QoE-driven dynamic management proposals for 3G VoIP services


Abstract__Most of the currently available adaptation solutions of VoIP
over UMTS are based on the modification of service parameters as the
only available reaction against any detected service degradation. On the contrary,

in this paper we propose a combined approach where service-level
adaptation is considered first and, provided that no suitable parameter
combination is capable of providing enough QoE, a change of network state
will be suggested. In order to do so we analyze the performance of the
end-to-end (e2e) performance metrics in this convergent scenario, the root
causes of possible degradations and, finally, the combined effects of the
different network segments and their impact on the user perceived QoE.
We show the map of best performing VoIP configurations for every state
of the network segments. Furthermore, considering each of these configurations,
we analyze the acceptability of the service or the convenience of trying to modify
the network state. Finally, a lightweight implementation based on simple network
state estimation and decision heuristics is proposed and validated in terms
of accuracy and responsiveness.