# US 2021/0242726 A1 · Communication method and apparatus, power transmitting device, and power receiving device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0242726 A1 - Document ID: US20210242726A1 - Status: Published application - Kind: A1 - Application number: 17/261,451 - Filed: 2018-07-20 - Published: 2021-08-05 - Earliest claimed: 2018-07-20 - Assignees: Beijing Xiaomi Mobile Software Co., Ltd. - Applicants: Beijing Xiaomi Mobile Software Co., Ltd. - Inventors: Yang LIU - Web page: https://patentgrep.com/patent/US20210242726A1 ## CPC - H02J 50/402: {the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas} - 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 - H04W 4/06: Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services - H04W 52/00: Power management {, e.g. Transmission Power Control [TPC] or power classes} - H04W 4/80: Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication - 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 provides communication methods and apparatuses, a power transmitting device, a power receiving device, and computer readable storage mediums. The communication method includes: transmitting a broadcast signal when detecting a load change of the PTX, where the broadcast signal carries a communication mode supported by the PTX and a current load state; charging a first PRX after a handshake communication with the first PRX; receiving a communication state reported by the first PRX according to the broadcast signal; and communicating with the first PRX according to the communication state. In examples of the present disclosure, by transmitting a broadcast signal after detecting a load change, receiving a communication state reported by the first PRX according to the broadcast signal, and communicating with the first PRX according to the communication state, the PTX may communicate with the PRX without affecting the charging efficiency. ## Claims ### Claim 1 A communication method, applied to a power transmitter (PTX) supporting multiple coils, and comprising: transmitting a broadcast signal in response to detecting a load change of the PTX, wherein the broadcast signal carries a communication mode supported by the PTX and a current load state; charging a first power receiver (PRX) after a handshake communication with the first PRX; receiving a communication state reported by the first PRX according to the broadcast signal; and communicating with the first PRX according to the communication state. ### Claim 2 (depends on 1) The method according to claim 1, further comprising: charging a second PRX before the transmitting the broadcast signal in response to detecting the load change of the PTX. ### Claim 3 (depends on 2) The method according to claim 2, further comprising: retransmitting a broadcast signal in response to detecting that the second PRX has been removed; receiving a communication request transmitted by the first PRX according to the retransmitted broadcast signal, wherein the communication request is configured to request the PTX returning to an in-band enhanced communication state; and performing an in-band enhanced communication with the first PRX according to the communication request. ### Claim 4 (depends on 3) The method according to claim 3, further comprising: after performing the in-band enhanced communication with the first PRX according to the communication request, performing an out-of-band communication with a third PRX in response to detecting access by the third PRX supporting the out-of-band communication; transmitting, to the first PRX, instruction information configured to instruct reducing an in-band communication rate to a preset rate; and performing a low rate in-band communication with the first PRX at the preset rate. ### Claim 5 (depends on 1) The method according to claim 1, further comprising: agreeing on a low rate in-band communication mode with a PRX including the first PRX; the communicating with the first PRX according to the communication state, comprises: performing a low rate in-band communication with the first PRX in the low rate in-band communication mode according to a low rate communication state. ### Claim 6 (depends on 1) The method according to claim 1, wherein the transmitting a broadcast signal in response to detecting a load change of the PTX, comprises: transmitting the broadcast signal periodically at a fixed location in response to detecting the load change of the PTX. ### Claim 7 A communication method, applied to a power receiver (PRX), and comprising: receiving a broadcast signal transmitted by a power transmitter (PTX); receiving power from the PTX after a handshake communication with the PTX; reporting a communication state to the PTX in response to determining that there is other load accessing the PTX according to the broadcast signal; and communicating with the PTX according to the communication state. ### Claim 8 (depends on 7) The method according to claim 7, further comprising: receiving an updated broadcast signal transmitted by the PTX after communicating with the PTX according to a low rate communication state; transmitting a communication request to the PTX according to the updated broadcast signal, wherein the communication request is configured to request the PTX returning to an in-band enhanced communication state; and performing an in-band enhanced communication with the PTX. ### Claim 9 (depends on 8) The method according to claim 8, further comprising: receiving instruction information transmitted by the PTX after performing the in-band enhanced communication with the PTX, wherein the instruction information is configured to instruct reducing an in-band communication rate to a preset rate; and performing a low rate in-band communication with the PTX at the preset rate according to the instruction information. ### Claim 10 (depends on 7) The method according to claim 7, further comprising: agreeing on a low rate in-band communication mode with the PTX; the communicating with the PTX according to the communication state, comprises: performing a low rate in-band communication with the PTX in the low rate in-band communication mode according to a low rate communication state. ### Claim 11 (depends on 7) The method according to claim 7, wherein the receiving a broadcast signal transmitted by a PTX, comprises: detecting a broadcast signal at a fixed location in a current period; and receiving the broadcast signal when detecting the broadcast signal successfully. ### Claim at position 12 -22. (canceled) ### Claim 23 A power transmitting device, comprising: a processor; and a storage storing instructions executable by the processor; wherein the processor is configured to: transmit a broadcast signal in response to detecting a load change of a power transmitter (PTX), wherein the broadcast signal carries a communication mode supported by the PTX and a current load state; charge a first power receiver (PRX) after a handshake communication with the first PRX; receive a communication state reported by the first PRX according to the broadcast signal; and communicate with the first PRX according to the communication state. ### Claim 24 A power receiving device, comprising: a processor; and a storage storing instructions executable by the processor; wherein the processor is configured to: receive a broadcast signal transmitted by a power transmitter (PTX); receive power from the PTX after a handshake communication with the PTX; report a communication state to the PTX in response to determining that there is other load accessing the PTX according to the broadcast signal; and communicate with the PTX according to the communication state. ### Claim 25 (canceled) ### Claim 26 (canceled) ### Claim 27 (depends on 23) The power transmitting device according to claim 23, wherein the processor is further configured to: charge a second PRX before transmitting the broadcast signal in response to detecting the load change of the PTX. ### Claim 28 (depends on 27) The power transmitting device according to claim 27, wherein the processor is further configured to: retransmit a broadcast signal in response to detecting that the second PRX has been removed; receive a communication request transmitted by the first PRX according to the retransmitted broadcast signal, wherein the communication request is configured to request the PTX returning to an in-band enhanced communication state; and perform an in-band enhanced communication with the first PRX according to the communication request. ### Claim 29 (depends on 28) The power transmitting device according to claim 28, wherein the processor is further configured to: after performing the in-band enhanced communication with the first PRX according to the communication request, perform an out-of-band communication with a third PRX in response to detecting access by the third PRX supporting the out-of-band communication; transmit, to the first PRX, instruction information configured to instruct reducing an in-band communication rate to a preset rate; and perform a low rate in-band communication with the first PRX at the preset rate. ### Claim 30 (depends on 23) The power transmitting device according to claim 23, wherein the processor is further configured to: agree on a low rate in-band communication mode with a PRX including the first PRX; and perform a low rate in-band communication with the first PRX in the low rate in-band communication mode according to a low rate communication state. ### Claim 31 (depends on 23) The power transmitting device according to claim 23, wherein the processor is further configured to: transmit the broadcast signal periodically at a fixed location in response to detecting the load change of the PTX.