可感知车辆移动的车联网路边单元内容编码缓存方法
Mobility⁃aware coded caching for roadside units in vehicular networks
  
DOI:
中文关键词:  车联网;路边单元;内容缓存;移动感知;网络编码
英文关键词:Internet of vehicles; road side unit; content caching; mobility-aware; network coding
基金项目:国防基础科研计划(JCKY2023***007)、国家自然科学基金(62471241)、江苏省现代教育技术研究项目(2023-R-107296)、江苏省研究生实践创新计划(SJCX24_0335,SJCX23_0291)和南京邮电大学自然科学基金(NY221095,NY223106)资助项目
作者单位
殷俊 南京邮电大学 物联网学院,江苏 南京 210003 
陈烨 南京邮电大学 物联网学院,江苏 南京 210003 
孙杰 南京邮电大学 物联网学院,江苏 南京 210003 
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中文摘要:
      针对车联网路边单元(Road Side Unit, RSU)存储空间有限,且现有缓存策略未充分考虑车辆 动态移动导致的服务环境切换时数据传输延迟或丢包风险增加的问题,提出一种可感知车辆移动 的RSU内容编码缓存方法。通过建立可感知车辆移动的RSU内容部署模型,形成将车辆用户请求 的服务内容预先缓存到 RSU的优化部署方案,并在对缓存内容进行按需编码后部署到 RSU,使车 辆用户可以直接从RSU获取内容,降低了对云服务器的依赖。设计了基于蒙特卡洛模拟实验的仿 真测试系统,实验结果表明,相较于移动感知概率缓存方法,文中方法命中概率提高 13%,在服务 延迟、命中吞吐量等方面表现更优,有效提升了车联网缓存性能。
英文摘要:
      Since the storage space of road side units (RSU) in the Internet of vehicles is limited, and the existing caching strategies fail to fully consider the increased risk of data transmission delay or packet loss during service environment handovers caused by dynamic vehicle movement, this paper proposes a mobility-aware RSU content coding caching method. A mobility-aware RSU content deployment model is established, which generates an optimized deployment scheme to pre-cache the service content requested by vehicle users into RSUs. The content to be cached is then encoded on demand and deployed to RSUs, allowing vehicle users to directly retrieve content from RSUs and thereby reducing dependence on cloud servers. A simulation test system based on Monte Carlo simulation experiments is designed. The experimental results show that compared with the mobility-aware probabilistic(MAP) caching method, the proposed method increases the hit probability by 13%, and performs better in terms of service delay and hit throughput, effectively improving the caching performance of the Internet of vehicles.
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