Journal of Computer Science

History Based Contention Window Control in IEEE 802.11 MAC Protocol in Error Prone Channel

Ali Balador, Ali Movaghar and Sam Jabbehdari

DOI : 10.3844/jcssp.2010.205.209

Journal of Computer Science

Volume 6, Issue 2

Pages 205-209


Problem statement: IEEE 802.11 Medium Access Control (MAC) protocol is one of the most implemented protocols in this network. The IEEE 802.11 controls the access to the share wireless channel within competing stations. The IEEE 802.11 DCF doubles the Contention Window (CW) size for decreasing the collision within contending stations and to improve the network performances but it is not good for error prone channel because the sudden CW rest to CWmin may cause several collisions. Approach: The research to date has tended to focus on the current number of active stations that needs complex computations. A novel backoff algorithm is presented that optimizes the CW size with take into account the history of packet lost. Results: Finally, we compare the HBCWC with IEEE 802.11 DCF. The simulation results have shown 24.14, 56.71 and 25.33% improvement in Packet Delivery Ratio (PDR), average end to end delay and throughput compared to the IEEE 802.11 DCF. Conclusion: This study showed that monitoring the last three channel status achieve better delay and throughput that can be used for multimedia communications.


© 2010 Ali Balador, Ali Movaghar and Sam Jabbehdari. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.