The basic operation requirements and air-to-ground channel model of emergency cellular communication system based on large fixed-wing unmanned aircraft system are presented. The requirements are described in six categories: system architecture, UAV platform requirements, airborne emergency base station requirements, airborne satellite communication requirements and system operation requirements. Airborne emergency base station requirements include basic requirements, limited access capability requirements, capacity requirements, back-haul link requirements and reliability. The requirements of airborne satellite communication include technical index requirements, physical characteristic requirements, electrical characteristic requirements, reliability requirements, interface requirements and ground station requirements. Last but not least, system operation requirements refer to business requirements, business continuity requirements, and business continuous coverage area requirements.

This standard specifies technical requirements for emergency cellular communication systems based on large fixed-wing unmanned aircraft systems. It provides the basic operation requirements and air-to-ground channel model.