Changes between Version 5 and Version 6 of 802.11/Benchmarks/IFS


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Timestamp:
Nov 25, 2013, 10:43:33 PM (9 years ago)
Author:
welsh
Comment:

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  • 802.11/Benchmarks/IFS

    v5 v6  
    2525== DCF Interframe Space (DIFS) and Slot ==
    2626
    27 Two other critical interframe spacings are the DCF Interframe Space (DIFS) and slot time. The DIFS corresponds to the minimum amount of time between busy medium event and the transmission of another frame (excluding the cases covered by SIFS). The slot time corresponds to the amount of time between two different contention window (CW) values. To test our implementation's understanding these intervals, we have reversed the flow of traffic relative to the SIFS test above. Here, the DUT generates a data frame and the WARP AP is responsive for sending an ACK for that packet. In the case that the DUT chooses a CW of zero, the observed gap in time where the medium is idle corresponds to a DIFS. By increasing persistence on the oscilloscope to view multiple transmissions, other intervals corresponding to nonzero CW values can be observed. Comparing the relative start times of these other transmissions allows us to measure the slot time.
     27Two other critical interframe spacings are the DCF Interframe Space (DIFS) and slot time. The DIFS corresponds to the minimum amount of time between busy medium event and the transmission of another frame (excluding the cases covered by SIFS). The slot time corresponds to the amount of time between two different contention window (CW) values. To test our implementation's understanding these intervals, we have reversed the flow of traffic relative to the SIFS test above. Here, the DUT generates a data frame and the WARP AP is responsible for sending an ACK for that packet. In the case that the DUT chooses a CW of zero, the observed gap in time where the medium is idle corresponds to a DIFS. By increasing persistence on the oscilloscope to view multiple transmissions, other intervals corresponding to nonzero CW values can be observed. Comparing the relative start times of these other transmissions allows us to measure the slot time.
    2828
    2929||  [[Image(wiki:802.11/files:difs_bench.png, width=600)]]  ||