Quality-adaptable over-the-top services

随着人们对高质量视频的需求不断增加，可用带宽不断增加，终端功能不断增强，如何及时为移动设备提供新服务，以尽可能快地利用新的商业机会，仍然是一个挑战。这反过来又导致了对over - top服务的更大兴趣，它不需要与接入网络的QoS机制集成的服务基础设施的可用性，因此更容易在各种网络技术上部署。

With greater demand on quality video, increased available bandwidth and ever-more capable terminals, the challenge remains to offer new services for mobile devices in a timely way, to capitalize as quickly as possible on new business opportunities. This, in turn has led to greater interest in Over-The-Top services, which do not require the availability of a service infrastructure integrated with the QoS mechanisms of the access networks and thus are deployed more easily, over a large variety of networking technologies. Nevertheless, such services must meet quality perception (or experience) objectives for users (QoP/QoE). These concerns extend beyond simple VVoIP services to other types of applications, more and more often collaborative, such as games. The challenge then is to create OTT services which can adapt the quality delivered to users to operational (e.g. network, usage) conditions. The practical issues are multiple. Essentially, unlike operator-controlled communications, there is a lack of control on the quality parameters of the communication channel. Hence, all forms of adaptation to establish and maintain quality must be performed by the application itself. There is a need to monitor and assess quality and manipulate application-level parameters and transport mechanisms to adapt to varying conditions. This research will focus on means to dynamically adapt media quality and communication robustness parameters to varying network conditions to optimize the quality perception of the users. We shall study - What circumstances to adapt to; - How to adapt to such circumstances, in terms of various terminal-related pa- rameters; - What is the comparative cost of different solutions, that is, to explore tradeoffs between alternatives at different protocol layers. This work will provide scientific guidance for Summit Tech Multimedia Communication's future projects.