Research On AODV Routing Protocol Of Wireless Network

Ad hoc networks are self-organizing networks that can be organized anywhere and at anytime without the aid of centralized administration. Due to this characteristic, Ad hoc networks is used more widely, such as disaster recovery, crowd control, search and rescue, and automated battlefields are typical examples of where ad hoc networks are deployed. Self-organized network, don't need any established network infrastructure.Ad hoc networks are self-organizing, multi-hop, topology dynamic-changed wireless networks. This particularity made it impossible that the technology of traditional wire networks used directly in Ad hoc networks, due to this, many new protocols and technologies are required for ad hoc networks, such as MAC protocol, route technology, Qos system, safety, channel connection technology and so on.The actuality and prospect of Ad hoc networks are summarized in chapter one of this paper, including the definition, characteristic, application fields and critical technologies of Ad hoc networks. Then based on Ad hoc networks, this paper gives a particular analysis of AODV routing protocol, compares some relevant network protocols with AODV such as DSDV, DSR. AODV, as the synthesis of DSDV and DSR, depends on middle nodes to establish and maintain route table, uses sequence number to avoid the appearance of route circle, supports the function of group broadcast and QoS, uses IP address, depends on the network link and dosen't support single orientation channel. Furthermore, this paper analyses the capability of AODV routing protocol by testing end-to-end average delay, data package transmission ratio and route cost in different network environment with NS-2, and draws a conclusion that AODV routing protocol has a bigger route cost. There is an obvious increase in route cost with the expansion of the network overload.