Frequency domain resource adjustment method and apparatus, indication information sending method and apparatus, and system

An apparatus comprising:

• a non-transitory memory storage comprising instructions;
• and
• one or more processors in communication with the memory storage, wherein the instructions, when executed by the one or more processors, cause the apparatus to:
• receive information about a guard time from a network device;
• determine the guard time based on the information about the guard time, the guard time being a period of time during which the apparatus is configured to change a frequency domain resource for communication of the apparatus;
• and
• adjust, during the guard time, the frequency domain resource for communication from a first frequency domain resource to a second frequency domain resource within the guard time.

An apparatus comprising:

• a non-transitory memory storage comprising instructions;
• and
• one or more processors in communication with the memory storage, wherein the instructions, when executed by the one or more processors, cause the apparatus to:
• determine to adjust a frequency domain resource of a terminal device from a first frequency domain resource to a second frequency domain resource for communication of the terminal device;
• and
• send information about a guard time to the terminal device, instructing the terminal device to adjust the frequency domain resource of the terminal device from the first frequency domain resource to the second frequency domain resource during the guard time.