| 摘要 |
A method and apparatus are disclosed to activate component carriers in a wireless communication system. The method includes sending a dedicated resource control (RRC) signal to configure a user equipment with a plurality of component carriers for carrier aggregation. The method further includes sending an activation signal to the UE to activate a component carrier. The method also includes using the activation signal to request the UE to initiate a random access procedure on the activated component carrier to update the timing advance for uplink transmissions.
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