Opportunistic MANETs: Mobility Can Make Up for Low Transmission Power

October 15, 2013 Comments Off Posted in: Final year projects

ABSTRACT:
Opportunistic mobile ad hoc networks (MANETs) are a special class of sparse and disconnected MANETs where data communication exploits sporadic contact opportunities among nodes. We consider opportunistic MANETs where nodes move independently at random over a square of the plane. Nodes exchange data if they are at a distance at most within each other, where is the node transmission radius. The flooding time is the number of time-steps required to broadcast a message from a source node to every node of the network. Flooding time is an important measure of how fast information can spread in dynamic networks. We derive the first upper bound on the flooding time, which is a decreasing function of the maximal speed of the nodes. The bound holds with high probability, and it is nearly tight. Our bound shows that, thanks to node mobility, even when the network is sparse and disconnected, information spreading can be fast.

EXISTING SYSTEM:
The impact of node mobility in data propagation is currently one of the major issues in network theory. The new trend is to consider node mobility as a resource for data forwarding rather than a hurdle. This is well captured by the model known as opportunistic mobile ad hoc networks (opportunistic MANETs), an interesting recent evolution of MANETs. Several emerging application scenarios can be considered as instances of opportunistic MANETs, such as vehicular networks (at least when traffic density is not high), certain types of mobile sensor networks, and pocket switched networks. The latter type of network is formed by powerful handheld devices—able to establish direct wireless communication links through, e.g., a Wi-Fi interface—carried around by humans in their everyday life.

DISADVANTAGES OF EXISTING SYSTEM:
· The term opportunistic also refers to the fact that the communication protocol does not control node mobility (think about cars, bikes, or pedestrians), however mobility can be exploited. This is the main reason why the energy consumption due to node mobility is not considered in the protocol analysis.
· Data communication can benefit from node mobility even though all the snap shots of the network are not connected.

REFERENCE:
Andrea Clementi, Francesco Pasquale, and Riccardo Silvestri “Opportunistic MANETs: Mobility Can Make Up for Low Transmission Power”- IEEE/ACM TRANSACTIONS ON NETWORKING, VOL. 21, NO. 2, APRIL 2013.

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