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With the increasing demand of communication, it is of great necessity to maximize the utility of vehicular network. VANETs (Vehicular Ad-hoc NETworks) especially in the context of high mobility attract more attention all over the world. Pure Vehicle-To-Vehicle(V2V) networks may relatively have long delay and worse performance compared to Vehicle-To-Infrastructure(V2I) networks, while V2V networks have larger communication area. Consequently, vehicular network integrated with 3G network is of significance. In these networks, gateways are generally used as interfaces between hybrid networks, thus gateway selection becomes the primary challenge.
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