Networks performance based connection admission control model in ATM networks: immediate and future reservation approaches

Connection admission control (CAC) is defined as the set of actions taken by the network during the call set-up in order to determine whether a virtual channel/virtual path connection request can be accepted or should be rejected (or whether a request for re-allocation can be accommodated). Connection admission control for ATM networks should be based on information that is available locally, or that can be gathered easily from neighbours. We propose a method for implementing CAC for ATM networks, which is based on a distributed dynamic routing procedure, and which uses the network performance parameters that have been gathered at different nodes of the network. These network performance parameters define what different nodes are capable of offering to the connections. The method will find a "best" route, if it exists, that is able to meet the quality of service (QoS) constraints imposed by the user. To increase the acceptance calls, a future reservation model is added to the CAC procedure, which will rather than reject a connection, will specify a future time where enough available resources will be available and thus the connection will be accepted.