WE CLAIM:
[Claim 1]
A wireless communication system comprising a master wireless device and a plurality of slave wireless devices, the master wireless device and the plurality of slave wireless devices wirelessly communicating with each other, wherein
each slave wireless device of the plurality of slave wireless devices
comprises a power generation unit to generate electric power, and a power storage unit to store electric power generated by the power generation unit,
the master wireless device
comprises a cycle calculation unit to: calculate, as an available power amount, for each slave wireless device of the plurality of slave wireless devices, a power amount that can be used by each slave wireless device in a first time period; calculate, as a calculation cycle, an intermittent operation cycle in which a power consumption amount when each slave wireless device performs an intermittent operation for the first time period does not exceed the available power amount, the intermittent operation cycle being a cycle of the intermittent operation in which each slave wireless device operates and then sleeps; and select, as a common cycle, a common calculation cycle to be applied to each slave wireless device of the plurality of slave wireless devices from a plurality of calculation cycles calculated for the plurality of slave wireless devices, and
a cycle adjustment unit to determine whether or not to apply the common cycle to each slave wireless device of the plurality of slave wireless devices, based on a power storage residual amount of a slave wireless device having the calculation cycle being selected as the common cycle.

The wireless communication system according to claim 1, wherein
the master wireless device
comprises a wireless communication unit to transmit cycle adjustment information including information for performing the intermittent operation by using the common cycle, to each slave wireless device of the plurality of slave wireless devices, when it is determined by the cycle adjustment unit that the common cycle is to be applied to each slave wireless device of the plurality of slave wireless devices.
[Claim 3]
The wireless communication system according to claim 1 or 2, wherein
the cycle calculation unit
calculates, as the calculation cycle, for each slave wireless device of the plurality of slave wireless devices, a minimum intermittent operation cycle in which a power consumption amount when each slave wireless device performs the intermittent operation for the first time period does not exceed the available power amount.
[Claim 4]
The wireless communication system according to any one of claims 1 to 3, wherein
the cycle calculation unit
uses a unit power generation amount per unit time generated by the power generation unit, to calculate, as the first time period, a time period for increasing a power storage residual amount stored in the power storage unit to a first power storage amount.

[Claim 5]
The wireless communication system according to claim 4, wherein
the cycle calculation unit
uses the unit power generation amount to calculate a power generation amount to be generated in the first time period as a predicted power generation amount, and sets, as the available power amount, a value obtained by subtracting a minimum power amount to be consumed by each slave wireless device in the first time period, from a sum of the predicted power generation amount and the power storage residual amount.
[Claim 6]
The wireless communication system according to claim 4 or 5, wherein
the slave wireless device
comprises a power supply monitoring unit to transmit, to the master wireless device, notification power information including information on a power generation amount by the power generation unit, and
the cycle calculation unit
calculates a unit power generation amount per unit time generated by the power generation unit, based on information on a power generation amount included in the notification power information, and calculates the first time period based on the unit power generation amount.
[Claim 7]
The wireless communication system according to any one of claims 1 to 6, wherein

the cycle adjustment unit
determines to apply the common cycle to each slave wireless device of the plurality of slave wireless devices when the power storage residual amount is smaller than a first threshold value, and
determines not to apply the common cycle to each slave wireless device of the plurality of slave wireless devices when the power storage residual amount is larger than a second threshold value.
[Claim 8]
The wireless communication system according to any one of claims 1 to 6, wherein
the cycle adjustment unit:
determines whether or not the slave wireless device operates as a repeater; in a case of not operating as the repeater, determines to apply the common cycle to each slave wireless device of the plurality of slave wireless devices when the power storage residual amount is smaller than a first threshold value, and determines not to apply the common cycle to each slave wireless device of the plurality of slave wireless devices when the power storage residual amount is larger than a second threshold value; and in a case of operating as the repeater, determines to apply the common cycle to each slave wireless device of the plurality of slave wireless devices when the power storage residual amount is smaller than a third threshold value that is larger than the first threshold value, and determines not to apply the common cycle to each slave wireless device of the plurality of slave wireless devices when the power storage residual amount is larger than a fourth threshold value that is larger than the second threshold value.

The wireless communication system according to any one of claims 1 to 3, wherein
the master wireless device
comprises a storage unit to store information on a power generation amount by the power generation unit, for each slave wireless device of the plurality of slave wireless devices, and
the cycle calculation unit
calculates the first time period based on the information on a power generation amount.
[Claim 10]
The wireless communication system according to any one of claims 1 to 3, wherein
the slave wireless device
comprises a power supply monitoring unit to transmit, to the master wireless device, notification power information including information on a power generation amount by the power generation unit,
the master wireless device
comprises a storage unit to store information on a power generation amount by the power generation unit, for each slave wireless device of the plurality of slave wireless devices, and
the cycle calculation unit
calculates a unit power generation amount per unit time generated by the power generation unit, based on information on a power generation amount included in

the notification power information when the power storage residual amount is smaller than a fifth threshold value, calculates the first time period based on the unit power generation amount, and calculates the first time period based on the information on a power generation amount when the power storage residual amount is equal to or larger than a fifth threshold value.
[Claim 11]
The wireless communication system according to any one of claims 1 to 10, wherein
the cycle calculation unit
selects a largest calculation cycle among the plurality of calculation cycles as the common cycle.
[Claim 12]
The wireless communication system according to any one of claims 1 to 10, wherein
the cycle calculation unit
selects, as the common cycle, from among the plurality of calculation cycles, the calculation cycle for which a number of slave wireless devices corresponding to a calculation cycle larger than the calculation cycle is equal to or smaller than a certain number.
[Claim 13]
The wireless communication system according to any one of claims 1 to 10, wherein

the cycle calculation unit
selects a slave wireless device from the plurality of slave wireless devices based on a network topology of the wireless communication system, and selects, as the common cycle, a largest calculation cycle among calculation cycles of a selected slave wireless device.
[Claim 14]
The wireless communication system according to any one of claims 1 to 10, wherein
the cycle calculation unit
selects a slave wireless device connected to the master wireless device, from the plurality of slave wireless devices, and selects, as the common cycle, a largest calculation cycle among calculation cycles of a selected slave wireless device.
[Claim 15]
The wireless communication system according to any one of claims 1 to 6, wherein
the slave wireless device
comprises a power supply monitoring unit to transmit, to the master wireless device, notification power information including information on a power generation amount by the power generation unit, when the power storage residual amount is smaller than a sixth threshold value.
[Claim 16]
The wireless communication system according to claim 15, wherein the slave

wireless device adds the notification power information to a data packet, a control packet, or a relay packet to be relayed, and transmits to the master wireless device.
[Claim 17]
The wireless communication system according to claim 6, wherein
the cycle calculation unit:
stores the notification power information received from the slave wireless device in a storage unit; determines a connection state of the slave wireless device every time when receiving from the slave wireless device; and discards the notification power information when the slave wireless device is disconnected from the wireless communication system.
[Claim 18]
The wireless communication system according to any one of claims 1 to 6, wherein
the cycle adjustment unit
determines to apply the common cycle to each slave wireless device of the plurality of slave wireless devices, when the power storage residual amount is smaller than a power consumption amount in the first time period.
[Claim 19]
The wireless communication system according to any one of claims 1 to 6, wherein
the cycle adjustment unit
determines to apply the common cycle to each slave wireless device of the

plurality of slave wireless devices, when a sum of a predicted power generation amount to be generated in the first time period and the power storage residual amount is smaller than a power consumption amount in the first time period.
[Claim 20]
The wireless communication system according to any one of claims 1 to 19, wherein
the cycle calculation unit
calculates a power consumption amount in the first time period based on a number of connected wireless devices, the number being a number of slave wireless devices connected to the slave wireless devices, and based on a communication data amount of the slave wireless device.
[Claim 21]
A wireless communication method of a wireless communication system comprising a master wireless device and a plurality of slave wireless devices, the master wireless device and the plurality of slave wireless devices wirelessly communicating with each other, wherein
each slave wireless device of the plurality of slave wireless devices comprises a power generation unit to generate electric power, and a power storage unit to store electric power generated by the power generation unit,
a cycle calculation unit of the master wireless device: calculates, as an available power amount, for each slave wireless device of the plurality of slave wireless devices, a power amount that can be used by each slave wireless device in a first time period; calculates, as a calculation cycle, an intermittent operation cycle in which a

power consumption amount when each slave wireless device performs an intermittent operation for the first time period does not exceed the available power amount, the intermittent operation cycle being a cycle of the intermittent operation in which each slave wireless device operates and then sleeps; and selects, as a common cycle, a common calculation cycle to be applied to each slave wireless device of the plurality of slave wireless devices from a plurality of calculation cycles calculated for the plurality of slave wireless devices, and
a cycle adjustment unit of the master wireless device determines whether or not to apply the common cycle to each slave wireless device of the plurality of slave wireless devices, based on a power storage residual amount of a slave wireless device having the calculation cycle being selected as the common cycle.
[Claim 22]
A wireless communication program of a master wireless device to wirelessly communicate with a plurality of slave wireless devices, wherein
each slave wireless device of the plurality of slave wireless devices comprises a power generation unit to generate electric power, and a power storage unit to store electric power generated by the power generation unit,
the wireless communication program causing the master wireless device that is a computer to execute:
a cycle calculation process of: calculating, as an available power amount, for each slave wireless device of the plurality of slave wireless devices, a power amount that can be used by each slave wireless device in a first time period; calculating, as a calculation cycle, an intermittent operation cycle in which a power consumption amount when each slave wireless device performs an intermittent operation for the first time

period does not exceed the available power amount, the intermittent operation cycle being a cycle of the intermittent operation in which each slave wireless device operates and then sleeps; and selecting, as a common cycle, a common calculation cycle to be applied to each slave wireless device of the plurality of slave wireless devices from a plurality of calculation cycles calculated for the plurality of slave wireless devices; and
a cycle adjustment process of determining whether or not to apply the common cycle to each slave wireless device of the plurality of slave wireless devices, based on a power storage residual amount of a slave wireless device having the calculation cycle being selected as the common cycle.