1. 21-06-xxxx-xx-0000 IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-06-500-02-0000 Title: Network Selection Date Submitted: Apr, 20, 2006 Presented at IEEE 802.21 session #14 Jacksonville Authors or Source(s): Zhuang Hongcheng, Guo Junxiang, Srinivas Sreemanthula Abstract: This document amends MIH_Handover_Initiate message to extend MIH function. it supports multiple network selection.

2. 21-06-xxxx-xx-0000 IEEE 802.21 presentation release statements This document has been prepared to assist the IEEE 802.21 Working Group. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.21. The contributor is familiar with IEEE patent policy, as outlined in Section 6.3 of the IEEE-SA Standards Board Operations Manual and in Understanding Patent Issues During IEEE Standards Development http://standards.ieee.org/board/pat/guide.html> Section 6.3 of the IEEE-SA Standards Board Operations Manualhttp://standards.ieee.org/guides/opman/sect6.html#6.3 http://standards.ieee.org/board/pat/guide.html

3. 21-06-xxxx-xx-0000 Introduction To originate handover, terminal could send a MIH_Handover_Initiate.request message including suggested networks that terminal wants to access to. In some cases, there may exist several networks and PoAs that terminal could handover to and terminal hasn’t enough information to select. If so, MIH_Handover_Initiate.request message should include multiple links instead of single link. MIHF at network may collect information of these links, or others satisfying terminal’s requirements, and send this information to terminal to select one of networks.

4. 21-06-xxxx-xx-0000 In general, a terminal will select the most preferred networks, but in some situation, for example, the terminal energy is not enough to support the most preferred networks when beginning to handover, it will select the less preferred networks, avoiding the corruption of services. In IEEE802.16/WiMAX, there exists network selection negotiation between MS and PoA(BS) by supplying a list of neighbor BSs. Introduction

5. 21-06-xxxx-xx-0000 Amendment of MIH_Handover_Initiate. request Section 7.4.10.1.2 MIH_Handover_Initiate.request MIH_Handover_Initiate.request( SourceIdentifier, DestinationIdentifier, CurrentLinkIdentifier, SuggestedNewLinkIdentifier, SuggestedNewPoAIdentifier, SuggestedNewLinkList, SuggestedNewPoAList, HandoverMode, CurrentLinkAction, QueryResourceList )

6. 21-06-xxxx-xx-0000 Amendment of MIH_Handover_Initiate. request NameTypeValid RangeDescription Source IdentifierIdentifierAny valid individual or group identifier The identifier of entity where the request is initiated. This field may be optionally left empty if the command is local. ………… SuggestedNewLinkListNetworkIdentifier. Can be different 802 and Cellular networks This is the identifier List of new networks to which handover needs to be initiated. The front is most suitable, backward is less. SuggestedNewPoAListMAC_ADDRESS(Optional)This is the Suggested Point of Attachment List (AP/BS) on new networks. The front is most suitable, backward is less. …………

7. 21-06-xxxx-xx-0000 Amendment of MIH_Handover_Initiate. response Section 7.4.10.2.2 MIH_Handover_Initiate.response MIH_Handover_Initiate.response( SourceIdentifier, DestinationIdentifier, CurrentLinkIdentifier, HandoverAck, PreferredLinkIdentifier, PreferedPoAIdentifier, PreferredLinkIdentifierList, PreferedPoAIdentifierList, AbortReason )

8. 21-06-xxxx-xx-0000 Amendment of MIH_Handover_Initiate. response NameTypeValid RangeDescription Source IdentifierIdentifierAny valid individual or group identifier The identifier of entity where the request is initiated. This field may be optionally left empty if the command is local. ………… PreferredLinkListNetworkIdentifier. Can be different 802 and Cellular networks This is the identifier List of new networks to which handover needs to be initiated. This may be different than the network that was suggested in the handover request. The front is most suitable, backward is less. PreferredNewPoAListMAC_ADDRESSThis is the preferred Point of Attachment (AP/BS) List in new network. The front is most suitable, backward is less. …………

9. 21-06-xxxx-xx-0000 Amendment of MIH_Handover_Initiate SyntaxSize (octets) Notes LinkIdentifier1Link Identifier such as 3GPP, 802.16, etc. Num_PoA1The number of PoA For(i=0;i<Num_PoA;i++) { PoA IdentifierVariablePoA Identifier } Specially, for example, if Num_PoA is equal to 2, then the list consists of primary and secondary PoA.