Method of serving energy information in network and devices for performing the same

A device for serving energy information in a network, the device comprising:

• at least one processor including processing circuitry;
• and
• memory storing instructions,
• wherein the instructions, when executed individually or collectively by the at least one processor, cause the device to:
• collect first user equipment (UE)-related energy consumption information from operation, administration, and maintenance (OAM),
• collect second UE-related energy consumption information from a fifth generation core (5GC) network function (NF),
• calculate energy consumption information in a unit of required granularities based on the first UE-related energy consumption information and the second UE-related energy consumption information,
• receive a request for energy information from an NF consumer, and
• provide energy consumption information in the unit of required granularities to the NF consumer.