KEYWORDS: Roads, Telecommunications, Data transmission, Data communications, Wireless communications, Power supplies, Analytical research, Antennas, Reliability, Internet
In order to evaluate the impact of communication distance, vehicle speed and line-of-sight on the communication performance of CVIS (Cooperative Vehicle Infrastructure System) based on broadcast Wi-Fi, packet loss rate and communication delay are selected as representative indicators. Via constructing actual road traffic scenes divided into dynamic and static ones according to vehicle speed, and designing 4 test schemes under different communication distance and line-of-sight conditions, the OBU (On-board Unit) and RSU (Roadside Unit) are deployed in the closed test field to communicate with each other. The results show that communication distance and line-of-sight are obvious influencing factors of packet loss rate, but the speed has no great influence on the packet loss rate; the speed, communication distance and line-of-sight have little influence on the communication delay. It can be seen that communication distance and line-of-sight are the important factors that lead to the degradation of communication performance of CVIS.
Information interaction is an important factor affecting the application of cooperative vehicle infrastructure system (CVIS). In order to evaluate the effectiveness level of cooperative vehicle infrastructure system (CVIS) information interaction with closed field test comprehensively and objectively, the analytic hierarchy process and fuzzy theory are used to study the effectiveness level of CVIS information interaction. By analyzing the key factors that affect the effect of CVIS information interaction, an effectiveness evaluation index system for the CVIS information interaction is established. And then, the analytic hierarchy process is used to determine the weight of the influence of different factors on the result of CVIS. By constructing the membership matrix, the fuzzy evaluation model is used to evaluate the effectiveness of CIVS. Finally, the method was experimentally verified by building an CVIS test system on a closed road with a networked vehicle, on-board unit (OBU), roadside unit (RSU) and wireless communication module. The effectiveness level of CVIS information interaction was obtained. The results show that the proposed evaluation results of CVIS information interaction can help to guide the update and development of in-vehicle devices and roadside devices.
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