A Reliable Transport Protocol for Urgent Information in Wireless Sensor Networks

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.