WIRELESS POWER RECEPTION DEVICE, WIRELESS POWER TRANSMISSION DEVICE, AND COMMUNICATION METHOD BETWEEN WIRELESS POWER TRANSMISSION DEVICE AND WIRELESS POWER RECEPTION DEVICE

A wireless power reception device according to one embodiment of the present specification uses Bluetooth communication and/or in-band communication using an operating frequency of the wireless power, so as to communicate with a wireless power transmission device and control the reception of wireless power, and exchanges an application level message with the wireless power transmission device by using a data transmission stream that includes an auxiliary data control data packet (ADC) and an auxiliary data transport data packet (ADT), wherein the ADT includes a header and a message field, and the message field includes a data field including at least a part of the application level message and a length field including information related to the size of the data field.