PLMN list providing system, PLMN list providing method, and PLMN list providing program

Abstract

We provide technology that increases the number of PLMNs that UE can connect to during disasters. [Solution] The PLMN list providing system comprises a creating means for creating a disaster PLMN list that includes at least one of a second PLMN provided by a second communication carrier different from a first communication carrier that provides a first PLMN to which a UE connects via a cellular communication method, and a disaster PLMN that has been added for disaster use, and a providing means for providing the disaster PLMN list to the UE via a communication method different from the cellular communication method when the UE is unable to connect to the first PLMN via the cellular communication method.

Description

[Technical Field]

[0001] The present disclosure relates to a PLMN list providing system, a PLMN list providing method, and a PLMN list providing program. [Background technology]

[0002] There is known a technology for providing a terminal with a list of public land mobile networks (PLMNs) via wireless communication. For example, Patent Document 1 discloses a system in which a server of a wireless operator creates a roaming list based on a user's roaming plan and transmits the roaming list to a user's wireless device. The roaming list includes the PLMN list. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2019-520750 Summary of the Invention [Problem to be solved by the invention]

[0004] A terminal connecting to a mobile communication network typically obtains a PLMN list provided by the contracted communication carrier that has a communication contract with the terminal owner. The terminal selects one PLMN from the contracted communication carrier's PLMN list and connects to the selected PLMN.

[0005] However, if the telecommunications facilities owned by the contracted communication carrier are damaged by a disaster, the terminal will not be able to connect to a PLMN included in the contracted communication carrier's PLMN list.

[0006] The present disclosure has been made in view of the above-mentioned problems, and an exemplary purpose thereof is to provide a technology that increases the options for PLMNs to which a UE can connect in the event of a disaster. [Means for solving the problem]

[0007] A PLMN list providing system according to an exemplary aspect of the present disclosure is a system for providing a PLMN list that lists public land mobile networks (PLMNs) to a UE (User Equipment), and includes: a creation means for creating a disaster PLMN list that includes at least one of a second PLMN provided by a second communication carrier different from a first communication carrier that provides a first PLMN to which the UE connects via a cellular communication method, and a disaster PLMN that has been added for disaster use; and a providing means for providing the disaster PLMN list to the UE via a communication method different from the cellular communication method when the UE is unable to connect to the first PLMN via the cellular communication method.

[0008] A PLMN list providing method according to an exemplary aspect of the present disclosure is a method executed by a PLMN list providing system for providing a PLMN list that lists public land mobile networks (PLMNs) to a UE (User Equipment), and includes a creation process for creating a disaster PLMN list that includes at least one of a second PLMN provided by a second communication carrier different from a first communication carrier that provides a first PLMN to which the UE connects via a cellular communication method, and a disaster PLMN that has been added for disaster use, and a provision process for providing the disaster PLMN list to the UE via a communication method different from the cellular communication method when the UE is unable to connect to the first PLMN via the cellular communication method.

[0009] A PLMN list providing program according to an exemplary aspect of the present disclosure is a program that causes at least one processor to function as a PLMN list providing system for providing a PLMN list that lists public land mobile networks (PLMNs) to a UE (User Equipment), and the at least one processor includes: a creating means for creating a disaster PLMN list that includes at least one of a second PLMN provided by a second communication carrier that is different from a first communication carrier that provides a first PLMN to which the UE connects via a cellular communication method, and a disaster PLMN that is added for use in a disaster; and a providing means for providing the disaster PLMN list to the UE via a communication method different from the cellular communication method when the UE is unable to connect to the first PLMN via the cellular communication method. Function as. [Effects of the Invention]

[0010] According to an exemplary aspect of the present disclosure, an exemplary effect is provided in that a technology can be provided that increases the options for connectable PLMNs in the event of a disaster. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a block diagram illustrating a configuration of a PLMN list providing system according to the present disclosure. [Figure 2] 1 is a flow diagram showing the flow of a PLMN list providing method according to the present disclosure. [Figure 3] 1 is a block diagram illustrating a configuration of a PLMN list providing system according to the present disclosure. [Figure 4] 1 is a flow diagram showing the flow of a PLMN list providing method according to the present disclosure. [Figure 5] 1 is a block diagram illustrating a configuration of a PLMN list providing system according to the present disclosure. [Figure 6] 1 is a flow diagram showing the flow of a PLMN list providing method according to the present disclosure. [Figure 7]FIG. 1 is a block diagram illustrating the configuration of a computer that functions as a PLMN list providing system according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0012] The following are examples of embodiments of the present invention. However, the present invention is not limited to the exemplary embodiments shown below, and various modifications are possible within the scope of the claims. For example, embodiments obtained by appropriately combining the technologies (part or all of the products or methods) employed in the exemplary embodiments shown below may also be included in the scope of the present invention. Furthermore, embodiments obtained by appropriately omitting some of the technologies employed in the exemplary embodiments shown below may also be included in the scope of the present invention. Furthermore, the effects mentioned in the exemplary embodiments shown below are examples of effects expected in the exemplary embodiments, and do not define the scope of the present invention. In other words, embodiments that do not exhibit the effects mentioned in the exemplary embodiments shown below may also be included in the scope of the present invention.

[0013] First Exemplary Embodiment A first exemplary embodiment, which is an example of an embodiment of the present invention, will be described in detail with reference to the drawings. This exemplary embodiment is the basic form of each exemplary embodiment described later. The scope of application of each technology employed in this exemplary embodiment is not limited to this exemplary embodiment. That is, each technology employed in this exemplary embodiment can also be employed in other exemplary embodiments included in the present disclosure, to the extent that no particular technical obstacles arise. Furthermore, each technology shown in the drawings referenced to explain this exemplary embodiment can also be employed in other exemplary embodiments included in the present disclosure, to the extent that no particular technical obstacles arise.

[0014] (Configuration of PLMN list providing system 1) The configuration of the PLMN list providing system 1 will be described with reference to Fig. 1. Fig. 1 is a block diagram showing the configuration of the PLMN list providing system 1. The PLMN list providing system 1 is a system for providing a PLMN list that lists public land mobile networks (PLMNs) to a UE (User Equipment).

[0015] 1, the PLMN list providing system 1 includes a creating unit 11 and a providing unit 12. The creating unit 11 and the providing unit 12 are an example of a configuration that realizes creating means and providing means. For example, if the PLMN list providing system 1 includes at least one processor, the creating unit 11 and the providing unit 12 are realized by the at least one processor executing a program.

[0016] Creation unit 11 creates a disaster PLMN list. The disaster PLMN list includes at least one of a second PLMN provided by a second communication carrier different from a first communication carrier that provides a first PLMN to which the UE connects via a cellular communication method, and a disaster PLMN added for use in disaster situations. When the UE cannot connect to the first PLMN provided by the first communication carrier via the cellular communication method, provision unit 12 provides the disaster PLMN list to the UE via a communication method different from the cellular communication method.

[0017] The first communication carrier is a carrier that has a communication contract with the owner of the UE. Normally, the UE acquires a first PLMN list created by the first communication carrier. The UE connects to one first PLMN selected from the first PLMN list via a cellular communication method. The first PLMN list includes a Home PLMN (HPLMN) and / or a Visited PLMN (VPLMN) provided by the first communication carrier. The first PLMN provided by the first communication carrier includes the HPLMN and VPLMN provided by the first communication carrier.

[0018] The second carrier is a carrier that does not have a communications contract with the owner of the UE. Under normal circumstances, the UE does not connect to a second PLMN provided by the second carrier. The second PLMN provided by the second carrier includes the HPLMN and VPLMN provided by the second carrier.

[0019] The disaster PLMN may be a PLMN added by a government agency. The disaster PLMN may be a PLMN added by a first communication carrier or a second communication carrier. The disaster PLMN may also be a PLMN added by a communication carrier different from the first communication carrier and the second communication carrier.

[0020] The providing unit 12 provides the disaster PLMN list to UEs that connect to the Internet by a communication method other than the cellular communication method. The communication method other than the cellular communication method includes, for example, a Wi-Fi (registered trademark) communication method, a wired communication method, etc.

[0021] (Flow of PLMN list provision method S1) The flow of the PLMN list providing method S1 will be described with reference to Fig. 2. Fig. 2 is a flow diagram showing the flow of the PLMN list providing method S1. As shown in Fig. 2, the PLMN list providing method S1 includes a creation process S11 and a provision process S12.

[0022] In a creation process S11, at least one processor (for example, creation unit 11) creates a disaster PLMN list. In a provision process S12, at least one processor (for example, provision unit 12) provides the disaster PLMN list to the UE by a communication method different from the cellular communication method when the UE cannot connect to a first PLMN provided by a first communication carrier by the cellular communication method.

[0023] (Effects of PLMN list providing system 1 and PLMN list providing method S1) As described above, PLMN list providing system 1 and PLMN list providing method S1 are configured such that providing unit 12 provides the disaster PLMN list created by creation unit 11 to the UE via a communication method different from the cellular communication method. Even if the UE cannot connect to the first PLMN, it can connect to a second PLMN included in the disaster PLMN or to a disaster PLMN. Therefore, PLMN list providing system 1 and PLMN list providing method S1 can increase the options of PLMNs to which the UE can connect in the event of a disaster.

[0024] Second Exemplary Embodiment A second exemplary embodiment, which is one example of an embodiment of the present invention, will be described in detail with reference to the drawings. Components having the same functions as those described in the above exemplary embodiment will be assigned the same reference numerals, and their description will be omitted as appropriate. The scope of application of each technology employed in this exemplary embodiment is not limited to this exemplary embodiment. That is, each technology employed in this exemplary embodiment can also be employed in other exemplary embodiments included in the present disclosure, to the extent that no particular technical hindrance occurs. Furthermore, each technology shown in each drawing referenced to explain this exemplary embodiment can also be employed in other exemplary embodiments included in the present disclosure, to the extent that no particular technical hindrance occurs.

[0025] (Configuration of PLMN list providing system) The configuration of the PLMN list providing system 1A will be described with reference to Fig. 3. Fig. 3 is a block diagram showing the configuration of the PLMN list providing system 1A. As shown in Fig. 3, the PLMN list providing system 1A includes a first communication carrier 2, a second communication carrier 3, a centralized management system 5, and a UE 6.

[0026] The first communication carrier 2 is a carrier that has a communication contract with the owner of the UE 6. The first communication carrier 2 provides a first HPLMN 200 and a first VPLMN 210. The first HPLMN 200 and the first VPLMN 210 are first PLMNs provided by the first communication carrier 2. In the following description, when simply referring to a "first PLMN," this includes the first HPLMN 200 and the first VPLMN 210.

[0027] The first HPLMN 200 includes a 5GC 201 to which a gNB 202 is connected. The first VPLMN 210 includes a 5GC 211 to which a gNB 212 is connected. The gNB 202 and the gNB 212 are base stations that constitute a 5G Radio Access Network (5G-RAN). The gNB 202 and the gNB 212 constitute a cell of a cellular communication system.

[0028] 5GC201 and 5GC211 include the following network functions (NFs): AMF (Access and Mobility management Function), SMF (Session Management Function), UDM (Unified Data Management), UPF (User Plane Function), and NWDAF (Network Data Analytics Function). The AMF, SMF, UDM, and NWDAF function as a C-Plane (Control Plane) for communicating control signals. The UPF functions as a U-Plane (User Plane) for communicating user data.

[0029] The AMF manages UE registration, connection, mobility, etc. The SMF manages UE sessions, etc. The UDM holds various data such as subscriber data and UE location information. The NWDAF collects PLMN load information. For example, the NWDAF of 5GC201 collects load information of the first HPLMN200. Examples of PLMN load information include (i) CPU (Central Processing Unit) usage in the entire PLMN, (ii) memory usage in the entire first HPLMN200, (iii) number of sessions, and (iv) bandwidth usage. Note that 5GC201 and 5GC211 may include NFs such as UDR (Unified Data Repository), AUSF (Authentication Server Function), and NSSF (Network Slice Selection Function).

[0030] The first communication carrier 2 includes a first resource confirmation system 20. The first resource confirmation system 20 provides the created first PLMN list L1 to the centralized management system 5. The first resource confirmation system 20 may determine connection priorities of PLMNs included in the first PLMN list L1 based on the resources of the first HPLMN 200 and the first VPLMN 210. The first resource confirmation system 20 includes a first load information acquisition unit 21, a first priority determination unit 22, a first creation unit 23, a first provision unit 24, and a first storage unit 25.

[0031] The first load information acquisition unit 21 acquires load information of the first PLMN from the first PLMN. More specifically, the first load information acquisition unit 21 acquires load information of the first HPLMN 200 and load information of the first VPLMN 210 from the NWDAF of the 5GC 201 and the NWDAF of the 5GC 211, respectively.

[0032] The first priority determination unit 22 determines a connection priority for each of the first HPLMN 200 and the first VPLMN 210 included in the first PLMN list L1. The first priority determination unit 22 may determine the connection priority based on the acquired load information of the first PLMN.

[0033] The first creation unit 23 creates a first PLMN list L1 that lists first PLMNs provided by the first communication carrier 2. The first PLMN list L1 includes a first HPLMN 200 and a first VPLMN 210. The first creation unit 23 stores the created first PLMN list L1 in the first storage unit 25.

[0034] The first providing unit 24 provides the first PLMN list L1 to the centralized management system 5 via a network such as the Internet. The first providing unit 24 may also provide load information of the first PLMN to the centralized management system 5.

[0035] The second communication carrier 3 is a carrier that does not have a communication contract with the owner of the UE 6. The second communication carrier 3 provides a second HPLMN 300 and a second VPLMN 310. The second HPLMN 300 and the second VPLMN 310 are second PLMNs provided by the second communication carrier 3. In the following description, when simply referring to a "second PLMN," this includes the second HPLMN 300 and the second VPLMN 310.

[0036] The second HPLMN 300 includes a 5GC 301 to which a gNB 302 is connected. The second VPLMN 310 includes a 5GC 311 to which a gNB 312 is connected. The gNB 302 and the gNB 312 are base stations that make up a 5G-RAN. The gNB 302 and the gNB 312 make up a cell of a cellular communication system.

[0037] 5GC301 and 5GC311 include AMF, SMF, UDM, UPF, and NWDAF as NFs. Note that 5GC301 and 5GC311 may also include UDR, AUSF, NSSF, etc. as NFs.

[0038] The second communication carrier 3 includes a second resource confirmation system 30. The second resource confirmation system 30 provides the created second PLMN list L2 to the centralized management system 5. The second resource confirmation system 30 may determine connection priorities of PLMNs included in the second PLMN list L2 based on the resources of the second HPLMN 300 and the second VPLMN 310. The second resource confirmation system 30 includes a second load information acquisition unit 31, a second priority determination unit 32, a second creation unit 33, a second provision unit 34, and a second storage unit 35.

[0039] The second load information acquisition unit 31 acquires load information of the second PLMN from the second PLMN. More specifically, the second load information acquisition unit 31 acquires load information of the second HPLMN 300 and load information of the second VPLMN 310 from the NWDAF of 5GC 301 and the NWDAF of 5GC 311, respectively.

[0040] The second priority determination unit 32 determines a connection priority for each of the second HPLMN 300 and the second VPLMN 310 included in the second PLMN list L2. The second priority determination unit 32 may determine the connection priority based on the acquired load information of the second PLMN.

[0041] The second creation unit 33 creates a second PLMN list L2 that lists second PLMNs provided by the second communication carrier 3. The second PLMN list L2 includes a second HPLMN 300 and a second VPLMN 310. The second creation unit 33 stores the created second PLMN list L2 in the second storage unit 35.

[0042] The second providing unit 34 provides the second PLMN list L2 to the centralized management system 5 via a network such as the Internet. The second providing unit 34 may also provide load information of the second PLMN to the centralized management system 5.

[0043] The centralized management system 5 is a system that manages the disaster PLMN list DL. The centralized management system 5 is owned by a government agency or a communication carrier different from the first communication carrier 2 and the second communication carrier 3. The centralized management system 5 acquires the first PLMN list L1 and the second PLMN list L2 from the first communication carrier 2 and the second communication carrier 3, respectively. The centralized management system 5 creates the disaster PLMN list DL based on the acquired first PLMN list L1 and second PLMN list L2. The centralized management system 5 publishes the created disaster PLMN list DL on the Internet. The centralized management system 5 provides the disaster PLMN list DL to UEs 6 connected to the Internet 8 using access points 7.

[0044] The unified management system 5 includes a list acquisition unit 51, a third priority determination unit 52, a third creation unit 53, a third provision unit 54, and a third storage unit 55.

[0045] The list acquisition unit 51 acquires a first PLMN list L1 and a second PLMN list L2 from the first communication carrier 2 and the second communication carrier 3, respectively. In the second exemplary embodiment, the list acquisition unit 51 is an example of a configuration that realizes a list acquisition means. The list acquisition unit 51 may acquire load information of the first PLMN and load information of the second PLMN from the first communication carrier 2 and the second communication carrier 3, respectively. The list acquisition unit 51 may periodically acquire each of the PLMN lists L1 and L2 and / or acquire the load information of each PLMN.

[0046] The third priority determination unit 52 determines a connection priority for each PLMN included in the disaster PLMN list DL. In the second exemplary embodiment, the third priority determination unit 52 is an example of a configuration realizing a priority determination means. Specifically, the third priority determination unit 52 determines a connection priority for each of the first HPLMN 200, the first VPLMN 210, the second HPLMN 300, and the second VPLMN 310 included in the disaster PLMN list DL. The third priority determination unit 52 may determine the priority based on PLMN load information acquired for each PLMN included in the disaster PLMN list DL. The third priority determination unit 52 may determine the connection priority based on the business scale of the communication carrier, etc.

[0047] The third creation unit 53 creates a disaster PLMN list DL. In the second exemplary embodiment, the third creation unit 53 is an example of a configuration realizing creation means. The third creation unit 53 may create the disaster PLMN list DL based on the first PLMN list L1 and the second PLMN list L2. The disaster PLMN list DL includes a first HPLMN 200, a first VPLMN 210, a second HPLMN 300, and a second VPLMN 310. The disaster PLMN list DL may include a disaster PLMN added for disaster use. The third creation unit 53 stores the created disaster PLMN list DL in the third storage unit 55.

[0048] The third providing unit 54 provides the disaster PLMN list DL to the UE via a communication method different from the cellular communication method. In the second exemplary embodiment, the third providing unit 54 is an example of a configuration realizing a providing means. The third providing unit 54 provides the disaster PLMN list DL to the UE 6 connected to the Internet 8 using the access point 7.

[0049] The UE 6 is a device that can connect to a network wirelessly or wired. Examples of the UE 6 include a smartphone and a tablet terminal. The UE 6 connects to a mobile communication network. The UE 6 can access the Internet 8 by connecting to a PLMN via a cellular communication method. Under normal circumstances, the UE 6 obtains a first PLMN list L1 provided by the first communication carrier 2. The UE 6 selects a first PLMN to connect to based on the first PLMN list L1.

[0050] The UE 6 may be able to connect to the Internet 8 via a Wi-Fi communication method. The UE 6 may be able to connect to the Internet 8 using a Wi-Fi access point 7. The UE 6 can connect to the Internet 8 via the Wi-Fi communication method even if it is unable to connect to the first PLMN of the first communication carrier via the cellular communication method.

[0051] The UE 6 includes a UE providing unit 61 and a UE acquiring unit 62. The UE providing unit 61 provides various information. The UE providing unit 61 provides a request to acquire the disaster PLMN list DL to the centralized management system 5. The UE acquiring unit 62 acquires various information. The UE acquiring unit 62 acquires the disaster PLMN list DL from the centralized management system 5. More specifically, the UE 6 connected to the Internet 8 using the access point 7 accesses the centralized management system 5. The UE acquiring unit 62 of the UE 6 that has accessed the centralized management system 5 acquires the disaster PLMN list DL from the centralized management system 5.

[0052] (Flow of PLMN list provision method S1A) The PLMN list providing system 1A configured as described above executes a PLMN list providing method S1A. The flow of the PLMN list providing method S1A will be described with reference to Fig. 4. Fig. 4 is a flow diagram showing the flow of the PLMN list providing method S1A.

[0053] 4, in step S101, the list acquisition unit 51 of the unified management system 5 requests the first resource confirmation system 20 to acquire a first PLMN list L1. In step S102, the list acquisition unit 51 requests the second resource confirmation system 30 to acquire a second PLMN list L2.

[0054] In step S103, the first providing unit 24 of the first resource confirmation system 20 provides the first PLMN list L1 to the centralized management system 5. In step S103, the list acquiring unit 51 acquires the first PLMN list L1. In step S104, the second providing unit 34 of the second resource confirmation system 30 provides the second PLMN list L2 to the list acquiring unit 51. In step S104, the list acquiring unit 51 acquires the second PLMN list L2.

[0055] In step S105, the third creation unit 53 creates a disaster PLMN list DL based on the acquired first PLMN list L1 and second PLMN list L2. Step S105 is an example of the creation process. In step S105, the third creation unit 53 associates each PLMN included in the disaster PLMN list DL with a connection priority determined by the third priority determination unit 52. In step S105, the third creation unit 53 stores the created disaster PLMN list DL in the third storage unit 55.

[0056] In step S106, the first HPLMN 200 is damaged by the occurrence of a disaster. In step S107, the UE provision unit 61 provides a registration request for the first HPLMN 200 to the AMF 203 included in the 5GC 201 of the first HPLMN 200. In step S108, the UE 6 cannot connect to the first HPLMN 200 because the first HPLMN 200 is damaged by the disaster. In other words, the UE 6 cannot connect to the first PLMN using the cellular communication method.

[0057] In step S109, the UE providing unit 61 provides a request to acquire the disaster PLMN list DL to the centralized management system 5. In step S109, the UE 6 can connect to the Internet 8 using the access point 7, and therefore accesses the centralized management system 5 via the Internet 8.

[0058] In step S110, the third providing unit 54 provides the disaster PLMN list DL to the UE 6 via the Internet 8. Step S110 is an example of a providing process. In step S110, the UE acquiring unit 62 acquires the disaster PLMN list DL via the Internet 8.

[0059] In step S111, the UE providing unit 61 provides a registration request for the second HPLMN 300 to the AMF 303 included in the 5GC 301 of the second HPLMN 300. In step S111, the UE 6 provides the registration request for the PLMN in accordance with the acquired disaster PLMN list DL. In step S112, when the AMF 303 permits the registration of the UE 6, it notifies the UE 6 of the acceptance of the registration.

[0060] (Effects of PLMN List Provision System 1A) As described above, the PLMN list providing system 1A employs a configuration in which, when the UE 6 cannot connect to the first PLMN via the cellular communication system, the third providing unit 54 provides the disaster PLMN list DL to the UE 6. This allows for the same effects as those of the PLMN list providing system 1 to be obtained.

[0061] Furthermore, PLMN list providing system 1A employs a configuration in which third creation unit 53 creates disaster PLMN list DL based on first PLMN list L1 and second PLMN list L2. Disaster PLMN list DL includes a second PLMN provided by second communication carrier 3 with which the owner of UE 6 does not have a communications contract. Therefore, in addition to the effects of PLMN list providing system 1, PLMN list providing system 1A provides the effect that UE 6 can connect to a second PLMN provided by second communication carrier 3 with which the owner of UE 6 does not have a communications contract.

[0062] Furthermore, the PLMN list providing system 1A is configured such that the list acquiring unit 51 acquires the first PLMN list L1 and the second PLMN list L2. Therefore, in addition to the effects of the PLMN list providing system 1, the PLMN list providing system 1A has the effect of being able to include PLMNs provided by multiple communication carriers in the disaster PLMN list DL.

[0063] As described above, the PLMN list providing system 1A employs a configuration in which the third priority determination unit 52 determines the connection priority for each PLMN included in the disaster PLMN list DL. Therefore, in addition to the effects of the PLMN list providing system 1, the PLMN list providing system 1A also provides the effect of shortening the time required for UE 6 to connect to a PLMN.

[0064] Furthermore, the PLMN list providing system 1A employs a configuration in which the third priority determining unit 52 determines the priority based on the PLMN load information acquired for each PLMN included in the disaster PLMN list DL. Therefore, in addition to the effects of the PLMN list providing system 1, the PLMN list providing system 1A has the effect of being able to update the connection priority for each PLMN included in the disaster PLMN list DL based on the load status of each PLMN in the disaster PLMN list DL.

[0065] Furthermore, the PLMN list provision system 1A employs a configuration in which the disaster PLMN list DL is created by the centralized management system 5. Therefore, in addition to the effects of the PLMN list provision system 1, the PLMN list provision system 1A also provides the effect of being able to centrally provide the disaster PLMN list DL.

[0066] [Variation 1] The configuration of PLMN list providing system 1B, which is a modification of PLMN list providing system 1A, will be described with reference to Fig. 5. Fig. 5 is a block diagram showing the configuration of PLMN list providing system 1B. PLMN list providing system 1B includes a first communication carrier 2, a second communication carrier 3, and a UE 6. Below, differences from PLMN list providing system 1A will be described, and similar points will not be described repeatedly.

[0067] 5, in the PLMN list providing system 1B, the first communication carrier 2 and the second communication carrier 3 respectively create a first disaster PLMN list DL1 and a second disaster PLMN list DL2. The first communication carrier 2 and the second communication carrier 3 respectively publish the created first disaster PLMN list DL1 and second disaster PLMN list DL2 on the Internet.

[0068] The first communication carrier 2 may add a first disaster VPLMN 220 for use in disasters. The first disaster VPLMN 220 is a disaster PLMN. The first disaster VPLMN 220 includes a 5GC 221 to which a gNB 222 is connected. The 5GC 221 has the same configuration as the 5GC 201. The gNB 222 is a base station that constitutes a 5G-RAN. The gNB 222 constitutes a cell of a cellular communication system.

[0069] The first load information acquisition unit 21 may acquire load information of the first disaster VPLMN 220 from the NWDAF of the 5GC 221. The first creation unit 23 may create the first disaster PLMN list DL1. In the first modification, the first creation unit 23 is an example of a configuration that realizes creation means. The first disaster PLMN list DL1 includes the first disaster VPLMN 220. The first creation unit 23 stores the created first disaster PLMN list DL1 in the first storage unit 25.

[0070] When UE 6 is unable to connect to the first PLMN provided by the first communication carrier 2 via the cellular communication method, the first providing unit 24 provides the first disaster PLMN list DL1 to UE 6 via a communication method different from the cellular communication method. In Modification 1, the first providing unit 24 is an example of a configuration realizing a providing means. The first providing unit 24 may provide the first disaster PLMN list DL1 to UE 6 connected to the Internet 8 using an access point 7. That is, when UE 6 is unable to connect to the first PLMN via the cellular communication method, UE 6 connects to the Internet 8 using the access point 7. The UE acquiring unit 62 of UE 6 that accesses the first resource confirmation system 20 via the Internet 8 acquires the first disaster PLMN list DL1.

[0071] In addition, the second communication carrier 3 may add a second disaster VPLMN 320 for use in disasters. The second disaster VPLMN 320 is a disaster PLMN. The second disaster VPLMN 320 includes a 5GC 321 to which a gNB 322 is connected. The 5GC 321 has the same configuration as the 5GC 301. The gNB 322 is a base station that constitutes a 5G-RAN. The gNB 322 constitutes a cell of a cellular communication system.

[0072] The second load information acquisition unit 31 may acquire load information of the second disaster VPLMN 320 from the NWDAF of the 5GC 321. The second creation unit 33 may create the second disaster PLMN list DL2. In the first modification, the second creation unit 33 is an example of a configuration that realizes creation means. The second disaster PLMN list DL2 includes the second disaster VPLMN 320. The second creation unit 33 stores the created second disaster PLMN list DL2 in the second storage unit 35.

[0073] When UE 6 is unable to connect to the first PLMN provided by the first communication carrier 2 via the cellular communication method, the second providing unit 34 provides the second disaster PLMN list DL2 to UE 6 via a communication method different from the cellular communication method. In Modification 1, the second providing unit 34 is an example of a configuration realizing a providing means. The second providing unit 34 provides the second disaster PLMN list DL2 to UE 6 that is connected to the Internet 8 using an access point 7. In other words, when UE 6 is unable to connect to the first PLMN of the first communication carrier 2 via the cellular communication method, UE 6 connects to the Internet 8 using the access point 7. The UE acquiring unit 62 accesses the second resource confirmation system 30 via the Internet 8 and acquires the second disaster PLMN list DL2.

[0074] In PLMN list providing system 1B, only first communication carrier 2 may create first disaster PLMN list DL1, and only second communication carrier 3 may create second disaster PLMN list DL2. Also, in PLMN list providing system 1B, only first communication carrier 2 may add first disaster VPLMN 220, and only second communication carrier 3 may add second disaster VPLMN list 320.

[0075] (Flow of PLMN list provision method S1B) The PLMN list providing system 1B configured as described above executes a PLMN list providing method S1B. The flow of the PLMN list providing method S1B will be described with reference to FIG. 6. FIG. 6 is a flow diagram showing the flow of the PLMN list providing method S1B. As shown in FIG. 6, the PLMN list providing method S1B is a flow when the second communication carrier 3 adds a second disaster VPLMN 320. Note that when the first communication carrier 2 adds a first disaster VPLMN 220, the flow is the same as that of the PLMN list providing method S1B.

[0076] 6, steps S201 to S203 of the PLMN list providing method S1B are the same as steps S106 to S108 of the PLMN list providing method S1A, respectively, and therefore will not be described again. In step S204, the second communication carrier 3 adds a second disaster VPLMN 320.

[0077] In step S205, the AMF 323 included in the 5GC 321 of the second disaster VPLMN 320 provides an availability notification to the second resource confirmation system 30. The availability notification is a notification indicating that the second disaster VPLMN 320 is available for use. In step S206, the second creation unit 33 creates a second disaster PLMN list DL2 that includes the second disaster VPLMN 320. Step S206 is an example of the creation process.

[0078] Steps S207 to S210 of the PLMN list providing method S1B are the same as steps S109 to S112 of the PLMN list providing method S1A, respectively, and therefore will not be described again.

[0079] (Effects of PLMN List Provision System 1B) As described above, the PLMN list providing system 1B is configured such that, when the UE 6 is unable to connect to the first PLMN via the cellular communication system, the first providing unit 24 or the second providing unit 34 provides the UE 6 with the first disaster PLMN list DL1 or the second disaster PLMN list DL2. Furthermore, the first priority determining unit 22 determines a connection priority for each PLMN included in the first disaster PLMN list DL1 based on the acquired load information for the first PLMN. Furthermore, the second priority determining unit 32 determines a connection priority for each PLMN included in the second disaster PLMN list DL2 based on the acquired load information for the second PLMN. Therefore, the same effects as those of the second exemplary embodiment can be achieved.

[0080] Furthermore, the PLMN list providing system 1A is configured so that the first disaster PLMN list DL1 or the second disaster PLMN list DL2 is created by the first communication carrier 2 or the second communication carrier 3. Therefore, in addition to the effects of the PLMN list providing system 1, the PLMN list providing system 1A has the effect of enabling the owner of UE 6 to obtain the first disaster PLMN list DL1 or the second disaster PLMN list DL2 by accessing a site of the first communication carrier 2 or the second communication carrier 3 that the owner of UE 6 recognizes.

[0081] [Other Modifications] In the above-described first modification, an example has been described in which the first disaster PLMN list DL1 includes the first disaster VPLMN 220. However, the first disaster PLMN list DL1 may also include at least one of the second HPLMN 300, the second VPLMN 310, and the second disaster VPLMN 320 provided by the second communication carrier 3. In this case, the first resource confirmation system 20 may include a list acquisition unit that acquires a PLMN list that lists PLMNs provided by the second communication carrier 3. Furthermore, the first priority determination unit 22 may determine a connection priority for each PLMN included in the first disaster PLMN list DL1. Furthermore, the first priority determination unit 22 may determine the priority based on PLMN load information acquired for each PLMN included in the first disaster PLMN list DL1. In this case, the first priority determination unit 22 is an example of a configuration that realizes a priority determination means.

[0082] In addition, in the above-described first modification, an example has been described in which the second disaster PLMN list DL2 includes the second disaster VPLMN 320. However, the second disaster PLMN list DL2 may also include at least one of the first HPLMN 200, the first VPLMN 210, and the first disaster VPLMN 220 provided by the first communication carrier 2. In this case, the second resource confirmation system 30 may include a list acquisition unit that acquires a PLMN list that lists PLMNs provided by the first communication carrier 2. The second priority determination unit 32 may determine a connection priority for each PLMN included in the second disaster PLMN list DL2. Furthermore, the second priority determination unit 32 may determine the priority based on PLMN load information acquired for each PLMN included in the second disaster PLMN list DL2. In this case, the second priority determination unit 32 is an example of a configuration that realizes a priority determination means.

[0083] [Software implementation example] Some or all of the functions of the PLMN list providing systems 1, 1A, 1B (hereinafter also referred to as "each of the above devices") may be realized by hardware such as an integrated circuit (IC chip), or by software.

[0084] In the latter case, each of the above devices is realized by, for example, a computer that executes instructions of a program, which is software that realizes each function. An example of such a computer (hereinafter referred to as computer C) is shown in Figure 7. Figure 7 is a block diagram showing the hardware configuration of computer C that functions as each of the above devices.

[0085] The computer C includes at least one processor C1 and at least one memory C2. The memory C2 stores a program P for causing the computer C to operate as each of the above-mentioned devices. In the computer C, the processor C1 reads and executes the program P from the memory C2, thereby realizing the functions of each of the above-mentioned devices.

[0086] The processor C1 may be, for example, a central processing unit (CPU), a graphic processing unit (GPU), a digital signal processor (DSP), a micro processing unit (MPU), a floating point number processing unit (FPU), a physics processing unit (PPU), a tensor processing unit (TPU), a quantum processor, a microcontroller, or a combination thereof. The memory C2 may be, for example, a flash memory, a hard disk drive (HDD), a solid state drive (SSD), or a combination thereof.

[0087] The computer C may further include a RAM (Random Access Memory) for expanding the program P during execution and for temporarily storing various data. The computer C may also include a communication interface for transmitting and receiving data to and from other devices. The computer C may also include an input / output interface for connecting input / output devices such as a keyboard, mouse, display, and printer.

[0088] Furthermore, the program P can be recorded on a non-transitory tangible recording medium M that can be read by the computer C. Such a recording medium M can be, for example, a tape, a disk, a card, a semiconductor memory, or a programmable logic circuit. The computer C can acquire the program P via such a recording medium M. The program P can also be transmitted via a transmission medium. Such a transmission medium can be, for example, a communication network or broadcast waves. The computer C can also acquire the program P via such a transmission medium.

[0089] Furthermore, the functions of each of the devices may be realized by a single processor provided in a single computer, by multiple processors provided in a single computer working in cooperation, or by multiple processors provided in each of multiple computers working in cooperation. Furthermore, the programs for causing each of the devices to realize the functions may be stored in a single memory provided in a single computer, or may be distributed and stored in multiple memories provided in a single computer, or may be distributed and stored in multiple memories provided in each of multiple computers.

[0090] [Appendix A] This disclosure includes the techniques described in the following appendices. However, the present invention is not limited to the techniques described in the following appendices, and various modifications are possible within the scope of the claims.

[0091] (Appendix A1) A system for providing a PLMN list that lists public land mobile networks (PLMNs) to a UE (User Equipment), comprising: a creating means for creating a disaster PLMN list including at least one of a second PLMN provided by a second communication carrier different from a first communication carrier that provides a first PLMN to which the UE is connected by a cellular communication method, and a disaster PLMN that is added for use in a disaster; providing means for providing the disaster PLMN list to the UE by a communication method different from the cellular communication method when the UE cannot connect to the first PLMN by the cellular communication method; PLMN list provision system.

[0092] (Appendix A2) the creation means creates the disaster PLMN list based on a first PLMN list that lists the first PLMNs and a second PLMN list that lists the second PLMNs. 1. A PLMN list providing system as described in Appendix A1.

[0093] (Appendix A3) further comprising a list acquisition means for acquiring the first PLMN list and the second PLMN list from the first communication carrier and the second communication carrier, respectively; 1. A PLMN list providing system as described in Appendix A2.

[0094] (Appendix A4) Further, a priority determination means is provided for determining a connection priority for each PLMN included in the disaster PLMN list. 1. A system for providing a PLMN list according to any one of appendices A1 to A3.

[0095] (Appendix A5) the priority determination means determines the priority based on PLMN load information acquired for each PLMN included in the disaster PLMN list. A PLMN list provision system as described in Appendix A4.

[0096] (Appendix A6) The disaster PLMN list is created by a centralized management system owned by a government agency or a communications carrier different from the first communications carrier and the second communications carrier. 10. A system for providing a PLMN list according to any one of appendices A1 to A5.

[0097] (Appendix A7) The disaster PLMN list is created by the first communication carrier or the second communication carrier. 10. A system for providing a PLMN list according to any one of appendices A1 to A5.

[0098] [Appendix B] This disclosure includes the techniques described in the following appendices. However, the present invention is not limited to the techniques described in the following appendices, and various modifications are possible within the scope of the claims.

[0099] (Appendix B1) 1. A method performed by a PLMN list providing system for providing a PLMN list that lists public land mobile networks (PLMNs) to a UE (User Equipment), comprising: a creation process for creating a disaster PLMN list including at least one of a second PLMN provided by a second communication carrier different from a first communication carrier that provides a first PLMN to which the UE is connected via a cellular communication system, and a disaster PLMN that has been added for use in a disaster; and a providing process for providing the disaster PLMN list to the UE by a communication method different from the cellular communication method when the UE cannot connect to the first PLMN by the cellular communication method. How to provide the PLMN list.

[0100] (Appendix B2) In the creation process, the disaster PLMN list is created based on a first PLMN list that lists the first PLMNs and a second PLMN list that lists the second PLMNs. A method for providing a PLMN list as described in Appendix B1.

[0101] (Appendix B3) and further comprising a list acquisition process for acquiring the first PLMN list and the second PLMN list from the first communication carrier and the second communication carrier, respectively. A method for providing a PLMN list as described in Appendix B2.

[0102] (Appendix B4) Further includes a priority determination process for determining a connection priority for each PLMN included in the disaster PLMN list. 10. A method for providing a PLMN list according to any one of appendices B1 to B3.

[0103] (Appendix B5) In the priority determination process, the priority is determined based on load information of PLMNs acquired for each PLMN included in the disaster PLMN list. The method for providing a PLMN list as described in Appendix B4.

[0104] (Appendix B6) The disaster PLMN list is created by a centralized management system owned by a government agency or a communications carrier different from the first communications carrier and the second communications carrier. 10. A method for providing a PLMN list according to any one of appendices B1 to B5.

[0105] (Appendix B7) The disaster PLMN list is created by the first communication carrier or the second communication carrier. 10. A method for providing a PLMN list according to any one of appendices B1 to B5.

[0106] [Appendix C] This disclosure includes the techniques described in the following appendices. However, the present invention is not limited to the techniques described in the following appendices, and various modifications are possible within the scope of the claims.

[0107] (Appendix C1) A program that causes at least one processor to function as a PLMN list providing system for providing a PLMN list that lists Public Land Mobile Networks (PLMNs) to a UE (User Equipment), comprising: the at least one processor, a creating means for creating a disaster PLMN list including at least one of a second PLMN provided by a second communication carrier different from a first communication carrier that provides a first PLMN to which the UE is connected by a cellular communication method, and a disaster PLMN that is added for use in a disaster; providing means for providing the disaster PLMN list to the UE by a communication method different from the cellular communication method when the UE cannot connect to the first PLMN by the cellular communication method; A PLMN list provider that acts as a

[0108] (Appendix C2) the creation means creates the disaster PLMN list based on a first PLMN list that lists the first PLMNs and a second PLMN list that lists the second PLMNs. 1. The PLMN list providing program described in Appendix C1.

[0109] (Appendix C3) and further causing the at least one processor to function as a list obtaining means for obtaining the first PLMN list and the second PLMN list from the first communication carrier and the second communication carrier, respectively. 1. The PLMN list providing program described in Appendix C2.

[0110] (Appendix C4) and causing the at least one processor to further function as a priority determination means for determining a connection priority for each PLMN included in the disaster PLMN list. 1. The PLMN list providing program of any of Appendixes C1 to C3.

[0111] (Appendix C5) the priority determination means determines the priority based on PLMN load information acquired for each PLMN included in the disaster PLMN list. the PLMN list providing program described in Appendix C4.

[0112] (Appendix C6) The disaster PLMN list is created by a centralized management system owned by a government agency or a communications carrier different from the first communications carrier and the second communications carrier. 1. The PLMN list providing program of any of Appendixes C1 to C5.

[0113] (Appendix C7) The disaster PLMN list is created by the first communication carrier or the second communication carrier. 1. The PLMN list providing program of any of Appendixes C1 to C5.

[0114] [Appendix D] This disclosure includes the techniques described in the following appendices. However, the present invention is not limited to the techniques described in the following appendices, and various modifications are possible within the scope of the claims.

[0115] (Appendix D1) A UE (User Equipment) that acquires a PLMN list that lists public land mobile networks (PLMNs), a UE providing means for, when the UE cannot connect to a first PLMN provided by a first communication carrier by a cellular communication method, providing a disaster PLMN list acquisition request including at least one of a second PLMN provided by a second communication carrier different from the first communication carrier and a disaster PLMN added for use in disasters by a communication method different from the cellular communication method; and a UE acquisition means for acquiring the disaster PLMN list by a communication method different from the cellular communication. UE.

[0116] (Appendix D2) The disaster PLMN list is created based on a first PLMN list that lists the first PLMNs and a second PLMN list that lists the second PLMNs. The UE described in Appendix D1.

[0117] (Appendix D3) The disaster PLMN list determines a connection priority for each PLMN included in the disaster PLMN list. A UE as described in Appendix D1 or D2.

[0118] (Appendix D4) The priority of the disaster PLMN list is determined based on PLMN load information acquired for each PLMN included in the disaster PLMN list. The UE described in Appendix D3.

[0119] (Appendix D5) The disaster PLMN list is created by a centralized management system owned by a government agency or a communications carrier different from the first communications carrier and the second communications carrier. 1. The UE of any of Appendixes D1 to D4.

[0120] (Appendix D6) The disaster PLMN list is created by the first communication carrier or the second communication carrier. 1. The UE of any of Appendixes D1 to D4.

[0121] [Appendix E] This disclosure includes the techniques described in the following appendices. However, the present invention is not limited to the techniques described in the following appendices, and various modifications are possible within the scope of the claims.

[0122] (Appendix E1) A system for providing a PLMN list that lists public land mobile networks (PLMNs) to a UE (User Equipment), comprising: at least one processor, a creation process for creating a disaster PLMN list including at least one of a second PLMN provided by a second communication carrier different from a first communication carrier that provides a first PLMN to which the UE is connected via a cellular communication system, and a disaster PLMN that has been added for use in a disaster; and executing a providing process of providing the disaster PLMN list to the UE by a communication method different from the cellular communication method when the UE cannot connect to the first PLMN by the cellular communication method. PLMN list provision system.

[0123] (Appendix E2) In the creation process, the disaster PLMN list is created based on a first PLMN list that lists the first PLMNs and a second PLMN list that lists the second PLMNs. 1. A PLMN list providing system as described in Appendix E1.

[0124] (Appendix E3) the at least one processor further performs a list acquisition process to acquire the first PLMN list and the second PLMN list from the first communication carrier and the second communication carrier, respectively. 1. A PLMN list providing system as described in Appendix E2.

[0125] (Appendix E4) The at least one processor further executes a priority determination process to determine a connection priority for each PLMN included in the disaster PLMN list. 10. A system for providing a PLMN list according to any one of appendices E1 to E3.

[0126] (Appendix E5) In the priority determination process, the priority is determined based on PLMN load information acquired for each PLMN included in the disaster PLMN list. 1. A PLMN list providing system as described in Appendix E4.

[0127] (Appendix E6) The disaster PLMN list is created by a centralized management system owned by a government agency or a communications carrier different from the first communications carrier and the second communications carrier. 10. A system for providing a PLMN list according to any one of appendices E1 to E5.

[0128] (Appendix E7) The disaster PLMN list is created by the first communication carrier or the second communication carrier. 10. A system for providing a PLMN list according to any one of appendices E1 to E5.

[0129] [Appendix F] This disclosure includes the techniques described in the following appendices. However, the present invention is not limited to the techniques described in the following appendices, and various modifications are possible within the scope of the claims.

[0130] (Appendix F1) A program that causes at least one processor to function as a PLMN list providing system for providing a PLMN list that lists PLMNs to a UE (User Equipment), the program comprising: a creation process for creating a disaster PLMN list including at least one of a second PLMN provided by a second communication carrier different from a first communication carrier that provides a first PLMN to which the UE is connected via a cellular communication system, and a disaster PLMN that has been added for use in a disaster; a PLMN list providing program that executes a providing process for providing the disaster PLMN list to the UE via a communication method different from the cellular communication method when the UE cannot connect to the first PLMN via the cellular communication method; Non-transitory recording media on which [Explanation of symbols]

[0131] 1, 1A, 1B PLMN list provision system 2. First Telecommunications Carrier 3 Secondary carriers 6UE 11 Creation Department 12 Providing Department 21 1st load information acquisition section 22 1st priority determination section 23 First Creation Section 24 1st provision part 31 2nd load information acquisition section 32 2nd priority determination section 33 Second Creation Division 34 Second provision part 51 List Acquisition Unit 52 3rd priority determination section 53 Third Creation Department 54 Third provision part 61 UE provision department 62 UE Acquisition Department

Claims

1. A system for providing a public land mobile network (PLMN) list to a user equipment (UE), comprising: a creating means for creating a disaster PLMN list including at least one of a second PLMN provided by a second communication carrier different from a first communication carrier that provides a first PLMN to which the UE is connected by a cellular communication method, and a disaster PLMN that is added for use in disasters; providing means for providing the disaster PLMN list to the UE by a communication method different from the cellular communication method when the UE cannot connect to the first PLMN by the cellular communication method; PLMN list provision system.

2. the creation means creates the disaster PLMN list based on a first PLMN list that lists the first PLMNs and a second PLMN list that lists the second PLMNs; The PLMN list providing system according to claim 1 .

3. further comprising a list acquisition means for acquiring the first PLMN list and the second PLMN list from the first communication carrier and the second communication carrier, respectively; The PLMN list providing system according to claim 2 .

4. further comprising a priority determination means for determining a connection priority for each PLMN included in the disaster PLMN list; The PLMN list providing system according to claim 1 .

5. the priority determination means determines the priority based on PLMN load information acquired for each PLMN included in the disaster PLMN list; The PLMN list providing system according to claim 4.

6. The disaster PLMN list is created by a centralized management system owned by a government agency or a communication carrier different from the first communication carrier and the second communication carrier. The PLMN list providing system according to claim 1 .

7. The disaster PLMN list is created by the first communication carrier or the second communication carrier. The PLMN list providing system according to claim 1 .

8. A method performed by a PLMN list providing system for providing a PLMN list that lists public land mobile networks (PLMNs) to a user equipment (UE), the method comprising: a creation process of creating a disaster PLMN list including at least one of a second PLMN provided by a second communication carrier different from a first communication carrier that provides a first PLMN to which the UE is connected via a cellular communication system, and a disaster PLMN that is added for use in disasters; and a providing process of providing the disaster PLMN list to the UE by a communication method different from the cellular communication method when the UE cannot connect to the first PLMN by the cellular communication method. Method for providing a PLMN list.

9. A program that causes at least one processor to function as a PLMN list providing system for providing a PLMN list that lists public land mobile networks (PLMNs) to a UE (User Equipment), the program comprising: the at least one processor, a creating means for creating a disaster PLMN list including at least one of a second PLMN provided by a second communication carrier different from a first communication carrier that provides a first PLMN to which the UE is connected by a cellular communication method, and a disaster PLMN that is added for use in disasters; providing means for providing the disaster PLMN list to the UE by a communication method different from the cellular communication method when the UE cannot connect to the first PLMN by the cellular communication method; A PLMN list providing program that functions as a

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