| Number | Category | Group | Title | 
    
      | 42-1/4 | (S1) | WP4A | Characteristics of antennas at earth stations in the fixed-satellite service
           
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      | 46-3/4 | (S2) | WP4B | Preferred multiple-access characteristics in the fixed-satellite service
           
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      | 70-1/4 | (S3) | WP4A | Protection of the geostationary-satellite orbit against unacceptable interference from transmitting earth stations in the fixed-satellite service at frequencies above 15 GHz
           
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      | 73-2/4 | (S2) | WP4B | Availability and interruptions to traffic on digital paths in the fixed satellite service
           
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      | 75-4/4 | (S2) | WP4B | Performance objectives of international digital transmission links in the fixed-satellite and mobile-satellite services
           Note - Suppressed on 15/01/18 (CACE/853)
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      | 83-6/4 | (S1) | WP4C | Efficient use of the radio spectrum and frequency sharing within the mobile-satellite service
           
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      | 84-4/4 | (S2) | WP4C | Use of non-geostationary-satellite orbits in mobile-satellite services
           
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      | 87-4/4 | (S2) | WP4B/WP4C | Transmission characteristics for a mobile-satellite communication system
           
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      | 88-1/4 | (S3) | WP4C | Propagation and mobile earth station antenna characteristics for mobile-satellite services
           
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      | 91-1/4 | (S2) | WP4C | Technical and operating characteristics of the radiodetermination-satellite service
           
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      | 109-1/4 | (S1) | WP4C | Global Maritime Distress and Safety System requirements for mobile-satellite systems operating in the bands 1 530-1 544 MHz and 1 626.5-1 645.5 MHz
           
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      | 110-1/4 | (S2) | WP4C | Interference to the aeronautical mobile-satellite (R) service
           
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      | 201-1/4 | (S2) | WP4C | Frequency sharing between mobile-satellite services and other services
           
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      | 203-1/4 | (S2) | WP4A | The impact of using small antennas on the efficient use of the geostationary-satellite orbit
           
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      | 205-1/4 | (S2) | WP4A/WP4C | Frequency sharing between non-geostationary satellite feeder links in the fixed-satellite service used by the mobile-satellite service
           
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      | 208/4 | (S3) | WP4A | Use of statistical and stochastic methods in evaluation of interference between satellite networks in the fixed-satellite service
           
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      | 209/4 | (S2) | WP4A | The use of frequency bands allocated to the fixed-satellite service for both the up and down links of geostationary-satellite systems
           
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      | 210-1/4 | (S1) | WP4B/WP4C | Technical characteristics for mobile earth stations operating with global non geostationary-satellite systems in the mobile-satellite service in the band 1-3 GHz
           
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      | 211-2/4 | (S2) | WP4C | Interference criteria and calculation methods for the mobile-satellite service
           
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      | 214/4 | (S1) | WP4A | Technical implications of steerable and reconfigurable satellite beams
           
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      | 217-2/4 | (S1) | WP4C | Interference to the radionavigation-satellite service in the ICAO global navigation satellite system
           
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      | 218-2/4 | (S2) | WP 4B | On-board processing in mobile-satellite service and fixed-satellite service systems
           
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      | 227/4 | (S1) | WP4B/WP4C | Technical and operational characteristics of emergency communications in the mobile-satellite service
           
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      | 231/4 | (S2) | WP4A | Sharing between networks of the fixed-satellite service using non-geostationary satellites and other networks of the fixed-satellite service
           
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      | 233/4 | (S2) | WP4A/WP4B | Dedicated user digital satellite communications systems and their associated architectures
           
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      | 236/4 | (S2) | WP4A | Interference criteria and calculation methods for the fixed-satellite service
           
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      | 244/4 | (S2) | WP4A | Sharing between feeder links of the mobile-satellite (non-geostationary) service in the band 5 091-5 250 MHz and the aeronautical radionavigation service in the band 5 000-5 250 MHz
           Note - Suppressed on 26/09/23 (CACE/1078)
 | 
    
      | 245-1/4 | (S1) | WP4A/WP4C | Out-of-band and spurious emission limits
           
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      | 248/4 | (S3) | WP4A | Frequency sharing between systems in the fixed-satellite service and wireless digital networks around 5 GHz
           
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      | 263-1/4 | (S1) | WP4B | Performance objectives of digital links in the fixed-satellite service for transmission of Internet or higher layer Protocol packets
           
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      | 264/4 | (S2) | WP4A/WP4B | Technical and operational characteristics of networks of the fixed-satellite service operating above 275 GHz
           
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      | 266/4 | (S2) | WP4A/WP4B | Technical characteristics of high-density fixed-satellite service earth stations operating with geostationary satellite orbit fixed-satellite service networks in the 20/30 GHz bands
           
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      | 267/4 | (S2) | WP4A | Technical and operational considerations relating to the advance publication, coordination and notification of fixed-satellite networks
           
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      | 268/4 | (S3) | WP4A | Development of methodologies for the assessment of satellite unwanted emission levels before launch
           
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      | 270-1/4 | (S2) | WP4A | Fixed-satellite service systems using very wideband spreading signals
           
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      | 271/4 | (S1) | WP4B | Interference between satellite news gathering (SNG) carriers by unintentional access
           
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      | 272/4 | (S2) | WP4A | Frequency sharing between the FSS and the space research service in the 37.5-38 GHz and 40-40.5 GHz bands
           
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      | 273/4 | (S1) | WP4A/WP4B/WP4C | Support of the modernization of civil aviation telecommunication systems and the extension of telecommunication systems to remote and developing regions with current and planned satellite networks
           
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      | 274/4 | (S1) | WP4A | Technical methods for improving the spectrum/orbit utilization
           
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      | 275/4 | (S2) | WP4B | Performance objectives of digital links in the fixed-satellite and mobile-satellite services forming elements of the Next Generation Network
           
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      | 276/4 | (S2) | WP4B | Availability of digital paths in mobile-satellite services
           
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      | 277-1/4 | (S2) | WP4B | Performance objectives for digital fixed-satellite and mobile-satellite services with variable bit-rate paths
           
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      | 278/4 | (S1) | WP4A | Use of operational facilities to meet power flux-density limitation under Article 21 of the Radio Regulations
           
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      | 279/4 | (S1) | WP4A/WP4B | Satellite broadcasting of high definition television
           
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      | 280/4 | (S1) | WP4A | Receiving earth station antennas for the broadcasting satellite service
           
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      | 281/4 | (S1) | WP4A/WP4B | Digital techniques in the broadcasting-satellite service (sound and television)
           
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      | 282/4 | (S1) | WP4A | Frequency sharing issues related to the introduction of the broadcasting-satellite service (sound) in the frequency range 1-3 GHz
           
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      | 283/4 | (S1) | WP4A | Sharing studies between high-definition television in the broadcasting-satellite service and other services
           
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      | 284/4 | (S1) | WP4A | Spectrum management issues related to the introduction of the broadcasting-satellite service (sound) in the frequency range 1-3 GHz
           Note - Suppressed on 28/01/2025 (CACE/1130)
 | 
    
      | 285/4 | (S1) | WP4A/WP4B | Digital broadcasting of multiple services and programmes in the broadcasting-satellite service
           
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      | 286/4 | (S2) | WP4B/WP4C | Contributions of the mobile and amateur services and associated satellite services to the improvement of disaster communications
           
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      | 287/4 | (S1) | WP4B | Technical and operational characteristics for packet network transmission in mobile-satellite services
           
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      | 288/4 | (S2) | WP4C | Characteristics and operational requirements of radionavigation-satellite service (space-to-Earth, space-to-space, Earth-to-space) systems
           
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      | 289/4 | (S1) | WP4B | Interactive satellite broadcasting systems (television, sound and data)
           
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      | 290/4 | (S1) | WP4A/WP4B | Broadcasting-satellite means for public warning, disaster mitigation and relief
           
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      | 291/4 | (S2) | WP4B | System architecture and performance aspects on integrated MSS systems
           
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      | 292/4 | (S1) | WP4B | UHDTV satellite broadcasting systems
           
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      | 293/4 | (S2) | WP4A | Antenna radiation diagrams/patterns for small (D/?  around 30) earth station antennas used in fixed-satellite and broadcasting-satellite systems
           
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