IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-08-0117-00-0000 Title: MIH Handover Diagrams Date Submitted: April 17, 2008 Authors or Source(s): Junghoon Jee, Yeonkwon Jeong, Hongseok Jeon, Changmin Park Abstract: The updated handover diagrams for the mobile-initiated and network-initiated cases to resolve the SB Recirculation-2 are provided.

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L.1 Mobile-initiated handover procedure - Description The Mobile-initiated Handover Procedure operates as follows: Mobile Node is connected to the serving network via Current PoS and it has access to MIH Information Server. Mobile Node queries information about neighboring networks by sending the MIH_Get_Information Request to Information Server. Information Server responds with MIH_Get_Information Response. This information query is attempted as soon as Mobile Node is first attached to the network. Mobile Node triggers a mobile-initiated handover by sending MIH_MN_HO_Candidate_Query Request to Serving PoS. This request contains the information of potential candidate networks. Serving PoS queries the availability of resources at the candidate networks by sending MIH_N2N_HO_Query_Resources Request to one or multiple Candidate PoSs. Candidate PoSs respond with MIH_N2N_HO_Query_Resources Response and Serving PoS notifies the Mobile Node of the resulting resource availability at the candidate networks through MIH_MN_HO_Candidate_Query Response. Mobile Node decides the target of the handover and notifies the Serving PoS of the decided target net-work information by sending the MIH_MN_HO_Commit request message. Also, the Mobile Node commits a link switch to the target network interface by invoking the MIH_Link_Actions.request primitive.

L.1 Mobile-initiated handover procedure - Description (cont.) Serving PoS sends the MIH_N2N_HO_Commit Request to Target PoS to request resource preparation at the target network. Target PoS responds the result of the resource preparation by MIH_N2N_HO_Commit Response. The new layer 2 connection is established and a certain mobility management protocol procedures are carried out between Mobile Node and target network. Mobile Node sends MIH_MN_HO_Complete Request to Target PoS. Target PoS sends MIH_N2N_HO_Complete Request to previous Serving PoS to release resource which was allocated to Mobile Node. After identifying that resource is successfully released, Target PoS sends MIH_MN_HO_Complete Response to Mobile Node.

L.1 Mobile-initiated handover procedure - Figure L-1 Mobile Node Serving Network Other Network Candidate Network 1 Candidate Network n Other Network UP Entity MIH User MIHF MAC-S MAC-C PoA-S PoS-S MIH User MIIS Server PoA-C1 PoS-C1 MIH User PoA-Cn PoS-Cn MIH User UP Entity Information Query MIH_Get_Information.request MIH_Get_Information Request MIH_Get_Information Response MIH_Get_Information.confirm Resource Availability Check MIH_MN_HO_Candidate_Query.request MIH_MN_HO_Candidate_Query Request MIH_MN_HO_Candidate_Query.indication MIH_N2N_HO_Query_Resources.request MIH_N2N_HO_Query_Resources Request MIH_N2N_HO_Query_Resources.indication MIH_N2N_HO_Query_Resources.response MIH_N2N_HO_Query_Resources Response MIH_N2N_HO_Query_Resources.confirm MIH_N2N_HO_Query_Resources.request MIH_N2N_HO_Query_Resources Request MIH_N2N_HO_Query_Resources.indication MIH_N2N_HO_Query_Resources.response MIH_N2N_HO_Query_Resources Response MIH_N2N_HO_Query_Resources.confirm

L.1 Mobile-initiated handover procedure (2) - Figure L-1a Mobile Node Serving Network Other Network Candidate Network 1 Candidate Network n Other Network UP Entity MIH User MIHF MAC-S MAC-C PoA-S PoS-S MIH User MIIS Server PoA-C1 PoS-C1 MIH User PoA-Cn PoS-Cn MIH User UP Entity Resource Availability Check (cont.) MIH_MN_HO_Candidate_Query.response MIH_MN_HO_Candidate_Query Response MIH_MN_HO_Candidate_Query.confirm Resource Preparation Establish new L2 connection Using Link_Action.request MIH_MN_HO_Commit.request MIH_MN_HO_Commit Request MIH_MN_HO_Commit.indication MIH_N2N_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.response MIH_MN_HO_Commit Response MIH_MN_HO_Commit.confirm MIH_Link_Actions.request MIH_Link_Actions.confirm

L.1 Mobile-initiated handover procedure (3) - Figure L-1b Mobile Node Serving Network Other Network Candidate Network 1 Candidate Network n Other Network UP Entity MIH User MIHF MAC-S MAC-C PoA-S PoS-S MIH User MIIS Server PoA-C1 PoS-C1 MIH User PoA-Cn PoS-Cn MIH User UP Entity Link Up Indication Link_Up.indication MIH_Link_Up.indication IP connectivity restored Higher Layer Handover Execution Traffic Flow re-established Resource Release MIH_MN_HO_Complete.request MIH_MN_HO_Complete Request MIH_MN_HO_Complete.indication

L.1 Mobile-initiated handover procedure (4) - Figure L-1c Mobile Node Serving Network Other Network Candidate Network 1 Candidate Network n Other Network UP Entity MIH User MIHF MAC-S MAC-C PoA-S PoS-S MIH User MIIS Server PoA-C1 PoS-C1 MIH User PoA-Cn PoS-Cn MIH User UP Entity Resource Release (cont.) MIH_N2N_HO_Complete.request MIH_N2N_HO_Complete Request MIH_N2N_HO_Complete.indication MIH_N2N_HO_Complete.response MIH_N2N_HO_Complete Response MIH_N2N_HO_Complete.confirm MIH_MN_HO_Complete.response MIH_MN_HO_Complete Response MIH_MN_HO_Complete.confirm

L.2 Network-initiated handover procedure - Description The Network-initiated Handover Procedure operates as follows: Serving PoS sends MIH_Get_Information Request to Information Server to get neighboring network information and Information Server responds by sending MIH_Get_Information Response. Serving PoS triggers a network-initiated handover by sending MIH_Net_HO_Candidate_Query Request to Mobile Node. The MN responds through MIH_Net_HO_Candidate_Query Response which contains Mobile Node's acknowledgement about the handover and its preferred link and PoS lists. Serving PoS sends MIH_N2N_HO_Query_Resources Request to one or more Candidate PoSs to check the availability of the resource at candidate networks. Candidate PoS responds by sending MIH_N2N_HO_Query_Resources Response to Serving PoS. Serving PoS decides the target of the handover based on the available resource status at candidate net-works. Serving PoS sends MIH_N2N_HO_Commit Request to Target PoS to prepare resource at the target net-work. Target PoS responds the result of the resource preparation by sending MIH_N2N_HO_Commit Response. After identifying that resource is successfully prepared, Serving PoS commands Mobile Node to commit handover toward the specified network type and PoA through MIH_Net_HO_Commit Request.

L.2 Network-initiated handover procedure - Description (cont.) New layer 2 connection is established and Mobile Node sends MIH_Net_HO_Commit Response to Serv-ing PoS. After higher layer handover execution, Mobile Node sends MIH_MN_HO_Complete Request to Target PoS. Target PoS sends MIH_N2N_HO_Complete Request to previous Serving PoS to release resource which was allocated to Mobile Node. After identifying that resource is successfully released, Target PoS sends MIH_MN_HO_Complete Response to Mobile Node.

L.2 Network-initiated handover procedure -Figure L-2 Mobile Node Serving Network Other Network Candidate Network 1 Candidate Network n Other Network UP Entity MIH User MIHF MAC-S MAC-C PoA-S PoS-S MIH User MIIS Server PoA-C1 PoS-C1 MIH User PoA-Cn PoS-Cn MIH User UP Entity Information Query MIH_Get_Information.request MIH_Get_Information Request MIH_Get_Information Response MIH_Get_Information.confirm Resource Availability Check MIH_Net_HO_Candidate_Query.request MIH_Net_HO_Candidate_Query Request MIH_Net_HO_Candidate_Query.indication MIH_Net_HO_Candidate_Query.response MIH_Net_HO_Candidate_Query Response MIH_Net_HO_Candidate_Query.confirm

L.2 Network-initiated handover procedure -Figure L-2a Mobile Node Serving Network Other Network Candidate Network 1 Candidate Network n Other Network UP Entity MIH User MIHF MAC-S MAC-C PoA-S PoS-S MIH User MIIS Server PoA-C1 PoS-C1 MIH User PoA-Cn PoS-Cn MIH User UP Entity Resource Availability Check (cont.) MIH_N2N_HO_Query_Resources.request MIH_N2N_HO_Query_Resources Request MIH_N2N_HO_Query_Resources.indication MIH_N2N_HO_Query_Resources.response MIH_N2N_HO_Query_Resources Response MIH_N2N_HO_Query_Resources.confirm MIH_N2N_HO_Query_Resources.request MIH_N2N_HO_Query_Resources Request MIH_N2N_HO_Query_Resources.indication MIH_N2N_HO_Query_Resources.response MIH_N2N_HO_Query_Resources Response MIH_N2N_HO_Query_Resources.confirm

L.2 Network-initiated handover procedure -Figure L-2b Mobile Node Serving Network Other Network Candidate Network 1 Candidate Network n Other Network UP Entity MIH User MIHF MAC-S MAC-C PoA-S PoS-S MIH User MIIS Server PoA-C1 PoS-C1 MIH User PoA-Cn PoS-Cn MIH User UP Entity Target Decision Resource Preparation MIH_N2N_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_Net_HO_Commit.request MIH_Net_HO_Commit Request Establish new L2 connection using Link_Action.request MIH_Net_HO_Commit Response (Status = Success) MIH_Net_HO_Commit.confirm

L.2 Network-initiated handover procedure -Figure L-2c Mobile Node Serving Network Other Network Candidate Network 1 Candidate Network n Other Network UP Entity MIH User MIHF MAC-S MAC-C PoA-S PoS-S MIH User MIIS Server PoA-C1 PoS-C1 MIH User PoA-Cn PoS-Cn MIH User UP Entity Link Up Indication Link_Up.indication MIH_Link_Up.indication IP connectivity restored Higher Layer Handover Execution Traffic Flow re-established Resource Release MIH_MN_HO_Complete.request MIH_MN_HO_Complete Request MIH_MN_HO_Complete.indication MIH_N2N_HO_Complete.request MIH_N2N_HO_Complete Request MIH_N2N_HO_Complete.indication MIH_N2N_HO_Complete.response MIH_N2N_HO_Complete Response MIH_N2N_HO_Complete.confirm MIH_MN_HO_Complete.response MIH_MN_HO_Complete Response MIH_MN_HO_Complete.confirm