There is a large number of allocations or radio spectrum that has been reserved for FDD, frequency division duplex, LTE use. LTE frequency band 4G LTE frequency band definitions FDD LTE frequency band allocations FDD, and LTE bands between 33 & 41 are for unpaired spectrum, i.e. Currently the LTE bands between 1 & 22 are for paired spectrum, i.e. The different LTE frequency allocations or LTE frequency bands are allocated numbers. They will therefore need to detect what type of transmission is being made on that particular LTE band in its current location. UEs that roam may encounter both types on the same 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. 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. As a result, there are different LTE band allocations for TDD and FDD. FDD and TDD LTE frequency bandsįDD 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. Many of the LTE frequency bands are already in use for other cellular systems, whereas other LTE bands are new and being introduced as other users are re-allocated spectrum elsewhere. There are a growing number of LTE frequency bands that are being designated as possibilities for use with LTE.
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