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This paper focuses on Vehicle To Roadside unit (V2R) communications in vehicle networks based on IEEE 802.11 DCF MAC protocol. The main challenge is due to the short residence time of the moving vehicle within the coverage of each stationary RSU. As a result, the contentions among vehicles during this short period of time dramatically degrade the system performance. In this paper, the authors propose a new mechanism called Proxy-based Vehicles to RSU access (PVR) for V2R communications. This protocol is designed to exploit collaborative and opportunistic forwarding between any two spaced apart RSUs and to emulate back-to-back transmissions within the coverage of RSU.
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