1. Text Proposal of PC-A-MAP IE Assignment in IEEE802. 16 D3 (16. 3. 6. 5
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2. UL Transmit Power Control (TPC)
Current AWD defines PC-A-MAP IE
This IE is TPC command for TX power correction
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

3. 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
Guarantee of Target PER is important
Periodic Tx power update by using PC-A-MAP would prevent abrupt huge Tx power change

4. How to Assign PC-A-MAP? Explicit Way Implicit 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-A-MAP”

5. FBCH is assigned to AMS in mandatory
Implicit Assignment
FBCH is assigned to AMS in mandatory
We can exploit FBCH allocation order for PC-A-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

6. Answers to Concerns on Implicit Way
Period of PC-A-MAP
Same period with FBCH period is not inappropriate?
The more frequent PC-A-MAP than FBCH would be meaningless if there is no UL reference signal for UL SINR estimation
Therefore, same period with FBCH is what PC-A-MAP can have at most if there is not any other UL reference signal
The less frequent PC-A-MAP than FBCH would result in lack of information for power control on FBCH transmission
Overhead PC-A-MAP IE of the proposal
This proposal request all MSs who transmits FBCH to be assigned PC-A-MAP
Considering 320 users per sector and FDD frame with 8 subframes, 40 users per subframe need to be assigned PC-A-MAP
This results in total 160 tones per subframe ( 4 tones x 4 users ) which would occupy less than 1.5 LRU

7. 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

8. Assignment Rule Suggestion
FDD Systems
TDD Systems
TBD
Frame index
Subframe index
Channel index
Note
FBCH Location i m q
PC-A-MAP IE Location
i + floor[ (m+P/2)/N ]
(floor(m+P/2)) mod N
P : period of FBCH (subframe)
N : # of subframes in a frame

9. Proposed Text
Insert the following text and Table XX in page 394, line 56 of IEEEP802.16m/D3 (under the Table 810- PC-A-MAP IE format)
For FDD systems, when FBCH is assigned to AMS, the corresponding PC-A-MAP IE to the AMS automatically follows the assignment location defined in Table XX. In the table, P is allocation period of FBCH by Feedback Allocation A-MAP IE (refer to Table 818-Feedback Allocation A-MAP IE) in terms of subframe. And N is the available number of subframes in a frame.
For TDD systems, when FBCH is assigned to AMS, the corresponding PC-A-MAP automatically follows the assignment location defined in TBD.
Table XX- PC-A-MAP IE Location in FDD systems
Frame index
Subframe index
Channel/IE index
FBCH Location i m q
PC-A-MAP IE Location
i + floor[ (m+P/2)/N ]
(floor(m+P/2)) mod N