Transient BCE for Proxy Mobile IPv6 draft-liebsch-netlmm-transient-bce-pmipv6-01.txt Oliver Marco Ahmad MIPSHOP session 29 th July 2008 IETF#72, Dublin

Overview Transient BCE  Extension to Proxy MIPv6 base protocol for handover optimization Joint effort to specify an efficient solution from individual contributions – draft-blume-netlmm-secondary-bce-proxymip6ho-00 – draft-liebsch-netlmm-intertech-proxymip6ho-01 – draft-muhanna-netlmm-pmipv6-support-transient-coa-01 Provides optimization for inter-MAG handoff, e.g. for 3GPP use cases

Design goals Low added complexity Avoid new messages and protocol interfaces –No additional SAs required Meet requirements for a variety of handover cases Approach: –Allow utilizing both previous and new connectivity as available during HO –Synchronize downlink path switch with HO characteristics

Use Cases HO with previous downlink still available –Controlled late path switch –Dual radio (inter-technology) –Single radio with RAT specific forwarding  re-use existing handover optimization Handling of late uplink packets after HO –Support forwarding of packets on the fly from pMAG after HO

Characteristics of a transient BCE Single option attached to Proxy BU (new MAG – LMA) Advanced BCE management on LMA –Maintains temporarily 2 forwarding entries in the MN‘s BCE Ensures forwarding of uplink packets from both links (pMAG and nMAG) Enables controlled forwarding of downlink packets (pMAG or nMAG) to suit various handover cases Suitable for inter-technology and intra-technology handover

Single radio handover with tBCE– re-use 3GPP optimized handover MN IF nMAGpMAGLMA MN pMAG (dl,ul) nMAG (ul) MNpMAG (dl,ul) Attach PBU (TBoption) PBA (TBoption, HNP) PBU PBA MNnMAG (dl,ul) [HO Event] [HO Complete] Forwarding below MAGs in the 3GPP access network, re-use 3GPP optimized handover Transient Active

Inter-technology handover – Handover 3GPP to ePDG MN IF1IF2 pMAGnMAGLMA MNpMAG Attach PBU PBA (HNP)  IKEv2 configuration payload(HNP), Address Configuration MNnMAG [HO Event] [HO Complete] IKEv2 init IP-CAN Session Modification IPsec

Inter-technology handover with tBCE MN IF1IF2 pMAGnMAGLMA MN pMAG (dl,ul) nMAG (ul) MNpMAG (dl,ul) Attach PBU (TBoption) PBA (TBoption, HNP) PBU PBA  IKEv2 configuration payload(HNP), Address Configuration MNnMAG (dl,ul) MN pMAG (ul) nMAG (dl,ul) Activate Transient [HO Event] [HO Complete] Active IKEv2 init IPsec

Co-existence with PFMIP Co-existence –Mechanisms can coexist –Different use cases tBCE –For dual radio / inter-RAT HO (no forwarding required) –For intra-RAT HO with access specific fowarding scheme –No MAG-MAG communication PFMIP –For single radio / intra-RAT HO –Provides a generic IP based forwarding/context transfer –Utilizes forwarding in meshed network architecture

Summary Transient BCE as simple extension to PMIPv6 base protocol –Re-uses existing protocol interfaces –Utilizes new message option: Transient Binding option Smooth migration in PMIPv6 deployment –Only involves nMAG and LMA –No interaction of pMAG and nMAG –No new SAs required, re-use existing SAs between MAG and LMA Tailors U-plane handover procedure to various scenarios –Avoids dropping of packets on previous link –Avoids buffering on target link –Doesn‘t require synchronisation of MN and network Complementary to PFMIP approach –Allows co-existence to suit inter- as well as intra-technology handovers

Way forward... Transient BCE for PMIPv6 as work item in MIPSHOP? Submission of Transient BCE for PMIPv6 to 3GPP

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