Method and device for controlling 5g nsa capability in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates. According to various embodiments of the present disclosure, a method performed by a terminal including a plurality of SIMs in a wireless communication system comprises the steps of: determining whether to activate a dual connectivity function of the terminal on the basis of the type of an SIM used for the current communication service of the terminal; and transmitting, to a base station, information about whether the dual connectivity function is activated, wherein the terminal and the base station are configured to support the dual connectivity function, the plurality of SIMs include a first SIM and a second SIM, and the first SIM and the second SIM include different pieces of subscription information.

Description

Method and device for controlling 5G NSA capabilities in a wireless communication system

[0001] The present disclosure relates generally to wireless communication or mobile communication systems, and more specifically to a method and device for controlling 5G NSA (non-standalone) capability of a terminal in a wireless communication or mobile communication system.

[0002] To meet the growing demand for wireless data traffic following the commercialization of 4G (4th generation) communication systems, efforts are being made to develop improved 5G (5th generation) communication systems, or pre-5G communication systems. For this reason, 5G communication systems, or pre-5G communication systems, are also referred to as "Beyond 4G Network" communication systems or "Post-LTE" systems.

[0003] To achieve high data rates, 5G communication systems are being considered for implementation in ultra-high frequency (mmWave) bands (e.g., the 60 GHz band). To mitigate radio path loss and increase transmission range in ultra-high frequency bands, beamforming, massive MIMO (massive MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and large-scale antenna technologies are being discussed in 5G communication systems.

[0004] Additionally, to improve the network of the system, technologies such as evolved small cells, advanced small cells, cloud radio access networks (cloud RAN), ultra-dense networks, device-to-device communication (D2D), wireless backhaul, moving networks, cooperative communication, CoMP (Coordinated Multi-Points), and interference cancellation are being developed in 5G communication systems.

[0005] In addition, 5G systems are developing advanced coding modulation (ACM) techniques such as Hybrid Frequency Shift Keying and Quadrature Amplitude Modulation (FQAM) and Sliding Window Superposition Coding (SWSC), as well as advanced access technologies such as Filter Bank Multi Carrier (FBMC), Non Orthogonal Multiple Access (NOMA), and Sparse Code Multiple Access (SCMA). As a result of the aforementioned advancements in wireless communication systems, a variety of services have become available, and methods for seamlessly delivering these services are becoming increasingly necessary.

[0006] To meet the demand for wireless data traffic, 5G systems, NR (new radio or next radio), have been commercialized. Like 4G, 5G systems can provide users with high data rates, and it is expected that various wireless communication services will be provided, such as the Internet of Things and services requiring high reliability for specific purposes. In the current mixed system of 4th generation and 5th generation communication systems, the O-RAN (Open Radio Access Network), established by operators and equipment providers, is defining new NE (network element) and interface specifications based on the existing 3GPP specifications and proposing the O-RAN architecture.

[0007] Recent devices can support dual connectivity, connecting not only to existing 4G networks but also to 5G (or NR) networks. Dual connectivity allows devices to provide complementary communication services alongside existing 4G networks when 5G alone is not sufficient.

[0008] However, if a terminal connects to a 5G network even when it doesn't need to receive services from the network (e.g., 5G mobile communications), battery drain may occur as the terminal performs the connection process to the 5G network. Therefore, technology may be needed to control the terminal to remain connected only to the existing 4G network when it doesn't need to connect to the 5G network.

[0009] Based on the discussion described above, the present disclosure provides a device and method for saving battery by controlling dual connection of a terminal in a wireless communication system (or mobile communication system).

[0010] More specifically, the present disclosure can disable dual connectivity of a terminal connected to a 4G network in a wireless communication system when the terminal does not need to connect to a 5G network. In particular, in a 5G NSA (non-standalone) communication system, a method is provided for controlling ENDC (Evolved Universal Mobile Telecommunications System (UMTS) terrestrial radio access (E-UTRA) - New Radio (NR) dual connectivity) of a terminal when the terminal does not need to receive services from a 5G network.

[0011] According to various embodiments of the present disclosure, a method of a terminal including a plurality of subscriber identification modules (SIMs) in a wireless communication system includes an operation of determining whether to activate a dual connectivity function of the terminal based on a type of SIM used for a current communication service of the terminal, and an operation of transmitting information regarding whether to activate the dual connectivity function to a base station, wherein the terminal and the base station support the dual connectivity function, the plurality of SIMs include a first SIM and a second SIM, and the first SIM and the second SIM include different subscription information.

[0012] According to various embodiments of the present disclosure, a terminal including a plurality of subscriber identification modules (SIMs) in a wireless communication system includes a transceiver, a first SIM, a second SIM, and at least one processor coupled with the transceiver, the first SIM, and the second SIM, wherein the at least one processor determines whether to activate a dual connectivity function of the terminal based on a type of SIM used for a current communication service of the terminal, and transmits information regarding whether to activate the dual connectivity function to a base station, wherein the terminal and the base station support the dual connectivity function, the plurality of SIMs include the first SIM and the second SIM, and the first SIM and the second SIM include different subscription information.

[0013] According to various embodiments of the present disclosure, devices and methods can disable dual connectivity of a terminal when the terminal does not need to receive services from a 5G network. Furthermore, when dual connectivity is disabled, the terminal may not receive configuration information for connecting to the 5G network from the 5G network. Therefore, the terminal can reduce power consumption by not performing the connection procedure to the 5G network. Furthermore, the overhead of signaling required for connecting to the 5G network can be reduced.

[0014] The effects that can be obtained from the present disclosure are not limited to the effects mentioned above, and other effects that are not mentioned can be clearly understood by a person having ordinary skill in the art to which the present disclosure belongs from the description below.

[0015] FIG. 1 illustrates a wireless communication system according to various embodiments of the present disclosure.

[0016] FIG. 2 illustrates a configuration of a base station in a wireless communication system according to various embodiments of the present disclosure.

[0017] FIG. 3 illustrates a configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure.

[0018] FIG. 4 illustrates the structure of a 5G non-standalone (NSA) in relation to various embodiments of the present disclosure.

[0019] FIG. 5 illustrates a connection procedure to a 5G network in connection with various embodiments of the present disclosure.

[0020] FIG. 6 illustrates an operation sequence between a terminal and a base station according to various embodiments of the present disclosure.

[0021] FIG. 7 illustrates a procedure for controlling EN-DC of a terminal according to various embodiments of the present disclosure.

[0022] FIG. 8 illustrates a procedure for controlling EN-DC of a terminal according to various embodiments of the present disclosure.

[0023] FIG. 9 illustrates an example of a database according to various embodiments of the present disclosure.

[0024] FIG. 10 illustrates an update procedure of an EN-DC state of a terminal according to various embodiments of the present disclosure.

[0025] FIG. 11 illustrates a procedure for controlling EN-DC of a terminal according to various embodiments of the present disclosure.

[0026] FIG. 12 illustrates an operation sequence between a terminal and a base station according to various embodiments of the present disclosure.

[0027] FIG. 13 illustrates a procedure for controlling EN-DC of a terminal according to various embodiments of the present disclosure.

[0028] FIG. 14 illustrates an operation sequence between a terminal and a base station according to various embodiments of the present disclosure.

[0029] FIG. 15 illustrates the operation of a terminal according to various embodiments of the present disclosure.

[0030] The terms used in this disclosure are used only to describe specific embodiments and may not be intended to limit the scope of other embodiments. The singular expression may include plural expressions unless the context clearly indicates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by those of ordinary skill in the art described in this disclosure. Terms defined in general dictionaries among the terms used in this disclosure may be interpreted as having the same or similar meaning in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined in this disclosure. In some cases, even if a term is defined in this disclosure, it cannot be interpreted to exclude embodiments of the present disclosure.

[0031] The various embodiments of the present disclosure described below illustrate a hardware-based approach as an example. However, since the various embodiments of the present disclosure include techniques utilizing both hardware and software, the various embodiments of the present disclosure do not exclude a software-based approach.

[0032] In the following description, terms referring to signals (e.g., message, information, preamble, signal, signaling, sequence, stream), terms referring to resources (e.g., symbol, slot, subframe, radio frame, subcarrier, resource element (RE), resource block (RB), bandwidth part (BWP), occasion), terms for operational states (e.g., step, operation, procedure), terms referring to data (e.g., information, bit, symbol, codeword), terms referring to channels, terms referring to control information (e.g., downlink control information (DCI), medium access control control element (MAC CE), radio resource control (RRC) signaling), terms referring to network entities, terms referring to components of devices, etc. are examples for convenience of explanation. Therefore, the present disclosure is not limited to the terms described below, and other terms having equivalent or similar technical meanings may be used.

[0033] In the following description, the terms "physical channel" and "signal" may be used interchangeably with data or control signals. For example, while PDSCH (physical downlink shared channel) refers to a physical channel through which data is transmitted, PDSCH can also be used to refer to data. That is, in the present disclosure, the expression "transmitting a physical channel" can be interpreted equivalently to the expression "transmitting data or a signal through a physical channel."

[0034] Hereinafter, in the present disclosure, upper signaling refers to a signal transmission method in which a base station transmits a signal to a terminal using a downlink data channel of the physical layer, or a terminal transmits a signal to a base station using an uplink data channel of the physical layer. Upper signaling can be understood as RRC (radio resource control) signaling or a MAC control element (hereinafter referred to as 'CE').

[0035] Additionally, in the present disclosure, expressions such as "more than" and "less than" are used to determine whether a specific condition is satisfied or fulfilled. However, this is merely a description to express an example and does not exclude descriptions of more than or less than. Conditions described as "more than" may be replaced with "more than," conditions described as "less than" may be replaced with "less than," and conditions described as "more than and less than" may be replaced with "more than and less than."

[0036] Additionally, while this disclosure describes various embodiments using terminology used in various communication standards (e.g., 3rd Generation Partnership Project (3GPP)), these are merely illustrative examples. The various embodiments of this disclosure can be easily modified and applied to other communication systems.

[0037] Meanwhile, in a wireless communication system, a UICC (Universal Integrated Circuit Card) is a smart card inserted into a mobile communication terminal, etc., and the UICC may include an access control module for connecting to a mobile communication operator's network. According to various embodiments, examples of the access control module include a USIM (Universal Subscriber Identity Module), a SIM (Subscriber Identity Module), an ISIM (IP Multimedia Service Identity Module), etc., but are not limited to the above examples. The UICC is also called a UICC card, a USIM card, a SIM card, and can be commonly referred to as a SIM card. The UICC can store the personal information of a mobile communication subscriber, and performs subscriber authentication and traffic security key generation when connecting to a mobile communication network, thereby enabling secure mobile communication use.

[0038] With the proliferation of the Internet of Things (IoT), embedded UICCs (eUICCs) are being applied to various devices, such as wearable devices, automobiles, and smart meters. An eUICC can refer to a UICC card that allows users to download and select SIM modules. Specifically, an eUICC can include UICC cards that can be remotely downloaded and selected, either fixed to a terminal or not.

[0039] In the following specification, the term "SIM card" or "SIM" may be used to mean a UICC card, a USIM card, a UICC including an ISIM, etc. In other words, the technical application for the SIM card may be equally applied to a USIM card, an ISIM card, or a general UICC card. According to various embodiments, the SIM card may store the personal information of a mobile communication subscriber, and perform subscriber authentication and traffic security key generation when connecting to a mobile communication network, thereby enabling secure mobile communication use. In addition, according to various embodiments, the SIM card may be manufactured as a dedicated card for a specific mobile communication service provider upon request of the SIM card manufacturer, and authentication information for connecting to the network of the relevant service provider, such as a USIM (Universal Subscriber Identity Module) application and an IMSI (International Mobile Subscriber Identity), a K (Subscriber Key) value, an OPc (Operator Constant) value, etc., may be pre-loaded on the SIM card before shipment.

[0040] Subscribers can use the network and application services of mobile communication service providers by inserting a UICC card into their mobile terminals, and when replacing their terminals, they can use the authentication information, mobile phone number, personal phone book, etc. stored in the UICC card in the new terminal by moving and inserting the UICC card from the old terminal to the new terminal. According to various embodiments, when a SIM module is remotely downloaded and installed in the UICC card, the user can download the SIM module of the mobile communication service he or she wants to use to the UICC card at the desired time. Furthermore, according to various embodiments, the UICC card can download and install multiple SIM modules and select and use only one of them. The UICC card may or may not be fixed to the terminal. In particular, a UICC fixed to the terminal is called an eUICC (embedded UICC).

[0041] Among the UICC cards that can remotely download and select a SIM module, all UICC cards that are fixed or not fixed to the terminal can be referred to as eUICC, and the SIM module that is remotely downloaded can be expressed as eSIM. In addition, the downloaded SIM module information can be referred to as an eUICC profile or eSIM Profile, Profile, Profile. In addition, in the following specification, the communication service provider network operator can be used with the same meaning as service provider, communication service provider, mobile communication service provider, and mobile carrier. For the convenience of explanation, in the case of eUICC, the terms and names defined in the GSMA standards are used. However, the present disclosure is not limited by the above terms and names, and can be equally applied to systems that follow other standards.

[0042] The present disclosure relates to a method and device for supporting various services in a wireless communication system. Specifically, the present disclosure describes a technique for controlling the dual connectivity (DC) function of a terminal according to the type of subscription information when a single terminal has multiple subscription information in a wireless communication system. A single terminal having multiple subscription information can be implemented by having two or more Subscription Identity Modules (SIMs) storing subscription information. Each SIM can be stored in a physical card form (e.g., a UICC), implemented in software form, or a combination of the two methods. Hereinafter, in describing embodiments of the present disclosure, the terms subscription information and SIM may be used interchangeably. Furthermore, a terminal including two SIMs, each storing two types of subscription information, may be referred to as a terminal supporting dual SIMs.

[0043] The present disclosure may be described below based on a terminal supporting dual SIMs (e.g., a terminal including two different types of SIMs). Of course, the following embodiments are not limited to terminals supporting dual SIMs, and may also be applied to terminals including three or more SIMs, each storing subscription information.

[0044] FIG. 1 illustrates a wireless communication system according to various embodiments of the present disclosure. FIG. 1 illustrates a base station (110), a terminal (120), and a terminal (130) as some of the nodes utilizing a wireless channel in the wireless communication system. While FIG. 1 illustrates only one base station, other base stations identical to or similar to the base station (110) may be included. Furthermore, in embodiments of the present disclosure, the base station (110) may refer to at least one of an LTE base station and a 5G base station.

[0045] The base station (110) is a network infrastructure that provides wireless access to terminals (120, 130). The base station (110) has coverage defined as a certain geographical area based on the distance at which a signal can be transmitted. In addition to the base station, the base station (110) includes an 'access point (AP)', an 'eNodeB (eNB)', and a '5G node (5 th It may be referred to as 'next generation node (gNB)', 'wireless point', 'transmission / reception point (TRP)' or other terms having equivalent technical meaning.

[0046] Each of the terminal (120) and the terminal (130) is a device used by a user and communicates with the base station (110) via a wireless channel. The link from the base station (110) to the terminal (120) or the terminal (130) is referred to as a downlink (DL), and the link from the terminal (120) or the terminal (130) to the base station (110) is referred to as an uplink (UL). In addition, although not shown in FIG. 1, according to one embodiment, the terminal (120) and the terminal (130) may communicate with each other via a wireless channel. In this case, the link (device-to-device link; D2D) between the terminals (120 and 130) is referred to as a sidelink, and the sidelink may be used interchangeably with the PC5 interface. In some cases, at least one of the terminals (120) and the terminals (130) may be operated without the intervention of the user. That is, at least one of the terminal (120) and the terminal (130) is a device that performs machine type communication (MTC) and may not be carried by the user. Each of the terminal (120) and the terminal (130) may be referred to as a 'user equipment (UE)', a 'mobile station', a 'subscriber station', a 'remote terminal', a 'wireless terminal', a 'user device', or other terms having an equivalent technical meaning.

[0047] The base station (110), the terminal (120), and the terminal (130) can transmit and receive wireless signals in the millimeter wave (mmWave) band (e.g., 28 GHz, 30 GHz, 38 GHz, 60 GHz). At this time, in order to improve channel gain, the base station (110), the terminal (120), and the terminal (130) can perform beamforming. Here, the beamforming can include transmission beamforming and reception beamforming. That is, the base station (110), the terminal (120), and the terminal (130) can provide directionality to a transmission signal or a reception signal. To this end, the base station (110) and the terminals (120, 130) can select serving beams (121, 131) through a beam search or beam management procedure. After serving beams (121, 131) are selected, subsequent communication can be performed through resources that are in a QCL (quasi co-located) relationship with the resources that transmitted the serving beams (121, 131).

[0048] If large-scale characteristics of a channel carrying a symbol on a first antenna port can be inferred from a channel carrying a symbol on a second antenna port, the first antenna port and the second antenna port can be evaluated to have a QCL relationship. For example, the large-scale characteristics may include at least one of delay spread, Doppler spread, Doppler shift, average gain, average delay, and a spatial receiver parameter.

[0049] FIG. 2 illustrates the configuration of a base station in a wireless communication system according to various embodiments of the present disclosure. The configuration illustrated in FIG. 2 can be understood as the configuration of a base station (110). Terms such as "unit" and "unit" used hereinafter refer to a unit that processes at least one function or operation, and this can be implemented by hardware, software, or a combination of hardware and software. Referring to FIG. 2, the base station includes a wireless communication unit (210), a backhaul communication unit (220), a storage unit (230), and a control unit (240).

[0050] The wireless communication unit (210) performs functions for transmitting and receiving signals via a wireless channel. For example, the wireless communication unit (210) performs a conversion function between baseband signals and bit streams according to the physical layer specifications of the system. For example, when transmitting data, the wireless communication unit (210) encodes and modulates the transmitted bit stream to generate complex symbols. Additionally, when receiving data, the wireless communication unit (210) restores the received bit stream by demodulating and decoding the baseband signal.

[0051] In addition, the wireless communication unit (210) upconverts a baseband signal into an RF (radio frequency) band signal and transmits it through an antenna, and downconverts an RF band signal received through the antenna into a baseband signal. To this end, the wireless communication unit (210) may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital to analog convertor (DAC), an analog to digital convertor (ADC), etc. In addition, the wireless communication unit (210) may include a plurality of transmission and reception paths. Furthermore, the wireless communication unit (210) may include at least one antenna array composed of a plurality of antenna elements.

[0052] In terms of hardware, the wireless communication unit (210) may be composed of a digital unit and an analog unit, and the analog unit may be composed of a plurality of sub-units depending on operating power, operating frequency, etc. The digital unit may be implemented with at least one processor (e.g., a digital signal processor (DSP)).

[0053] The wireless communication unit (210) transmits and receives signals as described above. Accordingly, all or part of the wireless communication unit (210) may be referred to as a "transmitter," a "receiver," or a "transceiver." Furthermore, in the following description, transmission and reception performed via a wireless channel are used to mean that the wireless communication unit (210) performs the processing described above.

[0054] The backhaul communication unit (220) provides an interface for performing communication with other nodes within the network. That is, the backhaul communication unit (220) converts a bit string transmitted from a base station to another node, such as another access node, another base station, an upper node, a core network, etc., into a physical signal, and converts a physical signal received from another node into a bit string.

[0055] The storage unit (230) stores data such as basic programs, application programs, and setting information for the operation of the base station. The storage unit (230) may be composed of volatile memory, non-volatile memory, or a combination of volatile and non-volatile memory. In addition, the storage unit (230) provides stored data upon request from the control unit (240).

[0056] The control unit (240) controls the overall operations of the base station. For example, the control unit (240) transmits and receives signals through the wireless communication unit (210) or the backhaul communication unit (220). In addition, the control unit (240) records and reads data in the storage unit (230). In addition, the control unit (240) can perform functions of a protocol stack required by the communication standard. According to another implementation example, the protocol stack can be included in the wireless communication unit (210). For this purpose, the control unit (240) can include at least one processor. According to various embodiments of the present disclosure, the control unit (240) can control the base station to perform operations according to various embodiments described below. For example, the control unit (240) can control the terminal to provide configuration information for a measurement report of the terminal so that the terminal supporting the dual connectivity function can perform a connection procedure with a 5G base station. In addition, the control unit (240) may control the terminal to provide the terminal with setting information for connecting to the base station based on the measurement report received from the terminal. In addition, the processor may include various processing circuits and / or multiple processors. For example, as used herein, including in the claims, the term "processor" may include various processing circuits including at least one processor, wherein one or more of the at least one processor may be configured to perform the various functions described herein in an individually and / or collectively distributed manner. When "processor," "at least one processor," and "one or more processors" are described herein as being configured to perform multiple functions, these terms include, but are not limited to, situations where one processor performs some of the recited functions and other processors perform other of the recited functions, and situations where a single processor can perform all of the recited functions.Additionally, at least one processor may comprise a combination of processors that perform various cited / disclosed functions, for example, in a distributed manner. At least one processor may execute program instructions to achieve or perform various functions.

[0057] FIG. 3 illustrates a configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure. The configuration illustrated in FIG. 3 can be understood as a configuration of a terminal (120). Terms such as "unit" and "unit" used hereinafter refer to a unit that processes at least one function or operation, which may be implemented by hardware, software, or a combination of hardware and software. Referring to FIG. 3, the terminal (120) may include a transceiver (310), a memory (320), a processor (330), a first SIM (331), and a second SIM (332). The transceiver (310), the memory (320), the processor (330), the first SIM (331), and the second SIM (332) of the terminal (120) may operate according to the communication method of the terminal described below. However, the components of the terminal (120) are not limited to the above-described examples. For example, the terminal (120) may include more or fewer components than the aforementioned components. For example, referring to FIG. 3, only the first SIM (331) and the second SIM (332) are disclosed, but this is not limited thereto, and it is understood that N more SIMs (not shown) may be included. In addition, the processor (330), the transceiver (310), and the memory (320) may be implemented in the form of a single chip.

[0058] The transceiver (310) is a general term for the receiver and transmitter of the terminal, and can transmit and receive signals with the base station. The signals transmitted and received with the base station may include control information and data. To this end, the transceiver (310) may be configured with an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and frequency-converts the received signal. However, this is only one embodiment of the transceiver (310), and the components of the transceiver (310) are not limited to the RF transmitter and RF receiver.

[0059] In addition, the transceiver (310) can receive a signal through a wireless channel and output it to the processor (330), and transmit the signal output from the processor (330) through the wireless channel.

[0060] The memory (320) can store programs and data required for the operation of the terminal (120). In addition, the memory (320) can store control information or data included in a signal obtained from the terminal (120). The memory (320) can be configured as a storage medium or a combination of storage media, such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD.

[0061] The processor (330) may control a series of processes so that the terminal (120) can operate according to the embodiments of the present disclosure described above. The processor (330) may include at least one processor. For example, the processor (330) may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as application programs. The processor (330) may include various processing circuits and / or multiple processors. For example, as used herein, including in the claims, the term "processor" may include various processing circuits including at least one processor, wherein one or more of the at least one processor may be configured to perform various functions described herein in an individually and / or collectively distributed manner. When "processor," "at least one processor," and "one or more processors" are described herein as being configured to perform multiple functions, these terms include, but are not limited to, situations where one processor performs some of the recited functions and another processor performs other of the recited functions, and situations where a single processor can perform all of the recited functions. Furthermore, the at least one processor may comprise a combination of processors that perform various recited / disclosed functions, for example, in a distributed manner. At least one processor may execute program instructions to achieve or perform various functions.

[0062] The first SIM (331) and the second SIM (332) may be access control modules for connecting to a mobile communication service provider's network. The processor (330) may perform a registration process with a predetermined network entity using the first SIM (331). In addition, the processor (330) may also perform a registration process with the network entity using the second SIM (332).

[0063] FIG. 4 illustrates the structure of a 5G non-standalone (NSA) in relation to various embodiments of the present disclosure.

[0064] Referring to FIG. 4, a 5G NSA network structure related to a terminal providing dual connectivity functionality is described. Specifically, in the present disclosure, a terminal may refer to a terminal providing a 5G NSA function that can be connected to not only a 4G network but also a 5G network. In this case, the dual connectivity technology may be a technology in which an LTE base station can perform control processing for the terminal as a master base station, and the terminal can improve the transmission speed through the 5G base station. In addition, it may be a technology in which an LTE base station and a 5G base station are connected to a core network (e.g., evolved packet core, EPC) of a 4G network. In other words, when a single terminal in a mobile communication network is simultaneously connected to an LTE and a 5G base station and transmits and receives data with each base station simultaneously, the LTE base station becomes a master base station and processes control, and the 5G base station only improves the data transmission speed, and the two base stations are connected only to the EPC, which is an LTE core network, without using the 5G core network (5GC).

[0065] In dual connectivity, the base station providing macrocell coverage becomes the master base station (e.g., eNB) and can handle both the control plane and the user plane. Other base stations with small cell coverage (e.g., eNB or gNB) are called secondary base stations and can perform an auxiliary role, handling only the user plane. In other words, the master base station processes control signaling, and the secondary base station can be used to improve data transmission speeds. In 5G communication systems, the use of both low-frequency bands (410 MHz to 7125 MHz) and high-frequency bands (24.25 GHz to 52.6 GHz) greatly diversifies the coverage of base stations, making services that combine the strengths and weaknesses of both macrocells and small cells very important. Additionally, dual connectivity (e.g., multi-radio dual connectivity, MR-DC) technology based on two different radio resources can play an important role when using NR, the radio access technology of 5G, and E-UTRA, the radio access technology of LTE.

[0066] E-UTRA-NR dual connectivity (hereinafter, EN-DC or ENDC) may be one of the types of multi-radio dual connectivity (MR-DC). In EN-DC, both the LTE base station providing E-UTRA and the 5G base station are connected to the LTE core network, EPC, and the 5GC may not be used. The control plane may be processed by the LTE base station, and the user plane may be processed by the LTE base station and the 5G base station. In particular, EN-DC may be a technology used in the 5G NSA network architecture. Hereinafter, in the embodiments of the present disclosure, a 5G base station may refer to a 5G NSA base station that supports EN-DC. That is, in the present disclosure, a 5G base station, a 5G NSA base station, or a 5G NSA cell may be used with the same meaning.

[0067] Hereinafter, embodiments of the present disclosure may be described based on dual connectivity (e.g., EN-DC) used in a 5G NSA network architecture. Of course, the communication network architecture and dual connectivity method in the embodiments of the present disclosure are not limited to the examples described above.

[0068] FIG. 5 illustrates a connection procedure to a 5G network in connection with various embodiments of the present disclosure.

[0069] Referring to Figure 5, the measurement reporting and connection procedures between a terminal and a base station (e.g., gNB) can be described. The terminal can establish an RRC (radio resource control) connection with the base station. Additionally, the terminal can be in RRC connected mode (RRC_CONNECTED).

[0070] In step 510, the base station may transmit a predetermined RRC message (e.g., RRCResume or RRCReconfiguration) containing measurement configuration information to the terminal. In one embodiment, the measurement configuration information may include report configuration information containing event triggering conditions (e.g., EventA3, EventA4, EventA5, EventB1, or EventB2) for triggering a measurement report from the terminal. In addition, the measurement configuration information may include information regarding a measurement gap for the terminal to measure neighboring cells.

[0071] In step 520, the terminal may perform measurements on neighboring cells (e.g., 5G NSA cells) based on measurement configuration information received from the base station. For example, the terminal may measure the signal quality of neighboring cells (e.g., reference signal received power (RSRP) and reference signal received quality (RSRQ)).

[0072] In step 530, the terminal may transmit a measurement report including measurement results for neighboring cells to the base station. At this time, the measurement report may be triggered by an event triggering condition included in the measurement configuration information of step 510. For example, the terminal may report the measurement result when a specific event occurs. At this time, the target cell for each event may be predetermined. For example, the event may target each of the serving cell, neighboring cells, primary cells, and secondary cells, or a combination thereof. The measurement report may include at least one of the signal quality (e.g., RSRP, RSRQ) of the neighboring cells measured by the terminal in step 520 and the identifiers of the neighboring cells.

[0073] At step 540, the base station may transmit configuration information to the terminal for connecting to a 5G base station (e.g., a 5G SCG (secondary cell group)) based on the measurement report received from the terminal.

[0074] At step 550, the terminal can perform a camp-on procedure to a 5G base station based on the configuration information received at step 540.

[0075] The operations of the terminal and base station described above are merely examples. Some of the operations described above may be omitted, or more may be combined. Furthermore, at least one new operation, in addition to the operations described above, may be added and organically combined with existing operations.

[0076] Hereinafter, in the embodiments of the present disclosure, the terminal may be described as a terminal that supports EN-DC and dual SIM. Of course, the present disclosure is not limited to the above examples.

[0077] In one embodiment, a terminal supporting dual SIM may include a default data SIM (DDS) stack (hereinafter, DDS) and a non-DDS stack (hereinafter, non-DDS). For example, a first SIM (331) of the terminal may be a DDS, and a second SIM (332) may be a non-DDS. In this case, the stack may refer to a meaning identical to or similar to that of a SIM. Therefore, in the following disclosure, DDS (including non-DDS) may be used with the same meaning as a DDS stack or a default data stack. However, in the terminal, the DDS and the non-DDS may share one wireless transceiver (e.g., the communication unit (310)). Therefore, the wireless transceiver may only perform the tasks of one SIM at a time. A DDS can be identified through user input, etc., and can be a SIM that supports (mobile) data (e.g., mobile data provided by a 5G base station), voice calls (e.g., voice over LTE, VoLTE or voice over new radio, VoNR), and short message service (SMS). Hereinafter, in the embodiments of the present disclosure, mobile data may refer to wireless communication or mobile communication data serviced through a 5G base station. A non-DDS can be a SIM that supports voice calls and SMS. However, unlike a DDS, a non-DDS cannot support transmission and / or reception of mobile data. Therefore, the first SIM (331) of the terminal can be used for transmission and / or reception of mobile data, but the second SIM (332) may have difficulty being used for transmission and / or reception of mobile data. Of course, the description of the terminal described above is only one example and is not limited to the above description.

[0078] FIG. 6 illustrates an operation sequence between a terminal and a base station according to various embodiments of the present disclosure.

[0079] Referring to FIG. 6, a procedure for a terminal supporting EN-DC to connect to a 5G base station is illustrated, regardless of whether the terminal uses mobile data.

[0080] At step 610, the DDS of the terminal can transmit and / or receive mobile data with the base station. At this time, the non-DDS of the terminal may have difficulty transmitting and / or receiving mobile data with the base station. For example, if the terminal wishes to transmit and / or receive mobile data with the base station, the terminal may utilize the DDS. Accordingly, if the SIM currently being used by the terminal for communication services is non-DDS, the terminal may need to convert (or switch) the currently used SIM to a DDS to transmit and / or receive mobile data.

[0081] At step 620, the terminal can identify the SIM currently being used for the communication service. For example, if the SIM currently being used for the communication service of the terminal is a DDS, the terminal can transmit and / or receive mobile data via DDS, as in step 610. However, if the SIM currently being used for the communication service of the terminal is a non-DDS, the terminal cannot transmit and / or receive mobile data via non-DDS. Therefore, if the SIM currently being used for the communication service is identified as a non-DDS, the terminal may be connected to a 4G base station. Therefore, the terminal may not be able to use mobile data. Therefore, the terminal may need to perform a connection procedure to a 5G base station to use mobile data.

[0082] In step 630, the base station may transmit measurement configuration information to the terminal for measurement reporting on the terminal's 5G cell. For example, if the terminal is currently unable to use mobile data, the base station may transmit measurement configuration information to the terminal for connection (e.g., EN-DC).

[0083] At step 640, the terminal may perform measurements on neighboring cells (e.g., 5G cells) based on measurement configuration information received from the base station. For example, the terminal may measure the signal quality of neighboring cells (e.g., reference signal received power (RSRP) and reference signal received quality (RSRQ)).

[0084] In step 650, the terminal may transmit a measurement report including measurement results for neighboring cells to the base station. At this time, the measurement report may be triggered by an event triggering condition included in the measurement configuration information of step 630. For example, the terminal may report the measurement results when a specific event occurs. Each event may predetermine which cell it targets. The measurement report may include the signal quality (e.g., RSRP, RSRQ) of the neighboring cells measured by the terminal in step 640, as well as the identifiers of the neighboring cells.

[0085] At step 660, the base station may transmit configuration information to the terminal for connecting to a 5G base station (e.g., 5G SCG) based on the measurement report received from the terminal.

[0086] In step 670, the terminal may perform a connection (camp-on) procedure to a 5G base station based on the configuration information received in step 660. The connection procedure to a 5G base station of FIG. 6 (e.g., steps 630 to 670) may include the same or similar operations as the operations of FIG. 5 described above (e.g., steps 510 to 550).

[0087] The operations of the terminal and base station described above are merely examples. Some of the operations described above may be omitted, or more may be combined. Furthermore, at least one new operation, in addition to the operations described above, may be added and organically combined with existing operations.

[0088] FIG. 7 illustrates a procedure for controlling EN-DC of a terminal according to various embodiments of the present disclosure.

[0089] Referring to FIG. 7, a method for controlling the EN-DC feature (or capability) of a terminal so as not to perform a connection procedure to a 5G base station when the terminal does not use mobile data can be described.

[0090] At step 710, the terminal may create and maintain a database regarding network operators. For example, the terminal may receive information regarding network operators (e.g., telecommunications carriers) from a base station. The terminal may store the information regarding network operators received from the base station and create a database based on the stored information. Furthermore, the terminal may periodically or dynamically manage and maintain the created database based on the terminal's movement and status (e.g., power on / off). In this case, the network operator may be a base station operator that controls cells supporting EN-DC.

[0091] At step 720, the terminal can identify (or determine) a changed mobile status. For example, the change in the mobile status of the terminal may be at least one of: the terminal's mobile data usage being turned on or off, the DDS being changed, or the terminal being powered on or restarted. In this case, the change in the DDS may be an action of the user (or the terminal) changing the DDS settings for using the Internet connection, such as switching to a different SIM. For example, if the terminal uses mobile data on the first SIM, the user may change the DDS settings to the second SIM. Thereafter, all Internet data may be transmitted through the second SIM, and data rates may be charged for the second SIM.

[0092] At step 730, the terminal can identify (or determine) whether a specific network operator supports EN-DC based on the database generated at step 710. For example, the terminal can identify whether it can connect to any one network (e.g., a 5G base station) included in the database based on information about at least one network operator that supports EN-DC. At this time, if the database identifies a specific network operator as not supporting EN-DC, the terminal may not perform the EN-DC control method according to the present disclosure.

[0093] At step 740, if a specific network operator is identified as supporting EN-DC based on the database, the terminal may deactivate the EN-DC in the "non-using mobile data" state in the non-DDS. Here, "non-using mobile data" refers to a case where the terminal cannot use mobile data, and "non-using mobile data" may cause the deactivation of an active SIM. In addition, deactivation of one SIM (e.g., DDS or non-DDS) of the terminal may also refer to an operation of changing / switching to another SIM (e.g., non-DDS or DDS) or using only the other SIM (e.g., non-DDS or DDS). For example, the terminal may deactivate the EN-DC of the terminal if the SIM currently used for the communication service is non-DDS and does not use mobile data. Accordingly, the terminal may not receive measurement configuration information for performing measurement reporting for a 5G cell from the base station. Alternatively, even if the terminal receives measurement configuration information for performing measurement reporting for a 5G cell from the base station, the terminal may not perform subsequent procedures for connecting to the 5G base station (e.g., at least one of steps 520 to 550 of FIG. 5).

[0094] At step 750, the terminal can activate EN-DC in the DDS. For example, if the SIM currently used for the terminal's communication service is DDS, the terminal can use mobile data and thus activate the EN-DC, which is currently in a disabled state. In this case, the EN-DC being in a disabled state may mean that the DDS is disabled due to "mobile data not being used." However, if the EN-DC of the terminal is activated, the terminal can skip step 750.

[0095] In step 760, the terminal may update the base station with the status of the EN-DC function (or capability) of the terminal that has been changed through step 740 or step 750. For example, if the EN-DC of the terminal is deactivated through step 740 or the EN-DC status of the terminal is activated through step 750, the terminal may transmit information about the changed EN-DC status to the base station. In one embodiment, the information about the status of the EN-DC function of the terminal may be included in the UE Capability Information that the terminal transmits to the base station in response to the base station's request for terminal capability information (e.g., UE Capability Enquiry). Accordingly, the base station may determine whether or not to perform procedures for the terminal to connect to the 5G base station based on the changed EN-DC status of the terminal. For example, if the EN-DC of the terminal is deactivated through step 740, the base station may identify (determine or determine) that the terminal does not need to connect to the 5G base station and may not transmit measurement configuration information for the terminal's measurement report to the terminal. Alternatively, if EN-DC of the terminal is activated through step 750, the base station may identify (judge or determine) that the terminal needs to connect to a 5G base station, and transmit measurement configuration information for the terminal's measurement report to the terminal.

[0096] The operations of the terminal and base station described above are merely examples. Some of the operations described above may be omitted, or more may be combined. Furthermore, at least one new operation, in addition to the operations described above, may be added and organically combined with existing operations.

[0097] FIG. 8 illustrates a procedure for controlling EN-DC of a terminal according to various embodiments of the present disclosure.

[0098] Referring to FIG. 8, the operating sequence of the terminal according to the embodiment of FIG. 7 described above can be specifically described according to the change in mobile data and the type of SIM used for the terminal's current communication service. However, descriptions of content that overlaps with the content described in FIG. 7 and FIG. 8 described above may be omitted.

[0099] In step 810, the terminal may create and maintain a database of network operators. For example, the terminal may receive information about network operators (e.g., telecommunications carriers) from a base station. The information received from the base station may include at least information regarding whether EN-DC is supported by each network operator. The terminal may store the information about network operators received from the base station in its memory (or buffer) and create a database based on the stored information. For example, the terminal may periodically or dynamically receive information about new network operators. The information about new network operators may include information about network operators in surrounding cells at a new location as the terminal moves. Accordingly, the terminal may update the stored information about existing network operators based on the information about new network operators. Of course, the above-described database creation and maintenance method is merely an example and is not limited to the above example.

[0100] At step 820, the terminal can identify (determine or determine) whether the terminal's mobile status has changed. For example, the terminal can identify whether the terminal's mobile data usage status has changed or whether the DDS has changed.

[0101] At step 830, if the terminal's mobile data usage is initiated or the DDS is changed, the terminal can identify whether the SIM currently used for the terminal's communication service is DDS. For example, the terminal can identify whether the operating SIM is DDS or non-DDS.

[0102] At step 840, if the SIM currently used for the terminal's communication service is a DDS, the terminal can identify whether the terminal's EN-DC is inactive due to "mobile data not in use." "Mobile data not in use" refers to a case where the terminal cannot use mobile data, and "mobile data not in use" may cause the active SIM to be inactive. For example, even if the SIM currently used for the terminal's communication service is a DDS, the terminal can identify whether the terminal's EN-DC is inactive because the terminal is not using mobile data.

[0103] At step 850, if the terminal's EN-DC is currently inactive, the terminal can activate the terminal's EN-DC. Accordingly, the terminal can perform EN-DC to connect to a 5G base station.

[0104] At step 860, if the mobile status has not changed at step 820, or if the SIM used for the current communication service of the terminal is non-DDS at step 830, the terminal can identify whether a specific network operator can support EN-DC based on the database generated at step 810. For example, the terminal can identify whether it can connect to any one network (e.g., a 5G base station) included in the database based on information about at least one network operator that supports EN-DC. At this time, if the specific network operator is identified as not supporting EN-DC based on the database, the terminal may not perform the EN-DC control method of the terminal according to the present disclosure.

[0105] At step 870, if a specific network operator is identified as not supporting EN-DC based on the database, the terminal may deactivate EN-DC in the "mobile data not in use" state. For example, the terminal may deactivate EN-DC if the SIM currently used for the communication service is non-DDS and mobile data is not being used. Accordingly, the terminal may not receive measurement configuration information for performing measurement reporting for a 5G cell from the base station. For example, even if the terminal receives measurement configuration information for performing measurement reporting for a 5G cell from the base station, the terminal may not perform subsequent procedures for connecting to the 5G base station (e.g., at least one of steps 520 to 550 of FIG. 5 ).

[0106] In step 880, the terminal may update the base station with the status of the EN-DC function (or capability) of the terminal that has been changed through step 850 or step 870. For example, if the EN-DC of the terminal is deactivated through step 870 or the EN-DC status of the terminal is activated through step 850, the terminal may transmit information about the changed EN-DC status to the base station. In one embodiment, the information about the status of the EN-DC function of the terminal may be included in the UE Capability Information that the terminal transmits to the base station in response to the base station's request for terminal capability information (e.g., UE Capability Enquiry). Accordingly, the base station may determine whether to perform procedures for the terminal to connect to the 5G base station based on the changed EN-DC status of the terminal. For example, if the EN-DC of the terminal is deactivated through step 870, the base station may identify (determine or determine) that the terminal does not need to connect to the 5G base station and may not transmit measurement configuration information for the terminal's measurement report to the terminal. Alternatively, if EN-DC of the terminal is activated through step 850, the base station may identify (judge or determine) that the terminal needs to connect to a 5G base station, and transmit measurement configuration information for the terminal's measurement report to the terminal.

[0107] The operations of the terminal and base station described above are merely examples. Some of the operations described above may be omitted, or more may be combined. Furthermore, at least one new operation, in addition to the operations described above, may be added and organically combined with existing operations.

[0108] FIG. 9 illustrates an example of a database according to various embodiments of the present disclosure.

[0109] Referring to FIG. 9, the information contained in the database of steps 710 or 810 described above can be described. For example, information regarding a network operator (e.g., a telecommunications carrier) received by a terminal from a base station may include at least one of the network operator's name, a public land mobile network (PLMN), or information regarding EN-DC support. Of course, the configuration of the database described above is merely an example and is not limited to the above example. Accordingly, the database may also include only information regarding network operators that support EN-DC.

[0110] The terminal can periodically or dynamically receive information about new network operators from the base station. Accordingly, the terminal can update its database based on the newly received information about the network operator.

[0111] In one embodiment, when a terminal receives information about a new network operator from a base station, the terminal may add information about the new network operator to a database.

[0112] In one embodiment, if the information about the network operator received by the terminal from the base station is different from the information about the network operator stored in the terminal, the terminal may update the information about the network operator contained in the database based on the newly received information about the network operator.

[0113] In one embodiment, when the terminal receives information about a new network operator from the base station, the terminal may delete information about existing network operators except for the new network operator that is not included in the database.

[0114] The above-described embodiments are merely examples, and the above-described examples may describe one embodiment.

[0115] FIG. 10 illustrates an update procedure of an EN-DC state of a terminal according to various embodiments of the present disclosure.

[0116] Referring to FIG. 10, when the terminal uses mobile data, the update operation of the changed EN-DC state of FIG. 8 described above (for example, step 880) can be specifically described. However, description of the overlapping content described in FIGS. 7 to 9 described above may be omitted.

[0117] In step 1010, the DDS of the terminal can transmit and / or receive mobile data to and from the base station. For example, the DDS can transmit and / or receive mobile data to and from the base station via a single transceiver. Therefore, a non-DDS of the terminal may have difficulty transmitting and receiving mobile data to and from the base station via a transceiver.

[0118] At step 1020, the terminal can identify the current stack. For example, if the SIM currently used for the terminal's communication service is DDS, the terminal can transmit and / or receive mobile data as in step 1010. However, if the SIM currently used for the terminal's communication service is non-DDS, the terminal cannot transmit and / or receive mobile data. Therefore, if the SIM currently used for the communication service is identified as non-DDS, the terminal may be connected to a 4G base station. Therefore, the terminal may not be able to use mobile data. Therefore, the terminal can perform a connection procedure to a 5G base station to use mobile data. At step 1030, if a specific network operator is identified as supporting EN-DC based on the database, the terminal can deactivate the EN-DC in the "mobile data not in use" state. At this time, "mobile data not in use" refers to a case where the terminal cannot use mobile data, and "mobile data not in use" may cause the deactivation of the active SIM. For example, the terminal may disable EN-DC of the terminal if the SIM currently being used for communication services is non-DDS and mobile data is not being used.

[0119] In step 1040, the terminal may update the status of the EN-DC function (or capability) of the terminal that has been changed through step 1030 to the base station. For example, if the EN-DC of the terminal is deactivated through step 1030, the terminal may transmit information about the changed EN-DC status to the base station. In one embodiment, the terminal may transmit a message (e.g., a TRACKING AREA UPDATE REQUEST message) including information indicating that EN-DC is not supported to the base station. In one embodiment, information about the status of the EN-DC function of the terminal may be included in a UE Capability Information (UE Capability Information) that the terminal transmits to the base station in response to a request for UE capability information from the base station (e.g., a UE Capability Enquiry). For example, information indicating that EN-DC of the terminal is not supported may use an indicator of one or more bits.

[0120] The base station can identify (judge or determine) that the terminal does not need to connect to the 5G base station by receiving information from the terminal indicating that the terminal's EN-DC is not supported. The base station may not transmit measurement configuration information for the terminal's measurement report to the terminal. Therefore, the terminal may not need to measure the 5G cell or report the measurement results. In addition, the base station may not transmit 5G SCG configuration information to the terminal. However, the base station may transmit information regarding the 5G SA (standalone) cell measurement frequency to the terminal, and the terminal may connect to the 5G SA base station.

[0121] The operations of the terminal and base station described above are merely examples. Some of the operations described above may be omitted, or more may be combined. Furthermore, at least one new operation, in addition to the operations described above, may be added and organically combined with existing operations.

[0122] FIG. 11 illustrates a procedure for controlling EN-DC of a terminal according to various embodiments of the present disclosure.

[0123] Referring to FIG. 11, a method for releasing a connection with a 5G base station to reduce power consumption of a terminal when the terminal is already connected to a 5G base station may be described. More specifically, if the terminal is connected to a 5G NSA base station, but the SIM currently used for the terminal's communication service does not use mobile data in a non-DDS manner, the terminal may release the connection with the 5G NSA base station.

[0124] At step 1110, the terminal may receive configuration information for connecting to a 5G base station (e.g., 5G SCG) from the base station. The configuration information for connecting to the 5G base station may be based on a measurement report from the terminal. Prior to step 1110, the measurement report procedure described above in FIG. 6 (e.g., steps 630 to 650) may be performed between the terminal and the base station.

[0125] At step 1120, the terminal may perform a connection (camp-on) procedure to the 5G base station based on the configuration information of the 5G base station received at step 1110. Accordingly, the terminal connected to the 5G base station may transmit and / or receive mobile data with the 5G base station. However, unlike the above-described embodiment (e.g., FIG. 7-10), if the terminal is not using mobile data while already connected to the 5G base station, the terminal may include an operation for disconnecting the connection with the 5G base station.

[0126] At step 1130, the terminal can identify whether the SIM currently used for the communication service is non-DDS. If the SIM currently used for the communication service of the terminal is DDS, the terminal can transmit and / or receive mobile data with the connected 5G base station, and thus the terminal may not disconnect from the 5G base station. However, if the SIM currently used for the communication service of the terminal is non-DDS, the terminal does not need to transmit and / or receive mobile data with the base station, and thus may not need to maintain the connection with the 5G base station. Therefore, if the SIM currently used for the communication service is non-DDS, the terminal can reduce power consumption due to operating in EN-DC by performing the following operations to disconnect from the 5G base station. This is because, although the data transmission and reception speed may be improved when the terminal is also connected to a 5G base station compared to when it is connected only to a 4G base station, power consumption may increase due to more signaling. Additionally, power consumption may increase because the terminal continues to perform measurement and measurement reporting operations for surrounding 5G cells to maintain connection with the 5G base station due to movement of the terminal, etc.

[0127] At step 1140, the terminal may transmit a message to the base station containing information indicating that a 5G NSA connection is not required if the SIM currently used for the communication service is non-DDS. The information indicating that a 5G NSA connection is not required may include an indicator of one or more bits. After notifying the base station that a 5G NSA connection is not required, the terminal may not perform measurement and measurement reporting operations for surrounding 5G cells. Therefore, the terminal's power consumption may be reduced.

[0128] At step 1150, the terminal may receive a message from the base station to release the 5G NSA connection. For example, if the base station receives information indicating that the 5G NSA connection is not required from the terminal, the base station may transmit a message (e.g., RRCConnectionRelease) to the terminal to release the 5G NSA connection with the terminal. The terminal may maintain a connection state with the 4G base station even after releasing the connection with the 5G base station. Of course, the terminal may resume the connection procedure with the 5G base station even after releasing the connection with the 5G base station. In addition, the terminal may perform operations for controlling the EN-DC of the terminal according to the above-described embodiments (e.g., FIGS. 7 to 10 ).

[0129] The operations of the terminal and base station described above are merely examples. Some of the operations described above may be omitted, or more may be combined. Furthermore, at least one new operation, in addition to the operations described above, may be added and organically combined with existing operations.

[0130] FIG. 12 illustrates an operation sequence between a terminal and a base station according to various embodiments of the present disclosure.

[0131] Referring to FIG. 12, the signal flow in the operation for a terminal to disconnect from a 5G base station according to FIG. 11 described above may be described. However, descriptions of content that overlaps with the content described in FIG. 11 described above may be omitted.

[0132] At step 1210, the DDS of the terminal can transmit and / or receive mobile data to and from the base station. For example, the DDS can transmit and / or receive mobile data to and from the base station via a single transceiver. Therefore, a non-DDS of the terminal may have difficulty transmitting and receiving mobile data to and from the base station via a transceiver.

[0133] At step 1220, the terminal can identify the current stack. For example, if the SIM currently used for the terminal's communication service is DDS, the terminal can transmit and / or receive mobile data as in step 1210. However, if the SIM currently used for the terminal's communication service is non-DDS, the terminal cannot transmit and / or receive mobile data. Therefore, if the SIM currently used for the communication service is identified as non-DDS, the terminal may be connected to a 4G base station. Therefore, the terminal may not be able to use mobile data. Accordingly, the terminal can perform a connection procedure to a 5G base station to use mobile data. The base station can transmit measurement configuration information to the terminal for measurement reporting on the terminal's 5G cell. For example, if the terminal is not currently using mobile data, the base station can transmit the measurement configuration information to the terminal. The terminal can perform measurements on a neighboring cell (e.g., a 5G cell) based on the measurement configuration information received from the base station. And the terminal can perform measurements on neighboring cells (e.g., 5G cells). For example, the terminal can measure the signal quality (e.g., RSRP, RSRQ) of the neighboring cells. The terminal can transmit a measurement report including the measurement results for the neighboring cells to the base station. At this time, the measurement report can be triggered by an event triggering condition included in the measurement configuration information. For example, the terminal can report the measurement result when a specific event occurs. At this time, the target cell for each event can be predetermined. For example, the measurement report can include the signal quality (e.g., RSRP, RSRQ) of the neighboring cells measured by the terminal and the identifiers of the neighboring cells.

[0134] At step 1230, the base station may transmit configuration information for the terminal to connect to the base station (e.g., 5G SCG) based on the measurement report received from the terminal. For example, the configuration information for the terminal to connect to the base station may be included in an RRC connection reconfiguration (e.g., RRCConnectionReconfiguration) message.

[0135] In step 1240, the terminal may perform a camp-on procedure to a 5G base station based on the configuration information of the 5G base station received in step 1230. The camp-on procedure to a 5G base station of FIG. 12 (e.g., steps 1230 to 1230 ) may include the same or similar operations as the operations of FIG. 5 described above (e.g., steps 510 to 550 ). At this time, if the SIM currently used for the communication service of the terminal is non-DDS, the terminal does not need to transmit and / or receive mobile data with the base station, and thus may not need to maintain the connection with the 5G base station. Accordingly, the terminal may reduce power consumption due to operating in EN-DC by performing the following operations to terminate the connection with the 5G base station when the SIM currently used for the communication service is non-DDS.

[0136] In step 1250, the terminal may transmit to the base station a message including information indicating that a 5G NSA connection is not required in response to the RRC connection reconfiguration message in step 1230. For example, if the SIM currently used for the communication service is non-DDS, the terminal may transmit to the base station a message including information indicating that a 5G NSA connection is not required. At this time, the information indicating that a 5G NSA connection is not required may include an indicator of one or more bits. The information indicating that a 5G NSA connection is not required may be included in a terminal assistance information (e.g., UEAssistanceInformation) message. Additionally, the terminal assistance information may be a response to the RRC connection reconfiguration information received by the terminal from the base station. After notifying the base station that a 5G NSA connection is not required, the terminal may not perform measurement and measurement reporting operations for surrounding 5G cells. Therefore, power consumption of the terminal may be reduced.

[0137] At step 1260, if the base station receives information indicating that a 5G NSA connection is not required from the terminal, the base station may transmit a message (e.g., RRCConnectionRelease) to the terminal to release the 5G NSA connection with the terminal. The terminal may maintain a connection with the 4G base station even after releasing the connection with the 5G base station. Of course, the terminal may resume the connection procedure with the 5G base station even after releasing the connection with the 5G base station. In addition, the terminal may perform operations for controlling the EN-DC of the terminal according to the above-described embodiments (e.g., FIGS. 7 to 10 ).

[0138] The operations of the terminal and base station described above are merely examples. Some of the operations described above may be omitted, or more may be combined. Furthermore, at least one new operation, in addition to the operations described above, may be added and organically combined with existing operations.

[0139] FIG. 13 illustrates a procedure for controlling EN-DC of a terminal according to various embodiments of the present disclosure.

[0140] Referring to FIG. 13, a method for reducing power consumption of a terminal by not performing a connection procedure with a 5G base station when the terminal has already received configuration information for connecting to a 5G base station can be described. More specifically, when the terminal has received configuration information (e.g., RRCConnectionReconfiguration) for connecting to a 5G NSA base station from the base station, but the SIM currently used for the terminal's communication service does not use mobile data as non-DDS, the terminal may not perform a connection procedure with the 5G NSA base station.

[0141] At step 1310, the terminal may receive configuration information for connecting to a 5G base station (e.g., 5G SCG) from the base station. The configuration information for connecting to the 5G base station may be based on a measurement report from the terminal. Prior to step 1310, the measurement report procedure described above in FIG. 6 (e.g., steps 630 to 650) may be performed between the terminal and the base station.

[0142] At step 1320, the terminal can identify whether the SIM currently used for the communication service is non-DDS. If the SIM currently used for the communication service of the terminal is DDS, the terminal can transmit and / or receive mobile data with the connected 5G base station, and thus the terminal may not disconnect from the 5G base station. However, if the SIM currently used for the communication service of the terminal is non-DDS, the terminal does not need to transmit and / or receive mobile data with the base station, and thus may not need to maintain the connection with the 5G base station. Therefore, if the SIM currently used for the communication service is non-DDS, the terminal can reduce power consumption due to operating in EN-DC by performing the following operations to disconnect from the 5G base station. This is because, although the data transmission and reception speed may be improved when the terminal is also connected to a 5G base station compared to when it is connected only to a 4G base station, power consumption may increase due to more signaling. Additionally, power consumption may increase because the terminal continues to perform measurement and measurement reporting operations for surrounding 5G cells to maintain connection with the 5G base station due to movement of the terminal, etc.

[0143] At step 1330, if the SIM currently used for the communication service is non-DDS, the terminal may ignore (or discard) the configuration information received from the base station at step 1310. For example, if the SIM currently used for the communication service is non-DDS, the terminal may ignore the configuration information for connection to the 5G base station received from the base station at step 1320 because 5G NSA connection is not required. The terminal may not perform a connection procedure to the 5G base station based on the configuration information. Therefore, the terminal may reduce power consumption due to the connection procedure to the 5G base station.

[0144] At step 1340, the terminal may transmit a message to the base station including information indicating that the configuration for connecting to the 5G base station is ignored. At this time, the information indicating that the configuration for connecting to the 5G base station is ignored may include an indicator of one or more bits. The terminal may not perform a connection procedure with the 5G base station. Accordingly, the terminal may prevent or reduce power consumption required for performing a connection procedure with the 5G base station. The terminal may maintain a connection state with the 4G base station even when not performing a connection with the 5G base station. Of course, the terminal may resume the connection procedure with the 5G base station even when not performing a connection with the 5G base station. In addition, the terminal may perform operations for controlling the EN-DC of the terminal according to the above-described embodiments (e.g., FIGS. 7 to 10 ).

[0145] The operations of the terminal and base station described above are merely examples. Some of the operations described above may be omitted, or more may be combined. Furthermore, at least one new operation, in addition to the operations described above, may be added and organically combined with existing operations.

[0146] FIG. 14 illustrates an operation sequence between a terminal and a base station according to various embodiments of the present disclosure.

[0147] Referring to FIG. 14, an operation sequence between a terminal and a base station according to various embodiments of the present disclosure is illustrated.

[0148] Referring to FIG. 14, a method for reducing power consumption of a terminal by not performing a connection procedure with a 5G base station when the terminal has already received configuration information for connecting to a 5G base station can be described. For example, if a terminal has received configuration information (e.g., RRCConnectionReconfiguration) for connecting to a 5G NSA base station from the base station, but the SIM currently used for the terminal's communication service does not use mobile data as a non-DDS, the terminal may not perform a connection procedure with the 5G NSA base station.

[0149] At step 1410, the DDS of the terminal can transmit and / or receive mobile data to and from the base station. For example, the DDS can transmit and / or receive mobile data to and from the base station via a single transceiver. Therefore, a non-DDS of the terminal may have difficulty transmitting and receiving mobile data to and from the base station via a transceiver.

[0150] At step 1420, the terminal can identify the current stack. For example, if the SIM currently used for the terminal's communication service is DDS, the terminal can transmit and / or receive mobile data as in step 1210. However, if the SIM currently used for the terminal's communication service is non-DDS, the terminal cannot transmit and / or receive mobile data. Therefore, if the SIM currently used for the communication service is identified as non-DDS, the terminal may be connected to a 4G base station. Therefore, the terminal may not be able to use mobile data. Accordingly, the terminal can perform a connection procedure to a 5G base station to use mobile data. The base station can transmit measurement configuration information to the terminal for measurement reporting for the terminal's 5G cell. For example, if the terminal is not currently using mobile data, the base station can transmit the measurement configuration information to the terminal. The terminal can perform measurements for a neighboring cell (e.g., a 5G cell) based on the measurement configuration information received from the base station. And the terminal can perform measurements on neighboring cells (e.g., 5G cells). For example, the terminal can measure the signal quality (e.g., RSRP, RSRQ) of the neighboring cells. The terminal can transmit a measurement report including the measurement results for the neighboring cells to the base station. At this time, the measurement report can be triggered by an event triggering condition included in the measurement configuration information. For example, the terminal can report the measurement result when a specific event occurs. At this time, the target cell for each event can be predetermined. For example, the measurement report can include the signal quality (e.g., RSRP, RSRQ) of the neighboring cells measured by the terminal and the identifiers of the neighboring cells.

[0151] At step 1430, the base station may transmit configuration information for the terminal to connect to the base station (e.g., 5G SCG) based on the measurement report received from the terminal. For example, the configuration information for the terminal to connect to the base station may be included in an RRC connection reconfiguration (e.g., RRCConnectionReconfiguration) message.

[0152] At step 1440, if the SIM currently used for the communication service is non-DDS, the terminal may ignore (or discard) the configuration information received from the base station at step 1430. For example, if the SIM currently used for the communication service is non-DDS, the terminal may not require 5G NSA connection, and thus may ignore the configuration information for connection to the 5G base station received from the base station at step 1430. The terminal may not perform a connection procedure to the 5G base station based on the configuration information. Accordingly, the terminal may reduce power consumption due to the connection procedure to the 5G base station.

[0153] In step 1450, the terminal may transmit SCG failure information (e.g., SCGFailureInformation) to the base station in response to the RRC connection reconfiguration message in step 1430. At this time, the SCG failure information may include information indicating that the configuration for connecting to the 5G base station is ignored. The information indicating that the configuration for connecting to the 5G base station is ignored may include an indicator of one or more bits. The 5G base station may not perform a connection procedure with the terminal. Accordingly, the terminal may prevent or reduce power consumption required for performing a connection procedure with the 5G base station. The terminal may maintain a connection state with the 4G base station even when not performing a connection with the 5G base station. Of course, the terminal may resume the connection procedure with the 5G base station even when not performing a connection with the 5G base station. In addition, the terminal may perform operations for controlling the EN-DC of the terminal according to the above-described embodiments (e.g., FIGS. 7 to 10).

[0154] The operations of the terminal and base station described above are merely examples. Some of the operations described above may be omitted, or more may be combined. Furthermore, at least one new operation, in addition to the operations described above, may be added and organically combined with existing operations.

[0155] FIG. 15 illustrates the operation of a terminal according to various embodiments of the present disclosure.

[0156] Referring to FIG. 15, a method for EN-DC control of a terminal can be described.

[0157] At step 1510, if the mobile status of the terminal changes, the terminal can determine whether to activate the dual connection of the terminal based on the type of SIM currently used for the communication service. More specifically, the terminal can identify (judge or determine) whether the mobile status of the terminal has changed. For example, the terminal can identify whether the mobile data usage status of the terminal has changed or the DDS has changed. At this time, if the mobile data usage of the terminal has started or the DDS has changed, the terminal can identify whether the SIM currently used for the communication service of the terminal is DDS. For example, the terminal can identify whether the SIM currently in operation is DDS or non-DDS. If the SIM currently used for the communication service of the terminal is DDS, the terminal can identify whether the EN-DC of the terminal is in an inactive state due to "mobile data not in use." At this time, "mobile data not in use" refers to a case where the terminal cannot use mobile data, and "mobile data not in use" may cause the inactive SIM to be deactivated. For example, even though the SIM currently used for the terminal's communication service is DDS, it can be identified that the terminal's EN-DC is inactive because the terminal does not use mobile data. If the EN-DC of the terminal is currently inactive, the terminal can activate the EN-DC of the terminal. Accordingly, the terminal can perform EN-DC to connect to a 5G base station. Alternatively, if the mobile status of the terminal has not changed or the SIM currently used for the terminal's communication service is non-DDS, the terminal can identify whether a specific network operator can support EN-DC based on a stored database. For example, the terminal can identify whether it can connect to any one network (e.g., a 5G base station) included in the database based on information about at least one network operator that supports EN-DC.If a specific network operator is identified as supporting EN-DC based on the database, the terminal may deactivate EN-DC in the "mobile data not in use" state. For example, the terminal may deactivate EN-DC if the SIM currently used for communication services is non-DDS and mobile data is not being used. Accordingly, the terminal may not receive measurement configuration information for performing measurement reporting for 5G cells from the base station. Alternatively, even if the terminal receives measurement configuration information for performing measurement reporting for 5G cells from the base station, it may not perform subsequent procedures (e.g., measurement reporting) for connecting to the 5G base station.

[0158] In step 1520, the terminal may update the base station with the status of the EN-DC function (or capability) of the terminal that has been changed through step 1510. For example, if the EN-DC of the terminal is deactivated or activated, the terminal may transmit information regarding the changed EN-DC status to the base station. In one embodiment, the information regarding the status of the EN-DC function of the terminal may be included in the UE Capability Information that the terminal transmits to the base station in response to the base station's request for terminal capability information (e.g., UE Capability Enquiry). Accordingly, the base station may determine whether to perform procedures for the terminal to connect to a 5G base station based on the changed EN-DC status of the terminal. For example, if the EN-DC of the terminal is deactivated, the base station may identify (determine or determine) that the terminal does not need to connect to a 5G base station and may not transmit measurement configuration information for the terminal's measurement report to the terminal. Alternatively, if the EN-DC of the terminal is activated, the base station may identify (judge or determine) that the terminal needs to connect to a 5G base station, and transmit measurement configuration information for the terminal's measurement report to the terminal.

[0159] The operations of the terminal and base station described above may include the same or similar operations as those of the above-described drawings 7 or 8, and any duplicate descriptions may be omitted.

[0160] According to various embodiments of the present disclosure, a method of a terminal including a plurality of subscriber identification modules (SIMs) in a wireless communication system includes an operation of determining whether to activate a dual connectivity function of the terminal based on a type of SIM used for a current communication service of the terminal, and an operation of transmitting information regarding whether to activate the dual connectivity function to a base station, wherein the terminal and the base station support the dual connectivity function, the plurality of SIMs include a first SIM and a second SIM, and the first SIM and the second SIM include different subscription information.

[0161] According to one embodiment, the method further includes, when use of mobile data of the terminal is initiated and the SIM used for the current communication service is a first SIM, activating the dual connection function for transmitting and receiving the mobile data to and from the base station using the first SIM.

[0162] According to one embodiment, the method may further include receiving first information about at least one first network from the base station, identifying a network among the at least one first network that supports the dual connectivity function based on the first information when the use of mobile data of the terminal is terminated or the SIM currently used for the communication service is a second SIM, and disabling the dual connectivity function when the network is identified.

[0163] According to one embodiment, the method may further include receiving second information about at least one second network from the base station, and updating the first information based on the second information.

[0164] According to one embodiment, the first information includes at least one of information regarding the operator of each of the at least one first network, a public land mobile network (PLMN), or whether the dual connectivity function is supported, and the second information includes at least one of information regarding the operator of each of the at least one second network, a PLMN, or whether the dual connectivity function is supported, and information regarding networks that are not included in the at least one second network may be removed from the first information.

[0165] According to one embodiment, the method may further include receiving radio resource control (RRC) resetting information for the dual connection from the base station, and transmitting first information indicating that the RRC resetting information is to be ignored to the base station when the SIM used for the current communication service is the second SIM.

[0166] According to one embodiment, the method may further include, based on the RRC resetting information, an operation of connecting to the base station, and, if the SIM used for the communication service is the second SIM, an operation of transmitting second information to the base station indicating that connection with the base station is not required.

[0167] According to one embodiment, the first information is included in secondary cell group (SCG) failure information in response to the RRC resetting information, the second information is included in terminal assistance information in response to the RRC resetting information, and the first information and the second information can each be transmitted in the form of a 1-bit indicator.

[0168] According to one embodiment, the first SIM may be a default data subscriber identification module (DDS, default data SIM) used for at least one service of transmitting and receiving mobile data, voice calls, or short message service (SMS) with the base station, and the second SIM may be a non-DDS used for at least one service of the voice calls or SMS with the base station.

[0169] In one embodiment, the dual connectivity function may be an ENDC (Evolved Universal Mobile Telecommunications System (UMTS) terrestrial radio access (E-UTRA)-New Radio (NR) dual connectivity) function.

[0170] According to various embodiments of the present disclosure, a terminal including a plurality of subscriber identification modules (SIMs) in a wireless communication system includes a transceiver, a first SIM, a second SIM, and at least one processor coupled with the transceiver, the first SIM, and the second SIM, wherein the at least one processor determines whether to activate a dual connectivity function of the terminal based on a type of SIM used for a current communication service of the terminal, and transmits information regarding whether to activate the dual connectivity function to a base station, wherein the terminal and the base station support the dual connectivity function, and the plurality of SIMs include the first SIM and the second SIM, and the first SIM and the second SIM may include different subscription information.

[0171] According to one embodiment, the at least one processor may activate the dual connectivity function for transmitting and receiving the mobile data to and from the base station using the first SIM when the use of mobile data of the terminal is initiated and the SIM used for the current communication service is the first SIM.

[0172] According to one embodiment, the at least one processor receives first information about at least one first network from the base station, and, when the use of mobile data of the terminal is terminated or the SIM currently used for the communication service is a second SIM, identifies a network among the at least one first network that supports the dual connectivity function based on the first information, and, when the network is identified, deactivates the dual connectivity function.

[0173] In one embodiment, the at least one processor may receive second information about at least one second network from the base station and update the first information based on the second information.

[0174] According to one embodiment, the first information includes at least one of information regarding the operator of each of the at least one first network, a public land mobile network (PLMN), or whether the dual connectivity function is supported, and the second information includes at least one of information regarding the operator of each of the at least one second network, a PLMN, or whether the dual connectivity function is supported, and information regarding networks that are not included in the at least one second network may be removed from the first information.

[0175] According to one embodiment, the at least one processor may receive radio resource control (RRC) reconfiguration information for the dual connection from the base station, and, if the SIM used for the current communication service is the second SIM, transmit first information to the base station indicating that the RRC reconfiguration information is to be ignored.

[0176] According to one embodiment, the at least one processor may, based on the RRC reset information, connect to the base station and, if the SIM used for the communication service is the second SIM, transmit second information to the base station indicating that connection with the base station is not required.

[0177] According to one embodiment, the first information is included in secondary cell group (SCG) failure information in response to the RRC resetting information, the second information is included in terminal assistance information in response to the RRC resetting information, and the first information and the second information can each be transmitted in the form of a 1-bit indicator.

[0178] According to one embodiment, the first SIM may be a default data subscriber identification module (DDS, default data SIM) used for at least one service of transmitting and receiving mobile data, voice calls, or short message service (SMS) with the base station, and the second SIM may be a non-DDS used for at least one service of the voice calls or SMS with the base station.

[0179] In one embodiment, the dual connectivity function may be an ENDC (Evolved Universal Mobile Telecommunications System (UMTS) terrestrial radio access (E-UTRA)-New Radio (NR) dual connectivity) function.

[0180] It should be noted that the aforementioned configuration diagrams, examples of control / data signal transmission methods, examples of operational procedures, and configuration diagrams are not intended to limit the scope of the present disclosure. That is, not all components, entities, or operational steps described in the embodiments of the present disclosure should be construed as essential components for implementing the disclosure, and implementations may be made without detracting from the essence of the disclosure even if only some components are included. Furthermore, each embodiment may be combined and operated as needed. For example, parts of the methods proposed in the present disclosure may be combined to operate network entities and terminals.

[0181] The operations of the base station or terminal described above can be realized by providing a memory device storing the corresponding program code in any component within the base station or terminal device. That is, the control unit of the base station or terminal device can execute the operations described above by reading and executing the program code stored in the memory device using a processor or CPU (Central Processing Unit).

[0182] The various components and modules of the entity, base station or terminal device described in this specification may be operated using hardware circuits, such as logic circuits based on complementary metal oxide semiconductors, firmware, software and / or hardware and firmware and / or software embedded in a machine-readable medium. For example, various electrical structures and methods may be implemented using electrical circuits such as transistors, logic gates and application-specific semiconductors.

[0183] When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. The one or more programs include instructions that cause the electronic device to execute methods according to embodiments described in the claims or specification of the present disclosure.

[0184] These programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable read only memory (EEPROM), magnetic disc storage device, compact disc ROM (CD-ROM), digital versatile discs (DVDs) or other forms of optical storage device, magnetic cassette. Or, they may be stored in a memory configured as a combination of some or all of these. In addition, each configuration memory may be included in multiple numbers.

[0185] Additionally, the program may be stored in an attachable storage device that is accessible via a communication network such as the Internet, an intranet, a local area network (LAN), a wide local area network (WLAN), a storage area network (SAN), or a combination thereof. Such a storage device may be connected to a device performing an embodiment of the present disclosure via an external port. Additionally, a separate storage device on the communication network may be connected to a device performing an embodiment of the present disclosure.

[0186] In the specific embodiments of the present disclosure described above, components included in the disclosure are expressed singularly or plurally, depending on the specific embodiment presented. However, the singular or plural expressions are selected to suit the presented situation for convenience of explanation, and the present disclosure is not limited to singular or plural components. Components expressed in plural may be composed of singular elements, or components expressed in singular may be composed of plural elements.

[0187] While the detailed description of the present disclosure has described specific embodiments, it should be understood that various modifications are possible without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure should not be limited to the described embodiments, but should be determined not only by the scope of the claims described below but also by equivalents thereof. In other words, it will be apparent to those skilled in the art that other modifications based on the technical idea of ​​the present disclosure are possible. In addition, the above-described embodiments can be combined and operated with each other as needed. For example, parts of the methods proposed in the present disclosure can be combined with each other to operate a base station and a terminal. In addition, although the above-described embodiments have been presented based on a 5G, NR system, other modifications based on the technical idea of ​​the above-described embodiments can be implemented with other systems such as LTE, LTE-A, and LTE-A-Pro systems.

Claims

1. A method performed by a terminal including a plurality of SIMs (subscriber identification modules) in a wireless communication system, An operation for determining whether to activate the dual connectivity function of the terminal based on the type of SIM used for the current communication service of the terminal; and Including an operation of transmitting information to a base station regarding whether the above dual connection function is activated, The above terminal and the above base station are set to support the dual connection function, A method wherein the plurality of SIMs include a first SIM and a second SIM, wherein the first SIM and the second SIM include different subscription information.

2. In claim 1, the method comprises: A method further comprising: when use of mobile data of the terminal is initiated and the SIM used for the current communication service is a first SIM, an operation of activating the dual connection function for transmitting and receiving the mobile data with the base station using the first SIM.

3. In claim 1, the method comprises: An operation of receiving first information about at least one first network from the base station; When the use of mobile data of the terminal is terminated or the SIM currently used for the communication service is a second SIM, an operation of identifying a network that supports the dual connection function among the at least one first network based on the first information; and A method further comprising the action of disabling said dual connectivity feature if said network is identified.

4. In claim 3, the method comprises: An operation of receiving second information about at least one second network from said base station; and A method further comprising an action of updating the first information based on the second information.

5. In claim 4, The first information includes at least one of information about the operator of each of the at least one first network, a public land mobile network (PLMN), or whether the dual connectivity function is supported, The second information comprises at least one of information regarding the operator, PLMN, or support of the dual connectivity function of each of the at least one second networks, A method wherein information about a network that is not included in at least one second network is removed from the first information.

6. In claim 1, the method comprises: An operation of receiving RRC (radio resource control) reset information for the dual connection from the base station; and A method further comprising the action of transmitting first information indicating that the RRC reset information is to be ignored to the base station when the SIM used for the current communication service is the second SIM.

7. In claim 6, the method comprises: An operation of connecting to the base station based on the above RRC reset information; and A method further comprising the action of transmitting second information to the base station indicating that connection with the base station is not required when the SIM used for the communication service is the second SIM.

8. In claim 7, The above first information is included in the SCG (secondary cell group) failure information in response to the RRC reconfiguration information, The above second information is included in the terminal assistance information in response to the RRC reconfiguration information, The above first information and the above second information are each transmitted in the form of a 1-bit indicator, The above first SIM includes a DDS (default data SIM) used for at least one of the services of transmitting and receiving mobile data, voice calls, or SMS (short message service) with the base station, A method wherein the second SIM comprises a non-DDS used for at least one service among the base station and the voice call or the SMS.

9. A terminal including multiple SIMs (subscriber identification modules) in a wireless communication system, transceiver; 1st SIM; 2nd SIM; and At least one processor coupled with the transceiver, the first SIM, and the second SIM; At least one processor of the above, Based on the type of SIM used for the current communication service of the terminal, determine whether to activate the dual connectivity function of the terminal, It is set to transmit information to the base station regarding whether the above dual connection function is activated, The above terminal and the above base station are set to support the dual connection function, A terminal wherein the plurality of SIMs include the first SIM and the second SIM, and the first SIM and the second SIM include different subscription information.

10. In claim 9, at least one processor, A terminal further configured to activate the dual connectivity function for transmitting and receiving mobile data to and from the base station using the first SIM when use of mobile data of the terminal is initiated and the SIM used for the current communication service is the first SIM.

11. In claim 9, the at least one processor, Receive first information about at least one first network from the base station, When the use of mobile data of the terminal is terminated or the SIM used for the current communication service is a second SIM, a network supporting the dual connection function among the at least one first network is identified based on the first information, A terminal further configured to disable the dual connection function when the above network is identified.

12. In claim 11, at least one processor, Receive second information about at least one second network from the base station, A terminal further configured to update the first information based on the second information.

13. In claim 12, The first information includes at least one of information about the operator of each of the at least one first network, a public land mobile network (PLMN), or whether the dual connectivity function is supported, The second information comprises at least one of information regarding the operator, PLMN, or support of the dual connectivity function of each of the at least one second networks, A terminal in which information about a network that is not included in at least one of the second networks is removed from the first information.

14. In claim 9, the at least one processor, Receive RRC (radio resource control) reset information for the dual connection from the base station, A terminal further configured to transmit first information indicating that the RRC reset information is ignored to the base station when the SIM used for the current communication service is the second SIM.

15. In claim 14, the at least one processor, Based on the above RRC reset information, connect to the base station, If the SIM used for the above communication service is the second SIM, it is further set to transmit second information indicating that connection with the base station is not required to the base station. The above first information is included in the SCG (secondary cell group) failure information in response to the RRC reconfiguration information, The above second information is included in the terminal assistance information in response to the RRC reconfiguration information, The first information and the second information are each transmitted in the form of a 1-bit indicator, The above first SIM includes a DDS (default data SIM) used for at least one of the services of transmitting and receiving mobile data, voice calls, or SMS (short message service) with the base station, A terminal wherein the second SIM includes a non-DDS used for at least one service among the base station and the voice call or the SMS.

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