Patent ID: 6137795
Filing Date: 2000-10-24
Classification: H04L

Abstract:
A cell switching method in a cell exchange system, comprising the steps of:providing a plurality of cell switches that operate at a basic switching rate;providing a plurality of queuing means that correspond to respective ones of the cell switches for queuing cells from an input transmission line;providing demultiplexing means and demultiplexing cells from the input transmission line and connecting said demultiplexing means to said queuing means for transmitting the demultiplexed cells to prescribed queuing means based upon header information of the cells;reading cells out of each of the queuing means at the basic switching rate and entering the cells into the corresponding cell switch; andproviding a multiplexer for multiplexing cells switched by each of the cell switches and sending the multiplexed cells to an output transmission line,further comprising the following steps in order to queue cells in said queuing means:allocating connection identifier to a call when the call is established and establishing correspondence between the call and said queuing means using the connection identifier allocated; andidentifying a call by referring to the connection identifier contained in header information of a cell, and storing, on a per-call basis, the last time a cell arrived at the exchange system;when a cell of a call has arrived, obtaining a cell arrival interval of the call based upon the difference between said last time and the present time;if the cell interval is greater than a set time period, obtaining a queuing means for which the connected number of cells is smallest and connecting the cell that has arrived to this queuing means; andif the cell interval is less than a set time period, connecting the cell to the queuing means that corresponds to the call.