A System For Multiple Mobile Devices Synchronizing In Distributed System

For current generation of PDA and smart phone devices, wireless capabilities are practically a standard feature. More and more mobile devices are connecting to the wireless network. We need to synchronize data among all these devices. First, we make the devices which need to be synchronized to construct a distributed network; then we do the synchronizing job in this network. But the wireless network is very unstable and cost very much, at the same time it has low capacity and weak computing capability. In case of all these weak points of the wireless network, we decided to use AdHoc protocol to construct the distributing network without infrastructure. In traditional distributing network, partition is typically treated as an exceptional and transient condition. The situation in AdHoc network is completely reversed. Each AdHoc group is an isolated network, partitioned from all other AdHoc group in the network. Software design in this environment faces new challenges. We need a well designed system to do the synchronization based on the AdHoc.This dissertation has analyzed many synchronization protocols and also many network topologies, after that it proposed a system for multiple mobile devices synchronizing in the disturbed network. This system has two major modules which one is for contributing a distributed network and the other is for the data synchronization. Data synchronization works on the distributed network module and the message dispatched in the distributed network is working as a signal for the data synchronization module. Both of these two modules work independently and also they corporate very well. This system is easy to implemented and taking few resources. This dissertation has detailed how the system was planned, implemented and tested.