JP2008236650A - Local disaster preventing radio system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital local disaster preventing radio system capable of performing an instruction communication such as a broadcast communication, a multi-cast communication, a control communication, etc. even when a function of a control board is lost. <P>SOLUTION: The local disaster preventing radio system of a method to be operated by at least two kinds of communication modes among a communication having no relation to control of the control board 10 and a communication to be performed under control of the control board 10 comprises a control station 1 to which the control board 10 is connected, base stations 2 to 4 linked to the control station 1, and a plurality of terminal stations 5<SB>1</SB>to 5<SB>n</SB>, 6<SB>1</SB>to 6<SB>n</SB>, 7<SB>1</SB>to 7<SB>n</SB>to be respectively linked to the base stations 2 to 4 by a digital radio line, wherein a control board monitor control unit 13 for monitoring an operation of the control board 10 in the control station and a radio control board 14 for enabling a communication with the base station 1 to be performed via the digital radio line is to be provided, then the radio control board 14 is characterized in being operated instead of the control board 10 by linking the radio control board 14 to the control station 1 via the base station 2 when abnormality is detected in the control of the control board 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a digital regional disaster prevention radio system, and in particular, a plurality of base stations under the control of a control station, each of these base stations having a plurality of terminal stations, and transmission between the base station and the terminal station The present invention relates to a regional disaster prevention radio system to which digital radio transmission is applied.

  In recent years, interest in regional disaster prevention has increased, and the importance of information transmission in regional units has been strongly screamed. In response to this, for example, the Radio Industry Association, as standard ARIB STB-T79, A standard titled "Digital Mobile Communication System" has been developed. In the system according to this formulation, a standard is created for a control base, a master station having a plurality of base stations, and a digital wireless system having a plurality of slave stations.

  Therefore, an example of the system standardized here will be described with reference to the prior art of FIG.

In FIG. 7, 1 is a control station, 2 to 4 are base stations, 5 _{1 to} 5 _n , 6 _{1 to} 6 _n , 7 _{1 to} 7 _n are terminal stations, 8a and 8b are multiple radio apparatuses, and 9a and 9b are end stations. A station apparatus, 10 is a control table, 11 is an operation management apparatus, and 12 is a communication recording apparatus. First, the control station 1 supervises the system and includes equipment necessary for circuit switching control in the system. Next, the base stations 2 to 4 are terminal stations (described later) arranged in each area. ) And the necessary equipment for performing digital wireless communication, and the terminal stations 5 _{1 to} 5 _n , 6 _{1 to} 6 _n , and 7 _{1 to} 7 _n are arranged in each area. It is equipped with facilities necessary to maintain communication. At this time, the multiplex radio apparatuses 8a and 8b serve to relay and connect the communication between the control station 1 and the base station 3 through the multiplex radio line, and the terminal station apparatuses 9a and 9b It works to relay between them with a wired line such as a dedicated line.

  On the other hand, the control stand 10 is connected to the control station 1 by wire and is disposed in the central department of the system such as the disaster countermeasure headquarters, and performs command communication such as general communication and control communication in addition to normal communication described later. It is used and has the necessary equipment. At this time, the operation management apparatus 11 functions to manage the operation state of the system, and the communication recording apparatus 12 functions to automatically record various communication states.

In the case of this digital regional disaster prevention radio system, the disaster prevention target area is divided into a plurality of areas serving as communication service units. And since the terminal stations 5 _{1 to} 5 _n , 6 _{1 to} 6 _n , and 7 _{1 to} 7 _n are respectively provided in each area, the number of terminal stations is the same as the number of areas. At this time, these terminal stations may be configured as mobile stations, for example.

  Next, the plurality of areas are grouped for each predetermined region to form a plurality of area groups, and base stations 2 to 4 are installed for each area group. Therefore, in the example of FIG. 7, the number of area groups is three. And the control station 1 used as the center of a system is installed corresponding to these multiple base stations 2-4.

Each of the terminal stations 5 _{1 to} 5 _n , 6 _{1 to} 6 _n , 7 _{1 to} 7 _n and the base stations 2 to 4 are connected to each other by a digital wireless line, which is why it is called digital. . Similarly, each of the base stations 2 to 4 is connected to the control station 1, but at this time, first, the base station 2 is connected to the control station 1 through a communication line, and then the base station 3 is It is connected to the control station 1 via a multiplex radio line by microwaves (for example, a microwave with a frequency of 2 GHz) multiplex radio devices 8a and 8b. The base station 4 is connected to the control station 1 via a wired line (such as a dedicated line) by the terminal station devices 9a and 9b. However, communication lines between the control station 1 and the multiplex radio apparatus 8a, between the multiplex radio apparatus 8b and the base station 3, between the control station 1 and the terminal apparatus 9a, and between the terminal apparatus 9b and the base station 4 are all communication lines. Connected by.

  Next, the operation of this prior art will be described. In this case, the communication operation is performed under the control of the control table 10 and the communication not involving the control table 10 (referred to as normal communication) as described below. Communication (called command communication).

Then, first, commonly communication between the terminal stations belonging to the same base station, for example, when communication is performed between the terminal station 5 ₁ and the terminal station 5 _n and (case 1), between the terminal stations belonging to different base stations , for example, when communication is performed between the terminal station 5 ₁ and the terminal station 6 _n (case 2), the case of performing different base stations between belongs terminal stations, for example, the communication between the terminal station 5 ₁ and the terminal station 7 _n ( case 3), between the terminal stations belonging to it to different base stations, and a case (case 4) performing, for example, communication between the terminal station ₆₁ and the terminal station 7 _n.

Here, first, in case 1, a line connection is made from one terminal station through the route of base station 2 → control station 1 → base station 2 → the other terminal station. Next, in case 2, terminal station 5 ₁ To base station 2 → control station 1 → base station 3 → terminal station 6 _n . Also, in case 3, and the line connection at the root of the base station 2 → control station 1 → base station 4 → terminal station 7 _n from the terminal station 5 _1, the case 4, the base station 3 → the control station from the terminal station ₆₁ 1 → Line connection is made by route of base station 4 → terminal station 7 _n . The same applies to other combinations.

On the other hand, when the control table 10 communicates with any one of the terminal stations, the line is connected to the terminal station via the base station to which the terminal station belongs. For example, when communicating with the terminal station 5 _1, control block 10 is the line connection to the terminal station 5 ₁ via the base station 2. Therefore, in this case, since the control table 10 is involved, it is out of the category of normal communication, but it is assumed to be normal communication for convenience.

Next, command communication, that is, communication performed under the control of the control table 10 includes simultaneous communication, broadcast communication, control communication, and the like. Here, if the connection between the control station 1 and the base station 2 is disconnected due to some kind of failure, only communication between the terminal stations 5 _{1 to} 5 _n arranged in the area group that the base station 2 is responsible for is performed. It automatically shifts to a return communication state that becomes possible, so-called base station return communication, which means that the connection between the control station 1 and the base station 3 or between the control station 1 and the base station 4 If the base station 3 is disconnected, the base station 3 is automatically switched to a loopback communication state in which only communication between the terminal stations 6 _{1 to} 6 _n is possible. In this case, the mobile station automatically shifts to a loopback communication state in which only communication between the terminal stations 6 _{1 to} 6 _n is possible.

In addition, as a prior art relevant to such a regional disaster prevention radio system, the indication of patent document 1 can be mentioned, for example.
JP 2006-261893 A

  The above prior art does not give consideration to the functional maintenance of the control stand, and has a problem in maintaining the function as a disaster prevention system in an emergency. In the prior art, since the control table and the control station are connected by wire, there is a risk that the connection will be lost in the event of a disaster, and in this case, the function of the control table is lost. On the other hand, command communication such as simultaneous communication, broadcast communication, and control communication is particularly effective in the event of a disaster. Therefore, the conventional technology has a problem in maintaining the function as a disaster prevention system in an emergency. It ends up.

  An object of the present invention is to provide a digital regional disaster prevention radio system capable of command communication such as simultaneous communication, broadcast communication, control communication even when the function of the control table is lost.

  The object is to provide a control station to which a control platform is connected, a plurality of base stations coupled to the control station, and a plurality of terminal stations coupled to each of the plurality of base stations by digital wireless lines, In the regional disaster prevention radio system that operates in at least two types of communication modes, communication that does not involve control by the base and communication that is performed under the control of the control base, the control station monitors the operation of the control base A control table monitoring control unit that performs communication with at least one base station of the plurality of base stations via the digital wireless line, and an abnormality is detected in the control of the control table In some cases, the wireless control table is coupled to the control station via the at least one base station, and the wireless control table operates in place of the control table.

  According to the present invention, since it is possible to communicate from the wireless control table to the terminal station, even if the control function of the original control table is lost, the wireless control table can be substituted for simultaneous communication, broadcast communication, control communication. Command communication such as can be performed, and it is possible to further ensure the maintenance of the function as a disaster prevention system.

  Here, FIG. 1 is a block diagram showing an embodiment of a digital regional disaster prevention radio system according to the present invention. Hereinafter, the present invention will be described in detail according to the embodiment shown here. In this case, First, 13 is a control table monitoring unit, and then 14 is a wireless control table, and the configuration other than these is the same as the system according to the prior art described with reference to FIG. First, the control table monitoring unit 13 is provided in the control station 1, monitors the operation status of the control table 10 on the control station 1, and detects when an abnormality occurs in the operation of the control table 10. do. Next, the radio control table 14 has a function as a control table and also has a transmission / reception function for communication via a digital radio line, and is one of a plurality of base stations 2 to 4 such as the base station 2 and information. It can be transmitted.

  Here, the details of the control station 1 and the base stations 2, 3, 4 will be described with reference to the block diagram of FIG. 2. First, the control station 1 includes a control table 10 as its equipment as shown in FIG. Further, a control unit 101 and a storage unit 102 are provided. At this time, the control unit 101 includes a CPU on which a predetermined program is mounted, and controls all operations necessary for the control station 1 together with the storage unit 102. At this time, the operation management device 11 and the communication storage device 12 may be connected via an interface (not shown), and these functions may be handled by the control unit 101.

  Next, each base station 2, 3, 4 is provided with a transmitting radio 110 and a receiving radio 111 as main equipment as shown in the figure. Is connected to the control station 1, and then the base station 3 is connected to the control station 1 via a multiple radio line by microwaves (for example, microwaves having a frequency of 2 GHz) multiplex radio devices 8a and 8b, and the base station 4 is connected to the control station 1 via a wired line (such as a dedicated line) by the terminal station devices 9a and 9b. Here, communication lines are used between the control station 1 and the multiplex radio apparatus 8a, between the multiplex radio apparatus 8b and the base station 3, between the control station 1 and the terminal apparatus 9a, and between the terminal apparatus 9b and the base station 4. As described above, the connection is established by.

Here, the details of each of the terminal stations 5 _{1 to} 5 _n , 6 _{1 to} 6 _n , and 7 _{1 to} 7 _n will be described with reference to the block diagram of FIG. 3. And a changeover switch 202, and as a receiving system, a receiving unit 203 to which a radio signal having a frequency f 1 sensed by the antenna 201 from any of the base stations 2 to 4 is input, and a receiving signal from the receiving unit 203 The reception signal processing unit 204 that receives the signal and processes it into an audio signal, and the speaker 205, and the transmission system, the transmission signal processing that inputs the audio signal supplied from the microphone (microphone) 210 and processes it as a transmission signal 211, and a transmission unit 212 that operates at the transmission frequency F1 using the transmission signal input from the transmission signal processing unit 211 as a modulation signal, and a control unit that controls them 206, a display unit 208, and an operation unit 209. At this time, the control unit 206 is provided with a storage unit 207.

  At this time, the operation unit 209 is provided with a press button 213, and when the press button 213 is pressed, the changeover switch 202 is switched, whereby the above-described reception system and transmission system are switched, so-called press-to-press.・ Communication operation can be obtained by the talk method. At this time, the frequency of the reception signal in the reception system is F1, and the frequency of the transmission signal by the transmission system is f1.

Next, the operation according to the embodiment of FIG. 1 will be described. First, also in this embodiment, the normal communication operation is the same as that of the prior art of FIG. Operates in communication mode. That is, as normal communication, communication between the terminal stations 5 _{1 to} 5 _n , 6 _{1 to} 6 _n , and 7 _{1 to} 7 _n, and the control table 10 and the terminal stations 5 _{1 to} 5 _n and 6 _{1 to} 6 _n , corresponding to communication between 7 _{1 to} 7 _n and operating corresponding to command communication such as simultaneous communication, broadcast communication and control communication.

  Therefore, in this embodiment, when the control station 1 is provided with the control table monitoring unit 13 and the communication operation described above is performed, the operation status of the control table 10 is monitored, and the operation of the control table 10 is performed. Unlike the case of the prior art in that an abnormality is detected, when the abnormality is further detected, the operation of the wireless control base 14 is started, and the system is controlled by the control base 10 instead. It is also different from the prior art in that the control by the radio control table 14 is replaced.

  Therefore, first, the monitoring of the operation status of the control table 10 by the control table monitoring unit 13 will be described in more detail. In this embodiment, the control table monitoring unit 13 performs a predetermined cycle, for example, at a predetermined interval of 3 seconds. A signal (inquiry signal) is transmitted to a signal line S (a signal line connecting the control station 1 and the control board 10). On the other hand, the control table 10 is configured to send back a predetermined signal (answer signal) to the signal line S when an inquiry signal is received via the signal line S. Further, after sending the inquiry signal to the signal line S, the control table monitoring unit 13 waits for the answer signal to be received through the signal line S each time until the next inquiry signal is sent. If no response signal is received, it is determined that an abnormality has been detected in the operation of the control table 10 and that the control caused by the abnormality has been lost.

  Here, despite the fact that the control table monitoring unit 13 has sent the inquiry signal, the answer signal has not been received means that the signal transmission cannot be performed due to the signal line S being disconnected or the like. This is a case where at least one of the functional failures occurs in the table 10, and in this case, an abnormality is detected in the control of the control table 10, and the control by this is no longer functioning. At this time, the control stand monitoring unit 13 repeats the inquiry several times and counts the number of times that the answer signal is not obtained, and the answer signal is not obtained continuously several times, for example, 10 times. It may be assumed that an abnormality has occurred for the first time.

  Next, the operation start-up operation of the wireless control table 14 by the abnormality detection of the control table monitoring unit 13 will be described. In the case of this embodiment, first, the control station 1 is configured to send a predetermined control signal to the base station 2 upon receiving an abnormality detection of the control table monitoring unit 13, and then the base station 2 When the control signal is input, a signal (operation start signal) instructing start-up of the operation is transmitted on the digital wireless line for the wireless control base 14 in response to the control signal. Further, the wireless control base 14 is configured to start up the operation when an operation start signal is received, and to send the reception signal to the base station 2.

  Although not described, for this reason, the radio control table 14 is configured to always maintain a standby state, and at this time, to maintain a state in which only a signal can be received through a digital radio line.

  When the base station 2 receives the reception signal from the radio control table 14, the base station 2 relays the base station 2 to couple the radio control table 14 and the control station 1 so that information can be transmitted to each other. The structure for this is further provided. Therefore, when the abnormality of the control table 10 is detected by the control table monitoring unit 13, the wireless control table 14 is automatically coupled to the control station 1 via the base station 2 as a result. The operation in place of 10 can be automatically performed. Therefore, at this time, that is, when it becomes impossible to control the system by the operation of the control table 10, it is possible to perform command communication as necessary by using the wireless control table 14 instead of the control table 10. become.

  Therefore, according to this embodiment, even when the signal line S is disconnected and the connection between the control station 1 and the control table 10 is lost, the system cannot be controlled by operating the control table 10. Since the wireless control table 14 is replaced with the control table 10, the original communication state can be maintained. Therefore, according to this embodiment, it is easy to maintain the function as a disaster prevention system in an emergency, and it is reliable. It can contribute to the construction of highly disaster prevention system.

  In addition, when the radio control table 14 is replaced with the control table 10, a notification that notifies the user may be made. For example, a display device such as a display lamp or a sound reproduction device may be provided on the wireless control table 14 so that it is activated when the operation is started.

  Next, another embodiment of the present invention will be described with reference to FIG. Here, the embodiment of FIG. 4 is provided with a portable control station 15 instead of the wireless control table 14 in the embodiment described with reference to FIG. According to this embodiment, the control station 1 is further provided with a wireless communication unit 16, and the other configurations are the control stand monitoring unit 13 ( The embodiment is the same as that of the embodiment of FIG. 1 (not shown). The wireless communication unit 16 is controlled by the control unit 101 (FIG. 2) of the control station 1.

  First, the portable control station 15 is a control station that can be transported according to its name. Although the scale is small, it has a function equivalent to that of the control station 1 for the time being. At this time, a portable wireless communication unit is provided separately, and is configured such that control signals can be exchanged between the portable wireless communication unit and the wireless communication unit 16. At this time, the wireless communication unit 16 functions to transmit a signal called a skyline signal on a radio wave having a predetermined frequency, for example, frequency f1, every predetermined period of time, for example, every second, while being portable. The portable radio communication unit of the control station 15 functions to transmit a signal called a transmission stop request signal on a radio wave having a predetermined frequency, for example, the frequency f2.

  Next, the operation according to the embodiment of FIG. 4 will be described with reference to the state transition diagrams of FIGS. FIG. 5 shows a state transition when shifting from the normal state managed by the control station 1 to the management by the portable control station 15 due to some abnormality, and FIG. This shows a state transition when shifting to management by the portable control station 15 in response to a request from the portable control station 15 in a normal state.

  First, the operation in the case of FIG. 5 will be described. In this case, an empty line signal is intermittently transmitted from the control station 1 until a certain time t1 after the system is started, and this is transmitted to the portable control station 15. It is received and the portable control station 15 is in a situation where it is monitored whether or not this empty line signal is received every predetermined period. Here, for some reason, for example, due to the occurrence of an abnormality, a certain skyline signal X is received, and until a certain time t1 after the lapse of a certain time of 1 second, the control station 1 performs the Suppose that the transmission of the line signal stops.

  Then, at this time, the portable control station 15 determines “no reception” at the time when, for example, a margin time of 0.5 seconds elapses after this time t1, and the management by the control station 1 here. Instead, the system shifts to system management by the portable control station 15. The state transitioned to system management by the portable control station 15 is represented by “notification start instruction” and subsequent “speech” in the state transition diagram of FIG.

  Therefore, when the system is shifted to the management of the system by the portable control station 15, by using the portable control station 15, command communication or the like can be performed at any place away from the control station 1 as necessary. Can be easily done. After that, although not shown, the monitoring of the sky signal by the portable control station 15 is continued as it is.

  By the way, after shifting to the management of the system by the portable control station 15 in this way, the function of the control station 1 is restored again for some reason, and when a certain time t2 is reached, transmission of an empty signal is performed. Is started. Then, this empty line signal is received by the portable control station 15, whereby the portable control station 15 stops functioning and returns to the state of only monitoring the empty signal. Therefore, as a result, the portable control station 15 is withdrawn from the management of the system, and thereafter returned to the normal state by the control station 1.

  Therefore, according to this embodiment, when an abnormality occurs in the function of the control station 1, instead of the management by the control station 1, the system automatically shifts to the system management by the portable control station 15. When the function 1 is restored, the system is automatically returned to the management by the control station 1 instead of the system management by the portable control station 15. As a result, it is easy to maintain the function as a disaster prevention system in an emergency. It can contribute to the construction of a highly reliable disaster prevention system.

  Next, the operation in the case of FIG. 6 will be described. In this case, in a state where an empty line signal is intermittently transmitted from the control station 1 and received by the portable control station 15, the portable control station 15 now controls the control station at a certain time t3. It is assumed that a function stop request is transmitted to 1. If it does so, the control station 1 will stop a function here, and transmission of an empty line signal will stop after this. Therefore, the portable control station 15 confirms that the reception of the sky signal is stopped, and then shifts to the management of the system by the portable control station 15 instead of the management by the control station 1. The state transitioned to the system management by the portable control station 15 is also expressed in the state transition diagram of FIG. 6 by “notification start instruction” and the subsequent “loud voice” as in the case of FIG. Yes.

  After shifting to system management by the portable control station 15 in this way, it is assumed that a function return request is transmitted from the portable control station 15 to the control station 1 at a certain time t4. Then, the control station 1 restores the function and shifts to the system management by the control station 1, and as a result, the empty signal is received by the portable control station 15 again. Therefore, the portable control station 15 stops its function when the empty signal is received.

  Therefore, according to this embodiment, it is possible to arbitrarily shift from management by the control station 1 to management of the system by the portable control station 15 by transmitting a function stop request from the portable control station 15 as necessary. If a function return request is transmitted as necessary, it is possible to arbitrarily return to system management by the control station 1, and it is possible to easily cope with maintenance of functions in an emergency.

It is explanatory drawing which shows one Embodiment of the regional disaster prevention radio | wireless system which concerns on this invention. It is a detailed block diagram of a control station and a base station in one embodiment of a regional disaster prevention radio system according to the present invention. It is a detailed block diagram of the terminal station in one Embodiment of the regional disaster prevention radio system which concerns on this invention. It is explanatory drawing which shows other one Embodiment of the regional disaster prevention radio system which concerns on this invention. It is a state transition diagram for demonstrating operation | movement of other one Embodiment of the regional disaster prevention radio system which concerns on this invention. It is a state transition diagram for demonstrating operation | movement of other one Embodiment of the regional disaster prevention radio system which concerns on this invention. It is explanatory drawing which shows an example of the local disaster prevention radio system by a prior art.

Explanation of symbols

1: Control station 2: Base station (base station for digital radio link)
3: Base station (base station for multiple radio links)
4: Base station (base station for wired line)
5 _{1 to} 5 _n : Terminal station (terminal station assigned to base station 2)
6 _{1 to} 6 _n : Terminal stations (terminal stations assigned to the base station 3)
7 _{1 to} 7 _n : Terminal stations (terminal stations assigned to the base station 4)
8a, 8b: Multiplex radio equipment (for multiple radio link)
10: Control stand (for wired line)
11: Operation management device 12: Communication recording device 13: Control table monitoring unit 14: Wireless control table 15: Portable control station 16: Wireless communication unit S: Signal line

Claims (1)

A control station to which a control table is connected; a plurality of base stations coupled to the control station; and a plurality of terminal stations coupled to each of the plurality of base stations via digital radio lines, In a regional disaster prevention radio system that operates in at least two types of communication modes, communication not involved and communication performed under the control of the control table,
A control table monitoring control unit for monitoring the operation of the control table at the control station;
Providing a radio control table capable of communicating with at least one of the plurality of base stations via the digital radio line;
When an abnormality is detected in the control of the control table, the wireless control table is coupled to the control station via the at least one base station, and the wireless control table operates instead of the control table. Regional disaster prevention radio system.

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