Supporting real-time traffic in multihop vehicle-to-infrastructure networks |
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Institution: | 1. University of Kentucky, 261 Oliver H. Raymond Building, Lexington, Kentucky 40506, USA;2. Westat, 1600 Research Boulevard, Rockville, Maryland 20850, USA;1. School of Mechanical Engineering, Chongqing University of Technology, Chongqing, China;2. School of Optoelectronic Information, Chongqing University of Technology, Chongqing, China |
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Abstract: | In this paper, a new Controlled Vehicular Internet Access protocol with QoS support (CVIA-QoS) is introduced. CVIA-QoS employs fixed gateways along the road which perform periodic admission control and scheduling decisions for the packet traffic in their service area. The CVIA-QoS protocol is based on Controlled Vehicular Internet Access (CVIA) protocol that was designed only for the best-effort traffic. The most important contribution of the CVIA-QoS protocol is providing delay bounded throughput guarantees for soft real-time traffic, which is an important challenge especially for a mobile multihop network. After the demands of the soft real-time traffic is met, CVIA-QoS supports the best-effort traffic with the remaining bandwidth. Simulation results confirm that in CVIA-QoS protocol, the real-time throughput is not affected from the best-effort load and its delay is much smaller than CVIA delay when both the real-time and best-effort load exist in the channel. It has been observed that, unlike, CVIA-QoS, IEEE 802.11e with multi-hopping suffers from lower throughput and high number of real-time packet drops. |
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