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OBSS Preamble Detection

This study compares the probability of preamble detection in scenario 1 (with 3 channels) and scenario 2 (Qualcomm, 4 channels) and its impact on throughput. Results indicate a low success rate of decoding OBSS preambles in both scenarios, which may affect protocols relying on preamble detection.

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OBSS Preamble Detection

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  1. OBSS Preamble Detection Date: 2015-02-26 Authors:

  2. In 11-14-1420-01 it was shown that errors on OBSS preambles were very high • Scenario 1 with 3 channels • Errors around 80-90% • In this presentation we check the probability of preamble detection in both scneario 1 and scenario 2 Context Qualcomm

  3. 3 channels • Chosen to maximize distance between two apartments one 1 channel. • 5 STAs per AP • 1 antenna per AP & STA Simulation Setup: Scneario 1 Qualcomm

  4. Simulation Parameters Qualcomm

  5. Shape of curves remains the same regardless of whether Preamble Detection is ON or OFF for OBSS packets • Note:having premable detection “OFF” for OBSS packets is like “OBSS color scheme” Throughput results Preamble Detection ON for all packets Premable Detection ON only for in-BSS packets Qualcomm

  6. Preamble Detection Results • Median number of OBSS packets detected per second is 5 • Equivalent to 20ms deferral out of 1000ms (Txop=4ms) • 2% of the time spent deferring due to OBSS premables. Qualcomm

  7. % of successfully decoded OBSS preambles by all STAs in a BSS • Total successfully decoded preambles in BSS/Total attempted decodes of preambles in BSS • A device has an “attempted decode” of a preamble if the preamble is > -82 RSSI, and the device locks on to the preamble and tries to decode it. •  roughly 10% decode rate for OBSS premabels Preamble Detection Results cont. Qualcomm

  8. 4 channels • 5 STAs per AP • 1 antenna per AP & STA Simulation Setup: Scenario 2 “one room” 29 30 25 26 17 18 21 22 31 32 27 28 19 20 23 24 1 2 5 6 9 10 13 14 3 4 7 8 11 12 15 16 Qualcomm

  9. Simulation Parameters Qualcomm

  10. Whether premable detection is on for OBSS packets or not, shape of curve is similar. • The ED level is the main factor affecting the shape of the tput curves • If OBSS preambles were detected, the dotted black line should match the purple curve Throughput results Qualcomm

  11. % of successfully decoded OBSS preambles by all STAs in a BSS • Total successfully decoded preambles in BSS/Total attempted decodes of preambles in BSS • A device has an “attempted decode” of a preamble if the preamble is > -82 RSSI, and the device locks on to the preamble and tries to decode it. •  roughly 10% decode rate for OBSS premabels Preamble Detection Results cont. Qualcomm

  12. For the simulation run in scenario 1 and scneario 2, OBSS preambles are not decoded very often. • Around 10% of attempted decodes of OBSS preambles are successful • This corroborates the results found in 11-14-1420-01 • Could impact protocols that rely on preamble detection Conclusions Qualcomm

  13. Scenario 1, reuse 1, 1DL • Same parameters as sceneario 1, reuse 3 • Turning Preamble Detection ON for OBSS packets doesn’t change the shape of the tput curve. Appendix ED No PD No PD ED No PD ED ED No PD No PD ED PD ON ED Qualcomm

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