JP6058446B2 - Wireless communication system - Google Patents

Description

  The present invention relates to a wireless communication system including a terminal station, a base station wirelessly connected to the terminal station, and a line control device connected to the base station.

  In a conventional wireless communication system, for example, when a call is made from a terminal station A to a terminal station B via a base station, a communication connection request is transmitted from the terminal station A via the base station and the line control device to the terminal. When the communication connection response is received from the terminal station B via the base station and the line control device, the call is started between the terminal station A and the terminal station B. The communication connection request and the communication connection response are performed using a radio control channel in the radio channel between the terminal station and the base station. A telephone call is performed using a wireless communication channel.

  Some conventional wireless communication systems include a wireless control table as a kind of terminal station. The radio control table has a control function for controlling the terminal stations, and is for, for example, issuing an urgent instruction to each terminal station by simultaneous communication. In order to perform such a control function, the wireless control base may check the usage status of the wireless communication channel, that is, check whether there is a free wireless communication channel. For example, when making a call with a terminal station from a wireless control table via a base station, after confirming the usage status of the wireless communication channel, if the wireless communication channel is available, the terminal station is called. I have to.

A sequence when a terminal station is called from a wireless control table in a conventional wireless communication system will be described with reference to FIG. FIG. 9 is a diagram showing a communication connection sequence according to a conventional example.
First, when a wireless channel status inquiry operation is performed in the standby wireless control stand (step S91), a wireless communication channel usage status inquiry signal is transmitted to the base station via the wireless control channel, and transmitted from the base station to the line control device. (Step S92). The line control device confirms the use status (free state) of the radio communication channel, transmits a radio communication channel use status notification to the base station, and the base station sends the radio control channel to the radio control table (step S93). . Based on the received wireless communication channel usage status notification, the wireless control console displays the wireless communication channel usage status (step S94).

The operator of the wireless control console looks at the displayed wireless communication channel usage status, and performs a call operation on the terminal station if the wireless communication channel is available (step S95). Then, a communication connection request is transmitted to the terminal station via the base station and the line control device (step S96). When the communication connection request is received, the terminal station transmits a communication connection response to the radio control table via the base station and the line control device (step S97). At this time, a communication connection request and a communication connection response are transmitted by the radio control channel between the base station and the terminal station and between the base station and the radio control table.
Thereafter, communication is started between the wireless control console and the terminal station using the wireless communication channel (step S98).

As described above, the wireless control channel that transmits the wireless communication channel usage status to the wireless control base is a wireless channel that is also used for transmission / reception of communication connection signals (communication connection requests and communication connection responses). For this reason, if the number of inquiries about the usage status of the radio communication channel increases from the radio control table, the frequency of use of the radio control channel will increase, and even if there are empty channels in the radio communication channel, communication may not be established due to congestion of the radio control channel there's a possibility that.
In addition, the operator of the wireless control console makes an inquiry about the usage status of the wireless communication channel before performing communication, which is troublesome.

  Patent Document 1 below discloses a wireless communication system that performs communication using a wireless control channel and a wireless communication channel.

JP 2012-186578 A

  It is an object of the present invention to efficiently notify the usage status of a wireless communication channel.

A typical configuration of the present invention for solving the above problems is as follows. That is,
A wireless communication system comprising: first and second terminal stations; a base station that communicates with the first and second terminal stations using a wireless communication channel; and a line control device connected to the base station. ,
When the line control device receives a communication connection request from the first terminal station to the second terminal station from the first terminal station via the base station, the first terminal station specifies If it is a terminal station, notify the first terminal station via the base station of the usage status of the wireless communication channel of the base station, and if the first terminal station is not the specific terminal station, A wireless communication system, wherein the first terminal station is not notified of a usage status of a wireless communication channel of the base station.

  According to the above configuration, the wireless communication channel usage status can be notified efficiently.

It is a figure which shows the structure of the control station and base station which concern on embodiment of this invention. It is a figure which shows the structure of the terminal station which concerns on embodiment of this invention. It is a figure which shows the communication connection sequence (with wireless communication channel availability) which concerns on embodiment of this invention. It is a figure which shows the communication connection sequence (no wireless communication channel vacancy) which concerns on embodiment of this invention. It is a figure which shows operation | movement of the line control apparatus which concerns on embodiment of this invention. It is an example of a display screen of a radio control table when there is no empty channel when calling according to an embodiment of the present invention. It is a figure which shows the radio | wireless carrier frequency allocation used with the radio | wireless communications system which concerns on embodiment of this invention. It is a figure which shows the flame | frame structure used with the radio | wireless communications system which concerns on embodiment of this invention. It is a figure which shows the communication connection sequence which concerns on a prior art example.

(Configuration of wireless communication system)
A configuration of a wireless communication system according to an embodiment of the present invention 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.

  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.

  Further, each radio 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, a radio control channel (also simply referred to as a control channel) is assigned to that slot. C and wireless communication channels (also simply referred to as communication channels) S1, S2, and S3 are assigned. In addition, when representing communication channel S1, S2, S3, it calls the communication channel 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 C, the number of communication channels S, and the like can be appropriately changed according to the scale of the system and the purpose of use.

Next, the configuration of FIG. 1 will be described.
The control table 10 is signal-connected to the line control device 20, and the line control device 20 is signal-connected to the operation management device 30 and the base station 40. The base station 40 is signal-connected to the terminal station 50 (see FIG. 2) by radio. One base station 40 can be signal-connected to a plurality of terminal stations 50, and one line control device 20 can be signal-connected to a plurality of base stations 40.
In FIG. 1, the control table 10, the line control device 20, and the operation management device 30 are separated from each other. However, for example, the control table control unit 11 and the line are configured as a control station so as to include them as a unit. The control device control unit 21 and the operation management device control unit 31 may be one control station control unit, and the control table storage unit 12, the line control device storage unit 22, and the operation management device storage unit 32 may be one control station storage unit. .
In addition to the control table 10, the line control device 20 and the operation management device 30 may be configured integrally.

  The control table 10 includes a control unit 11, a storage unit 12, a display unit 13, an operation unit 14, a microphone and a speaker (not shown) configured by a CPU and the like, and can communicate with each terminal station 50. The control table 10 has a control function that can monitor, interrupt, and forcibly disconnect other calls, for example, and an operator operates the control table 10 to communicate with each terminal station 50 or each terminal station. Operations such as issuing an urgent instruction to 50 are performed. The terminal station 50 will be described later.

The line control device 20 includes a control unit 21, a storage unit 22, and an operation display unit (not shown) configured by a CPU or the like.
The storage unit 22 includes a communication channel management table, and the communication channel management table stores the status of whether all communication channels S to be managed by the line control device 20 are in use or are empty. The communication channel vacant state in the communication channel management table is constantly updated by the information received from the base station 40.

  In addition, the specific terminal station is registered in the storage unit 22. Specifically, specific terminal station identification information for identifying the specific terminal station, for example, a telephone number of the specific terminal station may be registered. The specific terminal station is a terminal station to which a radio communication channel use status notification is transmitted from the line control device 20 when a call operation is performed. In the present embodiment, the wireless control base 70 is registered in the storage unit 22 as a specific terminal station. The telephone number registration of the specific terminal station is performed by the operator via the operation display unit of the line control device 20 or the operation management device 30, for example.

  The control unit 21 performs call control from the terminal station 50 or control such as setting of a communication route and a communication channel, and maintains and manages communication connections and service areas between the plurality of terminal stations 50. For example, when a call is made from the terminal station 50A to the terminal station 50B, if the communication channel S is free, a communication connection operation is performed between the terminal station 50A and the terminal station 50B.

  Specifically, when a call is made from the terminal station 50A to the terminal station 50B and a communication connection request is received from the terminal station 50A via the base station 40A, the control unit 21 receives the communication channel S when it is free. A communication connection request from the terminal station 50A is transmitted to the terminal station 50B via the base station 40B. When the communication channel S is not free, the communication connection request from the terminal station 50A is not transmitted to the terminal station 50B, and the standby state is restored. When the communication connection response is received from the terminal station 50B via the base station 40B, the communication connection response is transmitted to the terminal station 50A via the base station 40A, and the terminal station 50A and the terminal station 50B are communicating. To. At this time, a free communication channel S is automatically assigned to the terminal station 50A and the terminal station 50B with reference to the communication channel management table.

In addition, when the terminal station 50A is registered as a specific terminal station in the storage unit 22, the control unit 21 is called from the terminal station 50A to the terminal station 50B, and is transmitted from the terminal station 50A via the base station 40. When the communication connection request is received, a wireless communication channel usage status notification indicating whether or not the communication channel S is available is transmitted to the terminal station 50A via the base station 40. In parallel, when the communication channel S is free, the above-described communication connection operation is performed between the terminal station 50A and the terminal station 50B.
Further, when the terminal station 50A is not registered as the specific terminal station, the control unit 21 performs the same processing as when a call is made from the terminal station 50 that is not the specific terminal station to the terminal station 50, that is, the terminal station The wireless communication channel usage status notification to 50A is not performed.

  The operation management apparatus 30 includes a control unit 31, a storage unit 32, and an operation display unit (not shown) configured by a CPU or the like, and performs basic management information setting and maintenance such as system status confirmation. It has the function to do. Further, the communication history between the terminal stations 50 is stored in the storage unit 32. In this communication history, when communication between the terminal stations 50 or communication between the terminal station 50 and the control table 10 is performed, the time from the start of communication to the end of communication, the terminal station number, the communication type (individual communication / Group communication) etc. are recorded.

  Next, the configuration of the base station 40 will be described. The base station 40 includes a transmission radio 43, a reception radio 44, a control unit 41 including a CPU, and a storage unit 42. The transmission radio 43 wirelessly transmits information from the control table 10 or the like. It transmits to the terminal station 50 by the carrier F1. The receiving radio 44 receives information transmitted from the terminal station 50 via the radio carrier f1. In this way, the base station 40 communicates with the terminal station 50 through the wireless communication channel S.

Next, the configuration of the terminal station 50 will be described with reference to FIG. FIG. 2 is a block diagram illustrating a schematic configuration of the terminal station 50. A plurality of terminal stations 50 can be wirelessly connected to one base station 40. The terminal station 50 includes a mobile station such as an in-vehicle wireless device and a portable wireless device, and a wireless control base 70, but the configuration is almost the same.
Note that the terminal station 50 shown in FIG. 2 uses, for example, a pair wave of the uplink radio carrier f1 and the downlink radio carrier F1, and shows, for example, a radio communication apparatus of the press talk system. It can also be configured by a wireless communication device that can.
In FIG. 2, 53 is an antenna for performing transmission / reception with the base station 40, 54 is a changeover switch for switching transmission / reception, 55 is a reception unit, 56 is a reception signal processing unit, 57 is a speaker, and 51 is a control unit. , 52 is a storage unit, 58 is a display unit, 59 is an operation unit, 60 is a microphone, 61 is a transmission signal processing unit, and 62 is a transmission unit.

  The communication operation of this terminal station 50 will be described. First, the operation unit 59 is operated, for example, the other party's terminal station number is input using the numeric keypad, and the call button is pressed. Then, a communication connection request is transmitted to the line control device 20 via the base station 40. The communication connection request includes a caller address (for example, the telephone number of the caller's terminal station 50) that is caller identification information indicating the caller, and a destination address (for example, the callee identification information that indicates the callee). Phone number of the terminal station 50). Then, when a communication connection response from the call destination is received from the line control device 20 via the base station 40, the terminal station 50 is brought into a communication state.

  When the communication state is established, the audio signal input from the microphone 60 is subjected to predetermined signal processing for transmission by the transmission signal processing unit 61 and then input to the transmission unit 62. The signal input to the transmission unit 62 is subjected to predetermined modulation for transmission, converted to a predetermined transmission frequency f1, output from the antenna 53 via the changeover switch 54, and the reception radio 44 of the base station 40. Sent to.

  On the other hand, the radio carrier F 1 from the transmission radio 43 of the base station 40 is received by the antenna 53 and input to the receiving unit 55 via the changeover switch 54. The signal input to the receiving unit 55 is amplified at a high frequency, converted into a predetermined intermediate frequency, further demodulated, and supplied to the received signal processing unit 56. The reception signal processing unit 56 outputs an audio signal from the speaker 57 after predetermined signal processing. In the case of data, the data is displayed on the display unit 58.

The wireless control stand 70 will be described.
For example, when a plurality of base stations connected to the control table 10 constitute the same system, for example, a prefectural disaster prevention radio system, some of the plurality of base stations For example, when configuring a city disaster prevention radio system, it is used as a control stand for controlling terminal stations under the city disaster prevention radio system. For example, the disaster prevention radio system of M prefecture is comprised by the base station A and its affiliated terminal station, and the base station B and its affiliated terminal station, and the disaster prevention radio system of N city by the base station A and its affiliated terminal station Is configured. In this case, the control table 10 controls the terminal stations constituting the disaster prevention radio system of M prefecture, and the radio control table 70 controls the terminal stations constituting the disaster prevention radio system of N city.

  The radio control table 70 has a control function that can forcibly disconnect communication between the other terminal stations 50 in an emergency, and gives an urgent instruction to each terminal station by, for example, simultaneous communication. Further, normally, when the wireless communication channel S becomes available, for example, communication and instructions are given to each terminal station by simultaneous communication or the like.

  As described above, the wireless control base 70 is a type of the terminal station 50 and includes the function of the terminal station 50. The configuration of the wireless control base 70 is almost the same as the configuration of the terminal station 50 shown in FIG. 2, and includes an antenna 73 for performing transmission / reception with the base station 40, a changeover switch 74 for switching transmission / reception, a reception unit 75, and reception. A signal processing unit 76, a speaker 77, a control unit 71, a storage unit 72, a display unit 78, an operation unit 79, a microphone 70, a transmission signal processing unit 71, and a transmission unit 72 are provided. Functions other than the control unit 71 are the same as those of the other terminal stations 50.

  In the present embodiment, the wireless control base 70 is used as the specific terminal station described above. Therefore, the control unit 71 has the following functions when functioning as a specific terminal station. In other words, when the wireless control table 70 is in a standby state, the control unit 71 receives an individual communication call operation for another terminal station 50 by the operator via the operation unit 79, for example, via the base station 40A. A communication connection request is transmitted to the control device 20 using the radio control channel C. The standby state of the wireless control stand 70 is a state in which a call request from another terminal station 50 can be accepted. The communication connection request includes a caller address indicating the caller (for example, a telephone number of the wireless control console 70) and a destination address indicating the callee (for example, the telephone number of the terminal station 50).

  After transmitting the communication connection request, when the wireless communication channel usage status notification is received from the line control device 20 via the base station 40A using the wireless control channel C, the control unit 71 displays the wireless communication channel usage status wirelessly. The information is displayed on the display unit 78 of the control table 70. The wireless communication channel usage status is information indicating whether or not there is a vacancy in the wireless communication channel SA of the base station 40A and the wireless communication channel SB of the base station 40B to which the called terminal station 50 is connected. is there. The base station 40A and the base station 40B may be the same base station 40.

  The control unit 71 displays the wireless communication channel usage status on the display unit 78 and waits for a communication connection response to be transmitted from the line control device 20 through the base station 40A through the wireless control channel C. And when a communication connection response is received, the wireless control stand 70 will be in the communication state. For example, a call is made with the terminal station 50 that is the call destination. In this state, the operator of the wireless control console 70 performs communication through the wireless communication channel S.

  Here, the communication connection response is a response to the communication connection request transmitted by the wireless control base 70, and when the call destination terminal station 50 is in a standby state where communication is possible, from the call destination terminal station 50, It is transmitted via the base station 40B, the line control device 20, and the base station 40A. If the called terminal station 50 is not in the standby state, it is not transmitted, or a communication connection impossible response indicating that communication connection is not possible is transmitted. When the communication connection response is not transmitted within the predetermined time or the communication connection impossible response is transmitted, the control unit 71 returns the wireless control base 70 to the standby state.

  As described above, when a call operation is accepted by the radio control table 70 as the specific terminal station, the radio communication channel usage status is displayed. Therefore, when communication connection is not established with the call destination terminal station 50, the radio control table 70 is displayed. Can know the reason why the communication connection is not established. That is, it is possible to know whether there is no free wireless communication channel or whether the called terminal station 50 is not communicable for reasons such as communication. When the terminal station 50 of the call destination is communicating, the operator of the radio control table 70 performs the call operation after a while or after forcibly disconnecting. Therefore, it is possible to suppress repeating the calling operation in a short time. As a result, use of the radio control channel C is suppressed.

  In addition, since a wireless communication channel usage status notification can be received by a communication connection request from the wireless control console 70, there is no need to transmit a wireless communication channel usage status inquiry separately from the communication connection request as in the conventional example. Therefore, the use of the radio control channel C is reduced.

  Next, a communication connection sequence according to the present embodiment when there is a free wireless communication channel will be described with reference to FIG. FIG. 3 is a diagram showing a communication connection sequence (with wireless communication channel available) according to the present embodiment. FIG. 3 shows a case where the base station 40A to which the wireless control base 70 is connected and the base station 40B to which the called terminal station 50 is connected are the same base station. In the description, the base station 40A and the base station 40B will be described separately.

  First, when a call operation for the terminal station 50 (in this case, a call operation for individual communication) is performed on the wireless control stand 70 in the standby state (step S1), a communication connection request is transmitted to the base station 40A through the radio control channel C. Then, it is transmitted from the base station 40A to the line control device 20 (step S2). When receiving the communication connection request, the line control device 20 refers to the communication channel management table in the storage unit 22 and transmits a wireless communication channel usage status notification to the base station 40A. It transmits to the wireless control stand 70 (step S3). This wireless communication channel usage status notification includes information on the availability of the wireless communication channel SA of the wireless channel of the base station 40A and information on the availability of the wireless communication channel SB of the wireless channel of the base station 40B.

  When the wireless communication channel usage status notification is received, the wireless control console 70 displays the wireless communication channel usage status on the display unit 78 (step S4). As a result, the operator or administrator of the wireless control console 70 can know the availability of the wireless communication channel SA and the wireless communication channel SB.

  When receiving the communication connection request from the radio control table 70 in step S2, the line control device 20 transmits the communication connection request to the base station 40B, and the base station 40B transmits the communication connection request to the terminal through the radio control channel C. Transmit to the station 50 (step S5). When receiving the communication connection request, if the terminal station 50 is in the standby state, the terminal station 50 transmits a communication connection response to the base station 40B through the radio control channel C, and the base station 40B transmits the communication connection response to the line control device 20. Transmit (step S6). When the terminal station 50 is not in the standby state, the terminal station 50 does not transmit a communication connection response or transmits a communication connection impossible response indicating that communication connection cannot be performed.

  When receiving the communication connection response from the terminal station 50, the line control device 20 transmits the communication connection response to the base station 40A, and the base station 40A transmits to the radio control table 70 through the radio control channel C (step S7). ). Thus, communication is started between the wireless control console 70 and the terminal station 50 (step S8), and the wireless control console 70 and the terminal station 50 are in communication.

If the communication connection response from the terminal station 50 cannot be received within a predetermined time after transmitting the communication connection request in step S5, or if the communication connection impossible response from the terminal station 50 is received, the line control device 20 A communication connection response is not transmitted to the wireless control table 70, or a communication connection impossible response is transmitted to the wireless control table 70.
When the communication connection response from the line control device 20 cannot be received within a predetermined time, or when the communication connection failure response from the line control device 20 is received, the radio control table 70 notifies the operator to that effect. Return to standby mode.

  Note that the base station 40A and the base station 40B may be the same base station. The example of FIG. 3 shows a case where the base station 40A and the base station 40B are the same base station.

  Next, a communication connection sequence according to the present embodiment when there is no free wireless communication channel will be described with reference to FIG. FIG. 4 is a diagram showing a communication connection sequence (no wireless communication channel available) according to the present embodiment.

  First, when a call operation is performed on the terminal station 50 in the standby radio control table 70 (step S21), a communication connection request is transmitted to the base station 40 through the radio control channel C, and line control is performed from the base station 40. It is transmitted to the device 20 (step S22). When receiving the communication connection request, the line control device 20 refers to the communication channel management table in the storage unit 22 and transmits a wireless communication channel usage status notification to the base station 40, and the base station 40 uses the wireless control channel C. It transmits to the wireless control stand 70 (step S23).

  When the wireless communication channel usage status notification is received, the wireless control console 70 displays the wireless communication channel usage status (no space available) on the display unit 78 (step S24). As a result, the operator or administrator of the wireless control console 70 can know that there is no space in at least one of the wireless communication channel SA and the wireless communication channel SB. Note that the wireless communication channel usage status notification to the wireless control base 70 includes the detailed usage status of the wireless communication channel SA (which channel is in use and which channel is empty) and the detailed usage status of the wireless communication channel SB ( It may be configured to notify which channel is in use and which channel is free. In this case, it is preferable that the radio control table 70 displays the detailed usage status of each channel SA, SB.

  Further, when either one of the wireless communication channel SA and the wireless communication channel SB is not available, the line control device 20 does not transmit a communication connection request to the terminal station 50. Therefore, no communication connection operation is performed between the wireless control console 70 and the terminal station 50.

  Next, the operation (processing) of the line control apparatus according to the present embodiment will be described with reference to FIG. FIG. 5 is a diagram illustrating the operation of the line control device 20 according to the present embodiment.

  First, the line control device 20 receives and accepts a communication connection request from the terminal station 50A to the terminal station 50B via the base station 40 in the standby state (step S50) (step S51). The line control device 20 examines the caller address (that is, the terminal station identification information for identifying the terminal station 50A) included in the received communication connection request, and the caller address is registered in the specific terminal station ( It is determined whether or not it corresponds to the telephone number of the wireless control base 70) (that is, specific terminal station identification information for identifying a specific terminal station). That is, the line control device 20 determines whether the terminal station 50A is a specific terminal station based on the terminal station identification information received from the terminal station 50A and the specific terminal station identification information registered in the storage unit 22. (Step S52).

If the received communication connection request is a communication connection request from a specific terminal station (wireless control base 70) registered in the line control device 20 (Yes in step S52), a wireless communication channel usage notification is sent to the base station. 40, the base station 40 transmits to the terminal station 50A (radio control table 70) that is the transmission source of the communication connection request via the radio control channel C (step S53).
If the received communication connection request is not a communication connection request from a specific terminal station (wireless control base 70) registered in the line control device 20 (No in step S52), a wireless communication channel usage status notification is sent to the base station. Without transmitting to 40, the process proceeds to step S54.

Then, the line control device 20 determines whether or not there is a vacancy in the radio communication channel S of the base station 40 to which the caller terminal station 50A (wireless control table 70) and the callee terminal station 50B belong (step S54). ) If there is a vacancy in the wireless communication channel S (Yes in step S54), communication connection processing is performed between the caller terminal station 50A (wireless control table 70) and the callee terminal station 50B (step S55). ) When communication ends (step S56), the process returns to the standby state (step S50). In the communication connection process, as shown in FIG. 3, a communication connection request is transmitted to the call destination, a communication connection response is received from the call destination, transmitted to the call source, and the call source and the call destination are in communication. It is a process to make.
If there is no free space in the wireless communication channel S (No in step S54), the process returns to the standby state (step S50) without performing the communication connection process between the caller and the callee.

  In FIG. 5, the communication connection operation is performed after the wireless communication channel usage status notification is transmitted. However, the wireless communication channel usage status transmission and the communication connection operation are performed in parallel. It is also possible to do.

  Next, an example of a display screen of the wireless control console when there is no empty channel at the time of calling according to the present embodiment will be described with reference to FIG. FIG. 6 is a display screen example of the display unit 78 of the radio control table 70 when there is no empty channel when calling according to the present embodiment, FIG. 6A is a display example during calling, and FIG. ) Is a display example when the wireless communication channel S is not empty.

  In FIG. 6A, 101 indicates that a call is being made, and 102 indicates that the call destination is the terminal station 50 of the General Affairs Division. The terminal station 50 of this general affairs section has a telephone number of 200. Reference numeral 103 denotes an area where the use status of the radio communication channel SA of the base station A to which the caller radio control table 70 is connected is displayed. Reference numeral 104 denotes an area where the use status of the radio communication channel SB of the base station B to which the called terminal station 50 is connected is displayed. There are seven radio communication channels SA and seven radio communication channels SB. The radio control channel C is indicated by 103 and 104 as “control”. Reference numeral 105 denotes a button for canceling the call.

  In FIG. 6B, 106 is a display indicating that the wireless communication channel S is in use, and is a display indicating that there is no free space in at least one of the wireless communication channel SA and the wireless communication channel SB. 103 and 104 indicate which terminal station 50 is using the seven wireless communication channels S, respectively. 107 is a call button used when calling after a while. When the call button is pressed, the wireless control console 70 automatically calls the terminal station 50 of the General Affairs Division after a predetermined time.

According to this embodiment, at least the following effects can be obtained.
(A1) When a call operation is performed from a terminal station and the line control device receives a communication connection request from the terminal station, the terminal station is a specific terminal station (for example, a radio control table) registered in the line control device. Since the usage status of the wireless communication channel is notified to the specific terminal station, the handler of the specific terminal station does not need to inquire in advance about the usage status of the wireless communication channel in the conventional manner when calling. , Can automatically grasp the usage status of the wireless communication channel. Therefore, it is possible to distinguish whether the reason for the communication connection failure is due to the usage status of the wireless communication channel or the status of the partner station, and depending on the status of the partner station, The call operation is performed after the forced disconnection process. Therefore, it is possible to suppress repeating the calling operation in a short time. As a result, since the frequency of transmission of the radio control channel C is reduced, it is possible to prevent the communication connection from being disabled due to influence on the communication connection, for example, congestion of the radio control channel.
(A2) The line control device registers the specific terminal station identification information for identifying the specific terminal station in its storage unit in advance, and the communication connection request including the terminal station identification information for identifying the terminal station from the terminal station Since the terminal station that transmitted the communication connection request is determined to be a specific terminal station based on the received terminal station identification information and the registered specific terminal station identification information, a call is made. It is possible to easily determine whether or not the terminal station is a specific terminal station. In addition, the specific terminal station can be easily designated and changed.
(A3) Upon receiving a communication connection request from the first terminal station, which is a specific terminal station, to the second terminal station, the line control apparatus connects the first terminal station to the first terminal station. Since the use status of the radio communication channel of one base station and the use status of the radio communication channel of the second base station to which the second terminal station is connected are notified, Even when the two base stations are different base stations, the use status of the wireless communication channel can be known.

In addition, this invention is not limited to embodiment mentioned above, It can implement in various deformation | transformation and a combination.
For example, the wireless control table 70 may be a spare machine for the control table 10. In this case, the range covered by the control functions of the control table 10 and the wireless control table 70 is all terminal stations 50.
In the above-described embodiment, the line control device 20 and the base station 40 are described as separate devices, but these may be configured as one device. Further, at least the control platform 10, the line control device 20, and the base station 40 function as control stations on the system.
In the above-described embodiment, the case where the line control device 70 notifies the terminal station 50 of the communication connection request for individual communication to the terminal station 50 is described as an example. . However, it goes without saying that the present invention is not limited to this, and can be widely applied to various communication connection requests such as group communication from the wireless control base 70, for example. However, in the case of a communication type that automatically forcibly disconnects in response to a communication connection request from the wireless control console 70, the line control device 20 may suppress notification of the wireless communication channel usage status. That is, the line control device 20 determines whether or not to notify the wireless communication channel usage status based on the information identifying the communication type of the communication in addition to the terminal station identification information included in the communication connection request. Also good. In this case, for example, the line control device 20 holds in advance the identification information of the communication type for performing the notification of the wireless communication channel usage status in the storage unit 22, and the communication type included in the received communication connection request is stored in the storage unit 22. When the stored identification information matches, the wireless communication channel usage status is notified. Thereby, the notification of the wireless communication channel usage status can be realized more efficiently.
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 wireless communication system comprising: first and second terminal stations; a base station that communicates with the first and second terminal stations using a wireless communication channel; and a line control device connected to the base station. ,
When the line control device receives a communication connection request from the first terminal station to the second terminal station from the first terminal station via the base station, the first terminal station specifies If it is a terminal station, notify the first terminal station via the base station of the usage status of the wireless communication channel of the base station, and if the first terminal station is not the specific terminal station, A wireless communication system, wherein the first terminal station is not notified of a usage status of a wireless communication channel of the base station.

The second configuration is the wireless communication system of the first configuration,
The line control device previously registers specific terminal station identification information for identifying the specific terminal station in a storage unit of the line control device, and identifies the first terminal station from the first terminal station. If the communication connection request including the terminal station identification information to be received is received, based on the terminal station identification information and the specific terminal station identification information registered in the storage unit, whether the first terminal station is the specific terminal station A wireless communication system characterized by determining whether or not.

A third configuration is the wireless communication system of the first configuration or the second configuration,
The base station includes a first base station that is wirelessly connected to the first terminal station, and a second base station that is wirelessly connected to the second terminal station,
When the line control apparatus receives the communication connection request from the first terminal station, if the first terminal station is the specific terminal station, the line control apparatus transmits the first base station to the first terminal station. When the first terminal station is not the specific terminal station, the first base station and the second base station are notified of the usage status of the wireless communication channel between the first base station and the second base station. A wireless communication system, characterized in that a usage status of a wireless communication channel of a second base station is not notified.

A fourth configuration is the wireless communication system of the third configuration, and further,
A third terminal station connected to the first base station;
A control stand including the first to third terminal stations, and the line control device controls all terminal stations that are targets of the communication connection processing;
The wireless communication system, wherein the first terminal station is the specific terminal station, and the third terminal station is a control target and the second terminal station is not a control target.

The fifth configuration is
A wireless communication system comprising: first and second terminal stations; a base station that communicates with the first and second terminal stations using a wireless communication channel; and a line control device connected to the base station. ,
When the line control device receives a communication connection request from the first terminal station to the second terminal station from the first terminal station via the base station, the first terminal station specifies If it is a terminal station, notify the first terminal station via the base station of the usage status of the wireless communication channel of the base station, and if the first terminal station is not the specific terminal station, If the wireless communication channel of the base station does not notify the first terminal station of the use status of the wireless communication channel of the base station, and there is a vacancy in the wireless communication channel of the base station, communication connection processing between the first and second terminal stations And a communication connection process between the first and second terminal stations is not performed when there is no available radio communication channel of the base station.

The sixth configuration is
A line control apparatus used in a wireless communication system comprising: first and second terminal stations; and a base station that communicates with the first and second terminal stations via a wireless communication channel, and connected to the base station Because
When the line control device receives a communication connection request from the first terminal station to the second terminal station from the first terminal station via the base station, the first terminal station specifies If it is a terminal station, notify the first terminal station via the base station of the usage status of the wireless communication channel of the base station, and if the first terminal station is not the specific terminal station, A line control apparatus, wherein the first terminal station is not notified of a use status of a radio communication channel of the base station.

  10 .... Control table, 11 .... Control table control unit, 12 .... Control table storage unit, 13 .... Control table display unit, 14 .... Control table operation unit, 20 .... Line control device, 21 .... Line control Device control unit, 22 .... Line control device storage unit, 30 ... Operation management device, 31 ... Operation management device control unit, 32 ... Operation management device storage unit, 40 ... Base station, 41 ... Base station control , 42 .. Base station storage unit, 43 .. Base station transmission radio unit, 44 .. Base station reception radio unit, 50 .. Terminal station, 51 .. Terminal station control unit, 52. , 53 .. Antenna, 54 .. Changeover switch, 55 .. Receiving unit, 56 .. Received signal processing unit, 57 .. Speaker, 58 .. Terminal station display unit, 59 .. Terminal station operation unit, 60. -Microphone, 61-Transmission signal processing unit, 62-Transmission unit, 70-Wireless control table.

Claims (3)

A wireless communication system comprising: first and second terminal stations; a base station that communicates with the first and second terminal stations using a wireless communication channel; and a line control device connected to the base station. ,
When the line control device receives a communication connection request from the first terminal station to the second terminal station from the first terminal station via the base station, the first terminal station specifies If it is a terminal station, notify the first terminal station via the base station of the usage status of the wireless communication channel of the base station, and if the first terminal station is not the specific terminal station, A wireless communication system, wherein the first terminal station is not notified of a usage status of a wireless communication channel of the base station. A wireless communication system according to claim 1, wherein
The line control device previously registers specific terminal station identification information for identifying the specific terminal station in a storage unit of the line control device, and identifies the first terminal station from the first terminal station. If the communication connection request including the terminal station identification information to be received is received, based on the terminal station identification information and the specific terminal station identification information registered in the storage unit, whether the first terminal station is the specific terminal station A wireless communication system characterized by determining whether or not. A wireless communication system according to claim 1 or claim 2,
The base station includes a first base station that is wirelessly connected to the first terminal station, and a second base station that is wirelessly connected to the second terminal station,
When the line control apparatus receives the communication connection request from the first terminal station, if the first terminal station is the specific terminal station, the line control apparatus transmits the first base station to the first terminal station. When the first terminal station is not the specific terminal station, the first base station and the second base station are notified of the usage status of the wireless communication channel between the first base station and the second base station. A wireless communication system, characterized in that a usage status of a wireless communication channel of a second base station is not notified.

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