Method and apparatus for beam failure recovery in wireless communication system

A user equipment (UE) operating in a wireless communication system, the UE comprising:

• at least one transceiver for transmitting and receiving a wireless signal;
• and
• at least one processor for controlling the at least one transceiver,
• wherein the at least one processor configured to:
• receive configuration information related to beam failure recovery (BFR) from a base station, wherein the configuration information includes a first candidate beam reference signal (RS) list and a second candidate beam RS list;
• and
• transmit a random access preamble for a BFR request to the base station based on beam failure being detected according to an assessment of radio link quality for a beam failure detection RS,
• wherein the random access preamble is transmitted based on a candidate beam RS list selected from the first candidate beam RS list and the second candidate beam RS list, and
• wherein a search space for receiving a response to the random access preamble is determined based on the selected candidate beam RS list.

A base station operating in a wireless communication system, the base station comprising:

• at least one transceiver for transmitting and receiving a wireless signal;
• and
• at least one processor for controlling the at least one transceiver,
• wherein the at least one processor configured to:
• transmit configuration information related to beam failure recovery (BFR) to a user equipment (UE), wherein the configuration information includes a first candidate beam reference signal (RS) list and a second candidate beam RS list;
• and
• receive a random access preamble for a BFR request from the UE based on beam failure being detected according to an assessment of radio link quality for a beam failure detection RS,
• wherein the random access preamble is transmitted based on a candidate beam RS list selected from the first candidate beam RS list and the second candidate beam RS list, and
• wherein a search space for receiving a response to the random access preamble is determined based on the selected candidate beam RS list.