OUT-OF-BAND COMMUNICATION IN WIRELESS POWER TRANSMISSION SYSTEM, AND CONFIGURATION METHOD AND DEVICE FOR OUT-OF-BAND COMMUNICATION

The present disclosure provides a method for wireless power transmission by a wireless power transmitter in a wireless power transmission system, and a device using same, the method comprising: receiving a configuration packet from a wireless power receiver in a configuration phase, wherein the configuration packet related to the wireless power receiver includes information about whether a function of out-of-band communication is supported or not; and transmitting or receiving a specific packet related to the out-of-band communication in a negotiation phase, wherein the specific packet includes information for reporting an operation executed in the out-of-band communication.