Tuesday, September 13, 2011

China Mobile and Clearwire Collaborate on TD-LTE Devices

China Mobile and Clearwire announced a collaboration to accelerate the development of TD-LTE devices. Specifically, the carriers will work jointly to further accelerate the time-to-market availability of high volume TD-LTE chipsets and devices that should be commercially available starting in 2012. In addition, the two companies will collaborate to enable worldwide data roaming among TD-LTE, FDD-LTE and other 2G/3G networks.


Both carriers support the global 2.5 GHz spectrum band for 4G deployments along with many other operators around the
world. To date, both China Mobile and Clearwire have conducted successful TD-LTE trials and tests using commercially
available/production-ready TD-LTE devices from numerous vendors.


"The availability and cost of TD-LTE devices are critical success factors for operators to deploy TD-LTE networks," said Mr. Jianzhou Wang, Chairman of China Mobile Communications Corporation. "The cooperation with Clearwire will leverage economies of scale in the two largest markets in the world to speed up the development of TD-LTE devices. We anticipate the widest variety and most cost effective high performance devices - modems, routers, smart phones and tablets - to provide end users with affordable advanced mobile broadband services."
http://www.clearwire.com

  • In August 2011, Clearwire confirmed its intention to deploy "LTE Advanced-ready" technology in its 4G network while restating its commitment to its existing 4G WiMAX network, which covers approximately 132 million people while serving 7.65 million retail and wholesale customers. The company expects to end 2011 with approximately 10 million 4G customers. Clearwire said the initial LTE deployment will target densely populated, urban areas of its existing 4G markets where current 4G usage demands are high.


    Clearwire said its LTE network will be "LTE Advanced-ready," meaning that it will use spectrum configurations capable of 100+ Mbps downlink speeds. The LTE implementation plan, which is subject to additional funding, contemplates deploying Time Division Duplex (TDD) LTE technology. The plan calls for upgrading the all-IP network architecture and base station radios, as well as some core network elements. The LTE overlay will include the use of multicarrier, or multichannel, wideband radios that will be carrier aggregation capable. Carrier aggregation is a key feature of LTE Advanced that will enable Clearwire to further leverage its spectrum depth to create larger "fat pipes" for deploying mobile broadband service. Clearwire holds an average of 160 MHz of spectrum nationwide, more than AT&T and T-Mobile together, in one contiguous band, enabling wider channels for high-bandwidth applications.


  • Also in August 2011, Clearwire confirmed that it is looking for $600 million in new funding for the LTE rollout. It is also seeking $150-350 million as working capital to support its existing operations.


  • In August 2010, Clearwire began testing coexistence scenarios for WiMAX and LTE in Phoenix using both Frequency Division Duplex (FDD) of 40 MHz of spectrum paired in 2 x 20 MHz contiguous channels ("LTE 2X"), and Time Division Duplex (TDD) configurations using 20 MHz of spectrum. Initial tests have recently confirmed that the company's LTE 2X trial network achieved peak download speeds on commercially available equipment and devices in excess of 90 Mbps and upload speeds of more than 30 Mbps. Clearwire expects to conclude the tests in Q1 2011. The company later updated the test reports noting consistent 120 Mbps downlinks using TDD-LTE.

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