1. IEEE 802.16m UL Fractional Power Control
Document Number:
IEEE C802.16m-08/627
Date Submitted:
Source:
Fan Wang, Chandy Sankaran, Amitava Ghosh, Bishwarup Mondal, Mark Cudak, Fred Vook
Motorola
*<
Venue:
TGm – Call for contributions on Project m System Description Document – IEEE m-08/024
(interference mitigation)
(Power control)
Base Contribution:
Abstract:
Proposal for 16m uplink power control and uplink interference mitigation.
Purpose:
Adoption of proposed text/content for m System Description Document
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2. Fractional Power Control Scheme
1>>0 is the PC fraction for MSs with bad channel and MSs with good channel.
=0  All MSs transmit at full power: high interference level and poor edge performance.
=1  Traditional slow power control: all MSs received at the same power with poor spectral efficiency.
 can be adjusted based on e.g. IoT, UL performance etc. of neighbor cells for good edge coverage performance and high spectral efficiency.
See contribution C802.16m-08/625

3. Fractional Power Control Illustration
PMAX
(PMAX * RMIN)
L = Lx-ile
Pathloss (L)
Mobile Tx Power (Pt)
Pathloss CDF
0.5 1
Full power
α = 0
α = 0.6
α = 0.7
α = 1
CDF curve
(Lx-ile/L)α = RMIN
Mobile Tx power for different α`s
cell edge users

4. Performance Evaluation
Power Control Scheme
Sector Throughput
Cell Edge Throughput
Mean IoT (dB)
 = 0
1.7 Mbps
7 Kbps
19.9
 = 0.7
1.4 Mbps
52 Kbps
9.7
Significant reduction of IoT
Significant improvement of cell edge throughput
Slightly reduction of sector throughput

5. Effect on Battery Life

6. Conclusions
Fractional power control scheme can be applied for m UL power control and interference mitigation
Significant gains in term of simultaneous cell edge performance and sector throughput over regular and full power schemes.
Tightly control of IoT is achievable through fractional power control