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In this paper, we propose a quality-centric congestion control for multimediastreaming over IP networks, which we refer to as media-TCP. Unlike existingcongestion control schemes that adapt a user's sending rate merely to thenetwork condition, our solution adapts the sending rate to both the networkcondition and the application characteristics by explicitly considering thedistortion impacts, delay deadlines, and interdependencies of different videopacket classes. Hence, our media-aware solution is able to provide differentialservices for transmitting various packet classes and thereby, further improvesthe multimedia streaming quality. We model this problem using a Finite-HorizonMarkov Decision Process (FHMDP) and determine the optimal congestion controlpolicy that maximizes the long-term multimedia quality, while adhering to thehorizon- TCP-friendliness constraint, which ensures long-term fairness withexisting TCP applications. We show that the FHMDP problem can be decomposedinto multiple optimal stopping problems, which admit a low-complexitythreshold-based solution. Moreover, unlike existing congestion controlapproaches, which focus on maintaining throughput-based fairness among users,the proposed media-TCP aims to achieve quality-based fairness among multimediausers. We also derive sufficient conditions for multiple multimedia users toachieve quality-based fairness using media-TCP congestion control. Oursimulation results show that the proposed media-TCP achieves more than 3dBimprovement in terms of PSNR over the conventional TCP congestion controlapproaches, with the largest improvements observed for real-time streamingapplications requiring stringent playback delays.

Media-TCP: A Quality-Centric TCP-Friendly Congestion Control for Multimedia Transmission