1. doc.: IEEE 802.11-05/0534r0 Submission May 2005 Steve Shellhammer, Intel CorporationSlide 1 Thoughts on Modifications of the TGn Functional Requirements for Low Cost – Low Power Devices 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: 2005-05-31 Authors:

2. doc.: IEEE 802.11-05/0534r0 Submission May 2005 Steve Shellhammer, Intel CorporationSlide 2 Motivation The motivation for changing the TGn Functional Requirements is to allow for a class of lower cost, lower power devices (e.g. handhelds and printers)

3. doc.: IEEE 802.11-05/0534r0 Submission May 2005 Steve Shellhammer, Intel CorporationSlide 3 Goal The Ad-Hoc committee is to develop recommended modifications to the TGn Functional Requirements which would enable such lower cost, lower power TGn devices The task group would vote to approve those changes

4. doc.: IEEE 802.11-05/0534r0 Submission May 2005 Steve Shellhammer, Intel CorporationSlide 4 Suggested Process 1.Identify what class of TGn implementations are currently prevented by the Functional Requirements 2.Develop changes to the Functional Requirements to allow for these classes of implementations, while not accidentally enabling unintended consequences

5. doc.: IEEE 802.11-05/0534r0 Submission May 2005 Steve Shellhammer, Intel CorporationSlide 5 Classes of Low Cost – Low Power Implementations Class 1 –Single TX RF chain and single TX antenna –Single RX RF chain and single RX antenna Class 2 –Single TX RF chain and dual (or more) TX antenna (TX antenna selection) –Single RX RF chain and dual RX antenna device (RX antenna selection) Class 3 –Single TX RF chain and single TX antenna –Dual (or more) RX RF chain and dual (or more) RX antenna (MRC)

6. doc.: IEEE 802.11-05/0534r0 Submission May 2005 Steve Shellhammer, Intel CorporationSlide 6 Summary of characteristics of these classes of low cost – low power devices The identifying characteristic of these classes of devices is: –Single TX RF chain Why not use the term “Single Stream Device?” –Because single stream is not only for single TX antenna devices. So the term is too general. It could give a special exception to devices with 2 TX chains. Any decide with 2 TX chains should be able to meet the standard requirements.

7. doc.: IEEE 802.11-05/0534r0 Submission May 2005 Steve Shellhammer, Intel CorporationSlide 7 Recommendation Summary Change FR1 and FR2 to allow an exception for “Single TX RF chain devices” For those class of devices change the throughput requirement from 100 Mb/s to 50 Mb/s

8. doc.: IEEE 802.11-05/0534r0 Submission May 2005 Steve Shellhammer, Intel CorporationSlide 8 Recommended Change #1 Change FR1 from –“Demonstrate at least one set of conditions under which 100 Mbps at the top of the MAC SAP can be achieved. Provide all relevant information to document this” To –“Demonstrate at least one set of conditions under which 100 Mbps at the top of the MAC SAP can be achieved. Provide all relevant information to document this, with an exception for devices with only a single TX RF chain”

9. doc.: IEEE 802.11-05/0534r0 Submission May 2005 Steve Shellhammer, Intel CorporationSlide 9 Recommended Change #2 Add FR1a –“For devices with only a single TX RF chain demonstrate at least one set of conditions under which 50 Mbps at the top of the MAC SAP can be achieved. Provide all relevant information to document this”

10. doc.: IEEE 802.11-05/0534r0 Submission May 2005 Steve Shellhammer, Intel CorporationSlide 10 Recommended Change #3 Change FR2 from –“Proposal supports at least one mode of operation that supports 100Mbps throughput at the top of the MAC SAP in a 20MHz channel. Provide all relevant information to document this.” To –“Proposal supports at least one mode of operation that supports 100Mbps throughput at the top of the MAC SAP in a 20MHz channel. Provide all relevant information to document this, with an exception for devices with only a single TX RF chain.”

11. doc.: IEEE 802.11-05/0534r0 Submission May 2005 Steve Shellhammer, Intel CorporationSlide 11 Recommended Change #4 Add FR2a –“For devices with only a single TX RF chain the proposal supports at least one mode of operation that supports 50 Mbps throughput at the top of the MAC SAP in a 20MHz channel. Provide all relevant information to document this.”

12. doc.: IEEE 802.11-05/0534r0 Submission May 2005 Steve Shellhammer, Intel CorporationSlide 12 References 1.Adrian Stephens, IEEE 802.11-03/813r12, 802.11 TGn Functional Requirements, March 17, 2004.