Terminal device and control method for performing an improved handover.

Abstract

To improve communication efficiency during handover. [Solution] The base station device notifies the connected terminal device of the settings of the Radio Resource Control (RRC) layer for one or more candidate cells that are the destination for switching from at least one of the one or more cells to which the terminal device is connected, obtains timing advance values ​​for one or more candidate cells, and sends a command to the terminal device instructing it to change the destination cell using those settings, wherein when the terminal device connects to multiple cells after the destination change, the command includes information indicating the first timing advance value used by the first cell among the multiple cells and the second timing advance value used by the second cell among the multiple cells.

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