JP2006020132A - Communication terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication terminal capable of performing emergency report in a common channel. <P>SOLUTION: A communication terminal 10 transmits information to an emergency reporting destination device to which the information is addressed, and which is connected to a communication network through an individual channel or common channel. It comprises a switching judging part 14 which selects whether to use an individual channel or common channel for transmitting information to the emergency reporting destination device, an emergency information adder 15 which generates information for transmitting information to the emergency reporting destination device using a channel selected by the switching judging part 14, and a communication processor 17 which transmits the information generated by the emergency information adder 15 to a base station device which controls assigning of common channel or individual channel within the communication network. The communication processor 17 transmits information to the emergency reporting destination device through a common channel or individual channel which is assigned by the base station device. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a communication terminal that transmits an emergency call in a mobile communication system.

  In recent years, mobile wireless terminals such as mobile phones have been widely used. The amount of information that can be handled in a mobile communication network connected to a wireless terminal is limited to a predetermined amount, and it is necessary to efficiently transmit and receive information in the mobile communication network. In communication by a wireless terminal in an emergency such as a disaster, it is desired to establish the communication with priority. For wireless terminals that make emergency calls (emergency calls), it is necessary to preferentially secure a communication channel in the mobile communication network and perform communication in the mobile communication network with priority over other wireless terminals. There is.

  For example, in the 3GPP (Third Generation Partnership Project) standard, an emergency call parameter is included in a control message (RRC connection request message) for setting an RRC connection, and is transmitted to the network. The network implements an emergency call by circuit switching by preferentially assigning an individual channel to the wireless terminal that has transmitted the emergency call.

  However, if most of the communication by the wireless terminal in the mobile communication network is an important communication or an emergency call and there is no free resource for the wireless individual channel, the individual channel for the wireless terminal that has newly transmitted the emergency call Cannot be assigned.

  In the emergency call connection processing system described in Patent Document 1, the mobile station uses the call channel assigned by the base station, and the communication processing means of the mobile station performs call processing with the other party. When the base station detects the emergency call information indicating that the call is an emergency call from the channel assignment request from the mobile station, the base station sends a channel switch request for responding to the emergency call to one of the mobile stations in a call. Yes. Then, the base station assigns the call channel released in response to the channel switching request to the call request including the emergency call information. When the mobile station determines that the input dial number is an emergency number to which an emergency call is to be applied, the mobile station transmits an emergency call information indicating that the call is an emergency call to the channel assignment request. When the mobile station detects emergency switching information from the channel switching request received from the base station, the mobile station makes a re-call to a base station other than the currently used base station.

Japanese Patent Laid-Open No. 10-13927

  However, according to the above-described conventional technology, the mobile station sends emergency call information to the base station after establishing the control channel, and therefore cannot send emergency call information to the base station when the control channel cannot be established. There was a problem.

  The present invention has been made in view of the above, and an object of the present invention is to obtain a communication terminal capable of making an emergency call even when an individual physical channel cannot be established with a network. .

  In order to solve the above-described problems and achieve the object, the present invention provides information connected to a communication network through an individual channel assigned to each communication device or a common channel sharing a radio frame with a plurality of communication devices. In a communication terminal that transmits information to an information transmission destination device that is a transmission destination of the channel, a channel selection unit that selects whether the information to be transmitted to the information transmission destination device is performed by the dedicated channel or the common channel, and the channel A connection information creation unit that creates a request for transmitting information to the information transmission destination device on the channel selected by the selection unit as connection request information, and the connection request information created by the connection information creation unit, A communication unit that transmits to a base station apparatus that performs common channel or dedicated channel allocation control within a communication network, and Communication unit, and transmits the information to the destination device via a common channel or a dedicated channel assigned by the base station apparatus.

  According to the present invention, since information is transmitted to the information transmission destination device through the dedicated channel or the common channel, information can be transmitted to the information transmission destination device through the common channel even when the dedicated channel cannot be used. It becomes.

  According to the present invention, even when an individual channel cannot be used, it is possible to transmit information to the information transmission destination device through the common channel without releasing the used individual channel. Therefore, even when the dedicated channel cannot be used, it is possible to quickly transmit information to the information transmission destination device.

  Embodiments of a communication terminal (communication terminal apparatus) according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment FIG. 1 is a diagram for explaining a configuration of a communication network according to an embodiment of the present invention. The communication network includes a communication terminal 10, a RAN (Radio Access Network) 20 having a wireless base station function, a CN (Core Network) 30 having a switching function, a telephone network 40, the Internet 50, an emergency call destination device (information transmission destination) Device) 60.

  In the present embodiment, a communication scheme such as CDMA (Code Division Multiple Access) is used between the radio base station (BTS 21 described later) and the communication terminal 10. In CDMA, communication between a radio base station and the communication terminal 10 is performed using a common channel or a dedicated channel. A common channel is a channel used by a plurality of communication terminals 10 competing, and an individual channel is a channel that is occupied and used (assigned) for each communication terminal 10. These common channels and dedicated channels are used after being adaptively switched. Here, the RAN 20 and the CN 30 perform processing such as setting of an individual channel and setting of a common channel with the communication terminal 10 in response to a request from the communication terminal 10.

  The communication terminal 10 is a terminal that performs movable wireless communication standardized by 3GPP (Third Generation Partnership Project) or the like. The communication terminal 10 is connected to the RAN 20 or the like and transmits / receives information.

  The RAN 20 is a wireless network that is located between the communication terminal 10 and the CN 30 and connects the communication terminal 10 and the CN 30. The RAN 20 includes a BTS (Base Transceiver Station) 21 that is a radio base station apparatus and an RNC (Radio Network Controller) 22 that is a radio network control apparatus.

  The BTS 21 includes a function for controlling a communication line with the communication terminal 10 and a control line. The BTS 21 transmits a radio signal from the communication terminal 10 to the RNC 22 that manages the plurality of BTSs 21. The RNC 22 is connected to the BTS 21 and performs line connection control of a wireless line. The RNC 22 transmits a radio signal from the BTS 21 to the CN 30.

  The CN 30 is a network (public network) that connects the telephone network 40 and the Internet 50 to the RAN 20. The CN 30 performs call control related to the communication terminal 10. The CN 30 includes an MSC / VLR (Mobile Switching Center) / (Visiting Location Register) 31, a GMSC (Gateway Mobile Switching Center) 32, an SGSN (Serving GPRS Support System) 33, and a GGSN (Gateway GPRS Switching Node) 34. The

  The MSC / VLR 31 has an MSC function and a VLR function. An MSC (Mobile Communication Control Station (Mobile Communication Exchange)) controls call connection and service in order to provide a mobile communication service. The VLR inquires the authentication information and the like of the communication terminal with respect to the subscriber (user of the communication terminal 10) database of the visitor network.

  The GMSC (mobile communication switching center) 32 is a gateway exchange node (gateway mobile communication exchange) that performs interconnection and routing with other networks. The SGSN (packet switch) 33 manages information related to each communication terminal 10 (ID assigned to the communication terminal 10, ID of the base station, communication state, etc.). Packets from the RAN 20 are sent to the GGSN 34 via the SGSN 33. The SGSN 33 performs connection control for a connection destination device. The GGSN (packet switch) 34 is a gateway for connecting to the telephone network 40 and the Internet 50. The GGSN 34 performs access control with the Internet 50 and the like. Packets from the SGSN 33 are sent to the telephone network 40 and the Internet 50 via the GGSN 34.

  The telephone network 40 includes a PLMN (Public Land Mobile Network) having a function of a mobile telephone network, a PSTN (Public Switched Telephone Network) having a function of a fixed telephone network, and the like. The PLMN is a mobile communication dedicated network (public land mobile network) such as a mobile phone. PSTN is a public telephone exchange network (fixed telephone network) for analog telephone lines. The Internet 50 connects the CN 30 and the emergency call destination device 60. The emergency call destination device 60 is a communication device installed in a police station, a fire department, or the like, and receives an emergency call or the like from the communication terminal 10.

  FIG. 2 is a block diagram showing the configuration of the communication terminal. The communication terminal 10 is a terminal that performs information communication such as a mobile phone or a PHS (Personal Handyphone System). The communication terminal 10 makes an emergency call (transmission of emergency call information) to the emergency call destination device 60 in an emergency. The communication terminal 10 includes a communication IF unit 11, an output unit 12, an input unit 13, a switching determination unit (channel selection unit) 14, an emergency information addition unit (connection information creation unit) 15, an emergency signal determination unit 16, a communication processing unit ( (Communication unit) 17, data creation unit 18, storage unit 25, and control unit 19.

  The communication IF unit 11 is a communication interface that communicates with the emergency call destination device 60 via the RAN 20, the CN 30, and the like. The output unit 12 outputs information including characters, voices, and the like. The output unit 12 includes a liquid crystal panel, a speaker, and the like. The output unit 12 displays character information on a liquid crystal panel or the like as information output, and outputs sound information on a speaker or the like.

  The input unit 13 includes a numeric keypad, a mouse, a keyboard, and the like, and inputs information from the user of the communication terminal 10. The input unit 13 inputs a dial number for connecting to the emergency call destination device 60 that is a communication destination and information (message) to be transmitted to the emergency call destination device 60. The storage unit 25 stores a dial number of the emergency call destination device 60, information (message) to be transmitted to the emergency call destination device 60 created in advance, and the like.

  The emergency signal determination unit 16 determines whether or not the dial number input to the input unit 13 is a dial number corresponding to the emergency call destination device 60 (for connection to the emergency call destination device 60) (number for emergency call). Is determined. The emergency signal determination unit 16 is input based on whether the dial number of the emergency call destination device 60 stored in the storage unit 25 matches the dial number of the emergency call destination device 60 input to the input unit 13. It is determined whether or not the dial number is an emergency call number.

  When making an emergency call to the emergency call destination device 60, the switching determination unit 14 determines whether to make an emergency call through an individual channel or to make an emergency call through a common channel. When the emergency signal determination unit 16 determines that the emergency call dial number is input to the input unit 13, the switching determination unit 14 determines that an individual channel is selected to make an emergency call. In addition, the switching determination unit 14 detects this information when receiving information from the RAN 20 (BTS 21) indicating that the allocation of the dedicated channel has failed. When the switching determination unit 14 detects information indicating that the allocation of the dedicated channel has failed, it determines that the common channel is selected and an emergency call is made. The switching determination unit 14 transmits to the emergency information adding unit 15 a determination result as to whether an emergency call is to be made by using an individual channel or a common channel.

  When making an emergency call to the emergency call destination device 60, the emergency information addition unit 15 adds emergency information indicating that the call is an emergency call (emergency call) to the channel assignment request. Based on the channel determination result transmitted from the switching determination unit 14, the emergency information adding unit 15 requests either the allocation of the individual channel or the allocation of the common channel to the channel allocation request when making an emergency call. Information indicating that the above is added.

  The communication processing unit 17 communicates with the RAN 20 through a common channel such as a RACH (Random Access Channel) described later or an individual channel such as a DPCH (Dedicated Physical Channel). The communication processing unit 17 transmits a connection request with the emergency call destination device 60 when making an emergency call. The communication processing unit 17 transmits information (message) related to the emergency call to the emergency call destination device 60.

  The data creation unit 18 creates message data for emergency call when making an emergency call through the common channel. The control unit 19 controls the communication IF unit 11, the output unit 12, the input unit 13, the switching determination unit 14, the emergency information addition unit 15, the emergency signal determination unit 16, the communication processing unit 17, the data creation unit 18, and the storage unit 25. To do.

  Next, an emergency call processing procedure by the communication terminal 10 will be described. FIG. 3 is a sequence diagram showing an emergency call processing procedure by the communication terminal. When the user of the communication terminal 10 makes an emergency call to the emergency call destination device 60, the user inputs a dial number corresponding to the emergency call destination device 60 from the input unit 13 of the communication terminal 10. For example, if the emergency call destination device 60 is a police station, 110 is entered as the dial number.

  In the communication terminal 10, processing settings relating to emergency notification are performed in advance. Here, the emergency call setting will be described. The emergency call is set by the communication terminal 10 by displaying a predetermined setting screen on the display screen of the output unit 12 and inputting predetermined information from the input unit 13.

  FIG. 4 is a diagram illustrating an example of an emergency call setting screen. For example, “automatic transmission”, “mail transmission”, “SMS (Short Message Service) transmission”, and “transmission by voice memo” are displayed on the setting screen as emergency call settings.

  “Automatic transmission” is a setting for whether or not to make an emergency call on a common channel automatically after an emergency call on an individual channel fails. When automatic transmission is performed, packet communication or SMS communication may be used. When the emergency call using the common channel is set to be automatically performed, after the emergency call using the individual channel fails, the control unit 19 controls the communication terminal 10 to automatically make the emergency call using the common channel. On the other hand, if the emergency call through the common channel is not set to be automatically performed, after the emergency call through the individual channel fails, the communication terminal 10 uses the common channel based on the instruction information input to the input unit 13. Make an emergency call.

  “Mail transmission” is a setting for making an emergency call through a common channel based on a mail application and predetermined instruction information by a user. When making an emergency call by “mail transmission”, a still image or a moving image may be attached at the time of the emergency call. “SMS transmission” is a setting for making an emergency call through a common channel based on the SMS application and predetermined instruction information by the user. “Transmission by voice memo” is a setting for making an emergency call through a common channel based on an application for transmitting voice information and input (recording) of a predetermined voice memo by a user. When making an emergency call by “transmission by voice memo”, the emergency call is made by packet communication.

  The user selects a desired setting from these settings and inputs the selected setting from the input unit 13. The control unit 19 sets the emergency call based on the emergency call setting information input from the input unit 13.

  In addition, it is good also as a structure which transmits the still image and moving image image | photographed with the digital camera etc. instead of the voice memo. If the user operation is not set, for example, “automatic transmission” is selected as the default setting.

  When a dial number is input to the input unit 13 by the user in order to make an emergency call, the emergency signal determination unit 16 determines whether the input dial number is a dial number corresponding to the emergency call destination device 60. . Here, since the dial number corresponding to the emergency call destination device 60 has been input, the emergency signal determination unit 16 determines that the dial number corresponding to the emergency call destination device 60 has been input. When the emergency signal determination unit 16 determines that the dial number corresponding to the emergency call destination device 60 has been input to the input unit 13, the emergency call process by line switching is started (1).

  The switching determination unit 14 determines to make an emergency call through an individual channel. The switching determination unit 14 transmits the determination result to the emergency information adding unit 15. The emergency information adding unit 15 creates information in which an individual channel assignment request is added to an emergency call. The dedicated channel here is, for example, a dedicated physical channel defined by DPCH (Dedicated Physical Channel) of 3GPP standard. The DPCH is composed of a channel for transmitting data and a channel for controlling transmission power and the like, and is a communication terminal that is a bidirectional channel in the uplink (direction from the communication terminal 10 toward the RAN 20) / downlink (direction from the RAN 20 toward the communication terminal 10). 10 is a physical channel that is individually assigned to 10.

  An “RRC connection request (Emergency Call)” including a connection request by an individual channel for making an emergency call (emergency call) is transmitted to the network (RAN20, CN30) via the communication IF unit 11 (2).

  When the RAN 20 or the CN 30 receives the emergency call from the communication terminal 10, it confirms whether or not the individual channel can be secured. When the dedicated channel resource is available in the RAN 20 or the CN 30, an emergency call through the dedicated channel is made to the emergency call destination device 60.

  On the other hand, when the communication channel 10 fails to secure the dedicated channel because all the dedicated channels are in use (DPCH allocation failure), the emergency call due to the line switching of the communication terminal 10 fails (3).

  When the resource of the dedicated channel by the cell transmitted from the communication terminal 10 is not available, information indicating that the reservation (establishment) of the dedicated channel has failed (“RRC connection reject message”) is transmitted from the RAN 20 to the communication terminal 10. (4).

  The communication terminal 10 receives the “RRC connection reject message” via the communication IF unit 11. This “RRC connection reject message” is transmitted from the communication IF unit 11 to the switching determination unit 14. When receiving the “RRC connection reject message”, the switching determination unit 14 determines that the dedicated channel setting has failed, and transmits the determination result to the emergency information adding unit 15.

  The emergency information adding unit 15 creates information by adding a common channel allocation request to an emergency call. The communication processing unit 17 starts a process for making an emergency call through the common channel (RACH (S-CCPCH)) (5). The RACH here is an uplink common channel and is a physical channel for transmitting control information and user data. At this time, the user is notified by displaying on the output unit 12 that the emergency call is being executed through the common channel.

  The data creation unit 18 creates information (data) for emergency call when making an emergency call through the common channel (6). For creating the emergency call information, for example, an emergency call message is stored in the storage unit 25 in advance, and the user selects the stored message and adds information such as characters input by the user. Create by.

  The communication processing unit 17 transmits an “RRC connection request (Originating Interactive Call)” including a connection request through the common channel to the RNC 22 of the RAN 20 in order to make an emergency call through the common channel (7). The communication processing unit 17 secures a common channel by performing control processing with the RAN 20 and the CN 30. At this time, settings for packet communication performed between the communication terminal 10 and the network (RAN20, CN30) are performed in the communication terminal 10 or the network.

  “SM (Session Management) (SM Active PDP (Packet Data Protocol) Context Accept”) is transmitted from the network (RAN 20, CN 30) to the communication terminal 10 (9), and packet communication is performed between the RAN 20 or CN 30 and the communication terminal 10. Here, SM is a protocol for providing a packet switching service, and is a communication control protocol between the communication terminal 10 and the network (RAN20, CN30). The information for emergency call created in (1) is transmitted to the emergency call destination device 60 via the RAN 20 and CN 30 by packet communication (10).

  When transmitting emergency call information to the emergency call destination device 60, the output unit 12 of the communication terminal 10 displays information related to the emergency call. FIG. 5 to FIG. 6-3 are diagrams illustrating an example of a screen displayed on the output unit 12 when an emergency call is made.

  FIG. 5 is a diagram showing an example of a screen display when an emergency call is made by “automatic setting”. Here, when an emergency call is made by e-mail or SMS, “the telephone line is congested and the emergency call is automatically sent as e-mail”, “the telephone line is congested and the emergency call is automatically sent as SMS. A message such as "Sent" has been displayed.

  Information automatically transmitted by the automatic setting includes a telephone number of the reporter (communication terminal 10) (information for identifying the communication terminal 10), an e-mail address, a report time (information on the date and time when an emergency call was made) Is included. In addition, as information that is automatically transmitted, when the communication terminal 10 can acquire information regarding the position of the communication terminal 10 by a GPS (Global Positioning System) function, information regarding the position of the communication terminal 10 may be included.

  Here, the screen display when the emergency call is not “automatic setting” will be described. FIG. 6A is a diagram illustrating an example of a screen display when an emergency call is made by mail and SMS. Here, in order to prompt the user to make an emergency call by e-mail or SMS, “Telephone line is congested, please switch to emergency mail and send it”, “Telephone line is congested, "Please switch to SMS and send" message.

  When the user inputs instruction information to make an emergency call by mail or SMS from the input unit 13 in the state of the screen shown in FIG. 6A (for example, pressing the “OK” button), the output unit 12 displays the emergency call destination. A screen for setting contents to be notified to the device 60 is displayed.

  FIG. 6B is a diagram illustrating an example of a screen for setting contents to be notified to the emergency call destination device. The output unit 12 displays a screen for inputting, for example, an “emergency call type” indicating an emergency call type and an “emergency call summary” indicating an outline of an emergency call as contents to be notified to the emergency call destination device 60. The user sets the content notified to the emergency call destination device 60 based on the content displayed on the output unit 12. For example, when “Earthquake”, “Traffic accident”, “Flood”, or “Content” is displayed as “Emergency call type”, the user selects the type of emergency call to be specified from these display items (specified) And input to the input unit 13. When “Emergency call related to human life” or “Other” is displayed as “Emergency call summary”, the user selects the summary of the emergency call to be designated from these display items and inputs it to the input unit 13 To do. Further, a message as necessary is input to the input unit 13 as the content notified to the emergency call destination device 60.

  After inputting the “emergency call type” and “emergency call summary”, for example, by pressing the “confirm” button (entering confirmation instruction information), the information set as the content to be notified to the emergency call destination device 60 is displayed. It is transmitted to the emergency call destination device 60. The destination address of the emergency call destination device 60 is stored in advance in a storage unit (not shown) or the like.

  FIG. 6C is a diagram of an example of a screen display when an emergency call is made with a voice memo. Here, in order to make an emergency call by voice, a message such as “Telephone line is congested, please switch emergency call to voice memo transmission” is displayed. If the user inputs confirmation information indicating that the user has confirmed the message from the input unit 13 (pressing the “OK” button) in the state of the display screen, the output unit 12 indicates that the voice memo is ready for recording. Display the screen shown. In this state, when the user inputs information indicating the start of recording from the input unit 13 (pressing the “start” button), voice input by the input unit 13 is started. The voice information input to the input unit 13 is stored (recorded) by a storage device (not shown) or the like. When the user inputs information indicating the end of recording from the input unit 13 (pressing the “Done” button), the voice input by the input unit 13 is set to stop (end). Further, when the user inputs information indicating resumption of recording from the input unit 13 (pressing the “return” button), the input of the voice by the input unit 13 is set to resume.

  The emergency call destination device 60 confirms the content of the received emergency call. At this time, the emergency call destination device 60 transmits a response (response information) to the emergency call to the user (communication terminal 10) as necessary. When the communication terminal 10 receives the response information from the emergency call destination device 60, the communication terminal 10 notifies the user that the response information has been received (display of characters or the like or voice output).

  When the emergency call destination device 60 transmits response information to the communication terminal 10, the network (RAN 20, CN 30) analyzes the telephone number of the response information sender (emergency call destination device 60). Thereby, the network side confirms that the information sent from the emergency call destination device 60 to the communication terminal 10 is a response to the emergency call. When the network (RAN20, CN30) confirms that the response information has been transmitted from the emergency call destination device 60, the network (RAN20, CN30) preferentially assigns DPCH to the emergency call destination device 60 and makes an emergency call by circuit switching. Also good.

  Further, the emergency call destination device 60 may transmit response information to the emergency call to the communication terminal 10 by DPCH or FACH (Forward Access Channel) which is a common channel. The FACH here is a physical channel used for transmission of control information and user data on an uplink common channel.

  In this embodiment, an emergency call (emergency information transmission) is performed from the communication terminal 10 to the emergency call destination device 60. However, information to be transmitted from the communication terminal 10 to the emergency call destination device 60 is emergency information. Other information may be used as long as it is information that needs to be transmitted and received preferentially from the communication terminal 10 to the emergency call destination device 60.

  In this embodiment, when an individual channel cannot be allocated, an emergency call is made using a common channel. However, this is not the only case where an individual channel cannot be allocated, and an individual channel is allocated. You may make an emergency call through the common channel before.

  As described above, according to the embodiment, it is possible to make an emergency call to the emergency call destination device 60 through the common channel even when there is no free resource in the dedicated channel. Further, even when the individual channels are all used for important communication or emergency communication, the communication terminal 10 can make an emergency call without opening the important communication or emergency communication channel. Therefore, even when the individual channel cannot be used, information can be quickly transmitted to the emergency call destination device 60. Further, when the communication terminal 10 cannot make an emergency call through the individual channel, the communication terminal 10 makes an emergency call through the common channel, so that it is possible to perform efficient data communication with the emergency call destination device 60. Further, the communication IF unit 11 receives information from the network that the reservation of the individual channel has failed, and the switching determination unit 14 makes an emergency call through the common channel based on the information received by the communication IF unit. It is possible to appropriately determine whether or not to make an emergency call. Therefore, efficient data communication can be performed with respect to the emergency call destination device 60.

  As described above, the communication terminal according to the present invention is suitable for information transmission when there is no free resource for a dedicated channel.

It is a figure for demonstrating the structure of the communication network which concerns on embodiment. It is a block diagram which shows the structure of a communication terminal. It is a sequence diagram which shows the processing procedure of the emergency call by a communication terminal. It is a figure which shows an example of the setting screen of an emergency call. It is a figure which shows an example of the screen display at the time of making an emergency call by "automatic setting". It is a figure which shows an example of the screen display at the time of making an emergency call by mail and SMS. It is a figure which shows an example of the screen which sets the content notified to an emergency call destination apparatus. It is a figure which shows an example of the screen display at the time of making an emergency call by a voice memo.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Communication terminal 11 Communication IF part 12 Output part 13 Input part 14 Switching judgment part 15 Emergency information addition part 16 Emergency signal discrimination | determination part 17 Communication processing part 18 Data preparation part 19 Control part 20 RAN
21 BTS
22 RNC
25 storage unit 30 CN
31 MSC / VLR
32 GMSC
33 SGSN
34 GGSN
40 Telephone network 50 Internet 60 Emergency call destination device

Claims (3)

In a communication terminal that transmits information to an information transmission destination device that is a transmission destination of information connected to a communication network via an individual channel assigned to each communication device or a common channel that shares a radio frame with a plurality of communication devices.
A channel selection unit that selects whether the information to be transmitted to the information transmission destination device is performed by the dedicated channel or the common channel;
A connection information creation unit that creates a request for transmitting information to the information transmission destination device on the channel selected by the channel selection unit as connection request information;
A communication unit that transmits the connection request information created by the connection information creation unit to a base station apparatus that performs allocation control of a common channel or an individual channel in the communication network; and
With
The communication terminal transmits information to the transmission destination device via a common channel or a dedicated channel assigned by the base station device.   The communication terminal according to claim 1, wherein the channel selection unit selects the common channel when it is determined that communication using the dedicated channel with the information transmission destination device cannot be performed. The communication unit receives information transmitted from the base station device,
The channel selection unit, based on information received from the base station apparatus by the communication unit, determines whether or not communication with the information transmission destination apparatus can be performed. Item 3. The communication terminal according to Item 1 or 2.

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