1. Mobile IPv4 FA CoA Support in WLAN Interworking Raymond Hsu, Qualcomm Inc., rhsu@qualcomm.com Sanket S. Nesargi, Nortel, sanket@nortel.com Nanying Yin, Airvana, nyin@airvananet.com Serge Manning, Sprint, serge.m.manning@mail.sprint.com Notice: Contributors grant free, irrevocable license to 3GPP2 and its Organization Partners to incorporate text or other copyrightable material contained in the contribution and any modifications thereof in the creation of 3GPP2 publications; to copyright and sell in Organizational Partner’s name any Organizational Partner’s standards publication even though it may include portions of the contribution; and at the Organization Partner’s sole discretion to permit others to reproduce in whole or in part such contributions or the resulting Organizational Partner’s standards publication. Contributors are also willing to grant licenses under such contributor copyrights to third parties on reasonable, non-discriminatory terms and conditions for purpose of practicing an Organizational Partner’s standard which incorporates this contribution.This document has been prepared by the contributors to assist the development of specifications by 3GPP2. It is proposed to the Committee as a basis for discussion and is not to be construed as a binding proposal on the contributors. The contributors specifically reserves the right to amend or modify the material contained herein and nothing herein shall be construed as conferring or offering licenses or rights with respect to any intellectual property of the contributors other than provided in the copyright statement above.

2. Why Support FA CoA? There are carriers that only allow the FA CoA mode of operation –MS is enabled to use FA CoA only; thus, PDIF needs to support FA. Same MS behaviors for both WLAN and 1x –FA CoA is the recommended mode in 1x –If FA is not supported in PDIF, MS handoff from 1x to WLAN would have to support the following additional behaviors: Enable D-bit in RRQ Perform IP-IP encapsulation/decapsulation Less transport overhead compared to CCoA –No IP-IP encapsulation between MS and HA Simper address management than CCoA –PDIF is not required to assign IP addresses to MS in FA CoA; on the other hand, PDIF is required to assign an IP address per MS in CCoA. Support dynamic HA/HoA assignment

3. Recommendation Current baseline: –MS should use CCoA. –FA support in PDIF is optional. Recommendation: –MS may use FA CoA or CCoA. –FA support in PDIF is mandatory. “PDIF shall support the FA CoA mode of operation, and the operator may choose to disable it.”