What is DL and UL in LTE?
UL/DL config specifies the uplink-downlink configuration of a TDD. frame. The uplink-downlink configuration determines which subframes are configured as downlink, which are uplink, and which are special subframes.
What is TDD LTE band?
The different 4G LTE frequency allocations or LTE frequency bands are allocated numbers. Currently the bands between 1 & 22 are for paired spectrum, i.e. FDD, and LTE bands between 33 & 41 are for unpaired spectrum, i.e. TDD.
What is DL and UL frequency?
In case of FDD (Frequency Division Duplex) LTE downlink channel (DL, eNB transmits UEs receive) and uplink channel (UL, UEs transmit eNB receives) are transmitted simultaneously on different frequencies. Also each band is marked by LTE release number where it was defined.
What is DL LTE?
In LTE the Downlink Shared Channel (DL-SCH) is a transport channel used for the transmission of user data, dedicated control and user-specific higher layer information and downlink system information. The Physical Downlink Shared Channel (PDSCH) is the physical channel that carries the DL-SCH coded data.
What is frequency band?
Frequency Bands and Applications
| Frequency Band Name | Acronym | Frequency Range |
|---|---|---|
| Very Low Frequency | VLF | 3 to 30 kHz |
| Low Frequency | LF | 30 to 300 kHz |
| Medium Frequency | MF | 300 to 3000 kHz |
| High Frequency | HF | 3 to 30 MHz |
What is band 40?
Band 40 is an LTE operating frequency Band. LTE is designed to work across a number of frequency bands – E-UTRA operating bands- currently ranging from 450 MHz up to 3.8GHz. The available bandwidths are also flexible starting with 1.4 MHz up to 20 MHz with Carrier Aggregation allowing use of wider multiples.
Why is TDD better than FDD?
In general, FDD is considered better for coverage and TDD better for capacity. While FDD uses separate frequencies for the uplink and the downlink, TDD uses a single frequency for both uplink and downlink, and therefore, they transmit at different times, making it more suitable when paired spectrum is not available.
What are the different types of LTE bands?
LTE Frequency Bands 1 FDD LTE Frequency Bands. The continuing evolution of carrier aggregation has resulted in several new bands added, including B29, B32, B67, and B69 used for downlink-only carrier aggregation, termed Supplemental 2 TDD LTE Frequency Bands. 3 References.
What are the Frequency Division Duplex LTE bands?
The below table lists Frequency Division Duplex LTE bands, compiled from 3GPP 36.101 (Rel. 16) [April 2019], and LTE-U SDL Technical Report . The increasing asymmetric demand for downlink data has also resulted in the introduction of Band 46, a downlink-only Supplemental DL band operating in the 5 GHz U-NII frequency range.
What are the supplementary DL LTE bands 252 and 255?
Supplemental DL bands 252 and 255 have been included as part of the LTE-U expansion into unlicensed 5 GHz bands U-NII-1 and U-NII-3, respectively. The below table lists Frequency Division Duplex LTE bands, compiled from 3GPP 36.101 (Rel. 16) [April 2019], and LTE-U SDL Technical Report .
What is the difference between ul/DL and TDD?
By comparison, deploying TDD requires less spectrum as well as eliminating then need for guard bands permitting a more efficient stacking of spectrum. UL/DL capacity can also be dynamically adjusted to match demand simply by devoting more airtime to one over the other.