# US 12,003,310 B2 · Method for performing beam failure recovery procedure in wireless communication system, and device therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,003,310 B2 - Document ID: US12003310B2 - Status: Granted - Kind: B2 - Application number: 17/623,359 - Filed: 2020-06-29 - Published: 2022-11-17 - Granted: 2024-06-04 - Earliest claimed: 2019-06-28 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Jiwon Kang; Jonghyun Park - Web page: https://patentgrep.com/patent/US12003310B2 ## CPC - H04B 7/0888: {with selection} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04B 7/022: Site diversity; Macro-diversity (using two or more spaced independent antennas H04B7/04) - H04B 7/061: {using feedback from receiving side} - H04B 7/06964: {Re-selection of one or more beams after beam failure} - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04L 5/0035: {Resource allocation in a cooperative multipoint environment} - 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)} - H04W 72/046: {the resource being in the space domain, e.g. beams} - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 74/0838: using contention-free random access [CFRA] - H04W 76/15: Setup of multiple wireless link connections - Y02D 30/70: in wireless communication networks - 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) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract A method by which a terminal performs a beam failure recovery (BFR) procedure in a wireless communication system, according to one embodiment of the present specification, comprises the steps of: receiving setting information related to a physical uplink control channel (PUCCH); transmitting the PUCCH on the basis of the setting information, the PUCCH being related to BFR of at least one secondary cell (SCell); and transmitting a message comprising information related to the BFR. The message comprising the information related to the BFR is related to a beam failure detected before a specific time point. ## Claims ### Claim 1 A method performed by a user equipment (UE) in a wireless communication system, the method comprising: receiving configuration information that includes a set of Physical Uplink Control Channel (PUCCH) resources for a scheduling request (SR); based on a beam failure recovery (BFR) for a first Secondary Cell (SCell) being triggered, transmitting a PUCCH based on the PUCCH resources for the SR used for requesting Uplink-Shared Channel (UL-SCH) resources; and based on the UL-SCH resources being available, transmitting a BFR medium access control control element (MAC CE) that includes information indicating a beam failure detection for one or more SCells, wherein the BFR MAC CE is generated based on a multiplexing and assembly procedure related to a MAC Protocol Data Unit (PDU), and wherein the one or more SCells include i) the first SCell and ii) at least one second SCell for which at least one BFR is triggered before the multiplexing and assembly procedure related to the MAC PDU. ### Claim 2 (depends on 1) The method of claim 1, wherein the BFR MAC CE includes information related to one or more Reference Signals (RSs) identifying one or more candidate beams. ### Claim 3 (depends on 1) The method of claim 1, wherein a beam failure is detected based on a value of a beam failure instance (BFI) counter being greater than or equal to a beam failure instance Max count. ### Claim 4 (depends on 3) The method of claim 3, wherein the BFI counter is set for each serving cell, and wherein, based on i) a value of the BFI counter for a serving cell being greater than or equal to the beam failure instance Max count and ii) the serving cell being a SCell; a BFR for the SCell is triggered. ### Claim 5 A user equipment (UE) configured to operate in a wireless communication system, the UE comprising: one or more transceivers; one or more processors controlling the one or more transceivers; and one or more memories operably connectable to the one or more processors, and storing instructions, based on being executed by the one or more processors, configure the one or more processors to perform operations comprising: receiving configuration information that includes a set of Physical Uplink Control Channel (PUCCH) resources for a scheduling request (SR); based on a beam failure recovery (BFR) for a first Secondary Cell (SCell) being triggered, transmitting a PUCCH based on the PUCCH resources for the SR used for requesting Uplink-Shared Channel (UL-SCH) resources; and based on the UL-SCH resources being available, transmitting a BFR medium access control control element (MAC CE) that includes information indicating a beam failure detection for one or more SCells, wherein the BFR MAC CE is generated based on a multiplexing and assembly procedure related to a MAC Protocol Data Unit (PDU), and wherein the one or more SCells include i) the first SCell and ii) at least one second SCell for which at least one BFR is triggered before the multiplexing and assembly procedure related to the MAC PDU. ### Claim 6 (depends on 5) The UE of claim 5, wherein the BFR MAC CE includes information related to one or more Reference Signals (RSs) identifying one or more candidate beams. ### Claim 7 A base station configured to operate in a wireless communication system, the base station comprising: one or more transceivers; one or more processors controlling the one or more transceivers; and one or more memories operably connectable to the one or more processors, and storing instructions, based on being executed by the one or more processors, configure the one or more processors to perform operations comprising: transmitting configuration information that includes a set of Physical Uplink Control Channel (PUCCH) resources for a scheduling request (SR); based on a beam failure recovery (BFR) for a first Secondary Cell (SCell) being triggered, receiving a PUCCH based on the PUCCH resources for the SR used for requesting Uplink-Shared Channel (UL-SCH) resources; and based on the UL-SCH resources being available, receiving a BFR medium access control control element (MAC CE) that includes information indicating a beam failure detection for one or more SCells, wherein the BFR MAC CE is generated based on a multiplexing and assembly procedure related to a MAC Protocol Data Unit (PDU), and wherein the one or more SCells include i) the first SCell and ii) at least one second SCell for which at least one BFR is triggered before the multiplexing and assembly procedure related to the MAC PDU.