基于VPN的车载网关异构无线网络切换系统

System of vertical handoff for heterogeneous wireless network based on VPN on in-vehicle gateway

设计和实现了在嵌入式Linux车载网关中基于VPN(Virtual private network)的异构无线网络切换系统。车载网关中使用支持802.11协议的无线网卡连接无线局域网和支持CDMA的无线通信模块来连接无线广域网,软件上采用虚拟网络接口来实现上层应用程序通信与底层协议的无关性,从而实现了这种异构无线网络的无缝衔接,提高了网络利用效率。实验结果表明,该系统简单有效,适用于低能耗、低运算能力的车载系统中。

A system of vertical handoff for heterogeneous wireless network based on （Virtual Private Network （VPN） on in-vehicle gateway was designed and implemented. It provides a Wireless Local Area Network （WLAN） card, which supports 802.11 protocol on the in-vehicle gateway, and a Code Division Multiple Access （CDMA） wireless communication module to support both WLAN and Wireless Wide Area Network （WWAN）. A virtual network interface was implemented to achieve the independence between the application level program communication and low-level protocol, so that it can realize seamless connection of the heterogeneous wireless networks. Experiment results show that this in-vehicle gateway system can be widely applied in in-vehicle system with low power consumption and low operational ability.