Delay-bandwidth normalized service sharing with service rate guarantees

Fair queueing algorithms based on Generalized Processor Sharing (GPS) provide sessions with instantaneous fair sharing of server capacity, as well as guaranteed service rate and delay. The instantaneous fair sharing distributes server capacity to currently back-logged sessions in proportion to their weights regardless of the amount of service that the sessions received in the past. From a long-term perspective, however, this type of sharing leads to a different quality of service to sessions even if they have the same weight, since it provides only the instantaneous capacity sharing without considering the accumulated service delay and bandwidth. To minimize such long-term unfairness, we propose a delay and bandwidth normalized scheduling model in which the concept of Value of Service (VoS) is defined from the aspects of both delay and bandwidth. Performance comparisons between the proposed algorithm and traditional fair queueing algorithms show that the proposed algorithm provides better long-term fairness among sessions and is more adaptive to sessions with dynamic traffic patterns without compromising the guarantees of service rate and delay.