US 9,814,074 B2
Method and apparatus for random access in a wireless communication system that supports multiple carriers
Sungjun Park, Anyang-si (KR); Sunghoon Jung, Anyang-si (KR); Seungjune Yi, Anyang-si (KR); and Youngdae Lee, Anyang-si (KR)
Assigned to LG Electronics Inc., Seoul (KR)
Appl. No. 14/241,772
Filed by LG ELECTRONICS INC., Seoul (KR)
PCT Filed Sep. 27, 2012, PCT No. PCT/KR2012/007805
§ 371(c)(1), (2) Date Feb. 27, 2014,
PCT Pub. No. WO2013/048137, PCT Pub. Date Apr. 4, 2013.
Claims priority of provisional application 61/541,098, filed on Sep. 30, 2011.
Claims priority of provisional application 61/570,249, filed on Dec. 13, 2011.
Prior Publication US 2014/0219204 A1, Aug. 7, 2014
Int. Cl. H04W 4/00 (2009.01); H04W 74/08 (2009.01); H04L 1/18 (2006.01); H04W 74/00 (2009.01); H04L 5/00 (2006.01)
CPC H04W 74/0833 (2013.01) [H04L 1/1822 (2013.01); H04W 74/002 (2013.01); H04L 5/001 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for a user equipment (UE) to perform a random access procedure, the method comprising:
transmitting a random access preamble for a secondary serving cell (SCell) to a base station (BS);
receiving, from the BS, a physical downlink control channel (PDCCH) including an indicator indicating that the PDCCH is for a random access response (RAR) in response to the random access preamble;
determining that the PDCCH indicates that a physical downlink shared channel (PDSCH) includes a RAR; and
receiving, the PDSCH from the BS, and decoding the PDSCH,
wherein the UE determines that the PDSCH includes the RAR before receiving and decoding the PDSCH, and
wherein the PDSCH contains downlink data.