Study Of Routing Protocols With Low Overhead In Wireless Sensor Networks

As a special type of wireless ad hoc network, a wireless sensor network (WSN) consists of a number of low-cost and mini sensors which are deployed in the working field to sense the surrounding environment. Via cooperation the sensor delivers the sensed packets to the observer in a multi-hop way.The thesis is focused on the routing protocol in large-scale wireless sensor networks. Firstly some background information about the wireless ad hoc network is introduced, followed by the classification of routing protocols in such networks with an emphasis on the principles of AODV (Ad hoc On demand Distance Vector). After that a new and scalable routing protocol named AODV-RIRC (AODV with Route Identification and RREP Capturing) is proposed for large scale WSN by combining the strength of AODV, AODV-LLF (AODV with Link Layer Feedback) and AODV/Jr. Via simulation it is proved that AODV-RIRC outperforms the other three routing protocols in scaling up the network.Moreover, the thesis studies the adaptive adjustment of parameters in the current routing protocols. A novel routing protocol, named as FL-AODV (Fuzzy Logic AODV), is proposed by utilizing fuzzy logic to adjust HELLO_INTERVAL adaptively, which avoids the complexity brought by utilizing mathematical model. Finally the effectiveness of FL-AODV is verified through simulation comparing with the fixed HELLO_INTERVAL of AODV.