It is possible to include information to indicate whether the remaining state(s) is the activation state or the deactivation state according to the R field, using the R field (or a specific field) on the MAC CE indicating the dormant state. For example, in the case of the dormant MAC CE, if a SCell configured is assigned with a SCell index (SCellIndex) i, the Ci field indicates the dormant state of a SCell having the SCellIndex i. Otherwise, the MAC entity shall ignore the Ci field. In one example, the Ci field is set to 1 to indicate that a SCell having the SCellIndex i is required to transition to the dormant state. When the R field is set to 0, the Ci field is set to 0 to indicate that the SCell with the SCellIndex i shall be deactivated. When the R field is set to 1, the Ci field is set to 0 to indicate that the SCell with the SCellIndex i shall be activated. As another example, the Ci field is set to 1 to indicate that a SCell having the SCellIndex i is required to transition to the dormant state. When the R field is set to 0, the Ci field is set to 0 to indicate that the SCell with the SCellIndex i shall be activated. When the R field is set to 1, the Ci field is set to 0 to indicate that the SCell with the SCellIndex i shall be deactivated. For convenience of description, although the R field has been described, it is also included in the scope of the present disclosure to designate and process arbitrary fields included in the MAC CE as described above.