AN AGE PRIORITY PACKET DISCARDING SCHEME FOR ATM SWITCH BUFFER MANAGEMENT

In the current ATM AAL5 implementation, even a single cell loss event can lead to the corruption of one whole packet. Hence, it has been obs erved that the throughput of upper layer protocol may easily collapse on a congested ATM network. In this paper, we propose a buffer managem ent method called Age Priority Packet Discarding(APPD) scheme to be us ed along with two other schemes: the Early Packet Discarding (EPD) and the Partial Packet Discarding (PPD) schemes. After describing the ope rations and the pseudo code of the proposed APPD scheme and how it ope rates with the EPD/PPD schemes, the packet level QoS of APPD and its e xtended versions are derived analytically under homogeneous ON-OFF sou rce model. Numerical results obtained via analytical approach suggest that the proposed APPD scheme can more effectively and fairly reduce p acket loss probability than other schemes.