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Transcript
IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-07-0351-00-0000 Title: Inter-Tech Handover Activity Date Submitted: September, 2007 Presented at IEEE 802.21 session #22 Big Island Authors or Source(s): Vivek Gupta Abstract: Update on Handover activities across SDOs and messages/directions for 802.21 1 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 <http://standards.ieee.org/guides/opman/sect6.html#6.3> and in Understanding Patent Issues During IEEE Standards Development http://standards.ieee.org/board/pat/guide.html> 2 802.21 How we Started ? Optimize L3 Handovers – Network Discovery & Selection (ND&S) – Enable Network initiated Handovers – Lower Power Operation Assumptions: – Dual Radio Operation – Make before break as primary mode of operation 3 802.21 - Industry Observations ND&S a big issue only for 802.11 networks – Not such a big issue for other networks operating primarily in licensed bands – Inter-RAT Neighbor Advertisements are good enough – Operators skeptical about dedicated IS server L3 MM Protocols are not widely deployed – CMIP not that widely used – PMIP may not require significant 802.21 services Network initiated HO are compelling – Require significant investments – Done in network specific manner 4 Handovers – Key Issues Co-existence & Interference issues prevent dual radio operation in many UEs Need optimized HO solutions for Single Radio operation (one radio transmitting at a time ONLY…) – May not be able to do Make operation before Break – Need to transition to 3GPP from WiMAX during voice call Key 802 involved Handover Scenarios – WiMAX <> 3GPP2/3GPP – WiMAX <> WiFi 5 Key Elements of Handover Functionality Target Preparation is the Key aspect of Optimized Handovers 6 Capability Motivation Complexity Inter-RAT network advertisements Helps reduce power consumption on the device. Required for single radio operation. The WiMAX module will only turn on if WiMAX coverage is available Low Inter-RAT Traffic Anchoring Eliminates L3 mobility signaling in inter-RAT mobility by keeping L3 anchor in the previous RAT access gateway. Requires inter-RAT interface between access gateways Low-Medium Inter-RAT L2 Handoff Optimization Speeds up handoff procedure (e.g. passing security keys). Requires inter-RAT interface between access gateways Medium Inter-RAT NetworkInitiated Handoff Enables operators to enforce handoff policies and decisions. Requires inter-RAT measurement reporting High WiMAX Reference Diagram Visited NSP R2 Home NSP R2 R3 R1 SS/ MS ASN R5 CSN CSN R4 Another ASN NAP 7 ASP Network OR Internet ASP Network OR Internet WiMAX – R4 Expected to get modified for Inter-Tech Handovers Support Handover Messages – HO_Req – HO_Rsp – HO_Cnf – Context_Transfer – Bearer Path Setup 802.21 HO Messages (HO Flows) should align with those in WMF specs for WiMAX related HOs 8 Generic Inter-RAT Interfaces AG-RAT1 Common Core RAG Mobile Station (MS) WMF-R4 AG-RAT2 9 HLR HSS Inter-RAT Server HA AAA Conclusions Providing a complete solution for WiFi<>WiMAX HOs may be the best value add for 802.21 …..in near term – May need to define few more N2N Handover messages 3GPP has some reservations w.r.t IS servers but 3GPP has accepted providing information about 802 networks over 3GPP RANs Single Radio HO solution is one of the Key Activity in 3GPP – WiMAX<>3GPP/2 10 BackUp 11 SAE Architecture Enhancements for WiMAX Optimized Handoff GERAN SGSN UTRAN S3 S1-MME Sw1 MME SGi WiMAX IWF “LTE-Uu” UE E-UTRAN WiMAX-R1 S5 Serving Gateway X101 WiMAX ASN 12 PDN Gateway S2a SGi Operator's IP Services (e.g. IMS, PSS etc.) Proposed Single-Radio HO Architecture ASN GW Mobile WiMAX IP Access X101 Non-3GPP Networks S2a HPLMN X1 FAF Relay FAF S1MME MME S11 S3 S10 UE Serving GW E-UTRAN S1-U GERAN / UTRAN Operator’s IP services SGSN S5 PDN GW SGi S4 X200 13 X200 interface terminates to an FAF Relay X200 based on L3 tunnel X1: between FAF Relay and FAF/MME (both in the same network) UE does NOT need to discover the FAF Relay in the HPLMN (can be provisioned) X101: Used for 3GPP to mobile WiMAX pre-registration & for NW-initiated HO from mobile WiMAX to 3GPP 3GPP to WiMAX UE/ ME Target WiMAX ASN Source 3GPP Network Source SGSN WiMAX IWF/MME Serving GW PDN GW /HA Uplink & Downlink PDUs (may traverse target SGSN) 1. WiMAX Radio on 2. Decision to perform HO to WiMAX 3. IKEv2 Auth & IPSec Setup 4. Handover Request 5. WiMAX R4 Handover Request 4a. WiMAX DL Sync 6. WiMAX R4 Context Request 7. WiMAX R4 Context Response 8. WiMAX Resource Preparation 9. Proxy Binding Update (PMIP) 10. Proxy Binding Ack (PMIP) 11. WiMAX R4 Handover Response 12. WiMAX R4 Handover Ack 13. Handover Command 14. WiMAX PHY/MAC Establishment Uplink & Downlink PDUs 15. Release 3GPP Resources 14 3. Authentication & Authorization HSS/A AA WiMAX to 3GPP UE/ MS WiMAX ASN Target 3GPP Network Target SGSN WiMAX IWF/MME Serving GW PDN GW /HA Uplink & Downlink PDUs 1. 3GPP Radio on 2. Decision to perform HO to 3GPP 3. IKEv2 Auth & IPSec Setup 3. Authentication & Authorization 4. Handover Request 5. WiMAX R4 Handover Request 6. Rest of 3GPP Attach with the target network 7. Forward Relocation REQ 8. Target SGSN prepares 3GPP access network 9. Forward Relocation RES 10. Create Default Bearer REQ 11. PMIP Proxy BU/ GTP Create Bearer REQ 13. Create Default Bearer RES 14. Handover Command 15. Handover Complete Uplink & Downlink PDUs (may traverse target SGSN) 16. WiMAX R4 Handover Response 17. WiMAX R4 Handover Ack. 18. Release WiMAX Resources 15 12. PMIP Proxy BA/ GTP Create Bearer RES HSS/A AA