US 11,743,964 B2
Method for performing beam failure recovery in wireless communication system and apparatus for the same
Minki Ahn, Seoul (KR); Jiwon Kang, Seoul (KR); Kijun Kim, Seoul (KR); and Suckchel Yang, Seoul (KR)
Assigned to LG Electronics Inc., Seoul (KR)
Filed by LG ELECTRONICS INC., Seoul (KR)
Filed on Dec. 7, 2021, as Appl. No. 17/544,207.
Application 17/544,207 is a continuation of application No. 16/623,299, granted, now 11,229,081, previously published as PCT/KR2018/006083, filed on May 29, 2018.
Claims priority of provisional application 62/537,967, filed on Jul. 28, 2017.
Claims priority of provisional application 62/521,253, filed on Jun. 16, 2017.
Prior Publication US 2022/0095406 A1, Mar. 24, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 76/19 (2018.01); H04B 7/06 (2006.01); H04W 74/00 (2009.01)
CPC H04W 76/19 (2018.02) [H04B 7/0626 (2013.01); H04W 74/004 (2013.01); H04W 74/006 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising:
receiving, from a base station (BS), configuration information including a candidate beam reference signal list (candidate beam RS list) and a threshold related to a beam failure recovery;
detecting a beam failure based on a measurement of a radio link quality for one or more beam failure detection reference signals that include at least one of a Synchronization Signal Block (SSB) or a Channel State Information-Reference Signal (CSI-RS) from the candidate beam RS list;
based on detection of the beam failure, transmitting, to the BS, a beam failure recovery request,
wherein, based on i) the beam failure recovery request being transmitted based on a contention free random access resource, ii) the beam failure recovery request being related to a selected SSB or a selected CSI-RS with a radio link quality higher than the threshold from the candidate beam RS list based on the measurement, and iii) a response for the beam failure recovery request not being received within a configured time window: the beam failure recovery request is retransmitted based on a contention based random access resource after the configured time window,
wherein the response for the beam failure recovery request is a physical downlink control channel (PDCCH) related to a demodulation reference signal (DM-RS) which is quasi co-located with the selected SSB or the selected CSI-RS; and
receiving, from the BS, the response for the beam failure recovery request.