This paper presents a literature review on WSN networks, in which the capacity of network nodes are limited with respect to energy supply, restricted computational capacity and communication bandwidth. To prolong the lifetime of these sensor nodes, designing efficient routing protocols are critical. Basically, the Routing protocols for wireless sensor networks are responsible for maintaining the routes in the network which ensures reliable multi-hop communication. In this paper, various protocols like Dynamic Source Routing (DSR), Dynamic MANET On-demand Protocol (DYMO), Zone Routing Protocol (ZRP) and Optimized Link-State Routing (OLSR) are discussed along with various comparative parameters like Residual Battery Capacity, Throughput, Average End-to-End Delay and Packet-Delay.
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