Mobile Ad Hoc Networks Cognitive Demand Routing Key Technology Research

Cognitive network is an important direction of future network development, part of the network nodes have ability of learning and reasoning which can dynamic make decision and reconstruct the network elements by apperceiving and predicting environmental parameters, to adapt to the network environment and optimize end to end performance. This paper mainly focused on the cognitive routing technology on Ad-Hoc network.Firstly, paper introduces the concept, network design, routing framework and key issues of cognitive network, then presents the routing problems of existing mobile Ad Hoc network, including classification and performance of routing protocols, and the standard of determining quality of a routing protocol: qualitative and quantitative criteria of a routing. Paper also introduces multi-path routing, especially the disjoint which is the biggest difference of multi-path routing and single routing. After that, paper introduces the composition of multi-path routing, including route discovery, route maintenance and transmission distribution.Paper presents a new routing protocol based on DSR source routing protocol on distributed cognitive radio network platform in chapter three, which called capacity aware routing protocol. In this protocol, we introduced a new routing select strategy, which mainly considered two factors: original capacity of the link, and capacity loss of the link which caused by interference. New routing select strategy can achieve the biggest available capacity of the link in destination node. The simulation results show the link selected by new strategy has greater throughput and shorter end-to-end transmission complete time compared with DSR protocol.At the same time, paper proposed a new anti-interference multi-path routing protocol based on AOMDV on-demand multi-path distance vector protocol on mobile Ad Hoc network in the fourth chapter, and introduced each step of the protocol in detail, including route discovery, route selecting and planning, routing maintenance and management. Then according to the proposed routing protocol, we built a network model with forty nodes on the simulation platform OPNET. Then we introduced a scenario with 40 nodes and parameters of the scene. In the analysis of simulation result, we collected 10 statistics including routing and network, reflected the performance of new protocol in many ways. As we can seen from the results, new anti-interference multi-path routing protocol have many features including stable, small latency, transmission speed, long routing life and difficult to interrupt.