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Measurement Start Time

This proposal suggests removing the specific start time requirement for measurements in TGk, as it is not practical and of little use. Two options are given: eliminate the start time altogether or update the language to make the start time a recommendation. The motion is to incorporate these changes into the TGk draft document.

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Measurement Start Time

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  1. Measurement Start Time Tim Olson, David Skellern Cisco Systems Inc tolson@cisco.com, skellern@cisco.com Olson & Skellern, Cisco Systems

  2. Start Time change proposed by 03/372 • Attempt to be compatible with TGh • Addition of an absolute start time to each measurement request specified as a TSF • Removal of “parallel” measurement mode bit Olson & Skellern, Cisco Systems

  3. Issues with 03/372 related to TGh • Start time changes don’t match latest TGh draft D3.11 – TGh allows +/- 32usecs • TGh has a very specific scope of detecting radars • Measurement definitions and timing are tailored for that purpose • Absolute start times allow synchronization of measurement start times within the Quiet Periods specified by TGh • TGk should remain compatible with TGh when it makes sense to do so • TGk Requirements do not call for absolute time Olson & Skellern, Cisco Systems

  4. Issues with 03/372 related absolute start time complexity • Demanding an absolute measurement start time requires either • that measurements have priority over data (note an 11k requirement), or • that the AP predict in the future when a measurement may be made; it is a very non-trivial problem (and probably impractical) when measurements may be made • Cisco and several of its partners investigated the implementation of specific measurement start times and found it was not practical • Start times can be unpredictable by as much as 100’s of ms Olson & Skellern, Cisco Systems

  5. Start Time Complexities • Predicting future channel availability • Calculating delays due to other traffic • Factoring in a client in power save for unicast measurement requests • If a client is in power save the broadcast measurement request start times would have to account for DTIM interval and the current amount of other broadcast and multicast traffic. • Factoring in channel switch times (which vary by manufacturer) for non-serving channel measurements Olson & Skellern, Cisco Systems

  6. Why have a specific start time? • Currently in the TGk Issues and Requirements document there is no need for absolute start times • Are best effort measurements sufficient? • What radio measurement features cannot be satisfied with best effort measurements? • The entity best suited for determining when to take a measurement is the STA that received the measurement request Olson & Skellern, Cisco Systems

  7. Proposal • Update the current draft to eliminate the requirement of a specific start time • Two options for doing this…. • Eliminate start time from the draft • Update language to make the current start time merely a recommendation • This proposal recommends removing the start time altogether • Leaving in a start time that does not need to be adhered to seems to be extraneous and of little use • Measurement start times may be delayed if required by sending out the measurement request when needed Olson & Skellern, Cisco Systems

  8. Draft Updates Proposed • Remove Measurement Start Time field from each measurement request messages (sections 7.3.2.19.1, 7.3.2.19.2, 7.3.2.19.3, 7.3.2.19.4, 7.3.2.19.5, 7.3.2.19.6) • Add parallel mode bit back into the Measurement Mode field (section 7.3.2.19) Olson & Skellern, Cisco Systems

  9. Motion • Move to instruct the editor to incorporate the changes to the text described in 03/762r0 into the TGk 0.6 draft document Moved David Skellern_______ Second ___________________ Yes _______ No _______ Abstain _______ Olson & Skellern, Cisco Systems

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