The automotive industry is moving aggressively in the direction of advanced active safety. Vehicular safety communications applications cannot tolerate long connection establishment delays before being enabled to communicate with other vehicles encountered on the road. Therefore, the wireless channel access control protocol is of particular concern and needs to be designed efficiently. However, the random contending access medium mechanism is one of the main causes of poor real time performance. In this paper, we illuminate the moving characteristics of vehicle nodes through Mathematic method. Then we propose a strategy about direction-based slots contending mechanism to improve the real time performance. The simulation result shows that the Direction-based Slots Scheduing Strategy can dramatically decrease the effect of opposite nodes to reduce the slot collision probability. At last, we analyse some shortcomings of the proposed strategy.
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