Nokia Solutions and Networks has successfully completed an extensive set of test cases for Voice over LTE (VoLTE) in China Mobile’s (CMCC) pre-commercial TD-LTE network in Fuzhou. The trials included NSN’s enhanced Single Radio Voice Call Continuity (eSRVCC) solution for a seamless experience and optimized behavior.

To verify the functionality and performance of VoLTE in its TD-LTE network, China Mobile set up parallel VoLTE trial projects with several mobile broadband equipment vendors in different parts of the country. NSN completed the TDD eSRVCC video call on January 4, 2014, and an extensive set of tests on January 29, 2014.

A video call made in an LTE network that utilizes eSRVCC allows a high-definition (HD) call that is established in the IP Multimedia Subsystem (IMS) over VoLTE and then handed over to 2G/3G using voice continuity. This means the voice portion of the call can continue seamlessly even if 4G coverage is no longer available.