Many of the new LTE spectrum allocations are relatively small, often 10 – 20MHz in bandwidth, and this is a cause for concern. These LTE allocations are resulting in part from the digital dividend, and also from the pressure caused by the ever growing need for mobile communications. There are regular additions to the LTE frequency bands / LTE spectrum allocations as a result of negotiations at the ITU regulatory meetings. Superseded bands are indicated by a grey background. TDD LTE is popular in ISP and closed networks where there is either predominantly Data-centric use (rather than voice), no legacy of 2G/3G, or pressure on limited spectrum available.įrom Tables 5.5-1 “E-UTRA Operating Bands” and 5.6.1-1 “E-UTRA Channel Bandwidth” of 3GPP TS 36.101, the following table lists the specified frequency bands of LTE and the channel bandwidths each band supports. The TDD LTE bands are unpaired because the uplink and downlink share the same frequency, being time multiplexed. With the interest in TDD LTE, there are several unpaired frequency allocations that are being prepared for LTE TDD use.
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FDD LTE is popular for traditional cellular operators who already have established 2G and 3G services, where spectrum is traditionally “paired” as FDD. The separation must be sufficient to enable the roll-off of the antenna filtering to give sufficient attenuation of the transmitted signal within the receive band. If the signals are too close then the receiver may be “blocked” and the sensitivity impaired. The bands also have a sufficient separation to enable the transmitted signals not to unduly impair the receiver performance. The FDD LTE frequency bands are paired to allow simultaneous transmission on two frequencies. 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.
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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.
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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.