JP5589360B2 - Information communication system, wireless transmission device, base station, portable terminal, information communication method and program - Google Patents

Information communication system, wireless transmission device, base station, portable terminal, information communication method and program Download PDF

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JP5589360B2
JP5589360B2 JP2009260922A JP2009260922A JP5589360B2 JP 5589360 B2 JP5589360 B2 JP 5589360B2 JP 2009260922 A JP2009260922 A JP 2009260922A JP 2009260922 A JP2009260922 A JP 2009260922A JP 5589360 B2 JP5589360 B2 JP 5589360B2
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communication
information
capacity
line
wireless
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JP2011109309A (en
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裕史 川島
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日本電気株式会社
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  The present invention relates to an information communication system, a wireless power transmission apparatus, a base station, a portable terminal, an information communication method, and a program for maintaining communication when line quality deteriorates.

  In information communication using radio, it is important to provide countermeasures for maintaining communication when the quality of a radio line deteriorates due to, for example, rain. As an example of such countermeasures, Patent Document 1 discloses that even if the radio wave condition is bad, by dividing and transmitting the amount of email data, the email can be reliably sent regardless of the amount of email data. Techniques that can be transmitted are disclosed.

  The technique disclosed in Patent Document 1 is an example of a countermeasure in a portable terminal. However, a wireless transmission apparatus that connects base stations also has a countermeasure when the quality of a wireless line deteriorates. That is, in the wireless transmission device, when the quality of the wireless line deteriorates, various information (such as alarm information indicating quality deterioration or information indicating the capacity of the wireless line) is exchanged between the wireless transmission devices, and communication is not interrupted. It has a function to reduce the capacity of the wireless line so that the transmitted data does not become an error.

  However, when the wireless transmission device reduces the capacity of the wireless channel by the above function, the fact that the capacity of the wireless channel has decreased cannot be transmitted to the base station and the mobile terminal connected thereto. Therefore, the user of the mobile terminal cannot recognize that the capacity of the wireless line has decreased.

  On the other hand, when the capacity of the wireless line is reduced, generally, the call is preferentially flowed and mail is not flown by QoS (Quality of Service) control. Since the user of the portable terminal cannot recognize the decrease in the capacity of the wireless line as described above, a situation can occur where many calls are made when the capacity of the wireless line is decreasing. If this happens, the capacity of the wireless line will be exceeded immediately, and the number of mobile terminals that will be disconnected will increase.

JP 2005-25406 A

  The present invention has been made in view of the above circumstances, and when the quality of the wireless line has deteriorated, by prompting the user of the mobile terminal to use the optimum communication method according to the capacity of the wireless line, It is an object of the present invention to provide an information communication system, a wireless transmission device, a base station, a portable terminal, an information communication method, and a program that can reduce the number of portable terminals that are disconnected from communication.

  In order to achieve such an object, an information communication system of the present invention is an information communication system including a wireless transmission device, a base station, and a mobile terminal, and the wireless transmission device communicates with other wireless transmission devices. A first communication unit that performs wireless communication between the first communication unit, a channel quality monitoring unit that monitors the quality of the wireless channel based on information communicated by the first communication unit, and a channel quality monitoring unit that determines the quality of the wireless channel. When deterioration is detected, the line capacity adjustment unit that adjusts the capacity of the wireless line so as not to cause an error, the first alarm information indicating that the quality of the wireless line has deteriorated, and the line capacity adjustment part are adjusted. A second communication unit that transmits line capacity information indicating the capacity of the wireless channel to the base station, wherein the base station communicates with the wireless transmission device, and a third communication The first alarm information and line capacity information received by the Select the recommended communication method based on the information aggregation and analysis section to be analyzed, the capacity of the wireless line analyzed by the information aggregation and analysis section, and the definition information in which the communication method is predefined according to the capacity of the wireless line. And a fourth communication unit for transmitting communication method information indicating the communication method selected by the communication method selection unit to the mobile terminal, and the mobile terminal performs wireless communication with the base station. A fifth communication unit, and a display unit that displays a message that prompts the user to use the recommended communication method based on the communication method information received by the fifth communication unit.

  The wireless transmission device of the present invention is provided in the information communication system of the present invention, and performs information communication in the information communication system of the present invention.

  The base station of the present invention is provided in the information communication system of the present invention, and performs information communication in the information communication system of the present invention.

  The portable terminal of the present invention is provided in the information communication system of the present invention, and performs information communication in the information communication system of the present invention.

  An information communication method of the present invention is an information communication method performed in an information communication system including a wireless transmission device, a base station, and a mobile terminal, and the wireless transmission device is connected to another wireless transmission device. The quality of the wireless line is deteriorated by monitoring the quality of the wireless line based on the information that is communicated wirelessly, and adjusting the capacity of the wireless line so that an error does not occur when the deterioration of the quality of the wireless line is detected. First alarm information indicating the fact and channel capacity information indicating the adjusted capacity of the radio channel are transmitted to the base station, and the base station receives the first alarm information received through communication with the radio transmission device, and The network capacity information is aggregated and analyzed, and the recommended communication method is selected and selected based on the analyzed wireless line capacity and the definition information in which the communication method is predefined according to the wireless line capacity. Communication method information indicating the communication method Transmitted, the mobile terminal based on the communication method information received by the communication with the base station, and displaying a prompting the use of the recommended communication method.

  The program of the present invention, as a first aspect, based on information wirelessly communicated with the wireless transmission device, when processing for monitoring the quality of the wireless line and degradation of the quality of the wireless line are detected, Processing for adjusting the capacity of the radio channel so as not to cause an error, first alarm information indicating that the quality of the radio channel has deteriorated, and channel capacity information indicating the capacity of the adjusted radio channel are transmitted to the base station. And a process of transmitting the data.

  According to a second aspect of the program of the present invention, as a second aspect, the first alarm information indicating that the quality of the wireless line has deteriorated from the wireless transmission device, and the line indicating the capacity of the wireless line adjusted so as not to cause an error A process of receiving capacity information, a process of aggregating and analyzing alarm information and line capacity information, a capacity of the analyzed radio line, and definition information in which a communication method is defined in advance according to the capacity of the radio line. Based on this, the computer is caused to execute a process of selecting a recommended communication method and a process of transmitting communication method information indicating the selected communication method to the connected mobile terminal.

  As a third aspect, the program of the present invention includes a process of receiving communication method information indicating a recommended communication method from communication with a base station, and the use of a recommended communication method based on the communication method information. It is characterized by causing a computer to execute a process of displaying a prompt message.

  According to the present invention, when the quality of the radio channel is deteriorated, the mobile terminal user is encouraged to use the optimum communication method according to the capacity of the radio channel, thereby reducing the mobile terminals that are disconnected. It becomes possible.

It is a figure which shows the structural example of the information communication system which concerns on one Embodiment of this invention. It is a block diagram which shows each the example of a structure of the wireless transmission apparatus, base station, and portable terminal based on one Embodiment of this invention. It is a sequence chart which shows the operation example of the information communication system which concerns on one Embodiment of this invention. It is a sequence chart which shows the operation example of the information communication system which concerns on one Embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments (embodiments) for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a diagram showing a configuration example of an information communication system according to an embodiment of the present invention. As shown in FIG. 1, the information communication system according to the present embodiment includes a wireless transmission device, a base station, and a mobile terminal. The wireless transmission devices are connected by wire or wirelessly. The wireless transmission device and the base station are connected by wire. The mobile terminal and the base station are connected wirelessly.

  FIG. 2 is a block diagram illustrating configuration examples of a wireless transmission device, a base station, and a mobile terminal according to an embodiment of the present invention. Hereinafter, the configuration of each of the wireless transmission device, the base station, and the mobile terminal will be described with reference to FIG.

  The wireless transmission device 1 includes a control unit 10 and a communication unit 11. The control means 10 is a means for controlling the overall operation of the wireless transmission device 1 and is realized by, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), or the like. The communication unit 11 is a unit that executes information communication in the wireless transmission device 1 and is realized by, for example, an antenna, an interface (connection port), a modem, or the like.

  The line quality monitoring unit 100 monitors the quality of the radio line based on information communicated with other radio transmission apparatuses. Examples of information exchanged with other wireless transmission devices include alarm information (first alarm information) indicating that the quality of the wireless line has deteriorated, and line capacity information indicating the capacity of the wireless line. When channel quality monitoring unit 100 receives alarm information from another wireless transmission device, or when the value indicated by the channel capacity information received from another wireless transmission device falls below a predetermined threshold value Detects degradation of wireless line quality.

  The line capacity adjustment unit 101 adjusts the capacity of the wireless line so that no error occurs when the line quality monitoring unit 101 detects deterioration of the quality of the wireless line. That is, the line capacity adjustment unit 101 reduces the capacity of the wireless line so that communication is not interrupted, so that information to be transmitted does not cause an error.

  As described above, when the quality of the wireless line is deteriorated due to, for example, rain or the like, the line quality monitoring unit 100 and the line capacity adjusting unit 101 exchange information such as an alarm and the capacity of the wireless line between the wireless transmission devices, The function of reducing the capacity of the wireless line so that communication is not interrupted and preventing the transmitted information from causing an error is realized.

  Although not shown, the control means 10 also includes a QoS control unit that performs QoS (Quality of Service) control for controlling a plurality of communication methods in priority order. For example, when the capacity of a wireless line is reduced, control is performed so that a call is preferentially sent over electronic mail.

  The base station communication unit 110 transmits and receives information to and from the wireless transmission device communication unit 211 of the base station 2 by wire or wireless. In this embodiment, the base station communication unit 110, when the channel capacity adjustment unit 101 adjusts the capacity of the radio channel, transmits the alarm information and the channel capacity information indicating the adjusted radio channel capacity to the base station. 2 to the wireless transmission device communication unit 211.

  The wireless transmission device communication unit 111 performs wireless transmission and reception of information with other wireless transmission devices. In the present embodiment, alarm information, line capacity information, and the like transmitted from other wireless transmission devices are received.

  The base station 2 includes control means 20 and communication means 21. The control means 20 is a means for controlling the operation of the entire base station 2, and is realized by, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory) and the like. The communication means 21 is means for executing information communication in the base station 2 and is realized by, for example, an antenna, an interface (connection port), a modem or the like.

  The information aggregation / analysis unit 200 aggregates and analyzes alarm information and line capacity information received from the wireless transmission device 1. The content to be analyzed includes the type of alarm and the value of the capacity of the wireless line.

  When the alarm information indicates deterioration of the quality of the wireless channel as a result of the analysis by the information aggregation analysis unit 200, the communication method selection unit 201 determines the capacity of the wireless line indicated by the line capacity information (adjusted by the line capacity adjustment unit 101). Capacity) and definition information defined and held in advance, a recommended communication method is selected. The definition information is information in which a recommended communication method (for example, e-mail or voice call) is determined according to the capacity of the wireless line.

  The mobile terminal communication unit 210 transmits and receives information wirelessly to and from the communication unit 31 of the mobile terminal 3. In the present embodiment, when the communication method selection unit 201 selects a communication method, the mobile terminal communication unit 210 transmits communication method information indicating the selected communication method to the communication unit 31 of the mobile terminal 3. The mobile terminal communication unit 210 transmits communication method information to all mobile terminals connected to the base station 2.

  The wireless transmission device communication unit 211 transmits and receives information to and from the wireless transmission device 1 by wireless or wired. In the present embodiment, the wireless transmission device communication unit 211 receives alarm information, line capacity information, and the like transmitted from the wireless transmission device 1.

  The mobile terminal 3 includes a control unit 30, a communication unit 31, and a display unit 32. The control means 30 is a means for controlling the operation of the entire mobile terminal 3, and is realized by, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), or the like. The communication unit 31 is a unit that performs information communication in the mobile terminal 3 and is realized by, for example, an antenna, a communication circuit, or the like. The display unit 32 is a unit for displaying various types of information to the user of the mobile terminal 3, and is realized by, for example, a liquid crystal display. Although not shown, the mobile terminal 3 naturally includes operation means (for example, a key or a button) for the user to perform various operations.

  In the portable terminal 3, the control means 30 analyzes the communication method information received from the base station 2 by the communication means 31, and displays a message prompting the user to use the recommended communication method indicated by the communication method information (for example, a message ) Is displayed on the display means 32. At this time, simultaneously with the display, the control means 30 operates a sound emitting means (for example, a speaker) (not shown), a housing vibration means (vibrator) (not shown), etc., so that the user can notice the display. May be. By visually recognizing the above display, the user can recognize that the capacity of the wireless line has decreased due to the deterioration of the quality of the wireless line, and can be aware of the use of the recommended communication method.

  Next, the operation of the information communication system of the present embodiment configured as described above (the operations of the wireless transmission device 1, the base station 2, and the mobile terminal 3 of the present embodiment) will be described in detail with reference to FIG. explain.

  In the wireless transmission device 1, the line quality monitoring unit 100 monitors the quality of the wireless line based on alarm information (first alarm information) and line capacity information communicated with other wireless transmission devices ( Step S1).

  In the wireless transmission device 1, the line capacity adjusting unit 101 adjusts the capacity of the wireless line so that no error occurs when the quality of the wireless line is detected by the line quality monitoring unit 101 (step S2). Here, the line capacity adjustment unit 101 reduces the capacity of the wireless line so that communication is not interrupted.

  In the wireless transmission device 1, when the channel capacity adjustment unit 101 adjusts the capacity of the radio channel, the base station communication unit 110 bases alarm information and channel capacity information indicating the adjusted radio channel capacity on the base. Transmit to the wireless transmission device communication unit 211 of the station 2.

  In the base station 2, the wireless transmission device communication unit 211 receives alarm information and line capacity information transmitted from the wireless transmission device 1 (step S4).

  In the base station 2, the information aggregation analysis unit 200 analyzes the contents indicated by the alarm information and the line capacity information received from the wireless transmission device 1 (step S5).

  In the base station 2, if the alarm information indicates deterioration of the quality of the radio channel as a result of the analysis by the information aggregation analysis unit 200, the communication method selection unit 201 determines the radio channel capacity (line capacity adjustment unit) indicated by the channel capacity information. The recommended communication method is selected on the basis of the capacity adjusted in 101) and the definition information defined and held in advance (step S6). Here, as an example, it is assumed that an e-mail is selected.

  In the base station 2, when the communication method selection unit 201 selects the communication method, the mobile terminal communication unit 210 sends communication method information indicating that the recommended communication method is e-mail to the base station 2. It transmits to the communication means 31 of all the portable terminals 3 currently connected (step S7).

  In the portable terminal 3, the communication means 31 receives the communication method information transmitted from the base station 2 (step S8).

  In the portable terminal 3, the control means 30 analyzes the content of the communication method information received from the base station 2, and causes the display means 32 to display a message prompting the user to use e-mail as the recommended communication method ( Step S9). At this time, if the setting is made such that the call is not sent by the QoS control, there is a possibility that the call cannot be made in case of emergency.

  As described above, according to the present embodiment, when the quality of the radio channel deteriorates, the base station transmits the alarm and the radio channel capacity not only between the radio transmission apparatuses but also to the base station, so that the base station has the radio channel capacity. Recognize that the number of devices has decreased (communication interruption may occur). Thereafter, the base station notifies all the mobile terminals (users) to use e-mail instead of calling in order to reduce the situation where the mobile terminal connected to the mobile station is disconnected. In this way, the user of the portable terminal can be prompted to use e-mail. Therefore, even if the capacity of the wireless line is reduced, if the line occupation time can be reduced, packet data such as mail is not discarded by the base station by QoS control, and the number of mobile terminals that can communicate is increased. it can.

  In other words, according to the present embodiment, when the quality of the wireless line is deteriorated, the mobile terminal that is disconnected due to prompting the user of the mobile terminal to use the optimal communication method according to the capacity of the wireless line Can be reduced.

  Next, another embodiment of the present invention will be described. The present embodiment is characterized by the operation of the base station when there is a request for streaming data from the mobile terminal. Since the configurations of the base station and the mobile terminal in the present embodiment are the same as those shown in FIG. 2, description thereof is omitted here. With reference to FIG. 4, the operation of the information communication system in this embodiment (the operation of the base station and mobile terminal in this embodiment) will be described.

  In the portable terminal 3, the communication means 31 transmits a request for streaming data to the base station 2 (step S11).

  In the base station 2, the mobile terminal communication unit 210 receives the streaming data request transmitted from the mobile terminal 3 (step S12).

  In the base station 2, the information aggregation / analysis unit 200 analyzes the aggregated line capacity information and determines whether there is a possibility of communication interruption (step S13). For example, the information aggregation analysis unit 200 determines that there is a possibility of communication interruption when the capacity indicated by the line capacity information falls below a predetermined threshold.

  In the base station 2, if there is a possibility that the communication will be interrupted as a result of the determination, the mobile terminal communication unit 210 will send the alarm information (second alarm information) indicating that the communication may be interrupted to the streaming data. Is transmitted to the portable terminal 3 which is the request source (step S14).

  In the portable terminal 3, the communication means 31 receives the alarm information from the base station 2, and the control means 30 analyzes the content of the alarm information and displays a message on the display means 32 that there is a possibility of communication disconnection. It is displayed (step S15).

  As described above, according to the present embodiment, when the user requests streaming data from the mobile terminal, it is determined whether or not there is a possibility of communication interruption before distribution of streaming data is started. Can know.

  As mentioned above, although embodiment of this invention was described, it is not limited to the said embodiment, A various deformation | transformation is possible in the range which does not deviate from the summary.

  For example, the operation in the above-described embodiment can be executed by hardware, software, or a combined configuration of both.

  When executing processing by software, a program in which a processing sequence is recorded may be installed and executed in a memory in a computer incorporated in dedicated hardware. Or you may install and run a program in the general purpose computer which can perform various processes.

  For example, the program can be recorded in advance on a hard disk or a ROM (Read Only Memory) as a recording medium. Alternatively, the program is temporarily or permanently stored on a removable recording medium such as a CD-ROM (Compact Disc Read Only Memory), an MO (Magneto optical) disc, a DVD (Digital Versatile Disc), a magnetic disc, or a semiconductor memory. It can be stored (recorded). Such a removable recording medium can be provided as so-called package software.

  The program may be wirelessly transferred from the download site to the computer in addition to being installed on the computer from the removable recording medium as described above. Or you may wire-transfer to a computer via networks, such as LAN (Local Area Network) and the internet. The computer can receive the transferred program and install it on a recording medium such as a built-in hard disk.

  In addition to being executed in time series in accordance with the processing operations described in the above embodiment, the processing capability of the apparatus that executes the processing, or a configuration to execute in parallel or individually as necessary Is also possible.

DESCRIPTION OF SYMBOLS 1 Wireless transmission apparatus 2 Base station 3 Portable terminal 10 Control means 11 Communication means 20 Control means 21 Communication means 30 Control means 31 Communication means 32 Display means 100 Line quality monitoring part 101 Line capacity adjustment part 110 Base station communication part 111 Wireless transmission apparatus Communication unit 200 Information aggregation analysis unit 201 Communication method selection unit 210 Portable terminal communication unit 211 Wireless power transmission device communication unit

Claims (11)

  1. An information communication system comprising a wireless transmission device, a base station, and a mobile terminal,
    The wireless transmission device is:
    A first communication unit that performs wireless communication with another wireless transmission device;
    A line quality monitoring unit for monitoring the quality of the radio line based on information communicated in the first communication unit;
    A line capacity adjusting unit that adjusts the capacity of the radio line so that an error does not occur when deterioration of the quality of the radio line is detected by the line quality monitoring unit;
    A second communication unit for transmitting to the base station first alarm information indicating that the quality of the radio channel has deteriorated and channel capacity information indicating the capacity of the radio channel adjusted by the channel capacity adjustment unit; Have
    The base station
    A third communication unit that communicates with the wireless transmission device;
    An information aggregation and analysis unit that aggregates and analyzes the first alarm information and the line capacity information received by the third communication unit;
    A communication method selection unit that selects a recommended communication method based on the capacity of the wireless line analyzed by the information aggregation analysis unit and definition information in which a communication method is defined in advance according to the capacity of the wireless line; ,
    A fourth communication unit that transmits communication method information indicating the communication method selected by the communication method selection unit to the mobile terminal;
    The portable terminal is
    A fifth communication unit for performing wireless communication with the base station;
    An information communication system, comprising: a display unit that displays a message prompting use of the recommended communication method based on the communication method information received by the fifth communication unit.
  2.   2. The information communication system according to claim 1, wherein the definition information defines either an e-mail or a voice call as the communication method in accordance with a capacity of the wireless line.
  3. The base station
    The information communication system according to claim 1 or 2, wherein the communication method information is transmitted to all connected mobile terminals using the fourth communication unit.
  4. The base station
    When receiving a request for streaming data from the mobile terminal, the information aggregation / analysis unit is used to analyze the aggregated alarm information and the line capacity information, and communication may be interrupted due to the streaming data communication. Determine whether there is
    If there is a possibility of communication interruption, the fourth communication unit is used to send second alarm information indicating that there is a possibility of communication interruption to the mobile terminal that is the request source of the streaming data. Send
    The mobile terminal requesting the streaming data is
    Based on the second alarm information received by the fifth communication unit, the display unit is used to display that there is a possibility of communication interruption due to the streaming data communication. The information communication system according to any one of claims 1 to 3.
  5.   A wireless transmission device provided in the information communication system according to any one of claims 1 to 4 and performing the information communication according to any one of claims 1 to 4.
  6.   A base station provided in the information communication system according to any one of claims 1 to 4 and performing the information communication according to any one of claims 1 to 4.
  7.   A portable terminal provided in the information communication system according to any one of claims 1 to 4 and performing the information communication according to any one of claims 1 to 4.
  8. An information communication method performed in an information communication system including a wireless transmission device, a base station, and a mobile terminal,
    The wireless transmission device is:
    Based on information wirelessly communicated with other wireless transmission devices, monitor the quality of the wireless line,
    If degradation of the quality of the wireless line is detected, adjust the capacity of the wireless line so that no error occurs,
    Transmitting the first alarm information indicating that the quality of the wireless line has deteriorated and the line capacity information indicating the adjusted capacity of the wireless line to the base station;
    The base station
    Aggregating and analyzing the first alarm information and the line capacity information received in communication with the wireless transmission device;
    Based on the analyzed capacity of the wireless line and the definition information in which the communication method is predefined according to the capacity of the wireless line, a recommended communication method is selected,
    Transmitting communication method information indicating the selected communication method to the mobile terminal;
    The portable terminal is
    An information communication method characterized by displaying a message prompting the use of the recommended communication method based on the communication method information received in communication with the base station.
  9. Based on information wirelessly communicated with the wireless transmission device, processing for monitoring the quality of the wireless line;
    A process of adjusting the capacity of the wireless line so that an error does not occur when deterioration of the quality of the wireless line is detected;
    The first alarm information indicating that the quality of the wireless line has deteriorated and the line capacity information indicating the capacity of the adjusted wireless line are analyzed from the first alarm information and the line capacity information. A process of transmitting to the base station notifying the mobile terminal of the communication method selected based on the capacity of the wireless line ;
    A program that causes a computer to execute.
  10. The first alarm information indicating that the quality of the wireless line between the wireless transmission apparatuses has deteriorated and the line capacity information indicating the capacity of the wireless line adjusted so as not to cause an error are received from the wireless transmission apparatus. Processing,
    A process of aggregating and analyzing the alarm information and the line capacity information;
    A process of selecting a recommended communication method based on the analyzed capacity of the wireless line and definition information in which a communication method is predefined according to the capacity of the wireless line;
    Processing for transmitting communication method information indicating the selected communication method to the connected mobile terminal;
    A program that causes a computer to execute.
  11. It is selected based on the capacity of the radio line analyzed from the first alarm information indicating that the quality of the radio line between the radio transmission apparatuses has deteriorated and the line capacity information indicating the adjusted capacity of the radio line. communication method information indicating a communication method and a process of receiving from the base station has,
    A process of displaying a message prompting the use of the selected communication method based on the communication method information;
    A program that causes a computer to execute.
JP2009260922A 2009-11-16 2009-11-16 Information communication system, wireless transmission device, base station, portable terminal, information communication method and program Expired - Fee Related JP5589360B2 (en)

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JP3888178B2 (en) * 2002-02-21 2007-02-28 セイコーエプソン株式会社 Communication channel switching control in wireless communication
JP3789374B2 (en) * 2002-03-22 2006-06-21 Necインフロンティア株式会社 Telephone system
JP3889331B2 (en) * 2002-07-26 2007-03-07 Kddi株式会社 Congestion control system, congestion control method, congestion control program, and portable terminal
JP4278530B2 (en) * 2004-02-13 2009-06-17 富士通株式会社 Code division multiplexing communication system and frequency allocation method thereof
JP2006270910A (en) * 2005-02-22 2006-10-05 Mitsubishi Electric Corp Software wireless mobile telephone communications system and software wireless mobile telephone terminal
JP2007043478A (en) * 2005-08-03 2007-02-15 Toshiba Corp Wireless device
JP4479652B2 (en) * 2005-12-20 2010-06-09 パナソニック電工株式会社 Emergency call system and emergency call terminal and center device used therefor
JP2008109595A (en) * 2006-10-27 2008-05-08 Nec Corp Automatic speech method switching system, server, method, and program

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