# US 12,119,673 B2 · Method and apparatus for performing wireless power transmission on basis of authentication > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,119,673 B2 - Document ID: US12119673B2 - Status: Granted - Kind: B2 - Application number: 17/310,168 - Filed: 2019-10-16 - Published: 2024-01-25 - Granted: 2024-10-15 - Earliest claimed: 2019-01-23 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Jaehyu Kim; Jingu Choi; Minsoo Lee; Jinkwon Lim - Web page: https://patentgrep.com/patent/US12119673B2 ## CPC - H02J 50/80: involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices - H02J 50/10: using inductive coupling - H02J 50/12: of the resonant type - H04W 4/80: Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication - H04W 12/00: Security arrangements; Authentication; Protecting privacy or anonymity - H04W 12/06: Authentication - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The present disclosure relates to a device and a method for performing wireless power transmission on the basis of authentication. A wireless power receiver according to the present specification comprises a communication/control circuit for performing an authentication procedure on the basis of out-band communication, wherein the out-band communication is Bluetooth low energy (BLE) communication, and the communication/control circuit performs the authentication procedure on the basis of a logical link control and adaptation protocol (L2CAP) or a generic attribute profile (GATT) of the BLE communication. The present disclosure defines an authentication procedure or authentication messages of a wireless transmission device or a wireless reception device by using an out-band communication protocol, and thus can support various applications of wireless power. ## Claims ### Claim 1 A wireless power receiver for performing authentication based on out-band communication, the wireless power receiver comprising: a power pick-up circuit configured to receive wireless power from a wireless power transmitter by magnetic coupling to the wireless power transmitter at an operating frequency and convert an alternating current signal generated by the wireless power to a direct current signal; a communication/control circuit configured to receive the direct current signal from the power pick-up circuit and to perform at least one of in-band communication using the operating frequency or out-band communication using a frequency other than the operating frequency; and a load configured to be supplied with the direct current signal from the power pick-up circuit, wherein the communication/control circuit performs an authentication procedure based on the out-band communication, the wireless power receiver is an initiator of the authentication procedure, and the wireless power transmitter is a responder of the authentication procedure, wherein the out-band communication uses Bluetooth Low Energy (BLE), and the communication/control circuit performs the authentication procedure based on a Logical Link Control and Adaptation Protocol (L2CAP) or a Generic Attribute Profile (GATT) of the BLE, wherein the communication/control circuit performs the authentication procedure based on the L2CAP, and wherein the authentication procedure based on the L2CAP includes transmitting a Low Energy (LE) credit-based connection request message including identification information of a first channel related to the wireless power receiver to the wireless power transmitter, receiving an LE credit-based connection response message including identification information of a second channel related to the wireless power transmitter from the wireless power transmitter, transmitting a first LE information frame including the identification information of the second channel and an authentication request message to the wireless power transmitter, and receiving a second LE information frame including identification information of the first channel and an authentication response message from the wireless power transmitter. ### Claim 2 (depends on 1) The wireless power receiver of claim 1, wherein the communication/control circuit performs the authentication procedure based on the GATT, wherein the GATT-based authentication procedure includes performing a procedure for negotiating with the wireless power transmitter for a Maximum Transmission Unit (MTU), which is the maximum data size transmitted, by the communication/control circuit and transmitting or receiving an authentication-related message based on the MTU when the negotiation for the MTU is completed. ### Claim 3 (depends on 2) The wireless power receiver of claim 2, wherein, when the negotiated MTU is larger than the size of the authentication-related message, the GATT-based authentication procedure includes transmitting a WRITE REQUEST packet including an authentication request message to the wireless power transmitter by the communication/control circuit and receiving a NOTIFICATION packet including an authentication response message from the wireless power transmitter. ### Claim 4 (depends on 2) The wireless power receiver of claim 2, wherein, when the negotiated MTU is less than the size of the authentication-related message, the GATT-based authentication procedure includes transmitting a WRITE REQUEST packet including an authentication request message to the wireless power transmitter by the communication/control circuit, receiving a NOTIFICATION packet indicating that an authentication response message is DATA TOO BIG from the wireless power transmitter, transmitting a read Binary Large Object (BLOB) request packet indicating a byte offset of the authentication response message to the wireless power transmitter, and receiving a read BLOB response packet including a portion ranging from the byte offset to the negotiated MTU within the authentication response message from the wireless power transmitter. ### Claim 5 (depends on 2) The wireless power receiver of claim 2, wherein, when the negotiated MTU is less than the size of the authentication-related message, the GATT-based authentication procedure includes transmitting a WRITE REQUEST packet including an authentication request message to the wireless power transmitter by the communication/control circuit and receiving an authentication response message comprising a plurality of message fragments over a plurality of NOTIFICATION packets from the wireless power transmitter, wherein one NOTIFICATION packet includes one message fragment. ### Claim 6 (depends on 5) The wireless power receiver of claim 5, wherein the header a header for each of the plurality of message fragments includes a control field indicating the number of the plurality of message fragments or the number of the one message fragment. ### Claim 7 (depends on 1) The wireless power receiver of claim 1, wherein the authentication request message includes one of GET_CERTIFICATE, GET_DIGESTS, and CHANLLENGE; and the authentication response message includes one of CERTIFICATE, DIGESTS, and CHALLENGE_AUTH. ### Claim 8 (depends on 7) The wireless power receiver of claim 7, wherein the communication/control circuit includes an out-band communication module performing the out-band communication and an in-band communication module performing the in-band communication; and the authentication procedure is performed after handover from the in-band communication to the out-band communication is completed. ### Claim 9 A wireless power transmitter for performing authentication based on out-band communication, the wireless power transmitter comprising: a power conversion circuit configured to transfer wireless power to a wireless power receiver by magnetic coupling to the wireless power receiver at an operating frequency; and a communication/control circuit configured to perform at least one of in-band communication using the operating frequency or out-band communication using a frequency other than the operating frequency, wherein the communication/control circuit performs an authentication procedure based on the out-band communication, the wireless power receiver is an initiator of the authentication procedure, and the wireless power transmitter is a responder of the authentication procedure, wherein the out-band communication uses Bluetooth Low Energy (BLE), and the communication/control circuit performs the authentication procedure based on a Logical Link Control and Adaptation Protocol (L2CAP) or a Generic Attribute Profile (GATT) of the BLE, wherein the communication/control circuit performs the authentication procedure based on the L2CAP, and wherein the authentication procedure based on the L2CAP includes receiving a Low Energy (LE) credit-based connection request message including identification information of a first channel related to the wireless power receiver from the wireless power receiver, transmitting an LE credit-based connection response message including identification information of a second channel related to the wireless power transmitter to the wireless power receiver, receiving a first LE information frame including the identification information of the second channel and an authentication request message from the wireless power receiver, and transmitting a second LE information frame including identification information of the first channel and an authentication response message to the wireless power receiver. ### Claim 10 (depends on 9) The wireless power transmitter of claim 9, wherein the communication/control circuit performs the authentication procedure based on the GATT, wherein the GATT-based authentication procedure includes performing a procedure for negotiating with the wireless power receiver for a Maximum Transmission Unit (MTU), which is the maximum data size transmitted, by the communication/control circuit and transmitting or receiving an authentication-related message based on the MTU when the negotiation for the MTU is completed. ### Claim 11 (depends on 10) The wireless power transmitter of claim 10, wherein, when the negotiated MTU is larger than the size of the authentication-related message, the GATT-based authentication procedure includes receiving a WRITE REQUEST packet including an authentication request message from the wireless power receiver by the communication/control circuit and transmitting a NOTIFICATION packet including an authentication response message to the wireless power receiver. ### Claim 12 (depends on 10) The wireless power transmitter of claim 10, wherein, when the negotiated MTU is less than the size of the authentication-related message, the GATT-based authentication procedure includes receiving a WRITE REQUEST packet including an authentication request message from the wireless power receiver by the communication/control circuit, transmitting a NOTIFICATION packet indicating that an authentication response message is DATA TOO BIG to the wireless power receiver, receiving a read Binary Large Object (BLOB) request packet indicating a byte offset of the authentication response message from the wireless power receiver, and transmitting a read BLOB response packet including a portion ranging from the byte offset to the negotiated MTU within the authentication response message to the wireless power receiver. ### Claim 13 (depends on 10) The wireless power transmitter of claim 10, wherein, when the negotiated MTU is less than the size of the authentication-related message, the GATT-based authentication procedure includes receiving a WRITE REQUEST packet including an authentication request message from the wireless power receiver by the communication/control circuit and transmitting an authentication response message comprising a plurality of message fragments over a plurality of NOTIFICATION packets to the wireless power receiver, wherein one NOTIFICATION packet includes one message fragment. ### Claim 14 (depends on 13) The wireless power transmitter of claim 13, wherein a header for each of the plurality of message fragments includes a control field indicating the number of the plurality of message fragments or the number of the one message fragment. ### Claim 15 (depends on 9) The wireless power transmitter of claim 9, wherein the authentication request message includes one of GET_CERTIFICATE, GET_DIGESTS, and CHANLLENGE; and the authentication response message includes one of CERTIFICATE, DIGESTS, and CHALLENGE_AUTH. ### Claim 16 (depends on 15) The wireless power transmitter of claim 15, wherein the communication/control circuit includes an out-band communication module performing the out-band communication and an in-band communication module performing the in-band communication; and the authentication procedure is performed after handover from the in-band communication to the out-band communication is completed.