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February 6, 2012

Qualcomm completes voice call handover from LTE to WCDMA network

VoIP-over-LTE Call is enabled through Ericsson's network

By CBR Staff Writer

Qualcomm has completed the first voice call handover from an LTE mobile network to a WCDMA network using Single Radio Voice Call Continuity (SRVCC).

Being an important technology required for voice-over-LTE (VoLTE) support, SRVCC is a 3GPP specified feature that enables continuity of service by switching to a WCDMA network when a consumer on a VoLTE call leaves the LTE network’s coverage area.

The VoIP-over-LTE call is enabled through Ericsson’s network using a handset which incorporated Qualcomm’s Snapdragon S4 MSM8960 3G/LTE multimode processor.

SRVCC is the next logical step in the 4G LTE voice roadmap following the launch of circuit-switched fallback technology (CSFB) on smartphones in 2011.

CSFB allows a single radio in the handset to switch from an LTE data connection to a 3G connection when the user needs to make or receive a call, while with the support of SRVCC, a single radio in the handset can execute a handover of a voice call from an LTE network to a 3G network.

SRVCC and CSFB also allow both LTE and 3G network connections to be supported on a single chip, eliminating the need for smartphones to use separate LTE and 3G radios and modems.

Qualcomm Product Management senior vice-president Cristiano Amon said as LTE networks are deployed alongside 3G networks, the ability for multimode 3G/LTE mobile devices to connect to different network technologies will be an important part of providing the best possible mobile voice and data experience to consumers.

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"Qualcomm is committed to the successful deployment of LTE networks worldwide in conjunction with 3G networks, and the milestone we’ve achieved with Ericsson is another step towards making VoLTE technology a commercial reality," said Cristiano.

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