Analysis of traffic performance implies capturing the three-way relation between capacity, demand and performance. This relation is generally probabilistic expressing performance criteria like blocking probabilities or expected response times in terms of assumed statistical traffic characteristics. As well as being a requirement for cost effective sizing, a sound understanding of this relation is essential in designing network traffic controls and resource sharing schemes. In this talk we discuss the nature of the traffic performance relationship in multiservice wireless networks such as GPRS and UMTS...