Qualcomm Technologies has announced its first commercial VoLTE launch in Japan, with mobile operator NTT Docomo, reported Telecompaper.com on July 9, 2014. The VoLTE service is based on the Qualcomm Snapdragon 800 processor with a multimode integrated VoLTE modem and IMS software that supports SMS, HD voice, video telephony and single radio voice call continuity (SRVCC), to be found on smartphones available on NTT Docomo’s network. The VoLTE service is designed to provide mobile users with services across LTE and 3G networks with SRVCC. The VoLTE service is also designed to deliver voice calls, voice connections and simultaneous voice and Cat4 data rates up to 150 Mbps over LTE.

The Snapdragon 800 processor supports VoLTE features such as CDRX, RoHC, SPS, and TTI Bundling. The Qualcomm modem centric IMS product is designed to adapt to radio conditions for mobility performance, lower power consumption and optimized call latency for HD voice, voice and video telephony services.

The VoLTE service has been performance optimized for diverse radio conditions and its Single Radio Voice Call Continuity (SRVCC) is designed to support handover from LTE to 3G without dropping voice calls. It also incorporates robust inter-technology working with 2G, 3G and WLAN, which has been tested across infrastructure vendors and operator networks.