E.6 Trusted non-3GPP Access Network Information

29.2143GPPPolicy and charging control over Rx reference pointRelease 17TS

The PCF provides the AF with the access network information as described in clause 4.4.1, with the following differences:

– The RAT-Type AVP shall be set to "WLAN" and AN-Trusted AVP shall be set to "Trusted" when over the N7 reference point:

a) the received "ratType" attribute is "TRUSTED_WLAN"; or

b) the received "ratType" attribute is "TRUSTED_N3GA" and the "Netloc-Trusted-N3GA" feature is not supported.

– The RAT-Type AVP shall be set to "TRUSTED-N3GA" when the "Netloc-Trusted-N3GA" feature is supported and the received "ratType" attribute over the N7 reference point is "TRUSTED_N3GA".

If the NetLoc-Trusted-WLAN is supported, the procedure described in clauses 4.4.4 and 4.4.6.7 shall apply with the exceptions specified in clause E.1 and with the exception of the user location information that is encoded as follows:

a) The TNAP/TWAP Identifier received over the N7 reference point in the "tnapId"/"twapId" attributes of the "n3gaLocation" attribute, if available, is encoded in the TWAN-Identifier AVP.

NOTE 1: The received SSID, BSSID and Civic Address values, if available, are encoded within the TWAN-Identifier AVP as specified in 3GPP TS 29.061 [34].

b) The UE/N5CW device local IP address (used to reach the TNGF/TWIF) received over the N7 reference point in the "ueIpv4Addr" or "ueIpv6Addr" attribute of the "n3gaLocation" attribute, if available, is encoded in the UE-Local-IP-Address AVP.

c) The UDP source port number received over the N7 reference point in the "portNumber" attribute if available, is encoded within the UDP-Source-Port AVP

NOTE 2: The UDP protocol can be used between the UE and TGNF to enable NAT traversalWhen reporting IP-CAN_CHANGE specific action, the PCF shall, in addition to the IP-CAN-Type AVP and RAT-Type AVP, provide the AN-Trusted AVP set to "Trusted" when the provided and RAT-Type AVP value is "WLAN".