WO2018139588A1

WO2018139588A1 - Communication terminal, information management method, and computer-readable medium

Info

Publication number: WO2018139588A1
Application number: PCT/JP2018/002511
Authority: WO
Inventors: アナンドラガワプラサド; シババランアルムガム; シバカミーラクシュミナラヤナン; 伊藤　博紀; アンドレアスクンツ; シバパサリンガムシババケッサー
Original assignee: 日本電気株式会社
Priority date: 2017-01-27
Filing date: 2018-01-26
Publication date: 2018-08-02

Abstract

The purpose of the present invention is to provide a communication terminal that, when establishing a connection with a base station, can select a secure base station and establish a connection. This communication terminal (10) comprises: a storage unit (11) that stores list information that represents information on base stations to which a connection can be made or areas in which it is possible to connect to a base station; a determination unit (12) that, on the basis of the list information, determines whether it is possible to connect to a connection candidate base station; and a communication unit (13) that, after a connection to the connection candidate base station has been made, receives the newest list information from a core network device via the base station to which the connection was made.

Description

Communication terminal, information management method, and computer-readable medium

The present disclosure relates to a communication terminal, an information management method, and a computer-readable medium.

A network slice is a collection of logical network functions and a collection of resources for realizing a communication service in a specific use case. Network slicing is a process of dividing one physical network into a plurality of slices.

Non-Patent Document 1 discloses communication terminal registration processing and mobility processing in a 5G system to which a network slice is applied.

When connecting to a communication system such as a 5G system, the communication terminal detects a network slice ID or a cell ID broadcast from the base station, and establishes a connection with the base station. Here, when the communication terminal detects a network slice ID or cell ID that can be connected to any communication terminal, the communication terminal connects to the base station associated with the network slice ID or cell ID. However, such a base station may be managed by a malicious third party. A malicious third party steals traffic of a communication terminal by connecting the communication terminal to a base station. Thus, there is a security problem when the communication terminal establishes a connection with the base station.

In view of the above-described problems, an object of the present disclosure is to provide a communication terminal, an information management method, and a computer-readable medium capable of selecting a secure base station and establishing a connection when establishing a connection with the base station There is to do.

A communication terminal according to the first aspect of the present disclosure includes a storage unit that stores list information indicating information relating to a connectable base station or an area connectable to the base station, and the list information. A determination unit that determines whether or not it is possible to connect to a connection destination candidate base station, and after connecting to the connection destination candidate base station, from the core network device via the connected base station, A communication unit that receives the latest list information.

The information management method according to the second aspect of the present disclosure is based on list information indicating information relating to a connectable base station or an area connectable to the base station, to a base station that is a connection destination candidate It is determined whether or not connection is possible, and after connecting to the connection destination candidate base station, the latest list information is received from the core network device via the connected base station.

The program according to the third aspect of the present disclosure connects to a base station that is a connection destination candidate based on list information indicating information on a connectable base station or an area connectable to the base station. And determining whether it is possible to receive the latest list information from the core network device via the connected base station after connecting to the base station that is the connection destination candidate. Let

According to the present disclosure, it is possible to provide a communication terminal, an information management method, and a computer-readable medium capable of selecting a secure base station and establishing a connection when establishing a connection with the base station.

1 is a configuration diagram of a communication terminal according to a first embodiment. FIG. 10 is a diagram illustrating a flow of Registration processing according to the second embodiment. It is a figure which shows the flow of the Registration process after movement of UE concerning Embodiment 2. FIG. It is a figure which shows the flow of the regular Registration process concerning Embodiment 2. FIG. It is a block diagram of the communication terminal concerning each embodiment. It is an AMF block diagram concerning each embodiment.

(Embodiment 1)
Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. First, a configuration example of the communication terminal 10 according to the first embodiment will be described with reference to FIG. The communication terminal 10 may be a computer device that operates when a processor executes a program stored in a memory. The communication terminal 10 may be, for example, a mobile phone terminal, a smartphone terminal, or a tablet terminal. The communication terminal 10 may be an IoT (Internet of Things) terminal or an MTC (Machine Type Communication) terminal.

The communication terminal 10 includes a storage unit 11, a determination unit 12, and a communication unit 13. The storage unit 11, the determination unit 12, and the communication unit 13 may be software or a module that performs processing when the processor executes a program stored in a memory. Alternatively, the storage unit 11, the determination unit 12, and the communication unit 13 may be hardware such as a circuit or a chip.

The storage unit 11 stores list information indicating information relating to connectable base stations or areas connectable to the base stations. The base station may be gNB (gNodeＮB) used in the 5G system, for example. The connectable base station is, for example, a base station managed as a secure base station. The secure base station may be, for example, a base station that has been permitted by a communication carrier in advance. Information regarding connectable base stations may be indicated using, for example, base station identification information (ID). Further, the information regarding the connectable base station may be a network slice ID indicating a network slice that can be provided by the base station. Further, the information regarding the connectable base station may be a service ID indicating a service that can be provided by the base station. Further, the information regarding connectable base stations may be identification information of base stations that cannot be connected, for example. That is, it can be said that the communication terminal 10 can be connected to a base station other than the identification information of the base station that cannot be connected.

The information regarding the area that can be connected to the base station may be indicated using, for example, a TA (Tracking Area) or a cell. The information regarding the area that can be connected to the base station may indicate at least one of TA and Cell ID, for example. TA is position information defined in 3GPP (3rd generation generation partnership partnership project). Cell is a communication area formed by a base station. Moreover, the information regarding the area that can be connected to the base station may be information indicating an area that cannot be connected to the base station, for example. That is, it can be said that areas other than the area where connection to the base station is impossible are connectable areas. The area that can be connected to the base station may be rephrased as an area where the communication terminal 10 can communicate.

The list information includes identification information of at least one connectable base station or at least one area information. The area information indicates, for example, an area that can be connected to the base station. Alternatively, the list information includes at least one connectable base station identification information and at least one area information.

Further, a base station that cannot be connected may be referred to as a forbidden base station, for example. An area that cannot be connected to the base station may be referred to as a forbidden area.

The storage unit may store list information in advance, for example, as contract information before communication using the communication terminal 10 is executed. The list information stored in advance can be updated.

The determination unit 12 determines whether it is possible to connect to a base station that is a connection destination candidate based on the list information. The communication terminal 10 receives broadcast information from, for example, base stations existing in the vicinity. The base station that is a connection destination candidate may be a base station that is a transmission source of broadcast information. Further, the communication terminal 10 receives cell information, TA information, etc. included in the broadcast information. The base station that is a connection destination candidate may be a base station that forms a cell included in broadcast information as a communication area, or a base station that is arranged in a TA included in broadcast information.

If the base station that is a connection destination candidate is indicated as a connectable base station in the list information, the determination unit 12 determines that it is possible to connect to the base station that is a connection destination candidate. Alternatively, the determination unit 12 may determine that it is possible to connect to a base station that is a connection destination candidate if the base station that is a connection destination candidate is not indicated as a base station that cannot be connected in the list information. Good.

Alternatively, when the cell included in the broadcast information indicates that the cell included in the broadcast information is an area that can be connected to the base station, the determination unit 12 can connect to the base station that is a connection destination candidate. judge. Alternatively, when the cell included in the broadcast information does not indicate that the cell included in the broadcast information is an area that cannot be connected to the base station, the determination unit 12 can connect to the base station that is a connection destination candidate. Is determined.

Alternatively, when the TA included in the broadcast information indicates that the TA included in the broadcast information is an area that can be connected to the base station, the determination unit 12 can connect to the base station that is a connection destination candidate. judge. Alternatively, when the TA included in the broadcast information does not indicate that the TA included in the broadcast information is an area that cannot be connected to the base station, the determination unit 12 can connect to the base station that is a connection destination candidate. Is determined.

After connecting to the base station, the communication unit 13 receives the latest list information from the core network device via the connected base station. The core network device may be an AMF (Access and Mobility Management and Function) entity arranged in a 5G system, for example. The latest list information may be list information managed by the core network device. Alternatively, the latest list information may be information indicating a difference between the list information stored in the storage unit 11 and the list information managed in the core network device. Further, the communication terminal 10 executes an information management method. Specifically, the communication terminal 10 can connect to a base station that is a connection destination candidate based on list information indicating information on a connectable base station or an area connectable to the base station. Determine whether it is possible. Next, the communication terminal 10 receives the latest list information from the core network device via the connected base station after connecting to the base station that is a connection destination candidate.

As described above, the communication terminal 10 holds in advance list information including information on base stations that can be connected as safe base stations. Therefore, when establishing a connection with the base station, the communication terminal 10 can establish a connection only with a base station that is indicated as connectable in the list information.

(Embodiment 2)
Next, the flow of registration processing executed in the communication system defined in 3GPP according to the second embodiment will be described with reference to FIG. The Registration process may be referred to as a location registration process. In FIG. 2 and subsequent figures, processing executed in a communication system having UE 21, gNB 22, AMF 23, AUSF 24, and UDM 25 will be described. UE is a term in which User Equipment is omitted. gNB is a term obtained by omitting gNodeB. AMF is a term that omits Access and Mobility Management Function. Hereinafter, the AMF entity 23 will be described as the AMF 23. AUSF is a term that omits Authentication Server Function. In the following, the AUSF entity 24 will be described as an AUSF 24. UDM is a term that omits Unified Data Management. In the following, the UDM entity 25 will be described as the UDM 25.

UE 21 and gNB 22 constitute an access network. The AMF 23, the AUSF 24, and the UDM 25 constitute a core network.

UE 21, gNB 22, AMF 23, AUSF 24, and UDM 25 may be computer devices that operate when a processor executes a program stored in a memory.

UE21 is used as a general term for communication terminals in 3GPP. The gNB 22 is a base station used in a next generation access network called 5G, for example.

The AMF 23 performs mobility management related to the UE 21. Further, the AMF 23 performs authentication processing related to the UE 21 in cooperation with the AUSF 24 and the UDM 25. For example, the AMF 23 determines whether or not the UE 21 can connect to the gNB managed by the AMF 23.

The UDM 25 manages the subscriber data of the UE 21. The UDM entity may be referred to as a subscriber information management device. The subscriber information management apparatus may include a UDM 25 and a UDR (User Data Repository). The UDR stores subscriber information of the UE 21.

Subsequently, the process flow shown in FIG. 2 will be described. First, the UE 21 transmits a Registration request message to the gNB 22 (S11). The gNB 22 may be a gNB indicated as a connectable base station in the list information held by the UE 21. Alternatively, the gNB 22 may be a gNB that forms an area defined as a communicable area in the list information held by the UE 21.

Next, the gNB 22 selects AMF (S12). For example, when the gNB 22 receives a Registration request message from the UE, the gNB 22 may predetermine an AMF for transferring the Registration request message. The gNB 22 may select a predetermined AMF in step S12. The predetermined AMF may be referred to as a default AMF, for example. In addition, the Network slice ID may be included in the Registration request message received by the gNB 22. In such a case, the gNB 22 may select the AMF associated with the network slice ID included in the Registration request message in step S12. Assume that the gNB 22 selects the AMF 23 in step S12.

Next, the gNB 22 transmits a Registration request message to the AMF 23 (S13). Next, the AMF 23 performs authentication of the UE 21 (S14). Further, NAS (Non-Access Stratum) Security is established between the AMF 23 and the UE 21 (S14). When NAS Security is established between the AMF 23 and the UE 21, the UE 21 may transmit a gNB ID that is identification information of the gNB 22 to the AMF 23. Further, the UE 21 may transmit information regarding the network slice, for example, a network slice ID or a slice type to the AMF 23. When the AMF 23 receives information about the gNB ID and the network slice from the UE 21, it can determine whether the gNB 22 is a secure gNB.

Also, the gNBＮID may be transmitted from the UE 21 to the gNB 22 in a state where AS security is established between the UE 21 and the gNB 22. The AMF 23 may receive the gNB ID transmitted from the UE 21 to the gNB 22 from the gNB 22. Further, the UE 21 may transmit the gNB IDs of the plurality of detected gNBs to the AMF 23, or may transmit the gNB の IDs of all the gNBs included in the list information to the AMF 23.

Next, the AMF 23 transmits an Access list / Information update message to the UE 21 (S15). The Access / list / Information / update message includes the latest list information regarding the UE 21. The list information held by the AMF 23 may be updated when the subscriber information regarding the UE 21 is updated. For example, as the subscriber information related to the UE 21, when a base station to which the UE 21 can be connected is added or deleted, the list information held by the AMF 23 is updated. In addition, when Cell or TA is added or deleted as an area where UE 21 can communicate, the list information held by AMF 23 may be updated.

The AMF 23 may receive the updated subscriber information from the UDM 25 when the subscriber information of the UE 21 managed in the UDM 25 is updated.

When the UE 21 receives the latest list information, the UE 21 updates the held list information to the latest list information. In addition, the AMF 23 transmits the Access / list / Information update message to the UE 21 in a state where integrity and confidentiality are ensured (integrity and confidentiality protection). Alternatively, the Access / list / Information update message may be in a state in which at least one of integrity and confidentiality is ensured (integrity or confidentiality protection).

Further, it is assumed that the AMF 23 performs authentication related to the gNB 22 before the processing shown in FIG. 2 is started. For example, the gNB 22 notifies the AMF 23 of slice capabilities after its own device is activated. The slice capabilities may be, for example, information indicating a network slice that can be notified to the UE 21 by the gNB 22, that is, a network slice ID. The network slice ID notified by the gNB 22 to the UE 21 is a network slice ID that can be used via the gNB 22. For example, the slice よい capabilities may include at least one network slice ID. When the AMF 23 is notified of the slice capabilities from the gNB 22, the AMF 23 holds information associating the gNB22 and the slice capabilities as gNB22 information. Furthermore, the AMF 23 may transmit gNB22 information to other AMFs.

Subsequently, the flow of the registration process when the UE 21 moves performed in the communication system defined in 3GPP according to the second embodiment will be described with reference to FIG. The Registration process when the UE 21 moves may be a handover process, for example. In addition, the Registration process when the UE 21 moves may be referred to as a mobility-registration process.

First, it is assumed that the UE 21 has moved from the communication area formed by the gNB 22 to the communication area formed by the gNB 31. The gNB 31 is a handover destination base station. At this time, UE21 transmits a Mobility request message to gNB31 (S21). The gNB 31 may be a gNB indicated as a connectable base station in the latest list information received by the UE 21 in step S15 of FIG. Alternatively, the gNB 31 may be a gNB that forms an area defined as a communicable area in the latest list information received by the UE 21 in step S15 of FIG.

Next, mutual authentication is performed between the UE 21 and the gNB 31 (S22). Mutual authentication may be performed, for example, in an AKA (Authentication Key Agreement) procedure for determining whether the security key held by the gNB 31 is the same as the security key held by the UE 21. Alternatively, mutual authentication may be performed using a token transmitted from the AMF 23 to the gNB 31. The token is different for each gNB. The token may be updated or changed every time it is used. The AMF 23 may transmit a token to each gNB in the registration process of FIG.

Next, the AMF 23 transmits an Access list / Information update message to the UE 21 (S23). The Access / list / Information / update message includes the latest list information regarding the UE 21.

Here, between step S22 and step S23, the gNB 31 may transmit a message notifying that the connection with the UE 21 is completed to the AMF 23. The AMF 23 may transmit an Access / list / Information / update message to the UE 21 after confirming that the connection with the gNB 31 is completed after the UE 21 moves.

As described above, in the communication system defined in 3GPP, the UE 21 can select and connect a safe gNB based on list information stored in advance. In addition, the list information held by the UE 21 is updated to the latest information in the first Registration process and the Registration process after movement. Thereby, since UE21 can select gNB based on the newest list information, it can improve safety.

(Modification of Embodiment 2)
Subsequently, a modification of the second embodiment will be described with reference to FIG. FIG. 4 shows Registration processing that is executed periodically or periodically. The Registration process that is executed periodically or periodically is, for example, a Registration process that is executed after a predetermined period has elapsed after the Registration process shown in FIG. 2 is first executed.

First, the UE 21 transmits a Registration update request message to the gNB 31 (S31). For example, the cycle in which the UE 21 transmits the Registration / update / request message may be determined in advance. Steps S32 and S33 are the same as steps S21 and S22 of FIG.

As described above, the UE can select and connect a safe gNB even in the registration process that is periodically or periodically executed.

Subsequently, configuration examples of the communication terminal 10 and the AMF 23 described in the above-described plurality of embodiments will be described below with reference to FIGS. 5 and 6.

FIG. 5 is a block diagram illustrating a configuration example of the communication terminal 10. The Radio-Frequency (RF) transceiver 1101 performs analog RF signal processing in order to communicate with the eNB or gNB. Analog RF signal processing performed by the RF transceiver 1101 includes frequency up-conversion, frequency down-conversion, and amplification. RF transceiver 1101 is coupled with antenna 1102 and baseband processor 1103. That is, the RF transceiver 1101 receives modulation symbol data from the baseband processor 1103, generates a transmission RF signal, and supplies the transmission RF signal to the antenna 1102. The modulation symbol data may be OFDM (Orthogonal Frequency Division Multiplexing) symbol data. Further, the RF transceiver 1101 generates a baseband received signal based on the received RF signal received by the antenna 1102 and supplies this to the baseband processor 1103.

The baseband processor 1103 performs digital baseband signal processing (data plane processing) and control plane processing for wireless communication. Digital baseband signal processing includes (a) data compression / decompression, (b) data segmentation / concatenation, and (c) transmission format (transmission frame) generation / decomposition. Further, the digital baseband signal processing includes (d) transmission path encoding / decoding. Further, the digital baseband signal processing includes (e) modulation (symbol mapping) / demodulation and (f) Inverse Fast Fourier Transform (IFFT) generation of OFDM symbol data (baseband OFDM signal). On the other hand, the control plane processing includes communication management of layer 1 (e.g., transmission power control), layer 2 (e.g., wireless resource management, and hybrid automatic return request (HARQ) processing). Further, the control plane processing includes communication management of layer 3 (e.g., signaling related to attach, mobility, and call management).

For example, in the case of LTE and LTE-Advanced, the digital baseband signal processing by the baseband processor 1103 may include a Packet Data Convergence Protocol (PDCP) layer. Further, the digital baseband signal processing may include radio link control (RLC) layer, MAC layer, and PHY layer signal processing. Further, the control plane processing by the baseband processor 1103 may include Non-Access Stratum (NAS) protocol, RRC protocol, and MAC 処理 CE processing.

The baseband processor 1103 may include a modem processor (e.g., “Digital Signal Processor (DSP)) that performs digital baseband signal processing. Further, the baseband processor 1103 may include a protocol stack processor that performs control plane processing. The protocol stack processor may be, for example, Central Processing Unit (CPU) or Micro Processing Unit (MPU). In this case, a protocol stack processor that performs control plane processing may be shared with an application processor 1104 described later.

The application processor 1104 is also called a CPU, MPU, microprocessor, or processor core. The application processor 1104 may include a plurality of processors (a plurality of processor cores). The application processor 1104 executes a system software program (Operating System (OS)) read from the memory 1106 or a memory (not shown). Furthermore, the application processor implements various functions of the communication terminal 10 by executing various application programs. The application program may be, for example, a call application, a web browser, a mailer, a camera operation application, or a music playback application.

In some implementations, the baseband processor 1103 and the application processor 1104 may be integrated on a single chip, as indicated by the dashed line (1105) in FIG. In other words, the baseband processor 1103 and the application processor 1104 may be implemented as one System on Chip (SoC) device 1105. An SoC device is sometimes called a system Large Scale Integration (LSI) or chipset.

The memory 1106 is a volatile memory, a nonvolatile memory, or a combination thereof. The memory 1106 may include a plurality of physically independent memory devices. The volatile memory is, for example, Static Random Access Memory (SRAM), Dynamic RAM (DRAM), or a combination thereof. The nonvolatile memory is a mask Read Only Memory (MROM), Electrically Erasable Programmable ROM (EEPROM), flash memory, or hard disk drive. Or a non-volatile memory is any combination of these. For example, the memory 1106 may include an external memory device accessible from the baseband processor 1103, the application processor 1104, and the SoC 1105. Memory 1106 may include an embedded memory device integrated within baseband processor 1103, application processor 1104, or SoC 1105. Further, the memory 1106 may include a memory in a Universal Integrated Circuit Card (UICC).

The memory 1106 may store a software module (computer program) including an instruction group and data for performing processing by the communication terminal 10 described in the above embodiments. In some implementations, the baseband processor 1103 or the application processor 1104 may be configured to perform the processing of the communication terminal 10 described in the above-described embodiment by reading the software module from the memory 1106 and executing the software module. Good.

FIG. 6 is a block diagram illustrating a configuration example of the AMF 23. Referring to FIG. 6, the AMF 23 includes a network interface 1201, a processor 1202, and a memory 1203. The network interface 1201 is used to communicate with other network node devices constituting the communication system. The network interface 1201 may include, for example, a network interface card (NIC) compliant with IEEE 802.3 series.

The processor 1202 reads the software (computer program) from the memory 1203 and executes it, thereby performing the processing of the AMF 23 described using the sequence diagram in the above-described embodiment. The processor 1202 may be, for example, a microprocessor, an MPU (Micro Processing Unit), or a CPU (Central Processing Unit). The processor 1202 may include a plurality of processors.

The memory 1203 is configured by a combination of a volatile memory and a nonvolatile memory. Memory 1203 may include storage located remotely from processor 1202. In this case, the processor 1202 may access the memory 1203 via an I / O interface not shown.

In the example of FIG. 6, the memory 1203 is used to store software module groups. The processor 1202 can perform the processing of the AMF 23 described in the above embodiment by reading these software module groups from the memory 1203 and executing them.

As described with reference to FIG. 6, each of the processors included in the AMF 23 executes one or a plurality of programs including a group of instructions for causing a computer to execute the algorithm described with reference to the drawings.

In the above example, the program can be stored using various types of non-transitory computer-readable media and supplied to a computer. Non-transitory computer readable media include various types of tangible storage media (tangible storage medium). Examples of non-transitory computer readable media include magnetic recording media (eg, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg, magneto-optical disks). Furthermore, examples of non-transitory computer-readable media include CD-ROM (Read Only Memory), CD-R, and CD-R / W. Further examples of non-transitory computer readable media include semiconductor memory. The semiconductor memory includes, for example, a mask ROM, a PROM (Programmable ROM), an EPROM (Erasable ROM), a flash ROM, and a RAM (Random Access Memory). The program may also be supplied to the computer by various types of temporary computer-readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

In addition, this indication is not restricted to the said embodiment, It can change suitably in the range which does not deviate from the meaning. In addition, the present disclosure may be implemented by appropriately combining the respective embodiments.

The present invention has been described above with reference to the embodiment, but the present invention is not limited to the above. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the invention.

This application claims priority based on Indian application 201711003073 filed on January 27, 2017, the entire disclosure of which is incorporated herein.

A part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.
(Appendix 1)
A storage unit that stores list information indicating information about connectable base stations or areas that can be connected to the base station;
A determination unit that determines whether it is possible to connect to a base station that is a connection destination candidate based on the list information;
A communication terminal comprising: a communication unit configured to receive the latest list information from a core network device via a connected base station after connecting to the connection destination candidate base station.
(Appendix 2)
The determination unit
The communication terminal according to appendix 1, wherein it is determined whether or not it is possible to connect to the base station that is the connection destination candidate when performing the location registration process.
(Appendix 3)
The determination unit
The communication terminal according to appendix 1 or 2, wherein it is determined whether or not it is possible to connect to a handover destination base station.
(Appendix 4)
The communication unit is
Receiving a network slice ID, which is identification information of a network slice that can be used via the connection destination candidate base station, from the connection destination candidate base station, and transmitting the network slice ID to the core network device; The communication terminal according to any one of appendices 1 to 3.
(Appendix 5)
The determination unit
The communication terminal according to any one of appendices 1 to 4, wherein the latest list information is received via a NAS (Network Access Stratum) in which security is ensured.
(Appendix 6)
Information related to the area that can be connected to the base station, included in the list information,
The communication terminal according to any one of appendices 1 to 5, wherein at least one of TA (Tracking Area) and Cell ID is indicated.
(Appendix 7)
Based on the list information indicating the base station that can be connected or the area that can be connected to the base station, determine whether or not it is possible to connect to the base station that is the connection destination candidate,
An information management method for receiving the latest list information from a core network device via a connected base station after connecting to a base station as a connection destination candidate.
(Appendix 8)
Based on the list information indicating the base station that can be connected or the area that can be connected to the base station, determine whether or not it is possible to connect to the base station that is the connection destination candidate,
A program that causes a computer to receive the latest list information from a core network device via a connected base station after connecting to the base station that is the connection destination candidate.

DESCRIPTION OF SYMBOLS 10 Communication terminal 11 Storage part 12 Determination part 13 Communication part 21 UE
22 gNB
23 AMF
24 AUSF
25 UDM
31 gNB

Claims

A storage unit that stores list information indicating information about connectable base stations or areas that can be connected to the base station;
A determination unit that determines whether it is possible to connect to a base station that is a connection destination candidate based on the list information;
A communication terminal comprising: a communication unit that receives the latest list information from a core network device via the connected base station after connecting to the connection destination candidate base station.
The determination unit
The communication terminal according to claim 1, wherein when performing location registration processing, it is determined whether or not it is possible to connect to the base station that is the connection destination candidate.
The determination unit
The communication terminal according to claim 1, wherein it is determined whether or not connection to a handover destination base station is possible.
The communication unit is
Receiving a network slice ID, which is identification information of a network slice that can be used via the connection destination candidate base station, from the connection destination candidate base station, and transmitting the network slice ID to the core network device; The communication terminal according to any one of claims 1 to 3.
The determination unit
The communication terminal according to any one of claims 1 to 4, wherein the latest list information is received via a NAS (Network Access Stratum) in which security is ensured.
Information related to the area that can be connected to the base station, included in the list information,
The communication terminal according to any one of claims 1 to 5, wherein at least one of a TA (Tracking Area) and a cell (Cell) ID is indicated.
Based on the list information indicating the base station that can be connected or the area that can be connected to the base station, determine whether or not it is possible to connect to the base station that is the connection destination candidate,
An information management method for receiving the latest list information from a core network device via the connected base station after connecting to the connection destination candidate base station.
Based on the list information indicating the base station that can be connected or the area that can be connected to the base station, determine whether or not it is possible to connect to the base station that is the connection destination candidate,
A non-temporary program storing a program for causing a computer to receive the latest list information from a core network device via the connected base station after connecting to the connection destination candidate base station. Computer readable medium.