scope:

This document specifies the stage 2 system description for providing mobility between 3GPP Wireless Local Area Network Interworking (I-WLAN) and 3GPP Systems. It is to define a technical solution based on the working principles of DSMIPv6 (see RFC 5555 [7]) with necessary enhancement of the I-WLAN architecture for supporting mobility and roaming between 3GPP-WLAN Interworking system and 3GPP Systems so that ongoing 3GPP PS based services can be maintained with minimal impact on the end-user's perceived quality on the services at a change of the access network (between I-WLAN and 3GPP Access Systems.

The specification includes both non-roaming and roaming scenarios and covers all aspects, including mobility between 3GPP Systems and I-WLAN with access authentication and charging.