【摘要】 在无线传感器网络应用中,不稳定的通信链路会导致较低的传输可靠性。提出一种基于"动态簇"的无线传感器网络可靠传输协议。此协议利用网络节点部署稠密的特点和无线信道的广播特性,使报文以簇为单位进行转发;各个簇的成员构成多路径以保证传输的可靠性,并通过限定转发簇成员个数来降低冗余传输能耗;簇是动态的,在数据每跳转发前通过"回退竞争"机制选出,完成转发任务后自动撤销。建立了网络仿真模型,用NS2网络仿真系统对此协议的传输性能,如传输可靠性、传输时延及传输能耗,进行了仿真分析。仿真结果表明,此协议的综合性能优于同类协议。更多还原

【Abstract】 In the application of wireless sensor network (WSN), the unstable communication link will lead to much lower transmission reliability. A reliable transmission protocol based on dynamic cluster (DCMP) has been proposed for WSN. Utilizing the characteristic of highly dense deployment of nodes in WSN and broadcast feature of wireless channels, DCMP makes the packets forwarded in the unit of cluster in the process of data transmission. All cluster members constitute multiple paths in order to ensure the transmission reliability, and the number of forwarding members in the cluster is constrained to reduce the energy consumption of redundant transmission. The cluster is dynamic, which is elected through "back-off competition" mechanism before each hop of packet, and upon completion of packet forwarding task, the cluster automatically revoked. The simulation model for DCMP was established, and by using NS2, the simulation analysis of transmission performance of DCMP, such as transmission reliability, transmission delay and transmission energy consumption has been carried out. Simulation results prove the advantages of the proposed protocol in comparison to other similar protocols.更多还原