Systems and networks for the fixed-satellite service and inter-satellite links in the fixed-satellite service, including associated tracking, telemetry and telecommand functions.
| Working Party 4A (WP 4A) | Efficient orbit/spectrum utilization |
| Working Party 4B (WP 4B) | Systems, performance, availability and maintenance |
| Working Party 4SNG (WP 4SNG) | Satellite news gathering (SNG), outside broadcast via satellite |