The Delay Tolerant Networks (DTN’s) are wireless ad-hoc networks which is connected intermittently. The DTNs allow the communication between two or more wireless nodes in the situation in which the end to end connectivity cannot be achieved or rarely achieved. The DTNs are also known as the opportunistic networks. The DTNs are best applicable or suitable in an environment which is infrastructur...

In underwater wireless sensor networks (UWSNs), the nodes are sparsely deployed over a large sea area due to their high design cost and manufacturing cost. Opportunistic routing protocols promising forwarding technique for various UWSNs. However, many opportunistic suffer from void problem in sparse scenarios. Hop count-based inherently alleviate this by periodically maintaining topological inf...