• 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.
21-06-0480-00-0000
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•
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
Description
4.3
DHCP address
DHCP IP address in the network that
can be contact by a mobile terminal
to acquire a new CoA.
4.4
AAA address
The AAA server IP address in the
network.
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Comments
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)
This is a higher layer capability that could help in
inter-subnet handovers.
A Use Case - overlapped coverage from different networks
Network 3 (UMTS)
DHCP1/AAA1
Network 2 (WiMAX)
2
2
1
DHCP2/
AAA2
3
5
4
DHCP/
AAA
Network 1 (WiFi)
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A Use Case - overlapped coverage from different networks (cont.)
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.
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