Abstract
In the past few years, there has been a proliferation of LTE networks and devices supporting the technology that has enabled millions of users to get connected. Operators have been using their LTE networks to provide voice services in the form of voice over LTE (VoLTE). Given the increase in popularity of VoLTe services operators want to provide better performance for this service even when radio conditions are sub-optimal. In addition, users also expect great call experience, irrespective of LTE coverage quality. Traditional VoLTe calls - where the bit-rate (or mode set) is static and does not change based on the call quality - can deliver degraded user experience under bad link quality and RF conditions. This paper presents a practical framework designed by Qualcomm which allows the device or user equipment (UE) to assess the quality a user may be experiencing on an Enhanced Voice Services (EVS) codec based VoLTe call and changes the bit-rate adaptively to improve user experience. Initial laboratory and field test results are presented in this paper.
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