QoX：What is It Really? 原作者：Rafal Stankiewicz,Piotr Cholda,and Andrej Jajszczyk,AGH University of Science and Technology 汇报人:马林 Introduction • What is QoX • QoX stands for: – QoS: Quality of Service – CoS: Classes of Service – GoS: Grade of Service – QoR: Quality of Resilience – QoE: Quality of Experience QoS • Three levels of QoS • Intrinsic QoS The ability of a network to provide the functions Related to communicaTion between users • Perceived QoS QoS requirements of the customer QoS offered by the provider QoS achieved by tne provider QoS perceived by the customer CoS • ITU-T six classes:1.Real-time,jitter sensitive , high interaction;2.Realtime,jitter sensitive,interactive;3.Transaction data , highly interactive;4.transaction data , interactive;5.Low loss only;6.Traditional applications of default IP network. • IEFT The requirement of each service class are described qualitatively as a tolerance to packet loss , delay and jitter. There is no strict values or bounds for the parameters per CoS. CoS • 3GPP Four classes:1.Conversational;2.streaming;3.Interactive;4.Background • IEEE: CoS GoS and QoR • GoS Applies to circuit switched networks and describes all phenomena occurring during connection setup , release and maintenance. Parameters : 1.connection set up delay;2.probability of end-to-end blocking;3.delay in authentication;4.probability of breaking an active connection. • QoR Network survivability against failures Parameters: the probability that a service is operational. QoE • Definition: The overall acceptability of an application or service , as perceived subjectively by the end-user • Factors influencing QoE QoE • QoE Evaluation Method Subjective testing Objective testing Network planning models(belong to Objective testing) The end! Thank you!