Proceedings of the IFIP TC6 Task Group/WG6.4 International Workshop on Performance of Communication Systems: Modelling and Performance Evaluation of ATM Technology
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The issue of fairness has new prominence in multi-service networks where the diverse service characteristics can result in a very unfair resource allocation unless the issue is considered explicitly at the design stage. In this paper, we study the fairness issue of a Packet Routing Server (PRS) architecture based on the Dynamic synchronous Transfer Mode (DTM) access technology. DTM provides a dynamic bandwidth allocation scheme to support various types of telecommunications applications. However, this flexibility also promotes within DTM a lack of fairness concerning medium utilization as no enforcement scheme has been implemented in the DTM access technology. We demonstrate the unfairness of the DTM access scheme and provide resource reservation schemes to ensure that each type of traffic has its relatively fair share of the medium. Our results show that the dynamic resource reservation achieves a better medium utilization and a fair access of the resource in the DTM PRS.