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A version of LTE for use in unpaired spectrum

Long Term Evolution Time Division Duplex (LTE TDD)

Michelle Donegan
The Buzz Bin
Michelle Donegan
11/15/2010
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Long Term Evolution Time Division Duplex (LTE TDD) is the version of LTE that uses the TDD modulation scheme in unpaired spectrum, whereby the same frequency channel is used for both downlink and uplink communication and signals are timed to enable smooth delivery of data. In contrast, LTE uses frequency division duplex (FDD) in paired spectrum, with a separate channel for uplinks and downloads.

FDD spectrum has traditionally been used for cellular voice and data services. TDD-based services are typically considered as more spectrum-efficient and better suited for "bursty" data services.

The most popular frequencies for which LTE TDD is being considered are 2.3GHz and 2.5GHz. The two most significant markets for LTE TDD developments are China and India. China Mobile is the chief proponent of LTE TDD.

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SriGSM
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SriGSM,
User Rank: Light Beer
12/5/2012 | 5:03:24 PM
re: Long Term Evolution Time Division Duplex (LTE TDD)




<div style="color: #000000; font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 10px; background-image: initial; background-attachment: initial; background-origin: initial; background-clip: initial; background-color: #ffffff; margin: 8px;">

If LTE-TDD optimizes the usage of the channels, why is it preferred only in China and India. Why is it not adopted in other countries?


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eudy
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eudy,
User Rank: Light Beer
12/5/2012 | 4:55:41 PM
re: Long Term Evolution Time Division Duplex (LTE TDD)


This is not so much a reply as it is a request. Would someone from LR-Mobile shed some light on the about question.


Thanks


Eudy

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