Optimal call admission in circuit-switched networks

A fundamental issue arising in networks supporting voice traffic is that of call admission: the decision to accept or reject a new voice call. In this paper, we consider the optimal call admission problem in a circuit-switched tandem N-node network with fixed routing, i.e., all routes between source/destination (S/D) have been predetermined. Each S/D pair can be viewed as a circuit with the ith circuit. A call routed on circuit i is termed a type i call. We assume homogeneous bandwidth at each node, where the bandwidth is such that we can multiplex n voice calls on any circuit. In this paper we consider a state-dependent threshold based call admission policy. We propose an online´approach to determine the optimal threshold values so as to optimise the network performance