Method and apparatus for manually selecting network

Abstract

The invention relates to a method and a device for manually selecting a network. In one embodiment, a method includes determining, by a user equipment, that a non-closed access group cell is available for use by the user equipment in a public land mobile network, where the public land mobile network is identified by a public land mobile network identification, and only allowing the user equipment to access the public land mobile network via one or more closed access group cells; displaying the public land mobile network identifier to a user; receiving a user input selecting the public land mobile network identity; and transmitting a registration request to the public land mobile network identified by the public land mobile network identification.

Description

[0001] This divisional application is a divisional application of Chinese patent application No. 202080075004.X, filed on September 4, 2020, with the invention name “Method and device for manual network selection”. Technical Field

[0002] The present disclosure relates to an apparatus, a method and a computer program, and particularly, but not exclusively, to an apparatus, a method and a computer program for manually selecting a network. Background Art

[0003] A communication system can be viewed as a facility that enables communication sessions between two or more entities (such as communication devices, base stations / access points, and / or other nodes) by providing a carrier wave between the various entities involved in the communication path. A communication system can be provided, for example, by means of a communication network and one or more compatible communication devices.

[0004] Access to the communication system may be via an appropriate communication device or terminal. The communication device is equipped with appropriate signal receiving and transmitting equipment for achieving communication (e.g., achieving access to a communication network or direct communication with other communication devices). The communication device may access a carrier provided by a station or access point and transmit and / or receive communications on the carrier.

[0005] Communication systems and associated devices typically operate according to a given standard or specification that sets out what the various entities associated with the system are permitted to do and how it should be achieved. Summary of the invention

[0006] According to one aspect, a method is provided, the method comprising: determining, by a user equipment, that a non-closed access group cell is available for use by the user equipment in a public land mobile network, wherein the public land mobile network is identified by a public land mobile network identifier and the user equipment is only allowed to access the public land mobile network via one or more closed access group cells; displaying the public land mobile network identifier to a user; receiving user input selecting the public land mobile network identifier; and transmitting a registration request to the public land mobile network identified by the public land mobile network identifier.

[0007] The public land mobile network identity may be stored in a list comprising one or more public land mobile network identities, wherein for each public land mobile network identity there are associated zero or more closed access group identities that the user equipment is allowed to use in the public land mobile network identified by the public land mobile network identity.

[0008] For each public land mobile network identity, there may be an indication that the user equipment is only allowed to access the 5G system via closed access group cells.

[0009] The displayed public land mobile network identity may be associated with an indication that user equipment is only permitted to access the public land mobile network identified by the public land mobile network identity via one or more closed access group cells.

[0010] The method may include: receiving a registration acceptance message; and deleting the indication that the public land mobile network identified by the public land mobile network identifier only allows the user equipment to access the 5G system via a closed access group cell.

[0011] The method may include: receiving a registration reject message; and retaining the indication that the user equipment is only allowed to access the 5G system via a closed access group cell.

[0012] Displaying the public land mobile network identity may comprise displaying the public land mobile network identity in association with a list of one or more closed access group identities, wherein there are closed access group cells available for use by a user equipment in the public land mobile network identified by the public land mobile network identity, and wherein for each of the closed access group identities it is indicated whether the closed access group identity allows the user equipment.

[0013] The list including the one or more closed access group identifiers may include a closed access group identifier field, if the entry has a closed access group identifier, then the closed access group identifier field is filled with the corresponding closed access group identifier, or if the entry does not have a closed access group identifier, then the closed access group identifier field is filled with an entry indicating a null closed access group identifier.

[0014] The method may include displaying the public land mobile network identity without the list of one or more closed access group identities in addition to displaying the public land mobile network identity with the list of one or more closed access group identities.

[0015] According to one aspect, a device is provided, the device comprising means for performing the following operations: determining that a non-closed access group cell is available for use by a user equipment in a public land mobile network, wherein the public land mobile network is identified by a public land mobile network identifier and the user equipment is only allowed to access the public land mobile network via one or more closed access group cells; displaying the public land mobile network identifier to a user; receiving user input selecting the public land mobile network identifier; and transmitting a registration request to the public land mobile network identified by the public land mobile network identifier.

[0016] The public land mobile network identity may be stored in a list comprising one or more public land mobile network identities, wherein for each public land mobile network identity there are associated zero or more closed access group identities that the user equipment is allowed to use in the public land mobile network identified by the public land mobile network identity.

[0017] For each public land mobile network identity, there may be an indication that the user equipment is only allowed to access the 5G system via closed access group cells.

[0018] The displayed public land mobile network identity may be associated with an indication that user equipment is only permitted to access the public land mobile network identified by the public land mobile network identity via one or more closed access group cells.

[0019] The apparatus may also be configured to perform: receiving a registration acceptance message; and deleting the indication that the public land mobile network identified by the public land mobile network identifier only allows the user equipment to access the 5G system via a closed access group cell.

[0020] The apparatus may also be configured to perform: receiving a registration rejection message; and retaining the indication that the user equipment is only allowed to access the 5G system via a closed access group cell.

[0021] Displaying the public land mobile network identity may comprise displaying the public land mobile network identity in association with a list of one or more closed access group identities, wherein there are closed access group cells available for use by a user equipment in the public land mobile network identified by the public land mobile network identity, and wherein for each of the closed access group identities it is indicated whether the closed access group identity allows the user equipment.

[0022] The list including the one or more closed access group identifiers may include a closed access group identifier field, if the entry has a closed access group identifier, then the closed access group identifier field is filled with the corresponding closed access group identifier, or if the entry does not have a closed access group identifier, then the closed access group identifier field is filled with an entry indicating a null closed access group identifier.

[0023] The apparatus may also be configured to perform: displaying the public land mobile network identifier without the list of one or more closed access group identifiers in addition to the public land mobile network identifier displayed together with the list of one or more closed access group identifiers. According to one aspect, a device is provided, the device comprising: at least one processor; and at least one memory, the at least one memory comprising computer program code, the at least one memory and the computer program code being configured to cause the device, through the at least one processor, to perform: determining that a non-closed access group cell is available for use by a user device in a public land mobile network, wherein the public land mobile network is identified by a public land mobile network identifier and the user device is only allowed to access the public land mobile network via one or more closed access group cells; displaying the public land mobile network identifier to a user; receiving user input selecting the public land mobile network identifier; and transmitting a registration request to the public land mobile network identified by the public land mobile network identifier.

[0024] The public land mobile network identity may be stored in a list comprising one or more public land mobile network identities, wherein for each public land mobile network identity there are associated zero or more closed access group identities that the user equipment is allowed to use in the public land mobile network identified by the public land mobile network identity.

[0025] For each public land mobile network identity, there may be an indication that the user equipment is only allowed to access the 5G system via closed access group cells.

[0026] The displayed public land mobile network identity may be associated with an indication that user equipment is only permitted to access the public land mobile network identified by the public land mobile network identity via one or more closed access group cells.

[0027] The device may also be configured to perform: receiving a registration acceptance message; and deleting the indication that the public land mobile network identified by the public land mobile network identifier only allows the user equipment to access the 5G system via a closed access group cell.

[0028] The device may also be configured to perform: receiving a registration rejection message; and retaining the indication that the user equipment is only allowed to access the 5G system via a closed access group cell.

[0029] Displaying the public land mobile network identity may comprise displaying the public land mobile network identity in association with a list of one or more closed access group identities, wherein there are closed access group cells available for use by a user equipment in the public land mobile network identified by the public land mobile network identity, and wherein for each of the closed access group identities it is indicated whether the closed access group identity allows the user equipment.

[0030] The list including the one or more closed access group identifiers may include a closed access group identifier field, if the entry has a closed access group identifier, then the closed access group identifier field is filled with the corresponding closed access group identifier, or if the entry does not have a closed access group identifier, then the closed access group identifier field is filled with an entry indicating a null closed access group identifier.

[0031] The apparatus may be further configured to perform: displaying the public land mobile network identity without the list of one or more closed access group identities in addition to displaying the public land mobile network identity with the list of one or more closed access group identities.

[0032] According to one aspect, a non-transitory computer-readable storage medium is provided, the non-transitory computer-readable storage medium comprising computer-readable instructions, which, when executed by at least one processor, cause the device to: determine that a non-closed access group cell is available for use by a user device in a public land mobile network, wherein the public land mobile network is identified by a public land mobile network identifier and the user device is only allowed to access the public land mobile network via one or more closed access group cells; display the public land mobile network identifier to a user; receive user input selecting the public land mobile network identifier; and transmit a registration request to the public land mobile network identified by the public land mobile network identifier.

[0033] According to one aspect, a computer program is provided, the computer program comprising instructions for causing a device to at least perform: determining that a non-closed access group cell is available for use by a user equipment in a public land mobile network, wherein the public land mobile network is identified by a public land mobile network identifier and the user equipment is only allowed to access the public land mobile network via one or more closed access group cells; displaying the public land mobile network identifier to a user; receiving user input selecting the public land mobile network identifier; and transmitting a registration request to the public land mobile network identified by the public land mobile network identifier.

[0034] According to one aspect, a device is provided, comprising: a determination circuit system, the determination circuit system being used to determine that a non-closed access group cell is available for use by a user equipment in a public land mobile network, wherein the public land mobile network is identified by a public land mobile network identifier and the user equipment is only allowed to access the public land mobile network via one or more closed access group cells; a display circuit system, the display circuit system being used to display the public land mobile network identifier to a user; a receiving circuit system, the receiving circuit system being used to receive user input selecting the public land mobile network identifier; and a transmission circuit system, the transmission circuit system being used to transmit a registration request to the public land mobile network identified by the public land mobile network identifier.

[0035] In the above, many different aspects have been described. It should be appreciated that further aspects may be provided by combining any two or more of the above aspects.

[0036] Various other aspects are also described in the following detailed description and appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Some example embodiments will now be described in further detail, by way of example only, with reference to the following examples and accompanying drawings, in which:

[0038] Figure 1 shows a representation of a network system according to some example embodiments;

[0039] Figure 2 shows a representation of a control device according to some example embodiments;

[0040] Figure 3 shows representations of devices according to some example embodiments;

[0041] Figure 4 shows a representation of a registration process according to some example embodiments;

[0042] Figure 5 shows a representation of a non-volatile memory medium according to some example embodiments; and

[0043] Figure 6 Methods according to some example embodiments are shown. DETAILED DESCRIPTION

[0044] In the following, certain embodiments are explained with reference to a mobile communication device capable of communicating via a wireless cellular system and a mobile communication system serving such a mobile communication device. Figure 1 , Figure 2 and Figure 3Certain general principles of wireless communication systems, their access systems and mobile communication devices are briefly explained to help understand the underlying technology of the described examples.

[0045] Figure 1 A schematic representation of a 5G system (5GS) is shown. The 5GS may consist of a terminal or user equipment (UE), a 5G radio access network (5GRAN) or next generation radio access network (NG-RAN), a 5G core network (5GC), one or more application functions (AFs), and one or more data networks (DNs).

[0046] The 5G-RAN may include one or more gNodeBs (GNBs) or one or more gNodeB (GNB) distributed unit functions connected to one or more gNodeB (GNB) centralized unit functions.

[0047] 5GC may include the following entities: network slice selection function (NSSF); network exposure function; network repository function (NRF); policy control function (PCF); unified data management (UDM); application function (AF); authentication server function (AUSF); access and mobility management function (AMF); and session management function (SMF).

[0048] Figure 2 shows the control method for Figure 1 2. An example of a control device 200 for the functions of a 5GRAN or 5GC shown in FIG. The control device may include at least one random access memory (RAM) 211a, at least one read-only memory (ROM) 211b, at least one processor 212, 213, and an input / output interface 214. At least one processor 212, 213 may be coupled to the RAM 211a and the ROM 211b. At least one processor 212, 213 may be configured to execute appropriate software code 215. The software code 215 may, for example, allow one or more steps to be executed to perform one or more of the aspects of the present invention. The software code 215 may be stored in the ROM 211b. The control device 200 may be interconnected with another control device 200 that controls another function of the 5GRAN or 5GC. In some embodiments, each function of the 5GRAN or 5GC includes a control device 200. In an alternative embodiment, two or more functions of the 5GRAN or 5GC may share a control device.

[0049] Figure 3 The terminal 300 (such as Figure 1The terminal 300 is an example of a terminal shown in FIG. 300. The terminal 300 may be provided by any device capable of sending and receiving radio signals. Non-limiting examples include user equipment, a mobile station (MS) or a mobile device (such as a mobile phone or so-called "smart phone"), a computer with a wireless interface card or other wireless interface facilities (e.g., a USB dongle), a personal data assistant (PDA) or tablet computer with wireless communication capabilities, a machine type communication (MTC) device, an Internet of Things (IoT) type communication device, or any combination of these devices. The terminal 300 may provide communications, such as data for carrying communications. The communications may be one or more of voice, electronic mail (email), text messaging, multimedia, data, machine data, etc.

[0050] The terminal 300 may receive signals over the air or radio interface 307 via suitable equipment for reception, and may transmit signals via suitable equipment for transmitting radio signals. Figure 3 In FIG. 3 , the transceiver device is schematically indicated by block 306. The transceiver device 306 may be provided, for example, by means of a radio part and an associated antenna arrangement. The antenna arrangement may be arranged internally or externally to the mobile device.

[0051] The terminal 300 may be provided with at least one processor 301, at least one memory ROM 302a, at least one RAM 302b and possibly other components 303 for use in the software and hardware assisted execution of the tasks it is designed to perform, including controlling access to and communication with access systems and other communication devices. The at least one processor 301 is coupled to the RAM 311a and the ROM 311b. The at least one processor 301 may be configured to execute appropriate software code 308. The software code 308 may, for example, allow the execution of one or more of the aspects of the present invention. The software code 308 may be stored in the ROM 311b.

[0052] The processor, storage device and other related control equipment may be provided on an appropriate circuit board and / or in a chipset. This feature is indicated by reference numeral 304. The device may optionally have a user interface, such as a keypad 305, a touch-sensitive screen or touchpad, a combination thereof, etc. Optionally, one or more of a display, a speaker and a microphone may be provided depending on the type of device.

[0053] Certain cells in a wireless communication network may be designated as closed access group (CAG) cells. CAG defines a limited set of UEs that can access a specific CAG cell or cell group. UEs outside the CAG may not be able to access one or more cells in the CAG.

[0054] In some cases, manual CAG selection may be permitted. In manual CAG selection, the user may be allowed to manually select a CAG ID that is not in the allowed CAG list. To make this functionality available, the UE may display one or more CAG IDs that are not in the allowed CAG list. If the user selects a CAG ID that is not allowed, the UE may initiate a registration procedure. If the registration procedure is successful, the UE may add the selected CAG ID to the allowed CAG list.

[0055] In some cases, the UE may only be allowed to access a public land mobile network (PLMN) via certain CAG cells. However, the user may choose to only allow access to PLMNs via CAGs that are not in the allowed CAG list. Therefore, even if the UE is only allowed to access the PLMNs via CAG cells, the user may need to be able to select the PLMN without selecting a CAG.

[0056] In some example embodiments, there is provided a Figure 6 The method shown.

[0057] At step 600, the method includes determining, by the user equipment, that non-closed access group cells are available for use by the user equipment in a public land mobile network. The public land mobile network is identified by a public land mobile network identifier and the user equipment is only allowed to access the public land mobile network via one or more closed access group cells.

[0058] At step 602, the method includes displaying a public land mobile network identity to a user.

[0059] At step 604, the method includes receiving user input selecting a public land mobile network identification.

[0060] At step 606, the method includes transmitting a registration request to the public land mobile network identified by the public land mobile network identification.

[0061] An example of a registration process according to some example embodiments is shown in Figure 4 Shown in.

[0062] like Figure 4 As shown, the user equipment transmits a message including a registration request to the access management function (AMF).

[0063] When the registration process is successful, the AMF transmits a Registration Accept message to the user equipment. Alternatively, if the registration process is unsuccessful, for example if the AMF needs to reject the registration request from the UE, the AMF sends a Registration Reject message.

[0064] In some example embodiments, the displayed information indicating one or more public land mobile networks may indicate which public land mobile networks are available using all supported radio access technologies. The PLMNs that meet the above criteria may be presented in the following order:

[0065] i) if one or more Equivalent Home Public Land Mobile Networks (EHPLMNs) are available, then based on an optional data field on a Universal Mobile Telecommunications System Subscriber Identity Module (USIM), only the highest priority available EHPLMNs are presented to the user, or all available EHPLMNs are presented to the user in order of priority. Alternatively, if the EHPLMN list is not present or is empty, or if the data field is not present on the USIM, then a Home Public Land Mobile Network (HPLMN) is presented instead of an EHPLMN;

[0066] ii) PLMN / Radio Access Technology combinations contained in the USIM in order of priority. The PLMN / Radio Access Technology may be stored in the "User controlled PLMN selector with access technology" data file in the USIM;

[0067] iii) PLMN / Radio Access Technology combinations contained in the USIM in order of priority. The PLMN / Radio Access Technology combinations may be stored in a "PLMN selector with operator control of access technology" data file in the USIM. Additionally or alternatively, the PLMN / Radio Access Technology combinations may be stored in a Mobility Engine (ME);

[0068] iv) other PLMN / radio access technology combinations that received the highest quality signal. If more than one PLMN / radio access technology has the same highest signal quality, the more than one PLMN / radio access technology with the highest signal quality may be displayed in a random order; and v) other PLMN / radio access technology combinations in order of decreasing signal quality.

[0069] In some example embodiments, if the UE supports the CAG feature and the allowed CAG list includes at least one entry, then for each PLMN / radio access technology combination of the NG-RAN access technology, the UE may display a list of PLMN / radio access technology combinations and one or more CAG identifiers (IDs) such that for each CAG-ID, there is an available CAG cell broadcasting the CAG-ID of the PLMN. Additionally, if there is an entry with the PLMN ID of the PLMN in the "CAG Information List" and the CAG-ID is included in the allowed CAG list, the UE may display an indication that the CAG-ID is allowed. Additionally or alternatively, whenever a CAG-ID is displayed, the UE may display whether the CAG-ID is allowed.

[0070] Alternatively, in some example embodiments, if there is an available cell that is not a CAG cell for a PLMN, the UE may display the PLMN / radio access technology combination without a CAG-ID list. In addition, if there is an entry with a PLMN ID of a PLMN in the "CAG Information List", the entry includes an indication that the UE is only allowed to access the 5GS via a CAG cell, the UE may present to the user an indication that the UE is only allowed to access the 5GS (or PLMN) via a CAG cell. Additionally or alternatively, whenever a PLMN / radio access technology combination is displayed without a CAG-ID list, the UE may display whether the UE is only allowed to access the PLMN via a CAG cell.

[0071] In some example embodiments, if there are both available CAG cells and available non-CAG NG-RAN cells for a PLMN, the PLMN / radio access technology combinations may be displayed twice: first, a list of PLMN / radio access technology combinations with the CAG-ID, and second, a list of PLMN / radio access technology combinations without the CAG-ID.

[0072] Alternatively, in some example embodiments, the UE may display a list of primary PLMN / access technology combinations. The list may include a CAG-ID field, which is populated with the CAG ID if the entry has a CAG ID, or with an entry indicating a null CAG-ID if the entry does not have a CAG ID.

[0073] In some example embodiments, how the UE displays the PLMN / Radio Access Technology combinations and the CAG-ID list such that there are both available CAG cells and available non-CAG NG-RAN cells for the PLMN may be UE implementation specific.

[0074] In some example embodiments, the UE may initiate a registration procedure by sending a Registration Request message to the AMF when:

[0075] (a) the UE selects a CAG-ID that is not included in the allowed CAG list of the selected PLMN; or

[0076] (b) a CAG-ID in a PLMN where the entry in the “CAG Information List” does not exist; or

[0077] (c) The UE selects a PLMN in which the entry in the "CAG Information List" includes an indication that the UE is only allowed to access the 5GS via the CAG cell without selecting a CAG-ID.

[0078] If the UE initiates a registration procedure due to manual CAG selection and receives a registration accept message, and the UE has already initiated the registration procedure in a CAG cell, the UE may add the selected CAG-ID to the allowed CAG list of the current PLMN if not already included.

[0079] Alternatively, if the UE initiates a registration procedure due to manual CAG selection and receives a registration acceptance message, and the UE has initiated the registration procedure in a non-CAG cell, the UE may delete the indication that the UE is only allowed to access the 5GS via a CAG cell from the entry in the "CAG Information List" of the current PLMN (if any).

[0080] In some example embodiments, the AMF may reject the registration request from the UE if the UE does not pass the CAG access control. In this case, the AMF may send a registration reject message and a "CAG information list" or a portion of a "CAG information list". For example, if the UE accesses a PLMN by selecting a CAG-ID that the UE is not allowed to use in the PLMN, the network may send the allowed CAG list of the PLMN together with the registration reject message.

[0081] Figure 5 Schematic representations of non-volatile memory media 500a (e.g., a computer disk (CD) or digital versatile disk (DVD)) and 500b (e.g., a universal serial bus (USB) memory stick) storing instructions and / or parameters 502 that, when executed by a processor, enable the processor to perform one or more of the steps of the previously described method.

[0082] It should be noted that embodiments of the present invention may be implemented as circuit systems, in software, hardware, application logic, or a combination of software, hardware, and application logic. In example embodiments, the application logic, software, or instruction set is maintained on any of a variety of conventional computer-readable media. In the context of this document, a "computer-readable medium" may be any medium or device that can contain, store, transmit, propagate, or transfer instructions for use by or in conjunction with an instruction execution system, device, or apparatus (such as a computer or smart phone, or user equipment).

[0083] As used in this application, the term "circuitry" refers to all of the following: (a) hardware circuit implementations only (such as implementations in analog and / or digital circuitry only); and (b) combinations of circuitry and software (and / or firmware), such as (as applicable): (i) a combination of one or more processors, or (ii) portions of one or more processors / software (including one or more digital signal processors, software, and one or more memories that work together to enable a device (such as a mobile phone or server) to perform various functions); and (c) circuitry that requires software or firmware to operate (such as one or more microprocessors or portions of one or more microprocessors), even if the software or firmware is not actually present. This definition of "circuitry" applies to all uses of this term in this application (including in any claims). As another example, as used in this application, the term "circuitry" would also cover implementations of only a processor (or multiple processors) or portions of a processor and its (or their) accompanying software and / or firmware. For example, and where applicable to a particular claim element, the term "circuitry" would also cover a baseband integrated circuit or application processor integrated circuit for a mobile phone, or a similar integrated circuit in a server, cellular network device, or other network device.

[0084] In one or more embodiments, the described features, advantages and characteristics of the present invention can be combined in any suitable manner. It will be appreciated by those skilled in the relevant art that the present invention can be practiced without one or more of the specific features or advantages of a particular embodiment. In other cases, additional features and advantages that may not be present in all embodiments of the present invention may be recognized in certain embodiments. It will be readily appreciated by those of ordinary skill in the art that the present invention as discussed above can be practiced with steps in different orders and / or with hardware elements having a configuration different from the disclosed configuration. Therefore, although the present invention has been described based on these preferred embodiments, it will be apparent to those skilled in the art that certain modifications, variations and alternative configurations will be apparent without departing from the spirit and scope of the present invention.

Claims

1. A method, comprising: determining, by a user equipment, that a cell is available for use by the user equipment in a public land mobile network and that the cell is not a closed access group cell for the public land mobile network, wherein the user equipment is only allowed to access the public land mobile network via one or more closed access group cells; Based on the determination, displaying at least the public land mobile network on the user equipment for user selection; receiving a user selection of the public land mobile network; as well as Based on the received user selection, a registration request is transmitted to the selected public land mobile network.

2. The method of claim 1, wherein said displaying at least said public land mobile network comprises displaying a list of said public land mobile networks without a closed access group identifier.

3. The method of claim 2, further comprising: A list of the public land mobile networks and one or more closed access group identifiers is displayed, wherein for each closed access group identifier there is an available closed access group cell that broadcasts the closed access group identifier in the public land mobile network.

4. The method of claim 3, wherein the closed access group identity of the closed access group cell is included in a list of closed access group identities that the user equipment is allowed to use in the public land mobile network.

5. The method of claim 3, wherein for each of the closed access group identities, it is indicated whether the user equipment is allowed to use the closed access group identity.

6. A method as claimed in any one of claims 1 to 5, wherein the entry for the public land mobile network in the closed access group information list comprises an indication that the user equipment is only allowed to access the public land mobile network via one or more closed access group cells.

7. The method of claim 6 , wherein the public land mobile network identity of the public land mobile network is stored in the closed access group information list, the closed access group information list comprising one or more public land mobile network identities, wherein for each public land mobile network identity, there are associated zero or more closed access group identities that the user equipment is allowed to use in the public land mobile network.

8. The method of claim 7, wherein for each public land mobile network identifier, there is an indication that the user equipment is only allowed to access the 5G system via a closed access group cell.

9. The method according to any one of claims 6 to 8, comprising: Receive registration acceptance message; as well as The indication to the public land mobile network that the user equipment is only allowed to access the 5G system via a closed access group cell is deleted.

10. The method according to any one of claims 6 to 8, comprising: Receive a registration rejection message; as well as The indication that the user equipment is only allowed to access the 5G system via closed access group cells is retained.

11. A device, comprising: at least one processor; as well as at least one memory, the at least one memory comprising computer program code, the at least one memory and the computer program code being configured to cause, by the at least one processor, the apparatus to execute: determining that a cell is available for use by the device in a public land mobile network and that the cell is not a closed access group cell for the public land mobile network, wherein the user equipment is only allowed to access the public land mobile network via one or more closed access group cells; Based on the determination, displaying at least the public land mobile network for selection by a user; receiving a user selection of the public land mobile network; as well as Based on the received user selection, a registration request is transmitted to the selected public land mobile network.

12. The apparatus of claim 11, wherein the displaying at least the public land mobile networks comprises displaying a list of the public land mobile networks without closed access group identifiers.

13. The apparatus of claim 12, wherein the apparatus is further configured to perform: A list of the public land mobile networks and one or more closed access group identifiers is displayed, wherein for each closed access group identifier there is an available closed access group cell that broadcasts the closed access group identifier in the public land mobile network.

14. The apparatus of claim 13, wherein the closed access group identity of the closed access group cell is included in a list of closed access group identities that the user equipment is allowed to use in the public land mobile network.

15. The apparatus of claim 13, wherein for each of the closed access group identities, it is indicated whether the user equipment is allowed to use the closed access group identity.

16. The apparatus of any one of claims 13 to 15, wherein the list of one or more closed access group identifiers comprises a closed access group identifier field, the closed access group identifier field being filled with the corresponding closed access group identifier if the entry has a closed access group identifier, or being filled with an entry indicating an empty closed access group identifier if the entry does not have a closed access group identifier.

17. The apparatus of any one of claims 11 to 16, wherein the entry for the public land mobile network in the closed access group information list comprises an indication that the user equipment is only allowed to access the public land mobile network via one or more closed access group cells.

18. The apparatus of claim 17, wherein a public land mobile network identity of the public land mobile network is stored in the closed access group information list, the closed access group information list comprising one or more public land mobile network identities, wherein for each public land mobile network identity, there are associated zero or more closed access group identities that the user equipment is allowed to use in the public land mobile network.

19. The apparatus of claim 18, wherein for each public land mobile network identity, there is an indication that the user equipment is only allowed to access the 5G system via a closed access group cell.

20. The apparatus of any one of claims 17 to 19, wherein the apparatus is further configured to perform: receiving a registration acceptance message; and The indication to the public land mobile network that the user equipment is only allowed to access the 5G system via a closed access group cell is deleted.

21. The apparatus of any one of claims 17 to 19, wherein the apparatus is further configured to perform: receiving a registration rejection message; and The indication that the user equipment is only allowed to access the 5G system via closed access group cells is retained.

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