Method and apparatus for determining NDI values ​​on SCI in NRV2X

Abstract

A method of operating a first device (100) in a wireless communication system is proposed. The method can comprise the steps of: receiving a configured grant from a base station (300); obtaining a first HARQ process identifier (ID) related to a first period of the configured grant; transmitting a first PSSCH to a second device (200) based on a first resource comprised in the first period; obtaining a second HARQ process ID related to a second period of the configured grant; and transmitting a second PSSCH to the second device (200) based on a second resource comprised in the second period.

Description

Technical Field

[0001] This disclosure relates to wireless communication systems. Background Technology

[0002] Sidelink (SL) communication is a communication scheme that establishes a direct link between user equipment (UE) and allows UEs to directly exchange voice and data without the intervention of evolved Node B (eNB). SL communication is being considered as a solution to the eNB overhead caused by the rapid growth of data traffic.

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

[0004] Furthermore, the increasing demand for larger communication capacity from various communication devices has led to a growing need for enhanced mobile broadband communications compared to traditional radio access technologies (RATs). Consequently, the design of communication systems for UEs or services sensitive to reliability and latency is under discussion. Next-generation radio access technologies based on enhanced mobile broadband communications, massive machine-type communications (MTC), and ultra-reliable low-latency communications (URLLC) can be termed novel RATs or NRs (new radio technologies). In this paper, NR can also support vehicle-to-everything (V2X) communications.

[0005] Figure 1 This is a diagram used to describe NR-based V2X communication compared to the RAT-based V2X communication previously used. Figure 1 The embodiments can be combined with various embodiments of this disclosure.

[0006] Regarding V2X communication, when discussing the RAT used prior to NR, the focus was on schemes that provided security services based on V2X messages such as BSM (Basic Security Message), CAM (Cooperation Awareness Message), and DENM (Distributed Environment Notification Message). V2X messages can include location information, dynamic information, attribute information, etc. For example, a UE can send periodic message type CAM and / or event-triggered message type DENM to another UE.

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

[0008] Subsequently, various V2X scenarios were proposed in NR regarding V2X communication. These scenarios could include vehicle platooning, advanced driver assistance, extended sensors, and remote driving.

[0009] For example, based on vehicle platooning, vehicles can be dynamically grouped and moved together. For instance, to perform platooning operations, vehicles belonging to a group can receive periodic data from the vehicle in front. For example, vehicles in the group can use periodic data to decrease or increase the distance between them.

[0010] For example, based on improved driving, vehicles can be semi-autonomous or fully autonomous. For instance, each vehicle can adjust its trajectory or maneuver based on data obtained from local sensors of neighboring vehicles and / or neighboring logical entities. Furthermore, for example, each vehicle can share driving intentions with adjacent vehicles.

[0011] For example, based on extended sensors, raw or processed data, or live video data acquired through local sensors, can be exchanged between vehicles, logical entities, pedestrian terminals, and / or V2X application servers. For instance, a vehicle can identify an improved environment compared to one that could be detected using its own sensors.

[0012] For example, based on remote driving, a remote driver or V2X application can operate or control a remote vehicle for a person who cannot drive or for a remote vehicle located in a hazardous environment. For instance, when routes can be predicted, such as in public transportation, cloud-based driving can be used to operate or control a remote vehicle. Furthermore, access to a cloud-based backend service platform for remote driving can be considered, for example.

[0013] Meanwhile, methods are being discussed in NR-based V2X communications to specify service requirements for various V2X scenarios, such as vehicle platooning, augmented driving, extended sensors, and remote driving. Summary of the Invention

[0014] Technical solution

[0015] According to an embodiment, a method for operating a first device 100 in a wireless communication system is proposed. The method may include: receiving a configuration grant from a base station; obtaining a first Hybrid Automatic Repeat Request (HARQ) process identifier ID associated with a first period of the configuration grant; sending a first Physical Side Link Shared Channel (PSSCH) to a second device based on a first resource included in the first period; obtaining a second HARQ process ID associated with a second period of the configuration grant; and sending a second PSSCH to the second device based on a second resource included in the second period.

[0016] Invention Effects

[0017] User equipment (UE) can efficiently perform SL communication. Attached Figure Description

[0018] Figure 1 This is a diagram used to describe NR-based V2X communication compared to RAT-based V2X communication used before NR.

[0019] Figure 2 The structure of an NR system based on an embodiment of this disclosure is shown.

[0020] Figure 3 A radio protocol architecture based on an embodiment of this disclosure is shown.

[0021] Figure 4 The structure of an NR radio frame based on an embodiment of this disclosure is shown.

[0022] Figure 5 The structure of a time slot for an NR frame based on an embodiment of this disclosure is shown.

[0023] Figure 6 An example of a BWP based on an embodiment of this disclosure is shown.

[0024] Figure 7 A UE performing V2X or SL communication based on an embodiment of this disclosure is shown.

[0025] Figure 8 The process of a UE performing V2X or SL communication based on a transport mode is illustrated according to an embodiment of this disclosure.

[0026] Figure 9 Three types of broadcasts based on embodiments of this disclosure are shown.

[0027] Figure 10 A method based on an embodiment of the present disclosure is illustrated, wherein a UE that has reserved transmission resources notifies another UE of the transmission resources.

[0028] Figure 11An example of toggling NDI values ​​according to an embodiment of this disclosure is shown.

[0029] Figure 12 The process of a first device performing wireless communication according to an embodiment of the present disclosure is illustrated.

[0030] Figure 13 The process of a second device performing wireless communication according to an embodiment of the present disclosure is illustrated.

[0031] Figure 14 A communication system 1 based on an embodiment of the present disclosure is shown.

[0032] Figure 15 A wireless device based on an embodiment of the present disclosure is shown.

[0033] Figure 16 A signal processing circuit for transmitting signals based on an embodiment of the present disclosure is shown.

[0034] Figure 17 Another example of a wireless device based on an embodiment of this disclosure is shown.

[0035] Figure 18 A handheld device based on an embodiment of the present disclosure is shown.

[0036] Figure 19 Vehicles or autonomous vehicles based on embodiments of this disclosure are shown. Detailed Implementation

[0037] In this disclosure, "A or B" may mean "A only", "B only", or "both A and B". In other words, in this disclosure, "A or B" can be interpreted as "A and / or B". For example, in this disclosure, "A, B or C" may mean "A only", "B only", "C only", or "any combination of A, B, and C".

[0038] The forward slash ( / ) or comma used in this disclosure can mean "and / or". For example, "A / B" can mean "A and / or B". Therefore, "A / B" can mean "A only", "B only", or "both A and B". For example, "A, B, C" can mean "A, B, or C".

[0039] In this disclosure, "at least one of A and B" may mean "only A", "only B" or "both A and B". Furthermore, in this disclosure, the expression "at least one of A or B" or "at least one of A and / or B" may be interpreted as "at least one of A and B".

[0040] Additionally, in this disclosure, "at least one of A, B, and C" may mean "A only", "B only", "C only" or "any combination of A, B, and C". Furthermore, "at least one of A, B, or C" or "at least one of A, B, and / or C" may mean "at least one of A, B, and C".

[0041] Additionally, the brackets used in this disclosure may mean "for example". Specifically, when indicated as "Control Message (PDCCH)", this may mean that "PDCCH" is cited as an example of "control message". In other words, "control message" in this disclosure is not limited to "PDCCH", and "PDCCH" may be cited as an example of "control message". Specifically, when indicated as "control message (i.e., PDCCH)", this may also mean that "PDCCH" is cited as an example of "control message".

[0042] The technical features described in one of the accompanying drawings in this disclosure can be implemented individually or simultaneously.

[0043] The technologies described below can be used in various wireless communication systems such as Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), and Single Carrier Frequency Division Multiple Access (SC-FDMA). CDMA can be implemented using radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA-2000. TDMA can be implemented using radio technologies such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rate GSM Evolution (EDGE). OFDMA can be implemented using radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, and Evolved UTRA (E-UTRA). IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with IEEE 802.16e-based systems. UTRA is part of the Universal Mobile Telecommunications System (UMTS). The 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of the Evolved UMTS (E-UMTS) using E-UTRA. 3GPP LTE uses OFDMA in the downlink and SC-FDMA in the uplink. LTE-Advanced (LTE-A) is an evolution of LTE.

[0044] 5G NR is a successor technology to LTE-A, corresponding to a new type of mobile communication system with high performance, low latency, and high availability. 5G NR can use all available spectrum resources, including low-frequency bands below 1 GHz, mid-frequency bands from 1 GHz to 10 GHz, and high-frequency bands above 24 GHz (millimeter waves).

[0045] For clarity, the following description will focus primarily on LTE-A or 5G NR. However, the technical features of the embodiments according to this disclosure are not limited thereto.

[0046] Figure 2 The structure of an NR system according to an embodiment of this disclosure is shown. Figure 2 The embodiments can be combined with various embodiments of this disclosure.

[0047] Reference Figure 2 The Next Generation Radio Access Network (NG-RAN) may include a BS 20 that provides user plane and control plane protocol termination to UE 10. For example, BS 20 may include a Next Generation Node B (gNB) and / or an Evolved Node B (eNB). For example, UE 10 may be fixed or mobile and may be referred to by other terms such as mobile station (MS), user terminal (UT), subscriber station (SS), mobile terminal (MT), radio equipment, etc. For example, BS may be referred to as a fixed station communicating with UE 10 and may be referred to by other terms such as base transceiver system (BTS), access point (AP), etc.

[0048] Figure 2 The embodiment illustrates a case involving only the gNB. BS 20 can interconnect via the Xn interface. BS 20 can interconnect via the fifth-generation (5G) core network (5GC) and the NG interface. More specifically, BS 20 can connect to the Access and Mobility Management Function (AMF) 30 via the NG-C interface and can connect to the User Plane Function (UPF) 30 via the NG-U interface.

[0049] The radio interface protocol layer between the UE and the network can be classified into Layer 1 (L1), Layer 2 (L2), and Layer 3 (L3) based on the well-known Open Systems Interconnection (OSI) model in communication systems. The Physical (PHY) layer, belonging to Layer 1, provides information transmission services using physical channels, while the Radio Resource Control (RRC) layer, located in Layer 3, controls the radio resources between the UE and the network. For this purpose, the RRC layer exchanges RRC messages between the UE and the BS layer.

[0050] Figure 3 A radio protocol architecture based on an embodiment of this disclosure is shown. Figure 3The embodiments described herein can be combined with various embodiments of this disclosure. Specifically, Figure 3 (a) shows the radio protocol stack for the user plane used for Uu communication, and Figure 3 (b) shows the radio protocol stack for the control plane used for Uu communication. Figure 3 (c) shows the radio protocol stack for the user plane used for SL communication, and Figure 3 (d) in the diagram shows the radio protocol stack for the control plane used for SL communication.

[0051] Reference Figure 3 The physical layer provides information transmission services to the upper layers through physical channels. The physical layer connects to the Media Access Control (MAC) layer, which is the upper layer, via transport channels. Data is transmitted between the MAC layer and the physical layer via transport channels. Transport channels are classified according to how data is transmitted through the radio interface and what characteristics of the data are transmitted.

[0052] Data is transmitted between different physical layers (i.e., the PHY layer of the transmitter and the PHY layer of the receiver) via a physical channel. The physical channel can be modulated using an orthogonal frequency division multiplexing (OFDM) scheme, and the physical channel uses time and frequency as radio resources.

[0053] The MAC layer provides services to the Radio Link Control (RLC) layer, which is a higher layer than the MAC layer, via logical channels. The MAC layer provides the ability to map multiple logical channels to multiple transport channels. The MAC layer also provides logical channel multiplexing by mapping multiple logical channels to a single transport channel. The MAC layer provides data delivery services through logical channels.

[0054] The RLC layer performs concatenation, segmentation, and reassembly of Radio Link Control Service Data Units (RLC SDUs). To ensure the different Quality of Service (QoS) required by the Radio Bearer (RB), the RLC layer provides three types of operating modes: Transparent Mode (TM), Non-Acknowledgment Mode (UM), and Acknowledgment Mode (AM). AM RLC provides error correction through Automatic Repeat Request (ARQ).

[0055] The Radio Resource Control (RRC) layer is defined only in the control plane. The RRC layer is used to control the configuration, reconfiguration, and release of logical, transport, and physical channels associated with RBs. RBs are logical paths for data delivery between the UE and the network, provided by Layer 1 (i.e., the Physical Layer or PHY Layer) and Layer 2 (i.e., the MAC Layer, RLC Layer, Packet Data Convergence Protocol (PDCP) Layer, and Serving Data Adaptation Protocol (SDAP) Layer).

[0056] The Packet Data Convergence Protocol (PDCP) in the user plane performs functions including user data delivery, header compression, and encryption. The Packet Data Convergence Protocol (PDCP) in the control plane performs functions including control plane data delivery and encryption / integrity protection.

[0057] The Service Data Adaptation Protocol (SDAP) layer is defined only in the user plane. The SDAP layer performs the mapping between Quality of Service (QoS) streams and Data Radio Bearers (DRBs), as well as the QoS Stream ID (QFI) tagging in both DL and UL packets.

[0058] The configuration of an Radio Bearer (RB) refers to the processing used to specify the radio protocol layer and channel attributes to provide specific services, as well as to determine the corresponding detailed parameters and operating methods. RBs can then be classified into two types: Signaling Radio Bearers (SRBs) and Data Radio Bearers (DRBs). SRBs are used as paths for transmitting RRC messages in the control plane, while DRBs are used as paths for transmitting user data in the user plane.

[0059] When an RRC connection is established between the UE's RRC layer and the E-UTRAN's RRC layer, the UE is in the RRC connected (RRC_CONNECTED) state; otherwise, the UE can be in the RRC idle (RRC_IDLE) state. In the NR case, an additional RRC inactive (RRC_INACTIVE) state is defined, and a UE in the RRC_INACTIVE state can maintain its connection with the core network while releasing its connection with the BS.

[0060] The downlink transport channels for sending (or transmitting) data from the network to the UE include the Broadcast Channel (BCH) for sending system information and the Shared Downlink Channel (SCH) for sending other user service or control messages. Service or control messages for downlink multicast or broadcast services can be sent via the downlink SCH or via a separate downlink multicast channel (MCH). Furthermore, the uplink transport channels for sending (or transmitting) data from the UE to the network include the Random Access Channel (RACH) for sending initial control messages and the Shared Uplink Channel (SCH) for sending other user service or control messages.

[0061] Examples of logical channels that belong to a higher layer than the transport channel and are mapped to the transport channel may include the Broadcast Control Channel (BCCH), Paging Control Channel (PCCH), Common Control Channel (CCCH), Multicast Control Channel (MCCH), Multicast Traffic Channel (MTCH), etc.

[0062] Figure 4 The structure of an NR radio frame according to an embodiment of this disclosure is shown. Figure 4The embodiments can be combined with various embodiments of this disclosure.

[0063] Reference Figure 4 In NR, radio frames can be used to perform uplink and downlink transmissions. A radio frame is 10 ms long and can be defined as consisting of two half-frames (HF). A half-frame can include five 1 ms subframes (SF). A subframe (SF) can be divided into one or more time slots, and the number of time slots within a subframe can be determined according to the subcarrier spacing (SCS). Each time slot can include 12 or 14 OFDM(A) symbols depending on the cyclic prefix (CP).

[0064] With normal CP, each time slot can include 14 symbols. With extended CP, each time slot can include 12 symbols. In this paper, symbols can include OFDM symbols (or CP-OFDM symbols) and single-carrier-FDMA (SC-FDMA) symbols (or Discrete Fourier Transform Extended OFDM (DFT-s-OFDM) symbols).

[0065] Table 1 below shows the number of symbols (N) per slot based on the SCS configuration (u) under normal CP conditions. slot symb ), Number of time slots per frame (N) frame,u slot ) and the number of time slots per subframe (N) subframe,u slot ).

[0066] [Table 1]

[0067] <![CDATA[SCS(15*2 u )]]> <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe,u slot ]]> 15kHz (u=0) 14 10 1 30kHz (u=1) 14 20 2 60kHz (u=2) 14 40 4 120kHz (u=3) 14 80 8 240kHz (u=4) 14 160 16

[0068] Table 2 shows examples of the number of symbols per slot, the number of slots per frame, and the number of slots per subframe, based on SCS, when using extended CP.

[0069] [Table 2]

[0070] <![CDATA[SCS(15*2 u )]]> <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe,u slot ]]> 60kHz (u=2) 12 40 4

[0071] In NR systems, the OFDM(A) parameter sets (e.g., SCS, CP length, etc.) of multiple cells integrated into a UE can be configured differently. Therefore, the (absolute time) duration (or interval) of time resources (e.g., subframes, slots, or TTIs) consisting of the same number of symbols (collectively referred to as time units (TUs) for simplicity) can be configured differently in the integrated cells.

[0072] In NR, multiple parameter sets or SCSs can be supported to support various 5G services. For example, with an SCS of 15kHz, a wide range of traditional cellular bands can be supported, while with an SCS of 30kHz / 60kHz, dense urban areas, lower latency, and wider carrier bandwidth can be supported. With an SCS of 60kHz or higher, bandwidths greater than 24.25GHz can be used to overcome phase noise.

[0073] NR bands can be defined as two different types of frequency ranges. These two different types of frequency ranges can be FR1 and FR2. The values ​​of the frequency ranges can be changed (or varied), for example, the two different types of frequency ranges can be as shown in Table 3 below. In the frequency ranges used in NR systems, FR1 can mean "the range below 6 GHz," and FR2 can mean "the range above 6 GHz," and can also be referred to as millimeter wave (mmW).

[0074] [Table 3]

[0075] Frequency range specification Corresponding frequency range Subcarrier spacing (SCS) FR1 450MHz–6000MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

[0076] As mentioned above, the frequency range values ​​in an NR system can be changed (or varied). For example, as shown in Table 4 below, FR1 can include a bandwidth ranging from 410 MHz to 7125 MHz. More specifically, FR1 can include frequency bands of 6 GHz (or 5850, 5900, 5925 MHz, etc.) and higher. For example, the frequency bands of 6 GHz (or 5850, 5900, 5925 MHz, etc.) and higher included in FR1 can include unlicensed frequency bands. Unlicensed frequency bands can be used for various purposes; for example, unlicensed frequency bands can be used for vehicle-specific communications (e.g., autonomous driving).

[0077] [Table 4]

[0078] Frequency range specification Corresponding frequency range Subcarrier spacing (SCS) FR1 410MHz–7125MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

[0079] Figure 5 The structure of a time slot for an NR frame according to an embodiment of this disclosure is shown. Figure 5 The embodiments can be combined with various embodiments of this disclosure.

[0080] Reference Figure 5 A time slot comprises multiple symbols in the time domain. For example, in normal CP, a time slot may include 14 symbols. In extended CP, a time slot may include 12 symbols. Alternatively, in normal CP, a time slot may include 7 symbols. However, in extended CP, a time slot may include 6 symbols.

[0081] A carrier comprises multiple subcarriers in the frequency domain. A resource block (RB) can be defined as multiple consecutive subcarriers in the frequency domain (e.g., 12 subcarriers). A bandwidth portion (BWP) can be defined as multiple consecutive (physical) resource blocks ((P)RBs) in the frequency domain, and a BWP can correspond to a set of parameters (e.g., SCS, CP length, etc.). A carrier can include up to N BWPs (e.g., 5 BWPs). Data communication can be performed via active BWPs. Each element can be referred to as a resource element (RE) in the resource grid, and a complex symbol can be mapped to each element.

[0082] The bandwidth portion (BWP) and carrier will be described in detail below.

[0083] A BWP can be a contiguous set of Physical Resource Blocks (PRBs) within a given set of parameters. A PRB can be a contiguous set of Common Resource Blocks (CRBs) for a given set of parameters on a given carrier.

[0084] For example, a BWP can be at least one of an active BWP, an initial BWP, and / or a default BWP. For example, a UE may not monitor downlink radio link quality in DL BWPs other than the active DL BWP on the primary cell (PCell). For example, a UE may not receive PDCCH, Physical Downlink Shared Channel (PDSCH), or Channel State Information-Reference Signal (CSI-RS) (excluding RRM) other than the active DL BWP. For example, a UE may not trigger Channel State Information (CSI) reports for inactive DL BWPs. For example, a UE may not transmit Physical Uplink Control Channel (PUCCH) or Physical Uplink Shared Channel (PUSCH) other than the active UL BWP. For example, in the downlink case, the initial BWP can be given as a continuous set of RBs (configured by the Physical Broadcast Channel (PBCH)) for the Remaining Minimal System Information (RMSI) Control Resource Set (CORESET). For example, in the uplink case, the initial BWP can be given by the System Information Block (SIB) for the random access procedure. For example, a default BWP can be configured by a higher layer. For example, the initial value of the default BWP can be the initial DL BWP. To save energy, if the UE cannot detect downlink control information (DCI) during a specified period, the UE can switch its active BWP to the default BWP.

[0085] Furthermore, a BWP can be defined for an SL. The same SL BWP can be used for both transmission and reception. For example, a transmitting UE can transmit an SL channel or SL signal on a specific BWP, and a receiving UE can receive an SL channel or SL signal on a specific BWP. In a licensed carrier, the SL BWP can be defined separately from the Uu BWP, and the SL BWP can have separate configuration signaling from the Uu BWP. For example, a UE can receive configuration for an SL BWP from the BS / network. For example, a UE can receive configuration for a Uu BWP from the BS / network. SLBWPs are (pre-)configured on the carrier for NR V2X UEs outside coverage and RRC_IDLE UEs. For UEs in RRC_CONNECTED mode, at least one SL BWP can be activated on the carrier.

[0086] Figure 6 An example of a BWP according to an embodiment of this disclosure is shown. Figure 6 The embodiments can be combined with various embodiments of this disclosure. It is assumed that in... Figure 6 In this embodiment, the number of BWPs is 3.

[0087] Reference Figure 6 A Common Resource Block (CRB) can be a carrier resource block numbered from one end of a carrier frequency band to the other. Alternatively, a Producer Resource Block (PRB) can be a resource block numbered within each BWP. Point A can indicate a common reference point for the resource block grid.

[0088] It can be determined by point A and the offset (N) relative to point A. start BWP ) and bandwidth (N size BWP To configure the BWP, point A can be an external reference point for the PRB of a carrier, with subcarrier 0 of all parameter sets (e.g., all parameter sets supported by the network on the corresponding carrier) aligned at point A. For example, offset can be the PRB distance between the lowest subcarrier in a given parameter set and point A. For example, bandwidth can be the number of PRBs in a given parameter set.

[0089] The following text will describe V2X or SL communication.

[0090] Sidelink synchronization signals (SLSS) can include a primary sidelink synchronization signal (PSSS) and a secondary sidelink synchronization signal (SSSS) as SL-specific sequences. The PSSS can be referred to as the primary sidelink synchronization signal (S-PSS), and the SSSS can be referred to as the secondary sidelink synchronization signal (S-SSS). For example, a 127-character M-sequence can be used for the S-PSS, and a 127-character Gold sequence can be used for the S-SSS. For example, a UE can use the S-PSS for initial signal detection and synchronization acquisition. For example, a UE can use both the S-PSS and S-SSS for detailed synchronization acquisition and for detecting the synchronization signal ID.

[0091] The Physical Sidelink Broadcast Channel (PSBCH) can be a (broadcast) channel used to transmit default (system) information that the UE must know before SL signal transmission / reception. For example, the default information could be related to SLSS, duplex mode (DM), Time Division Duplex (TDD) uplink / downlink (UL / DL) configuration, resource pool information, and application types related to SLSS, subframe offset, and broadcast information. For instance, to evaluate PSBCH performance in NR V2X, the PSBCH payload size can be 56 bits, including 24 bits of Cyclic Redundancy Check (CRC).

[0092] S-PSS, S-SSS, and PSBCH can be included in a block format that supports periodic transmission (e.g., SL synchronization signal (SS) / PSBCH block, hereinafter, sidelink synchronization signal block (S-SSB)). The S-SSB can have the same parameter set (i.e., SCS and CP lengths) as the Physical Sidelink Control Channel (PSCCH) / Physical Sidelink Shared Channel (PSSCH) in the carrier, and the transmission bandwidth can exist within a (pre-)configured sidelink (SL) BWP. For example, the S-SSB can have a bandwidth of 11 resource blocks (SBs). For example, the PSBCH can exist across 11 RBs. Additionally, the frequency location of the S-SSB can be (pre-)configured. Therefore, the UE does not need to perform hypothesis detection at the frequency to discover the S-SSB in the carrier.

[0093] Figure 7 A UE performing V2X or SL communication according to an embodiment of this disclosure is shown. Figure 7 The embodiments can be combined with various embodiments of this disclosure.

[0094] Reference Figure 7In V2X or SL communication, the term "UE" can generally refer to a user's UE. However, if a network device such as a BS transmits / receives signals according to a communication scheme between UEs, then the BS can also be considered a UE. For example, UE 1 can be a first device 100, and UE 2 can be a second device 200.

[0095] For example, UE 1 can select a resource element corresponding to a specific resource from a resource pool that represents a set of resource families. Additionally, UE 1 can transmit SL signals using resource elements. For instance, the resource pool in which UE 1 can transmit signals can be configured for UE 2, acting as a receiving UE, and UE 1's signals can be detected within that resource pool.

[0096] In this document, if UE 1 is within the connection range of the BS, the BS can inform UE 1 of the resource pool. Otherwise, if UE 1 is outside the connection range of the BS, another UE can inform UE 1 of the resource pool, or UE 1 can use a pre-configured resource pool.

[0097] Typically, resource pools can be configured in units of multiple resources, and each UE can select one or more units of resources to use in its SL signal transmission.

[0098] The following section describes resource allocation in SL.

[0099] Figure 8 The process of a UE performing V2X or SL communication based on a transmission mode according to an embodiment of this disclosure is illustrated. Figure 8 The embodiments described herein can be combined with various embodiments of this disclosure. In various embodiments of this disclosure, the transmission mode may be referred to as a mode or resource allocation mode. Hereinafter, for ease of explanation, in LTE, the transmission mode may be referred to as an LTE transmission mode. In NR, the transmission mode may be referred to as an NR resource allocation mode.

[0100] For example, Figure 8 (a) illustrates UE operation associated with LTE transmission mode 1 or LTE transmission mode 3. Alternatively, for example, Figure 8 (a) illustrates UE operations associated with NR resource allocation mode 1. For example, LTE transmission mode 1 can be applied to regular SL communication, and LTE transmission mode 3 can be applied to V2X communication.

[0101] For example, Figure 8 (b) illustrates UE operation associated with LTE transmission mode 2 or LTE transmission mode 4. Alternatively, for example, Figure 8 (b) shows the UE operation associated with NR resource allocation mode 2.

[0102] Reference Figure 8 In (a) of this document, in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, the BS can schedule SL resources for the UE to use for SL transmission. For example, the BS can perform resource scheduling for UE 1 via PDCCH (e.g., Downlink Control Information (DCI)) or RRC signaling (e.g., Configuration License Type 1 or Configuration License Type 2), and UE 1 can perform V2X or SL communication against UE 2 based on the resource scheduling. For example, UE 1 can send Sidelink Control Information (SCI) to UE 2 via the Physical Sidelink Control Channel (PSCCH), and subsequently send SCI-based data to UE 2 via the Physical Sidelink Shared Channel (PSSCH).

[0103] Reference Figure 8 In (b) of this document, under LTE transmission mode 2, LTE transmission mode 4, or NR resource allocation mode 2, the UE can determine the SL transmission resource within the SL resources configured by the BS / network or the pre-configured SL resources. For example, the configured SL resources or the pre-configured SL resources can be a resource pool. For example, the UE can autonomously select or schedule resources for SL transmission. For example, the UE can perform SL communication by autonomously selecting resources from the configured resource pool. For example, the UE can autonomously select resources within a selection window by performing a sensing and resource (re)selection process. For example, sensing can be performed on a sub-channel basis. Furthermore, UE 1, which has autonomously selected resources from the resource pool, can send SCI to UE 2 via PSCCH, and subsequently send SCI-based data to UE 2 via PSSCH.

[0104] Figure 9 Three broadcast types according to embodiments of this disclosure are shown. Figure 9 The embodiments can be combined with various embodiments of this disclosure. Specifically, Figure 9 (a) in the diagram illustrates broadcast SL communication. Figure 9 (b) shows unicast SL communication, and Figure 9 (c) illustrates multicast SL communication. In the case of unicast SL communication, a UE can perform one-to-one communication with another UE. In the case of multicast SL transmission, a UE can perform SL communication with one or more UEs in a group to which it belongs. In various embodiments of this disclosure, SL multicast communication can be replaced by SL multicast communication, SL one-to-many communication, etc.

[0105] Furthermore, in various embodiments of this disclosure, the transmitting UE (i.e., TX UE) can be a UE that transmits data to the (target) receiving UE (i.e., RX UE). For example, the TX UE can be a UE that performs PSCCH transmission and / or PSSCH transmission. For example, the TX UE can be a UE that sends SL CSI-RS and / or SL CSI report request indications to the (target) RX UE. For example, the TX UE can be a UE that sends (predefined) reference signals (e.g., PSSCH demodulation reference signals (DM-RS)) and / or SL (L1) RSRP report request indications to the (target) RX UE for SL (L1) RSRP measurement. For example, the TX UE can be a UE that transmits (control) channels (e.g., PSCCH, PSSCH, etc.) and / or reference signals (e.g., DM-RS, CSI-RS, etc.) through the (control) channels for the (target) RX UE's SL radio link monitoring (RLM) operation and / or SL radio link failure (RLF) operation.

[0106] Furthermore, in various embodiments of this disclosure, the receiving UE (i.e., the RX UE) may be a UE that sends SL HARQ feedback to the sending UE (i.e., the TX UE) based on whether the data sent by the TX UE has been successfully decoded and / or whether the PSCCH (related to PSSCH scheduling) sent by the TX UE has been successfully detected / decoded. For example, the RX UE may be a UE that performs SL CSI transmission to the TX UE based on the SLCSI-RS and / or SL CSI report request indication received from the TX UE. For example, the RX UE may be a UE that sends SL(L1)RSRP measurements to the TX UE based on (predefined) reference signals and / or SL(L1)RSRP report request indications received from the TX UE. For example, the RX UE may be a UE that sends its own data to the TX UE. For example, the RX UE may be a UE that performs SL RLM and / or SL RLF operations based on (preconfigured) (control) channels received from the TX UE and / or reference signals via the (control) channels.

[0107] Meanwhile, in various embodiments of this disclosure, when the receiving UE sends SL HARQ feedback information for the PSSCH and / or PSCCH received from the sending UE, the following methods can be considered or partially considered. Here, for example, the corresponding scheme or some schemes can be applied restrictively only when the receiving UE successfully decodes / detects the PSCCH used for scheduling the PSSCH.

[0108] - Option 1: Send NACK only if PSSCH decoding / reception fails.

[0109] Option 2: Send an ACK message when PSSCH decoding / reception is successful, or send a NACK message when it fails.

[0110] Furthermore, in various embodiments of this disclosure, for example, the TX UE can send at least one of the following information to the RX UE via the SCI. Here, for example, the TX UE can send at least one of the following information to the RX UE via a first SCI and / or a second SCI.

[0111] Resource allocation information related to PSSCH (and / or PSCCH) (e.g., location / quantity of time / frequency resources, resource reservation information (e.g., period)).

[0112] -SL CSI Report Request Indicator or SL(L1)RSRP (and / or SL(L1)RSRQ and / or SL(L1)RSSI) Report Request Indicator

[0113] -(on PSSCH)SL CSI transmission indicator (or SL(L1)RSRP (and / or SL(L1)RSRQ and / or SL(L1)RSSI) information transmission indicator)

[0114] Modulation and coding scheme (MCS) information

[0115] -Transmission power information

[0116] -L1 Destination ID information and / or L1 Source ID information

[0117] -SL HARQ process ID information

[0118] - New Data Indicator (NDI) information

[0119] -Redundant Version (RV) Information

[0120] - QoS information (e.g., priority information) related to transmission services / packets

[0121] -SL CSI-RS transmission indicator or (transmitted) SL CSI-RS antenna port quantity information

[0122] - TX UE location information or target RX UE location (or distance area) information (where SL HARQ feedback is required).

[0123] - Information regarding the decoding of data transmitted via PSSCH and / or reference signals (e.g., DM-RS, etc.) related to channel estimation. For example, information regarding reference signals could be information related to the pattern of the (time-frequency) mapping resources of the DM-RS, RANK information, antenna port index information, etc.

[0124] Furthermore, in various embodiments of this disclosure, for example, the PSCCH can be replaced / substituted with at least one of the SCI, the first SCI (first-stage SCI), and / or the second SCI (second-stage SCI), and vice versa. For example, the SCI can be replaced / substituted with at least one of the PSCCH, the first SCI, and / or the second SCI, and vice versa. For example, the PSSCH can be replaced / substituted with the second SCI and / or the PSCCH, and vice versa, because the transmitting UE can send the second SCI to the receiving UE via the PSSCH. For example, if the SCI configuration fields are divided into two groups considering the (relatively) high SCI payload size, the SCI including the first SCI configuration field group can be referred to as the first SCI or the first (1) st SCI, and an SCI that includes the second SCI configuration field group can be referred to as the second SCI or the second (2) nd SCI. For example, the first SCI and the second SCI can be transmitted through different channels. For example, the transmitting UE can transmit the first SCI to the receiving UE via PSCCH. For example, the second SCI can be transmitted to the receiving UE via (separate) PSCCH, or it can be transmitted along with data via PSSCH.

[0125] On the other hand, in various embodiments of this disclosure, for example, "configuration" or "definition" can refer to (resource pool-specific) (pre)configuration from a base station or network (via predefined signaling (e.g., SIB, MAC, RRC, etc.)). For example, "A is configured" can mean "the base station / network sends information related to A to the UE". Or, for example, "A is configured" can mean "A is specified via predefined signaling (e.g., PC5 RRC) between UEs".

[0126] Furthermore, in various embodiments of this disclosure, for example, "RLF" can be interpreted as mutually extending to at least one of out-of-synchronization (OOS) and synchronous (IS). Also, in various embodiments of this disclosure, for example, a resource block (RB) can be replaced / substituted with a subcarrier, and vice versa. For example, packets or traffic can be replaced / substituted with a transport block (TB) or a media access control protocol data unit (MAC PDU) according to the transport layer, and vice versa. For example, a code block group (CBG) can be replaced / substituted with a TB, and vice versa. For example, a source ID can be replaced / substituted with a destination ID, and vice versa. For example, an L1 ID can be replaced / substituted with an L2 ID, and vice versa. For example, an L1 ID can be an L1 source ID or an L1 destination ID. For example, an L2 ID can be an L2 source ID or an L2 destination ID.

[0127] Meanwhile, in various embodiments of this disclosure, for example, the operation of reserving / selecting / determining retransmission resources by the TX UE may include the operation of reserving / selecting / determining potential retransmission resources by the TX UE, wherein the determination of whether to actually use them is based on SL HARQ feedback information received from the RX UE.

[0128] Furthermore, in various embodiments of this disclosure, a sub-selection window can be replaced / alternate with a selection window and / or a pre-configured set of resources within the selection window, and vice versa.

[0129] Meanwhile, in various embodiments of this disclosure, SL mode 1 can refer to a resource allocation method or communication method, wherein the base station directly schedules SL transmission resources for the TX UE through predefined signaling (e.g., DCI or RRC messages). For example, SL mode 2 can refer to a resource allocation method or communication method, wherein the UE independently selects SL transmission resources from a resource pool pre-configured or configured by the base station or network. For example, a UE performing SL communication based on SL mode 1 can be referred to as a mode 1 UE or a mode 1 TX UE, and a UE performing SL communication based on SL mode 2 can be referred to as a mode 2 UE or a mode 2 TX UE.

[0130] Furthermore, in this disclosure, for example, a Dynamic Grant (DG) can be replaced / alternated with a Configuration Grant (CG) and / or a Semi-Persistent Scheduling (SPS) grant, and vice versa. For example, a DG can be replaced / alternated with a combination of CG and SPS grants, and vice versa. For example, a CG can include at least one of Configuration Grant (CG) Type 1 and / or Configuration Grant (CG) Type 2. For example, in CG Type 1, the grant can be provided by RRC signaling and can be stored as a configuration grant. For example, in CG Type 2, the grant can be provided by PDCCH and can be stored or deleted as a configuration grant based on L1 signaling indicating activation or deactivation of the grant. For example, in CG Type 1, the base station can allocate periodic resources to the TX UE via RRC messages. For example, in CG Type 2, the base station can allocate periodic resources to the TX UE via RRC messages, and the base station can dynamically activate or deactivate periodic resources via DCI.

[0131] Furthermore, in various embodiments of this disclosure, a channel can be replaced / alternate with a signal, and vice versa. For example, transmitting / receiving a channel may include transmitting / receiving a signal. For example, transmitting / receiving a signal may include transmitting / receiving a channel. For example, broadcasting may be replaced / alternate with at least one of unicast, multicast, and / or broadcast, and vice versa. For example, the broadcast type may be replaced / alternate with at least one of unicast, multicast, and / or broadcast, and vice versa.

[0132] Furthermore, in various embodiments of this disclosure, resources can be replaced / substituted with time slots or symbols, and vice versa. For example, resources may include time slots and / or symbols.

[0133] Furthermore, in various embodiments of this disclosure, priority can be replaced / substituted with at least one of Logical Channel Priority (LCP), latency, reliability, minimum required communication range, ProSe Per Packet Priority (PPPP), Side Link Radio Bearer (SLRB), QoS profile, QoS parameters and / or requirements, or vice versa.

[0134] Meanwhile, in various embodiments of this disclosure, for example, for ease of description, the (physical) channel used when the RX UE sends at least one of the following information to the TX UE may be referred to as PSFCH.

[0135] -SL HARQ feedback, SL CSI, SL(L1)RSRP

[0136] Meanwhile, when performing sidelink communication, the method for sending transmission resources reserved or predetermined by the UE for receiving the UE can be represented as follows.

[0137] For example, the transmitting UE can perform the reservation of transmission resources based on chains. Specifically, for example, if the transmitting UE reserves K transmission resources, the transmitting UE can send location information for fewer than K transmission resources to the receiving UE via an SCI sent to the receiving UE at any (or specific) transmission time or time resource. That is, for example, the SCI can include location information for fewer than K transmission resources. Alternatively, for example, if the transmitting UE reserves K transmission resources associated with a specific TB, the transmitting UE can send location information for fewer than K transmission resources to the receiving UE via an SCI sent to the receiving UE at any (or specific) transmission time or time resource. That is, the SCI can include location information for fewer than K transmission resources. In this case, for example, by signaling the location information for fewer than K transmission resources to the receiving UE only via an SCI sent by the transmitting UE at any (or specific) transmission time or time resource, performance degradation due to excessive increase in the SCI payload can be prevented.

[0138] Figure 10 A method based on an embodiment of the present disclosure is illustrated, wherein a UE that has reserved transmission resources notifies another UE of the transmission resources. Figure 10 The embodiments can be combined with various embodiments of this disclosure.

[0139] Specifically, for example, Figure 10(a) illustrates a chain-based resource reservation method performed by the transmitting UE when K = 4, by notifying the receiving UE of the location information of up to two transmission resources via a single SCI. For example, Figure 10 (b) illustrates a chain-based resource reservation method performed by the transmitting UE when K = 4, by notifying the receiving UE of the location information of up to 3 transmission resources via an SCI. For example, see Reference Figure 10 In (a) and (b), the transmitting UE can send / signal the location information of the fourth transmission-related resources only to the receiving UE via the fourth (or last) transmission-related PSCCH. For example, refer to Figure 10 (a) The transmitting UE can, through the fourth (or last) transmission-related PSCCH, not only send / signal the location information of the fourth transmission-related resources to the receiving UE, but also send / signal the location information of the third transmission-related resources to the receiving UE. For example, refer to Figure 10 (b) The transmitting UE can use the fourth (or last) transmission-related PSCCH to not only send / signal the location information of the fourth transmission-related resource to the receiving UE, but also send / signal the location information of the second and third transmission-related resources to the receiving UE. In this case, for example, in Figure 10 In (a) and (b), if the transmitting UE can send / signalize the location information of the fourth transmission-related resources to the receiving UE only through the fourth (or last) transmission-related PSCCH, then the transmitting UE can configure or specify the field / bit of the location information of unused or remaining transmission resources to a pre-configured value (e.g., 0). For example, in Figure 10 In (a) and (b), if the sending UE can send / signal the location information of the fourth transmission-related resources to the receiving UE only through the fourth (or last) transmission-related PSCCH, then the sending UE can be configured or specified that the field / bit of the location information of the unused or remaining transmission resources is a pre-configured status / bit value indicating / representing the last transmission (out of 4 transmissions).

[0140] Simultaneously, for example, the transmitting UE can perform the reservation of transmission resources on a block-by-block basis. Specifically, for example, if the transmitting UE reserves K transmission resources, the transmitting UE can send location information for the K transmission resources to the receiving UE through an SCI sent to the receiving UE at any (or specific) transmission time or time resource. That is, the SCI can include location information for the K transmission resources. For example, if the transmitting UE reserves K transmission resources associated with a specific TB, the transmitting UE can send the location information for the K transmission resources to the receiving UE through an SCI sent to the receiving UE at any (or specific) transmission time or time resource. That is, the SCI can include location information for the K transmission resources. For example, Figure 10 (c) shows a method for block-based resource reservation performed by the sending UE when the value of K = 4, by signaling the location information of the four transmission resources to the receiving UE via an SCI.

[0141] According to embodiments of this disclosure, when a Mode 1 UE performs a TB transmission using SL resources within a specific CG period, and / or when it performs a TB transmission using SL retransmission resources additionally allocated via Mode 1 DG downlink control information (DCI) linked to the SL resources within the specific CG period, whether to switch the New Data Indicator (NDI) on the SCI associated with the TB transmission can be configured to be determined according to (a portion of) the following rules. For example, the TB transmission can be an initial transmission or a retransmission. And, for example, whether to specify an NDI value and / or specify / change the SLHARQ process ID can be determined according to (a portion of) the following rules. For example, in this disclosure, the SL HARQ process ID can refer to the SL process ID.

[0142] According to embodiments of this disclosure, when the CG period changes, the NDI value on the TB-related SCI transmitted via the (changed) "SL resource interlocked with the CG period (REL_CGRSC)" can be switched. For example, (Option 1-A) switching the NDI value can be compared to the NDI value on the REL_CGRSC-related SCI of the previous CG period. Or, for example, (Option 1-B) switching the NDI value can be compared to the NDI value on the most recent REL_CGRSC-related SCI that performed the actual TB transmission. For example, in this disclosure, "REL_CGRSC" can be (limitedly) interpreted as the CG resource configured within the CG period and / or the SL retransmission resource additionally allocated via a Mode 1DG DCI linked to the CG resource configured within the CG period. For example, in this disclosure, only one TB transmission via REL_CGRSC is possible; additionally, it can be assumed that different TB transmissions are performed between different REL_CGRSCs. For example, in Option 1-A (and / or Option 1-B) above, the change in the pre-configured number of CG cycles can be interpreted as a factor used to switch the NDI value on the SCI. For example, when applying the rules of Option 1-A and / or Option 1-B above, if different TB transfers are performed using REL_CGRSCs with different HARQ process IDs (HPN_DCI), the SL HARQ process IDs (HPN_SCI) specified on the REL_CGRSC-related SCIs of different HPN_DCIs can be mapped / specified differently (e.g., one-to-one mapping). For example, the HARQ process ID can be derived through a predefined formula. For example, the predefined formula may include Equation 1 below.

[0143] [Equation 1]

[0144] HARQ process ID=[floor(CURRENT_slot / sl-PeriodCG)]modulo sl-NrOfHARQ-Processes+sl-HARQ-ProcID-offset

[0145] For example, HPN_DCI can be used to indicate the link between CG resources configured during the CG cycle and SL retransmission resources allocated via Mode 1DG DCI. HPN_DCI can be signaled via predefined fields on Mode 1DG DCI, for example.

[0146] According to embodiments of this disclosure, the NDI values ​​on different TB-related SCIs sent via REL_CGRSC associated with different CG periods can be determined differently based on a mapping method between "REL_CGRSC related HPN_DCI" and "HPN_SCI on TB-related SCIs sent using (corresponding) REL_CGRSC". For example, whether to switch the NDI values ​​on different TB-related SCIs can also be determined differently based on the mapping method between HPN_DCI and HPN_SCI. For example, the NDI values ​​on different TB-related SCIs sent via REL_CGRSCs mapped to different HPN_DCIs with the same HPN_SCI value can be configured to be switched. For example, the NDI values ​​on different TB-related SCIs sent via REL_CGRSCs mapped to different HPN_DCIs with different HPN_SCI values ​​can be either not configured to be switched or can be configured not to be switched. For example, the rule for determining the NDI value on different TB-related SCIs based on the mapping method described above between HPN_DCI and HPN_SCI can be applied restrictively only when the PUCCH resource is not configured (or is configured) for mode 1CG resources. For example, the PUCCH resource can be used for the purpose of requesting additional retransmission resources. For example, when the same HPN_SCI value is mapped to multiple REL_CGRSCs with different HPN_DCIs, the UE may not want to configure the PUCCH resource associated with the mode 1CG resource.

[0147] According to embodiments of this disclosure, depending on whether the PUCCH resource is configured for mode 1CG resources, the mapping method between allowed "REL_CGRSC related HPN_DCI" and "HPN_SCI on TB related SCI sent using (corresponding) REL_CGRSC" can be configured differently. Here, for example, when the PUCCH resource is configured, HPN_SCI specified on REL_CGRSC related SCIs of different HPN_DCIs can be mapped / specified differently (e.g., one-to-one mapping). On the other hand, for example, if the PUCCH resource is not configured, the same value of HPN_SCI can be mapped / specified on REL_CGRSC related SCIs of different HPN_DCIs (e.g., many-to-one mapping).

[0148] According to embodiments of this disclosure, all NDI values ​​on the relevant SCI can be configured to have the same switching state (and / or value) until the recurrence of the REL_CGRSC for HPN_DCI#X, for example, from the REL_CGRSC associated with the CG cycle of HPN_DCI#X to the REL_CGRSC associated with the CG cycle of HPN_DCI#(X+HPNDCI_NUM-1). Here, for example, X can be a pre-configured value (e.g., 0). For example, the NDI value on the relevant SCI can be switched (relative to the previous) from the REL_CGRSC associated with the CG cycle of HPN_DCI#X that recurred after the CG cycle of HPN_DCI#(X+HPNDCI_NUM-1) to the REL_CGRSC for the CG cycle of HPN_DCI#(X+HPNDCI_NUM-1). Here, for example, "HPNDCI_NUM" can represent the (maximum) number of (SL)HARQ process (ID) configured for mode 1 CG resources. For example, the (maximum) number of (SL)HARQ processes (ID) can represent the (maximum) number of HPN_SCI or HPN_DCI.

[0149] Figure 11 An example of switching NDI values ​​according to an embodiment of this disclosure is shown. Figure 11 The embodiments can be combined with various embodiments of this disclosure.

[0150] refer to Figure 11 In the first CG cycle, HPN_DCI can be HPN_DCI#A. For example, in the first CG cycle, the HPN_SCI associated with REL_CGRSC for HPN_DCI#A can be HPN_SCI#a. For example, in Figure 11 In this context, HPN_DCI and HPN_SCI can have a one-to-one mapping relationship in each CG cycle. For example, the NDI value on the SCI related to REL_CGRSC for HPN_DCI#A in the first CG cycle can be 0 or 1. For example, HPN_DCI#A can be determined based on the first resource among the three resources included in REL_CGRSC in the first CG cycle. For example, the first TB can be initially transmitted to the receiving UE based on one of the three resources included in REL_CGRSC in the first CG cycle.

[0151] For example, with in Figure 11In the first CG cycle, the HPN_DCI related to the retransmission of the first TB and the DG resource based on DCI can be HPN_DCI#A. Furthermore, the HPN_SCI related to the DG resource can be HPN_SCI#a. That is, even if the CG cycle changes, the HPN_DCI and HPN_SCI related to the resource associated with the retransmission of the first TB can remain the same. For example, the HPN_DCI related to the DG resource can be indicated by DCI. And, for example, the NDI value on the SCI related to the retransmission of the first TB can be the same as the NDI value on the SCI related to the initial transmission. That is, for example, since the NDI value on the REL_CGRSC related SCI of HPN_DCI#A in the first CG cycle is 0 or 1, therefore... Figure 11 The NDI value on the SCI associated with the retransmission of the first TB of the initial transmission can be: 0 if the NDI value on the SCI associated with REL_CGRSC of HPN_DCI#A is 0; or 1 if the NDI value on the SCI associated with REL_CGRSC of HPN_DCI#A is 1.

[0152] For example, in Figure 11 In the second and / or fourth CG cycles, the HPN_DCI can be determined based on the first of the three resources included in each REL_CGRSC. For example, the HPN_DCI in the second CG cycle can be HPN_DCI#B, and the HPN_DCI in the fourth CG cycle can be HPN_DCI#X. Furthermore, the REL_CGRSC-related HPN_SCI for each of HPN_DCI#B and HPN_DCI#X can be HPN_SCI#b and HPN_SCI#x, respectively, and as mentioned above, HPN_SCI#b and HPN_SCI#x can have a one-to-one mapping relationship with HPN_DCI#B and HPN_DCI#X, respectively.

[0153] For example, in Figure 11In the fifth CG cycle, the HPN_DCI determined based on the first resource among the three resources included in REL_CGRSC is HPN_DCI#A, which can be equal to the HPN_DCI#A associated with the first CG cycle. For example, in this case, due to the one-to-one mapping relationship, the HPN_SCI associated with HPN_DCI#A in the fifth CG cycle can be HPN_SCI#a. In this case, for example, the retransmission of the first TB initially transmitted in the first CG cycle cannot be performed. In the fifth CG cycle, the second TB can be initially transmitted. Here, when the initial transmission of the second TB is sent to the same receiving UE that received the first TB, the NDI value on the SCI associated with the second TB can be a value switched from the NDI value on the SCI associated with the retransmission of the first TB. For example, when the NDI value on the SCI associated with the retransmission of the first TB is 0, the NDI value on the SCI associated with the second TB can be 1, or when the NDI value on the SCI associated with the retransmission of the first TB is 1, the NDI value on the SCI associated with the second TB can be 0.

[0154] According to embodiments of this disclosure, when a REL_CGRSC with the same HPN_DCI#Y reappears, the NDI value on the SCI associated with the REL_CGRSC with HPN_DCI#Y can be switched (compared to the previous one). Here, for example, the NDI value can be switched (compared to the previous one) when the REL_CGRSC with the same HPN_DCI#Y reappears a pre-configured number of times. For example, rules related to the reappearance of the REL_CGRSC with HPN_DCI#Y can be applied / operated independently for each REL_CGRSC with different HPN_DCIs.

[0155] According to embodiments of this disclosure, when a (pre-configured) timer value associated with HPN_DCI#Z expires, the NDI value on the SCI associated with REL_CGRSC of HPN_DCI#Z can be switched (compared to the previous one). Here, for example, the timer value of HPN_DCI#Z can represent the time the UE can expect for DG DCI reception to allocate additional retransmission resources associated with HPN_DCI#Z from the base station. Furthermore, for example, when the timer value associated with HPN_DCI#Z expires, a new transport block (TB) transmission can be performed (compared to the previous one) via the REL_CGRSC associated with HPN_DCI#Z. For example, when performing a new TB transmission, the UE can perform the new TB transmission after refreshing the buffer / MAC PDU associated with HPN_DCI#Z.

[0156] According to embodiments of this disclosure, when a TB transmission is performed via REL_CGRSC associated with a specific CG cycle, the UE can determine whether to switch the NDI, the NDI value, the HPN_SCI value, and / or the L1 ID (e.g., source / destination ID) on the relevant SCI.

[0157] According to embodiments of this disclosure, when a Mode 1 UE performs a TB transmission via REL_CGRSC associated with a specific CG cycle, it can determine whether to switch the NDI, the specification of the NDI value, and / or the specification of the HPN_SCI value on the relevant SCI according to a portion of the following rules.

[0158] For example, when a TX UE performs different TB transmissions relative to the same target RX UE (and / or an RX UE associated with the same session, and / or an RX UE associated with the same broadcast type) using different CG period-related REL_CGRSCs (and / / when a TX UE performs different TB transmissions via different CG period-related REL_CGRSCs using the same L1 (or L2) source ID and L1 (or L2) destination ID), different HPN_SCI values ​​(and / or the same (or different) NDI values) can be specified on the REL_CGRSC-related SCIs of different CG periods.

[0159] For example, when a TX UE performs different TB transmissions to different target RX UEs (and / or RX UEs associated with the same session, and / or RX UEs associated with the same broadcast type) by using different CG period-related REL_CGRSCs (and / or when a TX UE performs different TB transmissions by using the same L1 (or L2) source ID and L1 (or L2) destination ID through different CG period-related REL_CGRSCs), the HPN_SCI value and NDI value can be specified the same (or different) in the REL_CGRSC-related SCIs of different CG periods (or the HPN_SCI value can be specified the same (or different), and the NDI value can be specified different (or the same)).

[0160] For example, when a TX UE performs a (TB) retransmission against the same target RX UE (and / or an RX UE associated with the same session and / or an RX UE associated with the same broadcast type) by using REL_CGRSC associated with a specific CG period (and / or when a TX UE performs a retransmission (e.g., a TB retransmission) using the same L1 (or L2) source ID and L1 (or L2) destination ID), the HPN_SCI value and NDI value can be specified on the SCI in the same way.

[0161] According to embodiments of this disclosure, during Mode 1CG operation, when a TB transmission is performed via retransmission resources (ADD_RRSC) additionally allocated via DG DCI, the NDI value on the relevant SCI can be specified according to the following rules. For example, during Mode 1CG operation, when a TB transmission is performed via retransmission resources (ADD_RRSC) additionally allocated via DG DCI, whether to switch the NDI can also be determined according to the following rules.

[0162] For example, the NDI value on the SCI associated with the ADD_RRSC (e.g., for a specific CG period) of the REL_CGRSC (LINK_CGRSC) can be configured to be used / maintained in the same way as the NDI on the ADD_RRSC associated SCI. Here, for example, the LINK_CGRSC can be derived from information such as the CG index on the DG DCI that schedules the ADD_RRSC and / or HPN_DCI.

[0163] According to embodiments of this disclosure, a Mode 1 UE can be configured to report a portion of subsequent information to the (serving) base station via predefined signaling. For example, the predefined signaling may include RRC messages and / or Media Access Control (MAC) control elements (CEs).

[0164] - Mapping between "REL_CGRSC related HPN_DCI" and "HPN_SCI on SCI related to TB transmitted via (corresponding) REL_CGRSC" - Target (receiving) UE / group information (e.g., the (L1 or L2) ID of the destination UE) using "REL_CGRSC related HPN_DCI (or HPN_DCI related REL_CGRSC)".

[0165] - Session-related information (e.g., session ID / index)

[0166] - Service-related information (e.g., application ID)

[0167] - Information related to service priorities (and / or requirements)

[0168] - Information related to the broadcast type (e.g., unicast, multicast, broadcast).

[0169] - Information related to the Mode 1 UE itself (e.g., C-RNTI, source (L1 or L2) ID)

[0170] Table 5 illustrates the process of using the HARQ buffer for refreshing the sidelink process.

[0171] [Table 5]

[0172]

[0173]

[0174] Referring to Table 5, regarding sidelink grants occurring within a PSSCH period, when a configured sidelink grant is activated, and when a sidelink grant occurring within a PSSCH period corresponds to the first PSSCH transmission opportunity within the sidelink CG period of the configured sidelink grant, the UE's MAC layer for each PSSCH duration: i) can configure the HARQ process ID as the HARQ process ID associated with the PSSCH period, and if possible, for example, can also configure the HARQ process IDs associated with all subsequent PSSCH intervals occurring within the sidelink CG period used for the configured sidelink grant as the HARQ process IDs associated with the PSSCH intervals; ii) can determine that the PSSCH period is used for the initial transmission; iii) can refresh the HARQ buffer of the sidelink process associated with the HARQ process ID. For example, in a configured sidelink grant, the HARQ process ID associated with the first time slot of the SL transmission can be determined based on the above equation.

[0175] Table 6 shows the procedure for switching NDI.

[0176] [Table 6]

[0177]

[0178]

[0179] refer to Figure 6 For each sidelink license, when the sidelink license is a configured sidelink license and no MAC PDU is obtained within the sidelink CG period of the configured sidelink license, the sidelink HARQ entity can associate the sidelink process with the license. Furthermore, for the associated sidelink process, the sidelink HARQ entity can obtain the MAC PDU to be sent, and if a HARQ process ID is configured for the sidelink license, it can associate the sidelink process with the HARQ process ID used for the sidelink license. Additionally, the sidelink HARQ entity can determine the sidelink transmission information of the source / destination pair TB of the MAC PDU, which can i) configure the L1 source ID as 8 LSB of the L2 source ID of the MAC PDU, ii) configure the L1 destination ID as 16 LSB of the L2 destination ID of the MAC PDU, iii) associate the sidelink process with the sidelink process ID, and iv) compare the sidelink identification information with the value of the previously (same) transmitted sidelink process ID corresponding to the MAC PDU, and consider it to be the NDI for switching, and can configure the NDI to the switching value.

[0180] Figure 12The process of a first device performing wireless communication according to an embodiment of the present disclosure is illustrated. Figure 12 The embodiments can be combined with various embodiments of this disclosure.

[0181] refer to Figure 12 In step S1210, the first device can receive a configuration grant from the base station. In step S1220, the first device can obtain a first Hybrid Automatic Repeat Request (HARQ) process identifier ID associated with a first period of the configuration grant. In step S1230, the first device can send a first Physical Side Link Shared Channel (PSSCH) to the second device based on a first resource included in the first period. In step S1240, the first device can obtain a second HARQ process ID associated with a second period of the configuration grant. For example, the second HARQ process ID associated with the second period can be the same as the first HARQ process ID. In step S1250, the first device can send a second PSSCH to the second device based on a second resource included in the second period. For example, based on a second HARQ process ID that is the same as the first HARQ process ID, the New Data Indicator (NDI) associated with the second PSSCH can be the value to which the NDI associated with the first PSSCH was switched.

[0182] For example, the first HARQ process ID can be mapped one-to-one with the first sidelink SL process ID associated with the first PSSCH.

[0183] For example, based on the resources configured related to the Physical Uplink Control Channel (PUCCH) for the first PSSCH, the first HARQ process ID can be mapped one-to-one with the first SL process ID.

[0184] For example, the first SL process ID can be included in the first side link control information (SCI) associated with the first PSSCH.

[0185] For example, the SL identification information of the first device associated with the first PSSCH can be the same as the SL identification information of the first device associated with the second PSSCH.

[0186] For example, the first SL process ID associated with the first PSSCH can be the same as the second SL process ID associated with the second PSSCH.

[0187] For example, the first device may receive dynamic permission from the base station including a third resource associated with the first HARQ process ID; and based on the third resource, retransmit the first PSSCH to the second device.

[0188] For example, the NDI associated with the first PSSCH retransmitted can be the same as the NDI associated with the first PSSCH.

[0189] For example, the third SL process ID associated with the first PSSCH retransmitted can be the same as the first SL process ID associated with the first PSSCH.

[0190] For example, the first device may refresh the buffer associated with the second HARQ process ID based on the fact that the second HARQ process ID is the same as the first HARQ process ID.

[0191] For example, the buffer associated with the second HARQ process ID can be refreshed based on the expiration of the timer associated with the second HARQ process ID.

[0192] For example, the first device may also report the mapping relationship between the first HARQ process ID and the first SL process ID associated with the first PSSCH.

[0193] For example, mapping relationships can be reported via Radio Resource Control (RRC) messages or Media Access Control (MAC) control elements (CE).

[0194] The above embodiments can be applied to various devices described below. For example, the processor 102 of the first device 100 can control the transceiver 106 to receive a configuration grant from a base station. Furthermore, the processor 102 of the first device 100 can obtain a first Hybrid Automatic Repeat Request (HARQ) process identifier ID associated with a first period of the configuration grant. Furthermore, the processor 102 of the first device 100 can control the transceiver 106 to send a first Physical Side Link Shared Channel (PSSCH) to a second device based on a first resource included in the first period. Furthermore, the processor 102 of the first device 100 can obtain a second HARQ process ID associated with a second period of the configuration grant. Furthermore, the processor 102 of the first device 100 can control the transceiver 106 to send a second PSSCH to the second device based on a second resource included in the second period.

[0195] According to embodiments of this disclosure, a first apparatus for performing wireless communication can be proposed. For example, the first apparatus may include: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute instructions to: receive a configuration grant from a base station; obtain a first Hybrid Automatic Repeat Request (HARQ) process identifier ID associated with a first period of the configuration grant; send a first Physical Side Link Shared Channel (PSSCH) to a second apparatus based on a first resource included in the first period; obtain a second HARQ process ID associated with a second period of the configuration grant, wherein the second HARQ process ID associated with the second period is the same as the first HARQ process ID; and send a second PSSCH to the second apparatus based on a second resource included in the second period, wherein, based on the second HARQ process ID which is the same as the first HARQ process ID, a New Data Indicator (NDI) associated with the second PSSCH is a value to which the NDI associated with the first PSSCH is switched.

[0196] According to embodiments of this disclosure, an apparatus configured to control a first user equipment (UE) can be provided. For example, the apparatus may include: one or more processors; and one or more memories operatively connected to the one or more processors and storing instructions. For example, the one or more processors may execute instructions to: receive a configuration grant from a base station; obtain a first Hybrid Automatic Repeat Request (HARQ) process identifier ID associated with a first period of the configuration grant; transmit a first Physical Side Link Shared Channel (PSSCH) to a second UE based on a first resource included in the first period; obtain a second HARQ process ID associated with a second period of the configuration grant, wherein the second HARQ process ID associated with the second period is the same as the first HARQ process ID; and transmit a second PSSCH to the second UE based on a second resource included in the second period, wherein, based on the second HARQ process ID which is the same as the first HARQ process ID, a New Data Indicator (NDI) associated with the second PSSCH is a value to which the NDI associated with the first PSSCH is switched.

[0197] According to embodiments of this disclosure, a non-transitory computer-readable storage medium storing instructions can be provided. For example, when executed, the instructions can cause a first device to: receive a configuration grant from a base station; obtain a first Hybrid Automatic Repeat Request (HARQ) process identifier ID associated with a first period of the configuration grant; send a first Physical Side Link Shared Channel (PSSCH) to a second device based on a first resource included in the first period; obtain a second HARQ process ID associated with a second period of the configuration grant, wherein the second HARQ process ID associated with the second period is the same as the first HARQ process ID; and send a second PSSCH to the second device based on a second resource included in the second period, wherein, based on the second HARQ process ID which is the same as the first HARQ process ID, a New Data Indicator (NDI) associated with the second PSSCH is the value to which the NDI associated with the first PSSCH is switched.

[0198] Figure 13 The process of a second device performing wireless communication according to an embodiment of the present disclosure is illustrated. Figure 13 The embodiments can be combined with various embodiments of this disclosure.

[0199] refer to Figure 13 In step S1310, the second device may receive a first Physical Side Link Shared Channel (PSSCH) from the first device based on a first resource included in the first period of the configuration license. In step S1320, the second device may receive a second PSSCH from the first device based on a second resource included in the second period of the configuration license. For example, based on a second Hybrid Automatic Repeat Request (HARQ) process identifier ID that is the same as the first HARQ process ID, the New Data Indicator (NDI) associated with the second PSSCH may be the value to which the NDI associated with the first PSSCH is switched. The first HARQ process ID may be associated with the first period, and the second HARQ process ID may be associated with the second period.

[0200] For example, the first HARQ process ID can be mapped one-to-one with the first sidelink SL process ID associated with the first PSSCH.

[0201] The above embodiments can be applied to various devices described below. For example, the processor 202 of the second device 200 can control the transceiver 206 to receive a first physical side link shared channel (PSSCH) from the first device based on a first resource included in a first cycle of configuration permission. Furthermore, the processor 202 of the second device 200 can control the transceiver to receive a second PSSCH from the first device based on a second resource included in a second cycle of configuration permission.

[0202] According to embodiments of this disclosure, a second apparatus for performing wireless communication can be proposed. For example, the second apparatus may include: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute the instructions to: receive a first Physical Side Link Shared Channel (PSSCH) from a first apparatus based on a first resource included in a first period of configuration permission; and receive a second PSSCH from the first apparatus based on a second resource included in a second period of configuration permission, wherein a New Data Indicator (NDI) associated with the second PSSCH is a value to which the NDI associated with the first PSSCH is switched based on a second HARQ process ID that is the same as a first Hybrid Automatic Repeat Request (HARQ) process identifier ID, wherein the first HARQ process ID is associated with the first period, and wherein the second HARQ process ID is associated with the second period.

[0203] For example, the first HARQ process ID can be mapped one-to-one with the first sidelink SL process ID associated with the first PSSCH.

[0204] In the following, devices to which the respective embodiments of this disclosure may be applied will be described.

[0205] The various descriptions, functions, processes, proposals, methods and / or operating procedures described in this document can be applied to, but are not limited to, various fields requiring wireless communication / connectivity between devices (e.g., 5G).

[0206] The following description will be given in more detail with reference to the accompanying drawings. In the following drawings / description, unless otherwise described, the same reference numerals may denote the same or corresponding hardware blocks, software blocks, or functional blocks.

[0207] Figure 14 A communication system (1) according to an embodiment of the present disclosure is shown. Figure 14 The embodiments can be combined with various embodiments of this disclosure.

[0208] Reference Figure 14The communication system (1) applying various embodiments of this disclosure includes wireless devices, base stations (BS), and networks. Hereinafter, a wireless device refers to a device that performs communication using a radio access technology (RAT) (e.g., 5G New RAT (NR) or Long Term Evolution (LTE)) and may be referred to as a communication / radio / 5G device. Wireless devices may include, but are not limited to, robots (100a), vehicles (100b-1, 100b-2), extended reality (XR) devices (100c), handheld devices (100d), home appliances (100e), Internet of Things (IoT) devices (100f), and artificial intelligence (AI) devices / servers (400). For example, a vehicle may include a vehicle with wireless communication capabilities, an autonomous vehicle, and a vehicle capable of performing vehicle-to-vehicle communication. Hereinafter, a vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). XR devices can include augmented reality (AR) / virtual reality (VR) / mixed reality (MR) devices and can take the form of head-up displays (HMDs), head-up displays (HUDs) installed in vehicles, televisions, smartphones, computers, wearable devices, home appliances, digital signage, vehicles, robots, etc. Handheld devices can include smartphones, smart tablets, wearable devices (e.g., smartwatches or smart glasses) and computers (e.g., laptops). Home appliances can include TVs, refrigerators, and washing machines. IoT devices can include sensors and smart meters. For example, the BS and network can be implemented as wireless devices, and a particular wireless device (200a) can operate as a BS / network node relative to other wireless devices.

[0209] In addition to LTE, NR, and 6G, the wireless communication technologies implemented in the wireless devices 100a to 100f of this disclosure may also include narrowband Internet of Things (IoT) for low-power communication. In this case, for example, NB-IoT technology may be an example of low-power wide-area network (LPWAN) technology and may be implemented as a standard such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the aforementioned names. Alternatively or additionally, the wireless communication technologies implemented in the wireless devices 100a to 100f of this disclosure may perform communication based on LTE-M technology. In this case, as an example, LTE-M technology may be an example of LPWAN and may be referred to by various names including enhanced machine-type communication (eMTC). For example, LTE-M technology may be implemented as at least one of various standards such as 1) LTE Cat 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE machine-type communication, and / or 7) LTE M, and is not limited to the aforementioned names. Alternatively or additionally, the wireless communication technology implemented in the wireless devices 100a to 100f of this disclosure may include at least one of Bluetooth, Low Power Wide Area Network (LPWAN), and ZigBee for low power communication, and is not limited to the names mentioned above. As an example, ZigBee technology may generate personal area networks (PANs) related to low / low power digital communication based on various standards including IEEE 802.15.4, and may be referred to by various names.

[0210] Wireless devices 100a to 100f can connect to network 300 via BS 200. AI technology can be applied to wireless devices 100a to 100f, and wireless devices 100a to 100f can connect to AI server 400 via network 300. Network 300 can be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although wireless devices 100a to 100f can communicate with each other via BS 200 / network 300, wireless devices 100a to 100f can perform direct communication with each other (e.g., sidelink communication) without going through the BS / network. For example, vehicles 100b-1 and 100b-2 can perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). IoT devices (e.g., sensors) can perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0211] Wireless communication / connections 150a, 150b, or 150c can be established between wireless devices 100a to 100f / BS 200 or BS200 / BS 200. Here, the wireless communication / connection can be established via various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication), or inter-BS communication (e.g., relay, access backhaul integration (IAB)). Wireless devices and BS / wireless devices can transmit / receive radio signals to / from each other via wireless communication / connections 150a and 150b. For example, wireless communication / connections 150a and 150b can transmit / receive signals via various physical channels. For this purpose, at least a portion of various configuration information configuration processes, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and resource allocation processes for transmitting / receiving radio signals can be performed based on various proposals of this disclosure.

[0212] Figure 15 A wireless device according to an embodiment of the present disclosure is shown.

[0213] Reference Figure 15 The first wireless device (100) and the second wireless device (200) can transmit radio signals via various RATs (e.g., LTE and NR). In this document, {the first wireless device (100) and the second wireless device (200)} can correspond to... Figure 14 {Wireless Device (100x) and BS (200)} and / or {Wireless Device (100x) and Wireless Device (100x)}.

[0214] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may additionally include one or more transceivers 106 and / or one or more antennas 108. The processors 102 may control the memories 104 and / or the transceivers 106, and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed herein. For example, the processors 102 may process information in the memories 104 to generate a first information / signal, and then transmit a radio signal including the first information / signal via the transceivers 106. The processors 102 may receive a radio signal including a second information / signal via the transceivers 106, and then store the information obtained by processing the second information / signal in the memories 104. The memories 104 may be connected to the processors 102 and may store various information relating to the operation of the processors 102. For example, one or more memories 104 may store software code including commands for performing part or all of the processing controlled by one or more processors 102, or for performing the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed herein. Here, one or more processors 102 and one or more memories 104 may be part of a communication modem / circuit / chip designed to implement RAT (e.g., LTE or NR). One or more transceivers 106 may be connected to one or more processors 102 and transmit and / or receive radio signals via one or more antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. One or more transceivers 106 may be used interchangeably with one or more radio frequency (RF) units. In this disclosure, a wireless device may represent a communication modem / circuit / chip.

[0215] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and may additionally include one or more transceivers 206 and / or one or more antennas 208. The processors 202 may control the memories 204 and / or the transceivers 206, and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document. For example, the processors 202 may process information in the memories 204 to generate a third message / signal, and subsequently transmit a radio signal including the third message / signal via the transceivers 206. The processors 202 may receive a radio signal including a fourth message / signal via the transceivers 106, and then store the information obtained by processing the fourth message / signal in the memories 204. The memories 204 may be connected to the processors 202 and may store various information relating to the operation of the processors 202. For example, one or more memories 204 may store software code including commands for performing part or all of the processing controlled by one or more processors 202, or for performing the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document. Here, one or more processors 202 and one or more memories 204 may be part of a communication modem / circuit / chip designed to implement RAT (e.g., LTE or NR). One or more transceivers 206 may be connected to one or more processors 202 and transmit and / or receive radio signals via one or more antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. One or more transceivers 206 may be used interchangeably with one or more RF units. In this disclosure, a wireless device may represent a communication modem / circuit / chip.

[0216] The hardware components of wireless devices 100 and 200 will now be described in more detail. One or more protocol layers may be implemented, but are not limited to, by one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). One or more processors 102 and 202 may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, proposals, methods, and / or operational flows disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operational flows disclosed in this document. One or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operational flows disclosed in this document, and provide the generated signals to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive signals (e.g., baseband signals) from one or more transceivers 106 and 206 and acquire PDUs, SDUs, messages, control information, data, or information in accordance with the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document.

[0217] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field-programmable gate arrays (FPGAs) may be included in one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document may be implemented using firmware or software, and such firmware or software may be configured to include modules, processes, or functions. Firmware or software configured to perform the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document may be included in one or more processors 102 and 202 or stored in one or more memories 104 and 204, thereby being driven by one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document may be implemented using software or firmware in the form of code, commands, and / or command sets.

[0218] One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and may store various types of data, signals, messages, information, programs, code, instructions, and / or commands. One or more memories 104 and 204 may be composed of read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard drives, registers, cache memory, computer-readable storage media, and / or combinations thereof. One or more memories 104 and 204 may be located internally and / or externally to one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 via various technologies such as wired or wireless connections.

[0219] One or more transceivers 106 and 206 may transmit user data, control information, and / or radio signals / channels mentioned in the methods and / or operating procedures of this document to one or more other devices. One or more transceivers 106 and 206 may receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, processes, proposals, methods, and / or operating procedures disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and may transmit and receive radio signals. For example, one or more processors 102 and 202 may perform control such that one or more transceivers 106 and 206 may transmit user data, control information, or radio signals to one or more other devices. One or more processors 102 and 202 may perform control such that one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to transmit and receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, processes, proposals, methods, and / or operational procedures disclosed in this document through one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert received radio signals / channels, etc., from RF band signals to baseband signals for processing using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert the processed user data, control information, radio signals / channels, etc., from baseband signals to RF band signals. For this purpose, one or more transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0220] Figure 16 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown.

[0221] Reference Figure 16 The signal processing circuit (1000) may include a scrambler (1010), a modulator (1020), a layer mapper (1030), a pre-encoder (1040), a resource mapper (1050), and a signal generator (1060). It can perform... Figure 16 Operations / functions, but not limited to Figure 15 The processors (102, 202) and / or transceivers (106, 206) can be used. Figure 15Implemented by processors (102, 202) and / or transceivers (106, 206) Figure 16 Hardware components. For example, it can be achieved through... Figure 15 The processors (102, 202) implement boxes 1010 to 1060. Alternatively, they can be implemented using... Figure 15 The processors (102, 202) implement boxes 1010 to 1050, and can be used to... Figure 15 The transceivers (106, 206) are used to implement the frame 1060.

[0222] Can be via Figure 16 The signal processing circuit (1000) converts codewords into radio signals. In this document, a codeword is a sequence of encoded bits for an information block. The information block may include transport blocks (e.g., UL-SCH transport blocks, DL-SCH transport blocks). Radio signals can be transmitted via various physical channels (e.g., PUSCH and PDSCH).

[0223] Specifically, the codeword can be converted into a scrambled bit sequence by scrambler 1010. The scrambling sequence used for scrambling can be generated based on an initial value, which may include the ID information of the wireless device. The scrambled bit sequence can be modulated into a modulation symbol sequence by modulator 1020. The modulation scheme may include pi / 2-binary phase shift keying (pi / 2-BPSK), m-phase shift keying (m-PSK), and m-quadrature amplitude modulation (m-QAM). The complex modulation symbol sequence can be mapped to one or more transmission layers by layer mapper 1030. The modulation symbols of each transmission layer can be mapped (pre-coded) to one or more corresponding antenna ports by pre-encoder 1040. The output z of pre-encoder 1040 can be obtained by multiplying the output y of layer mapper 1030 by an N*M precoding matrix W. Here, N is the number of antenna ports, and M is the number of transmission layers. Pre-encoder 1040 can perform precoding after performing transform precoding (e.g., DFT) for the complex modulation symbols. Alternatively, the precoder 1040 can perform precoding without performing transform precoding.

[0224] Resource mapper 1050 maps modulation symbols for each antenna port to time-frequency resources. Time-frequency resources may include multiple symbols in the time domain (e.g., CP-OFDMA symbols and DFT-s-OFDMA symbols) and multiple subcarriers in the frequency domain. Signal generator 1060 can generate radio signals from the mapped modulation symbols, and the generated radio signals can be transmitted to other devices via each antenna. For this purpose, signal generator 1060 may include an inverse fast Fourier transform (IFFT) module, a cyclic prefix (CP) inserter, a digital-to-analog converter (DAC), and an up-converter.

[0225] Can be with Figure 16 The signal processing procedures (1010-1060) are configured in the reverse manner for the signal processing procedures used to receive signals in a wireless device. For example, a wireless device (e.g., Figure 15 The receiver (e.g., 100, 200) can receive radio signals from the outside via the antenna port / transceiver. The received radio signals can be converted into baseband signals using a signal recovery unit. For this purpose, the signal recovery unit may include a frequency downlink converter, an analog-to-digital converter (ADC), a CP remover, and a Fast Fourier Transform (FFT) module. Next, the baseband signals can be recovered into codewords through a resource demapping process, a post-encoding process, a demodulation processor, and a descrambling process. The codewords can be recovered into the original information blocks through decoding. Therefore, the signal processing circuitry (not illustrated) used for receiving signals may include a signal recovery unit, a resource demapping unit, a post-encoder, a demodulator, a descrambler, and a decoder.

[0226] Figure 17 Another example of a wireless device according to an embodiment of this disclosure is shown. The wireless device can be implemented in various forms depending on the use case / service (see reference). Figure 14 ).

[0227] Reference Figure 17 Wireless devices (100, 200) can correspond to Figure 15 The wireless devices (100, 200) can be configured using various elements, components, units / parts and / or modules. For example, each of the wireless devices (100, 200) may include a communication unit (110), a control unit (120), a memory unit (130), and additional components (140). The communication unit may include a communication circuit (112) and one or more transceivers (114). For example, the communication circuit (112) may include... Figure 15 One or more processors (102, 202) and / or one or more memories (104, 204). For example, transceiver (114) may include one or more transceivers. Figure 15The device comprises one or more transceivers (106, 206) and / or one or more antennas (108, 208). The control unit (120) is electrically connected to the communication unit (110), memory (130), and add-ons (140), and controls the overall operation of the wireless device. For example, the control unit (120) may control the electrical / mechanical operation of the wireless device based on programs / code / commands / information stored in the memory unit (130). The control unit (120) may transmit information stored in the memory unit (130) to an external source (e.g., other communication devices) via the communication unit (110) through a wireless / wired interface, or store information received from an external source (e.g., other communication devices) via the communication unit (110) through a wireless / wired interface in the memory unit (130).

[0228] The add-on component (140) can be configured in various ways depending on the type of wireless device. For example, the add-on component (140) may include at least one of a power unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device can be implemented in, but is not limited to, the following forms: robot ( Figure 14 100a), vehicles ( Figure 14 100b-1 and 100b-2), XR equipment ( Figure 14 100c), handheld devices (100d of Figure 1446), home appliances ( Figure 14 100e), IoT devices ( Figure 14 100f), digital broadcasting terminals, hologram devices, public safety equipment, MTC devices, medical devices, fintech devices (or financial devices), security devices, climate / environmental devices, AI servers / devices ( Figure 14 400), BS ( Figure 14 (e.g., 200), network nodes, etc. Depending on the use case / service, wireless devices can be used in mobile or fixed locations.

[0229] exist Figure 17In the wireless devices (100, 200), all various elements, components, units / parts, and / or modules can be connected to each other via wired interfaces, or at least partially via communication unit (110). For example, in each of the wireless devices (100, 200), the control unit (120) and the communication unit (110) can be connected via a wired connection, and the control unit (120) and the first unit (e.g., 130, 140) can be wirelessly connected via the communication unit (110). Each element, component, unit / part, and / or module within the wireless devices (100, 200) may also include one or more elements. For example, the control unit (120) may be constructed using a collection of one or more processors. As an example, the control unit (120) may be constructed using a collection of communication control processors, application processors, electronic control units (ECUs), graphics processing units, and memory control processors. As another example, memory (130) can be constructed using random access memory (RAM), dynamic RAM (DRAM), read-only memory (ROM), flash memory, volatile memory, non-volatile memory and / or combinations thereof.

[0230] The implementation will be described in detail below with reference to the accompanying drawings. Figure 17 Examples.

[0231] Figure 18 A handheld device according to an embodiment of the present disclosure is illustrated. The handheld device may include a smartphone, smartpad, wearable device (e.g., a smartwatch or smart glasses), or portable computer (e.g., a laptop). The handheld device may be referred to as a mobile station (MS), user terminal (UT), mobile subscriber station (MSS), subscriber station (SS), advanced mobile station (AMS), or wireless terminal (WT).

[0232] Reference Figure 18 The handheld device (100) may include an antenna unit (108), a communication unit (110), a control unit (120), a memory unit (130), a power supply unit (140a), an interface unit (140b), and an I / O unit (140c). The antenna unit (108) may be configured as part of the communication unit (110). Boxes 110 to 130 / 140a to 140c correspond to respectively Figure 17 The frame is 110 to 130 / 140.

[0233] Communication unit 110 can send and receive signals (e.g., data signals and control signals) to and from other wireless devices or BSs. Control unit 120 can perform various operations by controlling the constituent elements of handheld device 100. Control unit 120 may include an application processor (AP). Memory unit 130 can store data / parameters / programs / codes / commands required to drive handheld device 100. Memory unit 130 can store input / output data / information. Power supply unit 140a can supply power to handheld device 100 and includes wired / wireless charging circuitry, a battery, etc. Interface unit 140b can support connection of handheld device 100 to other external devices. Interface unit 140b may include various ports for connecting to external devices (e.g., audio I / O ports and video I / O ports). I / O unit 140c can input or output user-input video information / signals, audio information / signals, data, and / or information. I / O unit 140c may include a camera, microphone, user input unit, display unit 140d, speaker, and / or haptic module.

[0234] For example, in the case of data communication, I / O unit 140c can acquire user input information / signals (e.g., touch, text, voice, image, or video), and the acquired information / signals can be stored in memory unit 130. Communication unit 110 can convert the information / signals stored in memory into radio signals and transmit the converted radio signals directly to other wireless devices or to the BS. Communication unit 110 can receive radio signals from other wireless devices or the BS, and then recover the received radio signals into the original information / signals. The recovered information / signals can be stored in memory unit 130 and can be output in various types (e.g., text, voice, image, video, or haptic feedback) through I / O unit 140.

[0235] Figure 19 A vehicle or autonomous vehicle according to an embodiment of this disclosure is shown. The vehicle or autonomous vehicle can be implemented by mobile robots, cars, trains, manned / unmanned aerial vehicles (AVs), ships, etc.

[0236] Reference Figure 19 The vehicle or autonomous vehicle (100) may include an antenna unit (108), a communication unit (110), a control unit (120), a drive unit (140a), a power supply unit (140b), a sensor unit (140c), and an autonomous driving unit (140d). The antenna unit (108) may be configured as part of the communication unit (110). Boxes 110 / 130 / 140a to 140d correspond to respectively Figure 17 The frame size is 110 / 130 / 140.

[0237] Communication unit 110 can send and receive signals (e.g., data signals and control signals) to and from external devices such as other vehicles, BS (e.g., gNB and roadside units), and servers. Control unit 120 can perform various operations by controlling the components of the vehicle or autonomous vehicle 100. Control unit 120 may include electronic control unit (ECU). Drive unit 140a can cause the vehicle or autonomous vehicle 100 to move on the road. Drive unit 140a may include engine, motor, transmission system, wheels, brakes, steering equipment, etc. Power supply unit 140b can supply power to the vehicle or autonomous vehicle 100 and may include wired / wireless charging circuitry, batteries, etc. Sensor unit 140c can acquire vehicle status, external environment information, user information, etc. Sensor unit 140c may include inertial measurement unit (IMU) sensors, collision sensors, wheel sensors, speed sensors, slope sensors, weight sensors, heading sensors, position modules, vehicle forward / reverse sensors, battery sensors, fuel sensors, tire sensors, steering sensors, temperature sensors, humidity sensors, ultrasonic sensors, lighting sensors, pedal position sensors, etc. Autonomous driving unit 140d can implement technologies for maintaining the vehicle's lane, technologies for automatically adjusting speed (e.g., adaptive cruise control), technologies for autonomously driving along a defined path, and technologies for automatically setting a route when a destination is set, etc.

[0238] For example, communication unit 110 can receive map data, traffic information data, etc., from an external server. Autonomous driving unit 140d can generate autonomous driving paths and driving plans from the acquired data. Control unit 120 can control drive unit 140a, enabling the vehicle or autonomous vehicle 100 to move along the autonomous driving path according to the driving plan (e.g., speed / direction control). During autonomous driving, communication unit 110 can periodically or non-periodically acquire the latest traffic information data from an external server and acquire surrounding traffic information data from neighboring vehicles. During autonomous driving, sensor unit 140c can acquire vehicle status and / or surrounding environment information. Autonomous driving unit 140d can update the autonomous driving path and driving plan based on newly acquired data / information. Communication unit 110 can transmit information about vehicle location, autonomous driving path, and / or driving plan to an external server. The external server can predict traffic information data using AI technology, etc., based on information collected from the vehicle or autonomous vehicle, and provide the predicted traffic information data to the vehicle or autonomous vehicle.

[0239] The claims in this specification can be combined in various ways. For example, technical features in the method claims can be combined to implement or perform in an apparatus, and technical features in the apparatus claims can be combined to implement or perform in a method. Additionally, technical features in one or more method claims and one or more apparatus claims can be combined to implement or perform in a method.

Claims

1. A method for performing wireless communication by a first device, the method comprising: Receive configuration permission from the base station; Obtain the first Hybrid Automatic Repeat Request (HARQ) process identifier ID associated with the first cycle of the configuration license; Based on the first resources included in the first cycle, the first physical side link shared channel (PSSCH) is sent to the second device. Obtain the second HARQ process ID associated with the second cycle of the configuration license. Wherein, based on the periodic structure determined by the number of HARQ processes, the second HARQ process ID associated with the second period is the same as the first HARQ process ID; and Based on the second resources included in the second cycle, a second PSSCH is sent to the second device. Wherein, based on the second HARQ process ID which is the same as the first HARQ process ID, the new data indicator NDI associated with the second PSSCH is the value to which the NDI associated with the first PSSCH is switched.

2. The method according to claim 1, wherein, The first HARQ process ID is mapped one-to-one with the first sidelink SL process ID related to the first PSSCH.

3. The method according to claim 2, wherein, Based on the resources configured related to the Physical Uplink Control Channel (PUCCH) for the first PSSCH, the first HARQ process ID is mapped one-to-one with the first SL process ID.

4. The method according to claim 2, wherein, The first SL process ID is included in the first side link control information (SCI) associated with the first PSSCH.

5. The method according to claim 1, wherein, The SL identification information of the first device associated with the first PSSCH is the same as the SL identification information of the first device associated with the second PSSCH.

6. The method according to claim 5, wherein, The first SL process ID associated with the first PSSCH and the second SL process ID associated with the second PSSCH are the same.

7. The method of claim 1, further comprising: Receive from the base station a dynamic license for a third resource associated with the first HARQ process ID; as well as Based on the third resource, the first PSSCH is retransmitted to the second device.

8. The method according to claim 7, wherein, The NDI associated with the first PSSCH retransmitted is the same as the NDI associated with the first PSSCH.

9. The method according to claim 7, wherein, The third SL process ID associated with the retransmitted first PSSCH is the same as the first SL process ID associated with the first PSSCH.

10. The method of claim 1, further comprising: Since the second HARQ process ID is the same as the first HARQ process ID, the buffer associated with the second HARQ process ID is refreshed.

11. The method according to claim 10, wherein, The buffer associated with the second HARQ process ID is refreshed upon the expiration of the timer associated with the second HARQ process ID.

12. The method of claim 1, further comprising: The report describes the mapping relationship between the first HARQ process ID and the first SL process ID associated with the first PSSCH.

13. The method according to claim 12, wherein, The mapping relationship is reported via Radio Resource Control (RRC) messages or Media Access Control (MAC) control elements (CE).

14. A first means for performing wireless communication, the first means comprising: One or more memories, wherein the one or more memories store instructions; One or more transceivers; as well as One or more processors, the one or more processors being connected to the one or more memories and the one or more transceivers, wherein the one or more processors execute the instructions to: Receive configuration permission from the base station; Obtain the first Hybrid Automatic Repeat Request (HARQ) process identifier ID associated with the first cycle of the configuration license; Based on the first resources included in the first cycle, the first physical side link shared channel (PSSCH) is sent to the second device. Obtain the second HARQ process ID associated with the second cycle of the configuration license. Wherein, based on the periodic structure determined by the number of HARQ processes, the second HARQ process ID associated with the second period is the same as the first HARQ process ID; and Based on the second resources included in the second cycle, a second PSSCH is sent to the second device. Wherein, based on the second HARQ process ID which is the same as the first HARQ process ID, the new data indicator NDI associated with the second PSSCH is the value to which the NDI associated with the first PSSCH is switched.

15. An apparatus configured to control a first user equipment (UE), the apparatus comprising: One or more processors; as well as One or more memories, operatively connected to the one or more processors and storing instructions, wherein the one or more processors execute the instructions to: Receive configuration permission from the base station; Obtain the first Hybrid Automatic Repeat Request (HARQ) process identifier ID associated with the first cycle of the configuration license; Based on the first resources included in the first cycle, the first physical side link shared channel (PSSCH) is sent to the second UE. Obtain the second HARQ process ID associated with the second cycle of the configuration license. Wherein, based on the periodic structure determined by the number of HARQ processes, the second HARQ process ID associated with the second period is the same as the first HARQ process ID; and Based on the second resources included in the second cycle, a second PSSCH is sent to the second UE. Wherein, based on the second HARQ process ID which is the same as the first HARQ process ID, the new data indicator NDI associated with the second PSSCH is the value to which the NDI associated with the first PSSCH is switched.

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