Network providers do not guarantee a certain quality of service, but merely promise to do their best. That may not matter for personal e-mails, but it does for time-sensitive data such as video.
网络提供者们不担保某种程度的服务质量，仅承诺将尽力而为，这可能对个人电邮不算什么，但是对时间敏感的数据比如视频就很重要了。
Data delivery can be easily interrupted by departure of end hosts in P2P live streaming network, which may lead to degradation of QoS in time-sensitive applications.
在P 2 P视频直播网络中，用户频繁地加入或离开组播组会造成数据传输中断。
At the same time, the multimedia services which are sensitive to delay and delay jitter enrich the network resources, but also put forward the question of how to assure its quality in network.
同时，对时延及时延抖动比较敏感的多媒体业务的不断出现，在极大的丰富了网络资源的同时也引入了在现有网络中如何保证其传输品质的问题。
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