1. IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-07-xxxx-00-0000 Title: Annex A.7 abnormal handover flow Date Submitted: May 24, 2007 Presented at IEEE 802.21 session in Montreal, Canada Authors or Source(s): Junxiang Guo Abstract: This contribution updates Annex A.7 in accordance with the new template and new message names.

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3. Annex A.7 A.7 Handover flow diagram for abnormal cases A.7.1 Example handover flow diagram for abnormal case at the stage of resource availability check When MIH_ MN_HO_Candidate_Query Reponse message indicate the handover initiator to abort handover, the MN will initiate handover process to another suitable target PoA. The following is the handover flow diagram for this case:

4. Annex A.7.1 Figure A-9

5. Annex A.7.2 A.7.2 Example handover flow diagram for abnormal case at the stage of handover resource reservation When MIH_MN_HO_Commit Response indicate the handover initiator to abort handover (Status=Unsuccess) the MN will issue MIH_MN_HO_Commit Request to another suitable target PoA, i.e. MN reuses the previous Resource Availability Query result and needs not repeat this Query process again. The following is the handover flow diagram for this case:

6. Resource Availability Check Annex A.7.2 Mobile NodeServing NetworkOther NetworkCandidate Network 1Candidate Network nOther Network MAC-SMAC-CMIHF MIH User UP Entity MIH User MIH User PoS-SPoA-SPoA-C1PoS-C1 MIH User PoA-CnPoS-Cn MIIS Server UP Entity MIH_MN_HO_Candidate_Query.request MIH_MN_HO_Candidate_Query Request MIH_MN_HO_Candidate_Query.indication MIH_N2N_HO_Query_Resources Response MIH_N2N_HO_Query_Resources.response MIH_N2N_HO_Query_Resources Request MIH_N2N_HO_Query_Resources.indication MIH_N2N_HO_Query_Resources.confirm MIH_N2N_HO_Query_Resources Response MIH_N2N_HO_Query_Resources.indication MIH_N2N_HO_Query_Resources.response MIH_N2N_HO_Query_Resources.confirm MIH_N2N_HO_Query_Resources.request MIH_N2N_HO_Query_Resources Request Handover Decision Made and Information Query for Neighboring Networks Traffic Flow over Serving Network Figure A-10a

7. Resource Availability Check (cont.) Mobile NodeServing NetworkOther NetworkCandidate Network 1Candidate Network nOther Network MAC-SMAC-CMIHF MIH User UP Entity MIH User MIH User PoS-SPoA-SPoA-C1PoS-C1 MIH User PoA-CnPoS-Cn MIIS Server UP Entity Annex A.7.2 MIH_MN_HO_Candidate_Query Response (Handover Ack = TRUE) MIH_MN_HO_Candidate_Query.response MIH_MN_HO_Candidate_Query.confirm MIH_MN_HO_Commit.request MIH_N2N_HO_Commit Request MIH_N2N_HO_Commit.indication MIH_N2N_HO_Commit.response MIH_N2N_HO_Commit Response MIH_N2N_HO_Commit.confirm MIH_MN_HO_Commit Request MIH_MN_HO_Commit.indication MIH_N2N_HO_Commit.request MIH_MN_HO_Commit.response MIH_MN_HO_Commit.confirm MIH_MN_HO_Commit Response (Status=Unsuccess) Resource Reservation (Fail) Figure A-10b

8. Establish new L2 connection, higher layer handover execution Mobile NodeServing NetworkOther NetworkCandidate Network 1Candidate Network nOther Network MAC-SMAC-CMIHF MIH User UP Entity MIH User MIH User PoS-SPoA-SPoA-C1PoS-C1 MIH User PoA-CnPoS-Cn MIIS Server UP Entity Annex A.7.2 MIH_MN_HO_Commit.request MIH_N2N_HO_Commit Request MIH_N2N_HO_Commit.indication MIH_N2N_HO_Commit.response MIH_N2N_HO_Commit Response MIH_N2N_HO_Commit.confirm MIH_MN_HO_Commit Request MIH_MN_HO_Commit.indication MIH_N2N_HO_Commit.request MIH_MN_HO_Commit.response MIH_MN_HO_Commit.confirm MIH_MN_HO_Commit Response (Status=Success) Resource Reservation Re-initiate a resource reservation process to another target network (Success) Traffic Flow Re-established over Target Network n Figure A-10c

9. Thank you!