Content for  TS 23.122  Word version:  18.6.0

The MS selects and attempts registration on other PLMN/access technology combinations, if available and, for bullets i, ii, iii, iv, v, allowable, in the following order:

1. either the HPLMN (if the EHPLMN list is not present or is empty) or the highest priority EHPLMN that is available (if the EHPLMN list is present);
2. each PLMN/access technology combination in the "User Controlled PLMN Selector with Access Technology" data file in the SIM (in priority order);
3. each PLMN/access technology combination in the "Operator Controlled PLMN Selector with Access Technology" data file in the SIM (in priority order) or stored in the ME (in priority order);
4. other PLMN/access technology combinations with received high quality signal in random order;
5. other PLMN/access technology combinations in order of decreasing signal quality.
6. PLMN/NG-RAN combinations for any forbidden PLMNs broadcasting the PLMN ID of the MS determined PLMN with disaster condition or broadcasting the disaster related indication and matching the below conditions:
   1. if the indication of 'applicability of "lists of PLMN(s) to be used in disaster condition" provided by a VPLMN' is set to true:
      • each PLMN in the "list of PLMN(s) to be used in disaster condition" stored in the ME which is associated with the PLMN ID of the MS determined PLMN with disaster condition, if any, ordered based on this list; otherwise
      • if the ME does not have a stored "list of PLMN(s) to be used in disaster condition" associated with the PLMN ID of the MS determined PLMN with disaster condition, each PLMN in the "list of PLMN(s) to be used in disaster condition" stored in the ME which is associated with the PLMN ID of the HPLMN, if any, ordered based on this list.
   2. if the indication of 'applicability of "lists of PLMN(s) to be used in disaster condition" provided by a VPLMN' is set to false:
      • each PLMN in the "list of PLMN(s) to be used in disaster condition" stored in the ME which is associated with the HPLMN, if any, ordered based on this list.
7. PLMN /NG-RAN combinations for other forbidden PLMNs broadcasting the PLMN ID of the MS determined PLMN with disaster condition or broadcasting the disaster related indication, in random order.

When following the above procedure the following requirements apply: If successful registration is achieved, the MS indicates the selected PLMN. If registration cannot be achieved because no PLMNs are available and allowable, and the MS does not support access to RLOS, the MS indicates "no service" to the user, waits until a new PLMN is available and allowable and then repeats the procedure. If there were one or more PLMNs which were available and allowable, but an LR failure made registration on those PLMNs unsuccessful or an entry in any of the lists "forbidden location areas for roaming", "forbidden tracking areas for roaming", "5GS forbidden tracking areas for roaming", "forbidden location areas for regional provision of service", "forbidden tracking areas for regional provision of service", "5GS forbidden tracking areas for regional provision of service", "CAG information list", or "PLMNs not allowed to operate at the present UE location" prevented a registration attempt, the MS selects the first such PLMN again and enters a limited service state. If:

• the MS supports access to RLOS;
• either the UICC containing the USIM is not present in the MS, or the UICC containing the USIM is present in the MS and the MCC part of the IMSI in the USIM is present in the RLOS allowed MCC list configured in the USIM (see TS 31.102) or in the ME (see TS 24.368);
• one or more PLMNs offering access to RLOS has been found;
• registration cannot be achieved on any PLMN; and
• the MS is in limited service state,

the MS shall select a PLMN offering access to RLOS as follows:

1. if at least one preferred PLMN exists based on the RLOS preferred PLMN list configured in the USIM (see TS 31.102) or in the ME (see TS 24.368) and the MCC part of the preferred PLMN ID is present in the RLOS allowed MCC list configured in the USIM (see TS 31.102) or in the ME (see TS 24.368), the MS shall select the preferred PLMN offering access to RLOS and indicate the selected preferred PLMN for access to RLOS; and
2. if none of the preferred PLMNs for access to RLOS is available, the MS shall evaluate the remaining PLMNs offering access to RLOS that are not in the RLOS preferred PLMN list. If the MCC part of a PLMN ID is present in the RLOS allowed MCC list configured in the USIM (see TS 31.102) or in the ME (see TS 24.368), the MS shall select this PLMN and indicate the selected PLMN for access to RLOS.

If registration cannot be achieved because no PLMNs are available and allowable, and if no PLMN offering access to RLOS has been found, or none of the PLMNs offering access to RLOS is allowed to be accessed according to the RLOS allowed MCC list configured in the USIM (see TS 31.102) or in the ME (see TS 24.368), or the MS does not support access to RLOS, the MS indicates "no service" to the user, waits until a new PLMN is available and then repeats the procedure.

The MS indicates whether there are any PLMNs, which are available using all supported access technologies. This includes PLMNs in the "forbidden PLMNs" list, "forbidden PLMNs for GPRS service" list, PLMNs which only offer services not supported by the MS, and the list of "PLMNs not allowed to operate at the present UE location". An MS which supports GSM COMPACT shall also indicate GSM COMPACT PLMNs (which use PBCCH). If displayed, PLMNs meeting the criteria above are presented in the following order:

1. either the HPLMN (if the EHPLMN list is not present or is empty) or, if one or more of the EHPLMNs are available then based on an optional data field on the SIM either only the highest priority available EHPLMN is to be presented to the user or all available EHPLMNs are presented to the user in priority order. If the data field is not present on the SIM, then only the highest priority available EHPLMN is presented;
2. PLMN/access technology combinations contained in the "User Controlled PLMN Selector with Access Technology" data file in the SIM (in priority order);
3. PLMN/access technology combinations contained in the "Operator Controlled PLMN Selector with Access Technology" data file in the SIM (in priority order) or stored in the ME (in priority order);
4. other PLMN/access technology combinations with received high quality signal in random order;
5. other PLMN/access technology combinations in order of decreasing signal quality.

In ii and iii, an MS using a SIM without access technology information storage (i.e. the "User Controlled PLMN Selector with Access Technology" and the "Operator Controlled PLMN Selector with Access Technology" data files are not present) shall instead present the PLMNs contained in the "PLMN Selector" data file in the SIM (in priority order). In v, requirement h) in clause 4.4.3.1.1 applies. In i to v, requirements j), k) and l) in clause 4.4.3.1.1 apply. In iii, requirement p) in clause 4.4.3.1.1 applies. In GSM COMPACT, the non-support of voice services shall be indicated to the user. The HPLMN may provide on the SIM additional information on the available PLMNs. If this information is provided, then the MS shall indicate it to the user. This information, provided as free text may include:

• preferred partner,
• roaming agreement status,
• supported services

Furthermore, the MS may indicate whether the available PLMNs are present on the EHPLMN list, the Forbidden list, the User Controlled PLMN List or the Operator Controlled PLMN List. The MS may also indicate that the PLMN is not present on any of these lists. If:

• the MS supports MINT;
• the MS is not registered via non-3GPP access connected to 5GCN;
• the MS has detected that the RPLMN is a MS determined PLMN with disaster condition as broadcasted by an NG-RAN cell of an available PLMN(s) (see clause 4.4.3.1.1);
• only forbidden PLMN(s) are available; and
• the MS receives indication that some of the forbidden PLMN(s) provide disaster roaming services to the MS(s) of the RPLMN (see clause 4.4.3.1.1),

then the MS may indicate to the user that those PLMN(s) support disaster roaming services. In i to v, if the MS supports CAG, for each PLMN/access technology combination of NG-RAN access technology, the MS shall present to the user:

1. the PLMN/access technology combination and a list of CAG-IDs composed of one or more CAG-IDs such that for each CAG-ID:
   1. there is an available CAG cell which broadcasts the CAG-ID for the PLMN; and
   2. the following is true:
      1. there exists an entry with the PLMN ID of the PLMN in the "CAG information list" and the CAG-ID is authorized based on the "Allowed CAG list" of the entry; or
      2. the available CAG cell broadcasting the CAG-ID for the PLMN also broadcasts that the PLMN allows a user to manually select the CAG-ID.
   For each of the presented CAG-ID, the MS may indicate to the user whether the CAG-ID is authorized based on the "Allowed CAG list" stored in the UE; and
2. the PLMN/access technology combination without a list of CAG-IDs, if there is an available NG-RAN cell which is not a CAG cell for the PLMN. If there exists an entry for the presented PLMN in the "CAG information list" and the entry includes an "indication that the MS is only allowed to access 5GS via CAG cells", the MS may indicate to the user that the MS is only allowed to access the PLMN via CAG cells.

If the NAS receives a human-readable network name associated with a CAG-ID and a PLMN ID from the AS, the human-readable network name shall be sent along with the CAG-ID and PLMN ID to the upper layer for use in manual CAG selection. Upon selection of a PLMN (and CAG-ID if the user selected a desired CAG-ID as well) by the user, the NAS shall provide the AS with the selected PLMN ID (and CAG-ID if the user selected a desired CAG-ID as well or an indication to select a non-CAG cell if the user did not select any CAG-ID) and the MS initiates registration on this PLMN (and on a cell which broadcasts the CAG-ID if the user selected a desired CAG-ID as well) using the access technology chosen by the user for that PLMN or using the highest priority available access technology for that PLMN, if the associated access technologies have a priority order (this may take place at any time during the presentation of PLMNs). For such a registration, the MS shall ignore the contents of the "forbidden location areas for roaming", "forbidden tracking areas for roaming", "5GS forbidden tracking areas for roaming", "forbidden location areas for regional provision of service", "forbidden tracking areas for regional provision of service", "5GS forbidden tracking areas for regional provision of service", "forbidden PLMNs for GPRS service", "PLMNs not allowed to operate at the present UE location" and "forbidden PLMNs" lists. Also for such a registration, if the NAS has provided the AS with an indication to select:

• a non-CAG cell, the MS shall ignore the "indication that the MS is only allowed to access 5GS via CAG cells", if any, in the "CAG information list" for the selected PLMN; or
• a selected CAG-ID and the CAG-ID is not authorized based on the "Allowed CAG list" associated with that PLMN in the "CAG information list", the MS shall consider the selected CAG-ID of the selected PLMN as authorized based on the "Allowed CAG list" for the selected PLMN for this registration attempt.

If the MS has, or is establishing, a PDU session for emergency services, a PDN connection for emergency bearer services or a PDP context for emergency bearer services or CS emergency call, being registered for emergency services or having an ongoing emergency services fallback procedure, manual network selection shall not be performed. After selection of a PLMN and CAG-ID, if the AS does not provide an indication of finding a cell belonging to the selected PLMN and which broadcasts the selected CAG-ID for the registration procedure (see TS 38.304), then:

1. the MS shall indicate to user that it can not find the selected PLMN and CAG-ID; and
2. If there is an "indication that the MS is only allowed to access 5GS via CAG cells" in the "CAG information list" for the selected PLMN, the MS may attempt to camp on a suitable CAG cell broadcasting a CAG-ID authorized based on the "Allowed CAG list" for the selected PLMN or an acceptable cell, otherwise the MS may attempt to camp on a suitable cell belonging to the selected PLMN (i.e. a non-CAG cell or a CAG cell broadcasting a CAG-ID authorized based on the "Allowed CAG list" for the selected PLMN) or an acceptable cell.

Once the MS has registered on a PLMN selected by the user, the MS shall not automatically register on a different PLMN unless:

1. the new PLMN is declared as an equivalent PLMN by the registered PLMN. If the MS is registered for disaster roaming services, the UE shall also detect that the new PLMN offers disaster roaming services to the MS determined PLMN with disaster condition as broadcasted by the NG-RAN cell of the new PLMN (see clause 4.4.3.1.1) and that the MS determined PLMN with disaster condition in the old PLMN is also a MS determined PLMN with disaster condition in the new PLMN;
2. the user selects automatic mode;
3. the user initiates an emergency call while the MS is in limited service state and either the network does not broadcast the indication of support of emergency calls in limited service state, the registration request for emergency services is rejected by the network or the attach request for emergency bearer services is rejected by the network; or
4. the user initiates access to RLOS, while the MS is in limited service state and either the network does not broadcast the indication of support of RLOS in limited service state, or the EPS attach request for access to RLOS is rejected by the network, or the EPS tracking area update request for access to RLOS is rejected by the network.

Once the MS has registered on a PLMN selected by the user, the MS may automatically register on a different PLMN if:

1. the MS supports MINT;
2. the "list of PLMN(s) to be used in disaster condition" is non-empty;
3. there is no available PLMN which is declared as an equivalent PLMN by the RPLMN; and
4. the RPLMN of the MS is considered as the MS determined PLMN with disaster condition based on the determination of the MS determined PLMN with disaster condition as specified in clause 4.4.3.1.1.

If the user does not select a PLMN (or PLMN and CAG-ID), the selected PLMN shall be the one that was selected before the PLMN selection procedure started. If no such PLMN was selected or that PLMN is no longer available, then the MS shall attempt to camp on any acceptable cell and enter the limited service state. If:

• the MS supports access to RLOS;
• either the UICC containing the USIM is not present in the MS, or the UICC containing the USIM is present in the MS and the MCC part of the IMSI in the USIM is present in the RLOS allowed MCC list configured in the USIM (see TS 31.102) or in the ME (see TS 24.368);
• one or more PLMNs offering access to RLOS has been found;
• registration cannot be achieved on any PLMN; and
• the MS is in limited service state,

the MS indicates the PLMNs offering access to RLOS, presented in the following order:

1. PLMNs contained in the RLOS preferred PLMN list configured in the USIM (see TS 31.102) or in the ME (see TS 24.368) (in priority order) if the MCC part of the preferred PLMN ID is present in the RLOS allowed MCC list configured in the USIM (see TS 31.102) or in the ME (see TS 24.368); and
2. any of the remaining PLMNs offering access to RLOS that are not in the RLOS preferred PLMN list if the MCC part of the PLMN ID is present in the RLOS allowed MCC list configured in the USIM (see TS 31.102) or in the ME (see TS 24.368).

Upon selection of a PLMN by the user, the MS initiates registration for access to RLOS on the PLMN chosen by the user (this may take place at any time during the presentation of PLMNs).

The MS selects and attempts registration on PLMN/access technology combinations, if available and allowable, in all of its bands of operation in accordance with the following order:

1. the HPLMN (if the EHPLMN list is not present or is empty) or the highest priority EHPLMN that is available (if the EHPLMN list is present);
2. PLMN/access technology combinations contained in the "User Controlled PLMN Selector with Access Technology" data file in the SIM (in priority order) excluding the previously selected PLMN/access technology combination;
3. PLMN/access technology combinations contained in the "Operator Controlled PLMN Selector with Access Technology" data file in the SIM (in priority order) or stored in the ME (in priority order) excluding the previously selected PLMN/access technology combination;
4. other PLMN/access technology combinations with the received high quality signal in random order excluding the previously selected PLMN/access technology combination;
5. other PLMN/access technology combinations, excluding the previously selected PLMN/access technology combination in order of decreasing signal quality or, alternatively, the previously selected PLMN/access technology combination may be chosen ignoring its signal quality;
6. The previously selected PLMN/access technology combination.

The previously selected PLMN/access technology combination is the PLMN/access technology combination which the MS has selected prior to the start of the user reselection procedure. The equivalent PLMNs list shall not be applied to the user reselection in Automatic Network Selection Mode. When following the above procedure, the requirements a), b), c), e), f), g), h), j), k), l), m), n), o), p) and v) in clause 4.4.3.1.1 apply: Requirement d) shall apply as shown below:

The Manual Network Selection Mode Procedure clause 4.4.3.1.2 is followed.

The procedure of clause 4.4.3.1.3 is followed.

The procedure of clause 4.4.3.1.3 is followed.