Patent Publication Number: US-2023148189-A1

Title: Apparatus and method for providing low-latency location information service in wireless communication system

Description:
TECHNICAL FIELD 
     The disclosure relates to a wireless communication system and, more particularly, to a method and an apparatus for providing a low-latency location information service in a wireless communication. 
     BACKGROUND ART 
     To meet the demand for wireless data traffic having increased since deployment of 4G communication systems, efforts have been made to develop an improved 5G or pre-5G communication system. Therefore, the 5G or pre-5G communication system is also called a “beyond 4G network” communication system or a “post LTE” system. 
     The 5G communication system is considered to be implemented in ultrahigh frequency (mmWave) bands (e.g., 60 GHz bands) so as to accomplish higher data rates. To decrease propagation loss of the radio waves and increase the transmission distance in the ultrahigh frequency bands, beamforming, massive multiple-input multiple-output (massive MIMO), full dimensional MIMO (FD-MIMO), array antenna, analog beam forming, large scale antenna techniques are discussed in 5G communication systems. 
     In addition, in 5G communication systems, development for system network improvement is under way based on advanced small cells, cloud radio access networks (cloud RANs), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, moving network, cooperative communication, coordinated multi-points (CoMP), reception-end interference cancellation and the like. 
     In the 5G system, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) as an advanced coding modulation (ACM), and filter bank multi carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) as an advanced access technology have also been developed. 
     DISCLOSURE OF INVENTION 
     Technical Problem 
     Based on the above-mentioned discussion, the disclosure provides a method and apparatus for providing a low-latency location information service in a wireless communication system. 
     Solution to Problem 
     According to various embodiments of the disclosure, an operation method of an access and mobility function (AMF) is provided. The method may include an operation of receiving, from a user equipment (UE), a UE-originated location information request (mobile originated location request) message including first location quality of service (QoS) information, an operation of receiving a UE-terminated location information request (mobile terminated location request) message including second location QoS information from a gateway mobile location center (GMLC) or a network exposure function (NEF), an operation of determining updating of a UE configuration (UE configuration update) based on the first location QoS information and second location QoS information, an operation of transmitting a UE configuration update command message to the UE, and an operation of transmitting, to a base station (radio access network (RAN)) related to the UE, a RAN update (update RAN) message, in response to reception of a UE configuration update complete message. 
     According to various embodiments of the disclosure, an apparatus of an access and mobility function (AMF) in a wireless communication system is provided. The apparatus includes a transceiver and at least one processor. The at least one processor is configured to receive, from a user equipment (UE), a UE-originated location information request (mobile originated location request) message including first location quality of service (QoS) information, to receive a UE-terminated location information request (mobile terminated location request) message including second location QoS information from a gateway mobile location center (GMLC) or a network exposure function (NEF), to determine updating of UE configuration based on the first location QoS information and the second location QoS information, to transmit a UE configuration update command message to the UE, and to transmit, to a base station (radio access network (RAN)) related to the UE, a RAN update (update RAN) message in response to reception of a UE configuration update complete message. 
     Advantageous Effects of Invention 
     A method and apparatus according to various embodiments of the disclosure may provide a method and apparatus for providing a low-latency location information service in a wireless communication system. 
     Advantageous effects obtainable from the disclosure may not be limited to the above mentioned effects, and other effects which are not mentioned may be clearly understood, through the following descriptions, by those skilled in the art to which the disclosure pertains. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a diagram illustrating an example of a 5G system architecture using expression of a reference point in a wireless communication system. 
         FIG.  2    is a diagram illustrating the configuration of a network entity in a wireless communication system according to various embodiments of the disclosure. 
         FIG.  3    is a diagram illustrating a network structure (including an LMF) that provides a core network location information service and an interface in a wireless communication system according to various embodiments of the disclosure. 
         FIG.  4    is a diagram illustrating a network structure (including an LMC) that provides a RAN-based location information service and an interface in a wireless communication system according to various embodiments of the disclosure. 
         FIG.  5    is a diagram illustrating a system structure wherein an LMC and an LMF coexist in a wireless communication system according to various embodiments of the disclosure. 
         FIGS.  6 A and  6 B  are diagrams illustrating a response time in association with a location information service (positioning service) in the case in which a UE is in a connected state or the UE is in an idle state in a wireless communication system. 
         FIG.  7    is a diagram illustrating a response time in association with a location information service (positioning service) in the case in which a UE is in an idle state in a wireless communication system according to various embodiments of the disclosure. 
         FIG.  8    is a diagram illustrating a process of re-configuration a DRX cycle of a UE in a wireless communication system according to various embodiments of the disclosure. 
         FIG.  9    is a diagram illustrating a process of performing a UE configuration update procedure after performing a UE positioning procedure in a wireless communication system according to various embodiments of the disclosure. 
         FIG.  10    is a diagram illustrating a process of performing a UE configuration update procedure after performing a location information service using an LMF in a location information service structure including an LMF in a wireless communication system according to various embodiments of the disclosure. 
         FIG.  11    is a diagram illustrating a process in which an AMF requests RRC re-configuration in the case in which an RRC inactive state is applied to a RAN in a wireless communication system according to various embodiments of the disclosure. 
         FIG.  12    is a diagram illustrating a process of restoring an existing DRX cycle to an original value after successfully completing a UE location information service in a wireless communication system according to various embodiments of the disclosure. 
         FIG.  13    is a diagram illustrating a process in which an AMF updates a DRX parameter according to movement of a UE in a wireless communication system according to various embodiments of the disclosure. 
     
    
    
     BEST MODE FOR CARRYING OUT THE INVENTION 
     The terms used in the disclosure are only used to describe specific embodiments, and are not intended to limit the disclosure. A singular expression may include a plural expression unless they are definitely different in a context. Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as those commonly understood by a person skilled in the art to which the disclosure pertains. Such terms as those defined in a generally used dictionary may be interpreted to have the meanings equal to the contextual meanings in the relevant field of art, and are not to be interpreted to have ideal or excessively formal meanings unless clearly defined in the disclosure. In some cases, even the term defined in the disclosure should not be interpreted to exclude embodiments of the disclosure. 
     Hereinafter, various embodiments of the disclosure will be described based on an approach of hardware. However, various embodiments of the disclosure include a technology that uses both hardware and software, and thus the various embodiments of the disclosure may not exclude the perspective of software. 
     In the following description, terms referring to signals, terms referring to channels, terms referring to control information, terms referring to network entities, terms referring to device elements, and the like are illustratively used for the sake of convenience. Therefore, the disclosure is not limited by the terms as used below, and other terms referring to subjects having equivalent technical meanings may be used. 
     In the following description, terms for identifying access nodes, terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, terms referring to various identification information, and the like are illustratively used for the sake of convenience. Therefore, the disclosure is not limited by the terms as used below, and other terms referring to subjects having equivalent technical meanings may be used. 
     Further, in the following description of the disclosure, various embodiments will be described using terms and names employed in some communication standards (e.g., 3rd generation partnership project (3GPP)) only for the sake of illustration. However, various embodiments of the disclosure may be easily applied to other communication systems through modifications. 
       FIG.  1    is a diagram illustrating an example of a 5G system architecture using expression of a reference point in a wireless communication system. 
     Referring to  FIG.  1   , the 5G system architecture may include various elements (i.e., network functions (NF)), and  FIG.  1    illustrates some of the various elements such as an authentication server function (AUSF), a (core) access and mobility management function (AMF), a session management function (SMF), a policy control function (PCF), an application function (AF), a unified data management (UDM), a data network (DN), a user plane function (UPF), a (radio) access network ((R)AN), and a terminal, that is, a user equipment (UE). 
     Each NF may support a function as follows.
         The AUSF stores data for authenticating a UE.   The AMF provides an access and mobility management function based on a UE unit, and a single AMF may be basically accessed by a single UE.       

     Specifically, the AMF may support functions such as signaling between CN nodes for mobility among 3GPP access networks, termination of a radio access network (RAN) CP interface (i.e., N2 interface), termination of a NAS signaling (N1), NAS signaling security (NAS ciphering and integrity protection), AS security control, registration management (registration area management), connection management, an idle mode UE reachability (including controlling and performing of paging retransmission), mobility management control (subscription and policy), supporting an intra-system mobility and inter-system mobility, supporting network slicing, selecting an SMF, lawful intercept (with respect to an AMF event and an interface to an L1 system), providing delivery of a session management (SM) message between a UE and an SMF, a transparent proxy for routing an SM message, access authentication, access authorization including checking of the right of roaming, providing delivery of an SMS message between a UE and an SMSF, a security anchor function (SAF), and/or security context management (SCM), and the like. 
     Some or all of the functions of an AMF may be supported in a single instance of a single AMF.
         The DN may be, for example, an operator service, an Internet access or 3 rd  parry service, or the like. The DN transmits a downlink protocol data unit (PDU) to a UPF, or receives, from the UPF, a PDU transmitted from a UE.   The PCF receives information associated with a packet flow from an application server, and provides a function of determining a policy associated with mobility management, session management, and the like. Particularly, the PCF supports functions such as supporting a unified policy framework to control network operations, providing policy rules so that a CP function(s) (e.g., an AMF, an SMF, and the like) implements the policy rules, implementing a front end for accessing related subscription information for determining a policy in a user data repository (UDR).   The SMF may provide a session management function, and in the case in which a UE has a plurality of sessions, the sessions may be managed by SMFs different from each other.       

     Specifically, the SMF supports functions such as session management (e.g., establishing, correcting, and releasing a session including maintaining a tunnel between a UPF and an AN node), allocating and managing a UE IP address (selectively including authentication), selecting and controlling a UP function, setting a traffic steering for routing traffic from a UPF to an appropriate destination, termination of an interface for policy control functions, performing the control part of a policy and quality of service (QoS), lawful intercept (with respect to an SM event and an interface to an L1 system), termination of an SM part of a NAS message, downlink data notification, an initiator of AN-specific SM information (transferring to an AN through N2 via an AMF), determining an SSC mode of a session, a roaming function, and the like. 
     Some or all of the functions of an SMF may be supported in a single instance of a single SMF.
         The UDM stores user subscription data, policy data, and the like. The UDM includes two parts, that is, an application front end (FE) and a user data repository (UDR).       

     The FE includes a UDM FE that is in charge of processing location management, subscription management, a credential, and the like, and includes a PCF that is in charge of policy control. The UDR stores data required for functions provided by the UDM-FE and stores a policy profile required by the PCF. The data stored in the UDR includes user subscription data including a subscription identifier, a security credential, access and mobility related subscription data, and session-related subscription data, and may include policy data. The UDM-FE supports functions such as accessing subscription information stored in the UDR, authentication credential processing, user identification handling, access authentication, registration/mobility management, subscription management, SMS management, and the like.
         The UPF transfers a downlink PDU received from a DN to a UE via a (R)AN, and transfer an uplink PDU received from a UE to a DN via a (R)AN.       

     Specifically, the UPF may support functions such as an anchor point for intra/inter RAT mobility, an external PDU session point of interconnection (interconnect) to a data network, packet routing and forwarding, a user plane part of implementation of policy rules and packet inspection, lawful intercept, reporting the amount of traffic used, an uplink classifier for supporting routing of a traffic flow to a data network, a branching point for supporting a multi-homed PDU session, QoS handling for a user plane (e.g., packet filtering, gating, implementing uplink/downlink rate), verifying uplink traffics (SDF mapping between a service data flow (SDF) and a QoS flow), marking a transport level packet in an uplink and downlink, buffering a downlink packet, triggering a downlink data notification, and the like. Some or all of the functions of a UPF may be supported in a single instance of a single UPF.
         The AF interoperate with a 3GPP core network in order to provide a service (e.g., supporting functions such as application effect on traffic routing, accessing network capability exposure, interoperating with a policy framework for policy control, or the like).   The (R)AN is the generic term of a new radio access network that supports both an evolved E-UTRA (E-UTRA) that is an evolved version of the 4G radio access technology and a new radio (NR) (e.g., a gNB).       

     The gNB supports functions for radio resource management (i.e., radio bearer control, radio admission control, connection mobility control, dynamic allocation of resources (i.e., scheduling) to a UE in an uplink/downlink), Internet protocol (IP) header compression, encryption of a user data stream and integrity protection, selecting an AMF in the case of attachment of a UE if routing to the AMF is not determined based on information provided to a UE, user plane data routing to UPF(s), control plane information routing to an AMF, connection setup and release, scheduling and transmitting a paging message (generated from an AMF), scheduling and transmitting system broadcast information (generated from an AMF or operating and maintenance (O&amp;M)), measuring for mobility and scheduling and configuring a measurement report, transport level packet marking in an uplink, session management, supporting network slicing, QoS flow management and mapping to a data radio bearer, supporting a UE in an inactive mode, distributing a NAS message, a NAS node selecting function, sharing a radio access network, dual connectivity, tight interworking between an NR and a E-UTRA, and the like.
         The UE is a user device. The UE may also be referred to as a terminal, a mobile equipment (ME), a mobile station (MS), and the like. In addition, the UE may be a portable device such as a notebook, a portable phone, a personal digital assistant (PDA), a smartphone, a multimedia device, or the like, or may be a nonportable device such as a personal computer (PC), an in-vehicle device, or the like.       

     Although an unstructured data storage network function (UDSF), a structured data storage network function (SDSF), a network exposure function (NEF), and an NF repository function (NRF) are not illustrated for explicit description in  FIG.  1   , all NFs illustrated in  FIG.  5    may interoperate with a UDSF, an NEF, and an NRF when needed.
         The NEF may provide a unit for safely exposing, for example, services and capabilities for 3 rd  party, internal exposure/re-exposure, an application function, edge computing provided by 3GPP network functions. The NEF receives information (information based on exposed capability(capabilities) of another network function(s)) from another network function(s). The NEF may store information received as structured data using an interface standardized based on a data storing network function. The stored information may be re-exposed to another network function(s) and an application function(s) by the NEF, and may be used for another purpose such as analysis or the like.   The NRF may support a service discovery function. An NF discovery request is received from an NF instance, and discovered NF instance information is provided to the NF instance. In addition, the NRF maintains available NF instances and services supported by them.   The SDSF is a selective function for supporting a function in which an NEF performs storing and retrieval of information as structured data.   The UDSF is a selective function for supporting a function in which an NF performs storing and retrieval of information as unstructured data.       

     For ease of description, although  FIG.  1    illustrates a reference model in the case in which a UE accesses a single DN using a single PDU session, the disclosure is not limited thereto. 
     The UE may simultaneously access two data networks (i.e., a local data network and a central data network) using multiple PDU sessions. In this instance, two SMFs may be selected for different PDU sessions. Each SMF may have a capability of controlling both a local UPF and a central UPF in a PDU session. 
     In addition, the UE may simultaneously access two data networks (i.e., a local data network and a central data network) provided in a single PDU session. 
     In 3GPP system, a conceptual link that connects NFs in the 5G system is defined as a reference point. Examples of a reference point included in the 5G system architecture expressed in  FIG.  1    are as follows.
         N1: a reference point between a UE and an AMF   N2: a reference point between an (R)AN and an AMF   N3: a reference point between an (R)AN and a UPF   N4: a reference point between an SMF and a UPF   N5: a reference point between a PCF and an AF   N6: a reference point between a UPF and a data network   N7: a reference point between an SMF and a PCF   N8: a reference point between a UDM and an AMF   N9: a reference point between two core UPFs   N10: a reference point between a UDM and an SMF   N11: a reference point between an AMF and an SMF   N12: a reference point between an AMF and an AUSF   N13: a reference point between a UDM and an authentication server function (AUSF)   N14: a reference point between two AMFs   N15: a reference point between a PCF and an AMF in the case of a non-roaming scenario, and a reference point between a PCF and an AMF in a visited network in the case of a roaming scenario       

       FIG.  2    is a diagram illustrating the configuration of a network entity in a wireless communication system according to various embodiments. 
     A network entity of the disclosure is a concept including a network function according to the implementation of a system. The ending ‘unit’ or ‘-er’ used hereinafter may refer to a unit by which at least one function or operation is performed, and may be embodied as hardware, software, or a combination of hardware and software. 
     The network entity according to various embodiments of the disclosure may include a communication unit  210 , a storage  220 , and a controller  230  that controls the overall operation of a network entity  200 . 
     The communication unit  210  performs signal transmission and reception with other network entities. Accordingly, a part or all of the communication unit  210  may be referred to as a ‘transmitter’  211 , a ‘receiver’  213 , or a ‘transceiver’  210 . 
     The storage  220  stores data, such as a basic program, an application program, configuration information, and the like for operating the network entity  200 . The storage  220  may be embodied as a volatile memory, a non-volatile memory, or a combination of a volatile memory and a non-volatile memory. The storage  220  provides data stored therein in response to a request from the controller  230 . 
     The controller  230  controls the overall operation of the network entity  200 . For example, the controller  230  performs signal transmission and reception via the communication unit  210 . In addition, the controller  230  records data in the storage  220 , and reads the recorded data. The controller  230  may perform the functions of a protocol stack that the communication standard requires. To this end, the controller  230  may include a circuit, an application-specific circuit, at least one processor, or micro-processor, or may be a part of a processor. In addition, a part of the communication unit  210  and the controller  330  may be referred to as a communication processor (CP). The controller  230  may control the network entity  200  to perform any one of the operations disclosed in various embodiments of the disclosure. 
     The communication unit  210  and the controller  230  may not necessarily need to be embodied as separate modules, and may be embodied as a single component in the form of a single chip or a software block. The communication unit  210 , the storage  220 , and the controller  230  may be electrically connected. In addition, the operations of the network entity  200  may be implemented by including the storage  220  that stores corresponding program code in the network entity  200 . 
     The network entity  200  may include a network node, and may be one of a base station (RAN), an AMF, an SMF, a UPF, an NF, an NEF, an NRF, a CF, an NSSF, a UDM, an AF, an AUSF, an SCP, a UDSF, an NWDAF, a context storage, an OAM (operations, administration, and maintenance), an EMS, a configuration server, and an identifier (ID) management server. 
     The 3rd generation partnership project (3GPP) that works on the standard of the cellular mobile communication names a new core network structure ‘5G core (5GC)’ and proceeds with standardization in order to evolve the legacy 4G long term evolution (LTE) system to a 5G system. 
     Compared to an evolved packet core (EPC) that is a network core for the legacy 4G, the 5GC may support a differentiated function as follows. 
     First, the 5GC introduces a network slice function. Requirements for the 5G, the 5GC needs to support various types of UE and services. Examples of the 5G service may include an enhanced mobile broadband (eMBB), ultra reliable low latency communications (URLLC), and massive machine type communications (mMTC). Such UE/service may require different requirements from each core network. For example, in the case of an eMBB service, a high data transmission speed (data rate) is required, and in the case of a URLLC service, high reliability and low latency are required. Technology provided to satisfy such various service requirements is a network slice scheme. A network slice is a method of configuring multiple logical networks via virtualization of a single physical network, and each network slice instance (NSI) may have a characteristic different from one another. Therefore, each NSI may have a network function (NF) appropriate for its characteristic, and thus various service requirements may be satisfied. Various 5G services may be efficiently supported by allocating an NSI appropriate for the characteristic of a service that each UE requires. 
     Second, the 5GC may easily support a network virtualization paradigm via separating a mobility management function and a session management function. In the legacy 4G LTE, all UEs may receive a service over a network by exchanging signaling with single core equipment named ‘mobility management entity’ (MME) that is in charge of registration, authentication, mobility management and session management functions. However, in the 5G, the number of UEs is explosively increased and mobility and traffic/session characteristic that needs to be supported for each type of UE is subdivided. Accordingly, when single equipment such as an MME supports all functions, scalability that adds an entity for each function needed may deteriorate. Therefore, based on a structure that separates a mobility management function and a session management function in order to improve scalability from the perspective of a signaling load and the function/implementation complexity of core equipment that is in charge of a control plane, various functions are being developed. 
     Various embodiments of the disclosure provide a method and apparatus for providing a low-latency location information service in a wireless communication system. A high-precision and low-latency location information service that the 5G service requires may need a service response time less than or equal to 1 second. In the case of the discontinuous reception (DRX) cycle of a UE, 1.2 seconds is default for a voice over LTE (VoLTE) UE. Accordingly, if such DRX cycle is maintained, requirements of the high-precision and low-latency location information service may not be satisfied. In the case in which a request for the high-precision and low-latency location information service is received, various embodiments of the disclosure may provide a method and apparatus for providing a location information service that satisfies the requirements of a low-latency service response time. 
     According to various embodiments of the disclosure, in order to satisfy the requirements of the location information service, by shortening a period that periodically inspects a paging message in an idle state of a UE, a low-latency location information service may be provided even in the case in which the UE is in the idle state. 
       FIG.  3    is a diagram illustrating a network structure (including an LMF) that provides a core network location information service and an interface in a wireless communication system according to various embodiments of the disclosure. 
     Specifically,  FIG.  3    illustrates a network architecture that supports a location measurement service in a wireless communication system according to various embodiments of the disclosure.  FIG.  3    illustrates the network structure (or the network architecture) of the 5G system and an interface according to various embodiments. 
     Referring to  FIG.  3   , the network structure of the 5G system may include a user equipment (UE), a radio access network ((R)AN), a user plane function (UPF), a data network (DN), an authentication server function (AUSF), an access and mobility management function (AMF), a session management function (SMF), a network slice selection function (NSSF), a network exposure function (NEF), a network repository function (NRF), a policy control function (PCF), a unified data management (UDM), an application function (AF), or the like. 
     According to various embodiments of the disclosure, the UE may be a terminal. The AMF is a network function that manages the mobility of a UE. The SMF is a network function that manages a packet data network connection provided to a UE. The connection is referred to as a protocol data unit (PDU) session. The PCF is a network function that applies the service policy and the charging policy of a mobile communication operator for a UE, and a policy associated with a PDU session. The unified data management (UDM) is a network function that stores and manages information associated with a subscriber. The NEF is capable of accessing information that manages a UE in the 5G network, and may be connected to 5G core network functions (NF) so as to transfer information associated with a UE to corresponding NFs and to report information associated with the UE to the outside, such as subscribing a mobility management event of the corresponding UE, subscribing a session management event of the corresponding UE, requesting for session-related information, configuring charging information of the corresponding UE, requesting for changing a PDU session policy for the corresponding UE, and the like. The 5G-radio access network (5G-RAN) is a base station that provides a radio communication function to a UE. In  FIG.  3   , it is illustrated as a (R)AN. The user plane function (UPF) may act as a gateway that transfers a packet transmitted or received. The UPF is connected to a data network (DN), and may perform a function of transferring a data packet produced from the 5G system to an external data network. The UPF may be connected to, for example, a data network connected to the Internet, and may perform routing a data packet transmitted from a UE to the Internet. 
     The 5G system may provide a high-precision and low-latency location information service. 
     Referring to  FIG.  3   , a location management function (LMF) may be a network function that is in charge of generally managing resources needed for providing the location information of a UE registered in the 5G system. The LMF calculates the location information of a UE or finally identifies the location of the UE, and reports the same to a global mobile location center (GMLC). 
     The LMF may receive a location information request associated with an objective UE from the AMF via an Nlmf interface. The LMF may exchange location information needed for a UE-based positioning method or a UE-assisted positioning method, and such protocol is referred to as an LTE positioning protocol. 
     According to various embodiments of the disclosure, the protocol named ‘LPP’ is a protocol used between a UE and a location information positioning server (an LMF or an LMC in various embodiments of the disclosure), for the UE-based positioning method or the UE-assisted positioning method. The LPP protocol is a protocol that is not necessarily limited to the 4G LTE, and may be used for 5G new radio (NR). 
     The LMF may determine a positioning result on geographical co-ordinates described in the technical document TS 23.032 that is the 3GPP standard. The positioning result determined by the LMF may include the speed of a UE. In addition, the LMF may perform the following functions. 
     (1) provide a location information service in response to a UE location information request from a serving AMF in association with an objective UE. 
     (2) provide a location information service in response to a request associated with an objective UE from a serving AMF that is triggered based on a UE location or periodically. 
     (3) determine a positioning scheme based on whether the functions of a UE and an operator network are supportable (capability), a QoS, and the type of LCS client. 
     (4) report, to a GMLC, UE positioning information associated with an objective UE that is triggered based on a UE location or periodically. 
     (5) cancel a UE positioning information report associated with an objective UE that is triggered based on a UE location or periodically. 
     (6) the LMF provides auxiliary data for providing location information broadcasted to a UE via an NG-RAN. 
     In the embodiment of  FIG.  3   , the gateway mobile location centre (GMLC) may provide a function needed for providing a location information service (location service). One or more GMLCs may be present in a single operator. A single GMLC is a first node that an external LCS client accesses when the external LCS client accesses an operator network. An AF and an NF in the 5G core (5GC) network that accesses the GMLC may directly access the GMLC, or may access the GMLC via an NEF. The GMLC may request routing information and the personal information of an objective UE from an UDM via a Nudm interface. After identifying the authorities of the AF and the external LCS client, and verifying the personal information of an objective UE, the GMLC may forward a location information request to the serving AMF via a Namf interface. In the case in which the UE performs roaming, the GMLC may forward a location information request to a PLMN of another operator network. Before transmitting a positioning result associated with the objective UE, the personal information configuration of the UE needs to be identified, and the personal information configuration always needs to be identified in a home operator network of the UE. A visited GMLC (VGLMC) is a GMLC that is present in a serving operator network of an objective UE. 
     A home GMLC (HGLMC) is a GMLC that is present in a home operator of an objective UE and performs a function of identifying the personal information of the objective UE. 
       FIG.  4    is a diagram illustrating a network structure (including an LMC) that provides a RAN-based location information service and an interface in a wireless communication system according to various embodiments of the disclosure. 
     Particularly,  FIG.  4    is a diagram illustrating a RAN-based location information service providing structure in a wireless communication system according to various embodiments of the disclosure. The embodiment of  FIG.  4    shows a network configuration that is different from the embodiment of  FIG.  3    that provides a location information service in the 5G system. 
     An LMF that performs a function of measuring location information in the embodiment of  FIG.  3    is configured to be connected to an AMF in the 5G core network via an interface. However, in the embodiment of  FIG.  4   , a location management component (LMC) performs a function of measuring the location information of a UE, and the LMC is located in a RAN. The LMC of  FIG.  4    performs the function of an LMF which has been described in the embodiment of  FIG.  3   . However, the LMC is present in an NG-RAN, and the LMC is connected to a gNB or ng-gNB via an L-IF. A UE, a GMLC, a UDM, an LCS client, an AF, and an NEF in the embodiment of  FIG.  4    may perform the same functions which have been described in the embodiment of  FIG.  3   . In the case in which the GLMC receives a location information request, the GMLC transfers the location information request to the AMF, and the AMF transfers the location information request to an NG-RAN via an N2 reference point. A gNB (or ng-gNB) transfers the received location information request to the LMC via the L-IF. 
     The location management component (LMC) is a network function that is in charge of generally managing resources needed for providing the location information of a UE. The LMC may calculate the location information of a UE or may finally identify the location of the UE, and may report the same to a global mobile location center (GMLC). 
     The LMC may receive the location information request associated with an objective UE that is transferred to the NF-RAN from the AMF via the N2 reference point. In the case in which the LMC is present as a separate NF in the NG-RAN as illustrated in  FIG.  4   , the LMC may be connected to a gNB via the L-IF interface. The gNB transfers, to the LMC, the location information request received from the AMF via the N2 reference. The LMC receives the location information request forwarded from the AMF via the gNB. The function of the LMC may be implemented in the gNB or NG-gNB, and in this instance, the L-IF is present inside the gNB or NG-gNB and may not be exposed to the outside. 
     The LMC may exchange location information needed for a UE-based positioning method or a UE-assisted positioning method, and such protocol is referred to as an LTE positioning protocol. According to various embodiments of the disclosure, the protocol named ‘LPP’ is a protocol used between a UE and a location information positioning server (an LMF or an LMC in various embodiments of the disclosure) for the UE-based positioning method or UE assisted positioning method. The LPP protocol is a protocol that is not necessarily limited to the 4G LTE, and may be used for the 5G NR. The LMF determines a positioning result on geographical co-ordinates described in TS 23.032 that is the 3GPP technical document. The positioning result determined by the LMC may include the speed of a UE. 
     In addition, the LMC may perform the following functions. 
     (1) receive a location information service in response to a UE location information request from a serving AMF associated with an objective UE. The location information request may be received from a gNB via an L-IF interface. 
     (2) receive a location information request associated with an objective UE from a serving AMF that is triggered based on a UE location or periodically. The location information request may be received from gNB via an L-IF interface. 
     (3) determine a positioning scheme based on whether functions of a UE and an operator network are supportable (capability), a QoS, and an LCS client type. 
     (4) report, to a GMLC, UE positioning information associated with an objective UE that is triggered based on a UE location or periodically 
     (5) cancel a UE positioning information report associated with an objective UE that is triggered based on a UE location or periodically 
     (6) the LMC provides auxiliary data for providing location information broadcasted to a UE via an NG-RAN. 
       FIG.  5    is a diagram illustrating a system structure wherein an LMC and an LMF coexist in a wireless communication system according to various embodiments of the disclosure. 
     Specifically,  FIG.  5    is a diagram illustrating a 5G system structure showing a structure in which a location management component (LMC) and a location management function (LMF) are present in a single serving operator. The LMC performs a function of a local LMF. 
     The descriptions associated with individual network functions are identical to the functions that have been described with reference to  FIG.  3    and  FIG.  4   . In the system structure of the embodiment of  FIG.  5   , an AMF may be aware of whether an LMC and an LMF are coexist. In addition, when receiving a location information request, the AMF may determine whether to use an LMC location information service or an LMF location information service in consideration of whether a protocol and function provided by a UE is provided, a precision level and positioning method provided by the LMC and the LMF, a location information request service quality included in a location information request message, a type of service and a service identifier, a location information service identifier, a location information response time, required precision of location information, and the like. 
     In the 5G service, there are requirements in associated with high-precision and low-latency positioning, as shown in Table 1 below. 
     Table 1 below lists requirements associated with high-precision and low-latency positioning. 
     
       
         
           
               
               
               
             
               
                   
                 TABLE 1 
               
             
            
               
                   
                   
               
               
                   
                 Accuracy (95% 
                   
               
               
                   
                 confidence level) 
               
            
           
           
               
               
               
               
               
               
            
               
                 Positioning 
                 Absolute(A) or 
                   
                 Vertical 
                 Positioning 
                 Positioning 
               
               
                 service 
                 Relative(R) 
                 Horizontal 
                 Accuracy 
                 service 
                 service 
               
               
                 level 
                 positioning 
                 Accuracy 
                 (note 1) 
                 availability 
                 latency 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 1 
                 A 
                 10 
                 m 
                 3 m 
                 95% 
                 1 s 
               
               
                 2 
                 A 
                 3 
                 m 
                 3 m 
                 99% 
                 1 s 
               
               
                 3 
                 A 
                 1 
                 m 
                 2 m 
                 99% 
                 1 s 
               
               
                 4 
                 A 
                 1 
                 m 
                 2 m 
                 99.9%     
                  15 ms 
               
               
                 5 
                 A 
                 0.3 
                 m 
                 2 m 
                 99% 
                 1 s 
               
               
                 6 
                 A 
                 0.3 
                 m 
                 2 m 
                 99.9%     
                  10 ms 
               
               
                 7 
                 R 
                 0.2 
                 m 
                 0.2 m   
                 99% 
                 1 s 
               
               
                   
               
            
           
         
       
     
     Referring to Table 1, in the case of positioning service levels 1, 2, 3, 5, and 7, a positioning service latency is 1 second. That is, the positioning service levels 1, 2, 3, 5, and 7 may requires a response time with low-latency. 
       FIGS.  6 A and  6 B  are diagrams illustrating a response time in association with a location information service (positioning service) in the case in which a UE is in a connected state or the UE is in an idle state in a wireless communication system. 
     The problem of the current technology is that a UE in the idle state is incapable of satisfying a service response time of approximately 1 second. In the case in which the UE is in the idle state, a provided service response time does not satisfy a service response time required based on a discontinuous reception (DRX) cycle. 
     For ease of description,  FIG.  6 A  illustrates a response time associated with a location information service (positioning service) in the case in which a UE is in the connected state, and  FIG.  6 B  illustrates a response time associated with a location information service (positioning service) in the case in which a UE is in the idle state. 
     Referring to  FIG.  6 A , T is the total time spent on a location information service, P is the time spent on a UE positioning procedure. The UE in the connected state performs UE positioning-related measurement and calculation of an estimated location immediately in response to a location information request, and thus T that is the total time spent on the location information service and P that is the time spent on the UE positioning procedure are the same. 
       FIG.  6 B  illustrates the time taken from the point in time of receiving a service location information service request and to the point in time of responding to the request for the location information service, in the case in which the UE is in the idle state. Referring to  FIG.  6 B , in the case in which the UE is in the idle state, the total time T spent on the total location information service may be calculated as shown in Equation 1 below. 
         T=W+S+P   Equation 1
 
     In Equation 1, T is the total time spent on a location information service. W is the time spent on standing by, staying in the idle state, until the UE requests a service. S is the time spent on performing a service request procedure after the UE awakes upon receiving a paging message. P is the time spent on a UE positioning procedure, that is, the time spent on UE positioning-related measurement and calculation of an estimated location. 
     In the case in which the UE is in the connected state, the total time spent on a location information service is the same as the time spent on performing a UE positioning procedure. Equation 2 below expresses the total time T spent on a location information service in the case in which the UE is in the connected state. 
         T=P   Equation 2
 
     In Equation 2, T is the total time spent on a location information service. P is the time spent on a UE positioning procedure, that is, the time spent on UE positioning-related measurement and calculation of an estimated location. 
     For example, in the case in which the UE is in the connected state and the time P spent on performing the UE positioning procedure is 0.3 seconds, T=0.3, and a location information service may be provided within 1 second that is a required service response time. 
     In the case in which the UE is in the idle state, the time spent on performing a UE positioning procedure is P, the time spent on a service request procedure is S, the time spent while the UE stands by in the idle state is W, and a set DRX cycle is D, W may be greater than or equal to 0 and less than or equal to D. In the case in which the UE is in the idle state, the total time T spent on a location information service may be calculated as shown in Equation 3 below. 
         T=W+S+P  where  O&lt;=W&lt;=D   Equation 3
 
     In Equation 3, T is the total time spent on a location information service. W is the time spent while the UE stays in the idle state and stands by until requesting for a service. S is the time spent on performing a service request procedure after the UE awakes upon receiving a paging message. P is the time spent on a UE positioning procedure, that is, the time spent on UE positioning-related measurement and calculation of an estimated location. 
     D is a set DRX cycle. For example, in the case in which S=0.1 and P=0.3, the total time T spent on the location information service may be calculated as shown in Equation 4 below. 
       0.4&lt;= T&lt;= 1.6  Equation 4
 
     In Equation 4, T is the total time spent on a location information service. 
     If it is assumed that a required service response time is 1 second, and the time spent on arrival of a location information service request is uniform, the probability that the total time spent on the location information service be less than or equal to a service response time, that is, the probability that the condition of a required service response time be satisfied may be as given in Equation 5 below. 
         P (0.4&lt;= T&lt;= 1.0)=0.5  Equation 5
 
     In Equation 5, T is the total time spent on a location information service. P is the probability that the total time spent on the location information service be less than or equal to a required service response time, that is, the probability that a required service response time be satisfied. 
     Based on Equation 5, in the case in which the UE is in the idle state, if 100 location information services that require a service response time of 1 second are present, a response time for 50 requests will be 1 or more seconds and service requirements may not be satisfied. 
     Hereinafter, an embodiment of  FIG.  7    provides a method of solving a problem in that the probability that a service requirement not be satisfied is high in the case in which a UE is in the idle state as described in the embodiment of  FIG.  6 B . 
       FIG.  7    is a diagram illustrating a response time in association with a location information service (positioning service) in the case in which a UE is in an idle state in a wireless communication system according to various embodiments of the disclosure. 
     Specifically, in order to solve the problem of the embodiment of  FIG.  6 B , the embodiment of  FIG.  7    provides a scheme of re-configuration a DRX cycle in the state in which the UE is the idle state. 
         W+S+P&lt;=R   Equation 6
 
     In Equation 6, W is the time spent while the UE stands by, staying in the idle state, until requesting for a service. S is the time spent on performing a service request procedure after the UE awakes upon receiving a paging message. P is the time spent on a UE positioning procedure, that is, the time spent on UE positioning-related measurement and calculation of an estimated location. R is a required response time. 
     In the case in which the time spent while the UE stands by in the idle state is W and a set DRX cycle is D, W is greater than 0 and less than D. W may have a value in the range of 0 to D, and thus in the case in which the value of W is set to D in order to satisfy the requirements of a service, this may be as given in Equation 7 below. 
         D+S+P R   Equation 7
 
     In Equation 7, D is a set DRX cycle, and S is the time spent on performing a service request procedure after the UE awakes upon receiving a paging message. P is the time spent on a UE positioning procedure, that is, the time spent on UE positioning-related measurement and calculation of an estimated location. R is a required response time. 
     If Equation 7 is transposed to the left-hand side of D, it is equal to Equation 8 as given below. 
         D&lt;=R −( S+P )  Equation 8
 
     In Equation 8, D is a set DRX cycle, and S is the time spent on performing a service request procedure after the UE awakes upon receiving a paging message. P is the time spent on a UE positioning procedure, that is, the time spent on UE positioning-related measurement and calculation of an estimated location. R is a required response time. 
     In order to satisfy the requirements of a service, that is, a required service response time, a DRX cycle D may be set to a value of R−(S+P). For example, when it assumed that R=1.0 seconds, S=0.1 seconds, and P=0.3 seconds, if D is set to D=0.6 seconds, the requirements of the service may be satisfied. 
     Embodiment 1 
       FIG.  8    is a diagram illustrating a process of re-configuration a DRX cycle of a UE in a wireless communication system according to various embodiments of the disclosure. 
     Specifically, in the embodiment of  FIG.  8   , there is provided a process of re-configuration a DRX cycle of an objective UE  811  in the case in which an AMF  813  receives a location information service request including the requirements of a service response time, or in the case in which the AMF  813  receives a location information service request from which the requirements of a service response time are inferable. 
     Operations  801   a  to  801   c  correspond to a process in which a location information service client transfers a location information service request. The request for a location information service may be initiated by a UE  811 , a base station  812 , or an external location service (LCS) client. 
     In operation  801   a , the UE  811  transmits a UE-originated location information request (mobile originated location request) message to the AMF  813 . In the case in which the UE  811  initiates a location information service, the UE  811  may transfer a location information request to the AMF  813  via an NAS message in operation  801   a.    
     In operation  801   b , the (R)AN  812  transmits a base station induced location information request (RAN induced location request) message to the AMF  813 . In operation  801   b , the base station  812  transfers a location information request to the AMF  813  via an N2 message. 
     In operation  801   c , a GMLC or NEF  815  transmits a UE terminated location information request (a mobile terminated location request) message to the AMF  813 . In operation  801   c , an external LCS client of a system transfers a location information request to the AMF  813  via the GMLC or NEF  815 . In the case in which the GMLC  815  receives the location information service request, the GMLC  815  transfers a UE context management (UECM) obtaining request to a UDM  814 . The GMLC  815  receives, from the UDM  814 , the address or the identifier of the AMF  813  that manages an objective UE of which the location is requested. The GMLC  815  transfers the location information request to the AMF  813 . 
     The AMF  813  receives a location information request message from at least one of the UE  811 , the base station  812 , or the GMLC  815 . In addition, the AMF  813  may receive a location information request message from the NEF  815 . In addition, the AMF  813  may receive a location information subscription request from the UDM  814 . A location provision request message or a subscription request message associated with a location provision service report received by the AMF  813  includes the information as follows. 
     (1) location information QoS (location QoS) information: information indicating the quality of a service for a location information request. The information may include location precision and service response time information. In addition, the type of location information service or the delimiter of a location information service may be included. The location information quality information may be a location service quality index corresponding to location precision and a service response time. The location service quality index may be autonomously stored in advance in the AMF  813 . Alternatively, the index may be received from an external NF of the AMF  813 , for example, a UDM or a PCF. 
     (2) location information service information: The type of location information service and the delimiter of a location information service may be set in advance in the AMF  813 . The type of location information service and the delimiter of a location information service may be received from a device stored in a PCF or the UDM  814  that is an external NF of the AMF  813 . The AMF  813  may extract location information service quality information mapped to the type of location information service and the delimiter of a location information service set in the AMF  813 . The type of location information service may be used when the AMF  813  or a location management component (LMC) determines a positioning method to be used for determining the location of the UE  811 . 
     In operation  802 , the AMF  813  determines to update a UE configuration based on a location information QoS (location QoS), and a 5G enhanced positioning area. According to an embodiment, the location information QoS includes location precision, a service level, a response time, and the like, and the UE configuration includes a DRX cycle. In operation  802 , the AMF  813  receives the location information request in operations  801   a  to  801   c . The time P spent on performing a positioning procedure of the UE  811  and the time S spent while the UE performs a service request procedure are set in advance in the AMF  813 . Based on a required response time for the location information service request and the values set in advance, the AMF  813  calculates a DRX cycle that needs to be set for the UE  811 . Alternatively, the AMF  813  may obtain, from information mapped in advance, a service response time required by the type of location information service or a service identifier, and may calculate a DRX parameter (e.g., a DRX cycle) that needs to be set for the UE based on the service response time or may obtain the same from information set in advance. 
     Subsequently, in operations  803  to  809 , a UE configuration update procedure is performed. When it is determined that a DRX parameter currently set is incapable of satisfying a service response time of a location information service request that may be continuously provided in the future, the AMF  813  determines to change the configuration of the DRX parameter. In the case in which the AMF  813  determines to change the DRX parameter, the AMF  813  initiates the UE configuration update procedure. 
     In operation  803 , the AMF  813  transmits a UE configuration update command message to the UE  811 . According to an embodiment, the UE configuration update command message includes DRX parameters, an indication of re-registration, and the like. In operation  803 , the AMF  813  calculates a DRX cycle length required for providing a low-latency location information service, and determines a DRX parameter to be transferred to the UE  811 . When the AMF  813  desires to update a parameter related to access ad mobility for the UE  811 , the AMF  813  initiates the UE configuration update procedure. In order to change a UE specific DRX cycle for the UE  811 , the AMF  813  performs the UE configuration update procedure so that the UE  811  re-performs a registration procedure in the connected state. When performing the UE configuration update procedure, the AMF  813  transmits, to the UE  811 , an indicator indicating initiation of the registration procedure. The procedure may be transferred to the UE via 3GPP access or Non-3GPP access. The AMF  813  transfers, to the UE  811 , the UE configuration update command including a DRX parameter (e.g., including a DRX cycle length) proposed by the AMF  813 , and an indicator indicating initiation of the registration procedure. In the case of transferring the UE configuration update command message, if the AMF  813  transfers the UE configuration update command to the UE  811 , the AMF  813 , to the UE  811 , one or more UE parameters, for example, a configuration change indicator, a globally unique temporary identifier (5G-GUTI), a tracking area identity (TAI) list, allowed network slice selection assistance information (NSSAI), allowed NSSAI mapping information, a rejected S-NSSAI list, mobility restriction information, local access data network (LADN) information, mobile initiated connection only (MICO), access classification definition information defined by an operator, and the like, together with a DRX parameter. 
     In the case in which the DRX parameter (e.g., including a DRX cycle defined for each UE) proposed by the AMF  813  is transferred to the UE  811 , the UE  811  may select a parameter that is acceptable by the UE  811  from among the “DRX parameters proposed by the AMF  813 ” received from the AMF  813 , and may set the same as a DRX parameter requested by the UE  811 . 
     The AMF  813  calculates a DRX cycle length required for providing a low-latency location information service, draws a DRX parameter to be transferred to the UE  811 , and transmits, to the RAN  812 , a request for configuring the DRX parameter for the UE  811  in operation  806 . 
     In operation  804 , the UE  811  transmits a UE configuration update complete message to the AMF  813 . In the case in which the UE configuration update indicator that the UE  811  receives in operation  803  requests the UE to transmit a response message to the UE configuration update command, the UE  811  transfers the UE configuration update complete message to the AMF  813  in operation  804 . In the case in which the UE  811  selects a DRX parameter that is acceptable by the UE  811  from among the DRX parameters transferred from the AMF  813 , the UE  811  may transfer the UE configuration update complete message including the list of DRX parameters that the UE  811  allows. 
     In operation  805 , the AMF  813  transmits a Nudm SDM Info service message to the UDM  814 . In operation  805 , the AMF  813  stores a DRX parameter defined for each UE, which is to be set for the UE  811 , in the UDM  814 . 
     In operation  806 , the AMF  813  transmits a RAN update (update RAN) message to the (R)AN  812 . After performing operation  803 , the AMF  813  may proceed with operation  806 . Alternatively, the AMF  813  may not perform operations  803 ,  804 , and  805 , and may only proceed with operation  806 . The AMF  813  sets a DRX parameter that is calculated and determined for the UE  811  in operation  802 , which is to be proposed to the RAN  812 , and may transfer the DRX parameter proposed by the AMF  813  to the RAN  812 . In the case in which the RAN  812  receives a DRX parameter, the RAN  812  may change a configuration of the DRX parameter transferred to the UE  811 . Particularly, the RAN  812  determines a DRX parameter to be set for the UE  811 , and transfers an RRC-reconfiguration message to the UE  811  so as to set a DRX cycle defined for each UE. 
     In operation  807 , the UE  811  decides to re-configure a DRX parameter. In the case in which parameters for which the UE  811  needs to change an RRC configuration in an AS layer are present among DRX parameters received via the UE reconfiguration update command (UE configuration update command) message, the UE  811  may transfer an indicator indicating change of a DRX configuration parameter to the AS layer in the UE  811 . The UE  811  may store or change a DRX set value in the AS layer. 
     In operation  808 , the UE  811  transmits a registration request message to the AMF  813 . According to an embodiment, the registration request message includes DRX parameters. The UE  811  may finally determine a DRX parameter that the UE  811  is to use from among the DRX parameters received from the AMF  813 . The UE  811  determines to update a registration procedure, and transmits the registration request message including the determined DRX parameter to the AMF  813 . The AMF  813  receives a UE request DRX parameter included in the registration request message. The DRX parameter includes an idle state DRX cycle. The value of the idle state DRX cycle is a value equal to the value of D in above-described Equation 3, and may be a value for determining the maximum value of W of the location information service. 
     The DRX cycle in the idle state may correspond to both cases, that is, the case in which the UE  811  is in an CM-IDLE state and the case in which the UE  811  is in an RRC inactive state. After the UE  813  determines a DRX cycle value to be used by the UE  813  based on the DRX parameter that the AMF  813  proposes and is received via the UE configuration update command message, and determines to use the DRX cycle value, in the case in which the UE  811  transfers a registration request message including a UE requested DRX parameter to the AMF  813 , the AMF  813  determines an allowed DRX parameter according to the UE requested DRX parameter transmitted by the UE  811 . When determining the DRX parameter, the AMF  813  may adopt the value requested by the UE  811 , as it is. Alternatively, the AMF  813  changes the DRX parameter value requested by the UE  811  according to an operator policy. 
     In the case in which the UE  811  is an RRC inactive with CM-CONNECTED, the UE  811  may apply a DRX cycle broadcasted by the RAN  812 . Alternatively, the UE  811  may set a DRX cycle set by the RAN  812 . 
     In operation  809 , the AMF  813  transmits a registration accept message to the UE  811 . According to an embodiment, the registration accept message includes an accepted DRX parameter. The AMF  813  transfers the adopted DRX parameter that the AMF  813  finally determines to the UE  811 . After operation  809 , the AMF  813  transmits a DRX parameter to the RAN  812  as shown in operation  806 , and the RAN  812  may change a set value for the DRX parameter transferred to the UE  811  via broadcasting. Alternatively, the RAN  812  may change an RRC configuration associated with a DRX parameter defined for each UE, with respect to the corresponding UE  811 . 
     Embodiment 2 
       FIG.  9    is a diagram illustrating a process of performing a UE configuration update procedure after performing a UE positioning procedure in a wireless communication system according to various embodiments of the disclosure. 
     In operation  901   a  to  901   c , an AMF  914  receives a location information service request as described in operations  801   a  to  801   c  of the embodiment of  FIG.  8   . 
     In operation  901   a , a UE  911  transmits a UE-originated location information request (mobile originated location request) message to the AMF  914 . 
     In operation  901   b , an (R)AN  912  transmits a base station induced location information request (RAN induced location request) message to the AMF  914 . 
     In operation  901   c , a GMLC or NEF  916  transmits a UE terminated location information request (mobile terminated location request) message to the AMF  914 . 
     In operations  902   a  to  902   c , a LMC-based location information service request function is performed. Based on the location information request message received in operation  901   a  to  901   c  and existing information available for the AMF  914 , the AMF  914  may determine information included in an N2 location control request. 
     The information available for the AMF  914  are as follows. 
     (1) location service quality information (location QoS): service quality index information corresponding to the precision of a location request and a service response time 
     (2) location information service information: information associated with a service that requests a location information service, for example, the type of service, a service delimiter, or a service identifier. 
     (3) UE LCS capability: information associated with whether the location information service of the UE  911  is supported and protocol information for providing an LCS function of the UE  911  (an LPP over an RRC (LPP over RRC) or an LPP over a NAS (LPP over NAS), or a user plane protocol, for example, an open mobile alliance secure user plane location (OMA-SUPL)). 
     (4) a method of supporting UE location information service: an LMC utilization method, an LMF utilization method, and a location control report utilization method. 
     Based on information available for the AMF  914 , information to be included in a message (e.g., a N2 location control request) related to location information to be requested from the RAN  912  is determined. 
     The information included in the N2 location control request are as follows. 
     (1) an indicator indicating whether to use a RAN-based positioning technology 
     (2) an LPP transport protocol (an LPP over an RRC (LPP over RRC) utilization indicator or a user plane utilization) 
     (3) an index indicating required location information service quality (e.g., positioning QoS index (location QoS index)) 
     (4) an indicator indicating a direct positioning method (e.g., a positioning method index) 
     (5) the type of location information request (e.g., a one-time report, a periodic report, a triggered location report) 
     (6) an area of interest 
     In operation  902   a , the AMF  914  transmits an N2 location information request (N2 location request) message to the (R)AN  912 . 
     The AMF  914  transfers the N2 location control request message to the RAN  912 . 
     To measure the time spent on UE positioning, the AMF  914  records the times at which the identifier of a request of a message transferred to the AMF  914  or a transaction identifier, the identifier of the UE  911 , and a message for requesting the RAN  912  node to measure location information are transmitted. 
     In order to measure, by the RAN  912  or the LMC  913 , the time spent on UE positioning, the AMF  914  includes an indicator indicating measurement of a positioning measurement time required and report of the same (i.e., a UE positioning time required report indicator) in the N2 location control request and transmits the same. The RAN  912  or the LMC  913  that receives the UE positioning time required report indicator measures the time spent on UE positioning, includes the time actually spent on UE positioning in a location measurement response message or a location measurement report message and transfers the same. 
     In operation  902   b , a UE positioning procedure is performed. 
     The RAN node  912  that receives the N2 location control request message determines, based on information included in the location control request message, the following items. 
     (1) information associated with whether the NG-RAN node (gNB or ng-gNB)  912  is to transfer a location information request to the LMC  913 . 
     (2) in the case in which a plurality of LMCs are present, the LMC  913  that is to request location information associated with an objective UE is selected among the plurality of LMCs. 
     (3) the LMC  913  that supports a positioning method included in the N2 location control request message is selected among the LMCs. 
     In the case in which an LMC capable of performing a requested N2 location control request is present, the RAN  912  initiates a positioning request procedure of the LMC. Via a positioning request initiating message, a content included in the N2 location control request message received from the AMF is transferred. The content included in the control request message is as follows. 
     (1) location service quality-related information: precision, a service response time, or a location service quality index, which is information to which location information precision and location information service response time information are mapped. 
     (2) LPP transport protocol (an LPP over an RRC (LPP over RRC) utilization indicator or a user plane utilization) 
     (3) an indicator indicating a positioning method (e.g., a positioning method index) 
     (4) the type of location information request (e.g., a one-time report, a periodic report, a triggered location report) 
     The LMC  913  that receives a request for initiating a positioning procedure determines a positioning procedure and performs the positioning procedure based on the content included in the message received from the RAN node  912 . 
     The UE  911  and the LMC  913  may perform the positioning procedure according to a positioning protocol (e.g., an LPP, or an LPP over an RRC (LPP over RRC)) or an LPP over a NAS (LPP over NAS). The positioning procedure may be performed as a procedure of determining a UE-based positioning method or as a procedure of a UE-assisted positioning method. According to the UE-based positioning method, the UE  911  directly calculates the location of a UE based on the location measurement information of the UE  911 . In the case in which the UE  911  measures an estimated location, the UE  911  reports, to the LMC  913 , the estimated location of the UE  911  that is calculated based on a location measurement protocol (e.g., an LPP). 
     According to the UE-assisted positioning method, the UE  911  reports, to the LMC  913  that is a location information server, measurement information needed for measuring the location of the UE  911 , and the LMC  913  calculates the estimated location of the UE  911  based on the location measurement information received from the UE  911 . 
     The LMC  913  that completes measuring the location of the objective UE  911  transfers a positioning report message to the NG-RAN  912 . The positioning report message may include the identifier of a request so that a receiver determines a location information report associated with a report corresponding to the corresponding request. 
     The positioning report message of the UE  911  may include the following content of the location information report according to the location information request associate with the UE  911 . 
     (1) the current location of the UE  911  in the 3GPP system (e.g., a cell identifier, a tracking area (TA) identifier, an LMC identifier, an area of interest or the identifier of an area of interest, or a presence reporting area or the identifier of a presence reporting area.) 
     (2) location information associated with the geographic area description (GAD) of the UE  911  The information associated with the GAD may be information expressing the location of the surface of the Earth ellipsoid as latitude and longitude, and may be information further expressing latitude and longitude, and an inaccurate circular shape or ellipsoid information, or polygonal shape information including a plurality of latitudes/longitudes. In the case in which high-precision location information is requested, each of the latitude information and longitude information may include location information provided in a high-precision form that uses 32 bits. In the case in which high-precision location information is not requested, the longitude and latitude information may include location information expressed in the form of 24 bits. 
     (3) the speed and direction of the movement of the UE  911 : information associated with the speed and direction of the movement of the UE  911  that are calculated based on information associated with a movement made by the UE  911  during a predetermined period of time. 
     (4) information indicating that the movement of the UE  911  greater than or equal to a predetermine distance is detected: in the case in which the distance that the UE  911  moves is greater than a distance designated as a threshold value, it is determined that the UE  911  has moved. When it is determined that the UE  911  has moved, a report associated with UE movement detection is recorded, and an indicator indicating the UE movement detection and a travelled distance or path are included. 
     (5) designated location related event information: information indicating that entry into or leaving from a designated place is made, information indicating a movement is made within a designated place, or information indicating that a stationary state is continuously maintained within a designated place. 
     (6) whether a high-precision location information signal is detected: information indicating that the UE  911  detects a predetermined positioning technology (e.g., ultra wide band (UWB), a wireless fidelity (Wi-Fi), Bluetooth (BT), and the like) therearound. 
     In the case in which the LMC  913  receives, via the RAN  912 , a UE positioning time required report indicator transferred from the AMF  914 , the LMC  913  calculates the time spent on performing UE positioning. In order to measure the time spent on performing UE positioning, the LMC  913  may record the time at which a UE positioning protocol (e.g., an LPP) is initiated, and measures the time spent on performing UE positioning by calculating the difference between the initiation time and the time at which the UE positioning protocol is completely performed. 
     In operation  902   c , the (R)AN  912  transmits an N2 location information report (N2 location report) message to the AMF  914 . The AMF  914  receives the location information report from the base station  912 . The location information report may include information associated with the location information request that the base station  912  receives in operation  902   a . The AMF  914  identifies the information associated with the location information request via a request identifier included in the location information request. The AMF  914  determines a node to which a report message or a response to the location information request is to be transmitted based on the information identified from the request identifier. 
     In operation  902   c , in order to calculate the time that the AMF  914  spends on location information measurement, the AMF  914  records a location information request time, a UE identifier, and a location information request identifier, and receives a response corresponding thereto. The AMF  914  calculates the difference between the current time and the time at which location information is requested, so as to calculate the time spent on performing UE positioning. 
     Alternatively, in order to calculate, by the AMF  914 , the time spent on location information measurement, in the case in which a location information request includes a UE positioning time required report indicator, the AMF  914  may receive the time spent on performing UE positioning via a response message corresponding to the location information request or a UE location measurement report message. The AMF  914  may calculate the time spent on UE location measurement by adding the time spent on performing UE positioning in the LMC  913  or the RAN  912  and a backhaul network delay time. 
     A control plane backhaul network delay time may be the time spent on transferring a control message between the AMF  914  and the NG-RAN  912 . Measuring the control plane backhaul network delay time may be calculated by measuring a round trip delay time of an NG-AP that is a control plane interface between the AMF  914  and the NG-RAN  912 . Alternatively, that may be set in advance based on configuration information of a backhaul network installed between the AMF  914  and the NG-RAN  912 . 
     In operation  903 , the AMF  914  determines to update UE configuration based on a location information QoS (location QoS) and a 5G enhanced positioning area. According to an embodiment, the location information QoS includes location precision, a service level, a response time, and the like, and the UE configuration includes a DRX cycle. 
     As described above, Equation 7 is given as D+S+P&lt;=R. 
     In operation  903 , the AMF  914  calculates a D value based on a P value, an R value, and an S value in Equation 7. Specifically, the AMF  914  obtains the time (P in Equation 7) spent on performing UE location measurement that includes measurement or calculation performed in operations  902   a  to  902   c . In addition, in operations  901   a  to  901   c , the AMF  914  obtains a location information service response time (R in Equation 7) included in location information request service quality information included in the received location measurement request. The AMF  914  may obtain a service request performing time (S in Equation 7) that is set and stored in the AMF  914 , that is, the time spent on performing a procedure in which the UE  911  is changed from a CM-IDLE state to a CM-CONNECTED state. Based on the P value, R value, and S value in Equation 7, the AMF  914  calculates a DRX cycle length value (D in Equation 7) that satisfies Equation 7. 
     Subsequently, in operations  904  to  910 , a UE configuration update procedure is performed. The AMF  914  performs the UE configuration update procedure in operations  904  to  910 , and performs a procedure of changing a DRX parameter calculated by the AMF  914 . Alternatively, the AMF  914  performs operation  907  (the same procedure as operation  806  in the embodiment of  FIG.  8   ), and configures a DRX parameter for the RAN  912 . 
     In operation  904 , the AMF  914  transmits a UE configuration update command message to the UE  911 . According to an embodiment, the UE configuration update command message may include DRX parameters, an indication of re-registration, and the like. In operation  904 , the AMF  914  performs the same procedure as operation  803  in the embodiment of  FIG.  8   . 
     In operation  905 , the UE  911  transmits a UE configuration update complete message to the AMF  914 . In operation  905 , the AMF  914  performs the same procedure as operation  804  in the embodiment of  FIG.  8   . 
     In operation  906 , the AMF  914  transmits a Nudm SDM Info service message to the UDM  914 . In operation  906 , the AMF  914  performs the same procedure as operation  805  in the embodiment of  FIG.  8   . 
     In operation  907 , the AMF  914  transmits a RAN update message (update RAN) to the (R)AN  912 . In operation  907 , the AMF  914  performs the same procedure as operation  806  in the embodiment of  FIG.  8   . 
     In operation  908 , the UE  911  decides to re-configure a DRX parameter. In operation  908 , the AMF  914  performs the same procedure as operation  807  in the embodiment of  FIG.  8   . 
     In operation  909 , the UE  911  transmits a registration request message to the AMF  914 . According to an embodiment, the registration request message includes DRX parameters. In operation  909 , the AMF  914  performs the same procedure as operation  808  in the embodiment of  FIG.  8   . 
     In operation  910 , the AMF  914  transmits a registration accept message to the UE  911 . According to an embodiment, the registration accept message includes an accepted DRX parameter. In operation  910 , the AMF  914  performs the same procedure as operation  809  in the embodiment of  FIG.  8   . 
     Embodiment 3 
       FIG.  10    is a diagram illustrating a process of performing a UE configuration update procedure after performing a location information service using an LMF in a location information service structure including an LMF in a wireless communication system according to various embodiments of the disclosure. 
     Operation  1001   a  to  1001   c  are the same as operations  801   a  to  801   c  in the embodiment of  FIG.  8   . 
     In operation  1001   a , a UE  1011  transmits a UE-originated location information request (mobile originated location request) message to an AMF  1013 . 
     In operation  1001   b , a (R)AN  1012  transmits a base station induced location request (RAN induced location request) message to the AMF  1013 . 
     In operation  1001   c , a GMLC or NEF  1015  transmits a UE terminated location information request (mobile terminated location request) message to the AMF  1013 . 
     Operations  1002   a  to  1002   c  correspond to a location information measurement procedure using the LMF  1014 . 
     In operation  1002   a , the AMF  1013  transmits a positioning request message to an LMF  1014 . The AMF  1013  transmits the positioning request message to the LMF  1014 . 
     In operation  1002   b , a UE positioning procedure is performed. The LMF  1014  performs the UE positioning procedure together with the UE  1011  by utilizing a UE positioning protocol (e.g., an LPP over an NAS (LPP over NAS)). 
     In operation  1002   c , the LMF  1014  transmits a positioning response message to the AMF  1013 . When the LMF  1014  completes positioning associated with the location of the UE  1011 , the LMF  1014  transmits the positioning response message to the AMF  1013 . 
     To measure the time spent on positioning of the UE  1011 , the AMF  1013  may record the times at which the identifier of a request of a message transferred to the AMF  1013  or a transaction identifier, the identifier of the UE  1011 , and a message for requesting the LMF  1014  to measure location information are transmitted. 
     In order to measure, by the LMF  1014 , the time spent on UE positioning, the AMF  1013  includes an indicator indicating measurement of a positioning measurement time required and report of the same (i.e., a UE positioning time required report indicator) in a positioning request (location determination request), and transmits the same. The RAN  1012  or the LMF  1014  that receives the UE positioning time required report indicator measures the time spent on performing UE positioning, and includes the time actually spent on UE positioning in a location measurement response message or a location measurement report message. 
     The content included in the positioning request message is as follows. 
     (1) location service quality related information: precision, a service response time, or a location service quality index, which is information to which location information precision and location information service response time information are mapped. 
     (2) an LPP transport protocol (an LPP over an RRC (LPP over RRC) utilization indicator or a user plane utilization) 
     (3) an indicator indicating a positioning method (e.g., a positioning method index) 
     (4) the type of location information request (e.g., a one-time report, a periodic report, a triggered location report) 
     The LMF  1014  that receives a request for initiating a positioning procedure determines, based on information included in the received message, a positioning procedure and performs the positioning procedure. The UE  1011  and the LMF  1014  performs the positioning procedure according to a positioning protocol (e.g., an LPP, or an LPP over an RRC (LPP over RRC)) or an LPP over a NAS (LPP over NAS). The positioning procedure may be performed as a procedure of determining a UE-based positioning method or as a procedure of a UE-assisted positioning method. According to the UE-based positioning method, the UE  1011  directly calculates the location of the UE  1011  via the location measurement information of the UE  1011 . In the case in which the UE  1011  measures an estimated location, the UE  1011  reports, to the LMF  1014  that is a location information server, the estimated location of the UE  1011  that the UE  1011  calculates according to a location measurement protocol (e.g., an LPP). 
     According to the UE-assisted positioning method, the UE  1011  reports, to the LMF  1014  that is the location information server, measurement information needed for measuring the location of the UE  1011 , and the LMF  1014  calculates the estimated location of the UE  1011  based on the location measurement information received from the UE  1011 . 
     The LMF  1014  that completes measuring the location of the objective UE  1011  transfers a positioning report message to the LMF  1014 . The positioning report message includes the identifier of a request so that a receiver determines a location information report associated with a report corresponding to the corresponding request. 
     The positioning report message of the UE  1011  may include the following content of the location information report according to the location information request associate with the UE  1011 . 
     (1) the current location of the UE  1011  in the 3GPP system (e.g., a cell identifier, a tracking area (TA) identifier, an LMC identifier, an area of interest or the identifier of an area of interest, a presence reporting area or the identifier of a presence reporting area.) 
     (2) location information associated with the geographic area description (GAD) of the UE  1011  The information associated with the GAD is information expressing the location of the surface of the Earth ellipsoid as latitude and longitude, and may include information further expressing latitude and longitude, an inaccurate circular shape or ellipsoid information, or polygonal shape information including a plurality of latitudes/longitudes. In the case in which high-precision location information is requested, each of the latitude information and longitude information includes location information provided in a high-precision form that uses 32 bits. In the case in which high-precision location information is not requested, the longitude and latitude information may include location information expressed in the form of 24 bits. 
     (3) the speed and direction of the movement of the UE  1011 : information associated with the speed and direction of the movement of the UE  1011  calculated based on information associated with a movement made by the UE  1011  during a predetermined period of time. 
     (4) information indicating that the movement of the UE  1011  greater than or equal to a predetermine distance is detected: In the case in which the distance that the UE  1011  moves is greater than a distance designated as a threshold, it is determined that the UE  1011  has moved. When it is determined that the UE  1011  has moved, a report associated with UE movement detection is recorded, and an indicator indicating the UE movement detection and a travelled distance or path are included. 
     (5) designated location related event information: information indicating that entry into or leaving from a designated place is made, information indicating a movement is made within a designated place, or information indicating that a stationary state is continuously maintained within a designated place. 
     (6) whether a high-precision location information signal is detected: information indicating that the UE  1011  detects a predetermined positioning technology (e.g., ultra wide band (UWB), a wireless fidelity (Wi-Fi), Bluetooth (BT), and the like) therearound. 
     In the case in which the LMF  1014  receives a UE positioning time required report indicator transferred from the AMF  1013 , the LMF  1014  calculates the time spent on performing UE positioning. In order to measure the time spent on performing UE positioning, the LMF  104  may record the time at which a UE positioning protocol (e.g., an LPP) is initiated, and may measure the time spent on performing UE positioning by calculating the difference between the initiation time and the time at which the UE positioning protocol is completely performed. 
     In operation  1002   c , the LMF  1014  transmits a positioning response message to the AMF  1013 . The AMF  1013  receives a location information report from the LMF  1014 . The location information report may include information associated with the location information request that the LMF  1014  receives in operation  1002   a . The AMF  1013  identifies the information associated with the location information request via a request identifier included in the location information request. The AMF  1013  determines a node (e.g., the UE  1011 , the base station  1012 , the GMLC or NEF  1016 ) to which a report message or a response to the location information request is to be transmitted based on the information identified from the request identifier. 
     In operation  1002   c , in order to calculate the time that the AMF  1013  spends on location information measurement, the AMF  1013  records a location information request time, a UE identifier, and a location information request identifier, and receives a response corresponding thereto. The AMF  1013  calculates the difference between the current time and the time at which location information is requested, so as to calculate the time spent on performing UE positioning. 
     Alternatively, in order to calculate the time that the AMF  1013  spends on location information measurement, in the case in which the location information request includes a UE positioning time required report indicator, the AMF  1013  may receive the time spent on performing UE positioning via a response message corresponding to the location information request or a UE location measurement report message. The AMF  1013  may calculate the time spent on UE location measurement by adding the time spent on performing UE positioning in the LMF  1014  and an additional delay time between the AMF and the LMF. 
     In operation  1003 , the AMF  1013  determines to update a UE configuration based on a location information QoS (location QoS) and a 5G enhanced positioning area. According to an embodiment, the location information QoS includes location precision, a service level, a response time, and the like, and the UE configuration includes a DRX cycle. 
     As described above, Equation 7 is given as D+S+P&lt;=R. 
     In operation  1003 , the AMF  914  calculates a D value based on a P value, an R value, and an S value in Equation 7. Specifically, the AMF  1013  obtains the time (P in Equation 7) spent on performing UE location measurement that includes measurement or calculation performed in operations  1002   a  to  1002   c . In addition, in operations  1001   a  to  1001   c , the AMF  1014  obtains a location information service response time (R in Equation 7) included in location information request service quality information included in the received location measurement request. The AMF  1014  may obtain a service request performing time (S in Equation 7) that is set and stored in the AMF  1014 , that is, the time spent on performing a procedure in which the UE  1011  is changed from a CM-IDLE state to a CM-CONNECTED state. Based on the P value, R value, and S value in Equation 7, the AMF  1014  calculates a DRX cycle length value (D in Equation 7) that satisfies Equation 7. 
     Subsequently, in operations  1004  to  1010 , a UE configuration update procedure is performed. The AMF  1013  performs the UE configuration update procedure in operations  1004  to  1010 , and performs a procedure of changing a DRX parameter calculated by the AMF  1013 . Alternatively, the AMF  1013  performs operation  1007  (the same procedure as operation  806  in the embodiment of  FIG.  8   ), and configures a DRX parameter for the RAN  1012 . 
     In operation  1004 , the AMF  1013  transmits a UE configuration update command message to the UE  1011 . According to an embodiment, the UE configuration update command message includes DRX parameters, an indication of re-registration, and the like. In operation  1004 , the AMF  1013  performs the same procedure as operation  803  in the embodiment of  FIG.  8   . 
     In operation  1005 , the UE  1011  transmits a UE configuration update complete message to the AMF  1013 . In operation  1005 , the AMF  1013  performs the same procedure as operation  804  in the embodiment of  FIG.  8   . 
     In operation  1006 , the AMF  1013  transmits a Nudm SDM Info service message to the UDM  1014 . In operation  1006 , the AMF  1013  performs the same procedure as operation  805  in the embodiment of  FIG.  8   . 
     In operation  1007 , the AMF  1013  transmits a RAN update (update RAN) message to the (R)AN  1012 . In operation  1007 , the AMF  1013  performs the same procedure as operation  806  in the embodiment of  FIG.  8   . 
     In operation  1008 , the UE  1011  decides to re-configure a DRX parameter. In operation  1008 , the AMF  1013  performs the same procedure as operation  807  in the embodiment of  FIG.  8   . 
     In operation  1009 , the UE  1011  transmits a registration request message to the AMF  1013 . According to an embodiment, the registration request message includes DRX parameters. In operation  1009 , the AMF  1013  performs the same procedure as operation  808  in the embodiment of  FIG.  8   . 
     In operation  1010 , the AMF  1013  transmits a registration accept message to the UE  1011 . According to an embodiment, the registration accept message includes an accepted DRX parameter. In operation  1010 , the AMF  1013  performs the same procedure as operation  809  in the embodiment of  FIG.  8   . 
     Embodiment 4 
       FIG.  11    is a diagram illustrating a process in which an AMF requests RRC re-configuration in the case in which an RRC inactive state is applied to a RAN in a wireless communication system according to various embodiments of the disclosure. 
     Operations  1101   a  to  1101   c  are the same as operations  801   a  to  801   c  in the embodiment of  FIG.  8   . 
     In operation  1101   a , a UE  1111  transmits a UE-originated location information request (mobile originated location request) message to an AMF  1113 . 
     In operation  1101   b , a (R)AN  1112  transmits a base station induced location information request (RAN induced location request) message to the AMF  1113 . 
     In operation  1101   c , a GMLC or NEF  1115  transmits a UE terminated location information request (mobile terminated location request) message to the AMF  1113 . 
     In operation  1102 , in the case in which an RRC inactive state is applied to the NG-RAN  1112 , the AMF  1113  transmits a recommendation for RRC configuration update. 
     As described above, Equation 7 is given as D+S+P&lt;=R. 
     In operation  1102 , the AMF  1113  calculates a D value based on a P value, an R value, and an S value in Equation 7. Specifically, the AMF  1113  obtains the time (P of Equation 7) spent on UE location measurement. In addition, in operations  1101   a  to  1101   c , the AMF  1113  obtains a location information service response time (R in Equation 7) included in location information request service quality information included in the received location measurement request. The AMF  1113  obtain a service request performing time (S in Equation 7) that is set and stored in the AMF  1113 , that is, the time spent on performing a state change procedure in which the UE  1111  is changed from an RRC inactive state to an RRC active state. Based on the P value, R value, and S value in Equation 7, the AMF  1113  calculates a DRX cycle length value (D in Equation 7) that satisfies Equation 7. 
         D+S′+P&lt;=R   Equation 9
 
     D in Equation 9 is a set DRX cycle. S′ is the time while the UE  1111  spends on a state change from an RRC inactive state to an RRC active state. P is the time spent on a UE positioning procedure, that is, the time spent on UE positioning related measurement and calculation of an expected location. R is a required response time. 
     In operation  1103 , the AMF  1113  transmits a RAN configuration update (update RAN configuration) message to the (R)AN  1112 . According to an embodiment, the RAN configuration update message includes an RRC configuration update indicator. The AMF  1113  transmits an N2 message that corrects a RAN configuration to the RAN  1112 . The N2 message includes a DRX parameter of which a configuration needs to be changed in the RAN configuration information. The DRX parameter includes an idle mode DRX cycle. 
     In operation  1104 , an RRC re-configuration is performed. For example, RRC reconfiguration applied in an RRC inactive state is performed. The RAN  1112  receives a message that changes a configuration of the RAN configuration. A message that changes a configuration of the RAN configuration may include a DRX parameter, and the DRX parameter may include an idle model DRX cycle. The RAN  1112  changes a configuration for the set value of an idle mode DRX cycle applied in the RRC inactive state. In order to change the configuration of the UE  1111 , the RAN  1112  performs an RRC re-configuration procedure. 
     In operation  1105 , the (R)AN  1112  transmits, to the AMF  1113 , a RAN configuration update acknowledgement (update RAN configuration ACK) message. The RAN node  1112  that successfully performs the RRC re-configuration reports, to the AMF  1113 , that a RAN configuration is successfully changed. The message reporting that a RAN configuration is changed may include re-set DRX parameters. The DRX parameter may include a newly set idle mode DRX parameter. 
     In operation  1106   a , the AMF  113  stores an updated RAN mode (the update RAN mode). The AMF  1113  stores the reset DRX parameters. When DRX parameter configuration is successfully completed, the AMF  1113  stores the state associated with a low-latency response RRC mode together with the DRX parameter reset for the UE  1111 . The stored DRX parameter and the low-latency response RRC mode state may be used by the AMF  1113  during a movement procedure. When a new AMF performs a registration procedure for the UE  1111 , a DRX parameter included in the context of the UE that a previous AMF stores and a response RRC mode state are transmitted to the new AMF. Based on the context information stored in relation to the DRX parameter of the UE  1111 , the response RRC mode state, and a location information request, the new AMF may determine whether to perform an RRC configuration update on a new RAN. In the case in which the new AMF determines an RRC configuration, a RAN configuration information update procedure may be performed according to procedures 3 to 5 in the embodiment. 
     In operation  1106   b , the AMF  1113  transmits a Nudm SDM Info service message to the UDM  1114 . The AMF  1113  may store, in the UDM  1114 , the state related to processing of a location information request associated with the UE  1111 , a successfully set DRX parameter, and the state associated with a low-latency response RRC mode. 
     Embodiment 5 
       FIG.  12    is a diagram illustrating a process of restoring an existing DRX cycle to an original value after successfully completing a UE location information service in a wireless communication system according to various embodiments of the disclosure. 
     A DRX parameter restoration procedure may be performed even when a UE  1211  in the idle state (a CM-IDLE state or an RRC inactive) does not need to be promptly changed to a connected state (CM-CONNECTED or RRC connected) any longer due to the movement of the UE  1211 . After performing a location information service or detecting a change of the location information of the UE  1211 , an AMF  1213  performs a procedure of restoring a DRX cycle to the value of a previous DRX cycle that was used before the DRX parameter of the UE  1211  is corrected, that is, performs a UE configuration update procedure. 
     To implement the embodiment of  FIG.  12   , the AMF stores an existing DRX parameter in a UE context in operation  802  of the embodiment of  FIG.  8   . Alternatively, in operation  903  of the embodiment of  FIG.  9    or operation  1003  of the embodiment of  FIG.  10   , or operation  1102  of the embodiment of  FIG.  11   , the AMF stores an existing DRX parameter in a UE context. 
     Operations  1201   a  to  1201   d  correspond to a triggering condition for performing operation  1203 . An AMF  1213  detects a change of the location information of a UE  1211 . Operations  1201   a  to  1201   d  corresponds to a procedure for triggering a procedure of a restoring DRX parameter configuration information in operation  1203 , due to a change of the location of the UE. 
     In operation  1201   a , a (R)AN  1212  transmits a handover completion message to the AMF  1213 . In an N2/Xn handover procedure, the AMF  1213  detects a change of the location of the UE  1211 . 
     In operation  1201   b  the (R)AN  1212  transmits an NG-RAN location information report (NG-RAN location report) message to the AMF  1213 . Via NG-RAN location reporting, the AMF  1213  detects a change of the location of the UE  1211 . 
     In operation  1201   c , the (R)AN  1212  transmits a location information report using an LMC (location report using LMC) to the AMF  1213 . After performing an LMC-based UE positioning procedure, the RAN  1212  or the LMC transfers the location information of the UE  1211  to the AMF  1213 . 
     In operation  1201   d , a UDM  1214  transmits a positioning response (location determination response) message to the AMF  1213 . After performing the UE positioning procedure of an LMF, the LMF transfers the location information of the UE  1211  to the AMF  1213 . 
     Operations  1202   a  to  1202   c  correspond to a triggering condition for performing operation  1203 . 
     In operation  1202   a , the AMF  1213  transmits a location information response (location response) message to the UE  1211 . 
     In operation  1202   b , the AMF  1213  transmits a location information response (location response) message to the (R)AN  1212 . 
     In operation  1202   c , the AMF  1213  transmits a location information response (location response) message to a GMLC or NEF  1215  or an AF. 
     In the case in which the AMF  1213  performs a UE location information obtaining procedure in response to a location information request such as operations  801   a  to  801   c  of the embodiment of  FIG.  8   , the AMF  1213  transfers UE location information to an entity that requests the UE location information, for example, the UE  1211 , the base station  1212 , the GMLC or the NEF  1215 , or the AF. 
     In the case in which the AMF  1213  transmits a message that indicates completion of performing associated with the UE location information request in response to the request, in the case in which the AMF  1213  transmits a UE location information report message, or in the case in which the AMF  1213  determines that a quick location information service is not needed any longer, operation  1203  of the AMF  1213  is triggered. 
     In operation  1203 , the AMF  1213  detects whether the location of the UE  1211  is changed or whether the UE  1211  leaves a location area (detect UE location is changed and UE moved out of location area), and determines to re-store a DRX configuration (decide to re-store the DRX configuration). 
     Due to the movement of the UE  1211  such as operations  1201   a  to  1201   d , the AMF  1213  determines that the low-latency location information service is not needed in the area from which the UE  1211  leaves in operation  1203 . Alternatively, due to completion of the location information service such as operations  1202   a  to  1202   c , the AMF  1213  determines that the low-latency location information service is not needed any longer in operation  1203 . 
     To perform the embodiment of  FIG.  12   , an AMF stores an existing DRX parameter in a UE context in operation  802  of the embodiment of  FIG.  8   . Alternatively, in operation  903  of the embodiment of  FIG.  9    or operation  1003  of the embodiment of  FIG.  10   , or operation  1102  of the embodiment of  FIG.  11   , an AMF stores an existing DRX parameter in a UE context. 
     The AMF  1213  performs a UE configuration update procedure in operations  1204  to  1210  in order to restore a previous DRX parameter configuration that was stored in the UE context. 
     Alternatively, the AMF  1213  includes a DRX parameter in a message for changing a RAN configuration of operation  1207  and transmits the same to the RAN node  1212 , in order to restore a previous DRX parameter configuration that was stored in the UE context. 
     Subsequently, in operations  1204  to  1210 , a UE configuration update procedure is performed. In operations  1204  to  1210 , the AMF  1213  restores the DRX cycle of the UE  1211  to an original value via the UE configuration update procedure. 
     In operation  1204 , the AMF  1213  transmits a UE configuration update command message to the UE  1211 . According to an embodiment, the UE configuration update command message may include DRX parameters, an indication of re-registration, and the like. In operation  1204 , the AMF  1213  performs the same procedure as operation  803  in the embodiment of  FIG.  8   . 
     In operation  1205 , the UE  1211  transmits a UE configuration update complete message to the AMF  1213 . In operation  1205 , the AMF  1213  performs the same procedure as operation  804  in the embodiment of  FIG.  8   . 
     In operation  1206 , the AMF  1213  transmits a Nudm SDM Info service message to the UDM  1214 . In operation  1206 , the AMF  1213  performs the same procedure as operation  805  in the embodiment of  FIG.  8   . 
     In operation  1207 , the AMF  1213  transmits a RAN update (update RAN) message to the (R)AN  1212 . In operation  1207 , the AMF  1213  performs the same procedure as operation  806  in the embodiment of  FIG.  8   . 
     In operation  1208 , the UE  1211  decides to re-configure a DRX parameter. In operation  1208 , the AMF  1213  performs the same procedure as operation  807  in the embodiment of  FIG.  8   . 
     In operation  1209 , the UE  1211  transmits a registration request message to the AMF  1213 . According to an embodiment, the registration request message includes DRX parameters. In operation  1209 , the AMF  1213  performs the same procedure as operation  808  in the embodiment of  FIG.  8   . 
     In operation  1210 , the AMF  1213  transmits a registration accept message to the UE  1211 . According to an embodiment, the registration accept message includes an accepted DRX parameter. In operation  1210 , the AMF  1213  performs the same procedure as operation  809  in the embodiment of  FIG.  8   . 
     Embodiment 6 
       FIG.  13    is a diagram illustrating a process in which an AMF updates a DRX parameter according to movement of a UE in a wireless communication system according to various embodiments of the disclosure. 
     In the embodiment of  FIG.  13   , a registration request message that the UE  1311  transmits triggers the AMF  1313  to update a DRX parameter. 
     The AMF  1313  receives a registration request message from the UE  1311 , and detects that the location of the UE is changed. When the AMF  1313  determines that the UE  1311  is currently in the state in which a DRX parameter for a low-latency location service is adjusted and the current location of the UE is in a location that does not require low-latency requirement, the AMF  1313  determines restoration of the DRX parameter. 
     When the AMF  1313  determines that the UE  1311  is currently in the state in which a DRX parameter for a low-latency location service is adjusted and the current location of the UE is in a location that does not require low-latency requirement, and a response of a low-latency location service is not present that is performed periodically, delayed, pending, or triggered by a change of the location of the UE, the AMF  1313  determines the restoration of the DRX parameter. The AMF  1313  that determines restoration of the DRX parameter determines to update a UE configuration (UE configuration update) or determines to change a DRX parameter configuration in the RAN  1312  and performs the same. 
     In operation  1301 , the UE  1311  transmits a registration request message to the (R)AN  1312 . According to an embodiment, the registration request message of operation  1301  includes a DRX parameter. The UE  1311  transfers the registration request message to the RAN  1312 . In order to request updating a DRX parameter, the registration request message may include the value of a DRX parameter with which a DRX parameter desires to be updated. 
     In operation  1302 , the (R)AN  1312  transmits a registration request message to the AMF  1313 . According to an embodiment, the registration request message of operation  1302  includes a DRX parameter and UE location information (UE location). The NR-RAN  1312  transfers, to the AMF  1313 , the registration request message together with the UE location information, for example, a cell ID, an NG-RAN node ID, or a tracking area. 
     In operation  1303 , the AMF  1313  detects whether the location of the UE  1311  is changed or whether the UE  1311  leaves a location area (detect UE location is changed and UE moved out of location area), and determines to re-store a DRX configuration (decide to re-store the DRX configuration). When receiving a UE registration message, the AMF  1313  detects that the location of the UE  1311  is changed. The AMF  1313  determines whether the UE leaves a location area requested by the location request, or a pending location request is present. The AMF  1313  determines whether it is a shorted DRX cycle mode. The AMF  1313  determines whether to restore a DRX cycle. 
     In operation  1304 , the AMF  1313  transmits a registration accept message to the UE  1311 . According to an embodiment, the registration accept message includes an accepted DRX parameter. In the case in which the AMF  1313  determines to restore a DRX cycle to an original value, the AMF  1313  sets a DRX parameter to be restored in the accepted DRX cycle, and transmits a registration response message to the UE  1311 . 
     In operation  1305 , the AMF  1313  transmits a RAN update (update RAN) message to the (R)AN  1312 . According to an embodiment, the RAN update message includes a DRX parameter. In the case in which the AMF  1313  determines restoration or change of a DRX parameter, the AMF  1313  transmits, to the RAN  1312 , a message that requests restoration of the value of a DRX parameter. 
     In operation  1306 , the AMF  1313  transmits a UE&#39;s DRX parameter update report message to a GMLC or the NEF  1314 . 
     The methods according to embodiments described in the claims or the specification of the disclosure may be implemented by hardware, software, or a combination of hardware and software. 
     When the methods are implemented by software, a computer-readable storage medium for storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium may be configured for execution by one or more processors within the electronic device. The at least one program may include instructions that cause the electronic device to perform the methods according to various embodiments of the disclosure as defined by the appended claims and/or disclosed herein. 
     The programs (software modules or software) may be stored in non-volatile memories including a random access memory and a flash memory, a read only memory (ROM), an electrically erasable programmable read only memory (EEPROM), a magnetic disc storage device, a compact disc-ROM (CD-ROM), digital versatile discs (DVDs), or other type optical storage devices, or a magnetic cassette. Alternatively, any combination of some or all of them may form a memory in which the program is stored. Further, a plurality of such memories may be included in the electronic device. 
     In addition, the programs may be stored in an attachable storage device which may access the electronic device through communication networks such as the Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), and Storage Area Network (SAN) or a combination thereof. Such a storage device may access the electronic device via an external port. Further, a separate storage device on the communication network may access a portable electronic device. 
     In the above-described detailed embodiments of the disclosure, an element included in the disclosure is expressed in the singular or the plural according to presented detailed embodiments. However, the singular form or plural form is selected appropriately to the presented situation for the convenience of description, and the disclosure is not limited by elements expressed in the singular or the plural. Therefore, either an element expressed in the plural may also include a single element or an element expressed in the singular may also include multiple elements. 
     Although specific embodiments have been described in the detailed description of the disclosure, various modifications and changes may be made thereto without departing from the scope of the disclosure. Therefore, the scope of the disclosure should not be defined as being limited to the embodiments, but should be defined by the appended claims and equivalents thereof. 
     INDUSTRIAL APPLICABILITY 
     The disclosure generally relates to a wireless communication system, and more particularly, to a method and an apparatus for providing a low-latency location information service in a wireless communication system.