On-demand routing protocol based on node’s capacity of access to medium for ad hoc networks

A new metric CAM(capacity of access to medium) was presented based on the retransmit strategy of IEEE 802.11 MAC(medium access control) layer protocol.The characteristic of CAM shows that the MAC layer information can be considered as an indication of congestion degree around a node.Furthermore,a congestion-aware routing protocol based on the proposed metric was developed.In addition,simulation results shows that the new approach can improve the network throughput and reduce the end to end average delay with less overhead.