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S K A Khan, M Adeel, M A AzamAbstract
In reality, mobile ad-hoc networks are highly unpredictable because any node can join or leave the network at any time, thus making reliable and effective communication a problem. This issue is addressed by introducing new breed of ad-hoc networking, known as opportunistic networks. Opportunistic networking is a concept that has evolved from mobile ad-hoc networking. In opportunistic networks nodes have no prior knowledge of routes to intended destinations. Any node in the network can be used as potential forwarder with the exception of taking information one step closer to intended destination. The forwarding decision is based on the information gathered from the source node or encountering node. The opportunistic forwarding can only be achieved if message forwarding is carried out in store and forward fashion. Although, opportunistic networks are more flexible than traditional MANETs, however, due to little insight of network, it poses distinct challenges such as intermittent connectivity, variable delays, short connection duration and dynamic topology. Addressing these challenges in opportunistic network is the basis for developing new and efficient protocols for information sharing. This paper presents a conceptual study for opportunistic networks to improve the overall message delivery at destinations while keeping the communication cost very low. Some assumptions are considered to improved directivity of message flow towards intended destinations. These assumptions exploit human social relationships analogies such as popularity and use of hybrid communication by applying opportunistic concepts on top of traditional ad-hoc routing such as AODV to gain maximum message directivity. The experiment results have shown that by combining traditional ad-hoc routing with opportunistic forwarding has not only improved directivity but as a result have achieved a great improvement in message delivery to intended destinations.Read More on Global Digital Library