时移IPTV系统的设计和服务质量评估

Providing Quality Affordable Time-shifting Services in Live IPTV Systems

提出了一个IPTV解决方案,以解决如下典型环境的时移服务问题:基于专用的IPTV网络,播放终端性能有限,存在大量用户进行高互动性操作。同时又创造性地提出了时移IPTV系统服务质量评估体系,并以此为依据对时移IPTV系统进行设计和评估。该解决方案已经在上海投入试运营,商用部署的测试数据表明系统在大并发条件下能够提供高质量的时移服务。

Time-shifting is expected to be a popular core feature of IPTV systems because of its ability to enable users to personalize their TV channels. Here we propose a quality affordable IPTV time-shifting solution to what is often the most demanding situations： the combination of the limited power of end-user equipments and highly interactive users on a dedicated close network. Extensive empirical evaluations based on first-hand accounts of deployment experiences as well as theoretical analysis are given. Evaluation results show that the system offers good quality of time-shifting service in high- concurrency environment.