1. doc.: IEEE 802.15-06/0076r0 Submission Jan 2006 Tom Siep, Cambridge Silicon Radio PlcSlide 1 Coexistence TAG Liaison Report Notice: This document has been prepared to assist IEEE 802.11. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) 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 802.11. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures, including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802.11 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at.http:// ieee802.org/guides/bylaws/sb-bylaws.pdfstuart.kerry@philips.compatcom@ieee.org Date: 2006-01-20 Authors:

2. doc.: IEEE 802.15-06/0076r0 Submission Jan 2006 Tom Siep, Cambridge Silicon Radio PlcSlide 2 Abstract 15 day letter ballot for PAR/5C 4a interaction Issue with 802.15.1 (Bluetooth) and 802.11

3. doc.: IEEE 802.15-06/0076r0 Submission Jan 2006 Tom Siep, Cambridge Silicon Radio PlcSlide 3 PAR Description This Recommended Practice describes methods for assessing coexistence of wireless networks. The document defines recommended coexistence metrics and methods of computing these coexistence metrics. The focus of the document is on IEEE 802 wireless networks, though the methods developed here may be applicable in other places. Industry continues to develop new standards and specifications for wireless networks which operate in frequency bands shared with other wireless networks. In IEEE 802 alone there are multiple working groups that develop standards that operate in frequency bands shared by other wireless networks. The working groups in 802 that develop such standards include: 802.11, 802.15, 802.16, and 802.22. The wireless networks to be considered in this project operate in a shared frequency band, however, that does not prevent the project from considering out-of-band interference. There is a need for recommended methods for evaluating how well these wireless networks coexist. The purpose of this project is to define recommended methods for objectively assessing the coexistence of these wireless networks.

4. doc.: IEEE 802.15-06/0076r0 Submission Jan 2006 Tom Siep, Cambridge Silicon Radio PlcSlide 4 Reason for the Proposed Project The IEEE 802 executive committee has adopted a rule that new wireless standards for unlicensed wireless networks must assess the coexistence of the proposed standard with existing standards. If industry develops standards for wireless networks operating in shared frequency bands without having recommended methods for assessing how well these wireless networks coexist, that will have a negative impact on the industry. One of the benefits of this document is to provide standardized means to predict how well wireless networks will coexist. The prediction of coexistence will guide the standards development engineers to develop improved wireless standards. The stakeholders include, but are not limited to, wireless standards development organizations, such as IEEE 802.

5. doc.: IEEE 802.15-06/0076r0 Submission Jan 2006 Tom Siep, Cambridge Silicon Radio PlcSlide 5 Interaction with 802.15.4a Good discussion See 15.4a report for details

6. doc.: IEEE 802.15-06/0076r0 Submission Jan 2006 Tom Siep, Cambridge Silicon Radio PlcSlide 6 Attributes of the Problem between Bluetooth / 802.11 802.11: –Needs a level of QoS to maintain a VoIP connection with an acceptable level of service –Uses a random, logarithmically increasing back-off in the presence of interference 802.15.1 –May use all of the 2.4 GHz band –Generally may not be aware of 802.11 –802.15.1 does not care, nor is effected by 802.11