US 11,902,938 B2
Method and apparatus for determining radio link failure
June Hwang, Incheon (KR); Hyunjeong Kang, Seoul (KR); Sangwook Kwon, Suwon-si (KR); Youngjoong Mok, Suwon-si (KR); Jungmin Moon, Suwon-si (KR); Anil Agiwal, Suwon-si (KR); and Byounghoon Jung, Suwon-si (KR)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on Apr. 14, 2021, as Appl. No. 17/230,865.
Application 17/230,865 is a continuation of application No. 16/347,511, granted, now 11,006,389, previously published as PCT/KR2017/012425, filed on Nov. 3, 2017.
Claims priority of application No. 10-2016-0146082 (KR), filed on Nov. 3, 2016; and application No. 10-2017-0019388 (KR), filed on Feb. 13, 2017.
Prior Publication US 2021/0235422 A1, Jul. 29, 2021
Int. Cl. H04W 72/02 (2009.01); H04W 72/044 (2023.01); H04W 36/06 (2009.01); H04W 76/27 (2018.01); H04W 74/08 (2009.01); H04W 72/543 (2023.01); H04B 7/06 (2006.01)
CPC H04W 72/02 (2013.01) [H04B 7/0695 (2013.01); H04W 36/06 (2013.01); H04W 72/046 (2013.01); H04W 72/543 (2023.01); H04W 74/0833 (2013.01); H04W 76/27 (2018.02)] 10 Claims
OG exemplary drawing
 
1. A method performed by a terminal in a wireless communication system, the method comprising:
performing a measurement on multiple beams on a serving cell;
based on the measurement, identifying whether a beam failure for a serving beam of the multiple beams is detected, wherein a detection of the beam failure is performed based on a beam failure detection timer;
in case that the beam failure for the serving beam is detected, determining to initiate a random access procedure for a beam failure recovery;
based on a determination to initiate the random access procedure for the beam failure recovery, starting a beam failure recovery timer; and
during a running of the beam failure recovery timer, transmitting, to a base station, a random access preamble for a beam failure recovery request, based on a random access preamble dedicated to the beam failure recovery request,
wherein the random access preamble dedicated to the beam failure recovery request is associated with a selection of a suitable beam for the terminal, and
wherein the beam failure is detected in case that a number of beam failure instance is equal to or larger than a predetermined value.