Research On The Technologies Of Mobile Ad Hoc Networks Accessing Internet With Dynamic Gateways

Mobile Ad Hoc network is composed of wireless mobile nodes which can communicate with each other, completely organize, and configure on its own. It is easy to implement in the future wireless mobile communication field and plays an increasingly important role. With the continuous development and expansion of the scope of application of mobile Ad Hoc networks technology, accessing to the existing network anytime and anywhere has become a demand of the users in mobile Ad hoc networks. Only mobile Ad Hoc networks interconnect with other networks, can it truly performance it’s potential and thus improve the user ability to access information. Mobile Ad hoc networks application with access to Internet has been growing concern. The interconnection between mobile Ad Hoc network and Internet not only can extend the applications field of a mobile Ad hoc network, but also provide greater coverage with wireless access to Internet.Mobile Ad Hoc network access to the Internet method based on the dynamic gateway is proposed. Firstly, we determine the number of the dynamic gateway, and select a certain number of dynamic gateways as access point to complete communication on the basis of the information from candidate gateway node and the link parameters by the method of multi-objective decision. At the same time, the dynamic gateway survival time prediction methods are proposed to increase the stability of the network and improve the performance of the network access. Secondly, the establishment of the multipath routing improves the bandwidth and throughput of the network. In order to make the network and dynamic gateway load balance, the two kinds of flow rate distribution according to the different direction of transmission is used. If the data is transmitted from mobile Ad Hoc network to the Internet, the flow distribution is decided according to each route choice probability. Otherwise, the load is balanced for the dynamic gateway according to the dynamic gateway integrated assessment index proportion. Therefore, the dynamic gateway is used reasonability. Finally dynamic gateway survival time is added to the routing maintenance so that the network can replace or maintenance the links before links failure in advance.Through the network simulation software NS2, we compare simply use dynamic gateway for single path of transmission method and simply use access gateway for more dynamic way transmission method from an average delay, network cost and group delivery rate. The results show that the proposed algorithm has better performance.