Method and apparatus for transmitting DMRS for PSSCH in NR V2X

Abstract

A method for wireless communication by a first device is proposed. The method may include the following steps: sending a demodulation reference signal (DMRS) pattern-related information to a second device via a physical sublink control channel (PSCCH); mapping the DMRS to a resource related to a physical sublink shared channel (PSSCH) related to the PSCCH based on the information related to the DMRS pattern and the length of a symbol duration of the PSSCH; and sending the DMRS to the second device via the PSSCH.

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 the vehicle queuing, the vehicles can move together by dynamically forming a group. For example, in order to perform a queuing operation based on the vehicle queuing, the vehicles belonging to the group can receive periodic data from the leading vehicle. For example, the vehicles belonging to the group can reduce or increase the interval between the 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] In addition, in order to improve the utilization efficiency of data resources, for the NR system, it is possible to support a form in which resources for the physical sublink control channel (PSCCH) are superimposed on resources for the physical sublink shared channel (PSSCH) or resources for the PSCCH are surrounded by resources for the PSSCH.

[0016] In this case, for example, when the length of the symbol duration of the PSCCH is relatively longer than the length of the symbol duration of the control resource set (CORESET) for the downlink, if the transmitting terminal does not map the PSSCH demodulation reference signal (DMRS) in the PSSCH resource of the PSCCH frequency division multiplexing (FDM) area, the PSSCH detection performance of the receiving terminal may be degraded. In addition, for example, when the PSCCH is time division multiplexed (TDM) with the PSSCH, if the PSSCH DMRS is not mapped after the resources related to the PSCCH, the detection performance of the PSSCH of the receiving terminal may be degraded.

[0017] Technical Solution

[0018] According to an embodiment of the present disclosure, a method for performing wireless communication by a first device is provided. The method may include the following steps: sending sublink control information (SCI) including information related to a demodulation reference signal (DMRS) pattern to a second device through a physical sublink control channel (PSCCH); mapping the DMRS to resources related to the PSSCH based on the information related to the DMRS pattern and the length of the symbol duration of the PSSCH related to the PSCCH; and sending the DMRS to the second device through the PSSCH.

[0019] Technical Effects

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

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

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

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

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

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

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

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

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

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

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

[0031] Fig.11 Three broadcast types are shown according to embodiments of the present disclosure.

[0032] Fig.12 A synchronization source or synchronization reference of V2X based on an embodiment of the present disclosure is shown.

[0033] Fig.13 An example of resource allocation for a data channel or a control channel based on an embodiment of the present disclosure is shown.

[0034] Fig.14 An example of symbols related to a secondary link in a secondary link time slot according to an embodiment of the present disclosure is shown.

[0035] Fig.15 An example of mapping type A and mapping type B of a PDSCH or a PUSCH according to an embodiment of the present disclosure is shown.

[0036] Fig.16 An example of a region where FDM is performed on a PSCCH and a PSSCH according to an embodiment of the present disclosure is shown.

[0037] Fig.17 The diagram shows a process in which a transmitting terminal that has determined and / or allocated resources for a PSSCH DMRS performs secondary link communication with a receiving terminal according to an embodiment of the present disclosure.

[0038] Fig.18 An example of DMRS mapping to PUSCH resources according to an embodiment of the present disclosure is shown.

[0039] Fig.19 An example is shown in which resources related to the PSSCH are divided into two RB groups or sub-channel groups according to an embodiment of the present disclosure.

[0040] Fig. 20 A case where there is a transient period between a symbol duration in a region where the PSCCH and the PSSCH are frequency-division multiplexed with each other and a symbol duration in a region where only the PSSCH is transmitted according to an embodiment of the present disclosure is shown.

[0041] Fig.21 The diagram shows a process in which a transmitting terminal sends a DMRS to a receiving terminal through a PSSCH according to an embodiment of the present disclosure.

[0042] Fig. 22 A method in which a first device transmits a DMRS to a second device through a PSSCH according to an embodiment of the present disclosure is shown.

[0043] Fig.23 A method in which a second device receives a DMRS from a first device through a PSSCH according to an embodiment of the present disclosure is shown.

[0044] Fig.24 A method in which a first device transmits a PSSCH DMRS to a second device through a PSSCH according to an embodiment of the present disclosure is shown.

[0045] Fig.25 A communication system 1 according to an embodiment of the present disclosure is shown.

[0046] Fig.26 A wireless device according to an embodiment of the present disclosure is shown.

[0047] Fig. 27 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown.

[0048] Fig.28 A wireless device according to an embodiment of the present disclosure is shown.

[0049] Fig.29 A handheld device according to an embodiment of the present disclosure is shown.

[0050] Fig.30 An automobile or autonomous vehicle according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0051] 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".

[0052] 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".

[0053] 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".

[0054] 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".

[0055] 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".

[0056] The technical features described in each of the drawings in this specification may be implemented separately or simultaneously.

[0057] 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. IEEE802.16m 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] Figure 3 The functional division between NG-RAN and 5GC according to an embodiment of the present disclosure is shown.

[0064] 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.

[0065] 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.

[0066] Figure 4 A radio protocol architecture according to an embodiment of the present disclosure is shown. Figure 4The embodiments of can be combined with various embodiments of the present disclosure. Specifically, Figure 4 (a) shows the radio protocol architecture for the user plane, and Figure 4 (b) in FIG. 4 shows a radio protocol architecture for a control plane. The user plane corresponds to a protocol stack for user data transmission, and the control plane corresponds to a protocol stack for control signal transmission.

[0067] Reference Figure 4 , the physical layer provides information transfer services to the upper layer through the physical channel. The physical layer is connected to the medium access control (MAC) layer, which is the upper layer of the physical layer, through the transport channel. Data is transferred between the MAC layer and the physical layer through the transport channel. The transport channel is classified according to how the data is transmitted through the radio interface and what characteristics of the data it transmits.

[0068] 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.

[0069] 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.

[0070] 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).

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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).

[0081] 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).

[0082] Table 1 below shows the number of time slots (N) of each symbol according to the SCS setting (μ) when the normal CP is used. slot symb ), the number of time slots per frame (N frame,μ slot ) and the number of time slots per subframe (N subframe,μ slot ).

[0083] [Table 1]

[0084] <![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

[0085] 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.

[0086] [Table 2]

[0087] <![CDATA[SCS(15*2 μ )]]> <![CDATA[N slot symb ]]> <![CDATA[N frame,μ slot ]]> <![CDATA[N subframe,μ slot <!-- 6 -->]]> 60KHz(μ=2) 12 40 4

[0088] 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.

[0089] 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.

[0090] 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).

[0091] [Table 3]

[0092] Frequency range specification Corresponding frequency range Subcarrier Spacing (SCS) FR1 450MHz-6000MHz 15, 30, 60kHz FR2 24250MHz-52600MHz 60, 120, 240kHz

[0093] 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).

[0094] [Table 4]

[0095] Frequency range specification Corresponding frequency range Subcarrier Spacing (SCS) FR1 410MHz-7125MHz 15, 30, 60kHz FR2 24250MHz-52600MHz 60, 120, 240kHz

[0096] Figure 6 The structure of the time slot of the NR frame according to an embodiment of the present disclosure is shown.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] Hereinafter, the bandwidth part (BWP) and the carrier will be described in detail.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] Figure 7 An example of a BWP according to an embodiment of the present disclosure is shown. Figure 7The embodiments of can be combined with various embodiments of the present disclosure. Figure 7 In an implementation manner, the number of BWPs is 3.

[0107] 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.

[0108] 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.

[0109] Hereinafter, V2X or SL communication will be described.

[0110] Figure 8 A radio protocol architecture for SL communication according to an embodiment of the present disclosure is shown. Figure 8 The embodiments of can be combined with various embodiments of the present disclosure. More specifically, Figure 8 (a) in FIG. 1 shows a user plane protocol stack, and Figure 8 (b) in FIG. 5 shows the control plane protocol stack.

[0111] Next, the sub-link synchronization signal (SLSS) and the synchronization information will be described in detail.

[0112] 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 secondary link primary synchronization signal (S-PSS), and the SSSS may be referred to as a secondary link secondary synchronization signal (S-SSS). For example, an M sequence of length 127 may be used for the S-PSS, and a Gold sequence of length 127 may be used for the S-SSS. For example, the UE may use the S-PSS for initial signal detection and synchronization acquisition. For example, the UE may use the S-PSS and the S-SSS for acquiring detailed synchronization and for detecting the synchronization signal ID.

[0113] The physical sidelink broadcast channel (PSBCH) can be a (broadcast) channel for sending default (system) information, which must be known by the UE 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.

[0114] 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 a (pre) configured sublink (SL) BWP. For example, the S-SSB may have a bandwidth of 11 resource blocks (SBs). 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.

[0115] Fig. 9 A UE performing V2X or SL communication according to an embodiment of the present disclosure is shown. Fig. 9 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0116] Reference Fig. 9 In 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 (first apparatus) 100, and UE 2 may be a second device (second apparatus) 200.

[0117] For example, UE 1 may select a resource unit corresponding to a specific resource in a resource pool meaning a set of resource series. In addition, UE 1 may send an SL signal by using the resource unit. For example, a resource pool in which UE 1 can send a signal may be configured to UE 2 as a receiving UE, and a signal of UE 1 may be detected in the resource pool.

[0118] 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.

[0119] Generally, a resource pool may be configured in units of multiple resources, and each UE may select one or more units of resources to use in its SL signaling.

[0120] Hereinafter, resource allocation in SL will be described.

[0121] Fig.10 A process of performing V2X or SL communication based on a transmission mode by a UE according to an embodiment of the present disclosure is shown. Fig.10 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure. In various embodiments of the present disclosure, the transmission mode may be referred to as a mode or a resource allocation mode. Hereinafter, for ease of explanation, in LTE, the transmission mode may be referred to as an LTE transmission mode. In NR, the transmission mode may be referred to as an NR resource allocation mode.

[0122] For example, Fig.10 (a) in FIG. 1 shows UE operations related to LTE transmission mode 1 or LTE transmission mode 3. Alternatively, for example, Fig.10 (a) in FIG. 1 shows UE operations related to NR resource allocation mode 1. For example, LTE transmission mode 1 may be applied to conventional SL communication, and LTE transmission mode 3 may be applied to V2X communication.

[0123] For example, Fig.10 (b) in FIG. 4 shows UE operations related to LTE transmission mode 2 or LTE transmission mode 4. Alternatively, for example, Fig.10 (b) in FIG. 1 shows UE operation related to NR resource allocation mode 2.

[0124] Reference Fig.10 In (a), in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, the BS may schedule SL resources to be used by the UE for SL transmission. For example, the BS may perform resource scheduling for UE 1 through PDCCH (more specifically, downlink control information (DCI)), and UE 1 may perform V2X or SL communication for UE 2 according to the resource scheduling. For example, UE 1 may send sidelink control information (SCI) to UE 2 through a physical sidelink control channel (PSCCH), and thereafter send data based on the SCI to UE 2 through a physical sidelink shared channel (PSSCH).

[0125] Reference Fig.10In (b), in LTE transmission mode 2, LTE transmission mode 4 or NR resource allocation mode 2, the UE can determine the SL transmission resources within the SL resources configured by the BS / network or the pre-configured SL resources. For example, the configured SL resources or the pre-configured SL resources can be a resource pool. For example, the UE can autonomously select or schedule resources for SL transmission. For example, the UE can perform SL communication by autonomously selecting resources in the configured resource pool. For example, the UE can autonomously select resources within the selection window by performing sensing and resource (re)selection processes. For example, sensing can be performed in units of subchannels. In addition, UE 1 that has autonomously selected resources in the resource pool can send SCI to UE 2 via PSCCH, and thereafter data based on the SCI can be sent to UE 2 via PSSCH.

[0126] Fig.11 Three playback types according to embodiments of the present disclosure are shown. Fig.11 The embodiments of can be combined with various embodiments of the present disclosure. Specifically, Fig.11 (a) shows broadcast type SL communication, Fig.11 (b) in FIG. 4 shows unicast type SL communication, and Fig.11 (c) shows multicast SL communication. In the case of unicast SL communication, the UE can perform one-to-one communication with another UE. In the case of multicast SL transmission, the UE can perform SL communication with one or more UEs in the group to which the UE belongs. In various embodiments of the present disclosure, SL groupcast communication can be replaced by SL multicast communication, SL one-to-many communication, etc.

[0127] In addition, in order to improve the utilization efficiency of data resources, for the NR system, it is possible to support a form in which resources for PSCCH are superimposed on resources for PSSCH or resources for PSCCH are surrounded by resources for PSSCH.

[0128] Fig.12 A synchronization source or synchronization reference of V2X based on an embodiment of the present disclosure is shown. Fig.12 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0129] refer to Fig.12 In V2X, the UE can synchronize directly with the Global Navigation Satellite System (GNSS), or can synchronize indirectly with the GNSS through a UE that synchronizes directly with the GNSS (within or outside the network coverage). If the GNSS is configured as a synchronization source, the UE can calculate the Direct Frame Number (DFN) and subframe number by using the Coordinated Universal Time (UTC) and a (pre-)configured Direct Frame Number (DFN) offset.

[0130] Alternatively, the UE may be synchronized directly with the BS, or may be synchronized with another UE that is time / frequency synchronized with the BS. For example, the BS may be an eNB or a gNB. For example, if the UE is within network coverage, the UE may receive synchronization information provided by the BS and may be synchronized directly with the BS. Thereafter, the UE may provide synchronization information to another adjacent UE. If the BS timing is configured based on synchronization, the UE may rely on a cell associated with the corresponding frequency (when it is within cell coverage at that frequency) or a primary cell or serving cell (when it is outside cell coverage at that frequency) for synchronization and downlink measurements.

[0131] The BS (e.g., serving cell) may provide synchronization configuration for the carrier used for V2X or SL communication. In this case, the UE may follow the synchronization configuration received from the BS. If the UE cannot detect any cell in the carrier used for V2X or SL communication and cannot receive the synchronization configuration from the serving cell, the UE may follow the pre-configured synchronization configuration.

[0132] Alternatively, the UE may be synchronized with another UE that cannot obtain synchronization information directly or indirectly from the BS or GNSS. The synchronization source or preference may be pre-configured for the UE. Alternatively, the synchronization source and preference may be configured through a control message provided by the BS.

[0133] The SL synchronization source may be associated / correlated with the synchronization priority. For example, the relationship between the synchronization source and the synchronization priority may be defined as shown in Table 5 or Table 6. Table 5 or Table 6 is for exemplary purposes only, and the relationship between the synchronization source and the synchronization priority may be defined in various forms.

[0134] [Table 5]

[0135]

[0136] [Table 6]

[0137]

[0138] In Table 5 or Table 6, P0 may represent the highest priority, and P6 may represent the lowest priority. In Table 5 or Table 6, the BS may include at least one of a gNB and an eNB.

[0139] It may be (pre-)configured whether GNSS based synchronization or BS based synchronization is used.In single carrier operation, the UE may derive the UE's transmit timing from the highest priority available synchronization reference.

[0140] In addition, in order to improve the utilization efficiency of data resources, for the NR system, it is possible to support a form in which resources for PSCCH are superimposed on resources for PSSCH or resources for PSCCH are surrounded by resources for PSSCH.

[0141] Fig.13 An example of resource allocation for a data channel or a control channel based on an embodiment of the present disclosure is shown. Fig.13 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0142] Reference Fig.13 , resources for control channels (e.g., PSCCH) may be allocated to UEs in a form (#S1, #S2, #S3) superimposed on resources for data channels (e.g., PSSCH). Alternatively, resources for control channels (e.g., PSCCH) may be allocated to UEs in a form (#S4) surrounded by resources for data channels (e.g., PSSCH).

[0143] In addition, the UE may map the DMRS associated with the PSSCH or the DMRS used to decode the PSSCH to the resources allocated for the PSSCH. For example, according to the multiplexing scheme of the PSCCH and the PSSCH, the corresponding DMRS may be mapped to not overlap with the position of the resource to which the PSCCH is mapped. For example, according to the multiplexing scheme of the PSCCH and the PSSCH, the corresponding DMRS may be mapped to the PUSCH resource area so as not to overlap with the position of the resource to which the PSCCH is mapped.

[0144] Fig.14 An example of symbols related to a secondary link in a secondary link time slot according to an embodiment of the present disclosure is shown. Fig.14 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0145] The size of the side link resource (e.g., the number of symbols that can be SL transmitted / received in one time slot) can be different between time slots. For example, since a flexible time slot format is supported in NR, the size of the side link resource can vary between time slots. Therefore, side link resources of different sizes for each time slot can be allocated to the UE.

[0146] For example, refer to Fig.14, there can be 7 symbols capable of side-link communication on SL slot #N, and there can be 3 symbols capable of side-link communication on SL slot #N+P. Therefore, the resource allocation method for PSSCH and / or the mapping position or method of the DMRS related to PSSCH can be changed. In this specification, for the sake of ease of description, the DMRS related to PSSCH or the DMRS used to decode PSSCH may be referred to as PSSCH DMRS. Similarly, the DMRS related to PDSCH or the DMRS used to decode PDSCH may be referred to as PDSCH DMRS, and the DMRS related to PUSCH or the DMRS used to decode PUSCH may be referred to as PUSCH DMRS.

[0147] Similarly, in the NR system, the number of symbols or the length of the symbol duration used for the transmission of the downlink PDSCH and the uplink PUSCH may vary. Accordingly, the location or configuration of the resources through which the DMRS is transmitted may be different according to the length of the symbol duration.

[0148] Fig.15 An example of mapping type A and mapping type B of a PDSCH or a PUSCH according to an embodiment of the present disclosure is shown. Fig.15 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0149] Reference Fig.15 For example, in the case of PDSCH mapping type A or PUSCH mapping type A, the PDSCH DMRS or PUSCH DMRS may be mapped to a specific position (e.g., a symbol corresponding to symbol index 2 or 3) based on a slot boundary (e.g., a starting point of a slot). Also, in the case of PDSCH mapping type A or PUSCH mapping type A, there may be a restriction that a starting symbol of a PDSCH resource must be determined so that the PDSCH resource includes a symbol to which the PDSCH DMRS is mapped, and there may be a restriction that a starting symbol of a PUSCH resource must be determined so that the PUSCH resource includes a symbol to which the PUSCH DMRS is mapped.

[0150] For example, in the case of PDSCH mapping type B or PUSCH mapping type B, the PDSCH DMRS or PUSCH DMRS may be mapped to the starting symbol of the PDSCH resource allocated for data transmission or the starting symbol of the PUSCH resource allocated for data transmission, or the PDSCH DMRS or PUSCH DMRS may be mapped to a specific position based on the starting symbol of the PDSCH resource or the starting symbol of the PUSCH resource. In addition, in the case of PDSCH mapping type B or PUSCH mapping type B, since the PDSCH DMRS and the PUSCH DMRS are each mapped to the first symbol of the allocated PDSCH resource or the first symbol of the allocated PUSCH resource, the restrictions on the starting symbol of the PDSCH resource or the starting symbol of the PUSCH resource may be relatively less than those of PDSCH mapping type A or PUSCH mapping type A. For example, in PDSCH mapping type B, the possible length of the PDSCH symbol duration may be limited to 2, 4, or 7 symbols (6 symbols in the case of extended CP). Fig.15 The embodiment shows the case where the length of the PDSCH symbol duration is 4 symbols in PDSCH mapping type B.

[0151] In addition, for example, if the PDSCH resources allocated in PDSCH mapping type B overlap with the resources reserved for the search space associated with a specific control resource set (CORESET), the first PDSCH DMRS can be reconfigured to be mapped to the symbol immediately after the corresponding CORESET. Even if the allocated PDSCH resources partially overlap with the CORESET in the frequency domain, this reconfiguration method of the mapping position of the PDSCH DMRS can be equally applied. Here, for example, the CORESET can be a set of time-frequency resources (e.g., a set of at least one resource block and at least one symbol) for sending DCI through the PDCCH. For example, the CORESET can be sent using a portion of the channel bandwidth.

[0152] In addition, for example, when the transmitting UE sends the PSSCH to the receiving UE, the receiving UE may perform an automatic gain control (AGC) operation in the first symbol of the PSSCH resource. Therefore, when the receiving UE uses the first symbol of the PSSCH resource for the AGC operation, if the transmitting UE maps the PSSCH DMRS to the first symbol of the PSSCH resource, the PSSCH detection performance of the receiving UE may be reduced.

[0153] In addition, for example, Fig.13In an embodiment, the PSCCH may be allocated and / or transmitted in an overlaid form on the PSSCH resources. In addition, for the downlink, the length of the symbol duration of the PSCCH may be relatively greater than the length of the symbol duration of the CORESET. In this case, if the transmitting UE does not map the PSSCH DMRS in the PSSCH resources of the PSCCH and FDM (frequency division multiplexing) area, the PSSCH detection performance of the receiving UE may be degraded if the transmitting UE does not map the PSSCH DMRS in the PSSCH resources of the PSCCH and frequency division multiplexing (FDM) area.

[0154] Fig.16 An example of a region where FDM is performed on a PSCCH and a PSSCH according to an embodiment of the present disclosure is shown. Fig.16 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0155] Reference Fig.16 , the FDM area indicates an area within the PSSCH resources where FDM is performed for the PSCCH. The transmitting UE needs to map the PSSCH DMRS to the resources of the FDM area in order to prevent the receiving UE from degrading the detection performance of the PSSCH. That is, in the side link communication, in order for the transmitting UE to efficiently send data to the receiving UE, the transmitting UE needs to determine the resources for the PSSCH and / or the resources for mapping the PSSCH DMRS. Hereinafter, a method for determining resources for mapping the PSSCH DMRS and a device supporting the method will be described according to various embodiments of the present disclosure.

[0156] Fig.17 The diagram shows a process in which a transmitting UE that has determined and / or allocated resources for a PSSCH DMRS performs secondary link communication with a receiving UE according to an embodiment of the present disclosure. Fig.17 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0157] Reference Fig.17 In step S1710, the sending UE may determine and / or allocate resources for the PSCCH.

[0158] According to an embodiment of the present disclosure, the transmitting UE can determine the position information of the PSSCH DMRS based on the position information of the PUSCH DMRS (for example, the position pattern of the PUSCH DMRS). More specifically, the position information of the PSSCH DMRS can be determined based on Table 7 or Table 8 related to the position information of the PUSCH DMRS. For example, in a single-symbol DMRS structure (that is, when the duration of one DMRS is one symbol), the position of the PSSCH DMRS can be determined based on Table 7. For example, in a dual-symbol DMRS structure (that is, when the duration of one DMRS is two symbols), the position of the PSSCH DMRS can be determined based on Table 8. In addition, if the resources used for the sub-link in the time slot are variable, the PSSCH DMRS structure can be determined based on the PUSCH mapping type B.

[0159] [Table 7]

[0160]

[0161] [Table 8]

[0162]

[0163] In order to determine the location information of the PSSCH DMRS based on the information of the PUSCH DMRS in Table 7 or Table 8 (eg, the location pattern of the PUSCH DMRS), it is necessary to define or (pre-) configure a method for defining or interpreting the PSSCH DMRS. d and l0. When the position information of the PSSCH DMRS is N, the actual PSSCH DMRS position can be determined as the position N symbols after the reference point. d The length of the symbol duration used as a reference (hereinafter, referred to as the length of the reference symbol duration) may be indicated. For example, 10 may indicate the symbol position of the first PSSCH DMRS. For example, dmrs-AdditionalPosition may indicate the number of PSSCH DMRS. However, l in Table 7 or Table 8 may indicate the length of the symbol duration used as a reference. d and l0 may be defined respectively for PSSCH DMRS.

[0164] Fig.18 An example in which a DMRS is mapped to a PUSCH resource according to an embodiment of the present disclosure is shown. Fig.18 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0165] For example, referring to Table 7, in the parameters for the position mode of the PUSCH DMRS, the PUSCH mapping type may be A, the dmrs-AdditionalPosition may be 3, and the dmrs-AdditionalPosition may be 1.d can be 12, and l0 can be 2. In this case, DMRS can be mapped to symbol indexes 2, 5, 8, and 11, and the pattern in which DMRS is mapped to PUSCH resources can be Fig.18 Similarly, for example, the PUSCH mapping type and the parameters for the location pattern of the PUSCH DMRS in Tables 7 and 8 (for example, l d , l0) to determine the location pattern of the PSSCH DMRS, and the DMRS may be mapped and transmitted on the PSSCH resource based on the location pattern of the PSSCH DMRS. For example, the PSSCH mapping type and the parameters for the location pattern of the PSCCH DMRS may be defined separately from the PUSCH mapping type and the parameters for the location pattern of the PUSCH DMRS of Tables 7 and 8 above (e.g., l d , l0) to determine the location pattern of the PSSCH DMRS, and the DMRS may be mapped and transmitted on the PSSCH resource based on the location pattern of the PSSCH DMRS. For example, the PSSCH mapping type and the parameters for the location pattern of the PSSCH DMRS may be defined separately from the PUSCH mapping type and the parameters for the location pattern of the PUSCH DMRS of Tables 7 and 8 above (e.g., l d , l0) determine the position pattern of the PSSCH DMRS, and the DMRS can be mapped and sent on the PSSCH resources based on the position pattern of the PSSCH DMRS.

[0166] Reference Fig.17 In step S1720, the transmitting UE may determine and / or allocate resources for the PSSCH based on the resources for the PSCCH. In step S1730, the transmitting UE may determine and / or allocate resources for mapping the PSSCH DMRS based on the resources for the PSSCH.

[0167] More specifically, considering Fig.13 The transmitting UE can determine the location information of the PSSCH DMRS in the form of the PSCCH superimposed on the PSSCH shown in FIG. 1. To this end, the transmitting UE can divide the resources related to the PSSCH into two resource block (RB) groups or subchannel groups in the frequency dimension.

[0168] Fig.19 An example is shown in which resources related to the PSSCH are divided into two RB groups or sub-channel groups according to an embodiment of the present disclosure. Fig.19 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0169] Reference Fig.19, the first RB group represents a set of RBs in an area where PSCCH and PSSCH are time division multiplexed (TDM) with each other. In addition, the second RB group represents a set of RBs in an area where only PSSCH is mapped in the absence of PSCCH. In the present specification, for the sake of ease of description, the set of RBs in an area where PSCCH and PSSCH are time division multiplexed with each other may be referred to as the first RB group, and the set of subchannels in an area where PSCCH and PSSCH are time division multiplexed with each other may be referred to as the first subchannel group. In addition, the set of RBs in an area where only PSSCH is mapped in the absence of PSCCH may be referred to as the second RB group, and the set of subchannels in an area where only PSSCH is mapped in the absence of PSCCH may be referred to as the second subchannel group. Hereinafter, a method for sending UE to divide PSSCH-related resources into a first RB group and a second RB group or a first subchannel group and a second subchannel group to determine the position information of PSSCH DMRS will be described.

[0170] For example, in the first RB group or the first subchannel group, the reference point can be (pre) configured as the symbol immediately after the last symbol to which the PSCCH is mapped. In addition, the reference point can be (pre) configured as the symbol after a specific offset (for example, an offset of 1) from the last symbol to which the PSCCH is mapped. Therefore, the PSSCH DMRS can be prevented from overlapping with the PSCCH resources. In this case, the symbol position of the first PSSCH DMRS can be (pre) configured as 0. Accordingly, the PSSCH DMRS can be mapped and transmitted directly after the resources related to the PSCCH transmission. In addition, the length of the reference symbol duration can be the length of the interval from the reference point to the last symbol of the allocated PSSCH resource. That is, the length of the reference symbol duration can be less than or equal to the length of the actually allocated PSSCH resources.

[0171] For example, in the first RB group or the first subchannel group, the reference point may be (pre) configured as the first symbol of the side link resource in the time slot or the first symbol of the allocated PSSCH resource. In this case, the symbol position of the first PSSCH DMRS may be (pre) configured as the symbol immediately after the last symbol of the PSCCH resource. Accordingly, the PSSCH DMRS may be sent immediately after the resources related to the PSCCH transmission. In addition, the length of the reference symbol duration may be the length of the interval from the reference point to the last symbol of the allocated PSSCH resource. Here, the DMRS mapping to the symbol position before the symbol position of the first PSSCH DMRS may be omitted. For example, when the position mode of the PSSCH DMRS is (pre) configured as 4 together with the symbol position of the first PSSCH DMRS, if the symbol position of the first PSSCH DMRS is greater than 4, the transmitting UE may only map the PSSCH DMRS to the symbol position of the first PSSCH DMRS.

[0172] For example, parameters related to PSSCH DMRS mapping in the second RB group or the second sub-channel group (e.g., reference point, symbol position of the first PSSCH DMRS, length of reference symbol duration) may be defined or (pre-) configured to be the same as the parameters related to PSSCH DMRS mapping in the first RB group or the first sub-channel group described above. In addition, when the transmitting UE maps PSSCH DMRS in the second RB group or the second sub-channel group, the position of the PSSCH DMRS may be fixed regardless of the position of the RB or the sub-channel.

[0173] Fig. 20 A case where there is a transient period between a symbol duration in a region where the PSCCH and the PSSCH are frequency-division multiplexed with each other and a symbol duration in a region where only the PSSCH is transmitted according to an embodiment of the present disclosure is shown. Fig. 20 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0174] Reference Fig. 20There may be a transient period between the symbol duration (e.g., first period) of a region where PSCCH and PSSCH are frequency division multiplexed (hereinafter, FDMed) with each other and the symbol duration (e.g., second period) of a region where only PSSCH is transmitted. For example, between the symbol duration (e.g., first period) of a region where PSCCH and PSSCH are FDMed with each other and the symbol duration (e.g., second period) of a region where only PSSCH is transmitted, when AGC for receiving UEs is required, phase continuity cannot be guaranteed between the symbol duration of a region where PSCCH and PSSCH are FDMed with each other in the time domain and the symbol duration of a region where only PSSCH is transmitted without PSCCH.

[0175] In addition, it may be difficult for the receiving UE to estimate the channel information of another symbol duration by using the PSSCH DMRS of a specific symbol duration. For example, it may be difficult for the receiving UE to estimate the channel information before the transient period by using the PSSCH DMRS of the symbol duration after the transient period. That is, when a transient period occurs, since the characteristics of the RF circuit may be different, the phase may change randomly even if the channel environment does not change before and after the transient period. For this reason, even if channel estimation is performed using the PSSCH DMRS sent after the transient period, the receiving UE may not be able to accurately estimate the channel before the transient period.

[0176] Therefore, even in the symbol duration in which the PSCCH and the PSSCH are FDMed to each other (eg, Fig.15 In the FDM area of ​​the second RB group or the second subchannel group, the transmitting UE may also need to map the PSSCH DMRS. In this case, in the second RB group or the second subchannel group, the reference point can be (pre) configured as the first symbol of the side link resource in the time slot or the first symbol of the allocated PSSCH resource. In this case, the symbol position of the first PSSCH DMRS can be configured as 0, and the length of the reference symbol duration can be the length of the symbol duration from the reference point to the last symbol of the allocated PSSCH resource. In order to avoid the situation where the PSSCH DMRS is mapped in the symbol (duration) in which the receiving UE performs AGC, in the second RB group or the second subchannel group, for example, the reference point can be (pre) configured as the next symbol of the last symbol of the symbol duration that can potentially be used to perform the AGC of the receiving UE or the second symbol of the side link resource in the time slot. In this case, for example, the symbol position of the first PSSCH DMRS can be configured as 0. The length of the reference symbol duration can be the length of the symbol duration from the reference point to the last symbol of the allocated PSSCH resource.

[0177] For example, in the second RB group or the second subchannel group, the reference point may be (pre)configured as the first symbol of the sublink resource in the time slot or the first symbol of the allocated PSSCH resource. In this case, the symbol position of the first PSSCH DMRS may be (pre)configured as 1 or the next symbol of the last symbol of the symbol duration that can potentially be used for the AGC performance of the receiving UE. The length of the reference symbol duration may be the length of the symbol duration from the reference point to the last symbol of the allocated PSSCH resource.

[0178] In order to configure or determine the position of the PSSCH DMRS, according to the reference parameters configured for the first RB group or the first sub-channel group respectively (e.g., reference point, symbol position of the first PSSCH DMRS, length of the reference symbol duration), the transmitting UE may configure and apply the position mode of the PSSCH DMRS, and may map and transmit the PSSCH DMRS. Furthermore, according to the reference parameters configured for the second RB group or the second sub-channel group respectively (e.g., reference point, symbol position of the first PSSCH DMRS, length of the reference symbol duration), the transmitting UE may configure and apply the DMRS mode, and may map and transmit the PSSCH DMRS.

[0179] For example, in order to configure or determine the position of the PSSCH DMRS, according to the same reference parameters for the first RB group and the second RB group (e.g., reference point, symbol position of the first PSSCH DMRS, length of the reference symbol duration), the transmitting UE may (pre) configure the position mode of the PSSCH DMRS. Thereafter, for example, the transmitting UE may map and transmit the PSSCH DMRS by applying different position modes of the PSSCH DMRS according to each RB group. For example, in order to configure or determine the position of the PSSCH DMRS, according to the same reference parameters for the first sub-channel group and the second sub-channel group (e.g., reference point, symbol position of the first PSSCH DMRS, length of the reference symbol duration), the transmitting UE may (pre) configure the position mode of the PSSCH DMRS. Thereafter, for example, the transmitting UE may map and transmit the PSSCH DMRS by applying different position modes of the PSSCH DMRS to each sub-channel group. Herein, for example, the reference point may be (pre) configured as the first symbol of the sub-link resource in the time slot or the first symbol of the allocated PSSCH resource. For example, the reference point may be (pre)configured to be the next symbol of the last symbol of the symbol duration of the AGC that can potentially be used to receive the UE or the second symbol of the side link resource in the time slot. In this case, for example, the symbol position of the first PSSCH DMRS may be (pre)configured to 0. For example, the length of the reference symbol duration may be the length of the symbol duration from the PSSCH resource allocated from the reference point to the last symbol. For example, when the transmitting UE applies the position pattern of the PSSCH DMRS to the first RB group or the first sub-channel group, the transmitting UE may map the PSSCH DMRS by applying the position pattern of the PSSCH DMRS based on the reference parameters configured for the first RB group or the first sub-channel group so as not to overlap with the PSCCH resources. In addition, when the transmitting UE applies the position pattern of the PSSCH DMRS to the second RB group or the second sub-channel group, the transmitting UE may map and transmit the PSSCH DMRS to the PSSCH resources by applying the position pattern of the PSSCH DMRS based on the reference parameters configured for the second RB group or the second sub-channel group.

[0180] In addition, the position mode of the PSSCH DMRS can be flexibly changed, and the information related to the position mode of the PSSCH DMRS can be indicated by the SCI indicating the PSSCH resource allocation. For example, the transmitting UE can send information related to the position mode of the PSSCH DMRS to the receiving UE through the SCI. For example, the transmitting UE can inform or indicate the maximum number of non-continuous symbols or symbol groups to which the PSSCH DMRS is mapped to the receiving UE through the SCI. That is, the transmitting UE can send information related to the maximum number of non-continuous symbols or symbol groups to which the PSSCH DMRS is mapped to the receiving UE through the SCI. For example, with reference to Tables 7 and 8, the transmitting UE can inform or indicate all or part of the values ​​(e.g., 0, 1, 2, 3) of the dmrs-AdditionalPosition defined for the PSSCH DMRS to the receiving UE through the SCI. For example, the candidate value related to the position mode of the PSSCH DMRS that the transmitting UE can inform the receiving UE through the SCI can be configured (in advance) for the transmitting UE, and the transmitting UE can inform or indicate at least one candidate value among the candidate values ​​to the receiving UE through the SCI. For example, the candidate value associated with the position pattern of the PSSCH DMRS may be a value associated with dmrs-AdditionalPosition. For example, the receiving UE may determine the position of the time-frequency resource to which the PSSCH DMRS is mapped based on information associated with the position pattern of the PSSCH DMRS received through the SCI and the length of the reference symbol duration. And, the receiving UE may receive the PSSCH DMRS from the transmitting UE at the determined time-frequency resource position. For example, information for PSSCH mapping type A or PSSCH mapping type B may be (pre-) configured for the transmitting UE, and a combination candidate combining information associated with the position pattern of the PSSCH DMRS and each PSSCH mapping type may be (pre-) configured for the transmitting UE, and the transmitting UE may inform or indicate at least one combination candidate among the combination candidates to the receiving UE through the SCI. That is, the transmitting UE may send information (or value) associated with at least one combination candidate among the combination candidates to the receiving UE through the SCI. For example, when the combined candidate for combining information related to the position pattern of the PSSCH DMRS and each mapping type is dmrs-AdditionalPosition=0 and PSSCH mapping type A, the value associated with the combined candidate may be {00}. For example, when the combined candidate is dmrs-AdditionalPosition=2 and PSSCH mapping type A, the value may be {01}. For example, when the combined candidate is dmrs-AdditionalPosition=2 and PSSCH mapping type B, the value may be {10}.For example, when the combination candidate is dmrs-AdditionalPosition=3 and PSSCH mapping type B, the value may be {11}.

[0181] For example, a value related to dmrs-AdditionalPosition may be (pre-) configured for a transmitting UE, and the transmitting UE may inform or indicate the length of the reference symbol duration to the receiving UE through SCI. That is, the transmitting UE may send information related to the length of the reference symbol duration to the receiving UE through SCI. For example, considering the overhead of SCI, some candidate values ​​related to the length of the reference symbol may be (pre-) configured for the transmitting UE, and the transmitting UE may inform or indicate at least one candidate value among the candidate values ​​to the receiving UE through SCI. For example, information for PSSCH mapping type A or PSSCH mapping type B may be (pre-) configured for the transmitting UE, and a combined candidate combining the length of the reference symbol duration with each PSSCH mapping type may be (pre-) configured for the transmitting UE, and the transmitting UE may inform or indicate at least one combined candidate among the combined candidates to the receiving UE through SCI. That is, the transmitting UE may send information (or value) related to at least one combined candidate among the combined candidates to the receiving UE through SCI. Alternatively, for example, when the length of the reference symbol duration is the length of the actually allocated PSSCH resource, the length of the reference symbol duration may be pre-configured for the UE.

[0182] For example, a combination candidate combining dmrs-AdditionalPosition and the length of the reference symbol duration may be (pre-)configured for the transmitting UE, and the transmitting UE may inform or indicate at least one of the combination candidates to the receiving UE through the SCI. That is, the transmitting UE may send information (or values) related to at least one of the combination candidates to the receiving UE through the SCI. For example, when the combination candidate combining dmrs-AdditionalPosition and the length of the reference symbol duration is dmrs-AdditionalPosition=0 and l d =5, the value of the combined candidate may be {00}. For example, when the combined candidate is dmrs-AdditionalPosition=0 and l d =8, the value may be {01}. For example, when the combined candidate is dmrs-AdditionalPosition=3 and l d =8, the value may be {10}. For example, when the combined candidate is dmrs-AdditionalPosition=3 and l d =13, the value can be {11}.

[0183] For example, information for PSSCH mapping type A or PSSCH mapping type B may be (pre-)configured for the transmitting UE, and a combination candidate combining dmrs-AdditionalPosition, the length of the reference symbol interval, and each PSSCH mapping type may be (pre-)configured for the transmitting UE, and the transmitting UE may inform or indicate at least one combination candidate among the combination candidates to the receiving UE through the SCI. That is, the transmitting UE may send information (or value) related to at least one combination candidate among the combination candidates to the receiving UE through the SCI.

[0184] In addition, a single SCI can indicate the allocation of multiple PSSCH resources. For example, the transmitting UE can indicate multiple PSSCH resources to the receiving UE through a single SCI. That is, the transmitting UE can send information related to the allocation of multiple PSSCH resources to the receiving UE through a single SCI. For example, the transmitting UE can allocate initial transmission resources and future retransmission resources. That is, future retransmission resources can be resources after the initial transmission resources in the time domain. Alternatively, for example, the transmitting UE can allocate multiple initial transmission resources in advance. In this case, information related to the position pattern of the PSSCH DMRS can be indicated separately for each PSSCH resource. For example, the transmitting UE can send or indicate information related to the position pattern of the PSSCH DMRS of each PSSCH resource to the receiving UE separately through the SCI. For example, when information related to the allocation of N PSSCH resources is indicated through a single SCI, information related to the position pattern of the N PSSCH DMRS can be indicated together. For example, when a sending UE sends or indicates information related to the allocation of N PSSCH resources to a receiving UE via SCI, the sending UE may send or indicate information related to the position pattern of N PSSCH DMRSs to the receiving UE together via SCI. For example, based on the length of the reference symbol duration when each PSSCH is sent and / or information related to the position pattern of the PSSCH DMRS for each PSSCH resource, the sending UE may determine the position of the time-frequency resource to which the PSSCH DMRS is mapped. And, for example, based on the length of the reference symbol duration when each PSSCH is sent and / or information related to the position pattern of the PSSCH DMRS for each PSSCH resource, the receiving UE may determine the position of the time-frequency resource to which the PSSCH DMRS is mapped. However, in the case of the above method, the SCI overhead may become too large.

[0185] For example, when a transmitting UE sends information related to a position pattern of a PSSCH DMRS of multiple PSSCH resources through an SCI, based on the length of the reference symbol duration when sending the PSSCH, the position pattern of the PSSCH DMRS actually sent when sending each PSSCH may be different. For example, the transmitting UE may send or indicate information related to a position pattern of a PSSCH DMRS for multiple PSSCH resources to a receiving UE through a single SCI, and the receiving UE may determine the position of the PSSCH DMRS mapping resources of the multiple PSSCH DMRS resources indicated by the single SCI based on the information related to the position pattern of the one PSSCH DMRS. For example, based on the length of the reference symbol duration when sending the PSSCH and / or the information related to the position pattern of a PSSCH DMRS of multiple PSSCH resources, the transmitting UE may determine the position of the time-frequency resource to which the PSSCH DMRS is mapped. For example, based on the length of the reference symbol duration when sending the PSSCH and / or the information related to the position pattern of a PSSCH DMRS of multiple PSSCH resources, the receiving UE may determine the position of the time-frequency resource to which the PSSCH DMRS is mapped. That is, even when information related to the location pattern of PSSCH DMRS is the same for multiple PSSCH resources, the location of the time-frequency resource to which the actual PSSCH DMRS is mapped may be different based on the length of the reference symbol duration at the time point when each PSSCH is transmitted.

[0186] For example, a combination candidate that combines information related to the position pattern of the PSSCH DMRS for each of a plurality of PSSCH resources may be (pre-)configured for the transmitting UE, and the transmitting UE may inform or indicate at least one of the combination candidates to the receiving UE through the SCI. That is, the transmitting UE may send information (or values) related to at least one combination candidate among the combination candidates to the receiving UE through the SCI. For example, when the combination candidate that combines information related to the position pattern of the PSSCH DMRS for each of a plurality of PSSCH resources is dmrs-AdditoinalPosition=0 for the first PSSCH and dmrs-AdditoinalPosition=0 for the second PSSCH, the value of the combination candidate may be {00}. For example, when the combination candidate is dmrs-AdditoinalPosition=3 for the first PSSCH and dmrs-AdditoinalPosition=0 for the second PSSCH, the value may be {01}. For example, when the combined candidate is dmrs-AdditoinalPosition=0 of the first PSSCH and dmrs-AdditoinalPosition=3 of the second PSSCH, the value may be {10}. For example, when the combined candidate is dmrs-AdditoinalPosition=3 of the first PSSCH and dmrs-AdditoinalPosition=3 of the second PSSCH, the value may be {11}.

[0187] For example, based on the length of the reference symbol duration when the PSSCH is transmitted and / or information related to the position pattern of the PSSCH DMRS for each PSSCH resource, the transmitting UE may determine the position of the time-frequency resource to which the PSSCH DMRS is mapped. For example, the transmitting UE may map the PSSCH DMRS on the determined time-frequency resource and send the PSSCH DMRS to the receiving UE. For example, based on the length of the reference symbol duration when the PSSCH is transmitted and / or information related to the position pattern of the PSSCH DMRS for each PSSCH resource, the receiving UE may determine the position of the time-frequency resource to which the PSSCH DMRS is mapped. For example, the receiving UE may receive the PSSCH DMRS from the transmitting UE on the determined time-frequency resource.

[0188] In addition, referring to Table 7 and Table 8, for example, according to the value of dmrs-AdditionalPosition defined for PSSCH DMRS or the density of PSSCH DMRS, the reference point, the symbol position 10 of the first PSSCH DMRS and / or the length l of the reference symbol durationd The definition or corresponding value of may be different. For example, when the value of dmrs-AdditionalPosition is less than or equal to a specific threshold (for example, if the value of dmrs-AdditionalPosition is 1 or 2), the value of l0 may be configured or defined so that the first PSSCH DMRS is mapped in the time domain after the resources associated with the PSCCH transmission. For example, when the value of dmrs-AdditionalPosition is less than or equal to a specific threshold, the transmitting UE may map the PSSCH DMRS based on the value of l0 configured or defined so that the first PSSCH DMRS is mapped immediately after the resources associated with the PSCCH transmission, and may send the PSSCH DMRS to the receiving UE. Specifically, for example, if the end symbol index of the PSCCH resource is 3, l0 may be 4 (for example, when the reference point is the first symbol of the PSSCH resource) or 3 (for example, when the reference point is the second symbol of the PSSCH resource). On the other hand, if the value of dmrs-AdditionalPosition exceeds a specific threshold, the value of l0 may be defined or configured so that the first PSSCH DMRS is mapped in the time domain after the AGC symbol or the AGC period. For example, if the value of dmrs-AdditionalPosition exceeds a specific threshold, the transmitting UE may map the PSSCH DMRS based on the value of l0 configured or defined so that the first PSSCH DMRS is mapped in the time domain immediately after the AGC symbol or the AGC period, and may send the PSSCH DMRS to the receiving UE. Specifically, for example, when the AGC symbol is the first symbol of the PSSCH resource, the value of l0 may be 1 (e.g., when the reference point is the first symbol of the PSSCH resource) or 0 (e.g., when the reference point is the second symbol of the PSSCH resource).

[0189] In addition, for example, based on the number of subchannels, the number of RBs constituting the PSCCH (i.e., the number of RBs included in the PSCCH resources, hereinafter, the number of RBs in the PSCCH), and / or the number of subchannels allocated for the PSSCH, the reference point, the symbol position of the first PSSCH DMRS (10), and / or the length of the reference symbol duration (10). d ) may be defined differently. For example, based on the number of subchannels, the number of RBs in the PSCCH, and / or the number of subchannels allocated for the PSSCH, the symbol position (10) of the first PSSCH DMRS and / or the length of the reference symbol duration (1 d) may be different. For example, when the number of RBs in the PSCCH is equal to the subchannel size, or when the number of RBs in the PSCCH is greater than or equal to a specific threshold, a value of 10 may be configured or defined so that the first PSSCH DMRS is mapped in the time domain after the resources associated with the PSCCH transmission. In this case, for example, the case where the number of RBs in the PSCCH is equal to the subchannel size or the case where the number of RBs in the PSCCH is equal to or greater than a specific threshold may include a case where there are no remaining RBs (i.e., the number of remaining RBs is 0) after mapping the PSCCH in the subchannel or a case where the number of RBs remaining after mapping the PSCCH in the subchannel is K (e.g., the value of K is 1 or 2) RBs or less. And / or, for example, when the number of subchannels allocated for the PSSCH is 1, a value of l0 may be configured or defined so that the first PSSCH DMRS is mapped in the time domain after the resources associated with the PSCCH transmission. And / or, for example, when all symbol positions of the PSSCH DMRS exist within the symbol duration of the PSCCH, the value of l0 may be configured or defined so that the first PSSCH DMRS is mapped in the time domain after the resources associated with the PSCCH transmission. For example, based on the value of l0 configured or defined so that the first PSSCH DMRS is mapped immediately after the resources associated with the PSCCH transmission, the transmitting UE may map the PSSCH DMRS and send the PSSCH DMRS to the receiving UE. Specifically, for example, if the end symbol index of the PSCCH resource is 3, l0 may be 4 (for example, when the reference point is the first symbol of the PSSCH resource) or 3 (for example, when the reference point is the second symbol of the PSSCH resource).

[0190] Reference Fig.17 In step S1740, the transmitting UE may transmit the PSSCH DMRS to the receiving UE. The transmission may include unicast, broadcast or multicast. For example, according to various embodiments of the present disclosure, the transmitting UE may map the PSSCH DMRS to the PSSCH resource.

[0191] According to the embodiments of the present disclosure, the transmitting UE can efficiently map and / or transmit the PSSCH DMRS on the PSSCH resources. Therefore, as far as the receiving UE is concerned, the detection performance of the PSSCH DMRS can be improved, and the receiving UE can efficiently decode the PSSCH.

[0192] Fig.21 The diagram shows a process in which a transmitting UE sends a DMRS to a receiving UE through a PSSCH according to an embodiment of the present disclosure. Fig.21 It can be combined with various embodiments of the present disclosure.

[0193] Reference Fig.21 In step S2110, the transmitting UE may send the SCI to the receiving UE via the PSCCH. For example, the SCI may include information related to the DMRS pattern. For example, the information related to the DMRS pattern may include information on the number of DMRSs.

[0194] In step S2120, the transmitting UE may map DMRS on resources associated with the PSSCH. For example, the transmitting UE may map DMRS on resources associated with the PSSCH based on information associated with the pattern of DMRS and the length of the symbol duration of the PSSCH associated with the PSCCH. For example, the length of the symbol duration of the PSSCH may be preconfigured for the UE. For example, the length of the symbol duration of the PSSCH associated with the PSCCH may include the length of the above-mentioned reference symbol duration. For example, the length of the reference symbol duration may be the length of the actually allocated PSSCH resources. For example, the pattern of the DMRS mapped on the resources associated with the PSSCH may differ according to the length of the symbol duration of the PSSCH and the number of DMRS.

[0195] According to an embodiment of the present disclosure, the transmitting UE may map the first DMRS from the second symbol in the time slot associated with the PSSCH based on the number of DMRS exceeding a preconfigured threshold. That is, for example, the transmitting UE may map the first DMRS after the AGC symbol in the time slot associated with the PSSCH based on the number of DMRS exceeding a preconfigured threshold. For example, the transmitting UE may map the first DMRS to the next symbol of the AGC symbol in the time slot associated with the PSSCH based on the number of DMRS exceeding a preconfigured threshold.

[0196] According to an embodiment of the present disclosure, the transmitting UE may map the first DMRS to a symbol after the last symbol of the PSCCH based on the number of DMRS being less than or equal to a preconfigured threshold. For example, the transmitting UE may map the first DMRS to the next symbol of the last symbol of the PSCCH based on the number of DMRS being less than or equal to a preconfigured threshold. For example, the transmitting UE may map the first DMRS to a symbol after a preconfigured offset value from the last symbol of the PSCCH based on the number of DMRS being less than or equal to a preconfigured threshold. For example, the transmitting UE may map the first DMRS to the next symbol of the last symbol of the PSCCH based on the number of DMRS being less than or equal to a preconfigured threshold. For example, the preconfigured offset value may be 1.

[0197] [Table 9]

[0198]

[0199] More specifically, Table 9 above may indicate the pattern of DMRS mapped on resources related to PSSCH based on the length of the symbol duration of PSSCH, PSSCH mapping type, and dmrs-AdditionalPosition (eg, the number of DMRS). d The value may be the length of the symbol duration of the actual allocated PSSCH including the AGC symbol. For example, the value l0 may be the symbol index in the timeslot associated with the PSSCH to which the first DMRS is mapped. For example, Table 9 may be a table showing the length of the symbol duration based on the PSSCH, the PSSCH mapping type, and the dmrs-AdditionalPosition (e.g., the number of DMRS) mapped to the position of the DMRS on the resources associated with the PSSCH according to the symbol index value in the timeslot associated with the PSSCH including the AGC symbol. For example, the symbol mapped to symbol index 0 in Table 9 may be an AGC symbol.

[0200] For example, referring to Table 9, when the value of dmrs-AdditionalPosition is less than or equal to a preconfigured threshold (e.g., 1), the transmitting UE may map the first PSSCH DMRS to resources after the resources associated with the PSCCH transmission in the time domain. For example, when the value of dmrs-AdditionalPosition is 1 and the PSSCH mapping type is A, the transmitting UE may determine the value l0 based on the length of the symbol duration of the PSCCH. For example, when the length of the symbol duration of the PSCCH is 2, the transmitting UE may determine the value l0 to be 3, so that the first DMRS is located after the AGC symbol included in the symbol duration of the PSSCH. For example, when the value of dmrs-AdditionalPosition is 1, the length of the symbol duration of the PSSCH is 9, and the PSSCH mapping type is A, the transmitting UE may map the PSSCH DMRS to symbol index 3 and symbol index 8 in the time slot associated with the PSSCH.

[0201] For example, referring to Table 9, when the value of dmrs-AdditionalPosition exceeds a preconfigured threshold (e.g., 1), the transmitting UE may map the first PSSCH DMRS to the symbol immediately following the AGC symbol in the time slot associated with the PSSCH. For example, when the value of dmrs-AdditionalPosition is 2 and the PSSCH mapping type is B, the value of l0 may be determined to be 1. That is, for example, the transmitting UE may determine that the value l0 is 1 so that the first DMRS is located after the AGC symbol in the time slot associated with the PSSCH. For example, when the value of dmrs-AdditionalPosition is 2, the length of the symbol duration of the PSSCH is 9 and the PSSCH mapping type is B, the transmitting UE may map the PSSCH DMRS to symbol index 1, symbol index 4 and symbol index 8 in the time slot associated with the PSSCH.

[0202] [Table 10]

[0203]

[0204] For example, referring to Table 10, the transmitting UE may determine the pattern of the DMRS mapped on the resources associated with the PSSCH based on the length of the symbol duration of the PSCCH, the length of the symbol duration of the PSSCH, and the number of DMRS. For example, the transmitting UE may map the DMRS on the resources associated with the PSSCH based on the above Table 10. For example, when the length of the symbol duration of the PSCCH is 2, the number of PSSCH DMRS is 4, and the length of the symbol duration of the PSSCH is 11, the position of the PSSCH DMRS may be 1, 4, 7, and 10. For example, 1, 4, 7, and 10 may represent the value of the symbol index in the time slot associated with the PSSCH. That is, for example, when the length of the symbol duration of the PSCCH is 2, the number of PSSCH DMRS is 4, and the length of the symbol duration of the PSSCH is 11, the transmitting UE may map the PSSCH DMRS to the second symbol, the fifth symbol, the eighth symbol, and the eleventh symbol in the time slot associated with the PSSCH. For example, when the length of the symbol duration of the PSCCH is 3, the number of PSSCH DMRS is 2, and the length of the symbol duration of the PSSCH is 11, the position of the PSSCH DMRS may be 4 or 10. For example, 4 and 10 may represent the value of the symbol index in the time slot associated with the PSSCH. That is, for example, when the length of the symbol duration of the PSCCH is 3, the number of PSSCH DMRS is 2, and the length of the symbol duration of the PSSCH is 11, the transmitting UE may map the PSSCH DMRS to the fifth symbol and the eleventh symbol in the time slot associated with the PSSCH.

[0205] In step S2130 , the transmitting UE may send the DMRS to the receiving UE via the PSSCH.

[0206] Fig. 22 A method in which a first device transmits a DMRS to a second device through a PSSCH according to an embodiment of the present disclosure is shown. Fig. 22 It can be combined with various embodiments of the present disclosure.

[0207] Reference Fig. 22 In step S2210, the first device 100 may send sublink control information (SCI) including information related to a pattern of a demodulation reference signal (DMRS) to the second device 200 through a physical sublink control channel (PSCCH). For example, the DMRS may be a reference signal for decoding a physical sublink shared channel (PSSCH). For example, the information related to the pattern of the DMRS may include information on the number of DMRSs.

[0208] In step S2220, the first device 100 may map the DMRS to resources associated with the PSSCH based on information related to the pattern of the DMRS and the length of the symbol duration of the physical sidelink shared channel (PSSCH) associated with the PSCCH. For example, the first device 100 may map the first DMRS to the second symbol in the time slot associated with the PSSCH based on the number of DMRS exceeding a preconfigured threshold. For example, the first symbol in the time slot associated with the PSSCH may include an automatic gain control (AGC) symbol. For example, frequency division multiplexing (FDM) may be performed on resources associated with the PSCCH and resources associated with the PSSCH. For example, the first device 100 may map the DMRS to the second symbol, the fifth symbol, and the eighth symbol in the time slot associated with the PSSCH based on the length of the symbol duration of the PSSCH being 9 and the number of DMRS being 3. For example, the first device 100 may map the DMRS to the second symbol, the sixth symbol, and the tenth symbol in the time slot associated with the PSSCH based on the length of the symbol duration of the PSSCH being 11 and the number of DMRS being 3. For example, the first device 100 may map the DMRS to the second symbol, the seventh symbol, and the twelfth symbol in the time slot associated with the PSSCH based on the length of the symbol duration of the PSSCH being 13 and the number of DMRS being 3. For example, the first device 100 may map the DMRS to the second symbol, the fifth symbol, the eighth symbol, and the eleventh symbol in the time slot associated with the PSSCH based on the length of the symbol duration of the PSSCH being 13 and the number of DMRS being 4.

[0209] For example, the first device 100 may map the first DMRS to a symbol after the last symbol of the PSCCH based on the number of DMRS being less than or equal to a preconfigured threshold. For example, the first device 100 may map the first DMRS to a symbol next to the last symbol of the PSCCH based on the number of DMRS being less than or equal to a preconfigured threshold. For example, the first device 100 may map the first DMRS to a symbol after a preconfigured offset value from the last symbol of the PSCCH based on the number of DMRS being less than or equal to a preconfigured threshold. For example, the preconfigured offset value may be 1. For example, time division multiplexing (TDM) may be performed on resources associated with the PSCCH and resources associated with the PSSCH. For example, the first device 100 may map the DMRS to the fourth symbol and the ninth symbol in a time slot associated with the PSSCH based on the length of the symbol duration of the PSSCH being 9 and the number of DMRS being 2. For example, the first device 100 may map the DMRS to the second symbol and the sixth symbol in the time slot associated with the PSSCH based on the length of the symbol duration of the PSSCH being 6 and the number of DMRS being 2.

[0210] In step S2230, the first device 100 may transmit the DMRS to the second device 200 through the PSSCH. For example, the first device 100 may transmit the DMRS mapped to the resources related to the PSSCH to the second device 200 through the PSSCH.

[0211] The above-mentioned embodiments can be applied to various devices to be described below. First, for example, the processor 102 of the first device 100 can control the transceiver 106 to send the SCI including the information related to the pattern of the DMRS to the second device 200 through the PSCCH. And, for example, the processor 102 of the first device 100 can map the DMRS to the resources related to the PSSCH based on the information related to the pattern of the DMRS and the length of the symbol duration of the PSSCH related to the PSCCH. And, for example, the processor 102 of the first device 100 can control the transceiver 106 to send the DMRS to the second device 200 through the PSSCH.

[0212] According to an embodiment of the present disclosure, a first device configured to perform wireless communication may be provided. For example, the first device may include: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute the instructions to: send a sublink control information (SCI) including information related to a mode of a demodulation reference signal (DMRS) to a second device via a physical sublink control channel (PSCCH), map the DMRS to resources related to the PSSCH based on the information related to the mode of the DMRS and the length of the symbol duration of the physical sublink shared channel (PSSCH) related to the PSCCH, and send the DMRS to the second device via the PSSCH.

[0213] According to an embodiment of the present disclosure, a device configured to control a first user equipment (UE) may be provided. For example, the device may include: one or more processors; and one or more memories, the one or more memories being operably connected to the one or more processors and storing instructions. For example, the one or more processors may execute the instructions to: send a sublink control information (SCI) including information related to a pattern of a demodulation reference signal (DMRS) to a second UE via a physical sublink control channel (PSCCH), map the DMRS to resources related to the PSSCH based on the information related to the pattern of the DMRS and the length of the symbol duration of a physical sublink shared channel (PSSCH) related to the PSCCH, and send the DMRS to the second UE via the PSSCH.

[0214] According to an embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. For example, when the instructions are executed, the first device: sends sidelink control information (SCI) including information related to the pattern of a demodulation reference signal (DMRS) to a second device via a physical sidelink control channel (PSCCH), maps the DMRS to resources related to the PSSCH based on the information related to the pattern of the DMRS and the length of the symbol duration of a physical sidelink shared channel (PSSCH) related to the PSCCH, and sends the DMRS to the second device via the PSSCH.

[0215] Fig.23 A method in which a second device receives a DMRS from a first device through a PSSCH according to an embodiment of the present disclosure is shown. Fig.23It can be combined with various embodiments of the present disclosure.

[0216] Reference Fig.23 In step S2310, the second device 200 may receive an SCI including information related to a DMRS pattern from the first device 100 through a PSCCH. For example, the DMRS may be a reference signal for decoding the PSSCH. For example, the information related to the DMRS pattern may include information on the number of DMRSs.

[0217] For example, the DMRS can be mapped to resources associated with the PSSCH based on information related to the DMRS pattern and the length of the symbol duration of the PSSCH associated with the PSCCH. For example, the first DMRS can be mapped to the second symbol in the time slot associated with the PSSCH based on the number of DMRS exceeding a preconfigured threshold. For example, the first symbol in the time slot associated with the PSSCH may include an automatic gain control (AGC) symbol. For example, frequency division multiplexing (FDM) can be performed on resources associated with the PSCCH and resources associated with the PSSCH. For example, the DMRS can be mapped to the second symbol, the fifth symbol, and the eighth symbol in the time slot associated with the PSSCH based on the length of the symbol duration of the PSSCH being 9 and the number of DMRS being 3. For example, the DMRS can be mapped to the second symbol, the sixth symbol, and the tenth symbol in the time slot associated with the PSSCH based on the length of the symbol duration of the PSSCH being 11 and the number of DMRS being 3. For example, based on the length of the symbol duration of the PSSCH being 13 and the number of DMRS being 3, the DMRS may be mapped to the second symbol, the seventh symbol, and the twelfth symbol in the time slot associated with the PSSCH. For example, based on the length of the symbol duration of the PSSCH being 13 and the number of DMRS being 4, the DMRS may be mapped to the second symbol, the fifth symbol, the eighth symbol, and the eleventh symbol in the time slot associated with the PSSCH.

[0218] For example, the first DMRS may be mapped to a symbol after the last symbol of the PSCCH based on the number of DMRS being less than or equal to a preconfigured threshold. For example, the first DMRS may be mapped to the next symbol of the last symbol of the PSCCH based on the number of DMRS being less than or equal to a preconfigured threshold. For example, the first DMRS may be mapped to a symbol after a preconfigured offset value from the last symbol of the PSCCH based on the number of DMRS being less than or equal to a preconfigured threshold. For example, the preconfigured offset value may be 1. For example, time division multiplexing (TDM) may be performed on resources associated with the PSCCH and resources associated with the PSSCH. For example, the DMRS may be mapped to the fourth symbol and the ninth symbol in a time slot associated with the PSSCH based on the length of the symbol duration of the PSSCH being 9 and the number of DMRS being 2. For example, the DMRS may be mapped to the second symbol and the sixth symbol in a time slot associated with the PSSCH based on the length of the symbol duration of the PSSCH being 6 and the number of DMRS being 2.

[0219] In step S2320, the second device 200 may receive a DMRS from the first device 100 through a PSSCH associated with a PSCCH. For example, the second device 200 may receive a DMRS mapped on resources associated with a PSSCH from the first device 100 through a PSSCH.

[0220] The above-mentioned embodiments can be applied to various devices to be described below. First, for example, the processor 202 of the second device 200 can control the transceiver 206 to receive the SCI including the information related to the pattern of the DMRS from the first device 100 through the PSCCH. And, for example, the processor 202 of the second device 200 can control the transceiver 206 to receive the DMRS from the first device 100 through the PSSCH related to the PSCCH.

[0221] According to an embodiment of the present disclosure, a second device configured to perform wireless communication may be provided. For example, the second device may include: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute the instructions to: receive sidelink control information (SCI) including information related to the pattern of a demodulation reference signal (DMRS) from a first device via a physical sidelink control channel (PSCCH), and receive the DMRS from the first device via a physical sidelink shared channel (PSSCH) related to the PSCCH. For example, based on information related to the pattern of the DMRS and the length of the symbol duration of the PSSCH related to the PSCCH, the DMRS is mapped to resources related to the PSSCH.

[0222] Fig.24 A method in which a first device transmits a PSSCH DMRS to a second device through a PSSCH according to an embodiment of the present disclosure is shown. Fig.24 It can be combined with various embodiments of the present disclosure.

[0223] Reference Fig.24 In step S2410, the first device 100 may select a synchronization source based on the secondary link synchronization priority. For example, the synchronization source may include at least one of a GNSS, a base station, or a terminal. For example, the secondary link synchronization priority may be configured based on Table 5 or Table 6 above. For example, the secondary link priority may be pre-configured for the first device 100.

[0224] In step S2420, the first device 100 may obtain synchronization based on the synchronization source. For example, the first device 100 may perform synchronization with the selected synchronization source.

[0225] In step S2430, the first device 100 may transmit a sublink synchronization signal block (S-SSB) block to the second device 200 based on the obtained synchronization. For example, the S-SSB block may include a sublink primary synchronization signal (S-PSS), a sublink secondary synchronization signal (S-SSS), and a physical sublink broadcast channel (PSBCH).

[0226] In step S2440, the first device 100 may transmit information related to a pattern of PSSCH DMRS for decoding PSSCH to the second device 200 through SCI on PSCCH. For example, the information related to the pattern of PSSCH DMRS may include information on the number of PSSCH DMRSs.

[0227] In step S2450, the first device 100 may map the PSSCH DMRS to the time resources associated with the PSSCH based on information related to the pattern of the PSSCH DMRS and the duration of the time resources scheduled for the transmission of the PSSCH associated with the PSCCH. For example, the first device 100 may map the first PSSCH DMRS to the second symbol in the time slot associated with the PSSCH based on the number of PSSCH DMRS exceeding a preconfigured threshold. For example, the first symbol of the PSSCH may include an AGC symbol. For example, frequency division multiplexing (FDM) may be performed on resources associated with the PSCCH and resources associated with the PSSCH.

[0228] For example, the duration of the time resources scheduled for the transmission of the PSSCH may be the symbol duration of the PSSCH. For example, the first device 100 may map the PSSCH DMRS to the second symbol, the fifth symbol, and the eighth symbol in the time slot associated with the PSSCH based on the length of the symbol duration of the PSSCH being 9 and the number of the PSSCH DMRS being 3. For example, the first device 100 may map the PSSCH DMRS to the second symbol, the sixth symbol, and the tenth symbol in the time slot associated with the PSSCH based on the length of the symbol duration of the PSSCH being 11 and the number of the PSSCH DMRS being 3. For example, the first device 100 may map the PSSCH DMRS to the second symbol, the seventh symbol, and the twelfth symbol in the time slot associated with the PSSCH based on the length of the symbol duration of the PSSCH being 13 and the number of the PSSCH DMRS being 3. For example, the first device 100 may map the PSSCH DMRS to the second symbol, the fifth symbol, the eighth symbol, and the eleventh symbol in the time slot related to the PSSCH based on the length of the symbol duration of the PSSCH being 13 and the number of PSSCH DMRS being 4.

[0229] For example, the first device 100 may map the first PSSCH DMRS to a symbol after the last symbol of the PSCCH based on the number of PSSCH DMRS being less than or equal to a preconfigured threshold. For example, the first device 100 may map the first PSSCH DMRS to a symbol next to the last symbol of the PSCCH based on the number of PSSCH DMRS being less than or equal to a preconfigured threshold. For example, the first device 100 may map the first PSSCH DMRS to a symbol after a preconfigured offset value from the last symbol of the PSCCH based on the number of PSSCH DMRS being less than or equal to a preconfigured threshold. For example, the preconfigured offset value may be 1. For example, time division multiplexing (TDM) may be performed on resources associated with the PSCCH and resources associated with the PSSCH. For example, the first device 100 may map the PSSCH DMRS to the fourth symbol and the ninth symbol in a time slot associated with the PSSCH based on the length of the symbol duration of the PSSCH being 9 and the number of PSSCH DMRS being 2. For example, the first device 100 may map the PSSCH DMRS to the second symbol and the sixth symbol in the time slot related to the PSSCH based on the length of the symbol duration of the PSSCH being 6 and the number of PSSCH DMRS being 2.

[0230] In step S2460, the first device 100 may transmit the PSSCH DMRS to the second device 200 through the PSSCH. For example, the first device 100 may transmit the PSSCH DMRS mapped to resources related to the PSSCH to the second device 200 through the PSSCH.

[0231] The above-mentioned embodiments can be applied to various devices to be described below. First, for example, the processor 102 of the first device 100 can select a synchronization source based on the side link synchronization priority. And, for example, the processor 102 of the first device 100 can obtain synchronization based on the synchronization source. And, for example, the processor 102 of the first device 100 can control the transceiver 106 to send a side link synchronization signal block (S-SSB) block to the second device 200 based on the obtained synchronization. And, for example, the processor 102 of the first device 100 can control the transceiver 106 to send information related to the pattern of the PSSCH DMRS for decoding the PSSCH to the second device 200 through the SCI on the PSCCH. And, for example, the processor 102 of the first device 100 can map the PSSCH DMRS to the time resources related to the PSSCH based on the information related to the pattern of the PSSCH DMRS and the duration of the time resources scheduled for the transmission of the PSSCH related to the PSCCH. And, for example, the processor 102 of the first device 100 can control the transceiver 106 to transmit the PSSCH DMRS to the second device 200 through the PSSCH.

[0232] According to an embodiment of the present disclosure, a first device configured to perform wireless communication may be provided. For example, the first device may include: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute the instructions to: select a synchronization source based on a sublink synchronization priority, obtain synchronization based on the synchronization source, send a sublink synchronization signal block (S-SSB) block to a second device based on the synchronization obtained, send information related to the pattern of the PSSCH DMRS for decoding the PSSCH to the second device via the SCI on the PSCCH, map the PSSCH DMRS to the time resources related to the PSSCH based on the information related to the pattern of the PSSCH DMRS and the duration of the time resources scheduled for the transmission of the PSSCH related to the PSCCH, and send the PSSCH DMRS to the second device via the PSSCH. For example, the S-SSB block may include a sidelink primary synchronization signal (S-PSS), a sidelink secondary synchronization signal (S-SSS), and a physical sidelink broadcast channel (PSBCH).

[0233] According to an embodiment of the present disclosure, a device configured to control a first user equipment (UE) may be provided. For example, the device may include: one or more processors; and one or more memories, the one or more memories being operably connected to the one or more processors and storing instructions. For example, the one or more processors may execute the instructions to: select a synchronization source based on a sidelink synchronization priority, obtain synchronization based on the synchronization source, send a sidelink synchronization signal block (S-SSB) block to a second UE based on the synchronization obtained, send information related to a pattern of a PSSCH DMRS for decoding a PSSCH to the second UE via an SCI on a PSCCH, map the PSSCH DMRS to a time resource related to the PSSCH based on information related to the pattern of the PSSCH DMRS and the duration of the time resource scheduled for the transmission of the PSSCH related to the PSCCH, and send the PSSCH DMRS to the second UE via the PSSCH. For example, the S-SSB block may include a sidelink primary synchronization signal (S-PSS), a sidelink secondary synchronization signal (S-SSS), and a physical sidelink broadcast channel (PSBCH).

[0234] According to an embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. For example, when the instructions are executed, the first device: selects a synchronization source based on the sublink synchronization priority, obtains synchronization based on the synchronization source, sends a sublink synchronization signal block (S-SSB) block to a second device based on the obtained synchronization, sends information related to the pattern of the PSSCH DMRS used to decode the PSSCH to the second device via the SCI on the PSCCH, maps the PSSCH DMRS to the time resources related to the PSSCH based on the information related to the pattern of the PSSCH DMRS and the duration of the time resources scheduled for the transmission of the PSSCH related to the PSCCH, and sends the PSSCH DMRS to the second device via the PSSCH. For example, the S-SSB block may include a sublink primary synchronization signal (S-PSS), a sublink secondary synchronization signal (S-SSS), and a physical sublink broadcast channel (PSBCH).

[0235] Hereinafter, devices to which various embodiments of the present disclosure can be applied will be described.

[0236] 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).

[0237] 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.

[0238] Fig.25 A communication system (1) according to an embodiment of the present disclosure is shown.

[0239] Reference Fig.25 , 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.

[0240] 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.

[0241] 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.

[0242] Fig.26 A wireless device according to an embodiment of the present disclosure is shown.

[0243] Reference Fig.26 , 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.25 {wireless device (100x) and BS (200)} and / or {wireless device (100x) and wireless device (100x)}.

[0244] 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 (transceivers) 106 and / or one or more antennas (antenna units) 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.

[0245] 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 (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.

[0246] 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.

[0247] 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.

[0248] 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.

[0249] 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.

[0250] Fig. 27 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown.

[0251] Reference Fig. 27 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. 27 Operation / function, not limited to Fig.26 The processor (102, 202) and / or transceiver (106, 206) of Fig.26The processor (102, 202) and / or the transceiver (106, 206) are implemented Fig. 27 For example, you can Fig.26 The processor (102, 202) implements blocks 1010 to 1060. Alternatively, Fig.26 The processor (102, 202) implements blocks 1010 to 1050 and can be implemented by Fig.26 The transceiver (106, 206) is used to implement box 1060.

[0252] Can be through Fig. 27 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).

[0253] 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.

[0254] 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.

[0255] Can be used with Fig. 27 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.26 100, 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.

[0256] Fig.28 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.25 ).

[0257] Reference Fig.28 , the wireless device (100, 200) may correspond to Fig.26 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.26 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.26The control unit (120) is electrically connected to the communication unit (110), the memory / 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).

[0258] 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.25 100a), vehicles ( Fig.25 100b-1 and 100b-2), XR devices ( Fig.25 100c), handheld device ( Fig.25 100d), household appliances ( Fig.25 100e), IoT devices ( Fig.25 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.25 400), BS( Fig.25 200), network nodes, etc. Depending on the use case / service, the wireless device can be used in a mobile or fixed place.

[0259] exist Fig.28In the wireless device (100, 200), all the various elements, components, units / parts and / or modules in the wireless device (100, 200) can be connected to each other through a wired interface, or at least part of them can be connected wirelessly through the communication unit (110). For example, in each of the wireless devices (100, 200), the control unit (120) and the communication unit (110) can be connected by wire, and the control unit (120) and the first unit (e.g., 130, 140) can be connected wirelessly through the communication unit (110). Each element, component, unit / part and / or module in the wireless device (100, 200) can also include one or more elements. For example, the control unit (120) can be constructed by a collection of one or more processors. As an example, the control unit (120) can be constructed by a collection of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit and a memory control processor. As another example, the memory / storage unit ( 130 ) may be constructed by random access memory (RAM), dynamic RAM (DRAM), read only memory (ROM), flash memory, volatile memory, nonvolatile memory, and / or combinations thereof.

[0260] Hereinafter, the implementation will be described in detail with reference to the accompanying drawings. Fig.28 .

[0261] Fig.29 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).

[0262] Reference Fig.29 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.28 Frame 110 to 130 / 140.

[0263] 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.

[0264] 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.

[0265] Fig.30 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.

[0266] Reference Fig.30 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.28 Frame 110 / 130 / 140.

[0267] 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.

[0268] 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.

[0269] 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 for performing wireless communication by a first device, the method comprising the following steps: Obtaining information related to the number of physical resource blocks (PRBs) used for a physical secondary link control channel (PSCCH) and information related to a subchannel size; The physical secondary link shared channel PSSCH demodulation reference signal DMRS is mapped to the PSSCH DMRS symbol in the time slot associated with the PSSCH, wherein, based on the number of the PRBs used for the PSCCH being less than the subchannel size, the PSSCH DMRS symbol is different from the PSCCH symbol; and The PSSCH DMRS mapped to the PSSCH DMRS symbol is sent.

2. The method according to claim 1, wherein: The number of PRBs used for the PSCCH is the frequency size of the PSCCH, and The sub-channel size is the frequency size of the sub-channel.

3. The method according to claim 1, wherein: The earliest symbol in the time slot associated with the PSSCH comprises an automatic gain control, AGC, symbol.

4. The method according to claim 1, wherein: Based on the number of the PRBs used for the PSCCH being less than the subchannel size and the subchannel size being less than a threshold, the PSSCH DMRS symbol is different from the PSCCH symbol.

5. The method according to claim 4, wherein: The threshold is 20 PRBs.

6. The method according to claim 1, wherein: Based on the number of at least one PSSCH DMRS symbol including the PSSCH DMRS symbol being less than or equal to a preconfigured threshold, the PSSCH DMRS is mapped to the PSSCH DMRS symbol subsequent to the PSCCH symbol.

7. The method according to claim 6, wherein: Time division multiplexing (TDM) is performed on resources associated with the PSCCH and resources associated with the PSSCH.

8. A first device for performing wireless communication, the first device comprising: one or more memories storing instructions; one or more transceivers; as well as one or more processors connected to the one or more memories and the one or more transceivers, wherein the one or more processors execute the instructions to: Obtaining information related to the number of physical resource blocks (PRBs) used for a physical secondary link control channel (PSCCH) and information related to a subchannel size; The physical secondary link shared channel PSSCH demodulation reference signal DMRS is mapped to the PSSCH DMRS symbol in the time slot associated with the PSSCH, wherein, based on the number of the PRBs used for the PSCCH being less than the subchannel size, the PSSCH DMRS symbol is different from the PSCCH symbol; and The PSSCH DMRS mapped to the PSSCH DMRS symbol is sent.

9. An apparatus configured to control a first user equipment UE, the apparatus comprising: one or more processors; as well as one or more memories operatively connectable to the one or more processors and storing instructions, wherein the one or more processors execute the instructions to: Obtaining information related to the number of physical resource blocks (PRBs) used for a physical secondary link control channel (PSCCH) and information related to a subchannel size; The physical secondary link shared channel PSSCH demodulation reference signal DMRS is mapped to the PSSCH DMRS symbol in the time slot associated with the PSSCH, wherein, based on the number of the PRBs used for the PSCCH being less than the subchannel size, the PSSCH DMRS symbol is different from the PSCCH symbol; and The PSSCH DMRS mapped to the PSSCH DMRS symbol is sent.

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