This article describes a non-intrusive QoS (quality of service) monitoring method for realtime telecommunication services. The key point of this method is that the invalid packet ratio and the invalid frame ratio are introduced to represent the factors affecting the speech and video qualities, respectively. Moreover, we can estimate multimodal quality by considering the individual qualities and their interaction. The results of subjective tests showed that the estimation accuracy of these factors was sufficient for practical use. This method enables us to manage QoS on call-by-call basis for interconnections among multiple network service providers including a variety of terminals and applications.
展开▼
