Method and apparatus for configuring transmission of sounding reference signal for estimating position of inactive terminal in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a terminal in a wireless communication system is provided. The method comprises: receiving a radio resource control (RRC) release message related to a radio resource control (RRC) inactive state, including sounding reference signal (SRS) configuration information for positioning provided in a pre-configuration type; identifying an event in which SRS configuration information for positioning needs to be activated; and transmitting an RRC recovery request message to a base station configured to operate a cell belonging to an active area of the SRS configuration information for positioning.

Description

Technical Field

[0001] The present disclosure relates to the operation of a UE and a gNB in ​​a wireless communication system. More specifically, the present disclosure relates to a method and apparatus for providing a service for locating a UE in an inactive state in a wireless communication system. Background Art

[0002] 5G mobile communication technology defines a wide frequency band to achieve high transmission rates and new services, 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 mmWave (millimeter wave) 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] In the initial stage of 5G mobile communication technology, in order to support services and meet performance requirements related to enhanced mobile broadband (eMBB), ultra-reliable and low-latency communication (URLLC) and massive machine-type communication (mMTC), there is ongoing standardization on the following items: beamforming and massive MIMO for mitigating radio wave path loss and increasing radio wave transmission distance in millimeter waves, parameter sets for dynamic operation of efficient utilization of millimeter wave resources and time slot formats (for example, 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-capacity data transmission and polar codes for highly reliable transmission of control information), L2 preprocessing, and network slicing for providing dedicated networks customized for specific services.

[0004] Currently, in view of the services to be supported by 5G mobile communication technology, discussions are ongoing on improvements and performance enhancements of initial 5G mobile communication technology, and there is already physical layer standardization on technologies such as: Vehicle-to-Everything (V2X), for assisting driving determination of autonomous vehicles based on information about the location and status of the vehicle sent by the vehicle and for enhancing user convenience; New Radio Unlicensed (NR-U), designed to comply with various regulatory-related requirements for system operation in unlicensed bands; NR UE power saving; Non-Terrestrial Network (NTN), which is UE satellite direct communication for ensuring coverage in areas where communication with terrestrial networks is unavailable; and positioning.

[0005] In addition, in the field of wireless interface architecture / protocol, there is already ongoing standardization on technologies such as the Industrial Internet of Things (IIoT) for supporting new services through interworking and convergence 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 switching and DAPS (Dual Active Protocol Stack) switching, and two-step random access (two-step RACH for NR) for simplifying the random access procedure. There is also ongoing standardization in the field of system architecture / services for 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] If such a 5G mobile communication system is commercialized, the already exponentially growing number of connected devices will be connected to the communication network, and it is accordingly expected that enhanced functions and performance of the 5G mobile communication system and integrated operations of the connected devices will be necessary. To this end, new research related to extended reality (XR) is arranged to effectively support augmented reality (AR), virtual reality (VR), mixed reality (MR), etc., to improve 5G performance and reduce complexity by utilizing artificial intelligence (AI) and machine learning (ML), AI service support, meta-service support, and drone communication.

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

[0008] Technical issues

[0009] The present disclosure proposes a method for effectively configuring a sounding reference signal (SRS). In addition, the present disclosure proposes a method for configuring SRS transmission by a UE so that an inactive UE can be more effectively located in a wireless communication system.

[0010] Technical Solution

[0011] According to an embodiment of the present disclosure, a method performed by a terminal in a wireless communication system is provided. The method includes: receiving a radio resource control (RRC) release message related to an RRC inactive state, the RRC release message including a sounding reference signal (SRS) configuration information for positioning provided in a pre-configured type; identifying an event that requires activation of the SRS configuration information for positioning; and sending an RRC recovery request message to a base station configured to operate a cell belonging to a valid area of ​​the SRS configuration information for positioning.

[0012] According to an embodiment of the present disclosure, a method performed by a base station in a wireless communication system is provided. The method includes: sending an RRC release message related to a radio resource control (RRC) inactive state, the RRC release message including a sounding reference signal (SRS) configuration information for positioning provided in a pre-configured type; and receiving an RRC recovery request message from the terminal in the event that an event requiring activation of the SRS configuration information for positioning occurs in the terminal, and in the event that the base station is configured to operate a cell belonging to a valid area of ​​the SRS configuration information for positioning.

[0013] According to an embodiment of the present disclosure, a terminal in a wireless communication system is provided. The terminal includes a transceiver and a controller coupled to the transceiver. The controller is configured to: receive an RRC release message related to a radio resource control (RRC) inactive state via the transceiver, the RRC release message including a sounding reference signal (SRS) configuration information for positioning provided in a pre-configured type; identify an event that requires activation of the SRS configuration information for positioning; and send an RRC recovery request message to a base station configured to operate a cell belonging to a valid area of ​​the SRS configuration information for positioning via the transceiver.

[0014] According to an embodiment of the present disclosure, a base station in a wireless communication system is provided. The base station includes a transceiver and a controller coupled to the transceiver. The controller is configured to: send an RRC release message related to a radio resource control (RRC) inactive state via the transceiver, the RRC release message including a sounding reference signal (SRS) configuration information for positioning provided in a pre-configured type; and in the case where an event occurs in a terminal that requires activation of the SRS configuration information for positioning, and in the case where the base station is configured to operate a cell belonging to a valid area regarding the SRS configuration information for positioning, receive an RRC recovery request message from the terminal via the transceiver.

[0015] Beneficial Effects

[0016] According to the embodiments of the present disclosure, the processing load and power consumption of the UE for locating the UE in the inactive state can be reduced. In addition, the transmission of the sounding reference signal by the UE can be effectively configured, so that the UE in the inactive state can be more effectively located.

[0017] Advantageous effects obtainable from the present disclosure may not be limited to the above-mentioned effects, and other effects not mentioned may be clearly understood from the following description by those skilled in the art to which the present disclosure pertains. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other aspects, features and advantages will become more apparent from the following description of embodiments of the present disclosure with reference to the accompanying drawings.

[0019] Figure 1 A structure of a next generation mobile communication system according to an embodiment of the present disclosure is shown.

[0020] Figure 2 A network structure according to an embodiment of the present disclosure is shown.

[0021] Figure 3 A process in which a UE configures a sounding reference signal (SRS) resource according to an embodiment of the present disclosure is shown.

[0022] Figure 4 A process in which a UE according to an embodiment of the present disclosure performs SRS transmission in an RRC_INACTIVE state is shown.

[0023] Figure 5 A process is shown in which a UE according to an embodiment of the present disclosure receives SRS configuration information in an RRC_CONNECTED state, activates one of the SRS configuration information in an RRC_INACTIVE state, and then transmits it.

[0024] Figure 6 A process in which a UE according to an embodiment of the present disclosure pre-receives SRS configuration information in an RRC_CONNECTED state is shown.

[0025] Figure 7 A process in which a UE according to an embodiment of the present disclosure activates SRS transmission in an RRC_INACTIVE state is shown.

[0026] Figure 8 A process is shown in which a gNB according to an embodiment of the present disclosure pre-generates SRS configuration information that can be used by a UE in an RRC_INACTIVE state.

[0027] Fig. 9 A process in which a gNB releases SRS configuration information pre-configured for a UE according to an embodiment of the present disclosure is shown.

[0028] Fig.10 is a block diagram showing an internal structure of a UE according to an embodiment of the present disclosure.

[0029] Fig.11 is a block diagram showing the structure of a base station according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0030] Hereinafter, the operating principle of the present disclosure will be described in detail in conjunction with the accompanying drawings. When describing the present disclosure below, when it is determined that the description may make the subject matter of the present disclosure unnecessarily unclear, the detailed description of the known functions or configurations incorporated herein will be omitted. The terms to be described below are terms defined in consideration of the functions in the present disclosure, and may differ according to the user, the user's intention or custom. Therefore, the definition of the terms should be based on the content of the entire specification. Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0031] For the same reason, in the accompanying drawings, some elements may be exaggerated, omitted or schematically shown. In addition, the size of each element does not fully reflect the actual size. In each of the accompanying drawings, the same or corresponding elements are marked with the same reference numerals.

[0032] By referring to the embodiments described in detail below in conjunction with the accompanying drawings, the advantages and features of the present disclosure and the ways to achieve them will be apparent. However, the present disclosure is not limited to the embodiments set forth below, but can be implemented in various different forms. The following embodiments are provided only to fully disclose the present disclosure and inform those skilled in the art of the scope of the present disclosure, and the present disclosure is limited only by the scope of the appended claims.

[0033] In this article, it will be understood that each box of the flowchart diagram and the combination of boxes in the flowchart diagram can be implemented by computer program instructions. 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 component for implementing the function specified in one or more flowchart boxes. These computer program instructions can also be stored in a computer-usable or computer-readable memory, wherein the computer-usable or computer-readable memory can instruct the computer or other programmable data processing device to act in a particular manner, so that the instructions stored in the computer-usable or computer-readable memory produce an article of instruction components including the functions specified in one or more flowchart boxes. The instructions executed on a computer or other programmable data processing device so that a series of operating steps will be performed on a computer or other programmable data processing device to generate a computer-implemented process can provide steps for implementing the functions specified in the flowchart box (or multiple).

[0034] In addition, each box in the flowchart diagram may represent a module, fragment or portion of a code, which includes one or more executable instructions for implementing a specified logical function (or multiple). It should also be noted that in some alternative embodiments, the functions mentioned in the box may not occur in order. For example, two boxes shown in succession can actually be executed substantially simultaneously, or the boxes can sometimes be executed in reverse order, depending on the functions involved.

[0035] As used in the embodiments of the present disclosure, the term "unit" indicates a software element or a hardware element, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC), and a "unit" can perform certain functions. However, a "unit" does not always have a meaning limited to software or hardware. A "unit" can be constructed to be stored in an addressable storage medium or to execute one or more processors. Therefore, a "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 a "unit" can be combined into a smaller number of elements or "units", or divided into a larger number of elements or "units". In addition, elements and "units" can be implemented to reproduce one or more CPUs in a device or a secure multimedia card. In addition, a "unit" in an embodiment can include one or more processors.

[0036] 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. Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0037] In the following description, for the sake of convenience of description, terms for identifying access nodes, terms indicating network entities, terms indicating messages, terms indicating interfaces between network entities, terms indicating various identification information, etc. are illustratively used. Therefore, the present disclosure is not limited to the terms described below, and other terms relating to subjects having equivalent technical meanings may also be used.

[0038] In the following description, for the convenience of description, terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) standard may be used. 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. In the present disclosure, for the convenience of description, the term "eNB" may be used interchangeably with the term "gNB". That is, a base station described as an "eNB" may indicate a "gNB".

[0039] 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. A 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. Of course, examples of base stations and terminals are not limited to those mentioned above.

[0040] In the following description of the embodiments of the present disclosure, LTE, LTE-A, LTE Pro or 5G (or NR, next generation mobile communication) systems will be described by way of example, but the embodiments of the present disclosure may be applied to other communication systems with similar backgrounds or channel types. In addition, based on the determination of those skilled in the art, the embodiments of the present disclosure may be applied to other communication systems with some modifications without significantly departing from the scope of the present disclosure.

[0041] 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. Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0042] Figure 1 A structure of a next generation mobile communication system according to an embodiment of the present disclosure is shown.

[0043] refer to Figure 1 As shown therein, the radio access network of the next generation mobile communication system (hereinafter referred to as NR or 5G) may include a next generation base station (new radio node B, hereinafter referred to as NR NB, gNB, NR gNB or NR base station) 1-10 and a new radio core network (NR CN) 1-05. Of course, the above example is not restrictive, and the radio access network of the next generation mobile communication system may include a greater number of entities than the entities in the above example. The user terminal (new radio user equipment, hereinafter referred to as NR UE or NR terminal) 1-15 can access an external network via NR gNB1-10 and NR CN1-05.

[0044] exist Figure 1In the present invention, NR gNB 1-10 corresponds to the evolved Node B (eNB) of the conventional LTE system. NRg NB1-10 is connected to NR UE 1-15 through radio channel 1-20, and can provide excellent services compared with the conventional Node B. In the next generation mobile communication system, since all user services are served through a shared channel, a device that collects status information such as the buffer status, available transmission power status, and channel status of the UE and performs scheduling accordingly is required, and NR gNB 1-10 serves as the device. Generally, one NR gNB 1-10 can control multiple cells.

[0045] According to an embodiment of the present disclosure, in order to achieve ultra-high-speed data transmission beyond the current LTE, the next-generation mobile communication system can provide a bandwidth wider than the existing maximum bandwidth, can adopt orthogonal frequency division multiplexing (hereinafter referred to as OFDM) as a radio access technology, and can further integrate beamforming technology with it. In addition, the next-generation mobile communication system can adopt an adaptive modulation & coding (hereinafter referred to as AMC) scheme for determining the modulation scheme and channel coding rate according to the channel state of the UE. NR CN 1-05 can perform functions such as mobility support, bearer configuration, and QoS configuration. NR CN 1-05 is a device responsible for various control functions of the UE and mobility management functions, and can be connected to multiple base stations. In addition, the next-generation mobile communication system can interoperate with the existing LTE system, and the NR CN 1-05 can be connected to the MME 1-25 via a network interface. The MME can be connected to the eNB 1-30 which is an existing base station.

[0046] Figure 2 A network structure according to an embodiment of the present disclosure is shown.

[0047] Specifically, Figure 2 A network structure for providing a UE positioning service in a next generation mobile communication system according to an embodiment of the present disclosure is shown. The term "UE positioning service" may be used interchangeably with the term "location service (LCS)" hereinafter.

[0048] refer to Figure 2 , a network for providing LCS in a next generation mobile communication system may include UE 2-01, NG-RAN node 2-02, access and mobility function (AMF) 2-03, and location management function (LMF) 2-04. UE 2-01 may communicate with LMF 2-04 through NG-RAN node 2-02 and AMF 2-03, and may exchange information necessary for locating the UE. AMF 2-03 and LMF 2-04 may be referred to as a single core network entity. In order to provide LCS, for example, the various entities may perform the following roles.

[0049] UE 2-01 may measure radio signals necessary for positioning the UE and may pass the measurement results to LMF 2-04.

[0050] The NG-RAN node 2-02 may transmit downlink radio signals necessary for positioning the UE and may measure uplink radio signals transmitted by the target UE.

[0051] AMF 2-03 may receive an LCS request message from an LCS requester, and may then pass the LCS request message to LMF 2-04, thereby requesting (or instructing) LMF 2-04 to provide UE location service. If LMF 2-04 processes the LCS (or positioning) request, and then sends (or responds to) a response message regarding the result of locating the UE to AMF 2-03, AMF 2-03 may pass the result of locating the UE to the LCS requester after receiving the response message (or response).

[0052] LMF 2-04 may include a device configured to receive an LCS request message from AMF 2-03 (with an LCS request message passed therefrom) and process the LCS request message, and may control the overall process necessary for positioning the UE. In order to locate the UE, LMF2-04 may provide the UE 2-01 with the auxiliary information necessary for positioning and signal measurement, and may obtain (or receive) the result value, and then the LTE Positioning Protocol (LPP) may be used as a protocol for data exchange. LPP may define message specifications for positioning services between UE 2-01 and LMF2-04. In addition, LMF 2-04 may also exchange positioning reference signal (hereinafter referred to as PRS) configuration information and sounding reference signal (hereinafter referred to as SRS) measurement results for positioning with NG-RAN node 2-02. NR Positioning Protocol A (NRPPa) may then be used as a protocol for data exchange, and NRPPa may define message specifications used between NG-RAN node 2-02 and LMF 2-04.

[0053] Figure 3 A process in which a UE configures a sounding reference signal (SRS) resource according to an embodiment of the present disclosure is shown.

[0054] Figure 3 A process is shown in which the LMF 3-04 configures the transmission of a sounding reference signal (SRS) required by the UE 3-01 to perform at least one of the UL positioning method or the DL+UL positioning method. For example, depending on the configuration and / or definition in the system, Figure 3 The steps shown in FIG. 1 are not necessarily all included, and some steps may be omitted.

[0055] The UL positioning method may indicate a scheme for positioning the UE based on an uplink signal transmitted by the UE. For example, the UL positioning method may include a scheme in which the UE transmits an SRS signal through an uplink, and the gNB / transmission reception point (TRP) receives (or measures) the SRS signal transmitted by the UE and acquires SRS measurement information (or a measurement result value), and the UE is positioned based on the SRS measurement information (or a measurement result value).

[0056] The DL+UL positioning method may indicate a scheme for positioning the UE based on a downlink signal sent by the gNB / TRP and an uplink signal sent by the UE. For example, the gNB / TRP may send a positioning reference signal (PRS) through a downlink. Upon receiving the PRS sent by the gNB / TRP, the UE may obtain PRS measurement information (or a measurement result value). For example, the UE may send an SRS signal through an uplink, and upon receiving (or measuring) the SRS signal sent by the UE, the gNB / TRP may obtain SRS measurement information (or a measurement result value). Thereafter, the PRS measurement information (or measurement result value) measured by the UE and the SRS measurement information (or measurement result value) measured by the gNB / TRP may be used together to locate the UE.

[0057] Therefore, in order to locate the UE by using at least one of the UL positioning method or the DL+UL positioning method, it is necessary to perform a process in which the UE is configured to transmit the SRS. Hereinafter, a process performed in a corresponding step will be described.

[0058] In step 3-05, LMF 3-04 may exchange NRPPa TRP configuration information with serving gNB / TRP 3-02 and neighbor gNB / TRP 3-03. (NRPPa TRP configuration information exchange)

[0059] The LMF 3-04 may obtain information necessary for performing the UL positioning method from the serving gNB / TRP 3-02 and the neighbor gNB / TRP 3-03. The information necessary for performing the UL positioning method may include at least one of NR cell information, PRS configuration, spatial direction information, and location information. In step 3-10, the UE capability information may be exchanged between the LMF 3-04 and the UE 3-01. (LPP Capability Transfer)

[0060] The LMF 3-04 may request the UE 3-02 to provide the UE's capability information related to positioning, and may then receive a response therefrom.

[0061] In step 3-15, LMF 3-04 may send an NRPPa positioning information request message to the serving gNB / TRP 3-02. (NRPPa positioning information request)

[0062] The NRPPa positioning information request message sent by the LMF 3-04 may include information for determining the SRS transmission resource configuration of the UE required for UL positioning based on information already collected by the LMF (e.g., location information of neighboring TRPs, existing location information of the UE, SSB / PRS transmission information of TRPs, etc.) and requesting the serving gNB / TRP 3-02 to provide such information. The message may include information about at least one of the number, period, path loss reference, and spatial relationship of necessary SRS resources.

[0063] In step 3-20, the serving gNB / TRP 3-02 may finally determine the SRS resources used by the UE to send the SRS. (gNB determines UL SRS resources)

[0064] After receiving the NRPPa positioning information request message from LMF 3-04, the serving gNB / TRP 3-02 can finally determine the SRS resources to be configured for the UE based on the received message.

[0065] In step 3-25, the serving gNB / TRP 3-02 may pass the SRS resource configuration information (or SRS resource transmission configuration information, UE SRS configuration) determined in step 3-20 to UE 3-01.

[0066] (UE SRS configuration)

[0067] The serving gNB / TRP 3-02 may pass the SRS resource configuration information to the UE 3-01 via RRC signaling.

[0068] In step 3-30, the serving gNB / TRP 3-02 may send an NRPPa Positioning Information Response message to the LMF 3-04. (NRPPa Positioning Information Response)

[0069] The NRPPa positioning information response message sent by the serving gNB / TRP 3-02 can be used by the serving gNB / TRP 3-02 to pass the SRS resource configuration information (e.g., the position, period, spatial relationship information, etc. of the SRS resource on the time / frequency axis) that is ultimately passed to the UE 3-01 in step 3-25 to the LMF.

[0070] In step 3-35, the LMF 3-04 may pass the NRPPa Positioning Activation Request message to the serving gNB / TRP 3-02. (NRPPa Positioning Activation Request)

[0071] In the case where UE 3-02 is configured to send semi-persistent SRS or non-periodic SRS, the NRPPa positioning activation request message can be used by LMF 3-04 to request the serving gNB / TRP 3-02 to activate SRS transmission of UE 3-01.

[0072] In step 3-40, the serving gNB / TRP 3-02 may configure the UE 3-01 to activate SRS transmission.

[0073] (Activate UE SRS transmission)

[0074] May include a process in which, after receiving the NRPPa positioning activation request message, the serving gNB / TRP 3-02 indicates SRS activation to the UE 3-40 via MACCE or DCI.

[0075] In step 3-45, the serving gNB / TRP 3-02 may send an NRPPa positioning activation response message to the UE 3-01. (NRPPA Positioning Activation Response)

[0076] The NRPPa positioning activation response message as a response to the NRPPa positioning activation request message can be used by the serving gNB / TRP 3-02 to convey to the LMF 3-04 information about whether the SRS activation is completed (or indicate whether the SRS activation is completed).

[0077] In step 3-55, LMF 3-04 may send a NRPPa measurement request message. (NRPPa measurement request)

[0078] The NRPPa measurement request message may be used by the LMF 3-04 to deliver the request for SRS measurement and result reporting sent by the UE to the serving gNB / TRP 3-02 and the neighbor gNB / TRP 3-03. The NRPPa measurement request message may also include SRS resource information configured for the UE 3-01.

[0079] In step 3-60, the serving gNB / TRP 3-02 and the neighbor gNB / TRP 3-03 may measure the SRS transmitted by the UE 3-01. (UL SRS Measurement)

[0080] After receiving the SRS measurement request from LMF 3-04 through the NRPPa measurement request message, the serving gNB / TRP 3-02 and the neighbor gNB / TRP 3-03 can measure the SRS sent by UE3-01 based on the SRS configuration information included in the NRPPa measurement request message.

[0081] In step 3-65, the serving gNB / TRP 3-02 and the neighbor gNB / TRP 3-03 may send a NRPPa measurement response message to the LMF 3-04. (NRPPa Measurement Response)

[0082] The NRPPa measurement response message can be used by the serving gNB / TRP 3-02 and the neighbor gNB / TRP 3-03 that have received the SRS measurement request from the LMF 3-04 in step 3-55 described above to pass the SRS measurement results to the LMF 3-04.

[0083] In step 3-70, LMF 3-04 may send an NRPPa positioning deactivation message to the serving gNB / TRP 3-02. (NRPPa positioning deactivation)

[0084] The NRPPa positioning deactivation message may be sent by the LMF 3-04 to the serving gNB / TRP 3-02 in order to deactivate the SRS transmission requested in step 3-35 after completion of the positioning technical operation.

[0085] Figure 4 A process in which a UE according to an embodiment of the present disclosure performs SRS transmission in an RRC_INACTIVE state is shown.

[0086] Figure 4 1 shows a process in which, when an event has occurred requesting the UE to perform SRS transmission in the RRC_INACTIVE state, the UE reports the event to the LMF, receives the SRS transmission configuration, and performs SRS transmission. For example, depending on the configuration and / or definition in the system, Figure 4 The steps shown in FIG. 1 are not necessarily all included, and some steps may be omitted.

[0087] In step 410, the network may configure events that require SRS transmission to be performed by the UE. For example, steps 1 to 21 of TS 23.273 clause 6.3.1 regarding postponing 5GC mobile terminated positioning request (5GC-MT-LR) associated with periodic or triggered positioning events may be performed. The LMF may perform one or more positioning procedures in step 15 of TS 23.273 clause 6.3.1 to request and obtain UE positioning capabilities, or may provide necessary support data to the target device. The LCS periodic triggered positioning call in step 16 of TS 23.273 clause 6.3.1 may include an embedded LPP request positioning information message that is allowed for each reported positioning event, or that indicates necessary positioning measurements / SRS transmission. The UE may be released from RRC_CONNECTED to RRC_INACTIVE via an RRCRelease including a SuspendConfig sent by the last serving gNB.

[0088] In step 4-12, the UE may monitor the occurrence of the trigger or periodic event requested in step 4-10.

[0089] In step 4-15, the UE may send a UL Information Transfer message including an uplink NAS transmission to the gNB together with the RRC Recovery Request message. The uplink NAS transmission may include event report information.

[0090] For example, if the event is detected (or immediately before the event is detected), the UE may use a small data transfer (SDT) to send an RRC UL Information Transfer message including an uplink NAS transfer message together with an RRC recovery request. The UE may include the LCS event report in the payload container of the UL NAS transfer message and may include the deferred route identifier received in step 4-10 in the additional information of the UL NAS transfer message as defined in TS24.501.

[0091] The gNB that has received the message in steps 4-15 may be the same as or different from the last serving gNB when the UE was released to RRC_INACTIVE state.

[0092] In step 4-17, the gNB may send an LCS event report message to the LMF.

[0093] For example, the gNB (receiving gNB) that has received the message in step 4-15 may send the LCS event report together with the LPP request assistance data message included in the NGAP uplink NAS transport message to the serving AMF. The AMF may determine the LMF from the deferred route identifier received in the additional information IE of the UL NAS transport message, and may trigger the Namf_Communication_N1MessageNotify service operation so that the LCS event report is delivered to the LMF together with the embedded LPP message. The AMF may also have a related identifier set by and included in the payload container type and the deferred route identifier.

[0094] If the anchor gNB does not change from the last serving gNB to the receiving gNB, the LCS event report can be transferred from the receiving gNB to the last serving gNB via RRCTRANSFER, where RRC TRANSFER is an XnAP message as in TS 38.423. In addition, subsequent downlink / uplink messages can also be transferred from the last serving gNB to the receiving gNB via RRC TRANSFER as an XnAP message.

[0095] In step 4-18, LMF may send an NRPPa positioning information request message to gNB.

[0096] For example, the LMF may send an NRPPa positioning information request message to the receiving gNB to request the UL-SRS regarding the target device.

[0097] In step 4-20, the gNB may determine the UL SRS resources.

[0098] For example, the receiving gNB may determine resources that can be used for UL-SRS.

[0099] In step 4-22, the gNB may send an NRPPa positioning information response message to the LMF.

[0100] For example, the receiving gNB may provide UL-SRS configuration information to the LMF by using the NRPPa Positioning Information Response message.

[0101] In step 4-25, the LMF may send an NRPPa measurement request message to the gNB.

[0102] For example, the LMF may send an NRPPa measurement request message including UL-SRS measurement configuration information to a group of gNBs.

[0103] In step 4-27, the LMF may send an LCS event report confirmation to the gNB. In step 4-30, the gNB may send a subsequent DL SDT including an event report confirmation to the UE.

[0104] For example, if the LMF sends an SS LCS event report confirmation to the receiving gNB, the receiving gNB can provide the SS event report confirmation to the UE through a subsequent DLSDT.

[0105] In step 4-33, the gNB may send an RRC release message including UL-SRS configuration information to the UE.

[0106] For example, the receiving gNB may send an RRC release message including the suspendConfig to the UE, thereby keeping the UE in the RRC_INACTIVE state. The RRC release message may include the UL-SRS configuration information.

[0107] In step 4-35, the UE may send UL-SRS. In step 4-37, the gNB / TRP may measure UL-SRS.

[0108] For example, the UE may perform UL-SRS transmission and each configured TRP may perform UL-SRS measurement.

[0109] In step 4-40, the gNB may send an NRPPa measurement response message to the LMF.

[0110] For example, after performing UL-SRS measurement, the gNB (or multiple gNBs) that have received the message in step 4-25 may provide the UL measurement results to the LMF via an NRPPa measurement response message.

[0111] In step 4-43, the remaining operations of postponing the 5GC-MT-LR process can be performed.

[0112] For example, steps 28 to 31 as specified in TS 23.273 clause 6.3.1 regarding postponing the 5GC-MT-LR procedure associated with periodic or triggered positioning events may be performed.

[0113] When performing a small data transmission (SDT) operation for SRS configuration reception and transmission activation in the RRC_INACTIVE state through the above-described process, the UE 4-01 needs to consume a power amount similar to that in the RRC_CONNECTED state at least during a time period 4-34 from step 4-15 to step 4-33. Figure 5 , Figure 6 , Figure 7 and Figure 8The described embodiments of the present disclosure propose a method and apparatus in which the time for a UE in an RRC_INACTIVE state to perform an SDT operation for SRS transmission configuration and activation is reduced, thereby reducing the power consumed by the UE in a positioning process and the positioning delay time.

[0114] Figure 5 A process is shown in which a UE according to an embodiment of the present disclosure receives SRS configuration information in an RRC CONNECTED state, activates one of the SRS configuration information in an RRC_INACTIVE state, and then transmits it.

[0115] refer to Figure 5 , showing the process in which UE 5-01 pre-receives SRS configuration information in the RRC_CONNECTED state and then activates the configured SRS transmission in a short time through minimum signaling in the RRC_INACTIVE state. For example, depending on the configuration and / or definition in the system, Figure 5 The steps shown in FIG. 1 are not necessarily all included, and some steps may be omitted.

[0116] In step 5-10, the UE 5-01 in the RRC_CONNECTED state may receive SRS configuration information in advance (e.g., configuration information necessary to perform SRS transmission in the RRC_INACTIVE state). To this end, the LMF 5-07 may request the gNB 5-03 or 5-04 to pre-configure the UE with SRS, and the gNB may determine the SRS pre-configuration for the UE based on the request of the LMF. Figure 8 The detailed process of gNB determining SRS preconfiguration for UE is described in more detail in the embodiment of FIG. Thereafter, gNB may transmit the determined SRS preconfiguration to UE through RRC signaling. Figure 6 The embodiments in more detail describe the process of delivering SRS preconfiguration to UE through RRC signaling and multiple information included in the SRS preconfiguration.

[0117] In step 5-13, the LMF may instruct the UE in advance to start SRS transmission when a specific event (eg, a periodically repeated event) occurs. In step 5-13, the UE may detect the occurrence of the specific event indicated by the LMF.

[0118] In step 5-15, if a specific event for starting SRS transmission has occurred in step 5-13, the UE may initiate a signaling procedure for activating one or more SRS resources (e.g., SRS resource sets) included in the SRS preconfiguration received in advance in step 5-10. The UE may request the gNB 5-03 to activate the SRS resources, and the gNB may instruct the UE to activate one or more SRS resources included in the SRS preconfiguration. Figure 7 The detailed process for activating SRS transmission is described in more detail with reference to the embodiments in the accompanying drawings.

[0119] In addition, if the UE has moved over time, the gNB 5-04 that has configured the SRS preconfiguration for the UE in step 5-10 and the gNB 5-03 that has been requested to activate the SRS resources in step 5-15 may be different. In this case, the gNB 5-03 that has been requested to activate the SRS resources may perform a process of requesting (5-17) the gNB 5-04 that has configured the SRS preconfiguration for the UE to provide a UE context including the SRS preconfiguration in order to ensure configuration information about the SRS resources to be activated, and receiving (5-18) the UE context in response thereto.

[0120] In step 5-20, the gNB 5-03 may instruct the UE 5-01 to activate the SRS resources (in other words, to perform SRS transmission by using specific SRS resources) in step 5-15, and may then report the activated SRS resource information (e.g., SRS resource set ID or SRS resource ID) to the LMF 5-07 via an NRPPa message.

[0121] In step 5-22, after receiving the activated SRS resource information from the gNB 5-03 in step 5-20, the LMF 5-07 may identify the target NG-RAN (gNB or TRP) 5-03 that should receive and measure the SRS resources. The LMF may send an NRPPa message to the NG-RAN to instruct them to receive and measure the SRS sent by the UE 5-01. The NRPPa message may include configuration information of the SRS to be received by the NG-RAN.

[0122] In steps 5-25 and 5-27, UE 5-01 may perform SRS transmission by using the SRS resources activated in step 5-15. NG-RAN (gNB or TRP) 5-03 may receive and measure the SRS transmitted by the UE.

[0123] In step 5-30, NG-RAN (gNB or TRP) 5-03 may report the SRS measurement results to the LMF as instructed by LMF 5-07 in step 5-22.

[0124] While performing a small data transmission (SDT) operation for SRS transmission activation in the RRC_INACTIVE state through the above-described process, the UE 5-01 needs to consume a power amount similar to that in the RRC_CONNECTED state during a period 5-16 in which the signaling process in step 5-15 is performed. The UE may pre-receive configuration information for SRS transmission in the RRC_INACTIVE state in step 5-10, and may activate the pre-configured SRS resources through relatively simple signaling in step 5-15, thereby activating the SRS resources in the RRC_INACTIVE state. Figure 4 Compared with the time 4-34 in the RRC_INACTIVE state, the time 5-16 required to perform SDT in the RRC_INACTIVE state for SRS transmission configuration and activation is reduced. Therefore, the UE can reduce the power consumed by positioning in RRC_INACTIVE and the positioning delay time by using SRS pre-configuration.

[0125] Figure 6 A process in which a UE according to an embodiment of the present disclosure pre-receives SRS configuration information in an RRC_CONNECTED state is shown.

[0126] refer to Figure 6 , showing a process in which the gNB 6-03 provides configuration information for SRS transmission (hereinafter, referred to as SRS pre-configuration) to the UE 6-01 in the RRC_INACTIVE state in advance (in other words, before the UE transitions to the RRC_INACTIVE state). The process may correspond to Figure 5 Steps 5-10 of the embodiment. For example, depending on the configuration and / or definition in the system, Figure 6 The steps shown in FIG. 1 are not necessarily all included, and some steps may be omitted.

[0127] The gNB may deliver UE-specific (in other words, applied only to a specific UE) SRS preconfiguration to the UE via RRCReconfiguration (case 1-1) 6-10 and RRCRelease (case 1-2) 6-20 messages. In addition, the gNB may broadcast SRS preconfiguration common to all UEs in a specific cell (in other words, generally applied to all UEs in a specific cell) via SIB (case 2) 6-30 messages.

[0128] The SRS pre-configuration may include one or more SRS configuration information parameters (e.g., SRS-PosResource, SRS-PosResourceSet, or SRS-PosConfig). Each piece of SRS configuration information may be associated with a single cell or multiple cells. If the SRS configuration information is associated with a single cell, this may mean that the SRS configuration information is only valid (available) in the corresponding cell. If the SRS configuration information is associated with multiple cells, this may mean that the SRS configuration information is only valid (available) in the corresponding multiple cells. If the SRS configuration information is associated with multiple cells, the cell may be indicated in a list type (for this purpose, at least one of the NR cell global ID, PCI, and NR-ARFCN value of each cell may be included in the list). In addition, a list of multiple cells may be defined as a valid area for the SRS configuration information.

[0129] The SRS configuration information (eg, SRS-PosResource, SRS-PosResourceSet, or SRS-PosConfig) may include at least one of the following parameters or a combination thereof, respectively.

[0130]

[0131] In addition, if the SRS configuration information is connected to multiple cells, parameters that can be commonly used in multiple cells among the above parameters (for example, parameters other than pathlossReferenceRS-Pos and spatialRelationInfoPos) can be commonly configured instead of redundantly configured for the corresponding cells in order to reduce the signaling load. On the other hand, parameters that can have different values ​​configured for the corresponding cells (for example, pathlossReferenceRS-Pos and spatialRelationInfoPos) can have separate values ​​configured for the corresponding cells. Alternatively, parameters that can have different values ​​configured for the corresponding cells (for example, pathlossReferenceRS-Pos and spatialRelationInfoPos) may not be configured within the SRS preconfiguration, but may be configured together when the SRS transmission resources are activated later in the RRC_INACTIVE state. For reference, the parameter pathlossReferencer-Pos indicates a reference signal used to adjust the transmission power when the SRS is transmitted to locate the UE, and can be mainly configured as a downlink reference signal transmitted by the UE's serving gNB. Therefore, considering the situation that the serving cell changes due to the movement of the UE, it may be necessary to configure the parameter pathlossReferenceRS-Pos for each cell.

[0132] Figure 7 A process in which a UE according to an embodiment of the present disclosure activates SRS transmission in an RRC_INACTIVE state is shown.

[0133] refer to Figure 7 , showing a process in which a UE that has received SRS pre-configuration activates SRS transmission resources in response to the occurrence of an event requiring SRS transmission for positioning. For example, depending on the configuration and / or definition in the system, Figure 7 The steps shown in FIG. 1 are not necessarily all included, and some steps may be omitted.

[0134] In step 7-10, UE 7-01 may receive SRS preconfiguration in advance from gNB 7-03 (e.g., before sending SRS for positioning in the RRC_INACTIVE state).

[0135] Thereafter, if an event occurs in step 7-15 that requires SRS transmission for positioning in the RRC_INACTIVE state, the UE may trigger a process for activating one or more SRS transmission resources (e.g., SRS-PosResource or SRS-PosResourceSet) currently valid in the UE's serving cell among the SRS resources included in the previously received SRS preconfiguration.

[0136] In order to activate the SRS transmission resource, a method using at least one of the following three options 7-20, 7-30, and 7-40 or a combination thereof may be applied.

[0137] Option 1 7-20: UE 7-01 reports the index value (srs-PosResourceId or srs-PosResourceSetId) of the SRS transmission resource (SRS-PosResource or SRS-PosResourceSet) to be activated to gNB 7-03 by using an RRC message or MAC CE.

[0138] In step 7-22, in order to send an RRC message or MAC CE requesting activation of SRS transmission resources to the gNB, the UE may send an RRCResumeRequest message, thereby starting a small data transfer (SDT) procedure. The UE may then perform uplink and downlink transmissions similar to the RRC_CONNECTED state. To this end, the UE may receive gNB scheduling information (e.g., DCI) while monitoring the PDCCH channel. In addition, the RRCResumeRequest message may include an identifier of the UE (e.g., ShortI-RNTI-Value) together. The gNB may identify the UE that has started the RRC recovery procedure for SRS transmission resource activation through the corresponding identifier, and if necessary, may request another gNB (e.g., a gNB from which the UE has received SRS preconfiguration) to provide the UE context of the UE by using the corresponding identifier.

[0139] In step 7-24, the UE may send an RRC message or MAC CE for requesting activation of an SRS transmission resource to the gNB. The UE may select a transmission resource that is currently valid in the UE's serving cell from among the SRS transmission resources included in the SRS preconfiguration received in step 7-10. If there is one SRS transmission resource that is currently valid in the serving cell, the UE may include only the index value of the corresponding SRS transmission resource in message 7-24, or may only request activation of the SRS transmission resource without including the index of the SRS transmission resource. Even if the message does not include the index of the SRS transmission resource, the gNB may know that the UE has requested activation of the corresponding resource because there is only one SRS transmission resource that is currently valid in the UE's serving cell. On the other hand, if there are multiple SRS transmission resources that are currently valid in the serving cell, the UE may select one of the multiple valid SRS transmission resources and may include the index value of the corresponding SRS transmission resource in message 7-24, or may include a list of index values ​​of multiple SRS transmission resources in message 7-24. If the UE includes the index values ​​of the multiple SRS transmission resources in the message 7-24, the priority among the multiple SRS transmission resources (in other words, the UE's preference for the multiple SRS transmission resources) may be indicated by the order in the list. For example, the UE may include the index values ​​of the multiple SRS transmission resources in the list in descending order of the activation request priority of the UE (in other words, the UE's preference for the multiple SRS transmission resources). In addition, if the index value list of the multiple SRS transmission resources is included in the message 7-24, the UE may also include therein the number of SRS transmission resources that need to be activated.

[0140] In step 7-26, the gNB 7-03 may activate one or more SRS transmission resources in the SRS transmission resources that the UE 7-01 has requested to be activated in step 7-24. The gNB may indicate the index values ​​of the one or more SRS transmission resources to be activated to the UE through the RRCRelease message or the MAC CE. If the UE has passed the index values ​​of multiple SRS transmission resources to the gNB in ​​step 7-24, the index values ​​of one or more SRS transmission resources may be included in the message 7-26, thereby activating the corresponding SRS transmission resources. On the other hand, if the UE has passed only one SRS transmission resource index to the gNB in ​​step 7-24, one SRS transmission resource index value may be included in the message 7-26, thereby activating the corresponding SRS transmission resource. In another scheme, the message 7-26 may not include a separate SRS transmission resource index value. In this case, the gNB may include only an indicator approving the content that has been requested by the UE in step 7-24 in the message 7-26, thereby indicating that the SRS transmission resource that has been requested to be activated in step 7-24 is activated.

[0141] In addition, as referenced Figure 6 In the embodiment of the present invention, message 7-26 may also include parameters (e.g., pathlossReferenceRS-Pos and spatialRelationInfoPos) in the SRS transmission configuration that may have different values ​​configured for each cell. In other words, additional configuration information (e.g., pathlossReferenceRS-Pos and spatialRelationInfoPos) may be included for each SRS transmission resource (SRS-PosResource or SRS-PosResourceSet) to be activated.

[0142] In step 7-50, the gNB may report to the LMF 7-07 the index value and specific configuration information of the SRS transmission resources that have been indicated to be activated to the UE 7-01. Although omitted in this embodiment, the LMF may thereafter instruct the gNB and the TRP to measure the corresponding SRS transmission resources for UE positioning based on the information reported in step 7-50.

[0143] In step 7-55, the UE may activate transmission on the SRS transmission resources that have been indicated to be activated by the gNB in ​​step 7-26. Figure 6In the embodiment of , if UE-specific (in other words, only applied to a specific UE) SRS pre-configuration has been delivered to the UE through the RRCReconfiguration (case 1-1) 6-10 and RRCRelease (case 1-2) 6-20 messages, this may mean that the SRS transmission resources configured in the corresponding SRS pre-configuration have been configured for the UE alone. In this case, the UE may start transmission on the corresponding SRS transmission resource in step 7-55 immediately after reporting the index value of one of the multiple SRS transmission resources to be activated to the gNB in ​​step 7-24, without the activation instruction of the gNB in ​​step 7-26.

[0144] Option 2 7-30: UE 7-01 sends a preamble connected to a specific SRS transmission resource (SRS-PosResource or SRS-PosResourceSet), thereby requesting gNB 7-03 to activate the corresponding SRS transmission resource.

[0145] In steps 7-10, the UE may Figure 6In one of the schemes 6-13, 6-25 and 6-35 described in the embodiments of the present invention, configuration information (SRS pre-configuration) necessary for SRS transmission for positioning in the RRC_INACTIVE state is received from the gNB. If UE-specific (in other words, only applied to a specific UE) SRS pre-configuration is configured for the UE through the RRCReconfiguration (case 1-1) 6-10 and RRCRelease (case 1-2) 6-20 messages, the SRS pre-configuration may also include a contention-free random access (CFRA) resource configuration (e.g., RACH-ConfigDedicated) to be used for SRS transmission resource activation. In addition, each SRS transmission resource included in the SRS pre-configuration may be connected to a dedicated preamble resource to be used to activate the corresponding SRS transmission resource. In other words, each SRS transmission resource may have a dedicated preamble resource configured for this purpose to activate the corresponding resource. Alternatively, the dedicated preamble resource may be configured so that the UE can use the dedicated preamble resource to request activation of the SRS transmission resource. On the other hand, if an SRS preconfiguration that is common to all UEs in a cell (in other words, commonly applied to all UEs in a specific cell) is broadcast through a (pos)SIB (Case 2) 6-35 message, a contention-based random access (CBRA) resource configuration (e.g., RACH-ConfigCommon) to be used for SRS transmission resource activation may be configured together. In addition, each SRS transmission resource included in the SRS preconfiguration may be connected to a preamble resource to be used to activate the corresponding SRS transmission resource. In other words, each SRS transmission resource may have a specific preamble resource configured therefor for activating the corresponding resource.

[0146] In step 7-32, in order to request activation of a specific SRS transmission resource, the UE may send a (dedicated) preamble connected to the corresponding SRS transmission resource, thereby starting a random access procedure. More specifically, the UE may select a transmission resource that is currently valid in the UE's serving cell among the SRS transmission resources included in the SRS preconfiguration received in step 7-10. If there is one SRS transmission resource that is currently valid in the serving cell, the UE may start a random access procedure by using a (dedicated) preamble resource connected to the corresponding SRS transmission resource. On the other hand, if there are multiple SRS transmission resources that are currently valid in the serving cell, the UE may select one of the multiple valid SRS transmission resources and may start a random access procedure by using a (dedicated) preamble resource connected to the corresponding SRS transmission resource. Alternatively, if only one valid SRS transmission resource that is currently valid in the serving cell has been configured in step 7-10, the UE may start a random access procedure by using a dedicated preamble resource configured for the UE, so that it can be used to request activation of any SRS transmission resource other than a specific SRS transmission resource.

[0147] If the UE needs to activate multiple SRS transmission resources, the UE may repeatedly perform processes 7-32, 7-34, 7-36, and 7-38 necessary to activate the corresponding SRS transmission resources.

[0148] In step 7-34, the gNB may transmit a RAR message in response to the preamble received in step 7-32. If the UE has transmitted a dedicated preamble connected to a specific SRS transmission resource by using a CFRA resource (e.g., RACH-ConfigDedicated) in step 7-32, the UE may interpret the RAR message corresponding to the preamble transmission as an instruction to activate the corresponding SRS transmission resource, and then may activate the corresponding SRS transmission resource. Alternatively, if only one valid SRS transmission resource has been configured for each cell in step 7-10, and if the configured dedicated preamble has been transmitted to the UE in step 7-32 so that the UE can request activation of the SRS transmission resource by using the CFRA resource, the UE may interpret the RAR message corresponding to the preamble transmission as an instruction to activate a single SRS transmission resource currently valid in the serving cell, and then may activate the corresponding SRS transmission resource. This operation of interpreting the RAR message as an instruction for activating SRS transmission resources is possible because if the UE has already transmitted a dedicated preamble connected to a specific SRS transmission resource by using a CFRA resource, the gNB is able to identify the UE simultaneously with receiving the corresponding preamble in the corresponding CFRA transmission resource (in other words, because no additional contention resolution process is necessary). On the other hand, if the UE has already transmitted a preamble connected to a specific SRS transmission resource by using a CFRA resource (e.g., RACH-ConfigCommon) in step 7-32, even after receiving the RAR in step 7-34, the following processes 7-36 and 7-38 need to be performed to complete the contention resolution process.

[0149] In step 7-36, the UE may send an RRCResumeRequest message for contention resolution by using the MSG3 transmission resources (UL grant) included in the RAR message received in step 7-34. A new value (e.g., SRS-activation) may be defined and included as a resumption cause to indicate that the corresponding RRCResume procedure has been triggered for SRS transmission resource activation. The RRCResumeRequest message may additionally include an identifier of the UE (e.g., ShortI-RNTI-Value). The gNB may identify the UE that has started the random access procedure for SRS transmission resource activation by the corresponding identifier, and, if necessary, may request another gNB (e.g., a gNB from which the UE has received SRS preconfiguration) to provide the UE context of the UE by using the corresponding identifier.

[0150] In step 7-38, the UE may receive Msg4 from the gNB, thereby receiving an SRS transmission resource activation instruction. More specifically, the gNB may identify the SRS transmission resource for which activation has been requested based on the preamble received in step 7-32. In addition, the gNB may identify the UE for which SRS transmission resource activation has been requested by a UE identifier (e.g., ShortI-RNTI-Value) included in the RRCResumeRequest message received in step 7-36. Thereafter, the gNB may send MSG4 including the following multiple pieces of information in step 7-38, thereby indicating that the SRS transmission resource for which the UE has requested activation through preamble transmission in step 7-32 is activated.

[0151] -UE Contention Resolution Identifier MAC CE: The MAC CE included in the UL CCCH SDU (in other words, the RRCResumeRequest message) sent by the UE in step 7-36 may be included for contention resolution. If the gNB that has received the preamble sent by the UE in step 7-32 is the same as the gNB that has delivered the RRC Release message to indicate the transition to the RRC_INACTIVE state, the gNB may send a DCI scrambled by the C-RNTI value previously used by the UE, thereby performing contention resolution. In this case, the UE Contention Resolution Identifier MAC CE may not be included in the Msg4 received in step 7-38.

[0152] -SRS Activation MAC CE: A MAC CE for SRS transmission resource activation may be included. Therefore, the gNB may include the index value (srs-PosResourceId or srs-PosResourceSetId) of the SRS transmission resource that has been requested to be activated by the UE in step 7-32 in the corresponding MAC CE, thereby indicating that the corresponding SRS transmission resource is activated. Alternatively, the gNB may not include a separate SRS transmission resource index in the corresponding MAC CE. In this case, the corresponding MAC CE may be interpreted as a confirmation of the SRS transmission resource activation request in step 7-32. Alternatively, the gNB may not include a separate MAC CE in MSG4 for the purpose of SRS transmission resource activation. In this case, the UE may interpret any kind of Msg4 message that enables contention resolution as a message confirming that the SRS transmission resource that has been requested to be activated in step 7-32 is activated.

[0153] -RRCRelease message: The gNB can recognize that the UE has started the RRC recovery procedure for SRS transmission resource activation through the recovery cause value in the RRCResumeRequest message received in step 7-36. Therefore, the gNB can send Msg4 7-38 including the RRCRelease message without a separate additional operation, thereby transitioning the UE back to the RRC_INACTIVE state. The gNB can include the index value (srs-PosResourceId or srs-PosResourceSetId) of the SRS transmission resource that has been requested to be activated by the UE in step 7-32 in the RRCRelease message, thereby indicating the activation of the corresponding SRS transmission resource.

[0154] In step 7-50, the gNB may report to the LMF 7-07 the index value and specific configuration information of the SRS transmission resources that have been indicated to be activated to the UE 7-01. Although omitted in this embodiment, the LMF may thereafter instruct the gNB and the TRP to measure the corresponding SRS transmission resources for positioning of the UE based on the information reported in step 7-50.

[0155] In step 7-55, the UE may perform SRS transmission according to the instruction from the gNB in ​​step 7-34 or 7-38 to activate the SRS transmission resources that have been requested to be activated in step 7-32.

[0156] If the above Option 2 is used, the UE does not have to perform operations similar to the RRC_CONNECTED state for the purpose of SDT operation in the RRC_INACTIVE state, and thus the power consumption of the UE can be reduced compared to the above Option 1 and the subsequent Option 3.

[0157] Option 3 7-40: UE 7-01 requests gNB 7-03 to activate SRS transmission resources for positioning through RRCResumeRequest message.

[0158] In step 7-42, the UE may deliver a RRCResumeRequest message to request activation of SRS transmission resources. A new value (e.g., SRS-activation) may be defined and included in the RRCResumeRequest message as a resumption cause for indicating that the RRCResume procedure has been triggered for SRS transmission resource activation. The RRCResumeRequest message may additionally include an identifier of the UE (e.g., ShortI-RNTI-Value). The gNB may identify the UE that has started the RRC resumption procedure for SRS transmission resource activation through the corresponding identifier, and, if necessary, may request another gNB (e.g., a gNB from which the UE has received SRS preconfiguration) to provide the UE context of the UE by using the corresponding identifier. After receiving a request for SRS transmission resource activation for positioning from the UE through the RRCResumeRequest message, the gNB may determine to activate one or more of the SRS transmission resources included in the SRS preconfiguration delivered to the UE in step 7-10.

[0159] In step 7-45, the gNB 7-03 may activate one or more of the SRS transmission resources included in the SRS preconfiguration delivered to the UE 7-01 in step 7-10. The gNB may indicate the index value of the one or more SRS transmission resources to be activated to the UE through a RRCRelease message or a MAC CE. In addition, the gNB may transition the UE back to the RRC_INACTIVE state by sending a RRCRelease message to the UE. More specifically, the gNB may identify the corresponding RRC recovery procedure for SRS transmission resource activation based on the recovery cause value in the RRCResumeRequest message sent by the UE in step 7-42. Therefore, the gNB may transition the UE back to the RRC_INACTIVE state through the RRCRelease message without a separate additional operation.

[0160] In addition, as referenced Figure 6As described in the embodiment of , if the parameters (e.g., pathlossReferenceRS-Pos and spatialRelationInfoPos) in the SRS transmission configuration that can have different values ​​configured for each cell are not included in the SRS pre-configuration in step 7-10, the corresponding parameters can be included together in message 7-45. In other words, additional configuration information (e.g., pathlossReferenceRS-Pos and spatialRelationInfoPos) can be included with respect to each SRS transmission resource (SRS-PosResource or SRS-PosResourceSet) to be activated.

[0161] In step 7-50, the gNB may report to the LMF 7-07 the index value and specific configuration information of the SRS transmission resources that have been indicated to be activated to the UE 7-01. Although omitted in this embodiment, the LMF may thereafter instruct the gNB and the TRP to measure the corresponding SRS transmission resources for positioning of the UE based on the information reported in step 7-50.

[0162] In step 7-55, the UE may perform transmission of the SRS transmission resources that have been instructed to be activated by the gNB in ​​step 7-45.

[0163] Figure 8 A process is shown in which a gNB according to an embodiment of the present disclosure pre-generates SRS configuration information that can be used by a UE in an RRC_INACTIVE state.

[0164] refer to Figure 8 , the serving gNB 8-03 may collaborate with the neighbor gNB 8-05 and the LMF 8-09 to pre-generate SRS configuration information that can be used by the UE 8-01 in the RRC INACTIVE state. The serving gNB may generate the SRS pre-configuration by the following step-by-step process. For example, depending on the configuration and / or definition in the system, Figure 8 The steps shown in FIG. 1 are not necessarily all included, and some steps may be omitted.

[0165] (Steps 8-10) TRP configuration information exchange:

[0166] LMF 8-09 may perform a process of receiving information about TRP for positioning services from gNB 8-03 and 8-05 (e.g., NR gNB or LTE eNB), and may send and / or receive messages necessary for the process of information about TRP for positioning services through AMF 8-07.

[0167] (Step 8-13) LPP Capability Transmission:

[0168] LMF 8-09 may request the positioning capability information of the UE through the LPP capability transfer process with UE 8-01, and may receive the positioning capability information from the UE.

[0169] The serving gNB may determine the SRS preconfiguration 8-27 and 8-37 by using at least one of the following two schemes:

[0170] (8-20) Option 1: LMF 8-09 requests the serving gNB to provide SRS pre-configuration, and the serving gNB again requests the neighbor gNB 8-05 to provide SRS pre-configuration.

[0171] (8-21) NRPPa location information request:

[0172] If the LMF 8-09 determines that a positioning service method using an uplink sounding reference signal (SRS) is used in the UE 8-01 and then wants to start the related process, the LMF may send an NRPPa positioning information request message to the serving gNB of the UE through the AMF 8-07 in step 8-21. The NRPPa positioning information request message may include at least one of the requested SRS transmission characteristics information and the requested SRS transmission characteristics for the pre-configuration information as a pre-configuration of the SRS configuration information to be used by the UE in the RRC_INACTIVE state (hereinafter referred to as SRS pre-configuration). The NRPPa positioning information request message may be configured as in the example in Table 1 below:

[0173] [Table 1]

[0174]

[0175]

[0176] If the NRPPa positioning information request message includes requested SRS transmission SRS characteristic information to request SRS pre-configuration, the requested SRS transmission SRS characteristic (A.1) may be configured as in the example in Table 2 below:

[0177] [Table 2]

[0178]

[0179]

[0180]

[0181] An indicator (preconfiguration indication) may be included to indicate that the requested SRS transmission SRS characteristic information is for SRS preconfiguration. In addition, when requesting the service to provide SRS preconfiguration, the LMF may request not only the corresponding service gNB but also other neighbor gNBs to provide valid SRS preconfiguration. To this end, each piece of SRS resource set item information in the requested SRS transmission SRS characteristic information may be included to request the preconfiguration of SRS transmission configuration information that the UE can use in each cell (or gNB), and the NR CGI information (A.3) may be included together to indicate in which cell (gNB) SRS preconfiguration is requested by each piece of SRS resource set item information, as shown in the example in Table 3 below:

[0182] [Table 3]

[0183]

[0184] On the other hand, if the NRPPa positioning information request message includes the requested SRS transmission SRS characteristics for pre-configuration information requesting SRS pre-configuration, the requested SRS transmission SRS characteristics for pre-configuration information (A.2) may be configured as in the example in Table 4 below:

[0185] [Table 4]

[0186]

[0187]

[0188] When requesting the serving gNB to provide SRS preconfiguration, the LMF may request not only the corresponding serving gNB but also other neighbor gNBs to provide valid SRS preconfiguration. To this end, the requested SRS transmission characteristics for preconfiguration information may include one or more requested SRS transmission characteristics for preconfiguration set item information, and each requested SRS transmission characteristics for a preconfiguration set item may include a requested SRS transmission characteristics for preconfiguration information, for requesting SRS preconfiguration information in a specific cell (or gNB) indicated by NG-CGI. In this case, the requested SRS transmission characteristics for preconfiguration (A.1) information may not include the preconfiguration indication and NR-CGI information.

[0189] (8-23)Xn SRS pre-configuration request:

[0190] When a request for SRS preconfiguration regarding a specific UE 8-01 is received from the LMF 8-09 through the NRPPa positioning information request message in step 8-21, the serving gNB 8-03 may determine that the SRS transmission resources to be included in the SRS preconfiguration are configured for the UE to perform positioning services based on the requested SRS transmission characteristics (for preconfiguration) information included in the NRPPa message 8-21. More specifically, the serving gNB may determine the SRS transmission resources that can be preconfigured for SRS transmission of UEs in the cell operated by the corresponding gNB. In addition, if a request for SRS preconfiguration in a cell operated by other neighbor gNBs 8-05 is received from the LMF together through the NRPPa message 8-21, the serving gNB may request the corresponding neighbor gNB to provide SRS preconfiguration. To this end, the serving gNB may send an Xn SRS preconfiguration request message to the neighbor gNB through the Xn interface. The Xn SRS preconfiguration request message may be configured as in the example in Table 5 below:

[0191] [Table 5]

[0192]

[0193]

[0194] The Xn SRS preconfiguration request message may include a requested SRS transmission characteristic (A.2) for preconfiguration information for requesting SRS preconfiguration information in a cell operated by a neighbor gNB 8-05. The information included in the requested SRS transmission characteristic for preconfiguration information (A.2) has been described above with respect to step 8-21. In addition, after determining the SRS transmission resources that can be preconfigured for SRS transmission of UEs in a cell operated by the corresponding gNB, the serving gNB may include the same content as the SRS configuration (B.1) information in the Xn SRS preconfiguration request message. When determining the preconfigured SRS information for UE 8-01 according to the request of the serving gNB 8-03, the neighbor gNB 8-05 may refer to the SRS configuration (B.1) information. The SRS configuration (B.1) information may be defined as in the example in Table 6 below:

[0195] [Table 6]

[0196]

[0197]

[0198]

[0199] (8-25)Xn SRS pre-configuration response:

[0200] The neighbor gNB 8-05 that has been requested to provide SRS preconfiguration in step 8-23 may determine the SRS transmission resources to be preconfigured based on the information in the Xn SRS preconfiguration request message. Thereafter, the preconfigured SRS configuration information may be included in an Xn SRS preconfiguration response message and then sent to the serving gNB as a response. The preconfigured SRS configuration information may be included in the Xn SRS preconfiguration response, as shown in the example in Table 7 below:

[0201] [Table 7]

[0202]

[0203] If the neighbor gNB 8-05 that has been requested to provide SRS preconfiguration in step 8-23 cannot determine the SRS transmission resources to be preconfigured based on the information in the Xn SRS preconfiguration request message, it can notify the serving gNB 8-03 that the preconfigured SRS transmission resources cannot be allocated according to the request through an Xn SRS preconfiguration failure message. The Xn SRS preconfiguration failure message can be defined as in the embodiment of Table 8 below:

[0204] [Table 8]

[0205]

[0206] (8-27)UE SRS configuration:

[0207] The serving gNB 8-03 may configure a plurality of preconfigured SRS configurations for the UE so that the UE 8-01 later performs SRS transmission in the RRC_INACTIVE state for the purpose of positioning service. The UE SRS configuration may include SRS transmission resources determined to be preconfigured for SRS transmission of the UE in the cell operated by the corresponding gNB based on the information included in the NRPPa positioning information request received by the serving gNB in ​​step 8-21, and SRS transmission resources included in the preconfigured SRS configuration information received in response from the neighbor gNB in ​​step 8-25. Reference has been made above to Figure 6 The embodiments in describe a detailed method in which a serving gNB configures a UE SRS configuration including multiple preconfigured SRS configurations and transmits it to the UE.

[0208] (8-29) NRPPa positioning information response:

[0209] The serving gNB 8-03 may send an NRPPa positioning information response message in response to the NRPPa positioning information request message received from the LMF 8-09 in step 8-21. In response to the request for SRS preconfiguration received in step 8-21, the serving gNB may include the SRS preconfiguration information that has been configured for the UE 8-01 in step 8-27 in the NRPPa positioning information response message as preconfigured SRS configuration list information, as in the example in Table 9 below:

[0210] [Table 9]

[0211]

[0212]

[0213] The preconfigured SRS configuration list (C.1) information included in the NRPPa positioning information response may include one or more preconfigured SRS configuration information (preconfigured SRS transmission resource information), and each SRS transmission resource may be valid in the cell indicated by the NR-CGI information. The preconfigured SRS configuration list (C.1) information may be defined as in the example in Table 10 below:

[0214] [Table 10]

[0215]

[0216] (8-30) Option 2: LMF 8-09 requests the neighbor gNB 8-05 to provide SRS preconfiguration and delivers the result to the serving gNB 8-03.

[0217] (8-31) NRPPa location information request:

[0218] LMF 8-09 may request the serving gNB 8-03 and the neighbor gNB 8-05 to provide pre-configuration of SRS transmission resources, which can be used by the UE 8-01 for SRS transmission in the RRC_INACTIVE state. To this end, the LMF 8-09 may send an NRPPa positioning information request to the serving gNB 8-03 and the neighbor gNB 8-05. For reference, the serving gNB may be requested to provide SRS pre-configuration (described below) by an NRPPa positioning information request message sent by the LMF in step 8-35. In this case, the LMF may omit the transmission of the NRPPa positioning information request message regarding the serving gNB in ​​step 8-31. The NRPPa positioning information request message may include at least one of the requested SRS transmission characteristic information and the requested SRS transmission characteristics for the pre-configuration information as a pre-configuration of the SRS configuration information to be used by the UE in the RRC_INACTIVE state (hereinafter referred to as SRS pre-configuration). The NRPPa positioning information request message may be configured as in the example in Table 11 below:

[0219] [Table 11]

[0220]

[0221] If the NRPPa positioning information request message includes requested SRS transmission SRS characteristic information in order to request SRS pre-configuration, the requested SRS transmission SRS characteristic (A.1a) may be configured as in the example in Table 12 below:

[0222] [Table 12]

[0223]

[0224]

[0225]

[0226] An indicator (preconfiguration indication) may be included to indicate that the requested SRS transmission SRS characteristic information is for SRS preconfiguration.

[0227] On the other hand, if the NRPPa positioning information request message includes the requested SRS transmission SRS characteristics for preconfiguration information to request SRS preconfiguration, the requested SRS transmission characteristics for the preconfiguration information may be configured as (A.1a) above. In this case, the presence of the requested SRS transmission SRS characteristics for the preconfiguration information itself means a preconfiguration request, and thus an indicator (preconfiguration indication) may not be included to indicate a request for SRS preconfiguration.

[0228] (8-33) NRPPa positioning information response:

[0229] The serving gNB 8-03 and the neighbor gNB 8-05 may determine the preconfigured SRS configuration to be configured for the positioning service for the UE 8-01 based on the information in the NRPPa positioning information request message received from the LMF 8-09 in step 8-31. More specifically, the serving gNB and the neighbor gNB may determine the SRS transmission resources that can be preconfigured for SRS transmission of the UE in the cell operated by the corresponding gNB, may include the same content as the preconfigured SRS configuration information in the NRPPa positioning information response, and may send it to the LMF. The NRPPa positioning information response may be configured as in the example in Table 13 below:

[0230] [Table 13]

[0231]

[0232] The pre-configured SRS configuration information (B.1) may be configured as shown in the example in Table 14 below: [Table 14]

[0233]

[0234]

[0235]

[0236] (8-35) NRPPa location information request:

[0237] In step 8-33, for the purpose of positioning service, LMF 8-09 may request the serving gNB 8-03 to perform SRS preconfiguration for UE 8-01. To this end, the LMF may send an NRPPa positioning information request message to the serving gNB. The LMF may include the preconfigured SRS configuration information collected from the corresponding gNB in ​​step 8-33 in the NRPPa positioning information request message as preconfigured SRS configuration list information. In addition, if the LMF has not requested the serving gNB to provide SRS preconfiguration in step 8-31, the LMF may include the requested SRS transmission characteristic information in the NRPPa positioning information request message so as to request the serving gNB to provide SRS preconfiguration in step 8-35. The NRPPa positioning information request message may be configured as in the example in Table 15 below:

[0238] [Table 15]

[0239]

[0240]

[0241] The preconfigured SRS configuration list (C.1) information included in the NRPPa positioning information response may include one or more preconfigured SRS configuration information (preconfigured SRS transmission resource information), and each SRS transmission resource may be valid in the cell indicated by the NR-CGI information. The preconfigured SRS configuration list (C.1) information may be configured as shown in the example in Table 16 below:

[0242] [Table 16]

[0243]

[0244]

[0245] (8-37)UE SRS configuration:

[0246] The serving gNB 8-03 may configure a plurality of preconfigured SRS configurations for the UE so that the UE 8-01 may later perform SRS transmission in the RRC_INACTIVE state for positioning services. The UE SRS configuration may include SRS transmission resources that are determined to be preconfigured for SRS transmission of the UE in the cell operated by the corresponding gNB based on the information included in the NRPPa positioning information request received by the serving gNB in ​​step 8-35, and SRS transmission resources included in the preconfigured SRS configuration information delivered from the LMF in step 8-35. Reference has been made to the above Figure 6 The embodiments in describe a detailed method for the serving gNB to configure UE SRS configuration information and pass it to the UE.

[0247] (8-39) NRPPa positioning information response:

[0248] The serving gNB 8-03 may send an NRPPa positioning information response message in response to the NRPPa positioning information request message received from the LMF 8-09 in step 8-35. In response to the request for SRS preconfiguration received in step 8-35, the serving gNB may include the SRS preconfiguration information that has been configured for the UE 8-01 in step 8-37 as preconfigured SRS configuration information in the NRPPa positioning information response message, as in the example in Table 17 below:

[0249] [Table 17]

[0250]

[0251]

[0252] The pre-configured SRS configuration information (B.1) may be configured as shown in the example in Table 18 below: [Table 18]

[0253]

[0254]

[0255]

[0256] Fig. 9 A process in which a gNB releases SRS configuration information pre-configured for a UE according to an embodiment of the present disclosure is shown.

[0257] The serving gNB 9-03 may determine to release the pre-configured SRS configuration that has been configured for UE 9-01 for the purpose of positioning services. Fig. 9 It is shown that if the serving gNB 9-03 wants to release the Figure 5 Steps 5-10 and / or Figure 8 In the embodiment of the present invention, if the preconfigured SRS configuration is configured by the UE, the gNB 9-05 that retains the SRS transmission resources included in the preconfigured SRS configuration is instructed to release the SRS transmission resources. Fig. 9 In the embodiment of the present invention, it is possible to solve the problem because even if the serving gNB has instructed the UE to release the preconfigured SRS configuration, other gNBs 9-05 do not needlessly reserve SRS transmission resources. For example, depending on the configuration and / or definition in the system, Fig. 9 The steps shown in FIG. 1 are not necessarily all included, and some steps may be omitted.

[0258] (9-10) Pre-configure UL SRS resources for positioning services:

[0259] For the purpose of positioning services, the serving gNB 9-03 may pre-configure multiple pre-configured SRS configurations required for SRS transmission performed by the UE 9-01 in the RRC_INACTIVE state, such as Figure 8 In other words, the serving gNB may preconfigure multiple SRS transmission resources for the UE.

[0260] (9-15) gNB determines to release the pre-configured UL SRS resources:

[0261] The serving gNB may determine to release all or some of the multiple preconfigured SRS configurations configured for the UE in step 9-10. The gNB may autonomously determine to release the preconfigured SRS configurations in order to efficiently use uplink transmission resources. In addition, although omitted in this embodiment, the UE or LMF 9-09 may request the serving gNB to release the corresponding preconfigured SRS configuration.

[0262] If the serving gNB 9-03 can determine to release all or some of the multiple preconfigured SRS configurations configured for the UE 9-01, it needs to be able to instruct other gNBs that retain SRS transmission resources corresponding to the preconfigured SRS configurations to release the preconfigured SRS configurations. To this end, at least one of the following two options can be used as a specific method.

[0263] (9-20) Option 1: The serving gNB 9-03 instructs the neighbor gNB 9-05 to release the preconfigured SRS configuration through the Xn interface.

[0264] (9-21)XnSRS pre-configuration release indication:

[0265] The serving gNB may send an Xn SRS pre-configuration release indication message to the neighbor gNB 9-05 via the Xn interface, thereby indicating the release of all or some of the multiple pre-configured SRS configurations configured for the UE in step 9-10. The Xn SRS pre-configuration release indication message may be configured as shown in the example in Table 19 below:

[0266] [Table 19]

[0267]

[0268] The serving gNB may include the preconfigured SRS configuration to be released in the Xn SRS preconfiguration release indication message as preconfigured SRS release list information. The preconfigured SRS release list information (D, 1) may be configured as in the example in Table 20 below:

[0269] [Table 20]

[0270]

[0271] (9-25)UE SRS configuration:

[0272] If the serving gNB has decided to release all or some of the multiple pre-configured SRS configurations configured for the UE in steps 9-15, the serving gNB may configure changed UE SRS configuration information for the UE.

[0273] (9-27) NRPPa location information update:

[0274] If the serving gNB has decided to release all or some of the multiple preconfigured SRS configurations configured for the UE in step 9-15, the serving gNB may report the released preconfigured SRS configuration to the LMF. To this end, the released preconfigured SRS configuration may be included in the NRPPa Positioning Information Update message as preconfigured SRS release list information. The NRPPa Positioning Information Update message may be configured as in the example in Table 21 below:

[0275] [Table 21]

[0276]

[0277]

[0278] The pre-configured SRS release list information (D.1) may be configured as shown in the example in Table 22 below:

[0279] [Table 22]

[0280]

[0281] (9-30) Option 2: The serving gNB 9-03 instructs the LMF 9-09 to release the preconfigured SRS configuration, and the LMF again instructs the neighbor gNB 9-05 to release the preconfigured SRS configuration.

[0282] (9-31) NRPPa location information update:

[0283] If the serving gNB has decided to release all or some of the multiple preconfigured SRS configurations configured for the UE in step 9-15, the serving gNB may instruct the LMF to release the preconfigured SRS configurations. To this end, the preconfigured SRS configurations to be released may be included in the NRPPa Positioning Information Update message as preconfigured SRS release list information. The NRPPa Positioning Information Update message may be configured as in the example in Table 23 below:

[0284] [Table 23]

[0285]

[0286] The pre-configured SRS release list information (D.1) may be configured as shown in the example in Table 24 below:

[0287] [Table 24]

[0288]

[0289]

[0290] (9-35) NRPPa positioning pre-configuration release indication Xn SRS pre-configuration release indication:

[0291] The LMF may perform a process of releasing the preconfigured SRS configuration included in the preconfigured SRS release list in the NRPPa positioning information update message received from the serving gNB in ​​step 9-31. To this end, the LMF may send an NRPPa positioning preconfiguration release indication message to the relevant gNB that retains the preconfigured SRS configuration (the release has been indicated by the serving gNB in ​​step 9-31), thereby indicating the release of the preconfigured SRS configuration. To this end, the preconfigured SRS configuration to be released may be included in the NRPPa positioning preconfiguration release indication message as preconfigured SRS release list information, as in the example in Table 25 below: [Table 25]

[0292]

[0293] The pre-configured SRS release list information (D.1) may be configured as shown in the example in Table 26 below:

[0294] [Table 26]

[0295]

[0296]

[0297] (9-37)UE SRS configuration:

[0298] If the serving gNB has decided to release all or some of the multiple pre-configured SRS configurations configured for the UE in steps 9-15, the serving gNB may configure changed UE SRS configuration information for the UE.

[0299] Fig.10 is a block diagram showing an internal structure of a UE according to an embodiment of the present disclosure.

[0300] refer to Fig.10 , the UE may include a radio frequency (RF) processor 10-10, a baseband processor 10-20, a storage unit 10-30, and a controller 10-40.

[0301] The RF processor 10-10 may perform functions for transmitting / receiving signals through a radio channel, such as signal band conversion and amplification. That is, the RF processor 10-10 may up-convert a baseband signal provided from the baseband processor 10-20 into an RF band signal, may transmit it through an antenna, and may down-convert an RF band signal received through an antenna into a baseband signal. For example, the RF processor 10-10 may include a transmitting filter, a receiving filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), and the like. Although in Fig.10Only one antenna is shown in the figure, but the UE may include multiple antennas. In addition, the RF processor 10-10 may include multiple RF chains. In addition, the RF processor 10-10 may perform beamforming. For beamforming, the RF processor 10-10 may adjust the phase and amplitude of the signal sent / received through multiple antennas or antenna elements, respectively. In addition, the RF processor may perform MIMO and may receive multiple layers when performing MIMO operations.

[0302] The baseband processor 10-20 can perform the function of converting between the baseband signal and the bit string according to the physical layer specification of the system. For example, during data transmission, the baseband processor 10-20 can encode and modulate the transmitted bit string to generate complex symbols. In addition, during data reception, the baseband processor 10-20 can demodulate and decode the baseband signal provided from the RF processor 10-10 to recover the received bit string. For example, when following the orthogonal frequency division multiplexing (OFDM) scheme, during data transmission, the baseband processor 10-20 can encode and modulate the transmitted bit string to generate complex symbols, map the complex symbols to subcarriers, and configure OFDM symbols through inverse fast Fourier transform (IFFT) operations and cyclic prefix (CP) insertion. In addition, during data reception, the baseband processor 10-20 can separate the baseband signal provided from the RF processor 10-10 at the OFDM symbol level, can recover the signal mapped to the subcarrier through a fast Fourier transform (FFT) operation, and can recover the received bit string through demodulation and decoding.

[0303] As described above, the baseband processor 10-20 and the RF processor 10-10 can send and receive signals. Therefore, the baseband processor 10-20 and the RF processor 10-10 can be referred to as a transmitter, a receiver, a transceiver or a communication unit. In addition, at least one of the baseband processor 10-20 and the RF processor 10-10 may include a plurality of communication modules to support a variety of different radio access technologies. In addition, at least one of the baseband processor 10-20 and the RF processor 10-10 may include different communication modules to process signals in different frequency bands. For example, different radio access technologies may include wireless LAN (e.g., IEEE 802.11), cellular networks (e.g., LTE), etc. In addition, different frequency bands may include ultra-high frequency (SHF) (e.g., 2.1NRHz, NRHz) bands and millimeter wave (e.g., 60GHz) bands.

[0304] The storage unit 10-30 may store data such as basic programs, applications, and configuration information for the operation of the UE. Specifically, the storage unit 10-30 may store information about a second access node configured to perform wireless communication by using a second radio access technology. In addition, the storage unit 10-30 may provide stored data according to a request from the controller 10-40.

[0305] The controller 10-40 may control the overall operation of the UE. For example, the controller 10-40 may send / receive signals through the baseband processor 10-20 and the RF processor 10-10. In addition, the controller 10-40 may record and read data in the storage unit 10-40. To this end, the controller 10-40 may include at least one processor. For example, the controller 10-40 may include a communication processor (CP) configured to perform control for communication, and an application processor (AP) configured to control an upper layer such as an application.

[0306] Fig.11 is a block diagram showing the structure of a gNB according to an embodiment of the present disclosure.

[0307] refer to Fig.11 , the gNB may include an RF processor 11-10, a baseband processor 11-20, a backhaul communication unit 11-30, a storage unit 11-40, and a controller 11-50.

[0308] The RF processor 11-10 may perform functions for transmitting / receiving signals through a radio channel, such as signal band conversion and amplification. That is, the RF processor 11-10 may up-convert a baseband signal provided from the baseband processor 11-20 into an RF band signal, may transmit it through an antenna, and may down-convert an RF band signal received through an antenna into a baseband signal. For example, the RF processor 11-10 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, and an ADC. Although in Fig.11 Only one antenna is shown in the figure, but the first access node may include multiple antennas. In addition, the RF processor 11-10 may include multiple RF chains. In addition, the RF processor 11-10 may perform beamforming. For beamforming, the RF processor 11-10 may adjust the phase and amplitude of the signal sent / received through multiple antennas or antenna elements, respectively. The RF processor may send one or more layers to perform downward MIMO operation.

[0309] The baseband processor 11-20 can perform the function of conversion between the baseband signal and the bit string according to the physical layer specification of the first radio access technology. For example, during data transmission, the baseband processor 11-20 can encode and modulate the transmitted bit string to generate a complex symbol. In addition, during data reception, the baseband processor 11-20 can demodulate and decode the baseband signal provided from the RF processor 11-10 to recover the received bit string. For example, when following the OFDM scheme, during data transmission, the baseband processor 11-20 can encode and modulate the transmitted bit string to generate a complex symbol, map the complex symbol to a subcarrier, and configure the OFDM symbol by IFFT operation and CP insertion. In addition, during data reception, the baseband processor 11-20 can separate the baseband signal provided from the RF processor 11-10 at the OFDM symbol level, can recover the signal mapped to the subcarrier by FFT operation, and can recover the received bit string by demodulation and decoding. As described above, the baseband processor 11-20 and the RF processor 11-10 transmit and receive signals. Therefore, the baseband processor 11-20 and the RF processor 11-10 may be referred to as a transmitter, a receiver, a transceiver, or a communication unit.

[0310] The backhaul communication unit 11-30 may provide an interface for communicating with other nodes in the network. That is, the backhaul communication unit 11-30 may convert a bit string sent from the master gNB to other nodes (e.g., a secondary gNB, a core network) into a physical signal, and may convert a physical signal received from other nodes into a bit string.

[0311] The storage unit 11-40 may store data such as basic programs, applications, and configuration information for the operation of the master gNB. Specifically, the storage unit 11-40 may store information about bearers allocated to connected UEs, measurement results reported from connected UEs, and the like. In addition, the storage unit 11-40 may store information used as a reference for determining whether to provide multiple connections to the UE or to suspend them. In addition, the storage unit 11-40 may provide the stored data at the request of the controller 11-50.

[0312] The controller 11-50 controls the overall operation of the master gNB. For example, the controller 11-50 sends / receives signals through the baseband processor 11-20 and the RF processor 11-10 or through the backhaul communication unit 11-30. In addition, the controller 11-50 records and reads data in the storage unit 11-40. To this end, the controller 11-50 may include at least one processor.

[0313] The embodiments of the present disclosure described and shown in the specification and the drawings are merely specific examples that have been presented to easily explain the technical content of the present disclosure and help understand the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it is obvious to those skilled in the art that other variations based on the technical ideas of the present disclosure can be achieved. In addition, the above-mentioned various embodiments can be adopted in combination according to necessity.

[0314] 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 set forth herein, but should be limited by the appended claims and their equivalents.

[0315] The message names and IE names included in the detailed description of the present disclosure are merely examples, and other names having the same functions may be used as the message and IE names.

Claims

1. A method performed by a terminal in a wireless communication system, the method comprising: receiving a radio resource control (RRC) release message associated with an RRC inactive state, the RRC release message including sounding reference signal (SRS) configuration information for positioning provided in a pre-configured type; Identify events that require activation of SRS configuration information for positioning; as well as An RRC resumption request message is transmitted to a base station configured to operate a cell belonging to a valid area of ​​the SRS configuration information for positioning.

2. The method according to claim 1, wherein: The RRC resumption request message includes resumption cause information indicating that activation of the SRS for positioning is requested.

3. The method according to claim 1, wherein: The SRS configuration information for positioning includes resource information for SRS transmission, and Therein, the valid area is configured based on a list of cell identifiers for which the SRS configuration information for positioning is valid.

4. The method according to claim 1, wherein: Events are identified based on a configured time period or location of the trigger.

5. A method performed by a base station in a wireless communication system, the method comprising: sending a radio resource control (RRC) release message associated with an RRC inactive state, the RRC release message including a sounding reference signal (SRS) configuration information for positioning provided in a pre-configured type; as well as In case an event requiring activation of the SRS configuration information for positioning occurs in the terminal, and in case the base station is configured to operate a cell belonging to a valid area of ​​the SRS configuration information for positioning, an RRC resumption request message is received from the terminal.

6. The method according to claim 5, wherein: The RRC resumption request message includes resumption cause information indicating that activation of the SRS for positioning is requested.

7. The method according to claim 5, wherein: The SRS configuration information for positioning includes resource information for SRS transmission, and Therein, the valid area is configured based on a list of cell identifiers for which the SRS configuration information for positioning is valid.

8. The method according to claim 5, wherein: Events occur based on a configured time period or triggered location.

9. A terminal in a wireless communication system, the terminal comprising: Transceiver; as well as a controller, coupled to the transceiver, The controller is configured as follows: receiving, via a transceiver, a radio resource control (RRC) release message associated with an RRC inactive state, the RRC release message including sounding reference signal (SRS) configuration information for positioning provided in a preconfigured type; identifying an event requiring activation of SRS configuration information for positioning; and An RRC resumption request message is transmitted via the transceiver to a base station configured to operate a cell belonging to a valid area of ​​the SRS configuration information for positioning.

10. The terminal according to claim 9, wherein: The RRC resumption request message includes resumption cause information indicating that activation of the SRS for positioning is requested.

11. The terminal according to claim 9, wherein: The SRS configuration information for positioning includes resource information for SRS transmission, and Therein, the valid area is configured based on a list of cell identifiers for which the SRS configuration information for positioning is valid.

12. The terminal according to claim 9, wherein: Events are identified based on a configured time period or location of the trigger.

13. A base station in a wireless communication system, the base station comprising: Transceiver; as well as a controller coupled to the transceiver, The controller is configured as follows: sending, via the transceiver, a radio resource control (RRC) release message associated with an RRC inactive state, the RRC release message including sounding reference signal (SRS) configuration information for positioning provided in a preconfigured type; and In case an event occurs in the terminal that requires activation of the SRS configuration information for positioning, and in case the base station is configured to operate a cell belonging to a valid area regarding the SRS configuration information for positioning, an RRC resumption request message is received from the terminal via the transceiver.

14. The base station according to claim 13, wherein: The RRC resumption request message includes resumption cause information indicating that activation of the SRS for positioning is requested.

15. The base station according to claim 13, wherein: The SRS configuration information used for positioning includes resource information used for SRS transmission. wherein the validity area is configured based on a list of cell identifiers for which the SRS configuration information for positioning is valid, and Among them, events occur based on configured time periods or triggered locations.

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