Method for establishing an emergency call from a mobile phone

Abstract: A method for transmitting an emergency call of a mobile phone includes the steps of: receiving position recognition information from a base station via a forward channel in roaming a mobile terminal; varying a search position on an emergency call mapping table previously stored in a memory according to the received position recognition information; and transmitting a call by a phone number set on the varied search position when an emergency call needs to be transmitted. With this method, even though the user is not aware of the emergency call number of a country or an area where he uses his mobile phone to make an emergency call or even though he or she is not aware of a one-touch dial number or a manual for making a call, the user can easily make an emergency call Moreover, by linking the read address of the phone book, in which the emergency call number has been stored, to the key for making an emergency call, making an emergency call can be promptly performed automatically by one-time key manipulation.

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for transmitting an emergency call of a mobile phone. 2. Description of the Background Art Figure 1 illustrates a general mobile phone (mobile terminal). As shown in the drawing, the mobile phone includes a main body 1, an LCD 2 and a key pad unit 3 provided with keys for inputting a phone number and a text data and other various function keys. In this respect, the function keys refer to keys for searching, storing, deleting and menu selection keys. A communicating method of the mobile phone constructed as described above will now be explained. 1) General communication When a mobile phone is powered-up, it receives a pilot channel, a synchronous channel and a paging channel through a forward channel between the mobile phone and a base station, by which the mobile phone is ready for providing service to a user. In this state, a user inputs a phone number of a called party by operating a key pad (3) of the mobile phone. And, the user confirms whether the phone number of a called party has been properly inputted through the LCD 2 Upon confirmation of proper inputting, the user presses a communication key (or 'SEND'). Then, a call is established between the user and the called party through a base station, a base station controller and a mobile switching center, so that the user can communication with the called party by means of the mobile phone. At this time, the signal is transmitted from the mobile phone to the base station through a reverse channel. That is, a voice or (a data) and signal information are transmitted via a reverse communication channel, while a response to a message received via a paging channel is transmitted via an access channel. 2) Emergency communication A phone number for an emergency call is distinguished from general phone numbers. For example, a phone number for a crime report is 112 and a phone number for a fire or a disaster reports is 119. Accordingly, the user directly inputs a phone number for an emergency call by operating the key pad (3) of the mobile phone to communicate with a called party in the same manner as the general communication. In detail, the user inputs a phone number, i.e., '112', for an emergency call through a normal dialing method. The inputted phone number ('112') is compared with a mapping table stored in a memory unit (not shown) of the mobile phone, to check whether there is a corresponding phone number ('112') in the mapping table. At this time, in case that the corresponding phone number ('112') exists in the mapping table, its area position is identified to check whether the corresponding phone number ('112') is identical to the emergency call number of the recognized area. In case that the phone number ('112') is identical to the emergency call number of the recognized area, it is called as it is, while, in case that the phone number ('112') is not identical to the emergency call number of the recognized area, the phone number ('112') is replaced with an emergency phone number of the corresponding area provided by the mapping table, thereby trying to make an emergency call. The mobile phone user may store a phone number for an emergency call in a memory region of the mobile phone by using the function keys provided to the mobile phone, so that he or she can try to make an emergency call by operating a one-touch dial. Recently, as an agreement has been made between service providers to provide a roaming service to users by using a system of a different communication providers, a communication area of a mobile phone is gradually extended from a domestic communication area to an international communication service area. Accordingly, with the mobile phone registered in a domestic area, the user can be provided with the same communication service even in a foreign country. Therefore, in case that the user wants to make an emergency call in a foreign country with the mobile phone registered in his or her own country, the user should be aware of the emergency phone number of the country or the area that he or she wants to stay and use his or her mobile phone, or the user should store the emergency phone number in the mobile phone in advance. In this respect, however, in case that the user goes to a foreign country for a travel or a for a business trip, it is not easy for the user to be aware of an emergency phone number of the foreign country. Besides a special occasion, for most users, it is hardly expected for them to know the emergency phone number of the foreign country or to store the emergency phone number in a memory unit of the mobile phone. Therefore, in the past, unless the user is aware of the emergency phone number of the foreign country where he or she stays and uses use a mobile phone, or unless the user is aware of a one-touch dial number or its manual, the user can not use the emergency call or time for calling an emergency call is delayed. WO98/48577 discloses a method for transmitting an emergency call using a mobile phone. This document indicates that the mobile unit may use the current country code to index a stored data base of numbers and substitute the correct emergency number for the incorrect number inputted by the user. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for transmitting an emergency call of a mobile phone which is capable of making an emergency call promptly in occurrence of emergency situation. Another object of the present invention is to provide a method for transmitting an emergency call of a mobile phone which is capable of automatically making an emergency call by having an additional key for an emergency call. To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a method according to claim 1. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. In the drawings: Figure 1 illustrates a general mobile phone (mobile terminal). Figure 2 illustrates a mapping table storing MCC and emergency phone numbers by countries adopted in the present invention; Figure 3 is a flow chart of a process of updating and storing an MCC in a method for transmitting an emergency call of a mobile phone in accordance with a second embodiment of the present invention; Figure 4 is a flow chart of a process of transmitting an emergency call in the method for transmitting an emergency call of a mobile phone in accordance with the second embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In the present invention, a key for transmitting an emergency call is additionally designated in a mobile phone or a specific key, ie., number '9' key (generally it is displayed in a red color) is designated for a one-touch key, thereby making an emergency call. Therefore, the method for transmitting of an emergency call of a mobile phone is operable by software, without requiring any additional element in terms of hardware. In addition, as shown in Figure 2, the mapping table including the MCCs and emergency call numbers by countries is stored in the memory region of the mobile phone. Accordingly, an worldwide database of emergency call numbers can be constructed by corresponding emergency call number used by countries or areas to the MCC, that is, a country code, by using the mapping table. Method for transmitting an emergency call of a mobile phone will now be described in detail. When the mobile phone is first powered-up, the mobile phone receives a pilot channel, a synchronous channel and a paging channel via a forward channel from a base station, and in this state, the mobile phone receives an extended system parameters message (ESPM) among overhead messages of the paging channel The ESPM includes a field having the MCC (Mobile Country Code) values, so that the mobile phone stores the MCC field values upon receipt of the ESPM. The paging channel can be largely divided into an overhead message transmitted to every mobile phone in a service area and a personal station directed message transmitted to a specific mobile phone The overhead message includes information related to connection of a mobile station, frequency information of a base station, information on international roaming and information on neighboring base station. The personal station directed message includes a message for paging, a command and a channel allocation message. And, the mobile phone includes a first register storing an inherent MCCp and a second register for storing the MCCs transmitted through the ESPM. Accordingly, the mobile phone stores the initial data transmitted from the base station in the MCCs, and compares it with a data periodically transmitted from a base station to thereby update the data. Figure 3 is a flow chart of a process of updating and storing an MCC in a method for transmitting an emergency call of a mobile phone in accordance with a second embodiment of the present invention, and Figure 4 is a flow chart of a process of transmitting an emergency call in the method for transmitting an emergency call of a mobile phone in accordance with the second embodiment of the present invention With reference to Figure 3 when a new ESPM is received the MSM stores the MCCs in the second register (S30-S32). At the same time the MSM searches an MCCm identical to the MCCs from the mapping table and stores its emergency call number corresponding to the searched MCCm in a phone book (S33). And then, the MSM links-a read address of the phone book storing the emergency call number to the emergency call key or to '9 key' (S34), That is, in case of using the '9 key' as a one-touch dial, the emergency call number is stored in the address '0' of the phone book. Accordingly, as shown in Figure 4 when the one-touch dial, the '9' key is depressed by the user (S40), the emergency call number stored in the address '9' of the phone book is read and making an emergency call is automatically tried (S41, S42). As so far described, according to the method for transmitting an emergency call of a mobile phone of the present invention, after the MCCm identical to the MCCs provided from the base station is searched, the emergency call number corresponding to the searched MCCm is read out from the mapping table, thereby trying to making an emergency call In addition, according to the method for transmitting an emergency call of a mobile phone of the present invention, after the MCCm identical to the MCCs provided from the base station is searched, the emergency call number corresponding to the searched MCCm is stored in the phone book. And then, the read address of the phone book in which the emergency call number has been stored is linked to the emergency calling key or '9' key. Accordingly, even though the user is not aware of the emergency call number of a country or an area where he uses his mobile phone to make an emergency call or even though he or she is not aware of a one-touch dial number or a manual for making a call, the user can easily make an emergency call. Moreover, by linking the read address of the phone book, in which the emergency call number has been stored, to the key for making an emergency call, making an emergency call can be promptly performed automatically by one-time key manipulation,

Claims: A method for transmitting an emergency call using a mobile phone during roaming, comprising the steps of: (a) receiving a mobile country code (MCC) from a base station (S30-S32); (b) using the mobile country code to identify a national emergency number from an emergency call number mapping table stored in a memory (S33); characterised in that (c) the identified national emergency number is stored in a read address of a phone book (S34); (d) the read address of the phone book in which the national emergency number is stored is linked to the emergency call key (S40-S41); and (e) the mergency call is directly transmitted using the emergency call key (S42); wherein the mobile country code is periodically transmitted through an extended system parameters message (ESPM) from a base station (S31), to thereby update the phone book with the energency number (S34). A method according to claim 1, wherein the emergency call number mapping table includes mobile country codes and the national emergency call numbers corresponding to these mobile country codes. A method according to claim 1 or claim 2, wherein the step of identifying the national emergency call number in an emergency call number mapping table comprises varying a search position in the emergency call number mapping table according to the received mobile country code. A method according to claim 3, wherein when varying the search position, a search position pre-set on the emergency call number mapping table when the user is in a different area is moved to a region in which the same mobile country code as the currently received mobile country code. A method according to claim 3 or claim 4, wherein the mobile country code is stored in memory when it is received, and is compared with the mobile country code in the emergency call number mapping table to identify the national emergency call number. A method according to any preceding claim, wherein an emergency call is transmitted by one touch dialling. A method according to any preceding claim, wherein the read address of the phone book is identical to the number of the emergency call key. A method according to any preceding claim, which further comprises allocating the mobile country code and the national emergency call number to a mapping table.

Inventors: JANG DAE-WON, LEE HEE-JUNG, JANG, DAE-WON, LEE, HEE-JUNG
Applicants: LG ELECTRONICS INC, LG ELECTRONICS INC.
Application year: 2000
Main classification: H04Q7
IPC codes: H04M1, H04B1, H04W4