1. doc.: IEEE 802.22-06/0156r0 Submission August 2006 Carlos Cordeiro, PhilipsSlide 1 Superframe Structure IEEE P802.22 Wireless RANs Date: 2006-08-15 Authors: Notice: This document has been prepared to assist IEEE 802.22. 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 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 802.22. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures http://standards.ieee.org/guides/bylaws/sb-bylaws.pdf 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 Chairhttp://standards.ieee.org/guides/bylaws/sb-bylaws.pdf Carl R. StevensonCarl R. Stevenson 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 802.22 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at patcom@iee.org.patcom@iee.org >

2. doc.: IEEE 802.22-06/0156r0 Submission August 2006 Carlos Cordeiro, PhilipsSlide 2 Introduction The purpose of this presentation is to provide further clarification on the superframe structure adopted in the current Draft 0.1 spec In this presentation we show that: –Superframe allows the support of a number of advanced features, NOT ONLY channel bonding –Superframe allows the standard to be future proof –Superframe can also be used for SINGLE CHANNEL only case –Superframe overhead is negligible

3. doc.: IEEE 802.22-06/0156r0 Submission August 2006 Carlos Cordeiro, PhilipsSlide 3 Superframe Structure Superframes allow a number of advanced features to be implemented –For incumbent protection, so that quiet periods of overlapping networks can be synchronized –The self-coexistence mechanisms available in the current draft depend on it –The synchronization of overlapping 802.22 networks depend on it So, it is NOT all about channel bonding –A great deal of the current draft 0.1 spec relies on the superframe structure for a number of different things (please refer to the spec for more info)

4. doc.: IEEE 802.22-06/0156r0 Submission August 2006 Carlos Cordeiro, PhilipsSlide 4 Superframe Structure: the General Case The MAC can simultaneously support single channel and multi-channel CPEs –Capacity as needed (up to subscriber) –Product differentiation –Controllable by BS, etc.

5. doc.: IEEE 802.22-06/0156r0 Submission August 2006 Carlos Cordeiro, PhilipsSlide 5 Superframe Structure: the Single Channel case If only a single channel is used, the superframe is transmitted on that channel only –No added complexity Plus, this allows for future extensions

6. doc.: IEEE 802.22-06/0156r0 Submission August 2006 Carlos Cordeiro, PhilipsSlide 6 Superframe Structure in Numbers Superframe size is fixed at 160ms –That is, a total of sixteen 10ms frames per superframe Superframe structure consumes only 3 OFDM symbols for an entire superframe duration –Short preamble + long preamble + superframe header If we consider the size of an OFDM symbol of about 373µs, this results in a negligible overhead of approximately 0.70%!!!!

7. doc.: IEEE 802.22-06/0156r0 Submission August 2006 Carlos Cordeiro, PhilipsSlide 7 Conclusions The superframe structure allows for a number of advanced features to be implemented –A number of mandatory schemes in draft 0.1 depend on it We have shown that the superframe structure: –Allows the support of a number of advanced features, NOT ONLY channel bonding –Allows the standard to be future proof –Incurs negligible overhead of only 0.70% –Can also be used for the SINGLE CHANNEL only case The superframe structure is currently mandatory –This way, the standard is made future proof and compatible with future amendments/enhancements