US 12,408,169 B2
Apparatus and method for performing random access in beam-formed system
Anil Agiwal, Suwon-si (KR); Youngbin Chang, Anyang-si (KR); and Nigam Anshuman, Bangalore (IN)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on Feb. 8, 2024, as Appl. No. 18/436,645.
Application 18/436,645 is a continuation of application No. 17/584,933, filed on Jan. 26, 2022, granted, now 11,902,978, issued on Feb. 13, 2024.
Application 17/584,933 is a continuation of application No. 16/783,811, filed on Feb. 6, 2020, granted, now 11,240,784, issued on Feb. 1, 2022.
Application 16/783,811 is a continuation of application No. 16/276,030, filed on Feb. 14, 2019, granted, now 10,595,304, issued on Mar. 17, 2020.
Application 16/276,030 is a continuation of application No. 15/443,562, filed on Feb. 27, 2017, granted, now 10,278,160, issued on Apr. 30, 2019.
Claims priority of provisional application 62/334,660, filed on May 11, 2016.
Claims priority of provisional application 62/300,333, filed on Feb. 26, 2016.
Prior Publication US 2024/0188082 A1, Jun. 6, 2024
Int. Cl. H04W 72/20 (2023.01); H04B 7/06 (2006.01); H04W 74/0833 (2024.01)
CPC H04W 72/20 (2023.01) [H04B 7/0617 (2013.01); H04W 74/0833 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method performed by a terminal in a wireless communication system, the method comprising:
transmitting, to a base station, a first random access preamble using a first transmission beam based on a first power;
identifying whether a random access response is received from the base station as a response to the first random access preamble;
in case that the random access response is not received, incrementing a power ramping counter and identifying a second transmission beam for transmitting a second random access preamble;
determining a second power for transmitting the second random access preamble, wherein:
in case that the second transmission beam is identical to the first transmission beam, the second power is determined based on the first power and the incremented power ramping counter, or
in case that the second transmission beam is different from the first transmission beam, the second power is determined based on an initial power value; and
transmitting, to the base station, the second random access preamble using the second transmission beam based on the determined second power,
wherein a maximum value of the power ramping counter is configured by the base station.