1. IEEE 802.16m UL Interference Mitigation Document Number: IEEE C802.16m-08/625 Date Submitted: 2008-06-07 Source: Amitava Ghosh, Fan Wang, Bishwarup Mondal, Mark Cudak, Fred Vook, Shirish NagarajE-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) Base Contribution: IEEE C802.16m-08/625 Abstract: Proposal for 16m 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: and.http://standards.ieee.org/guides/bylaws/sect6-7.html#6http://standards.ieee.org/guides/opman/sect6.html#6.3 Further information is located at and.http://standards.ieee.org/board/pat/pat-material.htmlhttp://standards.ieee.org/board/pat

2. 2 UL Interference Coordination/Control  IoT control is critical for 802.16m  MS battery life  Cell edge coverage/performance  Inter-cell interference control using overload indicator  To tightly control IoT, neighbor APs need to share uplink performance metrics, e.g. High/unacceptable IoT Average IoT changes significantly over the whole band; Unsatisfactory uplink performance; Load change in the cell; The interval between updatings can be hundreds of milliseconds (slow)  Above metrics are sent through backhaul messaging  Scheduler at APs can utilize the uplink performance metrics from neighboring cells to perform UL scheduling and resource allocation Fractional power control (see contribution C802.16m-08/626) Alternatively, each MS can derive its own transmission power and MCS using DL/UL reciprocity and control message from BS

3. 3 Classification of ICIC Schemes  Static  Each cell is configured statically, e.g. a certain (1/3) part of the bandwidth are reserved for the transmissions of the cell-edge UEs  For uniformly distributed cells with evenly loaded traffic, static ICIC schemes can achieve the maximum gain of ICIC.  Dynamic or Semi-Static  Each cell decides a part of the bandwidth for the transmissions of the cell-edge UEs based on its traffic load, MSs’ distribution, information from its neighboring cells etc.  High Interference Indicator (HII) is sent to the neighboring cells HII is sent as a bitmap for each frequency band Handshake procedure is defined to make sure that the system converges to stable status with reasonable gain from ICIC.