Apparatus and method for measurement in wireless communication system

A method performed by a base station in a wireless communication system, the method comprising:

• transmitting, to a terminal, a first medium access control (MAC) control element (CE) or a second MAC CE, wherein the first MAC CE indicates whether a secondary cell (SCell) of the terminal is transitioned into an activated state or a deactivated state, and the second MAC CE indicates whether the SCell is transitioned into the activated state or a dormant state,
• wherein the SCell of the terminal is in a first status before the first MAC CE or the second MAC CE is transmitted,
• wherein a second status for the SCell is based on the first status and the first MAC CE, in case that the first MAC CE is transmitted to the terminal and the second MAC CE is not transmitted to the terminal,
• wherein, in case that the first status for the SCell is the dormant state and the first MAC CE indicates that the SCell is transitioned into the activated state, the second status for the SCell is maintained as the dormant state, and
• wherein, in case that the first status for the SCell is the dormant state and the first MAC CE indicates that the SCell is transitioned into the deactivated state, the second status for the SCell is the deactivated state.

A terminal in a wireless communication system, the terminal comprising:

• a transceiver;
• and
• at least one processor coupled with the transceiver and configured to:
• identify a first status for a secondary cell (SCell) of the terminal,
• identify whether a first medium access control (MAC) control element (CE) or a second MAC CE is received from a base station, wherein the first MAC CE indicates whether the SCell is transitioned into an activated state or a deactivated state, and the second MAC CE indicates whether the SCell is transitioned into the activated state or a dormant state, and
• identify a second status for the SCell based on the first status and the first MAC CE, in case that the first MAC CE is received from the base station and the second MAC CE is not received from the base station,
• wherein, in case that the first status for the SCell is the dormant state and the first MAC CE indicates that the SCell is transitioned into the activated state, the second status for the SCell is identified to be maintained as the dormant state, and
• wherein, in case that the first status for the SCell is the dormant state and the first MAC CE indicates that the SCell is transitioned into the deactivated state, the second status for the SCell is identified as the deactivated state.

A base station in a wireless communication system, the base station comprising:

• a transceiver;
• and
• at least one processor coupled with the transceiver and configured to:
• transmit, to a terminal, a first medium access control (MAC) control element (CE) or a second MAC CE, wherein the first MAC CE indicates whether a secondary cell (SCell) of the terminal is transitioned into an activated state or a deactivated state, and the second MAC CE indicates whether the SCell is transitioned into the activated state or a dormant state,
• wherein the SCell of the terminal is in a first status before the first MAC CE or the second MAC CE is transmitted,
• wherein a second status for the SCell is based on the first status and the first MAC CE, in case that the first MAC CE is transmitted to the terminal and the second MAC CE is not transmitted to the terminal,
• wherein, in case that the first status for the SCell is the dormant state and the first MAC CE indicates that the SCell is transitioned into the activated state, the second status for the SCell is maintained as the dormant state, and
• wherein, in case that the first status for the SCell is the dormant state and the first MAC CE indicates that the SCell is transitioned into the deactivated state, the second status for the SCell is the deactivated state.