A-MAP Indications in IEEE 802.16m System
Document Number: IEEE C802.16m-09/0973r1
Date Submitted: 2009/05/06
Source:
Chieh-Yuan Ho, Yih-Shen Chen Ming-Hsien Wu,
Ching-Yao Huang, I-Kang Fu, Paul Cheng
NCTU/MediaTek
Email: IK.Fu@mediatek.com
yihshen.chen@mediatek.com
thorpe.ho@mediatek.com
cyhuang@faculty.nctu.edu.tw
Venue: IEEE 802.16 Session#61 at Cairo, Egypt.
Base Contributions: This is base contribution
Re: Category: AWD comments/Area: Chapter 15.3.6 (DL_CTRL)
“Comments on AWD 15.3.6 DL-CTRL”
Purpose: For TGm members’ discussion and approval
Notice:
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1
Introduction (1/2)
• DL and/or UL data assignment may appear in
one of the subframes in one frame
• It is not power efficient to decode all the AMAP IEs in each frame/subframe
– Especially for non-periodic services
• A kind of MAP indication mechanism is
required in multi-subframe resource allocation
2
Introduction (2/2)
• Option A: an A-MAP IE (MAP-IND A-MAP IE) to
indicate the appearance of care-of A-MAPs
• Option B: an extended header to indicate the
appearance of care-of A-MAPs
3
Message Format of MAP_IND A-MAP IE
• AMSs enabling A-MAP Indication are indicated the associated
A-MAP indexes by using their STID and A-MAP bitmap.
Syntax
Size (bit)
Description Notes
A-MAP IE types
4
MAP-IND A-MAP IE
Number of STIDs (N)
TBD
-
STID
TBD
STID for AMS
A-MAP bitmap
variable
Based on DL/UL ratio and number of AMAPs. The value can be obtained in SFH.
For (i=0; i<N; i++)
{
}
Reserved
TBD
Padding
variable
Byte alignment
CRC
16
16 bits CRC
4
Care-of A-MAP Indication Extended Header
• The extended header is sent onto a downlink
“data channel”
• When detecting the header, AMS knows which
A-MAPs to be decode in the following
subframes
• Extended header format
HT
AI
HT: header type
AI: A-MAP indication. Each bit indicates the appearance of
care-of A-MAPs
5
Method Comparison
• Option A:
– Pros:
• The indication appears more dynamically
– Cons:
• Larger signaling overhead
• Option B:
– Pros:
• Less signaling overhead
– Cons:
• The indication is restricted by the transmission timing of DL data
• MS processing time should be considered (2~3 subframes)
• Less scheduling flexibility
6
Proposed Text
• Add a new section:
- 15.3.6.4.2.9 A-MAP indication (MAP_IND) A-MAP IE
The MAP_IND A-MAP IE includes two fields to indicate the station ID (STID) and the care-of
A-MAP indication bitmap, respectively. The size of MAP_IND A-MAP IE is confined to one A-AMAP_IE size.
Syntax
Size (bit)
Description Notes
A-MAP IE types
4
MAP-IND A-MAP IE
Number of STIDs (N)
TBD
-
STID
12
STID for AMS
A-MAP bitmap
3
Based on DL/UL ratio and number of AMAPs. The value can be obtained in SFH.
For (i=0; i<N; i++)
{
}
Reserved
TBD
Padding
variable
Byte alignment
CRC
16
16 bits CRC
7