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中文摘要：
本文针对车载通信网的特点，首先分析传统TCP在VANET环境下存在的问题，给出四状态转移图，在此基础上提出一种新的基于跨层设计的TCP拥塞控制机制：VC—TCP。通过向传输层提供有用的路由信息及车辆运动信息，预测分组丢失的原因。并针对不同情况采取不同的TCP拥塞控制策略。仿真结果表明，改进后的VC—TCP在车载通信网环境下性能有较大提高，吞吐量、时延均得以改善。
英文摘要：
Based on the characteristics of Vehicular Communication Network, this paper analyzes the problem of traditional TCP in VANET,and by giving the four-state transition diagram,a new TCP congestion control mechanism based on Cross-layer design is proposed. It is called VC-TCP,which can predict the reason of packet loss by providing TCP with helpful route and movement information, and choose appropriate congestion control strategy under various conditions. Simulation results show that the improved VC-TCP performs better in Vehicular Communication Network since the throughput is increased and the latency is reduced.
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