WO2009078566A1 - Mobile communication terminal and international roaming method thereof - Google Patents

Mobile communication terminal and international roaming method thereof Download PDF

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Publication number
WO2009078566A1
WO2009078566A1 PCT/KR2008/006006 KR2008006006W WO2009078566A1 WO 2009078566 A1 WO2009078566 A1 WO 2009078566A1 KR 2008006006 W KR2008006006 W KR 2008006006W WO 2009078566 A1 WO2009078566 A1 WO 2009078566A1
Authority
WO
WIPO (PCT)
Prior art keywords
radio communication
program
communication program
international roaming
mobile communication
Prior art date
Application number
PCT/KR2008/006006
Other languages
French (fr)
Inventor
Hyung Deug Bae
Nam Hoon Park
Original Assignee
Electronics And Telecommunications Research Institute
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Electronics And Telecommunications Research Institute filed Critical Electronics And Telecommunications Research Institute
Publication of WO2009078566A1 publication Critical patent/WO2009078566A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data
    • H04W8/245—Transfer of terminal data from a network towards a terminal
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F8/00—Arrangements for software engineering
    • G06F8/60—Software deployment
    • G06F8/61—Installation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/021—Terminal devices adapted for Wireless Local Loop operation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/18—Service support devices; Network management devices

Definitions

  • the present invention relates to a mobile communication terminal and an international roaming method thereof, and more particularly, to a mobile communication terminal that supports international roaming in a mobile communication terminal to which a software based radio communication is applied and an international roaming method thereof.
  • the traditional mobile communication terminals are equipped with hardware chips implementing specific wireless transmitting and receiving technology. Therefore, it is a disadvantage that the traditional mobile communication terminals can't use any other wireless communication system that their hardware chips don't support.
  • an object of the present invention to provide an international roaming method of a mobile communication terminal, comprising selecting a visiting country to be internationally roamed when international roaming is requested, determining whether wireless communication programs corresponding to the selected visiting country exist or not at the mobile terminal, making connection to an external program server to request the wireless communication programs corresponding to the selected visiting country in case the wireless communication programs don't exist, downloading the corresponding wireless communication programs from the program server and installing the downloaded wireless communication programs at the mobile terminal.
  • the wireless communication programs are saved in the nonvolatile memory space.
  • a mobile communication terminal comprises a storage unit for storing downloaded radio communication programs and a controller for determining whether a radio communication program corresponding to a selected visiting country exists or not in the storage unit when international roaming is requested and for making connection to an external program server and for receiving a corresponding radio communication program to install the received radio communication program when the radio communication program corresponding to the visiting country does not exist.
  • the mobile communication terminal comprises a CPU RAM for storing the programs being executed on CPU and a DSP RAM for storing the programs being executed on DSP.
  • CPU executable programs are copied from the storage unit to the CPU RAM to execute and DSP executable programs are copied from the storage unit to the DSP RAM to execute respectively.
  • the storage unit further comprises a nonvolatile memory unit in which the radio communication program downloaded from the program server is stored.
  • FIG. 1 illustrates the structure of a system for describing a mobile communication terminal according to an embodiment of the present invention
  • FIG. 2 is a block diagram illustrating the structure of the mobile communication terminal according to an embodiment of the present invention.
  • FIG. 3 illustrates the operations of the mobile communication terminal according to an embodiment of the present invention.
  • FIGs. 4 and 5 are flowcharts illustrating the operations of the international roaming apparatus of the mobile communication terminal according to an embodiment of the present invention. Best Mode for Carrying Out the Invention
  • FIGs. 1 and 2 illustrate the international roaming apparatus of a mobile communication terminal according to an embodiment of the present invention.
  • FIG. 1 illustrates the structure of a system for describing a mobile communication terminal according to an embodiment of the present invention.
  • a network applied to the present invention includes a mobile communication terminal 1 and a program server 2.
  • radio communication programs of various methods are stored in the program server 2 so that a predetermined radio communication program is provided in accordance with the request of the mobile communication terminal 1 connected to the program server 2. Therefore, the mobile communication terminal 1 is connected to the program server 2 to receive radio communication programs such as GSM and CDMA.
  • FIG. 2 is a block diagram illustrating the structure of the mobile communication terminal according to an embodiment of the present invention.
  • the mobile communication terminal 1 includes a controller 10, a radio frequency (RF) transmitter and receiver 30, a digital signal processor (DSP) unit 20, a memory 40, an input unit 50, and an output unit 60.
  • RF radio frequency
  • DSP digital signal processor
  • the memory 40 includes a random access memory (RAM) and a non-volatile memory 43.
  • the non-volatile memory 43 is formed of a flash memory.
  • the RAM is divided into a CPU RAM 41 connected to the controller 10 and a DSP RAM 45 connected to the DSP.
  • the controller 10 is connected to the CPU RAM 41 and the non- volatile memory 43 and executes an operating system (OS) program stored in the CPU RAM 41 to control the operation of the mobile communication terminal 1.
  • the controller 10 can execute programs stored in the non-volatile memory 43 and the CPU RAM 41.
  • the programs stored in the non- volatile memory 43 are copied to the DSP RAM 45 so that the programs can be executed by the DSP 20.
  • controller 10 is connected to the key button 50 and the display
  • the RF transmitter and receiver 30 receives an RF signal transmitted by a base station through an antenna. At this time, the RF transmitter and receiver 30 down- converts the received RF signal to convert the down-converted RF signal into an intermediate frequency (IF) signal and a base-band signal. At this time, the IF signal or the base-band signal that is received through the RF transmitter and receiver 30 to be converted is applied to the DSP unit 20.
  • IF intermediate frequency
  • the DSP unit 20 is formed of a plurality of DSPs and includes transmitting end processors 21 for processing a transmitting signal through transmission processing programs and receiving end processors 23 for processing a received signal through reception processing programs.
  • the transmission processing programs and the reception processing programs are stored in the DSP RAM 45.
  • the transmission processing programs and the reception processing programs implement the radio communication methods such as the GSM and the CDMA.
  • the operation mode of the mobile communication terminal 1 can be converted into GSM or CDMA method in accordance with which type of transmission and reception processing programs being copied to the DSP RAM 45 and executed.
  • the IF signal or the base-band signal is applied to the receiving end processor 23.
  • the receiving end processor 23 converts the IF signal or the base-band signal into a di- gitalized base band signal through filtering, decoding, and digitalizing processes. At this time, the receiving end processor 23 applies the digitalized signal to a speaker 65 to be output in the case of a voice or applies the digitalized signal to the controller 10 to be processed in the case of Internet data.
  • the transmitting end processor 21 receives transmission data such as voice data input through a microphone 55 or web data output from the controller 10. At this time, the transmitting end processor 21 encodes, multiplexes, and digitalizes data input using the transmission processing program to convert the encoded, multiplexed, and digitalized data into the IF or base-band signal and to apply the IF or base-band signal to the RF transmitter and receiver 30.
  • the RF transmitter and receiver 30 up-converts the IF or base-band signal applied from the transmitting end processor 21 of the DSP unit 20 into an RF signal to transmit the RF signal through the antenna.
  • FIG. 3 illustrates the operations of the mobile communication terminal according to an embodiment of the present invention.
  • the non-volatile memory 43 is divided into a managing code storage space 100 and a program storage space 200.
  • the basic managing programs of the mobile communication terminal 1 including a system boot code 101 and an installation program code 103 are stored in the managing code storage space 100.
  • a radio method A program file 201 and a radio method B program file 203 implement radio communication method A and B respectively.
  • Each of the radio method A program file 201 and the radio method B program file 203 consists of a plurality of programs. Some of the programs are copied to the CPU RAM 41 to be executed by the controller 10. The other programs are copied to the DSP RAM 45 to be executed by the DSP 20.
  • FIGs. 4 and 5 are flowcharts illustrating the operations of the international roaming apparatus of the mobile communication terminal according to an embodiment of the present invention, in which processes of installing radio communication programs for international roaming are illustrated.
  • the controller 10 detects the program of a radio communication method corresponding to a selected visiting country to determine whether the program of the corresponding radio communication method exists.
  • the program server 2 When it is determined that the corresponding radio communication program does not exist so that it is necessary to download the corresponding radio communication program (S 120), connection is made to the program server 2 to request the corresponding radio communication program (S 130).
  • the requested radio communication program is downloaded from the program server 2 (S 140), the received radio communication program is stored (S 150). At this time, the downloaded radio communication program is stored in the non- volatile memory 43.
  • controller 10 in order that the controller 10 installs a new wireless communication program, which is either already existed programs or newly downloaded programs, first the controller 10 terminates the currently executing programs (S200), and then deletes the loaded existing programs from the CPU RAM 41 and DSP RAM 45 respectively (S210), and finally starts the operations of program installation (S220 and S230).
  • the CPU executable radio communication programs are copied to the CPU RAM 41 and the DSP executable radio communication programs are copied to the DSP RAM 45 respectively (S220).
  • the radio communication programs copied to the CPU RAM 41 and the DSP RAM 45 are executed (S230) so that a wireless communication method implemented by the radio communication programs is operated at the mobile communication terminal 1.

Abstract

Enclosed are a mobile communication terminal and an international roaming method thereof. The international roaming method includes selecting a visiting country to be internationally roamed when international roaming is requested, detecting a radio communication program corresponding to the selected visiting country, making connection to an external program server to request the radio communication program corresponding to the selected visiting country when the radio communication program does not exist, and downloading the corresponding radio communication program from the program server to install the downloaded radio communication program. In the mobile communication terminal and the international roaming method thereof, no matter which radio communication method is used in a region visitied by a user, a radio communication program is newly installed in accordance with the radio communication method of the region so that the mobile communication terminal is reconstituted to perform communication. Therefore, the convenience of the use of the international roaming is remarkably improved.

Description

Description
MOBILE COMMUNICATION TERMINAL AND INTERNATIONAL ROAMING METHOD THEREOF
Technical Field
[1] The present invention relates to a mobile communication terminal and an international roaming method thereof, and more particularly, to a mobile communication terminal that supports international roaming in a mobile communication terminal to which a software based radio communication is applied and an international roaming method thereof.
[2] This work was supported by the IT R & D program of MIC/IITA [2006-S-012-02,
"Development of Middleware Platform Technology based on the SDR Mobile Station"]. Background Art
[3] In general, in order to be roamed internationally, mobile communication terminals need to be equipped with the hardware chips supporting the wireless communication method of the visiting country. For example, when you wish to make international roaming to European countries, it is impossible with the mobile communication terminal that is not equipped with the hardware chips supporting GSM standard to be roamed.
[4] As described above, the traditional mobile communication terminals are equipped with hardware chips implementing specific wireless transmitting and receiving technology. Therefore, it is a disadvantage that the traditional mobile communication terminals can't use any other wireless communication system that their hardware chips don't support.
[5] Recently, in order to compensate for such a disadvantage, a software based radio communication (SDR) technology or a technology referred to as software radio is spotlighted. Disclosure of Invention
Technical Problem
[6] In order to solve the above-described problems, it is an object of the present invention to provide an international roaming method of a mobile communication terminal, comprising selecting a visiting country to be internationally roamed when international roaming is requested, determining whether wireless communication programs corresponding to the selected visiting country exist or not at the mobile terminal, making connection to an external program server to request the wireless communication programs corresponding to the selected visiting country in case the wireless communication programs don't exist, downloading the corresponding wireless communication programs from the program server and installing the downloaded wireless communication programs at the mobile terminal. Here, the wireless communication programs are saved in the nonvolatile memory space. Technical Solution
[7] In addition, a mobile communication terminal comprises a storage unit for storing downloaded radio communication programs and a controller for determining whether a radio communication program corresponding to a selected visiting country exists or not in the storage unit when international roaming is requested and for making connection to an external program server and for receiving a corresponding radio communication program to install the received radio communication program when the radio communication program corresponding to the visiting country does not exist.
[8] In addition, the mobile communication terminal comprises a CPU RAM for storing the programs being executed on CPU and a DSP RAM for storing the programs being executed on DSP. During the process of radio communication program installation, CPU executable programs are copied from the storage unit to the CPU RAM to execute and DSP executable programs are copied from the storage unit to the DSP RAM to execute respectively.
[9] The storage unit further comprises a nonvolatile memory unit in which the radio communication program downloaded from the program server is stored.
Advantageous Effects
[10] In the mobile communication terminal according to the present invention and the international roaming method thereof, no matter which radio communication method is used in a region visited by a user, a radio communication program is newly installed in accordance with the radio communication method of the region so that the mobile communication terminal is reconstituted to perform communication. Therefore, the convenience of the use of the international roaming is remarkably improved. Brief Description of the Drawings
[11] FIG. 1 illustrates the structure of a system for describing a mobile communication terminal according to an embodiment of the present invention;
[12] FIG. 2 is a block diagram illustrating the structure of the mobile communication terminal according to an embodiment of the present invention;
[13] FIG. 3 illustrates the operations of the mobile communication terminal according to an embodiment of the present invention; and
[14] FIGs. 4 and 5 are flowcharts illustrating the operations of the international roaming apparatus of the mobile communication terminal according to an embodiment of the present invention. Best Mode for Carrying Out the Invention
[15] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[16] FIGs. 1 and 2 illustrate the international roaming apparatus of a mobile communication terminal according to an embodiment of the present invention.
[17] First, FIG. 1 illustrates the structure of a system for describing a mobile communication terminal according to an embodiment of the present invention. Referring to FIG. 1, a network applied to the present invention includes a mobile communication terminal 1 and a program server 2. Here, radio communication programs of various methods are stored in the program server 2 so that a predetermined radio communication program is provided in accordance with the request of the mobile communication terminal 1 connected to the program server 2. Therefore, the mobile communication terminal 1 is connected to the program server 2 to receive radio communication programs such as GSM and CDMA.
[18] The detailed structure of the mobile communication terminal according to the present invention will be described with reference to FIG. 2.
[19] FIG. 2 is a block diagram illustrating the structure of the mobile communication terminal according to an embodiment of the present invention.
[20] As illustrated in FIG. 2, the mobile communication terminal 1 according to the present invention includes a controller 10, a radio frequency (RF) transmitter and receiver 30, a digital signal processor (DSP) unit 20, a memory 40, an input unit 50, and an output unit 60.
[21] The memory 40 includes a random access memory (RAM) and a non-volatile memory 43. The non-volatile memory 43 is formed of a flash memory. The RAM is divided into a CPU RAM 41 connected to the controller 10 and a DSP RAM 45 connected to the DSP.
[22] The controller 10 is connected to the CPU RAM 41 and the non- volatile memory 43 and executes an operating system (OS) program stored in the CPU RAM 41 to control the operation of the mobile communication terminal 1. In addition, the controller 10 can execute programs stored in the non-volatile memory 43 and the CPU RAM 41. In addition, the programs stored in the non- volatile memory 43 are copied to the DSP RAM 45 so that the programs can be executed by the DSP 20.
[23] On the other hand, the controller 10 is connected to the key button 50 and the display
60 to process a command input through the key button 50 and to output data through the display 60.
[24] The RF transmitter and receiver 30 receives an RF signal transmitted by a base station through an antenna. At this time, the RF transmitter and receiver 30 down- converts the received RF signal to convert the down-converted RF signal into an intermediate frequency (IF) signal and a base-band signal. At this time, the IF signal or the base-band signal that is received through the RF transmitter and receiver 30 to be converted is applied to the DSP unit 20.
[25] The DSP unit 20 is formed of a plurality of DSPs and includes transmitting end processors 21 for processing a transmitting signal through transmission processing programs and receiving end processors 23 for processing a received signal through reception processing programs. At this time, the transmission processing programs and the reception processing programs are stored in the DSP RAM 45. Here, the transmission processing programs and the reception processing programs implement the radio communication methods such as the GSM and the CDMA. The operation mode of the mobile communication terminal 1 can be converted into GSM or CDMA method in accordance with which type of transmission and reception processing programs being copied to the DSP RAM 45 and executed.
[26] The IF signal or the base-band signal is applied to the receiving end processor 23.
The receiving end processor 23 converts the IF signal or the base-band signal into a di- gitalized base band signal through filtering, decoding, and digitalizing processes. At this time, the receiving end processor 23 applies the digitalized signal to a speaker 65 to be output in the case of a voice or applies the digitalized signal to the controller 10 to be processed in the case of Internet data.
[27] On the other hand, the transmitting end processor 21 receives transmission data such as voice data input through a microphone 55 or web data output from the controller 10. At this time, the transmitting end processor 21 encodes, multiplexes, and digitalizes data input using the transmission processing program to convert the encoded, multiplexed, and digitalized data into the IF or base-band signal and to apply the IF or base-band signal to the RF transmitter and receiver 30.
[28] The RF transmitter and receiver 30 up-converts the IF or base-band signal applied from the transmitting end processor 21 of the DSP unit 20 into an RF signal to transmit the RF signal through the antenna.
[29] FIG. 3 illustrates the operations of the mobile communication terminal according to an embodiment of the present invention.
[30] Referring to FIG. 3, the non-volatile memory 43 is divided into a managing code storage space 100 and a program storage space 200. First, the basic managing programs of the mobile communication terminal 1 including a system boot code 101 and an installation program code 103 are stored in the managing code storage space 100.
[31] On the other hand, programs implementing mobile communication methods are stored in the program storage space 200. A radio method A program file 201 and a radio method B program file 203 implement radio communication method A and B respectively. Each of the radio method A program file 201 and the radio method B program file 203 consists of a plurality of programs. Some of the programs are copied to the CPU RAM 41 to be executed by the controller 10. The other programs are copied to the DSP RAM 45 to be executed by the DSP 20.
[32] The operations of the international roaming apparatus of the mobile communication terminal according to the present invention having the above structure will be further described in detail.
[33] FIGs. 4 and 5 are flowcharts illustrating the operations of the international roaming apparatus of the mobile communication terminal according to an embodiment of the present invention, in which processes of installing radio communication programs for international roaming are illustrated.
[34] First, referring to FIG. 4, when international roaming is requested to the mobile communication terminal 1 (SlOO), wherein one country is selected as a visiting country from several country lists through the manipulation of the key button 50, the controller 10 detects the program of a radio communication method corresponding to a selected visiting country to determine whether the program of the corresponding radio communication method exists. When it is determined that the corresponding radio communication program does not exist so that it is necessary to download the corresponding radio communication program (S 120), connection is made to the program server 2 to request the corresponding radio communication program (S 130). When the requested radio communication program is downloaded from the program server 2 (S 140), the received radio communication program is stored (S 150). At this time, the downloaded radio communication program is stored in the non- volatile memory 43.
[35] After the radio communication program is downloaded, when an installation command for the downloaded radio communication program is given (S 160), a process proceeds to 'A' to start the program installation operation of FIG. 5.
[36] On the other hand, in the case where the program of the radio communication method corresponding to the selected visiting country already exists (S 120), and when the installation command for the stored radio communication program is given (S 160), the process proceeds to 'A' to start the program installation operation of FIG. 5.
[37] Referring to FIG. 5, in order that the controller 10 installs a new wireless communication program, which is either already existed programs or newly downloaded programs, first the controller 10 terminates the currently executing programs (S200), and then deletes the loaded existing programs from the CPU RAM 41 and DSP RAM 45 respectively (S210), and finally starts the operations of program installation (S220 and S230).
[38] In addition, among the radio communication programs stored in the non- volatile memory 43, the CPU executable radio communication programs are copied to the CPU RAM 41 and the DSP executable radio communication programs are copied to the DSP RAM 45 respectively (S220). And the radio communication programs copied to the CPU RAM 41 and the DSP RAM 45 are executed (S230) so that a wireless communication method implemented by the radio communication programs is operated at the mobile communication terminal 1.
[39] As described above, while the mobile communication terminal according to the present invention and the international roaming method thereof have been described with reference to the embodiment shown in the drawings, these are merely illustrative, and those skilled in the art will understand that various modifications and equivalent other embodiments of the present invention are possible. Consequently, the true technical protective scope of the present invention must be determined based on the technical spirit of the appended claims.
[40]
[41]
Industrial Applicability
[42] In the mobile communication terminal according to the present invention and the international roaming method thereof, no matter which radio communication method is used in a region visited by a user, a radio communication program is newly installed in accordance with the radio communication method of the region so that the mobile communication terminal is reconstituted to perform communication. Therefore, the convenience of the use of the international roaming is remarkably improved.
[43]

Claims

Claims
[1] An international roaming method of a mobile communication terminal, comprising: selecting a visiting country to be internationally roamed when international roaming is requested; detecting a radio communication program corresponding to the selected visiting country; making connection to an external program server to request the radio communication program corresponding to the selected visiting country when the radio communication program does not exist; and downloading the corresponding radio communication program from the program server to install the downloaded radio communication program.
[2] The international roaming method of claim 1, wherein the program server provides radio communication programs of different methods.
[3] The international roaming method of claim 1, wherein the radio communication programs are stored in a non-volatile memory space.
[4] The international roaming method of claim 1, further comprising: selecting a previously stored radio communication program to install the selected radio communication program when the radio communication program corresponding to the selected visiting country exists.
[5] The international roaming method of claim 1, further comprising: dividing the radio communication program into a CPU radio communication program and a DSP radio communication program to be stored when the radio communication program is installed.
[6] The international roaming method of claim 5, further comprising: executing the CPU radio communication program and the DSP radio communication program.
[7] The international roaming method of claim 1, further comprising: removing a previously installed radio communication program before installing the radio communication program.
[8] A mobile communication terminal, comprising: a storage unit for storing predetermined radio communication programs; and a controller for determining whether a radio communication program corresponding to a selected visiting country exists in the storage unit when international roaming is requested and for making connection to an external program server and for receiving a corresponding radio communication program to install the received radio communication program when the radio communication program corresponding to the visiting country does not exist.
[9] The mobile communication terminal of claim 8, wherein the controller divides the radio communication program into a CPU radio communication program and a DSP radio communication program to be installed when the radio communication program is installed.
[10] The mobile communication terminal of claim 9, wherein the storage unit comprises: a CPU RAM in which the CPU radio communication program is copied to be stored when the radio communication program is installed; and a DSP RAM in which the DSP radio communication program is copied to be stored.
[11] The mobile communication terminal of claim 8, wherein the storage unit further comprises a memory in which the radio communication program downloaded from the program server is stored, wherein the memory is a non-volatile memory.
[12] The mobile communication terminal of claim 8, wherein radio communication programs of different methods are stored in the program server to provide a radio communication program of a corresponding radio communication method in accordance with a request.
PCT/KR2008/006006 2007-12-17 2008-10-10 Mobile communication terminal and international roaming method thereof WO2009078566A1 (en)

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KR1020070132807A KR20090065316A (en) 2007-12-17 2007-12-17 Mobile communication terminal and international roaming method thereof
KR10-2007-0132807 2007-12-17

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US20040029575A1 (en) * 2000-05-26 2004-02-12 Mehul Mehta Management module for software defined radio
KR20040041288A (en) * 2002-11-09 2004-05-17 전자부품연구원 Effective software download and roaming method of reconfigurable communication device
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