65 Vertical Handoff System Based on Virtual Device in Vehicle Gateway

Vehicle gateway is the data center of vehicle communication networks, for the sake of connecting the heterogeneous wireless networks such as WLAN and WWAN, vertical handoff is the basic method. Moreover, a virtual network device (VND) is designed and implemented as a mid-layer module between the real device driver and protocol stack. The VND can establish a virtual tunnel between the mobile terminal and remote server. Through the virtual tunnel, the vehicle gateway can choose the appropriate way to connect the remote servers. In order to support the applications in the future, the VND is also designed to support both IPv4 and IPv6. The hardware platform of the vehicle gateway is based on ARM9, and the software is based on ARM-Linux. The instruction of hardware and software are as well as put forward.