【摘要】 针对无线传感器网络中不可靠的通信链路引发传输效率下降的问题,提出了一种基于相邻节点协作的无线传感器网络可靠传输方案(NNCS).该方案利用无线信道的广播特性,通过选择成功监听到数据传输的相邻节点来承担协作传输任务(重传或转发),以降低重传次数,提高传输效率.在方案中,相关节点根据自身传输能力发送数据应答以竞争协作机会,同时通过信道监听避免发生竞争冲突.实验结果表明,较之传统重传方案,NNCS能够以更少的传输消耗达到更高的传输成功率,并有效降低了端到端的传输时延.更多还原

【Abstract】 To solve the transmission efficiency degradation problem in wireless sensor networks(WSN) due to unreliable communication links,a novel scheme NNCS that is based on cooperation among neighboring nodes is proposed for reliable data delivery in WSN.The NNCS exploits the broadcast feature of wireless channels,and passes the retransmission or forwarding responsibility to a neighboring node that has successfully snooped the data transmission,so as to achieve better transmission efficiency by reducing retransmission times.In the NNCS,related nodes compete for cooperation tasks by sending data acknowledgement according to their transmission capabilities,and snoop the channel activities to avoid interference in competition.The simulation results show that,compared with the traditional retransmission-based scheme,the NNCS can achieve a higher transmission success probability with lower cost,and effectively reduce the end-to-end transmission delay.更多还原