Mobile World Congress 2012: Qualcomm to showcase VoIP-over-LTE call with single radio voice call continuity

By Telecom
Lead Team: Qualcomm, working with Ericsson, has completed the first voice call
handover from an LTE mobile network to a WCDMA network using single radio voice
call continuity (SRVCC).

enables continuity of service by switching to a WCDMA network when a consumer
on a VoLTE call leaves the LTE network’s coverage area. This milestone occurred
on December 23, 2011 with an Ericsson network using a handset which
incorporated Qualcomm’s Snapdragon S4 MSM8960 3G/LTE multimode processor.

will conduct a demonstration at Mobile World Congress 2012 in Barcelona.

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,” said Cristiano Amon, senior vice president of product
management, Qualcomm.

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. SRVCC enables a
single radio in the handset to execute a seamless handover of a voice call from
an LTE network to a 3G network.

CSFB 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. This allows OEMs to design handsets with lower power consumption
and component costs and a smaller size.

Given that
3G networks will continue to be deployed in conjunction with LTE networks for
quite some time, SRVCC and CSFB are essential to provide a seamless voice
experience to customers using LTE multimode handsets once VoLTE is commercially

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