Research on the Variable Granularity Quality Evaluation Model and Arithmetic for Network Services

The current research on service quality evaluation is limited to specific domains or specific services.In the paper,to evaluate the running quality of network services,a variable granularity and fuzzy quality evaluation mechanism is proposed,which can achieve changeable granularity evaluation at different levels such as users,services and network systems.The mechanism integrates service management,policy management and network management together to provide QoS guaranteed services.The formal definition of evaluation metrics and the general evaluation flow are discussed.A fuzzy quality evaluation method for internet services is designed based on the D-S evidence theory and fuzzy evaluation concept.Examples show that the method can combine the subjective evaluation with objective evaluation and reduce subjectivity during evaluation process.