Analysis Of AODV Routing Protocol And Its Application

Wireless sensor network（WSN）is composed of a large number of sensor nodes whichare small, low-cost and low-energy and are capable of computing and networking. Thesesensors can be used for monitoring, sensing, collecting the environment information in thecovered area and transferring the processed data to users. WSN has many featuresincluding flexible deployment, good scalability and high reliability. It can be used in awide range of potential applications, such as national security, environmental monitoring,disaster relief, commerce applications and so on, so both academia and industry are veryinterested in it.Routing protocol takes charge of data transmission from sensor nodes to a sink node,and it is one of key technologies of WSN and has a significant impact on the networkperformance. Ad hoc On-Demand Distance Vector Routing (AODV) is an on-demandrouting protocol that can be used widely. That is to say, AODV protocol needs to establishrouting only when nodes have some data to send. Since AODV does not need to broadcastmessages to maintain routing path between nodes, it reduces the network overheads. Inrecent years, domestic and foreign researchers have proposed many improved AODVprotocols to solve a series of practical problems in the specific environment. With thewireless network moving towards the intellectualization and multifunction, more and moreexperiments and applications show that the existing improved algorithms can’t fully solvethe current practical problems. In the specific circumstance, AODV protocol still needsfurther study.Firstly this dissertation introduces the application background of WSN as well as theresearch achievements in the field. Then based on the detailed study of the AODV protocol,this dissertation proposes two routing optimization algorithms: the percentage of maximumremaining energy routing algorithm (MREP) and the energy-saving routing algorithmbased on link layer (L-AODV). Finally, this dissertation compares and analyses these tworouting optimization algorithms with NS-2. The simulation data show that both MREP andL-AODV reduce the average end-to-end delay and improve the packet delivery rate andnetwork lifetime. The data also indicate that L-AODV has better performance than MREP.