Clock synchronization mode indication method and communication apparatus

A first communication apparatus, comprising:

• a processor, configured to obtain first indication information and an identifier of a clock domain, wherein the first indication information and the identifier of the clock domain indicate a clock synchronization mode used in the clock domain in a communication system in which the first communication apparatus and a second communication apparatus are located, and the first communication apparatus is a terminal device, and the second communication apparatus is a user plane function network element;
• or the first communication apparatus is a user plane function network element, and the second communication apparatus is a terminal device;
• and
• the processor is further configured to process a precision time protocol PTP packet based on the first indication information.

A clock synchronization mode indication method, comprising:

• sending, by an application function, or a network exposure function, first indication information and an identifier of a clock domain;
• obtaining, by a first communication device, the first indication information and the identifier of a clock domain, wherein the first indication information and the identifier of the clock domain indicate a clock synchronization mode used in the clock domain in a communication system in which the first communication device and a second communication device are located, and the first communication device is a terminal device, and the second communication device is a user plane function network element;
• or the first communication device is a user plane function network element, and the second communication device is a terminal device;
• and
• processing, by the first communication device, a precision time protocol PTP packet based on the first indication information.

A communication system, comprising an application function, or a network exposure function, and further comprising a first communication device, wherein

• the application function or the network exposure function is configured to send first indication information and an identifier of a clock domain;
• the first communication device is configured to obtain the first indication information and the identifier of a clock domain, wherein the first indication information and the identifier of the clock domain indicate a clock synchronization mode used in the clock domain in a communication system in which the first communication device and a second communication device are located, and the first communication device is a terminal device, and the second communication device is a user plane function network element;
• or the first communication device is a user plane function network element, and the second communication device is a terminal device;
• and process a precision time protocol PTP packet based on the first indication information.