China Mobile, the world's largest mobile operator, and Clearwire Corporation, a provider of 4G wireless broadband services in the United States, on Tuesday announced, in conjunction with the Global TD-LTE Initiative (GTI), an agreement on common test specifications and joint interoperability testing (IOT) for TD-LTE devices in the global band configurations, including 2.3GHz to 2.7GHz.
The GTI is a virtual platform to advocate cooperation among global operators to promote TD-LTE , with members including Sprint, SK Telecom, Vodafone and KT.
Beginning this month, China Mobile (Beijing, P.R.C.), Clearwire (Kirkland, Wash., USA) and other GTI operators will establish 4G mobile broadband labs featuring a joint test platform and IOT environment for TD-LTE devices.
The expected availability of the Quad-Band LTE 2.3-2.7 GHz spectrum range, in addition to certain other bands like 1.9GHz, as well as FDD and TD-LTE mobility interactions, makes it an ideal global configuration for mass 4G  marketing worldwide, according to Clearwire. The labs will evaluate commercial TD-LTE devices simultaneously in the U.S., China, and other markets using common testing methodology, equipment, and infrastructure, says the company.
"Converged with LTE FDD, TD-LTE has become the major global 4G  technology for unpaired spectrum," says Mr. Li Zhengmao, Vice President of China Mobile. "Our goal is to build efficient, low cost common infrastructure and terminal for different global markets with different spectrum to support mobile internet. By closely working with global operators such as Clearwire, we could leverage the experience, expertise, and scale to achieve this goal. This is also the reason why we create GTI and promote it jointly."
Clearwire plans to conduct its TD-LTE common IOT in Phoenix, Arizona and Herndon, Virginia. China Mobile's testing will be carried out in Beijing and other TD-LTE trial cities. The joint test platforms will be open for device IOT by key participants in early 2012, says Clearwire.