Qualcomm Claims First VoLTE-to-WCDMA Call Hand-Off
Qualcomm today announced that it and partner Ericsson have successfully completed the first voice call handover from an LTE mobile network (using voice over LTE — or VoLTE) to a WCDMA network. The call used Single Radio Voice Call Continuity (SRVCC), which is required for VoLTE calls to seamlessly switch to a WCDMA network when a consumer on a VoLTE call leaves the LTE network's coverage area. SRVCC and its predecessor CSFB (circuit-switched fall back) allow both LTE and 3G network connections to be supported on a single chip, which lets handset makers design smaller, less expensive, more power-efficient phones. The test was completed using an Ericsson handset with Qualcomm's Snapdragon S4 MSM8960 3G/LTE multimode processor.