Design And Implementation Of Networking Mechanism For Wireless Multi-Mode Gateway

In recent years, with the rapid development of wireless communication technologies, they have been used in a variety of fields such as environment monitoring and emergency communications. Due to the complexity of geographical environment and deficiency of communication facilities, single-mode wireless communication system is difficult to satisfy the requirement of the practical applications. The wireless muti-mode gateway can take advantage of multiple wireless communication methods to guarantee reliable transmission of data. Therefore, it’s an important issue to design and implement a networking mechanism by using wireless muti-mode gateways.In this thesis, we study the wireless multi-mode gateway and mobile ad-hoc network. We design and implement a networking mechanism by using wireless muti-mode gateways based on the routing protocol of mobile ad-hoc network. On the basis of DSDV (Destination-Sequenced Distance-Vector) routing protocol, we optimize the routing selection policy, by using hop count and link quality as metrics. We propose a gateway selection algorithm, which considers multiple factors, including hop count, average round trip time, average packet lost rate of3G wireless network and load of the satellite sending queue. The algorithm uses3G wireless network preferentially, and uses the satellite network as a backup. Finally, we test the networking mechanism on the wireless muti-node gateway and verify the feasibility of the mechanism.