Improvements on Cooperative Retransmission Scheme in Wireless Ad hoc Networks
Shuhui Ma · Beijing Youdian Xueyuan xuebao · 2007
An improved cooperative retransmission scheme based on node cooperative stop and wait automatic repeat request(ARQ) protocol is proposed.In order to avoid ambiguous acknowledgement or negative acknowledgement(ACK/NAK) and diffusion of cooperation process,cooperative and non-cooperative frames are distinguished. Traffic categories within each node are introduced so that cooperative frames can be sent in advance.According to instantaneous channel conditions,the best partner is selected to help the source retransmit data.Analytical and simulation results indicate that improved scheme can alleviate collision problem caused by cooperation,increase probability of successful retransmissions and enhance system throughput.