Voice service in an LTE network-CSFB

Long Term Evolution technology supports only packet based services. All connections between mobile terminal and core network are end-to-end IP connections. Therefore voice call service as the most important circuit switch service will be replaced with Voice Over LTE technology. Although the final goal is clear, the transition path to Voice Over LTE technology is still subject of discussion and various solutions are planned or already implemented by various mobile operators. This paper is comparing different ways of current handling the voice traffic in LTE networks and provides the measurement results for one of the methods (Circuit Switch Fallback).