Multi-channel multicast/broadcast solution is used to improve Quality of Service (QoS) /Quality of Experience (QoE) of Video-on-Demand (VoD) service in mobile Internet Protocol Television (IPTV) applications. In this paper, a SNR-based multi-channel multicast scheme (SBMM) for popular video in wireless networks is proposed. Different from the existing fast data broadcasting scheme (FB), the wir...

We consider a network of periodically running railway lines. Investments are possible to increase the speed and to improve the synchronisation of trains. The model also includes random delays of trains and the propagation of delays across the network. We derive a cost-benefit analysis of investments, where the benefit is measured in reduced waiting time for passengers changing lines. We also es...

When waiting times cannot be observed directly, Little’s law can be applied to estimate the average waiting time by the average number in system divided by the average arrival rate, but that simple indirect estimator tends to be biased significantly when the arrival rates are timevarying and the service times are relatively long. Here it is shown that the bias in that indirect estimator can be ...