计算机工程

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基于LTE-V2X的车联网资源分配算法

  

  • 发布日期:2020-02-28

  • Published:2020-02-28

摘要: LTE-V2X作为车联网的关键技术,目的是提高道路安全。在LTE-V2X环境下,资源分配有集中式(Mode 3)和分布式(Mode 4)两种方式。针对Mode 4方式下的Sensing-based Semi-Persistent Scheduling(SPS)资源分配算法面对着几个问题,如半双工错误、隐藏终端错误和资源块冲突。本文针对高速公路场景,提出了一种基于行车方向的SPS算法。首先根据高速道路的行车方向的特点,将资源池进行划分两个资源子池,其目的在于减少反方向车辆用户(Vehicle User Equipment,VUE)之间的潜在干扰,在此基础上,让每个资源块携带位臵信息,以降低SPS算法中资源重选时碰撞的概率。通过在高速场景中的仿真来验证所提方案的性能,其结果与现有方法相比可以有效的提高分组接收率(Packet Reception Ratio, PRR)。

Abstract: LTE-V2X as a key technology for car networking aims to improve road safety. In the LTE-V2X environment, there are two ways of resource allocation: centralized (Mode3) and distributed (Mode4).The Sense-based Semi-Persistent Schedule (SPS) resource allocation algorithm for Mode4 mode faces several problems, such as half-duplex errors, hidden terminal errors, and resource block conflicts. This paper proposes a SPS algorithm based on driving direction for highway scenarios. First, according to the characteristics of the driving direction of the high-speed road, the resource pool is divided into two resource sub-pools, the purpose of which is to reduce the potential interference between the opposite VUE (vehicle use balance). Based on this, each resource block is allowed to carry location information to reduce the probability of collision when resources are reselected in SPS algorithm. the performance of the proposed scheme is verified by the simulation in high-speed scenarios, and the results can effectively improve the packet reception ratio (PRR) compared with the existing methods.