基于TWDM-PON与C-RAN的QoE感知视频协作缓存与传输机制

doi:10.11959/j.issn.1000-436x.2019066

通信学报 ›› 2019, Vol. 40 ›› Issue (3): 80-91.doi: 10.11959/j.issn.1000-436x.2019066

基于TWDM-PON与C-RAN的QoE感知视频协作缓存与传输机制

吴大鹏^1,²,李雪^1,²,李红霞³

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

修回日期:2018-09-20 出版日期:2019-03-01 发布日期:2019-04-04
作者简介:吴大鹏（1979- ），男，黑龙江大庆人，博士，重庆邮电大学教授、博士生导师，主要研究方向为泛在网络、互联网服务质量控制等。|李雪（1993- ），女，重庆人，重庆邮电大学硕士生，主要研究方向为光无线融合网络。|李红霞（1969- ），女，重庆人，中国联合网络通信有限公司重庆市分公司高级工程师，主要研究方向为光无线融合网络。
基金资助:
国家自然科学基金资助项目(61771082);国家自然科学基金资助项目(61871062);重庆市高校创新团队建设计划基金资助项目(CXTDX201601020)

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

Dapeng WU^1,²,Xue LI^1,²,Hongxia LI³

¹ School of Telecommunication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China
² Key Laboratory of Optical Communication and Network,Chongqing 400065,China
³ Chongqing Branch of China Unicom,Chongqing 401123,China

Revised:2018-09-20 Online:2019-03-01 Published:2019-04-04
Supported by:
The National Natural Science Foundation of China(61771082);The National Natural Science Foundation of China(61871062);Chongqing Funded Project of Chongqing University Innovation Team Construction(CXTDX201601020)

摘要/Abstract

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。

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

Abstract:

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.

Key words: cloud radio access network, virtual passive optical network, cooperative caching and transmission, quality of experience

中图分类号:

TP302

吴大鹏,李雪,李红霞. 基于TWDM-PON与C-RAN的QoE感知视频协作缓存与传输机制[J]. 通信学报, 2019, 40(3): 80-91.

Dapeng WU,Xue LI,Hongxia LI. QoE-aware video cooperative caching and transmission mechanism based on TWDM-PON and C-RAN[J]. Journal on Communications, 2019, 40(3): 80-91.

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参数设定	参数数值
RRH-ONU数量	20
RRH覆盖范围/m²	500 × 500
视频数目	10⁴
波长容量/(Gbit?s^-1)	10
平均无线接入时延/ms	50
平均前传时延与平均回传时延/ms	20，80
路径损耗/dB	L=128+37.6lgR
传输功率/dBm	20
RRH缓存容量/GB	100
系统带宽/MHz	20
视频分辨率版本	11

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

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