Adaptive Methods for the Transmission of Video Streams in Wireless Networks Deliverable 2 . 2 Feedback Algorithms for the Increase of the Objective Quality

Nowadays the need for adaptive delivery of media streams over the Internet is of high importance because of the unpredictable nature of the heterogeneous environments. Compressed video streams exhibit large variations in their data rates something which makes their management in a packet-based best-effort network like IP extremely difficult. The problem is extenuated when we consider mobile users connecting with wireless terminals due to the erroneous and time variant conditions of the wireless links. Thus, applications of real-time video streaming in heterogeneous networks and computing environments like the Internet need to implement highly scalable and adaptive techniques in terms of content encoding and transmission rates. Taking all these into consideration it is apparent that designing adaptive mechanisms for Internet video transmission poses many challenges. Under these circumstances a combination of Content Adaptation Techniques and Network Adaptation Techniques is an imperative need. In this deliverable we propose two novel feedback algorithms for the increase of the objective quality of the transmitted video that involve the aforementioned adaptation techniques. We also propose two new algorithms for the control of the congestion in high speed networks. The performance of these algorithms will be evaluated through simulations in the next deliverable.