| 主权项 |
1. A base station comprising:
one or more processors; and memory storing instructions that, when executed, cause the base station to:
transmit, to a wireless device, at least one first radio resource control (RRC) message comprising configuration parameters of a plurality of cells being grouped into a plurality of cell groups comprising a first cell group and a second cell group, wherein:
uplink transmission timing in the first cell group is derived employing a first cell in the first cell group; anduplink transmission timing in the second cell group is derived employing a second cell in the second cell group;make a handover decision for the wireless device; andtransmit a second RRC message causing in the wireless device, modification of a cell group of a cell without explicitly releasing the cell, the second RRC message comprising mobility control information. |
