US 10,485,045 B2
Random access method and apparatus for use in wireless communication system supporting dual connectivity
Jaehyuk Jang, Suwon-si (KR); Soenghun Kim, Suwon-si (KR); Gert-Jan Van Lieshout, Apeldoorn (NL); and Youngbum Kim, Seoul (KR)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si, Gyeonggi-do (KR)
Filed on Feb. 2, 2018, as Appl. No. 15/887,542.
Application 15/887,542 is a continuation of application No. 14/877,314, filed on Oct. 7, 2015, granted, now 9,888,514, issued on Feb. 6, 2018.
Application 14/877,314 is a continuation of application No. 14/661,459, filed on Mar. 18, 2015, granted, now 9,854,619, issued on Dec. 26, 2017.
Claims priority of application No. 10-2014-0033497 (KR), filed on Mar. 21, 2014.
Prior Publication US 2018/0184478 A1, Jun. 28, 2018
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 76/15 (2018.01); H04W 52/30 (2009.01); H04W 52/36 (2009.01); H04W 52/48 (2009.01); H04W 74/08 (2009.01); H04W 52/14 (2009.01); H04W 52/50 (2009.01); H04W 52/24 (2009.01); H04L 5/00 (2006.01); H04W 52/34 (2009.01); H04W 52/40 (2009.01)
CPC H04W 76/15 (2018.02) [H04W 52/146 (2013.01); H04W 52/30 (2013.01); H04W 52/36 (2013.01); H04W 52/367 (2013.01); H04W 52/48 (2013.01); H04W 52/50 (2013.01); H04W 74/0833 (2013.01); H04L 5/001 (2013.01); H04W 52/244 (2013.01); H04W 52/34 (2013.01); H04W 52/346 (2013.01); H04W 52/365 (2013.01); H04W 52/40 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method by a terminal, the method comprising:
identifying that a first physical random access channel (PRACH) transmission of the terminal on a first cell of a first base station is overlapped with a second PRACH transmission of the terminal on a second cell of a second base station in a time domain and a sum of transmission power determined for the first PRACH transmission of the terminal and transmission power determined for the second PRACH transmission of the terminal exceeds a maximum transmission power configured for transmissions overlapped in the time domain for a dual connectivity;
performing the first PRACH transmission of the terminal on the first cell based on the transmission power determined for the first PRACH transmission;
adjusting the transmission power determined for the second PRACH transmission and performing the second PRACH transmission of the terminal on the second cell based on the adjusted transmission power;
in a case that no random access response for the first cell is received for a first predetermined time, performing an increase of a number of a PRACH transmission for the first cell and performing a PRACH retransmission on the first cell based on a transmission power which is determined based on the number of the PRACH transmission for the first cell; and
in a case that no random access response for the second cell is received for a second predetermined time, skipping an increase of a number of a PRACH transmission for the second cell and performing a PRACH retransmission on the second cell based on a transmission power which is determined based on the number of the PRACH transmission for the second cell.