JP2023046092A - User equipment and communication method - Google Patents

Abstract

To provide user equipment and a communication method that appropriately perform position estimation using a side-link positioning reference signal.SOLUTION: User equipment (100, 101) includes: a communication unit that transmits a side-link positioning reference signal (SL-PRS) to other user equipment (100, 102) or receives it from the other user equipment (100, 102); and a control unit that performs position estimation of the user equipment (100, 101) based on a measurement result for the positioning reference signal. The communication unit transmits or receives the positioning reference signal, based on a setting related to the positioning reference signal determined by the user equipment (100, 101) or the other user equipment (100, 102).SELECTED DRAWING: Figure 7

Description

The present invention relates to user equipment and communication methods.

In a mobile communication system conforming to the technical specifications of 3GPP (3rd Generation Partnership Project), which is a standardization project for mobile communication systems, sidelink communication (e.g., V2X (Vehicle to everything) sidelink communication) is supported (e.g., Non-Patent Document 1). In recent years, for example, sidelink communication has been used for positioning in order to enable positioning of user equipment outside the coverage of a base station and to enable tracking of relative positions of user equipment with low delay. proposed (for example, Non-Patent Document 2). Specifically, it is assumed that the user equipment performs positioning (position estimation) using sidelink positioning reference signals from other user equipment around the user equipment.

3GPP technical specification: TS38.300 V16.6.0 3GPP contribution: RWS-210073

However, the current 3GPP technical specifications do not define a specific operation for the user equipment to perform position estimation using the sidelink positioning reference signal. Therefore, there is a possibility that the user equipment cannot appropriately perform position estimation using the positioning reference signal for the sidelink.

Accordingly, an object of the present invention is to provide a user apparatus and a communication method that enable appropriate position estimation using positioning reference signals for sidelinks.

The user device according to the first aspect includes a communication unit (110) that transmits or receives a sidelink positioning reference signal to another user device (100, 102) from the other user device (100, 102), A control unit (120) for estimating the position of the user equipment (100, 101) based on the measurement result for the positioning reference signal. The communication unit (110) transmits or receives the positioning reference signal based on the setting regarding the positioning reference signal determined by the user devices (100, 101) or the other user devices (100, 102). conduct.

A user equipment according to the second aspect is a user equipment (100) that transmits a positioning reference signal for sidelink. The user equipment includes a communication unit (110) that receives measurement results for the positioning reference signals from the other user equipment (100, 102), and estimates the position of the user equipment (100) based on the measurement results. and a control unit (120) for performing.

A communication method according to the third aspect is a communication method executed by user devices (100, 101). The communication method includes a step of transmitting a sidelink positioning reference signal to another user device (100, 102) or receiving from the other user device (100, 102), and based on a measurement result for the positioning reference signal estimating the position of said user equipment (100) using said positioning reference based on a configuration for said positioning reference signal determined by said user equipment (100) or said other user equipment (100, 102). and transmitting or receiving a signal.

ADVANTAGE OF THE INVENTION According to one aspect of the present invention, it is possible to provide a user device and a communication method that enable appropriate position estimation using a positioning reference signal for a sidelink.

1 is a diagram showing the configuration of a mobile communication system according to an embodiment; FIG. 1 is a diagram showing a configuration example of a protocol stack in a mobile communication system according to an embodiment; FIG. FIG. 4 is a diagram showing a configuration example of a protocol stack of a UE in the mobile communication system according to the embodiment; It is a figure which shows the structure of UE which concerns on embodiment. It is a figure which shows the structure of the base station which concerns on embodiment. It is a figure which shows the structure of the position management apparatus which concerns on embodiment. FIG. 5 is a sequence diagram for explaining a first operation example according to one embodiment; FIG. 11 is a sequence diagram for explaining a second operation example according to one embodiment; FIG. 12 is a sequence diagram for explaining a third operation example according to one embodiment; FIG. 14 is a sequence diagram for explaining a fourth operation example according to one embodiment; FIG. 16 is a sequence diagram for explaining a fifth operation example according to one embodiment; FIG. 21 is a sequence diagram for explaining a sixth operation example according to one embodiment;

A mobile communication system according to an embodiment will be described with reference to the drawings. In the description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

(Configuration of mobile communication system)
A configuration of a mobile communication system 1 according to an embodiment will be described with reference to FIG. The mobile communication system 1 is, for example, a system conforming to 3GPP Technical Specifications (TS). Hereinafter, as the mobile communication system 1, a mobile communication system based on the 3GPP standard 5th Generation System (5GS), that is, NR (New Radio) will be described as an example.

The mobile communication system 1 has a network 10 and a user equipment (UE) 100 communicating with the network 10 . The network 10 includes an NG-RAN (Next Generation Radio Access Network) 20, which is a 5G radio access network, and a 5GC (5G Core Network) 30, which is a 5G core network.

NG-RAN 20 includes multiple base stations 200 . Each base station 200 manages at least one cell. A cell constitutes the minimum unit of a communication area. For example, one cell belongs to one frequency (carrier frequency) and is configured by one component carrier. The term “cell” may represent a radio communication resource and may also represent a communication target of UE 100 . Each base station 200 can perform radio communication with the UE 100 residing in its own cell. The base station 200 communicates with the UE 100 using the RAN protocol stack. Base station 200 provides NR user plane and control plane protocol termination towards UE 100 and is connected to 5GC 30 via NG interface. Such an NR base station 200 is sometimes referred to as a gNodeB (gNB).

5GC 30 includes a core network device 300 . The core network device 300 includes, for example, AMF (Access and Mobility Management Function) and/or UPF (User Plane Function). AMF performs mobility management of UE100. UPF provides functions specialized for user plane processing. The AMF and UPF are connected with the base station 200 via the NG interface.

5GC 30 includes location management device 400 . The location manager 400 may manage support for location services for the UE (target UE) 100 . The location management device 400 may manage overall coordination and scheduling of resources required for the location of the UE 100 . The location management device 400 is sometimes called an LMF (Location Management Function). The LMF is connected with the AMF via the NL1 interface. The NL1 interface is only used as a transport link for LTE Positioning Protocol (LPP) and NR Positioning Protocol A (NRPPa).

UE 100 is a device used by a user. The UE 100 is, for example, a portable device such as a mobile phone terminal such as a smart phone, a tablet terminal, a notebook PC, a communication module, or a communication card. The UE 100 may be a vehicle (eg, car, train, etc.) or a device provided therein. The UE 100 may be a transport body other than a vehicle (for example, a ship, an airplane, etc.) or a device provided thereon. The UE 100 may be a sensor or a device attached thereto. Note that the UE 100 includes a mobile station, a mobile terminal, a mobile device, a mobile unit, a subscriber station, a subscriber terminal, a subscriber device, a subscriber unit, a wireless station, a wireless terminal, a wireless device, a wireless unit, a remote station, and a remote terminal. , remote device, or remote unit. Also, the UE 100 may be called, for example, a road-side unit (RSU) installed on a road, or a vulnerable road user (VRU).

The UE 100 may perform sidelink communication, which is communication via an interface between the UEs 100 . The interface between UEs 100 may be referred to as the PC5 interface.

Sidelink communications may include NR sidelink communications and V2X sidelink communications. NR sidelink communication is an Autonomous System (AS) feature that enables at least V2X communication between two or more nearby UEs 100 using NR technology without going through network nodes. V2X sidelink communication is an AS feature that enables V2X communication between two or more nearby UEs 100 without going through a network node using E-UTRA (Evolved Universal Terrestrial Radio Access) technology. Support for Vehicle to everything (V2X) services over the PC5 interface can be provided by NR sidelink communication and/or V2X sidelink communication. NR sidelink communication may be used to support services other than V2X services.

Sidelink communication (i.e., sidelink transmission and reception), regardless of which RRC (Radio Resource Control) state the UE 100 is in, the UE 100 is in NG-RAN coverage (e.g., in a cell), and when the UE 100 It may be supported both when outside NG-RAN coverage (eg, outside a cell).

A configuration example of a protocol stack in the mobile communication system 1 according to the embodiment will be described with reference to FIG.

As shown in FIG. 2, the protocol of the radio section between the UE 100 and the base station 200 includes a physical (PHY) layer, a MAC (Medium Access Control) layer, an RLC (Radio Link Control) layer, and a PDCP (Packet Data Convergence Protocol) layer, RRC (Radio Resource Control) layer, and LPP (LTE Positioning Protocol) layer.

The PHY layer performs encoding/decoding, modulation/demodulation, antenna mapping/demapping, and resource mapping/demapping. Data and control information are transmitted between the PHY layer of the UE 100 and the PHY layer of the base station 200 via physical channels.

A physical channel consists of multiple OFDM symbols in the time domain and multiple subcarriers in the frequency domain. One subframe consists of a plurality of OFDM symbols in the time domain. A resource block is a resource allocation unit, and is composed of a plurality of OFDM symbols and a plurality of subcarriers. A frame may consist of 10 ms and may include 10 subframes of 1 ms. A subframe can include a number of slots corresponding to the subcarrier spacing.

Among the physical channels, the physical downlink control channel (PDCCH) plays a central role for purposes such as downlink scheduling assignments, uplink scheduling grants, and transmission power control.

In NR, the UE 100 can use a narrower bandwidth than the system bandwidth (ie, cell bandwidth). The base station 200 configures the UE 100 with a bandwidth part (BWP) made up of consecutive PRBs. UE 100 transmits and receives data and control signals on the active BWP. Up to four BWPs can be set in the UE 100, for example. Each BWP may have different subcarrier spacing and may overlap each other in frequency. If multiple BWPs are configured for the UE 100, the base station 200 can specify which BWP to activate through downlink control. This allows the base station 200 to dynamically adjust the UE bandwidth according to the amount of data traffic of the UE 100, etc., and reduce UE power consumption.

The base station 200 can, for example, configure up to three control resource sets (CORESETs) for each of up to four BWPs on the serving cell. CORESET is a radio resource for control information that the UE 100 should receive. UE 100 may be configured with up to 12 CORESETs on the serving cell. Each CORESET has an index from 0 to 11. For example, a CORESET consists of 6 resource blocks (PRBs) and 1, 2 or 3 consecutive OFDM symbols in the time domain.

The MAC layer performs data priority control, hybrid ARQ (HARQ) retransmission processing, random access procedures, and the like. Data and control information are transmitted between the MAC layer of the UE 100 and the MAC layer of the base station 200 via transport channels. The MAC layer of base station 200 includes a scheduler. The scheduler determines uplink and downlink transport formats (transport block size, modulation and coding scheme (MCS)) and allocation resources to the UE 100 .

The RLC layer uses functions of the MAC layer and the PHY layer to transmit data to the RLC layer of the receiving side. Data and control information are transmitted between the RLC layer of the UE 100 and the RLC layer of the base station 200 via logical channels.

The PDCP layer performs header compression/decompression and encryption/decryption.

An SDAP (Service Data Adaptation Protocol) layer may be provided as an upper layer of the PDCP layer. The SDAP (Service Data Adaptation Protocol) layer performs mapping between an IP flow, which is a unit of QoS control performed by a core network, and a radio bearer, which is a unit of QoS control performed by an AS (Access Stratum).

The RRC layer controls logical, transport and physical channels according to establishment, re-establishment and release of radio bearers. RRC signaling for various settings is transmitted between the RRC layer of UE 100 and the RRC layer of base station 200 . When there is an RRC connection between the RRC of UE 100 and the RRC of base station 200, UE 100 is in the RRC connected state. If there is no RRC connection between the RRC of the UE 100 and the RRC of the base station 200, the UE 100 is in RRC idle state. When the RRC connection between the RRC of UE 100 and the RRC of base station 200 is suspended, UE 100 is in RRC inactive state.

The NAS layer located above the RRC layer performs session management and mobility management for the UE 100 . NAS signaling is transmitted between the NAS layer of the UE 100 and the NAS layer of the core network device 300 (AMF).

The LPP layer, which is located above the RRC layer, is used for exchanging positioning capabilities, transmitting assistance data, transmitting location information, transmitting positioning measurements (measurement results of positioning reference signals), and/or position estimation (position estimation result), error handling, and/or abort. LPP signaling (LPP messages) is transmitted between the LPP layer of the UE 100 and the LPP layer of the location management device 400 (LPP).

Note that the UE 100 has an application layer and the like in addition to the radio interface protocol.

As shown in FIG. 3, the protocol of the radio section between UEs 100 may have a physical layer, a MAC layer, an RLC layer, a PDCP layer, and an RRC layer. The protocol may be the control plane protocol stack for the sidelink control channel (SCCH) of RRC on the PC5 interface. On the other hand, the control plane protocol for the sidelink broadcast channel (SBCCH) may comprise a physical layer, a MAC layer, an RLC layer, an RRC layer, and omit the PDCP layer.

Also, as shown in FIG. 3, the protocol of the radio section between the UEs 100 may have a physical layer, a MAC layer, an RLC layer, a PDCP layer, an RRC layer, and a PC5-S layer. The protocol may be used in the control plane for the sidelink control channel (SCCH) of PC5-S.

The PHY layer has similar functionality as described above. Data and control information are transmitted between the PHY layer of the UE 100 and the PHY layer of the UE 100 via physical channels.

In addition to the same functions as described above, the MAC layer includes radio resource selection, packet filtering, priority processing between uplink and sidelink transmission, sidelink CSI (Channel State Information) as services and functions via the PC5 interface. ) reporting, etc.

The RLC layer has similar functionality as described above. Data and control information are transmitted between the RLC layer of the UE 100 and the RLC layer of the UE 100 via logical channels.

The PDCP layer has similar functionality as described above with some restrictions (eg, restrictions on Out-of-order delivery, duplication, etc.).

The RRC layer transfers PC5-RRC messages between peer UEs, maintains and releases PC5-RRC connections between two UEs, detects sidelink radio link failures for PC5-RRC connections, and so on. Note that a PC5-RRC connection is a logical connection between two UEs for a Source Layer-2 ID and Destination Layer-2 ID pair. The logical connection is considered established after the corresponding PC5 unicast link is established.

The PC5-S layer performs such things as forwarding of PC5-S signaling (eg, PC5-S messages).

Note that the UE 100 may have layers other than the layers described above.

(Assumed scenario)
An assumed scenario in the mobile communication system 1 according to the embodiment will be described. In a mobile communication system 1 conforming to the technical specifications of 3GPP (3rd Generation Partnership Project), which is a standardization project for the mobile communication system 1, positioning using sidelink communication has been proposed. Specifically, it is assumed that the UE 100 performs positioning (position estimation) using sidelink positioning reference signals from other UEs 100 around the UE 100 .

However, the current 3GPP technical specifications do not define a specific operation for the UE 100 to perform position estimation using the sidelink positioning reference signal. Therefore, there is a possibility that the UE 100 cannot appropriately perform position estimation using the sidelink positioning reference signal. In one embodiment described later, an operation for enabling the UE 100 to appropriately perform position estimation using the sidelink positioning reference signal will be described.

(Configuration of user device)
A configuration of the UE 100 according to the embodiment will be described with reference to FIG. UE 100 includes communication unit 110 and control unit 120 .

The communication unit 110 performs wireless communication with the base station 200 by transmitting and receiving wireless signals to and from the base station 200 . The communication unit 110 has at least one transmitter 111 and at least one receiver 112 . The transmitter 111 and receiver 112 may be configured to include multiple antennas and RF circuits. The antenna converts a signal into radio waves and radiates the radio waves into space. Also, the antenna receives radio waves in space and converts the radio waves into signals. The RF circuitry performs analog processing of signals transmitted and received through the antenna. The RF circuitry may include high frequency filters, amplifiers, modulators, low pass filters, and the like.

The control unit 120 performs various controls in the UE 100 . Control unit 120 controls communication with base station 200 via communication unit 110 . The operations of the UE 100 described above and below may be operations under the control of the control unit 120 . The control unit 120 may include at least one processor capable of executing a program and a memory that stores the program. The processor may execute a program to operate the control unit 120 . The control unit 120 may include a digital signal processor that performs digital processing of signals transmitted and received through the antenna and RF circuitry. The digital processing includes processing of the protocol stack of the RAN. Note that the memory stores programs executed by the processor, parameters related to the programs, and data related to the programs. The memory may include at least one of ROM (Read Only Memory), EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), RAM (Random Access Memory) and flash memory. All or part of the memory may be included within the processor.

In the UE 100 configured in this way, the communication unit 110 transmits or receives the sidelink positioning reference signal to or from the other UE 100 . The control unit 120 performs position estimation of the UE 100 based on the measurement result for the positioning reference signal. The communication unit 110 transmits or receives a positioning reference signal based on the positioning reference signal setting determined by the UE 100 or another UE 100 . Thereby, the UE 100 can appropriately transmit or receive the positioning reference signal, and can appropriately perform position estimation using the positioning reference signal.

Further, the communication unit 110 receives from other UEs 100 measurement results for the sidelink positioning reference signals transmitted by the UE 100 . The control unit 120 performs position estimation of the UE 100 based on the measurement results. Thereby, the UE 100 can appropriately perform position estimation using the positioning reference signal.

Further, the communication unit 110 receives control information regarding positioning reference signals from the communication device. The control unit 120 controls transmission or reception of positioning reference signals based on the control information. The control information includes a request to enable or disable the transmission or reception of positioning reference signals, the type of signal to use as positioning reference signals, and whether the UE 100 is the source or destination of the positioning reference signals. and/or information that specifies In addition, the control unit 120 generates control information regarding positioning reference signals for sidelinks. The communication unit 110 transmits control information to other UEs 100 that transmit or receive positioning reference signals. The control information includes a request to enable or disable the transmission or reception of positioning reference signals, the type of signal to use as the positioning reference signal, and whether the other UE 100 is the source or destination of the positioning reference signal. and/or information that specifies whether The communication device is any one of UE 100, base station 200, and location management device 400. FIG.

This allows the control unit 120 to control transmission or reception of positioning reference signals based on a request to enable or disable transmission or reception of positioning reference signals. Also, the control unit 120 can control the transmission or reception of the positioning reference signal based on the type of signal used as the positioning reference signal. The control unit 120 can control transmission or reception of the positioning reference signal based on information specifying whether the UE 100 is the source or destination of the positioning reference signal. As a result, the UE 100 can appropriately perform position estimation using the positioning reference signal.

In the following, the operation of the functional units provided in the UE 100 (specifically, at least one of the communication unit 110 (the transmission unit 111 and/or the reception unit 112) and the control unit 120) will be described as the operation of the UE 100. There is

(Base station configuration)
A configuration of the base station 200 according to the embodiment will be described with reference to FIG. Base station 200 has communication unit 210 , network interface 220 , and control unit 230 .

The communication unit 210 , for example, receives radio signals from the UE 100 and transmits radio signals to the UE 100 . The communication unit 210 has at least one transmitter 211 and at least one receiver 212 . The transmitting section 211 and the receiving section 212 may be configured including an RF circuit. The RF circuitry performs analog processing of signals transmitted and received through the antenna. The RF circuitry may include high frequency filters, amplifiers, modulators, low pass filters, and the like.

Network interface 220 sends and receives signals to and from a network. The network interface 220, for example, receives signals from adjacent base stations connected via an Xn interface, which is an interface between base stations, and transmits signals to adjacent base stations. Also, the network interface 220 receives signals from the core network device 300 connected via the NG interface, for example, and transmits signals to the core network device 300 .

The control unit 230 performs various controls in the base station 200 . The control unit 230 controls communication with the UE 100 via the communication unit 210, for example. The control unit 230 also controls communication with nodes (for example, adjacent base stations, the core network device 300, the location management device 400, etc.) via the network interface 220, for example. The operations of the base station 200 described above and below may be operations under the control of the control unit 230 . The control unit 230 may include at least one processor capable of executing programs and a memory storing the programs. The processor may execute a program to operate the controller 230 . Control unit 230 may include a digital signal processor that performs digital processing of signals transmitted and received through the antenna and RF circuitry. The digital processing includes processing of the protocol stack of the RAN. Note that the memory stores programs executed by the processor, parameters related to the programs, and data related to the programs. All or part of the memory may be included within the processor.

In the base station 200 configured in this way, the control section 230 generates control information related to sidelink positioning reference signals. The communication unit 210 transmits control information to the UE 100 that transmits or receives positioning reference signals. The control information includes a request to enable or disable the transmission or reception of positioning reference signals, the type of signal to use as positioning reference signals, and whether the UE 100 is the source or destination of the positioning reference signals. and/or information that specifies By this means, the UE 100 that has received the control information can control the transmission or reception of the positioning reference signal based on the request for enabling or disabling the transmission or reception of the positioning reference signal. Also, the UE 100 can control transmission or reception of the positioning reference signal based on the type of signal used as the positioning reference signal. The control unit 120 of the UE 100 can control transmission or reception of the positioning reference signal based on information specifying whether the UE 100 is the source or destination of the positioning reference signal. As a result, the UE 100 can appropriately perform position estimation using the positioning reference signal.

In the following, the operation of the functional unit (specifically, at least one of the transmitting unit 211, the receiving unit 212, the network interface 220, and the control unit 230) included in the base station 200 will be described as the operation of the base station 200. Sometimes.

(Configuration of position management device)
The configuration of the location management device 400 according to the embodiment will be described with reference to FIG. Location management device 400 has network interface 420 and control unit 430 .

Network interface 420 sends and receives signals to and from a network. The network interface 420 receives signals from, for example, an AMF connected via an NL1 interface, which is an AMF-location management device interface, and transmits signals to the AMF. The network interface 420 may have a transmitter 421 that transmits signals and a receiver 422 that receives signals.

The control unit 430 performs various controls in the position management device 400 . The control unit 430 controls communication with a node (for example, AMF) via the network interface 420, for example. The operations of the location management device 400 described above and later may be operations controlled by the control unit 430 . The control unit 430 may include at least one processor capable of executing programs and a memory storing the programs. The processor may execute a program to operate the controller 430 . It should be noted that the memory stores programs to be executed by the processor, parameters relating to the programs, and data relating to the programs. All or part of the memory may be included within the processor.

In the position management device 400 configured in this way, the control unit 230 generates control information regarding positioning reference signals for sidelinks. The transmitting unit 421 transmits control information to the UE 100 that transmits or receives positioning reference signals. The control information includes a request to enable or disable the transmission or reception of positioning reference signals, the type of signal to use as positioning reference signals, and whether the UE 100 is the source or destination of the positioning reference signals. and/or information that specifies By this means, the UE 100 that has received the control information can control the transmission or reception of the positioning reference signal based on the request for enabling or disabling the transmission or reception of the positioning reference signal. Also, the UE 100 can control transmission or reception of the positioning reference signal based on the type of signal used as the positioning reference signal. The control unit 120 of the UE 100 can control transmission or reception of the positioning reference signal based on information specifying whether the UE 100 is the source or destination of the positioning reference signal. As a result, the UE 100 can appropriately perform position estimation using the positioning reference signal.

In the following description, the operation of the functional units (specifically, at least one of the network interface 420 (the transmitting unit 421 and the receiving unit 422) and the control unit 430) included in the location management device 400 will be referred to as the operation of the location management device 400. can be described as

(Operation of mobile communication system)
(1) First Operation Example A first operation example of the mobile communication system 1 will be described with reference to FIG. The UE 100 that performs position estimation is hereinafter referred to as a target UE 101 . A target UE 101 may be a UE 100 that performs a position estimation procedure in order to know its own position. The target UE 101 may be outside the cell managed by the base station 200 (ie, outside NG-RAN coverage). In this case, the target UE 101 is in RRC idle state or RRC inactive state. Alternatively, the target UE 101 may be within a cell managed by the base station 200 (ie within NG-RAN coverage). In this case, the target UE 101 is in RRC connected state.

Also, the UE 100 that supports position estimation of the target UE 101 is referred to as an anchor UE 102 . The anchor UE 102 may be a UE 100 that performs a location estimation procedure in order for the target UE 101 to know its own location. In this operational example, the anchor UE 102 may be outside the cell managed by the base station 200 (ie, outside NG-RAN coverage). In this case, the anchor UE 102 is in RRC idle state or RRC inactive state. Alternatively, the anchor UE 102 may be within a cell managed by the base station 200 (ie, within NG-RAN coverage). In this case, the anchor UE 102 is in RRC Connected state.

Multiple UEs 100 around the target UE 101 may become anchor UEs 102 . Since each anchor UE 102 operates in the same manner, one anchor UE 102 will be described as a representative in this operation example. Multiple anchor UEs 102 may perform the following operations.

In step S101, the target UE 101 (the control unit 120) determines settings related to sidelink positioning reference signals (hereinafter referred to as SL-PRS settings). The target UE 101 (control unit 120) may initiate SL-PRS configuration determination, for example, depending on the need to know the location of the target UE 101 itself. The target UE 101 (control unit 120) may initiate determination of SL-PRS settings, for example, based on a user's operation.

Target UE 101 (control unit 120) determines time/frequency resources for transmitting and receiving positioning reference signals for sidelink (hereinafter referred to as SL-PRS (Sidelink Positioning Reference Signal)) as SL-PRS settings. You can The target UE 101 (control unit 120) may, for example, determine time/frequency resources from a resource pool composed of time/frequency resource groups that can be used as resources for SL-PRS. In addition, the time/frequency resource is, for example, at least one of the SL-PRS transmission period, the SL-PRS transmission and/or reception bandwidth, the SL-PRS transmission start time, and the SL-PRS transmission end time. may include

The target UE 101 (control unit 120) may determine the source of the SL-PRS (ie, the transmitting entity that transmits the SL-PRS) as the SL-PRS setting. The target UE 101 (control unit 120) may determine the transmission source of the SL-PRS to be the target UE 101 itself or the anchor UE 102.

Also, the target UE 101 (control unit 120) may determine the SL-PRS transmission destination (that is, the receiving entity that receives the SL-PRS) as the SL-PRS setting. The target UE 101 (control unit 120) may determine the transmission destination of the SL-PRS to the target UE 101 itself or to the anchor UE 102. FIG.

Also, the target UE 101 (control unit 120) may determine the type of signal to use as SL-PRS. The target UE 101 (control unit 120) may determine the type of signal to be used as SL-PRS when the mobile communication system 1 supports multiple signals as signals that can be used as SL-PRS. Signals that can be used as SL-PRS are, for example, channel state information reference signals for sidelinks (SL-CSI-RS), sounding reference signals for sidelinks (SL-SRS), demodulation reference signals for sidelinks ( SL-DMRS) and/or synchronization signals and physical broadcast channel blocks for sidelinks (SL-SSB).

In addition, the target UE 101 (control unit 120) may determine SL-PRS measurement report targets. Target UE 101 (control unit 120), for example, as a measurement report target of SL-PRS, for example, received power of SL-PRS (for example, RSRP (Reference Signal Received Power)), reception time of SL-PRS, etc. At least any You may decide whether

The target UE 101 (control unit 120) may determine the SL-PRS signal sequence as the SL-PRS setting. When the target UE 101 (control unit 120) determines that the SL-PRS transmission source is the anchor UE 102, the target UE 101 (control unit 120) may determine a plurality of signal sequences.

In this operation example, the explanation will proceed assuming that the SL-PRS setting is the setting that the target UE 101 transmits the SL-PRS.

In step S102, the target UE 101 (communication unit 110) transmits SL-PRS configuration information indicating the determined configuration to the anchor UE 102. Anchor UE 102 (communication unit 110 ) receives the SL-PRS configuration information from target UE 101 .

The target UE 101 (control unit 120) may generate control information including SL-PRS configuration information. The target UE 101 (communication unit 110) may transmit the generated control information. The control information is control information related to SL-PRS. Control information for SL-PRS is sidelink control information (SCI) defined in the physical layer, MAC control element (MAC CE), RRC message defined in the RRC layer, PC5-S defined in the PC5-S layer message, and messages defined in other layers.

The SL-PRS configuration information may include, for example, information indicating the determined time/frequency resources. The SL-PRS configuration information may also include information indicating SL-PRS measurement report targets.

The SL-PRS configuration information may also include, for example, the type of signal to use as the SL-PRS. The SL-PRS configuration information may also include designation information that designates whether the anchor UE 102 is the source or destination of the SL-PRS. The designation information may indicate that the anchor UE 102 is the source of the SL-PRS, may indicate that the anchor UE 102 is the destination of the SL-PRS, or indicates that the target UE 101 is the transmission of the SL-PRS. It may indicate that the target UE 101 is the source, or that the target UE 101 is the destination of the SL-PRS.

Anchor UE 102 (control unit 120) may determine whether to transmit or receive SL-PRS based on the designation information. If the designation information indicates that the anchor UE 102 is the SL-PRS transmission source or indicates that the target UE 101 is the SL-PRS transmission destination, the anchor UE 102 (control unit 120) transmits the SL-PRS may be determined to be transmitted. In this case, the anchor UE 102 (controller 120) may perform operations to transmit the SL-PRS. On the other hand, if the designation information indicates that the anchor UE 102 is the SL-PRS transmission destination or indicates that the target UE 101 is the SL-PRS transmission source, the anchor UE 102 (control unit 120) It may be determined to receive the SL-PRS. In this case, the anchor UE 102 (controller 120) may perform operations to receive the SL-PRS.

Anchor UE 102 (control unit 120) may apply the SL-PRS configuration indicated by the SL-PRS configuration information. The SL-PRS configuration information may be mandatory for the anchor UE 102 to apply. Therefore, the target UE 101 (control unit 120) may unilaterally determine the SL-PRS setting.

Alternatively, the anchor UE 102 (control unit 120) may determine whether to approve the SL-PRS configuration information. The anchor UE 102 (control unit 120) may apply the SL-PRS configuration when accepting the SL-PRS configuration information. In this way, the SL-PRS configuration information may cause the anchor UE 102 to decide to apply the configuration indicated by the SL-PRS configuration information. Therefore, the SL-PRS setting may be determined through negotiation by exchanging signals regarding setting between the target UE 101 (control unit 120) and the anchor UE 102 (control unit 120) (see step S103).

The anchor UE 102 (control unit 120) may execute the process of step S103, for example, when applying the SL-PRS setting information, or may execute the process of step S103 when the above determination is made. The process of step S103 may be omitted.

In step S103, the anchor UE 102 (communication unit 110) may transmit a response to step S102 to the target UE 101. The target UE 101 (communication unit 110) may receive the response from the anchor UE 102.

The response may contain information indicating approval or rejection of the SL-PRS configuration information. When approving the SL-PRS setting information, the anchor UE 102 (control unit 120) may include information indicating approval of the SL-PRS setting information in the response. When rejecting the SL-PRS configuration information, the anchor UE 102 (control unit 120) may include information indicating rejection of the SL-PRS configuration information in the response. The target UE 101 (communication unit 110) may receive information indicating approval or rejection of the SL-PRS configuration information from the anchor UE 102 in response to the transmission of the SL-PRS configuration information.

When rejecting at least part of the SL-PRS configuration information, the anchor UE 102 (control unit 120) may include in the response information to be rejected among the information included in the SL-PRS configuration information. Anchor UE 102 (control unit 120) may include in the response information indicating alternative settings for reject settings.

If the response includes information indicating approval of the SL-PRS configuration information, the process of step S104 or step S105 may be performed.

On the other hand, if the response includes information indicating rejection of the SL-PRS configuration information, the target UE 101 (control unit 120) may return to the process of step S101. The target UE 101 (control unit 120) may determine a new SL-PRS configuration. Also, if the response includes information indicating alternative settings for the rejected settings, the target UE 101 (control unit 120) may apply the alternative settings. The target UE 101 (control unit 120) may return to the process of step S101 when rejecting the alternative setting.

In step S104, the target UE 101 (communication unit 110) transmits to the anchor UE 102 an SL-PRS measurement request requesting SL-PRS measurement. Anchor UE 102 (communication unit 110 ) receives the SL-PRS measurement request from target UE 101 .

The target UE 101 (control unit 120) may include the SL-PRS measurement request in the control information regarding SL-PRS. The target UE 101 (communication unit 110) may transmit the control information to the anchor UE 102. The anchor UE 102 (communication unit 110) may receive control information from the target UE 101 including the SL-PRS measurement request.

The target UE 101 (communication unit 110) may send an SL-PRS measurement request to the anchor UE 102 before starting transmission of SL-PRS. Anchor UE 102 (communication unit 110) may initiate an operation to measure SL-PRS in response to receiving the SL-PRS measurement request.

Note that the target UE 101 (communication unit 110) may transmit to the anchor UE 102 a reception activation request for enabling (activating) reception of SL-PRS. The target UE 101 (communication unit 110) may transmit the reception activation request instead of the SL-PRS measurement request, or may transmit it separately from the SL-PRS measurement request.

The target UE 101 (control unit 120) may include the reception activation request in the control information regarding SL-PRS. The target UE 101 (communication unit 110) may transmit the control information to the anchor UE 102. The anchor UE 102 (communication unit 110) may receive control information including a reception activation request from the target UE 101.

Anchor UE 102 (communication unit 110) enables reception of SL-PRS based on reception of the reception activation request. Anchor UE 102 (communication unit 110) may initiate an operation to receive SL-PRS in response to receiving the reception activation request. Anchor UE 102 (communication unit 110) that has enabled reception of SL-PRS may start reception of SL-PRS or start waiting for reception as the operation.

Note that step S104 may be omitted.

In step S105, the target UE 101 (communication unit 110) transmits the SL-PRS to the anchor UE 102. Anchor UE 102 (communication unit 110 ) receives the SL-PRS from target UE 101 .

The target UE 101 (communication unit 110) transmits SL-PRS to the anchor UE 102 based on the SL-PRS settings determined by the target UE 101. For example, the target UE 101 (communication unit 110) may transmit SL-PRS using the determined time/frequency resource. The target UE 101 (communication unit 110) may transmit a signal corresponding to the determined signal type as SL-PRS.

Note that the target UE 101 (communication unit 110) may transmit the SL-PRS singly, or may transmit it periodically or aperiodically.

Anchor UE 102 (communication unit 110 ) receives SL-PRS from target UE 101 based on the SL-PRS configuration determined by target UE 101 . Anchor UE 102 (control unit 120) may control reception of SL-PRS based on control information regarding SL-PRS.

For example, the anchor UE 102 (communication unit 110) may receive the SL-PRS using the determined time/frequency resource. Anchor UE 102 (communication unit 110) may receive a signal corresponding to the determined signal type as SL-PRS.

In step S106, the anchor UE 102 (control unit 120) measures SL-PRS.

For example, the anchor UE 102 (control unit 120) may measure at least one of SL-PRS reception power (eg, RSRP), SL-PRS reception time, and the like. Also, the anchor UE 102 (control unit 120) may perform measurement based on, for example, information indicating SL-PRS measurement report targets.

In step S107, the anchor UE 102 (communication unit 110) transmits a measurement report including the measurement results to the target UE 101. The target UE 101 (communication unit 110) receives the measurement report from the anchor UE 102. Thereby, the target UE 101 (communication unit 110) receives the measurement result for the SL-PRS from the anchor UE 102.

The measurement result is, for example, a measured value of at least one of the SL-PRS reception power (for example, RSRP), the SL-PRS reception time (arrival time), the SL-PRS reception angle (arrival angle), and the like.

The measurement report may contain other information in addition to the measurement results for the SL-PRS. For example, the measurement report may include information indicating the geographic coordinates of the anchor UE 102 (communication unit 110).

In step S108, the target UE 101 (control unit 120) performs position estimation based on the measurement result and/or the information indicating the geographical coordinates. The target UE 101 (control unit 120) may perform position measurement using, for example, a method similar to the UL-TDOA (Uplink time difference of arrival) positioning method. Here, a method similar to the UL-TDOA positioning method may be referred to as the SL-TDOA positioning method. The target UE 101 (control unit 120) may perform position measurement, for example, based on the arrival time difference (difference in reception time) when SL-PRSs arrive at multiple anchor UEs 102. FIG.

Anchor UE 102 (control section 120) may disable reception of SL-PRS according to transmission of the measurement report. Also, the anchor UE 102 (control unit 120) may release the SL-PRS setting in response to transmission of the measurement report.

Also, the target UE 101 and the anchor UE 102 may periodically or aperiodically execute the processes from step S105 to step S108 after the process of step S108 is performed, for example.

Also, the target UE 101 (communication unit 110) may transmit a reception deactivation request for disabling reception of SL-PRS in response to reception of the measurement report. The request may be included in the control information for SL-PRS. Anchor UE 102 (control unit 120) may disable (deactivate) reception of SL-PRS in response to receiving the request. Anchor UE 102 (control unit 120) may release the SL-PRS configuration upon receiving the request.

As described above, the target UE 101 (control unit 120) determines SL-PRS settings. The target UE 101 (communication unit 110) transmits SL-PRS configuration information indicating the determined SL-PRS configuration to the anchor UE 102. This allows the anchor UE 102 to know the determined SL-PRS setting, and the target UE 101 (communication unit 110) to transmit the SL-PRS based on the determined SL-PRS setting. This allows the target UE 101 (control unit 120) to appropriately perform position estimation using SL-PRS.

Also, the target UE 101 (communication unit 110) receives information indicating approval or rejection of the SL-PRS setting information from the anchor UE 102 in response to the transmission of the SL-PRS setting information. This allows the target UE 101 (communication unit 110) to know whether the SL-PRS configuration information has been approved or rejected from the anchor UE 102. Since the target UE 101 can transmit the SL-PRS based on the appropriate SL-PRS settings, the position estimation using the SL-PRS can be performed appropriately.

Also, the target UE 101 (communication unit 110) transmits the SL-PRS to the anchor UE 102 based on the determined SL-PRS setting. The target UE 101 (communication unit 110) receives the measurement result for SL-PRS from the anchor UE 102. The target UE 101 (control unit 120) performs position estimation of the target UE 101 based on the measurement result. This eliminates the need for the target UE 101 to measure the SL-PRS from each of the multiple anchor UEs 102, so the processing load on the target UE 101 can be reduced.

Also, target UE 101 (communication unit 110) transmits a reception activation request for enabling reception of SL-PRS to anchor UE 102 before starting transmission of SL-PRS. As a result, the anchor UE 102 can disable reception of the SL-PRS until the request is received, and the power of the anchor UE 102 can be saved. Also, the anchor UE 102 can avoid failing to receive the SL-PRS.

Also, the anchor UE 102 (communication unit 110) receives control information regarding SL-PRS from the target UE 101. FIG. Anchor UE 102 (communication unit 110) controls reception of SL-PRS based on the control information. The control information may include a request to enable or disable reception of SL-PRS (reception activation request/reception deactivation request). This allows the anchor UE 102 (control unit 120) to enable or disable SL-PRS reception based on the request. Power saving of the anchor UE 102 can be achieved.

Also, the control information may be sidelink control information (SCI) defined in the physical layer. This enables real-time control. Also, the control information may be a MAC CE. As a result, a large amount of information can be transmitted to the anchor UE 102 compared to when the control information is SCI, so advanced control becomes possible. Also, when the control information is MAC CE, dynamic control becomes possible compared to when the control information is an RRC message. Also, the control information may be an RRC message. As a result, a large amount of information can be transmitted to the anchor UE 102 compared to when the control information is MAC CE, so advanced control is possible.

The control information may also include the type of signal to use as the SL-PRS. This allows the anchor UE 102 to receive signals based on that type as SL-PRS and report appropriate measurements to the target UE 101 .

The control information may also include designation information that designates whether the anchor UE 102 is the source or destination of the SL-PRS. Anchor UE 102 (control unit 120) can determine whether to transmit or receive SL-PRS based on the designation information. This ensures proper transmission and reception of SL-PRS. As a result, the target UE 101 (control unit 120) can appropriately perform position estimation using SL-PRS.

(2) Second Operation Example With reference to FIG. 8, a second operation example will be described, mainly focusing on differences from the above-described operation example. In a second operational example, the target UE 101 determines the SL-PRS configuration and the anchor UE 102 transmits the SL-PRS.

As shown in FIG. 8, steps S201 to S203 are similar to steps S101 to S103. In this operational example, the explanation proceeds assuming that the SL-PRS setting is the setting that the anchor UE 102 transmits the SL-PRS.

The target UE 101 (control unit 120) may determine different resources as time/frequency resources for multiple anchor UEs 102 to transmit SL-PRS. In addition, when multiple anchor UEs 102 determine the same resource as time/frequency resources for transmitting SL-PRS, the target UE 101 (control unit 120) may determine multiple signal sequences as SL-PRS signal sequences. .

The target UE 101 (control unit 120) may include a plurality of different time/frequency resources in control information. In addition, when including the same time/frequency resource in the control information, the target UE 101 (control unit 120) may also include information indicating each of a plurality of signal sequences in the control information.

In step S204, the target UE 101 (communication unit 110) transmits to the anchor UE 102 a transmission activation request for enabling transmission of SL-PRS. Anchor UE 102 (communication unit 110 ) receives the transmission activation request from target UE 101 .

The target UE 101 (control unit 120) may include the transmission activation request in the control information regarding SL-PRS. The target UE 101 (communication unit 110) may transmit the control information to the anchor UE 102. The anchor UE 102 (communication unit 110) may receive control information including a transmission activation request from the target UE 101.

The target UE 101 (communication unit 110) may start operation for receiving the SL-PRS in response to transmission of the transmission activation request.

Anchor UE 102 (communication unit 110) enables transmission of SL-PRS based on reception of the transmission activation request. Anchor UE 102 (communication unit 110) may initiate operations to transmit SL-PRS in response to receiving the transmission activation request. Anchor UE 102 (communication unit 110) that has enabled transmission of SL-PRS may start transmission of SL-PRS or start waiting for transmission as the operation.

Note that step S204 may be omitted.

In step S205, the anchor UE 102 (communication unit 110) transmits the SL-PRS to the target UE 101. The target UE 101 (communication unit 110) receives the SL-PRS from the anchor UE 102.

Anchor UE 102 (communication unit 110 ) transmits SL-PRS to target UE 101 based on the SL-PRS configuration determined by target UE 101 . For example, anchor UE 102 (communication unit 110) may transmit SL-PRS using the determined time/frequency resource. Anchor UE 102 (communication unit 110) may transmit a signal corresponding to the determined signal type as SL-PRS.

The target UE 101 (communication unit 110) receives the SL-PRS from the anchor UE 102 based on the SL-PRS configuration determined by the target UE 101. For example, the target UE 101 (communication unit 110) may receive the SL-PRS using the determined time/frequency resource. The target UE 101 (communication unit 110) may receive the signal corresponding to the determined signal type as the SL-PRS.

Note that the anchor UE 102 (communication unit 110) may transmit information indicating the geographical coordinates of the anchor UE 102 to the target UE 101. The target UE 101 (communication unit 110) may receive the SL-PRS from the anchor UE 102.

In step S206, the target UE 101 (control unit 120) performs measurements for SL-PRS.

Target UE 101 (control unit 120), for example, received power of SL-PRS (eg, RSRP), reception time of SL-PRS, angle of arrival of SL-PRS (AoA) and angle of departure of SL-PRS (AoD), etc. may be measured. Also, the target UE 101 (control unit 120) may perform measurement based on, for example, information indicating SL-PRS measurement report targets.

In addition, when the target UE 101 (control unit 120) receives the SL-PRS from each of the plurality of anchor UEs 102, the target UE 101 measures each SL-PRS.

In step S207, the target UE 101 (control unit 120) performs position estimation based on the measurement result. The target UE 101 (control unit 120) may perform position measurement using, for example, a method similar to the DL-AoD (Downlink Angle-of-Departure) positioning method. Here, a method similar to the DL-AoD positioning method may be referred to as the SL-AoD positioning method. The target UE 101 (control unit 120) may perform position measurements based on angles of launch (AoD) of SL-PRS from multiple anchor UEs 102, for example.

In addition, the target UE 101 (control unit 120), the received power of the DL-PRS from a plurality of anchor UE 102 (specifically, RSRP (Reference Signal Received Power)) measurement value, SL-PRS spatial information and multiple , the location of the UE 100 may be estimated based on the knowledge of the geographic coordinates of the transmission/reception points (ie, the plurality of anchor UEs 102) (information indicating the geographic coordinates of the anchor UEs 102).

Note that when the anchor UE 102 periodically or aperiodically transmits SL-PRS, the target UE 101 (control unit 120) may perform position estimation each time SL-PRS is measured.

Also, the target UE 101 (communication unit 110) may transmit a transmission deactivation request for disabling transmission of SL-PRS according to execution of position estimation. The request may be included in the control information for SL-PRS. Anchor UE 102 (control unit 120) may disable (deactivate) transmission of SL-PRS in response to receiving the request. Anchor UE 102 (control unit 120) may release the SL-PRS configuration upon receiving the request.

As described above, the target UE 101 (communication unit 110) receives SL-PRS based on the SL-PRS setting determined by the target UE 101. FIG. The target UE 101 (control unit 120) performs measurements on the SL-PRS received from the anchor UE 102. This allows the anchor UE 102 to know the SL-PRS configuration determined by the target UE 101 and to send the SL-PRS. The target UE 101 (communication unit 110) can receive SL-PRS based on the determined SL-PRS configuration. This allows the target UE 101 (control unit 120) to appropriately perform position estimation using SL-PRS.

Also, the target UE 101 (communication unit 110) transmits a transmission activation request for enabling transmission of SL-PRS to the anchor UE 102. FIG. As a result, the anchor UE 102 can disable transmission of the SL-PRS until the request is received, and the power of the anchor UE 102 can be saved. Also, the target UE 101 can avoid failing to receive the SL-PRS.

Also, the anchor UE 102 (communication unit 110) receives control information regarding SL-PRS from the target UE 101. FIG. Anchor UE 102 (communication unit 110) controls reception of SL-PRS based on the control information. The control information may include a request to enable or disable transmission of SL-PRS (transmission activation request/transmission deactivation request). This allows anchor UE 102 (control unit 120) to enable or disable SL-PRS transmission based on the request. Power saving of the anchor UE 102 can be achieved.

(3) Third Operation Example A third operation example will be described with reference to FIG. 9, mainly focusing on differences from the above-described operation example. In a third operational example, the anchor UE 102 determines the SL-PRS configuration and the target UE 101 transmits the SL-PRS.

As shown in FIG. 9, in step S301, the anchor UE 102 (control unit 120) determines SL-PRS settings. The anchor UE 102 (control unit 120) performs the same operation as the target UE 101 in step S101.

Note that the anchor UE 102 (the communication unit 110) may receive signaling that triggers step S301 from the target UE 101. Anchor UE 102 (control unit 120) may initiate SL-PRS configuration determination in response to receiving the signaling.

For example, the target UE 101 (communication unit 110) may send an anchor UE request to the anchor UE 102 requesting to become an anchor UE. Anchor UE 102 (communication unit 110 ) receives the anchor UE request from target UE 101 . The anchor UE 102 (control unit 120) may perform the process of step S302 upon receiving the anchor UE request. Alternatively, the anchor UE 102 (control unit 120) may determine whether or not to approve becoming an anchor UE. The anchor UE 102 (control unit 120) may perform the process of step S302 when approving to become the anchor UE. When rejecting becoming an anchor UE, the anchor UE 102 (control unit 120) may transmit information indicating rejection of becoming an anchor UE to the target UE 101 .

The target UE 101 (communication unit 110) may transmit information that triggers step S302 to the anchor UE 102 instead of the anchor UE request. Such information may be included in the control information for SL-PRS. Anchor UE 102 (control unit 120) may execute the process of step S302 upon receiving the information.

If the anchor UE 102 is located within the cell, the anchor UE 102 (communication unit 110) may receive signaling from the network 10 that triggers step S301. The triggering signaling may be, for example, signaling such as a request or instruction from the base station 200 or signaling such as a message from the location management device 400 .

In step S302, the anchor UE 102 (communication unit 110) transmits SL-PRS configuration information indicating the determined configuration to the target UE 101. The target UE 101 (communication unit 110) receives the SL-PRS configuration information from the anchor UE 102.

The anchor UE 102 (communication unit 110) performs the same operation as the target UE 101 in step S102. The target UE 101 (communication unit 110) performs the same operation as the anchor UE 102 in step S102. Also, the target UE 101 may perform the same operation as the anchor UE 102 in step S103, and the anchor UE 102 may perform the same operation as the target UE 101 in step S103.

Steps S303 to S307 are the same as steps S104 to S108.

As described above, anchor UE 102 (control unit 120) determines SL-PRS settings. Anchor UE 102 (communication unit 110 ) transmits SL-PRS configuration information indicating the determined SL-PRS configuration to target UE 101 . The target UE 101 (communication unit 110) receives the SL-PRS configuration information determined by the anchor UE 102 from the anchor UE 102. This allows the target UE 101 to know the SL-PRS configuration determined by the anchor UE 102 and transmit SL-PRS based on the determined SL-PRS configuration. This allows the target UE 101 (control unit 120) to appropriately perform position estimation using SL-PRS.

(4) Fourth Operation Example A fourth operation example will be described with reference to FIG. 10, mainly focusing on differences from the above-described operation example. In a fourth operational example, the anchor UE 102 determines the SL-PRS configuration and the anchor UE 102 transmits the SL-PRS.

As shown in FIG. 10, steps S401 and S402 are similar to steps S301 and S302. Steps S403 to S406 are the same as S204 to S207.

Anchor UE 102 (control unit 120) determines the SL-PRS configuration. Anchor UE 102 (communication unit 110 ) transmits SL-PRS configuration information indicating the determined SL-PRS configuration to target UE 101 . The target UE 101 (communication unit 110) receives the SL-PRS configuration information determined by the anchor UE 102 from the anchor UE 102. This allows the target UE 101 to know the SL-PRS configuration determined by the anchor UE 102 and receive the SL-PRS based on the determined SL-PRS configuration. This allows the target UE 101 (control unit 120) to appropriately perform position estimation using SL-PRS.

(5) Fifth operation example
With reference to FIG. 11, the fifth operation example will be described mainly with respect to the differences from the above-described operation example. In the fifth operation example, the target UE 101 performs position estimation based on the position information from the position management device 400 .

In this operational example, the target UE 101 and the anchor UE 102 are within the cell managed by the base station 200 (ie within the NG-RAN coverage). The target UE 101 and the anchor UE 102 are in RRC connected state. Alternatively, the target UE 101 and the anchor UE 102 may be in RRC idle state or RRC inactive state. The target UE 101 and the anchor UE 102 may transition to the RRC connected state when communicating with the location management device 400 .

As shown in FIG. 11, in step S501, the target UE 101 (communication unit 110) transmits a location service request to the location management device 400. FIG. The location management device 400 receives a location service request from the target UE 101 .

A location service request may request information that is used to determine SL-PRS settings. A request for location services may be included, for example, in any of MO-LR request messages, UL NAS transport messages, LPP messages, and the like. The location service request (including a message) includes, for example, location estimation accuracy, SL-PRS measurement accuracy, information indicating the quality of service (QoS) of the location service (LCS), and/or the like. can be

UE 100 and location management device 400 communicate (transmit and/or receive) via base station 200 (cell) and AMF. (cell) and AMF may be omitted.

In step S<b>502 , the location management device 400 transmits location assistance information (eg, AssistanceData) to the target UE 101 . The target UE 101 (communication unit 110 ) receives location assistance information from the location management device 400 .

Location assistance information may be included, for example, in any of MO-LR response messages, DL NAS transport messages, LPP messages, and the like. Location assistance information may include information used to determine SL-PRS settings. The location assistance information may include, for example, information indicating resource pools composed of time-frequency resource groups that can be used as resources for SL-PRS. The location assistance information may also include information indicating candidate types of signals to be used as SL-PRS.

The location assistance information may include information of each UE 100 existing around the target UE 101 . Location assistance information may include anchor UE 102 information. The location assistance information may include, for example, the identifier of the anchor UE 102, the location information of the anchor UE 102, and the like.

Note that the location management device 400 may transmit the location assistance information to each UE 100 (anchor UE 102 ) existing around the target UE 101 . The location assistance information may include, for example, the identifier of the target UE 101 and the location information of the target UE 101 .

In step S503, a position estimation procedure is performed. The position estimation procedure may include any of the steps described in the above first to fourth operation examples.

In step S503, the target UE 101 may execute the process of step S506 without performing position estimation. Also, the anchor UE 102 may perform the process of step S504 without sending the measurement report to the target UE 101 .

Also, in step S503, when the anchor UE 102 determines the SL-PRS setting, the location management device 400 may transmit the anchor UE request instead of the target UE 101. Anchor UE 102 may initiate SL-PRS configuration determination in response to receiving an anchor UE request from location management device 400 .

In step S<b>504 , anchor UE 102 (communication section 110 ) transmits a measurement report on SL-PRS to location management device 400 . Location management device 400 receives measurement reports from anchor UE 102 . Note that the measurement report for SL-PRS is the same as the operation example described above.

Anchor UE 102 (communication unit 110 ) may include the measurement report in either a UL NAS transport message, an LPP message, or the like and transmit it to location management device 400 .

Anchor UE 102 (communication unit 110) sends a measurement report on SL-PRS to base station 200 using a measurement report, a UE auxiliary information message, etc. used for reporting communication quality from adjacent base stations adjacent to base station 200. may be sent to The base station 200 may transmit the SL-PRS measurement report to the location management device 400 via AMF.

Note that the target UE 101 (communication unit 110 ) may transmit the measurement report to the location management device 400 . For example, when SL-PRS measurements are performed in the target UE 101 , a measurement report may be sent from the target UE 101 to the location management device 400 . Location management device 400 receives measurement reports from anchor UE 102 .

In step S505, the location management device 400 performs location estimation based on the measurement report. The position management device 400 can perform position estimation in the same manner as in the operation example described above.

In step S<b>506 , the target UE 101 (communication unit 110 ) may transmit a location service request to the location management device 400 . The location management device 400 transmits a request for location information of the target UE 101 to the location management device 400 . The location management device 400 may receive a request for location information from the target UE 101 .

A request for location information may be included, for example, in any of MO-LR request messages, UL NAS transport messages, LPP messages, and the like. The (message containing) location information request includes, for example, location estimation accuracy, SL-PRS measurement accuracy, information indicating the quality of service (QoS) of location service (LCS), and/or the like. can be

In step S507, the location management device 400 transmits the location information to the target UE101. Target UE 101 (communication unit 110 ) receives location information from location management device 400 .

The location information indicates the location of target UE 101 estimated by location management device 400 . Location information may be included, for example, in any of MO-LR response messages, UL NAS transport messages, LPP messages, and the like.

(6) Sixth operation example
With reference to FIG. 12, the sixth operation example will be described mainly with respect to the differences from the above-described operation example. In the sixth operation example, the base station 200 transmits control information regarding SL-PRS. The RRC states of the target UE 101 and the anchor UE 102 are the same as in the fifth operation example.

In step S601, the target UE 101 (communication unit 110) transmits to the base station 200 a request for control information regarding SL-PRS. The base station 200 (communication unit 210 ) receives the request for control information from the target UE 101 .

In step S602, the base station 200 (communication unit 210) transmits control information regarding SL-PRS to the target UE101. The target UE 101 (communication unit 110 ) receives control information from the base station 200 .

The base station 200 (communication unit 210) may generate control information in response to receiving a request for control information. The control information may be downlink control information (DCI) defined in the physical layer, MAC CE, or RRC message.

At step S603, a position estimation procedure is performed. The position estimation procedure may be any one of the first to fourth operation examples described above.

As described above, the target UE 101 (communication unit 110) receives control information regarding SL-PRS from the base station 200. FIG. This allows the base station 200 to control the position estimation procedure.

(Other embodiments)
As shown in the operation example 5 of the above-described embodiment, the location management device 400 may perform location estimation based on the SL-PRS measurement results. In this case, the target UE 101 may perform position estimation based on the SL-PRS measurement results, or may not perform position estimation based on the SL-PRS measurement results. When the target UE 101 does not perform position estimation, the target UE 101 may receive the position information of the target UE 101 from the position management device 400 that has performed the position estimation.

The operation sequences (and operation flows) in the above-described embodiments do not necessarily have to be executed in chronological order according to the order described in the flow diagrams or sequence diagrams. For example, the steps in the operations may be performed out of order or in parallel with the order illustrated in the flow diagrams or sequence diagrams. Also, some steps in the operation may be omitted and additional steps may be added to the process. Further, the operation sequences (and operation flows) in the above-described embodiments may be implemented independently, or two or more operation sequences (and operation flows) may be combined and implemented. For example, some steps of one operation flow may be added to another operation flow, or some steps of one operation flow may be replaced with some steps of another operation flow.

In the above-described embodiment, the mobile communication system 1 based on NR has been described as an example. However, the mobile communication system 1 is not limited to this example. The mobile communication system 1 may be a TS-compliant system of either LTE or another generation system (eg, 6th generation) of the 3GPP standard. Base station 200 may be an eNB that provides E-UTRA user plane and control plane protocol termination towards UE 100 in LTE. The mobile communication system 1 may be a system conforming to a TS of a standard other than the 3GPP standard. The base station 200 may be an IAB (Integrated Access and Backhaul) donor or an IAB node.

A program that causes a computer to execute each process performed by the UE 100 or the base station 200 may be provided. The program may be recorded on a computer readable medium.
A computer readable medium allows the installation of the program on the computer. Here, the computer-readable medium on which the program is recorded may be a non-transitory recording medium. The non-transitory recording medium is not particularly limited, but may be, for example, a recording medium such as CD-ROM or DVD-ROM. Alternatively, circuits for executing each process performed by the UE 100 or the base station 200 may be integrated, and at least part of the UE 100 or the base station 200 may be configured as a semiconductor integrated circuit (chipset, SoC).

In the above embodiments, "transmit" may mean performing at least one layer of processing in the protocol stack used for transmission, or physically transmitting the signal wirelessly or by wire. may mean sending to Alternatively, "transmitting" may mean a combination of performing the at least one layer of processing and physically transmitting the signal wirelessly or by wire. Similarly, "receive" may mean performing processing of at least one layer in the protocol stack used for reception, or physically receiving a signal wirelessly or by wire. may mean that Alternatively, "receiving" may mean a combination of performing the at least one layer of processing and physically receiving the signal wirelessly or by wire. Similarly, "obtain/acquire" may mean obtaining information among stored information, and may mean obtaining information among information received from other nodes. Alternatively, it may mean obtaining the information by generating the information. Similarly, "include" and "comprise" are not meant to include only the recited items, and may include only the recited items or in addition to the recited items. Means that it may contain further items. Similarly, in the present disclosure, "or" does not mean exclusive OR, but means logical OR.

Although the embodiments have been described in detail with reference to the drawings, the specific configuration is not limited to the above, and various design changes can be made without departing from the spirit of the invention.

1: mobile communication system 10: network 100: user equipment (UE)
101: Target UE
102: Anchor UE
110: communication unit 111: transmission unit 112: reception unit 120: control unit 200: base station 210: communication unit 211: transmission unit 212: reception unit 220: network interface 230: control unit 300: core network device 400: location management device 420: network interface 421: transmitter 422: receiver 430: controller

Claims (11)

A user device (100, 101),
A communication unit (110) that transmits or receives sidelink positioning reference signals to other user devices (100, 102) from the other user devices (100, 102);
a control unit (120) for estimating the position of the user equipment (100, 101) based on the measurement result for the positioning reference signal;
The communication unit (110) transmits or receives the positioning reference signal based on the setting regarding the positioning reference signal determined by the user devices (100, 101) or the other user devices (100, 102). User equipment (100, 101). The control unit (120) determines the settings,
The user device (100, 101) according to claim 1, wherein the communication unit (110) transmits setting information indicating the determined setting to the other user device (100, 102). The user device according to claim 2, wherein the communication unit (110) receives information indicating approval or rejection of the setting information from the other user devices (100, 102) in response to transmission of the setting information. 100, 101). The user device (100, 102) according to claim 1, wherein the communication unit (110) receives setting information indicating settings determined by the other user device (100, 102) from the other user device (100, 102). 100, 101). The user device according to claim 4, wherein the communication unit (110) transmits information indicating approval or rejection of the setting information to the other user devices (100, 102) in response to receiving the setting information. 100, 101). The communication unit (110)
transmitting the positioning reference signal to the other user equipment (100, 102) based on the determined configuration;
6. A user equipment (100, 101) according to any one of claims 1 to 5, wherein said measurement results for said positioning reference signal are received from said other user equipment (100, 102). 6. The communication unit (110) transmits a request to enable reception of the positioning reference signal to the other user equipment (100, 102) before starting transmission of the positioning reference signal. A user equipment (100, 101) according to claim 1. The communication unit (110) receives the positioning reference signal from the other user equipment (100, 102) based on the determined setting,
The user equipment (100, 101) according to any one of claims 1 to 5, wherein said control unit (120) performs measurements on said positioning reference signals received from said other user equipment (100, 102). The communication unit (110)
sending a request to the other user equipment (100, 102) to enable transmission of the positioning reference signal;
9. A user equipment (100, 101) according to claim 8, wherein in response to sending said request, it initiates an operation for receiving said positioning reference signal. A user device (100) that transmits a positioning reference signal for sidelink,
a communication unit (110) that receives measurement results for the positioning reference signals from the other user devices (100, 102);
A user device (100, 101) comprising a control unit (120) that estimates the position of the user device (100) based on the measurement result. A communication method performed in a user device (100, 101), comprising:
transmitting to or receiving from another user equipment (100, 102) a positioning reference signal for the sidelink;
estimating the position of the user equipment (100) based on the measurement results for the positioning reference signal;
transmitting or receiving said positioning reference signal based on a configuration for said positioning reference signal determined by said user equipment (100) or said other user equipment (100, 102).

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