Abstract: Aiming at node energy consumption problem in Directed Diffusion(DD) routing protocol, this paper proposes an improved DD routing protocol. It is used for dispersed optimizing flooding diffusion of the detecting packet. The improved DD protocol limits the source node and each forwarding node diffusion breadth by defining the gradient threshold, and controls diffusion depth by using the set of path delay parameter. Simulation results show that the improved DD protocol can reduce the data packet amount, and improve the utilization rate of network energy.

Key words: Wireless Sensor Network(WSN), Directed Diffusion(DD), shortest path, gradient threshold, delay

摘要： 针对定向扩散(DD)路由协议节点能量开销较大的问题，提出一种改进的DD路由协议，用于对探测分组的洪泛扩散进行分布式优化。通过定义梯度阈值限制源节点及每个转发节点的扩散广度，利用设定路径时延参数的方式控制扩散深度。仿真结果表明，改进协议能减少建立梯度时的数据信息包数量，提高节点能量利用率。

关键词: 无线传感器网络, 定向扩散, 最短路径, 梯度阈值, 时延

CLC Number: 

• TP393