| 摘要 |
A method and apparatus are disclosed to perform timing advance (TA) group change in a wireless communication system. The method includes configuring a Scell (Secondary Serving Cell) to a User Equipment (UE), wherein the Scell belongs to a first TA group. The method further includes sending a TA group change command from an eNB (evolved Node B) to the UE to change the Scell front the first TA group to a second TA group, wherein the eNB provides information together with the TA group change command so that the UE could derive an initial TA for the second TA group based on the information.
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