Method for performing beam failure recovery procedure in wireless communication system, and device therefor

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.

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.