Separation of sensor control and data in closed-loop sensor networks
SECON'09 Proceedings of the 6th Annual IEEE communications society conference on Sensor, Mesh and Ad Hoc Communications and Networks
Bounded delay transmission of different traffic classes in wireless sensor networks
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
Simple solutions for the second decade of Wireless Sensor Networking
Proceedings of the 2010 ACM-BCS Visions of Computer Science Conference
QoS routing in wireless sensor networks—a survey
ACM Computing Surveys (CSUR)
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Data generated in wireless sensor networks may not all be alike; some data may be more important than others and hence may have different delivery requirements. In this paper we address differentiated data delivery in the presence of congestion in wireless sensor networks. We propose a class of algorithms that enforce differentiated routing based on the congested areas of a network and data priority. The basic protocol, called Congestion Aware Routing (CAR), discovers the congested zone of the network that exists between high priority data sources and the data sink, and using simple forwarding rules dedicates this portion of the network to forwarding primarily high priority traffic. Since CAR requires some overhead for establishing the high priority routing zone, it is unsuitable for highly mobile data sources. To accommodate these we define MAC-enhanced Congestion Aware Routing (MCAR), which includes MAC-layer enhancements and a protocol for forming high priority paths on the fly for each burst of data. MCAR effectively handles mobility of high priority data sources at the expense of degrading the performance of low priority traffic. We present extensive simulation results for CAR and MCAR, and an implementation of MCAR on a 48 node testbed.