WRC 2027 Agenda Items for WP 4A

This agenda item is to consider studies on sharing and compatibility and develop technical conditions for use of IMT in the frequency bands 4.4 - 4.8 GHz, 7.125 - 8.4 GHz (or parts of) and 14.8 - 15.35 GHz taking into account existing primary services operating in those bands or adjacent frequency bands.

The ITU-R is invited to study:

1. the technical, operational and regulatory issues pertaining to the possible use of the terrestrial component of IMT in these bands taking into account:

• the evolving needs to meet emerging demand for IMT
• technical and operational characteristics of terrestrial IMT that would operate in these bands including the evolution of IMT through advances in technology and spectrally efficient techniques
• deployment scenarios envisaged for IMT systems and related requirements of balanced coverage and capacity
• the needs of developing countries
• the time-frame in which spectrum would be needed

2. sharing and compatibility studies with a view to ensuring the protection of services for which the band is allocated on primary basis including protection of stations operating in international waters or airspace which cannot be registered in the MIFR without imposing additional regulatory or technical constraints on these services and also on services in adjacent bands

WRC-27 is invited to consider the results of the above studies and take necessary actions, as appropriate.

This agenda item is to consider possible additional allocations to the radiolocation service (RLS) on a primary basis in the frequency range 231-275 GHz and possible new identifications for the radiolocation service applications in frequency bands in the frequency range 275 - 700 GHz for millimetric and sub-millimetric wave imaging systems.

The ITU-R is invited to study:

1. technical and operational characteristics including protection criteria for receive-only and active millimetric and sub-millimetric wave RLS
2. studies on globally harmonized spectrum for RLS
3. sharing and compatibility studies (in-band and adjacent) for RLS and other services in the frequency range 231.5 - 275 GHz while ensuring protection for the current use and further development of the incumbent services allocated to this frequency range
4. sharing and compatibility studies (in-band and adjacent band) for RLS applications with EESS(passive), space research service (passive) and RAS applications in the frequency range 275-700 GHz while maintaining protection for the passive service applications identified in No. 5.565
5. sharing and compatibility studies (in-band and adjacent bands) for RLS applications with fixed service and land mobile service applications in the frequency range 275 - 450 GHz as identified in No. 5.564A

WRC-27 is invited to consider the results of the above studies and take necessary actions, as appropriate.

This agenda item is to consider PFD and EIRP limits for inclusion in Article 21 for the FSS, MSS and BSS to protect fixed and mobile services in the frequency bands 71 - 76 GHz and 81 - 86 GHz.

The ITU-R is invited to study PFD and EIRP limits to be included in Article 21 for FSS, MSS and BSS satellite services to protect current and planned fixed and mobile services in these frequency bands.

WRC-27 is invited to consider the results of the above studies and take necessary actions, as appropriate.

This agenda item is to consider the technical and operational issues and regulatory provisions for space-to-space links among GSO and non-GSO satellites in frequency bands 1 518 - 1 544 MHz, 1 545 - 1 559 MHz, 1 610 - 1 645.5 MHz, 1 646.5 - 1 660 MHz, 1 670 - 1 675 MHz and 2 483.5 - 2 500 MHz allocated to the MSS. The ITU-R is invited to:

1. study the technical and operational characteristics of different types of non-GSO space stations that operate or plan to operate space-to-space links with GSO networks in the frequency bands 1 626.5 - 1 645.5 MHz and 1 646.5 - 1 660 MHz (Earth-to-space) and 1 525 - 1 544 MHz and 1 545 - 1 559 MHz (space-to-Earth)
2. study the technical and operational characteristics of different types of non-GSO space stations that operate or plan to operate space-to-space links with non-GSO systems or GSO networks in the frequency bands 1 610 - 1 626.5 MHz and 1 670 - 1 675 MHz (Earth-to-space) and 1 518 - 1 525 MHz, 1 613.8 - 1 626.5 and 2 483.5 - 2 500 MHz (space-to-Earth)
3. study sharing and compatibility between space-to-space links in the cases described above with current and planned stations of the MSS, other existing primary services allocated in the same frequency bands, other existing primary services allocated in adjacent frequency bands and existing passive services allocated in adjacent frequency bands
4. develop technical conditions and regulatory provisions for the operation of space-to-space links in these bands including MSS (space-to-space) allocations of the additional of inter-satellite service (ISS)

Space-to-space links should only operate in the same direction as existing MSS allocations.

WRC-27 is invited to consider the results of the above studies and take necessary actions, as appropriate.

This agenda item is to consider studies of a possible new allocation to the MSS for direct connectivity between space stations and IMT user equipment to complement terrestrial IMT network coverage. The ITU-R is invited to:

1. study possible allocations to the MSS in the frequency range between 694/698 MHz and 2.7 GHz taking into account IMT frequency arrangements addressed in the most recent version of Recommendation ITU-R M.1036.
2. study spectrum requirements and on technical, operational and regulatory matters related to the implementation of MSS for direct connectivity to the IMT user equipment to complement the terrestrial IMT network coverage
3. study sharing and compatibility between incumbent service, including in adjacent frequency bands, to ensure the their protection
4. study possible technical and operational measures to ensure that stations in the MSS do not cause harmful interference or claim protection from, stations operating in the mobile service

WRC-27 is invited to consider the results of the above studies and take necessary actions, as appropriate.

This agenda item is consider studies on frequency-related matters, including possible new or modified space research service (space-to-space) allocations, for future development of communications on the lunar surface and between lunar orbit and the lunar surface. The ITU-R is invited to:

1. study the spectrum needs of systems in the SRS which may operate on the lunar surface or systems in lunar orbit communicating with systems on the lunar surface, in the frequency ranges:
   • 390 - 406.1 MHz, 420 - 430 MHz and 440 - 450 MHz outside the shielded zone of the Moon (SZM)
   • 2 400 - 2 690 MHz, 3 500 - 3 800 MHz, 5 150 - 5 725 MHz, 5 775 - 5 925 MHz, 7 190 - 7 235 MHz, 8 450 - 8 500 MHz and 25.25 - 28.35 GHz
2. study the technical and operational characteristics as well as protection criteria of systems in the SRS that are planned for operation in the frequency bands above as well as protection criteria to be applied for the protection of the radio astronomy service (RAS) and SRS active and passive sensors on the lunar surface and in lunar orbit
3. study the propagation considerations for lunar surface systems and lunar-orbiting systems operating in the frequencies above
4. study sharing and compatibility related to systems in the SRS that are planned for operation in the frequency ranges above to ensure protection of radiocommunication services in these bands (SRS, FSS, BSS, ISS, EESS, ISM, fixed, mobile etc.) and in particular the RAS
5. study potential new or modified frequency allocations and/or identifications to the SRS with appropriate regulatory provisions, for communications on the lunar surface or in lunar orbit communicating with systems on the lunar surface
6. to study spectrum needs for lunar communications which may be needed for communications between the Earth, lunar-orbiting spacecraft and the lunar surface
7. to study whether future radiocommunication systems in the vicinity of the Moon can be accommodated within existing SRS and whether the regulatory provisions described in the Radio Regulations are sufficient

With the exception of the last item, WRC-27 is invited to review the results of these studies and take necessary actions, as appropriate

Studies of technical and regulatory provisions necessary to protect radio astronomy operating in specific Radio Quiet Zones (RQZs) and, in frequency bands allocated to the radio astronomy service on a primary basis globally, from aggregate radio-frequency interference caused by systems in the non-geostationary-satellite orbit. The ITU-R is invited to:

1. study how interference from unwanted emissions from a single non-GSO satellite system operating in the adjacent and nearby frequency bands to those in Table 1 affects the operation of RAS station in bands for which they are primary
2. study how the aggregate interference from unwanted emissions from multiple non-GSO satellite systems in the adjacent and nearby frequency bands in Table 1 affect the operation of RAS stations in bands for which they are primary
3. study possible recognition of RQZs based on their characteristics and existing ITU-R studies
4. study how the aggregate interference from single and multiple non-GSO satellites systems affects the operation of RAS stations in the RQZs
5. study on new coexistence measures between non-GSO satellite systems and RAS station in the RQZs
6. study methods to calculate the necessary separation distances between gateways of non-GSO systems and RAS stations protected by the RQZs

WRC-23 is invited to review the results of these studies and take necessary actions, as appropriate

This agenda item is to consider regulatory provisions for receive-only space weather sensors and their protection in the Radio Regulations, taking into account the results of ITU Radiocommunication Sector studies, in accordance with Resolution 682. The ITU-R is invited to:

1. study spectrum needs and appropriate protection criteria for receive-only space weather sensors, as well as system characteristics, as appropriate
2. sharing and compatibility studies pertaining to potential new primary allocations to MetAids (space weather) in the frequency bands 27.5 - 28.0 MHz, 29.7 - 30.2 MHz, 32.3 - 32.6 MHz, 37.5 - 38.325 MHz, 73.0 - 74.6 MHz and 608 - 614 MHz for receive only sensors
3. study possible regulatory provisions in the Radio Regulations to accommodate the possibility for an administration that desires to notify a receive-only space weather sensor station to be included in the MIFR

Any possible new primary MetAids (space weather) allocations shall not claim protection from, nor constrain the future development of, incumbent services in these frequency bands or adjacent frequency bands

WRC-23 is invited to review the results of these studies and take necessary actions, as appropriate

This agenda item is to consider, based on the results of ITU Radiocommunication Sector studies, possible regulatory measures regarding the protection of the Earth exploration-satellite service (passive) and the radio astronomy service in certain frequency bands above 76 GHz from unwanted emissions of active services, in accordance with Resolution 712. The ITU-R is invited to:

1. study compatibility between the EESS(passive) and the corresponding active services in adjacent bands as listed below:

• EESS(passive) in 86-92 GHz, active services in 81-86 GHz (FSS UL, MS) and 92-94 GHz (MS, RLS)
• EESS(passive) in 114.25-116 GHz, active services in 111.8-114.25 GHz (FS, MS)
• EESS(passive) in 164-167 GHz, active services in 158.5-164 GHz (FS, FSS DL, MS, MSS DL) and 167-174.5 GHz (FS, FSS DL, ISS, MS)
• EESS(passive) in 200-209 GHz, active service in 191.8-200 GHz (FS, ISS, MS, MSS, RNS, RNSS) and in 209-217 GHz (FS, FSS UL, MS)

2. study compatibility between the RAS and the corresponding active services in adjacent bands as listed below:

• RAS in 76-81 GHz, active services in 71-76 GHz (FSS, MSS, BSS)
• RAS in 130-134 GHz, active services in 123-130 GHz (FSS, MSS, RNSS)
• RAS in 164-167 GHz, active services in 167-174.5 GHz (FSS)
• RAS in 226-231.5 GHz, active service in 232-235 GHz (FSS)

WRC-27 is invited to determine, based on the results of studies, any required regulatory measures regarding the protection of the EESS(passive) and RAS for the frequency bands listed above.

This agenda item is to consider possible primary allocations in all Regions to the Earth exploration-satellite service (passive) in the frequency bands 4 200 - 4 400 MHz and 8 400 - 8 500 MHz without protection from existing services in these frequency bands and in adjacent bands.