# US 2021/0242925 A1 · Uplink beam failure report for a default uplink beam > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0242925 A1 - Document ID: US20210242925A1 - Status: Published application - Kind: A1 - Application number: 17/098,264 - Filed: 2020-11-13 - Published: 2021-08-05 - Earliest claimed: 2020-01-31 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Tianyang BAI; Yan ZHOU; Tao LUO; Junyi LI - Web page: https://patentgrep.com/patent/US20210242925A1 ## CPC - H04B 7/088: {using beam selection} - H04B 7/06964: {Re-selection of one or more beams after beam failure} - H04W 52/365: {Power headroom reporting} - H04W 72/53: based on regulatory allocation policies - H04W 76/11: Allocation or use of connection identifiers - H04W 76/19: Connection re-establishment - H04W 16/28: using beam steering - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A user equipment (UE) determines a beam failure of a default uplink beam for the UE. The UE transmits an uplink beam failure report in response to determining the beam failure of the default uplink beam, the uplink beam failure report indicating that a reported beam is the default uplink beam for the UE. A base station receives an uplink beam failure report from the UE and determines that a reported beam is a default uplink beam for the UE. ## Claims ### Claim 1 A method of wireless communication at a user equipment (UE), comprising: determining a beam failure of a default uplink beam for the UE; and transmitting an uplink beam failure report in response to determining the beam failure of the default uplink beam, the uplink beam failure report indicating that a reported beam is the default uplink beam for the UE. ### Claim 2 (depends on 1) The method of claim 1, further comprising: indicating that the reported beam is the default uplink beam by an absence of an uplink beam indication identifier (ID) in the uplink beam failure report. ### Claim 3 (depends on 1) The method of claim 1, further comprising: including, in the uplink beam failure report, an uplink beam indication identifier (ID) that indicates the default uplink beam. ### Claim 4 (depends on 3) The method of claim 3, wherein the uplink beam indication ID comprises an ID reserved for the default uplink beam. ### Claim 5 (depends on 3) The method of claim 3, wherein the uplink beam indication ID comprises an ID other than a configured ID for spatial relation information or an uplink transmission configuration indication (TCI) state for the UE. ### Claim 6 (depends on 3) The method of claim 3, wherein the uplink beam indication ID comprises a set of bits corresponding to the default uplink beam. ### Claim 7 (depends on 3) The method of claim 3, wherein a failed beam is identified by an uplink beam indication reference signal (RS) ID, wherein a control resource set (CORESET) is configured for the UE on a component carrier, and wherein the uplink beam indication ID indicates the default uplink beam based on an RS ID for receiving the CORESET having a lowest ID in an active downlink bandwidth part for the component carrier. ### Claim 8 (depends on 3) The method of claim 3, wherein a failed beam is identified by an uplink beam indication reference signal (RS) ID, wherein a control resource set (CORESET) is not configured for the UE on a component carrier, and wherein the uplink beam indication ID indicates the default uplink beam based on an RS ID in an active physical downlink shared channel (PDSCH) transmission configuration indication (TCI) state having a lowest ID in an active downlink bandwidth part for the component carrier. ### Claim 9 (depends on 3) The method of claim 3, wherein the uplink beam indication ID indicates the default uplink beam based on a control resource set (CORESET) having a lowest ID. ### Claim 10 (depends on 3) The method of claim 3, wherein the uplink beam indication ID indicates the default uplink beam based on an active physical downlink shared channel (PDSCH) transmission configuration indication (TCI) state having a lowest ID. ### Claim 11 (depends on 1) The method of claim 1, further comprising: determining the default uplink beam for an uplink channel comprising a physical uplink control channel (PUCCH), a sounding reference signal (SRS), or a physical uplink shared channel (PUSCH) when spatial relation information or UL TCI state ID is not configured for the uplink channel. ### Claim 12 (depends on 11) The method of claim 11, wherein when at least one control resource set (CORESET) is configured on a component carrier, the UE determines the default uplink beam based on a beam for receiving a CORESET with a lowest ID, and when at least one CORESET is not configured on the component carrier, the UE determines the default uplink beam based on an active physical downlink shared channel (PDSCH) transmission configuration indication (TCI) state having the lowest ID. ### Claim 13 An apparatus for wireless communication at a user equipment (UE), comprising: a memory; and at least one processor coupled to the memory and configured to: determine a beam failure of a default uplink beam for the UE; and transmit an uplink beam failure report in response to determining the beam failure of the default uplink beam, the uplink beam failure report indicating that a reported beam is the default uplink beam for the UE. ### Claim 14 (depends on 13) The apparatus of claim 13, wherein the at least one processor is configured to indicate that the reported beam is the default uplink beam by an absence of an uplink beam indication identifier (ID) in the uplink beam failure report. ### Claim 15 (depends on 13) The apparatus of claim 13, wherein the at least one processor is configured to include, in the uplink beam failure report, an uplink beam indication identifier (ID) that indicates the default uplink beam. ### Claim 16 A method of wireless communication at base station, comprising: receiving an uplink beam failure report from a user equipment (UE); and determining that a reported beam is a default uplink beam for the UE. ### Claim 17 (depends on 16) The method of claim 16, wherein the base station determines that the reported beam is the default uplink beam based on an absence of an uplink beam indication identifier (ID) in the uplink beam failure report. ### Claim 18 (depends on 16) The method of claim 16, wherein the uplink beam failure report includes an uplink beam indication identifier (ID) that indicates the default uplink beam, and wherein the base station determines that the reported beam is the default uplink beam based on the uplink beam indication ID. ### Claim 19 (depends on 18) The method of claim 18, wherein the uplink beam indication ID comprises an ID reserved for the default uplink beam. ### Claim 20 (depends on 18) The method of claim 18, wherein the uplink beam indication ID comprises an ID other than a configured ID for spatial relation information or an uplink transmission configuration indication (TCI) state for the UE. ### Claim 21 (depends on 18) The method of claim 18, wherein the uplink beam indication ID comprises a set of bits corresponding to the default uplink beam. ### Claim 22 (depends on 18) The method of claim 18, wherein a failed beam is identified by an uplink beam indication reference signal (RS) ID, wherein a control resource set (CORESET) is configured for the UE on a component carrier, and wherein the uplink beam indication ID indicates the default uplink beam based on an RS ID for receiving the CORESET having a lowest ID in an active downlink bandwidth part for the component carrier. ### Claim 23 (depends on 18) The method of claim 18, wherein a failed beam is identified by an uplink beam indication reference signal (RS) ID, wherein a control resource set (CORESET) is not configured for the UE on a component carrier, and wherein the uplink beam indication ID indicates the default uplink beam based on an RS ID in an active physical downlink shared channel (PDSCH) transmission configuration indication (TCI) state having a lowest ID in an active downlink bandwidth part for the component carrier. ### Claim 24 (depends on 18) The method of claim 18, wherein the uplink beam indication ID indicates the default uplink beam based on a control resource set (CORESET) having a lowest ID. ### Claim 25 (depends on 18) The method of claim 18, wherein the uplink beam indication ID indicates the default uplink beam based on an active physical downlink shared channel (PDSCH) transmission configuration indication (TCI) state having a lowest ID. ### Claim 26 (depends on 16) The method of claim 16, wherein the default uplink beam is determined for an uplink channel comprising a physical uplink control channel (PUCCH), a sounding reference signal (SRS), or a physical uplink shared channel (PUSCH) when spatial relation information or UL TCI state ID is not configured for the uplink channel. ### Claim 27 (depends on 26) The method of claim 26, wherein when at least one control resource set (CORESET) is configured on a component carrier for the UE, the default uplink beam is based on a beam for receiving a CORESET with a lowest ID, and when at least one CORESET is not configured on the component carrier for the UE, the default uplink beam is based on an active physical downlink shared channel (PDSCH) transmission configuration indication (TCI) state having the lowest ID. ### Claim 28 (depends on 16) The method of claim 16, further comprising at least one of: transmitting a response to the beam failure report for the default uplink beam; or receiving an uplink transmission on a new uplink beam in response to determining that the reported beam is the default uplink beam for the UE. ### Claim 29 An apparatus for wireless communication at a base station, comprising: a memory; and at least one processor coupled to the memory and configured to: receive an uplink beam failure report from a user equipment (UE); and determine that a reported beam is a default uplink beam for the UE. ### Claim 30 (depends on 29) The apparatus of claim 29, wherein the at least one processor is configured to determine that the reported beam is the default uplink beam based on an uplink beam indication ID included in the uplink beam failure report.