Lte frequency bands

basic knowledge of Lte frequency bands

1. LTE Frequency Bands & Spectrum
Allocations

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‘There is a growing number of LTE frequency bands that are being designated as possibilities for use
with LTE. Many of the LTE frequency bands are already in use for other cellular systems, whereas
other LTE bands are now and being introduced as other users are re-allocated spectrum olsewnere,

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 tansmissions 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 TOD or FDD
transmission should be made on a given band. UES that roam may encounter both typas an 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, Le. FDD, and LTE bands between 33 & 41
are for unpaired spectrum, Le. TOD.

2. Duplex Spaoing

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LTE frequency band def

FDD LTE frequency band allocations

‘There is a large number of allocations or radio spectrum that has been reserved for FDO, frequency
division duplex, LTE use.

The FDD LTE frequency bands are paired to allow simultaneous transmission on two frequencies
‘The bands also have a sufficient separation to enable the transmitted signals not to unduly impair
the receiver performance. If the signals are too close then the receiver may be “blocked” and the
Sensitivity Impaired. The separation must be sufficient to enable the roll-off of the antenna fitering to
ive eufficient attenuation of the transmitted signal within the receive band,

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TDD LTE frequency band allocations

With the interest in TOD LTE, there are several unpaired frequency allocations that are being
prepared for LTR TDD use. The TDD LTE bands are unpaired because the uplink and downlink
share the same frequency. being time multiplexed.

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4. ‘There are regular additions to the LTE frequency bands / LTE spectrum allocations as a result of
negotiations at the ITU regulatory meetings. These LTE allocations ara resulting in part from the
digital dividend, and also from the pressure caused by the ever growing need for mobile
‘communications. Many of the new LTE spectrum allocations are relatively small, often 10 - 20MHz in
bandwidth, and this is a cause for concer. With LTE-Advanced needing bandwidths of 100 MHz,
‘channel aggregation over a wide set of frequencies many be needed, ana ins has been recognized
as a significant technological problem.