Patent ID: 9565711
Date: 2017-02-07
CPC Classifications: H04L,H04W,Y02D

Claim:
1. A method for uplink timing adjustment by a terminal, the method comprising: receiving, from a base station, a respective identifier of at least one timing advance group (TAG) and information on a time alignment timer associated with each TAG; receiving, from the base station, an identifier of TAG for a secondary cell to be configured; receiving, from the base station, a MAC control element including the identity of the TAG for the secondary cell and a timing advance command (TAC); applying the timing advance command for the TAG of the secondary cell based on the received MAC control element; and starting a time alignment timer for the TAG of the secondary cell based on the received information on a time alignment timer associated with the TAG of the secondary cell if the MAC control element is received, wherein the TAG is a group of at least one secondary cell having same uplink timing.