Method and apparatus for transmitting S-SSB in NR V2X

Abstract

According to an embodiment of the present disclosure, a method for a first device to perform side link communication is provided. The method includes the following steps: receiving information about S-SSB transmission resources from a base station; determining a plurality of first time slots in a first S-SSB cycle with an S-SSB cycle length associated with a plurality of first S-SSBs based on the information about the S-SSB transmission resources; and transmitting the plurality of first S-SSBs to a second device on the plurality of first time slots, wherein, within the first S-SSB cycle, the time slot intervals between the plurality of first time slots may be the same.

Description

Technical Field

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

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

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

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

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

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

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

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

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

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

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

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

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

[0014] Technical Purpose

[0015] The present disclosure provides a method for communication between devices (or UEs) based on V2X communication and a device (or UE) performing the method.

[0016] The present disclosure provides a method for transmitting a sidelink synchronization signal block (S-SSB) in NR V2X and an apparatus (or UE) for performing the method.

[0017] Technical Solution

[0018] Based on an embodiment of the present disclosure, a method for a first device to perform a side link (SL) communication may be provided. The method may include the following steps: receiving information about a side link synchronization signal block (S-SSB) transmission resource from a base station; determining a plurality of first time slots within a first S-SSB cycle of an S-SSB cycle length associated with a plurality of first S-SSBs based on the information about the S-SSB transmission resource; and transmitting the plurality of first S-SSBs to a second device on the plurality of first time slots, wherein the time slot intervals between the plurality of first time slots within the first S-SSB cycle are the same.

[0019] Based on an embodiment of the present disclosure, a first device configured to perform side link (SL) communication may be provided. The first device may include: at least one memory storing instructions; at least one transceiver; and at least one processor connecting the at least one memory and the at least one transceiver. The at least one processor may execute instructions to: receive information about side link synchronization signal block (S-SSB) transmission resources from a base station; determine a plurality of first time slots within a first S-SSB cycle of an S-SSB cycle length associated with a plurality of first S-SSBs based on the information about the S-SSB transmission resources; and send the plurality of first S-SSBs to a second device on the plurality of first time slots, wherein, within the first S-SSB cycle, the time slot intervals between the plurality of first time slots are the same.

[0020] Based on the embodiments of the present disclosure, a device (or chip (set)) configured to control a first user equipment (UE) may be provided. The device may include: at least one processor; and at least one memory connected to the at least one processor and storing instructions. The at least one processor may execute instructions to: receive information about a secondary link synchronization signal block (S-SSB) transmission resource from a base station; determine a plurality of first time slots within a first S-SSB cycle of an S-SSB cycle length associated with a plurality of first S-SSBs based on the information about the S-SSB transmission resource; and send the plurality of first S-SSBs to a second UE on the plurality of first time slots, wherein, within the first S-SSB cycle, the time slot intervals between the plurality of first time slots are the same.

[0021] Based on the embodiments of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. When the instructions are executed, the first device may: receive information about a sublink synchronization signal block (S-SSB) transmission resource from a base station; determine a plurality of first time slots within a first S-SSB cycle of an S-SSB cycle length associated with a plurality of first S-SSBs based on the information about the S-SSB transmission resource; and transmit the plurality of first S-SSBs to a second device on the plurality of first time slots, wherein the time slot intervals between the plurality of first time slots within the first S-SSB cycle are the same.

[0022] Based on an embodiment of the present disclosure, a method for a second device to perform a sub-link (SL) communication may be provided. The method may include the following steps: receiving a plurality of first S-SSBs from a first device at a plurality of first time slots within a first S-SSB cycle of an S-SSB cycle length, wherein the plurality of first time slots associated with the plurality of first S-SSBs are determined by the first device based on information about S-SSB transmission resources received by the first device from a base station, and wherein, within the first S-SSB cycle, the time slot intervals between the plurality of first time slots are the same.

[0023] Based on an embodiment of the present disclosure, a second device configured to perform side link (SL) communication may be provided. The second device may include: at least one memory storing instructions; at least one transceiver; and at least one processor connecting the at least one memory and the at least one transceiver. The at least one processor may execute the instructions to: receive a plurality of first S-SSBs from a first device on a plurality of first time slots within a first S-SSB cycle of an S-SSB cycle length, wherein the plurality of first time slots associated with the plurality of first S-SSBs are determined by the first device based on information about S-SSB transmission resources received by the first device from a base station, and wherein, within the first S-SSB cycle, the time slot intervals between the plurality of first time slots are the same.

[0024] Effects of the present disclosure

[0025] Based on the present disclosure, V2X communication between devices (UEs) can be performed efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a diagram for describing NR-based V2X communication compared with V2X communication based on a RAT used before NR.

[0027] Figure 2 The structure of the NR system according to an embodiment of the present disclosure is shown.

[0028] Figure 3 The functional division between NG-RAN and 5GC according to an embodiment of the present disclosure is shown.

[0029] Figure 4a and Figure 4b A radio protocol architecture according to an embodiment of the present disclosure is shown.

[0030] Figure 5 The structure of the NR system according to an embodiment of the present disclosure is shown.

[0031] Figure 6 The structure of the time slot of the NR frame according to an embodiment of the present disclosure is shown.

[0032] Figure 7 An example of a BWP according to an embodiment of the present disclosure is shown.

[0033] Figure 8a and Figure 8b A radio protocol architecture for SL communication based on an embodiment of the present disclosure is shown.

[0034] Fig. 9 A UE performing V2X or SL communication according to an embodiment of the present disclosure is shown.

[0035] Fig.10a and Fig.10b A process in which a UE according to an embodiment of the present disclosure performs V2X or SL communication based on a transmission mode is shown.

[0036] Figures 11a to 11c Three types of broadcasts based on embodiments of the present disclosure are shown.

[0037] Fig.12 An example of sending multiple S-SSBs within an S-SSB period is shown.

[0038] Fig.13 A method in which a first device sends a PSBCH to a second device based on an embodiment of the present disclosure is shown.

[0039] Fig.14 A method for a second device to receive a PSBCH from a first device according to an embodiment of the present disclosure is shown.

[0040] Fig.15 The operation of the first device according to the embodiment of the present disclosure is shown.

[0041] Fig.16 The operation of the base station according to the embodiment of the present disclosure is shown.

[0042] Fig.17A communication system 1 according to an embodiment of the present disclosure is shown.

[0043] Fig.18 A wireless device according to an embodiment of the present disclosure is shown.

[0044] Fig.19 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown.

[0045] Fig. 20 A wireless device according to an embodiment of the present disclosure is shown.

[0046] Fig.21 A handheld device according to an embodiment of the present disclosure is shown.

[0047] Fig. 22 An automobile or autonomous vehicle according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0048] In this specification, "A or B" may mean "only A", "only B", or "both A and B". In other words, in this specification, "A or B" may be interpreted as "A and / or B". For example, in this specification, "A, B or C" may mean "only A", "only B", "only C", or "any combination of A, B, C".

[0049] A slash ( / ) or a comma used in this specification may mean "and / or". For example, "A / B" may mean "A and / or B". Thus, "A / B" may mean "only A", "only B", or "both A and B". For example, "A, B, C" may mean "A, B, or C".

[0050] In the present specification, "at least one of A and B" may mean "only A", "only B", or "both A and B". In addition, in the present specification, the expression "at least one of A or B" or "at least one of A and / or B" may be interpreted as "at least one of A and B".

[0051] In addition, in the present specification, "at least one of A, B, and C" may mean "only A", "only B", "only C", or "any combination of A, B, and C". In addition, "at least one of A, B, or C" or "at least one of A, B and / or C" may mean "at least one of A, B, and C".

[0052] In addition, brackets used in this specification may mean "for example". Specifically, when indicated as "control information (PDCCH)", this may mean that "PDCCH" is proposed as an example of "control information". In other words, the "control information" of this specification is not limited to "PDCCH", and "PDDCH" may be proposed as an example of "control information". Specifically, when indicated as "control information (ie, PDCCH)", this may also mean that "PDCCH" is proposed as an example of "control information".

[0053] The technical features described in each of the drawings in this specification may be implemented separately or simultaneously.

[0054] The techniques described below can be used in various wireless communication systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. CDMA can be implemented using radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA-2000. TDMA can be implemented using radio technologies such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA can be implemented using radio technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA), etc. IEEE 802.16m is an evolved version of IEEE 802.16e and provides backward compatibility for systems based on IEEE 802.16e. UTRA is part of Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is a part of Evolved UMTS (E-UMTS) using E-UTRA. 3GPP LTE uses OFDMA in the downlink and SC-FDMA in the uplink. LTE-Advanced (LTE-A) is an evolution of LTE.

[0055] 5G NR is a subsequent technology of LTE-A corresponding to a new mobile communication system with high performance, low latency, high availability, etc. 5G NR can use all available spectrum resources including low frequency bands less than 1 GHz, intermediate frequency bands from 1 GHz to 10 GHz, and high frequency (millimeter wave) above 24 GHz.

[0056] For the sake of clarity, the following description will mainly focus on LTE-A or 5G NR. However, the technical features of the embodiments of the present disclosure will not be limited thereto.

[0057] Figure 2 The structure of the NR system according to an embodiment of the present disclosure is shown. Figure 2 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0058] Reference Figure 2 , the next generation radio access network (NG-RAN) may include a BS 20 that provides user plane and control plane protocol terminations to the UE 10. For example, the BS 20 may include a next generation Node B (gNB) and / or an evolved Node B (eNB). For example, the UE 10 may be fixed or mobile and may be referred to as other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device, etc. For example, the BS may be referred to as a fixed station that communicates with the UE 10 and may be referred to as other terms such as a base transceiver system (BTS), an access point (AP), etc.

[0059] Figure 2 The embodiment of the present invention illustrates a case where only gNB is included. BS20 may be connected to each other via an Xn interface. BS20 may be connected to each other via a fifth generation (5G) core network (5GC) and an NG interface. More specifically, BS20 may be connected to an access and mobility management function (AMF) 30 via an NG-C interface, and may be connected to a user plane function (UPF) 30 via an NG-U interface.

[0060] Figure 3 The functional division between NG-RAN and 5GC according to an embodiment of the present disclosure is shown.

[0061] Reference Figure 3 , gNB can provide functions such as inter-cell radio resource management (inter-cell RRM), radio bearer (RB) control, connection mobility control, radio admission control, measurement configuration and provision, dynamic resource allocation, etc. AMF can provide functions such as non-access stratum (NAS) security, idle state mobility processing, etc. UPF can provide functions such as mobility anchoring, protocol data unit (PDU) processing, etc. Session management function (SMF) can provide functions such as user equipment (UE) Internet protocol (IP) address allocation, PDU session control, etc.

[0062] The radio interface protocol layer between the UE and the network can be classified into the first layer (L1), the second layer (L2), and the third layer (L3) based on the lower three layers of the open system interconnection (OSI) model known in the communication system. Here, the physical (PHY) layer belonging to the first layer provides an information transmission service using a physical channel, and the radio resource control (RRC) layer located at the third layer controls radio resources between the UE and the network. To this end, the RRC layer exchanges RRC messages between the UE and the BS layer.

[0063] Figure 4a and Figure 4b A radio protocol architecture according to an embodiment of the present disclosure is shown. Figure 4a and Figure 4b The embodiments of can be combined with various embodiments of the present disclosure. Specifically, Figure 4a shows the radio protocol architecture for the user plane, and Figure 4b The radio protocol architecture for the control plane is shown. The user plane corresponds to a protocol stack for user data transmission, and the control plane corresponds to a protocol stack for control signal transmission.

[0064] Reference Figure 4a and Figure 4b , the physical layer provides information transfer services to the upper layer through a physical channel. The physical layer is connected to the medium access control (MAC) layer, which is the upper layer of the physical layer, through a transport channel. Data is transferred between the MAC layer and the physical layer through the transport channel. Transport channels are classified according to how data is sent through the radio interface and what characteristics the data has to be sent through the radio interface.

[0065] Data is transmitted through a physical channel between different PHY layers (ie, a PHY layer of a transmitter and a PHY layer of a receiver). The physical channel may be modulated using an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and uses time and frequency as radio resources.

[0066] The MAC layer provides services to the Radio Link Control (RLC) layer via logical channels, and the RLC layer is a higher layer of the MAC layer. The MAC layer provides a function of mapping multiple logical channels to multiple transport channels. The MAC layer also provides a function of logical channel multiplexing by mapping multiple logical channels to a single transport channel. The MAC layer provides data transmission services through logical channels.

[0067] The RLC layer performs concatenation, segmentation, and reassembly of Radio Link Control Service Data Units (RLC SDUs). In order to ensure different Quality of Service (QoS) required by Radio Bearers (RBs), the RLC layer provides three types of operation modes, namely, Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). AM RLC provides error correction through Automatic Repeat Request (ARQ).

[0068] The Radio Resource Control (RRC) layer is defined only in the control plane. And, the RRC layer performs the function of controlling physical channels, transport channels, and logical channels related to configuration, reconfiguration, and release of radio bearers. RB refers to a logical path provided by the first layer (i.e., the PHY layer) and the second layer (i.e., the MAC layer, the RLC layer, and the PDCP layer) to transmit data between the UE and the network.

[0069] The functions of the Packet Data Convergence Protocol (PDCP) in the user plane include transmission, header compression and encryption of user data. The functions of the Packet Data Convergence Protocol (PDCP) in the control plane include transmission and encryption / integrity protection of control plane data.

[0070] The Service Data Adaptation Protocol (SDAP) layer is defined only in the user plane. The SDAP layer performs mapping between Quality of Service (QoS) flows and Data Radio Bearers (DRBs) and QoS Flow ID (QFI) marking in both DL and UL packets.

[0071] Configuration of RB refers to the process for specifying radio protocol layers and channel attributes to provide a specific service and for determining corresponding detailed parameters and operation methods. RB can then be classified into two types, namely, signaling radio bearer (SRB) and data radio bearer (DRB). SRB is used as a path for sending RRC messages in the control plane, and DRB is used as a path for sending user data in the user plane.

[0072] When the RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in the RRC connected (RRC_CONNECTED) state, otherwise the UE can be in the RRC idle (RRC_IDLE) state. In the case of NR, the RRC inactive (RRC_INACTIVE) state is additionally defined, and the UE in the RRC_INACTIVE state can maintain the connection with the core network and release its connection with the BS.

[0073] The downlink transmission channels for sending (or transmitting) data from the network to the UE include a broadcast channel (BCH) for sending system information and a downlink shared channel (SCH) for sending other user services or control messages. The services or control messages of downlink multicast or broadcast services can be sent via the downlink SCH or can be sent via a separate downlink multicast channel (MCH). In addition, the uplink transmission channels for sending (or transmitting) data from the UE to the network include a random access channel (RACH) for sending initial control messages and an uplink shared channel (SCH) for sending other user services or control messages.

[0074] Examples of logical channels belonging to a higher layer of a transport channel and mapped to a transport channel may include a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), a multicast traffic channel (MTCH), etc.

[0075] The physical channel is configured by multiple OFDM symbols in the time domain and multiple subcarriers in the frequency domain. A subframe is configured by multiple OFDM symbols in the time domain. A resource block is configured by multiple subcarriers and multiple OFDM symbols in a resource allocation unit. In addition, each subframe can use a specific subcarrier of a specific OFDM symbol (e.g., the first OFDM symbol) of the corresponding subframe of the physical downlink control channel (PDCCH), i.e., the L1 / L2 control channel. The transmission time interval (TTI) refers to the unit time of subframe transmission.

[0076] Figure 5 The structure of the NR system according to an embodiment of the present disclosure is shown. Figure 5 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0077] Reference Figure 5 In NR, a radio frame can be used to perform uplink and downlink transmissions. The length of a radio frame is 10ms and can be defined as consisting of two half frames (HF). A half frame can include five 1ms subframes (SF). A subframe (SF) can be divided into one or more time slots, and the number of time slots within a subframe can be determined according to the subcarrier spacing (SCS). Each time slot can include 12 or 14 OFDM (A) symbols depending on the cyclic prefix (CP).

[0078] When a normal CP is used, each time slot may include 14 symbols. When an extended CP is used, each time slot may include 12 symbols. Herein, a symbol may include an OFDM symbol (or a CP-OFDM symbol) and a single carrier-FDMA (SC-FDMA) symbol (or a discrete Fourier transform spread OFDM (DFT-s-OFDM) symbol).

[0079] The following table 1 shows the number of time slots (N) of each symbol according to the SCS setting (μ) when the normal CP is adopted. slot symb ), the number of time slots per frame (N frame,μ slot ) and the number of time slots per subframe (N subframe,μ slot ).

[0080] [Table 1]

[0081] <![CDATA[SCS(15*2 μ )]]> <![CDATA[N slot symb ]]> <![CDATA[N frame,μ slot ]]> <![CDATA[N subframe,μ slot ]]> 15KHz(μ=0) 14 10 1 30KHz(μ=1) 14 20 2 60KHz(μ=2) 14 40 4 120KHz(μ=3) 14 80 8 240KHz(μ=4) 14 160 16

[0082] Table 2 shows an example of the number of symbols per slot, the number of slots per frame, and the number of slots per subframe according to the SCS in the case of using the extended CP.

[0083] [Table 2]

[0084] <![CDATA[SCS(15*2 μ )]]> <![CDATA[N slot symb ]]> <![CDATA[N frame,μ slot ]]> <![CDATA[N subframe,μ slot ]]> 60KHz(μ=2) 12 40 4

[0085] In the NR system, OFDM (A) parameter sets (e.g., SCS, CP length, etc.) between multiple cells integrated into one UE may be configured differently. Therefore, the (absolute time) duration (or interval) of a time resource (e.g., a subframe, a time slot, or a TTI) (collectively referred to as a time unit (TU) for simplicity) consisting of the same number of symbols may be configured differently in the integrated cells.

[0086] In NR, multiple parameter sets or SCSs can be supported to support various 5G services. For example, with an SCS of 15kHz, a wide range of traditional cellular bands can be supported, and with an SCS of 30kHz / 60kHz, dense cities, lower latency, and wider carrier bandwidths can be supported. With an SCS of 60kHz or higher, bandwidths greater than 24.25GHz can be used to overcome phase noise.

[0087] The NR frequency band may be defined as two different types of frequency ranges. The two different types of frequency ranges may be FR1 and FR2. The values ​​of the frequency ranges may be changed (or varied), for example, the two different types of frequency ranges may be as shown in Table 3 below. Among the frequency ranges used in the NR system, FR1 may mean "a range below 6 GHz", and FR2 may mean "a range above 6 GHz", and may also be referred to as millimeter wave (mmW).

[0088] [Table 3]

[0089] Frequency range specification Corresponding frequency range Subcarrier Spacing (SCS) FR1 450MHz–6000MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

[0090] As described above, the value of the frequency range in the NR system may be changed (or varied). For example, as shown in Table 4 below, FR1 may include a bandwidth in the range of 410 MHz to 7125 MHz. More specifically, FR1 may include frequency bands of 6 GHz (or 5850, 5900, 5925 MHz, etc.) and higher. For example, the frequency bands of 6 GHz (or 5850, 5900, 5925 MHz, etc.) and higher included in FR1 may include unlicensed frequency bands. Unlicensed frequency bands may be used for various purposes, for example, unlicensed frequency bands are used for vehicle-specific communications (e.g., autonomous driving).

[0091] [Table 4]

[0092]

[0093]

[0094] Figure 6 The structure of the time slot of the NR frame according to an embodiment of the present disclosure is shown.

[0095] Reference Figure 6 , a time slot includes multiple symbols in the time domain. For example, in the case of normal CP, one time slot may include 14 symbols. For example, in the case of extended CP, one time slot may include 12 symbols. Alternatively, in the case of normal CP, one time slot may include 7 symbols. However, in the case of extended CP, one time slot may include 6 symbols.

[0096] A carrier includes multiple subcarriers in the frequency domain. A resource block (RB) can be defined as multiple consecutive subcarriers in the frequency domain (e.g., 12 subcarriers). A bandwidth part (BWP) can be defined as multiple consecutive (physical) resource blocks ((P)RBs) in the frequency domain, and a BWP can correspond to a parameter set (e.g., SCS, CP length, etc.). A carrier can include up to N BWPs (e.g., 5 BWPs). Data communication can be performed via an activated BWP. Each element can be referred to as a resource element (RE) in a resource grid, and a complex symbol can be mapped to each element.

[0097] In addition, the radio interface between a UE and another UE or the radio interface between a UE and a network may include an L1 layer, an L2 layer, and an L3 layer. In various embodiments of the present disclosure, the L1 layer may refer to a physical layer. In addition, for example, the L2 layer may refer to at least one of a MAC layer, an RLC layer, a PDCP layer, and an SDAP layer. In addition, for example, the L3 layer may refer to an RRC layer.

[0098] Hereinafter, the bandwidth part (BWP) and the carrier will be described in detail.

[0099] A BWP may be a contiguous set of physical resource blocks (PRBs) within a given parameter set. A PRB may be selected from a contiguous set of common resource blocks (CRBs) for a given parameter set on a given carrier.

[0100] When bandwidth adaptation (BA) is used, the reception bandwidth and transmission bandwidth of the user equipment (UE) are not required to be as wide (or large) as the bandwidth of the cell, and the reception bandwidth and transmission bandwidth of the UE can be controlled (or adjusted). For example, the UE can receive information / configuration for bandwidth control (or adjustment) from the network / base station. In this case, bandwidth control (or adjustment) can be performed based on the received information / configuration. For example, bandwidth control (or adjustment) can include a reduction / expansion of bandwidth, a change in the position of bandwidth, or a change in the subcarrier spacing of bandwidth.

[0101] For example, the bandwidth can be reduced during a duration with little activity in order to save power. For example, the location of the bandwidth can be relocated (or moved) from the frequency domain. For example, the location of the bandwidth can be relocated (or moved) from the frequency domain to enhance scheduling flexibility. For example, the subcarrier spacing of the bandwidth can be changed. For example, the subcarrier spacing of the bandwidth can be changed to authorize different services. A subset of the total cell bandwidth of a cell can be referred to as a bandwidth part (BWP). BA can be performed when the base station / network configures a BWP for the UE and when the base station / network notifies the UE of the BWP that is currently activated among the BWPs.

[0102] For example, the BWP may be one of an activated BWP, an initial BWP, and / or a default BWP. For example, the UE cannot monitor the downlink radio link quality in a DL BWP other than an activated DL BWP within a primary cell (PCell). For example, the UE cannot receive PDCCH, PDSCH, or CSI-RS (except RRM) from outside an activated DL BWP. For example, the UE cannot trigger a channel state information (CSI) report for an unactivated DL BWP. For example, the UE cannot send a PUCCH or PUSCH from outside an unactivated DL BWP. For example, in the case of a downlink, the initial BWP may be given as a continuous RB set for an RMSI CORESET (configured by the PBCH). For example, in the case of an uplink, an initial BWP may be given by the SIB for a random access procedure. For example, a default BWP may be configured by a higher layer. For example, the initial value of the default BWP may be an initial DL BWP. In order to save energy, if the UE fails to detect DCI within a predetermined time period, the UE may switch the UE's activated BWP to a default BWP.

[0103] In addition, a BWP can be defined for SL. The same SL BWP can be used for transmission and reception. For example, a transmitting UE can send a SL channel or a SL signal within a specific BWP, and a receiving UE can receive a SL channel or a SL signal within the same specific BWP. In a licensed carrier, the SL BWP can be defined separately from the Uu BWP, and the SL BWP can have configuration signaling separate from the Uu BWP. For example, the UE can receive a configuration for the SL BWP from the base station / network. The SL BWP can be configured (in advance) for NR V2X UEs and RRC_IDLE UEs out of coverage. For UEs operating in RRC_CONNECTED mode, at least one SL BWP can be activated within the carrier.

[0104] Figure 7 An example of a BWP according to an embodiment of the present disclosure is shown. Figure 7 The embodiments of can be combined with various embodiments of the present disclosure. Figure 7 In an implementation manner, the number of BWPs is 3.

[0105] Reference Figure 7 , a common resource block (CRB) may be a carrier resource block numbered from one end of a carrier frequency band to the other end thereof. Additionally, a PRB may be a resource block numbered within each BWP. Point A may indicate a common reference point of a resource block grid.

[0106] It can be obtained by point A, the offset relative to point A (N start BWP ) and bandwidth (N size BWP ) to configure the BWP. For example, point A may be an external reference point of the PRBs of the carrier, and subcarrier 0 of all parameter sets (e.g., all parameter sets supported by the network on the corresponding carrier) are aligned in point A. For example, the offset may be the PRB distance between the lowest subcarrier within a given parameter set and point A. For example, the bandwidth may be the number of PRBs within a given parameter set.

[0107] Hereinafter, V2X or SL communication will be described.

[0108] Figure 8a and Figure 8b A radio protocol architecture for SL communication based on an embodiment of the present disclosure is shown. Figure 8a and Figure 8b The embodiments of can be combined with various embodiments of the present disclosure. More specifically, Figure 8a shows the user plane protocol stack, and Figure 8b The control plane protocol stack is shown.

[0109] Hereinafter, a side link synchronization signal (SLSS) and synchronization information will be described.

[0110] The SLSS may include a primary sublink synchronization signal (PSSS) and a secondary sublink synchronization signal (SSSS) as SL specific sequences. The PSSS may be referred to as a sublink primary synchronization signal (S-PSS), and the SSSS may be referred to as a sublink secondary synchronization signal (S-SSS). For example, an M sequence of length 127 may be used for the S-PSS, and a Gold sequence of length 127 may be used for the S-SSS. For example, the UE may use the S-PSS for initial signal detection and for synchronization acquisition. For example, the UE may use the S-PSS and the S-SSS for acquiring detailed synchronization and for detecting a synchronization signal ID.

[0111] The physical sidelink broadcast channel (PSBCH) can be a (broadcast) channel for sending default (system) information, which the UE must first know before SL signal transmission / reception. For example, the default information can be information related to SLSS, duplex mode (DM), time division duplex (TDD) uplink / downlink (UL / DL) configuration, information related to resource pool, type of application related to SLSS, subframe offset, broadcast information, etc. For example, in order to evaluate PSBCH performance, in NR V2X, the payload size of PSBCH can be 56 bits, including 24-bit CRC.

[0112] S-PSS, S-SSS, and PSBCH may be included in a block format that supports periodic transmission (e.g., SL synchronization signal (SS) / PSBCH block, hereinafter, sublink synchronization signal block (S-SSB)). The S-SSB may have the same parameter set (i.e., SCS and CP length) as the physical sublink control channel (PSCCH) / physical sublink shared channel (PSSCH) in the carrier, and the transmission bandwidth may exist within the (pre) configured sublink (SL) BWP. For example, the S-SSB may have a bandwidth of 11 resource blocks (RBs). For example, the PSBCH may exist across 11 RBs. In addition, the frequency position of the S-SSB may be (pre) configured. Therefore, the UE does not have to perform hypothesis detection at the frequency to discover the S-SSB in the carrier.

[0113] Fig. 9 A UE performing V2X or SL communication according to an embodiment of the present disclosure is shown. Fig. 9 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0114] Reference Fig. 9In V2X or SL communication, the term "UE" may generally refer to a user's UE. However, if a network device such as a BS transmits / receives signals according to a communication scheme between UEs, the BS may also be regarded as a type of UE. For example, UE 1 may be a first device 100, and UE 2 may be a second device 200.

[0115] For example, UE 1 may select a resource unit corresponding to a specific resource in a resource pool that means a collection of a series of resources. In addition, UE 1 may send an SL signal by using the resource unit. For example, a resource pool in which UE 1 can send a signal may be configured to UE 2 as a receiving UE, and a signal of UE 1 may be detected in the resource pool.

[0116] Herein, if UE 1 is within the connection range of the BS, the BS may inform the resource pool to UE 1. Otherwise, if UE 1 is out of the connection range of the BS, another UE may inform UE 1 of the resource pool, or UE 1 may use a pre-configured resource pool.

[0117] Generally, a resource pool may consist of multiple resource units, and each UE may select one or more resource units for its SL signal transmission.

[0118] Hereinafter, resource allocation in SL will be described.

[0119] Fig.10a and Fig.10b A process in which a UE according to an embodiment of the present disclosure performs V2X or SL communication based on a transmission mode is shown. Fig.10a and Fig.10b The embodiments of the present disclosure may be combined with various embodiments of the present disclosure. In various embodiments of the present disclosure, the transmission mode may be referred to as a mode or a resource allocation mode. Hereinafter, for ease of explanation, in LTE, the transmission mode may be referred to as an LTE transmission mode. In NR, the transmission mode may be referred to as an NR resource allocation mode.

[0120] For example, Fig.10a UE operations related to LTE transmission mode 1 or LTE transmission mode 3 are shown. Alternatively, for example, Fig.10a UE operations related to NR resource allocation mode 1 are shown. For example, LTE transmission mode 1 can be applied to conventional SL communication, and LTE transmission mode 3 can be applied to V2X communication.

[0121] For example, Fig.10b UE operations related to LTE transmission mode 2 or LTE transmission mode 4 are shown. Alternatively, for example, Fig.10b UE operations associated with NR resource allocation mode 2 are shown.

[0122] Reference Fig.10a , in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, the BS may schedule SL resources to be used by the UE for SL transmission. For example, the BS may perform resource scheduling for UE 1 through PDCCH (more specifically, downlink control information (DCI)), and UE 1 may perform V2X or SL communication for UE 2 according to the resource scheduling. For example, UE 1 may transmit sidelink control information (SCI) to UE 2 through a physical sidelink control channel (PSCCH), and thereafter transmit data based on the SCI to UE 2 through a physical sidelink shared channel (PSSCH).

[0123] Reference Fig.10b , in LTE transmission mode 2, LTE transmission mode 4 or NR resource allocation mode 2, the UE can determine the SL transmission resources within the SL resources configured by the BS / network or the pre-configured SL resources. For example, the configured SL resources or the pre-configured SL resources may be a resource pool. For example, the UE may autonomously select or schedule resources for SL transmission. For example, the UE may perform SL communication by autonomously selecting resources in the configured resource pool. For example, the UE may autonomously select resources within a selection window by performing a sensing and resource (re)selection process. For example, sensing may be performed in units of subchannels. In addition, UE 1, which has autonomously selected resources within the resource pool, may send SCI to UE 2 via PSCCH, and may thereafter send data based on the SCI to UE 2 via PSSCH.

[0124] Figures 11a to 11c Three types of broadcasts based on embodiments of the present disclosure are shown. Figures 11a to 11c The embodiments of can be combined with various embodiments of the present disclosure. Specifically, Fig.11a shows a broadcast type SL communication, Fig.11b shows a unicast type SL communication, and Fig.11c A multicast type SL communication is shown. In the case of a unicast type SL communication, the UE can perform one-to-one communication with another UE. In the case of a multicast type SL transmission, the UE can perform SL communication with one or more UEs in the group to which the UE belongs. In various embodiments of the present disclosure, the SL groupcast communication may be replaced by SL multicast communication, SL one-to-many communication, and the like.

[0125] In addition, in SL communication, the UE needs to efficiently select resources for SL transmission. Hereinafter, based on various embodiments of the present disclosure, a method for the UE to efficiently select resources for SL transmission and a device supporting the method will be described. In various embodiments of the present disclosure, SL communication may include V2X communication.

[0126] At least one of the methods proposed in various embodiments of the present disclosure may be applied to at least one of unicast communication, multicast communication and / or broadcast communication.

[0127] At least one of the methods proposed based on various embodiments of the present disclosure can be applied not only to SL communication or V2X communication based on PC5 interface or SL interface (for example, PSCCH, PSSCH, PSBCH, PSSS / SSSS, etc.), but also to SL communication or V2X communication based on Uu interface (for example, PUSCH, PDSCH, PDCCH, PUCCH, etc.).

[0128] In various embodiments of the present disclosure, the receiving operation of the UE may include a decoding operation and / or a receiving operation of a SL channel and / or a SL signal (e.g., PSCCH, PSSCH, PSFCH, PSBCH, PSSS / SSSS, etc.). The receiving operation of the UE may include a decoding operation and / or a receiving operation of a WAN DL channel and / or a WAN DL signal (e.g., PDCCH, PDSCH, PSS / SSS, etc.). The receiving operation of the UE may include a sensing operation and / or a channel busy ratio (CBR) measurement operation. In various embodiments of the present disclosure, the sensing operation of the UE may include a PSSCH-RSRP measurement operation based on a PSSCH DM-RS sequence, a PSSCH-RSRP measurement operation based on a PSSCH DM-RS sequence successfully decoded by the UE and scheduled by the PSCCH, a side link RSSI (S-RSSI) measurement operation, and / or an S-RSSI measurement operation based on a subchannel related to a V2X resource pool. In various embodiments of the present disclosure, the transmission operation of the UE may include the transmission operation of the SL channel and / or the SL signal (e.g., PSCCH, PSSCH, PSFCH, PSBCH, PSSS / SSSS, etc.). The transmission operation may include the transmission operation of the WAN UL channel and / or the WAN UL signal (e.g., PUSCH, PUCCH, SRS, etc.). In various embodiments of the present disclosure, the synchronization signal may include SLSS and / or PSBCH.

[0129] In various embodiments of the present disclosure, configuration may include signaling, signaling from the network, configuration from the network, and / or pre-configuration from the network. In various embodiments of the present disclosure, definition may include signaling, signaling from the network, configuration from the network, and / or pre-configuration from the network. In various embodiments of the present disclosure, specification may include signaling, signaling from the network, configuration from the network, and / or pre-configuration from the network.

[0130] In various embodiments of the present disclosure, the ProSe per-packet priority (PPPP) may be replaced by the ProSe per-packet reliability (PPPR), and the PPPR may be replaced by the PPPP. For example, when the PPPP value becomes smaller, this may indicate a high priority, and when the PPPP value becomes larger, this may indicate a low priority. For example, when the PPPR value becomes smaller, this may indicate a high reliability, and when the PPPR value becomes larger, this may indicate a low reliability. For example, the PPPP value associated with a service, packet, or message associated with a high priority may be smaller than the PPPP value associated with a service, packet, or message associated with a low priority. For example, the PPPR value associated with a service, packet, or message associated with a high reliability may be smaller than the PPPR value associated with a service, packet, or message associated with a low reliability.

[0131] In various embodiments of the present disclosure, a session may include at least one of a unicast session (e.g., a unicast session for SL), a groupcast / multicast session (e.g., a multicast / multicast session for SL), and / or a broadcast session (e.g., a broadcast session for SL).

[0132] In various embodiments of the present disclosure, a carrier may be replaced with at least one of a BWP and / or a resource pool, or vice versa. For example, a carrier may include at least one of a BWP and / or a resource pool. For example, a carrier may include one or more BWPs. For example, a BWP may include one or more resource pools.

[0133] The sidelink synchronization signal block (S-SSB) or sidelink SS / PSBCH block for initial access of the UE in the NR V2X communication system may include a sidelink primary synchronization signal (S-PSS), a sidelink secondary synchronization signal (S-SSS) and a sidelink physical broadcast channel (PSBCH). The UE may use the S-PSS to obtain initial signal detection and synchronization. The UE may use the S-SSS together with the S-PSS to obtain detailed synchronization and detect the synchronization signal ID. The PSBCH may be a channel for the UE to receive basic system information through the master information block (MIB). Therefore, the S-PSS, S-SSS and PSBCH included in the synchronization signal block may be important signals for the UE to obtain synchronization and basic system information, and for normal data communication, the UE may have to initially receive and decode the S-SSB. The transmitting UE may generate the PSBCH, for example, by the following processing ((1) to (8)).

[0134] (1) The upper layer generates the MIB and transmits it to the AS layer

[0135] (2) Generate PSBCH payload by adding information generated by the AS layer

[0136] (3) Primary PSBCH scrambling

[0137] (4) PSBCH channel coding (forward error correction)

[0138] (5) PSBCH rate matching (matching the amount of information with the size of the resources used for transmission)

[0139] (6) Auxiliary PSBCH scrambling

[0140] (7) PSBCH modulation

[0141] (8) Mapping PSBCH to resource elements

[0142] The transmitting UE can transmit the PSBCH generated through the above processes ((1) to (8)) to the receiving UE.

[0143] The scrambling process of the PSBCH by the transmitting UE has the purpose of reducing the peak-to-average power ratio (PAPR) of the OFDM signal and sending the time position and cell ID or SLSSID of the S-SSB to the receiving UE. The present disclosure proposes a method for effectively scrambling the PSBCH payload by the transmitting UE in the sidelink communication.

[0144] The transmitting UE can transmit, for example, the following information ((1) to (3)) to the receiving UE via the PSBCH.

[0145] (1) Time slot structure (TDD configuration)

[0146] (2) Frame number

[0147] (3) Time Slot Index

[0148] In the case where the Uu carrier and the SL carrier are shared, the time slot structure may represent configuration information for allocating UL, DL, SL and / or flexible time slots / symbols by the base station within a certain time period such as a frame. For example, the frame number may be information indicating the order of each frame in a superframe including 10240 frames. For example, if a frame has a duration of 1ms, the superframe occupies a duration of 10240ms, and the frame number may represent the time position of each frame within 10240ms. The time slot index may be information indicating the order of multiple time slots included in a frame. For example, in the case of a signal system with a subcarrier spacing of 15kHz / 30kHz / 60kHz / 120kHz, the number of time slots in a frame is 10 / 20 / 40 / 80, respectively, and a time slot may include 14 symbols. Therefore, the frame number may be configured as 10 bits, and the time slot index may be configured as 7 bits.

[0149] In the above embodiments, the MIB may include a time slot structure and a frame number (or the most significant bit (MSB) portion of the frame number), and the PSBCH payload other than the MIB includes a least significant bit (LSB) portion of the frame number and a time slot index (or the MSB portion of the time slot index). The LSB portion of the time slot index may be transmitted via a PSBCH demodulation reference signal (DM-RS) sequence for channel estimation required for PSBCH decoding.

[0150] Multiple S-SSBs may be transmitted within an S-SSB transmission period, and each S-SSB may be repeatedly transmitted within one period, or all PSBCH payloads may be divided and transmitted through different S-SSBs within one period.

[0151] A pseudo-random sequence can be used for the main scrambling performed before channel coding the PSBCH of the transmitting UE, and the sequence generation can be reset for each S-SSB starting point within an S-SSB transmission cycle, or it can be reset for each S-SSB transmission cycle. In this case, the initial value for sequence generation can be the SLSSID value, or can be determined by using the SLSSID value. The scrambling sequence for the PSBCH for each S-SSB can be generated by using an index representing the order of the S-SSBs or the number of information bits to which scrambling is applied, the index including the MIB and LSB portions of the time slot index to which the PSBCH is transmitted. In this case, scrambling is not applied to the index representing the order of the S-SSBs or the LSB portion of the time slot index to which the PSBCH is transmitted for sequence generation.

[0152] Alternatively, the same scrambling sequence may be applied to the PSBCH of all S-SSBs within one S-SSB period, or the same scrambling sequence may be applied to the PSBCH of all S-SSBs regardless of the S-SSB period. Accordingly, the receiver may improve channel decoding performance by combining codewords of repeatedly transmitted PSBCH of S-SSBs before channel decoding.

[0153] Alternatively, if a scrambling sequence is applied based on information such as an index indicating the order of S-SSBs or the LSB portion of a time slot index in which the PSBCH is transmitted, to which scrambling is determined, the receiver can determine / identify the scrambling sequence information applied by the transmitter before channel coding before performing channel decoding. For example, if polarization coding is used for channel coding, descrambling can be performed before channel coding when such scrambling sequence information is used. Accordingly, channel decoding performance can be improved by combining codewords to which different scrambling sequences are applied before channel coding. For example, since the index indicating the order of S-SSBs or the LSB portion of the time slot index is also used to generate the PSBCH DM-RS sequence, the corresponding information can be obtained through DM-RS detection.

[0154] A pseudo-random sequence may be used for auxiliary scrambling performed after channel coding the PSBCH of the transmitting UE, and the sequence generation may be reset for each S-SSB starting point within one S-SSB transmission cycle, or it may be reset for each S-SSB transmission cycle. In this case, the initial value for sequence generation may be a SLSSID value, or may be determined by using the SLSSID value. The scrambling sequence for the PSBCH for each S-SSB may be generated by using an index representing the order of the S-SSBs or the number of bits of the PSBCH codeword to which channel coding is applied and the LSB portion of the time slot index to which the PSBCH is transmitted. In this case, scrambling is not applied to the index representing the order of the S-SSBs used for sequence generation or the LSB portion of the time slot index to which the PSBCH is transmitted.

[0155] Alternatively, the same scrambling sequence may be applied to the PSBCH of all S-SSBs within one S-SSB period, or the same scrambling sequence may be applied to the PSBCH of all S-SSBs regardless of the S-SSB period. Accordingly, the receiver may obtain a combined gain for improving the signal-to-noise ratio of the received signal by combining the codewords of the PSBCH of the S-SSBs that are repeatedly transmitted.

[0156] Alternatively, if a scrambling sequence is applied based on information such as an index indicating the order of S-SSBs or the LSB portion of a slot index in which the PSBCH is transmitted, to which scrambling is not applied, since the receiver can confirm / identify the scrambling sequence information in advance, the receiver can perform descrambling for combining. For example, since the index indicating the order of S-SSBs or the LSB portion of the slot index is also used to generate the PSBCH DM-RS sequence, the corresponding information can be obtained through DM-RS detection.

[0157] Fig.12 An example of sending multiple S-SSBs within an S-SSB period is shown.

[0158] For example, a complete S-SSB signal may be transmitted in one time slot, and multiple S-SSBs transmitted in an S-SSB transmission period may be transmitted through continuous time slots in the time domain, and multiple S-SSBs transmitted in an S-SSB transmission period may be transmitted through time slots separated by a certain time interval in the time domain. In this case, (pre-) configuration of the base station may be performed. For example, the positions of continuous time slots may be configured by the base station, or the positions of time slots separated by a certain time interval may be configured by the base station, or information indicating a certain time interval may be signaled (or configured).

[0159] In another embodiment, a complete S-SSB signal can be sent in one time slot, and multiple S-SSBs sent in the S-SSB transmission period can be sent at any time slot position in the time domain. In this case, the position of the corresponding arbitrary time slot can be (pre-)configured by the base station.

[0160] According to the embodiment, the first device may receive information about the transmission resources of the sublink synchronization signal block (S-SSB) from the base station. Based on the information about the S-SSB transmission resources, the first device may determine a plurality of first time slots (time slot i+1, time slot i+1+N, time slot i+1+2N, ...) within the ASSB cycle 1210 of the S-SSB cycle length associated with the plurality of first S-SSBs 1212, 1214, 1216. The first device may send a plurality of first S-SSBs 1212, 1214, 1216 to the second device over a plurality of first time slots (time slot i+1, time slot i+1+N, time slot i+1+2N, ...). In this case, the time slot interval between the plurality of first time slots (time slot i+1, time slot i+1+N, time slot i+1+2N, ...) may be the same as the N time slot length within the AS-SSB cycle.

[0161] For example, information about S-SSB transmission resources may include information about time slot intervals.

[0162] For example, N in the time slot interval (N time slot length) can be 0 or a positive integer.

[0163] According to the embodiment, the first device can determine multiple first time slots (time slot i+1, time slot i+1+N, time slot i+1+2N, ...) separated by the time slot interval (N time slot length) and associated with multiple first S-SSBs 1212, 1214, 1216 based on information about the time slot interval (N time slot length).

[0164] For example, each of the plurality of first SSBs 1212, 1214, 1216 may include a physical sidelink broadcast channel (PSBCH). The PSBCH may be generated based on primary scrambling of the PSBCH and secondary scrambling of the PSBCH.

[0165] For example, primary scrambling of the PSBCH may be performed based on a pseudo-random sequence prior to PSBCH channel encoding.

[0166] For example, the generation of a scrambling sequence associated with primary scrambling or secondary scrambling may be reset for each start time of each transmission of the plurality of first S-SSBs 1212, 1214, 1216.

[0167] For example, the generation of the scrambling sequence associated with the primary scrambling or the secondary scrambling may be reset for each S-SSB cycle length. That is, after the A S-SSB cycle 1210, the generation of the scrambling sequence associated with the primary scrambling or the secondary scrambling may be reset, and after the B S-SSB cycle 1220, the generation of the scrambling sequence associated with the primary scrambling or the secondary scrambling may be reset.

[0168] For example, a time slot index for transmitting the PSBCH or at least one LSB representing an S-SSB index of each of the plurality of first S-SSBs 1212, 1214, 1216 may be used to generate a scrambling sequence for primary scrambling or secondary scrambling.

[0169] For example, scrambling may not be applied to at least one LSB of a slot index or an S-SSB index transmitting a PSBCH.

[0170] For example, the same scrambling sequence may be applied to multiple first PSBCHs included in multiple first S-SSBs 1212, 1214, 1216 within a first S-SSB period.

[0171] Based on the information about the S-SSB transmission resources, the first device according to the embodiment can determine multiple second time slots (time slot j+1, time slot j+1+N, time slot j+1+N, ...) within the Bth S-SSB cycle 1220 of the S-SSB cycle length associated with multiple second S-SSBs 1222, 1224, 1226, and can send multiple second S-SSBs 1222, 1224, 1226 to the second device on the multiple second time slots (time slot j+1, time slot j+1+N, time slot j+1+N, ...).

[0172] For example, in the case of multiple first PSBCHs included in multiple first SSBs within a first S-SSB period and multiple second PSBCHs included in multiple second SSBs within a second S-SSB period, the same scrambling sequence may be applied.

[0173] For example, all S-SSBs within an S-SSB transmission period can be transmitted within one frame. Accordingly, the frame number included in the MIB has the same value within the S-SSB transmission period, so that gain can be obtained by combining. In addition, the MSB part of the slot index transmitted by the PSBCH payload can be configured to have the same value within the S-SSB transmission period. For example, the MSB 4 bits of the slot index can be transmitted by the PSBCH payload, and the LSB 3 bits of the slot index can be transmitted by the PSBCH DM-RS, and all S-SSBs within one S-SSB transmission period can be transmitted through continuous time slots. In this case, if the first S-SSB is transmitted through a time slot having a slot index corresponding to a multiple of N (i.e., the number of S-SSBs transmitted within one S-SSB period), it is possible to combine because the MSB 4 bits of the slot index transmitted by the PSBCH within one S-SSB transmission period have the same value. In addition, since the order of each S-SSB within one S-SSB period is determined in sequence from 0 to (N-1) by the LSB portion of the slot index, a receiver that detects any S-SSB can determine the number of S-SSBs to be received thereafter. Accordingly, the receiver can avoid performing unnecessary blind detection for S-SSB detection.

[0174] In the above embodiment, if the position of the time slot in which the first S-SSB is transmitted is arbitrarily determined within the frame, combining is not possible because the MSB part of the time slot index transmitted through the PSBCH payload within one S-SSB transmission period does not have the same value. In this case, bundling can be selectively performed only for MIB information that maintains the same value within the corresponding period. In this case, if all S-SSBs are transmitted continuously within one S-SSB transmission period, the period for transmitting the S-SSB within the S-SSB transmission period is signaled by higher layer signaling, so that a receiver that detects any S-SSB can identify / determine the number of S-SSBs to be received thereafter.

[0175] The present disclosure proposes an efficient scrambling scheme suitable for PSBCH transmission.The proposed PSBCH scrambling scheme has the following advantages: PSBCH decoding performance is improved by combining PSBCHs transmitting the same PSBCH payload for each of the PSBCH scramblings applied before and after channel coding.

[0176] Fig.13 A method in which a first device sends a PSBCH to a second device based on an embodiment of the present disclosure is shown.

[0177] Reference Fig.13, in step S1310, the first device may generate a PSBCH. For example, the PSBCH may be generated based on the various methods proposed in the present disclosure. For example, generating the PSBCH may include generating a PSBCH payload, performing primary PSBCH scrambling, performing PSBCH channel coding, performing PSBCH rate matching, secondary PSBCH scrambling, performing PSBCH modulation, and / or mapping the PSBCH to at least one of resource elements. For example, the first device may perform primary PSBCH scrambling based on the various methods proposed in the present disclosure. For example, the first device may perform secondary PSBCH scrambling based on the various methods proposed in the present disclosure.

[0178] In step S1320, the first device may send the PSBCH to the second device.

[0179] Various embodiments proposed in the present disclosure may be applied to the devices described below. First, a processor of a first device may generate a PSBCH. In addition, the processor of the first device may control a transceiver to send the PSBCH to a second device.

[0180] Fig.14 A method for a second device to receive a PSBCH from a first device according to an embodiment of the present disclosure is shown.

[0181] Reference Fig.14 , in step S1410, the second device may receive the PSBCH from the first device.

[0182] For example, the first device may generate the PSBCH based on the various methods proposed in the present disclosure. For example, the generation of the first device may include generating a PSBCH payload, performing primary PSBCH scrambling, performing PSBCH channel coding, performing PSBCH rate matching, performing secondary PSBCH scrambling, performing PSBCH modulation, and / or mapping the PSBCH to at least one of resource elements. For example, the first device may perform primary PSBCH scrambling based on the various methods proposed in the present disclosure. For example, the first device may perform secondary PSBCH scrambling based on the various methods proposed in the present disclosure.

[0183] Various embodiments proposed in the present disclosure may be applied to the devices described below. The processor of the second device may control the transceiver to receive the PSBCH from the first device.

[0184] Fig.15 The operation of the first device according to the embodiment of the present disclosure is shown.

[0185] It can be implemented in combination with various embodiments of the present disclosure. Fig.15 For example, based on Figures 17 to 22At least one of the devices illustrated in the example is performed Fig.15 The operations disclosed in the flowchart are as follows. For example, Fig.15 The first device in the embodiment may be the one described later. Fig.18 In another example, Fig.15 The first device in the embodiment may be the one described later. Fig.18 The second wireless device 200 in.

[0186] In step S1510, the first device according to the embodiment may receive information about a sidelink synchronization signal block (S-SSB) transmission resource from a base station.

[0187] In step S1520, the first device according to the embodiment can determine a plurality of first time slots within a first S-SSB cycle of an S-SSB cycle length associated with a plurality of first S-SSBs based on information about S-SSB transmission resources.

[0188] In step S1530, the first device according to the embodiment may send a plurality of first S-SSBs to the second device over a plurality of first time slots.

[0189] For example, within the first S-SSB cycle, the time slot intervals between multiple first time slots may be the same.

[0190] For example, information about S-SSB transmission resources may include information about time slot intervals.

[0191] The first device according to the embodiment may determine a plurality of first time slots separated by time slot intervals associated with a plurality of first S-SSBs based on information about the time slot intervals.

[0192] For example, each of the plurality of first SSBs may include a physical sidelink broadcast channel (PSBCH).The PSBCH may be generated based on primary scrambling of the PSBCH and secondary scrambling of the PSBCH.

[0193] For example, generation of a scrambling sequence associated with primary scrambling or secondary scrambling may be reset for each start time of transmission of each of the plurality of first S-SSBs.

[0194] For example, the generation of the scrambling sequence associated with the primary scrambling or the secondary scrambling may be reset for each S-SSB cycle length.

[0195] For example, at least one LSB of the time slot index of the transmitted PSBCH or the S-SSB index representing each of the plurality of first S-SSBs may be used to generate a scrambling sequence associated with primary scrambling or secondary scrambling. Scrambling may not be applied to at least one LSB of the time slot index or the S-SSB index of the transmitted PSBCH.

[0196] For example, the same scrambling sequence may be applied to multiple first PSBCHs included in multiple first S-SSBs within a first S-SSB period.

[0197] According to the embodiment, the first device can determine a plurality of second time slots within a second S-SSB cycle of an S-SSB cycle length associated with a plurality of second S-SSBs based on information about S-SSB transmission resources. In addition, the first device can send a plurality of second S-SSBs to the second device over a plurality of second time slots. For example, the same scrambling sequence can be applied to a plurality of first PSBCHs included in a plurality of first SSBs within a first S-SSB cycle and a plurality of second PSBCHs included in a plurality of second SSBs within a second S-SSB cycle.

[0198] For example, all PSBCH payloads of the PSBCH for multiple first S-SSBs may be divided into multiple first S-SSBs.

[0199] For example, multiple first S-SSBs within a first S-SSB cycle may be sent to the second device via consecutive time slots. For example, the minimum index value among the time slot index values ​​of multiple first time slots in which multiple first S-SSBs may be sent is a multiple of the total number of first S-SSBs.

[0200] Based on an embodiment of the present disclosure, a first device configured to perform side link (SL) communication may be provided. The first device may include: at least one memory storing instructions; at least one transceiver; and at least one processor connecting at least one memory and at least one transceiver. The at least one processor may execute instructions to: receive information about side link synchronization signal block (S-SSB) transmission resources from a base station; determine multiple first time slots within a first S-SSB cycle of an S-SSB cycle length associated with multiple first S-SSBs based on the information about the S-SSB transmission resources; send multiple first S-SSBs to a second device on multiple first time slots, wherein, within the first S-SSB cycle, the time slot intervals between the multiple first time slots are the same.

[0201] Based on the embodiments of the present disclosure, a device (or chip (set)) configured to control a first user equipment (UE) may be provided. The device may include: at least one processor; and at least one memory connected to the at least one processor and storing instructions. The at least one processor may execute instructions to: receive information about a secondary link synchronization signal block (S-SSB) transmission resource from a base station; determine a plurality of first time slots within a first S-SSB cycle of an S-SSB cycle length associated with a plurality of first S-SSBs based on the information about the S-SSB transmission resource; send a plurality of first S-SSBs to a second UE on the plurality of first time slots, wherein, within the first S-SSB cycle, the time slot intervals between the plurality of first time slots are the same.

[0202] For example, the first UE of this embodiment may refer to the first device described in the present disclosure. For example, each of at least one processor and at least one memory in a device configured to control the first UE may be implemented as a separate sub-chip, or at least two or more components may be implemented by one sub-chip.

[0203] Based on the embodiments of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. When the instructions are executed, the first device may: receive information about a sublink synchronization signal block (S-SSB) transmission resource from a base station; determine a plurality of first time slots within a first S-SSB cycle of an S-SSB cycle length associated with a plurality of first S-SSBs based on the information about the S-SSB transmission resource; and send a plurality of first S-SSBs to a second device on the plurality of first time slots, wherein the time slot intervals between the plurality of first time slots within the first S-SSB cycle are the same.

[0204] Fig.16 The operation of the second device according to the embodiment of the present disclosure is shown.

[0205] It can be implemented in combination with various embodiments of the present disclosure. Fig.16 For example, based on Figures 17 to 22 At least one of the devices illustrated in the example is performed Fig.16 The operations disclosed in the flowchart are as follows. For example, Fig.16 The second device in the embodiment may be the one described later. Fig.18 In another example, Fig.16 The second device in the embodiment may be the one described later. Fig.18 A first wireless device 100 in.

[0206] In step S1610, the second device according to the embodiment may receive a plurality of first S-SSBs from the first device over a plurality of first time slots within a first S-SSB cycle of an S-SSB cycle length.

[0207] For example, the first device can determine multiple first time slots associated with multiple first S-SSBs based on the information about S-SSB transmission resources received by the first device from the base station.

[0208] For example, within the first S-SSB cycle, the time slot intervals between multiple first time slots may be the same.

[0209] For example, information about S-SSB transmission resources may include information about time slot intervals.

[0210] For example, each of the plurality of first SSBs may include a PSBCH.The PSBCH may be generated based on primary scrambling of the PSBCH and secondary scrambling of the PSBCH performed by the first device.

[0211] For example, a time slot index for transmitting the PSBCH or at least one LSB representing an S-SSB index of each of a plurality of first S-SSBs may be used for generating a scrambling sequence associated with primary scrambling or secondary scrambling performed by the first device.

[0212] For example, scrambling may not be applied to at least one LSB of a slot index or S-SSB index transmitting a PSBCH.

[0213] Based on the first device generating a scrambling sequence based on at least one LSB of the time slot index or S-SSB index of the transmitted PSBCH, the second device according to the embodiment can combine the codewords of the first PSBCH included in the received multiple first S-SSBs.

[0214] Based on an embodiment of the present disclosure, a second device configured to perform side link (SL) communication may be provided. The second device may include: at least one memory storing instructions; at least one transceiver; and at least one processor connected to the at least one memory and the at least one transceiver. The at least one processor may execute instructions to: receive a plurality of first S-SSBs from a first device on a plurality of first time slots within a first S-SSB cycle of an S-SSB cycle length, wherein the first device determines a plurality of first time slots associated with the plurality of first S-SSBs based on information about S-SSB transmission resources received by the first device from a base station, and wherein, within the first S-SSB cycle, the time intervals between the plurality of first time slots are the same.

[0215] Various embodiments of the present disclosure may be implemented independently. Alternatively, various embodiments of the present disclosure may be implemented by combination or merging. For example, although various embodiments of the present disclosure have been described based on the 3GPP LTE system for convenience of explanation, various embodiments of the present disclosure may also be applied extensively to another system other than the 3GPP LTE system. For example, various embodiments of the present disclosure may also be used in the case of uplink or downlink, and are not limited to direct communication between UEs. In this case, a base station, a relay node, etc. may use the proposed method according to various embodiments of the present disclosure. For example, it may be defined as reporting by a base station to a UE or by a sending UE to a receiving UE via predefined signaling (e.g., physical layer signaling or higher layer signaling) or reporting by a sending UE to a receiving UE information about whether the method according to various embodiments of the present disclosure is applied. For example, it may be defined as reporting by a base station to a UE or by a sending UE to a receiving UE information about rules according to various embodiments of the present disclosure via predefined signaling (e.g., physical layer signaling or higher layer signaling). For example, some of the various embodiments of the present disclosure may only be restrictedly applied to resource allocation mode 1. For example, some of the various embodiments of the present disclosure may only be restrictedly applied to resource allocation mode 2.

[0216] Hereinafter, devices to which respective embodiments of the present disclosure can be applied will be described.

[0217] The various descriptions, functions, processes, proposals, methods and / or operational flows of the present disclosure described in this document may be applied to, but not limited to, various fields requiring wireless communication / connection between devices (e.g., 5G).

[0218] Hereinafter, a description will be given in more detail with reference to the accompanying drawings. In the following drawings / descriptions, unless otherwise described, the same reference numerals may represent the same or corresponding hardware blocks, software blocks or functional blocks.

[0219] Fig.17 A communication system (1) according to an embodiment of the present disclosure is shown.

[0220] Reference Fig.17, a communication system (1) to which various embodiments of the present disclosure are applied includes a wireless device, a base station (BS), and a network. Herein, a wireless device refers to a device that performs communication using a radio access technology (RAT) (e.g., 5G new RAT (NR) or long term evolution (LTE)), and may be referred to as a communication / radio / 5G device. The wireless device may include, but is not limited to, a robot (100a), a vehicle (100b-1, 100b-2), an extended reality (XR) device (100c), a handheld device (100d), a home appliance (100e), an Internet of Things (IoT) device (100f), and an artificial intelligence (AI) device / server (400). For example, a vehicle may include a vehicle with a wireless communication function, an autonomous vehicle, and a vehicle capable of performing inter-vehicle communication. Herein, a vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). XR devices may include augmented reality (AR) / virtual reality (VR) / mixed reality (MR) devices and may be implemented in the form of head mounted devices (HMD), head up displays (HUD) installed in vehicles, televisions, smart phones, computers, wearable devices, home appliance devices, digital signage, vehicles, robots, etc. Handheld devices may include smart phones, smart boards, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebooks). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, a BS and a network may be implemented as wireless devices, and a specific wireless device (200a) may operate as a BS / network node relative to other wireless devices.

[0221] Herein, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may include, in addition to LTE, NR and 6G, a narrowband Internet of Things for low-power communication. In this case, for example, NB-IoT technology may be an example of a low-power wide area network (LPWAN) technology, and may be implemented as a standard such as LTE Cat NB1 and / or LTE CatNB2, and is not limited to the above names. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may perform communication based on LTE-M technology. In this case, as an example, LTE-M technology may be an example of LPWAN, and may be referred to as various names, including enhanced machine type communication (eMTC), etc. For example, LTE-M technology may be implemented as at least any of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE machine type communication and / or 7) LTE M, and is not limited to the above names. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may include at least one of Bluetooth, a low power wide area network (LPWAN), and ZigBee considering low power communication, and is not limited to the above names. As an example, the ZigBee technology may generate a personal area network (PAN) related to small / low power digital communication based on various standards including IEEE 802.15.4, etc., and may be referred to as various names.

[0222] The wireless devices 100a to 100f may be connected to the network 300 via the BS 200. The AI ​​technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI ​​server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other via the BS 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., sidelink communication) with each other without passing through the BS / network. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). An IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., a sensor) or other wireless devices 100a to 100f.

[0223] Wireless communication / connection 150a, 150b or 150c can be established between wireless devices 100a to 100f / BS200 or BS200 / BS200. Here, the wireless communication / connection can be established through various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication) or inter-BS communication (e.g., relay, integrated access backhaul (IAB)). The wireless device and the BS / wireless device can send / receive radio signals to / from each other through wireless communication / connection 150a and 150b. For example, wireless communication / connection 150a and 150b can send / receive signals through various physical channels. To this end, various configuration information configuration processes for sending / receiving radio signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation and resource mapping / demapping) and at least a portion of the resource allocation process can be performed based on various proposals of the present disclosure.

[0224] Fig.18 A wireless device according to an embodiment of the present disclosure is shown.

[0225] Reference Fig.18 , the first wireless device (100) and the second wireless device (200) may transmit radio signals via various RATs (e.g., LTE and NR). Herein, {the first wireless device (100) and the second wireless device (200)} may correspond to Fig.17 {wireless device (100x) and BS (200)} and / or {wireless device (100x) and wireless device (100x)}.

[0226] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may additionally further include one or more transceivers 106 and / or one or more antennas 108. The (one or more) processors 102 may control the (one or more) memories 104 and / or the (one or more) transceivers 106, and may be configured to implement the descriptions, functions, processes, proposals, methods and / or operation flows disclosed in this document. For example, the (one or more) processors 102 may process the information in the (one or more) memories 104 to generate first information / signals, and then send a radio signal including the first information / signals through the (one or more) transceivers 106. The (one or more) processors 102 may receive a radio signal including a second information / signal through the transceiver 106, and then store the information obtained by processing the second information / signals in the (one or more) memories 104. The (one or more) memories 104 may be connected to the (one or more) processors 102, and may store various information related to the operation of the (one or more) processors 102. For example, (one or more) memories 104 may store software code including commands for executing part or all of the processing controlled by (one or more) processors 102 or for executing the descriptions, functions, processes, proposals, methods and / or operational flows disclosed in this document. Here, (one or more) processors 102 and (one or more) memories 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). (One or more) transceivers 106 may be connected to (one or more) processors 102 and send and / or receive radio signals through (one or more) antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. (One or more) transceivers 106 may be used interchangeably with (one or more) radio frequency (RF) units. In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0227] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and may additionally further include one or more transceivers 206 and / or one or more antennas 208. The (one or more) processors 202 may control the (one or more) memories 204 and / or the (one or more) transceivers 206, and may be configured to implement the descriptions, functions, processes, proposals, methods and / or operation flows disclosed in this document. For example, the (one or more) processors 202 may process the information in the (one or more) memories 204 to generate third information / signals, and then transmit a radio signal including the third information / signals through the (one or more) transceivers 206. The (one or more) processors 202 may receive a radio signal including a fourth information / signal through the (one or more) transceivers 106, and then store the information obtained by processing the fourth information / signals in the (one or more) memories 204. The (one or more) memories 204 may be connected to the (one or more) processors 202, and may store various information related to the operation of the (one or more) processors 202. For example, (one or more) memories 204 may store software code including commands for executing part or all of the processing controlled by (one or more) processors 202 or for executing the descriptions, functions, processes, proposals, methods and / or operational flows disclosed in this document. Here, (one or more) processors 202 and (one or more) memories 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). (One or more) transceivers 206 may be connected to (one or more) processors 202 and transmit and / or receive radio signals through (one or more) antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. (One or more) transceivers 206 may be used interchangeably with (one or more) RF units. In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0228] Below, the hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by, but are not limited to, one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). One or more processors 102 and 202 may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the description, function, process, proposal, method, and / or operation flow disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data, or information according to the description, function, process, proposal, method, and / or operation flow disclosed in this document. One or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the description, function, process, proposal, method, and / or operation flow disclosed in this document, and provide the generated signals to one or more transceivers 106 and 206. One or more processors 102 and 202 can receive signals (e.g., baseband signals) from one or more transceivers 106 and 206 and obtain PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operating procedures disclosed in this document.

[0229] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) may be included in one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document may be implemented using firmware or software, and the firmware or software may be configured to include modules, processes, or functions. Firmware or software configured to execute the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document may be included in one or more processors 102 and 202 or stored in one or more memories 104 and 204, thereby being driven by one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document may be implemented using software or firmware in the form of code, commands, and / or command sets.

[0230] One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and may store various types of data, signals, messages, information, programs, codes, instructions, and / or commands. One or more memories 104 and 204 may be composed of read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard drive, registers, cash memory, computer-readable storage media, and / or combinations thereof. One or more memories 104 and 204 may be located inside and / or outside one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 via various technologies such as wired or wireless connections.

[0231] One or more transceivers 106 and 206 may send user data, control information, and / or radio signals / channels mentioned in the method and / or operation flow of this document to one or more other devices. One or more transceivers 106 and 206 may receive user data, control information, and / or radio signals / channels mentioned in the description, function, process, proposal, method, and / or operation flow disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202, and may send and receive radio signals. For example, one or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may send user data, control information, or radio signals to one or more other devices. One or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to send and receive user data, control information and / or radio signals / channels mentioned in the description, functions, processes, proposals, methods and / or operation flows disclosed in this document through one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert received radio signals / channels, etc. from RF band signals to baseband signals to process received user data, control information, radio signals / channels, etc. using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert user data, control information, radio signals / channels, etc. processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0232] Fig.19 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown.

[0233] Reference Fig.19 The signal processing circuit (1000) may include a scrambler (1010), a modulator (1020), a layer mapper (1030), a precoder (1040), a resource mapper (1050), and a signal generator (1060). Fig.19 Operation / function, not limited to Fig.18 The processor (102, 202) and / or the transceiver (106, 206) may be Fig.18The processor (102, 202) and / or the transceiver (106, 206) are implemented Fig.19 For example, you can Fig.18 The processor (102, 202) implements blocks 1010 to 1060. Alternatively, Fig.18 The processor (102, 202) implements blocks 1010 to 1050 and can be implemented by Fig.18 The transceiver (106, 206) is used to implement box 1060.

[0234] Can be through Fig.19 The signal processing circuit (1000) converts the codeword into a radio signal. Herein, the codeword is a coded bit sequence of an information block. The information block may include a transport block (e.g., UL-SCH transport block, DL-SCH transport block). The radio signal may be transmitted through various physical channels (e.g., PUSCH and PDSCH).

[0235] Specifically, the codeword can be converted into a scrambled bit sequence by the scrambler 1010. The scrambling sequence for scrambling can be generated based on an initial value, and the initial value can include the ID information of the wireless device. The scrambled bit sequence can be modulated into a modulation symbol sequence by the modulator 1020. The modulation scheme may include pi / 2-binary phase shift keying (pi / 2-BPSK), m-phase shift keying (m-PSK) and m-quadrature amplitude modulation (m-QAM). The complex modulation symbol sequence can be mapped to one or more transmission layers by the layer mapper 1030. The modulation symbol of each transmission layer can be mapped (precoded) to (one or more) corresponding antenna ports by the precoder 1040. The output z of the precoder 1040 can be obtained by multiplying the output y of the layer mapper 1030 with the N*M precoding matrix W. Here, N is the number of antenna ports and M is the number of transmission layers. The precoder 1040 can perform precoding after performing transform precoding (e.g., DFT) for the complex modulation symbol. Alternatively, the precoder 1040 may perform precoding without performing transform precoding.

[0236] The resource mapper 1050 may map the modulation symbols of each antenna port to time-frequency resources. The time-frequency resources may include multiple symbols in the time domain (e.g., CP-OFDMA symbols and DFT-s-OFDMA symbols) and multiple subcarriers in the frequency domain. The signal generator 1060 may generate a radio signal from the mapped modulation symbols, and the generated radio signal may be sent to other devices through each antenna. To this end, the signal generator 1060 may include an inverse fast Fourier transform (IFFT) module, a cyclic prefix (CP) inserter, a digital-to-analog converter (DAC), and an up-converter.

[0237] Can be used with Fig.19 The signal processing process for the signal received in the wireless device is configured in a manner opposite to the signal processing process (1010-1060) of the wireless device. Fig.18 100, 200) can receive a radio signal from the outside through an antenna port / transceiver. The received radio signal can be converted into a baseband signal by a signal restorer. To this end, the signal restorer may include a frequency downlink converter, an analog-to-digital converter (ADC), a CP remover, and a fast Fourier transform (FFT) module. Next, the baseband signal can be restored to a codeword through a resource demapping process, a post-coding process, a demodulation processor, and a descrambling process. The codeword can be restored to the original information block by decoding. Therefore, a signal processing circuit (not illustrated) for receiving a signal may include a signal restorer, a resource demapper, a post-encoder, a demodulator, a descrambler, and a decoder.

[0238] Fig. 20 Another example of a wireless device according to an embodiment of the present disclosure is shown. The wireless device can be implemented in various forms according to use cases / services (see Fig.17 ).

[0239] Reference Fig. 20 , the wireless device (100, 200) may correspond to Fig.18 The wireless devices (100, 200) may be configured by various elements, components, units / portions and / or modules. For example, each of the wireless devices (100, 200) may include a communication unit (110), a control unit (120), a storage unit (130) and additional components (140). The communication unit may include a communication circuit (112) and (one or more) transceivers (114). For example, the communication circuit (112) may include Fig.18 One or more processors (102, 202) and / or one or more memories (104, 204) of the present invention. For example, the transceiver(s) (114) may include Fig.18The control unit (120) is electrically connected to the communication unit (110), the storage unit (130) and the additional components (140), and controls the overall operation of the wireless device. For example, the control unit (120) can control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the storage unit (130). The control unit (120) can send the information stored in the storage unit (130) to the outside (e.g., other communication devices) via the communication unit (110) through a wireless / wired interface, or store the information received from the outside (e.g., other communication devices) via the communication unit (110) through a wireless / wired interface in the storage unit (130).

[0240] The additional component (140) may be configured in various ways depending on the type of the wireless device. For example, the additional component (140) may include at least one of a power unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device may be implemented in the following forms without limitation: a robot ( Fig.17 100a), vehicles ( Fig.17 100b-1 and 100b-2), XR devices ( Fig.17 100c), handheld device ( Fig.17 100d), household appliances ( Fig.17 100e), IoT devices ( Fig.17 100f), digital broadcast terminal, hologram device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate / environmental device, AI server / device ( Fig.17 400), BS( Fig.17 200), network nodes, etc. Depending on the use case / service, the wireless device can be used in a mobile or fixed place.

[0241] exist Fig. 20In the wireless device (100, 200), all the various elements, components, units / parts and / or modules in the wireless device (100, 200) can be connected to each other through a wired interface, or at least part of them can be connected wirelessly through the communication unit (110). For example, in each of the wireless devices (100, 200), the control unit (120) and the communication unit (110) can be connected by wire, and the control unit (120) and the first unit (e.g., 130, 140) can be connected wirelessly through the communication unit (110). Each element, component, unit / part and / or module in the wireless device (100, 200) can also include one or more elements. For example, the control unit (120) can be constructed by a collection of one or more processors. As an example, the control unit (120) can be constructed by a collection of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit and a memory control processor. As another example, the storage unit (130) may be constructed by a random access memory (RAM), a dynamic RAM (DRAM), a read only memory (ROM), a flash memory, a volatile memory, a nonvolatile memory, and / or a combination thereof.

[0242] Hereinafter, the implementation will be described in detail with reference to the accompanying drawings. Fig. 20 .

[0243] Fig.21 A handheld device according to an embodiment of the present disclosure is shown. The handheld device may include a smart phone, a smart pad, a wearable device (e.g., a smart watch or smart glasses), or a portable computer (e.g., a notebook). The handheld device may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT).

[0244] Reference Fig.21 The handheld device (100) may include an antenna unit (108), a communication unit (110), a control unit (120), a storage unit (130), a power supply unit (140a), an interface unit (140b) and an I / O unit (140c). The antenna unit (108) may be configured as a part of the communication unit (110). Blocks 110 to 130 / 140a to 140c correspond to Fig. 20 Frame 110 to 130 / 140.

[0245] The communication unit 110 may send and receive signals (e.g., data signals and control signals) to and from other wireless devices or BSs. The control unit 120 may perform various operations by controlling the constituent elements of the handheld device 100. The control unit 120 may include an application processor (AP). The storage unit 130 may store data / parameters / programs / codes / commands required to drive the handheld device 100. The storage unit 130 may store input / output data / information. The power supply unit 140a may supply power to the handheld device 100 and include a wired / wireless charging circuit, a battery, etc. The interface unit 140b may support the connection of the handheld device 100 to other external devices. The interface unit 140b may include various ports (e.g., audio I / O ports and video I / O ports) for connecting to external devices. The I / O unit 140c may input or output video information / signals, audio information / signals, data and / or information input by a user. The I / O unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker and / or a tactile module.

[0246] For example, in the case of data communication, the I / O unit 140c can obtain information / signals (e.g., touch, text, voice, image, or video) input by the user, and the obtained information / signals can be stored in the storage unit 130. The communication unit 110 can convert the information / signals stored in the memory into radio signals, and directly send the converted radio signals to other wireless devices or to the BS. The communication unit 110 can receive radio signals from other wireless devices or BSs, and then restore the received radio signals to the original information / signals. The restored information / signals can be stored in the storage unit 130, and can be output as various types (e.g., text, voice, image, video, or tactile) through the I / O unit 140.

[0247] Fig. 22 A vehicle or autonomous vehicle according to an embodiment of the present disclosure is shown. The vehicle or autonomous vehicle may be implemented by a mobile robot, a car, a train, a manned / unmanned aerial vehicle (AV), a ship, etc.

[0248] Reference Fig. 22 The vehicle or autonomous vehicle (100) may include an antenna unit (108), a communication unit (110), a control unit (120), a drive unit (140a), a power supply unit (140b), a sensor unit (140c) and an autonomous driving unit (140d). The antenna unit (108) may be configured as a part of the communication unit (110). Blocks 110 / 130 / 140a to 140d correspond to Fig. 20 Frame 110 / 130 / 140.

[0249] The communication unit 110 may send and receive signals (e.g., data signals and control signals) to and from external devices such as other vehicles, BSs (e.g., gNBs and roadside units), and servers. The control unit 120 may perform various operations by controlling elements of the vehicle or autonomous vehicle 100. The control unit 120 may include an electronic control unit (ECU). The drive unit 140a may cause the vehicle or autonomous vehicle 100 to travel on the road. The drive unit 140a may include an engine, a motor, a transmission system, wheels, brakes, a steering device, etc. The power supply unit 140b may supply power to the vehicle or autonomous vehicle 100, and may include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c may acquire vehicle status, external environment information, user information, etc. The sensor unit 140c may include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor, a heading sensor, a position module, a vehicle forward / reverse sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, a lighting sensor, a pedal position sensor, etc. The autonomous driving unit 140d may implement a technology for maintaining a lane in which the vehicle is traveling, a technology for automatically adjusting a speed (e.g., adaptive cruise control), a technology for autonomously driving along a determined path, a technology for driving by automatically setting a path when a destination is set, and the like.

[0250] For example, the communication unit 110 may receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d may generate an autonomous driving path and a driving plan from the acquired data. The control unit 120 may control the drive unit 140a so that the vehicle or the autonomous driving vehicle 100 may move along the autonomous driving path according to the driving plan (e.g., speed / direction control). In the middle of autonomous driving, the communication unit 110 may aperiodically / periodically acquire the most recent traffic information data from an external server and acquire surrounding traffic information data from adjacent vehicles. In the middle of autonomous driving, the sensor unit 140c may acquire vehicle status and / or surrounding environment information. The autonomous driving unit 140d may update the autonomous driving path and driving plan based on the newly acquired data / information. The communication unit 110 may transmit information about the vehicle position, autonomous driving path, and / or driving plan to an external server. The external server may predict traffic information data using AI technology, etc. based on information collected from the vehicle or autonomous driving vehicle, and provide the predicted traffic information data to the vehicle or autonomous driving vehicle.

[0251] The scope of the present disclosure may be indicated by the appended claims, and it should be understood that all variations or modifications derived from the meaning and scope of the claims and their equivalents may be included in the scope of the present disclosure.

[0252] The claims in this specification may be combined in various ways. For example, the technical features in the method claims of this specification may be combined to be implemented or performed in a device, and the technical features in the device claims may be combined to be implemented or performed in a method. In addition, the technical features in (one or more) method claims and (one or more) device claims may be combined to be implemented or performed in a device. In addition, the technical features in (one or more) method claims and (one or more) device claims may be combined to be implemented or performed in a method.

Claims

1. A method performed by a first device, the method comprising the following steps: Obtaining information about a secondary link synchronization signal block S-SSB transmission resource; determining a plurality of first time slots within a first S-SSB cycle of an S-SSB cycle length associated with a plurality of first S-SSBs based on the information about the S-SSB transmission resource; as well as transmitting the plurality of first S-SSBs to a second device over the plurality of first time slots, wherein, within the first S-SSB cycle, the time slot intervals between the multiple first time slots are constant, wherein each of the plurality of first S-SSBs comprises a physical sidelink broadcast channel PSBCH, wherein the PSBCH is generated based on scrambling the PSBCH, and wherein, based on the secondary link synchronization signal SLSS identification ID, the generator of the scrambling sequence of the PSBCH is initialized at the beginning of each of the plurality of first S-SSBs in the first S-SSB period, and Among them, the same scrambling sequence generated based on the SLSSID is applied to the multiple first PSBCHs included in the multiple first S-SSBs within the first S-SSB period.

2. The method according to claim 1, wherein: The information about the S-SSB transmission resources includes information about the time slot interval.

3. The method according to claim 2, wherein: The step of determining the plurality of first time slots includes determining the plurality of first time slots separated by the time slot interval and associated with the plurality of first S-SSBs based on information about the time slot interval.

4. The method according to claim 1, wherein: The generation of a scrambling sequence associated with the scrambling is reset for each start time of transmission of each of the plurality of first S-SSBs.

5. The method according to claim 1, wherein: For each S-SSB period length, the generation of the scrambling sequence associated with the scrambling is reset.

6. The method according to claim 1, wherein: At least one LSB representing an S-SSB index of each of the plurality of first S-SSBs or an index of a slot in which the PSBCH is transmitted is used to generate a scrambling sequence associated with primary scrambling or secondary scrambling, and Wherein, scrambling is not applied to the S-SSB index or the at least one LSB of the time slot index in which the PSBCH is transmitted.

7. The method according to claim 1, further comprising the steps of: determining a plurality of second time slots within a second S-SSB cycle of the S-SSB cycle length associated with a plurality of second S-SSBs based on the information about the S-SSB transmission resources; as well as transmitting the plurality of second S-SSBs to the second device over the plurality of second time slots, Among them, the same scrambling sequence is applied to the multiple first PSBCHs included in the multiple first S-SSBs in the first S-SSB period and the multiple second PSBCHs included in the multiple second S-SSBs in the second S-SSB period.

8. The method according to claim 1, wherein: All PSBCH payloads of the PSBCH for the multiple first S-SSBs are divided into the multiple first S-SSBs.

9. The method according to claim 1, wherein: The plurality of first S-SSBs in the first S-SSB period are transmitted to the second device via consecutive time slots, and Among them, the minimum index value among the time slot index values ​​of the multiple first time slots for sending the multiple first S-SSBs is a multiple of the total number of the first S-SSBs.

10. A first device, comprising: at least one memory storing instructions; at least one transceiver; as well as at least one processor connected to the at least one memory and the at least one transceiver, wherein the at least one processor executes the instructions to: Obtaining information about a secondary link synchronization signal block S-SSB transmission resource; determining a plurality of first time slots within a first S-SSB cycle of an S-SSB cycle length associated with a plurality of first S-SSBs based on the information about the S-SSB transmission resource; and transmitting the plurality of first S-SSBs to a second device within the plurality of first time slots, wherein, within the first S-SSB cycle, the time slot intervals between the multiple first time slots are constant, wherein each of the plurality of first S-SSBs comprises a physical sidelink broadcast channel PSBCH, wherein the PSBCH is generated based on scrambling the PSBCH, and wherein, based on the secondary link synchronization signal SLSS identification ID, the generator of the scrambling sequence of the PSBCH is initialized at the beginning of each of the plurality of first S-SSBs in the first S-SSB period, and Among them, the same scrambling sequence generated based on the SLSSID is applied to the multiple first PSBCHs included in the multiple first S-SSBs within the first S-SSB period.

11. The first device according to claim 10, wherein: The information about the S-SSB transmission resources includes information about the time slot interval.

12. The first device according to claim 11, wherein: Determining the plurality of first time slots includes determining the plurality of first time slots separated by the time slot interval and associated with the plurality of first S-SSBs based on information about the time slot interval.

13. A device configured to control a first user equipment UE, the device comprising: at least one processor; as well as at least one memory coupled to the at least one processor and storing instructions, wherein the at least one processor executes the instructions to: Obtaining information about a secondary link synchronization signal block S-SSB transmission resource; determining a plurality of first time slots within a first S-SSB cycle of an S-SSB cycle length associated with a plurality of first S-SSBs based on the information about the S-SSB transmission resource; and sending the plurality of first S-SSBs to a second UE on the plurality of first time slots, wherein, within the first S-SSB cycle, the time slot intervals between the multiple first time slots are constant, wherein each of the plurality of first S-SSBs comprises a physical sidelink broadcast channel PSBCH, wherein the PSBCH is generated based on scrambling the PSBCH, and wherein, based on the secondary link synchronization signal SLSS identification ID, the generator of the scrambling sequence of the PSBCH is initialized at the beginning of each of the plurality of first S-SSBs in the first S-SSB period, and Among them, the same scrambling sequence generated based on the SLSSID is applied to the multiple first PSBCHs included in the multiple first S-SSBs within the first S-SSB period.

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