Patent ID: 9585188
Date: 2017-02-28
CPC Classifications: H04L,H04W,Y02D

Claim:
1. A method for uplink timing adjustment by a base station, the method comprising: transmitting, to a terminal, a radio resource control message to configure a secondary cell (SCell) for a carrier aggregation (CA); generating a medium access control (MAC) protocol data unit (PDU) including a MAC control element (MAC CE), wherein the MAC CE includes an identity of a timing advance group (TAG) including the SCell and a timing advance command (TAC) for uplink timing adjustment of the TAG including the SCell; and transmitting the MAC PDU to the terminal, wherein the TAG is a group of at least one cell having same uplink timing, wherein the identity of the TAG is set to 0 if the TAG including the SCell is a primary TAG (PTAG), and wherein the PTAG is a TAG that includes a primary cell (PCell).