Method and apparatus for controlling activation of cell group in wireless communication system

1. A method, performed by a user equipment (UE), for activating a secondary cell (SCell), the method comprising:

receiving, from a base station (BS), a radio resource control (RRC) message including cell configuration information of the SCell,

wherein the cell configuration information includes a bandwidth part (BWP) identifier indicating a first downlink BWP for activation of the SCell and information related to configuration of reference signals for activation of the SCell, and

wherein the information related to configuration of the reference signals for activation of the SCell indicates an interval between the reference signals for activation of the SCell and a number of the reference signals for activation of the SCell;

receiving, from the BS, a medium access control (MAC) control element (CE) indicating activation of the SCell; and

activating the first downlink BWP indicated by the BWP identifier, based on the interval between the reference signals for activation of the SCell and the number of the reference signals for activation of the SCell.

2. The method of claim 1 , wherein the RRC message further comprises a BWP identifier indicating a first uplink BWP for activation of the SCell.

3. The method of claim 2 , further comprising:

activating the first uplink BWP, in response to the MAC CE indicating activation of the SCell.

4. The method of claim 1 , further comprising:

receiving the reference signals for activation of the SCell within the first downlink BWP, based on the interval between the reference signals for activation of the SCell and the number of the reference signals for activation of the SCell.

5. The method of claim 4 , further comprising:

transmitting a measurement result based on the received reference signals for activation of the SCell.

6. The method of claim 1 , wherein the cell configuration information further comprises information related to configuration of channel measurement signals.

7. The method of claim 6 , further comprising:

based on the cell configuration information comprising the information related to configuration of the reference signals for activation of the SCell, identifying the reference signals for activation of the SCell based on the interval between the reference signals for activation of the SCell and the number of the reference signals for activation of the SCell, and activating the SCell using the identified reference signals; and

based on the cell configuration information not comprising the information related to configuration of the reference signals for activation of the SCell, obtaining a channel measurement result for the SCell using the channel measurement signals, and transmitting the channel measurement result.

8. A method, performed by a base station (BS), for activating a secondary cell (SCell), the method comprising:

transmitting, to a user equipment (UE), a radio resource control (RRC) message including cell configuration information of the SCell,

wherein the cell configuration information includes a bandwidth part (BWP) identifier indicating a first downlink BWP for activation of the SCell and information related to configuration of reference signals for activation of the SCell, and

wherein the information related to configuration of the reference signals for activation of the SCell indicates an interval between the reference signals for activation of the SCell and a number of the reference signals for activation of the SCell; and

transmitting, to the UE, a medium access control (MAC) control element (CE) indicating activation of the SCell,

wherein the first downlink BWP indicated by the BWP identifier is activated at the UE, based on the interval between the reference signals for activation of the SCell and the number of the reference signals for activation of the SCell.

9. The method of claim 8 , wherein the RRC message further comprises a BWP identifier indicating a first uplink BWP for activation of the SCell.

10. The method of claim 9 , wherein the first uplink BWP is activated at the UE, in response to the MAC CE indicating activation of the SCell.

11. The method of claim 8 , further comprising:

transmitting, to the UE, the reference signals for activation of the SCell within the first downlink BWP, based on the interval between the reference signals for activation of the SCell and the number of the reference signals for activation of the SCell.

12. The method of claim 11 , further comprising:

receiving, from the UE, a measurement result based on the transmitted reference signals for activation of the SCell.

13. The method of claim 8 , wherein the cell configuration information further comprises information related to configuration of channel measurement signals.

14. The method of claim 13 , wherein based on the cell configuration information comprising the information related to configuration of the reference signals for activation of the SCell, the reference signals for activation of the SCell are identified at the UE based on the interval between the reference signals for activation of the SCell and the number of the reference signals for activation of the SCell, and the SCell is activated at the UE using the identified reference signals, and

wherein based on the cell configuration information not comprising the information related to configuration of the reference signals for activation of the SCell, a channel measurement result for the SCell is obtained at the UE using the channel measurement signals and the channel measurement result is received from the UE.

15. A user equipment (UE) configured to activate a secondary cell (SCell), the UE comprising:

a transceiver; and

a processor coupled with the transceiver and configured to:

receive, from a base station (BS), a radio resource control (RRC) message including cell configuration information of the SCell,

wherein the cell configuration information includes a bandwidth part (BWP) identifier indicating a first downlink BWP for activation of the SCell and information related to configuration of reference signals for activation of the SCell, and

wherein the information related to configuration of the reference signals for activation of the SCell indicates an interval between the reference signals for activation of the SCell and a number of the reference signals for activation of the SCell;

receive, from the BS, a medium access control (MAC) control element (CE) indicating activation of the SCell; and

activate the first downlink BWP indicated by the BWP identifier, based on the interval between the reference signals for activation of the SCell and the number of the reference signals for activation of the SCell.

16. The UE of claim 15 , wherein the RRC message further comprises a BWP identifier indicating a first uplink BWP for activation of the SCell.

17. The UE of claim 16 , wherein the processor is further configured to:

activate the first uplink BWP, in response to the MAC CE indicating activation of the SCell.

18. The UE of claim 15 , wherein the processor is further configured to:

receive the reference signals for activation of the SCell within the first downlink BWP, based on the interval between the reference signals for activation of the SCell and the number of the reference signals for activation of the SCell.

19. The UE of claim 18 , wherein the processor is further configured to:

transmit a measurement result based on the received reference signals for activation of the SCell.

20. The UE of claim 15 , wherein the cell configuration information further comprises information related to configuration of channel measurement signals.

21. The UE of claim 20 , wherein the processor is further configured to:

based on the cell configuration information comprising the information related to configuration of the reference signals for activation of the SCell, identify the reference signals for activation of the SCell based on the interval between the reference signals for activation of the SCell and the number of the reference signals for activation of the SCell, and activate the SCell using the identified reference signals; and

based on the cell configuration information not comprising the information related to configuration of the reference signals for activation of the SCell, obtain a channel measurement result for the SCell using the channel measurement signals, and transmit the channel measurement result.