Interest earliest arrival first directed diffusion in WSNs

In directed diffusion a sensor node finds the next hop node from its neighbor nodes randomly in proportion to the gradients being created during Interest diffusion. However, some alternative paths may contain redundant nodes, leading to energy waste. This paper proposes a simple approach to reinforce the path without redundant node. A node always selects the neighbor from which it first received Interest as the next hop node. And a dynamic energy threshold is adopted to balance nodes energy consuming by keeping the nodes with lower energy from being selected. Simulation results show this approach can achieve better performance in terms of energy saving and reliability in both single-sink-single-event and multi-sink-multi-event scenarios, respectively.