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Information Technology Journal
Year: 2009  |  Volume: 8  |  Issue: 8  |  Page No.: 1205 - 1212

Auto Rate MAC Protocol Based on Congestion Detection for Wireless Ad Hoc Networks

Wei Wu, Zhongzhao Zhang, Xuejun Sha and Chenguang He    

Abstract: Some auto rate protocols at the MAC layer have been proposed to improve the throughput of Ad Hoc networks with multiple rates support at physical layer. However, all of them neglect the influence of network congestion. The network performance will deteriorate as a result of transmitting data to a congested node. In this study, an auto rate protocol based on congestion detection called auto rate based on congestion detection (ARCD) is proposed. In the ARCD protocol, congestion level is detected at the receiving nodes and fed back to the sending nodes along with the rate selection information and then the sending nodes transmit a limited number of back-to-back packets at appropriate rates. The simulation results show that the ARCD protocol can not only improve the throughput and packet delivery ratio of Ad Hoc networks by taking full advantage of channel condition, but also achieve hop-by-hop congestion control.

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