1. 21-06-0480-00-0000 IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-06-0480-00-0000 Title: Two New Information Elements for facilitating L3 connectivity setup before a handover Date Submitted: January, 9, 2006 Presented at IEEE 802.21 session #12 in Hawaii Authors or Source(s): Qiaobing Xie, Ajoy Singh, Yogesh Bhatt Abstract: This submission proposes two new MIIS information elements that can be used to facilitate L3 connectivity setup before a handover.

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3. 21-06-0480-00-0000 In Section 6.3.2 Information Service Elements, we propose the addition of two new fields to Table 6 “Higher Layer Information Services” (page 48 of P802-21-D00-04): No. Name of Information Element DescriptionComments 4.3DHCP address DHCP IP address in the network that can be contact by a mobile terminal to acquire a new CoA. This is a higher layer capability that could help in inter-subnet handovers. (for IPv6, this is the All_DHCP_Relay_Agents_and_Servers link-local multicast address defined in DHCPv6) 4.4AAA address The AAA server IP address in the network. This is a higher layer capability that could help in inter-subnet handovers.

4. 21-06-0480-00-0000 A Use Case - overlapped coverage from different networks DHCP1/AAA1 DHCP/ AAA DHCP2/ AAA2 Network 3 (UMTS) Network 2 (WiMAX) Network 1 (WiFi) 1 22 3 4 5

5. 21-06-0480-00-0000 1.An MIH enabled multi-modal MS is currently connected to Network 1 (Wi-Fi) and getting services, including MIIS from a serving MIH (not shown), from Network 1 (Wi-Fi). 2.Through the MIIS (or its own monitoring of radio beacons), the MS realizes that it is under simultaneous coverage from a neighboring WiMAX and UMTS networks (Networks 2 and 3). 3.Also through the MIIS, the MS acquires the IP address information of the DHCP and AAA in Networks 2 and 3, respectively, using the new IEs proposed in this contribution. 4.Using the existing L3 connectivity through Network 1, the MS contacts the DHCP/AAA servers in Networks 2 and 3 to acquire IP layer connectivity information (e.g., CoA address, DNS address, default gateway) and performs necessary upper layer negotiations (e.g., AAA negotiation, PPP connection set up). This is done without setting up a PHY/link layer connectivity to Network 2 or Network 3. 5.The MS stores the acquired/negotiated IP configuration and AAA parameters in its MM function. 6.When a handover to one of the neighboring networks becomes necessary, the MM function in the MS can set up the lower layer connectivity to the target network and “bind” this lower layer connectivity to the corresponding upper layer IP/AAA connectivity/configuration that has already been established in steps 4-5. This reduces the latency of the handover. A Use Case - overlapped coverage from different networks (cont.)