基于复合中继的车载自组织网络数据传输算法

A data dissemination algorithm based on composite relay in VANET

在车载自组织网络中,传输安全类相关的数据时,要求满足低时延和高可靠性,针对高速公路场景中危险警告消息数据的传输,提出一种基于邻居信息的多候选复合中继安全数据传输算法。车辆节点之间通过相互交换Hello Message构建2跳邻居表,在选择下一跳转发节点时利用2跳邻居节点信息得到一个复合参数,该复合参数综合考虑了车辆速度、位置和行驶方向3个因素。根据得到的复合参数值确定转发优先顺序,最高优先级车辆节点被确定为最佳中继转发节点,次优先级车辆节点作为备选中继转发节点。在最佳转发节点发送消息失败时,由备选转发节点继续完成消息转发任务,从而提高数据传输成功率。理论分析和仿真结果表明,提出的算法在实时性和可靠性方面有明显提升。

Data dissemination in VANET,especially the dissemination of safety related data,requires low delay and high reliability. Based on two-hop neighbor information,this paper proposes a Multiple candidate Relay Data Dissemination algorithm（ MRDD） to transmit emergency message in highway scenarios. The two-hop neighbor information table is constructed by exchanging Hello Messages. The composite criterion is gotten from the neighbor information table,which considering both the velocity and location of the vehicle. According to the value of composite criterion,the highest priority vehicle node is chosen as the optimal relay node. When the optimal relay node fails,the candidate vehicle will rebroadcast the data.Theoretical analysis and simulation results show that the proposed algorithm can achieve lower packet transmission delay and higher reliability.