无人机辅助智能交通系统中面向视频多播的资源优化  

Resource Optimization for Video Multicast in Unmanned Aerial Vehicle Assisted Intelligent Transportation System

作　　者：薛斌 张志才 付芳 XUE Bin;ZHANG Zhicai;FU Fang(School of Physics and Electronic Engineering,Shanxi University,Taiyuan 030006,China)

机构地区：[1]山西大学物理电子工程学院,山西太原030006

出　　处：《测试技术学报》2024年第2期194-202,共9页Journal of Test and Measurement Technology

基　　金：山西省基础研究计划自然科学研究面上资助项目(202103021224024);山西省基础研究计划青年科学研究资助项目(20210302123021);山西省重点研发计划资助项目(202202020101004)。

摘　　要：在智能交通系统(Intelligent Transportation System,ITS)中,实时交通视频可以辅助网联车做出更理智的决策。然而,由于车载传感器位置和数量的限制,车辆无法全面掌握交通环境,不利于行车安全;此外,当多个车辆用户请求相同的视频内容时,传统的单播传输模式存在效率低下的问题。为了解决这些问题,基于非正交多址接入(Non-Orthogonal Multiple Access,NOMA)和可伸缩视频编码(Scalable Video Coding,SVC)技术,提出了一种无人机(Unmanned Aerial Vehicle,UAV)辅助ITS的交通视频多播方案。通过联合优化车辆分组和功率分配策略,最大化车辆接收的长期视频质量。将该优化问题建模为一个马尔可夫决策过程(Markov Decision Process,MDP),并采用Soft Actor-Critic(SAC)算法来求解。大量仿真结果表明,该算法具有很强的探索能力,而且收益性能优于传统Actor-Critic(AC)算法。In Intelligent Transportation System(ITS),real-time traffic video can be used to assist Connected Autonomous Vehicles(CAVs)to make more sensible decisions.However,due to the limitation of locations and qualities of the onboard sensors,CAVs cannot observe the full traffic situations.In addition,when vehicle users subscribe to the same video content simultaneously,traditional unicast transmission mode is spectrum inefficient,especially for the traffic congestion scenario.In order to solve these problems,in this paper,we propose a traffic video multicasting scheme based on Non-Orthogonal Multiple Access(NOMA)and Scalable Video Coding(SVC)for Unmanned Aerial Vehicle(UAV)enabled ITS.We aim to maximize the long-term video quality received by vehicles by jointly optimizing the vehicle grouping and power allocation strategies.We model the problem as a Markov Decision Process(MDP)and leverage Soft Actor-Critic(SAC)algorithm to solve the MDP.Extensive simulation results indicate that the proposed algorithm has a strong exploration ability,and outperforms the traditional Actor-Critic(AC)algorithm in terms of the reward performance.

关 键 词：交通视频多播 可伸缩视频编码 非正交多址接入 Soft Actor-Critic 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]