The Research And Implementation Of Realtime Business Wireless Multi-hops Access Technology Based On Multi-Paths Routing

As information technology development, people's demand for mobile communication is growing. Mobile Ad hoc network with no central infrastructure and allow nodes to move is especially suitable for the case of needing for rapid network deployment or dynamic re-configuration but lack of cable networks, Ad hoc network has special significance for the military and emergency communications network , for example, In the fire scene, The real-time video will be transmited to the command center to facilitate timely through a temporary arrangement ad hoc network,and accurately grasp the situation at the scene of fire, enhance rapid response capacity and minimize losses.In this paper, we make a in-depth study on the Ad Hoc network multi-path routing technology.We turn first to the Ad Hoc network outlined, followed by the Ad Hoc network's main routing technologies, including single-path routing and multi-path routing, In particular, we made a more detailed analysis and comparison on several of the commonly used multi-path routing technologies.Then we carefully analyze the existing two types multi-path transmission, the back-up(redundancy) multi-path transmission and the parallel multi-path transmission, and find that the back-up(redundancy) multi-path transmission in the good quality of the link will be forwarded too many redundant packets, and parallel multi-path in the worse quality of the link required a lot of redundancy to enhance the end-to-end reliable transmission, so we proposed a new multi-path transmission scheme: the collaborative multi-path transmission. Hope that through collaboration among intermediate nodes to improve the success of end-to-end delivery rate, reduce redundancy and queue length,so to reduce end-to-end delay. In a simple four nodes of the network topology, we have Derived from theoretical analysis of the end-to-end delivery success rate and the end-to-end average packets to send for the back-up(redundancy) multi-path routing, the parallel multi-path routing and the collaborative multi-path routing ,and the quality of the link between intermediate nodes on the effects of collaboration, found that the collaborative multi-path scheme has the better the end-to-end delivery success rate, and not as the other two schemes to forwarding too many redundancy packets, But the prerequisite is the correct collaboration.Then we built a network platform based on a dynamic source routing protocol (DSR) in the actual wireless router, we achieved the multi-path source routing by the revision of some mechanism of dynamic source routing protocol. And then we implemented link quality estimated by the link State broadcast and the multicast mechanism by specified the collaboration node in the packets to achieve the implement of the collaborative multi-path scheme, then we make a comparison with the parallel multi-path routing in the indoor test, and decide the next step of research according to test results.