1. doc.: IEEE 802.11-05/0340r0 Submission April 2005 Marianna Goldhammer, AlvarionSlide 1 CBP-SG Contention Based Protocol and 802.16 QoS 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: 2005-04-20 Authors:

2. doc.: IEEE 802.11-05/0340r0 Submission April 2005 Marianna Goldhammer, AlvarionSlide 2 Abstract Discussion of terms QoS Clear Channel Assessment 802.16 MAC and CCA Conclusion FCC R&O FCC Feedback

3. doc.: IEEE 802.11-05/0340r0 Submission April 2005 Marianna Goldhammer, AlvarionSlide 3 Title: Contention Based Protocol and 802.16 QoS Document Number: Date Submitted: April 20, 2005 Source: Marianna GoldhammerVoice:+972 3 645 6241 marianna.goldhammer@alvarion.commarianna.goldhammer@alvarion.com ALVARION 21a HaBarzel Street, Tel Aviv, Israel Venue: Meeting : 802.11 SG on 3.65GHz Base Document: Purpose: Notice: This document has been prepared to assist IEEE 802.16. 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,b 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. IEEE 802.16 Patent Policy: The contributor is familiar with the IEEE 802.16 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 802.16 Working Group. The Chair will disclose this notification via the IEEE 802.16 web site.

4. doc.: IEEE 802.11-05/0340r0 Submission April 2005 Marianna Goldhammer, AlvarionSlide 4 QoS –802.16: scheduled transmission, guarantees QoS –CBP: contention-based protocol, no QoS guarantee –QoS means for a Service Provider Some minimum data rate Some max. delay

5. doc.: IEEE 802.11-05/0340r0 Submission April 2005 Marianna Goldhammer, AlvarionSlide 5 Clear Channel Assessment before transmissions Incompatible with the scheduled transmissions concept  NOT providing QoS Destroying the high-spectral efficiency concept –A scheduled interval for transmission shall include time for other transmissions, even if they do not take place Incompatible with directional antennas –Antenna isolation may cause CPE to be hidden from each other Creating interference to neighbor CPE –A CPE may not “see” a foreign Base Station transmission to a neighboring CPE belonging to that network and thus may transmit at times when the neighbor CPE is in Receive state Does not prevents the interference at RECEIVER location

6. doc.: IEEE 802.11-05/0340r0 Submission April 2005 Marianna Goldhammer, AlvarionSlide 6 More on CCA 802.11: Clear Channel Assessment is done at transmitter location and the interference is experienced at RECEIVER location –500m distance may introduce between them >100dB isolation 802.11a –Detects 802.16 at –62dBm! 802.11g –Does not specify a level for detecting non-802.11 systems

7. doc.: IEEE 802.11-05/0340r0 Submission April 2005 Marianna Goldhammer, AlvarionSlide 7 802.16 MAC and CCA CPE location: neighbor 802.11 device START: 802.16 CPE transmits Var. 1: CCA works and 802.11 device is not transmitting Var. 2: 802.11 was active and its reception may be interfered –Next: 802.16 CPE enters receive state 802.11 device starts to transmit –Next: 802.16 BS transmits CPE receive at –90dbm CCA does not work CPE lose the MAP and the scheduling info –802.16 lose the transmit opportunity –Next: 802.16 CPE transmits to request BW (go to START)

8. doc.: IEEE 802.11-05/0340r0 Submission April 2005 Marianna Goldhammer, AlvarionSlide 8 Conclusion A Contention-Based Protocol prevents 802.16 to work!

9. doc.: IEEE 802.11-05/0340r0 Submission April 2005 Marianna Goldhammer, AlvarionSlide 9 FCC R&O Requirement for a Coexistence protocol –802.16h fits the definition A protocol that allows multiple users to share the same spectrum by defining the events that must occur when two or more transmitters attempt to simultaneously access the same channel and establishing rules by which a transmitter provides reasonable opportunities for other transmitters to operate –The term “contention-based” protocol is too suggestive of a particular solution and is NOT technology neutral: FCC should change the name to “coexistence protocol”

10. doc.: IEEE 802.11-05/0340r0 Submission April 2005 Marianna Goldhammer, AlvarionSlide 10 FCC feedback On a proposed coexistence protocol based on scheduling –It is in line with FCC definition, even if is NOT based on contentions