Ericsson and China Mobile has successfully demonstrated a dual mode HD voice over LTE (VoLTE) call between TD-LTE and LTE FDD based on ST-Ericsson's multimode modem and Renesas Mobile' quad-mode chipsets during the 2013 Mobile World Congress (MWC) in Barcelona. The demonstration was done on Ericsson's LTE TDD/FDD converged radio solution and IMS platform, adopting ST-Ericsson's Thor LTE modem and Renesas Mobile' quad-mode chipsets.  

The demonstration also achieved HD quality TD-LTE voice service. VoLTE has been deployed into commercial service with several operators, and the demand for TD-LTE voice services is also growing. As of January 2013, operators in 45 countries have launched HD voice over WCDMA/GSM/LTE in 61 live networks, supported by mainstream devices. HD voice over TD-LTE will ensure superior user experience also for TD-LTE subscribers in the near future.

At its MWC debut as an exhibitor, China Mobile showcased a series of innovative applications in an LTE TDD/FDD integrated network environment, and also demonstrated the complete TD-LTE end-to-end converged ecosystem. The network infrastructure on site at the China Mobile booth, as well as the integration of multi-frequency bands and multi-vendor systems and terminals, are provided by Ericsson.

In December 2012, Ericsson assisted China Mobile Hong Kong in demonstrating a live, seamless, bi-directional LTE TDD/FDD interworking on the converged LTE TDD/FDD network.