WIRELESS COMMUNICATION SYSTEM, CENTRALIZED STATION, CENTRALIZED CONTROL METHOD AND CENTRALIZED CONTROL PROGRAM

1 . A wireless communication system comprising a centralized station which centrally controls a plurality of base stations that can each accommodate a plurality of terminals, the pluralities of terminals and base stations engaging in multi-user MIMO wireless communication, wherein

each terminal includes:

an information decoder which decodes information to be data from an RF signal received from each base station;

an energy harvester which performs a charge of a storage battery by energy harvesting using the RF signal received from the base station; and

switching circuitry configured to perform switching so that the RF signal received from the base station is supplied to either the information decoder or the energy harvester,

each base station includes:

residual amount information obtaining circuitry configured to obtain residual amount information indicating a residual amount of stored power of the storage battery of each of the terminals;

grouping circuitry configured to group the plurality of terminals into either an information transmission group that transmits information to be data or an energy harvesting group that charges the storage battery by energy harvesting based on each of the residual amount information obtained by the residual amount information obtaining circuitry and presence or absence of data to be transmitted to the terminals by the RF signal; and

control circuitry configured to control bandwidth allocation and transmission power of the RF signal transmitted to each of the terminals for each group having been grouped by the grouping circuitry, and

the centralized station includes:

collecting circuitry configured to collect terminal position information indicating a position of each of the terminals, power intensity information indicating an intensity of received power from each of the terminals, and residual amount information of the storage battery of each of the terminals via the plurality of base stations;

allocated power calculating circuitry configured to calculate allocated power with respect to each of the terminals of the base station based on the terminal position information, the power intensity information, and the residual amount information collected by the collecting circuitry;

parameter calculating circuitry configured to calculate, based on the allocated power calculated by the allocated power calculating circuitry, a parameter that optimizes bandwidth allocation and power use efficiency with respect to each of the terminals of the base station so as to minimize power consumption while raising the power use efficiency of the entire system; and

use efficiency control circuitry configured to control use efficiency of transmitted power of the RF signal transmitted by each of the base stations to each of the terminals according to the parameter calculated by the parameter calculating circuitry.

2 . The wireless communication system according to claim 1 , wherein

the parameter calculating circuitry

calculate the parameter that optimizes bandwidth allocation and power use efficiency with respect to each of the terminals of the base station by changing the number of the terminals that belong to the energy harvesting group so as to minimize the power consumption of the entire system.

3 . A centralized station which centrally controls a plurality of base stations that each engage in multi-user MIMO wireless communication with a plurality of terminals, the centralized station comprising:

collecting circuitry configured to collect terminal position information indicating a position of each of the terminals, power intensity information indicating an intensity of received power from each of the terminals, and residual amount information indicating a residual amount of stored power of a storage battery of each of the terminals via the plurality of base stations;

allocated power calculating circuitry configured to calculate allocated power with respect to each of the terminals of the base station based on the terminal position information, the power intensity information, and the residual amount information collected by the collecting circuitry;

parameter calculating circuitry configured to calculate, based on the allocated power calculated by the allocated power calculating circuitry, a parameter that optimizes bandwidth allocation and power use efficiency with respect to each of the terminals of the base station so as to minimize power consumption while raising the power use efficiency of the entire system; and

use efficiency control circuitry configured to control use efficiency of transmitted power of an RF signal transmitted by each of the base stations to each of the terminals according to the parameter calculated by the parameter calculating circuitry.

4 . The centralized station according to claim 3 , wherein

the parameter calculating circuitry

calculate the parameter that optimizes bandwidth allocation and power use efficiency with respect to each of the terminals of the base station by changing the number of the terminals that belong to an energy harvesting group which performs a charge to a storage battery by energy harvesting without receiving information to be data by the RF signal received from the base station so as to minimize the power consumption of the entire system.

5 . A centralized control method of centrally controlling a plurality of base stations that each engage in multi-user MIMO wireless communication with a plurality of terminals, the centralized control method comprising:

collecting terminal position information indicating a position of each of the terminals, power intensity information indicating an intensity of received power from each of the terminals, and residual amount information indicating a residual amount of stored power of the storage battery of each of the terminals via the plurality of base stations;

calculating allocated power with respect to each of the terminals of the base station based on the collected terminal position information, the power intensity information, and the residual amount information;

calculating, based on the calculated allocated power, a parameter that optimizes bandwidth allocation and power use efficiency with respect to each of the terminals of the base station so as to minimize power consumption while raising the power use efficiency of the entire system; and

controlling use efficiency of transmitted power of an RF signal transmitted by each of the base stations to each of the terminals according to the calculated parameter.

6 . The centralized control method according to claim 5 , wherein

in parameter calculating,

the parameter that optimizes bandwidth allocation and power use efficiency with respect to each of the terminals of the base station is calculated by changing the number of the terminals that belong to an energy harvesting group which performs a charge to the storage battery by energy harvesting without receiving information to be data by the RF signal received from the base station so as to minimize the power consumption of the entire system.

7 . A non-transitory computer-readable storage medium storing a centralized control program which causes a computer to function as each circuitry of the centralized station according to claim 3 .