Design of an architecture and communication protocol for video transmission and videoconference

Resumen

This doctoral thesis faces the problem of video transmission, in television transmission systems and video on demand in real time, and video conferencing, in IP networks, making a special emphasis when the connection is established between mobile devices. In the first part of the work, video transmission in IP networks is introduced, and a special emphasis is made on videoconference, afterwards presenting the state of the art in both areas. We address several issues related to video compression, the quality of the video received, the Quality of Experience (QoE), systems for improving the QoE for videoconferencing and also technologies, such as Software Defined Networking (SDN), which allow us to dynamically improve the configuration of the network devices to improve the QoE perceived by the end users. Later, we come to describe the design of the architecture and protocol for the transmission of video in IP networks, with different objectives. We propose an architecture and a protocol to improve the QoE of the end users in the transmission of video in Internet Protocol Television (IPTV). We also do it for the transmission of video in Heterogeneous Networks using HTML5. Finally, we propose an algorithm and protocol to improve QoE of video transmission in networks used for environmental monitoring, fundamentated mainly on a study substantiated on coding based on the predominant color of the images of the video. In the next chapter, we propose a new architecture and a protocol for improving the End-to-End Quality of Experience (E2E QoE) of the users connected to a video conference. We define the process of the system, the finite state machine and the algorithm necessary for its correct operation. Finally, we present the different experimental tests that have been carried out to study and determine the best coding systems, and their behavior when using technologies such as SDN in networks of mobile devices, in Heterogeneous Networks using HTML5 and in videoconference.