China Mobile and Clearwire signed MoU "that lays the foundation for international roaming between China and the US using TD-LTE" /marketwatch.com
This agreement can serve as a blueprint for future roaming agreements with other members of the Global TD-LTE Initiative (GTI).
China Mobile already demonstrated the roaming capability between China Mobile Hong Kong's FDD LTE and China Mobile's TD-LTE pilot network in Hang Zhou.
China Mobile still has no license from the China's regulator. Clearwire is constracting LTE network in USA.