Communication method, apparatus, and system

A communication method, comprising:

• determining first information;
• and
• sending the first information to a terminal device or a second network device, wherein
• the first information comprises a first public land mobile network (PLMN) set of a first network device;
• the first information satisfying at least one of the following:
• the first information comprises first indication information, and the first indication information is used to indicate that the first PLMN set of the first network device and a second PLMN set of the terminal device have a same PLMN;
• or
• the first information comprises second indication information, and the second indication information is used to indicate that a registered public land mobile network (RPLMN) of the terminal device is comprised in the first PLMN set of the first network device;
• or
• the first information comprises third indication information, and the third indication information is used to indicate that it is allowable for the terminal device to send MDT information to the first network device, wherein
• the first PLMN set comprises a PLMN corresponding to at least one serving cell, wherein the second PLMN set comprises at least one PLMN, and wherein the at least one PLMN is used for logged MDT reporting performed by the terminal device and/or logged MDT measurement performed by the terminal device in an idle state and/or in an inactive state.

A communication apparatus, comprising

• a processor,
• a memory coupled to the processor to store instructions, which when executed by the processor, cause the processor to perform operations, the operations comprising:
• receiving first information from a first network device or a second network device;
• and
• determining, based on the first information, that it is allowable that a terminal device sends minimization of drive tests (MDT) information to the first network device.