Research On Multi-path Routing Strategy And Verification System Of Heterogeneous Wireless Networks

Nowadays wireless network and transmission technology is extremely complicated, with the development of wireless network technology, continually increasing of user demands, and technological competition among carriers and equipment manufacturers. There are various networks using different technologies and access methods existing around our users. Heterogeneous wireless networks already irreversibly existed. However, heterogeneous wireless network is still in the stage of providing different services individually. So that heterogeneous wireless network convergence and network virtualization technology has become an important technology of improving user experience and using various network resources wisely.This thesis describes the background of different wireless network technology and current condition of heterogeneous wireless network. Then it provides a detailed analysis of heterogeneous network integration technology and briefs the current idea of network virtualization. Subsequently, the routing technology, an important part of network data transmission was introduced. Compared to the traditional routing strategy, multi-path routing strategy has obvious advantages in the transmission reliability and the overall bandwidth performance. But when multiple paths share a link, it would cause interference between each other. Therefore, this thesis considers chosen centralized multi-path path must be ensured that the link does not intersect. Based on this, considering choosing the optimized multi-path set under two constraints—reliability and bandwidth, which means select the maximum total bandwidth link disjoint multi-path sets. Combining with the DPSP algorithm used to solve single constraint problem, approximately solve this problem by constantly adjusting the link parameters. Simulation results showed that the algorithm will approach the best path in iteration, and when network size increases, this algorithm can improve the reliability and bandwidth of multi-path set significantly.Finally, in this thesis we design and verify a kind of video transmission verification system based on wireless Mesh networking which transmits real-time video through wireless Mesh nodes, after studied multi-path transmission technology and its implementation in application layer, transport layer and network layer, combined the background and demands of post-disaster emergency communication.In this system, videos are transmitted through multi hop form by routing forwarding under the Mesh nodes which controlled by the ARM controller and access the public network through the terminal has access to mobile network finally. The reliability of the multi-path transmission technology is verified by lots of test results.