According to characteristics that the vehicles move fast and topology changes quickly in Vehicular Ad hoc Networks (VANETs), a novel routing protocol GMGP based on the location is proposed for VANETs. Predicting the changes of the neighboring nodes positions and using greedy forwarding mechanism forward packet, and using a movement perimeter forwarding algorithm to select the next reliable hop node on the basis of direction and velocity of the mobile nodes when the greedy forwarding fails, it improves the reliability of routing. When a more realistic vehicles mobility model is applied to the NS-2 simulation platform, the simulation indicates that the improved routing protocol has better performance than the GPSR routing protocol.
Based on the characteristics of the car-following model and analyzing from the angle of traffic engineering, this paper classifies car following models into four categories, that is, the stimulus-response model, the safe-distance model, the psychology-physiology model and the artificial intelligence model. In addition, it expounds the modeling ideas, the model structures as well as the advantages and disadvantages of these models. Finally it points out the development tendency and the direction of study method of modeling of car-following model to show direction and provide important reference for establishing car-following models suitable for Chinese traffic characteristics.
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