A new backoff algorithm to improve the performance of IEEE 802.11 DCF

  • Authors:

  • Li Yun;Wei-Liang Zhao;Ke-Ping Long;Qian-bin Chen

  • Affiliations:

  • Special Research Centre for Optical Internet & Wireless Information Networks, ChongQing University of Posts & Telecommunications, ChongQing, China;Special Research Centre for Optical Internet & Wireless Information Networks, ChongQing University of Posts & Telecommunications, ChongQing, China;Special Research Centre for Optical Internet & Wireless Information Networks, ChongQing University of Posts & Telecommunications, ChongQing, China;Special Research Centre for Optical Internet & Wireless Information Networks, ChongQing University of Posts & Telecommunications, ChongQing, China

  • Venue:
  • MSN'05 Proceedings of the First international conference on Mobile Ad-hoc and Sensor Networks
  • Year:
  • 2005

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Abstract

For IEEE 802.11 DCF, Backoff Timers of all stations in the wireless LAN are decreased by the same step if the state of channel is idle, and are paused and resumed at the same time. In this paper, we defined this as the “synchronization” feature of 802.11 DCF. The synchronization feature makes the packet collision probability of 802.11 DCF high. To break up the synchronization, this paper proposes a novel asynchronous backoff algorithm for 802.11 DCF, named asyn-DCF. A Markov model is built to analyze the performance of asyn-DCF. The simulation results indicate that asyn-DCF can decrease the packet collision probability significantly and utilize the channel more efficiently comparing to 802.11 DCF.