TDD/FDD频段划分
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2017-08-30
14:19:26
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FDD and TDD LTE frequency bands
FDD spectrum requires pair bands, one of the uplink and one for the downlink, and
TDD requires a single band as uplink and downlink are on the same frequency but time
separated. As a result, there are different LTE band allocations for TDD and FDD.
In some cases these bands may overlap, and it is therefore feasible, although unlikely
that both TDD and FDD transmissions could be present on a particular LTE frequency
band.
The greater likelihood is that a single UE or mobile will need to detect whether a
TDD or FDD transmission should be made on a given band. UEs that roam may encounter
both types on the same band. They will therefore need to detect what type of
transmission is being made on that particular LTE band in its current location.
The different LTE frequency allocations or LTE frequency bands are allocated numbers.
Currently the LTE bands between 1 & 22 are for paired spectrum, i.e. FDD, and LTE
bands between 33 & 41 are for unpaired spectrum, i.e. TDD.
LTE frequency band definitions
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