基于NS2的AODV協(xié)議研究與改進
[Abstract]:Mobile ad hoc network (Mobile Ad Hoc network,MANET) as a wireless communication network with no central base station and random movement of nodes, The irregular change of topology and the limited energy of nodes make routing protocol design a key problem in Ad Hoc networks. As the representative of on-demand routing protocol in Ad Hoc network, AODV protocol can quickly establish a route in the network, but because of the limited energy of nodes and frequent changes in topology, the established route may break at any time. It affects the performance of the network, so the research on AODV protocol is very meaningful. Firstly, the research background and development status of Ad Hoc network routing protocol are described in this paper. Then the main classification of Ad Hoc network routing protocol is introduced, and the parameters and performance of different categories are compared, and then the on-demand distance vector routing (Ad Hoc On-demand Distance Vector Routing, in Ad Hoc network is compared. The frame format and working mechanism of AODV) are analyzed in detail. Finally, the classical AODV protocol is improved. The first scheme, because the traditional AODV protocol has only one communication link, needs to rerun the routing discovery process when the link breaks, which will seriously affect the performance of the network. In this paper, the AODV protocol (Smart Selection of Primary and Backup for Ad Hoc On-Demand Distance Vector Routing,SSPB-AODV, which intelligently selects the main backup route, is studied. By adding a backup route, and by analyzing the historical data, Intelligent choice of switching route or repair route: for the main route, when the route is interrupted, the local repair or switching to the backup route will be selected according to the historical data; For backup routing, after the route is disconnected, whether to fix the route or send a routing error to the source node is processed by the source node according to the historical data. The simulation results under NS2 show that the SSPB algorithm improves the packet delivery rate, reduces the end-to-end delay, routing initiation frequency and routing overhead. The second scheme, because the bandwidth and energy are extremely limited in Ad Hoc networks, requires the design of routing protocols to take energy and load conditions into account. In this paper, a AODV protocol (Measure Energy and Load Based on Hop Cost,EL-AODV based on hop cost to measure energy and load is studied, which represents the residual energy and load of nodes in the form of hop cost, and combines the hop number of the link itself. The link with the smallest total hops is selected as the communication link, which reduces the creation of routing on the nodes with small remaining energy and serious congestion, optimizes the energy in the network and balances the load in the network, and improves the performance of the network. According to the simulation results of NS2, the EL-AODV protocol improves the packet delivery rate and the residual energy of the nodes, and reduces the end-to-end delay and routing overhead.
【學位授予單位】:西安電子科技大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TN929.5;TN915.04
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