为了实现多接口车载自组织网络(VANET)车辆节点合理高效的信道接入,提出了一种基于车辆节点多接口状态字的时分竞争信道接入算法。根据车辆节点的多接口状态字给出了时隙划分的方法与竞争退避机制原则,通过综合考虑竞争类技术与时分多址技术的优点,有效解决了信道公平接入的问题。通过软件仿真比较可以看出,该算法实现了信道的合理接入,减小了平均端到端时延,增加了网络平均吞吐量,显著提高了多接口VANET的网络性能。 In order to achieve a reasonable and efficient channel access for VANET vehicle nodes, a time-competing channel access algorithm based on vehicle node multi-interface status words is proposed. According to the multi-interface status word of the vehicle node, the method of time slot division and the principle of competition backoff mechanism are given. The fair access problem of channel is effectively solved by considering the advantages of competitive class technology and time division multiple access technology. Through software simulation comparison, we can see that the algorithm achieves reasonable channel access, reduces the average end-to-end delay, increases the average throughput of the network, and significantly improves the network performance of the multi-interface VANET.