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Abstract:

The Datagram Congestion Control Protocol (DCCP) is a multi-purpose transport protocol that does not preserve reliability of transmission. The DCCP was intended to convey large amounts of data, especially in the real-time - which makes it suitable for real-time multimedia applications. Consequently, the RTP/DCCP protocol stack can be used for data transmission (instead of the RTP/UDP protocol stack, typically used during the transmission of real-time multimedia), when the DCCP works in mode CCID 3 (TCP-Friendly Rate Control, TFRC).

However, the TFRC manifests strong equality towards competing TCP flows, which (in some situations) can lead to the degradation of the multimedia stream transmitted over the TFRC. In this paper we describe the light-weight congestion control mechanism, previously designed by the Authors for TFRC-based real-time multimedia communication. The mechanism is based on the TFRCs congestion control, in which the original TFRCs throughput equation was substituted with a linear through-put equation. The mechanism that was introduced for the DCCP implementation and the results of experiments carried out in a mixed (real and emulated) network show that this type of congestion control is more suitable for multimedia than the DCCP working in the standard CCID 3 mode.

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Light-Weight Congestion Control for the DCCP Protocol for Real-Time Multimedia Communication