D-S Evidence Theory Based Quality Evaluation Mechanism for Network Services

摘要

QoS evaluation is a process of determining the attributes of the investigated object and quantifying the objective value or subject utility of these attributes. The current research on QoS evaluation is limited to specific domains or specific services. In the research, the QoS evaluation indexes for network services are given firstly. Then a multi-grades evaluation model based on D-S evidence theory to evaluate the running quality of network services is provided, which can achieve variable granularity evaluations 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. A fuzzy quality evaluation method for internet services is designed based on the D-S evidence theory. Examples show that the method can combine the subjective evaluation with objective evaluation and reduce subjectivity during evaluation process.