Performance nalysis of Fe ck Controlled Data Packet Transmission over -Speed Networ
Yonghwan Kim, San-Qi Li · 1998
The research on guaranteeing Quality of Services has been to a large extent focusing on satisfy- ing cell-level performance such as cell loss rate, cell de- lay variation, etc. In the authors' previous work, we have used stochastic modeling techniques to evaluate the packet-level performance of two existing packet discard- ing schemes, packet tail discarding and early packet dis- carding, based on three packet-level performance mea- sures: packet success probability, goodput, and badput. The work focused on the performance evaluation of data packet transmission over ATM UBR service. With the introduction of ABR service, source regulation based on closed-loop control becomes increasingly important. In this work we attempt to analyze the performance of early packet discarding when the source transmission rates are governed by the feedback information from a congested ATM bottleneck node. Numerical study shows that the steady-state performance are largely affected by slow time scales of the feedback system. Nonetheless, th,e design of control threshold in early packet discarding is not signifi- cantly sensitive to the system time scales.