| More and more people pay close attention to the study of Intelligent Transportation because of the steadily increasing traffic addidents,and then, the dedicated protocols of Wireless Access in Vehicular Environment(WAVE),which includes IEEE 802.11 p and IEEE 1609.x protocol suite, has been developed to control, manage and coordinate information exchange between the vehicles in order to ensure the safe of vehicles and people.When some vehicles in WAVE need to exchange messages between each other,and they are not within each other’s transmission range,at this moment,they have to request other vehicles between them to transmit messages, it is said that a route must be built between source vehicle and target vehicle for completing the transmission of messages. The stability and durability of this route directly determine the efficiency of transmission because of the high mobility and rapid changes of topology in wireless access vehicular environment.It is assumed that, when two nodes A and B communicate with each other for data exchange, node B has moved out of the transmission range of node A before the reaching of the next coming data, and for the moment, node A doesn’t know that in a timely manner; if using t indicates the moment of leaving the range for vehicle B, and T means the moment for node A choosing a new one as it’s next hop after he has discovered B is not within it’s transmission range.So the waste time between T and t caused by route interruption decreases efficiency of information transmission. To solve the problem, this paper,considering the factors of vehicle time, speed and distance, try to give a prediction method for route interruption and verify its effectiveness by simulation experiments. |
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