Method and Apparatus for performing sidelink positioning

Abstract

According to one embodiment of the present disclosure, a Type 1 terminal receives a SystemInformationBlock12 in a first cell, the SystemInformationBlock12 includes SL-ConfigCommonNR and SL_Pos_ConfigCommon, SL_Pos_ConfigCommon includes one or more Sl_Pos_ResourcePool IEs, the Type 1 terminal performs sidelink discovery based on SL-ConfigCommonNR, the Type 1 terminal receives a first SPP message from a Type 2 terminal, the Type 2 terminal is identified during sidelink discovery, the first SPP message includes the Pos_5G-S-TMSI of the Type 2 terminal, the Pos_5G-S-TMSI is a temporary terminal identifier provided by an LMF, and the Type 1 terminal performs sidelink positioning in the first cell based on the Pos_5G-S-TMSI of one or more Sl_Pos_ResourcePool IEs and the Sl_Pos_ResourcePool IEs.

Description

Technology Field

[0001] The present disclosure relates to a method and apparatus for performing side-link positioning. Background Technology

[0003] 5G communication systems were developed to meet the increasing demand for wireless data traffic following the commercialization of 4G communication systems. To achieve high data transmission rates, 5G communication systems introduced the mmWave band (e.g., the 60 GHz band). To mitigate path loss and increase transmission distance in the mmWave band, 5G communication systems utilize technologies such as beamforming, massive MIMO, full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and large-scale antennas. In 5G communication systems, base stations are divided into central and distributed units to enhance scalability. Furthermore, 5G communication systems aim to support extremely high data transmission rates and extremely low transmission latency to support a wide range of services.

[0004] The importance of accurate and rapid positioning is increasing day by day. To this end, a method to measure the location of a terminal using the side link of a 5G mobile communication system is required. The problem to be solved

[0006] The present disclosure aims to provide a method and apparatus for performing side-link positioning. means of solving the problem

[0008] According to one embodiment of the present disclosure, a Type 1 terminal receives a SystemInformationBlock12 in a first cell, the SystemInformationBlock12 includes SL-ConfigCommonNR and SL_Pos_ConfigCommon, SL_Pos_ConfigCommon includes one or more Sl_Pos_ResourcePool IEs, the Type 1 terminal performs sidelink discovery based on SL-ConfigCommonNR, the Type 1 terminal receives a first SPP message from a Type 2 terminal, the Type 2 terminal is identified during sidelink discovery, the first SPP message includes the Pos_5G-S-TMSI of the Type 2 terminal, the Pos_5G-S-TMSI is a temporary terminal identifier provided by an LMF, and the Type 1 terminal performs sidelink positioning in the first cell based on the Pos_5G-S-TMSI of one or more Sl_Pos_ResourcePool IEs and the Sl_Pos_ResourcePool IEs. Effects of the invention

[0012] The disclosed embodiment enables rapid and accurate terminal positioning using a side link. Brief explanation of the drawing

[0014] FIG. 1a is a diagram illustrating the structure of a 5G system and an NG-RAN according to one embodiment of the present disclosure. FIG. 1b is a diagram illustrating a wireless protocol structure in an NR system according to one embodiment of the present disclosure. FIG. 1c is a drawing illustrating the structure of a location identification system according to one embodiment of the present disclosure. FIG. 1d is a diagram illustrating a protocol layer structure for signaling between a location management function and a terminal according to one embodiment of the present disclosure. FIG. 2a is a diagram illustrating a positioning operation performed based on a downlink positioning reference signal and a sidelink positioning reference signal according to the present disclosure. FIG. 2b is a diagram illustrating downlink positioning reference signal measurement / reporting and sidelink positioning reference signal setting / measurement / reporting according to the present disclosure. FIG. 3a is a flowchart for explaining the operation of a terminal according to one embodiment of the present disclosure. FIG. 4a is a block diagram illustrating the internal structure of a terminal to which the present invention is applied. FIG. 4b is a block diagram illustrating the internal structure of a base station to which the present invention is applied. Specific details for implementing the invention

[0015] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Furthermore, in describing the present invention, detailed descriptions of related known functions or configurations are omitted if it is determined that such detailed descriptions would unnecessarily obscure the essence of the invention. Additionally, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intentions or conventions of the user or operator. Therefore, their definitions should be based on the content throughout this specification.

[0016] Terms used in the following description to identify connection nodes, terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, terms referring to various identification information, etc., are examples provided for the convenience of explanation. Accordingly, the present invention is not limited to the terms described below, and other terms referring to objects having equivalent technical meanings may be used.

[0017] For the convenience of the following explanation, the present invention uses terms and names defined in the 3GPP (3rd Generation Partnership Project) standard, which is the most recent standard among currently existing communication standards. However, the present invention is not limited by the above terms and names and can be applied in the same way to systems conforming to other standards.

[0018] Table 1 lists the abbreviations used in the present invention.

[0019] Acronym Full name Acronym Full name 5GC 5G Core Network RACH Random Access Channel ACK Acknowledgement RAN Radio Access Network AM Acknowledged Mode RAR Random Access Response AMF Access and Mobility Management Function RA-RNTI Random Access RNTI ARQ Automatic Repeat Request RAT Radio Access Technology AS Access Stratum RB Radio Bearer ASN.1 Abstract Syntax Notation One RLC Radio Link Control BSR Buffer Status Report RNA RAN-based Notification Area BWP Bandwidth Part RNAU RAN-based Notification Area Update CA Carrier Aggregation RNTI Radio Network Temporary Identifier CAG Closed Access Group RRC Radio Resource Control CG Cell Group RRM Radio Resource Management C-RNTI Cell RNTI RSRP Reference Signal Received Power CSI Channel State Information RSRQ Reference Signal Received Quality DCI Downlink Control Information RSSI Received Signal Strength Indicator DRB (user) Data Radio Bearer SCell Secondary Cell DRX Discontinuous Reception SCS Subcarrier Spacing HARQ Hybrid Automatic Repeat Request SDAP Service Data Adaptation Protocol IE Information element SDU Service Data Unit LCG Logical Channel Group SFN System Frame Number MAC Medium Access Control S-GW Serving Gateway MIB Master Information Block SI System Information NAS Non-Access Stratum SIB System Information Block NG-RAN NG Radio Access Network SpCell Special Cell NR NR Radio Access SRB Signalling Radio Bearer PBR Prioritised Bit Rate SRS Sounding Reference Signal PCell Primary Cell SS Search Space PCI Physical Cell Identifier SSB SS / PBCH block PDCCH Physical Downlink Control Channel SSS Secondary Synchronisation Signal PDCP Packet Data Convergence Protocol SUL Supplementary Uplink PDSCH Physical Downlink Shared Channel TM Transparent Mode PDU Protocol Data Unit UCI Uplink Control Information PHR Power Headroom Report UE User Equipment PLMN Public Land Mobile Network UM Unacknowledged Mode PRACH Physical Random Access Channel CRP Cell Reselection Priority PRB Physical Resource Block FPP First positioning protocol PSS Primary Synchronisation Signal SPP Second positioning protocol PUCCH Physical Uplink Control Channel DL-PRS Downlink-Positioning Reference Signal PUSCH Physical Uplink Shared Channel SL-PRS Sidelink-Positioning Reference Signal DL-AoD Downlink Angle-of-Departure GNSS Global Navigation Satellite System

[0020] Table 2 defines the terms frequently used in the present invention.

[0021] Terminology Definition Carrier frequency center frequency of the cell. Cell combination of downlink and optionally uplink resources. The linking between the carrier frequency of the downlink resources and the carrier frequency of the uplink resources is indicated in the system information transmitted on the downlink resources. Cell Group in dual connectivity, a group of serving cells associated with either the MeNB or the SeNB. Cell reselection A process to find a better suitable cell than the current serving cell based on the system information received in the current serving cell Cell selection A process to find a suitable cell either blindly or based on the stored information Cell Reselection Priority Priority of a carrier frequency regarding cell reselection. System Information Block 2 and System Information Block 3 provide the CRP of the serving frequency and CRPs of inter-frequencies respectively. UE consider higher priority frequency for cell reselection if channel condition of the frequency is better than a specific threshold even if channel condition of a lower priority frequency is better than that of the higher priority frequency. Dedicated signalling Signalling sent on DCCH logical channel between the network and a single UE. Field The individual contents of an information element are referred to as fields. Frequency layer set of cells with the same carrier frequency. Global cell identity An identity to uniquely identifying an NR cell. It is consisted of cellIdentity and plmn-Identity of the first PLMN-Identity in plmn-IdentityList in SIB1. gNB node providing NR user plane and control plane protocol terminations towards the UE, and connected via the NG interface to the 5GC. Handover procedure that changes the serving cell of a UE in RRC_CONNECTED. Information element A structural element containing single or multiple fields is referred as information element. L The Length field in MAC subheader indicates the length of the corresponding MAC SDU or of the corresponding MAC CE LCID 6 bit logical channel identity in MAC subheader to denote which logical channel traffic or which MAC CE is included in the MAC subPDU Logical channel a logical path between a RLC entity and a MAC entity. There are multiple logical channel types depending on what type of information is transferred e.g. CCCH (Common Control Channel), DCCH (Dedicate Control Channel), DTCH (Dedicate Traffic Channel), PCCH (Paging Control Channel) NR NR radio access PCell SpCell of a master cell group. registered PLMN PLMN which UE has registered to selected PLMN PLMN which UE has selected to perform registration procedure equivalent PLMN PLMN which is equivalent to registered PLMN. UE is informed of list of EPLMNs by AMF during registration procedure PLMN ID Check the process that checks whether a PLMN ID is the RPLMN identity or an EPLMN identity of the UE. Primary Cell The MCG cell, operating on the primary frequency, in which the UE either performs the initial connection establishment procedure or initiates the connection re-establishment procedure. Radio Bearer Logical path between a PDCP entity and upper layer (i.e. SDAP entity or RRC) RLC bearer RLC and MAC logical channel configuration of a radio bearer in one cell group. RLC bearer configuration The lower layer part of the radio bearer configuration comprising the RLC and logical channel configurations. Serving Cell For a UE in RRC_CONNECTED not configured with CA / DC there is only one serving cell comprising of the primary cell. For a UE in RRC_CONNECTED configured with CA / DC the term 'serving cells' is used to denote the set of cells comprising of the Special Cell(s) and all secondary cells. SpCell primary cell of a master or secondary cell group. Special Cell For Dual Connectivity operation the term Special Cell refers to the PCell of the MCG or the PSCell of the SCG, otherwise the term Special Cell refers to the PCell. SRB Signalling Radio Bearers" (SRBs) are defined as Radio Bearers (RBs) that are used only for the transmission of RRC and NAS messages. SRB0 SRB0 is for RRC messages using the CCCH logical channel SRB1 SRB1 is for RRC messages (which may include a piggybacked NAS message) as well as for NAS messages prior to the establishment of SRB2, all using DCCH logical channel; SRB2 SRB2 is for NAS messages and for RRC messages which include logged measurement information, all using DCCH logical channel. SRB2 has a lower priority than SRB1 and may be configured by the network after AS security activation; SRB3 SRB3 is for specific RRC messages when UE is in (NG)EN-DC or NR-DC, all using DCCH logical channel SRB4 SRB4 is for RRC messages which include application layer measurement reporting information, all using DCCH logical channel. CCCH CCCH is a logical channel to transfer initial RRC messages such as RRCSetupRequest, RRCResumeRequest and RRCSetup DCCH DCCH is a logical channel to transfer RRC messages after RRC connection establishment TRP A set of geographically co-located antennas (e.g. antenna array (with one or more antenna elements)) supporting TP and / or RP functionality. Suitable cell A cell on which a UE may camp. Following criteria apply - The cell is part of either the selected PLMN or the registered PLMN or PLMN of the Equivalent PLMN list- The cell is not barred- The cell is part of at least one TA that is not part of the list of "Forbidden Tracking Areas for Roaming" (TS 22.011

[18] ), which belongs to a PLMN that fulfills the first bullet above.- The cell selection criterion S is fulfilled (ie RSRP and RSRQ are better than specific values

[0022] In the present invention, "trigger" or "is triggered" and "initiate" or "is initiated" may be used with the same meaning.

[0023] FIG. 1a is a diagram illustrating the structure of a 5G system and an NG-RAN according to one embodiment of the present disclosure. The 5G system is configured with an NG-RAN (1a-01) and a 5GC (1a-02). The NG-RAN node is one of the following two.

[0024] 1: gNB providing NR user plane and control plane to the UE; or

[0025] 2: ng-eNB providing E-UTRA user plane and control plane to the UE.

[0026] gNB (1a-05 to 1a-06) and ng-eNB (1a-03 to 1a-04) are interconnected via an Xn interface. gNB and ng-eNB are connected to an Access and Mobility Management Function (AMF) (1a-07) and a User Plane Function (UPF) (1a-08) via an NG interface. The AMF (1a-07) and UPF (1a-08) may consist of a single physical node or separate physical nodes.

[0027] gNB (1a-05 to 1a-06) and ng-eNB (1a-03 to 1a-04) host the functions listed below.

[0028] Radio bearer control, radio acceptance control, connection mobility control, dynamic allocation of resources to UEs on uplink, downlink, and sidelink (scheduled), IP and Ethernet header compression, uplink data decompression and encryption of user data streams, selection of AMF when an AMF cannot be selected with information provided by the terminal, routing of user plane data to the UPF, scheduling and transmission of paging messages, scheduling and transmission of broadcast information (originating from AMF or O&M);

[0029] Measurement and measurement reporting configuration for mobility and scheduling, session management, QoS flow management and mapping for data wireless bearers, RRC_INACTIVE support, wireless access network sharing;

[0030] Close interaction between NR and E-UTRA, support for network slicing.

[0032] AMF (1a-07) hosts functions such as NAS signaling, NAS signal security, AS security control, S-GW selection, authentication, mobility management, and location management.

[0033] UPF (1a-08) hosts functions such as packet routing and forwarding, transport-level packet marking for uplink and downlink, QoS management, and mobility anchoring for mobility.

[0035] Figure 1b is a diagram illustrating the wireless protocol structure of a 5G system.

[0036] The user plane protocol stack is configured as SDAP (1b-01 to 1b-02), PDCP (1b-03 to 1b-04), RLC (1b-05 to 1b-06), MAC (1b-07 to 1b-08), and PHY (1b-09 to 1b-10). The control plane protocol stack is configured as NAS (1b-11 to 1b-12), RRC (1b-13 to 1b-14), PDCP, RLC, MAC, and PHY.

[0037] Each protocol sublayer performs functions related to the operations listed in the table below.

[0038] Sublayer Functions NAS Authentication, mobility management, security control, etc. RRC System information, paging, RRC connection management, security features, signaling wireless bearer and data wireless bearer management, mobility management, QoS management, detection and recovery from wireless link errors, NAS message transmission, etc. SDAP Mapping between QoS flows and data wireless bearers, marking of QoS flow IDs (QFI) of DL and UL packets. PDCP Data transmission, header compression and decompression, encryption and decryption, integrity protection and verification, redundant transmission, reordering and order delivery, etc. RLC Upper layer PDU transmission, error correction via ARQ, splitting and re-splitting of RLC SDUs, reassembly of SDUs, RLC re-establishment, etc. MAC Mapping between logical channels and transmission channels, multiplexing / demultiplexing MAC SDUs belonging to one or another logical channel within a transmission block (TB) delivered at the physical layer, information reporting scheduling, priority processing between UEs, priority processing between single UE logical channels, etc. PHY Channel coding, physical layer hybrid-ARQ processing, rate matching, scrambling, modulation, layer mapping, downlink control information, uplink control information, etc.

[0041] FIG. 1c is a drawing illustrating the structure of a location identification system according to one embodiment of the present disclosure.

[0042] The terminal (1c-03) is connected to the LMF (1c-33) via the gNB (1c-13) and AMF (1c-23). ​​Hereinafter, the gNB is also referred to as the base station, the AMF as the access mobility function, and the LMF as the location management function.

[0043] The base station provides TRP functions. The AMF stores terminal performance related to location identification and mediates signaling between the location management function and the terminal. An AMF can be connected to multiple base stations. A single AMF can be connected to multiple LMFs. An AMF can initially select an LMF for any terminal. When the terminal moves to a new cell, the AMF can select a different LMF.

[0044] LMF manages the support of various location services for the target terminal, including terminal location verification and the delivery of help data to the terminal.

[0045] The LMF can provide help data when a specific location service is requested, or interact with the target terminal to obtain a location estimate when requested.

[0046] To locate the target terminal, the LMF determines the location verification method to use.

[0047] The location determination method can calculate location estimates for terminal-based location determination methods and / or terminal-supported and network-based location determination methods. The LMF can combine all received results and determine a single location estimate for the target terminal. It can also determine additional information, such as the accuracy of location estimates and speeds.

[0048] Terminal (1c-43) is connected to Terminal (1c-03) via a PC5 interface and a sidelink. Terminal (1c-43) and Terminal (1c-03) can perform sidelink positioning based on SL-PRS.

[0049] FIG. 1d is a diagram illustrating a protocol layer structure for signaling between a location management function and a terminal according to one embodiment of the present disclosure.

[0050] The terminal and the LMF exchange signaling through the FPP (1d-03). The FPP defines various control messages related to location verification. The FPP control messages are included in the NAS (1d-13) message and transmitted to the AMF, and the AMF transmits the FPP control messages included in the NAS message to the LMF.

[0051] FPP (First Positioning Protocol) is a protocol that controls various positioning methods based on DL-PRS and SRS.

[0052] One terminal and another terminal, or one terminal and an LMF, exchange sidelink-related signaling via SPP (1d-23). ​​SPP (Second Positioning Protocol) control messages are included in FPP control messages and transmitted and received.

[0053] SPP is a protocol that controls side-link positioning.

[0055] The following terms are used interchangeably in this specification.

[0056] Target device and target UE, SL-PRS and sidelink positioning, Type 1 UE and target UE, Type 2 UE and anchor UE, positioning and positioning.

[0057] An anchor UE is a UE that supports the positioning of a target UE by transmitting and receiving reference signals for positioning and providing positioning-related information through the PC5 interface.

[0058] The target UE is the UE to be positioned.

[0059] Sidelink positioning is a positioning method in which a terminal obtains absolute position, relative position, or ranging information using a reference signal transmitted through the SL, i.e., the PC5 interface.

[0060] Downlink positioning is the positioning of a UE using a reference signal transmitted through the downlink.

[0062] For synchronization at the Uu interface, the UE receives a synchronization signal and a PBCH block (SSB) from the GNB.

[0063] To synchronize with another UE on the PC5 interface, the UE receives an S-SS / PSBCH block from another UE.

[0064] The SSB is configured with the primary synchronization signal, the secondary synchronization signal, and the PBCH. In the time domain, the SSB is transmitted through six consecutive symbols of a slot. The slot occurs periodically.

[0065] The S-SS / PSBCH block is transmitted through 13 symbols of the slot. The slot occurs every 16 frames.

[0067] FIG. 2a illustrates a positioning operation performed based on DL-PRS and SL-PRS.

[0068] In 2a-11, the first UE receives SystemInformationBlock12 from the GNB in ​​the first cell. SystemInformationBlock12 includes the fields IE SL-ConfigCommonNR, IE SL_Pos_ConfigCommon, and sl-PositioningAllowed.

[0069] The sl-PositioningAllowed field indicates sidelink positioning support in the first cell if present.

[0070] IE SL-ConfigCommonNR represents the configuration of NR sidelink communication and discovery.

[0071] IE Sl_Pos_ConfigCommon represents the configuration of the NR sidelink for SL-PRS transmission and reception.

[0073] IE SL-ConfigCommonNR includes the following IE and fields.

[0074] One or more SL-FreqConfigCommon IEs. Each SL-FreqConfigCommon IE specifies cell-specific configuration information for one specific carrier frequency for NR sidelink communication.

[0075] One or more SL-RadioBearerConfig IEs. Each SL-RadioBearerConfig IE specifies sidelink DRB configuration information for NR sidelink communication.

[0076] One or more SL-RLC-BearerConfig IEs. Each SL-RLC-BearerConfig IE specifies SL RLC bearer configuration information for NR sidelink communication.

[0077] SL-MeasConfigCommon IE. This IE represents the measurement configuration (e.g., RSRP) for NR sidelink communication.

[0079] Each SL-FreqConfigCommon IE includes the following IE and fields.

[0080] The sl-AbsoluteFrequencyPointA field represents the absolute frequency of the reference resource block (Common RB 0).

[0081] The sl-AbsoluteFrequencySSB field indicates the frequency position of the sidelink SSB.

[0082] One or more SL-BWP-ConfigCommon IEs. Each SL-BWP-ConfigCommon is used to configure cell-specific configuration information for one specific sidelink bandwidth portion.

[0083] One or more SL-SyncConfig IEs. Each SL-SyncConfig IE specifies configuration information regarding the reception of synchronization signals from adjacent cells and the transmission of synchronization signals for sidelink communication.

[0085] Each SL-BWP-ConfigCommon includes the following IE and fields.

[0086] SL-BWP-Generic IE. This IE represents the general parameters of the configured sidelink BWP. This IE includes the following fields.

[0087] sl-LengthSymbols indicates the number of symbols used for side links in slots without SL-SSB.

[0088] The sl-StartSymbol field indicates the start symbol used for the side link in the slot without SL-SSB.

[0089] The locationAndBandwidth field indicates the frequency domain location and bandwidth of this bandwidth portion. The field value is interpreted as a RIV (Resource Indicator Value).

[0090] subcarrierSpacing indicates the subcarrier spacing to be used in this BWP for all channels and reference signals.

[0092] SL-BWP-PoolConfigCommon IE. This IE represents the resource pool configuration of the configured sidelink BWP. This IE includes one or more SL-ResourcePool IEs for NR sidelink communication reception (i.e., reception resource pool) and one or more SL-ResourcePool IEs for NR sidelink communication transmission (i.e., transmission resource pool). Each of the one or more transmission resource pools is associated with an SL-ResourcePoolID.

[0093] SL-BWP-DiscPoolConfigCommon IE. This IE represents the configuration of a resource pool dedicated to NR sidelink discovery in a configured sidelink BWP. This IE includes one or more SL-ResourcePool IEs for resource pools dedicated to NR sidelink discovery.

[0095] Each SL-ResourcePool IE includes the following IE and fields.

[0096] sl-NumSubchannel represents the number of subchannels in the corresponding resource pool configured only with adjacent PRBs.

[0097] The sl-RB-Number field indicates the number of PRBs within the resource pool that are set only to adjacent PRBs.

[0098] sl-StartRB-Subchannel represents the lowest RB index of the subchannel having the lowest index in the resource pool for the lowest RB index of the SL BWP.

[0099] sl-SubchannelSize represents the minimum particle size in the frequency domain for sensing PSSCH resource selection in PRB units.

[0100] sl-SyncAllowed indicates a synchronization reference allowed to use the configured resource pool.

[0101] sl-TimeResource represents a bitmap in a resource pool, which is defined by iterating through the bitmap periodically during an SFN or DFN period.

[0102] sl_Pos_Allowed indicates that a resource pool with sidelink positioning enabled is available. SL-ResourcePool is used for sidelink positioning if SL_Pos_ResourcePool is not set.

[0104] SL-PSCCH-Configuration IE. This IE represents the PSCCH configuration. This IE includes the following fields.

[0105] The sl-FreqResourcePSCCH field indicates the number of PRBs for PSCCH in the resource pool. sl-DMRS-ScrambleID indicates the initialization value for PSCCH DMRS scrambling. sl-NumReservedBits indicates the number of reserved bits for the first stage SCI. sl-TimeResourcePSCCH indicates the number of symbols for PSCCH in the resource pool.

[0107] SL-PSSCH-Configuration IE. This IE represents the PSSCH configuration. This IE includes the following fields.

[0108] sl-BetaOffsets2ndSCI represents a candidate beta offset value for determining the number of coded modulation symbols for the second stage SCI.

[0109] sl-PSSCH-DMRS-TimePatternList represents a set of PSSCH DMRS time domain patterns in terms of PSSCH DMRS symbols in slots available for use in the resource pool.

[0111] SL-PowerControl IE. This IE represents the power control configuration. This IE includes the following fields.

[0112] sl-MaxTransPower represents the maximum value of the UE's sidelink transmission power for this resource pool. The unit is dBm.

[0114] IE Sl_Pos_ConfigCommon includes the following IE and fields.

[0115] One or more Sl_Pos_ResourcePool IEs. Each Sl_Pos_ResourcePool IE specifies cell-specific configuration information for one specific resource pool for NR sidelink positioning.

[0116] Sl_Pos_subcarrierSpacing indicates the subcarrier spacing to be used for sidelink positioning. It applies to all resource pools set by SL_Pos_ResourcePool IE.

[0118] Each Sl_Pos_ResourcePool IE contains the following IE and fields.

[0119] Sl_Pos_ResourcePoolID represents the index (or ID) of the resource pool used for sidelink positioning (or SL-PRS transmission and reception).

[0120] Sl_Pos_AbsoluteFrequency represents the absolute frequency of the lowest PRB in the resource pool.

[0121] Sl_Pos_StartPRB specifies a start PRB index defined as an offset from subcarrier 0 to common resource block 0 for the corresponding resource pool.

[0122] Sl_Pos_RB-Number represents the number of PRBs within the resource pool that are set to only adjacent PRBs.

[0123] Sl_Pos_LengthSymbols indicates the number of symbols used for sidelink positioning in slots without SL-SSB.

[0124] The Sl_Pos_StartSymbol field represents the start symbol used for sidelink positioning in slots without SL-SSB.

[0125] Sl_Pos_TimeResource represents a bitmap in a resource pool, which is defined by periodically iterating through the bitmap during an SFN or DFN cycle.

[0127] In 2a-16, the LMF decides to perform positioning of the first UE.

[0128] In 2a-21, the LMF sends a RequestCapabilities message to the first UE. The RequestCapabilities message includes NR-DL-TDOA-RequestCapabilities IE and NR_SL_Positioning_RequestCapabilities IE.

[0130] IE NR-DL-TDOA-RequestCapabilities is used to request NR DL-TDOA positioning capabilities from the target device to the location server. NR DL-TDOA positioning is performed based on DL-PRS.

[0132] IE NR_SL_Positioning_RequestCapabilities is used by the location server to request NR sidelink positioning capabilities from the target device. Sidelink positioning is performed based on SL-PRS.

[0133] In 2a-26, the first UE transmits ProvideCapabilities to the LMF. ProvideCapabilities includes IE NR-DL-TDOA-ProvideCapabilities and IE NR_SL_Positioning_ProvideCapabilities.

[0135] IE NR-DL-TDOA-ProvideCapabilities includes the mg-ActivationRequest field, the supportOfDL-PRS-RSRP-MeasFR1 field, and the supportOfDL-PRS-RSRP-MeasFR2 field.

[0136] The mg-ActivationRequest field indicates that the target device supports a low-latency measurement gap activation request for DL-PRS measurements.

[0137] The supportOfDL-PRS-RSRP-MeasFR1 field indicates whether the target device supports DL-PRS measurements for RSRP in FR1.

[0138] The supportOfDL-PRS-RSRP-MeasFR2 field indicates whether the target device supports DL-PRS measurements for RSRP in FR2.

[0140] IE NR_SL_Positioning_ProvideCapabilities includes the supportOfSL_PRS_RSRP_MeasFR1 field, the supportOfSL_PRS_RSRP_MeasFR2 field, the supportOfSL_PRS_TxFR1 field, the supportOfSL_PRS_TxFR2 field, and the supportOfSL_PRS_ActivationRequest field.

[0141] The supportOfSL_PRS_RSRP_MeasFR1 field indicates whether the target device supports SL-PRS measurements for RSRP in FR1.

[0142] The supportOfSL_PRS_RSRP_MeasFR2 field indicates whether the target device supports SL-PRS measurements for RSRP in FR2.

[0143] The supportOfSL_PRS_TxFR1 field indicates whether the target device supports SL-PRS transmission on FR1.

[0144] The supportOfSL_PRS_TxFR2 field indicates whether the target device supports SL-PRS transmission in FR2.

[0145] The supportOfSL_PRS_ActivationRequest field indicates that the target device supports SL-PRS activation requests via SL MAC CE.

[0146] SL MAC CE is a MAC CE transmitted and received via a side link.

[0147] In 2a-31, the target UE performs NR sidelink discovery to find a candidate for the anchor UE. The first UE discovers the second UE as a candidate for the anchor UE.

[0148] In 2a-36, the second UE transmits a first SPP message to the first UE. The first SPP message includes IE_related_to_high_layer_anchor_UE_ID and 5G-S-TMSI IE.

[0149] IE_related_to_high_layer_anchor_UE_ID is the pos_5G-S-TMSI of the second UE.

[0150] 5G-S-TMSI stands for 5G-S-Temporary Mobile Subscription Identifier (5G-S-TMSI), which is a temporary UE ID provided by 5GC (AMF) that uniquely identifies a UE within a trace area.

[0151] Pos_5G-S-TMSI is a temporary UE ID provided by the LMF in the ProvideCapabilities message, the ProvideAssistanceData message, or the fifth SPP message.

[0152] One Pos_5G-S-TMSI is associated with one 5G-S-TMSI. Both are 48-bit.

[0153] 5G-S-TMSI is used by the AMF to uniquely identify the corresponding UE within the tracking area.

[0154] Pos_5G-S-TMSI is used to uniquely identify the corresponding UE within the tracking area during the positioning session by LMF.

[0156] IE_related_to_anchor_UE_ID represents the UE ID of the anchor UE. It includes the SL-SourceIdentity (or Layer-2 ID) of the second UE.

[0157] SL-SourceIdentity is used to identify the destination of NR sidelink communication. It is 24 bits long.

[0158] In 2a-41, the first UE sends a RequestAssistanceData message to the LMF. The RequestAssistanceData message includes the following fields and an IE.

[0159] The nr-PhysCellID field specifies the NR physical cell ID of the current primary cell of the target device.

[0160] The nr-AdType field indicates the requested assistance data. dl-prs means that the requested assistance data is nr-DL-PRS-AssistanceData. sl_prs means that the requested assistance data is assistance data for a sidelink PRS.

[0161] One or more IE_related_to_high_layer_anchor_UE_IDs. Each IE_related_to_high_layer_anchor_UE_ID indicates a candidate type2 UE found during the sidelink discovery process.

[0162] IE_related_to_high_layer_target_UE_ID is the pos_5G-S-TMSI of the first UE.

[0163] preferred_SL_PRS IE represents the preferred SL PRS configuration.

[0164] In 2a-46, the first UE receives a ProvideAssistanceData message from the LMF. The ProvideAssistanceData message includes the following fields and an IE.

[0165] The nr-DL-PRS-AssistanceData field specifies the support data reference and adjacent TRPs, and provides the DL-PRS configuration for the TRPs.

[0166] IE_related_to_selected_UE-ID includes the pos_5G-S-TMSI of the type2 UE (or anchor UE) selected for sidelink positioning (the second UE in this example).

[0167] LMF selects an anchor UE from the candidate UEs reported in RequestedAssistanceData.

[0168] In 2a-51, the second UE receives a second SPP message from the LMF. The purpose is to provide information related to the second UE for sidelink positioning.

[0169] The LMF can receive one or more IE_related_to_high_layer_anchor_UE_IDs. The LMF selects one of them for the type 2 UE of sidelink positioning. The LMF sends a second SPP message to the selected type 2 UE.

[0170] The second SPP message includes the following fields and IE.

[0171] The IE_related_to_target_UE ID represents the type1 UE of the sidelink positioning (the first UE in this example). It includes the pos_5G-S-TMSI of the first UE.

[0172] preferred_SL_PRS IE represents the preferred SL PRS configuration.

[0173] The second UE can prepare the necessary SL-PRS configuration based on the information of the preferred_SL_PRS IE.

[0174] In 2a-56, the first UE receives a RequestLocationInformation message from the LMF. The LMF may decide to command the first UE and the second UE to perform positioning measurements. The LMF transmits the RequestLocationInformation message to the target device.

[0175] RequestLocationInformation includes the following IE and fields.

[0176] The locationInformationType field indicates whether the server requires location estimation or measurement. If 'locationEstimateRequired', the target device must return a location estimate. If 'locationMeasurementsRequired', the target device must return measurements.

[0177] The TriggeredReporting field indicates that a triggered report has been requested.

[0178] The periodicalReporting field indicates that periodic reporting is requested.

[0179] IE NR-DL-AoD-RequestLocationInformation is used by the location server to request NR DL-AoD location measurements from a target device based on DL-PRS.

[0180] IE NR_SL_RequestLocationInformation is used by the location server to request NR SL location measurements from the target device based on SL-PRS.

[0181] NR_SL_RequestLocationInformation IE includes the following fields and IE.

[0182] IE_related_to_LOS contains information indicating that the target device has been requested to provide the indicated type and unit of the estimated LOS-NLOS-Indicator for SL-PRS.

[0183] The nr-SL_PRS_RstdMeasurementInfoRequest field indicates whether the target device requests to report the SL-PRS resource ID(s) or SL-PRS resource set ID(s) used to determine the timing of each UE in RSTD measurements.

[0184] The NR_SL_AssistanceAvailability field indicates whether the target device can request additional SL-PRS assistance data from the anchor UE. TRUE means allowed, and FALSE means not allowed.

[0185] The Sl-lowerRxBeamSweepingFactor-FR2 field indicates that the target device is requested to use an Rx beam sweeping factor lower than 8 for FR2 for SL-PRS measurements.

[0186] IE_related_to_high_layer_anchor_UE_ID includes the UE identifier of the type2 UE (or anchor UE). The UE identifier may be the pos_5G-S-TMSI of the second UE.

[0187] In 2a-61, the first UE performs a DL PRS measurement based on the ProvideAssisanceData message and the RequestLocationInformation message. When the DL PRS measurement is completed, the first UE performs a DL PRS measurement report to the LMF.

[0188] In 2a-66, the first UE and the second UE perform SL PRS setup and SL PRS measurement. When the SL PRS measurement is completed, the first terminal and the second terminal report the SL-PRS measurement to the LMF.

[0189] In 2a-71, LMF determines the location of the UE based on the reported measurement results.

[0191] Figure 2b illustrates DL PRS measurement / reporting and SL PRS setup / measurement / reporting.

[0192] In 2b-11, the GNB transmits DL-PRS. DL-PRS is transmitted according to the nr-DL-PRS-AssistanceData field of the ProvideAssistanceData message.

[0193] A UE may be configured with one or more DL PRS resource set configuration(s). Each DL PRS resource set is configured with one or more DL PRS resources, each having an associated spatial transfer filter.

[0194] The DL PRS resource set is configured by NR-DL-PRS-ResourceSet. The DL PRS resource set is configured with one or more DL PRS resources.

[0195] The DL PRS resource set is defined by the following fields included in NR-DL-PRS-ResourceSet IE.

[0196] The nr-DL-PRS-ResourceSetID field defines the ID of the DL PRS resource set configuration.

[0197] The dl-PRS-Periodicity-and-ResourceSetSlotOffset field defines the DL PRS resource periodicity and slot offset for a DL PRS resource set for SFN0 slot 0. All DL PRS resources within a single DL PRS resource set are set to the same DL PRS resource periodicity.

[0198] dl-PRS-ResourceRepetitionFactor defines the number of times each DL-PRS resource is repeated for a single instance of a DL-PRS resource set.

[0199] The dl-PRS-ResourceTimeGap field defines the slot-number offset between two repeated instances of a DL PRS resource having the same nr-DL-PRS-ResourceID within a single instance of a DL PRS resource set.

[0201] The NR-DL-PRS-SFN0-Offset field defines the time offset of SFN0 slot 0 for the DL PRS resource set for SFN0 slot 0 of the reference provided by nr-DL-PRS-ReferenceInfo. The nr-DL-PRS-ReferenceInfo field includes DL-PRS-ID-Info IE. DL-PRS-ID-Info IE includes the dl-PRS-ID field and the nr-DL-PRS-ResourceSetID field.

[0202] The dl-PRS-ResourceList field determines the DL PRS resources contained within a single DL PRS resource set. This includes one or more nr-DL-PRS-Resource IEs.

[0203] The dl-PRS-ResourceBandwidth field defines the number of resource blocks set for DL ​​PRS transmission. The parameter has four PRB units containing a minimum of 24 PRBs and a maximum of 272 PRBs. All DL PRS resource sets within the positioning frequency layer have the same dl-PRS-ResourceBandwidth value.

[0204] The dl-PRS-StartPRB field defines the start PRB index of the DL PRS resource for reference point A, where reference point A is provided by the upper layer parameter dl-PRS-PointA.

[0205] The dl-PRS-NumSymbols field defines the number of symbols for DL ​​PRS resources within a slot.

[0207] DL PRS resources are defined by the following fields.

[0208] The nr-DL-PRS-ResourceID field determines the DL PRS resource configuration ID. All DL PRS resource IDs are defined locally within the DL PRS resource set.

[0209] The dl-PRS-SequenceID field is used to initialize a pseudo-random sequence generator for generating a DL PRS sequence for a given DL PRS resource.

[0210] The dl-PRS-CombSizeN-AndReOffset field defines the starting RE offset of the first symbol within the DL PRS resource at a given frequency. The relative RE offset of the remaining symbols within the DL PRS resource.

[0211] The dl-PRS-ResourceSlotOffset field determines the starting slot of the DL PRS resource for the corresponding DL PRS resource set slot offset.

[0212] The dl-PRS-ResourceSymbolOffset field determines the starting symbol of the slot set as a DL PRS resource.

[0213] The dl-PRS-QCL-Info field defines information regarding any similar or identical location of DL PRS resources with other reference signals. DL PRS is set to QCL 'typeD' with DL PRS associated with the same dl-PRS-ID, or rs-Type is set to 'typeC', 'typeD', or 'typeC-plus-typeD' with SS / PBCH blocks from serving or non-serving cells.

[0215] The first UE determines the first slot for the DL PRS resource based on dl-PRS-Periodicity-and-ResourceSetSlotOffset, dl-PRS-ResourceSlotOffset, dl-PRS-ResourceRepetitionFactor, and dl-PRS-ResourceTimeGap.

[0216] The first UE determines the first symbol for the DL PRS resource based on dl-PRS-ResourceSymbolOffset and dl-PRS-NumSymbols.

[0217] The first terminal determines a second symbol for the DL PRS resource by excluding the symbol used by the SS / PBCH block in the serving cell where the DL-PRS is transmitted.

[0218] The first UE measures the DL-PRS resource at the second symbol of the first slot.

[0220] In 2b-16, the first UE sends a ProvideLocationInformation message to the LMF. The purpose is to provide the LMF with the measurement results for DL-PRS.

[0221] ProvideLocationInformation includes the following IE and fields.

[0222] The locationEstimate field provides a location estimate using one of the geographic shapes.

[0223] The velocityEstimate field provides a velocity estimate using one of the velocity shapes.

[0224] IE_related_to_more_report contains information indicating whether to send more positioning measurement reports and the type of positioning measurement report. The type may be sidelink positioning (or positioning measurement results based on SL-PRS).

[0225] The dl-PRS-ID field is used along with the DL-PRS resource set ID and DL-PRS resource ID to uniquely identify a DL-PRS resource.

[0226] The nr-PhysCellID field specifies the physical cell ID of the associated TRP (or serving cell).

[0227] The nr-CellGlobalID field specifies the NCGI, which is the globally unique ID of the cell in the NR of the associated TRP (or serving cell).

[0228] The nr-ARFCN field specifies the NR-ARFCN of the CD-SSB of the TRP corresponding to nr-PhysCellID.

[0229] The nr-TimeStamp field specifies the time instance in which TOA and DL PRS-RSRP / RSRPP (if included) measurements are performed. The nr-SFN and nr-Slot of IE NR-TimeStamp correspond to the TRP provided in dl-PRS-ReferenceInfo.

[0230] The nr-DL-PRS-RSRP-Result field specifies the NR DL-PRS reference signal received power (DL PRS-RSRP) measurement.

[0231] The nr-los-nlos-IndicatorPerResource field specifies the best estimate of the target device for the LOS or NLOS of the TOA measurement for resources.

[0232] LMF considers the above information when estimating the UE location.

[0234] In 2b-21, the first UE transmits the UEAssistanceInformationSidelink message to the second UE. The purpose is to inform the second UE that the first UE requires SL-PRS transmission from the second UE.

[0235] The UEAssistanceInformationSidelink message includes the following IE and fields.

[0236] preferred_SL_PRS represents the requested SL-PRS configuration that the target UE provides to the anchor UE to determine the SL-PRS configuration.

[0237] related_to_target_UE_ID represents the UE ID of the target UE. This includes the C-RNTI of the first UE or the Layer-2 ID of the first UE.

[0239] preferred_SL_PRS includes the following fields.

[0240] Time_To_Complete indicates the time when sidelink positioning must be completed (or the time when SL-PRS measurement must be completed or SL-PRS transmission must begin). It is absolute time information such as UTC time or GNSS time. Or it may be relative time information such as the number of SFNs or msec.

[0241] Duration_SL_PRS indicates how long SL-PRS transmission and reception should be sustained. It indicates the number of slots. The length of the slot is determined based on the SCS of the sidelink resource pool indicated by Resource_Pool_index_SL_PRS. Therefore, the actual length of the required SL-PRS transmission and reception is determined by the value indicated in Sl_Pos_subcarrierSpacing and the value indicated in Duration_SL_PRS.

[0242] Periodicity_SL_PRS indicates the preferred periodicity of the SL-PRS. The unit is a slot. The length of the unit is determined based on the SCS of the sidelink resource pool indicated by Resource_Pool_index_SL_PRS. Therefore, the actual length of the periodicity is determined by the value indicated in Sl_Pos_subcarrierSpacing and the value indicated in Periodicity_SL_PRS.

[0243] Bandwidth_SL_PRS represents the preferred bandwidth of the SL-PRS. The unit is 4 PRBs. The bandwidth of the PRB is determined based on the SCS of the sidelink resource pool indicated by Resource_Pool_index_SL_PRS.

[0244] FR_SL_PRS indicates the preferred frequency range of the sidelink resource pool. The UE includes this field if the preferred FR is different from the PCell's FR (or the specific serving cell's FR if the specific serving cell is the cell where the resource pool is configured).

[0245] Resource_Pool_index_SL_PRS indicates the preferred resource pool for the SL-PRS (or SL location). It represents one of the Sl_Pos_ResourcePoolIDs.

[0247] In 2b-26, the second UE sends a SidelinkUEInformationNR message to the GNB. The purpose is to request SL-PRS configuration from the GNB.

[0248] The SidelinkUEInformationNR message includes the requests_SL_PRS IE and ue_Type2 fields and the sl_Pos_Tx_Interested field and the IE_related_to_target_UE_ID and IE_related_to_anchor_UE_ID.

[0249] The Ue_Type2 field indicates a type1 UE (target UE) or a type2 UE (anchor UE).

[0250] The sl_Pos_Tx_Interested field indicates "true". If this field is included, it indicates that the UE is interested in SL-PRS transmission. Alternatively, the sl_Pos_Interested field may be used. The field may indicate transmission, reception, or both.

[0251] IE_related_to_target_UE_ID represents the UE ID of the target UE. It is the C-RNTI or SL-SourceIdentity of the first UE. The SL-SourceIdentity includes the Layer-2 ID of the first UE.

[0252] IE_related_to_anchor_UE_ID represents the UE ID of the anchor UE. This includes SL-DestinationIdentity. SL-DestinationIdentity includes the Layer-2 ID of the second UE.

[0253] The C-RNTI is assigned by the GNB and has a length of 16 bits. The Layer 2-ID is assigned by the sidelink server and has a length of 24 bits. The C-RNTI is used for PDSCH / PUSCH operations on the Uu interface. The Layer 2-ID is used for sidelink communication on the PC5 interface.

[0254] Requested_SL_PRS represents the requested SL-PRS configuration provided by the anchor UE to the GNB to determine the SL-PRS configuration.

[0255] Requested_SL_PRS includes the following fields.

[0256] Time_To_Complete indicates the time when sidelink positioning must be completed (or the time when SL-PRS measurement must be completed or SL-PRS transmission must begin).

[0257] Duration_SL_PRS indicates how long SL-PRS transmission and reception should be sustained. A unit is a slot. The length of the unit is determined based on the SCS of the sidelink resource pool indicated by Resource_Pool_index_SL_PRS.

[0258] Periodicity_SL_PRS represents the periodicity of the requested SL-PRS in the number of slots. The length of the unit is determined based on the SCS of the sidelink resource pool indicated by Resource_Pool_index_SL_PRS.

[0259] Bandwidth_SL_PRS represents the requested bandwidth of SL-PRS. The unit is 4 PRBs. The bandwidth of a PRB is determined based on the SCS of the sidelink resource pool indicated by Resource_Pool_index_SL_PRS.

[0260] FR_SL_PRS indicates the requested frequency range of the sidelink resource pool. The UE includes this field if the requested FR is different from the PCell's FR (or the specific serving cell's FR if the specific serving cell is a cell with a sidelink configured).

[0261] Resource_Pool_index_SL_PRS represents the resource pool requested for SL-PRS (or SL locating). It is a pair of Sl_Pos_ResourcePoolID or SL BWP ID and SL-ResourcePoolID.

[0262] In 2b-31, the second UE receives an RRCReconfiguration message from the GNB. The purpose is to configure SL-PRS transmission and SLRB (SideLink Radio Bearer) for the second UE.

[0263] The RRCReconfiguration message includes the following IE and fields.

[0264] One or more NR-SL_PRS_ResourceSet IE, Sl_Pos_ResourcePool IE and SL-RadioBearerConfig IE and SL-RLC-ChannelConfig IE.

[0265] Instead of Sl_Pos_ResourcePool IE, Sl_Pos_ResourcePoolID IE may be included to indicate the configuration of the resource pool for sidelink positioning. Sl_Pos_ResourcePoolID represents the sl_Pos_ResourcePool included in the system information.

[0266] If a resource pool for sidelink positioning is not configured, the configuration of the resource pool may be specified by including a pair of SL BWP ID and SL-ResourcePoolID. The SL BWP ID and SL-ResourcePoolID represent the SL_ResourcePool included in the system information.

[0268] SL-RadioBearerConfig IE includes the following fields for the sidelink radio bearer for SPP messages.

[0269] The sl-PDCP-Config field represents the PDCP parameters for the sidelink wireless bearer.

[0270] The sl-SDAP-Config field indicates how to map sidelink QoS flows to the sidelink wireless bearer.

[0271] The sl-TransRange field indicates the transmission range of the sidelink wireless bearer. The unit is meters.

[0273] SL-RLC-ChannelConfig IE includes the following fields for sidelink wireless bearers for SPP messages.

[0274] The sl-MAC-LogicalChannelConfig field is used to configure MAC SL logical channel parameters.

[0275] sl-RLC-Config represents the RLC mode (UM, AM) and provides the corresponding parameters.

[0276] sl-PacketDelayBudget represents the packet delay budget for the PC5 relay RLC channel. The upper limit of the delay a packet can experience is indicated in units of 0.5ms.

[0277] NR-SL_PRS_ResourceSet IE includes the following fields and IE.

[0278] The nr-SL_PRS_ResourceSetID field defines the ID of the SL PRS resource set configuration.

[0279] The SL_PRS_Periodicity-and-ResourceSetSlotOffset field defines the SL PRS resource periodicity and slot offset for the SL PRS resource set for SFN0 slot 0 (or DFN0 slot 0). All SL PRS resources within a single SL PRS resource set are set to the same SL PRS resource period.

[0280] SL_PRS_ResourceRepetitionFactor defines the number of times each SL-PRS resource is repeated for a single instance of an SL-PRS resource set.

[0281] The SL_PRS_ResourceTimeGap field defines the slot-number offset between two iteration instances of an SL PRS resource having the same nr-SL_PRS_ResourceID within a single instance of an SL PRS resource set.

[0282] The NR_SL_PRS-SFN0-Offset field defines the time offset of SFN0 slot 0 (or DFN0 slot 0) for the SL PRS resource set for SFN0 slot 0 of the reference provided by nr_SL_PRS-ReferenceInfo. The nr_SL_PRS-ReferenceInfo field contains SL-PRS-ID-Info IE. SL-PRS-ID-Info IE contains the sl-PRS-ID field and the nr_SL_PRS-ResourceSetID field.

[0283] Alternatively, SL-PRS-ID-Info IE includes the ARFCN and PCI of the reference cell (for SFN0 slot0) or the Layer-2 ID of the reference UE.

[0285] The SL_PRS_ResourceList field determines the SL PRS resources contained within a single set of SL PRS resources. This includes one or more nr-SL_PRS_Resource IEs.

[0287] The SL_PRS_ResourceBandwidth field defines the number of resource blocks configured for SL PRS transmission. The parameter has four PRB units containing a minimum of 24 PRBs and a maximum of 272 PRBs. All SL PRS resources transmitted from a type2 UE have the same SL_PRS_ResourceBandwidth value.

[0288] The SL_PRS_StartPRB field defines the start PRB index of an SL PRS resource for reference point A, where reference point A is provided by the upper layer parameter SL_PRS_PointA. All SL PRS resources transmitted from a type2 UE have the same SL_PRS_StartPRB value.

[0289] The SL_PRS_NumSymbols field defines the number of symbols for SL PRS resources within a slot. All SL PRS resources transmitted from a type2 UE have the same SL_PRS_NumSymbols value.

[0290] Sl_PRS_PointA specifies the absolute frequency of the reference resource block for SL-PRS. A single SL-PRS Point A for SL-PRS resource allocation is provided per pair of Source Layer-2 ID and Destination Layer-2 ID. All SL-PRS resources belonging to the same SL-PRS resource set have the same SL-PRS Point A.

[0291] The SL PRS resource is defined by the following field of nr-SL_PRS_Resource IE.

[0292] The nr-SL_PRS_ResourceID field determines the SL PRS resource configuration ID. All SL PRS resource IDs are defined locally within the SL PRS resource set.

[0293] The Sl_PRS_SequenceID field is used to initialize a pseudo-random sequence generator for generating an SL PRS sequence for a given SL PRS resource.

[0294] The SL_PRS_CombSizeN-AndReOffset field defines the starting RE offset of the first symbol in the SL PRS resource at frequency. The relative RE offset of the remaining symbols in the SL PRS resource is defined based on the initial offset.

[0295] The SL_PRS_ResourceSlotOffset field determines the starting slot of the SL PRS resource for the corresponding SL PRS resource set slot offset.

[0296] The SL_PRS_ResourceSymbolOffset field determines the starting symbol of the slot set as an SL PRS resource.

[0297] SL_PRS-QCL-Info IE defines quasi-co-location information of any SL PRS resource with other reference signals. The SL PRS is set to QCL 'typeD' with the SL PRS associated with the same sl-PRS-ID, or the rs-Type is set to 'typeC', 'typeD', or 'typeC-plus-typeD' with the S-SS / PSBCH block from a serving or non-serving cell.

[0298] SL_PRS-QCL-Info IE contains the ssb-Index and the serving cell index, or the ssb-Index and the UE's Layer-2 ID. If only the ssb-Index exists and there is no Layer-2 ID, the corresponding SL PRS resource is located in the same position as the S-SS / PSBCH block (S-SSB) indicated from the anchor UE. If both the ssb-Index and the Layer-2 ID exist, the corresponding SL PRS resource is located in the same position as the S-SS / PSBCH block (S-SSB) indicated from the UE indicated by the Layer-2 ID.

[0299] In 2b-36, the second UE sends an RRCReconfigurationSidelink message to the first UE. The purpose is to provide information related to the first UE for sidelink positioning.

[0300] The RRCReconfigurationSidelink message includes the following IE and fields.

[0301] One or more NR-SL_PRS_ResourceSet IE, Sl_Pos_ResourcePool IE and SL-RadioBearerConfig IE and SL-RLC-ChannelConfig IE.

[0302] Instead of Sl_Pos_ResourcePool IE, Sl_Pos_ResourcePoolID IE may be included to indicate the configuration of the resource pool for sidelink positioning. Sl_Pos_ResourcePoolID represents the sl_Pos_ResourcePool indicated in the system information.

[0303] If a resource pool for sidelink positioning is not configured, the configuration of the resource pool can be specified by including a pair of SL BWP ID and SL-ResourcePoolID. SL BWP ID and SL-ResourcePoolID represent the SL_ResourcePool specified in the system information.

[0304] The first UE and the second UE establish PDCP entities, RLC entities, and logical channels of SL-SRB3 based on the specified configuration. The specified configuration is defined and fixed in the standard.

[0305] For NR-SL_PRS_ResourceSet IE, nr_SL_PRS_BeamInfo_List may be included instead of SL_PRS-QCL.

[0306] The nr_SL_PRS_BeamInfo_List field contains one or more NR_SL_PRS_BeamInfos. Each NR_SL_PRS_BeamInfo specifies beam information for each SL-PRS resource ID.

[0307] The first UE and the second UE configure the logical channels of the PDCP entity, the RLC entity, and the sidelink radio bearer for the SPP based on SL-RadioBearerConfig IE and SL-RLC-ChannelConfig IE. The sidelink radio bearer for the SPP is SL-SRB5 or SL-DRB.

[0309] Instead of providing the relevant IE for side link positioning to the first UE in RRCReconfigurationSidelink, the first UE can obtain the relevant IE from the GNB through SidelinkUEInformationNR and RRCReconfiguration.

[0310] In 2b-41, the first UE sends a SidelinkUEInformationNR message to the GNB. The purpose is to inform the GNB that the first UE requires SL-PRS transmission from the second UE.

[0312] The SidelinkUEInformationNR message includes the following IE and fields.

[0313] The SidelinkUEInformationNR message includes the preferred_SL_PRS IE and ue_Type2 fields, the sl_Pos_Rx_Interested field, and the IE_related_to_target_UE_ID and IE_related_to_anchor_UE_ID.

[0314] IE_related_to_anchor_UE_ID represents the UE ID of the anchor UE. It includes the C-RNTI or SL-DestinationIdentity of the second UE. The SL-DestinationIdentity SL-SourceIdentity includes the Layer-2 ID of the second UE.

[0315] IE_related_to_target_UE_ID represents the UE ID of the target UE. It includes the C-RNTI or SL-SourceIdentity of the first UE. The SL-SourceIdentity includes the Layer-2 ID of the first UE.

[0316] The Ue_Type field indicates a type1 UE (target UE) or a type2 UE (anchor UE). The first UE sets this field to a type1 UE.

[0317] The sl_Pos_Rx_Interested field indicates "true". If this field is included, it indicates that the UE is interested in receiving SL-PRS. Alternatively, the sl_Pos_Interested field may be used. The field may indicate transmission, reception, or both.

[0319] In 2b-46, the first UE receives an RRCReconfiguration message from the GNB. The purpose is to provide the first UE with an SL-PRS configuration.

[0320] The RRCReconfiguration message includes the following IE and fields.

[0321] One or more NR-SL_PRS_ResourceSet IE, Sl_Pos_ResourcePool IE and SL-RadioBearerConfig IE and SL-RLC-ChannelConfig IE and IE_related_to_anchor_UE_ID.

[0322] Instead of Sl_Pos_ResourcePool IE, Sl_Pos_ResourcePoolID IE may be included to indicate the configuration of the resource pool for sidelink positioning. Sl_Pos_ResourcePoolID represents the sl_Pos_ResourcePool indicated in the system information.

[0323] If a resource pool for sidelink positioning is not configured, the configuration of the resource pool can be specified by including a pair of SL BWP ID and SL-ResourcePoolID. SL BWP ID and SL-ResourcePoolID represent the SL_ResourcePool specified in the system information.

[0324] In 2b-51, the first UE transmits the first SL MAC CE to the second UE. The purpose is to request the second UE to enable SL-PRS transmission.

[0325] The MAC subheader of the first SL MAC CE includes the following fields.

[0326] The SRC field carries the top 16 bits of the Source Layer-2 ID set to the identifier provided by the upper layer. The length of the field is 16 bits. It is the top 16 bits of the Layer-2 ID of the first UE.

[0327] The DST field carries the top 8 bits of the Destination Layer-2 ID, which is set as an identifier provided by the upper layer. The length of the field is 8 bits. It is the top 8 bits of the Layer-2 ID of the second UE.

[0328] The LCID field identifies the logical channel instance of the corresponding MAC SDU or the type of the corresponding MAC CE within the range of a single Source Layer-2 ID and Destination Layer-2 ID pair. This field is set to a first specific value corresponding to the SL-PRS enable / disable request.

[0330] The first SL MAC CE includes the following fields.

[0331] The A / D field indicates whether to enable or disable the specified NR SL-PRS resource set. The field is set to 1 to indicate enable, otherwise it indicates disable. The first UE sets this field to 1.

[0332] The NR-SL_PRS_ResourceSet ID field contains the index of the NR-SL_PRS_ResourceSet representing the SL-PRS resource set to be enabled or disabled. The length of the field is 4 bits.

[0333] The Activation_Time field contains information about the desired activation time. The field indicates the SFN (or DFN) number and the subframe number. The first UE requests an NR SL-PRS transmission in the fastest (or first) slot of the indicated subframe of the indicated SFN (or DFN).

[0335] The first SL MAC CE is transmitted through a resource pool set by one of the SL-ResourcePool IEs of SIB12.

[0337] In 2b-56, the first UE receives the second SL MAC CE from the second UE. The purpose is to inform the first UE that the NR SL PRS resource set has been activated.

[0338] The second SL MAC CE includes the following fields.

[0340] The MAC subheader of the 2nd SL MAC CE includes the following fields.

[0341] The SRC field carries the top 16 bits of the Source Layer-2 ID set to the identifier provided by the upper layer. The length of the field is 16 bits. It is the top 16 bits of the Layer-2 ID of the second UE.

[0342] The DST field carries the top 8 bits of the Destination Layer-2 ID, which is set as an identifier provided by the upper layer. The length of the field is 8 bits. It is the top 8 bits of the Layer-2 ID of the first UE.

[0343] The LCID field identifies the logical channel instance of the corresponding MAC SDU or the type of the corresponding MAC CE within the range of a single Source Layer-2 ID and Destination Layer-2 ID pair. This field is set to a second specific value corresponding to the SL-PRS enable / disable command.

[0344] The second SL MAC CE includes the following fields.

[0345] The A / D field indicates whether to enable or disable the specified NR SL-PRS resource set. The field is set to 1 to indicate enable, otherwise it indicates disable. The second UE sets this field to 1.

[0346] NR-SL_PRS_ResourceSet ID: This field contains the index of the NR-SL_PRS_ResourceSet representing the SL-PRS resource set to be enabled or disabled. The length of the field is 4 bits.

[0347] The Activation_Time field contains information about the time instance for the activation time. The field indicates the SFN (or DFN) number and the subframe number. The second UE initiates NR SL-PRS transmission in the fastest (or first) slot of the indicated subframe of the indicated SFN (or DFN).

[0349] The second SL MAC CE is received from a resource pool set by one of the SL-ResourcePool IEs of SIB12.

[0351] The second UE transmits SL-PRS at the third symbol of the fourth slot on the first resource pool.

[0352] The first resource pool is set by Sl_Pos_ResourcePool IE in RRCReconfigurationSidelink or RRCReconfiguration.

[0353] Alternatively, the first resource pool is indicated by SL_Pos_ResourcePoolID IE in RRCReconfigurationSidelink or RRCReconfiguration and set by one of the SL_Pos_ResourcePool IEs in SIB12.

[0354] The second UE transmits the second MAC CE through the second resource pool. The second resource pool is configured by one of the SL-ResourcePool IEs of SIB12. The second resource pool is selected by the second UE from one or more resource pools.

[0355] The first UE receives and measures SL-PRS at the third symbol of the fourth slot on the first resource pool.

[0356] The first UE receives the second MAC CE on the second resource pool. The first UE monitors the third resource pool. The second resource pool is one of the third resource pools. The third resource pool is configured by the SL-ResourcePool IE of SIB12.

[0357] In 2b-61, the second UE transmits SL-PRS. The first UE receives and measures SL-PRS. SL-PRS is transmitted according to the NR-SL_PRS_ResourceSet IE indicated by the NR-SL_PRS_ResourceSet ID field in the second MAC CE.

[0359] The first UE receives and measures SL-PRS at the third symbol of the fourth slot on the first resource pool.

[0360] The second UE transmits SL-PRS at the third symbol of the fourth slot on the first resource pool.

[0361] The first terminal and the second terminal determine the second slot as follows.

[0362] The second slot is all slots except the next slot.

[0363] A slot in which an S-SS / PSBCH block (S-SSB) is set, and

[0364] A slot in which at least one of the Y-th, (Y+1)-th, …, (Y+X-1)-th OFDM symbols is not semi-statically set to UL according to sl-TDD-Configuration or tdd-UL-DL-ConfigurationCommon of the serving cell. Here, Y and X are set by the upper layer parameters sl-StartSymbol and sl-LengthSymbols, respectively.

[0366] The first UE and the second UE determine the third slots from the second slots based on S1_Pos_TimeResource.

[0367] Sl_Pos_TimeResource is a bitmap. Each bit corresponds to the second slot. When a bit is set to 1, the second slot corresponding to the bit is the third slot.

[0368] The first UE and the second UE determine the fourth slot among the third slots based on SL_PRS_Periodicity-and-ResourceSetSlotOffset.

[0369] The 4th slot occurs repeatedly in the 3rd slot set according to the period and offset derived from SL_PRS_Periodicity-and-ResourceSetSlotOffset.

[0370] The first UE and the second UE determine a third symbol from SL_PRS_NumSymbols and SL_PRS_ResourceSymbolOffset. The third symbol is a series of symbols having the length of SL_PRS_NumSymbols starting from the symbol indicated by SL_PRS_ResourceSymbolOffset.

[0371] After completing the measurement for SL-PRS, the first UE requests the second UE to disable SL-PRS transmission.

[0372] In 2b-66, the first UE transmits the first SL MAC CE to the second UE. The purpose is to request the second UE to disable SL-PRS transmission.

[0373] The A / D field of the first SL MAC CE is set to 0. When the A / D field is set to 0, the Activation_Time field is not included in the first MAC CE.

[0374] In 2b-71, the second UE transmits the second SL MAC CE to the first UE. The purpose is to inform the first UE that the NR SL PRS resource set has been activated.

[0375] The A / D field of the second SL MAC CE is set to 0. When the A / D field is set to 0, the Activation_Time field is not included in the first MAC CE.

[0376] In 2b-76, the first UE transmits a third SPP message to the LMF. The purpose is to report the SL-PRS measurement results of the first UE (or target UE) to the LMF.

[0377] The third SPP message includes the following fields and IE.

[0378] The SL_PRS_ID field is used along with the SL-PRS resource set ID and SL-PRS resource ID to uniquely identify SL-PRS resources.

[0379] IE_related_to_high_layer_anchor_UE_ID specifies the identifier of the anchor UE.

[0380] The nr_pos_TimeStamp field specifies the time instance in which TOA and SL PRS-RSRP / RSRPP (if included) measurements are performed. The nr-SFN and nr-Slot of IE NR_POS_TimeStamp correspond to the entities provided by sl-PRS-ReferenceInfo (i.e., anchor UE, GNB, or TRP).

[0381] The nr-SL_PRS-RSRP-Result field specifies the NR SL-PRS reference signal received power (SL PRS-RSRP) measurement.

[0382] The nr-los-nlos-IndicatorPerResource field specifies the best estimate of the target device for the LOS or NLOS of the TOA measurement for resources.

[0383] In 2b-81, the first UE transmits a fourth SPP message to the second UE. The purpose is to report the SL-PRS measurement results of the first UE to the second UE. The second UE estimates the location of the first UE based on the SL-PRS measurement report from the first UE.

[0384] The 4th SPP message includes the following fields.

[0385] The SL_PRS_ID field is used along with the SL-PRS resource set ID and SL-PRS resource ID to uniquely identify SL-PRS resources.

[0386] The nr_pos_TimeStamp field specifies the time instance in which TOA and SL PRS-RSRP / RSRPP (if included) measurements are performed. The nr-SFN and nr-Slot of IE NR_POS_TimeStamp correspond to the entities provided by sl-PRS-ReferenceInfo (i.e., anchor UE, GNB, or TRP).

[0387] The nr-SL_PRS-RSRP-Result field specifies the NR SL-PRS reference signal received power (SL PRS-RSRP) measurement.

[0388] The nr-los-nlos-IndicatorPerResource field specifies the best estimate of the target device for the LOS or NLOS of the TOA measurement for resources.

[0390] In 2b-86, the second UE transmits a third SPP message to the LMF. The third SPP message includes the SL-PRS measurement result provided by the first UE, the corresponding beam information held by the second UE, and the location information of the first UE estimated based on the two pieces of information.

[0391] The third SPP message includes the following IE and fields.

[0392] The locationEstimate field provides a location estimate using one of the geographic features (derived based on SL-PRS measurement results reported from the target UE).

[0393] The velocityEstimate field provides a velocity estimate using one of the velocity forms (derived based on SL-PRS measurement results reported from the target UE).

[0395] The SL_PRS_ID field is used along with the SL-PRS resource set ID and SL-PRS resource ID to uniquely identify SL-PRS resources.

[0396] IE_related_to_high_layer_target_UE_ID specifies the identifier of the target UE.

[0397] The nr_pos_TimeStamp field specifies the time instance in which TOA and SL PRS-RSRP / RSRPP (if included) measurements are performed. The nr-SFN and nr-Slot of IE NR_POS_TimeStamp correspond to the entities provided by sl-PRS-ReferenceInfo (i.e., anchor UE, GNB, or TRP).

[0398] The nr-SL_PRS-RSRP-Result field specifies the NR SL-PRS reference signal received power (SL PRS-RSRP) measurement. It includes the RSRP value and the SL-PRS resource ID.

[0399] The nr-los-nlos-IndicatorPerResource field specifies the best estimate of the target device for the LOS or NLOS of the TOA measurement for resources.

[0400] The nr_SL_PRS_BeamInfo_List field specifies beam information for each SL-PRS resource ID. The nr_SL_PRS_BeamInfo_List field contains one or more beam information.

[0401] Each beam information includes the following fields.

[0402] The sl-PRS-Azimuth field specifies the azimuth of the aiming direction in which the SL-PRS resource associated with this SL-PRS resource ID in the SL-PRS resource set is transmitted by the anchor UE. Scale 1 degree; range is 0 to 359 degrees.

[0403] The SL-PRS-Azimuth-fine field provides finer granularity for SL-PRS-Azimuth.

[0404] The total azimuth of the aiming direction is set to SL-PRS-Azimuth + SL-PRS-Azimuth-fine. Magnification 0.1 degrees; range is 0 to 0.9 degrees.

[0405] The SL-PRS-Elevation field specifies the elevation angle of the aiming direction transmitted by the anchor UE to the SL-PRS resource associated with this SL-PRS resource ID in the SL-PRS resource set. The magnification is 1 degree; the range is 0 to 180 degrees.

[0406] The SL-PRS-Elevation-fine field provides finer units for SL-PRS-Elevation. The total elevation angle of the aiming direction is specified as SL-PRS-Elevation + SL-PRS-Elevation-fine.

[0407] Magnification 0.1 degrees; range is 0 to 0.9 degrees.

[0408] The following is the terminal operation.

[0409] The first UE receives SIB12 from the first cell.

[0410] If SIB12 includes a sl-PositioningAllowed field set to a first value, the first UE initiates side-link positioning in the first cell.

[0411] If at least one sidelink positioning resource pool is indicated to SIB12, the first UE performs sidelink positioning based on the sidelink positioning resource pool.

[0412] If a sidelink positioning resource pool is not specified in SIB12, the first terminal performs sidelink positioning based on a specific sidelink resource pool. The configuration information of the specific sidelink resource pool includes a sl_Pos_Allowed field set to the first value.

[0413] The first UE transmits ProvideCapabilities to the LMF. ProvideCapabilities includes IEs associated with DL PRSs and IEs associated with SL PRSs.

[0414] The IE associated with DL-PRS includes the supportOfDL-PRS-RSRP-MeasFR1 and supportOfDL-PRS-RSRP-MeasFR2 fields. The supportOfDL-PRS-RSRP-MeasFR1 field indicates whether the first UE supports DL-PRS measurements for RSRP in FR1. The supportOfDL-PRS-RSRP-MeasFR2 field indicates whether the first UE supports DL-PRS measurements for RSRP in FR2.

[0415] The IE associated with SL PRS includes the supportOfSL_PRS_RSRP_MeasFR1 field, the supportOfSL_PRS_RSRP_MeasFR2 field, the supportOfSL_PRS_TxFR1 field, and the supportOfSL_PRS_TxFR2 field.

[0416] The supportOfSL_PRS_RSRP_MeasFR1 field indicates whether the first UE supports SL-PRS measurements for RSRP in FR1.

[0417] The supportOfSL_PRS_RSRP_MeasFR2 field indicates whether the first UE supports SL-PRS measurements for RSRP in FR2.

[0418] The supportOfSL_PRS_TxFR1 field indicates whether the first UE supports SL-PRS transmission in FR1.

[0419] The supportOfSL_PRS_TxFR2 field indicates whether the first UE supports SL-PRS transmission in FR2.

[0420] The first UE receives a first SPP message from the second UE. The first SPP message includes the second UE's Pos_5G-S-TMSI.

[0421] Pos_5G-S-TMSI is a temporary UE ID provided by LMF.

[0422] RequestAssistanceData includes the Layer2-ID of the first terminal and one or more Pos_5G-S-TMSIs. Each of the one or more Pos_5G-S-TMSIs indicates a candidate type2 terminal.

[0423] The first UE receives ProvideAssistanceData from the LMF. ProvideAssistanceData includes Pos_5G-S-TMSI. Pos_5G-S-TMSI corresponds to the second UE.

[0424] The first UE transmits RequestAssistanceData to the LMF. RequestAssistanceData includes an nr-AdType field. The nr-AdType field includes a bitmap. Specific bits of the bitmap represent dl-prs, and other specific bits of the bitmap represent sl-prs.

[0425] The first UE receives ProvideAssistanceData from the LMF. ProvideAssistanceData includes Pos_5G-S-TMSI. Pos_5G-S-TMSI corresponds to a type 2 UE for sidelink positioning and SL-PRS.

[0426] The second UE receives a second SPP message from the LMF. The second SPP message contains Pos_5G_S-TMSI. Pos_5G-S-TMSI corresponds to the first UE for sidelink positioning and SL-PRS. The second SPP message contains a Layer-2 ID. The Layer-2 ID corresponds to the second UE for sidelink positioning and SL-PRS.

[0427] The second UE receives a second SPP message from the LMF. The second SPP message includes preferred_SL_PRS IE. preferred_SL_PRS includes Resource_Pool_index_SL_PRS.

[0428] The first UE sends a UEAssistanceInformationSidelink message to the second UE. The UEAssistanceInformationSidelink message includes preferred_SL_PRS IE. preferred_SL_PRS includes Time_To_Complete, Duration_SL_PRS, Periodicity_SL_PRS, and Bandwidth_SL_PRS.

[0429] The first UE receives RequestLocationInformation from the LMF. RequestLocationInformation includes the pos_5G-S-TMSI and NR_SL_AssistanceAvailability fields of the second terminal.

[0430] The first UE transmits UEAssistanceInformationSidelink to the second UE. UEAssistanceInformationSidelink includes the first UE's preferred_SL-PRS and Pos_5G-S-TMSI.

[0431] The second UE sends SidelinkUEInformationNR to the GNB. SidelinkUEInformationNR includes the ue_Type2 field and the sl_Pos_Tx_Interested field.

[0432] The second UE receives an RRCReconfiguration from the GNB. The RRCReconfiguration includes one or more NR-SL_PRS_ResourceSet IEs and Sl_Pos_ResourcePool IEs.

[0433] The second UE sends an RRCReconfigurationSidelink to the first UE. The RRCReconfigurationSidelink includes one or more NR-SL_PRS_ResourceSet IEs and Sl_Pos_ResourcePool IEs.

[0434] The second UE transmits a sidelink RRC message (or sidelink MAC CE) to the first UE on a resource of the first resource pool.

[0435] The second UE transmits a first sidelink signal to the first UE on a resource of the second resource pool.

[0436] The second UE transmits a second sidelink signal to the first UE on a resource of the third resource pool.

[0437] The first sidelink signal is the synchronization signal, and the second sidelink signal is the PRS.

[0438] The first resource pool is configured by the first SL-ResourcePool IE of SIB12. The second resource pool is configured by the second SL-ResourcePool IE of SIB12. The third resource pool is configured by the SL_Pos_ResourcePool IE of RRCReconfigurationSidelink.

[0439] SL-ResourcePool IE includes the sl-SubchannelSize field.

[0440] The particle size of the frequency resources in the first resource pool is determined by sl-SubchannelSize, and the particle size of the frequency resources in the third resource pool is fixed at 4 PRB.

[0441] The first UE transmits the first SL MAC CE to the second UE. The first MAC CE includes an A / D field, an NR-SL_PRS_ResourceSet ID field, and an Activation_Time field.

[0442] The first UE receives a second SL MAC CE from the second UE. The second MAC CE includes an A / D field, an NR-SL_PRS_ResourceSet ID field, and an Activation_Time field.

[0443] The first UE starts SL-PRS measurement based on the NR-SL_PRS_ResourceSet ID field from a point in time determined based on the Activation_Time field.

[0444] The first UE transmits the third SPP message to the LMF. The third SPP message includes the IE_related_to_high_layer_anchor_UE_ID field, the nr_pos_TimeStamp field, and the nr-SL_PRS-RSRP-Result field.

[0445] The second UE receives a fourth SPP message from the first UE. The fourth SPP message includes the nr_pos_TimeStamp field and the nr-SL_PRS-RSRP-Result field.

[0446] The second UE transmits the third SPP message to the GNB. The third SPP message includes the nr_pos_TimeStamp field, the nr-SL_PRS-RSRP-Result field, the IE_related_to_high_layer_target_UE_ID field, and the nr_SL_PRS_BeamInfo_List field.

[0447] The second UE determines the second slot based on S1_Pos_LengthSymbols and Sl_Pos_StartSymbol directed to SL_Pos_ResourcePool, and TDD-UL-DL-ConfigCommon IE and S-SS / PSBCH blocks directed to SIB1.

[0448] The second UE determines the third slot from the second slot based on sl_Pos_TimeResource.

[0449] The second UE determines the fourth slot based on the SL_PRS_Periodicity-and-ResourceSetSlotOffset indicated in SL_Pos_ResourcePool IE.

[0450] The second UE determines the third symbol based on SL_PRS_NumSymbols and SL_PRS_ResourceSymbolOffset in NR-SL_PRS_ResourceSet IE.

[0451] The second UE transmits SL-PRS at the third symbol of the fourth slot.

[0452] TDD-UL-DL-ConfigCommon IE is included in SIB1, SL_Pos_ResourcePool IE is included in SIB12, and NR-SL_PRS_ResourceSet IE is included in RRCReconfigurationSidelink.

[0453] The first UE determines the second slot based on S1_Pos_LengthSymbols and Sl_Pos_StartSymbol directed to SL_Pos_ResourcePool, and TDD-UL-DL-ConfigCommon IE and S-SS / PSBCH blocks directed to SIB1.

[0454] The second slot is determined based on the presence of TDD-UL-DL-ConfigCommon IE indicated in SIB1, Sl_Pos_LengthSymbols and Sl_Pos_StartSymbol indicated in SL_Pos_ResourcePool, and the second synchronization signal.

[0455] The third slot is determined from the second slot based on sl_Pos_TimeResource.

[0456] The 4th slot is determined by SL_PRS_Periodicity-and-ResourceSetSlotOffset displayed in SL_Pos_ResourcePool IE.

[0457] The first slot is determined by dl-PRS-Periodicity-and-ResourceSetSlotOffset of nr-DL-PRS-AssistanceData.

[0458] The first symbol is determined based on dl-PRS-ResourceSymbolOffset and dl-PRS-NumSymbols of nr-DL-PRS-AssistanceData.

[0459] The second symbol is determined from the first symbol based on the presence of the first synchronization signal.

[0460] The first UE receives DL-PRS at the second symbol of the first slot.

[0461] TDD-UL-DL-ConfigCommon IE is included in SIB1, SL_Pos_ResourcePool IE is included in SIB12, NR-SL_PRS_ResourceSet IE is included in RRCReconfigurationSidelink, and nr-DL-PRS-AssistanceData is included in ProvideAssistanceData.

[0462] The first UE transmits the measurement results for the PRS to the LMF or the second UE.

[0463] The measurement results for PRS are reported to the LMF via the uplink if PRS is DL-PRS, and the measurement results for PRS are reported to the second UE via the sidelink if PRS is SL-PRS.

[0464] Figure 3a is a diagram illustrating the operation of a terminal.

[0465] In 3a-06, the type1 UE receives SystemInformationBlock12 in the first cell. SystemInformationBlock12 includes SL-ConfigCommonNR and SL_Pos_ConfigCommon. SL_Pos_ConfigCommon includes one or more Sl_Pos_ResourcePool IEs.

[0467] In 3a-11, the type1 UE performs sidelink discovery based on SL-ConfigCommonNR.

[0469] In 3a-16, the type1 UE receives a first SPP message from the type2 UE. The type2 UE is identified during sidelink discovery. The first SPP message contains the Pos_5G-S-TMSI of the type2 UE. Pos_5G-S-TMSI is a temporary terminal identifier provided by the LMF.

[0471] In 3a-21, the type1 UE performs sidelink positioning in the first cell based on Pos_5G-S-TMSI of one or more Sl_Pos_ResourcePool IEs and Sl_Pos_ResourcePool IEs.

[0474] FIG. 4a is a block diagram illustrating the internal structure of a terminal to which the present invention is applied.

[0475] Referring to the drawing above, the terminal includes a control unit (4a-01), a storage unit (4a-02), a transceiver (4a-03), a main processor (4a-04), and an input / output unit (4a-05).

[0476] The control unit (4a-01) controls the overall operations of the UE related to mobile communication. For example, the control unit (4a-01) transmits and receives signals through the transceiver (4a-03). Additionally, the control unit (4a-01) writes and reads data to and from the storage unit (4a-02). To this end, the control unit (4a-01) may include at least one processor. For example, the control unit (4a-01) may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as applications. The control unit (4a-01) controls the storage unit and the transceiver so that the terminal operations of FIGS. 2a, 2b, and 3a are performed. The transceiver is also referred to as a transceiver.

[0477] The storage unit (4a-02) stores data such as basic programs, application programs, and setting information for the operation of the terminal. The storage unit (4a-02) provides the stored data in response to a request from the control unit (4a-01).

[0478] The above transver (4a-03) includes an RF processing unit, a baseband processing unit, and an antenna. The RF processing unit performs functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. That is, the RF processing unit upconverts the baseband signal provided by the baseband processing unit into an RF band signal, transmits it through the antenna, and downconverts the RF band signal received through the antenna into a baseband signal. The RF processing unit may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC (digital to analog converter), an ADC (analog to digital converter), etc. The RF processing unit can perform MIMO and can receive multiple layers when performing MIMO operation. The baseband processing unit performs a conversion function between a baseband signal and a bit sequence according to the physical layer specifications of the system. For example, when transmitting data, the baseband processing unit generates complex symbols by encoding and modulating the transmitted bit sequence. In addition, upon receiving data, the baseband processing unit recovers the received bit sequence through demodulation and decoding of the baseband signal provided by the RF processing unit. The transceiver is also referred to as a transceiver.

[0479] The main processor (4a-04) controls overall operations excluding mobile communication-related operations. The main processor (4a-04) processes user input transmitted by the input / output unit (4a-05), stores necessary data in the storage unit (4a-02), controls the control unit (4a-01) to perform mobile communication-related operations, and transmits output information to the input / output unit (4a-05).

[0480] The above input / output unit (4a-05) is composed of a device that accepts user input, such as a microphone or a screen, and a device that provides information to the user, and performs input and output of user data under the control of the main processor.

[0481] FIG. 4b is a block diagram showing the configuration of a base station according to the present invention.

[0482] As illustrated in the drawing above, the base station is configured to include a control unit (4b-01), a storage unit (4b-02), a transceiver (4b-03), and a backhaul interface unit (4b-04).

[0483] The control unit (4b-01) controls the overall operations of the base station. For example, the control unit (4b-01) transmits and receives signals through the transceiver (4b-03) or through the backhaul interface unit (4b-04). Additionally, the control unit (4b-01) writes and reads data to and from the storage unit (4b-02). To this end, the control unit (4b-01) may include at least one processor. The control unit (4b-01) controls the transceiver, storage unit, and backhaul interface unit so that base station operations illustrated in FIG. 2a, etc. are performed.

[0484] The storage unit (4b-02) stores data such as basic programs, application programs, and configuration information for the operation of the main station. In particular, the storage unit (4b-02) can store information regarding bearers assigned to connected terminals, measurement results reported from connected terminals, etc. Additionally, the storage unit (4b-02) can store information that serves as a criterion for determining whether to provide or disconnect multiple connections to the terminals. Furthermore, the storage unit (4b-02) provides the stored data in response to a request from the control unit (4b-01).

[0485] The transceiver (4b-03) includes an RF processing unit, a baseband processing unit, and an antenna. The RF processing unit performs functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. That is, the RF processing unit upconverts a baseband signal provided by the baseband processing unit into an RF band signal and transmits it through the antenna, and downconverts the RF band signal received through the antenna into a baseband signal. The RF processing unit may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc. The RF processing unit may perform down-MIMO operations by transmitting one or more layers. The baseband processing unit performs a conversion function between a baseband signal and a bit sequence according to physical layer specifications. For example, when transmitting data, the baseband processing unit generates complex symbols by encoding and modulating the transmitted bit sequence. In addition, upon receiving data, the baseband processing unit recovers the received bit sequence through demodulation and decoding of the baseband signal provided by the RF processing unit. The transceiver is also referred to as a transceiver.

[0486] The above backhaul interface unit (4b-04) provides an interface for performing communication with other nodes within the network. That is, the above backhaul communication unit (4b-04) converts a bit sequence transmitted from the main base station to another node, e.g., an auxiliary base station, a core network, etc., into a physical signal, and converts a physical signal received from the other node into a bit sequence.

Claims

Claim 1 A method performed by a target terminal in a wireless communication system, wherein the method comprises: a step in which the terminal receives a specific system information block (SIB) from a base station, wherein the specific SIB comprises one or more sets of resource pool parameters, and each of the one or more sets of resource pool parameters comprises a bitmap associated with a sidelink positioning reference signal (SL-PRS) resource pool during a direct frame number (DFN) period, a parameter representing a sidelink start symbol, and a parameter representing the number of symbols used for the sidelink; and a step in which the terminal transmits a specific uplink message to a base station, wherein the specific uplink message comprises: a parameter associated with a sidelink positioning reception interest; a parameter associated with a sidelink destination identifier; a parameter associated with an SL-PRS delay; and a parameter associated with an SL-PRS bandwidth. A method comprising the step of performing an SL-PRS operation based on one or more SL-PRS resource pools configured by the above-mentioned set of one or more resource pool parameters, wherein the SL-PRS resource pools are configured by determining the remaining slots excluding a slot for a side-link synchronization signal block (S-SSB) among all slots, and a slot in which at least one symbol among the symbols determined by the parameter representing the start symbol and the parameter representing the number of symbols is not set as an uplink (UL), and applying the bitmap to the determined remaining slots. Claim 2 delete Claim 3 A method according to claim 1, wherein the specific SIB comprises a subcarrier spacing parameter representing a specific subcarrier spacing configured by one or more SL-PRS resource pools by the set of resource pool parameters. Claim 4 A terminal in a wireless communication system comprises: a transceiver configured to transmit and receive signals; and a control unit, wherein the control unit receives a specific system information block (SIB) from a base station, the specific SIB comprises one or more resource pool parameter sets, each of the one or more resource pool parameter sets comprises a bitmap associated with a sidelink positioning reference signal (SL-PRS) resource pool during a direct frame number (DFN) period, a parameter representing a sidelink start symbol, and a parameter representing the number of symbols used for the sidelink; transmits a specific uplink message to a base station, the specific uplink message comprising: a parameter associated with a sidelink positioning reception interest; a parameter associated with a sidelink destination identifier; a parameter associated with an SL-PRS delay; and a parameter associated with an SL-PRS bandwidth. A terminal characterized by controlling to perform an SL-PRS operation based on one or more SL-PRS resource pools configured by the above-mentioned set of one or more resource pool parameters, wherein the SL-PRS resource pools determine the remaining slots excluding a slot for a sidelink synchronization signal block (S-SSB) among all slots, and a slot in which at least one symbol among the symbols determined by the parameter representing the start symbol and the parameter representing the number of symbols is not set as an uplink (UL), and applying the bitmap to the determined remaining slots.

Images