# US 2020/0396017 A1 · Transmission rate switching method, bluetooth device, and computer-readable medium > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0396017 A1 - Document ID: US20200396017A1 - Status: Published application - Kind: A1 - Application number: 17/008,848 - Filed: 2020-09-01 - Published: 2020-12-17 - Earliest claimed: 2018-03-08 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Huazhang Liu - Web page: https://patentgrep.com/patent/US20200396017A1 ## CPC - H04L 1/0002: {by adapting the transmission rate} - H04L 1/0015: {characterised by the adaptation strategy} - H04W 4/80: Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication - H04W 28/02: Traffic management, e.g. flow control or congestion control - H04W 28/0231: {based on communication conditions (dynamic wireless traffic scheduling definition based on channel quality criteria H04W72/54)} - H04L 1/0018: {based on latency requirement} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method, a Bluetooth device, and a computer-readable medium provides transmission rate switching applied to a first device that communicates with a second device through a Bluetooth physical channel. The method includes: determining a link quality of the Bluetooth physical channel; determining based on a preset correspondence between link quality and a transmission rate, target transmission rates corresponding to the link quality, the target transmission rates including a first sending rate and a second sending rate; setting a rate of sending information to the second device through the Bluetooth physical channel to the first sending rate; and sending first control information to the second device, the first control information indicating to indicate the second device to set a rate of sending information to the first device through the Bluetooth physical channel to the second sending rate. This can quickly complete transmission rate switching, and reduce signaling overheads. ## Claims ### Claim 1 A transmission rate switching method applied to a first device that communicates with a second device through a Bluetooth physical channel, the method comprising: determining, by the first device, a link quality of the Bluetooth physical channel: determining, by the first device, based on a preset correspondence between the link quality and a transmission rate, target transmission rates corresponding to the link quality, the target transmission rates including a first sending rate and a second sending rate; setting, by the first device, a rate of sending information to the second device through the Bluetooth physical channel to the first sending rate; and sending, by the first device, first control information to the second device, the first control information indicating to the second device to set a rate of sending information to the first device through the Bluetooth physical channel to the second sending rate. ### Claim 2 (depends on 1) The transmission rate switching method according to claim 1, wherein the determining of the target transmission rates is performed after determining that a variation of the link quality of the Bluetooth physical channel within a reference duration exceeds a quality threshold. ### Claim 3 (depends on 1) The transmission rate switching method according to claim 1, wherein the first control information comprises a frit field, a second field, and a third field, the first field indicating the first sending rate, the second field indicating the second sending rate, and the third field indicating a target time point, and wherein the setting, by the first device, of the rate of sending information to the second device is performed after the target time point is reached. ### Claim 4 (depends on 1) The transmission rate switching method according to claim 1, wherein the first control information comprises a first field, a second field, and a third field, the first field indicating the first sending rate, the second field indicating the second sending rate, and the third field indicating a target duration, wherein after the sending, by the first device, of the first control information to the second device, the method further comprises starting a timing after receiving acknowledgment information from the second device, the acknowledgment information indicating that the second device received the first control information and wherein the setting, by the first device, of the rate of sending information to the second device is performed after the timing reaches the target duration. ### Claim 5 (depends on 4) The transmission rate switching method according to claim 4, wherein after the starting of the timing, the method further comprises stopping of the timing with the first device receiving rejection information before the target duration is reached, the rejection information indicating that the second device rejected the first control information. ### Claim 6 (depends on 3) The transmission rate switching method according to claim 3, wherein the first control information further comprises a fourth field, and/or a fifth field, the fourth field indicating a link corresponding to the link quality, and the, fifth field indicating an available channel between the first device and the second device. ### Claim 7 (depends on 1) The transmission rate switching method according to claim 1, further comprising: receiving second control information sent by the second device, the second control information indicating to the first device to switch the rate of sending information to the second device through the Bluetooth physical channel; and rejecting the second control information when a time interval between a first time point and a second time point is less than a time threshold, the first time point being a time point at which the first device sends the first control information, and the second time point being a time point at which the first device receives the second control information. ### Claim 8 A transmission rate switching method applied to a second device that communicates with a first device through a Bluetooth physical channel, the method comprising: receiving, by the second device, control information sent by the first device; and switching, by the second device, from a current sending rate to a sending rate for the second device that is indicated by the control information, the sending rate corresponding to a link quality of the Bluetooth physical channel, and the sending rate being determined by the first device based on a preset correspondence between a link quality and a transmission rate. ### Claim 9 (depends on 8) The transmission rate switching method according to claim 8, further comprising: determining to reject the control information; and sending rejection information to the first device, the rejection information indicating that the second device rejected the control information. ### Claim 10 (depends on 8) The transmission rate switching method according to claim 8, further comprising: sending acknowledgment information to the first device, the acknowledgment information indicating that the second device received the control information. ### Claim 11 (depends on 8) The transmission rate switching method according to claim 8, wherein the control information comprises a first field, a second field, and a third field, the first field indicating a to-be-used sending rate of the first device, the second field indicating a to-be-used sending rate of the second device, and the third field indicating a target time point, and wherein the switching, by the second device, is performed after the target time point is reached, by switching from the current sending rate to the sending rate indicated by the second field. ### Claim 12 (depends on 10) The transmission rate switching method according to claim 10, wherein the control information comprises a first field, a second field, and a third field, the first field indicating a to-be-used sending rate of the first device, the second field indicating a to-be-used sending rate of the second device, and the third field indicating a target duration, wherein after the sending acknowledgment information to the first device, the method further comprises starting a timing, and wherein the switching, by the second device, is performed after the timing reaches the target duration by switching from the current sending rate to the sending rate indicated by the second field. ### Claim 13 (depends on 12) The transmission rate switching method according to claim 12, further comprising: parsing the control information; determining to reject the control information; and stopping the timing. ### Claim 14 A Bluetooth device, being a first device that communicates with a second device through a Bluetooth physical channel, the Bluetooth device comprising, a baseband controller and a radio transceiver, wherein the baseband controller is configured to determine a link quality of the Bluetooth physical channel; and determine, based on a preset correspondence between the link quality and a transmission rate, target transmission rates corresponding to the link quality, the target transmission rates including a first sending rate and a second sending rate, and wherein the radio transceiver is configured to: set a rate of sending information to the second device through the Bluetooth physical channel to the first sending rate; and send first control information to the second device, the first control information indicating to the, second device to set a rate of sending information to the first device through the Bluetooth physical channel to the second sending rate. ### Claim 15 (depends on 14) The Bluetooth device according to claim 14, wherein the determining, by the baseband controller, of the target transmission rates is performed after determining that a variation of the link quality of the Bluetooth physical channel within a reference duration exceeds a quality threshold. ### Claim 16 (depends on 14) The Bluetooth device according to claim 14, wherein the first control information comprises a first field, a second field, and a third field, the first field indicating the first sending rate, the second field indicating the second sending rate, and the third field indicating a target time point, and wherein the radio transceiver sets the rate of sending information to the second device by setting the current sending rate to the lint sending rate after the target time point is reached. ### Claim 17 (depends on 14) The Bluetooth device according to claim 14, wherein the first control information comprises a first field, a second field, and a third field, the first field indicating the first sending rate, the second field indicating the second sending rate, and the third field indicating a target duration, wherein the radio transceiver is further configured to receive acknowledgment information from the second device, the acknowledgment information indicating that the second device received the first control information, wherein the Bluetooth device further comprises a timer configured to start a timing after the radio transceiver receives the acknowledgment information, and Wherein the radio transceiver sets the rate of sending information to the second device by setting a current sending rate to the first sending rate after the timing reaches the target duration. ### Claim 18 (depends on 17) The Bluetooth device according to claim 17, wherein the radio transceiver is further configured to receive rejection information, the rejection information indicating that the second device rejected the first control information, and wherein the tinier is controlled to stop the timing with the radio transceiver receiving the rejection information before the target duration is reached. ### Claim 19 A Bluetooth device, being a second device that communicates with a first device through a Bluetooth physical channel, the Bluetooth device comprising a radio transceiver configured to: receive control information sent by the first device; and switch from a current sending rate to a sending rate for the second device that is indicated by the control information, the sending rate corresponding to a link quality of the Bluetooth physical channel that is determined by the first device based on a preset correspondence between the link quality and a transmission rate. ### Claim 20 (depends on 19) The Bluetooth device according to claim 19, further comprising a processor configured to: determine to reject the control information; and send rejection information to the first device, the rejection information indicating that the second device rejected the control information.