Method and apparatus for determining a sidelink physical layer session identifier in a wireless communication system

Abstract

The present application provides a method for transmitting feedback information by a terminal in an NR V2X system. The method for transmitting feedback information may include: a first terminal performing a session establishment procedure with a second terminal based on at least one of unicast and multicast; a step of exchanging ID information between the first terminal and the second terminal during the session establishment process; and a step of completing the session establishment by the first terminal and the second terminal. When the first terminal and the second terminal complete the session establishment, a physical layer ID representing the session may be determined.

Description

Technical Field

[0001] The present disclosure relates to a method and apparatus for determining a sidelink physical layer session identification (ID) in a wireless communication system, and more particularly, to a method and apparatus for determining a sidelink layer-1 ID for vehicle-to-everything (V2X) communication in a wireless communication system.

[0002] Related fields

[0003] The International Telecommunication Union (ITU) has developed the International Mobile Telecommunications (IMT) framework and standards. Similarly, discussions on fifth-generation (5G) communications are ongoing through a project called "IMT for 2020 and beyond."

[0004] To meet the requirements of "IMT for 2020 and beyond", discussions are underway to support various parameters (numerology) regarding the time-frequency resource unit standard by considering various scenarios, service requirements, and potential system compatibility in the 3rd Generation Partnership Project (3GPP) New Radio (NR) system.

[0005] Vehicle-to-everything (V2X) communication can be a communication method for exchanging or sharing road infrastructure and information (such as traffic conditions) by communicating with other vehicles while driving. V2X can include, for example, vehicle-to-vehicle (V2V), which can be long-term evolution (LTE)-based communication between vehicles, vehicle-to-pedestrian (V2P), which can be LTE-based communication between vehicles and user equipment (UE) carried by users, and vehicle-to-infrastructure / network (V2I / N), which can be LTE-based communication between vehicles and roadside units (RSUs) / networks. Here, an RSU can be a transportation infrastructure entity configured by a base station or a fixed terminal, such as an entity that sends speed notifications to vehicles. DETAILED DESCRIPTION

[0006] Technical issues

[0007] One aspect of the present disclosure provides a method and apparatus for determining a physical layer session identification (ID) in a wireless communication system.

[0008] An aspect of the present disclosure also provides a method and apparatus for determining a physical layer session ID in a New Radio (NR) Vehicle-to-Everything (V2X) system.

[0009] One aspect of the present disclosure provides a method and apparatus that can determine a physical layer session ID to perform sidelink communication according to Quality of Service (QoS) requirements in an NR V2X system.

[0010] One aspect of the present disclosure provides a method and apparatus for determining a physical sidelink feedback channel (PSFCH) format in an NR V2X system.

[0011] One aspect of the present disclosure provides a method and apparatus for determining a PSFCH structure in an NR V2X system.

[0012] Other purposes and advantages of the present disclosure can be understood through the following description and can be more clearly understood through the examples of the present disclosure. In addition, it can be easily known that the purposes and advantages of the present disclosure can be achieved through the devices presented in the claims and their combinations.

[0013] Technical Solution

[0014] To achieve these objectives, according to one aspect of the present disclosure, a method for transmitting feedback information from a user equipment (UE) in a New Radio (NR) Vehicle-to-Everything (V2X) system is provided. The method for transmitting feedback information may include: performing a session establishment procedure by a first UE and a second UE based on at least one of unicast and multicast; exchanging ID information between the first UE and the second UE during the session establishment procedure; and completing the session establishment by the first UE and the second UE. When the first UE and the second UE complete the session establishment, a physical layer ID representing the session may be determined.

[0015] Effect

[0016] According to the present disclosure, a physical layer session identification (ID) may be determined in a wireless communication system.

[0017] According to the present disclosure, a physical layer session ID in a New Radio (NR) Vehicle-to-Everything (V2X) system may be determined.

[0018] According to the present disclosure, a physical layer session ID may be determined to perform sidelink communication according to the quality of service (QoS) requirements in the NR V2X system.

[0019] According to the present disclosure, the physical sidelink feedback channel (PSFCH) format in the NR V2X system can be determined.

[0020] In one aspect of the present disclosure, a PSFCH structure in an NR V2X system may be determined.

[0021] Effects achievable by the present disclosure are not limited to the above-described effects, and other effects that are not explicitly discussed herein can be clearly understood by those skilled in the art from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 An example of a frame structure for downlink / uplink transmission according to examples of the present disclosure is shown.

[0023] Figure 2 Examples of resource grids and resource blocks according to examples of the present disclosure are shown.

[0024] Figure 3 An example of a system architecture according to examples of the present disclosure is shown.

[0025] Figure 4 An example of a scenario in which New Radio (NR) Vehicle-to-Everything (V2X) sidelink communication is performed in a 3rd Generation Partnership Project (3GPP) network according to an example of the present disclosure is shown.

[0026] Figure 5 An example of a method of determining a physical layer session ID according to an example of the present disclosure is shown.

[0027] Figure 6 An example of an environment in which multiple unicasts and / or multicasts exist according to examples of the present disclosure is shown.

[0028] Figure 7 An example of a method of determining a physical layer session ID for unicast according to an example of the present disclosure is shown.

[0029] Figure 8 An example of a method of determining a physical layer session ID for multicast according to an example of the present disclosure is shown.

[0030] Figure 9 An example of a method of performing side link communication based on a physical layer session ID according to an example of the present disclosure is shown.

[0031] Figure 10 An example of an environment in which multiple unicasts and / or multicasts exist according to examples of the present disclosure is shown.

[0032] Figure 11 An example of a method of determining a physical sidelink feedback channel (PSFCH) format according to an example of the present disclosure is shown.

[0033] Figure 12 An example of a method of determining a PSFCH format according to an example of the present disclosure is shown.

[0034] Figure 13 An example of a method of determining a PSFCH format according to an example of the present disclosure is shown.

[0035] Figure 14 An example of a method of determining a physical layer session ID according to an example of the present disclosure is shown.

[0036] Figure 15 A diagram showing an example of the structure of a base station device and a terminal device of the present disclosure is shown.

[0037] Best Mode for Carrying Out the Invention

[0038] To achieve this objective, according to one aspect of the present disclosure, a method for transmitting feedback information from a user equipment (UE) in a New Radio (NR) Vehicle-to-Everything (V2X) system is provided. The method for transmitting feedback information may include: performing a session establishment procedure by a first UE and a second UE based on at least one of unicast and multicast; exchanging ID information between the first UE and the second UE during the session establishment procedure; and completing the session establishment by the first UE and the second UE. When the first UE and the second UE complete the session establishment, a physical layer ID representing the session is determined. DETAILED DESCRIPTION

[0040] Various examples of the present disclosure will be described more fully below with reference to the accompanying drawings so that those skilled in the art can easily implement these examples. However, the present disclosure can be implemented in various forms and is not limited to the examples described herein.

[0041] When describing examples of the present disclosure, detailed descriptions of known configurations or functions may be omitted for clarity and conciseness. Throughout the drawings and detailed description, unless otherwise specified, the same drawing reference numerals are understood to refer to the same elements, features, and structures.

[0042] It should be understood that when an element is referred to as being “connected to,” “coupled to,” or “accessed to” another element, it can be directly connected, coupled, or accessed to the other element, or intervening elements may be present. Furthermore, it will be understood that when an element is described as “including / comprising” or “having” another element, it specifies the presence of the other element, but does not preclude the presence of the other element described in other ways.

[0043] In addition, terms such as first, second, etc. may be used to describe elements in the description herein. These terms are used to distinguish one element from another. Therefore, the terms do not limit elements, arrangement order, sequence, etc. Therefore, a first element in one example may be referred to as a second element in another example. Similarly, a second element in one example may be referred to as a first element in another example.

[0044] Here, the distinguishing elements are provided only for the purpose of clearly explaining the various features and do not mean that the elements must be separated from each other. In other words, multiple elements can be integrated into a single hardware or software unit. Moreover, a single element can be distributed to multiple hardware or software units. Therefore, unless otherwise described, integrated or distributed examples are also included in the scope of this disclosure.

[0045] Here, the elements described in various examples may not necessarily be necessary and may be partially optional. Therefore, the examples of the partial set of elements described in the examples are also included in the scope of this disclosure. In addition, the examples of another element other than the elements described in various examples are also included in the scope of this disclosure.

[0046] In addition, the description described herein relates to a wireless communication network, and the operations performed in the wireless communication network can be performed in a process in which a system (e.g., a base station) that controls the wireless network controls the network and sends data, or can be performed in a user device connected to the wireless communication network.

[0047] Obviously, in a network including a base station and multiple network nodes, various operations performed for communicating with a terminal may be performed by the base station or other network nodes other than the base station. Here, the term "base station (BS)" may be used interchangeably with other terms, such as a fixed station, Node B, eNode B (eNB), gNode B (gNB), and access point (AP). In addition, the term "terminal" may be used interchangeably with other terms, such as user equipment (UE), mobile station (MS), mobile subscriber station (MSS), subscriber station (SS), and non-AP station (non-AP STA).

[0048] Here, sending or receiving a channel includes the meaning of sending or receiving information or signals through the corresponding channel. For example, sending a control channel means sending control information or signals through the control channel. Similarly, sending a data channel means sending data information or signals through the data channel.

[0049] In the following description, although the term "New Radio (NR) system" is used to distinguish the system according to various examples of the present disclosure from the existing system, the scope of the present disclosure is not limited thereto. In addition, the term "NR system" used herein is used as an example of a wireless communication system capable of supporting various subcarrier spacings (SCS). However, the term "NR system" itself is not limited to a wireless communication system that supports multiple SCSs.

[0050] Figure 1 An example of NR frame structure and parameters according to an example of the present disclosure is shown.

[0051] In NR, the basic unit of time domain can be T c =1 / (Δf max ·N f ). Here Δf max =480·10 3 , and N f =4096. In addition, κ = T s / T c=64 can be a constant related to the multiple relationship between NR time unit and LTE time unit. In LTE, T s =1 / (Δf ref ·N f，ref ),θf ref =15·10 3 And N f，ref = 2048 can be defined as a reference time unit.

[0052] Frame structure

[0053] Reference Figure 1 , which can include T f =(Δf max N f / 100)·T s = 10 ms is the time structure of the frame used for downlink / uplink (DL / UL) transmission. Here, a single frame may include the time frames corresponding to T sf =(Δf max N f / 1000)·T s = 10 subframes of 1 ms. The number of consecutive Orthogonal Frequency Division Multiplexing (OFDM) symbols per subframe can be In addition, each frame may be divided into two half frames, and the half frame may include subframes 0 to 4 and subframes 5 to 9. Here, half frame 1 may include subframes 0 to 4, and half frame 2 may include subframes 5 to 9.

[0054] Here, the transmission timing of the uplink transmission frame i is determined based on the downlink reception timing at the UE according to Equation 1 below.

[0055] In Equation 1, N TA，offset Indicates the TA offset value due to the difference in duplex mode, etc. Basically, in frequency division duplex (FDD), N TA，offset = 0. In time division duplex (TDD), N TA，offset It can be defined as a fixed value by considering a margin of DL-UL switching time.

[0056] [Equation 1]

[0057] T TA =(N TA +N TA，offset )T c

[0058] Figure 2 Examples of resource grids and resource blocks are shown.

[0059] refer to Figure 2, resource elements within a resource grid can be indexed based on each subcarrier spacing. Here, a single resource grid can be generated for each antenna port and each subcarrier spacing. Uplink / downlink transmission and reception can be performed based on the corresponding resource grid.

[0060] A single resource block may be configured using 12 resource elements in the frequency domain, and an index n for the single resource block may be configured every 12 resource elements. PRB , as expressed in the following Equation 2. The index of the resource block may be used for a specific frequency band or system bandwidth.

[0061] [Equation 2]

[0062]

[0063] parameter( Numerologies )

[0064] The parameters can be configured in various ways to meet the various services and requirements of the NR system. Furthermore, as shown in Table 1 below, the parameters can be defined based on the SCS used in the OFDM system, the cyclic prefix (CP) length, and the number of OFDM symbols per slot. These values ​​can be provided to the UE via the upper layer parameters DL-BWP-mu and DL-BWP-cp (DL) and UL-BWP-mu and UL-BWP-cp (UL).

[0065] In addition, for example, referring to Table 1 below, if μ=2 and SCS=60 kHz, normal CP and extended CP may be applied. In other frequency bands, only normal CP may be applied.

[0066] [Table 1]

[0067]

[0068]

[0069] Here, a normal time slot can be defined as a basic time unit for transmitting a single piece of data and control information in an NR system. The length of a normal time slot can basically include 14 OFDM symbols. In addition, unlike a time slot, a subframe can have an absolute time length corresponding to 1ms in an NR system and can be used as a reference time for the length of another time period. Here, for the coexistence and reverse compatibility of LTE and NR systems, the NR standard may require a time period such as an LTE subframe.

[0070] For example, in LTE, data can be transmitted based on a transmission time interval (TTI) as a unit of time. A TTI can include at least one subframe unit. Here, even in LTE, a single subframe can be set to 1ms and can include 14 OFDM symbols (or 12 OFDM symbols).

[0071] In addition, in the NR system, non-time slots can be defined. Non-time slots may refer to time slots having a number of symbols that is at least one less than the number of symbols of normal time slots. For example, in the case of providing low latency such as ultra-reliable and low latency communication (URLLC) services, the delay can be reduced by non-time slots having a number of time slots that is less than the number of time slots of normal time slots. Here, the number of OFDM symbols included in the non-time slot can be determined based on the frequency range. For example, non-time slots having a length of 1 OFDM symbol in a frequency range of 6 GHz or higher can be considered. As another example, the multiple symbols used to define a non-time slot may include at least two OFDM symbols. Here, the range of the number of OFDM symbols included in the non-time slot can be configured to have a micro-slot length of up to (normal time slot length) -1. Here, although the number of OFDM symbols can be limited to 2, 4 or 7 as a non-time slot standard, it is provided only as an example.

[0072] Furthermore, for example, SCSs corresponding to μ = 1 and 2 can be used in unlicensed bands of 6 GHz or less, while SCSs corresponding to μ = 3 and 4 can be used in unlicensed bands above 6 GHz. Here, for example, if μ = 4, it can be used exclusively for synchronization signal blocks (SSBs), which will be described below. However, this is provided as an example only and the present invention is not limited thereto.

[0073] In addition, Table 2 shows the OFDM symbols of each time slot for each SCS setting. Table 2 shows the number of OFDM symbols per slot, the number of slots per frame, and the number of slots per subframe according to each SCS value, as provided in Table 1. Here, in Table 2, these values ​​are based on a normal slot having 14 OFDM symbols.

[0074] [Table 2]

[0075]

[0076] In addition, as described above, if μ=2 and SCS=60kHz, extended CP can be applied. In Table 3, in the case of extended CP, the OFDM symbol per time slot can be used. Each value is indicated by the number of normal slots being 12. Here, Table 3 shows the number of symbols per slot, the number of slots per frame, and the number of slots per subframe in the case of an extended CP after an SCS of 60 kHz.

[0077] [Table 3]

[0078]

[0079] Hereinafter, the structure of the SSB / Physical Broadcast Channel (PBCH) in the NR system and the initial cell access structure in the NR system are described.

[0080] Here, the NR base station (i.e., gNB) may periodically send signals and channels as shown in Table 4 below to allow initial cell selection for UEs in the cell.

[0081] [Table 4]

[0082]

[0083] For example, the SS / PBCH block may be the aforementioned SSB. Here, even in the NR system, the UE may need to receive a broadcast channel for forwarding synchronization signals and important system information sent from the corresponding wireless access system to perform initial wireless access. To this end, the UE may check the reception sensitivity of the synchronization signal to find the best cell present in the best channel environment. The UE may perform frequency / time synchronization and cell identification operations to perform initial access to the best channel of one or more channels in a specific frequency band based on the checked reception sensitivity operation. The UE may verify the boundary of the OFDM symbol timing through the above operations, and may then initiate PBCH demodulation in the same SSB.

[0084] Here, the UE may receive a PBCH demodulation reference signal (DMRS) and may perform PBCH demodulation. Furthermore, the UE may obtain 3-least significant bit (LSB) information from the SSB index information bit through the PBCH DMRS. The UE may obtain information included in the PBCH payload by performing PBCH demodulation. The UE may perform a process of demodulating SIB 1 based on the information obtained through the PBCH.

[0085] For example, in an NR system, the UE may receive remaining system information (RMSI) as system information not transmitted from the PBCH via a broadcast signal or channel. In addition, the UE may receive other system information (OSI) and a paging channel as other additional system information via a broadcast signal or channel.

[0086] Hereinafter, the UE may access the base station through a random access channel (RACH) procedure and then perform mobility management.

[0087] In addition, for example, when the UE receives an SSB, the UE needs to set the SSB composition and the SS burst setting composition.

[0088] NR V2X services

[0089] In conjunction with V2X services, existing V2X services can support a set of basic V2X service requirements. These requirements are primarily designed with road safety in mind. Therefore, V2X UEs can exchange autonomous status information via sidelinks, as well as information with infrastructure nodes and / or pedestrians.

[0090] Meanwhile, in further evolved V2X services (e.g., LTE Rel-15), new features are introduced by considering carrier aggregation in the side link, high-order modulation, latency reduction, transmit (Tx) diversity, and the feasibility of sTTI. Based on the above description, it is necessary to coexist with V2X UEs (same resource pool) and provide services based on LTE.

[0091] For example, by considering the use case for supporting new V2X services as system aspect (SA) 1, technical features can be classified mainly based on four categories as shown in Table 5 below. Here, in Table 5, "vehicle platooning" may be a technology that enables multiple vehicles to dynamically form a group and operate in the same manner. Moreover, "extended sensor" may be a technology that enables the exchange of data collected from sensors or video images. In addition, "advanced driving" may be a technology that enables vehicles to drive based on semi-automation or full automation. In addition, "remote driving" may be a technology for remotely controlling a vehicle and a technology for providing applications. Based on this, further description related thereto is given in Table 5 below.

[0092] [Table 5]

[0093]

[0094]

[0095] Furthermore, the aforementioned SA1 may consider both LTE and NR as enhanced V2X (eV2X) supporting technologies that support new V2X services. For example, the NR V2X system may be the first V2X system. Furthermore, the LTE V2X system may be the second V2X system. That is, the NR V2X system and the LTE V2X system may be different V2X systems. The following description will be based on a method for satisfying the low latency and high reliability requirements of the NR sidelink based on the NR V2X system. Here, even in the LTE V2X system, the same or similar components may be extended and thus applied. However, this is provided merely as an example and the present disclosure is not limited thereto. That is, even in the LTE V2X system, the present disclosure may be applicable to the interactive portion and is not limited to the following example. Here, for example, the NR V2X capability may not be limited to essentially supporting only V2X services, and the V2X RaT to be used may be selected.

[0096] NR side link

[0097] The NR side link can be used for the above-mentioned NR V2X services. Here, for example, the NR side link frequency can consider FR1 as a frequency of 6 GHz or less and FR2 as a frequency exceeding 6 GHz (for example, up to 52.6 GHz). In addition, for example, the NR side link frequency can consider all unlicensed ITS bands and licensed ITS bands. That is, as described above, a general design approach for supporting various frequency bands may be required. To this end, it may be necessary to consider the NR side link design of the NR system. For example, similar to the NR standard design, although it is not beam-based, even omnidirectional Tx / Rx may basically require an NR side link design that can support beam-based transmission and reception. However, this is provided only as an example.

[0098] In addition, for example, a physical channel of the NR V2X side link may be set. For example, the NR physical side link shared channel (PSSCH) may be a data channel of the NR side link as a physical channel. In addition, for example, the NR physical side link control channel (PSCCH) may be a control channel for the NR side link as a physical channel. Here, scheduling information and control information of the data channel of the NR side link may be forwarded through the NR PSCCH. For example, side link control information (SCI) may be sent based on the format of a field defining control information associated with scheduling of the NR side link data channel, and control information sent through the NR PSCCH may be sent based on the SCI format.

[0099] In addition, for example, an NR physical sidelink feedback channel (PSFCH) may be defined. Here, the NR PSFCH may be an NR hybrid automatic repeat request (HARQ) feedback channel as a physical channel. Here, HARQ-ACK feedback information, channel state information (CSI), and other information corresponding to the NR sidelink data channel may be forwarded via the NR PSFCH. In detail, sidelink feedback control information (SFCI) including feedback information may be forwarded via the NR PSFCH. Here, the SFCI may include information about at least one of HARQ-ACK, channel quality information (CQI), precoding matrix indicator (PMI), rank indicator (RI), reference signal received power (RSRP), reference signal received quality (RSRQ), path gain / path loss, scheduling request indicator (RSI), contention resolution indicator (CRI), interference conditions, vehicle motion, etc. However, this is provided only as an example and the present invention is not limited thereto. Here, for example, the NR PSFCH is further described.

[0100] NR V2X QoS requirements

[0101] Considering the services in Table 5 above, NR V2X QoS requirements can be higher than those of existing V2X (e.g., LTE V2X). For example, based on Table 6 below, latency can be set within 3ms to 100ms. Reliability can be set between 90% and 99.999%. Furthermore, data rates up to 1 Gbps may be required.

[0102] [Table 6]

[0103]

[0104] That is, as described above, considering V2X services, it may be necessary to meet QoS requirements of low latency and high reliability. Here, for example, access layer (AS) level QoS management may be required to meet the QoS requirements. In addition, for example, it may be necessary to consider link adaptation to require HARQ and CSI to meet the QoS requirements. In addition, for example, the maximum bandwidth (maximum BW) capability may be different for each NRV2X UE. That is, it is necessary to exchange AS-level information between UEs based on the above description. For example, the AS-level information may include at least one of UE capabilities, QoS-related information, radio bearer configuration, and physical layer configuration. Moreover, for example, the AS-level information may also include other information. However, this is provided only as an example and the present invention is not limited thereto.

[0105] Table 7 below shows various terms used herein, but is provided only as an example and the present invention is not limited thereto.

[0106] [Table 7]

[0107]

[0108]

[0109] NR side link design

[0110] The NR V2X sidelink design is described to meet the requirements of the new evolved V2X (i.e., eV2X) services.

[0111] Specifically, the synchronization process and method required to form the radio link of the NR side link are provided in detail. Here, it is assumed that the NR side link frequency for NR side link operation is designed by considering all unlicensed ITS bands and licensed ITS bands in FR1 and FR2 (for example, up to 52.6 GHz) and the frequency bands and ranges operated by the NR system, and it is assumed that the NR side link frequency needs to be designed as a common design applicable to all FR1 and FR2. In addition, for the NR V2X side link transmission and reception process, it is necessary to consider the availability of the LTE (ng-eNB) / NR Uu link (i.e., the above-mentioned 3GPP NG-RAN).

[0112] Designs for eV2X synchronization information transmission and signal transmission and reception need to be considered to meet the higher requirements of the newly evolved V2X services. Unlike legacy systems (e.g., LTE), the frequency of NR V2X SL communications based on the required technologies in the new system may also consider at least one element in Table 8 below. By applying NR RV2X SL based on NR wireless connection technology, especially the technologies related to uplink transmission in Table 8 below, the requirements of the new V2X need to be met.

[0113] Furthermore, in addition to the following Table 8, other factors may be considered by considering a new system, and they are provided only as examples, and the present disclosure is not limited thereto.

[0114] [Table 8]

[0115]

[0116] In addition, the NR V2X sidelink physical channels and signals, as well as the basic time slot structure and physical resources can show the corresponding items in the following Table 9.

[0117] [Table 9]

[0118]

[0119]

[0120] also, Figure 3 An example of a basic network architecture configuration and deployment scenario considering the NR V2X sidelink is shown.

[0121] For example, reference Figure 3 NG interfaces may be provided between the nodes 310-1 and 310-2 of the 5th generation core (5GC NW) and the nodes 320-1, 320-2, 330-1, and 330-2 of the NG-RAN. Furthermore, Xn interfaces may be provided between the nodes 320-1, 320-2, 330-1, and 330-2 of the NG-RAN. In the above architecture, the corresponding nodes may be interconnected via corresponding Xn interfaces based on the gNB (NR UP / CP protocol) corresponding to the nodes 320-1 and 320-2 and the ng-eNB (E-UTRA UP / CP protocol) corresponding to the nodes 330-1 and 330-2 constituting the NG-RAN. Furthermore, as described above, in the 5GC, the corresponding nodes may be interconnected via corresponding NG interfaces. For example, in the above architecture, both LTE sidelink UEs and NR sidelink UEs may be controlled by the NG-RAN (e.g., LTE Uu and NR Uu) based on the gNB and ng-eNB. Therefore, when transmitting synchronization information, the NR sidelink UE can receive synchronization information from the LTE Uu or NR Uu link, and can transmit NR sidelink synchronization information (e.g., SL synchronization signal / SL physical broadcast channel (PBCH)) based on the received synchronization information. However, this is provided only as an example and the present disclosure is not limited thereto. That is, the NR sidelink UE can also obtain synchronization information through the LTE Uu link as well as the NR Uu link.

[0122] Meanwhile, with respect to V2X sidelink communication, the V2X sidelink UE may perform V2X sidelink communication. Here, predetermined conditions need to be met so that the V2X sidelink UE can start communication. These conditions may be represented by the following Table 10. That is, the V2X sidelink UE may perform V2X sidelink communication in RRC idle mode, inactive mode, or connected mode. In addition, the V2X sidelink UE that performs V2X sidelink communication needs to be registered on the selected cell on the frequency used, or needs to belong to the same public land mobile network (PLMN). In addition, if the V2X sidelink UE is OOC on the frequency used for V2X sidelink communication, the V2X sidelink UE may perform V2X sidelink communication only when it is possible to perform V2X sidelink communication based on preconfiguration.

[0123] [Table 10]

[0124]

[0125] Here, as described above, in order to start V2X sidelink communication, sidelink synchronization information may be required. Therefore, the UE needs to send sidelink synchronization information. Here, the sending UE (sidelink Tx UE) may receive a configuration for sending the sidelink synchronization information before sending the corresponding synchronization information. Here, for example, the sending UE may receive a configuration for sending the sidelink synchronization information based on a system information message broadcasted from the above-mentioned NG-RAN node or an RRC reconfiguration message (in the case of an RRC-connected UE). In addition, for example, if the NR V2X sidelink UE (hereinafter, referred to as UE) does not exist in the NG-RAN, the UE may send the sidelink synchronization information based on the pre-configured information, as described above.

[0126] Figure 4 An example of a scenario in which NR V2X sidelink communication is performed in a 3GPP network based on the aforementioned description is shown. Here, NR V2X sidelink communication can be performed on a 3GPP network (hereinafter, NG-RAN). In addition, the presence of a Global Navigation Satellite System (GNSS) signal can be considered.

[0127] For details, refer to Figure 4 , each of the NR V2X sidelink UEs may be IC or OOC based on the ng-eNB 610, IC or OOC based on the gNB 620, and IC or OOC based on the GNSS 630. Here, the NR V2X sidelink UE may select a synchronization reference resource based on the location and capability of the UE. In addition, for example, in addition to Figure 6 In addition to the scenarios shown in Table 11 below, the scenarios shown in Table 11 below may also be considered. However, these are provided as examples only and the present disclosure is not limited thereto.

[0128] [Table 11]

[0129]

[0130] Meanwhile, hereinafter, NR SCS may refer to one of the SCS value of NR DL SS / PBCH, the SCS value of NR BWP (data / control channel), and a reference SCS value defined / set for comparison of NR V2X SCS values. As another example, NR SCS may refer to one of the SCS value of NR V2X SLSS / PSBCH, the SCS value of NR V2X BWP or resource pool (data / control channel), and a reference SCS value defined / set for comparison of NR V2X SCS values. However, this is provided only as an example and the present disclosure is not limited thereto. In addition, for example, a 30kHz SCS value may be set as a default value and used for the 5.9GHz ITS spectrum. However, this is provided only as an example and the present disclosure is not limited thereto.

[0131] When performing NR V2X sidelink communication, data transmission can be performed based on unicast or multicast. Here, for example, unicast transmission can refer to sending a message from a single UE to another UE, that is, one-to-one transmission. In addition, broadcast transmission can refer to a scheme in which a message is sent to all UEs regardless of whether the receiving UE supports the service. In other words, a single UE can send a message regardless of whether multiple receiving UEs support the service. Meanwhile, a multicast transmission scheme can be a scheme in which a message is sent to multiple UEs belonging to a group.

[0132] Here, for example, whether to activate unicast, multicast, or broadcast data transmission and reception and whether to perform session connection can be determined at the upper layer. That is, although the physical layer of the V2X UE can operate based on instructions determined at the upper layer, this is provided as an example only and the present disclosure is not limited thereto.

[0133] Furthermore, for example, a V2X UE may perform corresponding transmission and reception after establishing a session for corresponding unicast or multicast data transmission. When the V2X UE performs transmission and reception based on the aforementioned session, the physical layer parameter information for unicast or multicast data transmission may be known in advance in the physical layer of the V2X UE. For example, the V2X UE may have previously received and identified this information from the base station. As another example, this information may be preset for the V2X UE. Here, for example, unicast or multicast data transmission and reception may only be applied when a relatively small number of V2X UEs are around the transmitting V2X UE and the session is maintained stably. Alternatively, if the session is unstable or if the number of neighboring V2X UEs varies significantly, data transmission may be performed based on broadcast transmission. This is provided herein as an example only, and the present disclosure is not limited thereto.

[0134] Furthermore, for example, as described above, unicast or multicast transmission and reception may be determined at the end of the application layer, which is the upper layer. Here, for example, data generated in the application layer and applicable for transmission and reception may not be directly mapped to the radio layer. Here, for example, when performing unicast or multicast transmission and reception, a mapping relationship or connection establishment process may be required to perform data transmission and reception at the radio layer. However, this is provided as an example only, and the present disclosure is not limited thereto.

[0135] Furthermore, for example, when performing unicast data transmission and reception, the corresponding Tx and Rx UEs may need to establish a session by performing a process to discover their presence (e.g., a discovery process), and such session establishment can be performed based on various methods. Here, session establishment between UEs can be performed with the assistance of a base station. The base station can collect the UE's location information and determine whether UEs capable of performing unicast or multicast data transmission and reception are adjacent to each other. Here, for example, the base station can determine whether the UEs are adjacent to each other based on a threshold. Here, a predetermined value can be used to determine the threshold. When the UEs in a cell are determined to be adjacent to each other, the base station can initialize a corresponding discovery process, and the UEs can perform a corresponding discovery process to discover each other based on the initialization process. In addition, the base station can determine whether there are adjacent V2X SL UEs by designing a new discovery channel and periodically transmitting and receiving the corresponding channel. In addition, the base station can determine whether there are adjacent UEs by transmitting corresponding discovery messages on the V2X data channel. However, this is provided merely as an example and the present disclosure is not limited thereto. In other words, session establishment for unicast or multicast data transmission and reception can be completed based on the above process. Subsequently, the upper layer may inform the physical layer of information about the session establishment and may perform physical layer operations such as HARQ-ACK, CSI, and link adaptation.

[0136] PSFCH for sidelink communications

[0137] As described above, a PSFCH for feedback information transmission can be set. For example, in the case of performing NR V2X sidelink communication, the UE can perform transmission based on unicast and / or multicast. Here, a physical layer ID for unicast and / or multicast transmission and reception can be generated. In addition, the UE can provide feedback information through the PSFCH based on the above-mentioned physical layer ID. For example, as described above, high reliability and low latency operation may be required to meet the requirements of the services provided by NR V2X sidelink communication. Therefore, even in sidelink communication, feedback information needs to be constructed and provided. Below, a PSFCH construction method is described based on the above. For example, the PSFCH structure can consider all sequence-based channel structures and channel structures in the form of payload (modulation symbols), which will be described below. In addition, the PSFCH can include sidelink feedback control information (SFCI). Here, the SFCI can include information about the following Table 12 by considering sidelink unicast and / or multicast transmission and reception. That is, the SFCI can include HARQ-ACK information, channel state information (CSI) and signal-related information.

[0138] [Table 12]

[0139]

[0140]

[0141] Here, the HARQ-ACK information may be included in the feedback information (e.g., SFCI) for unicast and / or multicast transmission performed on the side link. For example, if only HARQ-ACK is included in the feedback information, a small number of bits may be used to configure the PSFCH. Here, 1 bit or 2 bits may be used to configure the PSFCH. However, this is provided only as an example. Moreover, a large number of bits may be used to configure the PSFCH. For example, referring to Table 12, the SFCI may include CSI feedback information for link adaptation and multiple-input multiple-output (MIMO) transmission. In addition, for example, HARQ-ACK bits corresponding to multiple TBs may be present on at least one time slot. Here, the SFCI may include HARQ-ACK bit information corresponding to multiple TBs, and the number of bits may be increased based on the information.

[0142] That is, the SFCI size can be set differently based on at least one of the scenario, transmission scheme, and related configuration in the NR V2X sidelink communication. Here, as described above, at least one PSFCH transmission format may be required to effectively handle various SFCI sizes.

[0143] Here, based on the above description, the PSFCH format can be set to a format for forwarding SFCI less than 2 bits or a format for forwarding SFCI greater than 2 bits. For example, if the size of the SFCI is less than or equal to 2 bits, the PSFCH format can consider a sequence-based format or a modulation symbol-based format. This will be further described below.

[0144] Sidelink connection management process and signaling

[0145] For example, the sidelink connection management process may include at least one of connection establishment, connection release, connection maintenance, and security activation. As described above, NR V2X can support unicast and / or multicast transmission. Therefore, a connection management process may be required between UEs involved in unicast and / or multicast transmission. For example, the sidelink connection management process can be performed via the PC5 signaling protocol in the application layer. Furthermore, by considering the AS layer connection management process, release, maintenance, and management can be performed for the AS layer connection. Specifically, AS parameter configuration can be performed by applying relevant channel measurement results, so that specific AS layer operations (e.g., HARQ, CSI, etc.) for the AS layer connection can be performed at the AS layer for the AS layer connection. PC5-RRC may be required. PC5-RRC may refer to the signaling and configuration between the RRC layers generated between UEs performing sidelink V2X communication. That is, PC5-RRC refers to the existing RRC layer and can be distinguished from the RRC layer used for the Uu link (the link between the base station and the UE). For example, the sidelink connection management process may be performed at a higher layer level. That is, the process for establishing a connection between UEs can be performed at a higher layer level. Here, for example, NR V2X may additionally perform a sidelink connection management process at the AS layer level. Here, when the sidelink connection management process is additionally performed at the AS layer level, PC5-RRC may be set.

[0146] For example, in LTE, a connection for unicast transmission between D2D UEs may be established using the PC5 signaling protocol after the discovery process. Furthermore, no session or connection is generated for multicast transmission. No radio bearer may be generated in a one-to-one communication setup set for unicast transmission. Furthermore, a one-to-one Layer 2 link between UEs performing one-to-one communication may be distinguished by the combination of the UE's Layer 2 ID. Here, a UE may be included in multiple Layer 2 links for one-to-one communication using the same Layer 2 ID. In existing D2D connections for one-to-one communication, AS layer information exchange is not performed. The PC5 signaling protocol may be used to establish a one-to-one Layer 2 link between UEs. Here, for example, PC5-S refers to the PC5 signaling protocol stack and may be used to configure, maintain, and release a direct link between two UEs based on control plane signaling via the PC5 interface. In conventional LTE (e.g., LTE D2D), PC5-S signaling may be designated for connection management and may be used for connection management, such as direct connection configuration, maintenance, and release procedures, or security mode, such as security mode procedures. Therefore, in the case of PC5-S, AS layer parameter configuration excluding security-related parameters may not be possible. Here, for example, in NR V2X, multiple unicast and / or multicast connections (or sessions) may exist, and higher QoS may be required compared to existing systems. Considering the above situation, an ID value for each connection may be required, as described below.

[0147] SL layer-1 ID for unicast and / or multicast transmission

[0148] For example, as described above, a SL Layer-1 ID value may be defined in the physical layer to ensure the efficiency and reliability of unicast and / or multicast-based NR V2X communications. That is, a physical layer ID for sidelink communication may be defined. For clarity of description, the SL Layer-1 ID is used here, but this is provided only as an example. That is, the SL Layer-1 ID may indicate the physical layer ID used for sidelink communication, and may also be designated using another name. For example, as described above, high QoS requirements may be required in NR V2X. Therefore, the UE may need to perform HARQ-ACK feedback, link adaptation, or CSI feedback operations in the physical layer. Furthermore, the UE may perform another operation by considering the high QoS requirements required in NR V2X. However, the present disclosure is not limited to this. For example, the SL Layer-1 ID may need to be set for the aforementioned UE operations. In existing V2X (e.g., LTE V2X), only broadcast transmission is supported, as described above. Therefore, the Layer-1 ID value is determined and used based on the 16-bit cyclic redundancy check (CRC) information appended to the SCI in the PSCCH. Furthermore, in LTE D2D, a layer-1 ID value may typically be used in the physical channel based on the destination ID (for layer-1) provided from the Tx UE to the Rx UE in the SCI.

[0149] In contrast, as described above, unlike existing scenarios, NR V2X needs to support data transmission with further diverse and high QoS requirements in the physical layer. Furthermore, by taking this aspect into consideration, sidelink unicast and / or multicast transmission can be performed. That is, each UE can additionally perform unicast and / or multicast transmission in addition to existing broadcast-based sidelink transmission. For example, services requiring high reliability and latency can typically use unicast transmission. Here, since unicast communication is one-to-one communication, there can be more unicast connections (UE pairs for unicast) than in existing sidelink systems. That is, within a limited communication range, various types of sidelink communications can be performed based on high QoS requirements, and therefore, support for transmission that guarantees physical layer reliability is required. Below, a method for setting the above-mentioned SL layer-1 ID value to effectively support NR V2X communication by taking the above-mentioned aspects into consideration will be described. Here, all physical layer channels and signals corresponding to unicast and / or multicast transmission and PSFCH can be transmitted and received using the SL layer-1 ID value used in the physical layer. That is, unicast transmission can be performed using the unicast layer-1 ID value. In addition, a multicast layer-1 ID value may be used to perform multicast transmission. However, this is provided as an example only and the present disclosure is not limited thereto.

[0150] Figure 5 An example of a method for determining the SL layer-1 ID value when a single session is established via a side link between UEs is shown. Figure 5 , the first UE (UE 1) 510 and the second UE (UE 2) 520 can perform a session connection through a unicast session connection process. When connecting a unicast session, the first UE 510 and the second UE 520 can perform unicast V2X communication through at least one resource pool. Here, for example, a single unicast ID value representing a one-to-one connection between UEs can be mapped in each resource pool. In addition, for example, at least one unicast ID value can be mapped between two UEs in a single resource pool. That is, a resource pool that can be used for a single unicast transmission can be set based on the above mapping relationship. Here, for example, the above unicast ID can be a layer-2 ID. Here, the layer-2 ID refers to an ID value for layer 2, and can be used to identify at least one unicast layer 2 link between two UEs. For example, referring to Figure 5 , a layer-2 ID may be generated by a combination of layer-2 IDs (e.g., layer-2 destination ID, layer-2 source ID) of the first UE 510 and the second UE 520. That is, when a session is established between the first UE 510 and the second UE 520, an ID representing the session between the first UE 510 and the second UE 520 may be generated in an upper layer.

[0151] Furthermore, for example, a single multicast ID (group ID) value representing a one-to-many UE connection can be mapped in each resource pool. Furthermore, for example, at least one multicast ID value can be mapped between UEs in a single resource pool. That is, a resource pool available for a single multicast transmission can be set based on the aforementioned mapping relationship. Here, for example, the aforementioned multicast ID can be a Layer 2 ID. The Layer 2 ID refers to an ID value used for Layer 2 and can be used to identify at least one multicast Layer 2 link between UEs, which represents a connection between UEs in the group.

[0152] For example, refer to Figure 5 , a layer-2 ID may be generated by a combination of layer-2 IDs (e.g., layer-2 destination / source IDs) of the first UE 510 and the second UE 520. That is, when a session is established between the first UE 510 and the second UE 520, an ID representing the session between the first UE 510 and the second UE 520 may be generated in an upper layer.

[0153] Here, for example, an ID for identifying each unicast and / or multicast physical link may be required at the physical layer. Specifically, an ID for identifying each unicast and / or multicast physical link may be required to perform operations associated with link adaptation of unicast and / or multicast transmission performed at the physical layer (e.g., HARQ, CSI, and channel measurement).

[0154] refer to Figure 6, first UE 610 can connect to a unicast session with second UE 620. Furthermore, second UE 620 can connect to a unicast session with third UE 630. That is, a single UE can establish unicast sessions with multiple UEs. Here, second UE 620 needs to distinguish between the unicast connection established with first UE 610 and the unicast connection established with third UE 630. Here, second UE 620 can perform sidelink transmission for the corresponding UE by identifying each unicast link. That is, the UE can identify each of the multiple unicast connections in the physical layer and then perform unicast transmission. That is, multiple unicast and / or multicast transmissions can exist between UEs performing sidelink communication. Therefore, as described above, an ID may be required to identify each connection. Here, the ID used to identify each connection can use an ID from a higher layer, and may also use an ID from the physical layer based on operations that take into account link adaptation. Here, for example, if an ID from the physical layer is used as an ID from a higher layer (e.g., a destination ID), QoS requirements may not be met or conflicts may occur. Therefore, a separate ID for the physical layer may be required. However, this is provided only as an example and the present disclosure is not limited thereto. ) method.

[0155] For example, the SL layer-1 ID can be used as a hopping ID value available in the physical layer for PSFCH transmission. In addition, for example, the SL layer-1 ID can be used for another physical layer channel (e.g., PSSCH / PSCCH / PSBCH) and RS (e.g., SL CSI-RS, SLDMRS, SL PT-RS) transmission. Although the following description is based on PSFCH transmission for clarity, it is provided only as an example. That is, the SL layer-1 ID in the physical layer can be set without being limited to the above example.

[0156] Here, for example, the SL layer-1 ID may be a layer-1 link ID derived based on a layer-2 link ID value used to identify an upper layer session. Figure 7 A method for deriving a layer-1 link ID based on unicast transmission is shown. Here, as described above, two UEs connecting a unicast session can share an ID with each other. Here, a layer-2 link ID can be generated by combining the UE ID values ​​shared between the two UEs through the unicast session connection process in the upper layer. For details, refer to Figure 7 , the first UE 710 and the second UE 720 can connect a unicast session. Here, during the process of connecting the unicast session between the first UE 710 and the second UE 720, the ID value of the first UE 710 can be used as the basis. and the ID value of the second UE 720 The combination of the x-bit layer-2 link ID value (b0, b1, b2, ..., b X-1 ). Here, for example, the SL layer-1 ID as the physical layer ID can be generated using the least significant bit (LSB) T bits in the layer-2 link ID value generated with x bits as the layer-2 link ID. That is, the layer-1 link ID can be generated as b0, b1, b2, ..., b T-1· That is, the layer-1 link ID can be used as a partial value of the layer-2 link ID. Therefore, X can be a value greater than T.

[0157] In addition, for example, the layer-1 link ID may be generated from the layer-2 link ID value based on another method. That is, the layer-1 link ID may be a value calculated based on the layer-2 link ID value. The LSB is provided only as an example.

[0158] In addition, for example, Figure 8 A method for deriving a layer-1 link ID based on multicast transmission is shown. Here, in the case of a multicast session, multiple UEs can exist in a group, which is different from unicast. Here, the UEs in the group can share an ID. Here, the layer-2 link ID can be generated by combining the UE ID values ​​shared between the UEs in the group through the multicast session connection process in the upper layer. For details, refer to Figure 8 , the first UE 810, the second UE 820, ..., the (K-1)th UE 830 may connect the multicast session as a single group. Here, during the process of connecting the multicast session in the UEs included in the group, the ID value of the first UE 810 may be used as the basis. ID value of the second UE 820 ...and the ID value of the (K-1)th UE 830 The combination of the x-bit layer-2 link ID value (b0, b1, b2, ..., b X-1 That is, a layer-2 link ID value (b0, b1, b2, ..., b1) having x bits may be generated based on the ID values ​​of all UEs included in the group. X-1 ). Here, for example, in the case of performing multicast transmission, reliable transmission needs to be performed within a limited coverage area. Therefore, all UEs in the group can perform multicast transmission in the same area. To this end, when generating a multicast link, the layer-2 link ID value can additionally consider the area ID value based on the base station configuration and the configuration between the UEs (for example, PC5-RRC). The method of setting the layer-2 link ID value can be optionally enabled or disabled based on the configuration between the UEs or the base station configuration. The area ID value can be determined using the position value of the leader UE in the group or a value set to set the group connection. At the same time, for example, in Figure 8In the example, the operator “+” can indicate the AND, XOR, or combination operation of the ID bits.

[0159] In addition, for example, the layer-2 link ID value associated with the multicast transmission can be determined based on the ID values ​​of some UEs (or multiple UEs) in the group. For example, the UEs included in the group can change flexibly. Therefore, in the case of generating the layer-2 link ID value based on the ID values ​​of all UEs, the reliability of the layer-2 link ID value may be reduced due to the flexibility in the group members. By considering the above description, the layer-2 link ID value can be determined based on the ID values ​​of some UEs (or multiple UEs) in the group. For example, there can be a leader UE (or multiple leader UEs) in each group, and each group can perform operations based on the leader UE. The layer-2 link ID value can be determined based on the ID value of the leader UE (or multiple leader UEs) described above. However, it is provided as an example only and the present disclosure is not limited to this.

[0160] Here, for example, the SL layer-1 ID as the physical layer ID can be generated using the LSB T bits from the layer-2 link ID value having x bits, which is generated as the layer-2 link ID. That is, the layer-1 link ID can be generated as b0, b1, b2, ..., b T-1 That is, the layer-1 link ID can be used as a partial value of the layer-2 link ID. Figure 8 In the example, X can be a value greater than T.

[0161] In addition, for example, the layer-1 link ID may be generated from the layer-2 link ID value based on another method. That is, the layer-1 link ID may be a value calculated based on the layer-2 link ID value. The LSB is provided only as an example.

[0162] Furthermore, for example, a Layer-1 link ID can be generated based on a combination of Layer-1 ID values ​​for each unicast and / or multicast. For example, the Layer-1 ID value can include at least one of a Layer-1 destination ID, a Layer-1 source ID, a HARQ process ID, a member ID of the aforementioned group, and the CRC bits of the associated PSCCH. Here, for example, the Layer-1 destination ID can be used to filter packets at the physical layer. That is, the UE can use the Layer-1 destination ID to verify whether the corresponding packet is assigned to the UE. Furthermore, for example, the Layer-1 new ID can be a Layer-1 source ID, a HARQ process ID, or a group member ID. These are provided as examples only, and the present disclosure is not limited thereto. Here, a Layer-1 link ID can be generated using a combination of the aforementioned Layer-1 ID values. That is, a Layer-1 link ID refers to a Layer-1 ID representing a single unicast or multicast, and can be determined using a combination of the aforementioned Layer-1 ID values. Here, for example, a data Tx UE can indicate the destination Layer-1 ID, source Layer-1 ID, and HARQ process ID values ​​to a UE performing PSFCH transmission using the SCI format. As another example, at least one of the destination layer-1 ID, source layer-1 ID, and HARQ process ID values ​​may be shared between UEs through a session generation process. Furthermore, for example, at least one of the destination layer-1 ID, source layer-1 ID, and HARQ process ID values ​​may be shared between UEs in a corresponding session during an RRC connection generation process. Furthermore, for example, the CRC bits of the relevant PSCCH may indicate that the CRC bits attached to the SCI format transmitted through the PSCCH are used as layer-1 ID values ​​for error correction and verification. As another example, the layer-1 ID value may further include a layer-1 zone ID value. As another example, in the case of multicast, the layer-1 ID value may further include the above-mentioned group member ID value. Here, the layer-1 link ID may be determined based on a combination of the above-mentioned layer-1 ID values.

[0163] In detail, for example, the layer-1 link ID may be here, For unicast can be Moreover, for multicast Can be here, Can be achieved through as well as The combination of values ​​is generated as shown in Table 13 below. Here, in Table 13 below, the "+" operator can indicate the AND, XOR, or combination operation of each ID bit. That is, the "+" operator represents a combination operation, and the present disclosure is not limited thereto.

[0164] In detail, can be determined as one of the above-mentioned layer-1 ID values ​​(alternative 1). Also, for example, It can be determined based on the combination of two layer-1 IDs in the above-mentioned layer-1 ID value (alternative 2). Here, as described above, the combination of the two layer-1 IDs can be performed by an AND or XOR operation of the ID bits. In addition, for example, the combination of the two layer-1 IDs can be performed by another operation. However, this is provided only as an example and the present disclosure is not limited thereto. Moreover, for example, It can be determined based on the combination of three layer-1 IDs in the above-mentioned layer-1 ID value (alternative 3). Here, as described above, the combination of two layer-1 IDs can be performed by an AND or XOR operation of the ID bits. In addition, for example, the combination of two layer-1 IDs can be performed by another operation. However, this is provided only as an example and the present disclosure is not limited thereto. As another example, It can be determined by RRC signaling. Here, RRC signaling can refer to the signaling of RRC configuration between UEs, such as the aforementioned PC5-RRC signaling. Here, it can be determined based on the SL ID value provided by RRC signaling On the contrary, if there is no RRC configuration, it can be determined based on the above-mentioned alternative 1, alternative 2 or alternative 3 Here, for example, the UE may be preset in response to the absence of an RRC configuration to determine However, this is provided as an example only and the present disclosure is not limited thereto. Here, for example, as described above, the following Tables 14 and 15 may relate to the determination of the unicast Methods ( Table 14) and determination for multicast Method ( Table 15). In addition, for example, the layer-1 link ID value can be determined based on a combination of all layer-1 ID values. That is, the present disclosure is not limited to generating a layer-1 link ID value based on a combination of Table 14 and Table 15.

[0165] As another example, determining unicast Method and method for determining multicast For example, since unicast transmission is performed between two UEs, the method of determining the ID of the UE may be different from each other. This is described above using Alternative 1, Alternative 2, or Alternative 3. That is, the layer-1 link ID determination method may be preset to the UE, and the UE may generate a layer-1 link ID based on the preset method. In contrast, in the case of multicast transmission, multiple UEs may exist in one group. Here, the number of UEs included in each group may be different. In addition, the UE members included in the group may be flexibly changed. In view of this aspect, the multicast may be set or provided through RRC signaling similar to that of Alternative 4. That is, determine unicast Methods and methods for determining and using multicast The methods can be different from each other.

[0166] [Table 13]

[0167]

[0168] [Table 14]

[0169]

[0170]

[0171] [Table 15]

[0172]

[0173] In addition, for example, the UE can perform operations for meeting QoS requirements by using the SL layer-1 link ID value. Here, for example, referring to Figure 9 , the first UE 910 and the second UE 920 can establish a unicast session and can perform side link communication. Here, the SL layer-1 link ID value used by the UE (e.g., the first UE 910) that transmits PSCCH / PSSCH can be generated based on the layer-1 destination ID. In addition, the SL layer-1 link ID used by the UE (e.g., the second UE 920) to transmit HARQ feedback (SFCI) can be generated based on at least one of the layer-1 destination ID, source ID, group member ID, and HARQ process ID values. That is, each of the first UE 910 and the second UE 920 that establish a unicast session can use a different SL layer-1 link ID. For example, each UE can use a different SL layer-1 link ID value based on transmission information. In addition, for example, the first UE 910 and the second UE 920 can use the same SL layer-1 link ID value. However, this is provided only as an example and the present disclosure is not limited thereto. In addition, Figure 9 Only a single example for generating and applying the SL layer-1 link ID value is shown. That is, the SL layer-1 link ID value generated by another combination can be used for different physical channels and RSs. However, the present disclosure is not limited thereto.

[0174] Furthermore, for example, when a Layer 1 Link ID for unicast and / or multicast transmission is provided by RRC signaling between a base station or a UE, or by an upper layer, the Layer 1 Link ID may be determined based on the value provided by the RRC signaling or the upper layer. That is, if a new Layer 1 Link ID value is set by PC5 RRC signaling, the set value may be used. Conversely, unless a new Layer 1 Link ID value is set by PC5 RRC signaling, the Layer 1 Link ID may be generated as described above.

[0175] As described above, the Layer-1 Link ID can be generated as a physical layer ID. For example, a method for applying a unicast Layer-1 ID (hereinafter, L1 U-ID) value or a multicast Layer-1 ID (hereinafter, L1 G-ID) value to PSFCH transmission is described below. Here, it is provided only as an example. The session link ID value can be used for other physical channels and signals. That is, the present disclosure is not limited thereto. In the following, a method for a feedback channel is described based on the above description.

[0176] For example, a PSFCH format based on a Zadoff-Chu (ZC) sequence may be considered. Here, a ZC sequence refers to an orthogonal sequence and may be one of a constant amplitude zero autocorrelation (CAZAC) sequence. Here, the PSFCH format may be determined based on the ZC sequence. For example, a ZC sequence may be based on a single cyclic sequence α and its base sequence according to the following equation 3: To generate.

[0177] [Equation 3]

[0178]

[0179] In Equation 3, for example, M ZC As the length of the sequence, it can be Here, m represents a value corresponding to the number of resource blocks (RBs), each resource block being allocated a sequence, and for the PSFCH format, m may be δ = 0. In addition, a plurality of base sequences may be classified into sequence group numbers u∈{0, 1, ..., 29} and base sequence numbers v in the corresponding groups. Here, a single base sequence v = 0 may be set based on the ZC sequence length. In addition, for example, two base sequences v = 0 or 1 may be configured based on the ZC sequence length. In detail, considering the case where the PSFCH format is mapped onto a small number of PRBs as a single PRB or two PRBs and thereby used to transmit information (e.g., ACK / NACK), there is only a single base sequence (v = 0) in the sequence group. However, this is provided only as an example and the present disclosure is not limited thereto. Here, if the sequence length is less than 36 (e.g., M ZC∈{6, 12, 18, 24}), the base sequence can be determined according to the following equation 4.

[0180] [Equation 4]

[0181]

[0182] For example, in Equation 4, the sequence length M can be based on the following Table 16 (e.g., ZC =12) to determine its value For example, another sequence length may use the values ​​shown in another table. However, this is provided only as an example and the present disclosure is not limited thereto.

[0183] [Table 16]

[0184]

[0185]

[0186] Hereinafter, sequence group / sequence shift hopping and cyclic shift (CS) hopping of the PSFCH format can be used based on the above description. For example, as described above, the PSFCH format provided on the sidelink can only forward 1-bit or 2-bit HARQ-ACK (or only NACK).

[0187] For example, a single PSFCH format can be used to forward SFCI based on a ZC sequence. Here, in order to generate a ZC sequence according to the above equations 3 and 4, it may be necessary to determine the sequence group u and sequence number v in the corresponding group. Subsequently, the CS value can be determined, and the final AC sequence can be generated. Here, referring to Table 16 above, the ZC sequence can have 30 base sequences. Therefore, in the case of generating a single base sequence, it is necessary to select a sequence group number u for the base station. Here, for example, u can be determined based on the following equation 5, and u can jump. Here, f gh can be a sequence group hopping mode, and f ss It can be a shift offset. That is, u can be changed (or jumped) based on a predetermined time or condition. In this way, the above-mentioned interference situation can be reduced.

[0188] [Equation 5]

[0189] u=(f gh +f ss )mod30

[0190] Here, refer to Figure 10, in NR V2X, at least one unicast and / or multicast session connection can be generated between multiple UEs. That is, in an adjacent area, each UE can perform multiple unicast and / or multicast session connections. Here, for example, as described above, the UE can perform sidelink data transmission on a determined physical resource. Here, the determined physical resource is selected based on the sensing operation for the Rx UE to determine the Tx UE, and a transmission operation can be performed. Here, for example, when there are multiple unicast and / or multicast sessions between adjacent UEs, a "hidden node problem" or an invalid resource configuration (e.g., an incorrectly configured authorized resource configuration) problem may occur despite the selection of resources. Here, independent AS parameters can be set for each unicast and / or multicast session. Therefore, many conflicts may occur on the sidelink resources, and interference may occur based on the environment in which the adjacent UEs are located.

[0191] Specifically, unicast and / or multicast session connections can be independently established between UEs located outside of and within partial coverage (e.g., UEs not controlled by the base station). Consequently, potential conflicts and interference may exist between different unicast, multicast, and broadcast transmissions generated between multiple UEs. To meet high QoS requirements by considering the sidelink communication environment, it is necessary to provide reliable link performance by maximizing the interference randomization effect in the PSFCH.

[0192] Therefore, it is necessary to perform the sequence group hopping pattern f according to the above equation 5 gh and sequence shift f ss . For example, parameter configuration regarding hopping for single unicast or multicast side link transmission and reception may be determined between UEs involved in corresponding unicast or multicast transmissions. Here, information regarding whether the above-mentioned hopping is performed may be exchanged through RRC signaling. In addition, for example, the information regarding whether the hopping is performed may always be fixed, or may be determined based on different parameters. However, this is provided only as an example and the present disclosure is not limited thereto. In detail, for example, a case may be considered where sequence group hopping is "enabled" at all times for PSFCH transmission. In contrast, sequence hopping in a PSFCH sequence group (e.g., v=0) may not be performed. That is, the parameters associated with sequence group hopping may be fixed at least for PSFCH transmission. The detailed method may be represented by Equation 6 below.

[0193] [Equation 6]

[0194]

[0195]

[0196] v=0

[0197] or,

[0198]

[0199] f ss =n ID mod30

[0200] v=0

[0201] Here, for example, if only a single PSFCH transmission is allowed for a single slot in NR V2X, the hopping method based on the above equation 6 can be applied. If the value is 0, then f gh It can be used as the equation after equation 6. Here, the above-mentioned SL layer-1 ID or hopping ID n ID To change the shift offset value f ss Here, if the jump ID is used, then You can replace n in Equation 6 ID Basically, n can be exchanged between UEs through the unicast / multicast session connection process or PC5-RRC connection reestablishment process. ID .otherwise, A UE that expects to receive PSFCH (eg, a UE that previously performed PSSCH data transmission) may provide n ID The value is provided to the UE that sends the PSFCH. In addition, the value n ID Can be generated by UE to have a and a larger number of bits or a combination of random bits (e.g., 8->16 bits) of other information, and may be provided to the corresponding UE and the UE associated with the unicast / multicast session connection. For example, n having a length of 16 bits ID You can add The source ID (8 bits) and / or UE member ID of the UE and a part or all of the random bits with an additional 8-bit length or other layer-1 ID information bits are generated and provided to the associated UE. In this way, the effect of randomizing the interference between UEs belonging to different UE pairs can be provided. In addition, n ID The number of bits is not limited to the above 16 bits and can be greater than 8 bits. In the following sequence generation method, it is also possible to consider Replace with n ID Therefore, different offset values ​​can be set for each ID. That is, different u values ​​can be generated. Here, refer to Figure 11 , we can consider the case where PSFCH transmission uses two OFDM symbols and sequence group hopping is set for each OFDM symbol. Here, in the first OFDM symbol The value can be 0, and in the second OFDM symbol The value can be 1. That is, if PSFCH format 0 is set to use two OFDM symbols for transmission, SFCI can be transmitted based on different base sequences for each symbol. Here, unless transmission is performed based on the above description, The value can always be 0. In this case, PSFCH format 0 using two OFDM symbols can transmit SFCI based on the same base sequence for each symbol.

[0202] As another example, if at least one PSFCH transmission is allowed for at least one time slot in NR V2X, a hopping method based on the following equation 7 may be applied. In detail, for example, if only a single HARQ-ACK transmission is allowed for a single time slot, it may be difficult to meet the delay requirement in terms of ultra-reliable low-latency communication (URLLC). Based on this, at least one PSFCH transmission may be considered in a single time slot. For example, referring to Figure 12 , HARQ-ACK for each of TB 1 and TB 2 can be transmitted in the first time slot. That is, PSFCH 1 for TB 1 and PSFCH 2 for TB 1 can each be transmitted in a single time slot. Here, different base sequence values ​​can be generated for each of PSFCH 1 and PSFCH 2. Therefore, if multiple PSFCH transmissions for NR V2X communication are configured in a single time slot, OFDM symbol index 1 can be additionally considered. In this way, a base sequence can be generated based on a symbol unit, and different base sequences can be used based on the symbol unit. Here, a different base sequence value can be generated for each PSFCH transmission in a time slot.

[0203] [Equation 7]

[0204]

[0205]

[0206] v=0

[0207] As another example, the parameters for the sequence group hopping method may be set based on RRC signaling. Here, if it is indicated that all sequence group hopping and sequence hopping are not to be performed, f gh and v may be 0, as expressed in the following Equation 8. That is, neither group hopping nor sequence hopping may be performed.

[0208] [Equation 8]

[0209] f gh =0

[0210] v=0

[0211] In contrast, if sequence group hopping is performed based on RRC signaling and sequence hopping is not performed, it may correspond to the above-described case where sequence group hopping is “enabled” at all times.

[0212] Furthermore, for example, for the above-described sequence hopping pattern, the random sequence c(i) used for the sequence hopping pattern may be initialized based on the following equation 9. Here, the random sequence c(i) may be initialized at the beginning of each DFN, or may be initialized in the PSFCH transmission start OFDM symbol. However, this is provided merely as an example and the present disclosure is not limited thereto.

[0213] [Equation 9]

[0214]

[0215] At the same time, by considering the above SL layer-1 To set c init Here, if you pass a combination of many ID values If is set to have a large value, a larger number of sequence hopping patterns can be used in terms of sequence hopping. That is, if Combined with a large value, an interference randomization effect can be obtained. For example, by referring to Tables 13 to 15 above, it can be considered to use all 8 bits in the physical layer. and Here, if a single ID value is generated but Eight sequence hopping patterns can be provided. On the contrary, if the but 16 sequence hopping patterns can be provided. In detail, the hopping pattern sequence can be generated by the pseudo-random sequence c(i) based on the above equation 9, and its random sequence can be initialized. Therefore, as mentioned above, the sequence hopping pattern can be considered Combination changes.

[0216] As another example, if the sequence group hopping configuration of PSFCH is disabled, the sequence shift value and the sequence value in the group may be determined based on the aforementioned SL layer-1 ID value.

[0217] [Equation 8-1]

[0218] f gh =0 f gh =0

[0219]

[0220] or

[0221] Regarding the sequence hopping pattern described above, the random sequence c(i) used for the sequence hopping pattern can be initialized based on the following equation 9-1. Here, the random sequence c(i) can be initialized at the beginning of each DFN, or can be initialized in the PSFCH transmission start OFDM symbol. However, this is provided as an example only and the present disclosure is not limited thereto. and The value of can be applied in the same way as above. For example, The value may always be 0. If a different v value is used for each OFDM symbol, then l' is used as the OFDM symbol index in the PSFCH transmission slot.

[0222] [Equation 9-1]

[0223]

[0224] Furthermore, for example, in the case of performing multicast transmission, the sequence hopping method for PSFCH transmission can be similarly applied to the above-mentioned case of performing unicast transmission based on the layer-1 link ID value of multicast. Here, for example Can be and SL layer-1 multicast link The values ​​may be applied to have the same sequence hopping pattern and sequence shift offset value in the group.

[0225] As another example, even with the same base sequence, the interference effect can be minimized by applying different CS hopping. In detail, for example, as described above, the PSFCH format can forward SFCI based on the ZC sequence, and therefore, the CS hopping operation represented by the following equation 10 can be performed.

[0226] [Equation 10]

[0227]

[0228] In Equation 10, Represents a time slot index in a DFN or sidelink radio frame, and l represents an OFDM symbol number in a PSFCH transmission. For example, the first symbol for PSFCH transmission may be l=0, and the second symbol may be l=1. In addition, l′ represents an OFDM symbol index in a time slot in which a PSFCH transmission exists. In addition, m0 represents an initial CS value. Here, the CS value may be a starting offset value. For example, if the m0 value is set by the above-mentioned PC5-RRC signaling, the set initial CS value m0 may be used. Conversely, unless the m0 value is set by PC5-RRC signaling, m0 may be determined based on the following equation 11.

[0229] [Equation 11]

[0230]

[0231] As another example, the aforementioned initial CS value m0 can be determined using the "PSFCH Resource Indicator" in the SCI. That is, information indicating the initial CS value m0 can be transmitted using the SCI included in the PSCCH transmitted from the Tx UE. Here, the Rx UE can use the information obtained from the SCI for PSFCH transmission. Conversely, unless the initial CS value m0 is indicated by the "PSFCH Resource Indicator" in the SCI, m0 can be determined according to the aforementioned Equation 11.

[0232] As described above, different groups with independent multicast link ID values ​​can have independent CS start values ​​between the groups, and can perform PSFCH transmission based on the start value. That is, with the above method, even when using the same base sequence, PSFCH transmission can be performed at the same time using different CS values ​​for UEs that have previously performed group transmission.

[0233] Both methods can perform PSFCH transmission for UEs that have previously performed group transmission at the same time point using the same base sequence in the group and different CS values. Here, as described above, the m0 value can be provided from a specific UE or can be determined based on the multicast link ID value.

[0234] In addition, for example, m cs The value may differ based on whether the HARQ-ACK value includes 1 bit or 2 bits, and may be represented by Table 17 or Table 18 below. Here, the HARQ-ACK value may be "0: ACK, 1: NACK". In addition, for example, in the case where only NACK is transmitted, the HARQ-ACK value may be defined as "0: NACK, 1: DTX". However, this is provided only as an example and the present disclosure is not limited thereto. In particular, in the case where only NACK is transmitted, PSFCH transmission may not be performed for ACK. On the contrary, the data Tx UE that expects PSFCH reception does not know whether the PSCCH is successfully received at the Rx UE. Therefore, as described above, retransmission may be determined by forwarding the DTX status to the data Tx UE. The value m in Table 17 or Table 18 below cs The values ​​are not limited thereto. Any value from [0 to 11] can be used for the HARQ-ACK value (e.g., Table 17: (0 or 1), Table 18: ({0, 0}, {0, 1}, {1, 1}, {1, 0}).

[0235] [Table 17]

[0236] HARQ-ACK value 0 1 Sequence cyclic shift <![CDATA[m cs =0]]> <![CDATA[m cs =6]]>

[0237] [Table 18]

[0238] HARQ-ACK value {0,0} {0,1} {1,1} {1,0} Sequence cyclic shift <![CDATA[m cs =0]]> <![CDATA[m cs =3]]> <![CDATA[m cs =6]]> <![CDATA[m cs =9]]>

[0239] Furthermore, for example, if a different CS hopping method is determined for each OFDM symbol, a function n represented by the following equation 12 may be determined: cs (n c , l). Here, we can Use a random sequence to determine the function n cs (n c , 1). The above describes a method for determining method.

[0240] [Equation 12]

[0241]

[0242] The ZC sequence generated based on the above description can be converted into the ZC sequence using one or two OFDM symbols according to the following equation 13. Mapped to physical resources.

[0243] [Equation 13]

[0244]

[0245]

[0246]

[0247] As another example, a PSFCH format that considers modulation symbols in addition to the above sequence-based PSFCH format can be considered. Here, the PSFCH format can be a PSFCH format that multiplies the modulation symbols by a ZC sequence. Then mapped to the format of the physical resource. For example, if the number of SFCI bits is 1 bit or 2 bits (e.g., HARQ-ACK), a single modulation symbol d(0) can be generated by applying each of binary phase shift keying (BPSK) modulation and quadrature phase shift keying (QPSK) modulation. Here, the modulation symbol d(0) can be extended by the length of the ZC sequence obtained by multiplying the modulation symbol d(0) by the above-mentioned ZC sequence. For example, the following equation 14 can represent a symbol y(n) having an extended value, which is a sequence length corresponding to a single PRB.

[0248] [Equation 14]

[0249]

[0250]

[0251] Furthermore, the symbol y(n) can be additionally multiplied by the orthogonal sequence w in block-wise form i (m), which can be expressed by the following equation 15.

[0252] [Equation 15]

[0253]

[0254]

[0255]

[0256]

[0257] Here, for example, in Equation 15, w can be set by PC5-RRC signaling i For example, if w is set by PC5-RRC signaling i (m), the set orthogonal sequence index value i may be used. Conversely, unless the orthogonal sequence index value i is set through PC5-RRC signaling, the orthogonal sequence index value i may be represented by the following equation 16.

[0258] [Equation 16]

[0259]

[0260] As another example, in Equation 15, w i The orthogonal sequence index value i of (m) can be indicated by the "PSFCH resource indicator" of the SCI. That is, the data Tx UE can indicate a value to the Rx UE through the SCI included in the PSCCH. For example, if the orthogonal sequence index value i is indicated by the PSFCH resource indicator, the set orthogonal sequence index value i can be used. Conversely, unless the orthogonal sequence index value i is set by the PSFCH resource indicator, the orthogonal sequence index value i can be expressed by the following equation 16.

[0261] That is, if information about selection of a CS value of a ZC sequence and selection of an orthogonal sequence index value is provided from a Tx UE to an Rx UE through a PSCCH, or if the information is preset through PC5-RRC signaling, PSFCH transmission can be performed based on the indicated values.

[0262] On the contrary, if there is no pre-signaling, the physical layer ID value defined above can be used to The CS value and orthogonal sequence index value of the ZC sequence are selected by using the value.

[0263] As another example, the PSFCH resource index may be based on Determined in different forms. Here, the PSFCH resource index can indicate the CS value of the ZC sequence and the orthogonal sequence index value. Here, the mapping relationship between the PSFCH resource index, the CS value of the ZC sequence and the orthogonal sequence index value can be pre-set through PC5-RRC signaling and can be indicated based on the mapping relationship. At the same time, for example, It can be the length of the orthogonal sequence. Here, by referring to Table 20 below, The orthogonal sequence is determined based on the above Equation 15 and Equation 16 with the orthogonal sequence index value.

[0264] In detail, in addition to the number of OFDM symbols allocated with the demodulation synchronization signal (DMRS), the number of OFDM symbols allocated with the PSFCH (SCFI) can be And whether intra-slot hopping is set, the length of the orthogonal sequence is determined based on the following Tables 19 and 20. Here, Indicates the total number of OFDM symbols to which RS and SFCI are allocated. Figure 13 , The value is 4 and can be set differently depending on whether intra-slot hopping is set.

[0265] For example, reference Figure 13 (a), unless the time slot jump is set, On the contrary, reference Figure 13 (b) If intra-slot hopping is set, then For m′=0 and For m'=1. That is, different values ​​can be applied. In particular, if intra-slot hopping is performed, each of the first m'=0 and the last m'=1 in the slot can be multiplied by an orthogonal sequence. For details, refer to Figure 13 (b), corresponding to The orthogonal sequence can be used for all m'=0 and m'=1. Here, by referring to the following Table 20, The value may be 0, and a final orthogonal sequence may be generated. In addition, for example, it may be considered whether RRC signaling is provided for the starting PRB of the intra-slot hopping. Here, unless RRC signaling is provided for the starting PRB of the intra-slot hopping, the starting PRB may be the lowest PRB index value allocated to the data channel. Here, the second hop of the subsequent ending PRB in which the hopping is performed may correspond to the highest PRV index value allocated to the data channel. As another example, the indices of the starting PRB and the ending PRB in the resource area allocated to the data channel may be determined by another method for different hopping based on the above-mentioned SL ID value. However, it is provided as an example only and the present disclosure is not limited thereto.

[0266] [Table 19]

[0267]

[0268] [Table 20]

[0269]

[0270] In addition, for example, the PSFCH structure for transmitting feedback information based on the PSFCH format can be set based on the sidelink data channel structure. For example, the original SFCI bits (e.g., PSFCH format) can be scrambled after channel coding and rate matching. Here, in the case of single-layer transmission, q can be 0, and the encoded SCFI bits by can be transmitted on the PSFCH with a length of b (q) (0), ..., b (q) Here, the available resources (the number of resource elements (REs) and the modulation scheme) corresponding to a fixed number of PRBs may be determined. Here, the fixed number of PRBs used for PSFCH transmission can be preset based on the size of the original SCFI, or can be set based on RRC signaling. In addition, for example, the scrambling for PSFCH can be determined based on the following equation 17. Here, the scrambling sequence c can be generated based on a random sequence (q) (i), and the corresponding initialization value can be expressed by the following equation 18. Here, for example, in equation 18, The value may be an ID used in the physical layer as the above-mentioned SL ID value.

[0271] [Equation 17]

[0272]

[0273] [Equation 18]

[0274]

[0275] In addition, for example, QPSK can be used for PSFCH modulation. In addition, layer mapping and precoding can be transmitted based on a waveform (eg, CP-OFDM or SC-FDMA) finally determined under the assumption of single-layer and single-antenna transmission.

[0276] Here, for example, the various types of PSFCH formats described above may be preset for the UE. Furthermore, for example, various types of PSFCH formats may be provided between UEs associated with unicast / multicast transmissions via PC5-RRC signaling. However, this is provided as an example only and the present disclosure is not limited thereto. Here, for example, if the PSFCH resource configuration of a single NR V2X UE is set and determined based on PC5-RRC signaling in unicast or multicast transmission, part or all of the information included in Table 21 below may be provided via RRC signaling. However, this is provided as an example only and the present disclosure is not limited thereto.

[0277] [Table 21]

[0278]

[0279]

[0280] Figure 14 1 is a flowchart illustrating an example of a method for determining a physical layer session ID. Figure 14 In operation S1410, the UE may perform a unicast or multicast session connection procedure. Figures 1 to 13 As described above, two UEs can perform session connection through a unicast session connection process. In addition, for example, multiple UEs can perform multicast session connection based on a multicast session connection process. Here, as described above, in operation S1420, the UEs can exchange ID information during the session connection process. In operation S1430, the UEs can determine the physical layer ID representing the session established between the UEs based on the exchanged ID information. For example, the physical layer ID may be a layer-1 link ID derived based on a layer-2 link ID value for identifying an upper layer session. In addition, for example, as described above, a layer-1 link ID can be generated based on a combination of layer-1 ID values ​​for each of unicast and / or multicast. For example, the layer-1 ID value may include at least one of a layer-1 destination ID, a layer-1 source ID, a HARQ process ID, and a CRC bit of an associated PSCCH.

[0281] Figure 15 This is a diagram showing an example of a base station apparatus and a terminal apparatus.

[0282] refer to Figure 15 , the base station device 1500 may include a processor 1520 , an antenna device 1512 , a transceiver 1514 , and a memory 1516 .

[0283] The processor 1520 may perform baseband-related signal processing and may include upper layer processing 1530 and physical layer processing 1540. The upper layer processing 1530 may process operations of the media access control (MAC) layer, the radio resource control (RRC) layer, or more upper layers. The physical layer processing 1540 may process operations of the physical (PHY) layer (e.g., uplink receive signal processing and downlink transmit signal processing). In addition to performing baseband-related signal processing, the processor 1520 may also control the overall operation of the base station device 1500.

[0284] Antenna assembly 1512 may include at least one physical antenna. If antenna assembly 1512 includes multiple antennas, multiple-input multiple-output (MIMO) transmission and reception may be supported. Transceiver 1514 may include a radio frequency (RF) transmitter and an RF receiver. Memory 1516 may store operational processing information for processor 1520 and software, an operating system (OS), applications, etc. associated with the operation of base station device 1500, and may include components such as a buffer.

[0285] The processor 1520 of the base station device 1500 may be configured to implement the operations of the base station in the examples disclosed herein.

[0286] Terminal device 1550 may include a processor 1570, an antenna device 1562, a transceiver 1564, and a memory 1566. Furthermore, for example, communication between terminal devices may be performed based on sidelink communication. That is, each terminal device 1550 performing sidelink communication may also represent a device performing sidelink communication with other terminal devices 1550 in addition to base station device 1500. However, this is provided merely as an example.

[0287] The processor 1570 may perform baseband-related signal processing and may include upper layer processing 1580 and physical layer processing 1590. The upper layer processing 1580 may process operations of the MAC layer, RRC layer, or more upper layers. The physical layer processing 1590 may process operations of the PHY layer (e.g., downlink receive signal processing and uplink transmit signal processing). In addition to performing baseband-related signal processing, the processor 1570 may also control the overall operation of the terminal device 1550.

[0288] Antenna assembly 1562 may include at least one physical antenna. If antenna assembly 1562 includes multiple antennas, MIMO transmission and reception may be supported. Transceiver 1564 may include an RF transmitter and an RF receiver. Memory 1566 may store operational processing information for processor 1570 and software, an operating system, applications, and the like associated with the operation of terminal device 1550, and may include components such as a buffer.

[0289] The processor 1570 of the terminal device 1550 may be configured to implement the operations of the terminal in the examples described herein.

[0290] Furthermore, for example, the processor 1570 of the terminal device 1550 may perform sidelink communication with another terminal device. Here, for example, the processor 1570 of the terminal device 1550 may establish a multicast and / or unicast session with the other terminal device 1550. Furthermore, for example, the processor 1570 of the terminal device 1550 may determine a physical layer session ID based on the established session. Furthermore, for example, the processor 1570 of the terminal device 1550 may perform operations to meet QoS requirements based on the determined physical layer session ID, as described above.

[0291] The various examples herein are for explaining representative aspects of the present disclosure, rather than describing all possible combinations and contents described in the various examples, which may be applied independently or by combinations of at least two thereof.

[0292] In addition, various examples of the present disclosure may be implemented by hardware, firmware, software, or a combination thereof. In the case of hardware implementation, the examples may be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), general purpose processors, controllers, microcontrollers, microprocessors, and the like.

[0293] The scope of the present disclosure includes software or machine-executable instructions (e.g., OS, applications, firmware, programs, etc.) that enable the operations of various example methods to be performed on a device or computer, as well as non-transitory computer-readable media that store such software or instructions for execution on a device or computer.

[0294] Industrial Applicability

[0295] The present disclosure applies to a process of determining a sidelink physical layer session ID in a wireless communication system, and applies to a process of a user equipment (UE) sending feedback information in an NR V2X system.

Claims

1. A method for sidelink wireless communication, the method comprising: Receiving, through the first wireless user equipment, a radio resource control RRC signaling configuration indicating a side link SL identifier ID value; Determine the SL layer-1 ID based on the least significant bit (LSB) of the layer-2 ID. receiving at least one data packet from a second wireless user equipment via a physical sidelink shared channel (PSSCH) based on the SL layer-1 ID; Generate an orthogonal sequence for the physical sidelink feedback channel (PSFCH) format based on the following information: The SL ID value; as well as Cycle hopping parameters; and Based on the orthogonal sequence, SL feedback control information SFCI is sent to the second wireless user equipment via the PSFCH.

2. The method of claim 1, wherein the layer-2 ID is used to identify at least one of: a unicast layer-2 link; or a multicast layer-2 link.

3. The method of claim 1 , wherein the layer-2 ID comprises at least one of: a layer-2 source ID; or a layer-2 destination ID, The SL layer-1 ID includes at least one of the following: a layer-1 source ID; or a layer-1 destination ID.

4. The method according to claim 3, further comprising: receiving a Physical Sidelink Control Channel (PSCCH) transmission from the second wireless user equipment indicating control information associated with scheduling of the PSSCH; receiving sidelink control information (SCI) from the second wireless user equipment, wherein an SCI format of the SCI indicates the layer-1 source ID and the layer-1 destination ID; as well as At least one sidelink hybrid automatic repeat request (HARQ) feedback bit for PFSCH transmission is determined based on the at least one data packet received via the PSSCH. The method according to claim 1 , wherein an initial value Cinit for generating the orthogonal sequence is determined based on the SLID value.

6. The method of claim 1 , wherein the SL layer-1 ID is used to filter packets on a physical layer of the first wireless user equipment, and Wherein the SL layer-1 ID consists of T bits, and the layer-2 ID consists of X bits, where X is greater than T. 7 . The method according to claim 1 , wherein the SFCI comprises SL hybrid automatic repeat request (HARQ) feedback information associated with the PSSCH.

8. The method according to claim 1, wherein the orthogonal sequence is based on is generated, where α is the cycle hopping parameter, u is the sequence group of the orthogonal sequence, and v is the sequence number of the sequence group of the orthogonal sequence, and for PSFCH format, δ is zero. 9 . The method according to claim 8 , wherein a sequence group u of the orthogonal sequences is determined based on the SL ID value.

10. The method according to claim 9, wherein the sequence group u is based on is determined where the SLID value is as well as The sequence number v in the sequence group is set to zero.

11. The method of claim 8, wherein the cycle hopping parameter α is determined based on m0, wherein m0 is determined based on a multicast link ID.

12. The method of claim 11, wherein the SL layer-1 ID comprises at least one of: a layer-1 source ID; or a layer-1 destination ID, and The multicast link ID is based on at least one of the following: the layer-1 source ID; or The ID of the group member in the group.

13. A method for sidelink wireless communication, the method comprising: Receiving, through the first wireless user equipment, a radio resource control RRC message indicating a side link SL identifier ID value; Determine the layer-1 source ID based on the least significant bit (LSB) portion of the layer-2 source ID; Determine the layer-1 destination ID based on the least significant bit (LSB) portion of the layer-2 destination ID; receiving at least one data packet from a second wireless user equipment via a physical sidelink shared channel (PSSCH) based on the layer-1 destination ID; Generate an orthogonal sequence for the physical sidelink feedback channel (PSFCH) format based on the following information: the SL ID value; and the layer-1 source ID; and Based on the orthogonal sequence, SL feedback control information SFCI is sent to the second wireless user equipment via the PSFCH.

14. The method according to claim 13, wherein the orthogonal sequence is based on is generated, where α is a cyclic hopping parameter, u is the sequence group of the orthogonal sequence, and v is the sequence number of the sequence group of the orthogonal sequence, and for PSFCH format, δ is zero.

15. The method according to claim 14, wherein the sequence group u is based on is determined where the SLID value is as well as The sequence number v in the sequence group is set to zero.

16. The method of claim 14, wherein the cycle hopping parameter α is determined based on m0, wherein m0 is determined based on the layer-1 source ID.

17. The method according to claim 13, further comprising: receiving a Physical Sidelink Control Channel (PSCCH) transmission from the second wireless user equipment indicating control information associated with scheduling of the PSSCH; receiving sidelink control information (SCI) from the second wireless user equipment, wherein an SCI format of the SCI indicates the layer-1 source ID and the layer-1 destination ID; as well as At least one sidelink hybrid automatic repeat request (HARQ) feedback bit for PFSCH transmission is determined based on the at least one data packet received via the PSSCH.

18. The method of claim 13, wherein an initial value Cinit of the orthogonal sequence is determined based on the SLID value.

19. The method of claim 13, wherein the SFCI comprises SL Hybrid Automatic Repeat Request (HARQ) feedback information associated with the at least one data packet transmitted via the PSSCH.

20. The method of claim 14, wherein a sequence group u of the orthogonal sequences is determined based on the SLID value.

Images