1. Clarification on Temporary Identifier of Idle AMS IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE C802.16m-09/0839r2 Date Submitted: 2009-05-03 Source: Dongyao Wang, Kaibin Zhang, Gang Shen, Shan Jin Voice: 86-21-58541240-3712 Alcatel-Lucent Shanghai Bell Email: Dongyao.Wang@alcatel-sbell.com.cnDongyao.Wang@alcatel-sbell.com.cn Ying Du, Daning Gong CATR * http://standards.ieee.org/faqs/affiliationFAQ.html Venue: Re: IEEE 80216m-09_0021, Call for Comments on Project 802.16m System Description Document (SDD) Base Contribution: N/A Purpose: To be discussed and adopted by TGm for the 802.16m SDD Notice: This document does not represent the agreed views of the IEEE 802.16 Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein. Release: 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 802.16. Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and.http://standards.ieee.org/guides/bylaws/sect6-7.html#6http://standards.ieee.org/guides/opman/sect6.html#6.3 Further information is located at and.http://standards.ieee.org/board/pat/pat-material.htmlhttp://standards.ieee.org/board/pat

2. Background Idle State Idle mode provides efficient power saving for the AMS  allowing the AMS to become periodically available for DL broadcast traffic messaging  no registration at ABS is required for AMS  idle mode AMS is assigned to a paging group Temporary Identifier is defined for the idle state for the Privacy  uniquely identify an AMS in the idle mode in a particular paging group  assigned during idle mode entry  updated when location update due to paging group change  used in paging message to identify a AMS  identify itself during network re-entry procedure Enter idle state Assigned Temporary Identifier

3. Problems One ABS may be a member of one or more paging groups Therefore, the following case is possible due to mobility  Both AMS 1 and AMS 2 select the same preferred ABS  AMS 1 and AMS2 belong to the different paging groups  The same Temporary Identifier might be allocated to AMS 1 and AMS 2 in two paging groups independently Collisions occur when the same Temporary Identifier is allocated to two AMSs  to identify a AMS in the paging message, or  in the network re-entry procedure Maybe with the same Temporary Identifier

4. Proposed Solution Ensure ABS not to broadcast the identical Temporary ID to different AMSs even if they belong to the different Paging Groups Two segments for the Temporary Identifier  the first part is defined as the Paging Group ID  the second part is defined as the unique ID in this Paging group PG ID (1 st part) Unique ID (2 nd part) Temporary Identifier Ensure different Temporary Identifiers

5. Proposed text changes to 16m SDD [Change the section 10.5.2.2.1 “Idle mode initiation” of SDD] 10.5.2.2.1 Idle mode initiation An MS or serving BS initiates idle mode using procedures defined in the wirelessMAN-OFDMA Reference system. In order to reduce signaling overhead and provide location privacy, a temporary identifier is assigned to uniquely identify the AMSs in the idle mode in a particular paging group. And the AMS’s temporary identifier contains the PGID information of its paging group. The AMS’s temporary identifier remains valid as long as AMS stays in the same paging group. The temporary identifier assignment may happen during idle mode entry or during location update due to paging group change. Temporary identifier may be used in paging messages or during AMS’s network re-entry procedure.

6. Thanks