Topology-based Efficient Downstream transport in wireless sensor networks

One-to-many (Downstream) transport in wireless sensor networks is illustrated by single node (sink) sending information to a number of sensor nodes. These nodes can be thrown or scattered randomly in the sensor field. Therefore, the topology i.e., density and node arrangement, can be unpredictable in different regions. In this work, we present a new Topology-based Efficient Downstream Communication (TEDT) protocol. TEDT uses controlled flooding for reliable data dissemination and NACK based error recovery schemes. The protocol operation is based on commonly referenced Pump Slowly Fetch Quickly (PSFQ) protocol. However, the frequency of NACKs and error recovery in TEDT protocol is dependent on the arrangement of nodes within the sensor field. We demonstrate in our simulation results that using an appropriate NACK frequency according to the topology of the nodes increases reliability while decreasing overhead, latency, and energy consumption.