1. A DL Control Structure in IEEE 802.16m IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S802.16m-08/207 Date Submitted: 2008-03-18 Source: Sungcheol Chang, Kwangjae Lim, Jaesun Cha, Voice: +82-42-860-5456 Sungkyung Kim, Seokheon Cho, Sunggeun Jin, Hyun Lee, E-mail: {scchang, kjlim, csyoon}@etri.re.kr Chulsik Yoon ETRI 161 Gajeong-dong Yusong-gu Daejeon, Korea Namgi KimE-mail: ngkim@kyonggi.ac.kr Kyonggi University * http://standards.ieee.org/faqs/affiliationFAQ.html Venue: EEE 802.16 Session #54, Orlando, FL, USA Base Contribution: IEEE C802.16m-08/207 Purpose: To discuss and adopt the proposed text in the next revision of 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. Scope and Keys Broadcast Information –Hierarchical structure: fixed and message –Introduction of fixed broadcast channel (BCH) in super-frame header (SFH) –Hybrid structure of channel and messages. –Version, indicators, scheduling of messages DL Control in Sub-Frame –Heading and multiple MAPs (hybrid of joint/per- user coding) –Subslot and blind decoding

3. Broadcast Information

4. Motivations Broadcast Information in the Legacy –Frequent MAP decoding to get broadcast information. –Message-based flat structure Single period to get a broadcast message –Requiring MAP decoding before receiving broadcast message. –Broadcast Control Pointer IE in DL MAP every frame to avoid MS’s decoding all MAPs and broadcast bursts to receive broadcast message

5. Broadcast Information Hierarchy New 16m preamble Hierarchical structure –Broadcast Channel Fast Information Block –Every super-frame Slow Information Block –few tens of super-frame –Broadcast Message Legacy UCD/DCD/NBR- ADV management messages

6. Broadcast Channel (BCH) Fixed broadcast information –No MAP decoding is required Super-frame control functionalities DL radio frame configurations required –to synchronize with the radio frame; –to decode the DL control signaling of resource allocation, –to receive bursts of broadcast messages in downlink.

7. An Example of Parameters in BCH Contents of FIB –Super-frame number LSBs; –Fast frame controls (load control, random access control); –Broadcast message versions (BIB counter, DCD counter, UCD counter, NBR-ADV counter); –Broadcast message change indicators (BIB change indicator, DCD change indicator, UCD change indicator, NBR-ADV change indicator); –Super-frame offsets to indicate broadcast message bursts; –Paging message indicator; –Reserved field; –CRC. Contents of BIB –BIB counter; –Super-frame number MSBs; –Tx configuration; –Frame and DL Sub-frame configuration; –[the maximum number of MAPs, and MAPs’ MCS definition] these may be fixed in the specification; –Multicarrier(wideband) information; –Reserved field; –CRC.

8. Scheduling and Indicators in BCH Current broadcast message version (counters) To reduce MS's MAP decoding every frame –Broadcast message super-frame offsets –Broadcast message change indicators –Paging message indicators

9. A DL Control in Sub-Frame

10. Motivations DL Control in the Legacy –Three steps: FCH -> MAP -> Sub-MAP –MAP message Based on MAP PDU format –Semi-static Information Redundant fixed parameters Region allocations Redundancies in each IE –Only based on joint coding.

11. DL Control Approaches Joint coding (common signaling) –Coding gain and one CRC –Flexible-format MAP IEs for resource allocation and signaling –Variable-size length Per-user coding (dedicated signaling) –Link adaptation gain –CRC with user identification

12. Per-User Coding Variable-size MAP IE –Optimize a required resource for a user or multiple users. –Length Indication is required Fixed-size MAP IE –No length field is required –Redundancy in DL resource allocation

13. Hybrid of joint and per-user codings Heading –MAP Lengths –[MAP MCS] -> blind decoding MAPs –Joint coding –Per-user coding –AMC-controlled / Power-controlled

14. Sub-Slot for DL Control Small resource allocation unit for MAPs –To reduce radio resources for allocating MAPs MAP length in sub-slots –Occupying a small number of normal slots for multiple MAPs due to the multiplexing.

15. Summary Broadcast Information –Hybrid of BCH and legacy broadcast messages –Two blocks with different periods in BCH –Versions, indicators, and scheduling of messages DL Control in Sub-Frame –Hybrid of joint/per-user coding Heading and multiple MAPs –Sub-slot allocation unit for MAPs

16. SDD Texts 11.7 Synchronization 11.8 Broadcast Information 11.9 DL Control Signaling using Heading and MAPs –Please refer to the texts in the contribution