A PRIORITY BUFFER CONTROL ALGORITHM IN ATM EXCHANGE SYSTEM

摘要

PURPOSE: A priority buffer control algorithm in an ATM exchange system is provided to satisfy QoS for superior service by buffering cells of highest priority in the event of overload, and to improve satisfaction about overall service by providing equal service opportunity for lower cells in the event of normal traffic. CONSTITUTION: A priority buffer control algorithm in an ATM exchange system includes the following steps. When a cell of FULL_OVLD state and L2_OVLD state(S1) is entered through a cell entrance point(S2), it is decided whether the cell is L2_OVLD state(S3). If not, the cell is stored in a primary buffer counter(PBC), it is decided whether the counter exceeds threshold L2(S5). If PBC exceeds L2, the cell is changed into L2_OVLD state(S6), or if not, the next cell is waited(S7). If the cell is entered in L2_OVLD state, it is decided whether the cell is an upper cell or lower cell(S8). If the cell is a lower cell, it is decided whether the cell is in FULL_OVLD state(S9). If the cell is in FULL_OVLD state, the entered lower cell is removed(S10). If not, the lower cell is stored in a subsidiary buffer(S11).