1. Efficient 16m MAC Addressing IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE C802.16m-08/681r2 Date Submitted: 2008-07-07 Source: Kanchei (Ken) Loa, Yi-Hsueh Tsai, Chun-Yen Hsu, Yung-Ting Lee, Youn-Tai Lee, Hua-Chiang Yin, Institute for Information IndustryE-mail: loa@iii.org.tw Shiann-Tsong Sheu National Central University Whai-En Chen, National Ilan University * http://standards.ieee.org/faqs/affiliationFAQ.html Venue: IEEE 802.16m-08/024- Call for comments and contributions on project 802.16m system description document (SDD) Topic: Upper MAC concepts and methods (addressing) Base Contribution: N/A Purpose: Propose a efficient addressing method 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. Introduction The legacy CID has different meanings depending on the context of its usage [Yair Bourlas’s e-mail on 04/23/2008] : –It is used as SS address in the MAP for resource allocation –It is used as service flow ID in the MAC header To reduce the addressing overhead in the MAP and MAC PDU header, instead of using legacy CID, we propose to use a pair of Station ID (SID) and a Transport ID (TID)

3. Example For example, we can use a pair of 4~12-bit SID and 4-bit TID to replace the legacy 16-bit CID (4-bit SID could be used for femto cell) The MAP only requires 4~12-bit SID as the SS address The PDU MAC header only requires 4-bit TID as the service flow ID During handover, the target BS only need to reassign a 4~12-bit SID, instead of all 16-bit SS CIDs. The TIDs remain the same

4. Legacy Management CID In the legacy 16e, BS will assign a pair of (basic and primary) management CIDs to SS during initial ranging phase. The basic CID is used in the MAP for resource allocation Basic and primary management CIDs reflect the fact that there are inherently different levels of QoS for management traffic between an SS and the BS

5. Proposed Station ID (SID) We propose using a cell-wide unique ID, such as SID (Station ID), instead of using basic CID, to represent a subscriber station in the MAP Since the SID has already appeared in the MAP for target SS identification, the SID in the management MAC PDU header can be eliminated completely, except during CDMA ranging

6. Proposed Station ID (SID) Different levels of QoS (i.e. basic, primary or secondary) for management messages, if necessary, could be indicated in the management MAC PDU header by 2 bits

7. Legacy Transport CID In legacy 16e, in order to establish a service flow, the BS will assign a cell-wide transport CID with an associated access-network-wide unique SFID to SS Then the assigned transport CID will be used as a service flow ID in the MAC PDU header to identify the service flow which the payload is assigned to

8. Proposed Transport ID (TID) We propose that for each service flow of an SS, the BS assigns a subscriber-station-wide unique TID (Transport ID) for that SS. Thus, the SID + TID will uniquely map to the associated SFID in the BS cell

9. Proposed Transport ID (TID) Since the SID has already appeared in the MAP for target SS identification, the MAC PDU header only requires the TID, except during CDMA ranging SID in the MAP + TID in the MAC PDU header uniquely maps to SFID

10. During Handover In legacy 16e, during handover, the target BS have to reassign all SS CIDs including basic + primary management CID and transport CIDs associated with the service flow Since the TID (Transport ID) is subscriber- station-wide unique, it remains unchanged during handover. Thus, the target BS only need to reassign an SID

11. Reduced Generic MAC Header Legacy Generic MAC header requires 16-bit CID for addressing The proposed management MAC PDU header only requires 2 bits for addressing The proposed transport MAC PDU header only requires 4 bits for addressing The size of the Generic MAC header could be reduced or more bits in the MAC header could be reserved for other purposes

12. Conclusions To reduce the addressing overhead, we propose to use a Station ID (SID) in the MAP and a Transport ID (TID) in the MAC header During handover, the target BS only need to reassign an SID, instead of all SS CIDs The size of the Generic MAC header could be reduced or more bits in the MAC header could be reserved for other purposes