基于TWDM-PON与C-RAN的QoE感知视频协作缓存与传输机制  

QoE-aware video cooperative caching and transmission mechanism based on TWDM-PON and C-RAN

作　　者：吴大鹏[1,2] 李雪 李红霞 WU Dapeng;LI Xue;LI Hongxia(School of Telecommunication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Key Laboratory of Optical Communication and Network,Chongqing 400065,China;Chongqing Branch of China Unicom,Chongqing 401123,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065 [2]重庆市光通信与网络重点实验室,重庆400065 [3]中国联合网络通信有限公司重庆市分公司,重庆401123

出　　处：《通信学报》2019年第3期80-91,共12页Journal on Communications

基　　金：国家自然科学基金资助项目(No.61771082;No.61871062);重庆市高校创新团队建设计划基金资助项目(No.CXTDX201601020)~~

摘　　要：随着数据流量的爆发式增长,用户体验质量急剧恶化,为了解决密集组网与负载不均衡所引发的小区边缘用户与重负载小区用户性能较差的问题,提出了一种体验质量感知的云无线接入网视频协作缓存与传输机制。该机制通过建立协作增益感知的虚拟无源光网络,采用光域和无线域协同的方式为视频内容提供协作缓存与传输;进而,联合优化用户视频体验、带宽配置与缓存策略,分别在光域和无线域采用动态预缓存及缓冲水平感知的带宽配置方式,达到提高用户体验质量的目的。结果表明,所提机制能够有效地提高缓存命中率,增强用户体验质量。The quality of user experience suffers from performance deterioration dramatically due to the explosively growing data traffic.To improve the poor performance of cell-edge users and heavy-load cell users,which caused by dense network and load imbalance respectively,an QoE-aware video cooperative caching and transmission mechanism in cloud radio access network was proposed.Cooperative gain-aware virtual passive optical network was established to provide cooperative caching and transmission for video streaming by adopting collaborative approach in optical domain and wireless domain.Furthermore,user experience for video streaming,bandwidth provisioning and caching strategy were jointly optimized to improve QoE,which utilized the methods of dynamic caching in optical domain and buffer level-aware bandwidth configuration in wireless domain.The results show that the proposed mechanism enhances the quality of user experience and effectively improves the cache hit rate.

关 键 词：云无线接入网 虚拟无源光网络 协作缓存与传输 体验质量 

分 类 号：TP302[自动化与计算机技术—计算机系统结构]