# US 12,113,599 B2 · Apparatus and method for beam failure recovery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,113,599 B2 - Document ID: US12113599B2 - Status: Granted - Kind: B2 - Application number: 17/524,621 - Filed: 2021-11-11 - Published: 2022-06-23 - Granted: 2024-10-08 - Earliest claimed: 2019-08-13 - Assignees: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Applicants: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Inventors: Li Guo - Web page: https://patentgrep.com/patent/US12113599B2 ## CPC - H04B 7/06964: {Re-selection of one or more beams after beam failure} - H04L 5/0023: {Time-frequency-space} - H04B 7/022: Site diversity; Macro-diversity (using two or more spaced independent antennas H04B7/04) - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 27/2613: {Structure of the reference signals} - H04W 72/046: {the resource being in the space domain, e.g. beams} - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04W 76/19: Connection re-establishment - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 27/26025: {Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking (allocating sub-channels of the transmission path H04L5/003)} - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04B: TRANSMISSION - 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 An apparatus and a method for beam failure recovery are provided. The apparatus, such as a user equipment device, detects a first set of beam failure detection reference signals (RSs) associated with a first control resource set (CORESET) group identifier (ID), and measures the first set of beam failure detection RSs to detect a first beam failure event associated with the first CORESET group ID. The apparatus transmits a first beam failure recovery request message associated with the first CORESET group ID upon detecting the first beam failure event, and monitors a search space for a first beam failure recovery response responding to the first beam failure recovery request. ## Claims ### Claim 1 A method for beam failure recovery executable by an apparatus, comprising: detecting a first set of beam failure detection reference signals (RSs) associated with a first control resource set (CORESET) group identifier (ID); measuring the first set of beam failure detection RSs to detect a first beam failure event associated with the first CORESET group ID; transmitting a first beam failure recovery request message associated with the first CORESET group ID when the first beam failure event is detected; and monitoring a search space for a first beam failure recovery response which responds to the first beam failure recovery request, wherein the method further comprises: selecting a first set of new beam identification RSs associated with the first CORESET group ID, of which link quality is measured as greater than a first threshold; and transmitting a random access channel (RACH) preamble associated with the first set of new beam identification RSs for a beam failure recovery process associated with the first CORESET group ID, wherein the RACH preamble comprises the first beam failure recovery request. ### Claim 2 (depends on 1) The method of claim 1, further comprising: using a first default transmit beam for physical uplink control channel (PUCCH) resources associated with the first CORESET group ID. ### Claim 3 (depends on 2) The method of claim 2, further comprising: receiving a signal indicating a first new transmit beam for the PUCCH resources associated with the first CORESET group ID; and using the first new transmit beam for the PUCCH resources associated with the first CORESET group ID. ### Claim 4 (depends on 1) The method of claim 1, further comprising: using a configured quasi co-location (QCL) configuration for a CORESET with index 0 when the CORESET with index 0 is associated with the first CORESET group ID. ### Claim 5 (depends on 4) The method of claim 4, further comprising: obtaining new QCL configuration according to the first beam failure recovery response; and using the new QCL configuration for the CORESET with index 0 to replace the configured QCL configuration. ### Claim 6 (depends on 1) The method of claim 1, further comprising: detecting a second set of beam failure detection RSs associated with a second CORESET group ID; measuring the second set of beam failure detection RSs to detect a second beam failure event associated with the second CORESET group ID; transmitting a second beam failure recovery request message associated with the second CORESET group ID when the second beam failure event is detected; and monitoring a search space for a second beam failure recovery response which responds to the second beam failure recovery request. ### Claim 7 (depends on 6) The method of claim 6, further comprising: using a second default transmit beam for physical uplink control channel (PUCCH) resources associated with the second CORESET group ID. ### Claim 8 (depends on 7) The method of claim 7, further comprising: receiving a signal indicating a second new transmit beam for the PUCCH resources associated with the second CORESET group ID; and using the second new transmit beam for the PUCCH resources associated with the second CORESET group ID. ### Claim 9 (depends on 6) The method of claim 6, further comprising: using a configured quasi co-location (QCL) configuration for a CORESET with index 0 when the CORESET with index 0 is associated with the second CORESET group ID; obtaining new QCL configuration according to the second beam failure recovery response; and using the new QCL configuration for the CORESET with index 0 to replace the configured QCL configuration. ### Claim 10 An apparatus for beam failure recovery, comprising: a transceiver configured for receiving reference signals (RSs); and a processor configured for detecting a first set of beam failure detection RSs associated with a first control resource set (CORESET) group identifier (ID); wherein the processor measures the first set of beam failure detection RSs to detect a first beam failure event associated with the first CORESET group ID; wherein the processor transmits a first beam failure recovery request message associated with the first CORESET group ID when the first beam failure event is detected; wherein the processor monitors a search space for a first beam failure recovery response which responds to the first beam failure recovery request, and wherein the processor further selects a RS from a first set of new beam identification RSs associated with the first CORESET group ID, of which link quality is measured as greater than a first threshold, and the processor transmits a random access channel (RACH) preamble associated with the RS selected from the first set of new beam identification RSs for a beam failure recovery process associated with the first CORESET group ID, wherein the RACH preamble comprises the first beam failure recovery request. ### Claim 11 (depends on 10) The apparatus of claim 10, wherein the processor further uses a first default transmit beam for physical uplink control channel (PUCCH) resources associated with the first CORESET group ID. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the processor further receives a signal indicating a first new transmit beam for the PUCCH resources associated with the first CORESET group ID, and uses the first new transmit beam for the PUCCH resources associated with the first CORESET group ID. ### Claim 13 (depends on 10) The apparatus of claim 10, wherein the processor further uses a configured quasi co-location (QCL) configuration for a CORESET with index 0 when the CORESET with index 0 is associated with the first CORESET group ID. ### Claim 14 (depends on 13) The apparatus of claim 13, wherein the processor further obtains new QCL configuration according to the first beam failure recovery response, and uses the new QCL configuration for the CORESET with index 0 to replace the configured QCL configuration. ### Claim 15 (depends on 10) The apparatus of claim 10, wherein the processor further detects a second set of beam failure detection RSs associated with a second CORESET group ID, and measures the second set of beam failure detection RSs to detect a second beam failure event associated with the second CORESET group ID; wherein the transceiver transmits a second beam failure recovery request message associated with the second CORESET group ID when the second beam failure event is detected; and wherein the processor monitors a search space for a second beam failure recovery response which responds to the second beam failure recovery request. ### Claim 16 (depends on 15) The apparatus of claim 15, wherein the processor further uses a second default transmit beam for physical uplink control channel (PUCCH) resources associated with the second CORESET group ID. ### Claim 17 (depends on 16) The apparatus of claim 16, wherein the processor receives a signal indicating a second new transmit beam for the PUCCH resources associated with the second CORESET group ID, and uses the second new transmit beam for the PUCCH resources associated with the second CORESET group ID. ### Claim 18 (depends on 15) The apparatus of claim 15, wherein the processor further uses a configured quasi co-location (QCL) configuration for a CORESET with index 0 when the CORESET with index 0 is associated with the second CORESET group ID; wherein the processor obtains new QCL configuration according to the second beam failure recovery response, and uses the new QCL configuration for the CORESET with index 0 to replace the configured QCL configuration.