Fig. 1. Conditional expected throughput performance in the v model. The left chart shows the call-average throughput of a tagged video call as a function of its duration τ and the number of video calls v found upon admission, and the right chart shows it as a function of the duration τ and the cac threshold v_max.

Fig. 2. Conditional expected throughput performance in the d model. The left chart shows the call-average throughput of a tagged data call as a function of its size x and the number of data calls d found upon admission, and the right chart shows it as a function of the size x and the cac threshold d_max.

Fig. 3. Comparison of different throughput measures in the sv, v and d models. The (insensitive) throughput measures in the left chart are identical for the sv and v models, given an appropriately normalised video traffic load. The right chart depicts, for the d model, the insensitive , and measures, along with the sensitive measure for three distinct data call size distributions.

Fig. 4. Comparison of different throughput measures in the sd model. All throughput measures are sensitive to the data call size distributions. The performance induced by three distinct distributions is shown.

Fig. 5. The impact of acceleration of the speech call arrival and departure process on in the sd model (left chart). The expected stretch performance for different data call size distributions (sd model), as well as the insensitive values for the d model.

Fig. 6. Comparison of the coefficient of variation associated with the different considered throughput measures in the v, sv, d and sd models. The cov of the instantaneous and time-centric throughput measures in the (s)v and d models are insensitive to the data call size distributions. For the cov measures that are not insensitive, the performance induced by three distinct distributions is shown. For those curves, the different applied shades indicate the assumed call size/duration distributions, as only explicitly presented in the legend for the call-average throughput.

Summary of the parameter settings assumed for the numerical experiments, based on the chosen context of a single cell in a gsm/gprs network