A Method of Admission Control Based on Both Resource Requests and Traffic Measurement and Its Dynamics Under On/Off Mode! Traffic

摘要

A method of admission control based on both resource requests by applications and class-based traffic measurement results was developed. In this method, a wide range of admission-control policy can be realized by adjusting three parameters, a, j3, and y. A policy-server prototype using this method and simulated voice traffic was used in traffic measurements. The measurements results show that the proposed method improves bandwidth usage and decreases call-blocking ratio while incurring low measurement load. Interesting but possibly harmful dynamics (i.e., system behavior) were observed by the simulations using traffic generated by an on/off model. That is, this admission-control method may cause oscillation or long-term evolution that lasts for 100 to 150 minutes, and it may also cause bandwidth "overshooting". The range of parameters with which such effects can be properly suppressed and the admission control correctly works was experimentally obtained.