USAGE PARAMETER CONTROL IN ATM NETWORKS BY SOLVING CDV PROBLEM AT UNI

Due to the Cell Delay Variation (CDV) at User Network Interface (UNI), it is very hard for an ATM network to perform Usage Parameter Control (UPC), which is an important job for congestion control. Based on the Generic Cell Rate Algorithm (GCRA), ATM Forum has proposed a procedur e to perform the UPC. However, the severe problem is that a user has t o specify the CDV Tolerance at the UNI by itself. Such a nearly unreac hable constraint makes the GCRA unsuitable for UPC. In this paper, we point out that the CDV comprises two parts in which the customer and a network provider should be responsible. Thus, we proposed a concept o f Innocent Public Network and Agent Protocol to realize the principle and facilitate UPC. In addition, a shaper is suggested for the custome r to employ so as to prevent its performance degradation. In the propo sed system the network is no longer suffered from CDV at the UNI and t he UPC can be easily performed.