METHOD FOR IMPROVING VIRTUAL SCHEDULING ALGORITHM IN ATM SWITCHING SYSTEM

摘要

1. TECHNICAL FIELD OF THE INVENTION;ATM switchboard.;2. The technical problem to be solved by the invention;Accurate measurement of CDV (Cell Delay Variation) for all cells in order to calculate the problem and tolerance of the operation speed drop by using TRT obtained through multiple iterations in VSA for conventional UPC function as a reference point for cell discarding and buffering It is to solve the problem that the operation speed is reduced by causing the overall performance degradation.;3. Summary of Solution to Invention;When the cell enters the ingress point of the exchange, comparing the negotiated maximum cell rate (PCR) between the user and the network and the average cell rate (ACR), which is the ratio of all cells transmitted during the channel connection duration (ST1) (ST2). Wow; Comparing the average cell rate (ACR) with an MSCR for guaranteeing a minimum interval between two consecutive cells when the maximum cell rate (PCR) is greater than the average cell rate (ACR); When the average cell rate (ACR) is greater than the MSCR, buffer the arrived cell; when the average cell rate (ACR) is less than the MSCR, the value obtained by adding an error limit value (ET) to the average cell rate (ACR) and the MSCR Comparing the values (ST6); Buffering the arriving cell when the addition value (ACT + ET) obtained in the step is larger than the MSCR, and discarding the arriving cell when the addition value is smaller than the MSCR (ST5) (ST3). It is.;4. Important uses of the invention;It is applied to traffic control in ATM switch.