Method of performing uplink transmission and related communication device

摘要

A method of performing uplink transmission for a mobile device configured with a primary component carrier and at least one secondary component carrier in a wireless communication system is disclosed. The method comprises steps of receiving a first uplink grant for transmission in a subframe; receiving a second uplink grant in a Random Access Response message for transmission on the primary component carrier in the subframe; and performing transmission in the subframe according to which of the primary component carrier and the at least one secondary component carrier the first uplink grant is received for.