JP2017092623A - Radio system, base station control device, base station, terminal device, and base station control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio system, base station control device, base station, terminal device, and base station control method that allow the base station to operate by itself when an approach line is cut off and can avoid interference to a mobile station device during operation by itself.SOLUTION: A radio system 1 includes: a plurality of base stations 3 each having a communication area; and a base station control device 2 connected with the base stations 3 via approach lines 4. When an approach line 4 becomes unavailable for communication, a corresponding base station 3 sets a communication channel in a communication area 5 of its base station to a fixed channel, and the base station control device 2 causes the base stations 3 other than the base station that has set the communication channel in the communication area 5 of its base station to the fixed channel to restrain communication using the fixed channel.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a radio system, a base station control device, a base station, a terminal device, and a base station control method.

  The wireless system for business use installed in each municipality uses a base station installed in the municipality as a relay station for wireless communication between a command system device installed in the headquarters and a plurality of mobile terminal devices. Voice and data communication. Communication control of each mobile terminal apparatus is performed by a line control apparatus connected to the base station via an approach line. When the approach line is disconnected, communication between the connection destination base station and the mobile terminal devices under the base station and communication between mobile terminal devices under the base station are disabled. Various techniques are used to solve such problems.

  For example, as disclosed in Patent Document 1, when an approach line is disconnected, if a base station is operable, a communication area is secured by controlling wirelessly from another terminal so that the base station can operate independently.

  Patent Document 2 discloses a multi-channel access communication system that includes a multi-channel line control device, a communication base station, and a communication terminal device, and uses a plurality of communication channels in common. Is equipped with a fixed channel operation instruction signal generating device, and in response to a line control failure or disconnection of the line control connection to the communication base station, a fixed channel operation instruction signal is transmitted from the communication base station to the communication terminal device. It is disclosed to do. In addition, Patent Documents 3 and 4 disclose techniques related to operation when the approach line is disconnected. Further, in Patent Document 5, when there are a plurality of radio base stations using the same radio channel in each other's communication area, a radio frame storing information indicating an operation method of the radio channel to be used is transmitted and received. A technique for dynamically changing a radio channel when a radio base station ahead of the radio frame fixes the radio channel is disclosed.

JP2013-247523A JP-A-9-331570 JP 2001-218266 A JP 2007-259042 A JP-A-2005-340993

  In the configurations disclosed in Patent Documents 1 and 2, the independent operation of the base station is controlled by another terminal, and the operator needs to control the base station by operating the terminal. In addition, the base station whose approach line has become non-communication fixes the channel used for wireless communication within the communication area to a fixed channel set in advance.

  On the other hand, the same channel may be used in the communication areas of other base stations. Therefore, interference may occur in a communication area overlapping with other base stations. Patent Documents 1 to 4 do not disclose a technique for solving this problem. The configuration disclosed in Patent Document 5 is based on the premise of communication between base stations, and avoids interference in a communication area overlapping with a base station that has been switched to a single operation by disconnecting a line connecting the base stations. It does not disclose how to do.

  The present invention relates to a radio system, a base station control device, a base station, and a terminal that can avoid interference in a communication area overlapping with another base station even when the base station is switched to single operation when a line connecting the base stations is disconnected An object is to provide an apparatus and a base station control method.

  A radio system according to an aspect of the present invention is a radio system including a base station that receives channel information of a terminal device and a base station controller connected to the base station, wherein the base station is the base station When communication with the control device is disabled, the communication channel of the local station is set as a fixed channel, and the base station control device uses the fixed channel for base stations other than the base station with the communication channel of the local station as a fixed channel. Let me limit.

  A base station control device according to another aspect of the present invention is a base station control device that receives channel information of a terminal device via a base station, and a communication disabling detection unit that detects disabling communication with the base station, Based on the channel information received from a base station that is not incapable of communication, an operation mode determination unit that determines whether the base station incapable of communication has switched to a single operation mode that operates using a fixed channel, and a base station that has switched to the single operation mode A channel restriction unit that restricts the use of the fixed channel by the base station.

  A base station according to still another aspect of the present invention includes: a channel setting unit that sets a fixed channel used in the single operation mode; a communication impossibility detecting unit that detects communication impossibility with the base station control device; and the base station control device A channel control unit that instructs a terminal device to switch to a single operation mode that operates using the fixed channel when communication with the base station is not possible. When communication with the other base station becomes impossible, the terminal device is instructed to restrict use of a fixed channel used in the single operation mode of the other base station.

  The terminal device according to still another aspect of the present invention includes a channel setting unit that switches to a fixed channel in the single operation mode when receiving a switch signal to the single operation mode from the base station, and a single operation when the switch signal is received from the base station. A display unit for displaying that the mode is set, and the channel setting unit cancels channel fixation on the fixed channel when receiving a use restriction instruction for the fixed channel from a base station other than the base station. .

  According to still another aspect of the present invention, there is provided a base station control method that detects communication failure of an approach line with a plurality of base stations, receives channel information from a terminal device, and performs communication failure based on the channel information. It is determined whether the base station has switched to the single operation mode operated by the fixed channel, and the base station other than the base station switched to the single operation mode is restricted from using the fixed channel.

  According to the above aspect of the present invention, when a line connecting a base station is disconnected, interference in a communication area overlapping with another base station can be avoided even if the base station switches to single operation.

FIG. 1 is a diagram showing a schematic configuration of the first embodiment. FIG. 2 is a block diagram showing the configuration of the first embodiment. FIG. 3 is a flowchart illustrating an operation of switching the single operation mode according to the first embodiment. FIG. 4 is a flowchart illustrating an operation of interference avoidance control according to the first embodiment. FIG. 5 is a diagram showing a schematic configuration of the second embodiment. FIG. 6 is a block diagram illustrating a configuration of the second embodiment. FIG. 7 is a diagram illustrating the operation of the line control apparatus according to the second embodiment. FIG. 8 is a diagram illustrating an operation of interference avoidance control according to the second embodiment. FIG. 9 is a flowchart illustrating an operation of interference avoidance control according to the second embodiment. FIG. 10 is a diagram illustrating a communication operation of a terminal apparatus in an area where the communication areas of the base station switched to the single operation mode and other base stations overlap. FIG. 11 is a block diagram illustrating a configuration of a modification of the second embodiment. FIG. 12 is a diagram illustrating a communication operation between the terminal device outside the communication area of the base station in the single operation mode in FIG. 11 and the terminal device in the communication area of the base station in the single operation mode.

  Hereinafter, the configuration of an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of the first embodiment of the present invention.

  As shown in FIG. 1, the radio system 1 includes a base station control device 2 that controls a base station, and base stations 3a, 3b, and 3c. The base stations 3a, 3b, and 3c are connected to the base station controller 2 through approach lines 4a, 4b, and 4c. The base stations 3a, 3b, and 3c have communication areas 5a, 5b, and 5c, respectively, and can wirelessly communicate with a plurality of terminal devices that exist in each communication area. As shown in FIG. 1, the communication areas 5a, 5b, and 5c of the base stations 3a, 3b, and 3c include areas that partially overlap. The communication area of the base station is an area where the electric field strength of the radio wave reaching from the terminal device to the base station is sufficiently strong. It should be noted that radio waves that reach the base station from terminal devices outside the communication area are not at all unreceivable electric field strengths and may be received.

  As shown in FIG. 1, for example, terminal devices 6a and 6ac exist in the communication area 5a, and these can perform wireless communication with the base station 3a. A terminal device 6b exists in the communication area 5b, and these can wirelessly communicate with the base station 3b. Terminal devices 6c and 6ac exist in the communication area 5c, and these can wirelessly communicate with the base station 3c. The base stations 3a, 3b, and 3c can use a channel selected from a plurality of channels, for example, CH1, CH2, and CH3, for wireless communication with the terminal devices 6a, 6b, 6c, and 6ac.

  The terminal devices 6a, 6b, 6c, and 6ac periodically transmit the terminal information of the own terminal including the device type, position information, and the like. The determined base station relays the terminal information of its own terminal including the device type, location information, etc. from the terminal devices 6a, 6b, 6c, 6ac, and transmits it to the base station control device 2.

  In addition, when the approach line becomes non-communication, the base stations 3a, 3b, and 3c of the present embodiment enable communication of terminal devices under the base station in the single operation mode. In the single operation mode, communication is performed only between the base station and the terminal device in the communication area of the base station, and since the base station cannot be connected to the base station control device 2, it communicates with the terminal device in the communication area of another base station. It is a mode that does not. In the single operation mode, the base station and the terminal device use one fixed channel. Note that the communication method in the single operation mode is limited to a method that can be performed using a fixed channel, such as simultaneous simplex communication.

  FIG. 2 is a block diagram illustrating a configuration of the wireless system 1 according to the first embodiment of this invention.

  The wireless system 1 includes a base station control device 2 and a base station 3. The base station control device 2 is connected to a plurality of base stations 3 through an approach line 4. Further, each base station 3 is connected to a plurality of terminal devices 6 existing in each communication area 5 by radio lines. Although only one block diagram of each of the base station 3 and the wireless device 6 is shown in FIG. 2, the configurations of the plurality of base stations 3 and the wireless devices 6 are the same.

  The terminal device 6 includes a terminal information generation unit 61, a channel setting unit 62, and a display unit 63. The terminal information generation unit 61 periodically transmits its own terminal information including channel information and position information to the base station control device 2. When the fixed channel used in the single operation mode is notified from the base station, the channel setting unit 62 sets the notified fixed channel as a channel used in the single operation mode. When the terminal device 6 receives the switching signal, the channel setting unit 62 switches to the fixed channel in the single operation mode. When the terminal device 6 receives the switching signal, the display unit 63 displays that it is in the single operation mode.

  When the base station 3 becomes unable to communicate with the base station control device 2 and the radio unit 31 that performs radio communication with the terminal device in the communication area of the local station, the base station 3 uses the fixed channel to the terminal device within the communication area of the local station. A control unit 32 for instructing switching to the single operation mode is provided. In addition, the control unit 32 includes a fixed channel setting unit 321, a communication failure detection unit 322, and a channel control unit 323. The fixed channel setting unit 321 notifies the terminal device 6 in the communication area 5 of the base station 3 of the fixed channel used in the single operation mode. The communication failure detection unit 322 detects whether or not communication with the base station control device 2 is disabled due to a failure of the approach line 4 or the like. Further, the communication impossibility detecting unit 322 confirms whether there is a failure in the wireless unit 31 and the control unit 32 of the local station. When there is no failure in the radio unit 31 and the channel control unit 323 of the own station when communication with the base station control device 2 is disabled, the channel control unit 323 sends all channels CH1 to the terminal device 6 in the communication area 5 of the own station. , CH2, and CH3 transmit a switching signal instructing switching to a fixed channel operation.

  The base station control device 2 includes a communication impossibility detecting unit 21, an operation mode determining unit 22, and a channel limiting unit 23. The communication failure detection unit 21 detects whether or not communication with each base station 3 is disabled due to failure of each approach line 4 or the like. The operation mode determination unit 22 acquires a fixed channel in the single operation mode of the base station 3, and when communication with a certain base station 3 is disabled, the base station 3 that is disabled from the received terminal information. Is switched to the single operation mode. When the base station 3 that cannot communicate is switched to the single operation mode, the channel restriction unit 23 restricts the use of the fixed channel of the base station that is switched to the single operation mode to the base station that can communicate. Instruct them to do so.

  FIG. 3 is a flowchart showing the operation of switching to the single operation mode of the present embodiment.

  First, the fixed channel setting unit 321 of the base station 3 sets a fixed channel used in the single operation mode (step S1). For example, the fixed channel setting unit 321 notifies the terminal device 6 in the communication area 5 of the base station 3 of the fixed channel used in the single operation mode. The channel setting unit 62 of the terminal device sets a fixed channel used in the single operation mode.

  When the communication failure detection unit 322 of the base station 3 detects that the communication with the base station control device 2 cannot be performed due to a failure of the approach line 4 or the like (step S2), the communication unit first detects the wireless unit 31 and the channel control unit 323 of its own station. It is confirmed whether or not there is a failure (step S3). The channel control unit 323 of the base station 3 switches to the single operation mode when there is no failure in the radio unit 31 and the channel control unit 323 of the own station (step S4). That is, the base station 3 transmits a switching signal instructing switching to loopback communication in the communication area 5 to the terminal device 6 in the communication area 5 of the own station using all channels CH1, CH2, and CH3.

  The terminal device 6 that has received the switching signal displays on the display unit 63 that it is in the single operation mode, and the channel setting unit 62 switches to the fixed channel in the single operation mode preset in step S1 (step S5). Note that after the base station is set to a predetermined fixed channel, the terminal device 6 may be set to a fixed channel by using a channel scan function when out of service.

  As a result, the terminal device 6 in the communication area 5 of the base station 3 that has become unable to communicate with the base station control device 2 without the user operating the terminal device 6 is returned via the base station 3 in the communication area 5. Communication is possible.

  Furthermore, the base station control device 2 of the present embodiment interferes with the communication in the communication area 5 of the base station 3 that has been switched to the single operation mode and the communication in the communication area 5 of the other base station 3. The base station 3 is controlled to avoid this. FIG. 4 is a flowchart showing the operation of interference avoidance control according to this embodiment.

  First, the communication failure detection unit 21 of the base station control device 2 confirms that, for example, the approach line 4c of the wireless system 1 of FIG. 1 is not communicating, and the base station 3c and the base station control device 2 are disabled to communicate. It detects (step S11).

  On the other hand, the terminal information generation unit 61 of the terminal device 6 periodically transmits its own terminal information including channel information and position information to the base station control device 2 (step S12). The wireless unit 31 of the other base station 3a receives the terminal information of the terminal device 6ac in the area where the communication area 5c of the base station 3c where the approach line has become non-communication and the communication area of the other base stations 3a and 3b overlap. Then, it transmits to the base station control device 2 (step S13). The base station controller 2 receives the terminal information transmitted by the base station 3a (step S14).

  The operation mode determination unit 22 of the base station control device 2 determines from the received terminal information whether the base station 3c that cannot communicate is operating in the single operation mode (step S15). For this reason, for example, the operation mode determination unit 22 of the base station control device 2 acquires a fixed channel in the single operation mode of the base stations 3a, 3b, and 3c. The operation mode determination unit 22 determines from the position information included in the terminal information whether the transmission source terminal device 6 is present in the communication area 5c of the base station 3c that cannot communicate. If the transmission source terminal device 6 exists in the communication area 5c and the channel information in the terminal information is a fixed channel of the base station 3c, it is determined that the base station 3c that cannot communicate has switched to the single operation mode. As good as

  When it is determined that the base station 3c that cannot communicate is operating in the single operation mode, the channel restriction unit 23 of the base station control device 2 determines the single operation mode for the communicable base stations 3a and 3b. Is instructed to limit the use of the fixed channel of the base station 3c that has been switched to (step S16).

  The channel control unit 323 of the base stations 3a and 3b that can communicate with the base station control device 2 uses the fixed channel of the base station 3c switched to the single operation mode for the terminal devices 6 in the communication areas 5a and 5b of the local station. Instruct to not (step S17).

  The channel setting unit 62 of the terminal device 6 in the communication areas 5a and 5b of the base stations 3a and 3b that can communicate with the base station control device 2 is fixing the channel according to the instruction from the base station 3c switched to the single operation mode. It is determined whether or not there is (step S18). Otherwise, restrict the use of the channel for single operation mode. In other words, the terminal device 6 in the communication areas 5a and 5b of the base stations 3a and 3b, whose channel is not fixed by an instruction from the base station 3c switched to the single operation mode, is a channel whose use is restricted by the base stations 3a and 3b. Communication is performed using a channel other than (step S19). If the channel setting unit 62 is fixing the channel according to the instruction from the base station 3c switched to the single operation mode, the channel setting unit 62 releases the specified communication channel fixing and selects the specified fixed channel or any other channel. It becomes possible (step S20).

  As described above, according to the present embodiment, in the case of disconnection of the approach line between the base station controller and the base station, the base station 3 switches to loopback communication within the communication area. With such a configuration, it is possible to prevent the terminal device in the communication area of the base station from becoming completely incapable of communication due to disconnection of the approach line between the line control device and the base station that is assumed in a large-scale disaster or the like. That is, even if the approach line is disconnected, if the base station can operate, it can be switched to single operation, and communication within the communication area of the base station can be made possible.

  In addition, the use of the fixed channel set in the single operation mode is restricted for base stations other than the base station switched to the single operation mode. With such a configuration, it is possible to avoid interference between the communication in the communication area of the base station switched to the single operation mode and the communication in the communication area of another base station.

  Next, a second embodiment of the present invention will be described. FIG. 5 is a diagram showing a schematic configuration of the second embodiment of the present invention.

  As shown in FIG. 5, the wireless system 11 of this embodiment includes a line control device 12, a management / monitoring device 13, and a command device 14 instead of the base station control device 2 of the first embodiment. And the terminal device 7 includes a field intensity information transmission unit 71.

  FIG. 6 is a block diagram illustrating a configuration of the wireless system 11 according to the second embodiment of this invention.

  The base station 3 and the wireless system 11 are the same as those in the first embodiment. The configuration of the management monitoring device 13 is the same as that of the base station control device 2 of the first embodiment. The management monitoring device 13 is connected to a plurality of base stations 3 through an approach line 4 via the line control device 12. Each base station 3 is connected to a plurality of terminal devices 7 existing in each communication area 5 by radio lines. As in the first embodiment, FIG. 6 shows only one block diagram of each of the base station 3 and the radio apparatus 7, but the configurations of the plurality of base stations 3 and radio apparatuses 6 are the same.

  The terminal device 7 includes a terminal information generation unit 61, a channel setting unit 62, a display unit 63, and an electric field strength information transmission unit 71. The terminal information generation unit 61 periodically transmits its own terminal information including channel information and position information to the management monitoring device 13 via the line control device 12. When the fixed channel used in the single operation mode is notified from the base station, the channel setting unit 62 sets the notified fixed channel as a channel used in the single operation mode. When the terminal device 7 receives the switching signal, the channel setting unit 62 switches to the fixed channel in the single operation mode. When the terminal device 7 receives the switching signal, the display unit 63 displays that it is in the single operation mode. The electric field strength information transmitting unit 71 generates information on the received electric field strength from each base station 3 and transmits it to each base station 3.

  The base station 3 includes a radio unit 31 and a control unit 32. The radio unit 31 transmits the received electric field strength information received from the terminal device 7 to the line control device 12. In addition, the control unit 32 includes a fixed channel setting unit 321, a communication failure detection unit 322, and a channel control unit 323. The fixed channel setting unit 321 notifies the terminal device 7 in the communication area 5 of the base station 3 of the fixed channel used in the single operation mode. The communication failure detection unit 322 detects whether communication with the line control device 12 has become impossible due to a failure of the approach line 4 or the like. Further, the communication impossibility detecting unit 322 confirms whether there is a failure in the radio unit 31 and the channel control unit 323 of the own station. The channel control unit 323 switches to the single operation mode when there is no failure in the radio unit 31 and the channel control unit 323 of the local station when communication with the line control device 12 is disabled. That is, a switching signal for instructing switching to the loopback communication within the communication area is transmitted to the terminal device 7 within the communication area 5 of the own station through all the channels CH1, CH2, and CH3.

  The line control device 12 includes a base station determination unit 121 and a relay unit 122. The base station determination unit 121 determines the base station that has the strongest electric field based on the information on the received electric field strength from each base station 3 received from the terminal device 7, and the terminal device 7 and the management monitoring device are determined as the determined base stations. 13 and the command device 14 are instructed to be relayed.

  The management monitoring device 13 includes a communication failure detection unit 21, an operation mode determination unit 22, and a channel restriction unit 23. The communication failure detection unit 21 detects whether or not communication with each base station 3 is disabled due to failure of each approach line 4 or the like. The operation mode determination unit 22 acquires a fixed channel in the single operation mode of the base station 3, and when communication with a certain base station 3 is disabled, the base station 3 that is disabled from the received terminal information. Is switched to the single operation mode. When the base station 3 that cannot communicate is switched to the single operation mode, the channel restriction unit 23 restricts the use of the fixed channel of the base station that is switched to the single operation mode to the base station that can communicate. Instruct them to do so.

  FIG. 7 is a diagram illustrating the operation of the line control device 12 of the present embodiment.

  The field strength information transmitter 71 of the terminal devices 7a, 7b, 7c, and 7ac transmits information on the received field strength from the base stations 3a, 3b, and 3c to the line control device 12. The base station determination unit 121 of the line control device 12 determines the base station that has the strongest electric field for the terminal devices 7a, 7b, 7c, and 7ac. The base station determined by the base station determination unit 121 of the line control device 12 relays communication between the terminal devices 7a, 7b, 7c and 7ac, the management monitoring device 13 and the command device 14.

  The operation for switching to the single operation mode of the present embodiment is the same as the operation of the first embodiment.

  First, the fixed channel setting unit 321 of the base station 3 sets a fixed channel used in the single operation mode. For example, the fixed channel setting unit 321 notifies the terminal device 7 in the communication area 5 of the base station 3 of the fixed channel used in the single operation mode. The channel setting unit 62 of the terminal device sets the notified fixed channel as a fixed channel used in the single operation mode.

  When the communication failure detection unit 322 of the base station 3 detects that the communication with the line control device 12 cannot be performed due to a failure of the approach line 4 or the like, first, it checks whether there is a failure in the radio unit 31 and the channel control unit 323 of the own station. To do. When there is no failure in the radio unit 31 and the channel control unit 323 of the own station, the channel control unit 323 of the base station 3 switches to the single operation mode. That is, the base station 3 instructs the terminal device 7 in the communication area 5 of the own station to switch to the loopback communication in the communication area 5 for all channels CH1, CH2, and CH3 used in the communication area 5. A switching signal is sent.

  The terminal device 7 that has received the switching signal displays on the display unit 63 that it is in the single operation mode, and the channel setting unit 62 switches to the fixed channel in the single operation mode set in advance in step S1. Note that after the base station is set to a predetermined fixed channel, the terminal device 7 may be set to a fixed channel by using a channel scan function when out of service.

  As a result, the terminal device 7 in the communication area 5 of the base station 3 that has become unable to communicate with the line control device 12 without the user operating the terminal device 7 is returned via the base station 3 in the communication area 5. It becomes possible to do.

  The base stations 3a, 3b, and 3c set a fixed channel in the single operation mode in the communication areas 5a, 5b, and 5c. The management / monitoring device 13 acquires the fixed channel in the single operation mode of the set base stations 3a, 3b, 3c.

  Similarly to the first embodiment, the terminal devices 7a, 7b, 7c, and 7ac periodically transmit terminal information of the own terminal including the device type, location information, and the like. The base station determined by the line control device 12 relays the terminal information of its own terminal including the device type, location information, etc. from the terminal devices 7 a, 7 b, 7 c, 7 ac and transmits it to the management / monitoring device 13.

  FIG. 8 is a diagram illustrating the operation of the interference avoidance control of FIG. FIG. 9 is a flowchart showing the operation of the interference avoidance control of FIG.

  Similarly to the first embodiment, the base stations 3a, 3b, and 3c set channels in the single operation mode to the terminal devices 7a, 7b, 7c, and 7ac in the communication areas 5a, 5b, and 5c (step S1).

  The management / monitoring apparatus 13 according to the present embodiment acquires a fixed channel in the single operation mode of the base stations 3a, 3b, and 3c (step S21).

  The management / monitoring device 13 detects non-communication of the approach lines 4a, 4b, and 4c as in the first embodiment (step S11). The operations in steps S12 to S14 are the same as those in the first embodiment.

  For example, when the base station 3c becomes incapable of communication, the management / monitoring device 13 is present in the communication area 5c of the base station 3c where the transmission-source terminal device 7 is incapable of communication based on the received terminal information. It is determined whether to do so (step S22). When the transmission source terminal device 7 exists in the communication area of the base station 3c incapable of communication, the management / monitoring device 13 determines that the channel information included in the received terminal information is a base in which communication is disabled. It is determined whether it is the fixed channel CH3 in the single operation mode of the station 3c (step S23). If the management / monitoring device 13 determines that the channel included in the terminal information received from the terminal device 7 is the channel CH3 in the single operation mode of the base station 3c, the management / monitoring device 13 sets the base station 3c in communication disabled to the single operation mode. Judge that it is operating by switching. The management / monitoring device 13 instructs the communicable base stations 3a and 3b to restrict the use of the fixed channel CH3 of the base station 3c that has been switched to the single operation mode (step S16).

  As in the first embodiment, the base stations 3a and 3b that can communicate from the base station control device 2 are fixed to the base station 3c in which the terminal device 7 in the communication area of the own station is switched to the single operation mode. Instructing not to use channel CH3 (step S17).

  As in the first embodiment, the terminal device 7 in the communication area of the base stations 3a and 3b that can communicate with the base station control device 2 can receive a channel according to an instruction from the base station 3c that has been switched to the single operation mode. It is determined whether it is fixed (step S18). When the terminal device 7 is not in a fixed channel state, that is, when the terminal device 7 is outside the communication area of the base station 3c that has been switched to the single operation mode, the use of the channel CH3 for the single operation mode is restricted. Communication is performed using the channel (step S19). If the channel setting unit 62 is fixing the channel according to the instruction from the base station 3c switched to the single operation mode, the channel setting unit 62 releases the specified communication channel fixing and selects the specified fixed channel or any other channel. It becomes possible (step S20).

  FIG. 10 is a diagram illustrating a communication operation of a terminal apparatus in an area where the communication areas of the base station switched to the single operation mode and other base stations overlap. The terminal device 7ac in the area where the communication area of the base station 3c switched to the single operation mode and the other base station 3a overlap is a terminal device in the communication area 5c of the base station 3c switched to the single operation mode. Once fixed to the fixed channel CH3 according to the instruction of the base station 3c. In this state, when a channel use restriction instruction is received from the base station 3a in step S17, the channel fixation is released, and the designated fixed channel CH3 and the other channels CH1 and CH2 can be selected. Therefore, as shown in FIG. 10, communication is performed with a terminal device in a communication area of a base station other than the base station in the single operation mode using channels CH1 and CH2 other than the channel instructed to be restricted.

  As described above, the radio system 11 according to the present embodiment, as in the first embodiment, communicates with the base station by disconnecting the approach line between the line control apparatus and the base station that is assumed in a large-scale disaster. It is possible to prevent the terminal devices in the area from being completely unable to communicate. That is, even if the approach line is disconnected, if the base station can operate, it can be switched to single operation, and communication within the communication area of the base station can be made possible. In addition, the use of the fixed channel set in the single operation mode is restricted for base stations other than the base station switched to the single operation mode. Interference between communication in the communication area of the base station that has been switched to the single operation mode and communication in the communication area of other base stations can be avoided.

  While the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

  For example, the operator may select a fixed channel used in a base station in a single operation mode whose use is restricted by operating the terminal device. FIG. 11 is a block diagram illustrating a configuration of a wireless system 15 according to a modification of FIG. The terminal device 8 of the present modification includes a forcible selection unit 81 that enables a fixed channel used in a base station in a single operation mode whose use is restricted by an operator operating the terminal device. ing. Other configurations are the same as those of the second embodiment. FIG. 12 is a diagram illustrating a communication operation between the terminal device outside the communication area of the base station in the single operation mode in FIG. 11 and the terminal device in the communication area of the base station in the single operation mode. It is assumed that the base station 3a instructs the terminal device 8a in its own communication area not to use the fixed channel CH3 of the base station 3c that has been switched to the single operation mode. In this case, when the operator operates the terminal device 8a, the forced selection unit 81 of the terminal device 8a selects CH3. As a result, the terminal device 8a can communicate using CH3. If the base station 3c can receive the radio wave from the terminal device 8a, the terminal station 8c in the communication area 5c of the base station 3c performs the return communication as shown in FIG. With such a configuration, it is possible to prevent a terminal device outside the communication area of the base station in the single operation mode from being able to communicate at all with the terminal device within the communication area of the base station in the single operation mode.

DESCRIPTION OF SYMBOLS 1, 11, 15 Wireless system 2 Base station control apparatus 3 Base station 4 Approach line 5 Communication area 6, 7, 8 Terminal apparatus 12 Line control apparatus 121 Base station determination part 122 Relay part 13 Management / monitoring apparatus 14 Command apparatus 21 Communication Impossibility detection part 22 Operation mode determination part 23 Channel restriction part 31 Radio part 32 Control part 321 Fixed channel setting part 322 Communication impossibility detection part 323 Channel control part 61 Terminal information generation part 62 Channel setting part 63 Display part 71 Electric field strength information transmission part 81 Forced selection part

Claims (9)

A base station that receives channel information of the terminal device;
In a wireless system having a base station controller connected to the base station,
When the base station is unable to communicate with the base station controller, its own communication channel is a fixed channel,
The base station controller restricts the use of the fixed channel to a base station other than the base station having the communication channel of the local station as a fixed channel.
Wireless system. In the base station controller that receives the channel information of the terminal device via the base station,
A communication inability detecting unit for detecting inability to communicate with the base station;
An operation mode determination unit that determines whether the base station incapable of communication is switched to a single operation mode operated by a fixed channel based on the channel information received from a base station that is not incapable of communication;
A channel restriction unit that restricts the use of the fixed channel to a base station other than the base station switched to the single operation mode;
A base station control device.   The said operation mode determination part determines that it switched to the single operation mode, when the channel information received from the terminal device which exists in the communication area of the base station incapable of communication is the fixed channel. Base station controller.   4. The base station according to claim 2, wherein the operation mode determination unit determines whether a transmission source terminal device exists in a communication area of the base station incapable of communication based on position information included in the channel information. Control device. A channel setting unit for setting a fixed channel used for the single operation mode;
A communication failure detection unit that detects communication failure with the base station control device;
A channel control unit that instructs the terminal device to switch to the single operation mode operated by the fixed channel when communication with the base station control device is disabled,
The base station that instructs the terminal device to restrict the use of a fixed channel used in the single operation mode of the other base station when the other base station becomes unable to communicate with the base station control device. It has a wireless unit that performs wireless communication with terminal devices in the communication area,
The switching instruction unit, when the radio unit, the channel control unit is not out of order, the communication channel of its own station as a fixed channel,
The base station according to claim 5. A channel setting unit that switches to a fixed channel in the single operation mode when receiving a switching signal to the single operation mode from the base station;
A display unit for displaying that it is in a single operation mode when receiving the switching signal from the base station,
The channel setting unit, when receiving a fixed channel use restriction instruction from a base station other than the base station, releases the fixed channel on the fixed channel.   The terminal device according to claim 7, further comprising a forcible selection unit that enables selection of the fixed channel for which use restriction is instructed from a base station other than the base station. Detects the communication failure of the approach line between multiple base stations,
Receive channel information from the terminal device,
Based on the channel information, determine whether the non-communication base station has switched to a single operation mode operated by a fixed channel,
Limiting the use of the fixed channel to base stations other than the base station switched to the single operation mode,
Base station control method.

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