Fake base station identification method, related device, and system

A terminal device, comprising:

• at least one processor;
• a memory coupled to the at least one processor, the memory comprising instructions that, when executed by the at least one processor, cause the terminal device to:
• generate a cell monitoring report, wherein the cell monitoring report comprises an identifier of a cell on which the terminal device camps on for a camping time period and first time information, and the first time information indicates a time point at which or a time period in which the terminal device does not receive a paging message in the camping time period;
• and
• send the cell monitoring report to a network device.

A network device, comprising:

• at least one processor;
• a memory coupled to the at least one processor, the memory comprising instructions that, when executed by the at least one processor, cause the network device to:
• receive a cell monitoring report sent by a terminal device, wherein the cell monitoring report comprises an identifier of a cell on which the terminal device camps for a camping time period and first time information, and the first time information indicates a time point at which or a time period in which the terminal device does not receive a paging message in the camping time period;
• and
• identify a fake base station based on the cell monitoring report.