516BThe following bands are identified for use by high-density applications in the fixed–satellite service:

516B The following bands are identified for use by high-density applications in the fixed–satellite service:

17.3–17.7 GHz (space-to-Earth) in Region 1,

18.3–19.3 GHz (space-to-Earth) in Region 2,

19.7–20.2 GHz (space-to-Earth) in all Regions,

39.5–40 GHz (space-to-Earth) in Region 1,

40–40.5 GHz (space-to-Earth) in all Regions,

40.5–42 GHz (space-to-Earth) in Region 2,

47.5–47.9 GHz (space-to-Earth) in Region 1,

48.2–48.54 GHz (space-to-Earth) in Region 1,

49.44–50.2 GHz (space-to-Earth) in Region 1,

and

27.5–27.82 GHz (Earth-to-space) in Region 1,

28.35–28.45 GHz (Earth-to-space) in Region 2,

28.45–28.94 GHz (Earth-to-space) in all Regions,

28.94–29.1 GHz (Earth-to-space) in Regions 2 and 3,

29.25–29.46 GHz (Earth-to-space) in Region 2,

29.46–30 GHz (Earth-to-space) in all Regions,

48.2–50.2 GHz (Earth-to-space) in Region 2.

This identification does not preclude the use of these frequency bands by other fixed–satellite service applications or by other services to which these frequency bands are allocated on a co-primary basis and does not establish priority in these Radio Regulations among users of the frequency bands. Administrations should take this into account when considering regulatory provisions in relation to these frequency bands. See Resolution 143 (Rev.WRC-19). (WRC-19)

517 In Region 2, use of the fixed–satellite (space-to-Earth) service in the frequency band 17.3–17.8 GHz shall not cause harmful interference to nor claim protection from assignments in the broadcasting–satellite service operating in conformity with the Radio Regulations. (WRC-23)

517A The operation of earth stations in motion communicating with geostationary fixed–satellite service space stations within the frequency bands 17.7–19.7 GHz (space-to-Earth) and 27.5–29.5 GHz (Earth-to-space) shall be subject to the application of Resolution 169 (Rev.WRC-23). (WRC-23)

517B The operation of aeronautical and maritime earth stations in motion communicating with non-geostationary space stations in the fixed-satellite service in the frequency bands 17.7-18.6 GHz, 18.8-19.3 GHz and 19.7-20.2 GHz (space-to-Earth) and 27.5-29.1 GHz and 29.5-30 GHz (Earth-to-space) shall be subject to the application of Resolution 123 (WRC-23). (WRC-23)

519 Additional allocation: the bands 18–18.3 GHz in Region 2 and 18.1–18.4 GHz in Regions 1 and 3 are also allocated to the meteorological–satellite service (space-to-Earth) on a primary basis. Their use is limited to geostationary satellites. (WRC-07)

520 The use of the band 18.1–18.4 GHz by the fixed–satellite service (Earth-to-space) is limited to feeder links of geostationary-satellite systems in the broadcasting–satellite service. (WRC-2000)

521 Alternative allocation: in the United Arab Emirates, the frequency band 18.1–18.4 GHz is allocated to the fixed, fixed–satellite (space-to-Earth) and mobile services on a primary basis (see No. 33). The provisions of No. 519 also apply. (WRC-23)

521A For use of the frequency bands 18.1-18.6 GHz, 18.8-20.2 GHz and 27.5-30 GHz, or parts thereof, by space stations in the inter-satellite service, Resolution 679 (WRC-23) shall apply. Such use is limited to space research, space operation and/or Earth exploration-satellite applications, and also transmissions of data originating from industrial and medical activities in space. When using these frequencies, administrations shall ensure that this inter-satellite service is used only for the aforementioned purposes and is not subject to coordination under No. 9.11A. For use of the frequency bands 18.1-18.6 GHz, 18.8-20.2 GHz, 27.5-29.1 GHz and 29.5-30 GHz by space stations, the allocation is limited to inter-satellite links between non-geostationary satellites or between non-geostationary satellites and geostationary satellites. For use of the frequency band 29.1-29.5 GHz by space stations, the allocation is limited to inter-satellite links between non-geostationary satellites and geostationary satellites. No. 4.10 does not apply. (WRC-23)

522A The emissions of the fixed service and the fixed–satellite service in the band 18.6–18.8 GHz are limited to the values given in Nos. 21.5A and 21.16.2, respectively. (WRC-2000)

522B The use of the band 18.6–18.8 GHz by the fixed–satellite service is limited to geostationary systems and systems with an orbit of apogee greater than 20 000 km. (WRC-2000)

522C In the band 18.6–18.8 GHz, in Algeria, Saudi Arabia, Bahrain, Egypt, the United Arab Emirates, Jordan, Lebanon, Libyan Arab Jamahiriya, Morocco, Oman, Qatar, the Syrian Arab Republic, Tunisia and Yemen, fixed-service systems in operation at the date of entry into force of the Final Acts of WRC-2000 are not subject to the limits of No. 21.5A. (WRC-2000)

523A The use of the bands 18.8–19.3 GHz (space-to-Earth) and 28.6–29.1 GHz (Earth-to-space) by geostationary and non-geostationary fixed–satellite service networks is subject to the application of the provisions of No. 9.11A and No. 22.2 does not apply. Administrations having geostationary-satellite networks under coordination prior to 18 November 1995 shall cooperate to the maximum extent possible to coordinate pursuant to No. 9.11A with non-geostationary-satellite networks for which notification information has been received by the Bureau prior to that date, with a view to reaching results acceptable to all the parties concerned. Non-geostationary-satellite networks shall not cause unacceptable interference to geostationary fixed–satellite service networks for which complete Appendix 4 notification information is considered as having been received by the Bureau prior to 18 November 1995. (WRC-97)

523B The use of the band 19.3–19.6 GHz (Earth-to-space) by the fixed–satellite service is limited to feeder links for non-geostationary-satellite systems in the mobile–satellite service. Such use is subject to the application of the provisions of No. 9.11A, and No. 22.2 does not apply.

523C No. 22.2 shall continue to apply in the bands 19.3–19.6 GHz and 29.1–29.4 GHz between feeder links of non-geostationary mobile–satellite service networks and those fixed–satellite service networks for which complete Appendix 4 coordination information, or notification information, is considered as having been received by the Bureau prior to 18 November 1995. (WRC-97)

523D The use of the band 19.3–19.7 GHz (space-to-Earth) by geostationary fixed–satellite service systems and by feeder links for non-geostationary-satellite systems in the mobile–satellite service is subject to the application of the provisions of No. 9.11A, but not subject to the provisions of No. 22.2. The use of this band for other non-geostationary fixed–satellite service systems, or for the cases indicated in Nos. 523C and 523E, is not subject to the provisions of No. 9.11A and shall continue to be subject to Articles 9 (except No. 9.11A) and 11 procedures, and to the provisions of No. 22.2. (WRC-97)

523DA In order to protect feeder links of non-geostationary networks in the mobile-satellite service in the frequency band 19.3-19.7 GHz, the power flux-density values produced at the surface of the Earth for all angles of arrival by a space station in the inter-satellite service operating in this band in accordance with Resolution 679 (WRC-23) shall not exceed −140 dB(W/m2) in any 1 MHz within 150 km of any of the above feeder-link earth stations recorded in the Master International Frequency Register. (WRC-23)

523E No. 22.2 shall continue to apply in the bands 19.6–19.7 GHz and 29.4–29.5 GHz, between feeder links of non-geostationary mobile–satellite service networks and those fixed–satellite service networks for which complete Appendix 4 coordination information, or notification information, is considered as having been received by the Bureau by 21 November 1997. (WRC-97)

524 Additional allocation: in Afghanistan, Algeria, Saudi Arabia, Bahrain, Brunei Darussalam, Cameroon, China, Congo (Rep. of the), Costa Rica, Djibouti, Egypt, the United Arab Emirates, Gabon, Guatemala, Guinea, India, Iran (Islamic Republic of), Iraq, Israel, Japan, Jordan, Kuwait, Lebanon, Malaysia, Mali, Morocco, Mauritania, Nepal, Nigeria, Oman, Pakistan, Palestine[13], the Philippines, Qatar, the Syrian Arab Republic, the Dem. Rep. of the Congo, the Dem. People’s Rep. of Korea, Singapore, Somalia, Sudan, South Sudan, Chad, Togo and Tunisia, the frequency band 19.7–21.2 GHz is also allocated to the fixed and mobile services on a primary basis. This additional use shall not impose any limitation on the power flux-density of space stations in the fixed–satellite service in the frequency band 19.7–21.2 GHz and of space stations in the mobile–satellite service in the frequency band 19.7–20.2 GHz where the allocation to the mobile–satellite service is on a primary basis in the latter frequency band. (WRC-23)

525 In order to facilitate interregional coordination between networks in the mobile–satellite and fixed–satellite services, carriers in the mobile–satellite service that are most susceptible to interference shall, to the extent practicable, be located in the higher parts of the bands 19.7–20.2 GHz and 29.5–30 GHz.

526 In the bands 19.7–20.2 GHz and 29.5–30 GHz in Region 2, and in the bands 20.1–20.2 GHz and 29.9–30 GHz in Regions 1 and 3, networks which are both in the fixed–satellite service and in the mobile–satellite service may include links between Earth stations at specified or unspecified points or while in motion, through one or more satellites for point-to-point and point-to-multipoint communications.

527 In the bands 19.7–20.2 GHz and 29.5–30 GHz, the provisions of No. 4.10 do not apply with respect to the mobile–satellite service.

527A The operation of earth stations in motion communicating with the fixed satellite service is subject to Resolution 156 (Rev.WRC-23). (WRC-23)

528 The allocation to the mobile–satellite service is intended for use by networks which use narrow spot-beam antennas and other advanced technology at the space stations. Administrations operating systems in the mobile–satellite service in the band 19.7–20.1 GHz in Region 2 and in the band 20.1–20.2 GHz shall take all practicable steps to ensure the continued availability of these bands for administrations operating fixed and mobile systems in accordance with the provisions of No. 524.

529 The use of the bands 19.7–20.1 GHz and 29.5–29.9 GHz by the mobile–satellite service in Region 2 is limited to satellite networks which are both in the fixed–satellite service and in the mobile–satellite service as described in No. 526.

529A In the frequency bands 20.2-21.2 GHz and 30-31 GHz, non-geostationary-satellite systems for which complete coordination or notification information, according to the case, is received by the Bureau as of 1 January 2025 shall not cause unacceptable interference to and shall not claim protection from geostationary-satellite networks in the mobile-satellite service operating in accordance with these Regulations. No. 43A does not apply. (WRC-23)

530A Unless otherwise agreed between the administrations concerned, any station in the fixed or mobile services of an administration shall not produce a power flux-density in excess of −120.4 dB(W/(m2·MHz)) at 3 m above the ground of any point of the territory of any other administration in Regions 1 and 3 for more than 20% of the time. In conducting the calculations, administrations should use the most recent version of Recommendation ITU‑R P.452 (see also the most recent version of Recommendation ITU‑R BO.1898). (WRC-15)

530B In the band 21.4–22 GHz, in order to facilitate the development of the broadcasting–satellite service, administrations in Regions 1 and 3 are encouraged not to deploy stations in the mobile service and are encouraged to limit the deployment of stations in the fixed service to point-to-point links. (WRC-12)

530E The allocation to the fixed service in the frequency band 21.4–22 GHz is identified for use in Region 2 by high-altitude platform stations (HAPS). This identification does not preclude the use of this frequency band by other fixed-service applications or by other services to which it is allocated on a co-primary basis, and does not establish priority in the Radio Regulations. Such use of the fixed-service allocation by HAPS is limited to the HAPS-to-ground direction, and shall be in accordance with the provisions of Resolution 165 (Rev.WRC-23). (WRC-23)