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4G-LTE spectrum allocation and bands

There are 55 LTE bands in existence, partly due to spectrum fragmentation and market strategies. The proliferation of LTE bands is also a manifestation of government allocation and the auctioning of frequency space. LTE is also split into two categories that are not compatible:

Time Division Duplex (TDD): TDD uses a single frequency space for uplink and downlink data. The transmission direction is controlled via time slots.
Frequency Division Duplex (FDD): In an FDD configuration, the base station (eNodeB) and the user equipment (UE) will open a pair of frequency spaces for uplink and downlink data. An example may be LTE band-13, which has an uplink range of 777 to 787 MHz and a downlink range of 746 ...

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