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ABSTRACT
The DCCP (Datagram Congestion Control Protocol) is a new transport protocol designed for applications of the unicast type. Through the implementation of congestion control devices, allowing for the regulation of data emission debit and a device allowing for the acknowledgement of received data, it offers a unreliable, bi-directional, point-to-point and end-to-end transport service. The DCCP is particularly useful for applications presenting high time-constraints (time limit, jitter, debit), as in the case of multimedia fluxes searching for adaptation techniques for the debit conditions of the network. It has to be noted that the DCCP does not, in any way, manage the retransmission of the application data; similarly, there is no redundancy or error control mechanism (FEC).
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David ROS: Senior lecturer at Institut Télécom/Télécom Bretagne
INTRODUCTION
DCCP (Datagram Congestion Control Protocol) is a new transport protocol designed for unicast applications. It offers an unreliable, bidirectional, point-to-point, end-to-end transport service. DCCP implements congestion control mechanisms to regulate the rate of data transmission, and an acknowledgement mechanism for received data. DCCP has been introduced as an alternative to TCP and UDP, for time-critical applications requiring techniques to adapt throughput to network conditions. References in square brackets are explained in the section Learn more.
Like TCP and UDP, DCCP is located at Layer 4 of the Internet's protocol layer reference model (figure 1 ). Protocol Data Units (PDUs), known as packets, can contain either application data directly, or Real-time Transport Protocol (RTP) packets .
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New multimedia transport techniques: the DCCP protocol
Background and motivation
Bibliography
References
Websites
Internet Engineering Task Force (IETF) http://www.ietf.org/
All working group documents, as well as Internet Drafts, are available free of charge on the IETF website.
IETF working groups
http://www.ietf.org/html.charters/dccp-charter.html
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