关键词: 车联网, 安全应用消息, 异构网络, 网络选择

Abstract: In order to realize the low latency and high reliability transmission of safety application messages, this paper designs a network selection algorithm based on DSRC/LTE for the transmission of safety application message. From the quality of service (QoS) demand of safety application messages, the designed algorithm considers various parameters such as end-to-end delay, packet loss rate and transmission speed. The algorithm firstly uses the analytic hierarchy process (AHP) to compute the weight of each parameter in the safety application message transmission QoS, then analyzes the ability to support the safety application message transmission QoS of each candidate network, finally calculates the satisfaction of the safety application message transmission QoS. The simulation of the designed algorithm is implemented on the platform VeinsLTE, in which the relationship of traffic simulation and network simulation is bidirectional coupling and they can interact in real-time, and the performance is verified on it too. The simulation results show that the designed algorithm can allocate the network resource reasonably according to the different QoS needs of safety application messages. On one hand, compared with the QoS-oriented TDMA protocol, when using the QoS-oriented TDMA protocol and the designed algorithm simultaneously, in the high speed scenario and the urban scenario respectively, the reception probability of the safety application message has improved by 13.7% and 10.4%, and the transmission delay of the safety application message has reduced by 8.6% and 11.5%. On the other hand, compared with the matching game network selection algorithm in the high speed scenario and the urban scenario respectively, the reception probability of the safety application message in the designed algorithm has improved by 11.6% and 7.5%, and the transmission delay of the safety application message in the designed algorithm has reduced by 13.2% and 15.3%.

Key words:  Internet of vehicles (IoV), safety application message, heterogeneous network, network selection