The invention provides a wireless communication system. The system comprises a mobile core network configured at a network side and mobile network devices configured at a wireless side. The mobile core network comprises a controller gateway, a core network circuit domain device and a core network packet domain device. The mobile network devices comprise a base station and a base station controller. The base station communicates with the base station controller. The base station controller communicates with the controller gateway by a satellite. The controller gateway communicates with the core network circuit domain device, thus realizing circuit domain service. The controller gateway communicates with the core network packet domain device, thus realizing data service. Moreover, the invention also provides a service processing method and device. According to the technical schemes, on the premise of normally providing mobile communication service, the satellite bandwidth is reduced maximumly, the utilization ratio of the satellite bandwidth is improved, the operation cost is reduced, and moreover, the call experience and data networking experience of a user can be improved.