IEEE 802.16m UL Fractional Power Control Document Number: IEEE C802.16m-08/627 Date Submitted: 2008-06-07 Source: Fan Wang, Chandy Sankaran, Amitava Ghosh, Bishwarup Mondal, Mark Cudak, Fred Vook E-mail: fanw@motorola.com Motorola *<http://standards.ieee.org/faqs/affiliationFAQ.html> Venue: TGm – Call for contributions on Project 802.16m System Description Document – IEEE 802.16m-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 802.16m System Description Document Notice: This document does not represent the agreed views of the IEEE 802.16 Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.16. Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: <http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and <http://standards.ieee.org/guides/opman/sect6.html#6.3>. Further information is located at <http://standards.ieee.org/board/pat/pat-material.html> and <http://standards.ieee.org/board/pat >.

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

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

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

Effect on Battery Life

Conclusions Fractional power control scheme can be applied for 802.16m 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