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Evaluation of Protocol efficiency

Evaluation of Protocol efficiency. Alan Winkowski BreezeCOM Ltd. Introduction. New PHY’s defined lately in 802.11, while MAC remained static Efficiency was analyzed for different packet sizes as well as different transaction scenarios Analisys was performed on a transaction basis

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Evaluation of Protocol efficiency

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  1. Evaluation of Protocol efficiency Alan Winkowski BreezeCOM Ltd. Alan Winkowski, BreezeCOM Ltd.

  2. Introduction • New PHY’s defined lately in 802.11, while MAC remained static • Efficiency was analyzed for different packet sizes as well as different transaction scenarios • Analisys was performed on a transaction basis • Substantial degradation in protocol efficiency Alan Winkowski, BreezeCOM Ltd.

  3. Efficiency calculation • ND = Amount of Network Data • 60, 400 and 1500 bytes Data Packets • TrD = Transaction duration • DFC (Data-Ack and RTS-CTS-Data-Ack) • PCF (CF-Poll{+Data}-CF-Ack{+Data}) • NDR = Nominal Data Rate • 2Mbps, 11Mbps, 24Mbps and 54Mbps Alan Winkowski, BreezeCOM Ltd.

  4. DFC Efficiency values • Events like Collisions and Backoff were not considered, thus efficiency is actually lower Alan Winkowski, BreezeCOM Ltd.

  5. DCF: Data-ACK Alan Winkowski, BreezeCOM Ltd.

  6. DFC: RTS-CTS-Data-Ack Alan Winkowski, BreezeCOM Ltd.

  7. PCF Efficiency • Protocol performance depends on protocol flow • Flow simulation is required • packet length: 400 bytes • Mix of different transactions: • A. Data (CF-Poll) - Data (CF-Ack) • B. CF-Poll - Data (with CF-Ack on next poll) • C. Data (CF-Poll) - CF-Ack (No Data) • D. CF-Poll (No Data) - PIFS Alan Winkowski, BreezeCOM Ltd.

  8. PCF Efficiency - simulation Alan Winkowski, BreezeCOM Ltd.

  9. Conclusions and Recommendations • Quantitative efficiency degradation in all scenarios analyzed • Possible improvements proposed: • Greater frames for Data and Control information (specially in short frames) • Aggregation of feedback information • Scheduling in advance by the AP (PCF improvement) Alan Winkowski, BreezeCOM Ltd.

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