Multi-user session control in the next generation wireless system
Proceedings of the 4th ACM international workshop on Mobility management and wireless access
Mobility management for multi-user sessions in next generation wireless systems
Computer Communications
QoS mapping and adaptation control for multi-user sessions over heterogeneous wireless networks
Proceedings of the 3rd international conference on Mobile multimedia communications
Qos support for multi-user sessions in IP-based next generation networks
Mobile Networks and Applications
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This paper proposes a novel multilayer video transcoding approach for multicasting pre-encoded video to heterogeneous end-systems via diverse grouping of networks. Multilayer transcoding is first addressed by means of multiquality or SNR scalability of the MPEG-2 standard. Frequency domain transcoding and drift-compensated transcoding are derived from the closed-loop and multiloop SNR scalabilities, respectively. The proposed transcoding architectures are verified in terms of eliminating picture drift whilst preserving compatibility with the MPEG-2 SNR decoder. Multilayer transcoding is then addressed by means of multiresolution or spatial scalability of the MPEG-2 standard that supports different video formats. The transcoder retains the full resolution of the incoming video stream in its enhancement layer while generating a low spatio-temporal resolution base-layer compatible with the H.263 video format. Hence providing both multilayer transcoding and video format portability. The resultant video layers are shown to be free from drift with PSNR results comparable to those of the respective scalable encoders.