1. Clarification on Power Level Adjustment in RNG-ACK for initial power control (16.3.9.4.4, 16.2.3.3 )
IEEE Presentation Submission Template (Rev. 9)
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IEEE C802.16m-10/0586r2
Date Submitted:
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Jeongho Park, Hokyu Choi Voice:
Samsung Electronics Co., Ltd
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IEEE /0032, “IEEE Working Group Letter Ballot Recirc #31a: Announcement”
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Discussion and Approval for D6
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2. RNG-ACK Usage during INE UL Power Control
Power Level Adjustment Indication
This field is going to be used for Uplink Power Correction during Initial RNG Procedure
If received power is above the sufficient power and time/freq. offset is not satisfactory, ‘continue’ mode is performed
In this case, this field can be used for BS to decrease or increase the MS’s RNG power so that it does not cause strong interference or it makes reception more reliable at next ranging transmission

3. D5 Status and Suggestion
No definition of Field and Usage description
Initial RNG Power Ramping is with 2dB size step
Suggestion
To define “Power Level Adjustment” field in RNG-ACK
adjustment range is from -8 dB to 8 dB with 1 dB step (4bit)
0b = -8 dB
0b111111= 8 dB
0dB is excluded (this can be captured by setting API#1 to 0)
To provide clarification of initial ranging power control operation for continue mode
If AMS receives RNG-ACK corresponding its ranging transmission, it stops ramping up its power
If RNG-ACK has API#1=0, it shall keep its previous power
If RNG-ACK has API#1=1, it shall apply “power level adjustment” to its previous power for next ranging transmission

4. Proposed Text (1/2) Remedy #1 : Change the line 52~56 in page 86 as
Timing offset adjustment 5
Time offset adjustment
Amount of advance time required to adjust AMS transmission.
Signed in units of 1/Fs
It shall be included for the specific user when Unicast indication =0 and RNG-ACK bitmap=1 and number of received codes > 0 and and API bit #0 = 1
Or it shall be included for the specific user when Unicast indication =1 and API bit #0 = 1
Power level adjustment 4
Power level adjustment which expresses the change in power level (in multiples of 1 dB) that the
MS shall apply to its current transmission power for initial ranging.
The bit size represents power level correction in the set {-8, -7, -6, -5, -4, -3, -2, -1, +1, +2, +3, +4, +5, +6, +7, +8} which corresponds 0b0000 to 0b1111.
It shall be included for the specific user when RNG-ACK bitmap=1 and number of received codes > 0 and and API bit #1 = 1and Ranging Status = 0b10.

5. Proposed Text (2/2)
Remedy #2 : Add the following sentence in line 26 in page 729
If AMS receives RNG-ACK without power adjustment (power level adjustment indication bit equal 0) as response to the corresponding ranging code transmitted by the AMS, the AMS shall use its latest ranging transmission power as the initial power level for next ranging transmission. And the power ramping up will be performed if there is no response for new transmission.
If RNG-ACK has power level adjustment indication bit with 1, transmission power for continue mode shall base the power used for the latest ranging and the AMS shall adjust it by amount of power level adjustment field of RNG-ACK. The adjusted power level will be used as the initial power level for next ranging transmission, and the power ramping up will be performed if no response for new transmission.