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

Abstract

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

CLC Number:

TP302

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

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

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