Abstract: According to the high demand of real-time and reliability on monitoring power transmission lines, this paper proposes a transmission protocol based on network coding. This protocol makes full use of channel broadcast characteristics and cooperative communication between nodes. It combines the advantages of opportunistic routing and network coding, and applies the classical butterfly structure of network coding into the WSN long-chain topology of transmission line. In the case where the specific receiving state of the packet is not determined, the protocol takes the active network protection mechanism and selects the linear coding packet to transmit as the redundant packet until the node decodes the source packet. Performance analysis and simulation results show that the proposed protocol improves the reliability of data transmission and system throughput, reduces the network transmission delay. And the improved the network performance are obtained.

Key words: power line monitoring, Wireless Sensor Network（WSN）, network coding, opportunistic routing

摘要： 根据输电线路监测对无线传感器网络实时性和可靠性要求高的特点，设计了一种基于网络编码的WSN传输协议。该协议充分利用信道广播特性和节点间的协作通信，结合了机会路由和网络编码各自优势，将网络编码经典蝶形结构应用到输电线路WSN长链拓扑结构中，在节点数据包具体接收状态不确定的情况下，采取主动网络保护机制，选择线性编码包作为冗余包进行传输，直到节点解码出源包。性能分析与仿真实验表明，该传输协议提高了数据传输可靠性和系统吞吐量，缩短了网络传输时延，提升了无线传感器网络的性能。

关键词: 输电线路监测, 无线传感器网络, 网络编码, 机会路由