Most routers on the Internet employ a first-in-first-out (FIFO) scheduling rule to determine the order of serving data packets. This scheduling rule does not provide quality of service (QoS) with regards to the differentiation of services for data packets with different service priorities and the enhancement of routing performance. We develop a scheduling rule called Weighted Shortest Processing Time-Adjusted (WSPT-A), which is derived from WSPT (a scheduling rule for production planning in the manufacturing domain), to enhance router QoS. We implement a QoS router model based on WSPT-A and run simulations to measure and compare the routing performance of our model with that of router models based on the FIFO and WSPT scheduling rules. The simulation results show superior QoS performance when using the router model with WSPT-A. (c) 2004 Elsevier Ltd. All rights reserved.
- quality of service
- scheduling rules
- weighted shortest processing time and delay stability