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Understanding Measurement Duration in IEEE 802.11k

Learn about measurement duration in IEEE 802.11k, its importance in autonomous measurements, and how to interpret and optimize measurement periods.

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Understanding Measurement Duration in IEEE 802.11k

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  1. Measurement Duration in IEEE802.11k Simon Black, Jon Edney Nokia simon.black@intalk2k.com, jon.edney@intalk2k.com Black/Edney, Nokia

  2. Measurement Duration in D0.14 • 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’ Black/Edney, Nokia

  3. 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? Black/Edney, Nokia

  4. 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 Black/Edney, Nokia

  5. 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’ Black/Edney, Nokia

  6. 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 Black/Edney, Nokia

  7. 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, subject to a minimum duration specified in the measurement request • Measurement type contains two duration fields if the ‘duration mandatory’ bit is clear • Minimum duration field specifies a minimum acceptable duration if the target duration is not acceptable Black/Edney, Nokia

  8. Normative text proposal • See document 04/560 Black/Edney, Nokia

  9. Motion To instruct the editor to apply the editing instructions in document 11-04-560r0 when preparing the next version of the IEEE802.11k draft. Moved: Black Second: Y: N: A: Black/Edney, Nokia

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