A Nonstationary Analysis of Bandwidth Access Control Schemes for Heterogeneous Traac in B-isdn

In this paper we present a comparative analysis of bandwidth access control schemes under nonstationary traac conditions for heterogeneous circuit-mode traf-c ooered to a B-ISDN network link. A uniied model to analyze the behavior of several bandwidth access control schemes is developed using a Markov process model with acceptance functions. Numerical method techniques are used to solve the associated Chapman-Kolmogorov equations and determine the nonstation-ary behavior. Performance results are given for several common bandwidth access control schemes, namely: complete sharing, complete partitioning, partial sharing , classical trunk reservation, and the probabilistic reservation policy. It is shown that the use of the average arrival rate to estimate the average connection blocking rate may be an underestimate for a system with a time varying arrival process. Also, it is found that a nonstationarity in one traac class arrival process can impact other stationary traac classes and the degree of variability depends on the particular access control scheme.