1. 21-10-0114-03-srho 1 IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-10-0xxx-00-srho Title: Overview of Single Radio Handover Procedures of WMF Date Submitted: July 15, 2010 Presented at IEEE 802.21 Authors or Source(s): Yoon-Young An, Junghoon Jee, Hongseok Jeon, Changmin Park, Byungjun Ahn (ETRI) Abstract: Review the Single Radio Handover Procedures in WMF

2. 21-10-0114-03-srho 2 IEEE 802.21 presentation release statements This document has been prepared to assist the IEEE 802.21 Working Group. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.21. The contributor is familiar with IEEE patent policy, as outlined in Section 6.3 of the IEEE-SA Standards Board Operations Manual and in Understanding Patent Issues During IEEE Standards Development http://standards.ieee.org/board/pat/guide.html> Section 6.3 of the IEEE-SA Standards Board Operations Manualhttp://standards.ieee.org/guides/opman/sect6.html#6.3 http://standards.ieee.org/board/pat/guide.html IEEE 802.21 presentation release statements This document has been prepared to assist the IEEE 802.21 Working Group. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.21. The contributor is familiar with IEEE patent policy, as stated in Section 6 of the IEEE-SA Standards Board bylaws and in Understanding Patent Issues During IEEE Standards Development http://standards.ieee.org/board/pat/faq.pdf> Section 6 of the IEEE-SA Standards Board bylawshttp://standards.ieee.org/guides/bylaws/sect6-7.html#6 http://standards.ieee.org/board/pat/faq.pdf

3. 21-10-0114-03-srho WiMAX SR Interworking Architecture WiMAX interworking architecture supports inter-technology handover from non-WiMAX networks (3GPP, 3GPP2, WiFI) to WiMAX Tightly coupled architecture Similar architecture adopted by 3GPP2 for WiMAX to HRPD handover Note: Slide from DCN 21-10-0068-00-0000 3

4. 21-10-0114-03-srho Overall Steps Note: Slide from DCN 21-10-0068-00-0000 4 + HO Preparation

5. 21-10-0114-03-srho 5 Overall SRHO Procedure BS (Target) Serving AP WiMAX Access Network AR/MAG BS (Another Candidate) WiMAX SFF HA/LMA ASN-GW (MAG) MS Peer-MS MIH Information Server Phase 2-2 Phase 1 SFF Discovery Phase 2.1 Pre-registration Phase 2.2 HO Preparation Phase 3 HO Action WiFi Access Network IP Core Network R6 Data Phase1 Phase2-1 R9 Phase 3

6. 21-10-0114-03-srho 6 Phase-1: SR Target Network Detection and WiMAX SFF Discovery Note: Figure from DCN 21-10-0068-00-0000 and the Information Service query is added by referencing DCN 21-10-0005-00-0000 the Information Service query is added by referencing DCN 21-10-0005-00-0000

7. 21-10-0114-03-srho 7 Assumption for Phase 2&3 In case of SRHO from WiFi to WiMAX networks Pre-registered ASN-GW includes Authenticator Target ASN-GW is different from the pre-registered ASN WiMAX forum applied ASN anchored mobility to single radio inter-RAT HO procedures Inter-RAT HO needs IP mobility(MIP, PMIP). CSN anchored mobility has IP mobility function.

8. 21-10-0114-03-srho 8 IKEv2 procedure to setup a secure tunnel Phase-2: SR HO Session Pre-Registration 1. 1.Initial Network Entry Procedure (stage3 4.5.1.1) Data DCD/UCD & BSID Connections Establishment MS-to-Network EAP authentication process WiMAX SFF MS WiMAX Target ASN-GW (MAG) LMA/ HA AAA AP/AR (MAG) WiFi Pre-registered ASN-GW(MAG) /Authenticator Target BS secure tunnel Data Path Establishment MS 802.16e Registration process WIMAX SFF starts to perform BS operation RA(with HNP) IP Address Configuration for WiMAX Interface IP Core Network AAA query with MS ID AAA reply with profile(HNP)

9. 21-10-0114-03-srho 9 Phase-2: SRHO Preparation 2. 2.Active mode HO Preparation Procedure MS-Initiated SRHO Preparation (Refer stage3 4.7.2.1.2) Refer stage3 4.7.2.2.2 OR MOB_MSHO_Ind HO_Cnf HO_Ack MS WiMAXWiFi WiMAX SFF Target ASN-GW (MAG) LMAAAA Pre-registered ASN-GW(MAG) /Authenticator Target BS Data HO_Ack This message initiates a handover to one of the target BSs AP/AR (MAG) IP Core Network MOB_MSHO_Req HO_Req This message have target BS’s information Context retrieve DP Pre-Reg HO_Rsp HO_Req MOB_BSHO_Rsp HO_Ack Context retrieve DP Pre-Reg HO_Rsp HO_Ack MOB_BSHO_Req This message includes one or more potential target BS’s Network- Initiated SRHO Preparation (Refer stage3 4.7.2.1.5)

10. 21-10-0114-03-srho 10 Phase-3: SR Handover Action Network ReEntry PBU PBA Data Successful HO Action Phase MN WiMAXWiFi WiMAX SFF Target ASN-GW (MAG) LMAAAA Target BS Pre-registered ASN-GW(MAG) /Authenticator Anchor_DPF_HO_Trigger Anchor_DPF_HO_Req Anchor_DPF_Relocate_Req Anchor_DPF_Relocate_Rsp Access-Request/MAR Access-Accept/MAA Anchor_DPF_HO_Rsp Anchor_DPF_Relocate_Ack Context_Rpt(Anchor ASN GW ID) Context_Ack AP/AR (MAG) HO Latency in SRHO Bi-Dir tunnel IPv6 session Continuation IP Core Network

11. 21-10-0114-03-srho Key Issues Need SRHO optimization to minimize the packet loss and HO latency How to support the Untrusted WiFi network in SRHO Different Operator’s Network : No SLA(Service Level Agreement) Public WiFi Network Private AP established at Home 11