US 11,743,957 B2
Method and apparatus for initial access in wireless communication system
Youngdae Lee, Seoul (KR); and Sangwon Kim, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Filed by LG Electronics Inc., Seoul (KR)
Filed on Jan. 21, 2020, as Appl. No. 16/747,969.
Claims priority of application No. 10-2019-0007438 (KR), filed on Jan. 21, 2019; application No. 10-2019-0007452 (KR), filed on Jan. 21, 2019; and application No. 10-2019-0007476 (KR), filed on Jan. 21, 2019.
Prior Publication US 2020/0236726 A1, Jul. 23, 2020
Int. Cl. H04W 76/15 (2018.01); H04W 48/08 (2009.01); H04W 74/08 (2009.01); H04W 24/08 (2009.01)
CPC H04W 76/15 (2018.02) [H04W 24/08 (2013.01); H04W 48/08 (2013.01); H04W 74/0833 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method performed by a wireless device in a wireless communication system, the method comprising:
camping on a first cell;
receiving, from the first cell the wireless device camps on, system information, wherein the system information comprises information informing one or more candidate cells for a duplicated access including a second cell;
measuring a signal quality of the first cell and a signal quality of the second cell; and
based on a determination that the signal quality of the first cell and the signal quality of the second cell are within an offset, performing an initial access to both of the first cell and the second cell, wherein the performing of the initial access to both of the first cell and the second cell comprises:
transmitting a first random access preamble to the first cell and a second random access preamble to the second cell;
receiving a first random access response comprising a first uplink grant from the first cell, and a second random access response comprising a second uplink grant from the second cell, after transmitting the first random access preamble, and the second random access preamble;
transmitting a first connection request message based on the first uplink grant via a physical uplink shared channel (PUSCH) to the first cell, and a second connection request message based on the second uplink grant via a PUSCH to the second cell, wherein the second connection request message is a duplicate connection request message of the first connection request message; and
after transmitting the first connection request message and the second connection request message, receiving, at least one of a first connection response message via a physical downlink shared channel (PDSCH) from the first cell, or a second connection response message via a PDSCH from the second cell.