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Context-Aware Adaptive Multimedia Applications


Context Aware Adaptive applications are those who are able to modify and adapt their operation to their environment. In particular, adaptive multimedia applications are a subset of those applications, which are able to adapt their internal components (e.g. audio and video codecs, rates, etc.) to maximize the user's satisfaction in terms of perceived quality. To make that decission they use information from their environment called context.


These applications are particularly interesting for mobile and wireless scenarios in which channel capacity is usually variable and the resources and capabilities of the devices are heterogenous.

Proposed research activities

In particular, our research addresses among others the following issues:

• Adaptive multimedia components (audio and video codecs, etc.)

• Modeling of perceptual quality of service

• Adaptive multimedia streaming and videoconferencing

• Multimedia control protocols (session transfer, service discovery, etc.)

• Profiling, personalization and context management.

Related research projects

• DAIDALOS. Within the workpackage 3 of this project, we are contributing to the provision of adaptive mutimedia services by the development of user models based on the perceptual quality and the use of machine learning algoritm to drive the adaptation process.

• SAMURAI. We are developing adaptive multimedia and multiparty applications over the UMTS network. Experiments in real network conditions will be performed thanks to the support from Telefónica Móviles.

• CROWN. Within this project we developed real-time adaptive videoconferencing services for mobile environments. Initial experiments demonstrated the validity of this approach.

• CROWN-II. This was a follow-up project of CROWN, in which we evolved previous results towards a fully-operaty user-aware adaptive multimedia service. Within this second project, we added a new module allowing for the adaptation of the application's settings based on the estimation of the QoS perceived by the users. Experiments were performed in UMTS testbeds thanks to Ericsson España S.A.

• MIMICS-III. Within this project, we implemented a multimedia session-transfer mechanism based on SIP to transfer (and adapt) multimedia session to different devices. In our case, the transfer was between a PDA and a car's onboard computer.

[19-09-2007] Updated list of Master's Thesis (Lista Actualizada de Proyectos Fin de Carrera).