| 摘要 |
A base station detects a change in timing of signals received from a wireless device in a first secondary cell in a first cell group. If the base station determines that the first secondary cell needs to be assigned to a different cell group than the first cell group, the base station transmits at least one second radio resource control message configured to cause in the wireless device release of the first secondary cell. The base station assigns the first secondary cell to a second cell group different from the first cell group.
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