JP2007259010A - Wireless communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure a state that a mobile station device can communicate, in a wireless communication system wherein a plurality of base station devices A1 and A2 communicate by radio with the mobile station device, each using a plurality of channels for communication. <P>SOLUTION: In each base station device, a channel management means manages the use status of the plurality of channels for communication used by its own device. When it is found from management results that all the channels for communication are used by its own device, a change request transmitting means sends by radio a predetermined request to change a base station to a mobile station device accommodated by its own device. In the mobile station device, when a change request receiving means receives the request to change a base station sent by radio from the base station device wherein its own device is accommodated, an access point changing means changes an access point of its own device to other base station device in response to the reception of the request to change a base station. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a radio communication system in which a mobile station apparatus and a base station apparatus communicate with each other by radio, and more particularly to a radio communication system that ensures a communicable state of a mobile station apparatus.

For example, in a wireless communication system such as fire fighting / emergency in a municipality, a plurality of base station devices are installed in different locations, a plurality of mobile station devices are provided, and each mobile station device can communicate (for example, near ) Wirelessly communicates with a base station apparatus existing in the network, for example, to communicate voice or data between a higher-level apparatus (for example, a telephone desk) and a mobile station apparatus or between a plurality of mobile station apparatuses. It has been broken.
In the base station apparatus, wireless communication is performed with the mobile station apparatus by a multi-channel access (MCA) method using a plurality of communication channels.

FIG. 3 shows a mobile station device 21, two base station devices A21 and A22, and a telephone table 22 which is a higher-level device as an example of a wireless communication system.
With reference to FIG. 3, an example of operation when calling the mobile station device 21 from the telephone desk 22 but failing is shown.
When a call operation d21 is performed by an operator (person) at the call desk 22, the call desk 22 transmits a call signal z21 to the base station apparatus A21 to which the mobile station apparatus 21 to be called is connected. In this base station apparatus A21, all communication channels are in use b21, and a busy notification z22 is transmitted (returned) to the telephone desk 22. In response to this, the telephone desk 22 displays a call failure display d22 and ends the process. Here, the other base station apparatus A22 is in a state c21 where there is a communication channel available.
Thus, in a wireless communication system in which a plurality of communication channels are provided in each of the base station devices A21 and A22, the communication channel of the base station device A21 to which the mobile station device 21 is connected when a call is sent to the mobile station device 21. If all are in use, a busy notification (notification that the communication channel is in full use) is sent to the calling station, and this call ends with a failure.

FIG. 4 shows a mobile station device 31 and two base station devices A31 and A32 as an example of a wireless communication system.
With reference to FIG. 4, an example of operation when a call is made from the mobile station device 31 but fails will be described.
When a call operation a31 is performed by the user (person) in the mobile station device 31, the mobile station device 31 wirelessly transmits the call signal z31 to the connected base station device A31. In this base station apparatus A31, the communication channel is changed from the state b31 in which the communication channel is empty to the state b32 in which all the communication channels are in use, and the busy notification z32 is wirelessly transmitted (wireless return) to the mobile station apparatus 31. In response to this, the mobile station apparatus 31 performs a call failure display a32 and ends the process. Here, the other base station apparatus A32 is in a state c31 where there is a communication channel available.
As described above, in a wireless communication system in which a plurality of communication channels are provided in each of the base station devices A31 and A32, communication for the base station device A31 to which the mobile station device 31 is connected at the time of calling from the mobile station device 31 is performed. If all channels are in use, a busy notification (notification that the communication channel is in full use) is sent to the calling station, and this call ends with a failure.

JP 11-355239 A ARIB STD-T61, “Narrowband Digital Communication System (SCPC / FDMA)”, Japan Radio Industry Association ARIB STD-T79, "Municipal digital mobile communication system", Japan Radio Industry Association

However, in the wireless communication system as described above, if all the communication channels are in use in the base station apparatus to which the mobile station apparatus is connected, the call ends with failure. Even when there is a vacant channel, communication using this channel could not be performed. In addition, even if the telephone table or the mobile station apparatus calls again after the call failure, since the call is made to the same base station apparatus, there is a high possibility that the call will end again due to the call failure.
The present invention has been made in view of such a conventional situation, and an object of the present invention is to provide a radio communication system capable of ensuring a communicable state of a mobile station apparatus. Specifically, for example, even when all communication channels are in use in the base station apparatus to which the mobile station apparatus is connected, communication connection is enabled by using another base station apparatus.

In order to achieve the above object, in the wireless communication system according to the present invention, when each of a plurality of base station apparatuses communicates with a mobile station apparatus wirelessly using a plurality of communication channels, the following processing is performed. .
That is, in the base station apparatus, the channel management means manages the usage status of a plurality of communication channels used by the own apparatus (the base station apparatus), and the change request transmission means manages contents managed by the channel management means. Based on the above, when all the communication channels in the own apparatus are in use, a predetermined base station change request is wirelessly transmitted to the mobile station apparatus accommodated by the own apparatus.
In the mobile station apparatus, the change request receiving means receives the base station change request wirelessly transmitted from the base station apparatus in which the own apparatus (the mobile station apparatus) is accommodated, and the connection destination changing means includes the change When the request receiving means receives the base station change request, it changes the connection destination of its own device to another base station device.

  Therefore, when all the communication channels are in use in the base station apparatus to which the mobile station apparatus is connected, the base station apparatus notifies the mobile station apparatus to that effect, and the mobile station apparatus transmits another base station apparatus. For example, even when all the communication channels are in use in the base station device to which the mobile station device is connected, communication can be performed by using another base station device. The connection can be made possible, and the communicable state of the mobile station apparatus can be ensured.

Here, for example, the base station apparatus performs wireless communication while appropriately allocating a plurality of usable communication channels for communication with a group of two or more mobile station apparatuses or for communication with individual mobile station apparatuses.
Further, in the base station apparatus, as the usage status of the plurality of communication channels, the presence / absence of communication channel availability is managed, and for example, the allocation destination of each communication channel is further managed.
Further, the base station apparatus accommodates and manages mobile station apparatuses that are present in a wirelessly communicable area and are managed. In this case, the mobile station apparatus is connected to the base station apparatus.
Various signals may be used as a predetermined base station change request signal.

Further, in the mobile station device, when there is a base station device that is different from the currently connected base station device and can communicate in response to receiving the base station change request, Change the connection destination to the base station device.
In the mobile station device, when a base station change request is received, the connection destination is not necessarily changed when there is no other base station device that can be a connection destination or when it is not preferable as a connection destination. It does not have to be.
In addition, in the mobile station apparatus, when there are two or more other base station apparatuses that can be the connection destination, for example, the base station apparatus having a higher wireless communication level is set as a new connection destination. Any decision to determine may be used.

The radio communication system according to the present invention has the following configuration as an example configuration.
In other words, the change request transmission means provided in the base station device receives a call from the mobile station device for the mobile station device accommodated by the own device (the base station device) or the mobile device from the host device. When a call is made to a station apparatus, if all communication channels in the own apparatus are in use, the base station change request is wirelessly transmitted to the mobile station apparatus.

Therefore, the connection destination of the mobile station apparatus is changed to another base station apparatus when there is a call from the mobile station apparatus or when there is a call from a higher-level apparatus to the mobile station apparatus. The connection destination can be changed at a particularly necessary timing.
Here, in a call from a mobile station device, for example, a higher-level device or another mobile station device is a call target.
Also, as the host device, for example, various devices such as a telephone table that controls a plurality of base station devices may be used.

The present invention can also be realized as a method.
As an example, in the wireless communication method according to the present invention, when each of a plurality of base station devices communicates with a mobile station device wirelessly using a plurality of communication channels, the base station device performs all communication in its own device. When a communication channel is in use, a predetermined base station change request is wirelessly transmitted to the mobile station device accommodated by the own device, and the mobile station device receives the base station change request in response to the reception Is changed to another base station apparatus.
Therefore, a communicable state of the mobile station apparatus can be ensured.

  As described above, according to the present invention, when each of a plurality of base station devices communicates with a mobile station device wirelessly using a plurality of communication channels, the base station device is using all the communication channels. The base station change request is wirelessly transmitted to the mobile station apparatus accommodated in the case, and the mobile station apparatus changes the connection destination to another base station apparatus in response to receiving the base station change request. Therefore, for example, even when all the communication channels in the base station apparatus to which the mobile station apparatus is connected are in use, the mobile station apparatus can move by using the available communication channels in the other base station apparatuses. The communicable state of the station device can be ensured.

  Embodiments according to the present invention will be described with reference to the drawings.

A first embodiment of the present invention will be described.
FIG. 1 shows, as a configuration example of a wireless communication system according to an embodiment of the present invention, a mobile station device 1, two base station devices A1 and A2, and a telephone table (for example, a command device) as a higher-level device. 2).
In the base station apparatuses A1 and A2 of this example, wireless communication is performed with the mobile station apparatus 1 by a multi-channel access (MCA) method using a plurality of communication channels.

With reference to FIG. 1, an example of operation when the mobile station device 1 is called from the telephone desk 2 is shown.
When a call operation d1 is performed by an operator (person) at the call desk 2, the call desk 2 transmits a call signal z1 to the base station apparatus A1 to which the mobile station apparatus 1 to be called is connected. In this base station apparatus A1, all the communication channels are in use b1, and a busy notification z2 is transmitted (returned) to the telephone desk 2 and at the same time, a base station change request z3 is wirelessly transmitted to the mobile station apparatus 1. In response to this, the telephone desk 2 displays a call failure display d2. Here, it is assumed that another base station apparatus A2 adjacent to the base station apparatus A1 and capable of wireless communication with the mobile station apparatus 1 is in a state c1 where a communication channel is available.

In response to the reception of the base station change request z3, the mobile station apparatus 1 displays information a1 indicating that another base station is being selected (another base station apparatus is being selected) on the screen. Station selection processing (processing for selecting another base station device) a2 is started. Here, the mobile station apparatus 1 selects another base station apparatus A2 and is connected to the other base station apparatus A2 (a state in which the mobile station apparatus 1 is accommodated and managed by the other base station apparatus A2). ) Suppose a3 is reached.
After the mobile station device 1 changes the connection to another base station device A2, when the call operation d3 is performed again by the operator at the call console 2, the call console 2 receives the call signal z4 from the mobile station device 1 to be called. It transmits to the connected base station apparatus A2. In this base station apparatus A2, the communication channel is in a state c1, and the call signal z5 is wirelessly transmitted to the mobile station apparatus 1. Thereby, a call is established, and wireless communication z6 is enabled between the mobile station apparatus 1 and the base station apparatus A2.

  As described above, the wireless communication system of this example includes a plurality of base station apparatuses A1 and A2, and a plurality of communication channels are provided in each of the base station apparatuses A1 and A2, and the mobile station apparatus 1 uses the MCA scheme. When controlling the radio communication, if all the communication channels of the base station apparatus A1 that the mobile station apparatus 1 is connected to use for communication when the call to the mobile station apparatus 1 is executed are used. The mobile station apparatus 1 changes the connection to the other base station apparatus A2 in response to receiving the notification.

  Therefore, when there is no available communication channel in the base station apparatus A1 to which the mobile station apparatus 1 to be called is connected, the base station apparatus A1 notifies the mobile station apparatus 1 of the base station change request. Since the mobile station device 1 changes the connection to the other base station device A2, if there is a communication channel available in the base station device A2 to be changed, the mobile station device 1 in the next call Communication by can be executed. Thus, the idle communication channel can be used effectively, and the line connection rate can be improved.

Note that in the base station devices A1 and A2 of this example, channel management means is configured by a function of storing and managing the usage status such as availability of a plurality of communication channels used by each in a memory, for example. When all the communication channels are in use when a call is made from a higher-level device (the telephone desk 2 in this example) to the mobile station device 1, a base station change request signal is sent to the mobile station device 1. The change request transmission means is configured by the function of wireless transmission.
Further, in the mobile station apparatus 1 of this example, the change request receiving means is configured by the function of receiving the base station change request signal from the base station apparatuses A1 and A2, and the base station change request signal is received. Accordingly, the connection destination changing means is configured by the function of changing the connection destination to the other base station apparatuses A1 and A2.

A second embodiment of the present invention will be described.
FIG. 2 shows a mobile station apparatus 11 and two base station apparatuses A11 and A12 as a configuration example of a radio communication system according to an embodiment of the present invention.
In the base station apparatuses A11 and A12 of this example, wireless communication is performed with the mobile station apparatus 11 using a plurality of communication channels by the multi-channel access (MCA) method.

With reference to FIG. 2, an operation example performed in the wireless communication system of the present example will be described.
In the base station apparatus A11 to which the mobile station apparatus 11 is connected, when the communication channel changes from the state b11 where all communication channels are in use to the state b12, a request to change the base station is made to the mobile station apparatus 11 z11 is wirelessly transmitted. In response to reception of the base station change request z11, the mobile station apparatus 11 displays information a11 indicating that another base station is being selected (another base station apparatus is being selected) on the screen. Station selection processing (processing for selecting another base station device) a12 is started.

Here, it is assumed that another base station apparatus A12 adjacent to the base station apparatus A11 and capable of wireless communication with the mobile station apparatus 11 is in a state c11 in which a communication channel is available. Then, the mobile station apparatus 11 selects another base station apparatus A2 and is connected to the other base station apparatus A12 (a state accommodated and managed by the other base station apparatus A12). Suppose that it becomes a13.
After the mobile station device 11 changes the connection to another base station device A12, when a call operation a14 is performed by the user (person) in the mobile station device 11, the mobile station device 11 sends a call signal z12 to the base station device A12. Wireless transmission. In response to this, the base station apparatus A12 wirelessly transmits the call response z13 to the mobile station apparatus 11 if there is a communication channel available. As a result, a call is established, and wireless communication z14 is enabled between the mobile station apparatus 11 and the base station apparatus A12.

  As described above, the wireless communication system of this example includes a plurality of base station apparatuses A11 and A12, and a plurality of communication channels are provided in each of the base station apparatuses A11 and A12. When the wireless communication is controlled, if all the communication channels of the base station apparatus A11 are in use, this is notified to the connected mobile station apparatus 11, and the mobile station apparatus 11 receives the notification. In response to this, the connection is changed to another base station apparatus A12.

  Therefore, when there is no communication channel available in the base station device A11 to which the mobile station device 11 is connected, the base station device A11 notifies the mobile station device 11 of the base station change request, and the mobile station Since the device 11 changes the connection to the other base station device A12, if there is a communication channel available in the change-destination base station device A12, the mobile station device 11 executes communication in the next call. can do. Thus, the idle communication channel can be used effectively, and the line connection rate can be improved.

In the base station devices A11 and A12 of this example, the channel management means is configured by a function of storing and managing the use status such as the availability of a plurality of communication channels used by each in a memory, for example. The change request transmission means is configured by the function of wirelessly transmitting a base station change request signal to the mobile station apparatus 11 accommodated when all communication channels used by each become in use.
Further, in the mobile station apparatus 11 of this example, the change request receiving means is configured by the function of receiving the base station change request signal from the base station apparatuses A11 and A12, and the base station change request signal is received. Accordingly, the connection destination changing means is configured by the function of changing the connection destination to the other base station apparatuses A11 and A12.

Next, an example of a system to which the present invention can be applied will be described with reference to FIGS.
FIG. 5 shows a configuration example of a firefighting digital radio system which is an example of a disaster prevention digital radio system.
The firefighting digital wireless system of this example includes a command device (command console) 71 having an operation unit 81, a display unit 82, and a storage unit 83, a line control device (wireless line control device) 72, and a plurality of p bases. A plurality of station devices G1 to Gp, a plurality of p remote controllers H1 to Hp, and a plurality of q mobile station devices I1 to Iq are provided.
Each of the mobile station devices I1 to Iq is composed of an in-vehicle device 91 and a portable device 92, and has a table 93 on which the portable device 92 is placed.

The firefighting digital wireless system of this example can be used for regional disaster prevention in each prefecture such as Tokyo. In this example, the command device 71 and the line control device 72 are installed in the disaster prevention center, and the base station devices G1 to Gp are installed in the fire station or on the building, in the city, on the mountain, etc. The controllers H1 to Hp are installed in the fire department, and the mobile station devices I1 to Iq are installed in a vehicle such as a fire engine or an ambulance.
In each vehicle, for example, an in-vehicle device 91 and a table 93 are mounted and attached to each vehicle, and the portable device 92 can be carried by a person or placed on the table 93.
It is to be noted that a plurality of systems similar to those shown in FIG. 5 are provided, and one of the systems is operated and the other system is kept in a standby state, and the spare system is operated when the operating system fails. Therefore, it is possible to adopt a configuration in which the entire operation is continued.
Various devices such as a fixed device, a semi-fixed device, a portable device, and a portable device may be used as subordinate devices that communicate with the base station devices G1 to Gp.

The outline | summary of the operation | movement performed in the firefighting digital radio system of this example is shown.
In the command device 71, the operation unit 81 is operated by a person (commander) to input various instructions and information, and the display unit 82 displays and outputs various information to be displayed on the screen. The stored storage unit 83 stores various information to be stored.
The commander can transmit various instructions from the commanding device 71 to the subordinate devices (line control device 72, base station devices G1 to Gp, remote controllers H1 to Hp, mobile station devices I1 to Iq). In addition, the commander can view various information received by the commanding device 71 from the devices under its control on a screen display. Necessary information is stored in the storage unit 83.

The line control device 72 is connected to the command device 71 and the plurality of base station devices G1 to Gp, for example, by wire, relays communication between them, and performs various controls relating to a wireless line and the like.
Each base station apparatus G1 to Gp communicates wirelessly with mobile station apparatuses I1 to Iq existing in a communicable area (area), and is connected to each remote controller H1 to Hp connected by wire. Communicate between.
Each of the remote controllers H1 to Hp communicates with each of the base station devices G1 to Gp connected by wire, and has, for example, a function similar to that of the mobile station device, and is operated by a person (signer). Is done.
Each mobile station apparatus I1 to Iq communicates wirelessly with base station apparatuses G1 to Gp in which the mobile station apparatuses I1 to Iq are accommodated.

In FIG. 6, the structural example of the vehicle equipment 91 and the structural example of the portable apparatus 92 are shown.
The in-vehicle device 91 includes an antenna 101, a wireless unit 102, a key operation unit 103, a display unit 104, a microphone unit 105 having a microphone, a speaker unit 106 having, for example, two speakers, a memory 107, and a portable interface. 108 and a control unit 109.
The portable device 92 includes an antenna 111, a wireless unit 112, a key operation unit 113, a display unit 114, a microphone unit 115 having a microphone, a speaker unit 116 having a speaker, a memory 117, an in-vehicle interface 118, A control unit 119 is provided.
Here, the internal processing function of the in-vehicle device 91 and the internal processing function of the portable device 92 are generally the same, although there are differences such as the number of speakers being different.

  In the in-vehicle device 91, the wireless unit 102 wirelessly transmits and receives signals to and from the base station apparatuses G1 to Gp by the antenna 101, the key operation unit 103 receives a key operation from a person (user), and the display unit 104 displays information to the user on the screen, the microphone unit 105 inputs sound (sound) emitted by the user, the speaker unit 106 outputs sound (sound) to the user, and the memory 107 stores call information (ID information) that is a telephone number for calling, for example, the mobile interface 108 communicates with the in-vehicle interface 118 of the mobile device 92 by, for example, an optical signal, and the control unit 109 performs various controls. I do.

  Similarly, in the portable device 92, the wireless unit 112 wirelessly transmits and receives signals to and from the base station apparatuses G1 to Gp through the antenna 111, and the key operation unit 113 receives a key operation from a person (user). The display unit 114 displays information for the user on the screen, the microphone unit 115 inputs sound (sound) emitted by the user, and the speaker unit 116 outputs sound (sound) to the user. For example, the memory 117 stores call information (ID information) that is a telephone number to be called, and the vehicle-mounted interface 118 communicates with the portable interface 108 of the vehicle-mounted device 91 by, for example, an optical signal, and the control unit 119 Perform various controls.

Here, the same information is set as the call information (ID information) stored in the memory 107 of the in-vehicle device 91 and the call information (ID information) stored in the memory 117 of the portable device 92.
The in-vehicle device 91 and the portable device 92 can communicate between the portable interface 108 and the in-vehicle interface 118 in a state where the portable device 92 is placed on the pedestal 93. Communication is not performed between the portable interface 108 and the vehicle-mounted interface 118 in a state where the portable interface 108 is removed from the table 93 and carried.

In this example, in a state where the portable device 92 is set (placed) on the pedestal 93, the portable device 92 does not particularly function, and reception from the base station devices G1 to Gp, and base station devices G1 to Gp are performed. Transmission, key input, display output, voice input, voice output, etc. are all performed by the in-vehicle device 91.
On the other hand, in a state where the portable device 92 is detached from the pedestal 93, the portable device 92 receives from the base station devices G1 to Gp, transmits to the base station devices G1 to Gp, key input, display output, and audio. Input, audio output, and the like are all performed. In this state, the vehicle-mounted device 91 performs reception from the base station devices G1 to Gp, display output, and audio output only. That is, the same call information (ID information) is set in the in-vehicle device 91 and the portable device 92, and both can be received simultaneously, but transmission is performed one by one.

Note that the portable device 92 removed from the pedestal 93 performs wireless communication directly with the base station devices G1 to Gp without using the in-vehicle device 91. This point is considered to be different from a handset of a normal parent-child phone.
In addition, the state in which the portable device 92 is set on or removed from the table 93 is detected by the vehicle-mounted device 91 or the portable device 92, and the respective control units 109 and 119 according to the state at that time. Executable functions (or non-executable functions) are set.

The in-vehicle device 91 has two speakers. For example, when the portable device 92 is detached from the pedestal 93, the contents of a call transmitted from the base station devices G1 to Gp to the portable device 92 are all stored. The voice of the call transmitted from the portable device 92 to the base station apparatuses G1 to Gp is output from the other speaker.
As an example, mobile station devices I1 to Iq are provided in a fire engine or the like, and the fire engine or the like is at a site such as a fire, and a member goes out of the fire engine or the like with a portable device 92. When the other member is active and waits inside the fire engine or the like, the other member listens to the sound output from the in-vehicle device 91, and thereby, between the portable device 92 and the base station devices G1 to Gp. You can listen to the content of calls made at.
For example, different frequencies are used for downlink communication from the base station apparatuses G1 to Gp to the mobile station apparatuses I1 to Iq and uplink communication from the mobile station apparatuses I1 to Iq to the base station apparatuses G1 to Gp. .

  In addition, as communication between the base station devices G1 to Gp (for example, the command device 71) and the mobile station devices I1 to Iq, for example, a configuration in which press talk communication is performed may be used. A configuration in which two-way simultaneous communication such as a normal mobile phone is performed may be used, or a configuration in which communication in another mode is performed may be used. Also, information for notification is transmitted from the base station devices G1 to Gp to the mobile station devices I1 to Iq, and the mobile station devices I1 to Iq (automatically) receive the information in response to reception of the information. A configuration that outputs data can also be used.

In the case of a fire engine, for example, press talk communication is used, a group communication (for example, group communication on a business link) is performed by calling mobile station devices I1 to Iq of a plurality of fire engines from the command device 71, and this group By carrying out a press talk communication in the inside, it is possible to perform the same fire site treatment by these plural fire engines.
In the case of an ambulance, for example, communication such as a normal telephone is used, and a call can be performed by speaking (calling) and receiving.
In addition, for example, the vehicle-mounted device 91 and the portable device 92 can be provided with a function capable of performing wireless communication even at a distance between the vehicle-mounted device 91 and the portable device 92. In this case, as an example, when the portable device 92 is taken out of the vehicle in a dead zone such as in a tunnel, the in-vehicle device 91 and the portable device 92 can be used to communicate with each other using a transceiver.

Here, the configuration of the system and apparatus according to the present invention is not necessarily limited to the configuration described above, and various configurations may be used. The present invention can also be provided as, for example, a method or method for executing the processing according to the present invention, a program for realizing such a method or method, or a recording medium for recording the program. It is also possible to provide various systems and devices.
The application field of the present invention is not necessarily limited to the above-described fields, and the present invention can be applied to various fields.
In addition, as various processes performed in the system and apparatus according to the present invention, for example, the processor executes a control program stored in a ROM (Read Only Memory) in hardware resources including a processor and a memory. A controlled configuration may be used, and for example, each functional unit for executing the processing may be configured as an independent hardware circuit.
The present invention can also be understood as a computer-readable recording medium such as a floppy (registered trademark) disk or a CD (Compact Disc) -ROM storing the control program, and the program (itself). The processing according to the present invention can be performed by inputting the program from the recording medium to the computer and causing the processor to execute the program.

It is a figure which shows an example of the procedure of the process in the radio | wireless communications system which concerns on 1st Example of this invention. It is a figure which shows an example of the procedure of the process in the radio | wireless communications system which concerns on 2nd Example of this invention. It is a figure which shows an example of the procedure of the process regarding the calling and failure in a radio | wireless communications system. It is a figure which shows an example of the procedure of the process regarding the calling and failure in a radio | wireless communications system. It is a figure which shows the structural example of a firefighting digital radio system. It is a figure which shows the structural example of a vehicle equipment and a portable device.

Explanation of symbols

1, 11, 21, 31 .. mobile station device, 2, 22 .. telephone table, A1, A2, A11, A12, A21, A22, A31, A32 .. base station device,
71 .. Command device, 72 .. Line control device, 81 .. Operation unit, 82, 104, 114 .. Display unit, 83 .. Storage unit, 91 .. In-vehicle device, 92 .. Portable device, 93. Station, G1 to Gp, base station device, H1 to Hp, remote controller, I1 to Iq, mobile station device, 101, 111, antenna, 102, 112, radio unit, 103, 113, key Operation unit, 105, 115 .. Microphone unit, 106, 116 .. Speaker unit, 107, 117 .. Memory, 108 .. Portable interface, 109, 119 .. Control unit, 118 .. In-vehicle interface,

Claims (3)

In a wireless communication system in which each of a plurality of base station devices communicates wirelessly with a mobile station device using a plurality of communication channels,
The base station apparatus, channel management means for managing the usage status of a plurality of communication channels used by the own apparatus,
Change request transmitting means for wirelessly transmitting a predetermined base station change request to a mobile station apparatus accommodated by the own apparatus when all communication channels in the own apparatus are in use based on the contents managed by the channel managing means And comprising
The mobile station device receives a change request receiving means for receiving the base station change request wirelessly transmitted from a base station device in which the mobile device is accommodated,
Connection destination changing means for changing the connection destination of its own device to another base station device in response to the base station change request being received by the change request receiving means,
A wireless communication system. The wireless communication system according to claim 1, wherein
The change request transmission means provided in the base station apparatus has a call from the mobile station apparatus to a mobile station apparatus accommodated by the own apparatus or a call from a higher-level apparatus to the mobile station apparatus. Sometimes, when all communication channels in its own device are in use, the base station change request is wirelessly transmitted to the mobile station device.
A wireless communication system. In a wireless communication method in which each of a plurality of base station devices communicates wirelessly with a mobile station device using a plurality of communication channels,
The base station device wirelessly transmits a predetermined base station change request to the mobile station device accommodated by the own device when all communication channels in the own device are in use,
In response to receiving the base station change request, the mobile station device changes its connection destination to another base station device.
A wireless communication method.

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