JP3647618B2 - Wireless relay device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wireless security system, and more particularly to a relay device that wirelessly relays detection information of various sensors to a controller.
[0002]
[Prior art]
Conventionally, a security system includes a controller that performs a reporting operation to a security center via a telephone line, various sensors such as an intrusion sensor and a fire detector, and a relay device that relays wireless signals between the controller and the various sensors. . Note that the relay device is installed when the wireless signal of the sensor cannot be received directly by the controller.
[0003]
The security system operates as follows. When the intrusion sensor detects an intruder, the intrusion sensor transmits detection information as a radio signal to the relay device. Then, the relay device that has received this wireless signal relays and transmits detection information to the controller. Then, the controller that has received the detection information reports the occurrence of an intrusion abnormality to the security center via a telephone line.
[0004]
[Problems to be solved by the invention]
When the security area reaches a wide range, the range that can be relayed by one relay device is limited, and thus the sensor detection information needs to be transmitted to the controller via a plurality of relay devices. In this case, depending on the arrangement of the sensor and the relay device, the detection information of one sensor may be received by a plurality of relay devices, and each of the received relay devices may further relay and transmit a radio signal. That is, there is only one detection information, but there are a plurality of relayed radio signals.
[0005]
Thus, while one relayed radio signal is originally sufficient, a plurality of unnecessary radio signals are transmitted, and the amount of communication in the security area increases. Furthermore, since all radio signals transmitted by relay are concentrated on the controller, collisions of radio signals received by the controller frequently occur. In addition, when an intruder exists, a plurality of intrusion sensors often detect the intruder, and the possibility that the relay signals collide with each other increases. When this collision occurs, the controller or the relay device cannot receive or recognize the detection information accurately.
[0006]
Therefore, in the worst case, the detection information does not reach the controller well, and the reliability of the security system may be reduced.
[0007]
Therefore, an object of the present invention is to realize a security system that reduces the amount of communication and reliably transmits detection information of various sensors by preventing relay transmission of useless radio signals.
[0008]
[Means for Solving the Problems]
A relay device used in a radio system for transmitting a radio signal via a plurality of relay devices, a receiving means for receiving a radio signal, hierarchical data included in reception information in the radio signal, own hierarchical data, A determination means for determining whether the signal is from a lower-layer device, a reception information storage means for storing the received information when the determination means determines that the signal is from a lower-layer device, and Provided is a relay device having a transmission means for wireless transmission by adding its own hierarchical data to all or a part of the reception information stored in the reception information storage means.
[0009]
Then, the relay device operates so as to relay and transmit only signals from devices in lower layers than its own layer. Therefore, relay transmission is not performed even if a radio signal is received from a device in a higher hierarchy or a peer hierarchy than its own hierarchy, so that useless relay transmission can be eliminated. Here, a radio signal from a higher-layer or peer-layer device than its own layer is a signal that does not require relaying that has already been transmitted to the upper-layer relay device by the wireless signal.
[0010]
Further, the relay apparatus further determines that the radio signal received by the determination means by the determination means is a radio signal from a device of the same hierarchy or higher hierarchy, and has already received reception information of the same content A deletion unit that deletes the reception information stored in the reception information storage unit, and the transmission unit transmits the data after storing in the reception information storage unit after a lapse of a predetermined time for each relay device. A relay device is provided. Then, when the relay device has already received the same information as the reception information from the device of the peer layer or the upper layer from the device of the lower layer, the relay information is deleted. Furthermore, since the relay device has different relay transmission timings for each relay device, even if the same information is received almost simultaneously by a plurality of relay devices, the relay device will not be relayed at the same time. If the relay device receives the wireless signal relayed first, the relay transmission of the reception information having the same content can be stopped. As a result, radio signals having the same reception information do not collide with each other, and unnecessary relay transmission of radio signals can be reduced.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings, taking a security system as an example. FIG. 1 shows the overall configuration of the security system. In the security system, the controller 2 and the security center 5 are connected by a communication line 4 such as a telephone line. And, in the security area A, the sensor transmitter 3 that is appropriately installed in a place where there is a risk of intrusion into the security area A or a place where there is a risk of fire, and transmits as a wireless signal including detection information, When a wireless signal including detection information from the sensor transmitter 3 is received, the relay apparatus 1 that relays the detection information by a wireless signal, and wireless including the detection information transmitted from the relay apparatus 1 or the sensor transmitter 3 A controller 2 for receiving a signal and reporting to the security center 5 via the telephone line 4 is installed.
[0012]
The sensor transmitter 3 will be described with reference to FIG.
[0013]
The sensor transmitter 3 detects detection signals from various sensors 31 and 31 such as an intrusion sensor that detects an intrusion by detecting the opening of a human body, a window, a door, and the like, a fire detector that detects heat and smoke, and a gas leak detector. Sensor I / F 32 that receives the data, a storage unit 33 including a ROM / RAM, a transmission unit 34 that converts detection information of the sensor 31 into a wireless signal and wirelessly transmits the signal via an antenna 37, a CPU that controls these, and The controller 35 includes a peripheral circuit, and a battery 36 that supplies power to them.
[0014]
The sensor 31 may be a button so that a human can transmit an abnormal signal according to his / her own intention. The sensor 31 may be built in the sensor transmitter 3.
[0015]
The storage unit 33 stores the type of the sensor 31, the individual identification code assigned to each sensor transmitter 3 and the relay device 1, the frame identification code determined for each transmission frame, the operation program of the sensor transmitter 3, and the like. Yes. Here, the transmission frame will be described. The transmission frame is a unit for transmitting the detection information of the sensor 31. A frame identification code is determined for each transmission frame. Therefore, the frame identification code is used to specify detection information.
[0016]
When the sensor transmitter 3 configured as described above receives an input of the detection signal from the sensor 31 by the sensor I / F 32, the sensor transmitter 3 has its own individual identification code, frame identification code, sensor 31 stored in the storage unit 33. The detection information such as the type and address of the mobile phone is converted from the transmission unit 34 into a radio signal and transmitted.
[0017]
Next, the relay device 1 will be described with reference to FIG. The relay apparatus 1 includes a hierarchy setting unit 11 that sets its own hierarchy, which will be described later, using a DIP switch, a storage unit 12 that includes a ROM / RAM and stores its own individual identification code, received information, programs, and the like, and detection information Is transmitted to the wireless signal to be transmitted from the antenna 17, and the wireless signal transmitted from the other relay device 1 or the sensor transmitter 3 is received from the antenna and can be processed by the CPU. The receiver 14 is converted to the control unit 15, the control unit 15 includes a CPU and peripheral circuits for controlling them, and the battery 16 supplies power to them.
[0018]
Here, the hierarchy of the relay apparatus 1 will be described. As shown in FIG. 1, the hierarchical data is determined according to the order in which the relay device 1 relays the detection information transmitted by the sensor transmitter 3 to the controller 2. That is, the hierarchy determines the relay apparatus 1 that relays radio signals to the controller 2 in order of the first hierarchy, and the relay apparatus 1 that relays and transmits the relay signal 1 to the relay apparatus 1 of the first hierarchy in order of the second hierarchy. Therefore, there may be a plurality of relay devices 1 or a single relay device 1 in the same hierarchy. The storage unit 12 includes a reception buffer that stores the reception information received by the reception unit 14 and a reception history buffer that stores a predetermined number of pieces of reception information stored in the reception buffer. Since all the layers of the sensor transmitter 3 are determined in advance as the lowest layer, the radio signal transmitted by the sensor transmitter 3 is received by all the relay apparatuses 1 within the range where the radio signal reaches.
[0019]
In the present embodiment, the hierarchy is set by the dip switch so that the hierarchy can be easily set / changed even after the relay apparatus 1 is installed, but may be stored in the storage unit 12 in advance. In this case, when the setting data of the relay device 1 such as the individual identification code and the used frequency is transmitted from the controller 2 to the relay device 1, a method including setting the hierarchical data is adopted.
[0020]
Next, the operation of the relay apparatus 1 configured as described above will be described with reference to FIGS. 5 and 6. FIG. 5 shows the reception operation of the relay device 1. The relay device 1 is waiting to receive a radio signal transmitted from the sensor transmitter 3 or other relay device 1 in the security area A (step S51). Although not particularly described, whether or not the signal is valid in the security area A is identified by a radio signal header and a signal frequency.
[0021]
And if it determines with having received the radio signal from the effective sensor transmitter 3 grade | etc., In the security area A, a reception process (step S52) will be performed. Thereafter, the hierarchy data included in the received information is compared with the hierarchy set in the hierarchy setting unit 11, and it is determined whether or not the hierarchy data is lower than the self, that is, the hierarchical data with a number higher than the self (step S53).
[0022]
If it is determined that the wireless signal is from the lower layer relay apparatus 1, the process proceeds to step S54. In step S54, the frame identification code stored in the reception history buffer is compared with the frame identification code included in the reception information, and whether the reception information already received is duplicated, that is, whether a duplicate frame is received. judge. If it is not a duplicate frame, the reception information is stored in the reception buffer and the reception history buffer in step S55. On the other hand, if it is determined in step S54 that the frame is an overlapping frame, the process returns to step S51 without storing.
[0023]
Therefore, the determination of duplicate frames can be made such that detection information already relayed is not relayed again by referring to the reception history buffer. Although the reception history buffer is referred to in the processing described later, the relay device 1 deletes the reception information from the reception buffer when relay transmission is performed. It is because it cannot be judged. Further, if only the frame identification code is stored in the reception history buffer, there is an advantage that the reception history can be stored with a small capacity.
[0024]
If it is determined in step S53 that the signal is not a signal from the relay device 1 in a lower layer than itself, that is, if the signal is from the same layer or an upper layer, the frame identification code of the reception buffer and the reception are received in step S56. The frame identification code of the information is checked to determine whether or not it is a duplicate frame. If it is determined that there is a duplicate frame, the reception information stored in the reception buffer is deleted (step S57), and the process returns to step S51. As a result, the same detection information that has already been relayed and transmitted by the relay device 1 in the peer hierarchy or higher hierarchy is not relayed and wasteful transmission can be eliminated. On the other hand, if there is no frame overlap in step S56, nothing is done and the process returns to step S51.
[0025]
Next, the transmission process of the relay device 1 will be described with reference to FIG. The relay device 1 constantly monitors whether there is reception information in the reception buffer, and waits until the reception information is stored in the reception buffer (step S61). When the reception information is stored in the reception buffer, timing of a predetermined time is started (step S62). Here, the predetermined time is a time that is different for each relay device 1, in order to prevent the relay devices from transmitting at the same timing even if the relay device 1 receives the same detection information at the same time. This is the meeting time.
[0026]
Thereafter, in step S63, it is determined whether the reception information in the reception buffer has been deleted. This is because it is determined whether or not the duplicate frame is deleted in step S57 when the reception information from the relay device 1 of the peer hierarchy or the upper hierarchy in step S57 in FIG. 5 is duplicated in the reception buffer. ing. That is, if another relay apparatus 1 in the peer hierarchy or the upper hierarchy has finished relay transmission of the received information, it is not necessary to relay the received information, so the process returns to step S61 and the next radio signal arrives. Wait for. The determination in step S63 is performed for a predetermined time (step S64), and when the predetermined time elapses, a radio signal is transmitted from the transmission unit 13 with a header attached to data as shown in FIG. 7 (step S65). Then, the reception information is deleted from the reception buffer (step S66), and the process returns to step S61 to wait for the arrival of the next radio signal.
[0027]
Here, with reference to FIG. 7, the transmission data relay-transmitted by the relay device 1 will be described. The figure shows information contents included in transmission data transmitted by the relay device 1. The hierarchy data 71 is its own hierarchy data set in the hierarchy setting unit 11. The individual identification code 72 is a code that is different for each relay device 1 stored in advance in the storage unit 12. The frame identification code 73 is a frame identification code included in the received signal, and is a code for specifying the detection information transmitted by the sensor transmitter 3. The detection information 74 is the detection state of the sensor 31 connected to the sensor transmitter 3, the type of the sensor, the address of the sensor 31, and the like.
[0028]
The transmission data of the sensor transmitter 3 has almost the same content, but all the hierarchical data is set as the lowest hierarchy.
[0029]
Next, the controller 2 will be described with reference to FIG. In the figure, the display unit 21 is composed of an LED and an LCD, and displays the state of the security area (during security setting or security cancellation, etc.), the presence / absence of an abnormality, device maintenance information, and the like. The operation unit 22 includes a numeric keypad, a card reader, and the like, and is an operation unit that is operated by a regular user or a coping person in the security area. For example, it is a means for inputting a personal identification code or reading data of an ID card when the security area is shifted from the security release to the security set or vice versa. The transmission unit 23 converts various setting data from the controller 2 into a radio signal and transmits it from the antenna 28 when setting data in the relay device 1. The receiving unit 24 receives a radio signal transmitted from the relay device 1 or the sensor transmitter 3 and converts it into an electrical signal that can be processed by the control unit 27. The storage unit 26 is composed of ROM / RAM, and stores various data and programs such as the current state of the security mode, detection history, and security system program. The reporting unit 25 is composed of a dial relay or the like, and issues an abnormality report to the telephone number of the security center 5 stored in the storage unit 26 via the telephone line 4. The control unit 27 includes a microcomputer that controls each of the above-described units and its peripheral circuits, and controls the entire controller 2. And when the controller 2 receives the detection information from the relay device 1 or the sensor transmitter 3 at the receiving unit 14, the controller 2 determines the content of the received signal, the security mode state of the current security area, etc. While displaying an abnormality on the display unit 21, the reporting unit 25 reports to the security center 5 via the telephone line 4.
[0030]
The overall operation of the security system configured as described above will be described with reference to FIG.
[0031]
Now, it is assumed that the security area is in a normal state in the security set, and each relay apparatus 1 has no signal to be relayed. The relay device 1A is set in the layer setting unit 11 for the third layer, the relay devices 1B and 1C for the second layer, and the relay devices 1D and 1E for the first layer. Furthermore, the setting of the predetermined time of the relay device 1 is set so as to increase in the order of the relay devices 1A, 1B, 1C, 1D, and 1E. Assume that the sensor transmitter 3A detects an intruder in such a state. The sensor transmitter 3A converts a detection signal including its own individual identification code, frame identification code, and intruder detection information stored in the storage unit 33 from the transmission unit 34 into a radio signal, and transmits it. This radio signal is received almost simultaneously by the relay apparatuses 1A, 1B, and 1C.
[0032]
Next, the operation of each relay apparatus 1A, 1B, 1C that has received a radio signal will be described.
[0033]
The relay device 1A performs the reception operation described in FIG. 5 and stores the reception information in the reception buffer. Then, the transmission operation of FIG. 6 is performed. Waiting for a predetermined time shorter than the received relay devices 1B and 1C, the hierarchical data 71 and the detection information 74 shown in FIG. 7 are relayed and transmitted as radio signals.
[0034]
Further, the relay device 1B performs the reception operation described in FIG. 5 and stores the reception information in the reception buffer. Then, the transmission operation of FIG. 6 is entered, and a predetermined time is waited. During this waiting time, the relay signal relayed by the relay device 1A is received. When the relay device 1B receives the relay signal from the relay device 1A as the lower layer, it is determined that there is a frame overlap in step S54 of FIG. 5, and the process returns to step S51. And when predetermined time passes, detection information, such as own hierarchy data 71 shown in Drawing 7, abnormal information 74, etc. is transmitted as a radio signal.
[0035]
Then, relay apparatus 1C performs the reception operation described in FIG. 5 and stores the reception information in the reception buffer. Then, the transmission operation of FIG. 6 is entered, and a predetermined time is waited. Since this waiting time is set longer than the relay apparatuses 1A and 1B, the relay signals of the relay apparatuses 1A and 1B are received during this time. That is, the reception of the relay signal from the relay device 1A is a signal from the lower layer relay device, and it is determined that there is a frame overlap in step S54 of FIG. 5, and the process returns to step S51. Further, when the relay device 1C receives the relay signal of the relay device 1B, the relay device 1C deletes the reception information stored in the reception buffer because it is reception from the peer layer and is a duplicate frame (step S56, 57), it returns to step S51. Therefore, although the relay apparatus 1C has entered the transmission operation, since the reception information is deleted from the reception buffer during waiting, the relay apparatus 1C returns to step S61 without transmitting (step S63). This eliminates redundant transmission of detection information that has already been relay-transmitted by the relay device 1B in the same hierarchy, eliminating the need for unnecessary transmission.
[0036]
Next, the relay signal transmitted by the relay device 1B is received not only by the relay device 1C but also by the upper layer relay devices 1D and 1E.
[0037]
The relay device 1D performs the same reception operation and relays and transmits after waiting for a predetermined time. On the other hand, since the relay device 1E receives the relay signal of the relay device 1D in the peer hierarchy during the waiting period, the same detection information is not relayed and transmitted. The relay signals of the relay apparatuses 1B and 1D are also received by the lower layer relay apparatuses 1A and 1C, but are not stored in the reception buffer as reception from the upper layer or peer layer relay apparatuses.
[0038]
And the controller 2 will receive the radio signal which relay apparatus 1D transmitted. Since the controller 2 receives the intrusion detection signal in the security set, the informing abnormality is notified from the reporting unit to the security center 5 via the telephone line 4. In the security center 5 that has received this report, appropriate measures are taken, such as sending the coping person to the security area A.
[0039]
In the present embodiment, the predetermined time measured by the time measuring means, that is, the transmission waiting time is described as being longer for the upper layer, but may be set shorter for the upper layer.
[0040]
【The invention's effect】
Since the relay device is provided with a hierarchy and only the lower layer signals are relayed and transmitted, it is not necessary to relay and transmit the radio signal relayed by the relay device of the peer layer or the upper layer.
[0041]
In addition, when the same detection information is received from the relay device of the same hierarchy or higher hierarchy, the relay device stops the transmission of the detection signal almost simultaneously, so that the relay device has the same detection information almost simultaneously. Even if it is received, it is not necessary to relay the same detection information.
[0042]
Therefore, there is an effect that communication traffic is reduced, the probability of occurrence of relay signal collision or the like is reduced, and signal transmission reliability is improved.
[0043]
[Brief description of the drawings]
FIG. 1 is a system configuration diagram. FIG. 2 is a block diagram of a sensor transmitter. FIG. 3 is a block diagram of a relay device. FIG. 4 is a block diagram of a controller. [Transmission operation of relay device 1] [FIG. 7] Contents of transmission data [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ......... Relay apparatus 11 ... Hierarchy setting part 12 ... Storage part 13 ... Transmitting part 14 ... Receiving part 15 ... Control part 16 ... Battery 2 ... Controller 3 ......... Sensor transmitter 4 ... ...... Communication line (telephone line)
5 ... Security Center

Claims (1)

A relay device used in a wireless system that transmits a wireless signal via a plurality of relay devices,
Receiving means for receiving a radio signal;
A determination means for comparing the hierarchical data included in the received information with its own hierarchical data and determining whether or not the wireless signal is from a lower-layer device;
A reception information storage unit that stores the reception information when the determination unit determines that the radio signal is from a lower-layer device;
Transmitting means for wirelessly transmitting the received information stored in the received information storage means by adding its own hierarchical data to all or part of the received information ;
When the determination means determines that the radio signal received by the reception means is a radio signal from a device of the same hierarchy or higher hierarchy, and the reception information of the same content has already been received, the reception information storage means Deleting means for deleting the received information,
The relay device, wherein the transmission means transmits the information after a predetermined time elapses for each relay device after being stored in the reception information storage means .

Images