Admission control

Admission control, in the most primitive sense, is the simple practice of discriminating which traffic is admitted into a network in the first place [1]. Admission control can be thought of as controlling what type of traffic is allowed to enter or transit a network [2]. Admission control schemes therefore need to be implemented at the network edges to control the traffic entering the network [1].

An application that wishes to use the network to transport traffic must first request a connection, which involves informing the network about the characteristics of the traffic and the Quality of Service (QOS) required by the application. This information in stored in a traffic contract. The network judges whether it has enough resources available to accept the connection, and then either accepts or rejects the connection request. This is known as Admission Control. Admission Control in ATM networks is known as Connection Admission Control (CAC) [3].

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See Also

• Congestion Avoidance in Broadband Networks
• Teletraffic Engineering in Broadband Networks
• Call Admission Control
• Asynchronous Transfer Mode (ATM)

References

[1] Ferguson P., Huston G., Quality of Service: Delivering QoS on the Internet and in Corporate Networks, John Wiley & Sons, Inc., 1998. ISBN 0-471-24358-2.

[2] Hiroshi Saito, Teletraffic Technologies in ATM Networks, Artech House, 1993.

[3] Traffic Control in ATM networks, ATM Forum, http://cne.gmu.edu/modules/atm/ATMtra.html, Last Accessed 3 March 2005.