# US 12,193,089 B2 · Link margin improvements using a variable physical layer symbol rate > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,193,089 B2 - Document ID: US12193089B2 - Status: Granted - Kind: B2 - Application number: 18/500,542 - Filed: 2023-11-02 - Published: 2024-05-09 - Granted: 2025-01-07 - Earliest claimed: 2022-11-09 - Assignees: Google Inc. - Applicants: Google LLC - Inventors: Li-Xuan Chuo; Qi Jiang; Daniel Barros; Sunil Kumar - Web page: https://patentgrep.com/patent/US12193089B2 ## CPC - H04R 1/1041: {Mechanical or electronic switches, or control elements (switches in general H01H)} - H04W 76/14: Direct-mode setup - H04R 5/033: Headphones for stereophonic communication {(details thereof, e.g. relating to batteries, cables or control elements H04R1/10)} - H04W 28/10: Flow control {between communication endpoints} - H04R 1/1016: {Earpieces of the intra-aural type} - H04R 2420/07: Applications of wireless loudspeakers or wireless microphones - H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Various arrangements are presented for increasing a link margin of a wireless audio link. A short-range wireless communication link having a first physical layer (PHY) symbol rate is established between an audio source device and an audio output device. An audio stream is transmitted using the communication link, which includes a connected isochronous stream (CIS) link. A number of packet retransmissions are detected on the CIS. Based on the detected number of packet retransmissions on the CIS, the first PHY symbol rate of the CIS can be altered to a second PHY symbol rate for transmitting the audio stream. ## Claims ### Claim 1 A method for using a short-range wireless communication link, the method comprising: transmitting, by a source wireless communication device, data using and asynchronous connection-oriented logical transport (ACL) link of the short-range wireless communication link; determining an amount of time that has elapsed since a high throughput event on the ACL of the short-range wireless communication link; based on determining the amount of time, decreasing a first physical layer (PHY) symbol rate of the ACL to a second PHY symbol rate, wherein a link margin between the source wireless communication device and a second wireless communication device is increased based on altering the first PHY symbol rate of the ACL to the second PHY symbol rate; and transmitting, by the source wireless communication device, data using the ACL and the second PHY symbol rate. ### Claim 2 (depends on 1) The method of claim 1, wherein the high throughput event is identified based on an amount of data to be transmitted. ### Claim 3 (depends on 1) The method of claim 1, wherein the high throughput event is identified based on a detected change in use of the ACL. ### Claim 4 (depends on 1) The method of claim 1, wherein determining the amount of time that has elapsed since the high throughput event further comprises determining whether the amount of time has met a defined event threshold. ### Claim 5 (depends on 1) The method of claim 1, wherein the first PHY symbol rate is two million symbols per second and the second PHY symbol rate is either one million symbols per second or is a coded PHY symbol rate. ### Claim 6 (depends on 1) The method of claim 1, further comprising: performing a pairing process between the source wireless communication device and the second wireless communication device to determine that PHY symbol rates are eligible to be altered without restarting the short-range wireless communication link. ### Claim 7 (depends on 1) The method of claim 1, wherein the source wireless communication device is an audio streaming device and an audio output device that receives the data using the ACL is a pair of true wireless earbuds. ### Claim 8 (depends on 1) The method of claim 1, wherein the short-range wireless communication link is a Bluetooth LE communication link and altering the first PHY symbol rate of the ACL link is performed without restarting the short-range wireless communication link. ### Claim 9 A wireless communication system, comprising: a source wireless communication device that communicates wirelessly using a short-range wireless communication link, the source wireless communication device is configured to: transmit data using and asynchronous connection-oriented logical transport (ACL) of the short-range wireless communication link; determine an amount of time that has elapsed since a high throughput event on the ACL of the short-range wireless communication link; based on determining the amount of time, decrease a first physical layer (PHY) symbol rate of the ACL to a second PHY symbol rate, wherein a link margin between the source wireless communication device and a second wireless communication device is increased based on altering the first PHY symbol rate of the ACL to the second PHY symbol rate; and transmit data using the ACL and the second PHY symbol rate. ### Claim 10 (depends on 9) The wireless communication system of claim 9, further comprising true wireless earbuds, wherein the source wireless communication device is a smartphone. ### Claim 11 (depends on 9) The wireless communication system of claim 9, wherein the high throughput event is identified based on an amount of data to be transmitted. ### Claim 12 (depends on 9) The wireless communication system of claim 9, wherein the high throughput event is identified based on a detected change in use of the ACL. ### Claim 13 (depends on 9) The wireless communication system of claim 9, wherein the source wireless communication device being configured to determine the amount of time that has elapsed since the high throughput event further comprises the source wireless communication device being configured to determine whether the amount of time has met a defined event threshold. ### Claim 14 (depends on 9) The wireless communication system of claim 9, wherein the first PHY symbol rate is two million symbols per second and the second PHY symbol rate is either one million symbols per second or is a coded PHY symbol rate. ### Claim 15 (depends on 9) The wireless communication system of claim 9, wherein altering the first PHY symbol rate of the ACL is performed without restarting the short-range wireless communication link. ### Claim 16 (depends on 9) The wireless communication system of claim 9, wherein the short-range wireless communication link is a Bluetooth LE communication link. ### Claim 17 (depends on 16) The wireless communication system of claim 16, wherein the source wireless communication device is further configured to: perform a pairing process with the second wireless communication device to determine that PHY symbol rates are eligible to be altered without restarting the short-range wireless communication link. ### Claim 18 A wireless communication device, comprising: a wireless communication interface that communicates wirelessly using a short-range wireless communication link; and a processing system comprising one or more processors in communication with the wireless communication interface, wherein the processing system is configured to: transmit data using and asynchronous connection-oriented logical transport (ACL) of the short-range wireless communication link; determine an amount of time that has elapsed since a high throughput event on the ACL of the short-range wireless communication link; based on determining the amount of time, decrease a PHY symbol rate of the ACL to a second PHY symbol rate, wherein a link margin between the wireless communication device and a second wireless communication device is increased based on altering the PHY symbol rate of the ACL to the second PHY symbol rate; and transmit data using the ACL and the second PHY symbol rate. ### Claim 19 (depends on 18) The wireless communication device of claim 18, wherein the short-range wireless communication link is a Bluetooth LE communication link.