China’s ZTE and Hong Kong cellco CSL have demonstrated a High Definition (HD) voice over LTE (VoLTE) call using enhanced Single Radio Voice Call Continuity (eSRVCC). The call involved HD VoLTE hand-off to 3G with a eSRVCC based pre-commercial network to achieve HD voice service continuity before and after hand-off. Christian Daigneault, CSL’s chief technology officer, said: ‘VoLTE provides an improvement in spectral efficiency and is needed to increase network capacity and allow to re-farm the 3G spectrum in the future. This HD VoLTE call using eSRVCC will shorten call set-up time, assure good handover to 3G where required and creates a better user experience for our customers.’
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