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Joe Kwak InterDigital Communications Corporation

September 2003. doc: IEEE 802.11-03/732r0. Periodic Measurements Beacon Request extensions to support roaming and dynamic data rate selection and other applications. Joe Kwak InterDigital Communications Corporation. Outline. Extensions for Periodic Measurements

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Joe Kwak InterDigital Communications Corporation

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  1. September 2003 doc: IEEE 802.11-03/732r0 Periodic MeasurementsBeacon Request extensions to support roaming and dynamic data rate selection and other applications Joe Kwak InterDigital Communications Corporation Joe Kwak, InterDigital

  2. Outline • Extensions for Periodic Measurements • Various Types of Measurement/Reporting • ACKs for Multicast/Broadcast Requests • Potential Uses • Example Reporting Conditions • Motion to incorporate Periodic Extensions for Beacon Request • Motion to incorporate Periodic Extensions for Other Measurements Joe Kwak, InterDigital

  3. Beacon Request Extensions for Periodic Measurments Current Beacon Req: Periodic Extensions: BSSID specifies which AP to measure when several APs may be detectable on a given channel. Broadcast BSSID is used when AP BSSID is unknown. Joe Kwak, InterDigital

  4. PSNI PSNI PSNI PSNI PSNI RCPI RCPI RCPI RCPI RCPI Types of Measurements/Reports Measurement Periodic Measurement Type Single Report Type Single Report Conditional Report Periodic Report Absolute Thresh Serving AP Thresh Serving AP Periodic Range Trigger Events Measurand Event detection triggers a report or triggers periodic reporting. Joe Kwak, InterDigital

  5. ACKs for Multicast/Broadcast Requests • Measurement Requests are Management Action Frames which require the STA to take the specified action. Therefore, the protocol needs to insure that the Measurement Request frames are correctly received at the intended destination STAs. • When Measurement Requests are unicast, receipt of Measurement Request is automatically acknowledge at Link level. • When measurement requests are multicast or broadcast: • In the case of a single, immediate Measurement Request, the request is acknowledged by the Measurement Report containing the measurement result. • In the case of a single, non-immediate Measurement Request (i.e. future start time), the request is acknowledged by sending a null Measurement Report. • When the requested measurement is periodic, the request is acknowledged by sending a null Measurement Report. • Using null Measurement Reports to acknowledge Measurement Request under these conditions is proposed in draft specification text for Periodic Beacon Requests. Joe Kwak, InterDigital

  6. Potential Uses for Periodic Beacon Measurements • Periodic measurements reduce management traffic: single measurement request produces multiple reports but only when relevant. • Absolute Threshold crossings on PSNI measures are ideal to trigger data rate changes. • Absolute Threshold crossings on RCPI are ideal for proximity detectors for location. • Relative Threshold wrt serving AP detects conditions for handoff. • Many other potential uses. Joe Kwak, InterDigital

  7. Absolute Threshold for Data Rate Selection 5.5 Mbps rate PSNI levels for serving AP as measured at STAs STA 2 STA 3 2 Mbps rate Absolute threshold 1 Mbps rate STA 1 Trigger to Change Rate Time Joe Kwak, InterDigital

  8. Relative Threshold using Serving AP for Handoff PSNI QOS measurement AP 2 offset Serving AP Trigger with offset H/O prep Time Trigger w/o offset for H/O Joe Kwak, InterDigital

  9. Relative Threshold Triggers Periodic Report for Handoff Joe Kwak, InterDigital

  10. RCPI Level Absolute Threshold Triggered Report Serving AP Time Absolute Threshold for Location AP detection area AP STA Joe Kwak, InterDigital

  11. Motion for Periodic Beacon Measurement • Move to instruct the editor to incorporate text from document 11-03-0733-00-000k-Beacon_Periodic_NormText.doc into TGk draft 0.6 specification document. • Moved by Joe Kwak • Seconded by: _______________ • Vote YEA _______ • Vote NEA _______ • ABSTAIN _______ • Motion Passes/Fails at ___% Joe Kwak, InterDigital

  12. Motion for Other Periodic Measurements • Move to instruct the editor to incorporate text from document 11-03-0734-00-000k-Other_Periodic_NormText.doc into TGk draft 0.6 specification document. • Moved by Joe Kwak • Seconded by: _______________ • Vote YEA _______ • Vote NEA _______ • ABSTAIN _______ • Motion Passes/Fails at ___% Joe Kwak, InterDigital

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