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A study of self-adjusting quality of service control schemes

We report simulation methods and results for analyzing a self-adjusting quality of service (QoS) control scheme for multimedia/telecommunication systems based on resource reservation. We study the case in which high priority clients' QoS requirement is not changed throughout the service period, while low priority clients' QoS may be adjusted by the system between the maximum and minimum QoS levels specified in order to adapt to the load of the system. The goal of the system design is to optimize the system reward as a result of servicing clients with different QoS and reward/penalty requirements. A QoS manager in these systems can do a table lookup operation using the simulation result reported to optimize the system total reward dynamically in response to changing workloads during the run time. The simulation result is particularly applicable to multimedia and telecommunication systems in which dynamic QoS negotiation/renegotiation is used as a mechanism to optimize the overall system performance.