Method of user equipment power savings using groups of cells, and network node thereof

The method includes conducting communications with a first group of cells, and receiving a first indicator, the first indicator notifying the user equipment (UE) to enable scheduling with at least one second group of cells. The method further includes starting a first inactivity timer associated with the at least one second group of cells based on the first indicator, and scheduling communications with the at least one second group of cells following the starting of the first inactivity timer. The network node performs the method.