1. doc.: IEEE 802.11-07/0039r1 Submission January 2007 Larry Green, Ixia Slide 1 TCP Parameters and Settings 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 stuart@ok-brit.com 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.pdf stuart@ok-brit.compatcom@ieee.org Date: 2007-01-17 Authors:

2. doc.: IEEE 802.11-07/0039r1 Submission January 2007 Larry Green, Ixia Slide 2 Abstract TCP parameters and settings are provided as a baseline for consistent testing of 802.11 devices over TCP/IP networks. Comment ID 286 calls for this detail.

3. doc.: IEEE 802.11-07/0039r1 Submission January 2007 Larry Green, Ixia Slide 3 TCP Parameters and Settings The maximum TCP window size shall be at least as large as the bandwidth-delay product of the wireless link. –Increase the receiver buffer size if necessary. –Turn on the window scaling mechanism if necessary. The delayed ACK mechanism shall be enabled. –The baseline delayed ACK setting shall be one TCP ACK sent for every 2 data segments to which delayed ACK applies. –If the protocol stack permits this setting to be adjusted, an additional test trial shall be performed with an increased number of data segments per returned TCP ACK, up to a maximum of 4 segments. The MTU (Maximum Transmission Unit) size shall be set to 1500 bytes.

4. doc.: IEEE 802.11-07/0039r1 Submission January 2007 Larry Green, Ixia Slide 4 TCP Parameters and Settings For DUTs with an Operating System that does not allow setting the TCP or protocol parameters in line with the TGT TCP/IP settings, all deviations from the settings will be noted in the reported results. For DUTs with an Operating System that allows tuning of TCP or other protocol parameters in addition to the ones listed above, the Operating System default parameters shall be used for all baseline tests. If the Operating System default parameters are changed for certain test modifiers, all the changes will be detailed in the reported results

5. doc.: IEEE 802.11-07/0039r1 Submission January 2007 Larry Green, Ixia Slide 5 MAC Settings The same 802.11 MAC aggregation scheme, if any, shall be applied to both directions of the wireless link.

6. doc.: IEEE 802.11-07/0039r1 Submission January 2007 Larry Green, Ixia Slide 6 Position of new text in the draft The text in slides 3,4,5 clearly applies to multiple metrics in Clause 6. Further, it is specifying something that is not a metric or an environment. Thus the logical place for this is a normative Annex that is then referenced by Clause 6. As normative Annexes must precede informative Annexes with the exception of the Bibliography, the current Annex C moves to Annex D The text in slides 3,4,5 forms new Annex C.

7. doc.: IEEE 802.11-07/0039r1 Submission January 2007 Larry Green, Ixia Slide 7 References to new Annex C Finally, in the four locations in the draft that specify TCP traffic (subclauses 6.3, 6.4, 6.5 and 6.20), a statement will be added as follows: “If the TCP traffic type is used, the TCP protocol stack and/or operating system should be configured according to Annex C”