LTE Frequency Bands

LTE has been developed to operate on paired spectrum for Frequency Division Duplex (FDD), and unpaired spectrum for Time Division Duplex (TDD).

For an LTE radio system to facilitate bidirectional communication, it is necessary to implement a duplex scheme so that a device may transmit and receive without collision. In order to achieve high data rates, LTE operates full duplex whereby both downlink (DL) and uplink (UL) communication takes place simultaneously by separating DL and UL traffic either by frequency (i.e., FDD), or time periods (i.e., TDD).

While less efficient and more electrically complex to deploy, FDD tends to be more commonly deployed by operators due to refarming of existing 3G spectrum arrangements. 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. However, transmission timing must be synchronised between base stations, introducing complexity, along with guard periods being required between DL and UL subframes, which reduces capacity.

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 DL bands[5]. 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. 14) [September 2017], and LTE-U SDL Technical Report

E-UTRA band Band Name Uplink (MHz) Downlink (MHz) UL EARFCN DL EARFCN Duplex spacing (MHz) Channel bandwidths
1 2100 1920 - 1980 2110 - 2170 18000 - 18599 0 - 599 190 5, 10, 15, 20
2 1900 1850 - 1910 1930 - 1990 18600 - 19199 600 - 1199 80 1.4, 3, 5, 10, 15, 20
3 1800 1710 - 1785 1805 -1880 19200 - 19949 1200 - 1949 95 1.4, 3, 5, 10, 15, 20
4 1700 1710 - 1755 2110 - 2155 19950 - 20399 1950 - 2399 400 1.4, 3, 5, 10, 15, 20
5 850 824 - 849 869 - 894 20400 - 20649 2400 - 2649 45 1.4, 3, 5, 10
6 850 830 - 840 875 - 885 20650 - 20749 2650 - 2749 35 5, 10
7 2600 2500 - 2570 2620 - 2690 20750 - 21449 2750 - 3449 120 5, 10, 15, 20
8 900 880 - 915 925 - 960 21450 - 21799 3450 - 3799 45 1.4, 3, 5, 10
9 1800 1749.9 - 1784.9 1844.9 - 1879.9 21800 - 22149 3800 - 4149 95 5, 10, 15, 20
10 1700 1710 - 1770 2110 - 2170 22150 - 22749 4150 - 4749 400 5, 10, 15, 20
11 1500 1427.9 - 1452.9 1475.9 - 1500.9 22750 - 22949 4750 - 4949 48 5, 10
12 700 698 - 716 728 - 746 23010 - 23179 5010 - 5179 30 1.4, 3, 5, 10
13 700 777 - 787 746 - 756 23180 - 23279 5180 - 5279 -31 5, 10
14 700 788 - 798 758 - 768 23280 - 23379 5280 - 5279 -30 5, 10
15 2600 1900 - 1920 2600 - 2620 - - 700 Obsolete
16 2600 2010 - 2025 2585 - 2600 - - 575 Obsolete
17 700 704 - 716 734 - 746 23730 - 23849 5730 - 5849 30 5, 10
18 850 815 - 830 860 - 875 23850 - 23999 5850 - 5999 45 5, 10, 15
19 850 830 - 845 875 - 890 24000 - 24149 6000 - 6149 45 5, 10, 15
20 800 832 - 862 791 - 821 24150 - 24449 6150 - 6449 -41 5, 10, 15, 20
21 1500 1447.9 - 1462.9 1495.5 - 1510.9 24450 - 24599 6450 - 6599 48 5, 10, 15
22 3500 3410 - 3500 3510 - 3600 24600 - 25399 6600 - 7399 100 5, 10, 15, 20
23 2000 2000 - 2020 2180 - 2200 25500 - 25699 7500 - 7699 180 1.4, 3, 5, 10, 15, 20
24 1600 1625.5 - 1660.5 1525 - 1559 25700 - 26039 7700 - 8039 -101.5 5, 10
25 1900 1850 - 1915 1930 - 1995 26040 - 26689 8040 - 8689 80 1.4, 3, 5, 10, 15, 20
26 850 814 - 849 859 - 894 26690 - 27039 8690 - 9039 45 1.4, 3, 5, 10, 15
27 850 807 - 824 852 - 869 27040 - 27209 9040 - 9209 45 1.4, 3, 5, 10
28 700 703 - 748 758 - 803 27210 - 27659 9210 - 9659 55 3, 5, 10, 15, 20
29 700 DL CA only 717 - 728 - 9660 - 9769 N/A 3, 5, 10
30 2300 2305 - 2315 2350 - 2360 27660 - 27710 9770 - 9869 45 5, 10
31 450 452.5 - 457.5 462.5 - 467.5 27760 - 27785 9870 - 9919 10 1.4, 3, 5
32 1500 DL CA only 1452 - 1496 - 9920 - 10359 N/A 5, 10, 15, 20
65 2100 1920 – 2010 2110 – 2200 131072 - 131971 65536 - 66435 190 5, 10, 15, 20
66 1700 1710 – 1780 2110 – 2200 131972 - 132671 66436 - 67335 400 1.4, 3, 5, 10, 15, 20
67 700 DL CA only 738 – 758 - 67336 - 67535 N/A 5, 10, 15, 20
68 700 698 – 728 753 – 783 132672 - 132971 67536 - 67835 55 5, 10, 15
69 2600 DL CA only 2570 – 2620 - 67836 - 68335 N/A  
70 1700 1695 – 1710 1995 – 2020 132972 - 133121 68336 - 68585 295 5, 10, 15, 20
71 600 663 - 698 617 - 652 133122 - 133471 68586 - 68935 -46 5, 10, 15, 20
252 5200 DL CA only 5150 - 5250 - 255144 - 256143 100 20
255 5800 DL CA only 5725 - 5850 - 261519 - 262143 125 20

TDD LTE Frequency Bands

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.

Band 47 has been introduced for applications such as Vehicle to Everything (V2X) communications, which is positioned in the U-NII-3 5 GHz unlicensed band. Cellular V2X (C-V2X) may require the use of unlicensed bands to solve regulatory issues related to LTE-Direct, where devices broadcast directly to nearby devices[6]. Like all unlicensed band LTE technologies, V2X operates Band 47 only in carrier aggregation with the operator's licensed band.

The below table lists Time Division Duplex LTE bands, compiled from 3GPP 36.101 (Rel 14 September 2016).

E-UTRA band Band name Operating band (MHz) EARFCN Channel bandwidths
33 2100 1900 – 1920 36000 - 36199 5, 10, 15, 20
34 2100 2010 – 2025 36200 - 36349 5, 10, 15
35 1900 1850 – 1910 36350 - 36949 1.4, 3, 5, 10, 15, 20
36 1900 1930 – 1990 36950 - 37549 1.4, 3, 5, 10, 15, 20
37 1900 1910 – 1930 37550 - 37749 5, 10, 15, 20
38 2600 2570 – 2620 37750 - 38249 5, 10, 15, 20
39 1900 1880 – 1920 38250 - 38649 5, 10, 15, 20
40 2300 2300 – 2400 38650 - 39649 5, 10, 15, 20
41 2500 2496 – 2690 39650 - 41589 5, 10, 15, 20
42 3500 3400 – 3600 41590 - 43589 5, 10, 15, 20
43 3700 3600 – 3800 43590 - 45589 5, 10, 15, 20
44 700 703 – 803 45590 - 46589 3, 5, 10, 15, 20
45 1500 1447 – 1467 46590 - 46789 5, 10, 15, 20
46 5200 5150 – 5925 46790 - 54539 10, 20
47 5800 5855 - 5925 54540 - 55239 10, 20

 

References

[1] 3GPP TSG, "Evolved Universal Terrestrial Radio Access; User Equipment radio transmission and reception (Release 14)", 3GPP, Valbonne, France, 3GPP TS 36.101 V14.1.0, Sept. 2016.

[2] LTE-U Forum, "LTE-U Technical Report Coexistence Study for LTE-U SDL",  LTE-U Forum Companies, V1.0, Feb. 2015.

[3] Radio-Electronics, LTE FDD, TDD, TD-LTE Duplex Schemes, [Online], Available: http://www.radio-electronics.com/info/cellulartelecomms/lte-long-term-evolution/lte-fdd-tdd-duplex.php

[4] Qualcomm, "Making the Best Use of Unlicensed Spectrum for 1000x", Qualcomm Technologies, San Diego, CA, Sept. 2015.

[5] 4G Americas, "LTE Carrier Aggregation Technology Development and Deployment Worldwide", 4G Americas, Oct. 2014.

[6] Qualcomm, "Leading the world to 5G: Cellular Vehicle-to-Everything (C-V2X) technologies", Qualcomm Technologies, San Diego, CA, June 2016.