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What is Congestion Control

Chapter 18

Handbook of Research on Mobile Multimedia, Second Edition

Controlling traffic entry into the network to avoid congestive collapse by attempting to avoid oversubscription of link by taking resource reducing steps, such as reducing the rate of sending packets.

Published in Chapter:

Adaptive Retransmission Scheme for Video Streaming Applications

Árpád Huszák (Budapest University of Technology and Economics, Hungary)

Source Title: Handbook of Research on Mobile Multimedia, Second Edition

DOI: 10.4018/978-1-60566-046-2.ch018

Abstract

In this chapter we present a novel selective retransmission scheme, based on congestion control algorithm. Our method is efficient in narrowband networks for multimedia applications, which demand higher bandwidth. Multimedia applications are becoming increasingly popular in IP networks, while in mobile networks the limited bandwidth and the higher error rate arise in spite of its popularity. These are restraining factors for mobile clients using multimedia applications such as video streaming. In some conditions the retransmission of lost and corrupted packets should increase the quality of the multimedia service, but these retransmissions should be enabled only if the network is not in congested state. Otherwise the retransmitted packet will intensify the congestion and it will have negative effect on the audio/video quality. Our proposed mechanism selectively retransmits the corrupted packets based on the actual video bit rate and the TCP-Friendly Rate Control (TFRC), which is integrated to the preferred DCCP transport protocol.