therefore, the operation of the UE identifying the surrounding situation and changing the transmission parameters will be referred to as congestion control. With regard to such congestion control, a UE allocated with several resource areas (e.g., resource pools) can perform separate congestion control in each pool.

[0129] For congestion control, the UE can measure the channel busy rate (CBR) for surrounding situation identification. CBR can be defined as the ratio of resources determined to be used by another UE to total resources. Based on whether the received power or RSSI measured on the corresponding resource exceeds a predetermined threshold, it can be determined whether each resource is used by the number of subchannels with RSSI exceeding a predetermined threshold in the total number of subchannels within a predetermined time interval. The channel occupancy rate (CR) evaluated at subframe n can be defined as follows. CR may mean the total number of subchannels used for its transmission in subframe [na, n-1] and permitted in subframe [n, n+b] divided by the total number of subchannels configured in the transmission pool on [na, n+b]. The channel busy rate (CBR) measured in subframe n can be defined as follows. For PSSCH, CBR may mean the subchannel portion in the resource pool whose S-RSSI measured by the UE exceeds the preconfigured threshold sensed on subframe [n-100, n-1]. For PSCCH, CBR may mean the portion of the resources of the PSCCH pool whose S-RSSI measured by the UE exceeds a preconfigured threshold sensed on subframe [n-100, n-1] in a preconfigured pool so that the PSCCH can be sent with its corresponding PSSCH in non-adjacent resource blocks, assuming that the PSCCH pool consists of resources of two consecutive PRB pairs in the frequency domain. CBR may be applied to RRC_IDLE intra-frequency, RRC_IDLE inter-frequency, RRC_CONNECTED intra-frequency, and RRC_CONNECTED inter-frequency. Here, the subframe index may be based on the physical subframe index.

[0130] The UE measures the CBR within the resource region and changes the CR (channel ratio or resource utilization, i.e., the ratio of resources used by each UE to the total resources), MCS, RB size (subchannel size, where subchannel means the size of the basic frequency resource where resource allocation occurs on the frequency band where UE-to-UE communication occurs), number of retransmissions, transmit power, resource reservation interval, etc. for each measured CBR. CR can be applied within the RRC_IDLE frequency, between RRC_IDLE frequencies, within the RRC_CONNECTED frequency, and between RRC_CONNECTED frequencies. Here, a can be a positive integer and b can be 0 or a positive integer. a and b can be determined by the UE implementation, where "a+b+1=1000", "a>=500", and "n+b should not exceed the last transmission opportunity of the current transmission grant". Here, CR can be evaluated for each (re)transmission. Here, in evaluating CR, the UE can assume that the transmission parameters used at subframe n in the absence of packet loss are reused according to the existing grant in subframe [n+1, n+b]. Here, the subframe index may be based on the physical subframe index. Here, the CR may be calculated by priority level.

[0131] Hereinafter, a hybrid automatic repeat request (HARQ) process will be described.

[0132] An error compensation scheme is used to ensure communication reliability. Examples of error compensation schemes may include a forward error correction (FEC) scheme and an automatic repeat request (ARQ) scheme. In the FEC scheme, errors in the receiving end can be corrected by appending an additional error correction code to the information bit. The FEC scheme has the advantages of small time delay and no additional information exchange between the transmitting end and the receiving end, but at the same time has the disadvantage of decreased system efficiency in a good channel environment. The ARQ scheme has the advantage of being able to improve transmission reliability, but at the same time has the disadvantage of time delay and decreased system efficiency in a bad channel environment.

[0133] A hybrid automatic repeat request (HARQ) scheme is a combination of an FEC scheme and an ARQ scheme. In the HARQ scheme, it is determined whether an unrecoverable error is included in data received by a physical layer, and retransmission is requested after the error is detected, thereby improving performance.

[0134] In the case of SL unicast and SL multicast, HARQ feedback and HARQ combining in the physical layer can be supported. For example, in the case where the receiving UE operates in resource allocation mode 1 or 2, the receiving UE can receive PSSCH from the transmitting UE, and the receiving UE can send HARQ feedback corresponding to PSSCH to the transmitting UE using the sidelink feedback control information (SFCI) format through the physical sidelink feedback channel (PSFCH).

[0135] For example, SL HARQ feedback may be enabled for unicast. In this case, in a non-code block group (non-CBG), the receiving UE may decode the PSCCH targeted to the receiving UE, and when the receiving UE successfully decodes the transport block associated with the PSCCH, the receiving UE may generate a HARQ-ACK. Thereafter, the receiving UE may send the HARQ-ACK to the transmitting UE. Conversely, after the receiving UE decodes the PSCCH targeted to the receiving UE, if the receiving UE fails to successfully decode the transport block associated with the PSCCH, the receiving UE may generate a HARQ-NACK, and the receiving UE may send the HARQ-NACK to the transmitting UE.

[0136] For example, SL HARQ feedback may be enabled for multicast.For example, during non-CBG, two different types of HARQ feedback options may be supported for multicast.

[0137] (1) Multicast Option 1: After decoding the PSCCH targeted at the receiving UE, if the receiving UE fails to decode the transport block associated with the PSCCH, the receiving UE may send a HARQ-NACK to the transmitting UE via the PSFCH. Conversely, when the receiving UE decodes the PSCCH targeted at the receiving UE and when the receiving UE successfully decodes the transport block associated with the PSCCH, the receiving UE does not send a HARQ-ACK to the transmitting UE.

[0138] (2) Multicast Option 2: After decoding the PSCCH targeted at the receiving UE, if the receiving UE fails to decode the transport block associated with the PSCCH, the receiving UE may send a HARQ-NACK to the transmitting UE via the PSFCH. Also, when the receiving UE decodes the PSCCH targeted at the receiving UE and when the receiving UE successfully decodes the transport block associated with the PSCCH, the receiving UE may send a HARQ-ACK to the transmitting UE via the PSFCH.

[0139] For example, if multicast option 1 is used in SL HARQ feedback, all UEs performing multicast communication can share PSFCH resources. For example, UEs belonging to the same group can send HARQ feedback by using the same PSFCH resources.

[0140] For example, if multicast option 2 is used in SL HARQ feedback, each UE performing multicast communication may use different PSFCH resources for HARQ feedback transmission. For example, UEs belonging to the same group may send HARQ feedback by using different PSFCH resources.

[0141] For example, when SL HARQ feedback is enabled for groupcast, the receiving UE may determine whether to send HARQ feedback to the transmitting UE based on transmit-receive (TX-RX) distance and / or reference signal received power (RSRP).

[0142] For example, in multicast option 1, in the case of HARQ feedback based on TX-RX distance, if the TX-RX distance is less than or equal to the communication range requirement, the receiving UE may send HARQ feedback in response to the PSSCH to the transmitting UE. Otherwise, if the TX-RX distance is greater than the communication range requirement, the receiving UE may not send HARQ feedback in response to the PSSCH to the transmitting UE. For example, the transmitting UE may inform the receiving UE of the location of the transmitting UE via the SCI associated with the PSSCH. For example, the SCI associated with the PSSCH may be a second SCI. For example, the receiving UE may estimate or obtain the TX-RX distance based on the location of the receiving UE and the location of the transmitting UE. For example, the receiving UE may decode the SCI associated with the PSSCH, and therefore may know the communication range requirement for the PSSCH.

[0143] For example, in the case of resource allocation mode 1, the time (offset) between PSFCH and PSSCH can be configured or pre-configured. In the case of unicast and multicast, if retransmission is required on the SL, it can be indicated to the BS by the UE within the coverage area using PUCCH. The sending UE can send an indication to the serving BS of the sending UE in the form of a scheduling request (SR) / buffer status report (BSR) instead of a HARQ ACK / NACK. In addition, even if the BS does not receive the indication, the BS can schedule SL retransmission resources for the UE. For example, in the case of resource allocation mode 2, the time (offset) between PSFCH and PSSCH can be configured or pre-configured.

[0144] For example, from the perspective of UE transmission in a carrier, TDM between PSCCH / PSSCH and PSFCH may be allowed for a PSFCH format for a SL in a time slot. For example, a sequence-based PSFCH format with a single symbol may be supported. Here, the single symbol may not be an automatic gain control (AGC) duration. For example, a sequence-based PSFCH format may be applied to unicast and multicast.

[0145] For example, in a time slot associated with a resource pool, the PSFCH resource may be periodically configured for N time slot durations, or may be preconfigured. For example, N may be configured as one or more values ​​greater than or equal to 1. For example, N may be 1, 2, or 4. For example, HARQ feedback for transmissions in a specific resource pool may be sent via PSFCH only on the specific resource pool.

[0146] For example, if a transmitting UE sends a PSSCH to a receiving UE across time slot #x to time slot #n, the receiving UE may send HARQ feedback in response to the PSSCH to the transmitting UE in time slot #(N+A). For example, time slot #(N+A) may include PSFCH resources. Herein, for example, A may be a minimum integer greater than or equal to K. For example, K may be the number of logical time slots. In this case, K may be the number of time slots in a resource pool. Alternatively, for example, K may be the number of physical time slots. In this case, K may be the number of time slots inside or outside the resource pool.

[0147] For example, if the receiving UE sends HARQ feedback on the PSFCH resource in response to a PSSCH sent by the transmitting UE to the receiving UE, the receiving UE may determine the frequency domain and / or code domain of the PSFCH resource based on an implicit mechanism in the configured resource pool. For example, the receiving UE may determine the frequency domain and / or code domain of the PSFCH resource based on at least one of a timeslot index associated with the PSCCH / PSSCH / PSFCH, a subchannel associated with the PSCCH / PSSCH, or an identifier for each receiving UE in a group for identifying HARQ feedback based on multicast option 2. Additionally / alternatively, for example, the receiving UE may determine the frequency domain and / or code domain of the PSFCH resource based on at least one of SL RSRP, SINR, L1 source ID, and / or location information.

[0148] For example, if HARQ feedback transmission via the UE's PSFCH overlaps with HARQ feedback reception via the PSFCH, the UE may select either HARQ feedback transmission via the PSFCH or HARQ feedback reception via the PSFCH based on a priority rule. For example, the priority rule may be based at least on a priority indication of the associated PSCCH / PSSCH.

[0149] For example, if HARQ feedback transmissions by UEs via PSFCH overlap for multiple UEs, the UEs may select a specific HARQ feedback transmission based on a priority rule. For example, the priority rule may be based on the lowest priority indication of the related PSCCH / PSSCH.

[0150] Meanwhile, in the present disclosure, for example, the term "configured / configured" or the term "defined / defined" may refer to (pre) configuration (through predefined signaling (e.g., SIB, MAC, RRC, etc.)) from a base station or a network (for each resource pool). For example, "A is configured" may mean "the base station / network sends information related to A to the UE".

[0151] Meanwhile, in the LTE side link communication environment, if multiple resources are used by multiple UEs within a specific time, in order to adjust the corresponding problem, congestion control for PSCCH or PSSCH can be applied based on the channel occupancy rate (CR) value or the channel busy rate (CBR) value. For example, the UE can perform congestion control on PSCCH or PSSCH based on the CR value or the CBR value. Meanwhile, in the NR side link communication environment, PSFCH is newly introduced. Here, in the case of congestion control for PSFCH, the UE can use congestion control information for PSCCH or PSSCH related to PSFCH.

[0152] In conventional NR V2X, only CBR measurement and congestion control related to PSCCH / PSSCH can be supported. Therefore, according to the change of the interference level on the (preconfigured) PSFCH resource domain, there may be limitations in adaptively ensuring the performance of PSFCH having performance requirements different from PSCCH / PSSCH. In addition, because there are also PSCCH / PSSCH that do not require SL HARQ feedback (via PSFCH) among the PSCCH / PSSCH transmitted on the (preconfigured) PSCCH / PSSCH resource domain, it may be difficult to consider the interference level (e.g., CBR measured in the PSCCH / PSSCH resource domain) (accurately) represents the interference level of the PSFCH resource domain.

[0153] Based on various embodiments of the present disclosure, a method for performing congestion control and a device supporting the method are proposed. The method proposed according to various embodiments of the present disclosure can be extended not only to congestion control for PSFCH, but also to congestion control for PSCCH / PSSCH.

[0154] Based on the embodiments of the present disclosure, unlike the congestion control for PSCCH / PSSCH, the congestion control for PSFCH can be limitedly configured / applied only to specific (preconfigured) transmission parameters. For example, congestion control based only on the maximum transmit power limit can be defined / allowed for PSFCH. In this case, for example, a UE that performs congestion control on PSFCH can determine the PSFCH transmit power based on a CR value or a CBR value related to PSFCH. On the other hand, for example, when a UE that performs congestion control on PSFCH determines parameters other than the PSFCH transmit power, the UE may not consider / use the CR value or CBR value related to PSFCH. Here, for the following reasons, congestion control for PSFCH can be restrictively configured / applied only to specific (preconfigured) transmission parameters.

[0155] For example, the UE may determine whether to send PSFCH based on an indication of PSCCH / PSSCH reception and / or enabling SL HARQ feedback included in the SCI. In this case, for example, if CR_LIMIT-based congestion control is (already) applied to PSCCH / PSSCH transmission, CR_LIMIT-based congestion control is implicitly applied to PSFCH transmissions associated with PSCCH / PSSCH transmissions. Due to the above reasons, unlike congestion control for PSCCH / PSSCH, congestion control for PSFCH can be limitedly configured / applied only to specific (preconfigured) transmission parameters.

[0156] Alternatively, congestion control for PSFCH may be configured / applied to (all) transmission parameters, for example, the same as congestion control for PSCCH / PSSCH.

[0157] For example, the UE may configure / determine the CBR measurement period based on the following proposed rules. For example, if congestion control based on specific preconfigured transmission parameters (e.g., maximum transmit power limit) is applied to PSFCH transmission, the CBR measurement period used by the UE may be defined according to the following rules. In the present disclosure, for the sake of convenience of description, it may be assumed that PSFCH transmission is performed on time slot #N, and it may be assumed that the priority of PSFCH may be the priority of the associated PSSCH (e.g., data).

[0158] Fig.13 or Fig.14 A method for a UE to determine a CBR measurement window based on an embodiment of the present disclosure is shown. Fig.13 or Fig.14 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0159] refer to Fig.13 or Fig.14 , the UE may use the CBR value measured in the period from slot #(N-OFFSET_1) to slot #(N-OFFSET_1-OFFSET_2) to perform congestion control related to PSFCH transmission on slot #N. For example, the UE may perform CBR measurement in the time interval between slot #(N-OFFSET_1) and slot #(N-OFFSET_1-OFFSET_2), and the UE may perform congestion control related to PSFCH transmission on slot #N based on the measured CBR value. Fig.13 or Fig.14In an embodiment, time slot #N may be a time slot including PSFCH resources (e.g., PSFCH symbols), and time slot #(NK) may be a time slot including PSSCH / PSCCH resources (e.g., PSSCH / PSCCH symbols) related to the PSFCH resources.

[0160] For example, the OFFSET_1 value may be interpreted as the (minimum) time required to process the CBR measurement value and / or the (minimum) time required to set the (PSFCH) transmit power. For example, the OFFSET_1 value may be fixed to 4 ms. For example, the OFFSET_1 value may be specified as a specific value for the UE by configuration or preconfiguration from the network / base station. For example, the OFFSET_1 value may be configured or preconfigured for the UE to be 4 ms or 4 time slots. For example, the OFFSET_2 value may be a parameter that determines the length of the time window for the CBR measurement. For example, the OFFSET_2 value may be configured or preconfigured for the UE to be 100 ms or 100 time slots.

[0161] For example, the OFFSET_1 value may be independently configured for the UE between PSFCH and PSCCH / PSSCH. For example, the OFFSET_2 value may be independently configured for the UE between PSFCH and PSCCH / PSSCH. For example, between PSFCH and PSCCH / PSSCH, CBR measurement and congestion control related parameters (e.g., the length of the CBR measurement window, physical layer parameter limits for each CBR / packet priority, etc.) may be configured differently or independently for the UE.

[0162] For example, the OFFSET_1 value may be configured differently or independently for the UE based on a parameter set (e.g., subcarrier spacing, CP). For example, the OFFSET_1 value may be configured differently or independently for the UE based on a frequency range. For example, the OFFSET_1 value may be configured differently or independently for the UE based on a service type. For example, the OFFSET_1 value may be configured differently or independently for the UE based on a service priority. For example, the OFFSET_1 value may be configured differently or independently for the UE based on a QoS requirement (e.g., reliability, latency). For example, the OFFSET_1 value may be configured differently or independently for the UE based on a playback type (e.g., unicast, multicast, broadcast). For example, the OFFSET_1 value may be configured differently or independently for the UE based on a service type (e.g., periodically generated packets or non-periodically generated packets).

[0163] For example, the OFFSET_2 value may be configured differently or independently for the UE based on a parameter set (e.g., subcarrier spacing, CP). For example, the OFFSET_2 value may be configured differently or independently for the UE based on a frequency range. For example, the OFFSET_2 value may be configured differently or independently for the UE based on a service type. For example, the OFFSET_2 value may be configured differently or independently for the UE based on a service priority. For example, the OFFSET_2 value may be configured differently or independently for the UE based on a QoS requirement (e.g., reliability, latency). For example, the OFFSET_2 value may be configured differently or independently for the UE based on a playback type (e.g., unicast, multicast, broadcast). For example, the OFFSET_2 value may be configured differently or independently for the UE based on a service type (e.g., a periodically generated packet or an aperiodically generated packet).

[0164] For example, the UE may repeatedly send PSFCH for specific SL HARQ feedback via multiple resources (e.g., multiple time slots or multiple symbols). In this case, for example, the UE may consider / determine the time when the first PSFCH transmission is performed as time slot #N. Alternatively, for example, the UE may consider / determine the time when the last PSFCH transmission is performed as time slot #N. Alternatively, for example, the UE may consider / determine the time when the PSFCH transmission in a preconfigured order is performed as time slot #N. Alternatively, for example, the UE may consider / determine each time when the PSFCH transmission is performed as time slot #N. In the above case, for example, the UE may use the interference value measured based on the PSFCH transmission time on time slot #N for the remaining repeated PSFCH transmission-related congestion control.

[0165] For example, the UE may repeatedly transmit the PSCCH / PSSCH for a specific TB through multiple resources (e.g., multiple time slots or multiple symbols). In this case, for example, the UE may consider / determine the time when the first PSCCH / PSSCH transmission is performed as time slot #N. Alternatively, for example, the UE may consider / determine the time when the last PSCCH / PSSCH transmission is performed as time slot #N. Alternatively, for example, the UE may consider / determine the time when the PSCCH / PSSCH transmission in a preconfigured order is performed as time slot #N. Alternatively, for example, the UE may consider / determine each time when the PSCCH / PSSCH transmission is performed as time slot #N.

[0166] Fig.15 A method for a UE to determine a CBR measurement window based on an embodiment of the present disclosure is shown. Fig.15 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0167] refer to Fig.15, assuming that the PSCCH / PSSCH reception time associated with the PSFCH transmission is time slot #(NK). In this case, the UE may use the CBR value measured in the period from time slot #(NK-OFFSET_1) to time slot #(NK-OFFSET_1-OFFSET_2) for congestion control associated with the PSFCH transmission on time slot #N. For example, the UE may perform CBR measurement in the time interval between time slot #(NK-OFFSET_1) and time slot #(NK-OFFSET_1-OFFSET_2), and the UE may perform congestion control associated with the PSFCH transmission on time slot #N based on the measured CBR value. Fig.15 In an embodiment, time slot #N may be a time slot including PSFCH resources (e.g., PSFCH symbols), and time slot #(NK) may be a time slot including PSSCH / PSCCH resources (e.g., PSSCH / PSCCH symbols) related to the PSFCH resources.

[0168] For example, the OFFSET_1 value may be interpreted as the (minimum) time required to process the CBR measurement value and / or the (minimum) time required to set the (PSFCH) transmit power. For example, the OFFSET_1 value may be fixed to 4 ms. For example, the OFFSET_1 value may be specified as a specific value for the UE by configuration or preconfiguration from the network / base station. For example, the OFFSET_1 value may be configured or preconfigured for the UE to be 4 ms or 4 time slots. For example, the OFFSET_2 value may be a parameter that determines the length of the time window for the CBR measurement. For example, the OFFSET_2 value may be configured or preconfigured for the UE to be 100 ms or 100 time slots.

[0169] For example, the OFFSET_1 value may be independently configured for the UE between PSFCH and PSCCH / PSSCH. For example, the OFFSET_2 value may be independently configured for the UE between PSFCH and PSCCH / PSSCH. For example, between PSFCH and PSCCH / PSSCH, CBR measurement and congestion control related parameters (e.g., the length of the CBR measurement window, physical layer parameter limits for each CBR / packet priority, etc.) may be configured differently or independently for the UE.

[0170] For example, the OFFSET_1 value may be configured differently or independently for the UE based on a parameter set (e.g., subcarrier spacing, CP). For example, the OFFSET_1 value may be configured differently or independently for the UE based on a frequency range. For example, the OFFSET_1 value may be configured differently or independently for the UE based on a service type. For example, the OFFSET_1 value may be configured differently or independently for the UE based on a service priority. For example, the OFFSET_1 value may be configured differently or independently for the UE based on a QoS requirement (e.g., reliability, latency). For example, the OFFSET_1 value may be configured differently or independently for the UE based on a playback type (e.g., unicast, multicast, broadcast). For example, the OFFSET_1 value may be configured differently or independently for the UE based on a service type (e.g., periodically generated packets or non-periodically generated packets).

[0171] For example, the OFFSET_2 value may be configured differently or independently for the UE based on a parameter set (e.g., subcarrier spacing, CP). For example, the OFFSET_2 value may be configured differently or independently for the UE based on a frequency range. For example, the OFFSET_2 value may be configured differently or independently for the UE based on a service type. For example, the OFFSET_2 value may be configured differently or independently for the UE based on a service priority. For example, the OFFSET_2 value may be configured differently or independently for the UE based on a QoS requirement (e.g., reliability, latency). For example, the OFFSET_2 value may be configured differently or independently for the UE based on a playback type (e.g., unicast, multicast, broadcast). For example, the OFFSET_2 value may be configured differently or independently for the UE based on a service type (e.g., a periodically generated packet or an aperiodically generated packet).

[0172] Fig.16 A method for a UE that has received multiple PSCCHs / PSSCHs to transmit a PSFCH according to an embodiment of the present disclosure is shown. Fig.16 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0173] exist Fig.16In an embodiment of the present invention, the PSFCH transmitted in time slot #N may be associated with time slot #A, time slot #B, and time slot #C. That is, in response to multiple PSCCH / PSSCH received in time slot #A, time slot #B, and time slot #C, the UE may perform PSFCH transmission in time slot #N. For example, the UE may receive PSCCH / PSSCH for a specific TB through multiple resources (e.g., multiple time slots or multiple symbols), and the UE may perform PSFCH transmission associated with the PSCCH / PSSCH. In this case, for example, the UE may consider / determine the time of the resource (e.g., time slot #C) in which the last PSCCH / PSSCH transmission is performed as time slot #(NK). Alternatively, for example, the UE may consider / determine the time of the resource (e.g., time slot #A) in which the first PSCCH / PSSCH transmission is performed as time slot #(NK). Alternatively, for example, the UE may consider / determine the time of the resource in which the PSCCH / PSSCH transmission in the preconfigured order is performed as time slot #(NK).

[0174] exist Fig.16 In the embodiment of , it is assumed that the UE fails to decode the PSCCH transmitted on time slot #A. On the other hand, it is assumed that the UE successfully decodes the PSCCH transmitted on time slot #B and time slot #C. In this case, for example, the UE may consider / determine the time of the last resource (e.g., time slot #C) in which the decoding of the PSCCH is actually successful as time slot #(NK). Alternatively, for example, the UE may consider / determine the time of the first resource (e.g., time slot #B) in which the decoding of the PSCCH is actually successful as time slot #(NK).

[0175] Based on an embodiment of the present disclosure, a UE may determine a CBR measurement window (e.g., a window for measuring interference) for congestion control associated with a PSFCH transmitted on a PSFCH time slot (i.e., time slot #N). Here, for example, the resource for which interference is measured within a CBR measurement window (hereinafter, CBR_RSC) may be limited to a PSFCH resource domain. In this case, for example, the UE may obtain a CBR value by measuring interference only in a PSFCH resource domain within the CBR measurement window. Alternatively, for example, CBR_RSC may be limited to a PSSCH / PSCCH resource domain. In this case, for example, the UE may obtain a CBR value by measuring interference only in a PSSCH / PSCCH resource domain within the CBR measurement window. Alternatively, for example, CBR_RSC may include both a PSSCH / PSCCH resource domain and a PSFCH resource domain. In this case, for example, the UE may obtain a CBR value by measuring interference in a PSSCH / PSCCH resource domain and a PSFCH resource domain within the CBR measurement window.

[0176] The methods / principles proposed according to (some of) the various embodiments of the present disclosure may be extended (e.g., with Fig.13 or Fig.14 Related embodiments), so that the UE determines / derives the CBR measurement period for congestion control of PSCCH / PSSCH.

[0177] Fig.17 A method for a UE to determine a CBR measurement window based on an embodiment of the present disclosure is shown. Fig.17 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0178] refer to Fig.17 , the UE may use the CBR value measured in the period from time slot #(M-OFFSET_1) to time slot #(M-OFFSET_1-OFFSET_2) for congestion control associated with PSCCH / PSSCH transmission on time slot #M. For example, the UE may perform CBR measurement in the time interval between time slot #(M-OFFSET_1) and time slot #(M-OFFSET_1-OFFSET_2), and the UE may perform congestion control associated with PSCCH / PSSCH transmission on time slot #M based on the measured CBR value. Fig.17 In an embodiment, time slot #M may be a time slot including PSSCH / PSCCH resources (eg, PSSCH / PSCCH symbols).

[0179] For example, the OFFSET_1 value may be interpreted as the (minimum) time required to process the CBR measurement value and / or the (minimum) time required to set the (PSCCH / PSSCH) transmit power. For example, the OFFSET_1 value may be fixed to 4 ms. For example, the OFFSET_1 value may be specified as a specific value for the UE by configuration or preconfiguration from the network / base station. For example, the OFFSET_1 value may be configured or preconfigured to 4 ms or 4 time slots for the UE. For example, the OFFSET_2 value may be a parameter that determines the length of the time window for CBR measurement. For example, the OFFSET_2 value may be configured or preconfigured to 100 ms or 100 time slots for the UE.

[0180] For example, the OFFSET_1 value may be configured differently or independently for the UE based on a parameter set (e.g., subcarrier spacing, CP). For example, the OFFSET_1 value may be configured differently or independently for the UE based on a frequency range. For example, the OFFSET_1 value may be configured differently or independently for the UE based on a service type. For example, the OFFSET_1 value may be configured differently or independently for the UE based on a service priority. For example, the OFFSET_1 value may be configured differently or independently for the UE based on a QoS requirement (e.g., reliability, latency). For example, the OFFSET_1 value may be configured differently or independently for the UE based on a playback type (e.g., unicast, multicast, broadcast). For example, the OFFSET_1 value may be configured differently or independently for the UE based on a service type (e.g., periodically generated packets or non-periodically generated packets).

[0181] For example, the OFFSET_2 value may be configured differently or independently for the UE based on a parameter set (e.g., subcarrier spacing, CP). For example, the OFFSET_2 value may be configured differently or independently for the UE based on a frequency range. For example, the OFFSET_2 value may be configured differently or independently for the UE based on a service type. For example, the OFFSET_2 value may be configured differently or independently for the UE based on a service priority. For example, the OFFSET_2 value may be configured differently or independently for the UE based on a QoS requirement (e.g., reliability, latency). For example, the OFFSET_2 value may be configured differently or independently for the UE based on a playback type (e.g., unicast, multicast, broadcast). For example, the OFFSET_2 value may be configured differently or independently for the UE based on a service type (e.g., a periodically generated packet or an aperiodically generated packet).

[0182] For example, the UE may repeatedly transmit the PSCCH / PSSCH for a specific TB through multiple resources (e.g., multiple time slots or multiple symbols). In this case, for example, the UE may consider / determine the time when the first PSCCH / PSSCH transmission is performed as time slot #M. Alternatively, for example, the UE may consider / determine the time when the last PSCCH / PSSCH transmission is performed as time slot #M. Alternatively, for example, the UE may consider / determine the time when the PSCCH / PSSCH transmission in a preconfigured order is performed as time slot #M. Alternatively, for example, the UE may consider / determine each time when a PSCCH / PSSCH transmission is performed as time slot #M.

[0183] Based on various embodiments of the present disclosure, according to the change of interference in the PSFCH resource domain, the UE can effectively perform congestion control related to the PSFCH, and accordingly, can effectively meet the relevant performance requirements.

[0184] Fig.18 A method for a first device to perform wireless communication based on an embodiment of the present disclosure is shown. Fig.18 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0185] refer to Fig.18 In step S1810, the first device may receive a physical sidelink control channel (PSCCH) from the second device. In step S1820, the first device may receive a physical sidelink shared channel (PSSCH) associated with the PSCCH from the second device. In step S1830, the first device may determine a physical sidelink feedback channel (PSFCH) resource associated with the PSSCH based on a time slot and a subchannel associated with the PSSCH. In step S1840, the first device may obtain a channel busy rate (CBR) value associated with a PSFCH transmission on the PSFCH resource. For example, the CBR value may be obtained based on a measurement in a time interval between (i) a first time slot before a first offset from a time slot in which a PSSCH associated with the PSFCH resource is received and (ii) a second time slot before a second offset from the first time slot.

[0186] For example, based on receiving multiple PSSCHs associated with PSFCH resources in multiple time slots, the time slot in which the PSSCH is received may be the last time slot among the multiple time slots. For example, based on receiving multiple PSSCHs associated with PSFCH resources in multiple time slots, the time slot in which the PSSCH is received may be the first time slot among the multiple time slots. For example, based on receiving multiple PSSCHs associated with PSFCH resources in multiple time slots, the time slot in which the PSSCH is received may be a time slot in a preconfigured order for the first device among the multiple time slots.

[0187] For example, based on (i) multiple PSCCHs associated with PSFCH resources are transmitted in multiple time slots, and (ii) at least one PSCCH in at least one time slot among the multiple time slots is successfully decoded by the first device, the time slot in which the PSSCH is received may be the last time slot among at least one time slot associated with at least one PSCCH. For example, based on (i) multiple PSCCHs associated with PSFCH resources are transmitted in multiple time slots, and (ii) at least one PSCCH in at least one time slot among the multiple time slots is successfully decoded by the first device, the time slot in which the PSSCH is received may be the first time slot among at least one time slot associated with at least one PSCCH.

[0188] For example, the first offset may be an offset related to the time required to process a CBR value, or an offset related to the time required for power setting for PSFCH transmission, and the second offset may be an offset for determining a time window length related to CBR measurement.

[0189] For example, a first offset or a second offset for obtaining a CBR value associated with a PSFCH transmission and an offset for obtaining a CBR value associated with a PSCCH transmission or a PSSCH transmission may be independently configured for the first device, respectively. For example, the first offset or the second offset may be configured differently based on at least one of a parameter set, a frequency range, a service type, a service priority, a quality of service (QoS) requirement, a playback type, or a business type.

[0190] For example, the CBR value may be obtained based on the measurement of the PSFCH resource domain only in the time interval between the first time slot and the second time slot. For example, the CBR value may be obtained based on the measurement of only the PSCCH resource domain and the PSSCH resource domain in the time interval between the first time slot and the second time slot. For example, the CBR value may be obtained based on the measurement of the PSCCH resource domain, the PSSCH resource domain, and the PSFCH resource domain in the time interval between the first time slot and the second time slot.

[0191] In addition, for example, the first device may determine parameters related to PSFCH transmission based on the CBR value.

[0192] Additionally, for example, the first device may determine a power associated with the PSFCH transmission based on the CBR value. Additionally, for example, the first device may perform PSFCH transmission on the PSFCH resource based on the power associated with the PSFCH transmission.

[0193] The proposed method can be applied to the devices described in various embodiments of the present disclosure. First, the processor 102 of the first device 100 can control the transceiver 106 to receive a physical side link control channel (PSCCH) from the second device. In addition, the processor 102 of the first device 100 can control the transceiver 106 to receive a physical side link shared channel (PSSCH) associated with the PSCCH from the second device. In addition, the processor 102 of the first device 100 can determine the physical side link feedback channel (PSFCH) resource associated with the PSSCH based on the time slot and subchannel associated with the PSSCH. In addition, the processor 102 of the first device 100 can obtain a channel busy rate (CBR) value associated with the PSFCH transmission on the PSFCH resource. For example, the CBR value can be obtained based on a measurement in the time interval between (i) a first time slot before the first offset of the time slot in which the PSSCH associated with the PSFCH resource is received and (ii) a second time slot before the second offset of the first time slot.

[0194] Based on an embodiment of the present disclosure, a first device configured to perform wireless communication may be provided. For example, the first device may include: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute instructions to: receive a physical sidelink control channel (PSCCH) from a second device; receive a physical sidelink shared channel (PSSCH) associated with the PSCCH from a second device; determine a physical sidelink feedback channel (PSFCH) resource associated with the PSSCH based on a time slot and a subchannel associated with the PSSCH; and obtain a channel busy rate (CBR) value associated with a PSFCH transmission on a PSFCH resource. For example, the CBR value may be obtained based on a measurement in a time interval between (i) a first time slot before a first offset from a time slot in which a PSSCH associated with a PSFCH resource is received and (ii) a second time slot before a second offset from the first time slot.

[0195] Based on an embodiment of the present disclosure, a device configured to control a first user equipment (UE) performing wireless communication may be provided. For example, the device may include: one or more processors; and one or more memories, which are operably connected to the one or more processors and store instructions. For example, the one or more processors may execute instructions to: receive a physical sidelink control channel (PSCCH) from a second UE; receive a physical sidelink shared channel (PSSCH) related to the PSCCH from a second UE; determine a physical sidelink feedback channel (PSFCH) resource related to the PSSCH based on a time slot and a subchannel related to the PSSCH; and obtain a channel busy rate (CBR) value related to the PSFCH transmission on the PSFCH resource. For example, the CBR value may be obtained based on a measurement in the time interval between (i) a first time slot before a first offset from a time slot in which a PSSCH related to a PSFCH resource is received and (ii) a second time slot before a second offset from the first time slot.

[0196] Based on an embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. For example, when the instructions are executed, a first device may: receive a physical sidelink control channel (PSCCH) from a second device; receive a physical sidelink shared channel (PSSCH) associated with the PSCCH from a second device; determine a physical sidelink feedback channel (PSFCH) resource associated with the PSSCH based on a timeslot sub-channel associated with the PSSCH; and obtain a channel busy rate (CBR) value associated with a PSFCH transmission on the PSFCH resource. For example, the CBR value may be obtained based on a measurement in the time interval between (i) a first time slot before a first offset from a timeslot in which a PSSCH associated with a PSFCH resource is received and (ii) a second time slot before a second offset from the first time slot.

[0197] Various embodiments of the present disclosure may be combined with each other.

[0198] Hereinafter, devices to which various embodiments of the present disclosure can be applied will be described.

[0199] The various descriptions, functions, processes, proposals, methods and / or operational flows of the present disclosure described in this document may be applied to, but not limited to, various fields requiring wireless communication / connection between devices (e.g., 5G).

[0200] Hereinafter, a description will be given in more detail with reference to the accompanying drawings. In the following drawings / descriptions, unless otherwise described, the same reference numerals may represent the same or corresponding hardware blocks, software blocks or functional blocks.

[0201] Fig.19 A communication system (1) according to an embodiment of the present disclosure is shown.

[0202] Reference Fig.19, a communication system (1) to which various embodiments of the present disclosure are applied includes a wireless device, a base station (BS), and a network. Herein, a wireless device refers to a device that performs communication using a radio access technology (RAT) (e.g., 5G new RAT (NR) or long term evolution (LTE)), and may be referred to as a communication / radio / 5G device. The wireless device may include, but is not limited to, a robot (100a), a vehicle (100b-1, 100b-2), an extended reality (XR) device (100c), a handheld device (100d), a home appliance (100e), an Internet of Things (IoT) device (100f), and an artificial intelligence (AI) device / server (400). For example, a vehicle may include a vehicle with a wireless communication function, an autonomous vehicle, and a vehicle capable of performing inter-vehicle communication. Herein, a vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). XR devices may include augmented reality (AR) / virtual reality (VR) / mixed reality (MR) devices and may be implemented in the form of head mounted devices (HMD), head up displays (HUD) installed in vehicles, televisions, smart phones, computers, wearable devices, home appliance devices, digital signage, vehicles, robots, etc. Handheld devices may include smart phones, smart boards, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebooks). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, a BS and a network may be implemented as wireless devices, and a specific wireless device (200a) may operate as a BS / network node relative to other wireless devices.

[0203] Here, in addition to LTE, NR and 6G, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may also include a narrowband Internet of Things for low-power communication. In this case, for example, the NB-IoT technology may be an example of a low-power wide area network (LPWAN) technology, and may be implemented as a standard such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the above names. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may perform communication based on the LTE-M technology. In this case, as an example, the LTE-M technology may be an example of an LPWAN, and may be referred to as various names including enhanced machine type communication (eMTC), etc. For example, the LTE-M technology may be implemented as at least any one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE machine type communication and / or 7) LTE M, and is not limited to the above names. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may include at least one of Bluetooth, a low power wide area network (LPWAN), and ZigBee considering low power communication, and is not limited to the above names. As an example, the ZigBee technology can generate a personal area network (PAN) related to small / low power digital communication based on various standards including IEEE 802.15.4, etc., and can be called various names.

[0204] The wireless devices 100a to 100f may be connected to the network 300 via the BS 200. AI technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI ​​server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other via the BS 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., side link communication) with each other without passing through the BS / network. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). An IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0205] Wireless communication / connection 150a, 150b or 150c can be established between wireless devices 100a to 100f / BS 200 or BS200 / BS 200. Here, the wireless communication / connection can be established through various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication) or inter-BS communication (e.g., relay, integrated access backhaul (IAB)). The wireless device and the BS / wireless device can send / receive radio signals to / from each other through wireless communication / connections 150a and 150b. For example, wireless communication / connections 150a and 150b can send / receive signals through various physical channels. To this end, various configuration information configuration processes for sending / receiving radio signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation and resource mapping / demapping), and at least a portion of the resource allocation process can be performed based on various proposals of the present disclosure.

[0206] Fig. 20 A wireless device according to an embodiment of the present disclosure is shown.

[0207] Reference Fig. 20 , the first wireless device (100) and the second wireless device (200) may transmit radio signals via various RATs (e.g., LTE and NR). Herein, {the first wireless device (100) and the second wireless device (200)} may correspond to Fig.19 {wireless device (100x) and BS (200)} and / or {wireless device (100x) and wireless device (100x)}.

[0208] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may additionally further include one or more transceivers 106 and / or one or more antennas 108. The (one or more) processors 102 may control the (one or more) memories 104 and / or the (one or more) transceivers 106, and may be configured to implement the descriptions, functions, processes, proposals, methods and / or operation flows disclosed in this document. For example, the (one or more) processors 102 may process the information in the (one or more) memories 104 to generate first information / signals, and then send a radio signal including the first information / signals through the (one or more) transceivers 106. The (one or more) processors 102 may receive a radio signal including a second information / signal through the transceiver 106, and then store the information obtained by processing the second information / signals in the (one or more) memories 104. The (one or more) memories 104 may be connected to the (one or more) processors 102, and may store various information related to the operation of the (one or more) processors 102. For example, (one or more) memories 104 may store software code including commands for executing part or all of the processing controlled by (one or more) processors 102 or for executing the descriptions, functions, processes, proposals, methods and / or operational flows disclosed in this document. Here, (one or more) processors 102 and (one or more) memories 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). (One or more) transceivers 106 may be connected to (one or more) processors 102 and send and / or receive radio signals through (one or more) antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. (One or more) transceivers 106 may be used interchangeably with (one or more) radio frequency (RF) units. In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0209] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and may additionally further include one or more transceivers 206 and / or one or more antennas 208. The (one or more) processors 202 may control the (one or more) memories 204 and / or the (one or more) transceivers 206, and may be configured to implement the descriptions, functions, processes, proposals, methods and / or operation flows disclosed in this document. For example, the (one or more) processors 202 may process the information in the (one or more) memories 204 to generate third information / signals, and then transmit a radio signal including the third information / signals through the (one or more) transceivers 206. The (one or more) processors 202 may receive a radio signal including a fourth information / signal through the (one or more) transceivers 106, and then store the information obtained by processing the fourth information / signals in the (one or more) memories 204. The (one or more) memories 204 may be connected to the (one or more) processors 202, and may store various information related to the operation of the (one or more) processors 202. For example, (one or more) memories 204 may store software code including commands for executing part or all of the processing controlled by (one or more) processors 202 or for executing the descriptions, functions, processes, proposals, methods and / or operational flows disclosed in this document. Here, (one or more) processors 202 and (one or more) memories 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). (One or more) transceivers 206 may be connected to (one or more) processors 202 and transmit and / or receive radio signals through (one or more) antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. (One or more) transceivers 206 may be used interchangeably with (one or more) RF units. In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0210] Below, the hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by, but are not limited to, one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). One or more processors 102 and 202 may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the description, function, process, proposal, method, and / or operation flow disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data, or information according to the description, function, process, proposal, method, and / or operation flow disclosed in this document. One or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the description, function, process, proposal, method, and / or operation flow disclosed in this document, and provide the generated signals to one or more transceivers 106 and 206. One or more processors 102 and 202 can receive signals (e.g., baseband signals) from one or more transceivers 106 and 206 and obtain PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operating procedures disclosed in this document.

[0211] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) may be included in one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document may be implemented using firmware or software, and the firmware or software may be configured to include modules, processes, or functions. Firmware or software configured to execute the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document may be included in one or more processors 102 and 202 or stored in one or more memories 104 and 204, thereby being driven by one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document may be implemented using software or firmware in the form of code, commands, and / or command sets.

[0212] One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and may store various types of data, signals, messages, information, programs, codes, instructions, and / or commands. One or more memories 104 and 204 may be composed of read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard drive, registers, cash memory, computer-readable storage media, and / or combinations thereof. One or more memories 104 and 204 may be located inside and / or outside one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 via various technologies such as wired or wireless connections.

[0213] One or more transceivers 106 and 206 may send user data, control information, and / or radio signals / channels mentioned in the method and / or operation flow of this document to one or more other devices. One or more transceivers 106 and 206 may receive user data, control information, and / or radio signals / channels mentioned in the description, function, process, proposal, method, and / or operation flow disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202, and may send and receive radio signals. For example, one or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may send user data, control information, or radio signals to one or more other devices. One or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to send and receive user data, control information and / or radio signals / channels mentioned in the description, functions, processes, proposals, methods and / or operation flows disclosed in this document through one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert received radio signals / channels, etc. from RF band signals to baseband signals to process received user data, control information, radio signals / channels, etc. using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert user data, control information, radio signals / channels, etc. processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0214] Fig.21 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown.

[0215] Reference Fig.21 The signal processing circuit (1000) may include a scrambler (1010), a modulator (1020), a layer mapper (1030), a precoder (1040), a resource mapper (1050), and a signal generator (1060). Fig.21 Operation / function, not limited to Fig. 20 The processor (102, 202) and / or transceiver (106, 206) of Fig. 20The processor (102, 202) and / or the transceiver (106, 206) are implemented Fig.21 For example, you can Fig. 20 The processor (102, 202) implements blocks 1010 to 1060. Alternatively, Fig. 20 The processor (102, 202) implements blocks 1010 to 1050 and can be implemented by Fig. 20 The transceiver (106, 206) is used to implement box 1060.

[0216] Can be through Fig.21 The signal processing circuit (1000) converts the codeword into a radio signal. Herein, the codeword is a coded bit sequence of an information block. The information block may include a transport block (e.g., UL-SCH transport block, DL-SCH transport block). The radio signal may be transmitted through various physical channels (e.g., PUSCH and PDSCH).

[0217] Specifically, the codeword can be converted into a scrambled bit sequence by the scrambler 1010. The scrambling sequence for scrambling can be generated based on an initial value, and the initial value can include the ID information of the wireless device. The scrambled bit sequence can be modulated into a modulation symbol sequence by the modulator 1020. The modulation scheme may include pi / 2-binary phase shift keying (pi / 2-BPSK), m-phase shift keying (m-PSK) and m-quadrature amplitude modulation (m-QAM). The complex modulation symbol sequence can be mapped to one or more transmission layers by the layer mapper 1030. The modulation symbol of each transmission layer can be mapped (precoded) to (one or more) corresponding antenna ports by the precoder 1040. The output z of the precoder 1040 can be obtained by multiplying the output y of the layer mapper 1030 with the N*M precoding matrix W. Here, N is the number of antenna ports and M is the number of transmission layers. The precoder 1040 can perform precoding after performing transform precoding (e.g., DFT) for the complex modulation symbol. Alternatively, the precoder 1040 may perform precoding without performing transform precoding.

[0218] The resource mapper 1050 may map the modulation symbols of each antenna port to time-frequency resources. The time-frequency resources may include multiple symbols in the time domain (e.g., CP-OFDMA symbols and DFT-s-OFDMA symbols) and multiple subcarriers in the frequency domain. The signal generator 1060 may generate a radio signal from the mapped modulation symbols, and the generated radio signal may be sent to other devices through each antenna. To this end, the signal generator 1060 may include an inverse fast Fourier transform (IFFT) module, a cyclic prefix (CP) inserter, a digital-to-analog converter (DAC), and an up-converter.

[0219] Can Fig.21 The signal processing process for the signal received in the wireless device is configured in a manner opposite to the signal processing process (1010-1060) of the wireless device. Fig. 20 100, 200) can receive a radio signal from the outside through an antenna port / transceiver. The received radio signal can be converted into a baseband signal by a signal restorer. To this end, the signal restorer may include a frequency downlink converter, an analog-to-digital converter (ADC), a CP remover, and a fast Fourier transform (FFT) module. Next, the baseband signal can be restored to a codeword through a resource demapping process, a post-coding process, a demodulation processor, and a descrambling process. The codeword can be restored to the original information block by decoding. Therefore, a signal processing circuit (not illustrated) for receiving a signal may include a signal restorer, a resource demapper, a post-encoder, a demodulator, a descrambler, and a decoder.

[0220] Fig. 22 Another example of a wireless device according to an embodiment of the present disclosure is shown. The wireless device can be implemented in various forms according to use cases / services (see Fig.19 ).

[0221] Reference Fig. 22 , the wireless device (100, 200) may correspond to Fig. 20 The wireless devices (100, 200) may be configured by various elements, components, units / portions and / or modules. For example, each of the wireless devices (100, 200) may include a communication unit (110), a control unit (120), a memory unit (130) and additional components (140). The communication unit may include a communication circuit (112) and (one or more) transceivers (114). For example, the communication circuit (112) may include Fig. 20 One or more processors (102, 202) and / or one or more memories (104, 204) of the present invention. For example, the transceiver(s) (114) may include Fig. 20The control unit (120) is electrically connected to the communication unit (110), the memory (130) and the additional components (140), and controls the overall operation of the wireless device. For example, the control unit (120) can control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit (130). The control unit (120) can send the information stored in the memory unit (130) to the outside (e.g., other communication devices) via the communication unit (110) through a wireless / wired interface, or store the information received from the outside (e.g., other communication devices) via the communication unit (110) through a wireless / wired interface in the memory unit (130).

[0222] The additional component (140) may be configured in various ways depending on the type of the wireless device. For example, the additional component (140) may include at least one of a power unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device may be implemented in the following forms without limitation: a robot ( Fig.19 100a), vehicles ( Fig.19 100b-1 and 100b-2), XR devices ( Fig.19 100c), handheld device ( Fig.19 100d), household appliances ( Fig.19 100e), IoT devices ( Fig.19 100f), digital broadcast terminal, hologram device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate / environmental device, AI server / device ( Fig.19 400), BS( Fig.19 200), network nodes, etc. Depending on the use case / service, the wireless device can be used in a mobile or fixed place.

[0223] exist Fig. 22In the wireless device (100, 200), all the various elements, components, units / parts and / or modules in the wireless device (100, 200) can be connected to each other through a wired interface, or at least part of them can be connected wirelessly through the communication unit (110). For example, in each of the wireless devices (100, 200), the control unit (120) and the communication unit (110) can be connected by wire, and the control unit (120) and the first unit (e.g., 130, 140) can be connected wirelessly through the communication unit (110). Each element, component, unit / part and / or module in the wireless device (100, 200) can also include one or more elements. For example, the control unit (120) can be constructed by a collection of one or more processors. As an example, the control unit (120) can be constructed by a collection of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit and a memory control processor. As another example, the memory ( 130 ) may be constructed by random access memory (RAM), dynamic RAM (DRAM), read only memory (ROM), flash memory, volatile memory, nonvolatile memory, and / or combinations thereof.

[0224] Hereinafter, the implementation will be described in detail with reference to the accompanying drawings. Fig. 22 .

[0225] Fig.23 A handheld device according to an embodiment of the present disclosure is shown. The handheld device may include a smart phone, a smart pad, a wearable device (e.g., a smart watch or smart glasses), or a portable computer (e.g., a notebook). The handheld device may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT).

[0226] Reference Fig.23 The handheld device (100) may include an antenna unit (108), a communication unit (110), a control unit (120), a memory unit (130), a power supply unit (140a), an interface unit (140b) and an I / O unit (140c). The antenna unit (108) may be configured as a part of the communication unit (110). Blocks 110 to 130 / 140a to 140c correspond to Fig. 22 Frame 110 to 130 / 140.

[0227] The communication unit 110 may send and receive signals (e.g., data signals and control signals) to and from other wireless devices or BSs. The control unit 120 may perform various operations by controlling the constituent elements of the handheld device 100. The control unit 120 may include an application processor (AP). The memory unit 130 may store data / parameters / programs / codes / commands required to drive the handheld device 100. The memory unit 130 may store input / output data / information. The power supply unit 140a may supply power to the handheld device 100 and include a wired / wireless charging circuit, a battery, etc. The interface unit 140b may support the connection of the handheld device 100 to other external devices. The interface unit 140b may include various ports (e.g., audio I / O ports and video I / O ports) for connecting to external devices. The I / O unit 140c may input or output video information / signals, audio information / signals, data and / or information input by a user. The I / O unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker and / or a tactile module.

[0228] For example, in the case of data communication, the I / O unit 140c can obtain information / signals (e.g., touch, text, voice, image, or video) input by the user, and the obtained information / signals can be stored in the memory unit 130. The communication unit 110 can convert the information / signals stored in the memory into radio signals, and directly send the converted radio signals to other wireless devices or to the BS. The communication unit 110 can receive radio signals from other wireless devices or BSs, and then restore the received radio signals to the original information / signals. The restored information / signals can be stored in the memory unit 130, and can be output as various types (e.g., text, voice, image, video, or tactile) through the I / O unit 140.

[0229] Fig.24 A vehicle or autonomous vehicle according to an embodiment of the present disclosure is shown. The vehicle or autonomous vehicle may be implemented by a mobile robot, a car, a train, a manned / unmanned aerial vehicle (AV), a ship, etc.

[0230] Reference Fig.24 The vehicle or autonomous vehicle (100) may include an antenna unit (108), a communication unit (110), a control unit (120), a drive unit (140a), a power supply unit (140b), a sensor unit (140c) and an autonomous driving unit (140d). The antenna unit (108) may be configured as a part of the communication unit (110). Blocks 110 / 130 / 140a to 140d correspond to Fig. 22 Frame 110 / 130 / 140.

[0231] The communication unit 110 may send and receive signals (e.g., data signals and control signals) to and from external devices such as other vehicles, BSs (e.g., gNBs and roadside units), and servers. The control unit 120 may perform various operations by controlling elements of the vehicle or autonomous vehicle 100. The control unit 120 may include an electronic control unit (ECU). The drive unit 140a may cause the vehicle or autonomous vehicle 100 to travel on the road. The drive unit 140a may include an engine, a motor, a transmission system, wheels, brakes, a steering device, etc. The power supply unit 140b may supply power to the vehicle or autonomous vehicle 100, and may include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c may acquire vehicle status, external environment information, user information, etc. The sensor unit 140c may include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor, a heading sensor, a position module, a vehicle forward / reverse sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, a lighting sensor, a pedal position sensor, etc. The autonomous driving unit 140d may implement a technology for maintaining a lane in which the vehicle is traveling, a technology for automatically adjusting a speed (e.g., adaptive cruise control), a technology for autonomously driving along a determined path, a technology for driving by automatically setting a path when a destination is set, and the like.

[0232] For example, the communication unit 110 may receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d may generate an autonomous driving path and a driving plan from the acquired data. The control unit 120 may control the drive unit 140a so that the vehicle or the autonomous driving vehicle 100 may move along the autonomous driving path according to the driving plan (e.g., speed / direction control). In the middle of autonomous driving, the communication unit 110 may aperiodically / periodically acquire the most recent traffic information data from an external server and acquire surrounding traffic information data from adjacent vehicles. In the middle of autonomous driving, the sensor unit 140c may acquire vehicle status and / or surrounding environment information. The autonomous driving unit 140d may update the autonomous driving path and driving plan based on the newly acquired data / information. The communication unit 110 may transmit information about the vehicle position, autonomous driving path, and / or driving plan to an external server. The external server may predict traffic information data using AI technology, etc. based on information collected from the vehicle or autonomous driving vehicle, and provide the predicted traffic information data to the vehicle or autonomous driving vehicle.

[0233] The claims in this specification can be combined in various ways. For example, the technical features in the method claims of this specification can be combined to be implemented or performed in a device, and the technical features in the device claims can be combined to be implemented or performed in a method. In addition, the technical features in (one or more) method claims and (one or more) device claims can be combined to be implemented or performed in a device. In addition, the technical features in (one or more) method claims and (one or more) device claims can be combined to be implemented or performed in a method.

Claims

1. A method for performing wireless communication by a first device, the method comprising: receiving a physical sidelink control channel (PSCCH) from a second device; receiving, from the second device, a physical sidelink shared channel (PSSCH) associated with the PSCCH; determining a physical sidelink feedback channel (PSFCH) resource associated with the PSSCH based on a timeslot and a subchannel associated with the PSSCH; and obtaining a channel busy rate (CBR) value associated with a PSFCH transmission on the PSFCH resource, wherein the CBR value is obtained based on measurements for a PSCCH resource region, a PSSCH resource region, and a PSFCH resource region in a time interval between (i) a first time slot before a first offset from a time slot in which the PSSCH associated with the PSFCH resource is received and (ii) a second time slot before a second offset from the first time slot, wherein the first offset is an offset related to a time required for processing the CBR value or an offset related to a time required for power setting for the PSFCH transmission, and The second offset is an offset used to determine the length of a time window related to CBR measurement.

2. The method according to claim 1, wherein: Based on receiving a plurality of PSSCHs associated with the PSFCH resource in a plurality of time slots, the time slot in which the PSSCH is received is a last time slot among the plurality of time slots.

3. The method according to claim 1, wherein: Based on receiving a plurality of PSSCHs associated with the PSFCH resource in a plurality of time slots, the time slot in which the PSSCH is received is a first time slot among the plurality of time slots.

4. The method according to claim 1, wherein: Based on receiving a plurality of PSSCHs associated with the PSFCH resource in a plurality of time slots, the time slot in which the PSSCH is received is a time slot in a preconfigured order for the first device among the plurality of time slots.

5. The method according to claim 1, wherein: Based on (i) sending multiple PSCCHs associated with the PSFCH resources in multiple time slots, and (ii) successfully decoding at least one PSCCH in at least one time slot among the multiple time slots by the first device, the time slot in which the PSSCH is received is the last time slot among the at least one time slot associated with the at least one PSCCH.

6. The method according to claim 1, wherein: Based on (i) sending multiple PSCCHs associated with the PSFCH resources in multiple time slots and (ii) successfully decoding at least one PSCCH in at least one time slot among the multiple time slots by the first device, the time slot in which the PSSCH is received is the first time slot among the at least one time slot associated with the at least one PSCCH.

7. The method according to claim 1, wherein: The first offset or the second offset for obtaining the CBR value associated with the PSFCH transmission and the offset for obtaining the CBR value associated with the PSCCH transmission or the PSSCH transmission are independently configured for the first device, respectively.

8. The method according to claim 1, wherein: The first offset or the second offset is configured differently based on at least one of a parameter set, a frequency range, a service type, a service priority, a quality of service (QoS) requirement, a playout type, or a traffic type.

9. The method according to claim 1, further comprising: Parameters related to the PSFCH transmission are determined based on the CBR value.

10. The method according to claim 1, further comprising: determining a power associated with the PSFCH transmission based on the CBR value; as well as The PSFCH transmission on the PSFCH resources is performed based on the power associated with the PSFCH transmission.

11. A first device configured to perform wireless communication, the first device comprising: one or more memories storing instructions; one or more transceivers; as well as one or more processors connected to the one or more memories and the one or more transceivers, wherein the one or more processors execute the instructions to: receiving a physical sidelink control channel (PSCCH) from a second device; receiving, from the second device, a physical sidelink shared channel (PSSCH) associated with the PSCCH; determining a physical sidelink feedback channel (PSFCH) resource associated with the PSSCH based on a timeslot and a subchannel associated with the PSSCH; and obtaining a channel busy rate (CBR) value associated with a PSFCH transmission on the PSFCH resource, wherein the CBR value is obtained based on measurements for a PSCCH resource region, a PSSCH resource region, and a PSFCH resource region in a time interval between (i) a first time slot before a first offset from a time slot in which the PSSCH associated with the PSFCH resource is received and (ii) a second time slot before a second offset from the first time slot, wherein the first offset is an offset related to a time required for processing the CBR value or an offset related to a time required for power setting for the PSFCH transmission, and The second offset is an offset used to determine the length of a time window related to CBR measurement.

12. An apparatus configured to control a first user equipment (UE) performing wireless communication, the apparatus comprising: one or more processors; as well as one or more memories operably connected to the one or more processors and storing instructions, wherein the one or more processors execute the instructions to: receiving a physical sidelink control channel (PSCCH) from a second UE; receiving a physical sidelink shared channel (PSSCH) associated with the PSCCH from the second UE; determining a physical sidelink feedback channel (PSFCH) resource associated with the PSSCH based on a timeslot and a subchannel associated with the PSSCH; and obtaining a channel busy rate (CBR) value associated with a PSFCH transmission on the PSFCH resource, wherein the CBR value is obtained based on measurements for a PSCCH resource region, a PSSCH resource region, and a PSFCH resource region in a time interval between (i) a first time slot before a first offset from a time slot in which the PSSCH associated with the PSFCH resource is received and (ii) a second time slot before a second offset from the first time slot, wherein the first offset is an offset related to a time required for processing the CBR value or an offset related to a time required for power setting for the PSFCH transmission, and The second offset is an offset used to determine the length of a time window related to CBR measurement.

13. A non-transitory computer-readable storage medium storing instructions that, when executed, cause a first device to: receiving a physical sidelink control channel (PSCCH) from a second device; receiving, from the second device, a physical sidelink shared channel (PSSCH) associated with the PSCCH; determining a physical sidelink feedback channel (PSFCH) resource associated with the PSSCH based on a timeslot and a subchannel associated with the PSSCH; and obtaining a channel busy rate (CBR) value associated with a PSFCH transmission on the PSFCH resource, in, the CBR value is obtained based on measurements for a PSCCH resource region, a PSSCH resource region, and a PSFCH resource region in a time interval between (i) a first time slot before a first offset from a time slot in which the PSSCH associated with the PSFCH resource is received and (ii) a second time slot before a second offset from the first time slot, wherein the first offset is an offset related to a time required for processing the CBR value or an offset related to a time required for power setting for the PSFCH transmission, and The second offset is an offset used to determine the length of a time window related to CBR measurement.

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