Abstract:
Disclosed is a method for making an emergency call by using a mobile communication terminal. The method includes identifying a current position when a user makes an emergency call request; retrieving an emergency call number from emergency call numbers pre-stored for respective regions, the emergency call number being used in a region corresponding to the current position; and dialing the emergency call number.

Description:
PRIORITY 
     This application claims priority under 35 USC§119 to an application entitled “Method and Apparatus for Making Emergency Call by Using Mobile Communication Terminal” filed with the Korean Intellectual Property Office on Mar. 14, 2006 and assigned Serial No. 2006-23609, the contents of which are incorporated herein by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates generally to a mobile communication terminal, and in particular, to a method and an apparatus for making an emergency call in an urgent situation by using a mobile communication terminal. 
     2. Description of the Related Art 
     In general, when a user of a mobile communication terminal incorporating an emergency calling function confronts an urgent situation, the user can make an emergency call by operating a predetermined key so that a predetermined telephone number (e.g., telephone number of the national rescue center or other rescue corps) is automatically dialed or a pre-stored text message is transmitted to that number. 
     When the telephone number of the national rescue center has been pre-stored in the mobile communication terminal, however, the emergency calling function fails outside of that nation, because each nation has its own emergency call number. This means that, when the user operates the emergency key while staying in another nation, an emergency call cannot be made to that nation&#39;s rescue center. Furthermore, the user may not be aware of that nation&#39;s emergency call number. In this case, the user cannot easily contact the rescue center even by dialing numbers, to say nothing of using the emergency call function. 
     Even when the user has contacted the rescue center somehow, the user would have difficulty in describing the urgent situation due to the language barrier. 
     SUMMARY OF THE INVENTION 
     Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and an object of the present invention is to provide a method and an apparatus for making an emergency call by using a mobile communication terminal regardless of the current position. 
     Another object of the present invention is to provide a method and an apparatus for enabling a user to request an emergency rescue by making an easy emergency call at any location. 
     In order to accomplish this object, there is provided a method for making an emergency call by using a mobile communication terminal, the method including identifying a current position when a user makes an emergency call request; retrieving an emergency call number from emergency call numbers pre-stored for respective regions, the emergency call number being used in a region corresponding to the current position; and dialing the emergency call number. 
     In accordance with another aspect of the present invention, there is provided an apparatus for making an emergency call by using a mobile communication terminal, the apparatus including a memory unit for storing a number of emergency call numbers used in respective regions and a control unit for identifying a current position when a user makes an emergency call request, the control unit retrieving an emergency call number from the emergency call numbers, the emergency call number being used in a region corresponding to the current position, and dialing the emergency call number. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other objects, features, and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  shows a construction of a communication system based on the present invention; 
         FIG. 2  is a block diagram illustrating a construction of a mobile communication terminal according to a first embodiment of the present invention; 
         FIG. 3  is a flow chart illustrating operation steps of a mobile communication terminal according to a first embodiment of the present invention; and 
         FIG. 4  is a block diagram illustrating a construction of a mobile communication terminal according to a second embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein is omitted to avoid making the subject matter of the present invention unclear. 
     A communication system based on the present invention will now be described with reference to  FIG. 1 , which shows its construction. Referring to  FIG. 1 , the communication system includes a Global Positioning System (GPS) satellite  10 , a mobile communication terminal  20 , a mobile communication network  30 , a public network  40 , and an emergency rescue center  50 . 
     The GPS satellite  10  periodically broadcasts GPS signals. The mobile communication network  30  provides the mobile communication terminal  20  with various mobile communication services. The mobile communication network  30  interworks with a navigation server (not shown) so as to provide a navigation service. The mobile communication network  30  interworks with the public network  40  so as to provide the mobile communication network  20  with a communication service via the public network  40 . The emergency rescue center  50  is connected to the public network  40  and, in response to an emergency call from a terminal, deals with the emergency situation. The mobile communication terminal  20  interworks with the mobile communication network  30  so as to perform mobile communication and receives GPS signals from the GPS satellite  10 . 
     When a user requests an emergency call, the mobile communication terminal positions the user based on GPS signals received from the GPS satellite  10 . The mobile communication terminal  20  then retrieves the emergency call number (e.g., telephone number of the emergency rescue center  50 ) corresponding to the user&#39;s current position from pre-stored emergency call numbers in various positions and dials that number. When the call is connected to the emergency rescue center  50 , the mobile communication terminal  20  transmits a pre-stored emergency message (e.g., voice message) thereto. 
     According to a second embodiment of the present invention, the mobile communication terminal  20  requests the mobile communication network  30  to position the user at the user&#39; request for an emergency call. After receiving information regarding the user&#39;s current position from the mobile communication network  30 , the mobile communication terminal  20  retrieves the emergency call number (e.g., telephone number of the emergency rescue center  50 ) corresponding to the user&#39;s current position from pre-stored emergency call numbers in various positions and dials that number. When the call is connected to the emergency rescue center  50 , the mobile communication terminal  20  transmits a pre-stored emergency message (e.g. voice message) thereto. 
       FIG. 2  is block diagram illustrating a construction of the mobile communication terminal  20  according to the present invention. Referring to  FIG. 2 , the mobile communication terminal  20  includes a control unit  21 , a memory unit  22 , a Text To Speech (TTS) module  23 , a GPS receiver  24 , a key input unit  25 , an audio processing unit  26 , a baseband processing unit  27 , and an RF (Radio Frequency) module  28 . 
     The control unit  21  controls the overall operation of the mobile communication terminal. 
     The key input unit  25  has character keys, to which the Roman alphabet or the Korean alphabet and numerals 0-9 are allocated, special symbol keys (e.g., * and # keys), and function keys for various functions of the mobile communication terminal, including menu, selection, speech, deletion, power on/off, volume, and photography. When the user operates the keys, the key input unit  25  transmits corresponding key input data to the control unit  21 . According to the present invention, the key input unit  25  has an emergency call key. When the user operates the emergency call key, the key input unit  25  outputs key input data, which informs that the user has requested an emergency call, to the control unit  21 . 
     The RF module  28  transmits/receives radio signals to/from a mobile communication base station via an antenna. Particularly, the RF module  28  modulates signals to be transmitted, which are inputted from the control unit  21  via the baseband processing unit  27 , and transmits them via the antenna. The RF module  28  demodulates RF signals, which are received via the antenna, and transmits them to the control unit  21  via the baseband processing unit  27 . The baseband processing unit  27  processes baseband signals transmitted/received between the RF module  28  and the control unit  21 . 
     The audio processing unit  26  is connected to the control unit  21  and performs audio communication and voice recording together with a microphone MIC and a speaker SPK connected to the audio processing unit  26 . 
     The memory unit  22  acts as a working memory of the control unit  21  and stores programs necessary for processing and control of the control unit  21 , reference data, and updateable storage data. According to the present invention, the memory unit  22  stores regional information corresponding to positional coordinates included in GSP reception signals, as well as emergency call numbers for respective regions or nations. The emergency call numbers can include telephone numbers of emergency rescue centers  50  (e.g., 119 and 911) and specific telephone numbers designated by the user. In addition, the memory unit  22  according tithe present invention stores text-type emergency messages for requesting help or describing the situation, which have been prepared in regional languages. The messages can be determined by the manufacturer or composed by the user. 
     The TTS module  23  converts text data into audio data. Particularly, the TTS module  23  converts an inputted emergency message into an emergency voice message and outputs it under the control of the control unit  21 . In addition, the TTS module  23  converts positional coordinates into audio data and outputs it. 
     The GPS receiver  24  receives GPS signals, which are broadcasted by the GPS satellite  10 , and outputs them to the control unit  21 . 
       FIG. 3  is a flow chart illustrating operation steps of the mobile communication terminal  20  according to the first embodiment of the present invention, which is constructed as mentioned above. Referring to  FIG. 3 , the control unit  21  monitors an emergency call request from the user in step  101 . When the user makes an emergency call request by operating the emergency call key or selecting a menu, for example, the control unit  21  proceeds to step  103 . The control unit  21  detects the current positional coordinate based on GPS signals received by the GPS receiver  24  at the user&#39;s emergency call request in step  103  and proceeds to step  105 . The control unit  21  identifies the region in which the user is currently positioned based on the detected positional coordinate in step  105  and proceeds to step  107 . The control unit  21  retrieves an emergency call number corresponding to the identified region and an emergency message prepared in the regional language in step  107  and proceeds to step  109 . For example, when the user is currently positioned in Seoul, the corresponding emergency call number 119 is retrieved together with an emergency message prepared in Korean. The control unit  21  outputs the retrieved emergency message and the current positional coordinate to the TTS module  23  in step  109  so that a voice message containing the current positional coordinate and an emergency voice message are created. The control unit  21  proceeds to step  111 , in which it dials the emergency call number retrieved in step  107 , and proceeds to step  113 . The control unit  21  confirms if a call has been connected in step  113  and, if so, proceeds to step  117 . The control unit  21  transmits the emergency voice message and the voice message containing the current positional coordinate in step  117  and ends the operation. If it is confirmed in step  113  that no call has been connected, the control unit proceeds to step  115  and repeats dialing until a call is connected. 
       FIG. 4  is a block diagram illustrating a construction of a mobile communication terminal  20  according to a second embodiment of the present invention. Referring to  FIG. 4 , the mobile communication terminal  20  includes a control unit  121 , a memory unit  122 , a display device  123 , a key input unit  124 , an audio processing unit  125 , a baseband processing unit  126 , and an RF module  127 . 
     The control unit  121  controls the overall operation of the mobile communication terminal. 
     The key input unit  124 , the audio processing unit  125 , the baseband processing unit  126 , and the RF module  127  have similar construction and operation as those of the key input unit  25 , the audio processing unit  26 , the baseband processing unit  27 , and the RF module  28 , have been described with reference to  FIG. 2 . 
     The memory unit  122  acts as a working memory of the control unit  121  and stores programs necessary for processing and control of the control unit  121 , reference data, and updateable storage data. According to the present invention, the memory unit  122  stores emergency call numbers for respective regions or nations. The emergency call numbers can include telephone numbers of emergency rescue centers  50  (e.g., 119 and 911) and specific telephone numbers designated by the user. In addition, the memory unit  122  according to the present invention stores emergency voice messages for requesting help or describing the situation, which have been prepared in regional languages. The messages may be determined by the manufacturer or composed by the user. 
     When the user makes an emergency call request by operating the emergency call key, for example, the mobile communication terminal  20  according to the second embodiment of the present invention, which is constructed as mentioned above, requests the mobile communication network  30  to provide information regarding the current position of the mobile communication terminal  20 . Upon receiving information regarding the current position from the mobile communication network  30 , the mobile communication terminal  20  retrieves an emergency call number corresponding to the current region and an emergency voice message prepared in the regional language. For example, when the user is currently positioned in New York, the corresponding emergency call number 911 is retrieved together with an emergency voice message prepared in English. The control unit  121  dials the retrieved emergency call number and, when a call is connected to the emergency rescue center  50 , transmits the emergency voice message. The control unit  121  can transmit the information regarding the current position, which has been received from the mobile communication network  30 , to the emergency rescue center  50  as a text message. 
     As mentioned above, the present invention is advantageous in that, when a user makes an emergency call request, his mobile communication terminal  20  retrieves an emergency call number corresponding to the user&#39;s current position and dials that number so that, after a call is connected to the receiving side, an emergency voice message is transmitted. As such, the user can request help in an urgent situation regardless of the current position. 
     While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.