SESRT: Score based Event to Sink Reliable Transport in wireless sensor networks

Wireless sensor networks often consist of hundreds or thousands of sensor nodes. One of the main applications of these networks is event-based applications. Therefore, the reliable event detection at sink is one of the major issues. The mechanism of providing reliability of event based applications is end-to-end reliability. And besides, to reduce the energy consumption and no need to receive all data packets, the reliability of this sort of applications is Loss Tolerant Reliability (LRT). Towards the Two major tasks of transport layer which are reliability and congestion control, most of the proposed event based methods, try to adjust the reporting rate of event-nodes, the same. In some other methods, the nodes´ rates are different but it is only based on the network´s congestion or the distances from the event. Therefore, these methods do not take into account a report adjusting method based on the quality of data generated by event-nodes. In this paper, we proposed Score based Event to Sink Reliable Transport (SESRT) which is an event based protocol that adjusts the reporting rate of each event-node considering the energy and the node´s distance to event to ensure the quality of data. The simulation results show that our proposed method consumes less energy and needs less number of data packets to achieve the application´s demanded reliability in compared to ESRT. And besides the weight to the number of packets ratio sent by event-nodes, is always more than ESRT method.