JP2014082730A - Wireless communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure the availability in the event that a communication failure occurs in a section between a control station and a base station, of the communication between a terminal station served by the affected base station and the control station, or the communication between a terminal station served by the affected base station and a terminal station served by another base station.SOLUTION: A wireless communication system comprises: a first terminal station; a first relay station; a first base station wirelessly connected with the first terminal station and the first relay station; a second terminal station; a second relay station; a second base station wirelessly connected with the second terminal station and the second relay station; and a communication control unit connected with the first base station and the second base station. The wireless communication system is configured such that, in the event of a communication failure in a section between the first base station and the communication control unit, the first relay station and the second relay station are wirelessly connected to allow the first terminal station and the second terminal station to wirelessly communicate with each other via the first relay station, the second relay station, and the second base station.

Description

  The present invention is a radio comprising a control station, a base station connected to the control station, a plurality of terminal stations wirelessly connected to the base station, and a relay station that relays wirelessly between the base station and the terminal station. The present invention relates to a communication system.

  In a conventional radio communication system, for example, a disaster prevention radio system, a control station and a plurality of base stations, for example, a first base station and a second base station are connected to each other by, for example, microwave lines or wires. Each of the stations is wirelessly connected to a relay station and a plurality of terminal stations. Communication is possible between the control station and the terminal station, and between the terminal station and the terminal station.

  In this wireless communication system, for example, when a failure occurs in the microwave line between the control station and the first base station, communication is performed between the terminal stations being served by the first base station via the first base station. However, communication between the control station and the terminal station under the first base station becomes impossible. Then, for example, when an emergency occurs, the emergency information cannot be transmitted from the terminal station affiliated with the first base station to the control station, and the emergency command is transmitted from the control station to the first base station affiliated company. It cannot be transmitted to the terminal station.

  In addition, communication between a terminal station affiliated with the first base station and a terminal station affiliated with the second base station becomes impossible. Then, for example, when an emergency situation occurs, emergency information cannot be transmitted from a terminal station affiliated with the first base station to a terminal station affiliated with the second base station, and vice versa.

  In the following Patent Document 1, in a wireless communication system in which a control station and a plurality of wireless base stations are connected by a wired line, when a failure occurs in the wired line, the object is a wireless base station in which a failure occurs in the wired line A technique is disclosed in which a wireless base station around a station performs wireless relay between a control station and a target station. However, in the system of Patent Document 1, it is necessary to install a large number of radio base stations so that the radio base stations can perform relaying.

JP 2012-4644 A

  The object of the present invention is to solve the above-mentioned problems of the prior art, and even when a communication failure occurs between the control station and the base station, the terminal station and the control station under the base station where the communication failure has occurred It is an object of the present invention to provide a wireless communication system that enables communication between a terminal station affiliated with a base station in which the communication failure occurs and a terminal station affiliated with another base station.

A typical configuration of the present invention for solving the above problems is as follows. That is,
A first terminal station, a first relay station, a first base station wirelessly connected to the first terminal station and the first relay station, a second terminal station, and a second relay A second base station wirelessly connected to the second terminal station and the second relay station, and a line control device connected to the first base station and the second base station. A wireless communication system comprising:
When a communication failure occurs between the first base station and the line control device, the first relay station and the second relay station are wirelessly connected, and the first relay station and the second relay station A wireless communication system, wherein the first terminal station and the second terminal station can communicate with each other via the relay station and the second base station.

  According to the present invention, when a communication failure occurs between the control station and the base station, communication between the terminal station being served by the base station and the control station where the communication failure has occurred, or the communication failure occurs. Communication between a terminal station affiliated with a base station and a terminal station affiliated with another base station can be made possible.

It is a block diagram of the radio | wireless communications system in 1st Embodiment of this invention. It is a block diagram of the control station in 1st Embodiment of this invention. It is a block diagram of the base station in 1st Embodiment of this invention. It is a block diagram of the relay station in 1st Embodiment of this invention. It is a block diagram of the terminal station in 1st Embodiment of this invention. It is a figure which shows a communication route when a communication failure generate | occur | produces between a control station and a base station in 1st Example of 1st Embodiment of this invention. It is a figure which shows the radio | wireless carrier frequency allocation used with the radio | wireless communications system in 1st Embodiment of this invention. It is a figure which shows the frame structure used with the radio | wireless communications system in 1st Embodiment of this invention. It is explanatory drawing in case the wireless control stand communicates simultaneously to a terminal station in 7th Example of 4th Embodiment of this invention. It is explanatory drawing in case the radio control stand performs simultaneous communication addressed to a terminal station in 8th Example of 4th Embodiment of this invention. It is explanatory drawing in case the wireless control stand communicates simultaneously with a terminal station in 9th Example of 4th Embodiment of this invention. It is explanatory drawing in the case of 10th Example of 4th Embodiment of this invention when a radio control stand communicates to a terminal station all at once.

(First embodiment)
1st Embodiment is a case where each base station connected to a control station comprises a different system, for example, a disaster prevention radio system of a different municipality. For example, the base station A and its affiliated terminal stations constitute an A city disaster prevention radio system, the base station B and its affiliated terminal stations constitute a city B disaster prevention radio system, and the A city disaster prevention radio system and B This is a case where the city disaster prevention radio system is incorporated into the prefecture disaster prevention radio system. In this case, the base station A and the base station B are connected to the control station of the prefecture disaster prevention radio system.

(Configuration of wireless communication system)
The configuration of the wireless communication system according to the first embodiment will be described with reference to FIG. FIG. 1 is a diagram illustrating a configuration of a wireless communication system according to an embodiment of the present invention. The radio communication system of FIG. 1 is defined by, for example, “Prefectural / Municipal Digital Mobile Communication System” or “Municipal Digital Mobile Communication System” of the standard ARIB STD-T79 (Association of Radio Industries and Businesses-T79). Is a digital wireless system. This digital wireless system is configured to perform a communication connection service for direct communication between terminal stations via base stations or between terminal stations not via base stations.

As shown in FIG. 1, the radio communication system of this embodiment mainly includes a control station 10, base stations 30A and 30B, and a multiple radio apparatus (ODU: Out) that connects the control station 10 and the base stations 30A and 30B. -Door Unit) 20T, 20A, 20B, relay stations 40A, 40B that normally function as semi-fixed stations, and mobile terminal stations 50 (1) -50 (5). The relay station 40A and the relay station 40B are installed adjacent to each other. In the example of FIG. 1, the base station 30A and the base station 30B are adjacent to each other, but may not be adjacent to each other.
As will be described later, the relay station 40 functions as a relay station when a communication failure occurs between the control station 10 and the base station 30. For example, when a communication failure occurs between the control station 10 and the base station 30B, the relay station 40A and the relay station 40B function as a relay station that connects the base station 30A and the terminal station 50 being served by the base station 30B. The terminal station 50 includes a mobile radio device, a portable radio device, an information terminal station, a semi-fixed station, or a fixed radio control table mounted on a vehicle or the like. Reference numerals 30AA and 30BA denote base station areas of the base stations 30A and 30B, that is, communication areas of the base station 30, respectively.

  In the example of FIG. 1, two base stations 30A and 30B are shown as the base station 30, but may be three or more. The number of multiplex radio apparatuses 20 varies according to the number of base stations 30. Also, although two relay stations 40 are shown, three or more relay stations 40 may be provided, and a plurality of relay stations 40 may be installed for one base station 30. Further, although five terminal stations 50 are shown, the number may be other than five as long as it is one or more. A base station is referred to as a base station 30. When a multiplex radio apparatus is represented, it is called a multiplex radio apparatus 20. When a relay station is represented, it is called a relay station 40. When representing the terminal station 50, the terminal station 50 is referred to as a terminal station 50.

  In the example of FIG. 1, the control station 10 and the base station 30 are connected by the multiplex radio apparatus 20 using the microwave line via the antenna 21T and the antennas 21A and 21B. Instead, the control station 10 and the base station 30 may be wired. The base station 40 and the terminal station 50 or the relay station 40 are connected so that wireless communication can be performed by, for example, 260 MHz digital radio.

  FIG. 7 shows an example of radio carrier frequency allocation permitted to be used in a digital radio system using the digital radio technology defined in the standard ARIB STD-T79. In FIG. 7, for example, in the uplink direction, that is, in the direction from the terminal station to the base station, a plurality of waves (f1, f2,...) Are recognized with a radio carrier f of about 260 MHz to 266 MHz and a width of 25 kHz. . In the downstream direction, that is, in the direction from the base station to the terminal station, a radio carrier F having a frequency of about 269 MHz to 275 MHz, 9 MHz away from 260 MHz in the upstream direction, and a plurality of waves (F1, F2,...) With a width of 25 kHz. It recognized. Therefore, in the communication of the digital wireless system, the frequencies in the upstream direction f1, f2,..., The downstream directions F1, F2,. Each system can use one or a plurality of radio carriers according to the scale. In the example of FIG. 1, the base station 30A uses f1 and F1, and the base station 30B uses f2 and F2.

  Further, in the standard ARIB STD-T79, a terminal station 50 (4) located between the terminal stations, for example, within the communication area 30BA, and a terminal station 50 (5) located outside the communication area 30BA are connected to the base station. The wireless carrier W is recognized as a direct communication wave so that direct communication between the terminal stations can be performed without going through 30. This wireless carrier W also has a bandwidth of 25 kHz, and a dozen waves (W1, W2,...) Are recognized. In the example of FIG. 1, W1 is used as a direct communication wave.

  Further, each wireless carrier, for example, F1 and f1, is divided into frames as shown in FIG. 8, and after the frame is further divided into four slots, the control channel C and communication channels S1, S2, S3 are placed in the slots. Is assigned. Note that the communication channels S1, S2, and S3 are referred to as communication channels (or communication channels) S. Here, for example, one frame is 40 ms, and one slot is 10 ms. The control channel C is a channel for performing connection control of a wireless line, and the communication channel S is a channel for performing a telephone call and data communication. FIG. 8 shows an example, and the number of uplink and downlink pair waves, the number of control channels, the number of communication channels, and the like can be appropriately changed according to the scale of the system and the purpose of use.

The control station will be described with reference to FIG.
FIG. 2 shows the configuration of the control station in this embodiment. The control station 10 is an interface (connection unit for connecting the control station control device 11, the storage unit 12, the control table 13, the operation management device 14, the control station control device 11, and the multiplex radio device 20T. IF) which is IF). The control station control device 11 includes a line control device 11a and a control station control unit 11b. In the case where the multiplex radio apparatus 20T is not used, the IF 15 serves as an interface for connecting the control station control apparatus 11 and the base station 30.

  The line control device 11a maintains and manages the communication connection and the service area between the base station 30 and the plurality of terminal stations 50 in this digital radio system, and performs call control or communication route from the control station 10 or the terminal station 50. Performs control for setting. Further, the line control device 11a manages the communication connection status between the control station 10 and the base station 30, and detects that a communication failure has occurred between the control station 10 and the base station 30B, for example. Notification from the control station 10 to the base station 30A to which the relay station 40A adjacent to the relay station 40B under 30B belongs, so that the relay station 40A stops the function as a semi-fixed station and starts the function as a relay station. Send information.

The control station control unit 11b controls each component constituting the control station 10 and the entire control station 10.
Note that the control station control device 11 may be configured integrally with one of the base stations 30 or may be installed in a place distant from each other as shown in FIG.

The storage unit 12 stores a base station ID (identifier) that identifies the base stations 30 with which the relay stations 40 are adjacent to each other in association with each other. This is information indicating which relay station 40 under which the base station 30 is to be placed in the direct relay mode described later when a communication failure between the control station 10 and the base station 30 occurs.
For example, when the relay station 40A under the base station 30A and the relay station 40B under the base station 30B are adjacent to each other, the base station IDs of the base station 30A and the base station 30B are stored in association with each other. Thereby, for example, when a communication failure occurs between the control station 10 and the base station 30B, the line control device 11a refers to the storage unit 12 so that the relay adjacent to the relay station 40B being served by the base station 30B. The broadcast information can be transmitted to the base station 30A to which the station 40A belongs so that the relay station 40A starts a function as a relay station.

  The control table 13 includes an operation display unit (not shown), a microphone, a speaker (not shown), etc., and has a control function capable of monitoring, interrupting, and forcibly disconnecting other calls. The operator operates the control table 13. Then, an operation such as communicating with each terminal station 50 or issuing an urgent instruction to each terminal station 50 is performed.

  The operation management device 14 includes an operation display unit (not shown), has a function of setting and maintaining basic management information of the digital wireless system such as system status confirmation, and is mainly an administrator of the digital wireless system. However, it is comprised so that it may operate using the said operation display part.

The base station will be described with reference to FIG.
FIG. 3 shows the configuration of the base station in this embodiment. The base station 30 is an interface (IF) IF35 that is a connection unit for connecting the control unit 31, the storage unit 32, the transmission unit 33, the reception unit 34, and the base station 30 to the multiplex radio apparatus 20A. Is provided. In the case where the multiplex radio apparatus 20A is not used, the IF 35 serves as an interface for connecting the base station 30 and the control station 10.

  The transmission unit 33 includes an antenna 33a, converts the baseband signal output from the control unit 31 into a radio frequency signal, and transmits the radio frequency signal to the terminal station 50 and the relay station 40 being served by the base station via the antenna 33a. Wireless transmission is performed using the wireless carrier F. The receiving unit 34 includes an antenna 34a, receives a radio frequency signal using the radio carrier f from the terminal station 50 and the relay station 40 being served by the base station via the antenna 34a, converts the radio frequency signal into a baseband signal, and controls the baseband signal. To the unit 31.

  The storage unit 32 stores a relay station ID for identifying the relay station 40 being affiliated with the base station. Moreover, the system code which is ID which identifies the disaster prevention radio system to which the said base station belongs, for example, a city disaster prevention radio system, is memorize | stored. These are input by an operator via an operation display unit (not shown) of the base station 30, for example. Further, the storage unit 32 stores information indicating whether or not a folding mode described later is entered.

  The control unit 31 controls each component constituting the base station 30 and the entire base station 30. When a communication failure occurs with the control station 10, the control unit 31 Control is performed so that loopback communication is performed between the relay stations 40. That is, control is performed so that information received by the wireless carrier f is transmitted by the wireless carrier F.

The relay station will be described with reference to FIG.
FIG. 4 shows the configuration of the relay station in this embodiment. The relay station 40 includes a control unit 41, a storage unit 42, a base station wave radio unit 43, and a direct wave radio unit 44.
The base station wave radio unit 43 includes an antenna 43a, converts the signal of the frequency W output from the direct wave radio unit 44 through the control unit 41 into the frequency f, and performs radio transmission through the antenna 43a. . The base station wave radio unit 43 receives a radio signal of frequency F via the antenna 43 a and outputs the radio signal to the direct wave radio unit 44 via the control unit 41.

The direct wave radio unit 44 includes an antenna 44a, converts the signal of the frequency F output from the base station wave radio unit 43 via the control unit 41 into the frequency W, and performs radio transmission via the antenna 44a. . The direct wave radio unit 44 receives a radio signal having a frequency W via the antenna 44 a and outputs the radio signal to the base station wave radio unit 43 via the control unit 41.
Note that the operation for converting the above-mentioned frequency W signal to the frequency f and the operation for converting the frequency F signal to the frequency W are performed by only one of the base station wave radio unit 43 and the direct wave radio unit 44. It is also possible to have a configuration that is performed, or a configuration that is performed by the control unit 41 is possible.

The storage unit 42 is adjacent to a relay partner when the relay station 40 exhibits a relay function, that is, when a communication failure occurs between the control station 10 and the base station 30 to which the relay station 40 belongs. The relay station ID of the relay station 40 is stored. Further, information indicating the direction of the adjacent relay station 40 serving as a relay partner is stored. Further, the system code described above is stored. These are input by an operator via an operation display unit (not shown) of the relay station 40, for example.
Further, the storage unit 42 stores information indicating whether or not a direct relay mode described later is entered.

The control unit 41 controls each constituent unit constituting the relay station 40 and the entire relay station 40.
In addition, the control unit 41 normally does not exhibit the relay function of the relay station 40 when there is no communication failure between the control station 10 and the base station 30 to which the relay station 40 belongs. The terminal station 50 is controlled so as to function as a semi-fixed station. In a normal case, whether or not the system code included in the information received from the other relay station 40 or the terminal station 50 is an appropriate code, for example, whether or not it matches the system code of the own system is stored. A check is made with reference to the system code of the own system stored in the unit 42. Received information other than the own system is ignored as invalid information.

  In addition, when a communication failure occurs between the control station 10 and the base station 30 to which the relay station 40 belongs, the control unit 41 transmits notification information from the control station 10 that the communication failure has occurred to the base station. The relay station 40 is controlled so as to function as a direct relay station that relays a direct wave between the adjacent relay station 40 and the terminal station 50 in the inter-terminal direct communication mode. The inter-terminal direct communication mode will be described later. When the relay station 40 functions directly as a relay station, the function as a semi-fixed station is stopped.

  In addition, when the control unit 41 functions as a direct relay station, whether or not the system code included in the information received from the other relay station 40 or the terminal station 50 is an appropriate code, for example, Do not check whether it matches the system code. Note that the control unit 41 may be configured to hold in advance the system code of another adjacent system and check whether it matches the system code included in the information received from another relay station 40, the terminal station 50, or the like. Good.

The terminal station will be described with reference to FIG.
FIG. 5 shows the configuration of the terminal station in this embodiment. The terminal station 50 includes a control unit 51, a storage unit 52, a transmission unit 53, a reception unit 54, a changeover switch 55 for switching between transmission and reception, an antenna 55a, an operation display unit 57, a microphone 58, and a speaker 59. Prepare.
Based on the operator's instruction received by the operation display unit 57, the terminal station 50 performs a base station communication mode in which communication is performed using the wireless carriers f and F via the base station 30 and a wireless carrier without using the base station 30. Any of the direct communication modes between terminals that perform direct communication between terminals using W can be selected.

  The storage unit 52 stores the above-described system code in advance. The storage unit 52 stores whether the communication mode at that time is the base station communication mode or the inter-terminal direct communication mode, and stores whether the communication mode is a return communication mode to be described later. .

  The control unit 51 controls the above-described components configuring the terminal station 50 and the terminal station 50 as a whole. For example, the control unit 51 converts the audio signal output from the microphone 58 into a baseband signal and outputs the baseband signal to the transmission unit 53. Then, the baseband signal output from the receiving unit 54 is converted into an audio signal and output to the speaker 59.

The transmission unit 53 converts the baseband signal output from the control unit 51 into a radio frequency signal, and performs wireless transmission via the antenna 55a. The receiving unit 54 receives a radio frequency signal via the antenna 55a, converts it to a baseband signal, and outputs the baseband signal to the control unit 51. The changeover switch 55 connects the transmission unit 53 or the reception unit 54 and the antenna 55a based on an instruction from the control unit 51.
When the above-described base station communication mode is selected, the transmission unit 53 wirelessly transmits a radio frequency signal using the radio carrier f to the base station 30, and the reception unit 54 receives the base station via the antenna 55a. A radio frequency signal using a radio carrier F is received from 30. When the inter-terminal direct communication mode is selected, the transmission unit 53 wirelessly transmits a radio frequency signal using the radio carrier W, and the reception unit 54 uses the radio carrier W via the antenna 55a. Receive.

The control station control device 11, the base station control unit 31, the relay station control unit 41, and the terminal station control unit 51 each have a hardware configuration such as a CPU (Central Processing Unit) and an operation program for the control device and the control unit. The CPU operates according to this operation program.
Further, the control station storage unit 12, the base station storage unit 32, the relay station storage unit 42, and the terminal station control unit 52 can be configured by a semiconductor memory, a hard disk device, or the like.

The operation when a communication failure occurs between the control station and the base station will be described with reference to FIG.
FIG. 6 is a diagram showing a communication route when a communication failure occurs between the control station and the base station in the present embodiment, and particularly shows a communication route in a first example described later. In the example of FIG. 6, a base station 30 </ b> A and a base station 30 </ b> B are connected to the control station 10 via the multiplex radio apparatus 20. The terminal station 50 (1) and the relay station 40A exist under the base station 30A, and the terminal station 50 (3) and the relay station 40B exist under the base station 30B. FIG. 6 is an example in which a communication failure has occurred between the multiplex radio apparatus 20T of the control station 10 and the multiplex radio apparatus 20B of the base station 30B. The relay station 40A and the relay station 40B are each a semi-fixed station and function as the terminal station 50 in a normal case where no communication failure occurs between the control station 10 and the base station 30B. The function of is not performed.

  The base station 30B recognizes that a communication failure has occurred between the base station 30B and the control station 10, for example, by not being able to receive signals periodically transmitted from the control station 10. Then, the base station 30B enters a loopback communication mode in which the radio signal having the frequency f2 received from the terminal station 50 and the relay station 40B being served by the base station 30B is converted into a radio signal having the frequency F2 and transmitted. At this time, the base station 30B receives the destination address (calling telephone number), the transmission source address (transmission source telephone number), the system code set for each local government, communication data, and the like as information received from the terminal station 50 as they are. Wrap. Therefore, communication is possible between the terminal stations 50 being served by the base station 30B via the base station 30B.

In addition, the base station 30B notifies the terminal station 50 and the relay station 40B being served by the notification information that the loop communication mode has been entered. When receiving the return communication mode, the relay station 40B stops the function as the semi-fixed station and starts the function as the relay station. That is, relay station 40B enters a direct relay mode in which direct wave communication using direct wave W1 is possible with relay station 40A adjacent to relay station 40B.
At this time, the relay station 40B directs its own direct wave antenna 44b toward the relay station 40A based on the information indicating the direction of the relay station 40A stored in the relay station storage unit 42 of the relay station 40B.

  Further, the control station 10 recognizes that a communication failure has occurred with the base station 30B, for example, by not being able to receive a response signal to a signal periodically transmitted to the base station 30B. Then, the control station 10 transmits broadcast information instructing that the relay station 40A enters the direct relay mode to the base station 30A to which the relay station 40A adjacent to the relay station 40B belongs. As described above, in the control station storage unit 12, when a certain base station 30 enters the loopback communication mode, information indicating which base station 30 is relayed to the direct relay mode is stored in the operator. Is set in advance.

The base station 30A that has received the broadcast information instructing that the relay station 40A enters the direct relay mode from the control station 10 transmits the broadcast information for setting the relay station 40A to the direct relay mode with the relay station 40B. . The relay station 40A that has received the broadcast information for setting the relay station 40A in the direct relay mode from the base station 30A stops functioning as a semi-fixed station, and does not directly receive a direct wave between the base station 30B and the relay station 40B being served by the base station 30B. The direct relay mode that enables direct wave communication using W1 is entered.
At this time, based on the information indicating the direction of the relay station 40B stored in the relay station storage unit 42 of the relay station 40A, the relay station 40A moves to the direction of the relay station 40B being served by the base station 30B. The antenna 44a is directed.

  The relay station 40A and the relay station 40B that have entered the direct relay mode relay the received information even if the system code included in the information received from the terminal station 50 or the control board 13 is different from the system code of the local government to which it belongs. To do. For example, even when the relay station 40A belonging to the local government A receives information including the system code of city B from the relay station 40B at the frequency W1, the relay station 40A relays this information and transmits it at the frequency f1.

(First embodiment)
In the first embodiment, the operation when the terminal station 50 (3) communicates to the control table 13 in the state where a communication failure has occurred between the control station 10 and the base station 30B is described in the first embodiment. Will be described.
First, the terminal station 50 (3) in the communication area 30BA transmits information on the frequency f2 to the control board 13 (step S1). This information includes, for example, a destination address that is a calling telephone number of the control table 13, a transmission source address that is a telephone number of the terminal station 50 (3), and a system code of the disaster prevention radio system in the B city.
As shown in FIG. 6, the information on the frequency f2 transmitted from the terminal station 50 (3) is converted into the frequency F2 by the base station 30B, is returned, and is received by the base station wave radio unit 43 of the relay station 40B. (Step S2). In the relay station 40B, the direct wave of the frequency W1 is converted and transmitted from the direct wave radio unit 44 to the relay station 40A (step S3).

  In the relay station 40A, the direct wave radio unit 44 receives the direct wave of the frequency W1 from the relay station 40B, converts it into a base station wave of the frequency f1, and transmits it from the base station wave radio unit 43 (step S4). ). The base station 30A transmits the information received from the relay station 40A to the control station 10 via the multiplex radio device 20A (step S5). At this time, the relay station 40A and the base station 30A handle the system code of city B as an appropriate code. In the control station 10, when the information received from the relay station 40A is a voice, the voice is output from the speaker of the control table 13, and in the case of non-voice data, for example, the information is displayed on the display unit of the control table 13 (step S6).

(Second embodiment)
In the first embodiment, the operation when the control table 13 communicates with the terminal station 50 (3) in the state where a communication failure has occurred between the control station 10 and the base station 30B is described in the second embodiment. Will be described.
First, the control table 13 transmits information to the terminal station 50 (3) in the communication area 30BA (step S11). This information includes, for example, the destination address that is the telephone number of the terminal station 50 (3), the source address that is the telephone number of the control table 13, and the system code of the disaster prevention radio system in the B city.
Information transmitted from the control table 13 to the terminal station 50 (3) is transmitted to the terminal station 50 (3) in the reverse procedure of the first embodiment. Specifically, the information transmitted from the control table 13 is transmitted to the base station 30A via the multiplex radio apparatus 20A (step S12). In the base station 30A, the information received from the control table 13 is transmitted at the frequency F1 (step S13). The relay station 40A converts the information on the frequency F1 received from the base station 30A into a direct wave of the frequency W1 and transmits it (step S14). At this time, the base station 30A and the relay station 40A handle the system code of city B as an appropriate code.

  The relay station 40B converts the frequency W1 information received from the relay station 40A into a base station wave of the frequency f2 and transmits it (step S15). The base station 30B converts the information on the frequency f2 received from the relay station 40B into a base station wave of the frequency F2, and transmits it back (step S16). The terminal station 50 (3) receives the information of the frequency F2 from the base station 30B. When the information received from the base station 30B is voice, the terminal station 50 (3) outputs voice from the speaker 59 of the terminal station 50 (3), and the non-voice Is displayed on the operation display unit 57 of the terminal station 50 (3), for example (step S17).

(Third embodiment)
In the first embodiment, the operation when the terminal station 50 (3) communicates to the terminal station 50 (1) in a state where a communication failure has occurred between the control station 10 and the base station 30B is described. This will be described as a third embodiment.
First, the terminal station 50 (3) existing in the communication area 30BA of the base station 30B transmits information on the frequency f2 to the terminal station 50 (1) existing in the communication area 30AA (step S31). This information includes, for example, a destination address that is a telephone number of the terminal station 50 (1), a source address that is a telephone number of the terminal station 50 (3), and a system code of the disaster prevention radio system in the B city. The information on the frequency f2 transmitted from the terminal station 50 (3) is converted to the frequency F2 by the base station 30B and transmitted back (step S32). Information on the frequency F2 transmitted from the base station 30B is received by the relay station 40B, converted into a direct wave of the frequency W1, and transmitted (step S33). The relay station 40A receives the information on the frequency W1 from the relay station 40B, converts it into a base station wave of the frequency f1, and transmits it (step S34). At this time, the base station 30A and the relay station 40A handle the system code of city B as an appropriate code.

The base station 30A transmits the information on the frequency f1 received from the relay station 40A to the control station 10 via the multiplex radio apparatus 20A (step S35). When the control station 10 recognizes that the destination is the terminal station 50 (1) in the line control apparatus 11a, the control station 10 transmits to the base station 30A via the multiplex radio apparatus 20A (step S36). The base station 30A transmits the information received from the control station 10 at the frequency F1 (step S37). The terminal station 50 (1) receives the information on the frequency F1 from the base station 30A. If the received information is voice, the terminal station 50 (1) outputs the voice from the speaker 59 of the terminal station 50 (1), In this case, for example, the information is displayed on the operation display unit 57 of the terminal station 50 (1) (step S38). At this time, the base station 30A and the terminal station 50 (1) handle the system code of B city as an appropriate code.
At this time, if another relay station 40A ′ exists under the base station 30A, the information transmitted from the base station 30A at the frequency F1 in step S37 described above is directly converted to the frequency W1 by the relay station 40A ′. It is also possible to be transmitted and received by the terminal station 50 (1).

(Fourth embodiment)
In the first embodiment, the operation when the terminal station 50 (1) communicates to the terminal station 50 (3) in a state where a communication failure has occurred between the control station 10 and the base station 30B is described. This will be described as a fourth embodiment.
Information transmitted from the terminal station 50 (1) in the communication area 30AA to the terminal station 50 (3) in the communication area 30BA is transmitted to the terminal station 50 (3) in the reverse procedure of the third embodiment. Specifically, first, information on the frequency f1 transmitted by the terminal station 50 (1) is received by the base station 30A (step S41). This information includes, for example, a destination address that is a telephone number of the terminal station 50 (3), a source address that is a telephone number of the terminal station 50 (1), and a system code of the disaster prevention radio system in the city A. Information received by the base station 30A is transmitted to the control station 10 via the multiplex radio apparatus 20A (step S42). When the line control device 11a of the control station 10 recognizes that the destination is the terminal station 50 (3), it is transmitted from the control station 10 to the base station 30A via the multiplex radio device 20A (step S43). The base station 30A transmits the information received from the control station 10 at the frequency F1 (step S44). The relay station 40A converts the information on the frequency F1 received from the base station 30A into a direct wave of the frequency W1 and transmits it (step S45).

  The relay station 40B converts the frequency W1 information received from the relay station 40A into a base station wave of the frequency f2 and transmits it (step S46). The base station 30B converts the information on the frequency f2 received from the relay station 40B into a base station wave of the frequency F2 and transmits it back (step S47). The terminal station 50 (3) receives the information of the frequency F2 transmitted from the base station 30B. When the received information is voice, the terminal station 50 (3) outputs the voice from the speaker 59 of the terminal station 50 (3), In the case of data, for example, it is displayed on the operation display section 57 of the terminal station 50 (3) (step S48). At this time, in the relay station 40B, the base station 30B, and the terminal station 50 (3), the system code of A city is handled as an appropriate code.

(5th Example)
In the first embodiment, when a communication failure occurs between the control station 10 and the base station 30B, the operation when the terminal station 50 (5) under the base station 30B communicates to the control table 13 is performed. This will be described as a fifth embodiment.
First, the terminal station 50 (5) under the base station 30B existing in the communication area 40AA of the relay station 40A transmits information on the frequency W1 to the control table 13 (step S51). This information includes, for example, a destination address that is a telephone number of the control table 13, a transmission source address that is a telephone number of the terminal station 50 (5), and a system code of the disaster prevention radio system in B city. Information on the frequency W1 transmitted from the terminal station 50 (5) is received by the relay station 40A (step S52). In the relay station 40A, the information on the frequency W1 received from the terminal station 50 (5) is converted into the frequency f1 and transmitted (step S53). The base station 30A transmits the information received from the relay station 40A to the control station 10 via the multiplex radio apparatus 20A (step S54). At this time, the base station 30A and the relay station 40A handle the system code of city B as an appropriate code. In the control station 10, when the information received from the relay station 40A is a voice, the voice is output from the speaker of the control table 13, and in the case of non-voice data, it is displayed on the display unit of the control table 13, for example (step S55).

In the first embodiment, the terminal station 50 (5) being served by the base station 30B is changed to the terminal station 50 (1) being served by the base station 30A in a state where a communication failure has occurred between the control station 10 and the base station 30B. The operation in the case of communicating with the address is the same. That is, when the line control device 11a of the control station 10 receives the information from the terminal station 50 (5) via the relay station 40A and the base station 30A, it decodes the destination and transmits the base station 30A via the multiplex radio device 20T. Send to. The information transmitted from the base station 30A at the frequency F1 is received by the terminal station 50 (1), and the sound is output from the speaker 59 of the terminal station 50 (1).
In the fifth embodiment, the terminal station 50 (5) may or may not be located in the communication area 30BA of the base station 30B.

(Sixth embodiment)
In the first embodiment, when the communication failure occurs between the control station 10 and the base station 30B, the operation when the control table 13 communicates with the terminal station 50 (5) under the base station 30B is performed. A sixth embodiment will be described.
Information transmitted from the control table 13 to the terminal station 50 (5) under the base station 30B in the communication area 40AA is transmitted to the terminal station 50 (5) in the reverse procedure of the fifth embodiment. Specifically, the information transmitted from the control table 13 is transmitted to the base station 30A via the multiplex radio apparatus 20A (step S61). This information includes, for example, the destination address that is the telephone number of the terminal station 50 (5), the source address that is the telephone number of the control board 13, and the system code of the disaster prevention radio system in the B city. In the base station 30A, the information received from the control table 13 is transmitted at the frequency F1 (step S62). The relay station 40A converts the information on the frequency F1 received from the base station 30A into a direct wave of the frequency W1 and transmits it (step S63). The terminal station 50 (5) receives information from the relay station 40A having the frequency W1, and when the received information is voice, the voice is output from the speaker 59 of the terminal station 50 (5). Is displayed on the operation display unit 57 of the terminal station 50 (5), for example (step S64). At this time, the base station 30A and the relay station 40A handle the system code of city B as an appropriate code.

In the first embodiment, the terminal station 50 (1) being served by the base station 30A and the terminal station 50 (5) being served by the base station 30B in a state where a communication failure has occurred between the control station 10 and the base station 30B. The operation in the case of communicating with the address is the same. That is, when the line control device 11a of the control station 10 receives information from the terminal station 50 (1) via the base station 30A, the line control device 11a decodes the destination and transmits it to the base station 30A via the multiplex radio device 20T. Information transmitted from the base station 30A at the frequency F1 is converted into a direct wave of the frequency W1 by the relay station 40A, transmitted, received by the terminal station 50 (5), and output from the speaker 59 of the terminal station 50 (5). Etc. are made.
In the sixth embodiment, the terminal station 50 (5) may or may not be located in the communication area 30BA of the base station 30B.

In the first embodiment described above, the relay station 40A and the relay station 40B normally function as the terminal station 50. When a communication failure occurs between the control station 10 and the base station 30, the direct wave relay station The case where it functions as was explained. However, it is also possible to employ a configuration in which the relay station 40A and the relay station 40B are not used during normal times.
In the first embodiment, the relay station 40A and the relay station 40B that are adjacent to each other are caused to function as a direct wave relay station. However, the relay station 40 that functions as a direct wave relay station is adjacent to the relay station 40A. It is also possible to adopt a configuration without this. For example, it is possible to cause the relay stations 40 under the base station 30 adjacent to each other to function as a direct wave relay station, or the relay stations 40 under the base station 30 that are not adjacent to each other as a direct wave relay station. It is also possible to function.

According to this embodiment, at least the following effects can be obtained.
(A1) When a communication failure occurs between the control station and the first base station, the first relay station being served by the first base station and the second base station adjacent to the first relay station Since a direct wave is connected to the second relay station being served by it, communication between the terminal station being served by the first base station where the communication failure has occurred and the control station can be enabled (first 1, see the second embodiment).
(A2) Similarly, it is possible to enable communication between a terminal station affiliated with the first base station and a terminal station affiliated with the second base station in which a communication failure has occurred (third and fourth embodiments). reference).
(A3) When a communication failure occurs between the control station and the first base station, the relay station under the second base station adjacent to the first base station functions as a direct wave relay station. It is possible to enable communication between a terminal station under the control of the first base station and the control station where a communication failure has occurred (see fifth and sixth embodiments).
(A4) Similarly, it is possible to enable communication between a terminal station affiliated with the first base station and a terminal station affiliated with the second base station in which a communication failure has occurred (fifth and sixth embodiments). reference).
(A5) When a communication failure occurs between the control station and the base station, the relay station functions as a direct wave relay station, and no communication failure occurs between the control station and the base station. Since it functions as a terminal station, the relay station equipment can be used effectively even when there is no communication failure between the control station and the base station.
(A6) When a communication failure occurs between the control station and the first base station, the first relay station being served by the first base station and the second base station adjacent to the first relay station Since the control station notifies the subordinate second relay station to connect the second relay station and the first relay station, the second relay station can function as a direct wave relay station. It can be easily realized.
(A7) Since the direction of the direct wave antenna of the relay station can be changed between a case where a communication failure occurs between the control station and the first base station and a case where no communication failure occurs, direct wave relay It can be easily realized to function as a station and function as a terminal station.
(A8) When a communication failure occurs between the control station and the first base station, it is treated as valid information even if the system code included in the received information is different from the code of its own system. A direct wave relay station can be realized.

(Second Embodiment)
In the first embodiment described above, the relay station 40A and the relay station 40B normally function as the terminal station 50, and when a communication failure occurs between the control station 10 and the base station 30, the direct wave relay station The case where it functions as was explained. However, as a second embodiment, normally, the relay station 40A functions as a base station wave relay station that relays between the base station 30A and the terminal station 50 being served by the base station 30A, and the relay station 40B is connected to the base station 30B. You may comprise so that it may function as a base station wave relay station which relays the terminal station 50 under the base station 30B.

  The configuration of the wireless communication system in the second embodiment is the same as the configuration of the wireless communication system in the first embodiment except for the relay station 40. The relay station 40 has the same configuration as that of the first embodiment shown in FIG. 4, but only the function at the normal time is different from that of the first embodiment. That is, the relay station 40 does not function as a semi-fixed station in a normal state, but converts the base station wave of the frequency F received from the base station 30 into a direct wave of the frequency W and transmits it. It functions as a base station wave relay station that converts a direct wave of frequency W received from another relay station 40 into a base station wave of frequency f and transmits it. This point is different from the first embodiment, and the other points are the same as in the first embodiment.

  When used as a normal base station wave relay station, the direct wave antennas 44a of the relay station 40A and the relay station 40B are directed, for example, to the dead zones of the communication area 30AA and the communication area 30BA, respectively. However, when a communication failure occurs between the control station 10 and the base station 30, it is directed to the relay station 40B and the relay station 40A, respectively, as in the first embodiment.

According to this embodiment, at least the following effects can be obtained.
(B1) When a communication failure occurs between the control station and the base station, the relay station functions as a direct wave relay station, and no communication failure occurs between the control station and the base station. Since it functions as a base station wave relay station, the relay station equipment can be used effectively even when there is no communication failure between the control station and the base station.

(Third embodiment)
The third embodiment is a case where a plurality of base stations connected to the control station constitute the same system, for example, a disaster prevention radio system in the same city. For example, the base station A and its affiliated terminal stations, and the base station B and its affiliated terminal stations constitute a disaster prevention radio system for city A. In this case, the control station may be a control station for the disaster prevention radio system in the prefecture or a control station for the disaster prevention radio system in City A.

The configuration and operation of the wireless communication system in the third embodiment are substantially the same as the configuration and operation of the wireless communication system in the first embodiment, but the base station 30A and its terminal stations 50, etc., the base station 30B, Since the terminal station 50 and the like belonging to the terminal belong to the same system, even if the terminal station 50 being served by the base station 30A and the terminal station 50 being served by the base station 30B communicate with each other, the received information is included in the received information. The system code differs from the first embodiment in that the system code is not an appropriate code.
In the third embodiment, similarly to the second embodiment, the relay station 40A and the relay station 40B can be configured to be used as base station wave relay stations during normal operation.
According to the present embodiment, at least the effects (A1) to (A7) shown in the first embodiment and the effect (B1) shown in the second embodiment can be obtained.

(Fourth embodiment)
The fourth embodiment is a case where a plurality of base stations connected to the control station constitute the same system, for example, a disaster prevention radio system in the same city, and further includes a radio control table. For example, the base station A and its affiliated terminal stations, and the base station B and its affiliated terminal stations constitute a disaster prevention radio system for city A, and a radio control stand is connected to the base station A. In this case, for example, the control stand in the control station is the control stand of the disaster prevention radio system in the prefecture, and the radio control stand is the control station of the disaster prevention radio system in City A. The wireless control stand has a control function that allows forcible disconnection of other calls in the wireless system of City A, and is used to give an urgent instruction to each terminal station 50 by, for example, simultaneous communication. The control station in the control station has a control function capable of forcibly disconnecting other calls in all radio systems under the control station including the disaster prevention radio system of A city. It is for giving instructions.

  The configuration and operation of the control station 10, the multiplex radio unit (ODU) 20, the base station 30, and the terminal station 50 in the fourth embodiment are the same as those in the third embodiment, but the configuration and operation of the relay station 40 are There are cases where it differs from the third embodiment (an eighth example described later).

FIG. 9 is a configuration example of a radio communication system according to the fourth embodiment of the present invention, and is an explanatory diagram when the radio control table 60 performs simultaneous communication to all terminal stations 50 in a seventh example to be described later. As shown in FIG. 9, in the fourth embodiment, the base station 30A and its affiliated terminal stations, and the base station 30B and its affiliated terminal stations constitute a disaster prevention radio system for the city A, and the base station A is wireless. A control table 60 is connected. The base station 30 </ b> A and the base station 30 </ b> B are connected to the control station 10 via a multiplex radio apparatus (ODU) 20, respectively. In addition to the disaster prevention radio system of City A, other disaster prevention radio systems, for example, the base station 30C (not shown) of the disaster prevention radio system of City C can be connected to the control station 10.
The radio control stand 60 is a control stand for the disaster prevention radio system in the city A, and the control stand 13 of the control station 10 is a control stand for all radio systems under the control station 10, for example, a control stand for the disaster prevention radio system in the prefecture. is there.

  The radio control table 60 can perform normal communication including one-to-one individual communication and one-to-n group communication with the terminal station 50 in the disaster prevention radio system of City A. In the individual communication, the wireless control table 60 performs duplex communication (transmission / reception) with one terminal station 50. In the group communication, the wireless control table 60 performs simplex communication (one-way communication) with respect to a group including a plurality of (n) terminal stations 50, that is, performs only transmission. In the case of normal communication, it cannot be interrupted during communication of another terminal station 50 as in the case of simultaneous communication described later.

  Moreover, the wireless control stand 60 can interrupt during communication of the other terminal station 50 in the disaster prevention wireless system of A city, forcibly disconnect the communication of the other terminal station 50, and can perform simultaneous communication. The simultaneous communication is a simplex communication (one piece communication) to a group composed of a plurality of (n) terminal stations 50 in the disaster prevention radio system of A city or to all the terminal stations 50 in the disaster prevention radio system of A city. Direction communication), that is, only transmission.

  As described above, the wireless control base 60 is a kind of the terminal station 50, and has the same configuration as the terminal station 50 shown in FIG. That is, the radio control table 60 corresponds to the control unit 51, the storage unit 52, the transmission unit 53, the reception unit 54, the changeover switch 55, the antenna 55a, the operation display unit 57, the microphone 58, and the speaker 59 in FIG. Unit 61, storage unit 62, transmission unit 63, reception unit 64, changeover switch 65, antenna 65a, operation display unit 67, microphone 68, and speaker 69.

  The storage unit 62 stores in advance a system code indicating that it is a disaster prevention radio system for city A. Further, in the storage unit 62, whether or not the communication mode of the base station 30A at that time is the loopback communication mode, that is, communication between the base station 30A to which the wireless control table 60 is connected and the control station 10 is performed. Whether or not a failure has occurred is stored.

  The control unit 61 controls the above-described components constituting the radio control table 60 and the radio control table 60 as a whole. For example, the control unit 61 converts an audio signal output from the microphone 68 into a baseband signal and transmits the base unit signal. The baseband signal output from the receiving unit 64 is converted into an audio signal and output to the speaker 69.

The transmission unit 63 converts the baseband signal output from the control unit 61 into a radio frequency signal, and performs radio transmission using the radio carrier f via the antenna 65a. The transmitter 63 can also wirelessly transmit a radio frequency signal using the wireless carrier W via the antenna 65a in parallel with the wireless transmission using the wireless carrier f (in the seventh embodiment described later). If).
The receiving unit 64 receives a radio frequency signal using the radio carrier F via the antenna 65a, converts it to a baseband signal, and outputs the baseband signal to the control unit 61. The changeover switch 65 connects the transmission unit 63 or the reception unit 64 and the antenna 65a based on an instruction from the control unit 61.

As a hardware configuration, the wireless control base control unit 61 includes a CPU (Central Processing Unit) and a memory that stores an operation program of the control unit 61, and the CPU operates according to the operation program.
Further, the radio control table control unit 62 can be configured by a semiconductor memory, a hard disk device, or the like.

(Seventh embodiment)
In the fourth embodiment, in a state where a communication failure has occurred between the control station 10 and the base station 30A, the wireless control table 60 performs simultaneous communication to all the terminal stations 50 in the disaster prevention wireless system of A city. An example of the operation will be described as a seventh embodiment with reference to FIG. FIG. 9 is an explanatory diagram when the radio control table 60 performs simultaneous communication to all the terminal stations 50 in the seventh embodiment, and a communication failure occurs between the multiplex radio apparatus (ODU) 20A and the base station 30A. doing.

First, the wireless control base 60 in the communication area 30AA transmits information on simultaneous communication of the frequencies f1 and W1 in parallel (step S71). This information includes, for example, a destination address that is a calling telephone number in the case of simultaneous communication, a transmission source address that is a telephone number of the radio control base 60, and a system code of a disaster prevention radio system in A city.
As shown in FIG. 9, the information on the frequency f1 transmitted from the wireless control base 60 is converted into the frequency F1 by the base station 30A and turned back, and all the terminal stations 50 in the communication area 30AA such as the terminal station 50 (1). (Step S72). The information on the frequency W1 transmitted by the wireless control base 60 is received by the relay station 40B, converted into a base station wave of the frequency f2 by the relay station 40B, and transmitted (step S73).

The transmission unit 63 of the radio control table 60 of the seventh embodiment includes a transmission unit 63a that transmits a base station wave of the frequency f1, and a transmission unit 63b that transmits a direct wave of the frequency W1. Further, the antenna 65a of the radio control table 60 of the seventh embodiment transmits an antenna 65aa that transmits a base station wave of the frequency f1 output from the transmission unit 63a and a direct wave of the frequency W1 that is output from the transmission unit 63b. Antenna 65ab. The antenna 65aa is installed toward the base station 30A, and the antenna 65ab is installed toward the relay station 40B.
Further, the direct wave antenna 44a of the relay station 40B of the seventh embodiment is installed toward the radio control base 60, and the base station antenna 43a is installed toward the base station 30B. .

  In the base station 30B, the information received from the relay station 40B is transmitted to the control station 10 through the multiplex radio apparatus 20B (step S74). When the control station 10 recognizes the simultaneous communication to all the terminal stations 50 in the disaster prevention radio system of the A city based on the destination address in the line control device 11a, the disaster prevention of the A city via the multiplex radio apparatus 20T. It transmits to all the base stations 30 in the wireless system, for example, the base station 30B (step S75). The base station 30B transmits the information received from the control station 10 at the frequency F2 (step S76). All the terminal stations 50 under the base station 30B, for example, the terminal station 50 (3), receive the information on the frequency F2 from the base station 30B, and if the received information is voice, the terminal station 50 (3) Audio is output from the speaker 59, and in the case of non-audio data, for example, it is displayed on the operation display unit 57 of the terminal station 50 (3) (step S77).

  As described above, in the seventh embodiment, the relay station 40A may not be connected to the base station 30A to which the radio control table 60 is connected. The relay station 40B is connected to the base station 30B in the vicinity of the base station 30A, for example, the base station 30B adjacent to the base station 30A, and the radio control table 60 transmits the base station wave f to the base station 30A. The direct wave W is transmitted to the relay station 40B.

  Thus, in the seventh embodiment, even when the relay station 40A is not connected to the base station 30A to which the radio control table 60 is connected, the radio control table 60 is connected to the base station wave f and the direct wave W. Are transmitted in parallel, so that when a communication failure occurs between the base station 30A and the line control device 11a of the control station 10, all the communication systems of the communication system are connected from the wireless control table 60. Simultaneous communication can be performed with the terminal station 50.

(Eighth embodiment)
In the fourth embodiment, in a state where a communication failure has occurred between the control station 10 and the base station 30A, the wireless control table 60 performs simultaneous communication to all the terminal stations 50 in the disaster prevention wireless system of A city. Another example of the operation will be described as an eighth embodiment with reference to FIG. FIG. 10 is an explanatory diagram when the radio control table 60 performs simultaneous communication to all the terminal stations 50 in the eighth embodiment.

First, the wireless control base 60 in the communication area 30AA transmits information on simultaneous communication with the frequency f1 (step S81). This information includes, for example, a destination address that is a calling telephone number in the case of simultaneous communication, a transmission source address that is a telephone number of the radio control base 60, and a system code of a disaster prevention radio system in A city.
As shown in FIG. 10, the information on the frequency f1 transmitted from the radio control base 60 is converted into the frequency F1 by the base station 30A and is returned, and all the terminal stations 50 in the communication area 30AA such as the terminal station 50 (1). (Step S82). The information on the frequency F1 returned by the base station 30A is received by the relay station 40A, converted into a base station wave of the frequency f2 by the relay station 40A, and transmitted (step S83).

  The base station wave radio unit 43 of the relay station 40A of the eighth embodiment is configured to be able to receive a base station wave of the frequency F1 from the base station 30A, and further, in the vicinity of the base station 30A, for example, an adjacent base station The base station wave having the frequency f2 used in the station 30B is configured to be transmitted. In addition, the base station wave antenna 43a of the relay station 40A of the eighth embodiment includes an antenna 43aa that transmits a base station wave of the frequency F1 and an antenna 43ab that transmits a direct wave of the frequency f2. The antenna 43aa is installed in the direction of the base station 30A, and the antenna 43ab is installed in the direction of the base station 30B.

The base station 30B transmits the information received from the relay station 40A to the control station 10 via the multiplex radio apparatus 20B (step S84). When the control station 10 recognizes that it is a simultaneous communication to all the terminal stations 50 in the disaster prevention radio system in the city A based on the destination address in the line control device 11a, the information received from the base station 30B is transmitted to the multiplex radio. It transmits to all the base stations 30 in the disaster prevention radio system of A city, for example, base station 30B, via the apparatus 20T (step S85).
The base station 30B that has received the information from the control station 10 transmits the information received from the control station 10 at the frequency F2 (step S86). All the terminal stations 50 under the base station 30B, for example, the terminal station 50 (3), receive the information on the frequency F2 from the base station 30B, and if the received information is voice, the terminal station 50 (3) Audio is output from the speaker 59, and in the case of non-audio data, for example, it is displayed on the operation display unit 57 of the terminal station 50 (3) (step S87).

  As described above, in the eighth embodiment, the relay station 40B may not be connected to the base station 30B in the vicinity of the base station 30A, for example, the base station 30B adjacent to the base station 30A. Then, the relay station 40A is connected to the base station 30A to which the radio control table 60 is connected, and the relay station 40A transmits the base station wave F1 received from the base station 30A to the base station wave f2 for transmission to the base station 30B. It is configured so that it can be converted and sent.

  Thus, in the eighth embodiment, even if the relay station 40B is not connected to the base station 30B, the base station wave received by the relay station 40A from the base station 30A to which the relay station 40A is connected. Since F1 is converted into a base station wave f2 for transmission to the base station 30B and transmitted, the wireless control is performed when a communication failure occurs between the base station 30A and the control station 10. Simultaneous communication can be performed from the platform 60 to all the terminal stations 50 of the communication system.

(Ninth embodiment)
In the fourth embodiment, in a state where a communication failure has occurred between the control station 10 and the base station 30A, the wireless control table 60 performs simultaneous communication to all the terminal stations 50 in the disaster prevention wireless system of A city. Another example of the operation will be described as a ninth embodiment with reference to FIG. FIG. 11 is an explanatory diagram when the radio control table 60 performs simultaneous communication to all the terminal stations 50 in the ninth embodiment.

First, the wireless control base 60 in the communication area 30AA transmits information on simultaneous communication with the frequency f1 (step S91). This information includes, for example, a destination address that is a calling telephone number in the case of simultaneous communication, a transmission source address that is a telephone number of the radio control base 60, and a system code of the disaster prevention radio system of City A.
As shown in FIG. 11, the information on the frequency f1 transmitted from the radio control base 60 is converted into the frequency F1 by the base station 30A and is returned, and all the terminal stations 50 in the communication area 30AA such as the terminal station 50 (1). (Step S92). The information on the frequency F1 returned by the base station 30A is received by the relay station 40A, converted into a direct wave of the frequency W1 by the relay station 40A, and transmitted (step S93).

The relay station 40B converts the direct wave having the frequency W1 received from the relay station 40A into a base station wave having the frequency f2, and transmits the base wave (step S94).
The base station 30B transmits the information received from the relay station 40B to the control station 10 via the multiplex radio apparatus 20B (step S95). When the control station 10 recognizes that it is a simultaneous communication to all the terminal stations 50 in the disaster prevention radio system in the city A based on the destination address in the line control device 11a, the information received from the base station 30B is transmitted to the multiplex radio. It transmits to all the base stations 30 in the disaster prevention radio system of A city, for example, base station 30B, via the apparatus 20T (step S96).
The base station 30B that has received the information from the control station 10 transmits the information received from the control station 10 at the frequency F2 (step S97). All the terminal stations 50 under the base station 30B, for example, the terminal station 50 (3), receive the information on the frequency F2 from the base station 30B, and if the received information is voice, the terminal station 50 (3) Audio is output from the speaker 59, and in the case of non-audio data, for example, it is displayed on the operation display unit 57 of the terminal station 50 (3) (step S98).

Thus, in the ninth embodiment, the relay station 40A is connected to the base station 30A to which the radio control table 60 is connected, and the base station 30B in the vicinity of the base station 30A, for example, the base station 30B adjacent to the base station 30A. Also, the relay station 40 is connected.
Therefore, in the ninth example, the relay station 40A and the relay station 40B perform communication between the base station 30A and the line control device 11a of the control station 10 by performing the operations described in the first to third embodiments. When a failure occurs, simultaneous communication can be performed from the wireless control console 60 to all the terminal stations 50 of the communication system.

(Tenth embodiment)
In the fourth embodiment, in a state where a communication failure has occurred between the control station 10 and the base station 30B, the wireless control table 60 connected to the base station 30A is connected to all the disaster prevention wireless systems in the A city. Another operation example in the case of simultaneous communication to the terminal station 50 will be described as a tenth embodiment with reference to FIG. FIG. 12 is an explanatory diagram when the wireless control base 60 performs simultaneous communication to all the terminal stations 50 in the tenth embodiment.

First, the wireless control base 60 in the communication area 30AA transmits information on simultaneous communication with the frequency f1 (step S101). This information includes, for example, a destination address that is a calling telephone number in the case of simultaneous communication, a transmission source address that is a telephone number of the radio control base 60, and a system code of the disaster prevention radio system of City A.
As shown in FIG. 12, the information on the frequency f1 transmitted from the wireless control base 60 is received by the base station 30A. The base station 30A transmits the information received from the radio control table 60 to the control station 10 via the multiplex radio apparatus 20A (step S95). When the control station 10 recognizes that it is a simultaneous communication to all the terminal stations 50 in the disaster prevention radio system of A city based on the destination address in the line control device 11a, the information received from the base station 30A is transmitted to the multiplex radio. It transmits to all the base stations 30 in the disaster prevention radio system of A city, for example, base station 30A, via the apparatus 20T (step S96).

  The base station 30A that has received the information from the control station 10 transmits the information received from the control station 10 at the frequency F1 (step S97). All the terminal stations 50 under the base station 30A, for example, the terminal station 50 (1), receive the information on the frequency F1 from the base station 30A. If the received information is voice, the terminal station 50 (1) Audio is output from the speaker 59, and in the case of non-audio data, for example, it is displayed on the operation display unit 57 of the terminal station 50 (1) (step S98).

Further, the relay station 40A receives the information on the frequency F1 from the base station 30A, converts it into a direct wave of the frequency W1, and transmits it (step S93). The direct wave with the frequency W1 transmitted from the relay station 40A is received by the relay station 40B, converted into a base station wave with the frequency f2, and transmitted.
The information on the frequency f2 transmitted from the relay station 40B is received by the base station 30B, converted to the frequency F2, returned, and received by all the terminal stations 50 in the communication area 30BA such as the terminal station 50 (3). (Step S92). The terminal station 50 (3) receives the information on the frequency F2 from the base station 30B. If the received information is voice, the terminal station 50 (3) outputs the voice from the speaker 59 of the terminal station 50 (3), and the non-voice data In this case, for example, it is displayed on the operation display unit 57 of the terminal station 50 (3) (step S98).

Thus, in the tenth embodiment, the relay station 40A is connected to the base station 30A to which the radio control table 60 is connected, and the base station 30B in the vicinity of the base station 30A, for example, the base station 30B adjacent to the base station 30A. Also, the relay station 40 is connected.
Accordingly, in the tenth example, the relay station 40A and the relay station 40B perform the operations described in the first to third embodiments, thereby communicating between the base station 30B and the line control device 11a of the control station 10. When a failure occurs, simultaneous communication can be performed from the radio control table 60 connected to the base station 30A to all the terminal stations 50 of the communication system.

  In the above embodiment, the line control device 11a determines that the communication is simultaneous communication based on the destination address (call telephone number in the case of simultaneous communication). However, the communication type included in the control channel information shown in FIG. You may comprise so that it may determine that it is simultaneous communication by information.

  In the above-described embodiment, the case where the radio control table 60 performs simultaneous communication with all the terminal stations 50 in the disaster prevention radio system in the city A has been described. Communication can also be performed. In this case, the radio control table 60 uses, for example, a call telephone number indicating a specific group as a destination address. The terminal station 50 that has received the simultaneous communication determines whether or not the local station is a target station for the simultaneous communication based on the received destination address of the simultaneous communication, and outputs a sound from the speaker 59 when the target station is the target station. Perform the operation.

According to this embodiment, at least the following effects can be obtained.
(D1) If the relay station 40 is connected to at least one of the base station 30A to which the radio control table 60 is connected or the base station 30B adjacent to the base station 30A, the base station 30A and the control station 10 When a communication failure occurs in the meantime, it is possible to perform simultaneous communication from the wireless control base 60 to all the terminal stations 50 of the communication system.
(D2) Even when the relay station 40A is not connected to the base station 30A to which the radio control table 60 is connected, the radio control table 60 can transmit the base station wave f and the direct wave W in parallel. Therefore, when a communication failure occurs between the base station 30A and the control station 10, the wireless control table 60 performs simultaneous communication with all the terminal stations 50 of the communication system. be able to.
(D3) Even if the relay station 40B is not connected to the base station 30B adjacent to the base station 30A to which the radio control table 60 is connected, the base station wave received from the base station 30A by the relay station 40A Since the F1 is converted into the base station wave f2 of the base station 30B and transmitted, the radio control table 60 starts when a communication failure occurs between the base station 30A and the control station 10. Simultaneous communication can be performed for all the terminal stations 50 of the communication system.

In addition, this invention is not limited to embodiment mentioned above, It can implement in various deformation | transformation and a combination. Moreover, it can implement by combining each Example mentioned above suitably.
In the first and fourth embodiments described above, the case where the radio control table 60 and the relay station 40 have directional antennas has been described. However, the radio control table 60 and the relay station 40 have omnidirectional antennas. It can also be configured. In this case, it is not necessary to set or change the direction of the antenna of the radio control table 60 or the relay station 40.

In addition, the present invention is understood not only as a system for executing processing according to the present invention, but also as an apparatus and method, a program for realizing such a method and system, and a recording medium for recording the program. can do.
In addition, the present invention may be configured such that the CPU performs control by executing a control program stored in the memory, or may be configured as a hardware circuit that does not use the CPU.

The present specification includes at least the following configurations. That is,
The first configuration is
A first terminal station, a first relay station, a first base station wirelessly connected to the first terminal station and the first relay station, a second terminal station, and a second relay A second base station wirelessly connected to the second terminal station and the second relay station, and a line control device connected to the first base station and the second base station. A wireless communication system comprising:
When a communication failure occurs between the first base station and the line control device, the first relay station and the second relay station are wirelessly connected, and the first relay station and the second relay station A wireless communication system, wherein the first terminal station and the second terminal station can communicate with each other via the relay station and the second base station.

The second configuration is the wireless communication system of the first configuration,
A control stand connected to the line control device,
When a communication failure occurs between the first base station and the line control device, the first relay station and the second relay station are wirelessly connected, and the first relay station and the second relay station A wireless communication system, wherein the first terminal station and the control table can wirelessly communicate with each other via the relay station and the second base station.

A third configuration is the wireless communication system of the first configuration or the second configuration,
When a communication failure occurs between the first base station and the line control device, the first terminal station and the second relay station are wirelessly connected, and the second relay station and the second relay station A wireless communication system, wherein the first terminal station and the second terminal station can wirelessly communicate with each other via a base station.

The fourth configuration is the wireless communication system of the second configuration,
When a communication failure occurs between the first base station and the line control device, the first terminal station and the second relay station are wirelessly connected, and the second relay station and the second relay station A wireless communication system, wherein the first terminal station and the control table can wirelessly communicate with each other via a base station.

A fifth configuration is the wireless communication system of the first configuration to the fourth configuration,
In a state where no communication failure occurs between the first base station and the line control device, the first relay station and the second relay station function as terminal stations, and In a state where a communication failure has occurred between the base station and the line control device, the first relay station and the second relay station are wirelessly connected, and the first relay station and the second relay station The wireless communication system, wherein the relay station stops functioning as a terminal station.

A sixth configuration is the wireless communication system of the first configuration to the fifth configuration,
When a communication failure occurs between the first base station and the line control device, the line control device causes the second base station to connect the second relay station to the first relay station. A radio communication system characterized in that the second relay station is informed via

A seventh configuration is the wireless communication system of the first configuration to the sixth configuration,
When a communication failure occurs between the first base station and the line control device, the first relay station changes the direction of the antenna for wireless connection with the second relay station to the second relay station. A wireless communication system, wherein the second relay station changes a direction of an antenna for wireless connection with the first relay station to a direction of the first relay station. .

An eighth configuration is the wireless communication system of the first configuration to the seventh configuration,
In a state where no communication failure has occurred between the first base station and the line control device, the first relay station and the second relay station have their system codes included in the received information. If it does not match the system code of the system, the received information is treated as invalid information, and is included in the received information when a communication failure has occurred between the first base station and the line controller. A radio communication system characterized in that the received information is treated as valid information even when the system code does not match the system code of the own system.

The ninth configuration is
A first terminal station, a first relay station, a first base station wirelessly connected to the first terminal station and the first relay station, a second terminal station, and a second relay A second base station wirelessly connected to the second terminal station and the second relay station, and a line control device connected to the first base station and the second base station. A wireless communication system comprising:
When a communication failure occurs between the first base station and the line control device, the first relay station and the second relay station are wirelessly connected, and the first relay station and the second relay station The first terminal station and the second terminal station can communicate with each other via the relay station and the second base station, or the first terminal station and the second base station A relay station is wirelessly connected, and the first terminal station and the second terminal station are capable of wireless communication via the second relay station and the second base station. Wireless communication system.

The tenth configuration is the wireless communication system of the ninth configuration,
A control stand connected to the line control device,
When a communication failure occurs between the first base station and the line control device, the first relay station and the second relay station are wirelessly connected, and the first relay station and the second relay station The first terminal station and the control platform can be wirelessly communicated via the relay station and the second base station, or the first terminal station and the second relay station Are wirelessly connected, and the first terminal station and the control table can be wirelessly communicated with each other via the second relay station and the second base station.

The eleventh configuration is
A first terminal station, a radio control base, a first base station wirelessly connected to the first terminal station and the radio control base, a second terminal station, a second relay station, and Wireless communication comprising a second base station wirelessly connected to the second terminal station and the second relay station, and a line control device connected to the first base station and the second base station A system,
When a communication failure occurs between the first base station and the line control device, the radio control table and the second relay station are wirelessly connected, and the second relay station and the second base are connected. A wireless communication system, wherein wireless communication from the wireless control base to the second terminal station is possible via a station and the line control device.

The twelfth configuration is
A first terminal station, a first relay station, a radio control table, a first base station wirelessly connected to the first terminal station, the first relay station, and the radio control table; Wireless communication comprising two terminal stations, a second base station wirelessly connected to the second terminal station, and a line control device connected to the first base station and the second base station A system,
When a communication failure occurs between the first base station and the line control device, the first relay station and the second base station are wirelessly connected, and the first relay station and the second base station A wireless communication system capable of wireless communication from the wireless control base to the second terminal station via the base station and the line control device.

The thirteenth configuration is
A first terminal station, a radio control base, a first base station wirelessly connected to the first terminal station and the radio control base, a second terminal station, a second relay station, and Wireless communication comprising a second base station wirelessly connected to the second terminal station and the second relay station, and a line control device connected to the first base station and the second base station A system,
When no communication failure has occurred between the first base station and the line control device, the first terminal is connected to the first terminal via the first base station and the line control device. Wireless communication to a station is possible, and wireless communication from the wireless control base to the second terminal station is possible via the first base station, the second base station, and the line control device. Yes,
When a communication failure occurs between the first base station and the line control device, the wireless control base and the second relay station are wirelessly connected, and the first base station Wireless communication from the wireless control table to the first terminal station is possible, and the second control station, the second base station, and the line control device are connected to the second terminal from the wireless control table. A wireless communication system, wherein wireless communication to a terminal station is possible.

The fourteenth configuration is
A first terminal station, a first relay station, a radio control table, a first base station wirelessly connected to the first terminal station, the first relay station, and the radio control table; Wireless communication comprising two terminal stations, a second base station wirelessly connected to the second terminal station, and a line control device connected to the first base station and the second base station A system,
When no communication failure has occurred between the first base station and the line control device, the first terminal is connected to the first terminal via the first base station and the line control device. Wireless communication to a station is possible, and wireless communication from the wireless control base to the second terminal station is possible via the first base station, the second base station, and the line control device. Yes,
When a communication failure occurs between the first base station and the line control device, the first relay station and the second base station are wirelessly connected, via the first base station. Wireless communication from the wireless control base to the first terminal station is possible, and from the wireless control base via the first relay station, the second base station, and the line control device, A wireless communication system, wherein wireless communication to a second terminal station is possible.

  DESCRIPTION OF SYMBOLS 10 ... Control station, 11 ... Control station control apparatus, 11a ... Line control apparatus, 11b ... Control station control part, 12 ... Control station memory | storage part, 13 ... Control stand, 14 ... Operation management apparatus, 15 ... IF, 20 ... Multiplexing Radio unit (ODU), 21 ... antenna, 30 ... base station, 31 ... base station control unit, 32 ... base station storage unit, 33 ... base station transmission unit, 33a ... antenna, 34 ... base station reception unit, 34a ... antenna 35 ... IF, 40 ... relay station, 41 ... relay station control unit, 42 ... relay station storage unit, 43 ... base station wave radio unit, 43a ... antenna, 44 ... direct wave radio unit, 44a ... antenna, 50 ... Terminal station, 51 ... Terminal station control section, 52 ... Terminal station storage section, 53 ... Terminal station transmission section, 54 ... Terminal station reception section, 55 ... Changeover switch, 55a ... Antenna, 57 ... Operation display section, 58 ... Microphone 59 ... Speaker 60 ... Wireless control stand 61 ... Radio control table control unit, 62 ... Radio control table storage unit, 63 ... Radio control table transmission unit, 64 ... Radio control table reception unit, 65 ... Changeover switch, 65a ... Antenna, 67 ... Operation display unit, 68 ... Microphone 69 ... Speaker.

Claims (7)

A first terminal station, a first relay station, a first base station wirelessly connected to the first terminal station and the first relay station, a second terminal station, and a second relay A second base station wirelessly connected to the second terminal station and the second relay station, and a line control device connected to the first base station and the second base station. A wireless communication system comprising:
When a communication failure occurs between the first base station and the line control device, the first relay station and the second relay station are wirelessly connected, and the first relay station and the second relay station A wireless communication system, wherein the first terminal station and the second terminal station can communicate with each other via the relay station and the second base station. A wireless communication system according to claim 1, wherein
A control stand connected to the line control device,
When a communication failure occurs between the first base station and the line control device, the first relay station and the second relay station are wirelessly connected, and the first relay station and the second relay station A wireless communication system, wherein the first terminal station and the control table can wirelessly communicate with each other via the relay station and the second base station. A wireless communication system according to claim 1 or claim 2,
When a communication failure occurs between the first base station and the line control device, the first terminal station and the second relay station are wirelessly connected, and the second relay station and the second relay station A wireless communication system, wherein the first terminal station and the second terminal station can wirelessly communicate with each other via a base station. A wireless communication system according to claim 2,
When a communication failure occurs between the first base station and the line control device, the first terminal station and the second relay station are wirelessly connected, and the second relay station and the second relay station A wireless communication system, wherein the first terminal station and the control table can wirelessly communicate with each other via a base station. A first terminal station, a first relay station, a first base station wirelessly connected to the first terminal station and the first relay station, a second terminal station, and a second relay A second base station wirelessly connected to the second terminal station and the second relay station, and a line control device connected to the first base station and the second base station. A wireless communication system comprising:
When a communication failure occurs between the first base station and the line control device, the first relay station and the second relay station are wirelessly connected, and the first relay station and the second relay station The first terminal station and the second terminal station can communicate with each other via the relay station and the second base station, or the first terminal station and the second base station A relay station is wirelessly connected, and the first terminal station and the second terminal station are capable of wireless communication via the second relay station and the second base station. Wireless communication system. A first terminal station, a radio control base, a first base station wirelessly connected to the first terminal station and the radio control base, a second terminal station, a second relay station, and Wireless communication comprising a second base station wirelessly connected to the second terminal station and the second relay station, and a line control device connected to the first base station and the second base station A system,
When a communication failure occurs between the first base station and the line control device, the radio control table and the second relay station are wirelessly connected, and the second relay station and the second base are connected. A wireless communication system, wherein wireless communication from the wireless control base to the second terminal station is possible via a station and the line control device. A first terminal station, a first relay station, a radio control table, a first base station wirelessly connected to the first terminal station, the first relay station, and the radio control table; Wireless communication comprising two terminal stations, a second base station wirelessly connected to the second terminal station, and a line control device connected to the first base station and the second base station A system,
When a communication failure occurs between the first base station and the line control device, the first relay station and the second base station are wirelessly connected, and the first relay station and the second base station A wireless communication system capable of wireless communication from the wireless control base to the second terminal station via the base station and the line control device.

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