QoS guarantee towards reliability and timeliness in industrial wireless sensor networks

Wireless Sensor Networks is a promising technology for industrial monitoring and process control. In industry the sensory measures should be delivered to control room in predefined deadline time. The reliable delivery of sensory measure degrades as the focus shift from wired domain to wireless domain. This happens due to unreliability of sensor node and communication link. Therefore, the adverse industrial environment condition posed great stress towards designing of an efficient and effective routing protocol that can ensure the quality of service by reliable and timeliness delivery of real-time data. This paper presents a new geographical routing protocol that works on the basis of two-hop neighbor information. This improves end-to-end packet delivery by minimizing the path setup and recovery latency to ensure the reliability and timeliness. It selects the reliable relay node by mapping packet deadline time to link velocity in such a way that the smaller deadline time packets follow the shorter path over the high speed, reliable links and larger deadline time packets follow path over energy efficient nodes. This process enhances the network life and maintains the shorter path for time critical data routing. This real-time data routing suffers when a forwarding node fails to access the potential relay node. Here, the transmission energy regulation mechanism support to accessing the potential relay node for improving the reliability and timeliness data delivery. The simulation results validate the claim that the proposed routing protocol achieves significant improvement in end-to-end deadline packet delivery ratio with the higher energy efficiency.