Dynamic Interference Mitigation for Femtocell Access Points in IEEE802 Dynamic Interference Mitigation for Femtocell Access Points in IEEE802.16m Network IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE C802.16m-08/607 Date Submitted: 2008-07-07 Source: Yuefeng Zhou, Karthik Sundaresan Honghai Zhang, Nader Zein, Sampath Rangarajan Voice: +44-20-87523460 NEC E-mail: yuefeng.zhou@eu.nec.com *<http://standards.ieee.org/faqs/affiliationFAQ.html> Venue: IEEE 802.16 Session #56, Denver, CO, USA Base Contribution: Purpose: To discuss and adopt the proposed Interference mitigation scheme for Femtocell herein for the 802.16m SDD 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 >.

Dynamic Interference Mitigation for Femtocell Access Points in IEEE802 Dynamic Interference Mitigation for Femtocell Access Points in IEEE802.16m Network Authors: Yuefeng Zhou, Nader Zein NEC Europe Karthik Sundaresan Honghai Zhang, Sampath Rangarajan NEC US Labs

Dynamic Interference Mitigation for Femtocell Access Points in IEEE802 Dynamic Interference Mitigation for Femtocell Access Points in IEEE802.16m Network Femtocell has gained tremendous momentum in the industries. It has been regarded not only a new technology to provide reliable indoor coverage, but also a new business model for higher quality and cheaper integrated services. 3G Femtocell has been deployed in Europe LTE ( LTE-A) and WiMAX Forum are making efforts on Femtocell standardization IEEE802.16m has to consider supporting Femtocell Access with spectrum efficiency

Dynamic Interference Mitigation Femtocell Access Points in IEEE802 Dynamic Interference Mitigation Femtocell Access Points in IEEE802.16m Network Interference Mitigation is an important aspect for Femtocell access Macro cell base station has high transmission power and will interfere the Femtocell, which is under the coverage of the Macro cell; Also, Closer femtocells will interfere each other as well. Radio environment is dynamically changing New femtocell being switched on; Relay stations might have mobility; Traffic load within a Femtocell might be changing No need to fix the number of subchannels to a femtocell, less number of subchannels allocated to a femtocell, less probability to cause interference to neighbor cells.

Dynamic Interference mitigation Dynamic Interference Mitigation for Femtocell Access Points in IEEE802.16m Network Dynamic Interference mitigation Femtocell access point should support periodically scaning the radio environment, and detect the interference situation surrounding itself. Femtocell access point should then peridically report following information to high layer network controller, such as ASN-GW; List of the index of the detected preambles; List of the signal strength of the detected preambles; Required traffic load ( or number of MS, which currently connecting to the femtocell ); The index of the preamble with the least received signal strength; The high layer network controller, such as ASN-GW, will dynamically assign preamble, certain number of subchannels for the femtocell access point to mitigate the interference and allow appropriate traffic load within the femtocell.

Proposed Text -- IEEE802.16m-based Femtocell access point shall support peridical neighbor station measurement. The measurement should include the signal strength and preamble index of neighbor stations/access points with unique IDs, and the index of the preamble with the least received signal strength. The femtocell access point should peridically report these measurements to ASN-GW to facilitate the scheduling algorithm in ASN-GW to allocate preamble and subchannels to the femtocell access point. The femtocell access point may report the number of MS currently connecting to itself to ASN-GW.