LAUSR

Routing in underwater acoustic network is challenging because of longer delays and mobility caused on account of ocean currents and tides. Existing algorithms focus only on delivery of packets with very little consideration to minimising packet delay. In this paper, we propose a new beacon-based routing algorithm for underwater sensor networks using multiple sink architecture. Delay minimising depth-based routing (DMDBR) attempts to minimise delay and uses depth, hop count and residual energy for making routing decisions. Novelty of our scheme is in a node accepting packets for forwarding only if it has sufficient energy for forwarding all the packets in the packet queue. A node declines acting as a forwarder once the estimated residual energy is insufficient to forward the new packets. Simulation results show that DMDBR improves packet delivery ratio and lowers end-to-end delay in comparison to depth-based routing.