Abstract: Opportunistic routing is a new archetype in routing for wireless sensor network, designate the node closest to the target node to route the data. Opportunistic routing has recently fascinated much amenity as it is considered a promising proclivity for enhancing the performance, throughput and fidelity of wireless ad hoc sensor networks. It takes prevalence of the broadcast nature of Wireless sensor network for augmentation of transmission fidelity and network throughput. In this paper, we elucidate the foundation of opportunistic routing and the different regions where it is claimed to be better performer, then we discuss some of the popular routing protocols along with their metrics and contrasting drawbacks. Finally we conclude our paper with the existing issues and their possible remedies.
Keywords: WSN, Opportunistic Routing.