5.388 The frequency bands 1 885-2 025 MHz and 2 110-2 200 MHz are intended for use, on a worldwide basis, by administrations wishing to implement International Mobile Telecommunications (IMT). Such use does not preclude the use of these frequency bands by other services to which they are allocated. The frequency bands should be made available for IMT in accordance with Resolution 212 (Rev.WRC 15)* (see also Resolution 223 (Rev.WRC 15)*). (WRC 15)
5.388A In Regions 1 and 3, the bands 1 885-1 980 MHz, 2 010-2 025 MHz and 2 110-2 170 MHz and, in Region 2, the bands 1 885-1 980 MHz and 2 110-2 160 MHz may be used by high altitude platform stations as base stations to provide International Mobile Telecommunications (IMT), in accordance with Resolution 221 (Rev.WRC 07). Their use by IMT applications using high altitude platform stations as base stations does not preclude the use of these bands by any station in the services to which they are allocated and does not establish priority in the Radio Regulations. (WRC-12)
5.388B In Algeria, Saudi Arabia, Bahrain, Benin, Burkina Faso, Cameroon, Comoros, Côte d’Ivoire, China, Cuba, Djibouti, Egypt, United Arab Emirates, Eritrea, Ethiopia, Gabon, Ghana, India, Iran (Islamic Republic of), Israel, Jordan, Kenya, Kuwait, Lebanon, Libya, Mali, Morocco, Mauritania, Nigeria, Oman, Uganda, Pakistan, Qatar, the Syrian Arab Republic, Senegal, Singapore, Sudan, South Sudan, Tanzania, Chad, Togo, Tunisia, Yemen, Zambia and Zimbabwe, for the purpose of protecting fixed and mobile services, including IMT mobile stations, in their territories from co channel interference, a high altitude platform station (HAPS) operating as an IMT base station in neighbouring countries, in the frequency bands referred to in No. 5.388A, shall not exceed a co-channel power flux-density of −127 dB(W/(m² · MHz)) at the Earth’s surface outside a country’s borders unless explicit agreement of the affected administration is provided at the time of the notification of HAPS. (WRC 19)

Wiki entries

High Altitude Platform Station (HAPS)

Current Use 1885–1980 MHz HAPS service links for IMT in Regions 1, 2, & 3 (per 5.388A)

The ITU has identified various bands for use by High Altitude Platform Stations (HAPS), which are defined as "a station located on an object at an altitude of 20 to 50 km and at a specified, nominal, fixed point relative to the Earth."

One set of bands (47.2-47.5 and 47.9-48.2 GHz) is identified on a worldwide basis. The others apply regionally or in a subset of countries.

Although there was a flurry of activity related to HAPS beginning in the late 1990's, no HAPS systems were ever developed. As of 2015, there is renewed interest in HAPS for applications involving telecommunications from Unmanned Aerial Systems (UAS).

HAPS is declared as an application of the fixed service.

European Union 3G & 4G (LTE) Band

Current Use 1920–1980 MHz European Union 3G & 4G band

In November, 2012, the European Commission adopted new rules clearing the way for the frequency band 1920-1980 MHz, paired with 2110-2170 MHz, to be used for 4G (LTE) services, in addition to its existing designated use for 3G services.

Standard LTE Bands

Current Use 1930–1990 MHz LTE band 2 FDD downlink 1930–1995 MHz LTE band 25 FDD downlink 1920–1980 MHz LTE band 1 FDD uplink 1930–1990 MHz LTE band 36 TDD

The following bands have been defined by 3GPP as standard LTE bands for Frequency Division Duplex (FDD, where mobile and base stations transmit in separate bands) and Time Division Duplex (TDD, where mobiles and bases transmit and receive on the same frequency). These bands are defined in 3GPP TS 36.101 (link below).

Note that bands 15 & 16 and 30-32 are not defined, and the FDD band 29 is used for downlink-only for carrier aggregation, so it has no corresponding uplink band.

Uplinks refer to the frequencies used for handsets and other user devices to transmit to the base station, and downlinks refer to frequencies used by base stations to transmit to the user devices.

Broadband Personal Communications Service (PCS)

Current Use 1970–1975 MHz PCS F block (base transmit)

The broadband PCS band was originally 1930-1990 MHz (base transmit) paired with 1850-1910 MHz (mobile transmit). The paired band was subdivided into six sub-bands, A-F.

The spectrum in the 1910-1930 MHz portion was dedicated to low-power unlicensed PCS applications. However, the 1910-1920 MHz portion has since been further divided into a "G block" portion at 1910-1915 MHz (paired with 1990-1995 MHz) that was given to Nextel in return for Nextel vacating some 800 MHz spectrum that caused interference to Public Safety; and a "H block" portion at 1915-1920 MHz (paired with 1995-2000 MHz) that comprises the Advanced Wireless Services-2 (AWS-2) block.

The block 1920-1930 MHz is reserved for Unlicensed PCS operation pursuant to Part 15 subpart D.