Method and apparatus for transmitting indication of cell coverage in wireless communication system

1. A method for transmitting coverage modification information in a wireless communication system, the method comprising:

transmitting, by a first base station, the coverage modification information which indicates that removing a cell managed by the first base station is planned, to a second base station; and

after the first base station transmits the coverage modification information to the second base station, removing, by the first base station, the cell managed by the first base station.

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

a transceiver configured to transmit or receive a radio signal; and

a processor, coupled to the transceiver, that:

controls the transceiver to transmit coverage modification information which indicates that removing a cell managed by the first base station is planned, to a second base station, and

after the coverage modification information is transmitted to the second base station, removes the cell managed by the first base station.

3. The method of claim 1 , further comprising:

determining to remove the cell managed by the first base station, in an active antenna system (AAS);

receiving a handover request message from the second base station immediately after determining to remove the cell, before the first base station removes the cell; and

transmitting a handover preparation failure message including cause information, to the second base station, in response to the receiving the handover request message,

wherein the cause information indicates that removing the cell is planned; and

after the transmitting the handover preparation failure message, removing the cell managed by the first base station.

4. The method of claim 1 , wherein the cell managed by the first base station is removed by using an active antenna system (AAS).