1. 21-10-0114-03-srho 1 IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-10-0114-03-srho Title: Comments and Questions for Optimized Single Radio Handover Procedures of WMF Date Submitted: July 13, 2010 Presented at IEEE 802.21 Authors or Source(s): Yoon-Young An, Junghoon Jee, Hongseok Jeon, Changmin Park, Byungjun Ahn (ETRI) Abstract: Comments and Questions for Optimized Single Radio Handover Procedures of 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 3 Optimized Single Radio Handover Key Features

4. 21-10-0114-03-srho 4 Pre-Registration over L3 tunnel E.g., WiMAX SFF (Signaling Forwarding Function) performs target BS (Base Station) operations while the MS is located in non-WiMAX Access network MAC messages transfer over L3 tunnel Pre-registration toward target WiMAX network BS (Target) Serving AP ASN-GW (MAG) IP Core Network AR/MAG BS (Another Candidate) WiMAX SFF HA/LMA Data Pre-registration through L3 tunnel ASN-GW (MAG) HO Preparation

5. 21-10-0114-03-srho 5 Review of Detailed Procedures - WiMAX IWK case

6. 21-10-0114-03-srho 6 Overall Steps Note: Figure from DCN 21-10-0068-00-0000 and clarification is marked as blue

7. 21-10-0114-03-srho 7 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

8. 21-10-0114-03-srho 8 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 Apply CSN Anchored Mobility IP mobility protocol  PMIP

9. 21-10-0114-03-srho 9 IKEv2 procedure to setup a secure tunnel Phase-2: SR Handover Session Pre-Registration (1) Phase2 MS_Attachment_Req MS_Attachment_Ack 1. 1.Initial Network Entry Procedure (stage3 4.5.1.1) MS-to-Network EAP authentication Process + IEEE 802.16e registration Data DCD/UCD & BSID Connections Establishment MS-to-Network EAP authentication process MS_Attachment_Rsp WiMAX SFF MS WiMAX Target ASN-GW (MAG) LMA/ HA AAA AP/AR (MAG) WiFi Pre-registered ASN-GW(MAG) /Authenticator IP Core Networ k Information Server Target BS secure tunnel REG_REQ REG_RSP Data Path Establishment RA(with HNP) IP Address Configuration for WiMAX Interface AAA query with MS ID AAA reply with profile(HNP) WIMAX SFF starts to perform BS operation

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

11. 21-10-0114-03-srho 11 Phase-2: Network-initiated SRHO Preparation (2) 2. 2.Active mode HO Preparation Procedure Successful HO Preparation Phase (stage3 4.7.2.1.2) Context retrieve DP Pre-Reg. HO_Rsp MOB_BSHO_REQ Successful HO Action Phase (stage3 4.7.2.2.2) HO_Ack MOB_MSHO_Ind HO_Cnf HO_Ack MS WiMAXWiFi HO_Req WiMAX SFF Target ASN-GW (MAG) LMAAAA Pre-registered ASN-GW(MAG) /Authenticator Information Server HO_Ack This message initiates a handover to one of the target BSs AP/AR (MAG) This message includes one or more potential target BS’s IP Core Network Pseudo Active Timer Expire Information Server query and response Target BS Data HO_Req HO_Rsp HO_Ack

12. 21-10-0114-03-srho Comments for Phase 2 During Active Mode HO Preparation procedure, suddenly WiFi link is disconnected. WiMAX interface of MS will perform the normal attachment procedure. We have to consider the reactive mode process. 12

13. 21-10-0114-03-srho 13 Phase-3: SR Handover Action Network ReEntry PBU PBA Data Successful HO Action Phase (stage3 4.8.5.5) Current State  Active State MS WiMAXWiFi WiMAX SFF Target ASN-GW (MAG) LMAAAA Information Server 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 IP Core Network

14. 21-10-0114-03-srho 14 Comments for Phase 3 WiMAX forum applied ASN anchored mobility(state 3 4.7) to single radio inter-RAT HO procedures Inter-RAT HO needs IP mobility(MIP, PMIP). CSN anchored mobility has IP mobility function.