Connection admission control for ATM networks
AssigneeNorthern Telecom Limited
InventorsSyed I. A. Shah, Kun Qian, Todd D. Morris
Life of this patent
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Abstract
In an ATM network, the physical resources are shared by many connection and the bandwidth is allocated virtually to each connection. The connection admission control (CAC) algorithm uses traffic descriptors, desired quality of service (QOS) parameters etc., to compute a required bandwidth for a requested connection by which it makes a decision to admit or reject the connection. Unlike any prior CAC, the CAC of the invention for constant bit rate (CBR) service takes also into consideration the cells delay variation (CDV) for calculating the required bandwidth.
Claims6
A connection admission control process for CBR connections in an ATM switching network, comprising steps of:
- receiving a CBR connection request specifying connection traffic descriptors, and a maximum allowed CDVT as a QOS parameter, where CDVT is a cell delay variation in seconds,
- receiving network state parameters,
- calculating a required bandwidth C for accepting the requested connection according to a predetermined equation using the maximum allowed CDVT, connection traffic descriptors and network state parameters, and
- determining to accept the connection request if C<A where A is an available network bandwidth.
Dependencies are inferred from the claim text.