A QoS-Aware Routing Protocol for Real-time Applications in Wireless   Sensor Networks
  The paper presents a quality of service aware routing protocol which provides low latency for high priority packets. Packets are differentiated based on their priority by applying queuing theory. Low priority packets are transferred through less energy paths. The sensor nodes interact with the pivot nodes which in turn communicate with the sink node. This protocol can be applied in monitoring context aware physical environments for critical applications. 
Mary Cherian, T.R Gopalakrishnan Nair
cs.NI