1. Signaling Method for Reducing Unnecessary A-MAP Decoding Document Number: C80216m-09/2480 Date Submitted: 2009-11-20 Source: Chieh Yuan Ho, IK Fu, Yu-Hao Chang, Yih-Shen Chen, yuhao.chang@mediatek.com Ching-Yao Huang MediaTek Inc. Venue: IEEE Session #64, Atlanta, USA. Re: Base Contribution: N/A Purpose: To be discussed and adopted by TGm 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. Outline Motivation Simulation Result Proposed Solution Proposed Text

3. Motivation While ABS suffers a really heavy traffic load, apparently an active AMS having DL traffic will not always be served by the ABS in every frame. That means in some consecutive frames, an active AMS might not have any DL traffic at all. Therefore, during the time period when AMS doesn’t have any DL/UL traffic, it still has to decode A-AMAP regions of those consecutive frames, consuming the additional computational power. This effect is obvious in delay-sensitive real-time service.

4. Simulation Result Traffic Model: Near real-time video streaming Scheduling: Proportional Fair 19 cells wrap-up The percentage on the X-axi shows the average portion of the simulation time (frame) when there’s no data traffic assignment for AMS. System Parameter: 10MHz, DL:UL=4:4 PRU:18x6 48 PRU per subframe

5. Simulation Result Traffic Model: Near real-time video streaming Scheduling: Proportional Fair 19 cells wrap-up The percentage on the y-axi shows the average portion of the simulation time (frame) when there’s no data traffic assignment for AMS. System Parameter: 10MHz, DL:UL=4:4 PRU:18x6 48 PRU per subframe

6. Simulation Result Traffic Model: Near real-time video streaming + HTTP Scheduling: Proportional Fair 19 cells wrap-up The percentage on the y-axi shows the average portion of the simulation time (frame) when there’s no data traffic assignment for AMS.

7. Simulation Result Traffic Model: Near real-time video streaming Scheduling: Proportional Fair 19 cells wrap-up The value on the y-axi shows the portion of the simulation time (frame) when AMS could reduce the attempts of decoding A-AMAP regions.

8. Simulation Result Traffic Model: Near real-time video streaming + HTTP Scheduling: Proportional Fair 19 cells wrap-up The value on the y-axi shows the portion of the simulation time (frame) which reduces the unnecessary blind decoding.

9. Proposed Solutions Motivation – Reduce the unnecessary A-AMAP region blind decode attempts In the mean time, in order to minimize the system overhead, a 1-bit Traffic Indication Index (TII) can be added into DL/UL Basic Assignment A-MAP to indicate that whether there’s no assignment to the AMS in all A-AMAP regions of the next frame. Hence, if the Traffic Indication Index shows “1” in n th frame, an active AMS has no need to decode the A-AMAP regions of the (n+1) th frame, and vice versa. Advantage – The signaling method making the minimum change to the A-A-MAP format provides the benefit of significantly reducing the number of unnecessary blind decoding attempts for A-AMAP region, so that it can further reduce AMS power consumption. SyntaxSize in bitsDescription/Notes Traffic Indication Index1No assignment in next consecutive frames including the current one. 0b00: 0 frame 0b01: 1 frames Proposed field format for DL/UL Basic Assignment A-MAP

10. Proposed Text Traffic Indication Index: an indicator to inform AMS there’s no assignment in the next consecutive frames starting from this frame. SyntaxSize in bitsDescription/Notes Traffic Indication Index1No assignment in next consecutive frames including the current one. 0b00: 0 frame 0b01: 1 frame The following text is proposed to be added on Line 17 on Page 326 of Section 15.3.6.5.4.2 of P802.16m/D2.