MANAGEMENT AND CONTROL APPARATUS, BASE STATION, COMMUNICATION SYSTEM AND CONTROL METHOD

1 . A management control device comprising:

a information collector configured to acquire information indicating a communication state with one or more terminals from each of one or more first base stations which perform radio communication with the one or more terminals and one or more second base stations which form a smaller range communication area than that of the one or more first base stations in a communication area formed by the one or more first base stations and perform the radio communication with the one or more terminals;

an analyzer configured to determine whether or not an optical path switching is necessary on the basis of the information;

an optical path switching controller configured to control the switching of optical paths of the one or more first base stations or optical paths of the one or more second base stations when it is determined that the optical path switching is necessary; and

a sleep controller configured to shift the one or more first base stations or the one or more second base stations to a sleep state before the optical path switching is performed or after the switching is performed.

2 . The management control device according to claim 1 , wherein

the information is traffic amount information, and

the analyzer compares a traffic amount indicated by the traffic amount information with a threshold value for determining that the optical path switching is necessary and determines that the optical path switching is necessary when the traffic amount is smaller than the threshold value.

3 . The management control device according to claim 2 , wherein

the optical path switching controller controls so as to switch the optical path of the one or more second base stations to the one or more first base stations when the traffic amount indicated by the traffic amount information obtained from the one or more second base stations is smaller than the threshold value, and

the sleep controller shifts the one or more second base stations to the sleep state before the optical path switching is performed or after the switching is performed.

4 . The management control device according to claim 2 , wherein

the optical path switching controller controls so as to switch the optical path of the one or more first base stations to the one or more second base stations when the traffic amount indicated by the traffic amount information obtained from the one or more first base stations is smaller than the threshold value, and

the sleep controller shifts the one or more first base stations to the sleep state before the optical path switching is performed or after the switching is performed.

5 . The management control device according to claim 2 , wherein

the information further includes information on communication quality of the one or more terminals, and

the analyzer determines that the optical path switching is necessary when the traffic amount is smaller than the threshold value and a condition indicating that the communication quality is good is satisfied.

6 . The management control device according to claim 5 , wherein

in a case where one or more terminals are multiple,

the analyzer determines that the optical path switching is necessary when the traffic amount is smaller than the threshold value and the condition indicating that the communication quality is good is satisfied when all terminals connected to the one or more first base stations or the one or more second base stations which become switching sources are connected to the one or more first base stations or the one or more second base stations which become switching destinations.

7 . The management control device according to claim 5 , wherein

the analyzer uses at least any of MCS (Modulation and Coding Scheme), reception power, and delay and distance of a radio section as information on the communication quality.

8 . A base station that forms a first communication area or a base station that forms a second communication area with a range smaller than that of the base station in a first communication area formed by the base station, the base station comprising:

a transmitter configured to transmit information indicating a communication state with one or more terminals to a management control device that controls a system;

a receiver configured to receive an optical path switching instruction indicating that the management control device determines that an optical path switching is necessary on the basis of the information; and

a sleep processor configured to shift to a sleep state before the optical path switching is performed or after the switching is performed based on the optical path switching instruction.

9 . (canceled)

10 . (canceled)

11 . (canceled)

12 . A control method comprising:

acquiring information indicating a communication state with one or more terminals from each of one or more first base stations which perform radio communication with the one or more terminals and one or more second base stations which form a smaller range communication area than that of the one or more first base stations in a communication area formed by the one or more first base stations and perform the radio communication with the one or more terminals;

determining whether or not an optical path switching and sleep control are necessary on the basis of the information;

controlling the switching of optical paths of the one or more first base stations or optical paths of the one or more second base stations when it is determined that the optical path switching is necessary; and

shifting the one or more first base stations or the one or more second base stations to a sleep state before the optical path switching is performed or after the switching is performed.