IMPROVEMENT OF MULTIMEDIA SERVICES QUALITY IN NEXT GENERATION NETWORKS USING FUZZY LOGIC METHODS

The paper presents a model for determining the degree of user satisfaction with quality of services, based on fuzzy inference on the basis of linguistic rules which are formulated based on user ratings. Proposed model is based on the fuzzy logic methods, because these methods allow evaluating user opinion most effectively. The model is a hierarchical structure that contains the main components of the service quality. For each of the components corresponding quality criteria are represented. On the basis of the proposed model user perception for music streaming and download service was estimated. Simulation was performed in MATLAB using the instruments of Fuzzy Logic Toolbox. The simulation enabled to answer the question which components of the quality of service and which quality criteria cause the maximum effect on the degree of user satisfaction with the service. Moreover, proposed model enables to get in advance an idea of the variation of the degree of satisfaction of a user of a service depending on changes in the level achieved by a particular quality criterion. The number of quality criteria that affect the final index can be easily changed if necessary. The proposed approach can be used to extrapolate and predict the degree of user satisfaction with quality of services on a limited statistical material.