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Clarifications on Measurement Duration Fields

This paper explores IEEE 802.11h draft D1.0 Measurement Request structure, proposing text to clarify field definitions for Measurement Duration and Report Time Limit.

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Clarifications on Measurement Duration Fields

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  1. Clarifications on Measurement Duration and Report Time Limit Fields A. Soomro and S. Choi PHILIPS Research USA A. Soomro and S. Choi, PHILIPS Research, USA

  2. Introduction • Review of IEEE 802.11h draft D1.0 Measurement Request structure • Proposed text to clarify field definitions • Conclusions A. Soomro and S. Choi, PHILIPS Research, USA

  3. Measurement Request Frames • Channel Measurement Request Frame • Basic Channel Measurement Method Element 2 A. Soomro and S. Choi, PHILIPS Research, USA

  4. Measurement Duration (CP) • Measurement Duration (>0) indicates the total time duration, in number of TUs, excluding channel switch time (aChannelSwitchTime), which the requested STA spends for the measurement of each channel. • Up to 2^16 TUs ~ approximately 65536 (msec) • aChannelSwitchTime: Maximum time to change to a new channel and “park” in RX or TX mode which is <= 1 msec per 9.13.4 in 802.11h/D1.0 A. Soomro and S. Choi, PHILIPS Research, USA

  5. Measurement Duration (CFP) • A CF channel measurement: No measurements at specified times. • The individual time intervals which make up Measurement Duration may be non-contiguous. • Allows spreading measurement of a single channel over several beacon intervals without hurting: • Reception of multicast traffic • Reception of time sensitive (QoS) traffic A. Soomro and S. Choi, PHILIPS Research, USA

  6. Report Time Limit • Report Time Limit (>0) indicates the time duration, in the number of TUs TBTTs, in which the requested STA should report the measurement results back to the AP. after the frequency channel measurement. The specified duration commences from the end of the corresponding Activation Delay. The STA may discard the measurement results if it is unable to transmit before the duration ends. • Up to 2^16 TUs ~ approximately 65536 (msec) A. Soomro and S. Choi, PHILIPS Research, USA

  7. Measurement Duration and LimitExample Measurement Request by AP Measurement Report by the STA Report Time Limit = 5 Time Beacon Activation Delay = 4 The Measurement A. Soomro and S. Choi, PHILIPS Research, USA

  8. Conclusions • Measurement Duration field definition • Report Time Limit field definition • Draft text modification submitted A. Soomro and S. Choi, PHILIPS Research, USA

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