May 2004 doc IEEE 802 11 04559 r

May 2004 doc. : IEEE 802. 11 -04/559 r 1 Measurement Duration in IEEE 802. 11 k Simon Black, Jon Edney Nokia simon. black@intalk 2 k. com, jon. edney@intalk 2 k. com Submission 1 Black/Edney, Nokia

May 2004 doc. : IEEE 802. 11 -04/559 r 1 Measurement Duration in D 0. 14 • Requested measurement duration specified in all measurement request types • Measurement duration reported in all measurement reports – Needed for autonomous measurements • Text in 11. 7. 4 specifies that a STA ‘may reject any measurement request element whose duration exceeds the maximum allowed off-serving channel time’ Submission 2 Black/Edney, Nokia

May 2004 doc. : IEEE 802. 11 -04/559 r 1 Comment #15 • What does ‘measurement duration’ in the measurement request mean? – No text specifying how a STA receiving a request interprets the requested duration – Can the measuring STA make a measurement shorter than that requested, or must it reject the request if it is unwilling to measure for the requested duration? – Does the measurement period have to be continuous? • Related comment – can a measurement in a periodic sequence be truncated? Submission 3 Black/Edney, Nokia

May 2004 doc. : IEEE 802. 11 -04/559 r 1 Measurement Duration may be Important • Requested duration may be important for some measurements – Obtaining acceptable averages, or sample sizes – Obtaining consistent measurements for comparison purposes – Passive mode beacon measurements • A measurement over a shorter period might be of little or no value to the requestor – May result in lots of rejected measurement requests Submission 4 Black/Edney, Nokia

May 2004 doc. : IEEE 802. 11 -04/559 r 1 Best effort measurements • For some measurements, the requestor may be prepared to accept a measurement taken over a shorter duration • A shorter measurement may be better than no measurement at all • Measurement duration is a ‘target value’ Submission 5 Black/Edney, Nokia

May 2004 doc. : IEEE 802. 11 -04/559 r 1 Proposal • The requesting STA is in a better position to set the requirements on measurement duration • On a per measurement basis, the requesting STA may require a specific duration, or may accept ‘best effort’ duration • Optimised use of measurement protocol Submission 6 Black/Edney, Nokia

May 2004 doc. : IEEE 802. 11 -04/559 r 1 Solution • Add a ‘duration mandatory’ bit to the measurement mode field – If set, the entire measurement should be performed, or the request rejected – If clear, the measuring STA may make a ‘best effort’ measurement Submission 7 Black/Edney, Nokia

May 2004 doc. : IEEE 802. 11 -04/559 r 1 Normative text proposal • See document 04/560 r 1 Submission 8 Black/Edney, Nokia

May 2004 doc. : IEEE 802. 11 -04/559 r 1 Motion To instruct the editor to apply the editing instructions in document 11 -04 -560 r 1 when preparing the next version of the IEEE 802. 11 k draft. Moved: Black Second: Y: Submission N: A: 9 Black/Edney, Nokia