JP5761965B2 - Wireless device - Google Patents

Description

  The present invention relates to a wireless device for transmitting a wireless signal.

  In general homes and the like, crime prevention systems that monitor for abnormalities such as the presence of intruders and fires, and notify the abnormality when an abnormality is detected have become widespread. In particular, in recent years, a wireless crime prevention system that transmits a signal wirelessly from a detection sensor, receives the transmitted signal by a receiving device, and performs abnormality notification or the like has been put into practical use.

  FIG. 9 is an explanatory diagram for explaining a configuration of a conventional wireless crime prevention system. As shown in FIG. 9, a wireless crime prevention system 100 includes a wireless opening / closing sensor 101 that detects the open / closed state of a door or window, a wireless fire sensor 102 that detects a fire, and a wireless security sensor that detects a human body. It is configured to include a human sensor 103, a wireless abnormality alarm lamp 104 for informing the outdoors of an abnormality, a repeater 105 that wirelessly relays signals transmitted from these sensors 101 to 103, and a receiving device 106. Yes. The receiving device 106 receives the signals transmitted from the sensors 101 to 103 via the repeater 105 or directly receives the signals, thereby monitoring the presence / absence of the abnormality and detecting the abnormality when detecting the abnormality. A warning signal is transmitted to the lamp 104 wirelessly to notify the abnormality, and if necessary, the abnormality occurrence is transferred to the security company by wire or wirelessly (for example, Patent Document 1 discloses an abnormality detection means. A security system for houses is disclosed).

  In such a wireless crime prevention system 100, since wireless transmission is performed at a short distance of about several meters to several tens of meters, the frequency band for wireless transmission is a 426 MHz band that is a specific low-power security wireless band. It was used. Here, in ARIB STD-30, which is a standard for this specific low-power security radio, carrier sense is not obliged when using radio waves having a frequency of 426.250 MHz or more and 426.8375 MHz or less. Carrier sense, when performing wireless transmission, senses the received power level of other radio waves in the same frequency band as the carrier frequency band in the wireless transmission, and when this received power level is a predetermined threshold or more, This means that wireless transmission is not performed. Thus, since it is not necessary to perform carrier sense in the 426 MHz band and the wireless transmission function can be simplified, in the conventional wireless security system, each of the sensors 101 to 103 performs wireless transmission in the 426 MHz band.

Japanese Patent Laid-Open No. 2003-115085

  However, in the conventional wireless crime prevention system 100, only one frequency band such as the 426 MHz band is used as the frequency band for wireless transmission, and therefore a failure occurs in the radio signal transmission / reception function in the 426 MHz band. In this case, it was not possible to send and receive radio signals. For example, when a failure occurs in the transmission / reception function of the receiving device 106, the wireless signal transmitted from each of the sensors 101 to 103 and the repeater 105 cannot be received by the receiving device 106, or from the receiving device 106. Wireless signals could not be transmitted to the sensors 101 to 103 and the repeater 105. For this reason, there is a possibility that the security function may be hindered.

  The present invention has been made in view of the above, and enables transmission of a signal even when a failure occurs in a transmission function of transmitting a radio signal in a specific frequency band. An object of the present invention is to provide a wireless device capable of improving the reliability of communication.

In order to solve the above-described problems and achieve the object, the wireless device according to claim 1 is a wireless device that transmits a wireless signal, and performs wireless signal transmission processing in a predetermined first frequency band. A first signal processing unit, a second signal processing unit that performs transmission processing of a radio signal in a predetermined second frequency band whose frequency band and communication speed are different from the first frequency band, and a first signal processing unit A failure detection unit that detects a failure, and when a failure of the first signal processing unit is not detected by the failure detection unit, a radio signal is transmitted via the first signal processing unit to the first frequency. When a failure of the first signal processing unit is detected by the failure detection unit, a radio signal is transmitted in the second frequency band via the second signal processing unit, and the failure is detected. When a failure of the first signal processing unit is detected by the detection unit, the wireless device A frequency switching request signal for requesting transmission to the second radio band instead of the first frequency band is sent to another radio apparatus that transmits a radio signal via the second signal processing unit. Transmit in the second frequency band .

Wireless device according to claim 2, in the wireless apparatus of claim 1, when a failure of the first signal processing unit in the failure detecting section is detected, the failure of the first signal processing unit is detected A failure notification unit for outputting a notification of the completion.

The wireless device according to claim 3 is the wireless device according to claim 1 or 2 , wherein the wireless device receives a wireless signal transmitted from a terminal device or a wireless signal transmitted from the terminal device. It is a receiver which transmits / receives a radio signal between the repeater which relays.

According to the wireless device of the first aspect, when a failure of the first signal processing unit is detected by the failure detection unit, the wireless signal is transmitted in the second frequency band through the second signal processing unit. Therefore, even if some kind of trouble occurs when transmitting a signal in the first frequency band, the signal is transmitted in the second frequency band, so that the reliability of communication can be improved.
In addition, since the frequency switching request signal is transmitted to the other radio apparatus, the signal after the time point when the failure of the first signal processing unit is detected by the failure detecting unit is replaced with the second frequency band. Since reception is possible in the frequency band, even if a failure occurs in the reception function of the first signal processing unit, it is possible to receive signals from other wireless devices, and to improve the reliability of communication.

Further, according to the wireless device according to claim 2, when the failure of the first signal processing unit is detected, the fact that the failure has been detected is output. Can be promoted, and the reliability of communication can be improved.

According to the wireless device of the third aspect, when a failure of the first signal processing unit is detected by the failure detection unit of the reception device, the wireless signal is transmitted via the second signal processing unit to the second signal. Since it transmits in a frequency band, the certainty of communication using a receiving device can be improved.

It is explanatory drawing for demonstrating the structure of the wireless crime prevention system which concerns on embodiment of this invention. It is a block diagram which shows the electric constitution of a portable setting apparatus. It is a block diagram which shows the electric constitution of a repeater. It is a block diagram which shows the electric constitution of a receiver. It is a disassembled perspective view for demonstrating the attachment / detachment structure of the radio | wireless transmission / reception part with respect to a receiver. It is a flowchart of the transmission / reception process of a repeater. It is a flowchart of the transmission / reception process of the repeater following FIG. It is a flowchart of the transmission / reception process of a receiver. It is explanatory drawing for demonstrating the structure of the conventional radio | wireless crime prevention system.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. However, the present invention is not limited by this embodiment.

(Overview)
First, the outline of the wireless crime prevention system will be described. FIG. 1 is an explanatory diagram for explaining a configuration of a wireless crime prevention system according to the present embodiment. As shown in FIG. 1, a wireless crime prevention system 1 includes an open / close sensor 10, a fire sensor 11, a human sensor 12, an abnormality notification lamp (outdoor indicator lamp) 13, a repeater 30, and a receiver (a crime prevention receiver). , Center device) 40. Among these, each apparatus except the abnormality notification lamp 13 is disposed indoors in the house, and the abnormality notification lamp 13 is installed outside the house (for example, near the entrance). In the following description, the opening / closing sensor 10, the fire sensor 11, and the human sensor 12 are collectively referred to as “security sensor 2” as necessary, and the security sensor 2 and the abnormality notification lamp 13 are referred to as “ Collectively referred to as “security terminal 3 (or terminal device)”. Here, one each of the open / close sensor 10, the fire sensor 11, the human sensor 12, the abnormality notification lamp 13, and the repeater 30 are provided, but any plurality may be provided.

  Moreover, the security system 1 of this Embodiment is comprised with the portable setting apparatus 20, unlike the conventional security system shown in FIG. The portable setting device 20 is setting means for remotely setting the security alert state of the receiving device 40 wirelessly. For example, the portable setting device 20 is carried by a user or used in an arbitrary location within a range where radio waves reach the indoor repeater 30 or the receiving device 40. In particular, when the receiving device 40 is installed in the living room and the living room is away from the entrance, it takes time until the user releases the security mode in the living receiving device 40 after the user returns home. Since there is a possibility that the security mode cannot be canceled in time, the convenience of the user can be improved by arranging the portable setting device 20 in the vicinity of the entrance.

  In this crime prevention system 1, a 426 MHz band (first frequency band) similar to the conventional one is basically used as a frequency band for transmitting and receiving signals, and only in a specific case, a 950 MHz band (second frequency band). Is used. Specifically, the security terminal 3, the portable setting device 20, the repeater 30, and the receiving device 40 use the 426 MHz band for transmission and reception of these mutual radio signals. However, the repeater 30 and the receiving device 40 are configured to be able to perform transmission / reception in the 950 MHz band in which the communication speed is set faster than the 426 MHz band in addition to the 426 MHz band. Transmission / reception is performed by switching the 426 MHz band to the 950 MHz band. The specific case is a case where the transmission / reception means (here, the first signal processing unit 47) of the 426 MHz band in the receiving device 40 has failed. Thus, in addition to the conventional 426 MHz band, the 950 MHz band can be used, thereby improving the communication speed and improving the reliability of communication. In particular, the security terminal 3 communicates only in the conventional 426 MHz band, so there is no need to replace existing ones or change the design. On the other hand, the repeater 30 and the receiving device 40 need to transmit and receive signals in two frequency bands. However, by providing only one control unit 34 and 44 to be described later for signal processing, Two frequency bands can be used together with an inexpensive structure. A specific structure for this will be described later. Since carrier sense is obligatory in the 950 MHz band, carrier sense is performed when a radio signal is transmitted using the 950 MHz band.

(Configuration-security terminal)
Next, the configuration of the wireless crime prevention system 1 will be described. First, the configuration of the security terminal 3 will be described. However, since the open / close sensor 10, the fire sensor 11, the human sensor 12, and the abnormality notification lamp 13 can be configured in the same manner as in the past, only the outline thereof will be described here. The open / close sensor 10 is a wireless open / close detection means for detecting the open / closed state of the door or window by magnetism or the like. When the open / close sensor 10 detects that the door or window is open, a signal to that effect is wirelessly transmitted. Send in. The fire sensor 11 is a fire detection means for detecting the occurrence of a fire by detecting smoke or heat. When a fire occurrence is detected, a signal to that effect is transmitted wirelessly. The human sensor 12 is a human body detection unit that detects a human body by detecting infrared rays. When a human body is detected, the human sensor 12 wirelessly transmits a signal to that effect. The abnormality notification lamp 13 is an abnormality occurrence notifying means for notifying the occurrence of an abnormality such as a fire outdoors by turning on or blinking when a transfer signal is received from the receiving device 40. However, the detection principle in these security terminals 3 is arbitrary, and other known principles can be used.

(Configuration-portable setting device)
The portable setting device 20 is a wireless device and a terminal device for setting a security alert state in the receiving device 40 by transmitting a wireless signal to the receiving device 40. FIG. 2 is a block diagram showing an electrical configuration of the portable setting device 20. As shown in FIG. 2, the portable setting device 20 includes various button groups 22 and an indicator lamp group 23 on the front surface of the housing, and a wireless transmission / reception unit 24, a speaker 25, and a storage unit inside the housing. 26, a power supply unit 27, and a control unit 28 are accommodated.

  The button group 22 includes an emergency button 22a, a start button 22b, a security button 22c, and a release button 22d. The indicator lamp group 23 includes an emergency lamp 23a, an alarm lamp 23b, an OK lamp 23c, an NG lamp 23d, a guard lamp 23e, and a release lamp 23f.

  The wireless transmission / reception unit 24 transmits and receives wireless signals in the 426 MHz band, and includes a dedicated antenna 24a in the 426 MHz band. The speaker 25 outputs an alarm sound. The storage unit 26 is constituted by, for example, a flash memory (the same applies to storage units 32 and 42 described later), and stores programs and parameters necessary for controlling the portable setting device 20. The power supply unit 27 includes a battery (not shown), and supplies power supplied from the battery to each unit of the portable setting device 20. The control unit 28 includes, for example, a CPU (Central Processing Unit) (not shown) and a program executed on the CPU. In particular, the control unit 28 includes a signal processing unit 28a.

  In the portable setting device 20 configured as described above, when the emergency button 22a is pressed, an emergency signal is transmitted to the receiving device 40 via the wireless transmission / reception unit 24, and the emergency light 23a is turned on or blinking (hereinafter referred to as “emergency light”) The lighting or flashing is simply described as lighting). When the emergency signal is received by the receiving device 40, the emergency signal is transferred from the receiving device 40 to the security company, and the security guard rushes to the house.

  When the security button 22c is pressed, the security lamp 23e is turned on. When the start button 22b is pressed in this state, a security request signal is transmitted via the wireless transmission / reception unit 24. When the guard request signal is received by the receiving device 40, the crime prevention mode of the receiving device 40 is set to the outing guard mode. Here, the outing security mode is a mode in which the security company performs monitoring when the user goes out. When an abnormality occurs, an abnormal signal is transferred from the receiving device 40 to the security company, and the security guard rushes to the house. . Further, when the crime prevention mode of the receiving device 40 is set to the outing security mode in this way, a security confirmation signal is transmitted from the receiving device 40, and this security confirmation signal is transmitted via the wireless transmission / reception unit 24 of the portable setting device 20. If received, the OK lamp 23c is turned on. On the other hand, when the security confirmation signal is not received by the portable setting device 20 within a predetermined time after the start button 22b is pressed, the NG lamp 23d is turned on.

  When the release button 22d is pressed, the release lamp 23f is turned on. When the start button 22b is pressed in this state, a release request signal is transmitted via the wireless transmission / reception unit 24. When the release request signal is received by the receiving device 40, the crime prevention mode of the receiving device 40 is released. When the crime prevention mode is released in this way, a release confirmation signal is transmitted from the receiving device 40, and when this release confirmation signal is received via the wireless transmission / reception unit 24 of the portable setting device 20, the OK light 23c. Lights up. On the other hand, if the release confirmation signal is not received by the portable setting device 20 within a predetermined time after the start button 22b is pressed, the NG lamp 23d is turned on. Hereinafter, the security request signal and the release request signal are collectively referred to as a request signal, and the security confirmation signal and the release confirmation signal are collectively referred to as a confirmation signal.

(Configuration-repeater)
1 is a relay means for receiving a signal wirelessly transmitted from the security sensor 2 and transmitting the received signal to the portable setting device 20 or the receiving device 40. It is a wireless repeater for the crime prevention system that receives. The repeater 30 is also a relay unit that receives a signal wirelessly transmitted from the receiving device 40 and transmits the signal to the portable setting device 20 or the abnormality notification lamp 13. The repeater 30 is disposed between the security sensor 2 and the receiving device 40, or is disposed between the receiving device 40 and the abnormality notification lamp 13.

  FIG. 3 is a block diagram showing an electrical configuration of the repeater 30. As shown in FIG. 3, the repeater 30 includes a wireless transmission / reception unit 31, a storage unit 32, a power supply unit 33, and a control unit 34. The wireless transmission / reception unit 31 transmits / receives signals in the 426 MHz band and the 950 MHz band. Details of the wireless transmission / reception unit 31 will be described later. The storage unit 32 stores programs and parameters necessary for controlling the repeater 30, and particularly stores a frequency switching flag. The frequency switching flag is a flag for identifying whether the radio signal is transmitted / received in the 426 MHz band or the 950 MHz band. Here, when the frequency switching flag = 0, the 426 MHz band, the frequency switching flag = 1. In this case, transmission / reception is performed in the 950 MHz band (the same applies to the frequency switching flag of the receiving device 40). The power supply unit 33 includes a battery (not shown), and supplies power supplied from the battery to each unit of the repeater 30. The control unit 34 is a control unit that controls each unit of the repeater 30.

  Here, the detail of the structure of the radio | wireless transmission / reception part 31 is demonstrated. The wireless transmission / reception unit 31 includes an antenna 35, an antenna side connection unit 36, a first signal processing unit 37, a second signal processing unit 38, and a control unit side connection unit 39. Only one antenna 35 is provided, and this antenna 35 is used in combination for transmission and reception of signals in two frequency bands of the 426 MHz band and the 950 MHz band. That is, the total length L of the antenna 35 is determined to be a quarter wavelength of 426 MHz and a fifth wavelength of 950 MHz so that the 426 MHz band and the 950 MHz band can be used together. The antenna side connection part 36 is a connection terminal connected to the antenna 35.

  The first signal processing unit 37 processes a 426 MHz band signal, and includes an LPF (low-pass filter) 37a and a first basic processing unit 37b. The LPF 37a is a first frequency band passing means that allows only signals below the vicinity of the 426 MHz band to pass. The LPF 37a may be a BPF (band pass filter) that allows only the vicinity of the 426 MHz band to pass. The first basic processing unit 37b converts the signal in the first frequency band received by the antenna 35 and input through the antenna side connection unit 36 into a signal of a predetermined first method, and controls the control unit side connection unit 39. The first system signal input from the control unit 34 via the control unit side connection unit 39 is output to the antenna 35 via the antenna side connection unit 36 in the first frequency band. .

  The second signal processing unit 38 processes a 950 MHz band signal, and includes an HPF (High Pass Filter) 38a, a second basic processing unit 38b, and a compatible processing unit 38c. The HPF 38a is a first frequency band passing means that allows only signals in the vicinity of the 950 MHz band or higher to pass. The HPF 38a may be a BPF (band pass filter) that passes only the vicinity of the 950 MHz band. The second basic processing unit 38b converts the second frequency band signal received by the antenna 35 and input via the antenna side connection unit 36 into a predetermined second system signal and outputs the second system signal. Is output to the antenna 35 via the antenna side connection section 36 in the second frequency band. The compatible processing unit 38c converts the signal output from the second basic processing unit 38b into the second system signal and converts the signal into the first system signal, and sends it to the control unit 34 via the control unit side connection unit 39. In addition to outputting, the first system signal input from the control unit 34 via the control unit side connection unit 39 is converted into a second system signal and output to the second basic processing unit 38b.

  In the repeater 30, basically, the first signal processing unit 37 transmits a radio signal in the 426 MHz band without performing carrier sense. However, when a frequency switching request signal, which will be described later, is received from the receiving device 40, the second signal processing unit 38 transmits and receives a radio signal in the 950 MHz band to the receiving device 40. When transmitting a radio signal in the 950 MHz band, the second signal processing unit 38 performs carrier sense by a known method, and transmits a radio signal only when a carrier in the same frequency band is not detected.

  Of the components of the wireless transmission / reception unit 31 configured as described above, the components other than the antenna 35 are mounted on both surfaces of the same base and modularized. More specifically, for example, the first basic processing unit 37b and the second basic processing unit 38b are each configured by a wireless IC, and the compatible processing unit 38c is configured by a microcomputer, and the wireless IC and the microcomputer are the same. It is mounted on both sides of the board. In designing this mounting layout, a configuration for preventing mutual interference between a signal of 426 MHz band and a signal of 950 MHz band (for example, installation of an impedance for reducing power supply noise, disposition of 426 MHz system and 950 MHz system, noise It is preferable to employ a shield installation or the like.

  Here, the signal system will be described. Here, the signal system means a signal that causes a difference other than the frequency band between the 426 MHz band signal and the 950 MHz band signal, and includes, for example, a transmission / reception protocol, a signal format, and a command system. Hereinafter, a case where the signal system is a command system will be described. That is, the first basic processing unit 37b converts a signal in the 426 MHz band that is analog input via the antenna into a command corresponding to the content of the signal and outputs it as a serial signal, and the second basic processing unit 38b A 950 MHz band signal analog-input via the antenna is converted into a command corresponding to the content of the signal and output as a serial signal. Here, the command system of the 426 MHz band signal (first command system) and the command system of the 950 MHz band signal (second command system) are different from each other. The commands of the second command system are converted to each other as necessary.

  For example, when both the reception frequency band and the transmission frequency band are 426 MHz bands, the first basic processing unit 37b of the first signal processing unit 37 converts this signal into a command of the first command system and sends it to the control unit 34. Based on this command, the control unit 34 performs signal type determination, signal transmission necessity determination, and the like. When it is determined that a predetermined signal needs to be transmitted, the control unit 34 transmits a transmission instruction based on a command of the first command system to the first basic processing unit 37b, and receives the first basic unit that has received this instruction. The processing unit 37b transmits the signal in the 426 MHz band without performing carrier sense.

  Alternatively, when both the reception frequency band and the transmission frequency band are 950 MHz bands, the second basic processing unit 38b of the second signal processing unit 38 converts this signal into a command of the second command system, and the compatibility processing unit 38c. The compatible processing unit 38c converts the command of the second command system into a command of the first command system and transmits the command to the control unit 34. The control unit 34 determines the signal type and the signal based on the command. A transmission necessity judgment is performed. When it is determined that a predetermined signal needs to be transmitted, the control unit 34 transmits a transmission instruction by a command of the first command system to the compatible processing unit 38c, and the compatible processing unit 38c transmits the first command system. Are converted into commands of the second command system and output to the second basic processing unit 38b. The second basic processing unit 38b performs carrier sensing and transmits the signal in the 950 MHz band.

  Alternatively, when the reception frequency band is the 426 MHz band and the transmission frequency band is the 950 MHz band, the first basic processing unit 37b of the first signal processing unit 37 converts this signal into a command of the first command system and performs control. Based on this command, the control unit 34 performs signal type determination, signal transmission necessity determination, and the like. When it is determined that a predetermined signal needs to be transmitted, the control unit 34 transmits a transmission instruction by a command of the first command system to the compatible processing unit 38c, and the compatible processing unit 38c transmits the first command system. Are converted into commands of the second command system and output to the second basic processing unit 38b. The second basic processing unit 38b performs carrier sensing and transmits the signal in the 950 MHz band.

  Conversely, when the reception frequency band is the 950 MHz band and the transmission frequency band is the 426 MHz band, the second basic processing unit 38b of the second signal processing unit 38 converts this signal into a command of the second command system. The compatibility processing unit 38c outputs the command of the second command system to the command of the first command system and transmits the command to the control unit 34. The control unit 34 converts the signal based on the command to the signal processing unit 38c. Type determination and signal transmission necessity determination are performed. When it is determined that a predetermined signal needs to be transmitted, the control unit 34 transmits a transmission instruction based on a command of the first command system to the first basic processing unit 37b, and receives the first basic unit that has received this instruction. The processing unit 37b transmits the signal in the 426 MHz band without performing carrier sense.

  In this way, the specific content of the command converted by the compatibility processing unit 38c is arbitrary. For example, the frequency ch (channel) setting, the signal transmission instruction, the signal reception instruction, the carrier sense automatic execution instruction, An instruction to transmit the value of the radio wave intensity acquired by carrier sense can be given. In order to perform such conversion, command conversion data for converting a command of the second command system into a command of the first command system is stored in advance in the compatibility processing unit 38c. By adopting such a configuration, the control unit 34 may communicate with the wireless transmission / reception unit 31 using only commands of the first command system (control of signals in the 426 MHz band as in the past). Since it is not necessary to use two commands of the first command system and the second command system, the configuration of the control unit 34 can be simplified.

(Configuration-Receiver)
Next, the receiving device 40 in FIG. 1 will be described. The receiving device 40 is a control device that monitors the presence or absence of an abnormality by receiving a signal transmitted from the security sensor 2 via the repeater 30 or by directly receiving the signal. The signal from the security sensor 2 Is a wireless device for a crime prevention system that receives When the receiving device 40 detects an abnormality, the abnormality notification lamp 13 is wirelessly transmitted to the abnormality notification lamp 13 to notify the abnormality, and if necessary, an abnormality occurrence is wired or wirelessly to the security company. It is also a wireless repeater for transferring information. The receiving device 40 is installed, for example, in a place (typically, an entrance or a living room) that is easy for a user to visually recognize indoors.

  FIG. 4 is a block diagram illustrating an electrical configuration of the receiving device 40. As shown in FIG. 4, the reception device 40 is configured to accommodate a wireless transmission / reception unit 41, a storage unit 42, a power supply unit 43, a control unit 44, and a failure notification unit 50. The storage unit 42 stores programs and parameters necessary for control of the receiving device 40, and particularly stores a frequency switching flag. The power supply unit 43 supplies power supplied from a commercial power supply to each unit of the receiving device 40. The control unit 44 controls each unit of the receiving device 40. The control unit 44 includes a failure detection unit 44a that detects a failure of the first signal processing unit 47 described later. When the failure detection unit 44a detects a failure of the first signal processing unit 47, the failure notification unit 50 outputs that the failure of the first signal processing unit 47 has been detected. And an indicator lamp.

  The wireless transmission / reception unit 41 is a wireless transmission / reception unit that transmits and receives signals in the 426 MHz band and the 950 MHz band. The antenna 45, the antenna side connection unit 46, the first signal processing unit 47, the second signal processing unit 48, and the control unit side A connection unit 49 is provided. The first signal processing unit 47 includes an LPF 47a and a first basic processing unit 47b, and the second signal processing unit 48 includes an HPF 48a, a second basic processing unit 48b, and a compatibility processing unit 48c. Since each part of these radio | wireless transmission / reception parts 41 can be comprised similarly to each part of the same name in the radio | wireless transmission / reception part 31 of the repeater 30, except the structure to mention specially, the detailed description is abbreviate | omitted.

  In the receiving device 40, basically, the first signal processing unit 47 transmits a radio signal without performing carrier sense in the 426 MHz band. However, when the failure detection unit 44a detects a failure of the first signal processing unit 47, the second signal processing unit 48 transmits / receives a radio signal to / from the repeater 30 in the 950 MHz band. At the time of transmitting a radio signal in the 950 MHz band, the second signal processing unit 48 performs carrier sense by a known method, and transmits a radio signal only when a carrier in the same frequency band is not detected.

  Here, the attachment / detachment structure of the wireless transmission / reception part 41 with respect to the receiver 40 is demonstrated. FIG. 5 is an exploded perspective view for explaining the attachment / detachment structure of the wireless transmission / reception unit 41 with respect to the reception device 40. As shown in FIG. 5, the housing (first housing) 40a of the receiving device 40 is formed with a housing portion 40b which is a recess for detachably housing the wireless transmission / reception unit 41. The unit 40b is provided with a connection terminal 40c (not shown in FIG. 4) for connecting to the control unit side connection unit 49 of the wireless transmission / reception unit 41. On the other hand, the wireless transmission / reception unit 41 is a housing different from the housing 40a of the receiving device 40, and is provided in a housing (second housing) 41a having an outer shape corresponding to the housing unit 40b. Specifically, the antenna side connection unit 46, the first signal processing unit 47, and the second signal processing unit 48 of the wireless transmission / reception unit 41 are accommodated inside the housing 41a, and an antenna is provided outside the housing 41a. 45 and the control part side connection part 49 are arrange | positioned. And in the state which accommodated the radio | wireless transmission / reception part 41 in the accommodating part 40b, the radio | wireless transmission / reception part 41 is connected to the control part 44 by connecting the control part side connection part 49 to the connection terminal 40c.

  Thus, the effect of unitizing the wireless transmission / reception unit 41 is as follows. That is, as described above, the control unit 44 of the receiving device 40 only needs to control the 426 MHz band signal as in the conventional case, and does not need to control the 950 MHz band signal. The signal may be processed and controlled only by the wireless transmission / reception unit 41. Therefore, by unitizing the wireless transmission / reception unit 41, the specific low-power security wireless standard necessary for transmitting / receiving a wireless signal in the 950 MHz band may be acquired only for the wireless transmission / reception unit 41. Since it is not necessary to acquire the wireless standard as a whole, it is possible to easily acquire the wireless standard. In addition, the wireless transmission / reception unit 41 can be unitized so as to have versatility, and the wireless transmission / reception unit 41 can be easily attached to a reception device or a repeater having a configuration different from that of the reception device 40. Is possible. In addition, by adopting the same shape as the unit of the wireless transmission / reception unit of the conventional receiving device 106 only for the 426 MHz band, even when the 950 MHz band is added as the frequency band of the signal to be used, the transmission / reception unit becomes the unit compatible with the 950 MHz band of the present application. By replacing, it is possible to construct a crime prevention system that can easily transmit and receive in a plurality of bands. Furthermore, each part of the receiving device 40 except the wireless transmission / reception unit 41 may be configured to handle only the control of the 426 MHz band signal, etc., as in the prior art, so there is an improvement associated with handling the 950 MHz band signal. It becomes unnecessary.

(Transmission / reception processing)
Next, the details of the radio signal transmission / reception process in the crime prevention system 1 configured as described above will be described. In particular, the following description focuses on the transmission and reception of radio signals between the repeater 30 and the receiving device 40. In the following, “step” is abbreviated as “S”. Unless otherwise specified, transmission / reception processing of the repeater 30 is performed by the control unit 34, and transmission / reception processing of the reception device 40 is performed by the control unit 44. The initial values of the frequency switching flags of the repeater 30 and the receiving device 40 are set to 0.

(Transmission / reception processing-Repeater transmission / reception processing)
First, transmission / reception processing of the repeater 30 will be described. 6 and 7 are flowcharts of the transmission / reception processing of the repeater 30. FIG.

  First, an abnormality detection signal is transmitted from the security sensor 2 without performing carrier sense in the 426 MHz band. Further, a request signal is transmitted from the portable setting device 20 without performing carrier sense in the 426 MHz band.

  On the other hand, the repeater 30 monitors whether or not an abnormality detection signal or a request signal has been received (SA1). When a signal in the 426 MHz band is received, the control unit 34 determines the type of the signal and determines whether or not to relay. Etc. When it is determined that this signal is an abnormality detection signal or a request signal (SA1, Yes), the control unit 34 determines whether the frequency switching flag in the storage unit 32 is 1 (SA2), and the frequency switching. When it is determined that the flag is not 1 (SA2, No), the frequency band used for transmission / reception with the receiving device 40 is assumed to be the 426 MHz band, and the abnormality detection signal or the request signal is set to the frequency band of the 426 MHz band. Then, transmission is performed toward the wireless device 40 without performing carrier sense (SA3).

  Thereafter, when the signal transmitted in SA3 is not a request signal (in the case of an abnormality detection signal) (SA4, No), the control unit 34 of the repeater 30 needs to wait for reception of a confirmation signal from the receiving device 40. If not, the transmission / reception process is terminated.

  On the other hand, when the signal transmitted in SA3 is the request signal (SA4, Yes), the control unit 34 monitors whether the confirmation signal from the receiving device 40 can be received within the first predetermined time ( SA5 to SA7). When the confirmation signal is received within the first predetermined time (SA5, Yes), the request signal transmitted in SA3 is assumed to be received by the receiving device 40, and this confirmation signal is subjected to carrier sense in the 426 MHz band. Without being transmitted to the portable setting device 20 (SA9), and the transmission / reception process is terminated.

  Further, the first predetermined time has elapsed without receiving the confirmation signal (SA7, Yes), and the second predetermined time (> first predetermined time) has elapsed since the first transmission of the request signal. If not (SA8, No), the control unit 34 transmits the request signal again, assuming that the request signal transmitted in SA3 may not be received by the receiving device 40 for some reason (SA3).

  Here, when the second predetermined time has elapsed without first receiving the confirmation signal after transmitting the request signal (SA8, Yes), or before the first predetermined time or the second predetermined time has elapsed. When the frequency switching request signal is received from the receiving device 40 (SA6, Yes), the control unit 34 transmits the signal at SA3 because a failure has occurred in the reception function of the first signal processing unit 47 of the receiving device 40. The request signal has not been received by the receiving device 40, or the request signal transmitted in SA3 has been received by the receiving device 40, but a failure has occurred in the transmission function in the first signal processing unit 47 of the receiving device 40. In this case, the frequency band used for transmission / reception with the receiving device 40 is switched to the 950 MHz band. Specifically, the control unit 34 sets the frequency switching flag in the storage unit 32 to 1 (SA10). In this case, the control unit 34 transmits the request signal after performing carrier sense in the 950 MHz band (SA11). That is, in this case, the request signal is transmitted from the portable setting device 20 to the repeater 30 in the 426 MHz band, and is transmitted from the repeater 30 to the receiving device 40 in the 950 MHz band.

  On the other hand, if it is determined in SA2 that the frequency switching flag = 1 (SA2, Yes), the frequency band used for transmission / reception with the receiving device 40 is assumed to have already been switched to the 950 MHz band. The unit 34 transmits the abnormality detection signal or the request signal received in SA1 after performing carrier sense to the wireless device 40 via the antenna 35 in the frequency band of 950 MHz band (SA11). That is, also in this case, the abnormality detection signal or the request signal is transmitted from the portable setting device 20 to the repeater 30 in the 426 MHz band, and is transmitted from the repeater 30 to the receiving device 40 in the 950 MHz band.

  Thereafter, when the signal transmitted in SA11 is not a request signal (in the case of an abnormality detection signal) (SA12, No), the control unit 34 of the repeater 30 needs to wait for reception of a confirmation signal from the receiving device 40. If not, the transmission / reception process is terminated.

  On the other hand, when the signal transmitted in SA11 is a request signal (SA12, Yes), the control unit 34 monitors whether the confirmation signal from the receiving device 40 can be received within the first predetermined time ( SA13, SA14). If the first predetermined time has elapsed without receiving the confirmation signal (SA14, Yes), the control unit 34 may not have received the request signal transmitted in SA11 for some reason at the receiving device 40. Then, the request signal is transmitted again in the 950 MHz band (SA11).

  Thereafter, SA11 to SA14 are repeated until the confirmation signal is received, and when the confirmation signal is received (SA13, Yes), the control unit 34 sets the confirmation signal in a portable manner without performing carrier sense in the 426 MHz band. The data is transmitted to the apparatus 20 (SA15), and the transmission / reception process is terminated. That is, in this case, the confirmation signal is transmitted from the receiving device 40 to the repeater 30 in the 950 MHz band, and transmitted from the repeater 30 to the portable setting device 20 in the 426 MHz band.

(Transmission / reception processing-Transmission / reception processing of the receiving device)
Next, transmission / reception processing of the receiving device 40 will be described. FIG. 8 is a flowchart of the transmission / reception processing of the reception device 40.

  When the abnormality detection signal from the security sensor 2 or the request signal from the portable setting device 20 is directly received by the receiving device 40 in the 426 MHz band, or these abnormality detection signals or request signals are transmitted through the repeater 30 in the 426 MHz band. Alternatively, when the signal is received in the 950 MHz band (SB1, Yes), the control unit 44 of the reception device 40 performs a predetermined process according to the content of the signal (SB2).

  As part of such processing, the control unit 44 of the receiving device 40 transmits an instruction to turn on the abnormality notification lamp 13 to the first basic processing unit 47b as a command of the first command system as necessary, and this relay Upon receiving the instruction, the first basic processing unit 47b transmits a transfer signal in the 426 MHz band via the antenna 45 without performing carrier sense, and the abnormality notification lamp 13 that has received the transmission signal displays an abnormality notification. . Here, since it is assumed that the abnormality alarm lamp 13 does not have a reception function in the 950 MHz band, a signal is simply transmitted in the 426 MHz band regardless of whether the reception device 40 has a transmission function in the 426 MHz band. However, if the abnormality notification lamp 13 has a reception function in the 950 MHz band, the reception device 40 has a transmission function in the 426 MHz band as in the case of transmission of a confirmation signal described later. Signal transmission to the abnormality notification lamp 13 may be performed in a frequency band according to the above.

  Thereafter, when the signal received in SB1 is not a request signal (in the case of an abnormality detection signal) (SB3, No), the control unit 44 of the receiving device 40 determines that there is no need to transmit a confirmation signal and performs transmission / reception processing. finish.

  On the other hand, when the signal transmitted in SB3 is a request signal (SB3, Yes), the control unit 44 determines whether or not the frequency switching flag in the storage unit 42 is 1 (SB4), and the frequency switching flag. When it is determined that = 1 is not satisfied (SB4, No), the failure detection unit 44a fails in the first signal processing unit 47 assuming that the frequency band used for transmission / reception with the receiving device 40 is the 426 MHz band. Whether or not has occurred is determined (SB5).

  This failure determination can be performed by a known method. For example, an energization test in each part of the first signal processing unit 47 is performed via a test circuit (not shown), or a signal received by the first signal processing unit 47 is received. The level or distortion of the signal may be compared with a predetermined value, or it may be determined that a failure has occurred if no radio wave is received after a predetermined time has elapsed.

  When it is determined that no failure has occurred in the first signal processing unit 47 (SB5, No), the control unit 44 transmits a confirmation signal in the 426 MHz band without performing carrier sense (SB6), and transmits and receives End the process.

  On the other hand, when it is determined that a failure has occurred in the first signal processing unit 47 (SB5, Yes), the control unit 44 sets the frequency switching flag in the storage unit 42 to 1 (SB7), The failure notification output for notifying to the user is performed by sound output and display output via the failure notification unit 50 (SB8). Then, the control unit 44 transmits a frequency switching request signal for requesting the repeater 30 to switch the transmission / reception frequency band from the 426 MHz band to the 950 MHz band after performing carrier sense in the 950 MHz band (SB9). ).

  When the frequency switching request signal is transmitted as described above, or when it is determined in SB4 that the frequency switching flag = 1 (SB4, Yes), the control unit 44 performs carrier sense on the confirmation signal in the 950 MHz band. After performing, it transmits (SB10) and complete | finishes a transmission / reception process.

(effect)
Thus, according to the present embodiment, when a failure of the first signal processing unit 47 is detected by the failure detection unit 44a, the radio signal is transmitted in the second frequency band via the second signal processing unit 48. Since transmission is performed, even when some kind of failure occurs when a signal is transmitted in the first frequency band, the signal is transmitted in the second frequency band, so the reliability of communication can be improved.

  In addition, since the frequency switching request signal is transmitted to the repeater 30, the signals after the point in time when the failure of the first signal processing unit 47 is detected by the failure detecting unit 44a are replaced with the first frequency band. Since reception is possible in two frequency bands, even when a failure occurs in the reception function of the first signal processing unit 47, it becomes possible to receive a signal from the repeater 30 and improve the reliability of communication.

  In addition, when a failure in the first signal processing unit 47 is detected, the fact that the failure has been detected is output, so that the user of the receiving device 40 can be prompted to respond to the failure, and communication Certainty can be increased.

  In addition, when a failure of the first signal processing unit 47 is detected by the failure detection unit 44a of the receiving device 40, a radio signal is transmitted in the second frequency band via the second signal processing unit 48. The certainty of communication using the device 40 can be improved.

[Modifications to Embodiment]
Although the embodiments of the present invention have been described above, the specific configuration and means of the present invention can be arbitrarily modified and improved within the scope of the technical idea of each invention described in the claims. it can. Hereinafter, such a modification will be described.

(About problems to be solved and effects of the invention)
First, the problems to be solved by the invention and the effects of the invention are not limited to the above-described contents, and the present invention solves the problems not described above or has the effects not described above. There are also cases where only some of the described problems are solved or only some of the described effects are achieved.

(About the purpose and type of communication system)
In the above embodiment, the crime prevention system has been described. However, the present invention can be applied to a communication system of any purpose and type other than this, for example, a wireless residential fire as a terminal device in a disaster prevention system. Communication from an alarm device or other battery-powered small wireless device to a receiver as a receiving device, or communication from a portable setting device as a terminal device to an engine starter as a receiving device in an automobile control system Even in this case, the present invention can be applied.

(About devices that perform failure determination and frequency switching)
In the above embodiment, the failure determination of the first signal processing unit 47 is performed only by the receiving device 40, but the failure determination of the transmission function of the first frequency band is similarly performed in other devices including the repeater 30. And based on this result, the transmission frequency band may be switched. For example, the transmission / reception between the security sensor 2 and the repeater 30 has been described as being performed in the 426 MHz band. However, when the security sensor 2 can be improved or replaced, the transmission / reception in the 950 MHz band is performed. In this case, if the repeater 30 has a problem in transmitting data to the security sensor 2 in the 426 MHz band, the transmission may be performed by switching to the 950 MHz band.
When transmitting / receiving a radio signal, if a failure occurs on one source device and the frequency band is changed and transmitted to another device, the receiving device returns in the frequency band used by the source side. Thus, the reply signal can be reliably received by the transmission source device.
When the relationship between the device ID assigned to each device and the standard transmission frequency band (first frequency band) is known, when wireless transmission is performed in a frequency band different from the standard transmission frequency band, The receiving device may determine that the transmission circuit has failed.
When a failure occurs, an abnormality display may be performed in which the failed device is identified by the receiving device 40 or the failed device.
When one of the signal processing units fails, the other signal processing unit may use the frequency band of the other signal processing unit to transmit to the other device itself, after notification in that case. Communication with the faulty device may be performed in the frequency band of the signal processing unit in the normal state.

(About reception and transmission)
In the above-described embodiment, it is mainly detected that a failure has occurred in the signal transmission function. However, when a failure has occurred in the signal reception function, the reception frequency band may be switched.
In the above embodiment, transmission is normally performed in the first frequency band in which carrier sense is not performed, and transmission is performed in the second frequency band in which carrier sense is performed at the time of failure. To perform communication in the reliable second frequency band and perform communication in the first frequency band in which carrier sense is not performed in the event of a failure. In addition, when the transmission speed of the first frequency band is faster than that of the second frequency band, it is usually possible to perform faster communication in the first frequency band and switch to a lower speed in the second frequency band when a failure occurs.

(About signal transmission and reception)
The receiving device 40 receives a signal transmitted from the security sensor 2 in the 426 MHz band and receives a signal transmitted from the repeater 30 or the portable setting device 20 in the 950 MHz band, but does not perform wireless signal transmission. If necessary, signal transmission to a security company or the like may be performed by wire. It is not limited to the numerical value of the frequency band described in the above embodiment.

(Signal frequency band)
In the above embodiment, the 426 MHz band and the 950 MHz band are used together, but the other two frequency bands may be used together, or three or more frequency bands may be used together.

(About modularization)
In the above embodiment, only the wireless transmission / reception unit 41 of the receiving device 40 is unitized, but the wireless transmission / reception unit 31 of the repeater 30 may be unitized by the same structure as the wireless transmission / reception unit 41. Alternatively, as with the wireless transmission / reception unit 31, the wireless transmission / reception unit 41 may be incorporated into the reception device 40 without being unitized.
(Appendix)
The wireless device of Supplementary Note 1 is a wireless device that transmits a wireless signal, and includes a first signal processing unit that performs wireless signal transmission processing in a predetermined first frequency band, and a wireless signal in a predetermined second frequency band. A second signal processing unit that performs transmission processing of the first signal processing unit and a failure detection unit that detects a failure of the first signal processing unit, and the failure detection unit detects no failure of the first signal processing unit The wireless signal is transmitted in the first frequency band through the first signal processing unit, and when a failure of the first signal processing unit is detected by the failure detection unit, the wireless signal is Transmission is performed in the second frequency band through the second signal processing unit.
The wireless device according to supplementary note 2 is a wireless device according to supplementary note 1, wherein when the failure detection unit detects a failure of the first signal processing unit, the wireless device transmits a wireless signal to the wireless device. On the other hand, a frequency switching request signal for requesting transmission in the second frequency band instead of the first frequency band is transmitted in the second frequency band via the second signal processing unit.
The wireless device according to supplementary note 3, in the wireless device according to supplementary note 1 or 2, when a failure of the first signal processing unit is detected by the failure detection unit, a failure of the first signal processing unit is detected A failure notification unit that outputs the effect is provided.
The wireless device according to supplementary note 4 is the wireless device according to any one of supplementary notes 1 to 3, wherein the wireless device receives a wireless signal transmitted from a terminal device or a wireless device transmitted from the terminal device. A receiving apparatus that transmits and receives radio signals to and from a repeater that relays signals.
(Additional effects)
According to the wireless device described in appendix 1, when a failure of the first signal processing unit is detected by the failure detection unit, the wireless signal is transmitted in the second frequency band through the second signal processing unit. Even if a failure occurs when a signal is transmitted in the first frequency band, the signal is transmitted in the second frequency band, so the reliability of communication can be improved.
Further, according to the radio apparatus described in appendix 2, since the frequency switching request signal is transmitted to the other radio apparatus, the signal after the time point when the failure of the first signal processing unit is detected by the failure detection unit. Can be received in the second frequency band instead of the first frequency band, so that even if a failure occurs in the reception function of the first signal processing unit, it becomes possible to receive signals from other wireless devices, The certainty of communication can be improved.
Further, according to the wireless device described in appendix 3, when a failure of the first signal processing unit is detected, the fact that the failure has been detected is output. Response can be promoted, and certainty of communication can be improved.
Further, according to the wireless device described in appendix 4, when a failure of the first signal processing unit is detected by the failure detection unit of the receiving device, the wireless signal is transmitted through the second signal processing unit to the second frequency. Since transmission is performed in a band, the reliability of communication using the receiving device can be improved.

DESCRIPTION OF SYMBOLS 1,100 Security system 2 Security sensor 3 Security terminal 10, 101 Opening / closing sensor 11, 102 Fire sensor 12, 103 Human sensor 13, 104 Abnormal alarm lamp 20 Portable setting apparatus 40a, 41a Case 22 Button group 23 Indicator lamp group 24, 31, 41 Wireless transmission / reception unit 24a, 35, 45 Antenna 26, 32, 42 Storage unit 27, 33, 43 Power supply unit 28, 34, 44 Control unit 28a Signal processing unit 30, 105 Repeater 36, 46 Antenna side connection Unit 37, 47 First signal processing unit 37b, 47b First basic processing unit 38, 48 Second signal processing unit 38b, 48b Second basic processing unit 38c, 48c Compatible processing unit 39, 49 Control unit side connection unit 40, 106 Receiver 40b Housing 40c Connection terminal 44a Failure detection unit 50 Failure notification unit

Claims (3)

A wireless device for transmitting a wireless signal,
A first signal processing unit that performs transmission processing of a radio signal in a predetermined first frequency band;
A second signal processing unit that performs transmission processing of a radio signal in a predetermined second frequency band having a frequency band and a communication speed different from the first frequency band;
A failure detection unit for detecting a failure of the first signal processing unit,
When a failure of the first signal processing unit is not detected by the failure detection unit, a radio signal is transmitted in the first frequency band through the first signal processing unit,
When a failure of the first signal processing unit is detected by the failure detection unit, a radio signal is transmitted in the second frequency band through the second signal processing unit ,
When a failure of the first signal processing unit is detected by the failure detection unit, the second frequency band instead of the first frequency band is transmitted to another wireless device that transmits a wireless signal to the wireless device. Transmitting a frequency switching request signal for requesting transmission in the second frequency band via the second signal processing unit ,
Wireless device. When a failure of the first signal processing unit is detected by the failure detection unit, a failure notification unit that outputs that a failure of the first signal processing unit is detected,
Wireless device of claim 1, further comprising a. The wireless device is a receiving device that receives a wireless signal transmitted from a terminal device or transmits / receives a wireless signal to / from a repeater that relays the wireless signal transmitted from the terminal device.
The wireless device according to claim 1 or 2.

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