JP2023024166A - Radio device and radio communication system - Google Patents

Abstract

To provide a technique for giving a notification that a connection request cannot be responded even if the connection request cannot be responded when communication is available in a plurality of frequency bands.SOLUTION: A VHF radio communication unit 210 can perform radio communication using a first frequency band, and a UHF radio communication unit 220 can perform radio communication using a second frequency band. A short-range wireless communication unit 240 can perform short-range wireless communication. A control unit 250 transmits a notification signal for giving a notification that communication is in progress from the short-range wireless communication unit 240, when the UHF radio communication unit 220 receives an incoming call from a second communication device while the VHF radio communication unit 210 is communicating with a first communication device. The notification signal includes information giving instruction to transfer a message indicating that the VHF radio communication unit 210 is in communication to the second communication device.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to communication technology, and more particularly to a wireless device and wireless communication system capable of performing communication in multiple frequency bands.

A wireless device wirelessly transmits and receives data to acquire various data. Data cannot be transmitted or received when the reception power in the wireless device drops. Therefore, when the reception strength and the like in the first communication means satisfy proxy communication conditions, proxy communication is performed by the second communication means (for example, Patent Document 1).

Japanese Unexamined Patent Application Publication No. 2013-201581

A wireless device that supports a plurality of frequency bands generally cannot respond to an incoming call in another frequency band when a call is being made in one frequency band. As a result, the sender may feel uncomfortable because there is no response, or there may be a discrepancy in the situation where the sender may have intended to contact the receiver but the receiver may not have recognized it.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and its object is to provide a technique for notifying the user of a failure to respond to a connection request when communication is possible in a plurality of frequency bands.

In order to solve the above problems, a wireless device according to one aspect of the present invention includes a first wireless communication unit capable of performing wireless communication using a first frequency band, and wireless communication using a second frequency band different from the first frequency band. a second wireless communication unit capable of executing short-range wireless communication, a short-range wireless communication unit capable of performing short-range wireless communication, and a control unit that controls the first wireless communication unit, the second wireless communication unit, and the short-range wireless communication unit Prepare. When the second wireless communication unit receives an incoming call from the second communication device while the first wireless communication unit is communicating with the first communication device, the control unit notifies that communication is in progress. A signal is sent from the short-range wireless communication unit, the notification signal including information instructing the second communication device to forward a message indicating that the first wireless communication unit is busy.

Another aspect of the invention is a wireless communication system. This radio communication system includes a first radio device and a second radio device. The first radio device includes a first radio communication unit capable of executing radio communication using a first frequency band, a second radio communication unit capable of executing radio communication using a second frequency band different from the first frequency band, A short-range wireless communication unit capable of executing long-distance wireless communication, and a control unit that controls the first wireless communication unit, the second wireless communication unit, and the short-range wireless communication unit. When the second wireless communication unit receives a connection request from the second communication device while the first wireless communication unit is communicating with the first communication device, the control unit notifies that communication is in progress. A notification signal is transmitted from the short-range wireless communication unit, and the notification signal transmitted from the short-range wireless communication unit is relayed by the second wireless device and transferred to the second communication device.

Any combination of the above constituent elements, and any conversion of expressions of the present invention into methods, devices, systems, recording media, computer programs, etc. are also effective as embodiments of the present invention.

According to the present invention, when communication is possible in a plurality of frequency bands, it can be notified even if it cannot respond to a connection request.

1 is a diagram showing the configuration of a radio communication system according to an embodiment; FIG. FIG. 2 is a diagram showing the configuration of the wireless device in FIG. 1; FIG. 3 is a diagram showing a format of a notification signal transferred in the short-range wireless communication unit of FIG. 2; FIG. 3 is a diagram showing the data structure of a table stored in the storage unit of FIG. 2; FIG. 2 is a sequence diagram showing a communication procedure by the wireless communication system of FIG. 1; FIG.

Before specifically describing the present invention, an overview will be given first. An embodiment of the present invention is a wireless communication system including a wireless device capable of performing wireless communication with each of a plurality of command stations using different frequency bands. A wireless device compatible with such multiple frequency bands has, for example, a multi-deck configuration. When a wireless device with a multi-deck configuration is installed in a vehicle or the like, antennas for each frequency band are arranged close to each other. If signals are simultaneously transmitted in a plurality of frequency bands in this state, high-power radio waves transmitted from each antenna will interfere with each other and be disturbed, possibly degrading communication quality. Therefore, when a call is being made in one frequency band, the wireless device cannot respond to an incoming call in another frequency band. As a result, the sender may be annoyed by the lack of response, or a state discrepancy may occur in which the sender intends to contact but the receiver does not recognize it. Therefore, when communication is possible in a plurality of frequency bands, it is required to inform the transmitting side of this fact even if it cannot respond to an incoming call.

When a call is made in one frequency band and there is an incoming call in another frequency band, the radio device according to the present embodiment transmits the call to the other radio device through short-range wireless communication. to be notified. Other wireless devices that receive this notification forward to the sender that the wireless device is busy.

FIG. 1 shows the configuration of a wireless communication system 1000. As shown in FIG. The radio communication system 1000 includes first command stations 100 a to third command stations 100 c , collectively referred to as command stations 100 , and first radio devices 200 a to third radio devices 200 c, collectively referred to as radio devices 200 . The number of command stations 100 included in the radio communication system 1000 is not limited to "3", and may be "2" or more. Also, the number of wireless devices 200 included in the wireless communication system 1000 is not limited to "3", and may be "2" or more.

Wireless communication system 1000 is used, for example, in police. The police use different frequencies for each management area, and police vehicles operating across management areas are required to use multiple frequency bands. Also, the wireless communication system 1000 is used in different industries such as police, fire department, and local government.

The first command station 100a to the third command station 100c are arranged in different management areas. As described above, the first command station 100a to the third command station 100c are capable of wireless communication using different frequency bands. For example, the first command station 100a uses the VHF (Very High Frequency) band, the second command station 100b uses the UHF (Ultra High Frequency) band, and the third command station 100c uses the 800 MHz band.

The first radio device 200a is mounted on a vehicle such as a police vehicle. The first radio device 200a performs radio communication with the first command station 100a in the VHF band, radio communication with the second command station 100b in the UHF band, and radio communication with the third command station 100c in the 800 MHz band. carry out communication. When performing wireless communication with one command station 100 , the first radio apparatus 200 a does not perform wireless communication with the remaining command stations 100 . The second radio device 200b and the third radio device 200c are similar to the first radio device 200a.

A commander (hereinafter referred to as a "first commander") operates the first command station 100a to communicate with the wireless device 200 in the VHF band. A commander (hereinafter referred to as a "second commander") operates the second command station 100b to make a call with the wireless device 200 in the UHF band. A commander (hereinafter referred to as a "third commander") operates the third command station 100c to make a call with the wireless device 200 in the 800 MHz band. Calls between the command station 100 and the wireless device 200 are made by PTT (Push To Talk).

FIG. 2 shows the configuration of wireless device 200 . Radio device 200 includes VHF radio communication section 210 , UHF radio communication section 220 , 800 MHz band radio communication section 230 , short-range radio communication section 240 , control section 250 , storage section 260 , microphone 270 and speaker 280 . The control unit 250 includes a communication detection unit 252 and a transfer processing unit 254 .

The VHF radio communication unit 210 can perform radio communication in the VHF band, and can communicate with the first command station 100a in FIG. 1, for example. The UHF wireless communication unit 220 can perform wireless communication in the UHF band, and can communicate with the second command station 100b in FIG. 1, for example. The 800 MHz band wireless communication unit 230 can perform wireless communication in the 800 MHz band, and can communicate with the third command station 100c in FIG. 1, for example. That is, the VHF radio communication unit 210, the UHF radio communication unit 220, and the 800 MHz band radio communication unit 230 can perform radio communication using different frequency bands. The VHF radio communication unit 210 has a VHF radio communication antenna 212 , the UHF radio communication unit 220 has a UHF radio communication antenna 222 , and the 800 MHz band radio communication unit 230 has an 800 MHz band radio communication antenna 232 . When wireless device 200 is installed in a vehicle, VHF wireless communication antenna 212, UHF wireless communication antenna 222, and 800 MHz band wireless communication antenna 232 are close to each other. In this state, if high-power transmissions occur simultaneously in multiple frequency bands, interference will occur. Therefore, the wireless device 200 has a specification that does not allow simultaneous transmission in a plurality of frequency bands. The VHF wireless communication unit 210, the UHF wireless communication unit 220, and the 800 MHz band wireless communication unit 230 may have a multi-deck configuration by being accommodated in separate housings.

The short-range wireless communication unit 240 includes a short-range wireless communication antenna 242 and is capable of performing short-range wireless communication. Short-range wireless communication is, for example, Bluetooth (registered trademark). Control unit 250 controls VHF wireless communication unit 210 , UHF wireless communication unit 220 , 800 MHz band wireless communication unit 230 , and short-range wireless communication unit 240 . Communication detection unit 252 detects whether wireless communication is being performed in any one of VHF wireless communication unit 210, UHF wireless communication unit 220, and 800 MHz band wireless communication unit 230. FIG. The communication detection unit 252 detects wireless communication based on radio wave intensity or presence/absence of voice data at the time of reception, and detects wireless communication based on the pressing of the PTT button or the presence/absence of voice from the microphone 270 at the time of transmission. The microphone 270 receives voice emitted by the user, converts the voice into an electrical signal, and outputs the electrical signal to the control unit 250 . Speaker 280 receives an electric signal from control unit 250, converts the electric signal into sound, and outputs the sound. A microphone 270 and a speaker 280 are used during a call.

In the following, it is assumed that the radio device 200 is the first radio device 200a in FIG. Assume that a connection request is received from the station 100b in the UHF band. More specifically, the communication in VHF radio communication section 210 is a call, and the connection request received in UHF radio communication section 220 is an incoming call. The radio communication unit that executes a call is not limited to the VHF radio communication unit 210, and the radio communication unit that receives an incoming call is not limited to the UHF radio communication unit 220. Among VHF radio communication unit 210, UHF radio communication unit 220, and 800 MHz band radio communication unit 230, if the radio communication unit that performs a call is called the first radio communication unit, the radio communication unit that receives an incoming call is the second radio communication unit. called a department.

The communication detection unit 252 detects an incoming call in the UHF radio communication unit 220 after detecting that the VHF radio communication unit 210 is talking. In this state, transfer processing unit 254 broadcasts a notification signal from short-range wireless communication unit 240 to notify that the call is in progress. FIG. 3 shows the format of the notification signal transferred in the short-range wireless communication unit 240. As shown in FIG. The source information indicates the wireless device 200 that originates the notification signal, such as the first wireless device 200a. The destination information indicates the command station 100 that is the final destination of the notification signal, such as the second command station 100b. The transfer message indicates a message to be transmitted from the first radio apparatus 200a to the second command station 100b, and is, for example, busy. Forwarded messages are stored at 260 . Return to FIG.

In the following, it is assumed that the wireless device 200 is the second wireless device 200b in FIG. The second radio device 200b exists within a range where it can communicate with the first radio device 200a by short-range wireless communication. On the other hand, the third radio device 200c in FIG. 1 exists within a range where it cannot communicate with the first radio device 200a by near field communication. The short-range wireless communication unit 240 of the second wireless device 200b receives the notification signal broadcasted from the first wireless device 200a. The transfer processing unit 254 confirms destination information in the notification signal received by the short-range wireless communication unit 240 . Here, it is confirmed that the destination information indicates the second command station 100b.

FIG. 4 shows the data structure of a table stored in the storage unit 260. As shown in FIG. The table shows the wireless communication unit to be used for each communication target station. The VHF radio communication unit 210 is used when the communication target station is the first command station 100a, the UHF radio communication unit 220 is used when the communication target station is the second command station 100b, and the communication target station is the third command station. The 800 MHz band wireless communication unit 230 is used for the command station 100c. Return to FIG. Since the destination information indicates the second command station 100b, the transfer processing unit 254 refers to the table and determines the use of the UHF radio communication unit 220. FIG. The transfer processing unit 254 outputs a notification signal to the UHF wireless communication unit 220, and the UHF wireless communication unit 220 transmits the notification signal to the second command station 100b by wireless communication using the UHF band. That is, the notification signal broadcasted from the first radio apparatus 200a is relayed by the second radio apparatus 200b and transferred to the second command station 100b.

The second command station 100b in FIG. 1 receives the notification signal from the second radio apparatus 200b. The second command station 100b displays the contents of the notification signal, particularly the source information and the transfer message. As a result, the second commander recognizes that first radio device 200a is busy.

Here, while the first radio apparatus 200a is communicating with the first command station 100a via the VHF radio communication section 210, the VHF radio communication section 210 of the second radio apparatus 200b is also capable of reception. However, the VHF radio communication unit 210 of the second radio device 200b only receives the signal and does not transmit the signal. Therefore, it is possible to use the UHF radio communication unit 220 of the second radio device 200b for transmission. Also, when the first radio apparatus 200a executes one-to-one communication with the first command station 100a, the second radio apparatus 200b does not use the VHF radio communication section 210, so the UHF radio communication section 220 is used for transmission. can be used for The second radio device 200b may not have a multi-deck configuration and may include only the UHF radio communication section 220 and the short-range radio communication section 240. FIG.

This configuration can be implemented in terms of hardware by the CPU, memory, and other LSIs of any computer, and in terms of software, it is implemented by programs loaded in the memory. It depicts the function blocks to be used. Therefore, those skilled in the art will understand that these functional blocks can be realized in various forms by hardware only, software only, or a combination thereof.

The operation of the radio communication system 1000 configured as above will be described. FIG. 5 is a sequence diagram showing communication procedures by the wireless communication system 1000. As shown in FIG. The first command station 100a and the first radio device 200a are in communication in the VHF band (S10). The first radio apparatus 200a receives an incoming call from the second command station 100b in the UHF band (S12). The first wireless device 200a determines transfer (S14), and broadcasts a notification signal by short-range wireless communication (S16). Upon receiving the notification signal, the second radio apparatus 200b transmits the notification signal to the second command station 100b in the UHF band (S18).

According to this embodiment, when the first wireless device 200a receives a connection request in another frequency band while the first wireless device 200a is communicating in one frequency band, the call signal is transferred by short-range wireless communication. can be notified to the transmitter of the other frequency band. In addition, since the transmission side of the other frequency band is notified that communication is in progress, when communication is possible in a plurality of frequency bands, it can be notified even if it cannot respond to the connection request. In addition, when communication is possible in multiple frequency bands, even if a connection request cannot be responded to, it will be notified. can be prevented. In addition, it is possible to prevent the occurrence of discrepancies in information transmission such that the receiving side does not recognize even if the transmitting side intends to contact the other party in a broadcast manner. In addition, since simultaneous transmission of high power using a plurality of frequency bands is avoided, it is possible to reduce the influence on communication during a call.

The present invention has been described above based on the examples. It should be understood by those skilled in the art that this embodiment is merely an example, and that various modifications can be made to combinations of each component and each treatment process, and such modifications are within the scope of the present invention. .

100 command station, 200 wireless device, 210 VHF wireless communication unit, 220 UHF wireless communication unit, 230 800 MHz band wireless communication unit, 240 near field wireless communication unit, 250 control unit, 252 communication detection unit, 254 transfer processing unit, 260 storage Part, 270 Microphone, 280 Speaker, 1000 Wireless Communication System.

Claims (4)

a first wireless communication unit capable of performing wireless communication in a first frequency band;
a second wireless communication unit capable of performing wireless communication in a second frequency band different from the first frequency band;
a short-range wireless communication unit capable of executing short-range wireless communication;
A control unit that controls the first wireless communication unit, the second wireless communication unit, and the short-range wireless communication unit,
When the second wireless communication unit receives an incoming call from the second communication device while the first wireless communication unit is communicating with the first communication device, the control unit notifies that communication is in progress. transmitting a notification signal for from the short-range wireless communication unit;
The wireless device, wherein the notification signal includes information instructing transfer of a message indicating that the first wireless communication unit is busy to the second communication device. The wireless device according to claim 1, wherein the notification signal includes transmission source information of the notification signal, transfer destination information of the notification signal, and message information to be transferred. The notification signal transmitted from the short-range wireless communication unit is transmitted by short-range wireless communication to another wireless device capable of performing short-range wireless communication and wireless communication using the second frequency band. 3. The wireless device according to claim 1, wherein the received signal is transmitted from the other wireless device to the second communication device by wireless communication using the second frequency band. a first radio device;
and a second radio device,
The first radio device,
a first wireless communication unit capable of performing wireless communication in a first frequency band;
a second wireless communication unit capable of performing wireless communication in a second frequency band different from the first frequency band;
a short-range wireless communication unit capable of executing short-range wireless communication;
A control unit that controls the first wireless communication unit, the second wireless communication unit, and the short-range wireless communication unit,
When the second wireless communication unit receives a connection request from the second communication device while the first wireless communication unit is communicating with the first communication device, the control unit determines that communication is in progress. Transmitting a notification signal for notification from the short-range wireless communication unit,
A wireless communication system in which the notification signal transmitted from the short-range wireless communication unit is transferred to the second communication device by relaying by the second wireless device.

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