End-to-end throughput optimization in multi-hop wireless ad hoc networks
APCC'09 Proceedings of the 15th Asia-Pacific conference on Communications
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In IEEE802.11-based wireless multi-hop Ad hoc networks nodes need to contend for the shared wireless channel, which could result in congestions and waste the limited wireless bandwidth resource. A novel adaptive backoff algorithm based on network congestion--NCBAB (Network-Congestion Based Adaptive Backoff) in media access control (MAC) layer is proposed. In this algorithm, the node adjusts its backoff mechanism according to the feedback of its next-hop's congestion level during the frame transmission sequence. It increases its minimum contention window of the backoff algorithm when its next-hop gets more severe congestion, and its own contention window decreases with the increasing of backoff stage when it encounters high-level congestion and its next-hop encounters no congestion. The simulation results show that the proposed algorithm can adjust the congested node's packet receiving and transmitting rate, and can remarkably increase the network end-to-end saturation throughput.