Service providing method and device using multiple SIM cards

Abstract

An operating method of a first network entity in a wireless communication system may include: receiving a registration request message for a plurality of subscriber identity modules (SIMs) from a terminal; performing a registration process for the plurality of SIMs based on the registration request message; determining a priority among at least one registered SIM; and sending a registration permission message including information related to the priority to the terminal.

Description

Technical Field

[0001] The present disclosure generally relates to wireless communication systems, and to methods and apparatuses for providing services by using multiple Subscriber Identity Modules (SIMs). More specifically, the present disclosure relates to methods and apparatuses for efficiently supporting communication services when a terminal uses multiple pieces of subscription information in a wireless communication system. Background Art

[0002] In order to meet the growing demand for wireless data services after the commercialization of the fourth generation (4G) communication system, considerable efforts have been made to develop pre-fifth generation (pre-5G) communication systems or 5G communication systems. This is one of the reasons why the 5G communication system or pre-5G communication system is called a beyond-4G network communication system or a post-long term evolution (LTE) system. In order to achieve high data rates, the 5G communication system is being developed to be implemented in ultra-high frequency bands (millimeter waves (mmWave)) (e.g., 60 GHz band). In order to reduce the path loss of such ultra-high frequency band radio waves and increase the transmission distance of radio waves in the 5G communication system, various technologies have been discussed and are being studied, such as: beamforming, massive multiple-input multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antennas. In order to improve the system network of the 5G communication system, various technologies have been developed, such as evolved small cells, advanced small cells, cloud radio access networks (Cloud-RAN), ultra-dense networks, device-to-device communication (D2D), wireless backhaul, mobile networks, cooperative communication, coordinated multi-point (CoMP), and interference cancellation. In addition, for the 5G communication system, other technologies have been developed, such as hybrid frequency shift keying (FSK) and quadrature amplitude modulation (QAM) (FQAM) as advanced coding and modulation (ACM) schemes and sliding window superposition coding (SWSC), as well as filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) as advanced access schemes.

[0003] The Internet has evolved from a human-based connected network where humans create and consume information to the Internet of Things (IoT), in which distributed components (e.g., objects) exchange information with each other for processing. The Internet of Everything (IoE) is emerging, combining IoT-related technologies with technologies for processing big data, such as those connecting to cloud servers. Implementing the IoT requires various technical components, such as sensing, wired / wireless communications and network infrastructure, service interface technologies, and security technologies. In recent years, research has focused on technologies such as sensor networks connecting objects, machine-to-machine (M2M) communications, and machine-type communications (MTC). Within the IoT, intelligent Internet technology (IT) services can be provided to collect and analyze data acquired from interconnected objects, thereby creating new value for human life. With the convergence and integration of existing information technology (IT) technologies and various industries, the IoT can be applied to various fields, such as smart homes, smart buildings, smart cities, smart cars (connected vehicles), smart grids, healthcare, smart appliances, and premium medical services.

[0004] Efforts are underway to apply 5G communication systems to IoT networks. For example, technologies related to sensor networks, machine-to-machine communication, and machine-to-communication (MTC) are being implemented using 5G communication technologies, including beamforming, multiple-input multiple-output (MIMO), and array antennas. The application of cloud radio access networks (RANs) as big data processing technologies, as described above, may be an example of the convergence of 5G communication and IoT technologies.

[0005] As described above, as wireless communication systems develop, various services can be provided, and thus a method of seamlessly providing such services is required. Summary of the Invention

[0006] Technical issues

[0007] The embodiments provide an apparatus and method for efficiently providing services in a wireless communication system.

[0008] Technical Solution

[0009] According to an embodiment of the present disclosure, an operating method of a first network entity in a wireless communication system may include: receiving a registration request message regarding multiple subscriber identity modules (SIMs) from a terminal; performing a process of registering the multiple SIMs based on the registration request message; determining a priority among at least one registered SIM; and sending a registration acceptance message including priority information to the terminal.

[0010] Beneficial technical effects

[0011] The embodiments provide an apparatus and method for efficiently supporting services in a wireless communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a diagram illustrating a fifth generation (5G) system structure according to an embodiment of the present disclosure.

[0013] Figure 2 is a diagram for describing a method for a terminal to process multiple subscription information according to an embodiment of the present disclosure.

[0014] Figure 3 is a flowchart for describing a method for multiple subscriber identity modules (SIMs) to process services according to an embodiment of the present disclosure.

[0015] Figure 4 is a diagram for describing a method of determining priorities among a plurality of SIMs during generation of a protocol data unit (PDU) session according to an embodiment of the present disclosure.

[0016] Figure 5 is a diagram for describing a method of controlling a terminal according to an embodiment of the present disclosure.

[0017] Figure 6 is a diagram for describing a SIM control method of a terminal according to an embodiment of the present disclosure.

[0018] Figure 7 is a diagram for describing a method of controlling services in a case where a plurality of SIMs are managed by different systems according to an embodiment of the present disclosure.

[0019] Figure 8 is a diagram for describing a method of searching for a system to which a SIM of a terminal has been registered according to an embodiment of the present disclosure.

[0020] Figure 9 is a diagram illustrating a configuration of a network entity according to an embodiment of the present disclosure.

[0021] Figure 10 is a diagram illustrating a configuration of a terminal according to an embodiment of the present disclosure.

[0022] Figure 11 is a flowchart for describing an operation method of a network entity according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0023] The terms used in this disclosure are only used to describe specific embodiments and may not be intended to limit the scope of other embodiments. The expression used in the singular may include the expression in the plural form, unless it has a significantly different meaning in the context. The terms used herein (including technical or scientific terms) may have the same meanings as those of ordinary skill in the art described in this disclosure are generally understood. Among the terms used in the present invention, the terms defined in the general dictionary may be interpreted as having the same or similar meaning in the context of the relevant technology, unless the disclosure is clearly defined, these terms are not ideally or are interpreted with too formal a meaning. In some cases, even the terms defined in the present disclosure can not be interpreted as excluding embodiments of the present disclosure.

[0024] In the various embodiments of the present disclosure described below, hardware methods are described as examples. However, because the various embodiments of the present disclosure include technologies that use both hardware and software, the various embodiments of the present disclosure do not exclude software-based methods. For example, even when a network function (NF) is implemented in software rather than hardware, is virtualized, or operates in the cloud, the embodiments of the present disclosure can be applied.

[0025] The present disclosure hereinafter relates to a method and apparatus for supporting various services in a wireless communication system. Specifically, the present disclosure describes a technique for efficiently supporting various services in a wireless communication system when a terminal includes multiple pieces of subscription information. A terminal including multiple pieces of subscription information is implemented by a terminal including two or more subscriber identity modules (SIMs) storing subscription information, each of which can be embedded in a physical card (e.g., a universal integrated circuit card (UICC), implemented in software form, or implemented in a combination thereof. Therefore, when describing the embodiments of the present disclosure, subscription information and SIM can be used synonymously.

[0026] SIM stands for Access Control Module for accessing the network of a mobile network operator. When a SIM card is used by being embedded in a terminal, it is called a Universal SIM card (USIM). In addition, the UICC including the USIM can also be collectively referred to as a USIM card. Similarly, the UICC including the SIM can also be collectively referred to as a SIM card. In addition, the terminal can download and select a SIM card by using the UICC card. In this disclosure, for the sake of convenience, the modules that provide access control functions for accessing the network of a mobile network operator are collectively referred to as SIMs.

[0027] In addition, for the convenience of description, the terms used herein to identify access nodes, terms indicating network entities or NFs, terms indicating messages, terms indicating interfaces between network entities, terms indicating various types of identification information, etc. are exemplified. Therefore, the terms used in the present disclosure are not limited, and other terms indicating objects having the same technical meaning may be used.

[0028] In the following, for convenience of description, the present disclosure uses terms and names defined by the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) and the 5th Generation (5G) standards. However, the present disclosure is not limited to these terms and names and can be equally applied to systems conforming to other standards.

[0029] Figure 1 2 is a structural diagram of a 5G system according to an embodiment of the present invention.

[0030] Reference Figure 1 , Access and Mobility Management Function (AMF) is the NF that manages wireless network access and mobility with respect to terminals (User Equipment (UE)). Session Management Function (SMF) is the NF that manages sessions with respect to terminals, and session information includes Quality of Service (QoS) information, charging information, and information about packet processing. User Plane Function (UPF) is the NF that processes user plane services and can be controlled by SMF. Although Figure 1 Although not shown in the figure, the 5G system may include an unstructured data storage network function (UDSF), where the UDSF is an NF that stores unstructured data and can store or retrieve any type of data according to the request of the NF.

[0031] In addition, refer to Figure 1 , showing the Network Slice Selection Function (NSSF) for network slice selection, the Network Exposure / Repository Function (NEF / NRF) that provides NF information, the Policy Control Function (PCF) for policy control, the User Data Management (UDM) for user data management, the Application Function (AF) for application control, the Authentication Server Function (AUSF) related to terminal authentication, the Service Communication Agent (SCP) related to communication services, and the Data Network (DN) for data transmission.

[0032] Figure 2 is a diagram for describing a method in which a terminal processes multiple pieces of subscription information according to an embodiment of the present disclosure.

[0033] According to an embodiment of the present disclosure, it is possible to support a situation where a terminal uses two or more subscription information, but for the sake of convenience, the situation where two subscription information are used will be described. In other words, it is obvious that the method described below can be applied to the situation where two or more subscription information are used.

[0034] refer to Figure 2 In the case of (1) passive, only one of the two SIMs may be allowed to be used at a time. In other words, based on the information stored in the terminal or the user configuration, only one of the two SIMs is used, and when the other SIM is selected, the existing SIM is not used.

[0035] In addition, refer to Figure 2 In the case of (2) mixed standby, two SIMs can be used at the same time, but communication operation can be applied to one SIM at a time, and the other SIM without communication operation can be inactive. Inactive may indicate that a registration or attachment process or an authentication process is performed by using the SIM to communicate with the network, but transmission / reception of user plane traffic is not performed. Figure 2 (3) In the case of dual receiver standby, one of the two SIMs can perform both transmission and reception, while the other SIM can only receive. Figure 2 In case of (4) activation, two SIMs can perform both sending and receiving.

[0036] The present disclosure relates to (2) hybrid standby and (3) dual receiver standby, in which two SIM cards are registered to the network at the same time and thus maintain a communicative state. Specifically, the terminal can use only one SIM card to perform transmission and reception at a time ((2) hybrid standby), or can use only one SIM card to perform transmission and reception at a time and use the other SIM card to perform reception at the same time ((3) dual receiver standby). At the same time, in the above-mentioned (2) and (3) cases, the following situations may occur when the terminal accesses the network and communicates.

[0037] 1) When a traffic related to one SIM (second SIM) occurs while data is being sent / received to / from another SIM (first SIM), QoS may deteriorate because the second SIM cannot send or receive traffic.

[0038] 2) When paging occurs in one SIM while data is being transmitted to / from another SIM (first SIM), QoS may deteriorate and resources may be wasted because the other SIM cannot receive the paging or transmit a response to the paging.

[0039] 3) When traffic occurs in the second SIM while data is transmitted / received to / from the first SIM and traffic transmission / reception with respect to the first SIM is to be stopped to process traffic in the second SIM, QoS may deteriorate.

[0040] Figure 3 is a flowchart for describing a method for multiple SIM cards to process services according to an embodiment of the present disclosure.

[0041] In operation 310, the terminal (UE) may perform a registration or attachment procedure on the network using a first SIM. The order or priority between SIMs may be determined using a user configuration, a configuration of each SIM, or information stored in the terminal. The registration or attachment request message sent by the terminal may include information indicating that the terminal has the ability to support multiple SIMs (multi-SIM (MUSIM) capability indication) and may include the priority of the SIM currently being registered among the multiple SIMs.

[0042] In operation 320, the core network, in particular, the NF supporting registration and mobility management regarding the terminal (AMF in 5G, Mobility Management Entity (MME) in 4G) processes the registration request received from the terminal in operation 310, and receives subscription information about the SIM requesting registration from the NF (UDM in 5G, Home Subscriber Server (HSS) in 4G). The subscription information may include information about whether to accept multiple SIM operations of the corresponding user, and when accepting multiple SIM operations, the subscription information may include information about SIMs that are accessible at the same time as the corresponding SIM. In addition, the subscription information may include access priority about the corresponding SIM. The AMF or MME may process the registration request regarding the corresponding terminal and SIM by using the subscription information and registration request of the terminal. At this time, the access priority regarding the corresponding SIM may be determined, and in order to determine the access priority regarding the corresponding SIM, at least one of the access priority received from the terminal and the access priority included in the subscription information may be considered. Although in Figure 3 (not shown in the figure), the AMF or MME may send information about whether the network supports multiple SIM operations or whether multiple SIM operations for the terminal are accepted to the terminal by adding the information to the registration or attachment acceptance message. In addition, the access priority determined for the corresponding SIM may be included in the registration acceptance message.

[0043] In operation 330, the terminal may perform a registration or attachment process on the network by using a second SIM. The second SIM refers to a SIM that is different from the first SIM, and the order or priority between the SIMs may be determined by using a user configuration, a configuration of each SIM, or information stored in the terminal. The registration or attachment request message sent by the terminal may include information indicating that the terminal has the ability to support multiple SIMs (MUSIM capability indication), and may also include the priority of the SIM currently registered among the multiple SIMs. In addition, when sending a registration request for the second SIM, the terminal may include a temporary identity (in 5G, 5G-GUTI (Globally Unique Temporary Identity) and in 4G, GUTI) assigned to the first SIM registered in operations 310 and 320.

[0044] The core network, in particular, the NF that supports registration and mobility management of the terminal (AMF in 5G and MME in 4G) can process the registration request received from the terminal in operation 330. Only when the core network NF (AMF or MME) that processes the registration of the first SIM and the core network NF that processes the registration of the second SIM are the same, can the services and paging procedures for the first SIM and the second SIM be coordinated. In addition, the terminal can provide information when performing the registration request for the second SIM so that the same NF is selected for the first SIM and the second SIM. Here, the terminal can send the identity of the core network NF when configuring the connection with the base station (radio resource control (RRC) connection) by using the temporary identity of the first SIM sent to the core network NF during the registration process, or the terminal can perform redirection when the core network NF needs to be changed.

[0045] In operation 340, the core network NF may receive subscription information about the SIM that requests registration from the NF that stores the subscription information (UDM in 5G, HSS in 4G). The subscription information may include information on whether multiple SIM operations are accepted for the corresponding user, and when multiple SIM operations are accepted for the corresponding SIM, the subscription information may include information on SIMs that are accessible at the same time as the corresponding SIM. In addition, the subscription information may include access priority about the corresponding SIM. The AMF or MME may process the registration request about the SIM and the terminal by using the subscription information and the request of the terminal. Here, the access priority of the corresponding SIM may be determined, and one or more of the access priority received from the terminal or the access priority included in the subscription information may be considered. Although in Figure 3 Although not shown, the AMF or MME may send information about whether the network supports multiple SIM operations or whether the terminal accepts multiple SIM operations to the terminal by adding the information to the Registration or Attach Accept message. Furthermore, information about the number of SIMs currently registered with the network may be sent to the terminal by adding the information to the Registration Accept message. Furthermore, the access priority determined for the corresponding SIM may be included in the Registration Accept message.

[0046] At operation 350, the core network NF may store the priority information regarding the corresponding SIM in the received subscription information. The terminal and the network include information indicating that two or more SIMs have registered with the network and can identify the access priority of each SIM. Then, at operation 360, when traffic or signaling occurs, the terminal and the network may process the traffic or signaling taking into account the access priority of each SIM and the operating state of each SIM (active / inactive or RRC connected / idle state, etc.). For example, while transmitting / receiving data for a first SIM, when traffic occurs and a paging request for a second SIM needs to be processed, if the priority of the second SIM to be paging is low, the paging request for the second SIM may be delayed until the data transmission for the first SIM is complete. Alternatively, if the priority of the second SIM to be paging is high, the data transmission for the first SIM may be stopped (RRC release), and the second SIM may send the paging request first. For ease of description, the priority between the first and second SIMs has been described, but the operations for the first and second SIMs are not limited to the above example, and it is apparent that the above operations can be performed for two or more SIMs. Furthermore, the terminal and the network may obviously perform the above operations taking into account not only the priority of the paging but also the priority of the scheduling request (SR).

[0047] Figure 4 is a diagram for describing a method of determining priorities among a plurality of SIMs during generation of a protocol data unit (PDU) session according to an embodiment of the present disclosure.

[0048] refer to Figure 4 , the priority is not determined in the process of performing registration for each SIM, but the priority between multiple SIMs can be determined in the process of generating a PDU session (or public data network (PDN) connection).

[0049] In operation 410, the terminal (UE) may send a session (PDU session or PDN connection) generation request to the network by using the first SIM. Here, the order or priority of the sessions to be generated may be determined by using user configuration, data network name (DNN), configuration of each SIM, or information stored in the terminal. The session generation request message sent by the terminal may include information indicating that the terminal has the ability to support multiple SIMs (MUSIM capability indication), and may also include the access priority of the target DNN (in 4G networks, access point name (APN)) and the access priority of the currently requested session.

[0050] In operation 420, the core network - specifically, the NF supporting session management regarding the terminal (in 5G, SMF, in 4G, MME) may process a registration request received from the terminal, and when processing the registration request, when subscription information is to be received, the core network receives subscription information regarding the SIM from the NF (in 5G, UDM; in 4G, HSS). The subscription information regarding the SIM may include information regarding whether multiple SIM operations are accepted for the corresponding user, and when multiple SIM operations are accepted, the subscription information may include information regarding SIMs that are accessible simultaneously with the corresponding SIM. In addition, the subscription information regarding the SIM may include access priority regarding the corresponding SIM or session. The SMF or MME may process the corresponding session generation process by using the subscription information and the request of the terminal. Here, the access priority regarding the session may be determined, and in order to determine the access priority regarding the session, one or more of the access priority received from the terminal, the access priority of the user (SIM) included in the subscription information, and the access priority of the session (DNN / APN) included in the subscription information may be considered. Although in Figure 4 (Not shown in the figure), the SMF or MME may send a session creation accept message to the terminal, which includes information about whether the network supports multiple SIM operations or whether multiple SIM operations for the terminal are accepted. In addition, the access priority determined for the corresponding session may be included in the session creation accept message. In addition, the SMF or MMF may send the above information to another NF (AMF or UPF in the case of SMF, and Server Gateway (SGW) in the case of MME).

[0051] In operation 430, the terminal may send a session (PDU session or PDN connection) generation request to the network by using the second SIM. Here, the order or priority of the sessions to be generated may be determined using user configuration, DNN, configuration of each SIM, or information stored in the terminal. In addition, the information (target DNN / APN) of the session requested in operation 430 may be configured to be different from the information used in operations 410 and 420. The session generation request message sent by the terminal may include information indicating that the terminal has the ability to support multiple SIMs (MUSIM capability indication), and may include the access priority of the target DNN and the access priority of the currently requested session.

[0052] In operation 440, the core network - specifically, the NF supporting session management regarding the terminal (in 5G, SMF, in 4G, MME) may process the registration request received from the terminal, and when processing the registration request, when subscription information is to be received, the core network receives subscription information regarding the SIM from the NF storing the subscription information (in 5G, UDM; in 4G, HSS). The subscription information regarding the SIM may include information regarding whether the corresponding user accepts multiple SIM operations, and when multiple SIM operations are accepted, the subscription information may include information regarding the SIM accessed simultaneously with the corresponding SIM. In addition, the subscription information regarding the SIM may include access priority regarding the corresponding SIM or session. The SMF or MME may process the corresponding session generation process by using the subscription information and the request of the terminal. In this process, the access priority regarding the corresponding session is determined, and at this time, one or more of the access priority received from the terminal, the user (SIM) access priority contained in the subscription information, and the access priority (DNN / APN) of the session included in the subscription information may be considered. Although in Figure 4 (Not shown in the figure), the SMF or MME may send information to the terminal by including information about whether the network supports multiple SIM operations or whether the terminal accepts multiple SIM operations in a session accept message. In addition, the access priority determined for the corresponding session may be included in the session creation accept message. In addition, the SMF or MMF may send the above information to another NF (AMF or UPF in the case of SMF, and Server Gateway (SGW) in the case of MME).

[0053] In operation 450, the terminal and the network include information indicating that two or more SIMs have been registered in the network, and can identify the access priority of each session. In operation 460, when a service or signaling occurs, the terminal and the network can process the service or signaling in consideration of the access priority of each session and the operating state of each session of each SIM (active / inactive or RRC connected / idle state, etc.). For example, when a service occurs while data on a session of a first SIM is being transmitted / received and a paging on a second SIM needs to be processed, if the priority of sending the paging is lower than the priority of the session of the first SIM, the paging transmission can wait until the data transmission of the first SIM is completed. Alternatively, when the priority of the session for sending the paging is high, the data transmission of the first SIM can be stopped (RRC release) and the second SIM can send the paging first.

[0054] Meanwhile, the priority of each SIM or session can be set in the following order: A small value represents a high priority and can indicate a relative priority.

[0055] 1) SIM or session used for emergency services or emergency calls (e.g., DNN / APN for emergency services)

[0056] 2) SIM or session for voice or image call services (e.g., DNN / APM for Internet Protocol (IP) Multimedia Subsystem (IMS))

[0057] 3) SIM or session for other common data services (e.g. DNN / APN for Internet)

[0058] When a terminal uses two or more SIM cards, these SIM cards can be registered to different radio access technologies (RATs). For example, one SIM card can be registered to 5G and another SIM card can be registered to 4G. According to an embodiment of the present disclosure, multiple SIM cards can be handled in the following situations: The user configures one SIM card to operate in 5G and the other SIM card to operate in 4G.

[0059] -One SIM switches to 4G network according to wireless status

[0060] -One SIM switches to 4G network (fallback) based on service availability

[0061] Figure 5 is a diagram for describing a control method of a terminal (UE) according to an embodiment of the present disclosure.

[0062] In operation 510, the terminal may perform a registration or attachment procedure on the network using the first SIM. The order or priority between the SIMs may be determined by using a user configuration, a configuration of each SIM, or information stored in the terminal. The registration or attachment request message sent by the terminal may include information indicating that the terminal has the ability to support multiple SIMs (MUSIM capability indication) and may include the priority of the SIM for the current registration among the multiple SIMs.

[0063] In operation 520, the core network—specifically, a NF supporting registration and mobility management for the terminal (SMF in 5G, MME in 4G)—may process the registration request received from the terminal in operation 510 and receive subscription information about the SIM card requested to be registered in this process from a NF storing subscription information (UDM in 5G, HSS in 4G). The subscription information may include information about whether multiple SIM card operations are accepted for the corresponding user, and if multiple SIM card operations are accepted, the subscription information may include information about SIM cards that are simultaneously accessible with the corresponding SIM card. Furthermore, the subscription information may include access priority for the corresponding SIM card. Furthermore, the subscription information about the SIM card requested to be registered may include information about whether the corresponding SIM card is allowed to access a wireless network (5G, 4G, 3G, etc.) or a core network (5G Core (5GC) or Evolved Packet Core (EPC)). The AMF or MME may process the registration request for the SIM card and the terminal using the subscription information and the terminal's request. The access priority for the corresponding SIM may be determined while processing the registration request, taking into account one or more of the access priority received from the terminal or the access priority included in the subscription information. Figure 5 Not shown in the figure, the AMF or MME may send a registration or attachment accept message to the terminal, which includes information about whether the network supports multiple SIM operations or whether multiple SIM operations on the terminal are accepted. In addition, the access priority determined for the corresponding SIM may be included in the registration accept message. In addition, the registration accept message may include information about the wireless networks (5G, 4G, 3G, etc.) or core networks (5GC or EPC) available to the user registered to the terminal (i.e., the user indicated by the corresponding SIM).

[0064] The remaining procedures in the process for registering the first SIM are performed (operation 530), and in operation 540, the terminal may perform a registration or attachment procedure on the network by using the second SIM. The second SIM refers to a SIM different from the SIM (first SIM) used in operation 1, and the order or priority between the SIMs may be determined by using user configuration, configuration of each SIM, or information stored in the terminal. The registration or attachment request message sent by the terminal may include information indicating that the terminal has the ability to support multiple SIMs (MUSIM capability indication), and may include the priority of the currently registered SIM among several SIMs. In addition, when sending the registration request for the second SIM, the terminal may include a temporary identity (in 5G, 5G-GUTI; in 4G, GUTI) allocated to the first SIM registered in operations 510 and 520.

[0065] In operation 540, the core network - in particular, the NF supporting registration and mobility management for the terminal (AMF in 5G; MME in 4G) may process the registration request received from the terminal. Only when the core network NF (AMF or MME) that processes the registration for the first SIM and the core network NF that processes the registration for the second SIM are the same, can the services and paging procedures for the first SIM and the second SIM be coordinated, and the terminal may provide information during the registration request for the second SIM so as to select the same NF for the first SIM and the second SIM. Here, the terminal may send the identity of the core network NF when configuring a connection with a base station (radio resource control (RRC) connection) by using the temporary identity of the first SIM sent to the core network NF during the registration process, or the terminal may perform redirection when a change of the core network NF is required.

[0066] At operation 550, the core network NF may receive subscription information about the SIM card that requested registration from a NF storing subscription information (UDM in 5G; HSS in 4G). The subscription information may include information about whether multiple SIM card operations are accepted for the corresponding user. If multiple SIM card operations are accepted for the corresponding SIM card, the subscription information may include information about SIM cards that can be accessed simultaneously with the corresponding SIM card. Furthermore, the subscription information may include access priority for the corresponding SIM card. Furthermore, the subscription information may include information about whether the corresponding SIM card is allowed to access a wireless network (5G, 4G, 3G, etc.) or a core network (5GC or EPC).

[0067] In operation 560, the AMF or MME may process the registration request regarding the SIM and the terminal by using the subscription information and the request of the terminal. In this process, the access priority of the corresponding SIM may be determined, and one or more of the access priority received from the terminal or the access priority included in the subscription information may be considered. When determining whether to accept the registration regarding the terminal or whether to redirect the terminal to a wireless network and core network allowed to the terminal or another wireless network or NF, the AMF or MME may consider whether the registration request of the terminal is generated for two or more SIMs for one terminal. When the terminal is registered with two or more SIMs, if possible, the AMF or MME processes the terminal to be registered with one core network, which is to improve service quality or performance by having one AMF or MME handle registration, mobility, and paging management related to the terminal.

[0068] In operation 570, when the wireless network or core network on which the terminal performs the current registration request needs to be changed, the AMF or MME may change the wireless network or core network during the registration process to trigger the second SIM to access the same wireless network or core network as the first SIM. Figure 5Not shown in the figure, during this process, the AMF or MME may send information to the terminal by adding information about whether multiple SIM operations are supported in the network or whether the terminal accepts multiple SIM operations to the registration or attachment acceptance message. In addition, the information about the number of SIMs simultaneously registered in the current network may be added to the registration acceptance message to send the information to the terminal. In addition, the access priority determined for the corresponding SIM may be included in the registration acceptance message. The registration acceptance message may include information about the wireless network (5G, 4G, 3G, etc.) or core network (5GC or EPC) available to the registered terminal.

[0069] In operation 580, the terminal and the network include information indicating that two or more SIMs have been registered in the network, and can identify the access priority of each SIM. In addition, the two SIMs of the terminal can be registered in the same core network NF (AMF or MME) and managed by the same core network NF (AMF or MME). Then, when a service or signaling occurs, the terminal and the network can consider the access priority of each SIM and the operating state of each SIM (active / inactive or RRC connected / idle state, etc.) to process the service or signaling. For example, while sending / receiving data with respect to the first SIM, when a service occurs with respect to the second SIM and paging needs to be processed, if the priority of the second SIM to which the paging is to be sent is low, the paging transmission of the second SIM can wait until the data transmission of the first SIM is completed. Alternatively, when the priority of the second SIM to which the paging is to be sent is high, the data transmission of the first SIM can be stopped (RRC release) and the paging can be sent first.

[0070] Figure 6 is a diagram for describing a SIM control method of a terminal (UE) according to an embodiment of the present disclosure.

[0071] In operation 610, when two SIM cards of a terminal are registered with the same core network and receive services, one SIM card may be switched to another core network. This may occur during a control process based on the wireless network status or a specific service type (fallback for voice / emergency calls, etc.).

[0072] In operation 620, the AMF or MME may determine whether it is necessary to change the system (core network) of another SIM when the access system (core network) of one SIM is changed. Here, the AMF or MME may consider the priority of each SIM or the session generated in each SIM.

[0073] In operation 630, when it is necessary to manage the second SIM in the same system (core network) as the first SIM, the AMF or MME may trigger a process for changing the system to which the second SIM of the terminal is registered. Here, the RRC connection with the terminal is disconnected, a command to induce redirection is sent to the base station and the terminal, and the access priority (radio access type / frequency selection priority, radio frequency selection priority (RFSP) index) of the terminal is adjusted.

[0074] Meanwhile, the AMF or MME controlling the terminal in operations 620 and 630 may be the AMF or MME with which the terminal has been registered.

[0075] At operation 640, the second SIM of the terminal may also perform a process for receiving services by registering in the same system (core network) as the first SIM. This may correspond to a mobility update registration or tracking area update process.

[0076] Figure 7 is a diagram for describing a method of controlling services in a case where a plurality of SIMs are managed by different systems according to an embodiment of the present disclosure.

[0077] In detail, Figure 7 is a diagram for describing a method of controlling services in a case where multiple SIMs have been registered to a network by using one terminal (UE) but the multiple SIMs are managed by different systems (core network).

[0078] At operation 710, a first SIM card of a terminal may be registered with a system. For ease of description, it is assumed that the first SIM card has been registered with the core network NF1 (eg, AMF).

[0079] At operation 711, the second SIM card of the terminal may be registered with another system. For ease of description, it is assumed that the second SIM card has been registered with the core network NF2 (eg, MME). It is assumed that both core networks know that the terminal is running with two SIM cards.

[0080] In operation 720, the first SIM of the terminal may be in a connected state to transmit / receive traffic.

[0081] In operation 730 , downlink data may occur in a session of the second SIM of the terminal or a situation requiring signaling may occur.

[0082] In operation 740, the core network NF2 may determine that the state of the terminal is in the idle state, but the terminal operates in two or more SIMs.

[0083] In operation 750 , to determine whether the first SIM of the terminal is currently communicating, the core network NF 2 may inquire of the UDM or HSS about information of the core network NF with which the first SIM of the terminal has been registered.

[0084] In operation 760, the UDM or HSS may transmit an identifier of a name, address, or IP address, etc., of the NF (ie, AMF or MME) to which the first SIM of the terminal has been registered.

[0085] At operation 770, core network NF 2 may use the received information to identify core network NF 1, to which the terminal's first SIM card is registered, and request core network NF 1 to transmit information indicating that a service has occurred for the terminal. When determining whether to transmit the information and when to transmit it, the core network may consider each SIM card and its service priority. Furthermore, the message transmitted by core network NF 2 may include a full paging message, rather than a simple service occurrence notification.

[0086] In operation 771, the core network NF1 may send an alarm indicating that a service related to the second SIM has occurred to the currently accessed terminal (ie, the first SIM) by using the received information. The alarm or paging sent to the terminal may include a service type or priority for each service.

[0087] In operation 772, depending on the implementation or internal structure of the terminal, the service alert information received by the first SIM card may be sent to the controller that processes the second SIM card. Here, the controller may determine which SIM card to process the transmission / reception first for each service related to the first SIM card and the second SIM card, and may consider the priority information received in operation 771.

[0088] In operation 780 , the terminal may recognize the occurrence of the service with respect to the second SIM of the terminal and perform an operation for resuming the service.

[0089] Figure 8 is a diagram for describing a method of searching for a system to which a SIM of a terminal (UE) has been registered according to an embodiment of the present disclosure.

[0090] At operation 810, the first SIM of the terminal may be registered with the system. For ease of description, it is assumed that the first SIM has been registered with the core network NF1 (eg, AMF).

[0091] At operation 811, the second SIM of the terminal may be registered with another system. For ease of description, it is assumed that the second SIM has been registered with the core network NF 2 (e.g., MME). When the terminal sends a registration request message (registration / attachment or tracking area update request), it may add information indicating that the terminal has the ability to support multiple SIMs (MUSIM capability indication) and a temporary identity (5G-GUTI or GUTI) allocated when registering another SIM in the registration request message.

[0092] In operation 820, core network NF 2 may determine that the terminal is operating with multiple SIMs while processing the terminal's registration request and, using the temporary identifier received during the registration request, identify the core network NF (in the current embodiment, core network NF 1) to which the first SIM is already registered. Core network NF 2 needs to identify the subscription identifier (Subscriber Permanent Identifier (SUPI) or International Mobile Subscriber Identity (IMSI)) of the terminal's first SIM in order to locate the NF to which the first SIM is already registered for future traffic, services, and paging processing. As described above, the subscription identifier of the first SIM can be determined by querying the UDM or HSS for information about the NF to which the terminal's other SIM is already registered. The UDM or HSS may store the corresponding information based on the subscription identifier. Core network NF 2 may send a message (identity or context request) to the identified core network NF (in the current embodiment, core network NF 1) requesting the subscription identifier of the terminal's first SIM. This message may include the temporary identifier of the other SIM received from the terminal. Furthermore, this message may include the subscription identifier of the terminal's second SIM to be registered, informing core network NF 2 in advance. Additionally, the message may include an indication that the identification / information request is for handling multiple SIM cards in one terminal rather than for mobility management.

[0093] At operation 830, core network NF 1 may process the received request message. Core network NF 1 may search the UE context corresponding to the temporary identity of the terminal included in the request message to obtain the subscription identity. If the request message includes second SIM information of the same terminal registered with core network NF 2, the second SIM information may be stored as another SIM information for multiple SIM operation of the terminal.

[0094] At operation 840, core network NF1 may send the subscription identity (SUPI or IMSI) of the terminal's first SIM card (registered with core network NF1) to core network NF2. The message used in this case may be an indication or context response message. Unlike a general identity response or context response generated during mobility management, an identity or context response message is used to send a subscription identity, and the context associated with the terminal may not be deleted because services associated with the registered terminal still need to be provided even after the response.

[0095] In operation 850, the core network NF2 may store the information of the first SIM of the same terminal received from the core network NF1 as other SIM information regarding a multiple SIM operation of the terminal.

[0096] In operation 860, the core network NF may verify the subscription identity of another SIM of the terminal registered thereto. When it is necessary to find another core network NF to which another SIM is registered for service processing, paging processing, etc., the core network NF may send a request to the UDM / HSS for obtaining the identity, name, and address of the other core network NF (to which the SIM is registered) by using the stored subscription identity of the other SIM.

[0097] At the same time, according to another embodiment of the present disclosure, when the core network NF to which another SIM is registered changes, each core network NF can perform a notification for receiving information about the change and information (identity, name, address, etc.) of the core network NF after the change. Subscription can be performed by the core network NF via the UDM / HSS using a subscription identity for a specific SIM. When the core network NF to which the specific SIM is registered changes, the UDM / HSS can send a notification to the core network NF that subscribes to such information. In addition, subscription can be performed directly and mutually between core network NFs. In this case, when the core network NF changes (for example, when the terminal is registered with AMF#1 and then the registration changes to AMF#2 due to mobility or the like), and the MME change alarm subscribed to the core network NF is received, AMF#1 or AMF#2 can notify the MME of the terminal's registration change to AMF#2.

[0098] like Figure 9 As shown, the network entity of the present disclosure may include a transceiver 900, a memory 910, and a processor 920. The network entity may be Figure 1Although the NSSF, NEF, NRF, PCF, UDM, AF, AUSF, AMF, SMF, SCP, (R)AN, UPF, or DN described in the preceding text may be used, for convenience of description, the NSSF, NEF, NRF, PCF, UDM, AF, AUSF, AMF, SMF, SCP, (R)AN, UPF, and DN may be collectively referred to as network entities. In other words, each network entity may include a transceiver 900, a memory 910, and a processor 920. The processor 920, transceiver 900, and memory 910 of the network entity may operate according to the communication method of the network entity described above. However, the components of the network entity are not limited thereto. For example, the network entity may include more or fewer components than those described above. In addition, the processor 920, transceiver 900, and memory 910 may be implemented in the form of a single chip. In addition, the processor 920 may include one or more processors.

[0099] The transceiver 900 is generally referred to as a receiver and transmitter of a network entity, and can transmit and receive signals to and from a base station. The signals transmitted to and received from the base station may include control information and data. In this regard, the transceiver 900 may include an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for amplifying the low noise and down-converting the frequency of the received signal. However, this is merely an example of the transceiver 900, and the components of the transceiver 900 are not limited to an RF transmitter and an RF receiver. In addition, the transceiver 900 can transmit and receive signals to and from other network entities.

[0100] In addition, the transceiver 900 may receive a signal through a radio channel and output a signal to the processor 920 , and transmit a signal output from the processor 920 through a radio channel.

[0101] The memory 910 may store programs and data required for the operation of the network entity. In addition, the memory 910 may store control information or data included in a signal obtained by the network entity. The memory 910 may be a storage medium such as a read-only memory (ROM), a random access memory (RAM), a hard disk, a CD-ROM, a DVD, or a combination of storage media.

[0102] The processor 920 may control a series of processes so that the network entity operates as described above in accordance with the embodiments of the present disclosure. For example, the processor 920 may receive control signals and data signals via the transceiver 900 and process the received control signals and data signals. Furthermore, the processor 920 may transmit the processed control signals and data signals via the transceiver 900.

[0103] The transceiver 900, the memory 910, and the processor 920 may be electrically connected to each other. Furthermore, for example, the processor 920 may be a circuit, a dedicated circuit, or at least one processor. Furthermore, the operation of the network entity may be implemented by providing a memory device storing corresponding program codes of any configuration in the network entity.

[0104] In addition, the network entity may be a base station (RAN), AMF, SMF, UPF, NF, NEF, NRF, CF, NSSF, UDM, AF, AUSF, SCP, UDSF, context storage, OAM, EMS, configuration server, and ID management server. However, the network entity is not limited to the above examples.

[0105] Figure 10 is a diagram showing the configuration of a terminal (UE) according to the present disclosure.

[0106] like Figure 10 As shown, the terminal of the present disclosure may include a transceiver 1000, a processor 1020, a first SIM 1040 and a second SIM 1060. The processor 1020, the transceiver 1000, the first SIM 1040 and the second SIM 1060 of the terminal may operate according to the communication of the above-mentioned terminal. However, the components of the terminal are not limited thereto. For example, the terminal may include more or fewer components than those described above. For example, referring to Figure 10 , only the first SIM 1040 and the second SIM 1060 are shown, but the present disclosure is not limited thereto, and the terminal may further include N SIMs. In addition, the processor 1020 and the transceiver 1000 may be implemented in the form of a single chip. In addition, the processor 1020 may include one or more processors.

[0107] The transceiver 1000 is generally referred to as the receiver and transmitter of the terminal, and can transmit and receive signals to and from the base station. The signals transmitted to and received from the base station may include control information and data. In this regard, the transceiver 1000 may include an RF transmitter for up-converting and amplifying the frequency of the transmitted signal and an RF receiver for amplifying the low noise and down-converting the frequency of the received signal. However, this is merely an example of the transceiver 1000, and the components of the transceiver 1000 are not limited to the RF transmitter and the RF receiver.

[0108] In addition, the transceiver 1000 may receive a signal and output a signal to the processor 1020 through a radio channel, and transmit a signal output from the processor 1020 through a radio channel.

[0109] The processor 1020 may control a series of processes so that the terminal operates as described above in accordance with the embodiments of the present disclosure. For example, the processor 1020 may receive control signals and data signals via the transceiver 1000 and process the received control signals and data signals. Furthermore, the processor 1020 may transmit the processed control signals and data signals via the transceiver 1000.

[0110] The first SIM 1040 and the second SIM 1060 may be access control modules for accessing the network of a mobile network operator. The processor 1020 may perform a registration process on a certain network entity using the first SIM 1040. In addition, the processor 1020 may perform a registration process on a network entity using the second SIM 1060.

[0111] The processor 1020 may use information related to the first SIM 1040 during the registration process for the second SIM 1060, thereby selecting the same NF for the first SIM 1040 and the second SIM 1060. For example, when the registration process for the first SIM 1040 is first performed, the processor 1020 may perform the registration process for the second SIM 1060 based on the identifier assigned to the first SIM 1040.

[0112] In addition, the processor 1020 may store priority information about the first SIM 1040 and the second SIM 1060 based on the subscription information received from the network entity. In addition, the processor 1020 may perform operations of the first SIM 1040 and the second SIM 1060 based on the priority information. For example, the processor 1020 may control data transmission of the first SIM 1040 and paging of the second SIM 1060 based on the priority.

[0113] Figure 11 is a flowchart for describing an operation method of a network entity according to an embodiment of the present disclosure.

[0114] In operation 1110, the network entity may receive a registration request message regarding multiple SIMs from the terminal. According to one embodiment of the present invention, the network entity may be an MME serving as a 4G core network or an AMF serving as a 5G core network. In addition, the network entity may receive a first registration request message regarding a first SIM among the multiple SIMs, and receive a second registration request message regarding a second SIM. In operation 1120, the network entity may perform a process for registering multiple SIMs based on the registration request message. The network entity may perform a process for registering the first SIM based on the first registration request message, and perform a process for registering the second SIM based on the second registration request message. Here, the second registration request message may include identification information regarding the first SIM. The network entity may control the second SIM to register with the network entity to which the first SIM is registered based on the identification information regarding the first SIM.

[0115] At operation 1130, the network entity may determine a priority among the registered multiple SIMs. The network entity may determine the priority among the multiple SIMs based on subscription information about the multiple SIMs received from another network entity (e.g., UDM or HSS). In addition, the network entity may control services based on the determined priority.

[0116] The network entity may transmit a registration accept message including information about the priority to the terminal at operation 1140. The terminal may verify the priority about the plurality of SIMs based on the registration accept message.

[0117] It should be noted that Figures 1 to 11 The configuration diagram, example diagram of the control / data signal transmission method, and example diagram of the operation process and the configuration diagram are not intended to limit the scope of the rights of the present disclosure. That is, Figures 1 to 11 All configurations, entities, or operations described herein should not be construed as essential components for implementing the present invention, and embodiments of the present invention may be implemented within the scope not destroying the essence of the present invention even if only some components are included.

[0118] The methods according to the embodiments described in the claims or the detailed description of the present disclosure may be implemented in hardware, software, or a combination of hardware and software.

[0119] When these methods are implemented in software, a computer-readable recording medium having one or more programs (software modules) recorded thereon may be provided. The one or more programs recorded on the computer-readable recording medium are configured to be executable by one or more processors in an electronic device. The one or more programs include instructions for executing the methods according to the embodiments described in the claims or the detailed description of this disclosure.

[0120] The program (e.g., software module or software) may be stored in random access memory (RAM), non-volatile memory including flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), magneto-optical disk storage, compact disc-ROM (CD-ROM), digital versatile disc (DVD), other types of optical storage devices, or magnetic tape. Alternatively, the program may be stored in a memory that includes a combination of some or all of the above memories. In addition, there may be multiple memories.

[0121] The program may also be stored in an attachable storage device that is accessible via a network, such as the Internet, an intranet, a local area network (LAN), a wide area network (WAN), or a storage area network (SAN), or a combination thereof. The storage device may be connected to an apparatus according to an embodiment of the present disclosure via an external port. Other storage devices on the communication network may also be connected to the apparatus performing the embodiment of the present invention.

[0122] In the above-described embodiments of the present disclosure, the elements included in the present disclosure are expressed in singular or plural form according to the embodiment. However, for ease of explanation, the singular or plural form is appropriately selected and the present disclosure is not limited thereto. Thus, an element expressed in plural form may also be configured as a single element, and an element expressed in singular form may also be configured as multiple elements.

[0123] While specific embodiments have been described in the detailed description of the present disclosure, various modifications may be made without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure should not be limited to the above-described embodiments, but should be determined not only by the scope of the appended claims but also by the equivalents of the claims.

Claims

1. A method performed by a terminal in a wireless communication system, the method comprising: sending a registration request message including information indicating that the terminal is capable of supporting a multiple subscriber identity module (MUSIM) and information associated with a service priority for a currently registered SIM among a plurality of subscriber identity modules (SIMs) to a network entity; as well as receiving a registration accept message from the network entity indicating whether MUSIM is supported in the network entity, wherein the network entity is an Access and Mobility Management Function (AMF) or a Mobility Management Entity (MME), and The information associated with the service priority indicates that an Internet Protocol (IP) Multimedia Subsystem (IMS) voice service takes precedence over other data services.

2. The method of claim 1, further comprising: In case traffic for a second SIM occurs and paging for the second SIM needs to be processed while data on the first SIM is being transmitted or received, a radio resource control (RRC) connection associated with the first SIM is released based on the second SIM having a higher priority than the first SIM.

3. The method of claim 1 , further comprising: receiving information about a service type from said network entity, The service type includes voice service.

4. The method of claim 1 , further comprising: Paging to the SIM contained in the MUSIM is handled based on the priority of the paging.

5. The method according to claim 4, wherein: The processing of the paging includes identifying that paging for IMS services takes precedence over paging for other data services.

6. A terminal in a wireless communication system, the terminal comprising: transceiver; and at least one processor coupled to the transceiver and configured to: sending a registration request message including information indicating that the terminal is capable of supporting a multiple subscriber identity module (MUSIM) and information associated with a service priority for a currently registered SIM among a plurality of subscriber identity modules (SIMs) to a network entity; receiving a registration accept message from the network entity indicating whether MUSIM is supported in the network entity, wherein the network entity is an Access and Mobility Management Function (AMF) or a Mobility Management Entity (MME), and The information associated with the service priority indicates that an Internet Protocol (IP) Multimedia Subsystem (IMS) voice service takes precedence over other data services.

7. The terminal according to claim 6, wherein: The at least one processor is further configured to: In case traffic for a second SIM occurs and paging for the second SIM needs to be processed while data on the first SIM is being transmitted or received, a radio resource control (RRC) connection associated with the first SIM is released based on the second SIM having a higher priority than the first SIM.

8. The terminal according to claim 6, in, The at least one processor is further configured to: receiving information about a service type from said network entity, The service type includes voice service.

9. The terminal according to claim 6, in, The at least one processor is further configured to: Paging of the SIM included in the MUSIM is processed based on the priority of the paging.

10. The terminal according to claim 9, in, The at least one processor is further configured to: Identify that paging for IMS services takes precedence over paging for other data services.

11. A method performed by a network entity in a wireless communication system, the method comprising: receiving, from a terminal, a registration request message including information indicating that the terminal is capable of supporting a multiple subscriber identity module (MUSIM) and information associated with a service priority for a currently registered SIM among a plurality of subscriber identity modules (SIMs); and sending a registration accept message to the terminal indicating whether MUSIM is supported in the network entity, The network entity is an access and mobility management function (AMF) or a mobility management entity (MME), and The information associated with the service priority indicates that an Internet Protocol (IP) Multimedia Subsystem (IMS) voice service takes precedence over other data services.

12. The method of claim 11, wherein: In case traffic for a second SIM occurs and paging for the second SIM needs to be processed while data on the first SIM is being transmitted or received, a radio resource control (RRC) connection associated with the first SIM is released based on a higher priority of the second SIM than the first SIM.

13. The method of claim 11, further comprising: Send information about the service type to the terminal, Among them, the service type includes voice service.

14. The method of claim 11, wherein: Also includes: Paging of SIMs contained in the MUSIM is processed based on the priority of the paging.

15. The method of claim 14, wherein: The processing of the paging includes identifying that paging for IMS services takes precedence over paging for other data services.

16. A network entity in a wireless communication system, the network entity comprising: transceiver; and at least one processor coupled to the transceiver and configured to: receiving, from a terminal, a registration request message including information indicating that the terminal is capable of supporting a multiple subscriber identity module (MUSIM) and information associated with a service priority for a currently registered SIM among a plurality of subscriber identity modules (SIMs), sending a registration accept message to the terminal indicating whether MUSIM is supported in the network entity, The network entity is an access and mobility management function (AMF) or a mobility management entity (MME), and The information associated with the service priority indicates that an Internet Protocol (IP) Multimedia Subsystem (IMS) voice service takes precedence over other data services.

17. The network entity according to claim 16, wherein: In case traffic for a second SIM occurs and paging for the second SIM needs to be processed while data on the first SIM is being transmitted or received, a radio resource control (RRC) connection associated with the first SIM is released based on a higher priority of the second SIM than the first SIM.

18. The network entity according to claim 16, wherein: The at least one processor is further configured to: sending information about the service type to the terminal, The service type includes voice service.

19. The network entity according to claim 16, wherein: The at least one processor is further configured to: Paging of SIMs contained in the MUSIM is handled based on the priority of the paging.

20. The network entity according to claim 19, wherein: The at least one processor is further configured to: Identify that paging for IMS services takes precedence over paging for other data services.

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