Method and apparatus for controlling power between plurality of devices through out-of-band communication in wireless power transmission system

A wireless power transmitter, comprising:

• a power converter related to transferring wireless power to a wireless power receiver;
• and
• a communicator/controller related to communicating with the wireless power receiver and controlling transfer of the wireless power,
• wherein the communicator/controller is configured to:
• receive a configuration packet informing availability of out of band (OB) from at least one wireless power receiver in a configuration phase;
• transmit a capability packet informing availability of the OB to the at least one wireless power receiver in a negotiation phase;
• and
• establish a bluetooth low energy (BLE) connection with the at least one wireless power receiver based on the configuration packet and the capability packet,
• wherein the BLE connection is a connection based on a BLE isochronous (ISO) channel, and
• wherein, through the BLE connection, the wireless power transmitter exchanges at least one power control data with the at least one wireless power receiver within at least one sub-event included in an interval of the BLE ISO channel.

A method for receiving a wireless power in a wireless power transfer system, the method performed by a wireless power receiver and comprising:

• transmitting a configuration packet informing availability of out of band (OB) to a wireless power transmitter in a configuration phase;
• receiving a capability packet informing availability of the OB from the wireless power transmitter in a negotiation phase;
• and
• establishing a bluetooth low energy (BLE) connection with the wireless power transmitter based on the configuration packet and the capability packet,
• wherein the BLE connection is a connection based on a BLE isochronous (ISO) channel, and
• wherein, through the BLE connection, the wireless power receiver exchanges at least one power control data with the wireless power transmitter within at least one sub-event included in an interval of the BLE ISO channel.