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Development of Vehicular Ad hoc NETworks (VANETs) has drawn intensive attention in recent years. Designing routing protocols for Vehicle-To-Vehicle (V2V) communication in VANET may suffer from frequent link change and disconnection. Vehicle-To-Infrastructure (V2I) communication can overcome the challenge by relaying packets through the backbone network, but is limited to those areas where a RSU exists. In this paper, the authors present a position-based routing protocol, named Mobile-Gateway Routing Protocol (MGRP), for VANETs. The MGRP combines V2V and V2I communications, and utilizes certain vehicles as mobile gateways. Each mobile gateway connects with a base station through a 3G interface and communicates with other vehicles without the 3G interface through an IEEE 802.11 interface.
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