Abstract
In the provisioning of broadband Internet Protocol TV (IPTV) services, call blocking probability (CBP) denotes the ratio of failed user requests, which is one of the most important metrics on IPTV quality of experience (QoE). This paper aims to evaluate and further to decrease the end-to-end (E2E) CBP of IPTV services in both stationary and peak-hour scenarios. At first, we analyze a currently typical xDSL based IPTV delivery network architecture and its simplification. Then, a recently developed IPTV user behavior model is briefly presented. Next, a state-vector-based simulation model is proposed to evaluate the E2E CBP in an entire IPTV delivery network with tree topology. The simulation model is then applied to both stationary and peak-hour scenarios, and thereafter, a comparative simulation study demonstrates significant differences between the E2E CBPs evaluated in the two different scenarios. After that, we elaborate an extended TV channel admission control (TCAC) scheme to be applied in an entire IPTV delivery network. Simulation experiments illustrate the potential of our TCAC scheme to enhance the IPTV QoE by relatively decreasing the E2E CBP significantly (up to 25%), in both stationary and peak-hour scenarios.
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