无线传感器网络中面向紧急信息可靠传输协议

摘要

In surveillance wireless sensor networks, the reliable transport of urgent information is a key issue for accurate reporting of events. This paper studies the characteristics of urgent information, and proposes a Reliable Transport Protocol for Urgent Information (RTP-UI) in wireless sensor network. RTP-UI uses a novel congestion control mechanism, combining the current queue length with the queue length change rate as metric of congestion degree. Each node calculates its congestion degree locally and adopts different rate adjustment (bandwidth allocation) schemes depending on their different states. Extensive simulation results show that RTP-UI provides a high reliable transport mechanism for urgent information.%在无线传感器网络的监测领域,紧急信息的可靠传输成为关键问题.该文研究了面向紧急信息可靠传输的特点,提出一种适用于无线传感器网络的紧急信息可靠传输协议.该协议采用全新的拥塞控制方式,将缓冲区队列长度与队列长度变化率相结合,并引入状态机对节点的拥塞程度进行评估.节点在本地计算其拥塞度,并以此对其工作状态进行划分,进而采用不同的速率、带宽调整策略.仿真结果表明,该协议保证了紧急信息的可靠传输.