Opportunistic routing (OR) is an upcoming and promising routing technique for wireless multihop networks. The key concepts behind OR is overhearing and cooperation among relaying nodes; therefore, OR works well in wireless multihop networks with higher node density, such as mesh or sensor networks. OR enables multiple routes and dynamic relay selection, thus, it obtains higher link reliability ...

In this paper we discuss about how to increase the reliability, energy-efficiency in a wireless sensor network. Since energy saving has become the top factor on demand due to the increasing multimedia services in mobile devices. The existing batteries unfortunately do not provide the desirable lifetime. Therefore reducing energy consumption has become very crucial factor in all the tasks the mo...

In Opportunistic Networks (OppNets), mobile devices transmit messages by exploiting the direct contacts, without the need of an end-to-end infrastructure. Disconnections of nodes and high churn rates are normal features of opportunistic networks. Hence, routing is one of the main challenges in this environment. In this article, we provide a survey of the main routing approaches in OppNets and c...

In opportunistic routing, each node maintains a group of candidate relays to reach a particular destination, and transmits packets to any node in this group. If a single candidate relay receives the packet, it becomes the effective relay to forward the packet further. If no candidate receives the packet, then the current sender re-transmits. If multiple candidates receive the packet, then the l...

Mobility intertwines with routing protocols play a vital role in opportunistic networks. First and foremost, mobility creates opportunities for mobile nodes to connect and communicate when they encounter. A series of encounter opportunities can spread a message among many nodes and to a large area until eventual delivery. Further, mobility properties, when utilized by routing protocols, can gre...

Opportunistic networks are sparse wireless networks which have no complete path from the source to the destination most of the time. Many applications require the support of delay constrained routing mechanism which can provide acceptable and resilient services in the challenged environments. We proposed Adaptive Seed Spray (ASS) to achieve the delay constraint with low cost in dynamic opportun...