Continuidade da prestação do serviço de voz em redes de 4ª geração: voice over LTE

Abstract

The demand for high data transmission rates and the increasing number of connected devices mobile networks has boosted the development of a new generation of mobile data network, LTE (Long Term Evolution) standardized by the 3rd Generation Partnership Project (3GPP). Designed to provide only data and not support voice calls requires mobile operators to seek alternatives to not impact your revenue from voice service until a voice solution on the LTE network to be implemented in case the VoLTE using IMS (IP Multimedia Subsystem) architecture. In this context two alternatives are proposed, CSFB (Circuit Switch Fallback) that uses the legacy networks for carrying voice calls and Volga (Voice over LTE via Generic Access), which adopts the principle of using a data network generic for access to LTE networks and the transmission of voice calls. The main objective of this work is to identify and describe the main features of each network architecture proposed giving the advantages and disadvantages of each existing solution to the continued provision of voice services in LTE networks.