Uplink Interference Coordination/Control for 802.16m Document Number: IEEE S802.16m-07_278, Date Submitted: 2007-11-07 Source: Fan Wang, Amitava Ghosh,

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Uplink Interference Coordination/Control for m Document Number: IEEE S802.16m-07_278, Date Submitted: Source: Fan Wang, Amitava Ghosh, Chandy Sankaran {fanw, amitava.ghosh, Motorola Re: TGm Call for comments on SDD, IEEE m-07/040 Abstract: Discussed the functional of uplink interference coordination and control for m Purpose: Discussion and adoption of functional area into SDD outline Notice: This document does not represent the agreed views of the IEEE 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 IEEEs name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEEs 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 Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and. Further information is located at and.

VTC Fall, September 2006 MOTOROLA and the Stylized M Logo are registered in the US Patent & Trademark Office. All other product or service names are the property of their respective owners. © Motorola, Inc UL Interference Coordination/Control IoT control is critical for m MS battery life Cell edge coverage/performance Fractional power control (FPC) compensates a fraction of the path loss and shadowing Tradeoff between cell edge performance and overall sector SE To tightly control IoT, neighbor APs need to share uplink performance metric e.g. IoT, UL quality etc. Through Backhaul message AP then adapts the parameters of FPC formula and broadcast them to the UEs UL interference control can be done through Each AP sends slow updates to power control UL transmission. E.g. using UL grant message Alternatively, each MS can derive its own transmission power and MCS according to the path loss measurement from downlink pilot.

VTC Fall, September 2006 MOTOROLA and the Stylized M Logo are registered in the US Patent & Trademark Office. All other product or service names are the property of their respective owners. © Motorola, Inc Fractional Power Control Scheme x-percentile Path Loss Path Loss Maximum Transmit Power Minimum Power Reduction Ratio Fraction Assigned Transmit Power 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. MSs with good channel condition transmit at relatively low power level to reduce interference level. At the same time, MSs with good channel condition are received at relatively high power level to achieve high spectral efficiency.

VTC Fall, September 2006 MOTOROLA and the Stylized M Logo are registered in the US Patent & Trademark Office. All other product or service names are the property of their respective owners. © Motorola, Inc System Simulation (an example) 3 reference simulation cases 10 MHz system bandwidth 10 mobiles per sector with 8 maximum scheduled per 0.5ms sub-frame

VTC Fall, September 2006 MOTOROLA and the Stylized M Logo are registered in the US Patent & Trademark Office. All other product or service names are the property of their respective owners. © Motorola, Inc Comparison of PC Schemes Fractional power control compared with regular power control and full power transmission: Fractional power control provides the best tradeoff between the spectral efficiency and cell-edge performance. Case Sector Throughput (Kbps)5%-ile User Throughput (Kbps) Fractional PC Regular PC Full Power Fractional PC Regular PC Full Power

VTC Fall, September 2006 MOTOROLA and the Stylized M Logo are registered in the US Patent & Trademark Office. All other product or service names are the property of their respective owners. © Motorola, Inc Conclusions Fractional power control scheme can be applied for m UL interference coordination/control Inter-cell interference control through backhaul messaging 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

VTC Fall, September 2006 MOTOROLA and the Stylized M Logo are registered in the US Patent & Trademark Office. All other product or service names are the property of their respective owners. © Motorola, Inc Proposal to m SDD Include the following components in the SDD ToC Uplink interference coordination and control