1. 1 IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-06-0677-01-0000 Title: Amendment of the MIH Handover Procedure: LB Issue-# 18 : Comment 495, 915 Date Submitted: September 2006 Presented at IEEE 802.21 session in Melbourne, Australia Authors or Source(s): Junghoon Jee, Eunah Kim, Hongseok Jeon, Vivek Gupta Abstract: This contribution proposes mobile-initiated and network- initiated media independent handover procedures to guide how to use the various handover messages which are defined in the IEEE P802.21/D01.00

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3. 3 Overview  Related Comments : 495, 915  P802-21-D01-00 specifies the handover related messages: MIH_Handover_Initiate Request/Response MIH_Handover_Prepare Request/Response MIH_Handover_Commit Request/Response MIH_Handover_Complete Request/Response  P802-21 allocates an Annex A-1 to specify the handover procedures Currently, only one handover procedure between 802.11 and 3GPP2 is described

4. 4 Issues  We need to have a common view regarding how to utilize the MIH handover related messages. How do these messages complement mobility management protocols such as MIP/SIP? Who is the sender and receiver for each message? When each message is delivered? What effect does a sender expect the receiver to perform by sending a specific message?  General MIH handover procedure needs to be specified. It shall guide how to use the various handover messages.

5. 5 Discussion  MN needs to indicate to Network the QoS requirements MIH_Handover_Initiate.request/response need to be updated appropriately MIH_Handover_Prepare should happen after MIH_Handover_Initiate.request  MIH_Switch needs to be deleted Redundant with MIH_Handover_Initiate  MIH_Commit needs to be exchanged between serving PoS and Target PoS as well  Do we need MIH_Handover_Complete? Is Link_Up on new link not adequate?  Rename commands as follows: MIH_Handover_Initiate => MIH_Candidate_Suggest MIH_Handover_Prepare => MIH_Query_Target_QoS MIH_Handover_Commit => MIH_Candidate_Select

6. 6 Resolutions  -The need for MIH_Handover_Complete Resolution) The MIH_Handover_Complete message exchange between MN and Target PoS is described as "Optional".  -Delete MIH_Switch Resolution) The MIH_Switch will be kept as it is. Any modification and amendment or deletion will be dealt throughout the separate comment resolution process. Related with that, Ulises is preparing the "Link_Switch" command in the upcoming September meeting.  -Description of the Handover procedure Resolution) Basically, definitive languages will be used in describing the handover procedure regarding the exchange of MIH_Handover_Initiate, MIH_Handover_Prepare and MIH_Handover_Commit. This covers the message exchange between the MN and Serving PoS. Moreover, it also applies the message exchange among PoSs. However, when describing the message exchange between Serving PoS and Target PoS, we will use somewhat more flexible language.  Naming of the protocol messages Resolution) We took the "Option 3" which keeps the current naming like MIH_Handover_Initiate, MIH_Handover_Prepare and MIH_Handover_Commit and will add more clarify and precise meaning. More tuning about the message naming can be dealt with separate comment in LB process.

7. 7 Proposal  Accept the remedies as specified in 21-06-06-0677- Handover_Command_Update.doc