Evaluation of Protocol efficiency

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Presentation transcript:

Evaluation of Protocol efficiency November 1999 Evaluation of Protocol efficiency Alan Winkowski BreezeCOM Ltd. Alan Winkowski, BreezeCOM Ltd.

Introduction Analisys was performed on a transaction basis doc.: IEEE 802.11-98/xxx Month 1998 November 1999 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. John Doe, His Company

Efficiency calculation November 1999 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.

November 1999 DFC Efficiency values Events like Collisions and Backoff were not considered, thus efficiency is actually lower Alan Winkowski, BreezeCOM Ltd.

November 1999 DCF: Data-ACK Alan Winkowski, BreezeCOM Ltd.

DFC: RTS-CTS-Data-Ack November 1999 DFC: RTS-CTS-Data-Ack Alan Winkowski, BreezeCOM Ltd.

PCF Efficiency Protocol performance depends on protocol flow November 1999 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.

PCF Efficiency - simulation November 1999 PCF Efficiency - simulation Alan Winkowski, BreezeCOM Ltd.

Conclusions and Recommendations November 1999 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.