24.3273GPPGeneral Packet Radio System (GPRS) and 3GPP I-WLAN aspectsMobility between 3GPP Wireless Local Area Network (WLAN) interworking (I-WLAN) and 3GPP systemsRelease 12Stage 3TS
When connecting to 3GPP I-WLAN, the UE may request the Home Agent IP address(es) or the Home Network Prefix, or both, by including the corresponding attributes in an IKE_AUTH request message Configuration Payload of type CFG_REQUEST as described below.
Upon receipt of an IKE_AUTH request message containing a request for HA IP address(es) or HNP, or both, and after authorization and authentication with the 3GPP AAA server as described in 3GPP TS 24.234 , and if available in the PDG, the PDG shall provide to the UE at least one of:
– the HA IPv6 address and optionally the HA IPv4 address in the IKE_AUTH response CFG_REPLY Configuration Payload as specified in 3GPP TS 24.302 ; or
– the IPv6 HNP as described in the HNP attribute is defined as MIP6_HOME_PREFIX attribute as described in IETF RFC 5026 .
When the UE wants to have other PDN connections through the same PDG, the UE may discover the HA IP address(es) using DNS as defined in 3GPP TS 24.303 .
Annex C (informative):
Deployment cases for a system acting as home link for a UE