May 2006 doc IEEE 802 11 060644 r

May 2006 doc. : IEEE 802. 11 -06/0644 r 0 Measurement Pilot Transmission Information as optional information in Probe Response and Neighbor Report Authors: Date: 2006 -05 -12 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 <http: // ieee 802. 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 Chair <stuart. kerry@philips. 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 <patcom@ieee. org>. Submission 1 Päivi Ruuska, Nokia

May 2006 doc. : IEEE 802. 11 -06/0644 r 0 Abstract This submission introduces: • a Measurement Pilot Information to be added as optional element in the Probe Response • A Measurement Pilot Information to be added as optional sub-element in the Neighbor Report • Normative text is given in 06/0643 r 0. Submission 2 Päivi Ruuska, Nokia

May 2006 doc. : IEEE 802. 11 -06/0644 r 0 Introduction • Active Scan is used to detect APs. – STA uses the information in the Probe Response to select AP to associate or reassosiate to. – If the STA detects multiple APs, it may want to measure some of the APs by receiving more frames from them. • Neighbor Report is used to speed up the STA’s handoff from one BSS to another. – STA uses the information included in the Neighbor Report to select the APs to which it may roam to. – Before performing handoff to a new AP, the STA may want to measure some of the reported APs by receiving more packets from them. • Information about AP’s Measurement Pilot Transmissions would help STA to decide how to measure the AP efficiently and to align the measurement better with the user traffic. Submission 3 Päivi Ruuska, Nokia

May 2006 doc. : IEEE 802. 11 -06/0644 r 0 Fast and efficient scanning • • • From Neighbor Report or Probe Response the STA does not currently know whether the AP is transmitting Measurement Pilot Frames. STA may have Vo. IP link while it has to detect and scan new APs to roam to. STA may schedule the AP scannings better if knows whether the AP is transmitting Measurement Pilots frames. – APs not transmitting the Measurement Pilot frames shall be scanned by active scan or passive scan. – APs transmitting the Measurement Pilot frames with small Measurement Pilot Interval may be scanned any time e. g. between Vo. IP transmissions. • If the STA estimates the TBTT of the AP from the Probe Response or Neighbor Report information, it may scan AP passively at TBTTs. However, if the AP is transmitting Measurement Pilot frames, the STA would be able to receive “passively” the same amount of scan data much faster and it does have to schedule the transmission at TBTTs only. Submission 4 Päivi Ruuska, Nokia

May 2006 doc. : IEEE 802. 11 -06/0644 r 0 Overview of the normative text changes to include Measurement Pilot Transmission Information in Probe Response • New Measurement Pilot Transmission Information element is introduced. • The element may be included in the Probe Response. Element ID Octets: 1 Length Measurement Pilot Transmission 2 1 • Measurement Pilot Transmission field is Measurement Pilot Interval as specified in 7. 3. 1. 19, if the AP is transmitting Measurement Pilots. If the AP is not transmitting the Measurement Pilots, the Measurement Pilot Transmission field is set to zeroes. Submission 5 Päivi Ruuska, Nokia

May 2006 doc. : IEEE 802. 11 -06/0644 r 0 Overview of the normative text changes to include Measurement Pilot Transmission Information in Neighbor Report • • • Optional sub-elements may be added in Neighbor Report element. TSF information is currently such an optional sub-element. New Measurement Pilot Transmission Information sub-element is introduced. The element may be included in the Neighbor Report if the serving AP knows that the reported AP is not transmitting Measurement Pilot frames or that it is transmitting Measurement Pilot frames with the interval known by the serving AP. Sub-element ID Octets: • 1 Length Measurement Pilot Transmission 2 1 Measurement Pilot Transmission field is Measurement Pilot Interval as specified in 7. 3. 1. 19, if the AP is transmitting Measurement Pilots. If the AP is not transmitting the Measurement Pilots, the Measurement Pilot Transmission field is set to zeroes. Submission 6 Päivi Ruuska, Nokia