Cellular vehicle-to-everything- (C-V2X-) based communications can support various content-oriented applications and have gained significant progress in recent years. However, the limited backhaul bandwidth and dynamic topology make it difficult to obtain the multimedia service with high-reliability and low-latency communication in C-V2X networks, which may degrade the quality of experience (QoE). In this paper, we propose a novel cluster-based cooperative cache deployment and coded delivery strategy for C-V2X networks to improve the cache hit ratio and response time, reduce the request-response delay, and improve the bandwidth efficiency. To begin with, we design an effective vehicle cluster method. Based on the constructed cluster, we propose a two-level cooperative cache deployment approach to cache the frequently requested files on the edge nodes, LTE evolved NodeB (eNodeB) and cluster head (CH), to maximize the overall cache hit ratio. Furthermore, we propose an effective coded delivery strategy to minimize the network load and the ratio of redundant files. Simulation results demonstrate that our proposed method can effectively reduce the average response delay and network load and improve both the hit ratio and the ratio of redundant files.

中文翻译：

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C-V2X网络中基于集群的协作式缓存部署和编码交付策略

基于蜂窝车辆到万物（C-V2X）的通信可以支持各种面向内容的应用程序，并且近年来获得了长足的进步。但是，有限的回程带宽和动态拓扑结构使得在C-V2X网络中难以获得具有高可靠性和低延迟通信的多媒体服务，这可能会降低体验质量（QoE）。在本文中，我们提出了一种新颖的基于群集的C-V2X网络协同缓存部署和编码交付策略，以提高缓存命中率和响应时间，减少请求响应延迟，并提高带宽效率。首先，我们设计一种有效的车辆群集方法。基于构建的集群，我们提出了一种两级协作式缓存部署方法，以将频繁请求的文件缓存在边缘节点，LTE演进型NodeB（eNodeB）和群集头（CH）上，以最大化整体缓存命中率。此外，我们提出了一种有效的编码传递策略，以最大程度地减少网络负载和冗余文件的比例。仿真结果表明，本文提出的方法可以有效地减少平均响应延迟和网络负载，提高命中率和冗余文件率。