Transcript IEEE C802.16m-09/2480

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,
Ching-Yao Huang
[email protected]
MediaTek Inc.
Venue:
IEEE Session #64, Atlanta, USA.
Re:
Base Contribution:
N/A
Purpose:
To be discussed and adopted by TGm
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Outline
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Motivation
Simulation Result
Proposed Solution
Proposed Text
Motivation
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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.
Simulation Result
System Parameter:
10MHz,
DL:UL=4:4
PRU:18x6
48 PRU per subframe
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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.
Simulation Result
System Parameter:
10MHz,
DL:UL=4:4
PRU:18x6
48 PRU per subframe
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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.
Simulation Result
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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.
Simulation Result
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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.
Simulation Result
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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.
Proposed Solutions
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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 nth frame, an active AMS has no
need to decode the A-AMAP regions of the (n+1) th frame, and vice versa.
Advantage
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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.
Proposed field format for DL/UL Basic Assignment A-MAP
Syntax
Size in bits
Description/Notes
Traffic Indication Index
1
No assignment in next consecutive
frames including the current one.
0b00: 0 frame
0b01: 1 frames
Proposed Text
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.
Syntax
Size in bits
Description/Notes
Traffic Indication Index
1
No assignment in next consecutive
frames including the current one.
0b00: 0 frame
0b01: 1 frame
Traffic Indication Index: an indicator to inform AMS there’s no assignment in
the next consecutive frames starting from this frame.