JP5856367B2 - 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. 8 is an explanatory diagram for explaining a configuration of a conventional wireless crime prevention system. As shown in FIG. 8, 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. Since it has been specified that such carrier sense is not necessary, in the conventional wireless crime prevention system, each of the sensors 101 to 103 performs wireless transmission without performing carrier sense.

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, so the communication speed is as slow as 1,200 bps, for example. It takes time for the wireless signal transmitted from 103 to reach the receiving apparatus 106, and in particular, it takes time to reach the receiving apparatus 106 via the repeater 105.

  In addition, since each sensor 101 to 103 performs wireless transmission without performing carrier sense, when the number of sensors 101 to 103 is increased, the probability that signals collide due to wireless transmission being performed at the same timing. There is a possibility that a signal having a high radio wave intensity does not reach the repeater 105 or the receiving device 106 due to the increase.

  In order to solve such a problem, 1) a carrier sense function is added to each of the sensors 101 to 103, 2) a wireless transmission frequency band of each sensor has a higher communication speed than the 426 MHz band, and It may be possible to change to a frequency band (for example, 950 MHz band) where carrier sense is obligatory. However, in order to change the functions and frequency bands of the sensors 101 to 103 in this way, the existing sensors 101 to 103 with a large number of installations are replaced, or the new sensors 101 to 103 with many types are designed. It needs to be changed and is not realistic.

  Therefore, the inventor of the present application does not perform carrier sense in the 426 MHz band in the wireless transmission from each of the sensors 101 to 103, and on the other hand, the frequency band of the wireless transmission from the repeater 105 to the receiving device 106 We focused on solving the above problems by setting the 950 MHz band to 950 MHz. That is, when the 950 MHz band is used as described above, the communication speed from the repeater 105 to the receiving apparatus 106 can be improved to, for example, 9,600 bps, and wireless transmission from the repeater 105 or the receiving apparatus 106 is possible. Sometimes, by performing carrier sense, a radio signal can surely reach the receiving apparatus 106, and communication reliability can be improved. In particular, in this case, only the functions of the repeater 105 and the receiving device 106 need to be changed. Since the number and types of the repeater 105 and the receiving device 106 are small compared to the sensors 101 to 103, Easy to apply in reality.

  However, when the 950 MHz band is used as described above, a new problem may occur. That is, in this 950 MHz band communication, it is obliged to perform carrier sense as described above, and signal transmission cannot be performed while a carrier is detected. For this reason, when a plurality of repeaters 105 are used, the probability that a signal cannot be transmitted increases due to the detection of the carrier, until the carrier is no longer detected and the signal can be transmitted. The possibility that time will be required increases, and even if it is a highly urgent signal, it may be prevented from performing quick communication. In addition to this, since various causes for deteriorating the reception status of the radio signal in the receiving apparatus 106 are conceivable, countermeasures for such deterioration of the reception status are required.

  The present invention has been made in view of the above, and enables reception of a signal even when a failure occurs in a reception function of receiving 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 problem and achieve the object, the wireless device according to claim 1 is a wireless device that transmits a wireless signal, and is a predetermined first frequency that is not obligated to perform carrier sense. A first signal processing unit that performs radio signal reception processing in a band, a second signal processing unit that performs radio signal reception processing in a predetermined second frequency band that is obliged to perform carrier sense, Reception of a radio signal in one of the first signal processing unit and the second signal processing unit according to a predetermined frequency band normally used when another radio apparatus transmits a radio signal to the radio apparatus A reception status determination unit that determines the status, and the predetermined frequency band that is normally used when the other radio device transmits a radio signal to the radio device is the second frequency band, and the reception status determination Determined by And wherein when the reception status is judged to be a predetermined reception condition, to the other radio devices, frequency switching requesting to transmit at the first frequency band instead of said second frequency band A request signal is transmitted in the first frequency band .

Also, the radio apparatus according to claim 2, in the radio device according to claim 1, before Symbol reception status determining section, it is one that determines the reception status of a radio signal by the second signal processing unit, When it is detected by carrier sense performed when the second signal processing unit transmits a signal that there is a carrier continuously for a predetermined time or longer, the reception status of the radio signal by the second signal processing unit is determined to be a predetermined reception condition.

According to a third aspect of the present invention, in the wireless device according to the first aspect, the reception status determination unit determines a reception status of a radio signal by the second signal processing unit. When a predetermined number or more of radio signals are received within the time, it is determined that the reception status is the predetermined reception status.

According to a fourth aspect of the present invention, the wireless device according to the first aspect further comprises storage means for storing information for specifying the number of the other wireless devices in the wireless device according to the first aspect. When the number of the other wireless devices specified by the information stored in the storage means is a predetermined number or more, it is determined that the reception status is the predetermined reception status.

  Further, the wireless device according to claim 5 is the wireless device according to any one of claims 1 to 4, wherein the wireless device receives a wireless signal transmitted from a terminal device, or the terminal A receiving device that receives a radio signal from a repeater that relays a radio signal transmitted from a device.

  According to the wireless device according to claim 1, when it is determined that the reception state is the predetermined reception state, transmission is performed in a frequency band different from the frequency band of the radio signal normally transmitted from another wireless device. Since a frequency switching request signal requesting to be transmitted is transmitted, a radio signal is transmitted from the other wireless device in a frequency band different from normal, and it can be expected that the reception situation is improved. , Communication reliability can be increased.

  Further, according to the wireless device of claim 2, when it is detected that a carrier is present in carrier sense for a predetermined time or longer, it is requested to perform transmission in a frequency band for which carrier sense is not required. When a frequency switch request signal is transmitted, a radio signal is transmitted in a frequency band in which carrier sense is not obligated from the other radio device, and carrier sense is performed in the other radio device. Even in a situation where a wireless signal cannot be transmitted, the wireless signal is transmitted from the other wireless device, so that the reliability of communication can be improved.

  In addition, according to the wireless device of the third aspect, since a frequency switching request signal is transmitted when a predetermined number of wireless signals are received within a predetermined time, the number of wireless signals is transmitted from other wireless devices. Therefore, it is expected that a radio signal is transmitted in a frequency band with a small amount of communication, and the reliability of communication can be improved.

  Further, according to the wireless device of the fourth aspect, the frequency switching request signal is transmitted when the number of other wireless devices specified by the information stored in the storage means is equal to or greater than a predetermined number. The wireless signal can be expected to be transmitted from other wireless devices in a frequency band with a small number of wireless devices, and the reliability of communication can be improved.

  Further, according to the radio device according to claim 5, in the receiving device that receives the radio signal transmitted from the terminal device or receives the radio signal from the repeater that relays the radio signal transmitted from the terminal device. Since the reception status can be expected to improve, the reliability of communication can be increased.

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 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.

  Further, the security system 1 of the present embodiment is configured to include a portable setting device 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 place within a range where radio waves reach the indoor repeater 30 or 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 crime prevention 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 security system 1, two frequency bands are used in combination as frequency bands for transmitting and receiving signals. Specifically, the 426 MHz band is used between the security terminal 3 and the receiving device 40 or when the repeater 30 relays both of them. When the portable setting device 20 and the receiving device 40 are mutually connected or when the repeater 30 relays both of them, the 950 MHz band with the higher communication speed is basically used. However, even in the case where the 950 MHz band is to be used in this way, the 426 MHz band is used when the reception state of the radio signal in the 950 MHz band in the receiving apparatus 40 becomes a predetermined state. 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. In general, the frequency band in which carrier sense is performed has higher communication reliability because communication is performed when there is no other radio signal.

(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 950 MHz band, and includes a dedicated antenna 24a in the 950 MHz band. The speaker 25 outputs an alarm sound. The storage unit 26 is configured by, for example, a flash memory (the same applies to storage units 32 and 42 described later), and stores programs and parameters necessary for control of 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. When transmitting a radio signal, the signal processing unit 28a performs carrier sense by a known method, and transmits the radio signal only when radio in the same frequency band is not detected.

  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. . 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, when 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 radio device for a security system to receive. 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. In particular, the storage unit 32 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 frequency switching flag = 1. In this case, transmission / reception is performed in the 426 MHz band (the same applies to the frequency switching flag of the receiving device 40). The storage unit 32 stores a device table. The device table is a table for identifying devices to be relayed. For example, the device table is assigned to each of these devices in advance to uniquely identify the security sensor 2, the portable setting device 20, or the receiving device 40. The identified identification number is associated with information indicating the relay operation for each device. 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.

  The repeater 30 transmits and receives radio signals to and from the security sensor 2 without performing carrier sense in the 426 MHz band. On the other hand, the repeater 30 transmits a radio signal without performing carrier sense in the 426 MHz band when relaying the signal from the security sensor 2 between the receiving device 40 and the portable setting device 20. When relaying the signal, the wireless signal is transmitted after performing carrier sense in the 950 MHz band. However, even when the signal from the portable setting device 20 is relayed, when a frequency switching request signal described later is received from the receiving device 40, the wireless signal is transmitted without performing carrier sense in the 426 MHz band. .

  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, and a control unit 44. The storage unit 42 stores programs and parameters necessary for controlling the receiving device 40. In particular, the storage unit 42 stores a frequency switching flag and a device table. The device table is a table for identifying devices to be received. For example, in order to uniquely identify the security sensor 2, the portable setting device 20, or the repeater 30, the device table is assigned to each device in advance. The identified identification number is associated with information indicating the reception operation for each device. 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 reception status determination unit 44a. The reception status determination unit 44a includes a predetermined frequency band (here, which is normally used when the repeater 30 transmits a radio signal to the reception device 40 among the first signal processing unit 47 and the second signal processing unit 48 described later). Then, the reception status of the radio signal is determined in either one (here, the second signal processing unit 48) according to 950 MHz.

  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.

  The receiving device 40 transmits a radio signal to the abnormality notification lamp 13 without performing carrier sense in the 426 MHz band. On the other hand, the receiving device 40 performs transmission / reception of a radio signal transmitted from the repeater 30 in the 426 MHz band between the repeater 30 and the radio signal transmitted from the repeater 30 in the 950 MHz band. The transmission / reception is performed in the 950 MHz band. However, regarding the transmission / reception of the radio signal transmitted from the repeater 30 in the 950 MHz band, when the reception status determination unit 44a determines that the reception status of the second signal processing unit 48 is a predetermined status, the transmission is performed in the 426 MHz band. . Here, the predetermined situation is a situation in which it is difficult for the second signal processing unit 48 to receive a signal transmitted in the 950 MHz band, and there is a high possibility that the signal cannot be properly received (hereinafter, a reception difficulty situation).

  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 41 of the receiving device 40, and is provided in an outer housing (second housing) 41a 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. FIG. 6 is a flowchart of the transmission / reception processing of the repeater 30.

  First, an abnormality detection signal is transmitted from the security sensor 2 without performing carrier sense in the 426 MHz band. The portable setting device 20 transmits a request signal after performing carrier sense in the 950 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 any one of the signals is received, the control unit 34 determines the type of the signal or determines whether a relay is necessary. Etc. When it is determined that this signal is an abnormality detection signal or a request signal (SA1, Yes), when the signal is not a request signal (when it is an abnormality detection signal) (SA2, No), the control unit 34 The abnormality detection signal is transmitted toward the receiving device 40 without performing carrier sense at a frequency of 426 MHz band (SA3).

  Alternatively, when the signal is a request signal (SA2, Yes), the control unit 34 determines whether or not the frequency switching flag in the storage unit 32 is 1 (SA4), and determines that the frequency switching flag = 1 is not satisfied. If it is determined (SA4, No), the frequency band used for transmission / reception with the receiving apparatus 40 is assumed to be a 950 MHz band, and the request signal is subjected to carrier sense at a frequency of 950 MHz band, and then the receiving apparatus 40 (SA5).

  Thereafter, the control unit 34 monitors whether or not the confirmation signal from the receiving device 40 can be received within the first predetermined time (SA6 to SA8). If the confirmation signal is received within the first predetermined time (SA6, Yes), it is assumed that the request signal transmitted in SA5 has been received by the receiving device 40, and this confirmation signal is subjected to carrier sense in the 950 MHz band. Then, it is transmitted to the portable setting device 20 (SA10), and the transmission / reception process is terminated.

  In addition, when the first predetermined time has elapsed without receiving the confirmation signal (SA8, Yes), the control unit 34 may not have received the request signal transmitted in SA5 for some reason at the receiving device 40. Then, the request signal is transmitted again (SA5).

  Alternatively, when the frequency switching request signal from the receiving device 40 is received in the 426 MHz band before the first predetermined time has elapsed (SA7, Yes), the control unit 34 causes the second signal processing unit of the receiving device 40 to Since the reception status at 48 is poor and the request signal transmitted at SA5 may not be received by the receiving device 40, the frequency band used for transmission / reception with the receiving device 40 is switched to the 426 MHz band. Specifically, the control unit 34 sets the frequency switching flag in the storage unit 32 to 1 (SA9), and then proceeds to SA4.

  Thus, after setting the frequency switching flag to 1 or when it is determined in SA4 that the frequency switching flag = 1 (SA4, Yes), the control unit 34 detects the request signal in the 426 MHz band by carrier sense. (SA11). That is, in this case, the request signal is transmitted from the portable setting device 20 to the repeater 30 in the 950 MHz band, and transmitted from the repeater 30 to the receiving device 40 in the 426 MHz band.

  After that, when a confirmation signal is received (SA6, Yes), the control unit 34 performs carrier sense in the 950 MHz band, transmits the confirmation signal to the portable setting device 20 (SA10), and ends the transmission / reception process. To do.

(Transmission / reception processing-Transmission / reception processing of the receiving device)
Next, transmission / reception processing of the receiving device 40 will be described. FIG. 7 is a flowchart of the transmission / reception processing of the receiving device 40.

  The abnormality detection signal output from the security sensor 2 is directly received by the receiving device 40 or received via the repeater 30 in the 426 MHz band. Alternatively, the request signal output from the portable setting device 20 is directly received by the receiving device 40 in the 950 MHz band, or is received via the repeater 30 in the 426 MHz band or 950 MHz band. In any of these cases (SB1, Yes), the control unit 44 of the receiving 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. .

  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 reception status determination unit 44a determines that the frequency band used for transmission / reception with the reception device 40 is the 950 MHz band, and the reception status determination unit 44a It is determined whether or not the reception status is difficult to receive (SB5). This determination can be performed by a known method as long as the degree of difficulty of receiving the signal transmitted in the 950 MHz band by the second signal processing unit 48 is determined. To the third determination in sequence.

  The first determination is made based on the time when the carrier is continuously detected in the carrier sense of the second signal processing unit 48. Specifically, the reception status determination unit 44a causes the second signal processing unit 48 to perform carrier sense by a known method, and determines whether or not the presence of a carrier is continuously detected for a predetermined time or more. If it is not detected continuously for a predetermined time or more, it is determined that the reception status of the radio signal in the second signal processing unit 48 is not a difficult reception status. The reception status of the radio signal in the signal processing unit 48 is determined to be a difficult reception status. Such a determination is made when the presence of a carrier is detected continuously for a predetermined time or longer, since the carrier is also detected on the repeater 30 side in the same manner, so that a radio signal in the 950 MHz band is used. This is because it can be estimated that it is difficult to transmit the signal, and as a result, it can be estimated that it is difficult for the receiving device 40 to receive the radio signal. The carrier sense of the second signal processing unit 48 may be performed again in SB5, but the past carrier sense result is stored in the storage unit 42 together with the time stamp, and the past stored in the storage unit 42 is stored. The latest result may be acquired from the results, and the determination may be performed based on the acquired past result. In this case, the time for performing the carrier sense again can be omitted. However, since the past results performed at a time away from the time of SB5 may differ from the reception status at the time of SB5, there is a past result within a predetermined time from the time of SB5. Only the past result may be used (same in the second determination).

  The second determination is made based on the number of radio signals received within a predetermined time by the second signal processing unit 48. Specifically, the reception status determination unit 44a counts the number of radio signals received by the second signal processing unit 48 for a predetermined time, and if the counted number of radio signals is not equal to or greater than the predetermined number, It is determined that the reception status of the radio signal in the two-signal processing unit 48 is not a difficult reception status. If the reception status is greater than or equal to a predetermined number, the reception status of the radio signal in the second signal processing unit 48 is determined to be a difficult reception status. To do. This determination is performed because it is possible to estimate that it is difficult for the receiving device 40 to receive a radio signal because the possibility of signal collision increases when the number of radio signals is large. . The number of radio signals received by the second signal processing unit 48 may be counted again in SB5, but the number of radio signals received in the past within a predetermined time is stored in the storage unit 42 together with a time stamp. The latest result may be acquired from the past results stored in the storage unit 42, and the determination may be performed based on the acquired past result. In this case, the number of radio signals may be determined. It is possible to omit the time for performing the counting again.

  The third determination is performed based on the number of other wireless devices specified by the information stored in the storage unit 42. Specifically, the reception status determination unit 44a refers to the device table stored in the storage unit 42, counts the number of identification numbers included in the device table, and the number of the counted identification numbers is predetermined. If the number is not greater than or equal to the number, it is determined that the radio signal reception status in the second signal processing unit 48 is not a difficult reception status. If the number is greater than or equal to the predetermined number, the radio signal reception status in the second signal processing unit 48 is determined. Is determined to be in a reception difficult situation. Such a determination is made when the number of identification numbers is large when the wireless device (in this case, the security sensor 2, the portable setting device 20, or the repeater 30) that should perform the receiving operation in the receiving device 40. This is because it is estimated that it is difficult for the receiving device 40 to receive a radio signal because the possibility of signal collision increases.

  The reception status determination unit 44a performs such first to third determinations, and when it is determined in at least one determination that the reception status of the radio signal in the second signal processing unit 48 is a difficult reception status. Suppose that the reception status is a difficult reception status as a final determination result.

  When it is determined that the reception state is a difficult reception state (SB5, Yes), the control unit 44 sets the frequency switching flag of the storage unit 42 to 1 (SB7), and the transmission / reception frequency band for the repeater 30 is set. A frequency switching request signal for requesting switching from 426 MHz band to 950 MHz band is transmitted in the 426 MHz band (SB8). As described above, the frequency switching request signal is transmitted in the 426 MHz band when the reception status in the 950 MHz band is difficult to receive in the receiving device 40, the reception status in the 950 MHz band is also similarly used in the repeater 30. Is assumed to be a difficult reception situation, but if such an assumption is not made, transmission may be performed in the 950 MHz band.

  When the frequency switching request signal is transmitted in this way, 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 426 MHz band. Transmission is performed without performing (SB9), and the transmission / reception processing is terminated.

(effect)
As described above, according to the present embodiment, when it is determined that the reception state is the predetermined reception state, transmission is performed in a frequency band different from the frequency band of the radio signal normally transmitted from the repeater 30. Since a frequency switching request signal for requesting the transmission is transmitted, a radio signal is transmitted from the repeater 30 in a frequency band different from the normal frequency, and it can be expected that the reception situation is improved. Can increase the sex.

  In addition, when it is detected that there is a carrier for a predetermined time or more in carrier sense, a frequency switching request signal is transmitted to request transmission in a frequency band for which carrier sense is not required. The radio signal is transmitted from the frequency band in which the carrier sense is not obligated from the device 30, and even if the radio signal cannot be transmitted when the carrier sense is performed in the repeater 30, the relay signal is relayed. Since the radio signal is transmitted from the device 30, the certainty of communication can be improved.

  In addition, since a frequency switching request signal is transmitted when a predetermined number or more of radio signals are received within a predetermined time, a radio signal may be transmitted from the repeater 30 in a frequency band with a small number of radio signals. It can be expected and communication reliability can be improved.

  In addition, since the frequency switching request signal is transmitted when the number of other wireless devices specified by the information stored in the storage unit 42 is a predetermined number or more, the number of wireless devices is determined from the repeater 30. It can be expected that a radio signal is transmitted in a small frequency band, and the reliability of communication can be improved.

  Further, the wireless signal transmitted from the security sensor 2 or the portable setting device 20 is received, or the wireless signal is received from the repeater 30 that relays the wireless signal transmitted from the security sensor 2 or the portable setting device 20. Since it can be expected that the reception status is improved in the receiving device 40, the reliability of communication can be increased.

[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 a warning 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 equipment that performs reception status determination and frequency switching)
In the above embodiment, it is assumed that the reception status is determined only by the receiving device 40. However, in other devices including the repeater 30, the determination of the reception status by the second frequency band is similarly performed, and based on this result. Thus, the frequency switching request signal may be output to another wireless device. 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 it becomes difficult for the repeater 30 to receive a signal in the 950 MHz band from the security sensor 2, the repeater 30 switches the frequency band to the 426 MHz band. A frequency switching request signal may be transmitted to the security sensor 2.

(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.

(Signal frequency band)
In the above-described 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. In the above embodiment, when the reception status of the 950 MHz band becomes difficult to receive, switching to the 426 MHz band is performed, but conversely, transmission / reception is basically performed in the 426 MHz band. When the reception status of the band becomes difficult to receive, it may be switched to the 950 MHz band.

(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 reception processing of a wireless signal in a predetermined first frequency band, and a wireless signal in a predetermined second frequency band. A predetermined frequency that is normally used when another wireless device transmits a wireless signal to the wireless device among the second signal processing unit that performs reception processing of the first signal processing unit and the second signal processing unit A reception status determination unit that determines the reception status of a radio signal in any one of the bands, and when the reception status determined by the reception status determination unit is determined to be a predetermined reception status And transmitting to the other radio device in a frequency band different from the frequency band of the radio signal normally transmitted from the other radio device, out of the first frequency band and the second frequency band. Transmit frequency switching request signal That.
Further, in the wireless device of Supplementary Note 2, in the wireless device of Supplementary Note 1, the first frequency band is a frequency band that is not obligated to perform carrier sense, and the second frequency band is a carrier sense. The frequency band that is obliged to be performed, and the predetermined frequency band that is normally used when the other radio apparatus transmits a radio signal to the radio apparatus is the second frequency band, and the reception status determination The unit determines the reception status of the radio signal by the second signal processing unit, and it is determined that a carrier is present for a predetermined time or more by carrier sense performed when the second signal processing unit transmits a signal. If it is detected continuously, it is determined that the radio signal reception status by the second signal processing unit is the predetermined reception status, and the reception status determined by the reception status determination unit is determined. If it is determined that the reception status, to the other wireless device, sends a frequency switching request signal for requesting to perform the transmission at the first frequency band instead of said second frequency band.
The wireless device according to supplementary note 3 is the wireless device according to supplementary note 1 or 2, wherein the reception status determining unit is configured such that, among the first signal processing unit and the second signal processing unit, another wireless device is the wireless device. When a predetermined number or more of radio signals are received within a predetermined time in any one of the predetermined frequency bands normally used when transmitting a radio signal to the device, the reception status is the predetermined reception status Is determined.
Further, the wireless device according to supplementary note 4 is the wireless device according to any one of supplementary notes 1 to 3, comprising storage means for storing information for specifying the number of the other wireless devices, wherein the reception status determination The unit determines that the reception state is the predetermined reception state when the number of the other wireless devices specified by the information stored in the storage unit is a predetermined number or more.
Further, the wireless device according to supplementary note 5 is the wireless device according to any one of supplementary notes 1 to 4, wherein the wireless device receives a wireless signal transmitted from a terminal device or is transmitted from the terminal device. The receiving device receives a radio signal from a repeater that relays the received radio signal.
(Additional effects)
According to the radio apparatus described in appendix 1, when it is determined that the reception situation is a predetermined reception situation, transmission is performed in a frequency band different from the frequency band of radio signals normally transmitted from other radio apparatuses. Since the frequency switching request signal that requests that is transmitted, wireless signals will be transmitted from the other wireless device in a different frequency band, and it can be expected that the reception situation will be improved. The certainty of communication can be improved.
Further, according to the radio apparatus described in Appendix 2, when it is detected that a carrier is present in carrier sense continuously for a predetermined time or longer, transmission is requested in a frequency band for which carrier sense is not obligated. Since a frequency switching request signal is transmitted, a radio signal is transmitted in a frequency band in which carrier sense is not obligated from the other wireless device, and when carrier sense is performed in the other wireless device. Even if the wireless signal cannot be transmitted, the wireless signal is transmitted from the other wireless device, so that the reliability of communication can be improved.
Further, according to the radio apparatus described in appendix 3, when a predetermined number or more of radio signals are received within a predetermined time, the frequency switching request signal is transmitted. Therefore, the number of radio signals from other radio apparatuses is increased. It can be expected that a radio signal is transmitted in a small frequency band, and the reliability of communication can be improved.
Further, according to the wireless device described in appendix 4, when the number of other wireless devices specified by the information stored in the storage unit is equal to or greater than a predetermined number, the frequency switching request signal is transmitted. It can be expected that radio signals are transmitted from other radio apparatuses in a frequency band with a small number of radio apparatuses, and the reliability of communication can be improved.
Further, according to the wireless device described in Appendix 5, in the receiving device that receives the wireless signal transmitted from the terminal device or receives the wireless signal from the repeater that relays the wireless signal transmitted from the terminal device, Since the reception situation can be expected to be improved, the certainty of communication 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 light 20 Portable setting apparatus 40a, 41a Case 22 Button group 23 Indicator light 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 Receiving device 40b accommodating portion 40c connection terminal 44a reception status determining portion

Claims (5)

A wireless device for transmitting a wireless signal,
A first signal processing unit that performs radio signal reception processing in a predetermined first frequency band that is not obligated to perform carrier sense;
A second signal processing unit that performs radio signal reception processing in a predetermined second frequency band that is required to perform carrier sense;
Of the first signal processing unit and the second signal processing unit, radio signals in one of the first signal processing unit and the second signal processing unit according to a predetermined frequency band that is normally used when another radio device transmits a radio signal to the radio device. A reception status determination unit for determining the reception status;
The predetermined frequency band that is normally used when the other wireless device transmits a wireless signal to the wireless device is the second frequency band,
When it is determined that the reception status determined by the reception status determination unit is a predetermined reception status, for the other radio apparatus, the first frequency band is used instead of the second frequency band. Transmitting a frequency switching request signal for requesting transmission in the first frequency band;
Wireless device. Prior Symbol reception status determining section, be one that determines the reception status of a radio signal by the second signal processing unit, the carrier sense performing in the second signal processing unit to transmit a signal, there is a carrier it is determined if it is detected continuously more than a predetermined time, the reception status of a radio signal by the second signal processing unit is in the predetermined reception conditions,
The wireless device according to claim 1. The reception status determining unit is configured to determine a radio signal reception status by the second signal processing unit, and when a predetermined number of radio signals are received within a predetermined time, the reception status is the predetermined reception status. To determine the situation,
The wireless device according to claim 1. Storing means for storing information for specifying the number of the other wireless devices;
The reception status determination unit determines that the reception status is the predetermined reception status when the number of the other wireless devices specified by the information stored in the storage unit is a predetermined number or more. ,
The wireless device according to claim 1. The wireless device is a receiving device that receives a wireless signal transmitted from a terminal device or receives a wireless signal from a repeater that relays the wireless signal transmitted from the terminal device.
The radio | wireless apparatus as described in any one of Claim 1 to 4.

Images