ITS supporting mobile communication system

ima paper itsc2014

IMA's distinguished routing depends heavily on real-time traffic data, which is collected by sensors on vehicles and users smartphones. Essential traffic data including GPS, vehicle acceleration and status data are reported to IMA platform over wireless communication networks. However, this large amount of traffic data poses a serious problem of network resource competition with mobile users regular data communication. We design and develop a mobile communication system, which supports offloading traffic data from cellular network to smaller radio networks of RSUs. The data flow splitting is archived by an end-to-end network virtualization. On one end, the embedded pc on vehicle makes use of both cellular and wifi networks for data upload. Here we virtualize both access networks and implement an adaptive network selection for user and traffic data packets. Amongs others, our selection algorithm takes into account QoS for user data, real-time constraint for traffic data, and availability of RSUs coverage. On the other end, we employ SDN and openflow technologies in back-haul and core network for priotized routing of data to IMA platform. We further enhance the reliability of the communication system. First, we implement a novel multicast technique on the AP installed at RSUs. The APs greatly increase the amount of data exchange with associated vehicles in a short period of time. This directly addresses sporadic connection patterns between vehicles and RSUs. Secondly, we employ delay tolerant caching between vehicles and RSUs to compensate with frequent connection lost caused by high mobility and improve quality of local data services. As a result, we could achieve high communication for demanding ITS data communication. Our design is open and compatible with future radio access network operating model. This design makes it easy to integrate available micro-cell infrastructure to extend the offloading network. On the other hand, the offloading network also open to serve consumer data communication other than traffic data services. This is crucial to encourage the deployment and sharing of offloading infrastructure, which also benefits ITS.