Communication control method and base station

A first base station configured to be connected with a second base station via an X2 interface, comprising:

• a controller containing at least one processor and at least one memory, and configured to execute processes of
• transmitting a message, which includes a first identifier, coverage state information, and a second identifier, to the second base station before modifying a coverage of the first cell, the first identifier identifying the first cell, the coverage state information indicating a state of the coverage after modification of the coverage, the second identifier identifying a second cell for compensating at least part of the coverage of the first cell, and
• modifying the coverage of the first cell after transmitting the message.

A second base station configured to be connected with a first base station via an X2 interface, comprising:

• a controller containing at least one processor and at least one memory, and configured to execute processes of
• receiving a message, which includes a first identifier, coverage state information, and a second identifier from the first base station before a coverage of the first cell is modified, the first identifier identifying the first cell, the coverage state information indicating a state of the coverage of the first cell after modification of the coverage, the second identifier identifying a second cell for compensating at least part of the coverage of the first cell, and
• determining that the first base station modifies the coverage of the first cell, based on the first identifier, and the coverage state information.

A processor for controlling a first base station configured to be connected with a second base station via an X2 interface, configured to:

• transmit a message, which includes a first identifier, coverage state information, and a second identifier, to the second base station before modifying a coverage of the first cell, the first identifier identifying the first cell, the coverage state information indicating a state of the coverage after modification of the coverage, the second identifier identifying a second cell for compensating at least part of the coverage of the first cell, and
• modify the coverage of the first cell after transmitting the message.