公开(公告)号：US09942891B2

公开(公告)日：2018-04-10

申请号：US15347367

申请日：2016-11-09

Applicant: LG ELECTRONICS INC.

Inventor： Suck chel Yang ,  Min Gyu Kim ,  Joon Kui Ahn ,  Dong Youn Seo

IPC: H04W72/04 ,  H04L1/00 ,  H04W72/08 ,  H04W56/00 ,  H04W74/08 ,  H04W76/04

CPC classification number: H04W72/042 ,  H04L1/0026 ,  H04L5/001 ,  H04L27/2655 ,  H04W56/0005 ,  H04W72/087 ,  H04W74/0833 ,  H04W76/28

Abstract: A method, a user equipment, and a base station for maintaining uplink synchronization in a wireless communication system supporting carrier aggregation are discussed. The method of maintaining uplink synchronization at a user equipment according to an embodiment includes receiving a physical downlink control channel (PDCCH) order. The PDCCH order indicates an initiation of a random access procedure and includes a carrier indicator field and a predefined set of values of a 1-bit flag indicating a localized/distributed resource block assignment, and a resource block assignment field. The method further includes transmitting a random access preamble through an uplink component carrier corresponding to a value of the carrier indicator field among a plurality of uplink component carriers.

公开(公告)号：US09888468B2

公开(公告)日：2018-02-06

申请号：US15347367

申请日：2016-11-09

Applicant: LG ELECTRONICS INC.

Inventor： Suck chel Yang ,  Min Gyu Kim ,  Joon Kui Ahn ,  Dong Youn Seo

IPC: H04W72/04 ,  H04L1/00 ,  H04W72/08 ,  H04W56/00 ,  H04W74/08 ,  H04W76/04

Abstract: A method, a user equipment, and a base station for maintaining uplink synchronization in a wireless communication system supporting carrier aggregation are discussed. The method of maintaining uplink synchronization at a user equipment according to an embodiment includes receiving a physical downlink control channel (PDCCH) order. The PDCCH order indicates an initiation of a random access procedure and includes a carrier indicator field and a predefined set of values of a 1-bit flag indicating a localized/distributed resource block assignment, and a resource block assignment field. The method further includes transmitting a random access preamble through an uplink component carrier corresponding to a value of the carrier indicator field among a plurality of uplink component carriers.