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There are two major differences between LTE-TDD and LTE-FDD: how data is uploaded and downloaded, and what frequency spectra the networks are deployed in. While LTE-FDD uses paired frequencies to upload and download data,[75] LTE-TDD uses a single frequency, alternating between uploading and downloading data through time.[76][77] The ratio between uploads and downloads on a LTE-TDD network can be changed dynamically, depending on whether more data needs to be sent or received.[78] LTE-TDD and LTE-FDD also operate on different frequency bands,[79] with LTE-TDD working better at higher frequencies, and LTE-FDD working better at lower frequencies.[80] Frequencies used for LTE-TDD range from 1850 MHz to 3800 MHz, with several different bands being used.[81] The LTE-TDD spectrum is generally cheaper to access, and has less traffic.[79] Further, the bands for LTE-TDD overlap with those used for WiMAX, which can easily be upgraded to support LTE-TDD.[79]
Trials of LTE-TDD technology began as early as 2010, with Reliance Industries and Ericsson India conducting field tests of LTE-TDD in India, achieving 80 megabit-per second download speeds and 20 megabit-per-second upload speeds.[92] By 2011, China Mobile began trials of the technology in six cities.[73] 153554b96e
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