Communication system, control device, and node device
First Claim
1. A wireless communication system comprising:
- a control device; and
a plurality of node devices, whereinthe control device includes;
a first receiver configured to be able to receive information simultaneously from a plurality of radio frequency channels;
a first processor thatjudges whether a first channel in the plurality of radio frequency channels is congested, andgenerates switchover instruction information to instruct at least one of the plurality of node devices to switch a transmission channel from the first channel to another channel, when the first channel is judged to be congested; and
a first transmitter that transmits the switchover instruction information, andeach of the plurality of node devices includes;
a second receiver that receives information from the control device or another node device through the first channel;
a second transmitter that transmits information addressed to the control device through a channel specified as the transmission channel in the plurality of radio frequency channels;
a memory that stores path information, transmission information or reception information; and
a second processor thatrecognizes whether a hop count from the control device is one based on identification information for identifying whether the hop count from the control device is one, the identification information being included in the path information, header information of the transmission information, header information of the reception information or the switchover instruction information,selects a second channel other than the first channel in a first case in which the second receiver receives the switchover instruction information from the control device and the hop count is recognized as one,specifies the second channel as the transmission channel for the second transmitter in the first case, andspecifies the first channel as the transmission channel for the second transmitter in a second case in which the first case does not hold.
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Accused Products
Abstract
A wireless communication system is provided. A control device includes: a receiver configured to be able to receive information from radio frequency channels; a processor that judges whether a first channel is congested, and generates switchover instruction information when the first channel is judged to be congested; and a transmitter that transmits the switchover instruction information. Each node device includes: a receiver that receives information through the first channel; a transmitter that transmits information through a transmission channel; and a processor that recognizes whether a hop count from the control device is one, selects a second channel and specifies it as the transmission channel in a first case in which the receiver receives the switchover instruction information from the control device and the hop count is recognized as one, and specifies the first channel as the transmission channel in a second case in which the first case does not hold.
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Citations
10 Claims
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1. A wireless communication system comprising:
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a control device; and a plurality of node devices, wherein the control device includes; a first receiver configured to be able to receive information simultaneously from a plurality of radio frequency channels; a first processor that judges whether a first channel in the plurality of radio frequency channels is congested, and generates switchover instruction information to instruct at least one of the plurality of node devices to switch a transmission channel from the first channel to another channel, when the first channel is judged to be congested; and a first transmitter that transmits the switchover instruction information, and each of the plurality of node devices includes; a second receiver that receives information from the control device or another node device through the first channel; a second transmitter that transmits information addressed to the control device through a channel specified as the transmission channel in the plurality of radio frequency channels; a memory that stores path information, transmission information or reception information; and a second processor that recognizes whether a hop count from the control device is one based on identification information for identifying whether the hop count from the control device is one, the identification information being included in the path information, header information of the transmission information, header information of the reception information or the switchover instruction information, selects a second channel other than the first channel in a first case in which the second receiver receives the switchover instruction information from the control device and the hop count is recognized as one, specifies the second channel as the transmission channel for the second transmitter in the first case, and specifies the first channel as the transmission channel for the second transmitter in a second case in which the first case does not hold. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A control device used in a wireless communication system including a plurality of node devices, the control device comprising:
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a receiver configured to be able to receive information simultaneously from a plurality of radio frequency channels; a processor that judges whether a first channel in the plurality of radio frequency channels is congested by using at least statistics information of time points at which the control device receives the information transmitted from the plurality of node devices or a combination of reception power in the control device and an error rate of the information transmitted from the plurality of node devices to the control device, and when judging that the first channel is congested, generates switchover instruction information for instructing one or more node devices whose hop count from the control device is one in the plurality of node devices to switch a transmission channel used in transmitting information to the control device from the first channel to a second channel; and a transmitter that transmits the switchover instruction information. - View Dependent Claims (9)
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10. A node device comprising:
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a receiver that receives information from a control device or another node device by wireless communication through a first channel; a transmitter that transmits information addressed to the control device through a channel specified as a transmission channel in a plurality of radio frequency channels including the first channel; a memory that stores path information, transmission information or reception information; and a processor that recognizes whether a hop count from the control device is one based on identification information for identifying whether the hop count from the control device is one, the identification information being included in the path information, header information of the transmission information, header information of the reception information or switchover instruction information for an instruction to switch the transmission channel from the first channel to another channel, selects a second channel other than the first channel for each transmission from the transmitter in a first case in which the hop count is recognized as one and the receiver receives, from the control device, the switchover instruction information, specifies the second channel as the transmission channel for the transmitter for each transmission from the transmitter in the first case, and specifies the first channel as the transmission channel for the transmitter in a second case in which the first case does not hold.
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Specification