On some QoS aspects of user profile in universal multimedia access

A UMA system adapts rich multimedia contents to provide a user with the best possible presentation under the constraints of various terminals and network connections. However, the quality of adapted contents may vary widely with respect to the points-of-view of different providers and different users. So, a user should have some control on the adaptation process. We present two user's description tools, the presentation priority preference and the modality conversion preference, which allow a user to have flexible choices on the quality and modality of output contents. We also propose a systematic approach to integrate these user preferences into the adaptation process. These description tools are developed in the process of MPEG-21 standardization.