Abstract: A transmission control method in a satellite communication system and a related apparatus are provided. A terminal may determine, through satellite selection, a target satellite with a strongest signal from at least one satellite in geosynchronous orbit. The terminal may determine a satellite transmission link direction based on location information of the terminal and location information of the target satellite and may further determine a radiation direction of a satellite antenna in the terminal based on geomagnetic data and attitude data of the terminal. The terminal may enable, by using the satellite transmission link direction and the radiation direction of the satellite antenna, the radiation direction of the satellite antenna in the terminal to be aligned with the target satellite. After aligning with the target satellite, the terminal may send a first data packet to the target satellite along the radiation direction of the satellite antenna.

Abstract: An application data transmission method, user equipment (UE), and system, the system including a network device and a UE, the network device configured to send a first message to the UE, the first message including UE route selection policy (URSP) information, the URSP information including an application store identifier, an application identifier, and slice parameter information, where the slice parameter information a sliced network, and where the user equipment is configured to run a first application, and to transmit data of the first application through the sliced network indicated by the slice parameter information, wherein the first application is from the application store indicated by the application store identifier in the USRP information, and where an application identifier of the first application is the same as the application identifier in the URSP information.