Importance of TFRC Congestion Control Mechanism in the Real Time Multimedia Applications

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Satish Kumar Sharma
Manish Mann

Abstract

This paper evaluates the suitability of TFRC congestion control mechanism and shows some current developments that make use of the protocol. Additionally, it should be looked at further developments of the protocol. TCP-Friendly Rate Control (TFRC) is a congestion control mechanism designed for uncast flows operating in an Internet environment and competing with TCP traffic [2]. TFRC is designed to be reasonably fair when competing for bandwidth with TCP flows, where a flow is ``reasonably fair'' if its sending rate is generally within a factor of two of the sending rate of a TCP flow under the same conditions. A problem with TFRC is that it uses additive increase to adjust the sending rate during periods with no congestion. This leads to short term congestion that can degrade the quality of voice applications. This paper highlights the additional bandwidth of congestion that are used in multimedia applications in the network.

 

Key words: - TFRC mechanism overview, TCP throughput equation, TFRC mechanism implementation, comparison of TFRC and TCP
TFRC Protocol Specification, TFRC throughput equation, TCP, comparison of TFRC and TCP.

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