Method for positioning by utilizing one-to-one transmission among UEs (user equipment) in next-generation mobile communication

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. According to the present disclosure, a terminal may send a discovery message for sidelink positioning, the discovery message including a Proximity Services (ProSe) application code indicating the sidelink positioning, establish a link for sidelink positioning with a second terminal, and send a discovery message for sidelink positioning to the second terminal. And transmitting sidelink positioning assistance data including sidelink positioning reference signal (PRS) configuration information to the second terminal, transmitting at least one PRS to the second terminal based on the PRS configuration information, and receiving a measurement result for the at least one PRS from the second terminal.

Description

Technical Field

[0001] The present disclosure relates to operations of a terminal in a mobile communication system. In particular, the present disclosure relates to a technology for obtaining a location of a specific UE by utilizing communication between UEs. Background Art

[0002] 5G mobile communication technology defines a wide frequency band, making high transmission rates and new services possible, and can be implemented not only in "below 6 GHz" frequency bands such as 3.5 GHz, but also in "above 6 GHz" frequency bands called millimeter waves including 28 GHz and 39 GHz. In addition, it has been considered to implement 6G mobile communication technology (called super 5G system) in terahertz frequency bands (e.g., 95 GHz to 3 THz frequency bands) in order to achieve a transmission rate fifty times faster than 5G mobile communication technology and an ultra-low latency one-tenth of 5G mobile communication technology.

[0003] At the beginning of the development of 5G mobile communication technology, in order to support services and meet performance requirements related to enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC) and massive machine type communication (mMTC), standardization has been underway on the following items: beamforming and massive MIMO for mitigating millimeter wave path loss and increasing millimeter wave transmission distance; parameter sets supporting efficient utilization of millimeter wave resources and dynamic operation of time slot formats (e.g., operating multiple subcarrier spacings); initial access technology for supporting multi-beam transmission and broadband; definition and operation of BWP (bandwidth part); new channel coding methods such as LDPC (low-density parity check) codes for large-scale data transmission and polarization codes for highly reliable transmission of control information; L2 preprocessing; and network slicing for providing dedicated networks dedicated to specific services.

[0004] Currently, discussions are underway on improvements and performance enhancements of initial 5G mobile communication technologies in consideration of the services they are to support, and there has been physical layer standardization on items such as: technologies for assisting driving determination of autonomous vehicles based on information sent by the vehicle about the location and status of the vehicle and for enhancing user convenience using V2X (Vehicle to Everything); NR-U (Unlicensed New Radio) for system operations that are intended to comply with various regulatory requirements in unlicensed bands; NR UE power saving; non-terrestrial network (NTN) as UE-satellite direct communication for providing coverage in areas where communication with terrestrial networks is unavailable; and positioning.

[0005] In addition, standardization is also being conducted on air interface architecture / protocols for technologies such as the Industrial Internet of Things (IIoT) for supporting new services by interworking and converging with other industries; IAB (Integrated Access and Backhaul) for providing nodes for network service area expansion by supporting wireless backhaul links and access links in an integrated manner; mobility enhancements including conditional handover and DAPS (Dual Active Protocol Stack) handover; and two-step random access for simplifying the random access procedure (2-step RACH for NR). Standardization is also being conducted on system architecture / services for the following items: 5G baseline architecture (e.g., service-based architecture or service-based interface) for combining network function virtualization (NFV) and software defined network (SDN) technologies; and mobile edge computing (MEC) for receiving services based on UE location.

[0006] As 5G mobile communication systems are commercialized, the number of connected devices, which has been increasing exponentially, will be connected to the communication network, and therefore, it is expected that enhanced functions and performance of the 5G mobile communication systems and integrated operations of the connected devices will be necessary. To this end, new research is planned in the following areas: extended reality (XR) for efficiently supporting augmented reality (AR), virtual reality (VR), mixed reality (MR), etc.; 5G performance improvement and complexity reduction by utilizing artificial intelligence (AI) and machine learning (ML); AI service support; metaverse service support; and drone communication.

[0007] In addition, this development of 5G mobile communication systems will serve as the basis for developing not only new waveforms for providing coverage in the terahertz band of 6G mobile communication technology, multi-antenna transmission technologies such as full-dimensional MIMO (FD-MIMO), array antennas and massive antennas, metamaterial-based lenses and antennas for improving the coverage of terahertz band signals, and high-dimensional spatial multiplexing technology using OAM (orbital angular momentum) and RIS (reconfigurable smart surface), but also full-duplex technology for improving the frequency efficiency of 6G mobile communication technology and improving system networks, AI-based communication technology for achieving system optimization from the design stage by utilizing satellites and AI (artificial intelligence) and internalizing end-to-end AI support functions, and next-generation distributed computing technology for implementing services at a complexity level that exceeds the limits of UE operating capabilities by utilizing ultra-high performance communication and computing resources.

[0008] With the development of wireless communication systems as described above, various services can be provided, and thus a scheme for efficiently providing these services is required.

[0009] The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with respect to the present disclosure. Summary of the invention

[0010] Technical issues

[0011] The present disclosure relates to a transmission method and process required for positioning using device-to-device communication, and provides a method for sending messages required for each process and specific contents of the messages.

[0012] Solution to the problem

[0013] In an embodiment, the present disclosure relates to a method performed by a first terminal in a sidelink communication system, the method comprising: sending a discovery message for sidelink positioning, the discovery message comprising a proximity service (ProSe) application code indicating sidelink positioning; establishing a link for sidelink positioning with a second terminal; sending sidelink positioning assistance data including sidelink positioning reference signal (PRS) configuration information to the second terminal; sending at least one PRS to the second terminal based on the PRS configuration information; and receiving measurement results for at least one PRS from the second terminal.

[0014] In an embodiment, the present disclosure relates to a method performed by a second terminal in a sidelink communication system, the method comprising: receiving a discovery message for sidelink positioning, the discovery message comprising a proximity service (ProSe) application code indicating sidelink positioning; establishing a link for sidelink positioning with a first terminal; receiving sidelink positioning assistance data including sidelink positioning reference signal (PRS) configuration information from the first terminal; receiving at least one PRS from the first terminal based on the PRS configuration information; measuring at least one PRS; and sending measurement results for at least one PRS to the first terminal.

[0015] In an embodiment, the present disclosure relates to a first terminal in a sidelink communication system, the first terminal including a transceiver and at least one processor, the at least one processor being configured to: send a discovery message for sidelink positioning via the transceiver, the discovery message including a proximity service (ProSe) application code indicating the sidelink positioning; establish a link for sidelink positioning with a second terminal; send sidelink positioning assistance data including sidelink positioning reference signal (PRS) configuration information to the second terminal via the transceiver; based on the PRS configuration information, send at least one PRS to the second terminal via the transceiver; and receive measurement results for at least one PRS from the second terminal via the transceiver.

[0016] In an embodiment, the present disclosure relates to a second terminal in a sidelink communication system, the second terminal including a transceiver and at least one processor, the at least one processor being configured to: receive a discovery message for sidelink positioning, the discovery message including a proximity service (ProSe) application code indicating sidelink positioning; establish a link for sidelink positioning with a first terminal; receive sidelink positioning assistance data including sidelink positioning reference signal (PRS) configuration information from the first terminal via the transceiver; based on the PRS configuration information, receive at least one PRS from the first terminal via the transceiver; measure at least one PRS; and send measurement results for at least one PRS to the first terminal via the transceiver.

[0017] Advantageous Effects of the Invention

[0018] According to an embodiment of the present disclosure, a terminal may obtain a relative or absolute position through another UE.

[0019] Prior to proceeding with the following description, it may be helpful to set forth definitions of certain words and phrases used throughout this patent document: the terms "include" and "comprising" and their derivatives mean including but not limited to; the term "or" is inclusive, meaning and / or; the phrases "associated with" and "associated with" and their derivatives may mean including, included therein, interconnected with, containing, contained therein, connected to or connected with, coupled to or coupled with, communicable with, cooperating with, interlaced, juxtaposed, proximate, bound to or bound with, having, having the property of, etc.; and the term "controller" means any device, system, or part thereof that controls at least one operation, such a device may be implemented in hardware, firmware, or software, or some combination of at least two of hardware, firmware, or software. It should be noted that the functionality associated with any particular controller may be centralized or distributed, whether locally or remotely.

[0020] In addition, the various functions described below can be implemented or supported by one or more computer programs, each of which is formed by a computer-readable program code and embodied in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, processes, functions, objects, classes, instances, related data or a part thereof adapted to be implemented with a suitable computer-readable program code. The phrase "computer-readable program code" includes any type of computer code, including source code, object code and executable code. The phrase "computer-readable medium" includes any type of medium that can be accessed by a computer, such as a read-only memory (ROM), a random access memory (RAM), a hard drive, a compact disc (CD), a digital video disc (DVD) or any other type of memory. "Non-transient" computer-readable media does not include wired, wireless, optical or other communication links that transmit transient electrical signals or other signals. Non-transient computer-readable media include media in which data can be permanently stored and media in which data can be stored and subsequently rewritten, such as rewritable optical discs or erasable memory devices.

[0021] Definitions for certain words and phrases are provided throughout this patent document, those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior, as well as future uses of such defined words and phrases. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other aspects, features and advantages of certain embodiments of the present disclosure will be more apparent through the following description in conjunction with the accompanying drawings, in which:

[0023] Figure 1 The structure of a general LTE system is shown.

[0024] Figure 2 The wireless protocol structure of a general LTE system is shown.

[0025] Figure 3 A structure of a next generation mobile communication system according to an embodiment of the present disclosure is shown.

[0026] Figure 4 A wireless protocol structure of a next generation mobile communication system according to an embodiment of the present disclosure is shown.

[0027] Figure 5 A block diagram showing an example internal structure of a UE according to an embodiment of the present disclosure.

[0028] Figure 6 A block diagram showing an example configuration of an NR base station according to an embodiment of the present disclosure is shown.

[0029] Figure 7A case where the PC5-RRC layer according to an embodiment of the present disclosure is used as a protocol architecture is shown.

[0030] Figure 8 A case where the PC5-S layer according to an embodiment of the present disclosure is used as a protocol architecture is shown.

[0031] Fig. 9 A case where a discovery layer according to an embodiment of the present disclosure is used as a protocol architecture is shown.

[0032] Fig.10 A sequence diagram illustrating an example of performing a ranging operation and SL-P between UEs when a ranging request message and a response message are introduced according to an embodiment of the present disclosure.

[0033] Fig.11 A sequence diagram showing an example of exchanging SL-P dedicated messages between UEs without ranging request / response messages after a unicast link is established according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0034] Discussed below Figures 1 to 11 The various embodiments used to describe the principles of the present disclosure in this patent document are only for illustration and should not be interpreted in any way as limiting the scope of the present disclosure. Those skilled in the art will understand that the principles of the present disclosure can be implemented in any appropriately arranged system or device.

[0035] The working principle of the present disclosure is described in detail below in conjunction with the accompanying drawings. In the following description of the present disclosure, a detailed description of known functions or configurations incorporated herein will be omitted when it is determined that the description may make the subject matter of the present disclosure unnecessarily unclear. The terms to be described below are terms defined in consideration of the functions in the present disclosure and may differ depending on the user, the user's intention or customization. Therefore, the definition of terms should be based on the content in the entire specification.

[0036] In the following description, for the convenience of description, terms used to identify access 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 exemplarily used. Therefore, the present disclosure is not limited to the terms used below, and other terms referring to subjects with equivalent technical meanings may be used.

[0037] In the following description, a base station is an entity that allocates resources to a terminal, and may be at least one of a gNode B, an eNode B, a Node B, a base station (BS), a wireless access unit, a base station controller, and a node on a network. The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. In the present invention, "downlink (DL)" refers to a wireless link via which a base station sends a signal to a terminal, and "uplink (UL)" refers to a wireless link via which a terminal sends a signal to a base station. In addition, in the following description, an LTE or LTE-A system may be described by way of example, but the embodiments of the present disclosure may also be applied to other communication systems with similar technical backgrounds or channel types. Examples of such communication systems may include fifth-generation mobile communication technologies (5G, new wireless, and NR) that have developed beyond LTE-A, and in the following description, "5G" may be a concept covering existing LTE, LTE-A, or other similar services. In addition, based on the determination of those skilled in the art, the embodiments of the present disclosure may also be applied to other communication systems with some modifications without significantly departing from the scope of the present disclosure. Herein, it will be understood that each block of the flowchart and combinations of blocks in the flowchart can be implemented by computer program instructions.

[0038] These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device create a device for implementing the functions specified in one or more flowchart boxes. These computer program instructions can also be stored in a computer-usable or computer-readable memory, which can guide the computer or other programmable data processing device to function in a specific manner so that the instructions stored in the computer-usable or computer-readable memory produce a product including an instruction device that implements the functions specified in one or more flowchart boxes. The computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are performed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in the flowchart box.

[0039] In addition, each frame of the flow chart can represent a module, a segment or a part of a code, which includes one or more executable instructions for realizing a specified logical function. It should also be noted that in some alternative embodiments, the function indicated in the frame can occur out of order. For example, depending on the function involved, the two frames shown in succession can actually be executed substantially simultaneously, or the frame can sometimes be executed in reverse order. As used in the embodiments of the present disclosure, "unit" refers to a software element or a hardware element that performs a predetermined function, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC). However, "unit" does not always have a meaning limited to software or hardware. "Unit" can be interpreted as being stored in an addressable storage medium or executing one or more processors. Therefore, "unit" includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays and parameters. The elements and functions provided by "unit" can be combined into a smaller number of elements or "units", or divided into a larger number of elements or "units". Furthermore, the elements and "units" may be implemented to reproduce one or more CPUs within a device or a secure multimedia card. Furthermore, the "units" in the embodiments may include one or more processors.

[0040] In the following description, for ease of description, the present disclosure will be described using terms and names defined in the 5GS and NR standards, which are the latest standards specified by the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) among existing communication standards. However, the present disclosure is not limited to these terms and names, and can be applied to systems conforming to other standards in the same manner. For example, the present disclosure can be applied to 3GPP 5GS / NR (fifth generation mobile communication standard).

[0041] Figure 1 is a diagram showing the structure of a general LTE system.

[0042] Reference Figure 1 The wireless access network of the LTE system may include next generation base stations (evolved node B, hereinafter referred to as ENB, node B or base station) 1-05, 1-10, 1-15, 1-20, mobility management entity (MME) 1-25 and serving gateway (S-GW) 1-30. User terminals (hereinafter referred to as UE or terminal) 1-35 may access external networks through ENB 1-05 to 1-20 and S-GW 1-30.

[0043] exist Figure 1In the LTE system, ENB 1-05 to 1-20 may correspond to a Node B in a UMTS system of the related art. The ENB may be connected to the UE 1-35 via a wireless channel and may perform a more complex role than the Node B of the related art. In the LTE system, since all user traffic including real-time services (e.g., Voice over IP (VoIP)) via the Internet Protocol is served via a shared channel, a device for collecting and scheduling state information (e.g., a buffer state of the UE, an available transmission power state, and a channel state) may be used, and the ENB 1-05 to 1-20 may be used as such a device. One ENB may generally control multiple cells. For example, in order to achieve a transmission rate of 100 Mbps, the LTE system may use orthogonal frequency division multiplexing (OFDM) as a wireless access technology with a bandwidth of 20 MHz. In addition, an adaptive modulation and coding (AMC) method for determining a modulation scheme and a channel coding rate may be applied according to the channel state of the UE. The S-GW 1-30 is a device for providing a data bearer, and may generate or remove a data bearer under the control of the MME 1-25. The MME is a device responsible not only for a function of managing UE mobility but also for various control functions, and can be connected to a plurality of ENBs.

[0044] Figure 2 The wireless protocol structure of a general LTE system is shown.

[0045] Reference Figure 2 , UE and ENB may respectively include packet data convergence protocol (PDCP) 2-05, 2-40, radio link control (RLC) 2-10, 2-35 and medium access control (MAC) 2-15, 2-30 in the radio protocol of the LTE system. PDCP may be responsible for the operation of compressing / reconstructing the IP header. The main functions of PDCP are described below.

[0046] -Header compression and decompression function (Header Compression and Decompression: Robust Header Compression (ROHC))

[0047] -User data transmission function (transmission of user data)

[0048] - In-sequence delivery function (in-sequence delivery of upper layer packet data units (PDUs) during PDCP re-establishment for RLC Acknowledged Mode (AM))

[0049] - Sequence re-arrangement functionality (for split bearers in DC (support for RLC AM): PDCP PDU routing for transmission and PDCP PDU re-ordering for reception)

[0050] - Duplicate detection function (duplicate detection of lower layer service data units (SDUs) during RLC AM re-establishment of PDCP)

[0051] - Retransmission functionality (retransmission of PDCP SDUs at handover for split bearers in DC and retransmission of PDCP PDUs during PDCP data recovery for RLC AM)

[0052] -Encryption and decryption functions (encryption and decryption)

[0053] - Timer-based SDU removal functionality (timer-based SDU discard in uplink)

[0054] The Radio Link Control (RLC) unit 2-10, 2-35 may reconfigure a PDCP Packet Data Unit (PDU) into an appropriate size and perform ARQ operations. The main functions of the RLC can be summarized as follows.

[0055] -Data transmission function (transmission of upper layer PDU)

[0056] -ARQ function (error correction through ARQ (for AM data transmission))

[0057] - Concatenation, segmentation and reassembly function (concatenation, segmentation and reassembly of RLC SDU (for UM and AM data transmission))

[0058] - Re-segmentation function (re-segmentation of RLC data PDU (for AM data transmission))

[0059] - Reordering function (reordering of RLC data PDU (for UM and AM data transmission))

[0060] - Duplicate detection function (duplicate detection (for UM and AM data transmission))

[0061] -Error detection function (protocol error detection (for AM data transmission))

[0062] -RLC SDU deletion function (RLC SDU discard (for UM and AM data transmission))

[0063] -RLC reestablishment function (RLC reestablishment)

[0064] The MAC 2-15, 2-30 may be connected to various RLC layer devices included in one UE and perform operations for multiplexing RLC PDUs to and demultiplexing RLC PDUs from MAC PDUs. The main functions of the MAC may be summarized as follows.

[0065] - Mapping function (mapping between logical channels and transport channels)

[0066] - Multiplexing and demultiplexing functions (multiplexing / demultiplexing MAC SDUs belonging to one or more different logical channels into / from a transport block (TB) delivered to / from the physical layer on a transport channel)

[0067] -Scheduling information reporting function (Scheduling information reporting)

[0068] -HARQ function (error correction through HARQ)

[0069] -Logical channel priority control function (priority processing between logical channels of a UE)

[0070] -UE priority control function (priority processing between UEs through dynamic scheduling)

[0071] -Multimedia Broadcast Multicast Service (MBMS) service identification function (MBMS service identification)

[0072] -Transmission format selection function (transmission format selection)

[0073] - Fill function (fill)

[0074] The physical layers 2-20, 2-25 may perform operations for channel coding and modulating upper layer data to generate OFDM symbols and transmitting the OFDM symbols via a wireless channel, or demodulating and channel decoding OFDM symbols received via a wireless channel and transmitting the demodulated and channel-decoded OFDM symbols to an upper layer.

[0075] Figure 3 A structure of a next generation mobile communication system according to an embodiment of the present disclosure is shown.

[0076] Reference Figure 3 , the wireless access network of the next generation mobile communication system (hereinafter referred to as NR or 5g) may include a next generation base station (new wireless node B, hereinafter referred to as NR gNB or NR base station) 3-10 and a next generation wireless core network (new wireless core network, NR CN) 3-05. The next generation wireless user terminal (new wireless user equipment, NR UE or terminal) 3-15 may access an external network through the NRgNB 3-10 and the NR CN 3-05.

[0077] exist Figure 3In the next generation mobile communication system, the NR gNB 3-10 may correspond to an evolved Node B (eNB) in the LTE system of the related art. The NRgNB may be connected to the NR UE 3-15 via a wireless channel and may provide better services than the Node B of the related art. Since all user traffic in the next generation mobile communication system is served through a shared channel, a device for collecting and scheduling status information of the buffer status, available transmit power status, and channel status of the UE may be used, and the NR NB3-10 may be used for scheduling. One NR gNB may control multiple cells. In the next generation mobile communication system, in order to achieve ultra-high-speed data transmission, a bandwidth wider than the maximum bandwidth of the related art may be applied compared to the LTE of the related art. In addition, beamforming technology may also be applied using orthogonal frequency division multiplexing (OFDM) via wireless access technology. In addition, an adaptive modulation and coding (AMC) scheme that determines the modulation scheme and channel coding rate may be applied according to the channel status of the NR UE. The NR CN 3-05 may perform functions of supporting mobility, configuring bearers, and configuring QoS. The NR CN is a device for performing functions of managing the mobility of the NR UE and various control functions, and may be connected to multiple NR gNBs. In addition, the next generation mobile communication system can be linked to the LTE system, and the NR CN can be connected to the MME 3-25 through a network interface. The MME can be connected to the eNB 3-30, which is an LTE base station.

[0078] Figure 4 A wireless protocol structure of a next generation mobile communication system according to an embodiment of the present disclosure is shown.

[0079] refer to Figure 4 , the UE and the NR gNB may include NR Service Data Adaptation Protocol (SDAP) 4-01, 4-45, NR PDCP 4-05, 4-40, NR RLC 4-10, 4-35, NR MAC 4-15, 4-30 and NR PHY 4-20, 4-25 in the radio protocol of the next generation mobile communication system.

[0080] The main functions of NR SDAP 4-01, 4-45 may include some of the following functions.

[0081] -User data transmission function (transmission of user plane data)

[0082] - Functionality of mapping QoS flows and data bearers for uplink and downlink (mapping between QoS flows and data radio bearers (DRBs) for both DL and UL)

[0083] - Functionality to mark QoS flow ID for both uplink and downlink (mark QoS flow ID in both DL and UL packets)

[0084] - Functionality to map Reflective QoS flows to data bearers for uplink SDAP PDUs (Reflective QoS flows to DRB mapping for UL SDAPPDUs)

[0085] Regarding the SDAP layer device, the UE may receive configuration of whether to use the header of the SDAP layer device or the function of the SDAP layer device for each PDCP layer device, each bearer, or each logical channel through an RRC message. When configuring the SDAP header, a 1-bit indicator of the non-access stratum (NAS) reflective quality of service (QoS) (NAS reflective QoS) and a 1-bit indicator of the access stratum (AS) reflective quality of service (QoS) (AS reflective QoS) of the SDAP header may indicate that the UE updates or reconfigures information about the mapping of QoS flows and data bearers in the uplink and downlink. The SDAP header may include QoS flow ID information indicating QoS. QoS information may be used as data processing priority or scheduling information to support seamless services.

[0086] The main functions of NR PDCP 4-05, 4-40 may include some of the following functions.

[0087] -Header compression and decompression function (Header Compression and Decompression: ROHC)

[0088] -User data transmission function (transmission of user data)

[0089] - Sequential delivery function (in-sequence delivery of upper layer PDUs)

[0090] - Out-of-sequence delivery function (out-of-sequence delivery of upper layer PDUs)

[0091] - Reordering function (reordering of received PDCP PDUs)

[0092] - Duplicate detection function (duplicate detection of lower layer SDU)

[0093] -Retransmission function (retransmission of PDCP SDU)

[0094] -Encryption and decryption functions (encryption and decryption)

[0095] - Timer-based SDU removal functionality (timer-based SDU discard in uplink)

[0096] In the above description, the reordering function of the NR PDCP device may refer to a function of sequentially reordering the PDCP PDUs received by the lower layer based on the PDCP sequence number (SN). The reordering function of the NR PDCP device may include a function of sequentially delivering the reordered data to the upper layer, or a function of directly sending the reordered data without considering the sequence, a function of recording the PDCP PDUs lost due to the reordering, a function of reporting the status of the lost PDCP PDUs to the transmitting side, and a function of requesting retransmission of the lost PDCP PDUs.

[0097] The main functions of NR RLC 4-10, 4-35 may include some of the following functions.

[0098] -Data transmission function (transmission of upper layer PDU)

[0099] - Sequential delivery function (in-sequence delivery of upper layer PDUs)

[0100] - Out-of-sequence delivery function (out-of-sequence delivery of upper layer PDUs)

[0101] -ARQ function (error correction through ARQ)

[0102] - Concatenation, segmentation and reassembly function (concatenation, segmentation and reassembly of RLC SDU)

[0103] - Re-segmentation function (resegmentation of RLC data PDU)

[0104] - Reordering function (reordering of RLC data PDU)

[0105] -Duplicate detection function (duplicate detection)

[0106] -Error detection function (protocol error detection)

[0107] -RLC SDU deletion function (RLC SDU discard)

[0108] -RLC reestablishment function (RLC reestablishment)

[0109] In the above description, the in-sequence delivery function (in-sequence delivery) of the NR RLC device may refer to a function of transmitting the RLC PDU received from the lower layer to the upper layer in sequence. The in-sequence delivery function (in-sequence delivery) of the NR RLC device may include: when one original RLC SDU is divided into multiple RLC SDUs and then received, a function of reassembling and sending the RLC SDU.

[0110] The sequential delivery function (in-sequence delivery) of the NR RLC device may include: a function of reordering the received RLC PDU based on the RLC sequence number (SN) or PDCP SN, a function of recording the RLC PDU lost due to reordering, a function of reporting the status of the lost RLC PDU to the transmitting side, and a function of requesting retransmission of the lost RLC PDU.

[0111] The sequential delivery function (in-sequence delivery) of the NR RLC device may include: when there is RLC SDU loss, the RLC SDU before the lost RLC SDU is transmitted to the upper layer in sequence.

[0112] The sequential delivery function (in-sequence delivery) of the NR RLC device may include: if a predetermined timer expires when an RLC SDU is lost, all RLC SDUs received before the timer starts are delivered to the upper layer in sequence.

[0113] The sequential delivery function (in-sequence delivery) of the NR RLC device may include: if a predetermined timer expires when an RLC SDU is lost, and a function of transmitting all RLC SDUs received until that point in time to the upper layer in sequence.

[0114] In addition, the NR RLC device can process the RLC PDUs sequentially in the order of receipt regardless of their sequence (out-of-order delivery), and can transmit the RLC PDUs to the NR PDCP device.

[0115] In the case of segmentation, the NR RLC device can receive segments stored in the buffer or to be received in the future, reconfigure the segments into a complete RLC PDU, and then send it to the PDCP device.

[0116] The NR RLC layer may not include the cascading function, which may be performed by the NR MAC layer or replaced by the multiplexing function of the NR MAC layer.

[0117] In the above description, the non-sequential delivery function (out-of-order delivery) of the NR RLC device may refer to a function of directly transmitting the RLC SDU received from the lower layer to the upper layer regardless of the sequence of the RLC SDU. The non-sequential delivery function (out-of-order delivery) of the NR RLC device may include: a function of reassembling and sending the RLC PDU when one original RLC SDU is divided into multiple RLC SDUs and then received. The non-sequential delivery function (out-of-order delivery) of the NR RLC device may include: a function of storing the RLC SN or PDCP SN of the received RLC PDU, reordering the RLC PDU, and recording the lost RLC PDU.

[0118] NR MAC 4-15, 4-30 can be connected to multiple NR RLC layer devices configured in one UE, and the main functions of NR MAC may include some of the following functions.

[0119] - Mapping function (mapping between logical channels and transport channels)

[0120] -Multiplexing and demultiplexing functions (MAC SDU multiplexing / demultiplexing)

[0121] -Scheduling information reporting function (Scheduling information reporting)

[0122] -HARQ function (error correction through HARQ)

[0123] -Logical channel priority control function (priority processing between logical channels of a UE)

[0124] -UE priority control function (priority processing between UEs through dynamic scheduling)

[0125] -MBMS service identification function (MBMS service identification)

[0126] -Transmission format selection function (transmission format selection)

[0127] - Fill function (fill)

[0128] The NR PHY layers 4-20, 4-25 may perform operations of channel coding and modulating upper layer data to generate OFDM symbols and transmit the OFDM symbols via a wireless channel, or demodulate and channel decode OFDM symbols received via a wireless channel and transmit the demodulated and channel-decoded OFDM symbols to an upper layer.

[0129] Figure 5 A block diagram showing an example of an internal structure of a UE according to an embodiment of the present disclosure. Figure 5 The UE may be a UE that performs sidelink communication. According to an embodiment, the UE may be a reference UE capable of transmitting a sidelink positioning reference signal (PRS) or a target UE that receives auxiliary data (which is configuration information of SL-PRS) and reports a measurement result.

[0130] Reference Figure 5 , the UE includes a radio frequency (RF) processing unit 5-10, a baseband processing unit 5-20, a storage unit 5-30 and a controller 5-40.

[0131] The RF processing unit 5-10 performs functions of sending and receiving signals via a wireless channel, such as converting or amplifying the frequency band of the signal. The RF processing unit 5-10 up-converts the baseband signal provided by the baseband processing unit 5-20 into an RF band signal, transmits the RF band signal via an antenna, and then down-converts the RF band signal received via the antenna into a baseband signal. For example, the RF processing unit 5-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), etc. Although Figure 5 Only one antenna is shown, but the UE may include multiple antennas. The RF processing unit 5-10 may include multiple RF chains. In addition, the RF processing unit 5-10 may perform beamforming. For beamforming, the RF processing unit 5-10 may control the phase and magnitude of each of the signals sent / received through multiple antennas or antenna elements. The RF processing unit may perform MIMO and receive multiple layers when performing MIMO operations.

[0132] The baseband processing unit 5-20 performs the conversion function between the baseband signal and the bit stream according to the physical layer standard of the system. For example, in data transmission, the baseband processing unit 5-20 generates complex symbols by encoding and modulating the transmission bit stream. In addition, in data reception, the baseband processing unit 5-20 reconstructs the received bit stream by demodulating and decoding the baseband signal provided from the RF processing unit 5-10. For example, in an orthogonal frequency division multiplexing (OFDM) scheme, when transmitting data, the baseband processing unit 5-20 generates complex symbols by encoding and modulating the transmission bit stream, maps the complex symbols to subcarriers, and then configures OFDM symbols via an inverse fast Fourier transform (IFFT) operation and a cyclic prefix (CP) insertion. In addition, in data reception, the baseband processing unit 5-20 divides the baseband signal provided by the RF processing unit 5-10 into units of OFDM symbols, reconstructs the signals mapped to the subcarriers through a fast Fourier transform (FFT) operation, and then reconstructs the received bit stream via demodulation and decoding.

[0133] The baseband processing unit 5-20 and the RF processing unit 5-10 can send and receive signals as described above. Therefore, each of the baseband processing unit 5-20 and the RF processing unit 5-10 can be referred to as a transmitter, a receiver, a transceiver or a communication unit. In addition, at least one of the baseband processing unit 5-20 and the RF processing unit 5-10 may include multiple communication modules to support a variety of different wireless access technologies. For example, different wireless access technologies may include wireless LAN (e.g., IEEE802.11), cellular networks (e.g., LTE), etc. In addition, different frequency bands may include super high frequency (SHF) (e.g., 2NRHz, NRHz) bands and millimeter (mm) wave (e.g., 60GHz) bands.

[0134] The storage unit 5-30 stores data such as basic programs, applications, configuration information, etc. for the operation of the UE. In particular, the storage unit 5-30 can store information related to a second access node that performs wireless communication using a second radio access technology. The storage unit 5-30 provides stored data according to a request from the controller 5-40.

[0135] The controller 5-40 controls the overall operation of the UE. For example, the controller 5-40 sends and receives signals through the baseband processing unit 5-20 and the RF processing unit 5-10. In addition, the controller 5-40 records data in the storage unit 5-30 and reads the data. To this end, the controller 5-40 may include at least one processor. For example, the controller 5-40 may include a communication processor (CP) that performs control of communication and an application processor (AP) that controls an upper layer such as an application.

[0136] Figure 6 A block diagram showing an example configuration of an NR base station according to an embodiment of the present disclosure is shown.

[0137] like Figure 6 As shown, the base station includes an RF processing unit 6-10, a baseband processing unit 6-20, a backhaul communication unit 6-30, a storage unit 6-40 and a controller 6-50.

[0138] The RF processing unit 6-10 performs functions of sending and receiving signals via a wireless channel, such as converting or amplifying the frequency band of the signal. The RF processing unit 6-10 up-converts the baseband signal provided by the baseband processing unit 6-20 into an RF band signal, then transmits the frequency-converted signal through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the RF processing unit 6-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc. Although Figure 6 Only one antenna is shown, but the first access node may include multiple antennas. In addition, the RF processing unit 6-10 may include multiple RF chains. In addition, the RF processing unit 6-10 may perform beamforming. For beamforming, the RF processing unit 6-10 may control the phase and magnitude of each of the signals sent and received by the multiple antennas or antenna elements. The RF processing unit may perform downlink MIMO operations by transmitting one or more layers.

[0139] The baseband processing unit 6-20 performs the function of converting between the baseband signal and the bit stream according to the physical layer standard of the first wireless access technology. For example, in data transmission, the baseband processing unit 6-20 generates complex symbols by encoding and modulating the transmission bit stream. In addition, in data reception, the baseband processing unit 6-20 reconstructs the received bit stream by demodulating and decoding the baseband signal provided from the RF processing unit 6-10. For example, according to the OFDM scheme, in data transmission, the baseband processing unit 6-20 can generate complex symbols by encoding and modulating the transmission bit stream, map the complex symbols to subcarriers, and then configure the OFDM symbols via IFFT operation and CP insertion. In addition, in data reception, the baseband processing unit 6-20 divides the baseband signal provided by the RF processing unit 6-10 into units of OFDM symbols, recovers the signal mapped to the subcarriers by FFT operation, and then reconstructs the received bit stream via demodulation and decoding. The baseband processing unit 6-20 and the RF processing unit 6-10 can send and receive signals as described above. Therefore, each of the baseband processing unit 6-20 and the RF processing unit 6-10 may be referred to as a transmitter, a receiver, a transceiver, a communication unit, or a wireless communication unit.

[0140] The backhaul communication unit 6-30 provides an interface for communicating with other nodes in the network. The backhaul communication unit 6-30 converts a bit stream to be sent from the master base station to another node (eg, a secondary base station or a core network) into a physical signal, and converts a physical signal received from another node into a bit stream.

[0141] The storage unit 6-40 stores data such as basic programs, applications, configuration information, etc. for the operation of the main base station. Specifically, the storage unit 6-40 can store information about the bearer allocated to the accessed UE, the measurement results reported from the accessed UE, etc. In addition, the storage unit 6-40 can store information as a reference for determining whether to provide or stop multiple connections to the UE. The storage unit 6-40 provides the stored data according to a request from the controller 6-50.

[0142] The controller 6-50 controls the overall operation of the base station. For example, the controller 6-50 may send and receive signals through the baseband processing unit 6-20 and the RF processing unit 6-10 or through the backhaul communication unit 6-30. In addition, the controller 6-50 records data in the storage unit 6-40 and reads data. To this end, the controller 6-50 may include at least one processor.

[0143] According to an embodiment of the present disclosure, when positioning is performed via sidelink communication, positioning may be performed through the following process.

[0144] The target UE and the reference UE are UEs that can perform sidelink positioning together and can discover each other by using discovery messages.

[0145] Discovery messages can be of the following types and can include different information:

[0146] Discovery advertisement for sidelink positioning (SL-P); and

[0147] • ProSe application code indicating the execution of sidelink positioning or the reference UE serving during sidelink positioning.

[0148] Alternatively, in addition to the ProSe application code, an indicator indicating a reference UE role for sidelink positioning may be included.

[0149] The required capabilities of the UE that is expected to be found can be expressed. For example, it can indicate whether SL-P is executable or whether SL-PRS transmission is executable.

[0150] SL-P discovery solicitation:

[0151] A separate indicator or Prose query code may be included to indicate the performance of sidelink positioning or the target UE role of SL-P; and

[0152] • The required capabilities of the UE that it is desired to find may be expressed and may indicate, for example, whether SL-P is executable or whether SL-PRS measurement is executable.

[0153] SL-P's discovery response:

[0154] A separate indicator or ProSe response code indicating a response to a discovery message for the execution of SL-P or the reference UE role of SL-P may be included.

[0155] In discovery message model A, when the reference UE sends a discovery notification message, the target UE may receive the message. When the message includes an SL-P application code or a reference UE role indicator for the sidelink positioning service, and when the target UE wants to perform SL-P with the sending reference UE, the target UE may establish a PC5 unicast link with the reference UE.

[0156] In the discovery message model B, when the target UE sends a solicitation message, the reference UE determines the content of the message and then performs a response via a response message when it is desired to perform SL-P.

[0157] The role of the transmitting UE in each message transmitted in Model A or Model B may be changed. In this case, each role-related indicator, ProSe application code, or ProSe response code may include a role according to which the transmitting UE is determined and then be transmitted.

[0158] The notification message or solicitation / response message may also include SL-P related capability information or preference information. The related information may include:

[0159] The supported or preferred SL-P method information and SL-PRS reception capability information in the notification message sent by the reference UE may include;

[0160] The supported or preferred SL-P method information and SL-PRS transmission capability information in the notification message sent by the target UE;

[0161] The target UE’s supported or preferred SL-P method information and SL-PRS sending capability information in the solicitation message sent by the target UE;

[0162] Refer to the SL-P method information and SL-PRS reception capability information supported or preferred by the UE in the response message sent by the UE;

[0163] Refer to the SL-P method information and SL-PRS reception capability information supported or preferred by the UE in the solicitation message sent by the UE;

[0164] The target UE shall include the SL-P method information and SL-PRS transmission capability information supported or preferred by the target UE in the response message sent by the target UE;

[0165] When the discovery message includes SL-P related capability information / preference information, a discard or release procedure of the UE discovered via the additional SL-P related capability information procedure on the PC5 link may be added after the corresponding discovery procedure.

[0166] The target device and one of the discovered reference devices may establish a PC5 unicast connection.

[0167] PC5 unicast connections may be established via message sending / receiving over the generic PC5-S protocol.

[0168] After establishment, the reference UE and the target UE can send and receive messages about the following via the PC5 unicast connection. At this time, each message can use one of the protocol architecture options 1 to 3 given separately.

[0169] Ranging request / response: When the role information of the sending UE that has sent the message and / or the expected role information about the corresponding part UE and the SL-P capability information of the sending UE are included and sent, the receiving UE can accept the request to participate in SL-P (or ranging) when the sending UE wants the role to be executable by the sending UE.

[0170] The request message may include at least one of the following information:

[0171] A ranging / SL-P role indicator indicating one of the reference UE or the target UE as a SL-P or ranging factor;

[0172] An indicator indicating whether the ranging / SL-P is a one-time ranging / SL-P or a periodic ranging / SL-P;

[0173] An indicator as to whether ranging / SL-P is used to obtain range, direction, or both range and direction;

[0174] Preferred SL-PRS configuration information, supported positioning frequency layers, supported or preferred SL-P methods;

[0175] Ranging / SL-P capability information and / or a message or indicator requesting to receive UE's SL-P / ranging capability information;

[0176] · SL-PRS configuration information to be measured by the receiving UE for SL-P. This information may be the target frequency, BWP and resource pool for the sending UE of the message to send the SL-PRS, and / or may be the target frequency, BWP and resource pool information for the receiving UE of the message to receive and measure the SL-PRS.

[0177] The request message may be a PC5-RRC message or a PC5-S message.

[0178] The response message may include the following information:

[0179] When the sending UE of the message wants to change the role requested in the request message, an indicator of its desired role; and

[0180] • Preferred SL-PRS configuration information, which may include positioning frequency layer or preferred SL-PRS method.

[0181] When the received request message includes the SL-P capability information of the UE sending the request message, the sending UE can determine whether it can respond to the information after checking the information, and indicate yes / no in the response message; and / or, when the request message includes an indicator requesting the capability information of the UE receiving the request message, the response message may include the corresponding SL-P / ranging-related capability information of the UE sending the response message.

[0182] When the request message includes SL-PRS configuration information sent by the request receiving UE corresponding to the information requested by the request message sending UE, the response sending UE may indicate whether to allow the corresponding configuration information.

[0183] When the request message contains information that the receiving UE of the request message requests measurement, the response message may include an indicator indicating whether the receiving UE approves or disapproves the request.

[0184] When the request message contains information about whether it is a one-time positioning or a periodic positioning, information about whether it is used to obtain distance or direction or both distance and direction, or information about a preferred positioning method, the receiving UE can indicate yes / no for each requested item in a separate field, which indicates whether the corresponding requested information is acceptable.

[0185] The message can be a PC5-RRC or PC5-S message.

[0186] When the UE that has sent / received the message expects to participate in ranging, the UE may send configuration information to its own AS layer based on the SL-P related configuration information included in the message, and enable the AS layer to perform SL-P operations based on the corresponding configuration information.

[0187] As a SL-P operation, a UE determined as a transmitting UE transmits a SL-PRS. A UE determined as a receiving UE may receive and / or measure the transmitted SL-PRS and deliver the measurement result back to the network or the SL-PRS transmitting UE.

[0188] Capability Request / Response / Notification: Messages used to request capability information of each UE associated with the SL-P, respond to the request, or transmit its own capability information.

[0189] The capability request message may include the following information:

[0190] Information can be requested about whether each SL-POS method (e.g., Sidelink Observed Time Difference of Arrival (SL-OTDOA), Sidelink Angle of Departure (SL-AoD), Sidelink Time Difference of Arrival (SL-TDoA), Sidelink Angle of Arrival (SL-AoA), Sidelink Round Trip Time (SL-RTT), etc.) is supported.

[0191] The capability response message may include the following information:

[0192] Information on whether segmentation of SL-P related messages is supported; and

[0193] Information about supported methods among the SL-POS methods.

[0194] Capability notification messages may include the following information:

[0195] Information on whether segmentation of SL-P related messages is supported and on supported methods among SL-POS methods.

[0196] Request Assistance Data / Provide Assistance Data: Messages used to request or provide assistance data information related to SL-P.

[0197] The Provide Assistance Data message may include the following information:

[0198] Since the information is provided by the UE that transmits the SL-PRS, at least one of the following information: The information may be information about the frequency at which the SL-PRS is transmitted, the absolute radio frequency channel number (ARFCN) or the positioning frequency layer, the BWP, the resource pool information, or the symbol SL-PRS time / frequency position information.

[0199] When a UE that should measure the SL-PRS fails to receive the Provide Assistance Data message, a Request Assistance Data message may be delivered to the corresponding SL-PRS transmitting UE.

[0200] Request location information / provide location information:

[0201] ·Request location information message: sent by the SL-PRS sending UE. This is a message requesting the measurement target UE (reference UE) to perform measurements and report in a given format. The message may indicate the measurement method preferred by the SL-PRS sending UE, and may include the report or positioning method configuration to be delivered. The reporting or positioning method may refer to a one-time measurement report or a periodic measurement report. The reporting or positioning method may also include an indication of whether the measurement is for distance, orientation, or both distance and orientation. The receiving UE receiving the indication may measure the SL-PRS according to the method. From the perspective of the UE sending the provide assistance data and request location information message, the UE may start SL-PRS transmission before sending the request location information message or after sending the provide assistance data message;

[0202] ·Provide location information: A message used when a UE that has measured the SL-PRS sends the measurement result to a UE that has requested to send the measurement result. When the UE that has performed the measurement knows its own relative position or absolute position information, the message may include the corresponding information and then be delivered. In this case, as the SL-PRS measurement result, not only the signal strength of the SL-PRS and the difference in arrival time between transmission paths, but also the relative or absolute position information of the SL-PRS sending UE may be delivered together in consideration of its own relative position or absolute position based on the measurement result when requested by the UE requesting the location information. This information may be sent as a separate message as follows; and

[0203] Position result sharing message: This message is used to deliver the final positioning result value to the target UE or the UE that has sent the SL-PRS. The reference UE combines the result value of the SL-PRS measured thereby with its own position information to obtain the final positioning result value.

[0204] When a message is delivered to PC5, the following protocol architecture may be used depending on the message type.

[0205] Option 1. Use PC5-RRC layer

[0206] In a first example, the PC5-RRC layer may be used, such as Figure 7 As shown. When the PC5-RRC layer is used, the PC5-RRC can be configured under the SL-P. The SL-P message can be encoded or encapsulated separately in a specific PC5-RRC message, or included as part of a field of a specific PC5-RRC message. Alternatively, the new PC5-RRC message can include the SL-P message information. In each case, the peer UE can extract the encapsulated SL-P message from the received PC5-RRC message, or receive the SL-P message from the included field.

[0207] When using PC5-RRC message, SL-P message can be sent via SL-SRB3.

[0208] In another example, when the PC5-RRC protocol is used and the UE sends an SL-P message, a separate dedicated SL-SRB can be established and transmission / reception can be performed via the corresponding SRB. For example, a PC5-RRC message including SL-P information can be sent / received via a separate SL-SRB (not SRB3) different from other PC5-RRC messages.

[0209] Option 2. Use PC5-S layer

[0210] In the second example, the PC5-S layer can be used, such as Figure 8As shown. When the PC5-S layer is used, the PC5-S or ProSe layer / entity can be utilized. The SL-P message / information can be encapsulated in a specific PC5-S message, or a specific PC5-S message can become a SL-P specific message. In each case, the peer UE can extract the encapsulated SL-P message from the received PC5-S message, or receive the SL-P message from the included fields.

[0211] When using PC5-S, transmission can be performed via SL-SRB0, SL-SRB1, or SL-SRB2 according to the progress of PC5-S security.

[0212] In another example, when the PC5-S protocol is used and the UE sends an SL-P message, a separate dedicated SL-SRB may be established and transmission / reception may be performed via the corresponding SRB. For example, a PC5-S message including SL-P information may be transmitted / received via an SL-SRB different from other PC5-S messages (e.g., an SRB different from SRB0, SRB1, SRB2).

[0213] Option 3. Use a discovery layer

[0214] As another example, Fig. 9 As shown, a discovery layer may be used. In the case of using a discovery layer, similarly, an SL-P message may be encapsulated inside a discovery message, or an SL-P specific discovery message may be included therein.

[0215] When the SL-P message is sent in conjunction with the discovery message, the PC5-RRC unicast link establishment may not be performed. In addition, the discovery SL-SRB may be utilized.

[0216] As a discovery message for SL-P purposes, the following situations can be considered. An anchor UE (reference UE) can send a discovery solicitation message. The discovery solicitation message can be decoded / interpreted by a UE having an L2 destination ID value for discovery purposes and previously assigned to multiple peer UEs. The discovery solicitation message may include a message type / information indicating that the UE is a reference UE for SL-P discovery or an SL-P as a corresponding discovery message type. In addition, the discovery solicitation message may include the transmitted reference UE information, information about the target UE to be found by the reference UE, and the capabilities of the reference UE. The target UE may view and interpret the discovery solicitation message to comply with the SL-P discovery of the corresponding reference UE, and view the UE information or capabilities of the corresponding reference UE, and the target UE may determine that it is to be discovered. When the determination is completed, the target UE may also send a discovery solicitation response message as a discovery message for SL-P purposes. The discovery solicitation response message may be sent via unicast, multicast, or broadcast. The discovery solicitation response message may include a message type / information indicating that the UE is a target UE for SL-P discovery or an SL-P as a discovery message type. When the reference UE that has received the discovery solicitation response message meets the capabilities of the corresponding target UE and meets the requested reference UE information, the reference UE can establish a PC5 direct unicast link with the target UE and then send / receive a PC5-RRC or PC5-S message including SL-P information.

[0217] In another embodiment, as a discovery message for SL-P purposes, the target UE may send a discovery notification message. The discovery notification message may include a message type / information indicating that the UE is the target UE requesting SL-P. In addition, the discovery notification message may include target UE information to be transmitted, reference UE information to be obtained, and capability information of the target UE. When the reference UE that has received the discovery notification message meets the capabilities of the corresponding target UE and meets the requested reference UE information, the reference UE may establish a PC5 direct unicast link with the target UE, and then send / receive a PC5-RRC or PC5-S message including SL-P information.

[0218] As another embodiment, the reference UE may send a discovery notification message. The information that may be included in the discovery notification message by the reference UE may include information suitable for the purpose of the discovery message as described above. The target UE that has received the discovery notification message may establish a PC5 direct unicast link with the reference UE when determining that the corresponding reference UE matches itself, and then send / receive a PC5-RRC or PC5-S message including SL-P information.

[0219] As another embodiment, the target UE may send a discovery solicitation message. The information that may be included in the discovery solicitation message by the target UE may be information suitable for the purpose of the discovery message as described above. The reference UE that has received the discovery solicitation message may send a discovery solicitation response message when determining that the corresponding target UE matches itself. The information that may be included in the discovery solicitation response message by the reference UE may include information suitable for the purpose of the discovery message as described above. The target UE that has received the discovery solicitation response message may establish a PC5 direct unicast link with the reference UE, and then send / receive a PC5-RRC or PC5-S message including SL-P information.

[0220] The above options can be selectively used according to the type of each message.

[0221] Fig.10 A sequence diagram illustrating an example of performing a ranging operation and SL-P between UEs when a ranging request message and a response message are introduced according to an embodiment of the present disclosure.

[0222] Fig.10 A description of each message step follows.

[0223] In S1010, UE1 1000, UE2 1001 and PCF 1002 may perform authentication and policy provision. (1. UE1 and UE2 may obtain ranging authorization policies and parameters from PCF during the registration process. The ranging authorization policies and parameters may include whether the UE is authorized as a reference UE or a target UE.) Fig.10 In the embodiment, UE1 1000 may be a reference UE and UE2 1001 may be a target UE.

[0224] In S1020, UE1 1000 and UE2 1001 may perform UE discovery. (2. When UE1 obtains a ranging request from an application layer, another UE, or a 5GC NF, UE1 may discover UE2 by using a solution for KI#3 ranging / sidelink positioning device discovery.)

[0225] In S1030, UE1 1000 and UE2 1001 may perform PC5 connection establishment. ((3. UE1 and UE2 may perform PC5 connection establishment, as defined in TS23.304[4].

[0226] Note: PC5 connection is established for signaling exchange of ranging parameters between two UEs. This step can be used optionally when ranging / sidelink positioning is between two UEs. )

[0227] In S1040, UE1 1000 may send a ranging request message including ranging parameters to UE2 1001. (4. UE1 sends a ranging request to UE2 to negotiate the ranging parameters, and the ranging request may be a new PC5-S signaling carried by the PC5 connection. The ranging request includes ranging parameters, such as ranging role (reference UE or target UE), one-time or periodic ranging, and whether ranging is used for distance measurement or direction measurement or both. The ranging parameters may also include a preferred SL-PRS configuration, such as supported positioning frequency layers and / or supported / preferred SL-P methods. SL-P capability information (or SL-P capability request message / indication) may also be transmitted in the message.

[0228] In addition, the request message may include SL-PRS configuration information that UE2 measures for positioning. The SL-PRS configuration information may include the frequency, BWP, and resource pool for SL-PRS that UE1 will send SL-PRS, and / or the frequency, BWP, and resource pool of SL-PRS that UE2 will receive and measure for positioning. This information may also be the SL-P capability information of UE1 in step 7-1 and the SL-P assistance data in step 7-2.

[0229] In addition, the request message may include a measurement request indication to UE2 for information about a preferred method, a reporting configuration about one-time measurement / reporting or periodic measurement / reporting, and a metric about direction or distance or both direction and distance, as in step 7-3.

[0230] UE1 may determine the ranging role based on the ranging grant or ranging capability (capability as a reference UE or target UE) in step 1. For example, UE1 decides to act as a reference UE, then the ranging role means "I am a reference UE" or "You are a target UE".

[0231] When the application layer sends a ranging request to an upper layer (eg, ranging layer), UE1 may obtain one-time or periodic ranging from the application layer, the ranging being for distance measurement or direction measurement, or both distance measurement and direction measurement.

[0232] The ranging request message may be carried in a PC5-RRC message or a PC5-S message. )

[0233] In S1050, UE2 1001 may send a ranging response message to UE1 1000. (5. UE2 sends a ranging response to UE1. If UE2 wants to change the ranging role (e.g., UE2 wants to act as a reference UE), for example due to its ranging capabilities, the new ranging role is included. Once UE2 has a preferred SL-PRS configuration, such as positioning frequency layer (PFL) or SL-P method, UE2 may also include this information in the message. If SL-P capability information is included in step 4, UE2 may check whether the capability matches. Alternatively, if a SL-P capability request message / indication is received in step 4, UE2 may respond by including UE2's SL-P capabilities.

[0234] If UE2 receives the SL-PRS configuration information from UE1 in step 4, UE2 may respond to accept or not accept the SL-PRS.

[0235] If UE2 receives the measurement request from UE1 in step 4, UE2 may respond to accept or not accept.

[0236] The ranging response message may be carried in a PC5-RRC message or a PC5-S message. )

[0237] In S1060, each of UE1 1000 and UE2 1001 may configure ranging. (6. The upper layer of each UE (e.g., UE1 and UE2) provides ranging configuration to the AS layer. The ranging configuration includes ranging role (e.g., whether each UE is a reference UE or a target UE), one-time or periodic ranging, and whether ranging is for distance measurement or direction measurement, or both distance measurement and direction measurement.)

[0238] In S1070, UE1 1000 and UE2 1001 may perform a ranging signaling process and calculate a measurement result. (7. The AS layer of each UE sends or receives ranging signaling according to the ranging configuration, and the reference UE calculates the ranging result. For example, for direction measurement, the target UE sends ranging signaling, and the reference UE receives it accordingly.)

[0239] 7-1.UE1 or reference UE may send a SL-P capability information request message to UE2 or target UE. UE2 or target UE may respond by sending SL-P capability information. The SL-P capability information may be carried in a PC5-RRC or PC5-S message. This step may be omitted if step 4 has a capability information transaction.

[0240] 7-2.UE1 or the reference UE may send SL-P assistance data, which includes the SL-PRS configuration to be measured by UE2 or the target UE, including PFL, symbol-level resources, and frequency and time information to be sent by UE1. If UE2 or the target UE receives the message, it stores the information for measurement. If there is no assistance data, UE2 or the target UE may request assistance data from UE1. The assistance data and assistance data request message may be carried in the PC5-RRC / PC5-S message.

[0241] 7-3UE1 may send a measurement request to UE2, which is for information about the preferred method and report configuration and report about one-time measurement or periodic measurement, and measurement metrics for direction or distance, or measurement metrics for both direction and distance. UE2 may further respond to the message.

[0242] 7-4UE1 sends SL-PRS based on the configuration in step 7-2. UE1 may then send a SL-PRS measurement request including a preferred method and a report configuration such as periodic or one-time reporting. UE2 may measure the SL-PRS, and if UE2 can meet the required measurement QoS, UE2 may report the results including the measurement values ​​of the indicated method based on the report configuration (displaying the result values ​​for each case). For example, if distance is required, a SL-P method requiring RSRP measurement may be configured for the SL-P method, or if direction is required, a SL-P method such as UL / DL-AOD or AoA method may be configured. The measurement request and its report message may be carried in a PC5-RRC / PC5-S message.

[0243] 7-5. If the messages in step 4 and step 5 include SL-PRS configuration information, there may be no steps 7-1 and 7-2 above. If the messages in step 4 and step 5 include a measurement request and its response, there may be no step 7-3. )

[0244] In S1080, UE1 1000 and UE2 1001 may share the measurement result. (8. For example, the ranging result may be shared between UEs via PC5-S signaling.

[0245] 8-1.UE1 can find the location based on the measurement results, and the location information can be sent to UE2. This message can be carried in the PC5-RRC / PC5-S message. )

[0246] Fig.11 A sequence diagram showing an example of exchanging SL-P dedicated messages between UEs without ranging request / response messages after a unicast link is established according to an embodiment of the present disclosure.

[0247] A description of each step follows.

[0248] In S1110, UE A (target UE) 1100 and UE B (reference UE) 1101 may perform authentication and policy provisioning. (1. UE A and UE B may obtain ranging authorization policies and parameters from the PCF during the registration process. The ranging authorization policies and parameters may include whether the UE is authorized as a reference UE or a target UE. According to an embodiment, it is assumed that UE A is a target UE and UE B is a reference UE.)

[0249] In S1120, the reference UE 1101 may send a discovery notification message in model A. In addition, in model B, the target UE 1100 sends a discovery request message, and the reference UE receiving the discovery request message may send a discovery response message. (2. When UE A obtains a ranging request from the application layer, other UEs, or 5GC NF, UE A may discover UE B through ranging / sidelink positioning device discovery.

[0250] 2-1. When a request comes from an application, this layer triggers the SL-POS service and indicates the role, one-time / periodic ranging, and distance or direction or both, and positioning discovery method to the SL-P layer.

[0251] 2-2. There are two options in discovery as to which information can be included in the discovery transaction.

[0252] Option 1. The discovery message carries restricted information for discovery, such as the discovery message type, ranging / sidelink positioning service code, and target UE capabilities (e.g., ranging support) in the announcement message of model A, or the solicitation message (reference UE to target UE) in model B may include the discovery message type and ranging / sidelink positioning service code in the response message (target UE to reference UE). In this case, SL-P related capabilities may be transmitted after the PC5 unicast link is established. In addition, UEs that do not meet the SL-P capabilities will be discarded, i.e., released by the target UE after the unicast link is established.

[0253] Option 2. Light SL-P related capabilities: target UE information / reference UE information, role indication, target UE / reference UE, SL-P service availability, supported SL-P methods, capabilities on Tx SL-PRS, upper limit on Rx SL-PRS. In this case, additional SL-P related heavy capabilities should be transmitted after PC5 unicast link establishment. The outstanding UEs will then be discarded / released after the unicast link is established.

[0254] Option 3. The discovery message also carries heavy SL-P related capabilities to find UEs that meet those capabilities, such as SL-POS capabilities including SL-POS resource preference information, positioning reference unit (PRU) / road side unit (RSU) capabilities / feature indications, per SL-P methods, supported frequency bands. In this case, there is no situation where a unicast link is established with a UE that does not meet the SL-P capability requirements. )

[0255] In S1130, UE A 1100 may establish a PC5 unicast link with UE B 1101. At this point, all of the following SL-P messages may be sent using PC5-S in Option 1 for SL-P signaling, or may be sent using PC5-RRC in Option 2 for SL-P signaling. (3. UE A or UE B may send UECapabilityEnquirySidelink to UE B or UE A, respectively. In this message, an SL-P capability query request indication may be included. A response message of UECapabilityInformationSidelink may be transmitted by the receiving UE, including SL-P capability information. In this case, step 4-1 may be optional.)

[0256] In S1140, SL-P messages may be processed on the unicast link. (The SL-P protocol architecture option may be used here.) In addition, SL-P capabilities may be processed, and SL-P auxiliary data may be processed.

[0257] 4-1 SL-P capability transaction: When option 1 and / or option 2 are used in step 2, UE B (1101) requests SL-P capability information from UE A (1100). If option 3 is used, the remaining heavy SL-P capability information is requested / responded.

[0258] After 4-1, when the initiator cannot meet the required capabilities of the SL-P, the initiator of the discovery transaction or capability request message may discard or release the other UE.

[0259] 4-2 The reference UE (UE B) (1101) determines its SL-PRS resource TX pool, and sends information about the SL-PRS resources to be measured and measurement configuration information (i.e., report configuration, one-time / periodic measurement, one-time report / periodic report, etc.) to the target UE (UE A) (1100) within AD.

[0260] If UE A (target UE) (1100) responds to the AD positively, UE B (reference UE) (1101) may proceed to 4-3. UE B (reference UE) (1101) may start transmission of SL-PRS for positioning with UE A (target UE) (1100).

[0261] In S1150 , UE B (reference UE) 1101 may initiate transmission of SL-PRS. In S1160 , UE B (reference UE) 1101 may send RequestLocationInformation to UE A (target UE) 1100 .

[0262] In S1170, UE A (target UE) 1100 may measure the SL-PRS. In S1180, UE A (target UE) 1100 may send ProvideLocationInformation to UE B (reference UE) 1101. (4-3. UE B (reference UE) (1101) may send an SL-P message including a request for measurement of the SL-PRS for a given SL-PRS resource (pool) configuration to UE A (target UE) (1100), and request to report the measurement result to UE B (reference UE) (1101). If the reporting configuration indicates a one-time report, step 4-3 includes a one-time transmission of the ProvideLocationInformation message. If the reporting configuration indicates periodic measurement / reporting, step 4-3 may repeat the measurement and report the measurement result.)

[0263] In S1190, UE B (reference UE) 1101 may perform position estimation. In S1200, UE B (reference UE) 1101 may send SL-P position information to UE A (target UE) 1100. (5. The reference UE may transmit an estimated position based on its own position information and the measurement results received from the target UE.)

[0264] In the present disclosure, SL-P may refer to sidelink positioning, and ranging may refer to distance / direction measurement. SL-P and ranging may indicate SL-P or ranging or both, rather than indicating one or either alone, even if not explicitly stated.

[0265] The methods of various embodiments described in the claims or the specification of the present disclosure may be implemented by hardware, software, or a combination of hardware and software.

[0266] When the method is implemented by software, a computer-readable storage medium for storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium may be configured to be executed by one or more processors in an electronic device. At least one program may include instructions for causing an electronic device to execute the method defined by the attached claims and / or disclosed herein according to various embodiments of the present disclosure.

[0267] The program (software module or software) can be stored in a non-volatile memory, including random access memory and flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), magnetic disk storage device, compact disk-ROM (CD-ROM), digital versatile disk (DVD) or other types of optical storage devices or magnetic boxes. Or, any combination of some or all of them can form a memory storing the program. In addition, multiple such memories can be included in the electronic device.

[0268] In addition, the program can be stored in an attachable storage device that can access the electronic device through a communication network such as the Internet, an intranet, a local area network (LAN), a wide area network (WLAN), and a storage area network (SAN) or a combination thereof. Such a storage device can access the electronic device via an external port. In addition, a separate storage device on a communication network can access the portable electronic device.

[0269] In the above detailed embodiments of the present disclosure, the elements included in the present disclosure are expressed in the singular or plural, depending on the detailed embodiments presented. However, for ease of description, the singular form or plural form is appropriately selected as presented, and the present disclosure is not limited to the elements expressed in the singular or plural. Therefore, an element expressed in the plural may also include a single element, or an element expressed in the singular may also include multiple elements.

[0270] Although specific embodiments have been described in the detailed description of the present disclosure, it is apparent that various modifications and changes may be made thereto without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure should not be limited to the embodiments, but should be defined by the appended claims and their equivalents.

[0271] Although the present disclosure has been described with various embodiments, various changes and modifications may be suggested to one skilled in the art. The present disclosure is intended to encompass such changes and modifications as fall within the scope of the appended claims.

Claims

1. A method performed by a first terminal in a sidelink communication system, the method comprising: sending a discovery message for sidelink positioning, the discovery message comprising a proximity service (ProSe) application code indicating the sidelink positioning; establishing a link for the sidelink positioning with a second terminal; Sending sidelink positioning assistance data to the second terminal, where the sidelink positioning assistance data includes sidelink positioning reference signal PRS configuration information; Based on the PRS configuration information, sending at least one PRS to the second terminal; and A measurement result for the at least one PRS is received from the second terminal.

2. The method according to claim 1, further comprising: determining positioning information based on the received measurement results; as well as The determined positioning information is sent to the second terminal.

3. The method according to claim 1, further comprising: Sending a ranging request message including at least one ranging parameter to the second terminal; as well as receiving a ranging response message from the second terminal in response to the ranging request message, The at least one ranging parameter includes at least one of a supported positioning frequency layer, a preferred sidelink positioning method, or sidelink positioning capability information, and The ranging response message includes information on whether the at least one ranging parameter included in the ranging request message is accepted by the second terminal.

4. The method according to claim 1, wherein: Sending the sidelink positioning assistance data further comprises: Determine the sidelink PRS resources to be used for measurement, The PRS configuration information further includes at least one of the determined sidelink PRS resources, measurement period information or reporting period information.

5. A method performed by a second terminal in a sidelink communication system, the method comprising: receiving a discovery message for sidelink positioning, the discovery message comprising a proximity service (ProSe) application code indicating the sidelink positioning; establishing a link for the sidelink positioning with a first terminal; Receiving sidelink positioning assistance data from the first terminal, the sidelink positioning assistance data comprising sidelink positioning reference signal (PRS) configuration information; Based on the PRS configuration information, receiving at least one PRS from the first terminal; measuring the at least one PRS; and Sending a measurement result of the at least one PRS to the first terminal.

6. The method according to claim 5, further comprising: Positioning information determined by the second terminal based on the measurement result is received from the second terminal.

7. The method according to claim 5, further comprising: receiving, from the first terminal, a ranging request message including at least one ranging parameter; as well as sending a ranging response message to the first terminal in response to the ranging request message, The at least one ranging parameter includes at least one of a supported positioning frequency layer, a preferred sidelink positioning method, or sidelink positioning capability information, The ranging response message includes information on whether the at least one ranging parameter included in the ranging request message is accepted by the second terminal, The sidelink PRS resource used for measurement is determined by the first terminal, and The PRS configuration information further includes at least one of the determined sidelink PRS resources, measurement period information or reporting period information.

8. A first terminal in a sidelink communication system, the first terminal comprising: Transceiver; as well as at least one processor, the at least one processor being configured to: sending, via the transceiver, a discovery message for sidelink positioning, the discovery message comprising a proximity service (ProSe) application code indicating the sidelink positioning; establishing a link for the sidelink positioning with a second terminal; Sending sidelink positioning assistance data to the second terminal via the transceiver, the sidelink positioning assistance data including sidelink positioning reference signal (PRS) configuration information; Based on the PRS configuration information, sending at least one PRS to the second terminal via the transceiver; and A measurement result for the at least one PRS is received from the second terminal via the transceiver.

9. The first terminal according to claim 8, wherein: The at least one processor is further configured to: determining positioning information based on the received measurement results; and The determined positioning information is sent to the second terminal via the transceiver.

10. The first terminal according to claim 8, wherein: The at least one processor is further configured to: sending, via the transceiver, a ranging request message including at least one ranging parameter to the second terminal; and receiving, via the transceiver, a ranging response message from the second terminal in response to the ranging request message, The at least one ranging parameter includes at least one of a supported positioning frequency layer, a preferred sidelink positioning method, or sidelink positioning capability information, and The ranging response message includes information on whether the at least one ranging parameter included in the ranging request message is accepted by the second terminal.

11. The first terminal according to claim 8, wherein: The at least one processor is further configured to: Determine the sidelink PRS resources to be used for measurement, The PRS configuration information further includes at least one of the determined sidelink PRS resources, measurement period information or reporting period information.

12. A second terminal in a sidelink communication system, the second terminal comprising: Transceiver; as well as at least one processor, the at least one processor being configured to: receiving a discovery message for sidelink positioning, the discovery message comprising a proximity service (ProSe) application code indicating the sidelink positioning; establishing a link for the sidelink positioning with a first terminal; Receiving sidelink positioning assistance data from the first terminal via the transceiver, the sidelink positioning assistance data comprising sidelink positioning reference signal (PRS) configuration information; Based on the PRS configuration information, receiving at least one PRS from the first terminal via the transceiver; measuring the at least one PRS; and The measurement result of the at least one PRS is sent to the first terminal via the transceiver.

13. The second terminal according to claim 12, wherein: The at least one processor is further configured to: Positioning information determined by the second terminal based on the measurement result is received from the second terminal via the transceiver.

14. The second terminal according to claim 12, wherein: The at least one processor is further configured to: receiving, via the transceiver, a ranging request message including at least one ranging parameter from the first terminal; and In response to the ranging request message, sending a ranging response message to the first terminal via the transceiver, The at least one ranging parameter includes at least one of a supported positioning frequency layer, a preferred sidelink positioning method, or sidelink positioning capability information, and The ranging response message includes information on whether the at least one ranging parameter included in the ranging request message is accepted by the second terminal.

15. The second terminal according to claim 12, wherein: The sidelink PRS resource used for measurement is determined by the first terminal, The PRS configuration information further includes at least one of the determined sidelink PRS resources, measurement period information or reporting period information.

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