LTE-V2X (also known as C-V2X or Cellular V2X) introduces direct or sidelink V2V (Vehicle to Vehicle) communications using the PC5 interface. LTE-V2X defines two modes (Mode 3 and Mode 4) for the management of radio resources. This study focuses on Mode 3 where the cellular network manages and allocates the radio resources for direct or sidelink V2V communications. Contrary to Mode 4, the 3GPP standards do not define any concrete scheduling scheme to allocate resources under Mode 3. In this context, this paper proposes a context-based scheduling scheme for LTE-V2X Mode 3 that exploits the geographical location of vehicles and dynamically configures its operation with the objective that all vehicles experience a similar level of interference when resources must be shared. The proposed scheduling scheme, referred to as DIRAC (aDaptive spatIal Reuse of rAdio resourCes), is validated analytically and its performance is evaluated through system level simulations. The evaluation shows that DIRAC outperforms existing LTE-V2X Mode 3 and Mode 4 scheduling schemes and ensures a more scalable and stable network operation as the channel load and congestion increases.

LTE-V2X（也称为C-V2X或蜂窝V2X）使用PC5接口引入了直接或侧链V2V（车对车）通信。LTE-V2X定义了两种用于管理无线电资源的模式（模式3和模式4）。这项研究关注模式3，其中蜂窝网络管理和分配用于直接或侧链V2V通信的无线电资源。与模式4相反，3GPP标准未定义在模式3下分配资源的任何具体调度方案。在这种情况下，本文针对LTE-V2X模式3提出了一种基于上下文的调度方案，该方案可有效利用车辆的地理位置配置其操作的目的是，当必须共享资源时，所有车辆都会受到类似程度的干扰。拟议的调度方案，被称为DIRAC（RADIO资源的自适应空间重用）经过分析验证，其性能通过系统级仿真进行评估。评估显示，DIRAC的性能优于现有的LTE-V2X模式3和模式4调度方案，并确保随着信道负载和拥塞的增加，网络操作更具可扩展性和稳定性。