Throughput analysis of selective cell discard schemes in transport layer over ATM networks

In transport layer protocols over ATM networks, a packet is discarded when one or more cells are lost in that packet, and the destination node then requires its source to retransmit the corrupted packet. Therefore, once one of cells constituting a packet is lost, its subsequent cells of the corrupted packet waste network resources. In this paper, we propose the throughput analysis in transport layer with selective cell discard schemes and selective repeat ARQ. In the analysis, we suppose that sources steadily generate cells due to the packet retransmission; the resulting state will be referred to as source saturation, which makes the analysis very tractable from a computational point of view. Through some numerical results, we can clarify the impacts of the average number of packet length, the buffer size and the number of sources on the throughput performance of selective cell discard schemes.