面向5G无线网络的高效编码缓存关键技术研究

The rapid growth of data traffic in wireless networks will result in severe congestion in future wireless networks. In recent years, a new caching technology called coded caching has been considered as an effective solution to the wireless network congestion problem. However, to design an efficient coded caching scheme for 5G networks, there exist many challenges, including heterogeneous caching deployment in 5G networks, heterogeneous network architecture of 5G networks, heterogeneous channel conditions of wireless links, and user mobility. In order to tackle the above challenges, rigorous research is carried out in this project to develop the key mechanisms and algorithms for efficient coded caching design in 5G networks. Firstly, a novel multi-source coded broadcast scheme is designed to address the heterogeneous channel condition problem, which is a critical problem for efficient coded caching design in wireless networks. It significantly improves the efficiency of broadcast transmission in coded caching. Secondly, code caching in 5G networks is studied with respect to different network hierarchies: backhaul networks, access networks, and integrated access and backhaul networks. More specifically, for each network hierarchy, novel mechanisms and algorithms are designed to achieve efficient coded caching. Finally, a simulation platform is developed to validate the coded caching mechanisms and algorithms designed in this project. The effectiveness, advantages, and performance gains of all the code caching schemes developed in this project will also be demonstrated by running typical networking scenarios on the simulation platform.

无线网络中数据流量的快速增长将导致未来网络的严重拥塞。近年来提出的编码缓存技术被视为一种解决无线网络拥塞问题的有效办法。然而，在5G无线网络中设计高效编码缓存技术还面临诸多挑战，如5G网络存在多种缓存布置场景和网络架构、不同无线链路具有异构信道条件、用户具有移动性等。为了解决上述挑战，本项目针对5G无线网络提出了一整套实现高效编码缓存的关键机制和算法。首先，在无线网络中利用编码缓存最重要的挑战是异构信道问题，为此，本项目设计了一套全新的多源广播编码传输机制，从而大大提高了编码缓存的广播传输效率；然后，针对5G无线网络的三种典型网络架构（回传网、接入网、和接入回传联合网），根据不同网络架构的特点，本项目分别设计了相应的编码缓存机制和算法，来提高不同架构下编码缓存的增益。最后，本项目设计的各项机制和算法将通过仿真平台来验证，并在仿真平台上运行典型的网络场景来展示研究成果。

近年来提出的编码缓存技术被视为一种解决无线网络拥塞问题的有效办法。然而，在5G无线网络中设计高效编码缓存技术 还面临诸多挑战，如5G网络存在多种缓存布置场景和网络架构、不同无线链路具有异构信道条件、用户具有移动性等。为此，本项目针对5G无线网络的回传网络和接入网络实现了一整套实现高效编码缓存的关键机制和算法。首先，针对在无线网络中利用编码缓存最重要的挑战是异构信道问题，本项目完成了一套全新的多源广播编码传输机制，从而大大提高了编码缓存的广播传输效率；然后，针对5G无线网络的回传网络和接入网络，根据不同网络架构的特点，本项目分别设计了相应的编码缓存机制和算法，来提高不同架构下编码缓存的增益。最后，本项目搭建仿真平台，完成的各项机制和算法都通过仿真平台得到验证，验证了机制与算法得性能增益。基于项目的研究，发表了多篇高影响力的国际期刊与会议论文，并申请了国家发明专利两项。还获得IEEE PIMRC 2021国际会议最佳论文奖一次。