How to Improve the Virtual Scheduling Algorithm (VSA) in ATM Switching System

摘要

1. Technical field to which the invention described in the claims belongs;ATM switch;2. Technical Challenges to be Solved by the Invention;In order to calculate the tolerance of the computation speed and the tolerance by using the TRT obtained through repeated iterations in the VSA for the UPC function as a reference point of cell discarding and buffering, an accurate measurement of CDV (Cell Delay Variation) And thus the problem of causing the overall performance degradation is solved.;3. The point of the solution of the invention;(ST1) (ST2) comparing the maximum cell rate (PCR) negotiated between the user and the network and the average cell rate (ACR) of all the cells transmitted during the channel connection duration when the cell enters the inserting point of the exchange, Wow; (ST4) comparing the average cell rate (ACR) with the MSCR for ensuring a minimum interval between two consecutive cells when the maximum cell rate (PCR) is greater than the average cell rate (ACR); Wherein when the average cell rate (ACR) is larger than the MSCR, buffering is performed on the arrived cell, and when the average cell rate (ACR) is smaller than the MSCR, a value obtained by adding the error threshold (ET) Comparing the values (ST6); And buffering the arrived cell if the added value (ACR + ET) obtained in the step is greater than the MSCR, and discarding the arrived cell if the added value is smaller than the MSCR (ST3). It is.;4. Important Uses of the Invention;It applies to traffic control in ATM switch.