关键词: 协作通信, 网络编码, MAC协议, 候选协作中继节点, 链路质量, 传输能耗

Abstract: Abstract: To deal with the problems that the control signaling message sent by the candidate cooperative relay node of the NCAC-MAC protocol can’t make the other nodes stop backing off thanks to they are not in the communication range and not taking the transmission energy consumption of the node into consideration for the in the current Ad hoc network, an high efficiency MAC protocol (HECNC-MAC) based on cooperative network coding is proposed. Three improvement mechanisms were presented by the protocol: Firstly, it avoids selectting the node with poor link quality as the candidate cooperative relay node, than reducing the number of competing relay nodes. Secondly, when calculating the utility value, it considering the transmission energy of the node , which can effectively enhance the survival time of network ; Finally, the destination node replies the conformation message through the pseudo-broadcast,and it cancel the ETH signaling message. Theoretical analysis and simulation results show that in the comparison experiments with the the existing CSMA, Phoenix and NCAC-MAC protocols, HECNC-MAC protocol can effectively reduce the transmission energy consumption of nodes and the delay of end-to-end and improve the network throughput as the same time .

Key words: Keywords: cooperative communication, network coding, MAC protocol, candidate relay node, link quality, transmission energy consumption