System frame number information transmission method, base station, terminal and system

Provided are a system frame number information transmission method and system, the method comprising: a base station, in a cycle period of system frame number information, sets X resource locations for carrying the system frame number indication information; and the base station transmits, in each cycle period of the system frame number information, the system frame number indication information in at least one resource location. Also provided are a base station and terminal capable of improving the coverage of a smart-metering type MTC terminal device deployed in a low coverage environment, and ensuring normal communication of the MTC terminal device without adding extra stations or deploying a relay station.