Implicit Assignment of PC-A-MAP IE (AWD-15.3.6.5.2.10)
IEEE 802.16 Presentation Submission Template (Rev. 9)
Document Number:
IEEE C802.16m-09/1054
Date Submitted:
2009-07-06
Source:
Jeongho Park, Heewon Kang, Hokyu Choi
Voice:
+82-31-279-7528
E-mail:
jeongho.jh.park@samsung.com
Samsung Electronics Co., Ltd.
416 Maetan-3, Suwon, 443-770, Korea
Re:
IEEE 802.16m-09/0028r1, “Call for Comments and Contributions on Project 802.16m Amendment Content”
Category: AWD-15.3.6.5.2.10
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None
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Discussion and Approval
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TPC Command
• Current AWD defines PC-A-MAP IE
– This IE is TPC command for Closed Loop PC
– PC-A-MAP IE has 2 bit-field
• -0.5dB, 0dB, 0.5dB, 1.0dB
– AMS should interpret this IE as relative value to current
tone power
Closed Loop Power Control
• In FDD Systems
– Active AMS should keep track of short term channel at
least
• For Control Channels
– Guarantee of Target SINR is important
• For Persistent Allocation
– Due to limited set of MCS level, rate control is not appropriate
– Periodic Tx power update by using PC-A-MAP would
prevent abrupt huge Tx power change
How to Assign PC-A-MAP?
• Explicit Way
– FBCH Alloc IE can include a field which indicates the PC-A-MAP
location to a MS
– The field size is dependent on total number of channels per subframes
 overhead increase
• Implicit Way
– By coupling with assignment of UL reference signal, additional explicit
assignment might not be necessary
– One good reference is FBCH allocation
 No overhead increase
• Suggestion is “Implicit Assignment of PC-AMAP”
Implicit Assignment
• FBCH is assigned to AMS in mandatory
• We can exploit FBCH allocation order for PCA-MAP allocation
– BS can estimate UL SINR based on FBCH
– PC-A-MAP field is set based on estimated UL SINR
• PC-A-MAP location can be coupled with
FBCH allocation
Assignment Rule Example (FDD)
• ABS assigns FBCH to AMS#1 in UL subframe#3 with 5ms
– Then, PC-A-MAP is automatically assigned in DL #7
– Exact location in DL#7 is determined by the order of AMS#1’s FBCH
in UL subframe#3
DL
Subframe
#3
DL
Subframe
#4
DL
Subframe
#5
DL
Subframe
#6
DL
Subframe
#7
DL
Subframe
#0
Duration1
UL
Subframe
#2
UL
Subframe
#3
UL
Subframe
#4
UL
Subframe
#5
DL
Subframe
#2
DL
Subframe
#3
DL
Subframe
#4
DL
Subframe
#5
DL
Subframe
#6
DL
Subframe
#7
UL
Subframe
#2
UL
Subframe
#3
UL
Subframe
#4
UL
Subframe
#5
UL
Subframe
#6
UL
Subframe
#7
Duration2
UL
Subframe
#6
UL
Subframe
#7
CQI #2
UL
Subframe
#1
CQI #1
UL
Subframe
#0
DL
Subframe
#1
UL
Subframe
#0
UL
Subframe
#1
CQI #2
DL
Subframe
#2
CQI #1
DL
Subframe
#1
TPC #1
DL
Subframe
#0
(i+1)th frame
TPC #2
i-th frame
Assignment Rule Suggestion
• FDD Systems
Subframe
index
Channe
l index
i
m
q
i + floor[ (m+P/2)/N ]
(floor(m+P/2)) mod N
q
Frame index
FBCH
• Location
TDD Systems
– TBD
PC-A-MAP IE Location
Note
P : period of FBCH (subframe)
N : # of subframes in a frame
Proposed Text
• Insert the following text and Table XX under the table 683- PC-A-MAP
IE format in section 15.3.6.5.2.10 of AWD (10r2)
For FDD systems, when FBCH is assigned to AMS, the corresponding PC-A-MAP shall follow
the assignment location defined in Table XX. In the table, P is Allocation period (p) of Feedback
Allocation A-MAP IE (refer to Table 682) and N is the number of subframes in a frame.
For TDD systems, when FBCH is assigned to AMS, the corresponding PC-A-MAP shall follow
the assignment location defined in TBD.
Table XX-FDD PC-A-MAP Assignment Location
Frame index
Subframe index
Channel index
FBCH Location
i
m
q
PC-A-MAP IE
Location
i + floor[ (m+P/2)/N ]
(floor(m+P/2)) mod N
q