1. Femto BS coexistence with WiFi-AP IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: [IEEE C802.16m-08/1309r1] Date Submitted: [2008-11-06] Source: Masato Okuda, Yanling Lu, Wei-Peng ChenVoice:+81-44-754-2811 FujitsuE-mail:okuda@jp.fujitsu.comokuda@jp.fujitsu.com * http://standards.ieee.org/faqs/affiliationFAQ.html Venue: IEEE 802.16m-08/040“Call for Contributions on Project 802.16m System Description Document (SDD)”, in response to the following topics: “TGm SDD: Femtocells”, MAC related ] Base Contribution: N/A Purpose: to be discussed and adopted by TGm 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: 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. Femto BS Coexistence with WiFi SRD specifies requirement for a femtocell BS (fBS) coexistence with WiFi or Bluetooth. –In 9.5, “The air interface shall support seamless coexistence of Femtocell BS’s with WiFi or Bluetooth systems.” Rev.2 solves co-location of 802.16 and WiFi/BT in a MS. However, a fBS may be co-located with WiFi-AP. Femto BS & WiFi AP DSL modem Internet WiMAX Operator Network WiFi terminal WiMAX MS

3. Coexistence in MS and fBS 802.16/Wi-Fi Coexistence in MS –Rev.2: MS can perform WiFi/BT communication during sleep window, while BS is always in operation mode to communicate with other MSs. 802.16/Wi-Fi Coexistence in fBS –Our Proposal: During the MS sleep window, fBS performs WiFi communication and neither fBS nor MS shall not send any 802.16 radio signal to prevent interference. –The same concept can be applied to idle mode operation. 802.16 frame BS 802.16 frame MS WiFi/Bluetooth Sleep Window WiFi/Bluetooth 802.16 frame BS 802.16 frame MS Sleep Window WiFi

4. fBS supporting Closed User Group When a fBS is configured for supporting only Closed User Group, the fBS does not need to send any radio signal, while all member MSs of the CUG are away from the fBS. As a result of stopping radiation of 16m signal, WiFi-AP can make full use of time duration. –Location of MSs are managed by ASN-GW or other network entity. fBS & WiFi AP WiFi terminal CUG MS When CUG MS is away from femtocell, fBS stops radiating 16m signal.

5. Proposed Text [Insert the following new subclause to the section 17 (Support for Femtocell)] 17.XCoexistence with other RATs When a femtocell BS is co-located with other RATs, it shall provide silent duration of 802.16 air interface which can be used by the other RATs. During the silent duration, the femtocell BS and its subordinate MS shall not send any radio signal. 17.X.1 Sleep mode for co-located Femtocell BS When all MSs under a co-located Femtocell BS are in sleep, the co-located Femtocell BS and all the MSs attached shall not send any radio signal during sleep window. 17.X.2 Idle mode for co-located Femtocell BS When all MS under a co-located Femtocell BS are in idle mode, the co-located Femtocell BS and all the MSs attached shall not send any radio signal during paging unavailable interval. 17.X.3 CUG MS absence in vicinity of co-located Femtocell BS While all MSs of a closed user group served by Femtocell BS are not in vicinity of the co- located femtocell, the co-located Femtocell BS shall not send any radio signal.