Abstract
LTE is a broadband wireless communication standard with the core network technology including voice service, which will be enhanced and evolved into 5G. In this article, we elaborate on performance issues of VoLTE and ViLTE. We investigate VoLTE voice quality with measurement experiments performed in the ITRI VoLTE testing environment. We also present the multimode and multiband interworking ViLTE call with a trial in a FET commercial mobile network. Our study provides references for the operators to measure the quality of VoLTE and ViLTE services.
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