Abstract:
The present disclosure relates to a communication technique that combines a 5G communication system for supporting a data rate that is higher than that of a beyond 4G system with IoT technology, and a system thereof. The present disclosure may be applied to intelligent services on the basis of 5G communication technology and IoT related technology, such as smart home, smart building, smart city, smart car or connected car, health care, digital education, retail, security and safety related services. 
     A method by a mobility management (MM) function entity is provided. The method includes receiving a message including session information for a terminal in an idle mode, transmitting a paging message for the terminal based on the message, receiving a service request message for the terminal from a base station, transmitting an interface configuration request message including the session information to the base station based on the session information, receiving an interface configuration response message from the base station, and transmitting information for configuring an interface between a user plane gateway (UP GW) corresponding to the session information and the base station.

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
       [0001]    This application claims the benefit under 35 U.S.C. §119(a) of a Korean patent application filed on Jul. 5, 2016 in the Korean Intellectual Property Office and assigned Serial number 10-2016-0085051, the entire disclosure of which is hereby incorporated by reference. 
       TECHNICAL FIELD 
       [0002]    The present disclosure relates to vehicle-to-everything (V2X) technology using a mobile communication network. More particularly, the present disclosure relates to V2X communication technology through all interfaces with vehicles. V2X has vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), and vehicle-to-pedestrian (V2P), which respectively mean vehicle-to-vehicle communication, vehicle-to-communication network/infrastructure communication, and vehicle-to-pedestrian communication. 
       BACKGROUND 
       [0003]    In a mobile communication network, a vehicle-to-everything (V2X) service takes aim at wireless network construction for effectively transferring information that is transmitted and received through a vehicle to prevent an accident, to improve driving convenience, and to increase energy saving and traffic efficiency. 
         [0004]    Further, according to the present disclosure, if a terminal does not have a subscriber identification module (SIM) profile like an open market oriented terminal having an embedded SIM (eSIM) mounted thereon, it is necessary for the terminal to download the SIM profile through attaching to an eSIM server, for example, a subscription manager data preparation plus (SM-DP+) or a subscription manager discovery service (SM-DS), in order to receive a normal cellular network service that is provided by a mobile network operator (MNO). However, there is a need for schemes to provide to a terminal packet data network (PDN) connectivity or packet data unit (PDU) connectivity for attaching to an eSIM server through a cellular network. 
         [0005]    Further, the present disclosure relates to a method for a terminal to resume data communication in a mobile communication system that supports network slices. 
         [0006]    To meet the demand for wireless data traffic having increased since deployment of 4 th  generation (4G) communication systems, efforts have been made to develop an improved 5 th  generation (5G) or pre-5G communication system. Therefore, the 5G or pre-5G communication system is also called a ‘Beyond 4G Network’ or a ‘Post long term evolution (LTE) System’. The 5G communication system is considered to be implemented in higher 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, the beamforming, massive multiple-input multiple-output (MIMO), full dimensional MIMO (FD-MIMO), array antenna, an 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 (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 frequency shift keying (FSK) and quadrature amplitude modulation (QAM) (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 been developed. 
         [0007]    The Internet, which is a human centered connectivity network where humans generate and consume information, is now evolving to the internet of things (IoT) where distributed entities, such as things, exchange and process information without human intervention. The internet of everything (IoE), which is a combination of the IoT technology and the Big Data processing technology through connection with a cloud server, has emerged. As technology elements, such as “sensing technology,” “wired/wireless communication and network infrastructure,” “service interface technology,” and “Security technology” have been demanded for IoT implementation, a sensor network, a machine-to-machine (M2M) communication, machine type communication (MTC), and so forth have been recently researched. Such an IoT environment may provide intelligent Internet technology services that create a new value to human life by collecting and analyzing data generated among connected things. IoT may be applied to a variety of fields including smart home, smart building, smart city, smart car or connected cars, smart grid, health care, smart appliances and advanced medical services through convergence and combination between existing information technology (IT) and various industrial applications. 
         [0008]    In line with this, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as a sensor network, MTC, and M2M communication may be implemented by beamforming, MIMO, and array antennas. Application of a cloud RAN as the above-described Big Data processing technology may also be considered to be as an example of convergence between the 5G technology and the IoT technology. 
         [0009]    The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the present disclosure. 
       SUMMARY 
       [0010]    Aspects of the present disclosure are to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the present disclosure is to provide two kinds of methods for transmitting a vehicle-to-everything (V2X) service in a long term evolution (LTE) network. First is a method for directly transferring data between terminals through device-to-device (D2D) communication using a PC5 interface, and second is a method for transferring data through terminal-to-base station communication using an LTE-Uu interface. The terminal may determine whether to transmit V2X data to a PC5 or an LTE-Uu based on information that is configured by the base station. The base station should determine whether to use the PC5, the LTE-Uu, or both of them in order to transmit the V2X data to the terminal. The present disclosure proposes a method for configuring a base station so that the base station can use the LTE-Uu if the base station is connected to a local network for the V2X service. 
         [0011]    Further, in an aspect of the present disclosure, a local network connection in a V2X structure is not limited to one base station, but several adjacent base stations may share one local network. In the case of using a local network connection in the current 3 rd  generation partnership project (3GPP) standard, handover is not supported, whereas in the case where several adjacent base stations share one local network, it is possible to reduce time that is consumed for a terminal to newly make a connection in a state where a local handover is supported. Accordingly, the present disclosure proposes schemes for handover support of a local network connection in a corresponding area if adjacent base stations share one local network. 
         [0012]    Further, if a terminal does not have a subscriber identification module (SIM) profile like an open market oriented terminal having an embedded SIM (eSIM) mounted thereon, it is necessary for the terminal to download the SIM profile through attaching to an eSIM server, for example, a subscription manager data preparation plus (SM-DP+) or a subscription manager discovery service (SM-DS), in order to receive a normal cellular network service. However, there is a need for schemes to provide to the terminal packet data network (PDN) connectivity or packet data unit (PDU) connectivity for attaching to the eSIM server through a cellular network. In the related art, a terminal having no SIM profile may acquire the connectivity through a Wi-Fi network or a tethering method. However, the terminal is unable to have the connectivity in a situation where there is no pre-connected connectivity. Further, in the case where a terminal manufacturer sells a terminal after a provisioning profile that is provided by the manufacturer is pre-stored in an eSIM, there may be a method for acquiring a limited connectivity in a cellular network through the provisioning profile, downloading the SIM profile from the eSIM server through the acquired connectivity, and receiving a cellular network service through the downloaded SIM profile. However, this method may cause the problem that the terminal price is increased. 
         [0013]    Another aspect of the present disclosure is to provide schemes for a terminal that is mounted with an eSIM having no SIM profile to acquire PDN connectivity or PDU connectivity through a cellular network. 
         [0014]    Another aspect of the present disclosure is to provide a method for performing network reconnection so as to efficiently operate wireless resources and network resources of a mobile communication system that supports network slices if a terminal configures reconnection to the mobile communication system for transition from an idle state to a connected state. 
         [0015]    In accordance with an aspect of the present disclosure, a method by a mobility management (MM) function entity is provided. The method includes receiving a message including session information for a terminal in an idle mode, transmitting a paging message for the terminal based on the message, receiving a service request message for the terminal from a base station, transmitting an interface configuration request message including the session information to the base station based on the session information, receiving an interface configuration response message from the base station, and transmitting information for configuring an interface between a user plane gateway (UP GW) corresponding to the session information and the base station. 
         [0016]    In accordance with another aspect of the present disclosure, a mobility management (MM) function entity is provided. The MM function entity includes a transceiver configured to transmit and receive signals, and at least one processor configured to receive a message that includes session information for a terminal in an idle mode, transmit a paging message for the terminal based on the message, receive a service request message for the terminal from a base station, transmit an interface configuration request message including the session information to the base station based on the session information, receive an interface configuration response message from the base station, and transmit information for configuring an interface between a user plane gateway (UP GW) corresponding to the session information and the base station. 
         [0017]    In accordance with another aspect of the present disclosure, a method for operating a session management (SM) function entity is provided. The method includes receiving information indicating that there is data to be transmitted from a user plane gateway (UP GW) to a terminal in an idle mode, transmitting an interface configuration request message including session information for the terminal to a mobility management (MM) function entity, and receiving from the MM function entity an interface configuration response message including information for configuring an interface between the UP GW that corresponds to the session information and a base station. 
         [0018]    In accordance with another aspect of the present disclosure, a session management (SM) function entity is provided. The SM function entity includes a transceiver configured to transmit and receive signals, and at least one processor configured to receive information indicating that there is data to be transmitted from a user plane gateway (UP GW) to a terminal in an idle mode, transmit an interface configuration request message including session information for the terminal to a mobility management (MM) function entity, and receive from the MM function entity an interface configuration response message including information for configuring an interface between the UP GW that corresponds to the session information and a base station. 
         [0019]    According to the present disclosure, V2X data should satisfy low latency and reliability. Accordingly, in order for a V2X terminal to transfer a V2X message that satisfies the low latency and reliability, a base station may configure a transmission path that is advantageous to send the V2X data to the terminal. For example, if the base station is not connected to a local network for V2X, it may configure a V2X data path to use only PC5. If the base station is connected to the local network for the V2X, it may configure the V2X data path to use an LTE-Uu. 
         [0020]    Further, according to the present disclosure, a connection to the local network does not support mobility between base stations (handover is not supported). Since base stations that share one local network through the present disclosure are able to support handover for the local network connection between base stations, a terminal may continuously use the V2X service without the necessity of releasing the existing connection and performing reconnection. 
         [0021]    Further, in the related art, a terminal having no SIM profile may acquire the connectivity through a Wi-Fi network or a tethering method. However, the terminal is unable to have the connectivity in a situation where there is no pre-connected connectivity. Further, in the case where a terminal manufacturer sells a terminal after a provisioning profile that is provided by the manufacturer is pre-stored in an eSIM, there may be a method for acquiring a limited connectivity in the cellular network through the provisioning profile, downloading the SIM profile from an eSIM server through the acquired connectivity, and receiving a cellular network service through the downloaded SIM profile. However, this method may cause the problem that the terminal price is increased. According to the present disclosure, a terminal that is mounted with the eSIM having no SIM profile can acquire the PDN connectivity or the PDU connectivity for provisioning of the SIM profile through the cellular network, and thus it becomes possible for the terminal to use a normal cellular service through provisioning of the SIM profile through the cellular network itself without using any other connectivity. 
         [0022]    Further, according to the present disclosure, the terminal can perform the network reconnection that considers the network slices through which data communication is to be resumed during performing of the network reconnection, and thus the wireless resources and the network resources can be efficiently operated. 
         [0023]    Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the present disclosure. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0024]    The above and other aspects, features, and advantages of certain embodiments of the present disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which: 
           [0025]      FIG. 1A  is a diagram illustrating the structure of a mobile communication network in which a local network for a vehicle-to-everything (V2X) service is constructed according to an embodiment of the present disclosure, 
           [0026]      FIG. 1B  is a diagram illustrating a procedure in which a base station configures a V2X data transmission path of a terminal with information based on a local network construction for a V2X service, and the terminal accesses the local network according to an embodiment of the present disclosure, 
           [0027]      FIG. 1C  is a diagram illustrating a procedure of maintaining connectivity of a local network through a handover procedure between base stations if several base stations are connected to one local network according to an embodiment of the present disclosure, 
           [0028]      FIG. 1D  is a diagram illustrating the structure of a terminal according to an embodiment of the present disclosure, 
           [0029]      FIG. 1E  is a diagram illustrating the structure of a base station according to an embodiment of the present disclosure, 
           [0030]      FIG. 1F  is a diagram illustrating the structure of a control function according to an embodiment of the present disclosure, 
           [0031]      FIG. 1G  is a diagram illustrating the structure of a local gateway according to an embodiment of the present disclosure, 
           [0032]      FIG. 2A  is a diagram illustrating the structure of a network in which a terminal that is mounted with an embedded subscriber identification module (eSIM) performs subscriber identification module (SIM) profile provisioning according to an embodiment of the present disclosure, 
           [0033]      FIGS. 2B-1 and 2B-2  are diagrams illustrating network connection schemes for a terminal that is mounted with an eSIM to perform initial provisioning according to various embodiments of the present disclosure, 
           [0034]      FIGS. 2C-1 and 2C-2  are diagrams illustrating network connection schemes for a terminal that is mounted with an eSIM to perform initial provisioning according to various embodiments of the present disclosure, 
           [0035]      FIGS. 2D-1 and 2D-2  are diagrams illustrating network connection schemes for a terminal that is mounted with an eSIM to perform initial provisioning in consideration of an ID security according to various embodiments of the present disclosure, 
           [0036]      FIG. 2E  is a diagram illustrating the structure of a terminal according to an embodiment of the present disclosure, 
           [0037]      FIG. 2F  is a diagram illustrating the structure of a mobility management entity (MME) according to an embodiment of the present disclosure, 
           [0038]      FIG. 2G  is a diagram illustrating the structure of a gateway according to an embodiment of the present disclosure, 
           [0039]      FIG. 3A  is a diagram illustrating an example of a network structure of a wireless communication system according to an embodiment of the present disclosure, 
           [0040]      FIG. 3B  is a diagram illustrating an example of a network structure of a wireless communication system to which network slices are applied according to an embodiment of the present disclosure, 
           [0041]      FIG. 3C  is a diagram illustrating an idle state entrance procedure of a terminal in a wireless communication system according to an embodiment of the present disclosure, 
           [0042]      FIG. 3D  is a diagram illustrating a network reconnection procedure after paging of a terminal in a wireless communication system according to an embodiment of the present disclosure, 
           [0043]      FIG. 3E  is a diagram illustrating a network reconnection procedure of a terminal in a wireless communication system to which network slices are applied according to an embodiment of the present disclosure, 
           [0044]      FIG. 3F  is a diagram illustrating a network reconnection procedure of a terminal according to an embodiment of the present disclosure, 
           [0045]      FIG. 3G  is a diagram illustrating a network reconnection procedure of a terminal according to another embodiment of the present disclosure, 
           [0046]      FIG. 3H  is a diagram illustrating the structure of a terminal according to an embodiment of the present disclosure, 
           [0047]      FIG. 3I  is a diagram illustrating the structure of a base station according to an embodiment of the present disclosure, 
           [0048]      FIG. 3J  is a diagram illustrating the structure of a mobility management (MM) function according to an embodiment of the present disclosure, and 
           [0049]      FIG. 3K  is a diagram illustrating the structure of a session management (SM) function according to an embodiment of the present disclosure. 
       
    
    
       [0050]    Throughout the drawings, like reference numerals will be understood to refer to like parts, components, and structures. 
       DETAILED DESCRIPTION 
       [0051]    The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness. 
         [0052]    The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Accordingly, it should be apparent to those skilled in the art in that the following description of various embodiments of the disclosure is provided for illustration purpose only and not for the purpose of limiting the present disclosure as defined by the appended claims and their equivalents. 
         [0053]    It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “a component surface” includes reference to one or more of such surfaces. 
         [0054]    Hereinafter, the operation principle according to preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The same reference numerals even in different drawings denote the same constituent elements indicated in the drawings. In describing the present disclosure below, related well-known functions or configurations incorporated herein are not described in detail in the case where it is determined that they obscure the subject matter of the present disclosure in unnecessary detail. Further, terms to be described later are terms defined in consideration of their functions in the present disclosure, but may differ depending on intentions of a user and an operator or customs. Accordingly, they should be defined on the basis of the contents of the whole description of the present disclosure. 
         [0055]    The present disclosure may have various modifications and embodiments, and specific embodiments will be described in detail with reference to the drawings. However, this is not intended to limit the present disclosure to the specific embodiments, but it should be understood that the present disclosure includes all changes, equivalents, and substitutions that are included in the spirit and technical scope of the present disclosure. 
         [0056]    Further, although the terms including ordinals, such as “first, second, and so forth”, are used to describe diverse constituent elements, the above-described constituent elements are not limited by the terms. The terms may be used only to discriminate a constituent element from other constituent elements. For example, without departing from the scope of the present disclosure, a first constituent element may be called a second constituent element, and similarly, a second constituent element may be called a first constituent element. The term “and/or” includes a combination of a plurality of described items or any one of a plurality of described items. 
         [0057]    Further, the terms used in the description are merely for explaining specific embodiments of the present disclosure, but do not intend to limit the scope of the present disclosure. A singular expression may include a plural expression unless specially described. It should be understood that the term “includes” or “has” used in the description is to designate the existence of features, figures, operations, constituent elements, components, or combinations thereof, and does not pre-exclude the existence or addition of one or more other features, figures, operations, constituent elements, components or combinations thereof. 
         [0058]    Further, in embodiments of the present disclosure, unless specially defined, all terms (including technical and scientific terms) used in the description could be used as meanings commonly understood by those ordinary skilled in the art to which the present disclosure belongs. The terms that are generally used and are defined in the dictionary are to be interpreted as meanings that coincide with the contextual meanings of related technology, but are not interpreted ideally or excessively unless they have been clearly defined. 
       First Embodiment 
       [0059]    In order to meet a wireless data traffic demand that is on an increasing trend after commercialization of the 4 th  generation (4G) communication system, efforts for developing improved 5 th  generation (5G) communication system or pre-5G communication system have been made. For this reason, the 5G communication system or pre-5G communication system has been called beyond 4G network communication system or post long term evolution (LTE) system. 
         [0060]    Vehicle-to-everything (V2X) is an example of a transport means that is located on a road, and means a concrete communication technology for implementing “connected vehicle” or “networked vehicle” which is a general term that calls all communication types that can be applied to a vehicle. V2X networking is briefly divided into three kinds of communications, that is, vehicle-to-infrastructure (V2I), vehicle-to-vehicle (V2V), and vehicle-to-pedestrian (V2P) communications. 
         [0061]    V2I and V2V technology has been developed to take aim at improvement of road safety, and in recent several years, it has been grafted on the development of wireless communication technology to cause various information technology (IT) additional services to be considered in addition to the initial safety-related use case. In principle advanced countries of telematics/ITS technologies, such as European Union, North America, Japan, and Korea, effectiveness and applicability of the technologies have been verified through large-scale projects over several years. 
         [0062]    According to such tendency, the 3 rd  generation partnership project (3GPP) group is proceeding with a standardization work for providing V2X communication based on LTE-Advanced. The service aspects (SA) group has defined requirements to be achieved during the V2X communication, and has agreed to utilize device-to-device (D2D) search and communication functions that are applied to a system after LTE Rel-12 for the V2V and V2P communications. 
         [0063]    Further, during the V2I communication, it has been considered to communicate with a base station (or enhanced node B (eNB)) or a road-side-unit (RSU) which is communication equipment that is installed on a roadside by a network service provider. In this case, the RSU may be recognized as one of a base station and a terminal (or user equipment (UE)) with respect to surrounding vehicles. Accordingly, in the description of the present disclosure, an RSU type in the case where the RSU is recognized as an eNB may be defined as “eNB-type RSU,” and an RSU type in the case where the RSU is recognized as UE may be defined as “UE-type RSU.” During V2I communication between a vehicle and a UE-type RSU, in the same manner as the V2V and V2P communications, the existing D2D search and communication functions may be utilized. Further, during communication between a vehicle and an eNB or eNB-type RSU, the existing cellular up/down link transmission/reception-based communication technology may be utilized. 
         [0064]    Hereinafter, explanation will be made with respect to a method in which a base station configures a wireless interface (PC5 or LTE-Uu) to be used for V2X data transmission to a terminal in a mobile communication network that is constructed for a V2X service, and a method for providing service continuity to a local network connection for a V2X service of a terminal in the case where handover occurs between base stations that are connected to the same local network. 
         [0065]      FIG. 1A  is a diagram illustrating the structure that configures a local network for V2X in order to provide a V2X service in a mobile communication network according to an embodiment of the present disclosure. 
         [0066]    In V2X, low latency should be satisfied during data transmission. As a method for achieving low latency, a local gateway (L-GW) is put in a place that is near to a base station to be connected to a local server, and thus latency that occurs to transfer data in a network can be reduced. Accordingly, a V2X service provider may construct a local network for connecting a local V2X application server to a base station in a specific area. 
         [0067]    Referring to  FIG. 1A , a V2X application server  1   a - 50  may be an entity neighboring a local GW (L-GW)  1   a - 40  or a co-located entity. The V2X application server  1   a - 50  is connected to a V2X application server that manages the whole V2X service in a specific country or region, that is, a macro V2X application server, and performs synchronization between data that is transmitted or received by terminals  1   a - 11  and  1   a - 12  and states of the terminals  1   a - 11  and  1   a - 12 . In the first embodiment of the present disclosure, the terminals  1   a - 11  and  1   a - 12  may be V2X-terminals or V2X-UE. 
         [0068]    Referring to  FIG. 1A , the L-GW  1   a - 40  is connected to several adjacent base stations  1   a - 21 ,  1   a - 22 , and  1   a - 23 . The base stations  1   a - 21 ,  1   a - 22 , and  1   a - 23  transmit a packet data network (PDN) connection that is established for V2X to the L-GW  1   a - 40 , and the L-GW  1   a - 40  transmits this to the V2X application server  1   a - 50 . The base station  1   a - 21  may be connected to at least one terminal  1   a - 11  and  1   a - 12 . Other base stations  1   a - 22  and  1   a - 23  may also be connected to other terminals. The base stations may be connected to one MM Entity (MME)  1   a - 30 , or may be connected to different MMEs. In the case where the present disclosure is applied to a new radio (NR) system, the MME  1   a - 30  may be called a control function. The control function may be composed of a MM function and a session management (SM) function. The MM function may perform MM of the terminals  1   a - 11  and  1   a - 12 , and may be connected to the base stations  1   a - 21 ,  1   a - 22 , and  1   a - 23  to transfer a control signal related to the MM to the terminals  1   a - 11  and  1   a - 12 . The SM function may manage a session in which the terminals  1   a - 11  and  1   a - 12  can perform a service through a data network, and may be connected to a user plane GW (UP GW) to manage data for the terminals  1   a - 11  and  1   a - 12 . 
       Embodiment 1-1 
       [0069]      FIG. 1B  is a diagram illustrating a procedure in which a base station configures a V2X data transmission path of a terminal with information based on a local network construction for a V2X service, and the terminal accesses the local network according to an embodiment of the present disclosure. 
         [0070]    Referring to  FIG. 1B , a system according to an embodiment of the present disclosure may include a terminal  1   b - 10 , a base station  1   b - 20 , an MME  1   b - 30 , an L-GW  1   b - 40 , and a V2X application server  1   b - 50 . The MME may be called a control function, and the control function may include an MM function and an SM function. The application server may be a V2X application server. In the following embodiment, for convenience in explanation, the term “MME” is used, but the term and concept “control function” may be used instead of the MME. In the case of applying the control function, management of a control plane may be performed by the MM function, and management of a user plane may be performed by the SM function. 
         [0071]    The base station  1   b - 20  may determine connectivity with the L-GW  1   b - 40  for a V2X service connected to the base station itself. When the base station  1   b - 20  makes S1 connection to the MME  1   b - 30 , it may provide to the MME  1   b - 30  information of the L-GW  1   b - 40  for the V2X service connected to the base station itself or L-GW connection capability information. As the result, the base station  1   b - 20  and the MME  1   b - 30  may determine that the corresponding base station has been connected to the local network for the V2X. It is assumed that the base station  1   b - 20  and the L-GW  1   b - 40  are in a connected state through the above-described method at  1   b - 61 . 
         [0072]    The terminal  1   b - 10  attempts a connection to the base station  1   b - 20 , and this follows a radio access procedure (e.g., a resource access channel (RACH) procedure) that is defined in the 3GPP standard, at  1   b - 63 . Through this process, the terminal  1   b - 10  may notify the base station  1   b - 20  that the terminal is a terminal that uses the V2X service through a radio resource control (RRC) message. Through this process, the base station notifies the terminal of a V2X data path that the base station can provide. This may be contained in system information  1   b - 65  that the base station  1   b - 20  broadcasts to the terminal  1   b - 10 . The system information may include information indicating that the path for V2X is an LTE-Uu (e.g., information such as LTE-Uu for V2X), and L-GW information (e.g., L-GW ID) for a V2X service. Further, the base station  1   b - 20  may notify the terminal  1   b - 10  that performs a radio access of an interface that can be used for V2X data transmission through the RRC message  1   b - 67 . The RRC message may include information indicating that the path for V2X is an LTE-Uu (e.g., information such as LTE-Uu for V2X), and L-GW ID for a V2X service. The RRC message may be a response to the RRC message for the terminal  1   b - 10  to request resources for V2X. 
         [0073]    As described above, a “usable V2X data path” of which the base station  1   b - 20  notifies the terminal  1   b - 10  may indicate a data path for V2V. Accordingly, the terminal  1   b - 10  may utilize configuration information for V2V message transmission, and may transmit data through a general LTE-Uu interface with respect to V2I or V2N. V2X data paths to be described below may mean data paths for V2V in all. 
         [0074]    Interfaces that the base station  1   b - 20  can provide to the terminal  1   b - 10  for the V2X data transmission may be a PC5 and an LTE-Uu. The PC5 is an interface for direct communication between terminals, and the LTE-Uu is an interface for communication between the terminal and the base station. Data through such interfaces is transferred up to a data network through a mobile communication network. The base station  1   b - 20  may independently indicate an interface that the terminal  1   b - 10  can use during transmission of data for V2X. In other words, the terminal  1   b - 10  may use the PC5 or LTE-Uu for the purposes other than V2X, and the base station  1   b - 20  may configure the terminal to exclusively use the PC5 and LTE-Uu for a V2X service independently from a case where the terminal uses them for the purposes other than the V2X. Accordingly, in an embodiment of the present disclosure, the base station specifies and transfers to the terminal usage of a PC5 interface for V2X and an LTE-Uu interface for V2X. That is, the base station  1   b - 20  may provide path information for V2X data transmission using SIB or RRC in a radio access procedure, and in the case of providing the path information, it may indicate that the provided path is a path for the V2X service. 
         [0075]    If the base station  1   b - 20  is not connected to the local network for V2X, it is unable to provide the V2X data of the terminal  1   b - 10  with low latency, and thus it may configure the terminal  1   b - 10  not to use the LTE-Uu interface for V2X. In this case, the base station  1   b - 20  may indicate that only PC5 is to be used as an interface for transmission of the V2X data (e.g., for V2X, PC5 only). In this case, the terminal  1   b - 10  recognizes that the interface that the base station  1   b - 20  provides for V2X is the PC5 only, is allocated with wireless resources for using the PC5 from the base station  1   b - 20 , and transfers data through the PC5 interface if V2X data transmission is needed. 
         [0076]    If the base station  1   b - 20  is connected to the V2X local network and does not operate the PC5 interface for communication with the terminal from the viewpoint of wireless resource management, the base station may indicate that the terminal  1   b - 10  should use only the LTE-Uu interface for V2X (e.g., for V2X, LTE-Uu only). In this case, the terminal  1   b - 10  recognizes that the interface that the base station  1   b - 20  provides for V2X is the LTE-Uu only. 
         [0077]    The base station  1   b - 20  may notify the terminal  1   b - 10  of the name of the local network that the terminal  1   b - 10  can use for a V2X service through the system information  1   b - 65  for notifying that the terminal  1   b - 10  should use an LTE-Uu interface or an RRC message  1   b - 67 . The base station  1   b - 20  may notify the terminal  1   b - 10  of L-GW information or local network information to which the base station itself is connected. This may be contained in the system information  1   b - 65  that the base station  1   b - 20  broadcasts to the terminal  1   b - 10 , or may be included in the RRC message that the base station  1   b - 20  sends to the terminal  1   b - 10 . The above-described information may be in the form of an IP address of an L-GW, an ID of an L-GW, or the name of a local network. The terminal  1   b - 10  has the IP address of the L-GW, the ID of the L-GW, or the name of the local network transferred from V2X server. The terminal  1   b - 10  that has received the information from the base station  1   b - 20  compares the received information with the information that the base station has, and if they coincide with each other, the terminal may determine that the corresponding base station  1   b - 20  is connected to the local network for V2X that the terminal  1   b - 10  intends to use. 
         [0078]    Thereafter, the terminal  1   b - 10  may identify the local network for V2X that is provided by the base station  1   b - 20 , and may request a PDN connection  1   b - 69  from the corresponding network. For this, in the case of requesting the PDN connectivity from a core network (CN) (MME), the terminal  1   b - 10  may include an access point name (APN) for a local V2X service or a general V2X service in the corresponding message. In the case of transferring a PDN connectivity request message that is sent by the terminal  1   b - 10  to the MME  1   b - 30 , the base station  1   b - 20  may use an initial UE message  1   b - 71 . In this case, the initial UE message to be transferred may include a transmission address of an L-GW for V2X that is connected to the base station itself. 
         [0079]    The MME  1   b - 30  that has received the initial UE message checks that the corresponding base station  1   b - 20  can use the L-GW  1   b - 40  for V2X, grasps the transmission address through which the base station  1   b - 20  transmits data to the corresponding L-GW, and checks whether an APN that is requested by the terminal  1   b - 10  is an APN for V2X through checking of a PDN connectivity request message that is sent by the terminal  1   b - 10 , at  1   b - 73 . Further, the MME  1   b - 30  checks whether the terminal is a terminal that can use the V2X service or a terminal that can access the local network for a V2X service through checking of subscription information of the corresponding terminal  1   b - 10 , at  1   b - 73 . 
         [0080]    The MME  1   b - 30 , which has checked that local network connection for V2X is permitted through the above-described processes, sends an initial UE context setup message  1   b - 75  to the base station  1   b - 20  in order to establish a bearer for a V2X local network connection of the terminal  1   b - 10 . This message may include quality of service (QoS) information and bearer ID for a data radio bearer (DRB) or an E-UTRAN radio access bearer (E-RAB) that should be established between the base station and the terminal, and a tunnel endpoint ID of the L-GW that will become an endpoint of the bearer. Further, the message may further include a correlation ID. Using the correlation ID, the MME  1   b - 30  may identify that the bearer to be established between the terminal  1   b - 10  and the base station  1   b - 20  is a bearer that is connected to the L-GW due to the information. 
         [0081]    The base station  1   b - 20  that has received the initial UE context setup message may determine that the V2X local network connection for the terminal  1   b - 10  has been permitted in view of the correlation ID. Accordingly, the base station  1   b - 20  establishes a local network connection to the L-GW  1   b - 40  for the terminal  1   b - 10 , which is connected from the L-GW up to the V2X application server  1   b - 50 , at  1   b - 77 . The V2X application server  1   b - 50  may be a local V2X application server that is connected to the L-GW  1   b - 40 , or a macro V2X application server that is directly connected to the L-GW  1   b - 40 . 
         [0082]    The base station  1   b - 20 , which has established the local network connection between the L-GW  1   b - 40  and the corresponding terminal  1   b - 10 , performs a procedure of establishing the terminal  1   b - 10  and a DRB, at  1   b - 79 . 
         [0083]    If the base station  1   b - 20  is connected to the V2X local network and operates a PC5 interface for direct communication with the terminal, it may indicate that the terminal  1   b - 10  should use a PC5 or an LTE-Uu as a V2X data transmission interface (e.g., for V2X, PC5, or LTE-Uu). 
         [0084]    In this case, the terminal  1   b - 10  should determine whether to send V2X data to be sent by the terminal itself to the PC5 or the LTE-Uu. The base station  1   b - 20  may notify the terminal  1   b - 10  of L-GW information or local network information to which the base station itself is connected. This may be contained in system information that the base station  1   b - 20  broadcasts to the terminal  1   b - 10 , or may be included in the RRC message that the base station sends to the terminal. The information may be in the form of an internet protocol (IP) address of an L-GW, an ID of the L-GW, or the name of a local network. The method for using the information is as described above. Therefore, the terminal  1   b - 10  has the IP address of the L-GW, the ID of the L-GW, or the name of the local network transferred from V2X server. The terminal  1   b - 10  that has received the information from the base station  1   b - 20  compares the received information with the information that the base station has, and if they coincide with each other, the terminal may determine that the corresponding base station  1   b - 20  is connected to the local network for V2X that the terminal  1   b - 10  intends to use. 
         [0085]    Thereafter, the terminal  1   b - 10  may identify the local network for V2X that is provided by the base station  1   b - 20 , and may request a PDN connection from the corresponding network. For this, in the case of requesting the PDN connectivity from a CN (MME), the terminal  1   b - 10  may include an APN for a local V2X service or a general V2X service in the corresponding message. In the case of transferring a PDN connectivity request message that is sent by the terminal  1   b - 10  to the MME  1   b - 30 , the base station  1   b - 20  may use an initial UE message. In this case, the initial UE message to be transferred may include a transmission address of an L-GW for V2X that is connected to the base station itself. 
         [0086]    The MME  1   b - 30  that has received the initial UE message checks that the corresponding base station  1   b - 20  can use the L-GW  1   b - 40  for V2X, grasps the transmission address through which the base station  1   b - 20  transmits data to the corresponding L-GW, and checks whether an APN that is requested by the terminal  1   b - 10  is an APN for V2X through checking of a PDN connectivity request message that is sent by the terminal  1   b - 10 . Further, the MME  1   b - 30  checks whether the terminal is a terminal that can use the V2X service or a terminal that can access the local network for a V2X service through checking of subscription information of the corresponding terminal  1   b - 10 . 
         [0087]    The MME  1   b - 30 , which has checked that local network connection for V2X is permitted through the above-described processes, sends an initial UE context setup message to the base station  1   b - 20  in order to establish a bearer for a V2X local network connection of the terminal  1   b - 10 . This message may include QoS information and bearer ID for a DRB or an E-RAB that should be established between the base station and the terminal, and a tunnel endpoint ID of the L-GW that will become an endpoint of the bearer. Further, the message may further include a correlation ID. Using the correlation ID, the MME  1   b - 30  may identify that the bearer to be established between the terminal  1   b - 10  and the base station  1   b - 20  is a bearer that is connected to the L-GW due to the information. 
         [0088]    The base station  1   b - 20  that has received the initial UE context setup message may determine that the V2X local network connection for the terminal  1   b - 10  has been permitted in view of the correlation ID. Accordingly, the base station  1   b - 20  establishes a local network connection to the L-GW  1   b - 40  for the terminal  1   b - 10 , which is connected from the L-GW up to the V2X application server  1   b - 50 . The V2X application server  1   b - 50  may be a local V2X application server that is connected to the L-GW  1   b - 40 , or a macro V2X application server that is directly connected to the L-GW  1   b - 40 . 
         [0089]    The base station  1   b - 20 , which has established the local network connection between the L-GW  1   b - 40  and the corresponding terminal  1   b - 10 , performs a procedure of establishing the terminal  1   b - 10  and a DRB. 
         [0090]    In the detailed embodiment, if the base station has configured both PC5 and LTE-Uu to be usable as data paths for V2X or V2V, the terminal should select one of two interfaces. The selection criteria of the terminal may follow the following embodiment. 
         [0091]    1. A physical layer of a terminal may grasp how many resource blocks are occupied through sensing of a PC5 interface. The physical layer may transfer this information to a media access control (MAC) layer, and the MAC layer may transfer this information to an upper layer that selects a data path for V2X data transmission. The terminal that has acquired PC5 interface sensing information of the physical layer may determine that many resource blocks are occupied on the PC5, and idle resource blocks are insufficient to send a V2X message or a V2V message to be sent by the terminal itself. In this case, the terminal may start message transmission through selection of an LTE-Uu interface in order to send the V2X message or the V2V message. 
         [0092]    2. If it is necessary for a terminal to transfer a V2X or V2V message in a situation where there is not a V2X local network to which the terminal itself is currently connected, the terminal selects a PC5 interface to transmit a message. 
         [0093]    3. A terminal may determine that there are many V2X or V2V messages that the terminal itself receives through the PC5. For example, if several V2X or V2V messages are received at an instance when a PC5 channel is once monitored, the terminal may determine that the PC5 channel is congested. In this case, the terminal starts V2X or V2V message transmission through selection of the LTE-Uu. 
       Embodiment 1-2 
       [0094]      FIG. 1C  is a diagram illustrating a procedure of maintaining connectivity of a local network through a handover procedure between base stations if several base stations are connected to one local network according to an embodiment of the present disclosure. 
         [0095]    Referring to  FIG. 1C , a system according to an embodiment of the present disclosure may include a terminal  1   c - 10 , a base station  1   c - 20 , an MME  1   c - 30 , an L-GW  1   c - 40 , and a V2X application server  1   c - 50 . The MME  1   c - 30  may be called a control function, and the control function may include an MM function and an SM function. The application server may be a V2X application server. In the following embodiment, for convenience in explanation, the term “MME” is used, but the term and concept “control function” may be used instead of the MME. In the case of applying the control function, management of a control plane may be performed by the MM function, and management of a user plane may be performed by the SM function. 
         [0096]    Embodiment 1-2 refers to a method for a network to provide a continuous local network connection to the terminal if the terminal  1   c - 10 , which is connected to a V2X local network to transmit and receive data, is handed over to an adjacent base station  1   c - 20 . This embodiment is based on the system structure illustrated in  FIG. 1A . 
         [0097]    Referring again to the structure of  FIG. 1A , a V2X local network is deployed in a specific area, several base stations are connected to the local network, and a terminal moves between the base stations. That is, the base stations may be connected to one L-GW, or the base stations that are connected to different L-GWs are connected to one V2X local network, that is, several L-GWs are connected to one local V2X application server. 
         [0098]    The existing L-GW connection does not support handover. That is, in the case of seceding from the range of a base station, a bearer that is connected to the L-GW should be released to be reestablished. However, embodiment 1-2 of the present disclosure proposes a method for supporting handover in a situation where several base stations are connected to one L-GW. 
         [0099]    Referring to  FIG. 1C , the terminal  1   c - 10  is connected to a V2X local network through a previous base station to transmit V2X data to the L-GW that is connected to the corresponding base station. It is assumed that the base station  1   c - 20  is connected to the L-GW  1   c - 40 , at  1   c - 61 . The terminal  1   c - 10  has been instructed by the previous base station to perform handover due to its location change or deteriorated coverage state, and thus the terminal has performed a handover procedure through wireless connection to the base station  1   c - 20 , at  1   c - 63 . 
         [0100]    It is assumed that the two base stations have already known as base stations that are connected to the L-GW  1   c - 40 . Accordingly, it may be notified that there has been a bearer connected to the L-GW  1   c - 40  through signaling between the base stations during the handover. 
         [0101]    The base station  1   c - 20  that has checked a wireless connection of the terminal  1   c - 10  may transmit a message  1   c - 65  notifying that the base station serves the terminal  1   c - 10  through the MME  1   c - 30 . For example, the base station  1   c - 20  may notify the MME  1   c - 30  that the corresponding terminal  1   c - 10  is serviced by the base station itself through sending of a path switch request. In this case, the base station  1   c - 20  may notify the MME  1   c - 30  of an evolved packet system (EPS) bearer ID that is handed over to the terminal, and may also notify the MME  1   c - 30  that this bearer is a bearer that is connected to the L-GW. Further, the base station  1   c - 20  may notify the MME  1   c - 30  of an ID of a V2X local network to which the base station  1   c - 20  is connected. Further, the base station  1   c - 20  may notify the MME  1   c - 30  of packet data network (PDN) session information or protocol data unit (PDU) session information. 
         [0102]    The MME  1   c - 30  that has received this may grasp that the base station  1   c - 20  is connected to the V2X local network. This can be known through the ID of the local network that is sent by the base station  1   c - 20  or an identifier that indicates connection to the L-GW  1   c - 40 . The MME  1   c - 30  determines whether the corresponding terminal has a connection authority to the V2X local network that is currently connected to the base station through determination of subscription information of the terminal handed over  1   c - 10 , at  1   c - 67 . Further, the MME may see an EPS bearer ID that is being used by the terminal, and may know whether the corresponding bearer is a bearer that is connected to the V2X local network and whether the base station can currently support this through checking of a message (e.g., path switch request) that is sent by the base station  1   c - 20 . Further, the MME may check whether the bearer is connected to the V2X local network using PDN session information or PDU session information, and whether the base station can currently support this. 
         [0103]    Thereafter, the MME  1   c - 30  may transmit a message that includes the checking result of  1   c - 67  to the base station  1   c - 20 . For example, the MME  1   c - 30  may transmit an ACK for the path switch request to the base station  1   c - 20 . The MME  1   c - 30  may configure the address of the L-GW to which the base station  1   c - 20  is connected with a correlation ID in the message, and may include the correlation ID in the corresponding ACK message  1   c - 69  to be transmitted. The correlation ID may be in the form of a tunneling endpoint ID for the L-GW  1   c - 40  of the V2X local network to which the base station is connected. The MME  1   c - 30  may determine whether the corresponding terminal  1   c - 10  is attached to the same local network with the correlation ID. This information may be used later to check whether the terminal is attached to the V2X local network, or whether the bearer is connected to the V2X local network, even during the handover occurrence. 
         [0104]    The base station  1   c - 20  that has received the ACK to the path switch request from the MME  1   c - 30  determines what L-GW  1   c - 40  it is connected to through seeing of the correlation ID that is included in the message. Further, the base station  1   c - 20  may perform a connection to the L-GW  1   c - 40  after determining whether the correlation ID that is included in the message is identical to a TEID of the L-GW  1   c - 40  to which the base station itself is connected. The base station  1   c - 20  notifies the L-GW  1   c - 40  that a path has been changed from the previous base station to the base station itself, and the L-GW  1   c - 40  establishes a tunneling connection from the corresponding previous base station to the current base station through the use of the same correlation ID, at  1   c - 71 . 
         [0105]    If the bearer information or the session information is changed after the connection to the L-GW  1   c - 40  is completed, the base station  1   c - 20  re-performs a DRB setup procedure, at  1   c - 73 . Further, the base station  1   c - 20  completes the handover procedure through transferring of information on the bearer through which the connection to the L-GW  1   c - 40  is completed to the terminal  1   c - 10 . Thereafter, the terminal may transmit the V2X message or the V2V message through the V2X local network. 
         [0106]    In the above-described method according to an embodiment of the present disclosure, if the terminal  1   c - 10  performs handover between base stations that are connected to the L-GW  1   c - 40 , the bearer or session of the L-GW  1   c - 40  that is configured with respect to the terminal  1   c - 10  is not released, but only the bearer or session between the base station  1   c - 20  and the terminal  1   c - 10  can be reconfigured to use the V2X service. 
         [0107]      FIG. 1D  is a diagram illustrating the structure of a terminal according to an embodiment of the present disclosure. 
         [0108]    Referring to  FIG. 1D , a terminal may include a transceiver unit  1   d - 10 , a controller  1   d - 20 , and a storage unit  1   d - 30 . The controller according to the present disclosure may be defined as a circuit, an application specific integrated circuit, or at least one processor. 
         [0109]    The transceiver unit  1   d - 10  may transmit and receive signals with another network entity. The transceiver unit  1   d - 10  may transmit and receive signals under the control of the controller  1   d - 20 . 
         [0110]    The controller  1   d - 20  may control the whole operation of the terminal according to an embodiment proposed in the present disclosure. The controller  1   d - 20  may control the operation of the terminal according to the first embodiment of the present disclosure. For example, the controller  1   d - 20  may control the operation of the terminal as described above with reference to  FIGS. 1A to 1C . 
         [0111]    The storage unit  1   d - 30  may store therein at least one of information that is transmitted and received through the transceiver unit  1   d - 10  and information that is generated through the controller  1   d - 20 . Further, the storage unit  1   d - 30  may store therein information and codes for operating the controller  1   d - 20 . 
         [0112]      FIG. 1E  is a diagram illustrating the structure of a base station according to an embodiment of the present disclosure. 
         [0113]    Referring to  FIG. 1E , a base station may include a transceiver unit  1   e - 10 , a controller  1   e - 20 , and a storage unit  1   e - 30 . The controller according to the present disclosure may be defined as a circuit, an application specific integrated circuit, or at least one processor. 
         [0114]    The transceiver unit  1   e - 10  may transmit and receive signals with another network entity. The transceiver unit  1   e - 10  may transmit and receive signals under the control of the controller  1   e - 20 . 
         [0115]    The controller  1   e - 20  may control the whole operation of the base station according to an embodiment proposed in the present disclosure. The controller  1   e - 20  may control the operation of the base station according to the first embodiment of the present disclosure. For example, the controller  1   e - 20  may control the operation of the base station as described above with reference to  FIGS. 1A to 1C . 
         [0116]    The storage unit  1   e - 30  may store therein at least one of information that is transmitted and received through the transceiver unit  1   e - 10  and information that is generated through the controller  1   e - 20 . Further, the storage unit  1   e - 30  may store therein information and codes for operating the controller  1   e - 20 . 
         [0117]      FIG. 1F  is a diagram illustrating the structure of an MME according to an embodiment of the present disclosure. The structure of an MME may be applied to the structure of a control function. The control function may include an SM function and an MM function, and each function may include a transceiver unit and a controller. 
         [0118]    Referring to  FIG. 1F , the MME may include a transceiver unit  1   f - 10 , a controller  1   f - 20 , and a storage unit  1   f - 30 . The controller according to the present disclosure may be defined as a circuit, an application specific integrated circuit, or at least one processor. 
         [0119]    The transceiver unit  1   f - 10  may transmit and receive signals with another network entity. The transceiver unit  1   f - 10  may transmit and receive signals under the control of the controller  1   f - 20 . 
         [0120]    The controller  1   f - 20  may control the whole operation of the MME according to an embodiment proposed in the present disclosure. The controller  1   f - 20  may control the operation of the MME or a control function according to the first embodiment of the present disclosure. For example, the controller  1   f - 20  may control the operation of the MME or the control function as described above with reference to  FIGS. 1A to 1C . 
         [0121]    The storage unit  1   f - 30  may store therein at least one of information that is transmitted and received through the transceiver unit  1   f - 10  and information that is generated through the controller  1   f - 20 . Further, the storage unit  1   f - 30  may store therein information and codes for operating the controller  1   f - 20 . 
         [0122]      FIG. 1G  is a diagram illustrating the structure of an L-GW according to an embodiment of the present disclosure. 
         [0123]    Referring to  FIG. 1G , the L-GW may include a transceiver unit  1   g - 10 , a controller  1   g - 20 , and a storage unit  1   g - 30 . The controller according to the present disclosure may be defined as a circuit, an application specific integrated circuit, or at least one processor. 
         [0124]    The transceiver unit  1   g - 10  may transmit and receive signals with another network entity. The transceiver unit  1   g - 10  may transmit and receive signals under the control of the controller  1   g - 20 . 
         [0125]    The controller  1   g - 20  may control the whole operation of the L-GW according to an embodiment proposed in the present disclosure. The controller  1   g - 20  may control the operation of the L-GW according to the first embodiment of the present disclosure. For example, the controller  1   g - 20  may control the operation of the L-GW as described above with reference to  FIGS. 1A to 1C . 
         [0126]    The storage unit  1   g - 30  may store therein at least one of information that is transmitted and received through the transceiver unit  1   g - 10  and information that is generated through the controller  1   g - 20 . Further, the storage unit  1   g - 30  may store therein information and codes for operating the controller  1   g - 20 . 
       Second Embodiment 
       [0127]      FIG. 2A  is a diagram illustrating the structure of a network in which a terminal that is mounted with an embedded subscriber identification module (eSIM) performs subscriber identification module (SIM) profile provisioning according to an embodiment of the present disclosure. 
         [0128]    Referring to  FIG. 2A , a terminal (or UE) is mounted with an embedded universal integrated circulated card (eUICC) in order to use an eSIM. After the terminal secures connectivity through connection to a packet CN, the eUICC receives provisioning of a SIM profile that corresponds to a mobile network operator (MNO) that will use a data service from an eSIM server (e.g., subscription manager data preparation plus (SM-DP+) server). If the terminal or the eUICC does not have an address of an SM-DP+ server, the terminal receives provisioning of the SIM profile through connection to the SM-DP+ server after acquiring the address of a suitable SM-DP+ server through connection to an SM-DS server that is one other eSIM server. 
         [0129]    The packet CN to which the terminal connects to secure the connectivity may be, for example, a cellular network that provides data communication, and may be, for example, an EPS that provides an LTE network service or a 5G network. There may be an MM functional entity that takes charge of MM of the terminal and an SM functional entity that takes charge of SM, and through the functional entities, signaling messages may be processed. In the case of an EPS, an MME serves as the MM functional entity and the SM functional entity. Further, an equipment identity register (EIR) is an entity that determines whether the terminal is a permitted terminal through an IMEI of the terminal in a network, and in the present disclosure, the EIR is defined as an entity that can determine whether the eUICC is a permitted eUICC with respect to an eUICC ID. As an authentication server for encrypted communication with the terminal or the eUICC, for example, there is an authentication, authorization, and access (AAA) server, and if encryption is not performed in the process of connecting to the packet CN, the AAA server is not used. Although not illustrated in  FIG. 1B , the system may include a base station, and through the base station, the terminal and the MM or the terminal and the MME may transmit and receive signals, information, data, and messages. 
         [0130]      FIGS. 2B-1 and 2B-2  are diagrams illustrating network connection schemes for a terminal that is mounted with an eSIM to perform initial provisioning according to various embodiments of the present disclosure. Hereinafter,  FIGS. 2B-1 and 2B-2  are commonly called  FIG. 2B . 
         [0131]    Referring to  FIGS. 2B-1 and 2B-2 , in an embodiment of the present disclosure, a process is illustrated, in which connectivity is acquired through connection to a cellular network, provisioning of a SIM profile is received through an eSIM server, and connection to the network is performed using the downloaded SIM profile. 
         [0132]    In a turn-on state, a terminal  2   b - 100  checks a SIM profile, and if there is not the SIM profile, the terminal recognizes the necessity of initial provisioning and transfers a list of available public land mobile networks (PLMNs) to an application of the terminal or an entity that takes charge of the initial provisioning on the basis of a list of PLMNs that are sensed through a cell search, at  2   b - 001 . 
         [0133]    The terminal  2   b - 100  may select a PLMN to be connected to for the initial provisioning on the basis of the transferred PLMN list, at  2   b - 002 . The selection of the PLMNs may be performed through a user&#39;s selection input or in accordance with the priority order according to a specific priority rule in the terminal. For example, in the case of a smart phone that facilitates the user&#39;s input, an initial provisioning app presents a list of PLMNs that can be selected through a UI, and a user may select a PLMN through which the user desires to receive the provisioning. As another method, if it is difficult to make the user&#39;s input, for example, if a communication network service provider to be used is determined later after an internet of things (IoT) service provider purchases an IoT-oriented terminal, and thus there is no information on the communication network service provider in the terminal, a PLMN that corresponds to the highest priority may be selected in accordance with the priority rule of the terminal itself, such as selection of a PLMN having the highest signal strength among available PLMNs. 
         [0134]    The terminal  2   b - 100  requests a network connection through the PLMN that is selected in the above-described process while transmitting an attach request to an MME  2   b - 200 . In this case, through an attach request message, it can be known that an attach type is for the initial provisioning, at  2   b - 003 . For example, “attach type=initial provisioning” may be used. In this case, the attach request message may include an identity of the terminal  2   b - 100 , for example, both or one of an international mobile equipment identity (IMEI) or an eUICC identity (e.g., eUICC ID or eID). Further, the attach request message may include both or one of an address of an SM-DS server and an address of an SM-DP+ server to be connected to the terminal. 
         [0135]    The MME  2   b - 200  transmits a request message to an EIR  2   b - 300  in order to determine whether the terminal that has sent the attach request is a terminal that is permitted in the corresponding PLMN, or whether the eUICC that is used by the terminal is a permitted eUICC. The request message may include at least one of an IMEI and an eUICC ID, and may request checking of whether the ID is permitted with respect to each identifier or both identifiers, at  2   b - 004 . 
         [0136]    The EIR  2   b - 300  checks whether the terminal or the eUICC is a connection-permitted terminal or a connection-permitted eUICC on the basis of information that is received from the MME  2   b - 200 , at  2   b - 005 . The EIR  2   b - 300  may determine whether to permit the IMEI or eUICC ID in a manner that network connection is rejected if a transmitted ID is in a blacklist of IMEIs or eUICC IDs that are managed to prevent inferiority or robbery that is managed in the corresponding service provider network or to prevent online opening. As another method, network connection is permitted only in the case where a transmitted ID is included in a white list of IMEIs or EUICC IDs of terminals, of which the online opening can be specially permitted by the corresponding service provider. In the case where a terminal manufacturer that has manufactured IoT terminals provides information on IMEI or eUICC ID to an IoT service provider without providing network opening to the IoT service provider, and IoT service providers make a contract to use a network of a communication network service provider later, information on the IMEI or eUICC ID that is received from the terminal manufacturer is transferred to the communication network service provider. The communication network service provider may store the white list in the EIR  2   b - 300  on the basis of the transferred information, and may permit an attach only with respect to the terminal of the IMEI or eUICC ID to be subscribed through checking whether the IMEI, eUICC ID, or both of them are permitted IDs through the EIR with respect to all the terminals that have sent an attach request for the initial provisioning. 
         [0137]    The EIR  2   b - 300  may transmit to the MME  2   b - 200  information that indicates whether connection of the terminal  2   b - 100  or eUICC is permitted, at  2   b - 006 . 
         [0138]    If the information that is received from the EIR  2   b - 300  indicates that the connection is not permitted, the MME  2   b - 200  may send an attach reject message to the terminal  2   b - 100  to reject the network connection, at  2   b - 007 . In this case, the rejection cause that is included in the reject message may include eUICC ID mismatch in the PLMN, IMEI mismatch in the PLMN, eUICC ID is not available in the PLMN, and IMEI is not available in the PLMN. 
         [0139]    In the case of receiving the attach reject message, the terminal  2   b - 100  may store the ID of the corresponding PLMN in a forbidden PLMN list for initial provisioning, and may re-select the PLMN among available PLMNs, at  2   b - 008 . In this case, the PLMN that is included in the forbidden PLMN list for initial provisioning is excluded from the available PLMN list. The selection of the PLMN is performed in the same manner as  2   b - 002 , and the terminal  2   b - 100  performs again an attach request process for the initial provisioning. 
         [0140]    On the other hand, if the EIR  2   b - 300  notifies the MME  2   b - 200  that the connection of the terminal  2   b - 100  has been permitted, the MME  2   b - 200  omits an authentication/authorization process for security, and selects a GW for the initial provisioning, at  2   b - 009 . That is, in an embodiment of the present disclosure, since the attach process is an attach process for provisioning, it is newly proposed for the MME  2   b - 200  to omit the authentication/authorization process. At  2   b - 003 , the terminal  2   b - 100  may piggyback a PDN connectivity request on an attach request message, and even if the PDN connectivity request is not transferred together in the case where the access type of the attach request message is for the initial provisioning, the MME  2   b - 200  selects a gateway (GW)  2   b - 400  for performing the initial provisioning, and transfers a create session request to the GW  2   b - 400  to request the GW to make the PDN connection, at  2   b - 010 . In this case, if the GW for the initial provisioning is not designated to be used as a separate entity in the network, the create session request includes an indication capable of notifying of the initial provisioning. Further, the create session request may include an address of an SM-DS server that is received from the terminal  2   b - 100  or an address of an SM-DP+ server. 
         [0141]    On the other hand, if it is recognized that the create session request is for the initial provisioning, the GW  2   b - 400  that has received the create session request may allocate an IP address, and may operate to generate a default EPS bearer context. In this case, the GW generates a traffic flow template (TFT) in the default EPS bearer so that the terminal  2   b - 100  can use the same only for the purpose of traffic for the initial provisioning, and it configures an uplink/downlink packet filter so that the communication becomes possible only in the case where the address of the eSIM server (e.g., SM-DP+ server or SM-DS server) is included as a destination/source IP address, at  2   b - 011 . In the process of configuring the uplink/downlink packet filter, an IP address to be used for specific filtering may be determined on the basis of the address of the SM-DS server or the address of the SM-DP+ server that is received from the terminal  2   b - 100 , or the address that is serviced by the terminal  2   b - 100  may be used for authorization. 
         [0142]    The GW  2   b - 400  may transmit a create session response message to the MME  2   b - 200 . The create session response message may include the TFT that includes the uplink/downlink packet filter for the default EPS bearer, at  2   b - 012 . 
         [0143]    The MME  2   b - 200  may include the received TFT in an activate default EPS bearer context request message, at  2   b - 013 . The MME  2   b - 200  may transfer the activate default EPS bearer context request message to the terminal  2   b - 100  together with an attach accept message, at  2   b - 014 . 
         [0144]    The terminal  2   b - 100  may transfer an attach complete message to the MME  2   b - 200 , and at this time, it may transfer an active default EPS bearer context accept message together, at  2   b - 015 . Thereafter, the terminal  2   b - 100  may establish a PDN connection to the GW  2   b - 400 , at  2   b - 016 . 
         [0145]    Thereafter, the terminal  2   b - 100  may attach to an eSIM server  2   b - 500  using the acquired connectivity to receive provisioning of a SIM profile, at  2   b - 017 . If an SM-DS address exists in a packet filter that is configured in the TFT, but an SM-DP+ address is omitted to cause the SIM profile provisioning to be unsuccessfully performed in the process of attaching to the eSIM server, the terminal adds an ID of the currently attached PLMN to a forbidden PLMN list for initial provisioning, and then performs detach and attach request processes in order, at  2   b - 018 . If the provisioning of the SIM profile is successfully performed, the terminal  2   b - 100  performs a normal attach process using the downloaded SIM profile to use a data service, at  2   b - 019 . 
         [0146]      FIGS. 2C-1 and 2C-2  are diagrams illustrating network connection schemes for a terminal that is mounted with an eSIM to perform initial provisioning according to various embodiments of the present disclosure. Hereinafter,  FIGS. 2C-1 and 2C-2  are commonly called  FIG. 2C . 
         [0147]    Referring to  FIGS. 2C-1 and 2C-2 , in an embodiment of the present disclosure, a process is illustrated, in which connectivity is acquired through connection to a cellular network, provisioning of a SIM profile is received through an eSIM server, and connection to the network is performed using the downloaded SIM profile. The technology illustrated in  FIGS. 2C-1 and 2C-2  is similar to the technology illustrated in  FIGS. 2B-1 and 2B-2  except for the procedure in which a GW installs a packet filter in a default EPS bearer. 
         [0148]    In a turn-on state, a terminal  2   c - 100  checks a SIM profile, and if there is not the SIM profile, the terminal recognizes the necessity of initial provisioning and transfers a list of available PLMNs to an application of the terminal or an entity that takes charge of the initial provisioning on the basis of a list of PLMNs that are sensed through a cell search, at  2   c - 001 . 
         [0149]    The terminal  2   c - 100  may select a PLMN to be connected to for the initial provisioning on the basis of the transferred PLMN list, at  2   c - 002 . The selection of the PLMNs may be performed through a user&#39;s selection input or in accordance with the priority order according to a specific priority rule in the terminal. For example, in the case of a smart phone that facilitates the user&#39;s input, an initial provisioning app presents a list of PLMNs that can be selected through a UI, and a user may select a PLMN through which the user desires to receive the provisioning. As another method, if it is difficult to make the user&#39;s input, for example, if a communication network service provider to be used is determined later after an IoT service provider purchases an IoT-oriented terminal, and thus there is no information on the communication network service provider in the terminal, a PLMN that corresponds to the highest priority may be selected in accordance with the priority rule of the terminal itself, such as selection of a PLMN having the highest signal strength among available PLMNs. 
         [0150]    The terminal  2   c - 100  requests a network connection through the PLMN that is selected in the above-described process while transmitting an attach request to an MME  2   c - 200 . In this case, through an attach request message, it can be known that an attach type is for the initial provisioning, at  2   c - 003 . For example, “attach type=initial provisioning” may be used. In this case, the attach request message may include an identity of the terminal, for example, both or one of an IMEI or an eUICC identity (e.g., eUICC IDs). Further, the attach request message may include both or one of an address of an SM-DS server and an address of an SM-DP+ server to be connected to the terminal. 
         [0151]    The MME  2   c - 200  transmits a request message to an EIR  2   c - 300  in order to determine whether the terminal  2   c - 100  that has sent the attach request is a terminal that is permitted in the corresponding PLMN, or whether the eUICC that is used by the terminal  2   c - 100  is a permitted eUICC. The request message may include at least one of an IMEI and an eUICC ID, and may request checking of whether the ID is permitted with respect to each identifier or both identifiers, at  2   c - 004 . 
         [0152]    The EIR  2   c - 300  checks whether the terminal or the eUICC is a connection-permitted terminal or a connection-permitted eUICC on the basis of information that is received from the MME  2   c - 200 , at  2   c - 005 . The EIR  2   c - 300  may determine whether to permit the IMEI or eUICC ID in a manner that network connection is rejected if a transmitted ID is in a blacklist of IMEIs or eUICC IDs that are managed to prevent inferiority or robbery that is managed in the corresponding service provider network or to prevent online opening. As another method, network connection is permitted only in the case where a transmitted ID is included in a white list of IMEIs or eUICC IDs of terminals, of which the online opening can be specially permitted by the corresponding service provider. In the case where a terminal manufacturer that has manufactured IoT terminals provides information on IMEI or eUICC ID to an IoT service provider without providing network opening to the IoT service provider, and IoT service providers make a contract to use a network of a communication network service provider later, information on the IMEI or eUICC ID that is received from the terminal manufacturer is transferred to the communication network service provider. The communication network service provider may store the white list in the EIR  2   c - 300  on the basis of the transferred information, and may permit an attach only with respect to the terminal of the IMEI or eUICC ID to be subscribed through checking whether the IMEI, eUICC ID, or both of them are permitted IDs through the EIR with respect to all the terminals that have sent an attach request for the initial provisioning. 
         [0153]    The EIR  2   c - 300  may transmit to the MME  2   c - 200  information that indicates whether connection of the terminal  2   c - 100  or eUICC is permitted, at  2   c - 006 . 
         [0154]    If the information that is received from the EIR  2   c - 300  indicates that the connection is not permitted, the MME  2   c - 200  may send an attach reject message to the terminal  2   c - 100  to reject the network connection, at  2   c - 007 . In this case, the rejection cause that is included in the reject message may include eUICC ID mismatch in the PLMN, IMEI mismatch in the PLMN, eUICC ID is not available in the PLMN, and IMEI is not available in the PLMN. 
         [0155]    In the case of receiving the attach reject message, the terminal  2   c - 100  may store the ID of the corresponding PLMN in a forbidden PLMN list for initial provisioning, and may re-select the PLMN among available PLMNs, at  2   c - 008 . In this case, the PLMN that is included in the forbidden PLMN list for initial provisioning is excluded from the available PLMN list. The selection of the PLMN is performed in the same manner as  2   c - 002 , and the terminal  2   c - 100  performs again an attach request process for the initial provisioning. 
         [0156]    On the other hand, if the EIR  2   c - 300  notifies the MME  2   c - 200  that the connection of the terminal  2   c - 100  has been permitted, the MME  2   c - 200  omits an authentication/authorization process for security, and selects a GW for the initial provisioning, at  2   c - 009 . That is, in an embodiment of the present disclosure, since the attach process is an attach process for provisioning, it is newly proposed for the MME  2   c - 200  to omit the authentication/authorization process. At  2   c - 003 , the terminal  2   c - 100  may piggyback a PDN connectivity request on an attach request message, and even if the PDN connectivity request is not transferred together in the case where the access type of the attach request message is for the initial provisioning, the MME  2   c - 200  selects a GW  2   c - 400  for performing the initial provisioning, and transfers a create session request to the GW  2   c - 400  to request the GW to make the PDN connection, at  2   c - 010 . In this case, if the GW for the initial provisioning is not designated to be used as a separate entity in the network, the create session request includes an indication capable of notifying of the initial provisioning. Further, the create session request may include an address of an SM-DS server that is received from the terminal  2   c - 100  or an address of an SM-DP+ server. 
         [0157]    On the other hand, if it is recognized that the create session request is for the initial provisioning, the GW  2   c - 400  that has received the create session request may allocate an IP address, operate to generate a default EPS bearer context, and send a create session response to the MME  2   c - 200 , at  2   c - 011 . If the create session response is received, the MME  2   c - 200  may send an attach accept message to the terminal  2   c - 100 , at  2   c - 012 , and at this time, the MME  2   c - 200  may also transmit an activate default EPS bearer context request together. Detailed contents thereof have been described with reference to  FIG. 2B . 
         [0158]    The GW  2   c - 400 , after or just after the create session response is transmitted, generates a TFT in the default EPS bearer so that the terminal  2   c - 100  can use the same only for the purpose of traffic for the initial provisioning, and it configures an uplink/downlink packet filter so that the communication becomes possible only in the case where the address of the eSIM server (e.g., SM-DP+ server or SM-DS server) is included as a destination/source IP address, at  2   c - 013 . 
         [0159]    In the process of configuring the uplink/downlink packet filter, an IP address to be used for specific filtering may be determined on the basis of the address of the SM-DS server or the address of the SM-DP+ server that is received from the terminal  2   c - 100 , or the address that is serviced by the terminal  2   c - 100  may be used for authorization. 
         [0160]    The GW  2   c - 400  may include the TFT in an update bearer request to be sent to the MME so as to apply the TFT that includes the uplink/downlink packet filter for the default EPS bearer as described above, at  2   c - 014 . 
         [0161]    On the other hand, the MME  2   c - 200  that has received the create session response message may transmit an activate default EPS bearer context request to the terminal  2   c - 100  together with the attach accept message. The terminal  2   c - 100  may transfer an attach complete message to the MME  2   c - 200 , and at this time, it may transfer an active default EPS bearer context accept message together, at  2   c - 015 . Thereafter, the terminal  2   c - 100  may establish a PDN connection to the GW  2   c - 400 , at  2   c - 016 . 
         [0162]    Further, at  2   c - 014 , the MME  2   c - 200  that has received the update bearer request applies to the default EPS bearer the TFT that includes the packet filter that limits the use of traffic only for the initial provisioning through EPS bearer modification, and notifies the GW  2   c - 400  of the result through the update bearer response message. That is, the MME  2   c - 200  transmits a modify EPS bearer context request message to the terminal  2   c - 100 , at  2   c - 017 . The terminal  2   c - 100  transmits a modify EPS bearer context accept message to the MME  2   c - 200 , at  2   c - 018 . Thereafter, the MME  2   c - 200  transmits an update bearer response message to the GW  2   c - 400 , at  2   c - 019 . 
         [0163]    Thereafter, the terminal may attach to an eSIM server  2   c - 500  using the acquired connectivity to receive provisioning of a SIM profile, at  2   c - 020 . If an SM-DS address exists in a packet filter that is configured in the TFT, but an SM-DP+ address is omitted to cause the SIM profile provisioning to be unsuccessfully performed in the process of attaching to the eSIM server  2   c - 500 , the terminal  2   c - 100  adds an ID of the currently attached PLMN to a forbidden PLMN list for initial provisioning, and then performs detach and attach request processes in order, at  2   c - 021 . If the provisioning of the SIM profile is successfully performed, the terminal  2   c - 100  may perform a normal attach process using the downloaded SIM profile to use a data service, at  2   c - 022 . 
         [0164]      FIGS. 2D-1 and 2D-2  are diagrams illustrating network connection schemes for a terminal that is mounted with an eSIM to perform initial provisioning in consideration of an ID security according to various embodiments of the present disclosure. Hereinafter,  FIGS. 2D-1 and 2D-2  are commonly called  FIG. 2D . 
         [0165]    Referring to  FIGS. 2D-1 and 2D-2 , in an embodiment of the present disclosure, a process is illustrated, in which connectivity is acquired through connection to a cellular network, provisioning of a SIM profile is received through an eSIM server, and connection to the network is performed using the downloaded SIM profile. In particular, this embodiment includes a method for encrypting information, such as IMEI or eUICC ID. 
         [0166]    In a turn-on state, a terminal  2   d - 100  checks a SIM profile, and if there is not the SIM profile, the terminal recognizes the necessity of initial provisioning and transfers a list of available PLMNs to an application of the terminal or an entity that takes charge of the initial provisioning on the basis of a list of PLMNs that are sensed through a cell search, at  2   d - 001 . 
         [0167]    The terminal  2   d - 100  may select a PLMN to be connected to for the initial provisioning on the basis of the transferred PLMN list, at  2   d - 002 . The selection of the PLMNs may be performed through a user&#39;s selection input or in accordance with the priority order according to a specific priority rule in the terminal. For example, in the case of a smart phone that facilitates the user&#39;s input, an initial provisioning app presents a list of PLMNs that can be selected through a UI, and a user may select a PLMN through which the user desires to receive the provisioning. As another method, if it is difficult to make the user&#39;s input, for example, if a communication network service provider to be used is determined later after an IoT service provider purchases an IoT-oriented terminal, and thus there is no information on the communication network service provider in the terminal, a PLMN that corresponds to the highest priority may be selected in accordance with the priority rule of the terminal itself, such as selection of a PLMN having the highest signal strength among available PLMNs. 
         [0168]    The terminal  2   d - 100  requests a network connection through the PLMN that is selected in the above-described process while transmitting an attach request to an MM functional entity  2   d - 200 . In this case, through an attach request message, it can be known that an attach type is for the initial provisioning, at  2   d - 003 . For example, “attach type =initial provisioning” may be used. 
         [0169]    The MM functional entity  2   d - 200  that has received the attach request triggers an extensible authentication protocol (EAP) process, and the terminal  2   d - 100  authenticates an AAA server  2   d - 600  on the basis of an AAA server certificate through EAP-TLS or EAP-TTLS between the terminal  2   d - 100  and the AAA server  2   d - 600  of a network, and generates a secure tunnel on the basis of an encryption key that is created in the authentication process, at  2   d - 004 . 
         [0170]    If the secure tunnel is generated, the terminal  2   d - 100  transmits an IMEI, an eUICC ID, or both of them to the MM functional entity  2   d - 200 , at  2   d - 005 . Again, the MM functional entity  2   d - 200  determines whether the transmitted ID is a permitted ID through sending the IMEI, eUICC ID, or both of them to an EIR  2   d - 300 , at  2   d - 006 . 
         [0171]    Further, the terminal  2   d - 100  may send to the MM functional entity  2   d - 200  including both or one of an address of an SM-DS server and an address of an SM-DP+ server to be connected to the terminal  2   d - 100 . 
         [0172]    As another embodiment, processes of  2   d - 005 ,  2   d - 006 ,  2   d - 007 , and  2   d - 008  may be replaced by a method in which the terminal transfers the IMEI, eUICC ID, or both IDs to the AAA server through an EAP message at  2   d - 004 , and the AAA server determines whether the transferred ID is a permitted ID through sending of the IMEI, eUICC ID, or both IDs to the EIR. 
         [0173]    The EIR  2   d - 300  checks whether the terminal or the eUICC is a connection-permitted terminal or a connection-permitted eUICC on the basis of information that is received from the MM functional entity  2   d - 200 , at  2   d - 007 . 
         [0174]    The EIR may determine whether to permit the IMEI or eUICC ID in a manner that network connection is rejected if the transmitted ID is in a blacklist of IMEIs or eUICC IDs that are managed to prevent inferiority or robbery that is managed in the corresponding service provider network or to prevent online opening. As another method, network connection is permitted only in the case where a transmitted ID is included in a white list of IMEIs or eUICC IDs of terminals, of which the online opening can be specially permitted by the corresponding service provider. In the case where a terminal manufacturer that has manufactured IoT terminals provides information on IMEI or eUICC ID to an IoT service provider without providing network opening to the IoT service provider, and IoT service providers make a contract to use a network of a communication network service provider later, information on the IMEI or eUICC ID that is received from the terminal manufacturer is transferred to the communication network service provider. The communication network service provider may store the white list in the EIR  2   d - 300  on the basis of the transferred information, and may permit an attach only with respect to the terminal of the IMEI or eUICC ID to be subscribed through checking whether the IMEI, eUICC ID, or both of them are permitted IDs through the EIR with respect to all the terminals that have sent an attach request for the initial provisioning. 
         [0175]    The EIR  2   d - 300  may transmit to the MM functional entity  2   d - 200  information that indicates whether connection of the terminal  2   d - 100  or eUICC is permitted, at  2   d - 008 . 
         [0176]    If the information that is received from the EIR  2   d - 300  indicates that the connection is not permitted, the MM functional entity  2   d - 200  may send an attach reject message to the terminal  2   d - 100  to reject the network connection, at  2   d - 009 . In this case, the rejection cause that is included in the reject message may include eUICC ID mismatch in the PLMN, IMEI mismatch in the PLMN, eUICC ID is not available in the PLMN, and IMEI is not available in the PLMN. 
         [0177]    In the case of receiving the attach reject message, the terminal  2   d - 100  may store the ID of the corresponding PLMN in a forbidden PLMN list for initial provisioning, and may select the PLMN among available PLMNs, at  2   d - 010 . In this case, the PLMN that is included in the forbidden PLMN list for initial provisioning is excluded from the available PLMN list. The selection of the PLMN is performed in the same method as  2   d - 002 , and the terminal  2   d - 100  performs again an attach request process for the initial provisioning. 
         [0178]    On the other hand, if the EIR  2   d - 300  notifies the MM functional entity  2   d - 200  of the connection permission, the MM functional entity  2   d - 200  omits an authentication/authorization process for security, at  2   d - 011 , and requests an SM functional entity  2   d - 201  to generate a PDU session for initial provisioning, at  2   d - 012 . That is, in an embodiment of the present disclosure, since the attach process is an attach process for provisioning, it is newly proposed for the MM functional entity  2   d - 200  to omit the authentication/authorization process. At  2   d - 003 , the terminal  2   d - 100  may piggyback a PDN connectivity request on an attach request message, and even if the PDN connectivity request is not transferred together in the case where the access type of the attach request message is for the initial provisioning, the MM functional entity  2   d - 200  may request the SM functional entity  2   d - 201  to generate the PDU session for performing the initial provisioning. In this case, a PDU generation request message may include an address of an SM-DS server that is received from the terminal  2   d - 100  or an address of an SM-DP+ server. 
         [0179]    The SM functional entity  2   d - 201  that has received the PDU generation request selects a GW  2   d - 400  for the initial provisioning, at  2   d - 013 , and transfers a create session request to the GW  2   d - 400  to request the GW to make the PDU connection, at  2   d - 014 . In this case, if the GW for the initial provisioning is not designated to be used as a separate entity in the network, the create session request includes an indication capable of notifying of the initial provisioning. 
         [0180]    Further, the create session request may include an address of an SM-DS server that is received from the terminal  2   d - 100  or an address of an SM-DP+ server. 
         [0181]    On the other hand, if it is recognized that the create session request is for the initial provisioning, the GW  2   d - 400  that has received the create session request may allocate an IP address, and may operate to generate a default bearer context. In this case, the GW generates a TFT in the default bearer so that the terminal  2   d - 100  can use the same only for the purpose of traffic for the initial provisioning, and it configures an uplink/downlink packet filter so that the communication becomes possible only in the case where the address of the eSIM server (e.g., SM-DP+ server or SM-DS server) is included as a destination/source IP address, at  2   d - 015 . 
         [0182]    In the process of configuring the uplink/downlink packet filter, an IP address to be used for specific filtering may be determined on the basis of the address of the SM-DS server or the address of the SM-DP+ server that is received from the terminal  2   d - 100 , or the address that is serviced by the terminal  2   d - 100  may be used for authorization. 
         [0183]    If the GW  2   d - 400  has sent the TFT that includes the uplink/downlink packet filter for the default bearer to the SM functional entity  2   d - 201  as described above, at  2   d - 016 , the SM functional entity  2   d - 201  may configure the PDU connection through messaging for bearer setup between the MM functional entity  2   d - 200  and the terminal  2   d - 100 , and in the process, the TFT information is transferred to the terminal, at  2   d - 017 . 
         [0184]    Further, as another embodiment, the GW  2   d - 400  does not transfer the TFT that is generated at  2   d - 015  to the terminal  2   d - 100  through  2   d - 016  and  2   d - 017 , but may transfer to the terminal  2   d - 100  the TFT that limits the use of traffic only for the initial provisioning through a process of updating the default bearer through the bearer update request, at  2   d - 018 ,  2   d - 019 , and  2   d - 020 . 
         [0185]    Thereafter, the terminal may attach to an eSIM server  2   d - 500  using the acquired connectivity to receive provisioning of a SIM profile, at  2   d - 021 . If an SM-DS address exists in a packet filter that is configured in the TFT, but an SM-DP+ address is omitted to cause the SIM profile provisioning to be unsuccessfully performed in the process of attaching to the eSIM server  2   d - 500 , the terminal  2   d - 100  adds an ID of the currently attached PLMN to a forbidden PLMN list for initial provisioning, and then performs detach and attach request processes in order, at  2   d - 022 . If the provisioning of the SIM profile is successfully performed, the terminal  2   d - 100  may perform a normal attach process using the downloaded SIM profile to use a data service, at  2   d - 023 . 
         [0186]      FIG. 2E  is a diagram illustrating the structure of a terminal according to an embodiment of the present disclosure. 
         [0187]    Referring to  FIG. 2E , a terminal may include a transceiver unit  2   e - 10 , a controller  2   e - 20 , and a storage unit  2   e - 30 . The controller according to the present disclosure may be defined as a circuit, an application specific integrated circuit, or at least one processor. 
         [0188]    The transceiver unit  2   e - 10  may transmit and receive signals with another network entity. The transceiver unit  2   e - 10  may transmit and receive signals under the control of the controller  2   e - 20 . 
         [0189]    The controller  2   e - 20  may control the whole operation of the terminal according to an embodiment proposed in the present disclosure. The controller  2   e - 20  may control the operation of the terminal according to the second embodiment of the present disclosure. For example, the controller  2   e - 20  may control the operation of the terminal as described above with reference to  FIGS. 2A to 2D . 
         [0190]    The storage unit  2   e - 30  may store therein at least one of information that is transmitted and received through the transceiver unit  2   e - 10  and information that is generated through the controller  2   e - 20 . Further, the storage unit  2   e - 30  may store therein information and codes for operating the controller  2   e - 20 . 
         [0191]      FIG. 2F  is a diagram illustrating the structure of an MME according to an embodiment of the present disclosure. The structure of an MME may be applied to the structure of a control function if it is applied to a NR system. The control function may include an SM function entity and an MM function entity, and each function may include a transceiver unit and a controller. 
         [0192]    Referring to  FIG. 2F , the MME may include a transceiver unit  2   f - 10 , a controller  2   f - 20 , and a storage unit  2   f - 30 . The controller according to the present disclosure may be defined as a circuit, an application specific integrated circuit, or at least one processor. 
         [0193]    The transceiver unit  2   f - 10  may transmit and receive signals with another network entity. The transceiver unit  2   f - 10  may transmit and receive signals under the control of the controller  2   f - 20 . 
         [0194]    The controller  2   f - 20  may control the whole operation of the MME according to an embodiment proposed in the present disclosure. The controller  2   f - 20  may control the operation of the MME or a control function according to the second embodiment of the present disclosure. For example, the controller  2   f - 20  may control the operation of the MME or the control function as described above with reference to  FIGS. 2A to 2D . 
         [0195]    The storage unit  2   f - 30  may store therein at least one of information that is transmitted and received through the transceiver unit  2   f - 10  and information that is generated through the controller  2   f - 20 . Further, the storage unit  2   f - 30  may store therein information and codes for operating the controller  2   f - 20 . 
         [0196]      FIG. 2G  is a diagram illustrating the structure of a GW according to an embodiment of the present disclosure. 
         [0197]    Referring to  FIG. 2G , the GW may include a transceiver unit  2   g - 10 , a controller  2   g - 20 , and a storage unit  2   g - 30 . The controller according to the present disclosure may be defined as a circuit, an application specific integrated circuit, or at least one processor. 
         [0198]    The transceiver unit  2   g - 10  may transmit and receive signals with another network entity. The transceiver unit  2   g - 10  may transmit and receive signals under the control of the controller  2   g - 20 . 
         [0199]    The controller  2   g - 20  may control the whole operation of the GW according to an embodiment proposed in the present disclosure. The controller  2   g - 20  may control the operation of the GW according to the second embodiment of the present disclosure. For example, the controller  2   g - 20  may control the operation of the GW as described above with reference to  FIGS. 2A to 2D . 
         [0200]    The storage unit  2   g - 30  may store therein at least one of information that is transmitted and received through the transceiver unit  2   g - 10  and information that is generated through the controller  2   g - 20 . Further, the storage unit  2   g - 30  may store therein information and codes for operating the controller  2   g - 20 . 
       Third Embodiment 
       [0201]    Hereinafter, the operation principle according to a third embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. In describing the present disclosure below, related well-known functions or configurations incorporated herein are not described in detail in the case where it is determined that they obscure the subject matter of the present disclosure in unnecessary detail. Further, terms to be described later are terms defined in consideration of their functions in the present disclosure, but may differ depending on intentions of a user and an operator or customs. Accordingly, they should be defined on the basis of the contents of the whole description of the present disclosure. 
         [0202]    Hereinafter, terms for identifying connection nodes used in the description, terms calling network entities, terms calling messages, terms calling interfaces between network entities, and terms calling various kinds of identification information are exemplified for convenience in explanation. Accordingly, the present disclosure is not limited by the terms to be described later, and other terms that call objects having the equivalent technical meanings may be used. 
         [0203]    Hereinafter, for convenience in explanation, terms and titles that are defined in the 3GPP LTE standards are used in the present disclosure. However, the present disclosure is not limited by such terms and titles, and they may be equally applied to systems that follow different standards. 
         [0204]      FIG. 3A  is a diagram illustrating an example of a network structure of a wireless communication system according to an embodiment of the present disclosure. 
         [0205]    Referring to  FIG. 3A , a wireless communication system includes a terminal  3   a - 01 , a base station  3   a - 02 , control functions  3   a - 03  including an MM  3   a - 04  and an SM  3   a - 05 , and a UP GW  3   a - 06 . In the wireless communication system, a set of devices which includes the control functions and the UP GW, but excludes the terminal and the base station is called a core network (CN). 
         [0206]    For interworking with external applications, the wireless communication system proceeds with communication with an Application Function (AF)  3   a - 07 , and receives service data associated with services from an outside through a data NW  3   a - 08 . 
         [0207]    The base station  3   a - 02  provides wireless connection to terminals. That is, the base station  3   a - 02  schedules and allocates wireless resources to serve users&#39; traffic and supports connections between the terminals and the CN. 
         [0208]    The MM  3   a - 04  performs MM function of the terminal, and is connected to the base station to transfer a control signal that is related to the MM to the terminal. 
         [0209]    The SM  3   a - 05  manages session in which the terminal can perform services through the data NW, and manages transmission of service data for the terminal through a connection to the UP GW  3   a - 06 . 
         [0210]    The UP GW  3   a - 06  processes packets that have come from the base station  3   a - 02  or packets to be transferred to the base station  3   a - 02 . 
         [0211]    A connection that is configured by the control functions  3   a - 03  to send and receive a control signal with the terminal  3   a - 01  is called a connection to an NG 1   3   a - 09 . 
         [0212]    A connection that is configured by the control functions  3   a - 03  to send and receive a control signal with the base station  3   a - 02  is called a connection to an NG 2   3   a - 10 . Packets that the terminal  3   a - 01  sends and receives with the control functions  3   a - 03  through the connection to the NG 1   3   a - 09  are transferred between the terminal  3   a - 01  and the base station  3   a - 02  through the wireless connection, and are also transferred between the base station and the control functions through the connection to the NG 2   3   a - 10 . 
         [0213]    A connection through which the UP GW  3   a - 06  sends and receives packets with the base station  3   a - 02  in order to send and receive the packets with the terminal is called a connection to an NG 3   3   a - 11 . 
         [0214]      FIG. 3B  is a diagram illustrating an example of a network structure of a wireless communication system to which network slices are applied according to an embodiment of the present disclosure. Functions of respective entities that correspond to  FIG. 3A  have been described with reference to  FIG. 3A . 
         [0215]    Referring to  FIG. 3B , the wireless communication system may have a separate SM  3   b - 06  and a separate UP GW  3   b - 07  for each slice. Even in the case where a terminal  3   b - 01  transmits and receives service data through several slices  3   b - 05 ,  3   b - 10 , and  3   b - 09  mobility related management can be received through a common MM  3   b - 04  that belongs to common CP functions  3   b - 03 . That is, the MM  3   b - 04  may control a plurality of SMs and a plurality of UP GWs. 
         [0216]    The slices as illustrated in  FIG. 3B  may be differently allocated by services that the terminal can receive through the wireless communication system. For example, slice  1   3   b - 09  of  FIG. 3B  may be allocated for Internet service, slice  2   3   b - 10  may be allocated for an emergency network service, and slice  3   3   b - 05  may be allocated for a communication service for a vehicle. Each slice is serviced through the SM and the UP GW that are allocated for each slice. For example, slice  3   3   b - 05  may provide a communication service to the terminal  3   b - 01  through the SM  3   b - 06  and the UP GW  3   b - 07 . 
         [0217]    In an embodiment of the present disclosure, the slice may correspond to a PDU session. The PDU session may correspond to the relationship between the terminal and a data network. Different data according to different services may be transmitted from different PDU sessions. Accordingly, each slice may correspond to each PDU session, and a different PDU session may correspond to a different slice. 
         [0218]    Hereinafter, in an embodiment of the present disclosure, for convenience in explanation, slices are divided. However, the concept of dividing slices may be applied as the concept of dividing PDU sessions, and the concept of providing or using identification information of slices may be applied as the concept of providing or using identification information of PDU sessions. In an embodiment of the present disclosure, a session may mean a PDU session. 
         [0219]      FIG. 3C  exemplifies a procedure in which if a terminal  3   c - 01  does not send and receive packets with a base station  3   c - 02  for a predetermined time in a wireless communication system, connections related to the terminal  3   c - 01  are released, and a mobility state of the terminal  3   c - 01  is changed to an idle state according to an embodiment of the present disclosure. 
         [0220]    Referring to  FIG. 3C , the base station  3   c - 02  may sense that there is no packet communication through the terminal  3   c - 01  for a predetermined time, at  3   c - 06 . The base station  3   c - 02  may transmit an RRC release for releasing wireless resources to the terminal  3   c - 01 , at  3   c - 07 . 
         [0221]    In another embodiment of the present disclosure, at  3   c - 07 , an RRC release message is not transmitted. Thereafter, the base station  3   c - 02  may transmit the RRC release  3   c - 14  to the terminal  3   c - 01  after receiving an NG 2 _Conn_Release Response  3   c - 131  or an NG 3 _Conn_Release Response  3   c - 13  from an MM function  3   c - 03  and an SM function  3   c - 04 . 
         [0222]    The terminal  3   c - 01  that has received the RRC release (i.e., at  3   c - 07  or  3   c - 14 ) checks that wireless resources with the base station  3   c - 02  are released, and performs idle state transition, at  3   c - 15 . 
         [0223]    The base station  3   c - 02  transmits to the MM function  3   c - 03  an NG 2 _Connection_Release_Request  3   c - 08  for releasing NG 2  connection between the base station and the MM function through an inactivity (i.e., at  3   c - 06 ) of the terminal. 
         [0224]    The MM function  3   c - 03  receives the NG 2 _Connection_Release_Request  3   c - 08  from the base station  3   c - 02 , and then transmits an NG 3 _Conn_Release Request  3   c - 09  to the SM function  3   c - 04  that manages the session for the terminal  3   c - 01  so as to release the NG 3  connection between the base station  3   c - 02  and the UP GW  3   c - 05 . 
         [0225]    As another embodiment of the present disclosure, the base station  3   c - 02  may transmit an NG 3 _Conn_Release Request  3   c - 17 . The base station  3   c - 02  may transmit the NG 3 _Conn_Release Request  3   c - 17  in a state where the NG 3 _Conn_Release Request  3   c - 17  is included in the NG 2 _Conn_Release Request  3   c - 08  message, or may transmit the same as a separate message. Further, the base station  3   c - 02  may transmit the NG 3 _Conn_Release Request  3   c - 17  so as to transfer the same to the SM function  3   c - 04  through the MM function  3   c - 03 , or may transmit the same so as to directly transfer the same to the SM function  3   c - 04  without passing through the MM function  3   c - 03 . The MM function  3   c - 03  may not transmit the NG 3 _Conn_Release Request  3   c - 09 , or the NG 3 _Conn_Release Request  3   c - 17  may be directly transmitted to the SM function  3   c - 04  without passing through the MM function  3   c - 03 . In this case, if the MM function  3   c - 03  receives the NG 2 _Conn_Release Request  3   c - 17  from the base station  3   c - 02 , it may transmit the NG 2 _Conn_Release Response  3   c - 131  to the base station  3   c - 02 , and may release the NG 2  connection. 
         [0226]    If the SM function  3   c - 04  receives the NG 3  Conn Release Request  3   c - 09  or the NG 3 _Conn_Release Request  3   c - 17  from the base station  3   c - 02  or the MM function  3   c - 03 , it transmits the NG 3 _Conn_Release Request  3   c - 10  to the UP GW  3   c - 05  to request the release of the NG 3  connection to the base station  3   c - 02  for the terminal  3   c - 01 . 
         [0227]    After receiving the NG 3 _Conn_Release Request  3   c - 10 , the UP GW  3   c - 05  releases the NG 3  connection to the base station  3   c - 02 , and transmits to the SM function  3   c - 04  an NG 3 _Conn_Release Response  3   c - 11  that notifies the SM function that the NG 3  connection has been released. 
         [0228]    Thereafter, the UP GW  3   c - 05  does not transmit packets to be transmitted to the terminal  3   c - 01  to the base station  3   c - 02 . 
         [0229]    If the SM function  3   c - 04  receives the NG 3 _Conn_Release Response  3   c - 11  from the UP GW  3   c - 05 , it transmits the NG 3 _Conn_Release Response  3   c - 12  or ec- 13  to the base station  3   c - 02  or the MM function  3   c - 03  that has transmitted the NG 3 _Conn_Release Request  3   c - 09  or  3   c - 17  to notify of the release of the NG 3  connection. 
         [0230]    The SM function  3   c - 04  may include an address of the UP GW  3   c - 05 , session information connected between the base station  3   c - 02  and the UP GW  3   c - 05 , and related QoS information in the NG 3 _Conn_Release Response  3   c - 12  or  3   c - 13  to be transmitted as information for reconfiguring the session during paging hereafter. Further, the SM function  3   c - 04  stored information of the MM function  3   c - 03  in order to use the information for transmission of paging for reconnection to the terminal  3   c - 01  hereafter. 
         [0231]    If the MM function  3   c - 03  receives the NG 3 _Conn_Release Response  3   c - 12  from the SM function  3   c - 04 , it may include information for notifying of the release of the NG 3  connection between the base station  3   c - 02  and the UP GW  3   c - 05  in the NG 2 _Conn_Release Response  3   c - 131  to be transmitted to the base station  3   c - 02 , and may release the NG 2  connection to the base station  3   c - 02 . 
         [0232]    After the MM function  3   c - 03  transmits the NG 2 _Conn_Release Response  3   c - 131  to the base station  3   c - 02  and releases the NG 2  connection, it considers that the terminal  3   c - 01  has entered into an idle mode, at  3   c - 16 . 
         [0233]    If the base station  3   c - 02  receives the NG 2 _Conn_Release Response  3   c - 131  and the NG 3 _Conn_Release response  3   c - 13  from the MM function  3   c - 03  and the SM function  3   c - 04 , it releases the NG 2  connection and the NG 3  connection. 
         [0234]    As another embodiment of the present disclosure, in the wireless communication system to which network slices are applied, an NG 3  connection release procedure through transmission of the NG 3 _Conn_Release Request between the base station  3   c - 02  and the MM function  3   c - 03  may be individually transmitted to each SM function that is included in each slice through which the terminal  3   c - 01  has been serviced, and may be individually performed through the SM function and the UP GW included in each slice. 
         [0235]      FIG. 3D  exemplifies a procedure in which paging is performed with respect to a terminal  3   d - 01  that is in an idle state, and thereafter, the terminal  3   d - 01  performs network reconnection in a wireless communication system according to an embodiment of the present disclosure. 
         [0236]    Referring to  FIG. 3D , if an UP GW  3   d - 05  receives data to be transmitted to the terminal  3   d - 01 , at  3   d - 06 , it checks session information that can transmit the data to the terminal  3   d - 01 . 
         [0237]    If the UP GW  3   d - 05  is unable to check the session information of the terminal  3   d - 01  or checks that the session with the terminal  3   d - 01  has been released, it notifies an SM function  3   d - 04  that is connected to the UP GW itself that the data has come to the terminal  3   d - 01 , at  3   d - 07 . In this case, information on data sessions may be included therein. The information on the data sessions may be PDU session information and may be a PDU session identifier. 
         [0238]    After receiving a notification of incoming data, at  3   d - 07 , that notifies of reception of data to be transmitted to the terminal  3   d - 01  from the UP GW  3   d - 05 , the SM function  3   d - 04  transmits an NG 3  setup request  3   d - 08  to an MM function  3   d - 03 . In this case, the NG 3  setup request  3   d - 08  may include at least one of an address of the UP GW  3   d - 05 , data session that is configured between the terminal  3   d - 01  and the UP GW  3   d - 05  and QoS information, and an IP address of the terminal  3   d - 01  to be used for the data session with the UP GW  3   d - 05 . In this case, the MM function  3   d - 03  to which the NG 3  setup request  3   d - 08  is to be transmitted may be selected using MM function information stored in the SM function  3   d - 04  during the NG 3  release procedure if the terminal  3   d - 01  enters into an idle mode or by other methods. 
         [0239]    After receiving the NG 3  setup request  3   d - 08  from the SM function  3   d - 04 , the MM function  3   d - 03  transmits paging  3   d - 09  to the terminal  3   d - 01  through base stations including a base station  3   d - 02 . 
         [0240]    The terminal  3   d - 01  configures a connection for wireless resource allocation to the base station  3   d - 02  after checking the existence of data to be received by the terminal itself through reception of the paging  3   d - 09 . Thereafter, the terminal  3   d - 01  transmits to the base station  3   d - 02  a service request  3   d - 11  to be transferred to the MM function  3   d - 03 , at  3   d - 12 . 
         [0241]    The MM function  3   d - 03  performs authentication and security setup procedure with the terminal  3   d - 01  after receiving the service request  3   d - 11  from the terminal  3   d - 01  through the base station  3   d - 02 , at  3   d - 13 . 
         [0242]    Through the authentication and security procedure, i.e., at  3   d - 13 , the MM function  3   d - 03  checks whether the terminal  3   d - 01  is a permitted straight terminal. Thereafter, the MM function  3   d - 03  transmits to the base station  3   d - 02  an NG 2 /NG 3  setup request  3   d - 14  for requesting setup of an NG 2 /NG 3  connection. In this case, the NG 2 /NG 3  setup request may include at least one of an address of the SM function  3   d - 04  and an address of the UP GW  3   d - 05  for the NG 3  connection, flow information related to data that is received at  3   d - 06  and QoS information, PDU session information to which a flow belongs, and an IP address of the terminal  3   d - 01  to be used for the data session with the UP GW  3   d - 05 . The PDU session information may be a PDU session identifier. 
         [0243]    After receiving the NG 2 /NG 3  setup request from the MM function  3   d - 03 , the base station  3   d - 02  performs radio bearer establishment  3   d - 15  that is a wireless resource allocation procedure for data transmission/reception in the session related to the data with the terminal  3   d - 01 . In this case, during the radio bearer establishment  3   d - 15 , the base station  3   d - 02  may notify the terminal  3   d - 01  of at least one of an address of the SM function  3   d - 04  and an address of the UP GW  3   d - 05 , flow information related to data that is received at  3   d - 06  and QoS information, PDU session information to which a flow belongs, and an IP address of the terminal  3   d - 01  to be used for the data session with the UP GW  3   d - 05 . 
         [0244]    After completing the radio bearer establishment  3   d - 15  with the terminal  3   d - 01 , the base station  3   d - 02  transmits an NG 2 /NG 3  setup response  3   d - 16  to the MM function  3   d - 03 . 
         [0245]    The base station  3   d - 02  may transmit a separate NG 3  setup response  3   d - 20  to the SM function  3   d - 04  for NG 3  connection setup with the UP GW  3   d - 05 . In this case, the NG 3  setup response  3   d - 17  may include information related to the corresponding session, such as an address of the base station that is necessary for the NG 3  connection setup and QoS information of wireless resources that is configured through the radio bearer establishment, to be transmitted. 
         [0246]    As another embodiment of the present disclosure, the base station  3   d - 02  does not transmit the NG 3  setup response, but the MM function  3   d - 03  may transmit the NG 3  setup response  3   d - 17  to the SM function  3   d - 04  after receiving the NG 2 /NG 3  setup response  3   d - 16  from the base station  3   d - 02 . 
         [0247]    The SM function  3   d - 04  transmits to the UP GW  3   d - 05  an NG 3  setup response  3   d - 18  for notifying that the NG 3  connection has been configured after receiving the NG 3  setup response  3   d - 17  or  3   d - 20  from the base station  3   d - 02  or the MM function  3   d - 03 . In this case, the NG 3  setup response  3   d - 18  may include information that is necessary for the NG 3  connection, such as an address of the base station  3   d - 02 , QoS information of a flow to transmit the data, and related session information. 
         [0248]    After receiving the NG 3  setup response  3   d - 18 , the UP GW  3   d - 05  configures the NG 3  connection to the base station  3   d - 02  using information that is included in the NG 3  setup response, and transmits data  3   d - 19  to the base station  3   d - 02  through the corresponding NG 3  connection. 
         [0249]    The data  3   d - 19  that is transmitted to the base station  3   d - 02  is transmitted to the terminal  3   d - 01  using wireless resources that are configured at  3   d - 15 . 
         [0250]      FIG. 3E  exemplifies a procedure in which paging is performed with respect to a terminal  3   e - 01  that is in an idle state, and thereafter, the terminal  3   e - 01  performs reconnection with network functions of network slices through which the terminal previously performed data communication in a wireless communication system that supports the network slices according to an embodiment of the present disclosure. 
         [0251]    Referring to  FIG. 3E , if an UP GW  3   e - 06  that belongs to NW slice  1   3   e - 04  receives data to be transmitted to the terminal  3   e - 01 , at  3   e - 10 , it checks session information that can transmit the data to the terminal  3   e - 01 . If the UP GW  3   e - 06  is unable to check the session information of the terminal  3   e - 01  or checks that the session with the terminal  3   e - 01  has been released, it notifies an SM function  3   e - 05  that is connected to the terminal itself that the data has come to the terminal  3   e - 01 , at  3   e - 11 . In this case, information on data sessions may be included therein. The information on the data sessions may be PDU session information and may be a PDU session identifier. 
         [0252]    After receiving a notification of incoming data at  3   e - 11  that notifies of reception of data to be transmitted to the terminal  3   e - 01  from the UP GW  3   e - 06 , the SM function  3   e - 05  that belongs to the NW slice  1   3   e - 04  transmits an NG 3  setup request  3   e - 12  to an MM function  3   e - 03 . In this case, the NG 3  setup request  3   e - 12  may include at least one of an address of the UP GW  3   e - 06 , data session that is configured between the terminal  3   e - 01  and the UP GW  3   e - 06  and QoS information, and an IP address of the terminal  3   e - 01  to be used for the data session with the UP GW  3   e - 06 . In this case, the MM function  3   e - 03  to which the NG setup request  3   e - 12  is to be transmitted may be selected using MM function information stored in the SM function  3   e - 05  during the NG 3  release procedure if the terminal  3   e - 01  enters into an idle mode or by other methods. 
         [0253]    After receiving the NG 3  setup request  3   e - 12  from the SM function  3   e - 05 , the MM function  3   e - 03  may transmit paging  3   e - 13  to the terminal  3   e - 01  through base stations including a base station  3   e - 02 . 
         [0254]    The terminal  3   e - 01  configures a connection for wireless resource allocation to the base station  3   e - 02  after checking the existence of data to be received by the terminal itself through reception of the paging  3   e - 13 . Thereafter, the terminal  3   e - 01  transmits to the base station  3   e - 02  a service request  3   e - 14  to be transferred to the MM function  3   e - 03 . 
         [0255]    If the service request  3   e - 14  is received from the terminal  3   e - 01 , the base station  3   e - 02  transmits the service request to the MM function  3   e - 03 , at  3   e - 15 . 
         [0256]    The MM function  3   e - 03  performs authentication and security setup procedure with the terminal  3   e - 01  after receiving the service request at  3   e - 15  from the terminal  3   e - 01  through the base station  3   e - 02 , at  3   e - 16 . 
         [0257]    Through the authentication and security procedure at  3   e - 16 , the MM function  3   e - 03  checks whether the terminal  3   e - 01  is a permitted straight terminal, and then transmits to the base station  3   e - 02  an NG 2 /NG 3  setup request  3   e - 17  for requesting setup of an NG 2 /NG 3  connection. In this case, the NG 2 /NG 3  setup request may be used for NG 3  connection with all NW slices including NW slice  1   3   e - 04  and NW slice  2   3   e - 07 , through which communication was performed before the terminal  3   e - 01  entered into an idle state. For this, the NG 2 /NG 3  setup request may include at least one of an address of the SM function  3   e - 05  that belongs to the NW slice  1   3   e - 04  and an address of the UP GW  3   e - 06 , data session information configured with the UP GW  3   e - 06  and QoS information, an IP address of the terminal  3   e - 01  to be used for communication with the UP GW  3   e - 06 , an address of an SM function  3   e - 08  that belongs to the NW slice  2   3   e - 07  and an address of an UP GW  3   e - 09 , data session information configured with the UP GW  3   e - 09  and QoS information, an IP address of the terminal  3   e - 01  to be used for communication with the UP GW  3   e - 09 , flow information related to data received at  3   e - 10  and QoS information, and PDU session information to which the flow belongs. The PDU session information may be a PDU session identifier. 
         [0258]    As the above-described information, information that the MM function  3   e - 03  received from the SM function  3   e - 05  and the SM function  3   e - 08  when the terminal  3   e - 01  entered into an idle state may be used. 
         [0259]    After receiving the NG 2 /NG 3  setup request  3   e - 17  from the MM function  3   e - 03 , the base station  3   e - 02  performs radio bearer establishment  3   e - 18  that is a wireless resource allocation procedure with the terminal  3   e - 01 . In this case, during the procedure of the radio bearer establishment  3   e - 18 , the base station  3   e - 02  may transfer to the terminal  3   e - 01  at least one of an address of the SM function  3   e - 05  that belongs to the NW slice  1   3   e - 04  that is received from the NG 2 /NG 3  setup request  3   e - 17  and an address of the UP GW  3   e - 06 , data session information configured with the UP GW  3   e - 06  and QoS information, an IP address of the terminal  3   e - 01  to be used for communication with the UP GW  3   e - 06 , an address of the SM function  3   e - 08  that belongs to the NW slice  2   3   e - 07  and an address of the UP GW  3   e - 09 , data session information configured with the UP GW  3   e - 09  and QoS information, an IP address of the terminal  3   e - 01  to be used for communication with the UP GW  3   e - 09 , flow information related to data received at  3   e - 10  and QoS information, and PDU session information to which the flow belongs. 
         [0260]    The terminal  3   e - 01  reconfigures an internal connection of the terminal using information on the NW slice  1   3   e - 04  and the NW slice  2   3   e - 07  transferred by the base station  3   e - 02  during the radio bearer establishment  3   e - 18 , addresses of the SM function and the UP GW function, and allocated session information. 
         [0261]    After completing the radio bearer establishment  3   e - 18  with the terminal  3   e - 01 , the base station  3   e - 02  transmits an NG 2 /NG 3  setup response  3   e - 19  to the MM function  3   e - 03 . 
         [0262]    After receiving the NG 2 /NG 3  setup response  3   e - 19  from the base station  3   e - 02 , the MM function  3   e - 03  transmits NG 3  setup responses  3   e - 20  and  3   e - 22  to SM functions that belong to each NW slice (in this embodiment, SM function  3   e - 05  and SM function  3   e - 08 ). 
         [0263]    As another embodiment of the present disclosure, the base station  3   e - 02  may transmit a separate NG 3  setup response to the SM function  3   e - 05  and the SM function  3   e - 08  for NG 3  connection setup with the UP GW  3   e - 06 . 
         [0264]    The NG 3  setup responses  3   e - 20  and  3   e - 22  to be transmitted may include information related to the corresponding session, such as an address of the base station that is necessary for the NG 3  connection setup and QoS information of wireless resources configured through the radio bearer establishment. 
         [0265]    The SM function  3   e - 05  transmits to the UP GW  3   e - 06  an NG 3  setup response  3   e - 21  for notifying that the NG 3  connection has been configured after receiving the NG 3  setup response  3   e - 20  from the base station  3   e - 02  or the MM function  3   e - 03 . In this case, the NG 3  setup response  3   e - 21  may include information that is necessary for the NG 3  connection, such as an address of the base station  3   e - 02 , QoS information of a flow to transmit the data received at  3   e - 10 , and related session information. 
         [0266]    After receiving the NG 3  setup response  3   e - 21 , the UP GW  3   e - 06  configures the NG 3  connection to the base station  3   e - 02  using information that is included in the NG 3  setup response, and transmits data to the base station  3   e - 02  through the corresponding NG 3  connection, at  3   e - 26 . 
         [0267]    After receiving the NG 3  setup response  3   e - 22  from the base station  3   e - 02  or the MM function  3   e - 03 , the SM function  3   e - 08  transmits an NG 3  setup response  3   e - 23  for notifying the setup of the NG 3  connection to the UP GW  3   e - 09 . In this case, the NG 3  setup response  3   e - 23  may include information that is necessary for the NG 3  connection, such as an address of the base station  3   e - 02  and related session information. 
         [0268]    After receiving the NG 3  setup response  3   e - 23 , the UP GW  3   e - 09  may configure the NG 3  connection to the base station  3   e - 02  using information included in the NG 3  setup response, and may transmit to the SM function  3   e - 08  an NG 3  setup confirm  3   e - 24  for notifying that the corresponding NG 3  connection has been completed. 
         [0269]    After receiving the NG 3  setup confirm  3   e - 24  from the UP GW  3   e - 09 , the SM function  3   e - 08  may transfer the NG 3  setup confirm to the MM function  3   e - 03  at  3   e - 25  to notify the MM function  3   e - 03  that the NG 3  connection has been configured between the base station  3   e - 02  and the UP GW  3   e - 09  of the NW slice  2   3   e - 07 . 
         [0270]      FIG. 3F  exemplifies a procedure in which paging that includes slice information in which data is received is performed with respect to a terminal  3   f - 01  that is in an idle state, and thereafter, the terminal  3   f - 01  performs reconnection with network functions of network slices through which the terminal previously performed data communication in a wireless communication system that supports the network slices according to an embodiment of the present disclosure. 
         [0271]    Referring to  FIG. 3F , if an UP GW  3   f - 06  that belongs to NW slice  1   3   f - 04  receives data to be transmitted to the terminal  3   f - 01 , at  3   f - 10 , it checks session information that can transmit the data to the terminal  3   f - 01 . If the UP GW  3   f - 06  is unable to check the session information of the terminal  3   f - 01  or checks that the session with the terminal  3   f - 01  has been released, it notifies an SM function  3   f - 05  that is connected to the terminal itself that the data has come to the terminal  3   f - 01 , at  3   f - 11 . In this case, information on data sessions may be included therein. The information on the data sessions may be PDU session information and may be a PDU session identifier. 
         [0272]    After receiving a notification of incoming data at  3   f - 11  that notifies of reception of data to be transmitted to the terminal  3   f - 01  from the UP GW  3   f - 06 , the SM function  3   f - 05  that belongs to the NW slice  1   3   f - 04  transmits an NG 3  setup request  3   f - 12  to an MM function  3   f - 03 . In this case, the NG 3  setup request  3   f - 12  may include at least one of an address of the UP GW  3   f - 06 , data session that is configured between the terminal  3   f - 01  and the UP GW  3   f - 06  and QoS information, and an IP address of the terminal  3   f - 01  to be used for the data session with the UP GW  3   f - 06 . In this case, the MM function  3   f - 03  to which the NG setup request  3   f - 12  is to be transmitted may be selected using MM function information stored in the SM function  3   f - 05  during the NG 3  release procedure if the terminal  3   f - 01  enters into an idle mode or by other methods. 
         [0273]    After receiving the NG 3  setup request  3   f - 12  from the SM function  3   f - 05 , the MM function  3   f - 03  may transmit paging  3   f - 13  to the terminal  3   f - 01  through base stations including a base station  3   f - 02 . In this case, the MM function  3   f - 03  may include information that may indicate the NW slice  1   3   f - 04  that includes the UP GW  3   f - 06  in the paging  3   f - 13 . In this case, the information that may indicate the NW slice  1   3   f - 04  may include an ID of an inherent NW slice allocated for each NW slice or a paging ID of a terminal for each NW slice that can discriminate the terminal that can receive paging for each NW slice. 
         [0274]    The terminal  3   f - 01  receives the paging  3   f - 13 , and checks existence of data that the terminal itself should receive from the NW slice  1   3   f - 04 . Thereafter, the terminal  3   f - 01  selects a base station through which the corresponding slice can be connected through checking wireless connection technology related to the NW slice  1  or conditions of the base station, at  3   f - 231 . 
         [0275]    After selecting the base station  3   f - 02  that satisfies the wireless connection technology related to the NW slice  1   3   f - 04  or the conditions of the base station, the terminal  3   f - 01  configures a connection for wireless resource allocation to the base station  3   f - 02 . Thereafter, the terminal  3   f - 01  transmits to the base station  3   f - 02  a service request  3   f - 14  to be transferred to the MM function  3   f - 03 . In this case, the service request  3   f - 14  may include NW slice  1  information (e.g., id of the NW slice or temporary ID of the terminal allocated for each NW slice) or PDU session information (e.g., PDU session identifier). 
         [0276]    The base station  3   f - 02  transfers the service request  3   f - 14  that is received from the terminal  3   f - 01  to the MM function  3   f - 03 , at  3   f - 15 . 
         [0277]    The MM function  3   f - 03  performs authentication and security setup procedure with the terminal  3   f - 01  after receiving the service request at  3   f - 15  that has come from the base station  3   f - 02 , at  3   f - 16 . In this case, the authentication and security setup procedure may include an authorization procedure for authorizing whether to use resources of the NW slice  1   3   f - 04 . 
         [0278]    Through the authentication and security procedure at  3   f - 16 , the MM function  3   f - 03  checks whether the terminal  3   f - 01  is a permitted straight terminal, and then transmits to the base station  3   f - 02  an NG 2 /NG 3  setup request  3   f - 17  for requesting setup of an NG 2 /NG 3  connection. In this case, for the NG 3  connection with the UP GW  3   f - 06  that is included in the NW slice  1   3   f - 04 , the NG 2 /NG 3  setup request may include at least one of information on the NW slice  1   3   f - 04 , an address of the SM function  3   f - 05  that is included in the NW slice  1   3   f - 04 , an address of the UP GW  3   f - 06 , flow information related to data that is received at  3   f - 10  and QoS information, PDU session information to which the flow belongs, and an IP address of the terminal  3   f - 01  to be used for data session with the UP GW  3   f - 06 . The PDU session information may be a PDU session identifier. 
         [0279]    After receiving the NG 2 /NG 3  setup request from the MM function  3   f - 03 , the base station  3   f - 02  performs radio bearer establishment  3   f - 18  that is a wireless resource allocation procedure for data transmission/reception between the terminal  3   f - 01  and the session related to the data that belongs to the NW slice  1   3   f - 04 . In this case, during the procedure of the radio bearer establishment  3   f - 18 , the base station  3   f - 02  may notify the terminal  3   f - 01  of at least one of an information of the NW slice  1   3   f - 04 , an address of the SM function  3   f - 05 , an address of the UP GW  3   f - 06 , flow information related to data that is received at  3   f - 10  and QoS information, PDU session information to which the flow belongs, and an IP address of the terminal  3   f - 01  to be used for data session with the UP GW  3   f - 06 . In an embodiment of  FIG. 3F , the terminal does not configure a connection or a bearer with respect to all slices or all PDU sessions, but may configure a connection only with respect to the slice or PDU session having data to be received. For this, in an embodiment of the present disclosure, slice information or PDU session information may be used. 
         [0280]    After completing the radio bearer establishment  3   f - 18  with the terminal  3   f - 01 , the base station  3   f - 02  transmits an NG 2 /NG 3  setup response  3   f - 19  to the MM function  3   f - 03 . 
         [0281]    As another embodiment of the present disclosure, the base station  3   f - 02  may transmit a separate NG 3  setup response  3   f - 22  to the SM function  3   f - 05  for NG 3  connection setup with the UP GW  3   f - 06 . In this case, the NG 3  setup response  3   f - 22  may include information related to the corresponding session, such as an address of the base station that is necessary for the NG 3  connection setup and QoS information of wireless resources configured through the radio bearer establishment, to be transmitted. 
         [0282]    As another embodiment of the present disclosure, the base station  3   f - 02  does not transmit the NG 3  setup response, and the MM function  3   f - 03  may transmit an NG 3  setup response  3   f - 20  to the SM function  3   f - 05  after receiving the NG 2 /NG 3  setup response  3   f - 19  from the base station  3   f - 02 . 
         [0283]    The SM function  3   f - 05  transmits to the UP GW  3   f - 06  an NG 3  setup response  3   f - 21  for notifying that the NG 3  connection has been configured after receiving the NG 3  setup response  3   f - 20  or  3   f - 22  from the base station  3   f - 02  or the MM function  3   f - 03 . In this case, the NG 3  setup response  3   f - 21  may include information that is necessary for the NG 3  connection, such as an address of the base station  3   f - 02 , QoS information of a flow to transmit the data received at  3   f - 10 , and related session information. 
         [0284]    After receiving the NG 3  setup response  3   f - 21 , the UP GW  3   f - 06  configures the NG 3  connection to the base station  3   f - 02  using information that is included in the NG 3  setup response, and transmits data to the base station  3   f - 02  through the corresponding NG 3  connection, at  3   f - 23 . 
         [0285]    The data that is transmitted to the base station  3   f - 02  is transmitted to the terminal  3   f - 01  using wireless resources configured through the radio bearer establishment  3   f - 18 . 
         [0286]    According to the above-described method according to an embodiment of the present disclosure, if there is information to be transmitted to the terminal that is in an idle state, using slice information or PDU session information, the bearer configuration is not performed with respect to all slices or all PDU sessions, but the connection and bearer configuration are performed only with respect to a slice or a PDU session having data to be transmitted to the terminal, and thus the network can be efficiently operated. 
         [0287]      FIG. 3G  exemplifies a procedure in which paging is performed with respect to a terminal  3   g - 01  that is in an idle state, and thereafter, the terminal  3   g - 01  performs reconnection with network functions of network slices through which the terminal previously performed data communication in a wireless communication system that supports the network slices according to an embodiment of the present disclosure. 
         [0288]    Referring to  FIG. 3G , if an UP GW  3   g - 06  that belongs to NW slice  1   3   g - 04  receives data to be transmitted to the terminal  3   g - 01 , at  3   g - 10 , it checks session information that can transmit the data to the terminal  3   g - 01 . If the UP GW  3   g - 06  is unable to check the session information of the terminal  3   g - 01  or checks that the session with the terminal  3   g - 01  has been released, it notifies an SM function  3   g - 05  that is connected to the terminal itself that the data has come to the terminal  3   g - 01 , at  3   g - 11 . In this case, information on data sessions may be included therein. The information on the data sessions may be PDU session information and may be a PDU session identifier. 
         [0289]    After receiving a notification of incoming data at  3   g - 11  that notifies of reception of data to be transmitted to the terminal  3   g - 01  from the UP GW  3   g - 06 , the SM function  3   g - 05  that belongs to the NW slice  1   3   g - 04  transmits an NG 3  setup request  3   g - 12  to an MM function  3   g - 03 . In this case, the NG 3  setup request  3   g - 12  may include at least one of an information of the NW slice  1   3   f - 04 , address of the UP GW  3   g - 06 , data session that is configured between the terminal  3   g - 01  and the UP GW  3   g - 06  and QoS information, and an IP address of the terminal  3   g - 01  to be used for the data session with the UP GW  3   g - 06 . In this case, the MM function  3   g - 03  to which the NG setup request  3   g - 12  is to be transmitted may be selected using MM function information stored in the SM function  3   g - 05  during the NG 3  release procedure if the terminal  3   g - 01  enters into an idle mode or by other methods. 
         [0290]    After receiving the NG 3  setup request  3   g - 12  from the SM function  3   g - 05 , the MM function  3   g - 03  transmits paging  3   g - 13  to the terminal  3   g - 01  through base stations including a base station  3   g - 02 . 
         [0291]    The terminal  3   g - 01  receives the paging  3   g - 13 , checks existence of data that the terminal itself should receive, and then configures a connection for wireless resource allocation to the base station  3   g - 02 . Thereafter, the terminal  3   g - 01  transmits to the base station  3   g - 02  a service request  3   g - 14  to be transferred to the MM function  3   g - 03 . The base station  3   g - 02  transfers the service request  3   g - 14  that is received from the terminal  3   g - 01  to the MM function  3   g - 03 , at  3   g - 15 . The service request  3   g - 14  may include NW slice  1  information (e.g., id of the NW slice or temporary ID of the terminal allocated for each NW slice) or PDU session information (e.g., PDU session identifier). 
         [0292]    The MM function  3   g - 03  performs authentication and security setup procedure with the terminal  3   g - 01  after receiving the service request at  3   g - 15  that has come from the base station  3   g - 02 , at  3   g - 16 . In this case, the authentication and security setup procedure may include an authorization procedure for authorizing whether to use resources of the NW slice  1   3   g - 04 . 
         [0293]    Through the authentication and security procedure  3   g - 16 , the MM function  3   g - 03  checks whether the terminal  3   g - 01  is a permitted straight terminal, and then transmits to the base station  3   g - 02  an NG 2 /NG 3  setup request  3   g - 17  for requesting setup of an NG 2 /NG 3  connection. In this case, for the NG 3  connection with the UP GW  3   g - 06  that is included in the NW slice  1   3   g - 04 , the NG 2 /NG 3  setup request may include at least one of information on the NW slice  1   3   g - 04 , an address of the SM function  3   g - 05  that is included in the NW slice  1   3   g - 04 , an address of the UP GW  3   g - 06 , flow information related to data that is received at operation  3   g - 10  and QoS information, PDU session information to which the flow belongs, and an IP address of the terminal  3   g - 01  to be used for data session with the UP GW  3   g - 06 . The PDU session information may be a PDU session identifier. 
         [0294]    After receiving the NG 2 /NG 3  setup request from the MM function  3   g - 03 , the base station  3   g - 02  performs radio bearer establishment  3   g - 18  that is a wireless resource allocation procedure for data transmission/reception between the terminal  3   g - 01  and the session related to the data that belongs to the NW slice  1   3   g - 04 . In this case, during the procedure of the radio bearer establishment  3   g - 18 , the base station  3   g - 02  may notify the terminal  3   g - 01  of at least one of an information of the NW slice  1   3   g - 04 , an address of the SM function  3   g - 05 , an address of the UP GW  3   g - 06 , flow information related to data that is received at operation  3   g - 10  and QoS information, PDU session information to which the flow belongs, and an IP address of the terminal  3   g - 01  to be used for data session with the UP GW  3   g - 06 . In an embodiment of  FIG. 3G , the terminal does not configure a connection or a bearer with respect to all slices or all PDU sessions, but may configure a connection only with respect to the slice or PDU session having data to be received. For this, in an embodiment of the present disclosure, slice information or PDU session information may be used. 
         [0295]    After completing the radio bearer establishment  3   g - 18  with the terminal  3   g - 01 , the base station  3   g - 02  transmits an NG 2 /NG 3  setup response  3   g - 19  to the MM function  3   g - 03 . 
         [0296]    As another embodiment of the present disclosure, the base station  3   g - 02  may transmit a separate NG 3  setup response  3   g - 22  to the SM function  3   g - 05  for NG 3  connection setup with the UP GW  3   g - 06 . In this case, the NG 3  setup response  3   g - 22  may include information related to the corresponding session, such as an address of the base station that is necessary for the NG 3  connection setup and QoS information of wireless resources configured through the radio bearer establishment, to be transmitted. 
         [0297]    As another embodiment of the present disclosure, the base station  3   g - 02  does not transmit the NG 3  setup response, and the MM function  3   g - 03  may transmit an NG 3  setup response  3   g - 20  to the SM function  3   g - 05  after receiving the NG 2 /NG 3  setup response  3   g - 19  from the base station  3   g - 02 . 
         [0298]    The SM function  3   g - 05  transmits to the UP GW  3   g - 06  an NG 3  setup response  3   g - 21  for notifying that the NG 3  connection has been configured after receiving the NG 3  setup response  3   g - 20  or  3   g - 22  from the base station  3   g - 02  or the MM function  3   g - 03 . In this case, the NG 3  setup response  3   g - 21  may include information that is necessary for the NG 3  connection, such as an address of the base station  3   g - 02 , QoS information of a flow to transmit the data  3   g - 10 , and related session information. 
         [0299]    After receiving the NG 3  setup response  3   g - 21 , the UP GW  3   g - 06  configures the NG 3  connection to the base station  3   g - 02  using information that is included in the NG 3  setup response, and transmits data to the base station  3   g - 02  through the corresponding NG 3  connection ( 3   g - 23 ). 
         [0300]    The data  3   g - 23  that is transmitted to the base station  3   g - 02  is transmitted to the terminal  3   g - 01  using wireless resources configured through the radio bearer establishment  3   g - 18 . 
         [0301]    According to the above-described method according to an embodiment of the present disclosure, if there is information to be transmitted to the terminal that is in an idle state, using slice information or PDU session information, the bearer configuration or session configuration is not performed with respect to all slices or all PDU sessions, but the connection and bearer configuration are performed only with respect to a slice or a PDU session having data to be transmitted to the terminal, and thus the network can be efficiently operated. 
         [0302]      FIG. 3H  is a diagram illustrating the structure of a terminal according to an embodiment of the present disclosure. 
         [0303]    Referring to  FIG. 3H , a terminal may include a transceiver unit  3   h - 10 , a controller  3   h - 20 , and a storage unit  3   h - 30 . The controller according to the present disclosure may be defined as a circuit, an application specific integrated circuit, or at least one processor. 
         [0304]    The transceiver unit  3   h - 10  may transmit and receive signals with another network entity. The transceiver unit  3   h - 10  may transmit and receive signals under the control of the controller  3   h - 20 . 
         [0305]    The controller  3   h - 20  may control the whole operation of the terminal according to an embodiment proposed in the present disclosure. The controller  3   h - 20  may control the operation of the terminal according to the third embodiment of the present disclosure. For example, the controller  3   h - 20  may control the operation of the terminal as described above with reference to  FIGS. 3A to 3G   
         [0306]    The storage unit  3   h - 30  may store therein at least one of information that is transmitted and received through the transceiver unit  3   h - 10  and information that is generated through the controller  3   h - 20 . Further, the storage unit  3   h - 30  may store therein information and codes for operating the controller  3   h - 20 . 
         [0307]      FIG. 3I  is a diagram illustrating the structure of a base station according to an embodiment of the present disclosure. 
         [0308]    Referring to  FIG. 3I , a base station may include a transceiver unit  3   i - 10 , a controller  3   i - 20 , and a storage unit  3   i - 30 . The controller according to the present disclosure may be defined as a circuit, an application specific integrated circuit, or at least one processor. 
         [0309]    The transceiver unit  3   i - 10  may transmit and receive signals with another network entity. The transceiver unit  3   i - 10  may transmit and receive signals under the control of the controller  3   i - 20 . 
         [0310]    The controller  3   i - 20  may control the whole operation of the base station according to an embodiment proposed in the present disclosure. The controller  3   i - 20  may control the operation of the base station according to the third embodiment of the present disclosure. For example, the controller  3   i - 20  may control the operation of the base station as described above with reference to  FIGS. 3A to 3G   
         [0311]    The storage unit  3   i - 30  may store therein at least one of information that is transmitted and received through the transceiver unit  3   i - 10  and information that is generated through the controller  3   i - 20 . Further, the storage unit  3   i - 30  may store therein information and codes for operating the controller  3   i - 20 . 
         [0312]      FIG. 3J  is a diagram illustrating the structure of an MM function according to an embodiment of the present disclosure. 
         [0313]    Referring to  FIG. 3J , the MM function may include a transceiver unit  3   j - 10 , a controller  3   j - 20 , and a storage unit  3   j - 30 . The controller according to the present disclosure may be defined as a circuit, an application specific integrated circuit, or at least one processor. 
         [0314]    The transceiver unit  3   j - 10  may transmit and receive signals with another network entity. The transceiver unit  3   j - 10  may transmit and receive signals under the control of the controller  3   j - 20 . 
         [0315]    The controller  3   j - 20  may control the whole operation of the MM function according to an embodiment proposed in the present disclosure. The controller  3   j - 20  may control the operation of the MM function according to the third embodiment of the present disclosure. For example, the controller  3   j - 20  may control the operation of the MM function as described above with reference to  FIGS. 3A to 3G   
         [0316]    The controller  3   j - 20  may operate to receive a message that includes session information for a terminal in an idle mode, to transmit a paging message for the terminal based on the message, to receive a service request message for the terminal from a base station, to transmit an interface configuration request message that includes the session information to the base station based on the session information, to receive an interface configuration response message from the base station, and to transmit information for configuring an interface between a UP GW that corresponds to the session information and the base station. In this case, at least one of the interface configuration request message and the service request message may include the session information. The controller  3   j - 20  may operate to configure a connection only with respect to the UP GW that corresponds to the session information among a plurality of UP GW that are connected before the terminal is switched to the idle mode. 
         [0317]    The storage unit  3   j - 30  may store therein at least one of information that is transmitted and received through the transceiver unit  3   j - 10  and information that is generated through the controller  3   j - 20 . Further, the storage unit  3   j - 30  may store therein information and codes for operating the controller  3   j - 20 . 
         [0318]      FIG. 3K  is a diagram illustrating the structure of an SM function according to an embodiment of the present disclosure. 
         [0319]    Referring to  FIG. 3K , the SM function may include a transceiver unit  3   k - 10 , a controller  3   k - 20 , and a storage unit  3   k - 30 . The controller according to the present disclosure may be defined as a circuit, an application specific integrated circuit, or at least one processor. 
         [0320]    The transceiver unit  3   k - 10  may transmit and receive signals with another network entity. The transceiver unit  3   k - 10  may transmit and receive signals under the control of the controller  3   k - 20 . 
         [0321]    The controller  3   k - 20  may control the whole operation of the SM function according to an embodiment proposed in the present disclosure. The controller  3   k - 20  may control the operation of the SM function according to the third embodiment of the present disclosure. For example, the controller  3   k - 20  may control the operation of the SM function as described above with reference to  FIGS. 3A to 3G   
         [0322]    The controller  3   k - 20  may operate to receive information indicating that there is data to be transmitted from a UP GW to a terminal in an idle mode, to transmit an interface configuration request message that includes session information for the terminal to a MM function entity, and to receive from the MM function entity an interface configuration response message that includes information for configuring an interface between the UP GW that corresponds to the session information and a base station. The controller  3   k - 20  may operate to configure a connection only with respect to the UP GW that corresponds to the session information among a plurality of UP GWs that are connected before the terminal is switched to the idle mode. 
         [0323]    The storage unit  3   k - 30  may store therein at least one of information that is transmitted and received through the transceiver unit  3   k - 10  and information that is generated through the controller  3   k - 20 . Further, the storage unit  3   k - 30  may store therein information and codes for operating the controller  3   k - 20 . 
         [0324]    In the detailed embodiments of the present disclosure as described above, the constituent elements included in the present disclosure are described as singular expressions or plural expressions in accordance with the presented embodiments. However, the singular or plural expressions are selected to suit the presented situations for convenience in explanation, and thus the present disclosure is not limited to such singular or plural constituent elements. Even the constituent elements that are expressed by plural expressions may correspond to a singular constituent element, while even the constituent element that is expressed by singular expressions may correspond to plural constituent elements. 
         [0325]    Although detailed embodiments of the present disclosure have been described in the specification and drawings, it will be apparent that various modifications are possible within the scope of the present disclosure. Accordingly, the scope of the present disclosure should not be limited to the embodiments as described above, but should be defined by the appended claims below and those equivalent to the scope of the claims. 
         [0326]    While the present disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.