# US 2021/0243768 A1 · Ue autonomous beam selection > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0243768 A1 - Document ID: US20210243768A1 - Status: Published application - Kind: A1 - Application number: 16/779,283 - Filed: 2020-01-31 - Published: 2021-08-05 - Earliest claimed: 2020-01-31 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Sejoe Thomas; Abhijeet Prasad; Neelakanta Venkata Seshachalam Chimmapudi; Alvin Siu-Chung Ng - Web page: https://patentgrep.com/patent/US20210243768A1 ## CPC - H04W 48/16: Discovering, processing access restriction or access information - H04W 72/542: using measured or perceived quality - H04B 7/082: {selecting best antenna path} - H04B 7/088: {using beam selection} - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 52/0245: {according to signal strength} - H04W 52/226: {using past references to control power, e.g. look-up-table} - H04W 52/265: {taking into account the quality of service QoS} - H04W 72/046: {the resource being in the space domain, e.g. beams} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION ## Abstract Wireless communication techniques that include autonomous beam selection performed by a mobile device are discussed. A mobile device may receive a first SSB on a current-serving reception beam and receive other SSBs on different reception beams. The mobile device may autonomously switch beams during communication without instruction from another device. A UE can adjust from one beam to another while performing wireless communication using a current-serving reception beam to performing wireless communication using a second reception beam. A switch can occur upon determining that the quality of wireless communication performed using the second reception beam on which a second SSB was received is higher than the quality of wireless communication performed using the current-serving reception beam on which the first SSB was received. Other features are also described. ## Claims ### Claim 1 A method of wireless communication, comprising: receiving, by a user equipment (UE), an instruction to monitor at least one channel state information reference signal (CSI-RS); identifying, by the UE, a current-serving reception beam based, at least in part, on the at least one CSI-RS; receiving, by the UE, a first synchronization signal block (SSB) on the current-serving reception beam; receiving, by the UE, one or more SSBs on one or more reception beams, wherein the one or more SSBs are received on different ones of the one or more reception beams; determining, by the UE, that a quality of wireless communication performed using a second reception beam on which a second SSB was received is higher than a quality of wireless communication performed using the CSI-RS-identified current-serving reception beam on which the first SSB was received based on first and second metrics measured from the first and second SSBs, respectively, despite the instruction to monitor the at least one CSI-RS, wherein the second SSB is one of the one or more SSBs; and switching, by the UE, from performing wireless communication using the current-serving reception beam to performing wireless communication using the second reception beam based on the SSB-based determination that the quality of wireless communication performed using the second reception beam is higher than the quality of wireless communication performed using the CSI-RS-identified current-serving reception beam. ### Claim 2 (depends on 1) The method of claim 1, wherein the quality of wireless communication performed using the current-serving reception beam is indicated by a first reference signal reference power (RSRP) measurement of the first SSB and the quality of wireless communication performed using the second reception beam is indicated by a second RSRP measurement of the second SSB, and wherein determining that the quality of wireless communication performed using the second reception beam is higher than the quality of wireless communication performed using the current-serving reception beam comprises determining that the second RSRP is higher than the first RSRP by a threshold. ### Claim 3 (canceled) ### Claim 4 (depends on 1) The method of claim 1, further comprising: transmitting information using a contention-based random access channel (RACH) process and a transmission beam with the same directivity pattern as the second reception beam after switching from performing wireless communication using the current-serving reception beam to performing wireless communication using the second reception beam. ### Claim 5 (depends on 1) The method of claim 1, wherein the determination that the quality of wireless communication performed using the second reception beam is higher than the quality of wireless communication performed using the current-serving reception beam is made before a beam failure recovery procedure is initiated for the current-serving reception beam. ### Claim 6 An apparatus configured for wireless communication, comprising: means for receiving an instruction to monitor at least one channel state information reference signal (CSI-RS); means for identifying a current-serving reception beam based, at least in part, on the at least one CSI-RS; means for receiving a first synchronization signal block (SSB) on the current-serving reception beam; means for receiving one or more SSBs on one or more reception beams, wherein the one or more SSBs are received on different ones of the one or more reception beams; means for determining that a quality of wireless communication performed using a second reception beam on which a second SSB was received is higher than a quality of wireless communication performed using the CSI-RS-identified current-serving reception beam on which the first SSB was received based on first and second metrics measured from the first and second SSBs, respectively, despite the instruction to monitor the at least one CSI-RS, wherein the second SSB is one of the one or more SSBs; and means for switching from performing wireless communication using the current-serving reception beam to performing wireless communication using the second reception beam based on the SSB-based determination that the quality of wireless communication performed using the second reception beam is higher than the quality of wireless communication performed using the CSI-RS-identified current-serving reception beam. ### Claim 7 (depends on 6) The apparatus of claim 6, wherein the quality of wireless communication performed using the current-serving reception beam is indicated by a first reference signal reference power (RSRP) measurement of the first SSB and the quality of wireless communication performed using the second reception beam is indicated by a second RSRP measurement of the second SSB, and wherein the means for determining that the quality of wireless communication performed using the second reception beam is higher than the quality of wireless communication performed using the current-serving reception beam comprises means for determining that the second RSRP is higher than the first RSRP by a threshold. ### Claim 8 (canceled) ### Claim 9 (depends on 6) The apparatus of claim 6, further comprising: means for transmitting information using a contention-based random access channel (RACH) process and a transmission beam with the same directivity pattern as the second reception beam after switching from performing wireless communication using the current-serving reception beam to performing wireless communication using the second reception beam. ### Claim 10 (depends on 6) The apparatus of claim 6, further comprising means for determining that the quality of wireless communication performed using the second reception beam is higher than the quality of wireless communication performed using the current-serving reception beam before a beam failure recovery procedure is initiated for the current-serving reception beam. ### Claim 11 A non-transitory computer-readable medium having program code recorded thereon, the program code comprising: program code executable by a computer for causing the computer to receive an instruction to monitor at least one channel state information reference signal (CSI-RS); program code executable by the computer for causing the computer to identify a current-serving reception beam based, at least in part, on the at least one CSI-RS; program code executable by the computer for causing the computer to receive a first synchronization signal block (SSB) on the current-serving reception beam; program code executable by the computer for causing the computer to receive one or more SSBs on one or more reception beams, wherein the one or more SSBs are received on different ones of the one or more reception beams; program code executable by the computer for causing the computer to determine that a quality of wireless communication performed using a second reception beam on which a second SSB was received is higher than a quality of wireless communication performed using the CSI-RS-identified current-serving reception beam on which the first SSB was received based on first and second metrics measured from the first and second SSBs, respectively, despite the instruction to monitor the at least one CSI-RS, wherein the second SSB is one of the one or more SSBs; and program code executable by the computer for causing the computer to switch from performing wireless communication using the current-serving reception beam to performing wireless communication using the second reception beam based on the SSB-based determination that the quality of wireless communication performed using the second reception beam is higher than the quality of wireless communication performed using the CSI-RS-identified current-serving reception beam. ### Claim 12 (depends on 11) The non-transitory computer-readable medium of claim 11, wherein the quality of wireless communication performed using the current-serving reception beam is indicated by a first reference signal reference power (RSRP) measurement of the first SSB and the quality of wireless communication performed using the second reception beam is indicated by a second RSRP measurement of the second SSB, and wherein the program code executable by the computer for causing the computer to determine that the quality of wireless communication performed using the second reception beam is higher than the quality of wireless communication performed using the current-serving reception beam comprises program code executable by the computer for causing the computer to determine that the second RSRP is higher than the first RSRP by a threshold. ### Claim 13 (canceled) ### Claim 14 (depends on 11) The non-transitory computer-readable medium of claim 11, further comprising: program code executable by the computer for causing the computer to transmit information using a contention-based random access channel (RACH) process and a transmission beam with the same directivity pattern as the second reception beam after switching from performing wireless communication using the current-serving reception beam to performing wireless communication using the second reception beam. ### Claim 15 (depends on 11) The non-transitory computer-readable medium of claim 11, further comprising program code executable by the computer for causing the computer to determine that the quality of wireless communication performed using the second reception beam is higher than the quality of wireless communication performed using the current-serving reception beam before a beam failure recovery procedure is initiated for the current-serving reception beam. ### Claim 16 An apparatus configured for wireless communication, the apparatus comprising: at least one processor; and a memory coupled to the at least one processor, wherein the at least one processor is configured to: receive an instruction to monitor at least one channel state information reference signal (CSI-RS); identify a current-serving reception beam based, at least in part, on the at least one CSI-RS; receive a first synchronization signal block (SSB) on the current-serving reception beam; receive one or more SSBs on one or more reception beams, wherein the one or more SSBs are received on different ones of the one or more reception beams; determine that a quality of wireless communication performed using a second reception beam on which a second SSB was received is higher than a quality of wireless communication performed using the CSI-RS-identified current-serving reception beam on which the first SSB was received based on first and second metrics measured from the first and second SSBs, respectively, despite the instruction to monitor the at least one CSI-RS, wherein the second SSB is one of the one or more SSBs; and switch from performing wireless communication using the current-serving reception beam to performing wireless communication using the second reception beam based on the SSB-based determination that the quality of wireless communication performed using the second reception beam is higher than the quality of wireless communication performed using the CSI-RS-identified current-serving reception beam. ### Claim 17 (depends on 16) The apparatus of claim 16, wherein the quality of wireless communication performed using the current-serving reception beam is indicated by a first reference signal reference power (RSRP) measurement of the first SSB and the quality of wireless communication performed using the second reception beam is indicated by a second RSRP measurement of the second SSB, and wherein the at least one processor being configured to determine that the quality of wireless communication performed using the second reception beam is higher than the quality of wireless communication performed using the current-serving reception beam comprises the at least one processor being configured to determine that the second RSRP is higher than the first RSRP by a threshold. ### Claim 18 (canceled) ### Claim 19 (depends on 16) The apparatus of claim 16, wherein the at least one processor is further configured to transmit information using a contention-based random access channel (RACH) process and a transmission beam with the same directivity pattern as the second reception beam after switching from performing wireless communication using the current-serving reception beam to performing wireless communication using the second reception beam. ### Claim 20 (depends on 16) The apparatus of claim 16, wherein the at least one processor is further configured to determine that the quality of wireless communication performed using the second reception beam is higher than the quality of wireless communication performed using the current-serving reception beam before a beam failure recovery procedure is initiated for the current-serving reception beam.