ZTE conducts HD VoLTE call for HK telecom operator CSL

Telecom Lead @ Mobile World Congress 2013: ZTE has conducted a high definition (HD) voice over LTE (VoLTE) call using Single Radio Voice Call Continuity (eSRVCC) for Hong Kong’s mobile operator CSL.

CSL conducted a HD VoLTE call hand-off to 3G with eSRVCC based pre-commercial network.

ZTE — which is showcasing its 4G solutions at MWC 2013 — says HD voice will keep service continuity before and after hand-off. This HD VoLTE call with end-to-end  QoS assurance provide highly reliable user experience and help operators differentiate their services from OTT competitors.

READ Mobile World Congress 2013 HERE

Adaptive Multi Rate Wideband (AMR-WB) speech codec was supported in the HD VoLTE call demonstration. This HD voice speech codec provides improved speech quality due to a wider speech bandwidth from 50 to 7,000Hz and ensures no significant impact on radio-frequency capacity due to the efficiency of codec suitable.

ZTE says HD voice technology will significantly promote the development of high quality voice service, such as speech recognition, speech-to-text and HD conferencing.

“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,” said Christian Daigneault, chief technology officer of CSL.

The 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. CSL has been the first to bring Dual Band LTE at 1800/2600 MHz in Asia and will continue to bring a superior network experience to its customers.

By the end of Q4 2012, ZTE IMS product has won 150 commercial / trial contracts worldwide.

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