# US 11,906,643 B2 · Optimizing transmission of a sidelink synchronization signal by a wireless device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,906,643 B2 - Document ID: US11906643B2 - Status: Granted - Kind: B2 - Application number: 17/644,042 - Filed: 2021-12-13 - Published: 2023-06-15 - Granted: 2024-02-20 - Earliest claimed: 2021-12-13 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Mohammed Ataur Rahman Shuman; Soumya Das; Mohammad Nekoui - Web page: https://patentgrep.com/patent/US11906643B2 ## CPC - G01S 5/0036: {of measured values, i.e. measurement on mobile and position calculation on base station} - H04W 56/0015: {one node acting as a reference for the others} - G01S 19/51: Relative positioning - H04W 4/021: Services related to particular areas, e.g. point of interest [POI] services, venue services or geofences - H04W 4/46: for vehicle-to-vehicle communication [V2V] - H04W 56/006: {using known positions of transmitter and receiver} - H04W 64/006: {with additional information processing, e.g. for direction or speed determination} - H04W 92/18: between terminal devices - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Disclosed are techniques for performing wireless communication. In some aspects, a wireless communication device may determine that a prospective position of the wireless communication device is in a geographic area associated with a deficient global navigation satellite system (GNSS) signal. In some cases, the wireless communications device can transmit a sidelink synchronization signal to at least one user equipment (UE) device that is located within the geographic area associated with the deficient GNSS signal. ## Claims ### Claim 1 A method for wireless communications, comprising: determining that a prospective position of a user equipment (UE) device is in a geographic area associated with a deficient synchronization source signal; transmitting a sidelink synchronization signal to at least one other UE device that is located within the geographic area associated with the deficient synchronization source signal; and discontinuing transmission of the sidelink synchronization signal in response to determining that the at least one other UE device has exited the geographic area. ### Claim 2 (depends on 1) The method of claim 1, wherein the geographic area associated with the deficient synchronization source signal includes geographic area associated with a deficient global navigation satellite system (GNSS) signal and a deficient base station signal. ### Claim 3 (depends on 1) The method of claim 1, further comprising: associating with the at least one other UE device to form a UE platoon; and identifying the UE device as a sidelink synchronization source for the UE platoon based on a position of the UE device relative to the at least one other UE device, wherein the sidelink synchronization source is configured to transmit a sidelink synchronization signal while at least a portion of the UE platoon is in the geographic area. ### Claim 4 (depends on 3) The method of claim 3, wherein the position of the UE device is behind the at least one other UE device. ### Claim 5 (depends on 3) The method of claim 3, wherein associating with the at least one other UE device to form the UE platoon is based on at least one of a UE direction of travel, a UE lane position, a UE speed, a UE capability, and a UE locality. ### Claim 6 (depends on 1) The method of claim 1, further comprising: receiving, from a base station, an indication of the geographic area associated with the deficient synchronization source signal. ### Claim 7 (depends on 1) The method of claim 1, wherein determining that the prospective position of the UE device is in the geographic area further comprises: receiving, from a base station, an indication that a current position of the UE device is within a threshold distance of the geographic area. ### Claim 8 (depends on 7) The method of claim 7, wherein the indication includes a request to transmit the sidelink synchronization signal. ### Claim 9 (depends on 1) The method of claim 1, further comprising: determining that a current position of the UE device is within a threshold distance of the geographic area for transmission of the sidelink synchronization signal. ### Claim 10 (depends on 1) The method of claim 1, further comprising: identifying the geographic area using a machine learning image classification algorithm. ### Claim 11 (depends on 1) The method of claim 1, further comprising: identifying the geographic area using GNSS signal quality data received from a plurality of UE devices. ### Claim 12 A wireless communication device for wireless communications, comprising: at least one memory; and at least one processor coupled to the at least one memory and configured to: determine that a prospective position of the wireless communication device is in a geographic area associated with a deficient synchronization source signal; transmit a sidelink synchronization signal to at least one user equipment (UE) device that is located within the geographic area associated with the deficient synchronization source signal; and discontinue transmission of the sidelink synchronization signal in response to determining that the at least one other UE device has exited the geographic area. ### Claim 13 (depends on 12) The wireless communication device of claim 12, wherein the geographic area associated with the deficient synchronization source signal includes geographic area associated with a deficient global navigation satellite system (GNSS) signal and a deficient base station signal. ### Claim 14 (depends on 12) The wireless communication device of claim 12, wherein the at least one processor is further configured to: associate with the at least one UE device to form a UE platoon; and identify the wireless communication device as a sidelink synchronization source for the UE platoon based on a position of the wireless communication device relative to the at least one UE device, wherein the sidelink synchronization source is configured to transmit a sidelink synchronization signal while at least a portion of the UE platoon is in the geographic area. ### Claim 15 (depends on 14) The wireless communication device of claim 14, wherein associating with the at least one UE device to form the UE platoon is based on at least one of a UE direction of travel, a UE lane position, a UE speed, a UE capability, and a UE locality. ### Claim 16 (depends on 12) The wireless communication device of claim 12, wherein the at least one processor is further configured to: receive, from a base station, an indication of the geographic area associated with the deficient synchronization source signal. ### Claim 17 (depends on 12) The wireless communication device of claim 12, wherein to determine that the prospective position of the wireless communication device is in the geographic area the at least one processor is further configured to: receive, from a base station, an indication that a current position of the wireless communication device is within a threshold distance of the geographic area, wherein the indication includes a request to transmit the sidelink synchronization signal. ### Claim 18 (depends on 12) The wireless communication device of claim 12, wherein the at least one processor is further configured to: determine that a current position of the wireless communication device is within a threshold distance of the geographic area for transmission of the sidelink synchronization signal. ### Claim 19 A method of wireless communications, comprising: receiving, by a user equipment (UE) device, a request to associate with at least one other UE device to form a UE platoon; identifying the UE device as a sidelink synchronization source for the UE platoon based on a position of the UE device relative to the at least one other UE device; transmitting a first sidelink synchronization signal while at least a portion of the UE platoon is in a geographic area associated with a deficient synchronization source signal; and discontinuing transmission of the first sidelink synchronization signal in response to determining that the at least one other UE device has exited the geographic area. ### Claim 20 (depends on 19) The method of claim 19, wherein the geographic area associated with the deficient synchronization source signal includes geographic area associated with a deficient global navigation satellite system (GNSS) signal and a deficient base station signal. ### Claim 21 (depends on 19) The method of claim 19, further comprising: receiving a second sidelink synchronization signal from the at least one other UE device. ### Claim 22 (depends on 19) The method of claim 19, further comprising: receiving an indication of the geographic area from the at least one other UE device. ### Claim 23 (depends on 19) The method of claim 19, wherein the position of the UE device is behind the at least one other UE device. ### Claim 24 A wireless communication device for wireless communications, comprising: at least one memory; and at least one processor coupled to the at least one memory and configured to: receive a request to associate with at least one UE device to form a UE platoon; identify the wireless communication device as a sidelink synchronization source for the UE platoon based on a position of the wireless communication device relative to the at least one UE device; transmit a first sidelink synchronization signal while at least a portion of the UE platoon is in a geographic area associated with a deficient synchronization source signal; and discontinue transmission of the first sidelink synchronization signal in response to determining that the at least one UE device has exited the geographic area. ### Claim 25 (depends on 24) The wireless communication device of claim 24, wherein the geographic area associated with the deficient synchronization source signal includes geographic area associated with a deficient global navigation satellite system (GNSS) signal and a deficient base station signal. ### Claim 26 (depends on 24) The wireless communication device of claim 24, wherein the at least one processor is further configured to: receive a second sidelink synchronization signal from the at least one UE device. ### Claim 27 (depends on 24) The wireless communication device of claim 24, wherein the at least one processor is further configured to: receive an indication of the geographic area from the at least one UE device. ### Claim 28 (depends on 24) The wireless communication device of claim 24, wherein the position of the wireless communication device is behind the at least one UE device.