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QoS control by simple modified FIFO in ATM networks

Although earliest-deadline-first (EDF) is recognized as the optimal scheduling discipline to support the bounded-delay service in ATM networks, it lacks of the support of a prioritizing scheme for cell loss control. We modify the simple FIFO to implement a near-EDF scheduling discipline with loss control. The proposed scheme can guarantee the stringent delay bound and minimize the cell loss rate. The adaptive queue lengths in the proposed buffer structure can be determined dynamically according to the traffic load and cell delay constraints to minimize the cell loss rates. With the different deterministic adaptive queue lengths, the proposed scheme is equivalent to the other previous schemes. Performance evaluation shows that the proposed scheme's accessible offered load is better than the other schemes.