JP5001024B2 - Wireless communication system and control method thereof - Google Patents

Description

  The present invention relates to a radio communication system having a plurality of communication apparatuses that use a plurality of radio channels in the same band and a control method thereof, and more specifically, in the same radio communication system generated by using the same radio channel during communication. The present invention relates to a radio communication system capable of reducing interference with other communication apparatuses and a control method thereof.

  When a plurality of communication devices simultaneously perform wireless communication in the same band, noise may occur due to interference with each other because the frequencies used overlap or are close to each other. Normally, when the noise level becomes high, control for switching the frequency to be used is performed.

  As a first conventional technique, there is a digital wireless communication apparatus that can realize stable wireless communication by setting an appropriate channel switching condition in the digital wireless communication apparatus that performs wireless communication with a base station. When this digital wireless communication device, for example, a cordless telephone handset, extracts a frame from a radio signal with a base station, for example, a base device, the frame error rate is calculated, a frame error has occurred, and the received signal strength is predetermined. Count the number of frames above the threshold. When the frame error rate is equal to or higher than a predetermined threshold and the counted number of frames is equal to or higher than the predetermined threshold, it is determined that the channel switching condition is satisfied, and the channel is switched (see, for example, Patent Document 1).

  As a second conventional technique, there is a communication system capable of performing wireless communication so that a plurality of communication terminal apparatuses using the same frequency band do not interfere with each other. In this communication system, when a communication terminal apparatus starts communication with a communication control apparatus connected to an external network, communication is performed by selecting a radio channel excluding the currently used radio channel. The communication control device transmits a used frequency table representing the used frequency to each communication terminal device. Each communication terminal device stores a priority channel table arranged in order of priority from a frequency with less noise, and when receiving a use frequency table from a communication control device, the priority order of radio channels used by other communication terminal devices Update the priority channel table to lower Each communication terminal apparatus can select a radio channel having a low noise frequency by selecting a radio channel based on the priority channel table. If the selected radio channel is already used by another communication terminal device, the radio channel with the next priority is selected (for example, see Patent Document 2).

  As a third conventional technique, there is a wireless communication system that can efficiently transmit data without receiving interference from other communication stations, that is, communication apparatuses, in an autonomous distributed communication environment. In this wireless communication system, each communication station broadcasts beacon information at a predetermined frame period on a single channel, thereby notifying other communication stations within the communication range of its own existence and configuring the network configuration. Notice. Each communication station collects information indicating the band usage status in the peripheral station based on the beacon information. Based on the collected information, it grasps the bandwidth that cannot be used at the local station and the bandwidth that can be used at the local station, and sets the band that is actually used at the local station. Notify information about unavailable bandwidth. The peripheral station that has received the notification further notifies the peripheral station of the information. The band in the third conventional technique is a slot obtained by dividing a frame at a predetermined time interval. As information about the use band and the unusable band of the own station, there is, for example, slot reservation. The reservation is to reserve a slot in advance for performing a specific communication such as data transmission, and data transmission can be performed in the slot without being interrupted by other stations. By notifying information indicating slots that may be reserved, that is, by notifying the advance notice of reservation, it is possible to prevent the same slot from being simultaneously reserved between different communication stations (for example, Patent Document 3). reference).

JP 2005-203898 A Japanese Patent Laid-Open No. 2003-249773 JP 2005-252645 A

  However, the first conventional technique switches channels by detecting an error rate or the like, and can be switched only when the error rate rises due to actual interference between channels. That is, there is a problem that it is not possible to reduce contention that different digital wireless communication apparatuses use the same channel at the same time. Furthermore, there is a problem that it is necessary to perform error detection in order to reduce interference.

  The second conventional technique selects a channel that is not used when performing communication, and cannot reduce contention in which a plurality of communication terminal devices attempt to use the same channel that is not used at the same time. There is a problem.

  In the third conventional technique, it is possible to avoid contention between a plurality of communication stations by making a reservation. However, since it is an autonomous distributed type, contention for reservation occurs and the contention is avoided. There is a problem that it is necessary to make a reservation notice, that is, a notice for exclusive control.

  An object of the present invention is to provide a radio communication system and a control method therefor that can reduce radio channel contention at the start of communication without performing error detection and without making a notice for exclusive control. It is.

The present invention provides a plurality of communication devices capable of communicating by any one of a plurality of communication methods in which at least a part of a frequency band for performing wireless communication overlaps,
Including a communication control device capable of communicating with the plurality of communication devices using the plurality of communication methods,
The communication control device includes:
A communication means capable of communicating with each communication method;
Correspondence information for associating a predetermined wireless channel for each communication method with a common wireless channel managed in common by a plurality of communication methods, and each communication method can be set for each common wireless channel, and use restrictions on the common wireless channel Storage means for storing usage restriction information representing;
When communicating with a communication device, the communication method of the communication device is selected according to the use restriction indicated by the use restriction information stored in the storage means, and one of the plurality of common radio channels is selected to perform the communication. Control means for performing communication by the communication means on the wireless channel associated with the selected common wireless channel according to the correspondence information stored in the storage means among the wireless channels of the communication method used by the communication device, A wireless communication system.

  According to the present invention, a plurality of communication apparatuses capable of communicating in any one of a plurality of communication systems in which at least a part of a frequency band for performing wireless communication overlaps, and the plurality of communication systems When communication is performed with the communication control device that can communicate with the plurality of communication devices, the communication control device performs communication in each communication method by the communication unit, and the storage unit determines in advance for each communication method. Correspondence information for associating a radio channel with a common radio channel managed in common by a plurality of communication methods, and use restriction information that can be set for each common radio channel for each communication method and that indicates use restrictions of the common radio channel are stored. Is done. Then, when communicating with the communication device by the control means, one of the plurality of common radio channels is selected according to the use restriction indicated by the use restriction information stored in the storage means for the communication method of the communication apparatus. Since communication is performed by the communication unit using the wireless channel associated with the selected common wireless channel based on the correspondence information stored in the storage unit among the wireless channels of the communication scheme used by the communication apparatus performing the communication. Exclusive control can be performed based on usage restrictions set for a common wireless channel for managing wireless channels with different methods in common, without error detection and without notice for exclusive control Therefore, it is possible to reduce radio channel contention at the start of communication.

Further, the present invention includes the dedicated channel information indicating that the use restriction information is a common radio channel that can be used only in any one of the plurality of communication methods,
When the control unit selects a common radio channel for the communication method of the communication device that performs the communication, and the dedicated channel information is set in the storage unit for the communication method other than the communication method of the communication device that performs the communication, One common radio channel is selected from the common radio channels excluding the common radio channel indicated by the dedicated channel information.

  According to the present invention, the use restriction information includes dedicated channel information indicating that the use restriction information is a common radio channel that can be used only in any one of the plurality of communication methods, and the control means When a common wireless channel is selected for the communication method of the communication device that performs the communication, if the dedicated channel information is set in the storage unit for the communication method other than the communication method of the communication device that performs the communication, the dedicated channel Since one common radio channel is selected from the common radio channels excluding the common radio channel indicated by the information, only the communication device of the communication method of the common radio channel for which the dedicated channel information is set is used for the common radio channel. Can be used.

Further, the present invention includes the priority channel information indicating that the use restriction information is a common radio channel that can be used with priority over any one of the plurality of communication schemes,
When the control unit selects a common radio channel for the communication method of the communication device that performs the communication, when the priority channel information is set in the storage unit for the communication method other than the communication method of the communication device that performs the communication,
If the usage rate using the common radio channel to be selected is less than a predetermined reference usage rate, one common radio channel is selected from the common radio channels including the common radio channel indicated by the priority channel information,
When the usage rate is equal to or higher than a predetermined reference usage rate, one common radio channel is selected from the common radio channels excluding the common radio channel indicated by the priority channel information.

  According to the present invention, the use restriction information includes priority channel information representing a common radio channel that can be used with priority over any one of the plurality of communication methods, When the common wireless channel is selected for the communication method of the communication device that performs the communication by the control unit, when the priority channel information is set in the storage unit for the communication method other than the communication method of the communication device that performs the communication, When the usage rate using the common radio channel to be selected is less than a predetermined reference usage rate, one common radio channel is selected from the common radio channels including the common radio channel indicated by the priority channel information, and the usage rate is selected. Is equal to or higher than a predetermined reference usage rate, a common radio channel is selected from the common radio channels excluding the common radio channel indicated by the priority channel information. Since one channel is selected, the usage rate of the common radio channel indicated by the priority channel information is suppressed below a certain usage rate, and the communication device of the communication method of the common radio channel in which the priority channel information is set is A common radio channel can be used.

In the present invention, the use restriction information includes reserved channel information indicating a common radio channel reserved for use in any one of the plurality of communication methods,
When the control unit selects a common radio channel for the communication method of the communication device that performs the communication, when reserved channel information is set in the storage unit for a communication method other than the communication method of the communication device that performs the communication,
When communication is performed on a radio channel corresponding to the common radio channel indicated by the reserved channel information, one common radio channel is selected from the common radio channels excluding the common radio channel indicated by the reserved channel information,
When communication is not performed on a radio channel corresponding to the common radio channel indicated by the reserved channel information, one common radio channel is selected from the common radio channels including the common radio channel indicated by the reserved channel information. To do.

  According to the present invention, the use restriction information includes reserved channel information indicating a common radio channel reserved for use in any one of the plurality of communication methods, and the control When a common radio channel is selected for the communication method of the communication device that performs the communication, the reservation channel information for the communication method other than the communication method of the communication device that performs the communication is set in the storage unit. When communication is performed using a radio channel corresponding to the common radio channel indicated by the channel information, one common radio channel is selected from the common radio channels excluding the common radio channel indicated by the reserved channel information. When communication is not being performed on a radio channel corresponding to the common radio channel indicated, the common radio channel indicated by the reserved channel information is displayed. Since one common radio channel is selected from the common radio channels including the reserved channel information, the reserved channel information is set if communication is not performed on the radio channel corresponding to the common radio channel for which the reserved channel information is set. A communication device other than the common wireless channel communication method can also use the common wireless channel.

  Further, in the present invention, the control unit is configured such that the first communication device which is a communication device that performs communication using a communication method other than the communication method in which the reserved channel information is set in the storage unit, When a second communication device, which is a communication device that performs communication using a communication method in which the reserved channel information is set in a storage unit, performs communication during a period in which communication is performed using a wireless channel corresponding to the channel, the reservation is performed. Select one common radio channel from the common radio channels excluding the common radio channel indicated by the channel information, and communicate the radio channel with which the first communication device is communicating with the radio channel corresponding to the selected common radio channel It is characterized by being switched by means.

  According to the present invention, the first communication device, which is a communication device that performs communication by a communication method other than the communication method in which the reserved channel information is set in the storage device, is shared by the control unit. When a second communication device, which is a communication device that performs communication in a communication method in which the reserved channel information is set in a storage unit, performs communication during a period in which communication is performed on a wireless channel corresponding to a wireless channel, A radio channel corresponding to the selected common radio channel is selected as one common radio channel from among the common radio channels excluding the common radio channel indicated by the reserved channel information, and the first communication device is communicating. The communication device of the communication method excluding the communication method of the common radio channel in which the reserved channel information is set is Even if communication is performed on a radio channel corresponding to a common radio channel for which reserved channel information is set, when a communication device of the common radio channel communication method for which reserved channel information is set attempts to communicate, A common wireless channel on which communication is performed can be hopped and handed over.

In the present invention, the use restriction information may be a common radio channel in which dedicated channel information, priority channel information, and reserved channel information are not set in any of the plurality of communication methods. Including channel information,
When the open channel information is set in the storage unit when the common radio channel is selected for the communication method of the communication apparatus that performs the communication, the control unit sets the common radio channel including the common radio channel indicated by the open channel information. One common wireless channel is selected from among them.

  According to the present invention, the use restriction information represents a common radio channel in which dedicated channel information, priority channel information, and reserved channel information are not set in any of the plurality of communication methods. When open radio channel information is set in the storage means when the control means selects a common radio channel for the communication method of the communication device that performs communication, the common radio indicated by the open channel information is included. Since one common radio channel is selected from the common radio channels including the channel, the communication apparatus of any communication system can be used as the common radio channel for which the open channel information is set.

In the present invention, the use restriction information includes prohibited channel information indicating that the communication channel is a common radio channel that is not associated with each communication method,
When the control unit selects a common radio channel for the communication method of the communication device that performs the communication, and the prohibited channel information is set in the storage unit for the communication method of the communication device that performs the communication, the prohibited channel information is One common radio channel is selected from the common radio channels excluding the common radio channel shown.

  According to the present invention, the use restriction information includes forbidden channel information indicating a common radio channel that is not associated with a radio channel for each communication method, and communication by a communication device that performs the communication by the control unit. When a prohibited radio channel information is set in the storage means for the communication scheme of the communication apparatus that performs the communication when a common radio channel is selected for the scheme, the common radio channel except the common radio channel indicated by the prohibited channel information is selected. Since one common radio channel is selected, a communication apparatus using a common radio channel communication scheme in which prohibited channel information is set does not use the common radio channel.

In addition, the present invention provides a plurality of communication devices capable of communicating in any one of a plurality of communication methods in which at least a part of a frequency band for performing wireless communication overlaps,
A communication unit capable of communicating with the plurality of communication devices using the plurality of communication methods, and correspondence information for associating a predetermined wireless channel for each communication method with a common wireless channel managed in common by the plurality of communication methods; and A control method for a radio communication system including a communication control device having a storage unit that stores use restriction information that can be set for each common radio channel for each communication method and represents use restriction of the common radio channel,
When communicating with a communication device, the communication method of the communication device is selected according to the use restriction indicated by the use restriction information stored in the storage unit, and one of the plurality of common radio channels is selected to perform the communication. A wireless communication system control method, wherein communication is performed by a communication unit using a wireless channel associated with a selected common wireless channel among wireless channels of a communication method used by a communication device.

  According to the present invention, a plurality of communication apparatuses capable of communicating in any one of a plurality of communication systems in which at least a part of a frequency band for performing wireless communication overlaps, and the plurality of communication systems A communication unit capable of communicating with the plurality of communication devices, correspondence information for associating a predetermined wireless channel for each communication method with a common wireless channel managed in common by the plurality of communication methods, and a common wireless for each communication method When controlling a wireless communication system including a communication control device having a storage unit that stores use restriction information indicating use restriction information that can be set for each channel and that indicates use restriction of a common wireless channel, the communication is performed when communicating with the communication device. One of the plurality of common radio channels according to the use restriction indicated by the use restriction information stored in the storage unit for the communication method of the device Since communication is performed by the communication unit using a radio channel associated with the selected common radio channel among the radio channels of the communication method used by the communication device that selects and performs the communication, radio channels with different communication methods are managed in common Exclusive control based on the use restriction set for the common wireless channel for the wireless channel contention at the start of communication without error detection and without notice for exclusive control. Can be reduced.

  According to the present invention, it is possible to perform exclusive control based on use restrictions set for a common wireless channel for commonly managing wireless channels with different communication methods, and without performing error detection and performing exclusive control. Therefore, it is possible to reduce radio channel contention at the start of communication without giving a notice for the purpose. Therefore, it is possible to reduce interference between a plurality of communication apparatuses that operate independently in a plurality of communication schemes in which frequency bands for performing wireless communication overlap.

  Further, according to the present invention, only the communication device of the communication system of the common radio channel for which the dedicated channel information is set can use the common radio channel, so that it is possible to avoid contention on the common radio channel. it can.

  Further, according to the present invention, the usage rate of the common radio channel indicated by the priority channel information is suppressed below a certain usage rate, and the communication device of the communication method of the common radio channel in which the priority channel information is set is the common radio channel. Since channels can be used, radio channels that do not compete with each other even when communication is congested can be selected.

  According to the present invention, if communication is not performed on a radio channel corresponding to a common radio channel for which reserved channel information is set, a communication method other than the communication method for the common radio channel for which reserved channel information is set Can also use the common wireless channel. Therefore, radio channels that are not being used can be used effectively, and the operating rate of the radio channel when communication is busy can be increased.

  Further, according to the present invention, a communication apparatus having a communication method other than the communication method of the common radio channel for which reserved channel information is set can communicate with the radio channel corresponding to the common radio channel for which the reserved channel information is set. Even when the communication device of the common radio channel communication system in which the reserved channel information is set tries to perform communication, the common radio channel in which the communication is performed can be hopped and surrendered. Therefore, a communication device that has made a reservation can immediately use the common radio channel without competing even if a communication device of another communication method uses the common radio channel for which the reservation has been made. it can.

  Further, according to the present invention, since the common radio channel in which the open channel information is set can be used by any communication system communication apparatus, the common radio channel is set to a shared radio channel in which interference is unlikely to occur. Can be reduced.

  Further, according to the present invention, the communication device of the communication system of the common radio channel in which the prohibited channel information is set does not use the common radio channel, so that the prohibited channel information is included in the common radio channel where interference is likely to occur. By setting, interference can be reduced.

  Further, according to the present invention, exclusive control can be performed based on the use restriction set in the common radio channel for commonly managing radio channels having different communication methods, and error detection is not performed and exclusive control is performed. The contention of the radio channel at the start of communication can be reduced without giving a notice for the purpose. Therefore, when the control method according to the present invention is applied, it is possible to reduce interference between a plurality of communication apparatuses that operate independently in a plurality of communication schemes in which frequency bands for performing wireless communication overlap.

  FIG. 1 shows a schematic configuration of a multifunction machine 1 according to an embodiment of the present invention. A multifunction device 1 that is a wireless communication system is, for example, a multifunction device having a facsimile function, and a main body 10 that is a communication control device, and a plurality of communication devices such as a Bluetooth (Bluetooth) terminal 20 and a wireless LAN (Local Area Network) terminal. 30 and a digital cordless handset 40. The control method of the wireless communication system according to the present invention is processed by the multifunction device 1.

  The main body 10 is connected to a communication line 50, and performs wireless communication with the Bluetooth terminal 20, the wireless LAN terminal 30, and the digital cordless handset 40 using different communication methods, which will be described later. The Bluetooth terminal 20, the wireless LAN terminal 30, and the digital cordless handset 40 can communicate with other devices connected to the communication line 50 via the main body 10 and the communication line 50. In FIG. 1, one Bluetooth terminal 20, one wireless LAN terminal 30, and one digital cordless handset 40 are shown, but all of them are not limited to one and may be a plurality.

  The main body 10 includes a CPU (Central Processing Unit) 11, a used channel flash (flash) memory 12, a used channel ROM (Read Only Memory) 13, a Bluetooth controller 14, a Bluetooth module 15, a wireless LAN controller 16, a wireless LAN tuner 17, and a DSP. (Digital Signal Processor) 18, a digital slave unit tuner 19, and a storage device (not shown). The CPU 11 controls the Bluetooth controller 14, the wireless LAN controller 16, the DSP 18, and the like by executing a program stored in a storage device (not shown) such as a ROM or a RAM (Random Access Memory), and is connected to the communication line 50. Communication with the other device, the Bluetooth terminal 20, the wireless LAN terminal 30, and the digital cordless handset 40.

  The use channel flash memory 12 is a use channel table 71 for managing the use restriction and use of control channels, which will be described later, used when the Bluetooth terminal 20, the wireless LAN terminal 30, and the digital cordless handset 40 communicate. For example, a flash memory. The used channel table 71 is read and written by the CPU 11. The use channel ROM 13 is a storage device for storing information such as an initial setting table in which use restrictions are set in advance, for example, at the time of shipment from the factory, and a conversion table 70 to be described later. The initial setting table is read by the CPU 11 in the initial setting process of the main body 10, and the contents of the initial setting table are reflected in the used channel table 71 of the used channel flash memory 12.

The Bluetooth controller 14 controls the Bluetooth module 15 so as to communicate via a wireless channel instructed by the CPU 11. The Bluetooth module 15 communicates with the Bluetooth terminal 20 using a wireless channel instructed by the Bluetooth controller 14 by a communication method based on the Bluetooth standard, which is a short-range wireless communication standard. The wireless LAN controller 16 controls the wireless LAN tuner 17 so as to communicate using a wireless channel instructed by the CPU 11. The wireless LAN tuner 17 is a wireless LAN communication standard such as IEEE (Institute of Electrical and
Electronic Engineers) communicate with the wireless LAN terminal 30 using a wireless channel instructed by the wireless LAN controller 16 by a communication method based on the 802.11b standard. The DSP 18 controls the digital slave unit tuner 19 so as to communicate through a wireless channel instructed by the CPU 11. The digital cordless handset tuner 19 communicates with the digital cordless cordless handset 40 using a radio channel instructed by the DSP 18 by a communication method based on a cordless telephone communication standard.

  The Bluetooth terminal 20 is, for example, a personal computer having a Bluetooth communication function, and wirelessly communicates with the main body 10 using a communication method based on the Bluetooth standard. The wireless LAN terminal 30 is a personal computer having a communication function according to a wireless LAN communication standard such as the IEEE 802.11b standard, and wirelessly communicates with the main body 10 using the IEEE 802.11b standard. The digital cordless handset 40 is a handset of a digital cordless telephone, for example, and wirelessly communicates with the main body 10 using a communication method according to the communication standard of the cordless telephone.

  FIG. 2 shows a cordless radio channel table 60 used by the DSP 18 shown in FIG. The cordless wireless channel table 60 shown in FIG. 2 divides the 2.4 GHz band frequency according to the communication standard of the cordless telephone into the center frequency, that is, the center frequency from 2400 MHz to 2 MHz, and the bandwidth to 2 MHz. . 1-No. This is associated with 40 radio channels up to 40.

  FIG. 3 shows a wireless LAN channel table 61 used by the wireless LAN controller 16 shown in FIG. The wireless LAN channel table 61 shown in FIG. 3 divides the 2.4 GHz band frequency according to the IEEE802.11b standard into a center frequency of 2412 MHz to 5 MHz and a bandwidth of 22 MHz. 1-No. This is associated with 14 wireless channels up to 14. For example, channel No. One radio channel has a center frequency of 2412 MHz, a lower limit frequency of 2401 MHz, and an upper limit frequency of 2423 MHz.

  FIG. 4 shows a Bluetooth radio channel table 62 used by the Bluetooth controller 14 shown in FIG. The Bluetooth radio channel table 62 shown in FIG. 4 divides a 2.4 GHz band frequency according to the Bluetooth standard into a center frequency, that is, a center frequency from 2402 MHz to 1 MHz and a bandwidth of 1 MHz. 1-No. This is associated with 79 radio channels up to 79.

  As described above, the communication method based on the Bluetooth standard, the wireless LAN standard, for example, the communication method based on the IEEE802.11b standard, and the communication method based on the communication standard for the cordless telephone are all communication methods for performing wireless communication at a frequency of 2.4 GHz band. These communication methods have overlapping frequency ranges.

  FIG. 5 shows an example of the conversion table 70 used by the main body 10 shown in FIG. The conversion table 70 is a table used for performing exclusive control between these different communication methods, and is stored in the use channel ROM 13. The conversion table 70 associates the radio channel of each communication method with each control channel that is a common radio channel. The control channel shown in FIG. 5 is a channel to which each frequency band obtained by dividing a 2.4 GHz band frequency by dividing the center frequency by 2402.5 MHz to 5 MHz and dividing the bandwidth by 5 MHz is assigned.

  For the communication method according to the communication standard of the cordless telephone, the control channel No. 1 to channel No. 1 to 3 radio channels, control channel No. 2 shows the channel number. 4 to 6 radio channels, control channel No. 3 is channel No. 7 and 8 radio channels, control channel No. 4 shows the channel number. 9 to 11 radio channels, control channel No. 5 is the channel number. No. 12, 13 radio channel, control channel No. 6 shows the channel number. 14 to 16 radio channels are associated with each other.

  For the communication system based on the wireless LAN standard, the control channel No. No radio channels are associated with control channels No. 1 and 2; 3 is channel No. 1 radio channel, control channel No. 1 4 shows the channel number. 2 radio channel, control channel No. 5 is the channel number. 3 radio channel, control channel no. 6 shows the channel number. Four radio channels are associated.

  As for the communication system based on the Bluetooth standard, the control channel No. 1 to channel No. 1 to 4 radio channels, control channel Nos. 2 shows the channel number. No. 5-9 radio channels, control channel No. 3 is channel No. 10 to 14 radio channels, control channel No. 4 shows the channel number. Radio channels 15 to 19, control channel No. 5 is the channel number. 20 to 24 radio channels, control channel No. 6 shows the channel number. 25 to 29 radio channels are associated.

  FIG. 6 shows an example of the used channel table 71 used by the main body 10 shown in FIG. The use channel table 71 is a table stored in the use channel flash memory 12, and a use restriction is set for each control channel for each communication method.

  The usage restrictions include, for example, usage restrictions of “exclusive”, “priority”, “reservation”, “release”, “prohibition”, and “in use”. A control channel of a communication method for which “exclusive” is set can use the control channel, that is, communicate on the control channel only to a communication device of that communication method. A control channel of a communication method for which “priority” is set can be used preferentially by a communication device of that communication method when communication is busy. For example, the percentage of the value obtained by dividing the number of times that a communication device other than the communication method of the target communication device hops to the control channel that the target communication device intends to use is divided by the total number of hops. ), A communication apparatus with a communication method other than the communication method for which “priority” is set has a predetermined usage rate of the control channel of the communication method for which “priority” is set, for example, less than 5%. In some cases, the control channel can be used. However, if the usage rate of the control channel is, for example, 5% or more, it is determined that communication is busy and the control channel cannot be used.

  The control channel of the communication method for which “reservation” is set indicates that the use of the communication apparatus of the communication method for which “reservation” is set is reserved. A communication apparatus with a communication method other than the communication method for which “reservation” is set can use the control channel when the control channel for which “reservation” is set is not used. A communication device with a communication method set to "Reserve" when a communication device with a communication method other than the communication method with "Reserve" is using a control channel with "Reserve" When a new communication is performed, a communication device using a control channel for which “reservation” is set hops to a control channel other than the control channel for which “reservation” is set, and performs a new communication Give up the control channel for which “reservation” is set in the communication device.

  “Open” indicates that “exclusive”, “priority”, and “reservation” are not set for any communication method. Therefore, the communication channel of any communication method can be used for the control channel for which “open” is set. This indicates that a communication apparatus of a communication method for which “prohibited” is set cannot use a control channel for which “prohibited” is set. “In use” indicates that a control channel of a communication method for which “in use” is set is being used by a communication apparatus of the communication method, that is, performing communication. When a control channel that is set to "Dedicated", "Priority", "Reservation", or "Release" is in use, "Dedicated use", "Preferential use", and "Reservation" are used until the use ends. It is set to “in use” or “open use”.

  Usage restrictions such as “exclusive”, “priority”, “reservation”, “release”, and “prohibition” are set in an initial setting table stored in the use channel ROM 13 at the time of factory shipment. Initial setting stored in the use channel ROM 13 in the initial setting process that is executed when the power is turned on for the first time after shipment from the factory or when an initial setting instruction is given by an input device (not shown) such as an operation panel. Information on the use restriction set in the table is read and reflected in the use channel table 71 of the use channel flash memory 12. The CPU 11 manages the used channel table 71 stored in the used channel flash memory 12, and performs exclusive control of the radio channel based on the used channel table 71. Use restrictions such as “exclusive”, “priority”, “reservation”, “release”, and “prohibition” set in the use channel table 71 may be set and changed by an input device (not shown). The use restriction may be set and changed depending on the program to be executed. If the total number of control channels for which “exclusive”, “priority”, and “reservation” can be set is suppressed to ½ or less of the total number of control channels, the influence of the number of settings can be reduced.

  In FIG. In “1”, “prohibited” is set for the communication method based on the wireless LAN standard, and “reservation” is set for the communication method based on the Bluetooth standard. Control channel No. In “2”, “in use” is set for the communication method based on the communication standard of the cordless telephone, and “prohibited” is set for the communication method based on the wireless LAN standard. Control channel No. 3, “Proprietary” is set for the communication system based on the wireless LAN standard. Control channel No. In “4”, “priority” is set for the communication method according to the communication standard of the cordless telephone. Control channel No. In “5”, “open” is set for any communication method. Control channel No. No use restriction is set for any communication method.

  FIG. 7 is an example of a flowchart showing a radio channel control process performed by the main body 10 shown in FIG. This flowchart is processed by the CPU 11, the power is turned on to the main body 10, the initial setting process is performed, and then the process proceeds to step S1.

  In step S <b> 1, it is determined whether or not communication has been completed in any of the communication devices. If communication is completed in any of the communication devices, the process proceeds to step S11. If communication is not completed in any of the communication devices, the process proceeds to step S2. In step S2, it is determined whether there is a communication start request from any of the communication devices. If there is a communication start request from any communication device, the process proceeds to step S3, and if there is no communication start request from any communication device, the process returns to step S1.

  In step S3, one control channel is selected from the control channels shown in the conversion table 70 for the communication apparatus that has made a communication start request. For example, immediately after the power is turned on, the control channel No. Selects the control channel of “1”, and thereafter, the communication device that requested the communication start selects the control channel next to the control channel used last time.

  In step S4, with reference to the used channel table 71 stored in the used channel flash memory 12, “exclusive” is selected for the communication method except the communication method of the communication device for which the selected control channel is requested to start communication. Determine whether it is set. If “exclusive” is set, the process proceeds to step S9. Although not shown in the flowchart shown in FIG. 7, if “exclusive” is not set, “inhibited” is set for the communication method of the communication device for which the selected control channel is requested to start communication. It is determined whether or not. If “prohibited” is set, the process proceeds to step S9. If “prohibited” is not set, the process proceeds to step S5.

  In step S5, with reference to the use channel table 71, it is determined whether or not “priority” is set for the communication method other than the communication method of the communication device for which the selected control channel is requested to start communication. . If “priority” is set, the process proceeds to step S12. If “priority” is not set, the process proceeds to step S6.

  In step S6, it is determined whether or not the selected control channel is in use. If “in use” is set in any communication method for the selected control channel, it is determined that the control channel is in use, and the process proceeds to step S7. Otherwise, it is determined that the control channel is not in use, and the process proceeds to step S13. In step S7, with reference to the used channel table 71, it is determined whether or not “reserved” is set for the communication method other than the communication method of the communication device for which the selected control channel is requested to start communication. . If “reservation” is set, the process proceeds to step S12. If “reservation” is not set, the process proceeds to step S8.

  In step S8, with reference to the used channel table 71, it is determined whether or not “reserved” is set for the communication method of the communication apparatus for which the selected control channel is requested to start communication. If “reservation” is set, the process proceeds to step S13. If “reservation” is not set, the process proceeds to step S9. In step S9, it is determined whether all the control channels shown in the conversion table 70 have been selected at least once. If all the control channels have been selected at least once, the process proceeds to step S14. If all the control channels have not been selected at least once, the process proceeds to step S10.

  In step S10, one next control channel is selected from the control channels shown in the conversion table 70, and the process returns to step S4. For example, the following control channel No. Control channel is selected, and the process returns to step S4. In step S11, the channel restriction is canceled, that is, the setting of “in use” of the used control channel is canceled, and the process returns to step S1. In step S12, it is determined whether the usage rate of the selected control channel is less than 5%. The usage rate is the percentage obtained by dividing the number of hops to the selected control channel by the communication device other than the communication method of the communication device that requested the communication start, divided by all the hopping times. is there. If the usage rate is less than 5%, the process proceeds to step S13. If the usage rate is not less than 5%, the process proceeds to step S9.

  In step S13, the communication apparatus that has made the communication start request starts communication on the radio channel corresponding to the selected control channel, and the process returns to step S1. Specifically, an instruction is given to the part corresponding to the communication method of the communication apparatus that requested communication start among the Bluetooth controller 14, the wireless LAN controller 16, or the DSP 18, so as to communicate with the wireless channel corresponding to the selected control channel. To do. In other words, if the communication method of the communication device that has requested communication start is a communication method according to the Bluetooth standard, the Bluetooth controller 14 is instructed, and the communication method of the communication device that has requested communication start is the communication method according to the wireless LAN standard. The wireless LAN controller 16 is instructed, and the DSP 18 is instructed that the communication method of the communication apparatus that has requested communication start is the communication method according to the communication standard of the cordless telephone. The Bluetooth controller 14 controls the Bluetooth module 15 so as to perform communication using any one of the designated wireless channels. The wireless LAN controller 16 controls the wireless LAN tuner 17 so as to perform communication using any one of the designated wireless channels. The DSP 18 controls the digital slave unit tuner 19 so as to perform communication on any one of the designated radio channels. Further, among the control channels of the used channel table 71 stored in the used channel flash memory 12, “in use” is set in the selected control channel for the communication method of the communication apparatus that has requested communication start, and step S1. Return to.

  In step S14, it is determined whether or not the use of any control channel has ended. When the use of any control channel ends, the process proceeds to step S15. When the use of any control channel does not end, the process returns to step S14 and waits for the end of use of any control channel. In step S15, the control channel that has been used is selected, and the process returns to step S4.

  FIG. 8 is a flowchart showing a reservation channel release process performed by the main body 10 shown in FIG. This flowchart shows a reservation channel release process as a process for each communication method among the processes related to the use restriction, and is processed by the CPU 11. The reservation channel release process is a process performed in parallel with the process of monitoring the communication end and the communication start shown in FIG. 7, that is, the process of step S1 and step S2. The main body 10 is turned on, and after the initial setting process, the process proceeds to step T1. Alternatively, when there is no communication start in step S2 shown in FIG. 7, this reservation channel release process may be executed before returning from step S2 to step S1.

  In step T1, the used channel table 71 stored in the used channel flash memory 12 is read, and the set use restrictions are confirmed. In step T2, it is determined whether there is a control channel for which “in use” is set for the wireless LAN communication method. If there is a control channel for which “in use” is set for the wireless LAN communication method, the process proceeds to step T3. If there is no control channel for which “in use” is set for the wireless LAN communication method, the process proceeds to step T7. move on.

  In step T3, if there is a control channel for which “reservation” is set for the communication method of the wireless LAN, the control channel for which “reservation” is set is assigned to another communication method so that the wireless LAN is given priority. Start usage restrictions. For use restriction, for example, use restriction information indicating for each control channel which communication method is restricted for use is set in the use channel flash memory when starting use restriction, and the use restriction information is referred to. Thus, it can be determined whether or not the use restriction is performed. If the use restriction for another communication method has already been started, the process proceeds to step T4 without doing anything.

  In step T4, if there is a reserved channel having a use restriction, that is, a Bluetooth terminal 20 and / or a digital cordless handset 40 using a control channel set to “reserved in use” for the wireless LAN communication method, The Bluetooth controller 14 and / or the DSP 18 are instructed to hop the Bluetooth terminal 20 and / or the digital cordless handset 40 that is using the control channel. When the control channel to be instructed for hopping is selected, the control channel is selected from the control channels other than the reserved control channel according to the processes in steps S3 to S15 of the radio channel control process shown in FIG.

  In step T5, it is determined whether or not the communication of the wireless LAN terminal 30 has been completed. When the communication of the wireless LAN terminal 30 is completed, the process proceeds to step T6, and when the communication of the wireless LAN terminal 30 is not completed, the process proceeds to step T7. In step T6, the restriction of the control channel of the wireless LAN communication method for which communication has ended is released, that is, the setting of the use restriction information is released, and the process proceeds to step T7.

  In step T7, it is determined whether or not there is a control channel for which “in use” is set for the communication method of the cordless telephone. If there is a control channel for which “in use” is set for the communication method of the cordless telephone, the process proceeds to step T8, and if there is no control channel for which “in use” is set for the communication method of the cordless telephone, the process proceeds to step T12. move on.

  In step T8, if there is a control channel for which "reservation" is set for the communication method of the cordless telephone, another communication method is given to give priority to the digital slave unit for the control channel for which "reservation" is set. Begin usage restrictions on. If the use restriction for another communication method has already been started, the process proceeds to step T9 without doing anything.

  In step T9, if there is a reserved channel having a use restriction, that is, a Bluetooth terminal 20 and / or a wireless LAN terminal 30 that uses a control channel set to “reserved in use” for the communication method of the cordless telephone, The Bluetooth controller 14 and / or the wireless LAN controller 16 are instructed to hop the Bluetooth terminal 20 and / or the wireless LAN terminal 30 that are using the control channel. When a control channel to be instructed for hopping is selected, control channels other than the control channel being used for reservation are selected according to the radio channel control process shown in FIG.

  In step T10, it is determined whether or not the communication of the digital cordless handset 40 has been completed. If the communication of the digital cordless handset 40 is completed, the process proceeds to step T11. If the communication of the digital cordless handset 40 is not completed, the process proceeds to step T12. In step T11, the restriction on the control channel of the digital cordless communication method for which communication has been terminated is released, and the process proceeds to step T12.

  In step T12, it is determined whether there is a control channel for which “in use” is set for the Bluetooth communication method. If there is a control channel for which “in use” is set for the Bluetooth communication method, the process proceeds to step T13. If there is no control channel for which “in use” is set for the Bluetooth communication method, the process returns to step T1.

  In step T13, if there is a control channel for which “reservation” is set for the communication method of Bluetooth, use restrictions on other communication methods so that Bluetooth is given priority for the control channel for which “reservation” is set. To start. If the use restriction for another communication method has already been started, the process proceeds to step T14 without doing anything.

  In Step T14, if there is a wireless LAN terminal 30 and / or a digital cordless handset 40 that uses a reserved channel that is restricted in use, that is, a control channel that is set to “reserved in use” for the Bluetooth communication method, The wireless LAN controller 16 and / or the DSP 18 are instructed to hop the wireless LAN terminal 30 and / or the digital cordless handset 40 that is using the control channel. When a control channel to be instructed for hopping is selected, control channels other than the control channel being used for reservation are selected according to the radio channel control process shown in FIG.

  In step T15, it is determined whether or not the communication of the Bluetooth terminal 20 has been completed. When the communication of the Bluetooth terminal 20 is completed, the process proceeds to step T16, and when the communication of the Bluetooth terminal 20 is not completed, the process returns to step T1. In step T16, the restriction on the control channel of the Bluetooth communication method for which communication has ended is released, and the process returns to step T1.

  In this way, using a plurality of communication devices capable of communicating in any one of a plurality of communication methods in which at least a part of a frequency band for performing wireless communication overlaps, and the plurality of communication methods When the communication control device capable of communicating with the plurality of communication devices performs communication, the communication control device includes communication means such as a Bluetooth controller 14, a Bluetooth module 15, a wireless LAN controller 16, a wireless LAN tuner 17, a DSP 18, In addition, communication is performed by each communication method by the digital slave unit tuner 19 and is commonly managed by a predetermined wireless channel and a plurality of communication methods for each communication method by, for example, the use channel flash memory 12 and the use channel ROM 13 which are storage means. Compatible with common wireless channels Kicking correspondence information in which for example the conversion table 70 and for example using channel table 71 which is use restriction information indicating a use restriction of a common radio channel be configurable for each common radio channel for each communication method, it is stored. Then, when communicating with the communication device, for example, by the CPU 11 as the control means, the communication method of the communication device is selected from among the plurality of common radio channels according to the use restriction indicated by the use restriction information stored in the storage means. Of the wireless channels of the communication method used by the communication device that performs the communication, the communication unit communicates with the wireless channel associated with the selected common wireless channel according to the correspondence information stored in the storage unit. Therefore, exclusive control can be performed based on the use restrictions set for the common wireless channel for managing wireless channels with different communication methods in common, without error detection, and for advance notice for exclusive control. It is possible to reduce radio channel contention at the start of communication without performing. Therefore, it is possible to reduce interference between a plurality of communication apparatuses that operate independently in a plurality of communication schemes in which frequency bands for performing wireless communication overlap.

  Further, the use restriction information includes, for example, “exclusive” which is exclusive channel information indicating that the use restriction information is a common radio channel that can be used only in any one of the plurality of communication methods. When the common wireless channel is selected for the communication method of the communication device that performs the communication by the control unit, and the dedicated channel information is set in the storage unit for the communication method other than the communication method of the communication device that performs the communication, Since one common radio channel is selected from the common radio channels excluding the common radio channel indicated by the dedicated channel information, only the communication device of the communication method of the common radio channel for which the dedicated channel information is set is shared. A wireless channel can be used. Therefore, contention on the common radio channel can be avoided.

  Furthermore, the use restriction information is priority channel information indicating that it is a common radio channel that can be used with priority over any one of the plurality of communication methods, for example, “priority”. And when the control unit selects a common radio channel for the communication method of the communication device that performs the communication, priority channel information is set in the storage unit for the communication method other than the communication method of the communication device that performs the communication. If the usage rate using the common radio channel to be selected is less than a predetermined reference usage rate, one common radio channel is selected from the common radio channels including the common radio channel indicated by the priority channel information, When the usage rate is equal to or higher than a predetermined reference usage rate, a common radio channel excluding the common radio channel indicated by the priority channel information Since one common radio channel is selected from among them, the usage rate of the common radio channel indicated by the priority channel information is kept below a certain usage rate, and communication of the communication method of the common radio channel in which the priority channel information is set The device can use its common radio channel. Therefore, it is possible to select a radio channel that does not compete even when communication is congested.

  Furthermore, the use restriction information includes, for example, “reservation” which is reserved channel information indicating that the wireless channel is a common radio channel reserved for use in any one of the plurality of communication methods. When the control unit selects a common radio channel for the communication method of the communication device that performs the communication, reserved channel information is set in the storage unit for the communication method other than the communication method of the communication device that performs the communication. When communication is performed using a radio channel corresponding to the common radio channel indicated by the reserved channel information, one common radio channel is selected from the common radio channels excluding the common radio channel indicated by the reserved channel information. The reserved channel information indicates that communication is not being performed on the wireless channel corresponding to the common wireless channel indicated by the information. Since one common radio channel is selected from the common radio channels including the communication radio channel, the reserved channel information is set if communication is not performed on the radio channel corresponding to the common radio channel for which the reserved channel information is set. A communication apparatus of a communication system other than the communication system of the common radio channel for which is set can also use the common radio channel. Therefore, radio channels that are not being used can be used effectively, and the operating rate of the radio channel when communication is busy can be increased.

  Furthermore, the first communication device, which is a communication device that performs communication using a communication method other than the communication method in which the reserved channel information is set in the storage device, is assigned to the common radio channel indicated by the reserved channel information. When the second communication device, which is a communication device that performs communication using the communication method in which the reserved channel information is set in the storage unit, performs communication during a period of communication using the corresponding wireless channel, the reserved channel information One common radio channel is selected from the common radio channels excluding the common radio channel indicated by, and the radio channel with which the first communication device is communicating is changed to a radio channel corresponding to the selected common radio channel. Communication devices other than the communication device of the communication method of the common radio channel for which reserved channel information is set Even if communication is performed on a radio channel corresponding to a common radio channel for which channel information is set, communication is performed when a communication device of the common radio channel communication method for which reserved channel information is set attempts communication. Hopping a common radio channel in which the Therefore, a communication device that has made a reservation can immediately use the common radio channel without competing even if a communication device of another communication method uses the common radio channel for which the reservation has been made. it can.

  Further, the use restriction information is open channel information indicating a common radio channel in which no dedicated channel information, priority channel information, and reserved channel information are set in any of the plurality of communication methods. For example, when the common wireless channel is selected for the communication method of the communication apparatus that performs the communication by the control unit, including the “open”, the open channel information indicates that the open channel information is set in the storage unit. Since one common radio channel is selected from the common radio channels including the common radio channel, the communication apparatus of any communication method can be used as the common radio channel in which the open channel information is set. Therefore, interference can be reduced by setting a shared radio channel where interference is unlikely to occur.

  Furthermore, the use restriction information includes, for example, “prohibition” which is prohibition channel information indicating that the communication channel is a common radio channel that is not associated with each communication method, and communication that performs the communication by the control unit. When the common wireless channel is selected for the communication method of the device, if the prohibited channel information is set in the storage means for the communication method of the communication device that performs the communication, the common wireless channel excluding the common wireless channel indicated by the prohibited channel information Since one common wireless channel is selected from among the communication devices, the communication device of the communication method of the common wireless channel for which prohibited channel information is set does not use the common wireless channel. Therefore, interference can be reduced by setting prohibited channel information in a common radio channel where interference is likely to occur.

  Furthermore, a plurality of communication devices capable of communicating with any one of a plurality of communication methods overlapping at least a part of a frequency band for performing wireless communication, and the plurality of communication devices using the plurality of communication methods. For example, a Bluetooth controller 14, a Bluetooth module 15, a wireless LAN controller 16, a wireless LAN tuner 17, a DSP 18, a digital slave tuner 19, and a plurality of wireless channels determined in advance for each communication method. For example, conversion table 70, which is correspondence information for associating a common radio channel managed in common with each communication method, and use restriction information that can be set for each common radio channel for each communication method and represents the use restriction of the common radio channel For example use channel table When controlling a wireless communication system including a communication control device having, for example, a use channel flash memory 12 and a use channel ROM 13, which is a storage unit for storing 71, when communicating with a communication device, According to the use restriction indicated by the use restriction information stored in the storage unit, one of the plurality of common radio channels is selected, and the selected common radio is selected from the radio channels of the communication scheme used by the communication device performing the communication. Since communication is performed by the communication unit using the radio channel associated with the channel, exclusive control can be performed based on the usage restrictions set for the common radio channel for managing different radio channels with different communication methods, and an error Without detection and without notice for exclusive control. It is possible to reduce conflicts line channel. Therefore, when the control method according to the present invention is applied, it is possible to reduce interference between a plurality of communication apparatuses that operate independently in a plurality of communication schemes in which frequency bands for performing wireless communication overlap.

1 shows a schematic configuration of a multifunction machine 1 according to an embodiment of the present invention. The cordless radio channel table 60 used by the DSP 18 shown in FIG. 1 is shown. 2 shows a wireless LAN channel table 61 used by the wireless LAN controller 16 shown in FIG. The Bluetooth radio channel table 62 used by the Bluetooth controller 14 shown in FIG. An example of the conversion table 70 used by the main body 10 shown in FIG. An example of the used channel table 71 used by the main body 10 shown in FIG. It is an example of the flowchart which shows the radio channel control processing which the main body 10 shown in FIG. 1 performs. 3 is a flowchart showing reservation channel release processing performed by a main body 10 shown in FIG. 1.

Explanation of symbols

1 MFP 10 Main Body 11 CPU
12 Use channel Flash memory 13 Use channel ROM
14 Bluetooth controller 15 Bluetooth module 16 Wireless LAN controller 17 Wireless LAN tuner 18 DSP
19 Digital handset tuner 20 Bluetooth terminal 30 Wireless LAN terminal 40 Digital cordless handset 50 Telephone line

Claims (8)

A plurality of communication devices capable of communicating in any one of a plurality of communication methods in which at least a part of a frequency band for performing wireless communication overlaps;
Including a communication control device capable of communicating with the plurality of communication devices using the plurality of communication methods,
The communication control device includes:
A communication means capable of communicating with each communication method;
Correspondence information for associating a predetermined wireless channel for each communication method with a common wireless channel managed in common by a plurality of communication methods, and each communication method can be set for each common wireless channel, and use restrictions on the common wireless channel Storage means for storing usage restriction information representing;
When communicating with a communication device, the communication method of the communication device is selected according to the use restriction indicated by the use restriction information stored in the storage means, and one of the plurality of common radio channels is selected to perform the communication. Control means for performing communication by the communication means on the wireless channel associated with the selected common wireless channel according to the correspondence information stored in the storage means among the wireless channels of the communication method used by the communication device, Wireless communication system. The use restriction information includes dedicated channel information indicating a common radio channel that can be used only for any one of the plurality of communication methods,
When the control unit selects a common radio channel for the communication method of the communication device that performs the communication, and the dedicated channel information is set in the storage unit for the communication method other than the communication method of the communication device that performs the communication, The radio communication system according to claim 1, wherein one common radio channel is selected from the common radio channels excluding the common radio channel indicated by the dedicated channel information. The use restriction information includes priority channel information representing a common radio channel that can be used in preference to any one of the plurality of communication methods,
When the control unit selects a common radio channel for the communication method of the communication device that performs the communication, when the priority channel information is set in the storage unit for the communication method other than the communication method of the communication device that performs the communication,
If the usage rate using the common radio channel to be selected is less than a predetermined reference usage rate, one common radio channel is selected from the common radio channels including the common radio channel indicated by the priority channel information,
The radio according to claim 1, wherein when the usage rate is equal to or higher than a predetermined reference usage rate, one common radio channel is selected from the common radio channels excluding the common radio channel indicated by the priority channel information. Communications system. The use restriction information includes reserved channel information indicating a common radio channel reserved for use in any one of the plurality of communication methods,
When the control unit selects a common radio channel for the communication method of the communication device that performs the communication, when reserved channel information is set in the storage unit for a communication method other than the communication method of the communication device that performs the communication,
When communication is performed on a radio channel corresponding to the common radio channel indicated by the reserved channel information, one common radio channel is selected from the common radio channels excluding the common radio channel indicated by the reserved channel information,
When communication is not performed on a radio channel corresponding to the common radio channel indicated by the reserved channel information, one common radio channel is selected from the common radio channels including the common radio channel indicated by the reserved channel information. The wireless communication system according to claim 1.   In the control unit, the first communication device, which is a communication device that performs communication using a communication method other than the communication method in which the reserved channel information is set in the storage unit, performs wireless communication corresponding to the common wireless channel indicated by the reserved channel information. When the second communication device, which is a communication device that performs communication using the communication method in which the reserved channel information is set in the storage unit, performs communication during a period in which communication is performed using a channel, the reserved channel information indicates the common One common radio channel is selected from the common radio channels excluding the radio channel, and the radio channel with which the first communication device is communicating is switched to the radio channel corresponding to the selected common radio channel by the communication means. The wireless communication system according to claim 4. The use restriction information includes open channel information indicating that the communication channel is a common radio channel that does not set dedicated channel information, priority channel information, and reserved channel information in any of the communication methods.
When the open channel information is set in the storage unit when the common radio channel is selected for the communication method of the communication apparatus that performs the communication, the control unit sets the common radio channel including the common radio channel indicated by the open channel information. 2. The wireless communication system according to claim 1, wherein one common wireless channel is selected from among them. The use restriction information includes prohibited channel information indicating that the communication channel is a common radio channel that is not associated with each communication method,
When the control unit selects a common radio channel for the communication method of the communication device that performs the communication, and the prohibited channel information is set in the storage unit for the communication method of the communication device that performs the communication, the prohibited channel information is The wireless communication system according to claim 1, wherein one common wireless channel is selected from the common wireless channels excluding the common wireless channel shown. A plurality of communication devices capable of communicating in any one of a plurality of communication methods in which at least a part of a frequency band for performing wireless communication overlaps;
A communication unit capable of communicating with the plurality of communication devices using the plurality of communication methods, and correspondence information for associating a predetermined wireless channel for each communication method with a common wireless channel managed in common by the plurality of communication methods; and A control method for a radio communication system including a communication control device having a storage unit that stores use restriction information that can be set for each common radio channel for each communication method and represents use restriction of the common radio channel,
When communicating with a communication device, the communication method of the communication device is selected according to the use restriction indicated by the use restriction information stored in the storage unit, and one of the plurality of common radio channels is selected to perform the communication. A control method for a radio communication system, characterized in that communication is performed by a communication unit using a radio channel associated with a selected common radio channel among radio channels of a communication method used by a communication apparatus.

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