Content for TS 24.502 Word version: 19.0.0

1… 4… 5… 5.3B… 6… 7… 7.2.5… 7.3… 7.3A… 7.4… 7.6… 7.9… 7.10… 8… 9… 9.3… 9.3.2… 9.3.2.2.3… 9.3.3…

5.3B PLMN selection procedures using wireline access 5.3C PLMN selection procedures for 5G NSWO 5.3D SNPN selection procedures using trusted non-3GPP access 5.3D.1 General 5.3D.2 SNPN solicitation 5.3D.3 Manual SNPN selection mode procedure 5.3D.4 Automatic mode SNPN selection procedure 5.3D.5 Automatic SNPN selection procedure for onboarding services in SNPN over trusted non-3GPP access 5.3E PLMN selection procedures using untrusted non-3GPP access 5.3F SNPN selection procedures using untrusted non-3GPP access 5.3G SNPN selection procedures using wireline access 5.3H SNPN selection procedures for 5G NSWO 5.4 Access network reselection procedure 5.4.1 General 5.4.2 WLAN reselection procedure
...

5.3B PLMN selection procedures using wireline access |R16| p. 25

Roaming support for wireline access is not defined in the present version of the present document.

The 5G-RG, the W-AGF acting on behalf of the FN-RG and the W-AGF acting on behalf of the N5GC device shall consider that the HPLMN is available on each wireline access network and shall select HPLMN on the wireline access network.

5.3C PLMN selection procedures for 5G NSWO |R17| p. 25

The UE shall select a PLMN to authenticate with for 5G NSWO by performing the following steps:

select a WLAN using the procedure specified in subclause 5.3.2; and
select:
1. the HPLMN, if the HPLMN is in the PLMN list with AAA connectivity to 5GC IE (Annex H in TS 24.302) provided by the selected WLAN; and
2. one of the PLMNs in the PLMN list with AAA connectivity to 5GC IE provided by the selected WLAN, if the HPLMN is not in the PLMN list with AAA connectivity to 5GC IE provided by the selected WLAN.

5.3D SNPN selection procedures using trusted non-3GPP access |R18| p. 26

5.3D.1 General p. 26

When the UE is operating in SNPN access operation mode there are two modes of SNPN selection, namely, manual SNPN selection and automatic SNPN selection.

The UE follows one of the following two procedures defined in clause 5.3.2.2 and clause 5.3.2.3 depending on its implementation. The N5CW device that is not registered or cannot register via NG-RAN performs manual mode WLAN selection procedure as defined in clause 5.3.2.2.

The SNPN is selected in accordance with these procedures determines the WLAN that is selected. When the selected WLAN is a trusted non-3GPP IP access and the UE decides to access 5GC via trusted non-3GPP IP access, the UE shall derive a NAI from the identity of the selected SNPN and use the NAI as the identity for authentication and authorization with the SNPN and usage of the WLAN.

The procedures described in this clause 5.3D shall apply to the UE and the N5CW device.

5.3D.2 SNPN solicitation p. 26

The UE operating in SNPN access operation mode shall determine which SNPNs are available from each WLAN on the list of available WLANs constructed using the WLAN selection procedure described in clause 5.3.2 using the following procedures:

the UE selects a WLAN from the list of selected WLAN(s) constructed using the WLAN selection procedure described in clause 5.3.2;

NOTE 1:
An N5CW device that is not registered or cannot register via NG-RAN uses only the manual mode WLAN selection procedure described in clause 5.3.2.2.
if both the WLAN selected in step i) and the UE support ANQP specified in IEEE Std 802.11 [19] and if the UE did not obtain a list of realms using ANQP in clause 5.3.2.3 item 1, the UE shall send an ANQP request for a list of realms (i.e. ANQP-elements "NAI Realm"), SNPN identities (i.e. ANQP-element "3GPP Cellular Network"), or both; and

NOTE 2:
The UE uses procedures defined in IEEE Std 802.11 [19] to determine if the WLAN supports ANQP and to send the ANQP request for ANQP-elements "NAI Realm", "3GPP Cellular Network", or both, as specified in IEEE Std 802.11 [19].
if either the WLAN selected in step i) or the UE does not support ANQP (see IEEE Std 802.11 [19]) or the UE does not receive a list of realms in item ii), an EAP-Request/Identity is received and the EAP-Request/Identity does not include one or more of realms and SNPN identities (encoded in accordance with RFC 4284), the UE supports IEEE 802.1x authentication (see IEEE Std 802.1X™ [30]), the UE shall request a list of realms, SNPN identities, or both interworking with that WLAN by sending the EAP-Response/Identity message including as identity the alternative NAI; and
the UE repeats this procedure for all WLANs from the available list of WLANs as constructed using the WLAN selection procedure described in clause 5.3.2.

The UE shall convert any received SNPN identities into realms of the SNPNs using the rules defined in clause 19 and clause 28 of TS 23.003. The N5CW device shall convert any received SNPN identities into realms of the SNPNs using the rules defined in clause 28 of TS 23.003.

5.3D.3 Manual SNPN selection mode procedure p. 26

The UE operating in SNPN access operation mode:

select one entry in the "list of subscriber data", if any, or the PLMN subscription, if any, to be used for manual mode SNPN selection. How the UE selects the entry in the "list of subscriber data" or the PLMN subscription is UE implementation specific; and
indicate to the user the SNPNs which are available via the WLAN. The UE may obtain the SNPNs available for WLAN access using procedures as described in clause 5.3D.2. The UE selects the SNPN based on the user preference.

5.3D.4 Automatic mode SNPN selection procedure p. 27

5.3D.4.1 General p. 27

The purpose of this procedure is for the UE operating in SNPN access operation mode to:

select an SNPN over WLAN; and
construct a NAI for use with authentication signalling with the selected SNPN in order for the UE to be authorised to use the WLAN.

The UE shall select one entry in the "list of subscriber data", if any, or the PLMN subscription, if any, to be used for automatic mode SNPN selection. How the UE selects the entry in the "list of subscriber data" or the PLMN subscription is UE implementation specific.

Until the highest priority SNPN is found, the UE shall verify if a SNPN available over a WLAN of the selected WLAN(s) is the highest priority SNPN:

using the SNPNs which are available for WLAN as described in clause 5.3D.2, the UE uses the realms of the SNPN in the remaining steps of this clause;
if the UE is registered over 3GPP access, the realm of the RSNPN of the 3GPP access is included in the list of realms created in clause 5.3D.2, if the realm of the RSNPN of the 3GPP access does not match a realm converted from any SNPN ID in the "temporarily forbidden SNPNs" list for non-3GPP access or "permanently forbidden SNPNs" list for non-3GPP access associated with the selected entry of the "list of subscriber data" or the selected PLMN subscription, then the UE shall select the RSNPN of the 3GPP access;
if the condition in step 2) is not satisfied, the UE shall select, in priority order, an SNPN from the list of realms created in clause 5.3D.2, if:
1. the SNPN identified by an SNPN identity of the subscribed SNPN in the selected entry of the "list of subscriber data";
2. if the UE supports access to an SNPN using credentials from a credentials holder, using the SNPN selection parameters in the selected entry of the "list of subscriber data" or associated with the selected PLMN subscription:
  1. each SNPN indicating that access using credentials from a credentials holder is supported and which is identified by an SNPN identity contained in the user controlled prioritized list of preferred SNPNs (in priority order);
  2. each SNPN indicating that access using credentials from a credentials holder is supported and which is identified by an SNPN identity contained in the credentials holder controlled prioritized list of preferred SNPNs (in priority order);
  3. each SNPN indicating that access using credentials from a credentials holder is supported and indicating a GIN contained in the credentials holder controlled prioritized list of GINs (in priority order). If more than one such SNPN indicate the same GIN, the priority order is UE implementation specific;
  4. each SNPN identified by an SNPN identity which is included neither in the SNPN selection parameters of the entries of the "list of subscriber data" nor in the SNPN selection parameters associated with the PLMN subscription, which does not indicate a GIN which is included in the credentials holder controlled prioritized list of GINs, and which indicates that the SNPN allows registration attempts from UEs that are not explicitly configured to select the SNPN. If more than one such SNPN is available, the order in which the UE attempts registration on those SNPNs is UE implementation specific.

The UE shall construct a NAI for authentication with the highest priority SNPN as follows:

if the selected type of trusted connectivity is 5G connectivity using trusted non-3GPP access and:
1. the selected SNPN is from a list of SNPNs obtained from the SNPN List with trusted 5G Connectivity IE (see Annex H of TS 24.302); or
2. the selected SNPN is from a list of realms obtained using RFC 4284;
then the UE constructs a NAI as specified in clause 28.7.6 of TS 23.003; or
if the selected type of trusted connectivity is 5G connectivity without NAS using trusted non-3GPP access and:
1. the selected SNPN is from a list of SNPNs obtained from the SNPN List with trusted 5G Connectivity-without-NAS IE (see Annex H of TS 24.302); or
2. the selected SNPN is from a list of realms obtained using RFC 4284;
then the UE constructs a NAI as specified in clause 28.7.7 of TS 23.003.

5.3D.5 Automatic SNPN selection procedure for onboarding services in SNPN over trusted non-3GPP access p. 28

If the UE is operating in SNPN access operation mode over trusted non-3GPP access, the UE shall follow these steps:

use procedures defined in subclause 5.3.2.3 to discover available WLANs;

NOTE:
The available WLANs advertise the SNPN(s) towards which the 5G connectivity using trusted non-3GPP access is supported as described in subclause 5.3.2.3. If an SNPN supports onboarding services in SNPN (i.e. the SNPN can be used as ON-SNPN) the WLAN providing access to the SNPN provides an indication (e.g. via ANQP) that onboarding is allowed as described in TS 24.302 Annex H.
select an SNPN if the SNPN indicates that onboarding is allowed and the SNPN matches the optional pre-configured onboarding SNPN selection information. The contents of the onboarding SNPN selection information are UE implementation specific; and
performs initial registration for onboarding services in the SNPN. If the registration fails, the UE may select and can attempt to perform initial registration for onboarding services in a different SNPN that indicates onboarding is allowed and the SNPN matches the optional pre-configured onboarding SNPN selection information.

5.3E PLMN selection procedures using untrusted non-3GPP access |R18| p. 28

Selection of a PLMN over untrusted non-3GPP access is documented in subclause 7.2.

5.3F SNPN selection procedures using untrusted non-3GPP access |R18| p. 28

Selection of an SNPN over untrusted non-3GPP access is documented in subclause 7.2.

5.3G SNPN selection procedures using wireline access |R18| p. 29

Selection of non-subscribed SNPN over wireline access is not defined in the present version of the present document.

The 5G-RG and the W-AGF acting on behalf of the FN-CRG shall consider that the subscribed SNPN is available on each wireline access network and shall select the subscribed SNPN on the wireline access network.

5.3H SNPN selection procedures for 5G NSWO |R18| p. 29

The UE operating in SNPN access operation mode for 5G NSWO shall select:

the registered SNPN, if the WLAN is selected according to step b) 3) iv) I) of clause 5.3.2.3;
the subscribed SNPN, if the WLAN is selected according to step b) 3) iv) II) of clause 5.3.2.3; or
the SNPN corresponding to the SNPN identity used in step b) 3) iv) III) of clause 5.3.2.3, if the WLAN is selected according to step b) 3) iv) III) of clause 5.3.2.3.

5.4 Access network reselection procedure p. 29

5.4.1 General p. 29

The access network reselection procedure can be triggered based on the user's request or the operator's policy. Such operator policy for supporting network reselection can be provided by the ANDSP or can be pre-provisioned in the UE.

The access network reselection procedure can also be triggered by the UE during periodical re-evaluation of ANDSP policies (see clause 6.4.2), or if the 'active' rule becomes invalid (conditions no longer fulfilled), or other manufacturer specific trigger.

5.4.2 WLAN reselection procedure p. 29

For WLAN access network reselection, the UE configured with a WLANSP rule shall use the access network selection procedure as specified in clause 5.3.2. The UE first uses WLAN Selection Policy (WLANSP) to determine the active WLANSP rule. The UE selects the highest priority and valid WLANSP rule as the active WLANSP rule.

The access network reselection procedure can be in automatic mode or manual mode. The manual mode reselection shall follow the behaviour described in clause 5.3.2.3 and the automatic mode reselection shall follow the behaviour described in clause 5.3.2.4.