C-V2X下车载安全数据两阶段组播的中继选择与功耗分析

The demand for in-vehicle communication services has increased the power consumption of base stations (BSs) and reduced the reliability of their data transmission.This paper presents a relay selection strategy for two-stage multicast transmission of vehicle security data (TSMT-VSD) under cellular networks.In this strategy, the selected relay range is first determined on the premise of saving total power consumption, and then the optimal multicast radius x₀ with the lowest BS power consumption is calculated, followed by choosing the vehicle closest to the optimal multicast radius x₀ as the relay.Furthermore, based on the social attributes of relays, an asymmetric evolutionary game model between BS groups and relay groups is established, and a reward and punishment mechanism for dynamic redistribution of relay entertainment data transmission power without affecting secure data transmission is designed.The simulation results show that the proposed relay selection strategy and the designed reward and punishment mechanism can not only ensure the reliability of TSMT-VSD, but also save at least 25% power consumption of BS compared with the conventional one-stage multicast transmission, provided that the number of vehicles is beyond the bound K_min.