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The use of 802.11 Timing Measurement with P802.1ASbt in the context of P802.11ak

The use of 802.11 Timing Measurement with P802.1ASbt in the context of P802.11ak. Authors:. Date: 2013-11-14. Abstract. This is the 802.11 upload of the 802.1 document Asbt-kbstanton-TimingMeasurements-status-1113-v02.pptx.

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The use of 802.11 Timing Measurement with P802.1ASbt in the context of P802.11ak

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  1. The use of 802.11 Timing Measurementwith P802.1ASbt in the context of P802.11ak Authors: • Date:2013-11-14 Kevin B. Stanton, Intel

  2. Abstract • This is the 802.11 upload of the 802.1 document • Asbt-kbstanton-TimingMeasurements-status-1113-v02.pptx. Kevin B. Stanton, Intel

  3. Kevin B. Stanton, Intel The use of 802.11 Timing Measurementwith P802.1ASbtin the context of P802.11ak Kevin B. Stanton Intel Corporation November 2013

  4. Questions • What about the new dot11 Timing Measurement? • How does P802.11ak affect gPTP? Kevin B. Stanton, Intel

  5. The new dot11 Timing Measurement • IEEE Std. 802.1AS™-2011 specifies the use of Timing Measurement • Which is published in IEEE Std. 802.11™-2012 “ ” • P802.11mc is adding Fine Timing Measurement • It’s nearly the same as Timing Measurement • Increased timestamp resolution (10ns100ps) • Public Action Frame  Private Action Frame • Other changes expected • Expected to be published in 2015 • A change to P802.1ASbt is not recommended at this time Kevin B. Stanton, Intel

  6. Residence Time of a Station-Bridge • P802.11ak introduces WLAN Stations that Bridge • Residence Time of a WLAN Station-Bridge is large • FOLLOWUP information for message n sent in message n+1 • With fixed Sync Interval, Residence Time ≥ sync interval • Implications to P802.1ASbt, if we do nothing: • Introduces small lag in time propagation through Station Bridge • And this grows linearly with # of Station-Bridge += Sync Interval * # of Station-Bridges • Approaches • Bi-modal sync interval (“burst-of-two”) • Increased sync rate • Live with the lag • Probably fine for Stations, less fine for long chains of Station-Bridges Kevin B. Stanton, Intel

  7. IEEE Std. 802.11™-2012 Timing Measurement Kevin B. Stanton, Intel

  8. BACKUP Kevin B. Stanton, Intel

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