智能电视终端的视频服务质量保障

doi:10.3969/j.issn.1000-0801.2013.04.008

Abstract

Abstract:

With the development of internet business，intelligent terminals are becoming more and more popular.Faster CPU operating speed，more convenient operating system and flash and RAM with larger capacity than before are brought by terminal intelligence.Intelligent set-top box（STB）can support the IPTV service and OTT service at the same time.The method of estimating video quality experience，differences between IPTV and OTT service business realization mechanism in intelligent terminal was discussed.According to the difference between two types of video service，the method and requirement of quality assurance for video service was presented in the intelligent set-top box.

Key words: smart TV terminal, IPTV, OTT, quality guarantee, quality of experience

Liang Yao,Qing Xiao,Weijia Shi,Xi Xi. Video Service Quality Guarantee over Smart TV Termial[J]. Telecommunications Science, 2013, 29(4): 37-40.

对比项	IPTV视频业务	OTT视频业务
业务类型	直播、单播都可支持，快进、快退较为灵活	以单播为主，快进、快退实现较为复杂
承载网络	IPTV专网	互联网
编码方式	通常采用恒定码流编码（CBR）	通常采用动态码流编码（VBR）
视频传输形式	终端面向视频流（实时流媒体）	终端面向视频文件（渐进式下载）
视频承载协议	RTSP承载信令，RTP承载视频内容，通常采用UDP传输	HTTP承载信令和视频内容，通过TCP传输
视频传输特征	服务端按编码速率推送码流	客户端按网络带宽拉流
播放时延	较小缓存，立即启动播放	较大缓存，后启动播放
流量控制	不需要流量控制（实时流媒体）	需要流量控制（不控制会过载，造成网络资源的浪费）
网络适应能力	在网络带宽变化情况下，不支持码率自适应；UDP传输，对网络分组丢失敏感，对网络时延不敏感	在网络带宽变化情况下，支持码率自适应TCP传输，对网络分组丢失不敏感，对网络时延抖动敏感

对比项	IPTV视频业务	OTT视频业务
业务可靠性	点播成功率（点播成功次数/点播总次数）	点播成功率（点播成功次数/点播总次数）
业务完整性	异常中断率（异常中断次数/点播总次数）	异常中断率（异常中断次数/点播总次数）
业务请求时延	直播响应时延（IGMP请求报文发起到第一个UDP报文到达时间）；点播响应时延（RTSP请求报文发起到第一个UDP报文到达时间）	TCP 请求时延（TCP 连接时延）；HTTP 响应时延（发出HTTP请求消息后到开始显示页面的时间间隔）
视频清晰度	IPTV编码参数	OTT编码参数
视频损伤度	缓存清空次数；MDI：MLR 分组丢失因子超过阈值次数；MDI：DF 网络抖动因子超过阈值次数	停顿/缓存清空次数；停顿时间占比（缓存停顿时间/总播放时间），排除片头；网络指标，如下载峰值速率、下载平均速率、TCP重传率、TCP低窗口率等；HLS指标，如文件分片播放时长、分片下载时长、分片下载时间间隔等

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Video Service Quality Guarantee over Smart TV Termial

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1	ITU-T P.10/G.100.Vocabulary for Performance and Quality of Service， 2006
2	德科仕通信（上海）有限公司. OTT 视频业务质量质量保障技术白皮书， 2012