中文摘要：

针对车辆自组织网络（vehicular Ad Hoc network，VANET）中紧急消息的传输，提出一个改进的二元分割广播（MBPAB）协议。协议将通信范围迭代划分成小的区域，寻找离发送节点最远区域内的车辆，对紧急消息执行转发，通过减少转发跳数，提高消息传播速度。通过引入MAC（medium access control）子层的微型分布式帧间间隔（mini-DIFS），赋予对紧急消息以更高的优先级接入通信信道。仿真结果表明，在VANET中，MBPAB协议与现有的广播协议相比，在通信时延和消息传播速度方面有更好的性能表现。

英文摘要：

A modified binary partition assisted broadcast （MBPAB） protocol was proposed, which was designed for emergency messages dissemination in vehicular Ad Hoc network （VANET）. The protocol divided the communication range into small sectors, and sought the farthest possible nodes in the farthest sector from the sender node to be the forwarding node to increase the dissemination speed by reducing the forwarding hops. A mini distributed inter-frame space （mini-DIFS） in a medium access control （MAC） sublayer was introduced to give the emergency messages a higher access priority to the communication channel compared with other messages. The results demonstrate that MBPAB protocol outperforms benchmarks of the existing broadcast protocols in VANET in terms of communication delay and the average message dissemination speed.