JPH08186875A - Mobile terminal - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a mobile terminal device capable of supporting a plurality of mobile communication systems without having to carry a plurality of devices. [Structure] A baseband processing unit 5 that processes a transmission / reception signal with a baseband, a modulation / demodulation unit 2 that performs modulation / demodulation processing with an RF band, a radio wave transmission / reception antenna, and a base station that controls the modulation / demodulation unit and the baseband processing unit. C to control communication with
The PU 8, the IC card memory 14 storing the command code of the CPU for the specific mobile communication system and the parameters of the modulation / demodulation unit and the baseband processing unit, and the RAM storing the command code and the parameter from the IC card memory
13 and R storing the boot program for transferring it
Including the OM12, operates the CPU with the instruction code,
It is characterized in that parameters are initialized in the modulator / demodulator and the baseband processor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal device used for voice and data communication, and more particularly to a mobile terminal device which is not geographically fixed.

[0002]

2. Description of the Related Art In the field of mobile communication, analog mobile communication systems represented by Japanese high-capacity mobile telephone systems and American AMPS systems have been recently used, and recently, PD systems have been used.
Digital mobile communication systems such as C, GSM, US-TDMA, and PHS have been developed and put into practical use, and various services are provided throughout the world. On the other hand, technical fields such as personal IDs for ensuring security and IC cards for use as personal databases have been developed.

Conventionally, there has been a mobile terminal device used for mobile communication as shown in FIG. FIG. 7 is a block diagram showing the configuration of a conventional mobile terminal device. In FIG. 7, 1 is an antenna, 2 is a modulation / demodulation unit that modulates and demodulates transmission / reception signals, 3 is a demodulation signal, 4 is a modulation signal, 5 is a baseband processing unit that processes transmission / reception data with a baseband, and 6 is reception. Data or received voice, 7 transmitted data or transmitted voice, 8 CPU, 9 and 10 control signals for controlling the modulation / demodulation unit 2 and the baseband processing unit 5, respectively, 11
Is a CPU bus, 13 is a RAM for storing data, and 40 is a ROM for storing instruction codes.

Next, referring to FIG. 7 as well, the operation of the conventional mobile terminal apparatus configured as described above will be described. First, the transmission data 7 input to the baseband processing unit 5 is subjected to processing in the baseband area there. For example, pre-emphasis of audio signals, filtering processing such as compressor, and error correction coding processing of control data are performed when received by analog system, and high-efficiency audio coding of audio signals when received by digital system. , Error correction coding, cryptographic coding, etc., and control data error correction coding, cryptographic coding, etc. are performed. After being processed, it is output as a modulation signal 4 from the baseband processing unit 5, sent to the modulation / demodulation unit 2, modulated to the RF band, and sent from the antenna 1.

On the contrary, in the case of reception, the radio wave received by the antenna 1 is demodulated in the modulation / demodulation section 2 and input to the baseband processing section 5 as a demodulation signal 3. The demodulated signal 3 input to the baseband processing unit 5 is then subjected to, for example, filter processing such as expander and de-emphasis of an audio signal in an analog method, processing for extracting a control signal and correcting an error, and the like. And digitally,
Processing such as cipher decoding and error correction is performed, and if the signal is a voice signal, more efficient voice decoding processing is performed.

The CPU 8 controls the entire mobile terminal device and controls communication with the base station. For example, the control signal 9 is sent to the modulation / demodulation unit 2 to set the used frequency. Similarly, the control signal 10 is sent to the baseband processing unit 5 to set the processing type and exchange control signals. The RAM 13 temporarily stores parameters and the like required for the processing of the CPU 8, and the ROM 40 stores the instruction code of the CPU 8, and the CPU 8 operates in accordance with the instruction code.

As described above, in the conventional example,
Since the system is configured to correspond to each mobile communication system (including, for example, an analog system or a digital system), only the voice signal or data of the mobile communication system suitable for the configuration can be transmitted and received. .

[0008]

However, in the conventional mobile terminal device described above, one mobile terminal device is required for one mobile communication system, and there are many types such as when moving between regions or countries. When it is required to use a plurality of methods to receive the service, it is necessary to have a plurality of mobile terminal devices, and it is unrealistic to carry all of them.

Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a mobile terminal device capable of supporting a plurality of mobile communication systems without having to carry a plurality of mobile communication devices. And

[0010]

A mobile terminal device according to the present invention is basically a CPU in order to achieve the above object.
A parameter (a parameter required for selective processing of a mobile communication system, for example, an analog system or a digital system) is changed to store a baseband processing unit and a modulation / demodulation unit compatible with each system, an instruction code and parameters of the CPU. IC card memory (also called IC card,
In that case, it has a memory part) and a ROM (selectively usable) storing a boot program for transferring the instruction code from the IC card memory to the RAM, and the CPU stores the instruction code in the RAM. The operation is started by the IC for the modulator / demodulator and the baseband processor.
It is characterized in that the parameters stored in the card memory are initialized.

Further, in order to achieve the above-mentioned object, the mobile terminal device according to the present invention has a baseband processing section for performing processing on a transmission / reception signal in a baseband section, and a modulation / demodulation section for performing modulation / demodulation processing on an IF band and an RF band. A mobile terminal device comprising: an antenna for transmitting and receiving radio waves; and a CPU for controlling a modulation / demodulation unit and a baseband processing unit to control communication with a base station. IC card memory that stores the parameters of the modulation / demodulation unit and the baseband processing unit corresponding to the method, RAM that stores the instruction code and parameters transferred from the IC card memory, and the instruction code and parameters that are transferred from the IC card memory to RAM Including a ROM storing a boot program for
U is characterized in that it starts operation by the instruction code stored in the RAM and initializes the parameters stored in the RAM for the modulation / demodulation unit and the baseband processing unit.

Further, in order to achieve the above-mentioned object, the mobile terminal device according to the present invention has a baseband processing section for performing processing on a transmission / reception signal in a baseband section, and a modulation / demodulation section for performing modulation / demodulation processing on an IF band and an RF band. A mobile terminal device comprising: an antenna for transmitting and receiving radio waves; and a CPU for controlling a modulation / demodulation unit and a baseband processing unit to control communication with a base station. An IC card memory storing parameters of a modulation / demodulation unit and a baseband processing unit corresponding to the system, the CPU reads an instruction code from the IC card memory to start an operation, and a mobile communication system specified by the IC card memory. It is characterized in that parameters are initialized to the modulation / demodulation unit and the baseband processing unit. .

Further, in order to achieve the above-mentioned object, the mobile terminal device according to the present invention includes a digital signal processor for processing a transmission / reception signal in a baseband.
A second RAM for storing an instruction code for operating the digital signal processor, a modulation / demodulation unit for performing modulation / demodulation processing on a transmission / reception signal in an IF band and an RF band, and a demodulation signal connected between the modulation / demodulation unit and the digital signal processor for A / D conversion. A / D converter for converting and D / A converting the modulation signal and D / A
A / D converter, a D / A converter for D / A converting a reception signal output from the digital signal processor and an A / D conversion for a transmission signal input to the digital signal processor, and an electric wave An antenna for transmitting / receiving data, a CPU for controlling the modulation / demodulation unit and the digital signal processor to control communication with the base station, an instruction code for the CPU and the digital signal processor for a specific mobile communication system, and a modulation / demodulation unit and a digital corresponding to the system. IC card memory that stores the parameters of the signal processor, and IC
A CPU including a RAM that stores the instruction code and parameters of the CPU transferred from the card memory, and a ROM that stores a boot program that transfers the instruction code and parameters of the CPU from the IC card memory to the RAM
Starts the operation with the instruction code of the CPU stored in the RAM, and outputs the instruction code of the digital signal processor with the second instruction code.
Of the RAM and the parameters stored in the RAM are initialized in the modulator / demodulator.

Further, in order to achieve the above-mentioned object, the mobile terminal device according to the present invention includes a digital signal processor for processing a transmission / reception signal in a baseband.
A second RAM for storing an instruction code for operating the digital signal processor, a modulation / demodulation unit for performing modulation / demodulation processing on a transmission / reception signal in an IF band and an RF band, and a demodulation signal connected between the modulation / demodulation unit and the digital signal processor for A / D conversion. A / D converter for converting and D / A converting the modulation signal and D / A
A / D converter, a D / A converter for D / A converting a reception signal output from the digital signal processor and an A / D conversion for a transmission signal input to the digital signal processor, and an electric wave An antenna for transmitting / receiving data, a CPU for controlling the modulation / demodulation unit and the digital signal processor to control communication with the base station, an instruction code for the CPU and the digital signal processor for a specific mobile communication system, and a modulation / demodulation unit and a digital corresponding to the system. An IC card memory storing the parameters of the signal processor, the CPU reads the instruction code from the IC card memory to start operation, and reads the instruction code of the digital signal processor from the IC card memory and transfers it to the second RAM. , Parameters are read from the IC card memory and the modulator / demodulator is initialized. And it is characterized in Rukoto.

Further, in order to achieve the above-mentioned object, the mobile terminal device according to the present invention has a baseband processing section for performing processing on a transmission / reception signal in a baseband section, and a modulation / demodulation section for performing modulation / demodulation processing on an IF band and an RF band. A mobile terminal device comprising: an antenna for transmitting and receiving radio waves; and a CPU for controlling a modulation / demodulation unit and a baseband processing unit to control communication with a base station. I comprising a memory unit storing parameters of a modulation / demodulation unit and a baseband processing unit corresponding to the system and a dedicated circuit having a partial function of the modulation / demodulation unit I
A C card, a RAM for storing the instruction code and parameters transferred from the memory section of the IC card memory,
R command code and parameters of CPU from memory
The CPU includes a ROM storing a boot program to be transferred to the AM, and the CPU starts operation according to the instruction code stored in the RAM, and the R and R for the modulation / demodulation unit and the baseband processing unit.
Initialize the parameters stored in AM and
It is characterized in that a part of the functions of the modulator / demodulator is specified to a specific mobile communication system via a dedicated circuit of the C card.

Further, in order to achieve the above-mentioned object, the mobile terminal device according to the present invention has a baseband processing section for performing processing on a transmission / reception signal in a baseband section and a modulation / demodulation section for performing modulation / demodulation processing on an IF band and an RF band. A mobile terminal device comprising: an antenna for transmitting and receiving radio waves; and a CPU for controlling a modulation / demodulation unit and a baseband processing unit to control communication with a base station. I comprising a memory unit storing parameters of a modulation / demodulation unit and a baseband processing unit corresponding to the system and a dedicated circuit having a partial function of the modulation / demodulation unit I
Including the C card, the CPU reads the instruction code from the memory section of the IC card to start the operation, reads the parameters from the memory section to initialize the modulation / demodulation section and the baseband processing section, and at the same time, the dedicated circuit of the IC card is provided. It is characterized in that a part of the function of the modulation / demodulation unit is specified to a specific mobile communication system via the above.

[0017]

The mobile terminal device according to the present invention is configured as described above so that the RO terminal can be activated when the power is turned on.
R from IC card memory by M boot program
In order to transfer the instruction code to the AM (this step can be selected) and then start operation with the instruction code so that the baseband processing unit and the modulation / demodulation unit can support a specific mobile communication system. The parameters are set,
After that, the mobile communication system will be adapted. That is, by preparing an IC card memory or an IC card corresponding to each mobile communication system and simply replacing it, a call and a transmission / reception by any mobile communication system are possible.

Further, the mobile terminal device according to the present invention is an IC
ROM that stores a boot program that transfers the instruction code and parameters of the CPU from the card memory to the RAM
By configuring, it is possible to easily and quickly perform initial setting such as parameter setting.

As an embodiment of the present invention, it may be constructed without using a ROM, in which case the circuit becomes simple and inexpensive. Further, in another embodiment, the data processing is simplified by adopting a digital signal processor as the baseband processing unit. Furthermore, in another embodiment, a wider range of modulation / demodulation can be performed by providing the IC card with a dedicated circuit for directly selecting the circuit of the modulation / demodulation unit which cannot be shared by the respective systems.

[0020]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings and FIGS. 1 to 6. 1 is a block diagram showing a configuration of a mobile terminal device according to a first embodiment of the present invention, FIG. 2 is a configuration diagram showing a configuration of a mobile terminal device according to a second embodiment of the present invention, and FIG. The block diagram which shows the structure of the mobile terminal device in a 3rd Example, FIG. 4 is the block diagram which shows the structure of the mobile terminal device in the 4th Example of this invention, FIG. 5 is the 5th Example of this invention. FIG. 6 is a configuration diagram showing the configuration of the mobile terminal device, and FIG. 6 is a configuration diagram showing the configuration of the mobile terminal device according to the sixth embodiment of the present invention.

First, the mobile terminal device according to the first embodiment of the present invention will be described in detail with reference to FIG. FIG.
In FIG. 1, 1 is an antenna, 2 is a modulation / demodulation unit that modulates and demodulates a transmission / reception signal, 3 is a demodulation signal, 4 is a modulation signal, 5 is a baseband processing unit that processes transmission / reception data with a baseband, and 6 is reception data or Received voice, 7 is transmission data or transmitted voice, 8 is CPU, 9 and 10 are control signals for controlling the modulation / demodulation unit 2 and the baseband processing unit 5, respectively.
Reference numeral 11 is a CPU bus, 12 is a ROM storing a boot program for reading an instruction code from an IC card memory, 1
Reference numeral 3 is a RAM for storing data such as instruction codes read from the IC card memory, and 14 is an IC card memory for storing instruction codes corresponding to a particular method.

Next, referring to FIG. 1 as well, the operation of the mobile terminal device according to the first embodiment configured as described above will be described. First, when the power is turned on, the CPU 8
Operates with the boot program stored in the ROM 12, and transfers the contents of the IC card memory 14 (the instruction code and parameters (below) of the CPU 8) to the RAM 13. After the transfer is completed, the CPU 8 starts the operation by the instruction code stored in the RAM 13. At this time, as an initial setting, parameters for controlling the baseband processing unit 5 and the modulation / demodulation unit 2 via the control signals 9 and 10 (mobile communication system,
For example, the parameters necessary for selecting the analog system or the digital system are set. Therefore, thereafter, voice signals and data are transmitted and received by the mobile communication system. The transmission / reception process is the same as the conventional example.

That is, the transmission data 7 is processed by the baseband processor 5 in the baseband processor 5. For example, when received by the analog system, pre-emphasis of the audio signal, filter processing such as compressor, error correction coding processing of control data, etc. are performed, and when received by the digital system, highly efficient audio of the audio signal is received. Processing such as coding, error correction coding, and cryptographic coding, and processing such as error correction coding and cryptographic coding of control data are performed. Then, the transmission data 7 processed by the baseband processing unit 5 is outputted from there as a modulation signal 4 and sent to the modulation / demodulation unit 2. So, IF and R
It is modulated to F band and transmitted from the antenna 1.

On the contrary, the radio wave received by the antenna 1 is demodulated by the modulator / demodulator 2 and input to the baseband processor 5 as a demodulated signal 3. The baseband processing unit 5 performs, for example, filter processing such as expander and de-emphasis of an audio signal in the analog method, processing for extracting a control signal and correcting an error, and digital processing in the encryption method. Processing such as decoding or error correction is performed, and if the signal is a voice signal, further high-efficiency voice decoding processing is performed.

The CPU 8 executes overall control of the mobile terminal device and communication control with the base station. That is, the use frequency is set to the modulator / demodulator 2 via the control signal 9,
Through the control signal 10, the baseband processing unit 5 is used to set the type of processing and exchange control signals.

As can be seen from the above description, according to this embodiment, by replacing the IC card memory,
Various mobile terminal devices of different systems can be easily realized.

Next, the mobile terminal device according to the second embodiment of the present invention will be described in detail with reference to FIG. Figure 2
In FIG. 1, 1 is an antenna, 2 is a modulation / demodulation unit that modulates and demodulates a transmission / reception signal, 3 is a demodulation signal, 4 is a modulation signal, 5 is a baseband processing unit that processes transmission / reception data with a baseband, and 6 is reception data or Received voice, 7 is transmission data or transmitted voice, 8 is CPU, 9 and 10 are control signals for controlling the modulation / demodulation unit 2 and the baseband processing unit 5, respectively.
11 is a CPU bus, 13 is a RAM for storing data, 1
Reference numeral 4 is an IC card memory in which instruction codes each corresponding to a specific method are stored.

Next, referring to FIG. 2 as well, the operation of the mobile terminal device according to the second embodiment configured as described above will be described. In this embodiment, the ROM is not used and the CP
The U8 directly reads the instruction code from the IC card memory 14 and starts the operation even after the power is turned on. At that time, as an initial setting, the control signals 9 and 10 set parameters for the modulation / demodulation unit 2 and the baseband processing unit 5, respectively, which correspond to the mobile communication system used therein. Therefore, thereafter, voice signals and data are transmitted and received by the mobile communication system. The transmission / reception process is the same as the conventional example.

That is, the transmission data 7 is processed by the baseband processor 5 in the baseband processor 5. For example, in the analog system, pre-emphasis of a voice signal, filter processing such as a compressor, and error correction coding process of control data are performed. In the digital system, high-efficiency voice coding, error correction coding of a voice signal, Processing such as cryptographic coding, error correction coding of control data, and cryptographic coding are performed. And
The transmission data 7 processed by the baseband processing unit 5 is output therefrom as a modulation signal 4 and sent to the modulation / demodulation unit 2. Therefore, the antenna 1 is modulated by the IF band and the RF band.
Sent from.

On the contrary, the radio wave received by the antenna 1 is demodulated by the modulator / demodulator 2 and input to the baseband processor 5 as a demodulated signal 3. In the baseband processing unit 5, for example, when receiving in an analog system, a filtering process such as an expander and a de-emphasis of an audio signal, a process of extracting a control signal and correcting an error, and a digital system are performed. When it is received, the process such as the decryption of the cipher or the error correction is performed, and if it is the voice signal, the more efficient voice decoding process is performed.

The CPU 8 executes control of the entire mobile terminal device and communication control with the base station. That is, the use frequency is set to the modulator / demodulator 2 via the control signal 9,
Through the control signal 10, the baseband processing unit 5 is used to set the type of processing and exchange control signals.

As can be seen from the above description, according to this embodiment, by replacing the IC card memory,
Various mobile terminal devices of different systems can be easily realized.

Next, the mobile terminal device according to the third embodiment of the present invention will be described in detail with reference to FIG. FIG.
In FIG. 1, 1 is an antenna, 2 is a modulation / demodulation unit that modulates and demodulates a transmission / reception signal, 3 is a demodulation signal, 4 is a modulation signal, 6 is reception data or reception voice, 7 is transmission data or transmission voice, 8 is a CPU, 9 Reference numerals 10 and 10 are control signals for controlling the modulator / demodulator 2 and the digital signal processor (DSP) 21, respectively, and 11 is a CPU bus.

Further, 12 is a ROM storing a boot program for reading an instruction code from an IC card memory, and 1
3 is a RAM for storing data such as an instruction code read from the IC card memory, 14 is an IC card memory for storing an instruction code corresponding to each specific method, and 20 is an A
A D / D converter and a D / A converter, 21 is a digital signal processor for processing transmission / reception data at a baseband, 2
Reference numeral 2 is a D / A converter and A / D converter, 23 is a second RAM in which instructions of the digital signal processor 21 are stored, 2
Reference numeral 4 is load data loaded from the CPU 8 to the second RAM. That is, in the third embodiment, the baseband processing unit 5 in the first embodiment is replaced by an A / D converter and a D / A converter 20, a digital signal processor 21, a D / A converter and an A / D converter 22. Take the configuration as if it was replaced with.

Next, with reference to FIG. 3 as well, the operation of the mobile terminal device according to the third embodiment configured as described above will be described. First, when the power is turned on, the CPU 8
Operates with the boot program stored in the ROM 12, and transfers the contents of the IC card memory 14 to the RAM 13. After the transfer is completed, the CPU 8 starts the operation by the instruction code stored in the RAM 13. The CPU 8 transfers the instruction code for the digital signal processor stored in the IC card memory 14 to the second RAM 23 via the load data 24. After the transfer is completed, the digital signal processor 21 is activated. Since the instruction code for the digital signal processor corresponds to a specific system, parameter setting corresponding to each system is performed only to the modulation / demodulation unit 2 via the control signal 9. In this way, after the specific method is set, voice signals and data are transmitted and received by the mobile communication method.

During a call, the transmission data 7 is A / D converted by the D / A converter and the A / D converter 22 and then processed by the digital signal processor 21 in the baseband. That is, for example, in the case where the digital signal processor 21 receives the signal in the analog system, pre-emphasis of the audio signal, filter processing such as a compressor, error correction coding processing of the control data, etc. are performed, and the signal is received in the digital system. Performs processing such as high-efficiency speech coding of audio signals, error correction coding, and cryptographic coding, and processing such as error correction coding and cryptographic coding of control data. After that, the output of the digital signal processor 21 is D / A converted by the A / D converter and the D / A converter 20 and output from there as an analog modulation signal 4 and sent to the modulation / demodulation unit 2. So I
It is modulated into an F band and an RF band, and transmitted from the antenna 1.

On the contrary, the radio wave received by the antenna 1 is demodulated by the modulator / demodulator 2 and output as the demodulated signal 3,
After being A / D converted by the / D converter and the D / A converter 20, it is input to the digital signal processor 21. In the digital signal processor 21, for example, in the analog system, filter processing such as expander and de-emphasis of a voice signal or processing such as extracting a control signal and correcting an error is performed, and in the digital system, encryption / decryption is performed. If it is a voice signal, further efficient voice decoding process is performed.

The CPU 8 executes control of the entire mobile terminal device and communication control with the base station. That is, the use frequency is set to the modulator / demodulator 2 via the control signal 9,
Through the control signal 10, processing type setting, control signal exchange, etc. are performed with respect to the digital signal processor 21.

As can be seen from the above description, according to this embodiment, by replacing the IC card memory,
Various mobile terminal devices of different systems can be easily realized.

As a specific configuration, the RAM 23 may be built in the digital signal processor 21, and if the signal input to the digital signal processor 21 is a digital signal, A / D conversion and D / A conversion are omitted. can do.

Next, a mobile terminal device according to the fourth embodiment of the present invention will be described with reference to FIG. The fourth embodiment is similar to the above-described second embodiment in that the ROM 12 is not used. First, the instruction code of the CPU 8 is the ROM 1
Instead of being transferred for use by the second boot program, the CPU 8 is configured to read and operate the instruction code directly from the IC card memory. Since the other points are the same as those of the third embodiment, further description will be omitted.

Next, a mobile terminal device according to the fifth embodiment of the present invention will be described in detail with reference to FIG. Figure 5
In FIG. 1, 1 is an antenna, 2 is a modulation / demodulation unit that modulates and demodulates a transmission / reception signal, 3 is a demodulation signal, 4 is a modulation signal, 5 is a baseband processing unit that processes transmission / reception data with a baseband, and 6 is reception data or Received voice, 7 is transmission data or transmitted voice, 8 is CPU, 9 and 10 are control signals for controlling the modulation / demodulation unit 2 and the baseband processing unit 5, respectively.
Reference numeral 11 is a CPU bus, 12 is a ROM storing a boot program for reading an instruction code from an IC card memory, 1
Reference numeral 3 is a RAM for storing the instruction code of the CPU, parameters and data read from the IC card memory, and 3
Reference numeral 3 is an IC card including a dedicated circuit 34 having a part of the function of the modulation / demodulation unit and a memory unit 35 in which each stores an instruction code corresponding to a specific method. This IC card 33 corresponds to the IC card memory 14 in the first embodiment.

Next, with reference to FIG. 5 as well, the operation of the mobile terminal apparatus according to the fourth embodiment configured as described above will be described. First, when the power is turned on, the CPU 8
Operates with the boot program stored in the ROM 12, and transfers the contents of the memory unit 35 to the RAM 13. After the transfer is completed, the CPU 8 starts the operation by the instruction code stored in the RAM 13. At that time, as an initial setting, the control signals 9 and 10 are used to set parameters for the modulation / demodulation unit 2 and the baseband processing unit 5, respectively, in order to correspond to the mobile communication system used. Therefore, thereafter, voice signals and data are transmitted and received by the mobile communication system.

During a call, the transmission data 7 is processed by the baseband processor 5 by the baseband. For example, when received in the analog system, pre-emphasis of the audio signal, filter processing such as compressor, and error correction coding processing of the control data are performed, and when received in the digital system, high-efficiency audio of the audio signal is received. Processing such as coding, error correction coding, and cryptographic coding, and processing such as error correction coding and cryptographic coding of control data are performed. Then, the transmission data 7 processed by the baseband processing unit 5 is outputted from there as a modulation signal 4 and sent to the modulation / demodulation unit 2. Then, it is modulated into an IF band and an RF band and transmitted from the antenna 1.

Further, in the present embodiment, if the modulator / demodulator 2 has a function (for example, a circuit such as a filter) that cannot be shared by the respective systems, the IC card 33 is provided with a dedicated circuit 34 and a dedicated circuit input is provided. 31 and dedicated circuit output 32
It is possible to automatically specify it to the specific mobile communication system designated by the IC card 33 via.

On the contrary, the radio wave received by the antenna 1 is demodulated by the modulator / demodulator 2 and input to the baseband processor 5 as a demodulated signal 3. The baseband processing unit 5 performs, for example, filter processing such as expander and de-emphasis of an audio signal in the analog method, processing for extracting a control signal and correcting an error, and digital processing in the encryption method. Processing such as decoding or error correction is performed, and if the signal is a voice signal, more efficient voice decoding processing is performed.

The CPU 8 executes overall control of the mobile terminal device and communication control with the base station. That is, the use frequency is set to the modulator / demodulator 2 via the control signal 9,
Through the control signal 10, processing type setting and control signal exchange are performed with the baseband processing unit 5.

As can be seen from the above description, according to this embodiment, it is possible to easily realize various mobile terminal devices of different systems by simply replacing the IC card.

Next, a mobile terminal device according to a sixth embodiment of the present invention will be described with reference to FIG. The sixth embodiment is similar to the above-described second embodiment in that the ROM 12 is not used. First, the instruction code of the CPU 8 is the ROM 1
Instead of being transferred for use by the second boot program, the CPU 8 is configured to read and operate the instruction code directly from the IC card memory. Since the other points are the same as those of the fifth embodiment, further description will be omitted.

[0050]

The mobile terminal device according to the present invention is constructed as described above, and in particular, the command code of the CPU for a specific mobile communication system and the parameters set in the modulation / demodulation unit and the baseband processing unit corresponding thereto are set. I remembered
By installing the C card memory or the IC card, reading the instruction code and the parameter for the desired mobile communication system from the IC card memory or the IC card, executing the instruction code, and setting or changing the parameter, simply By carrying a plurality of IC cards, it is possible to easily support a plurality of mobile communication systems with only one mobile terminal device.

Moreover, even when the same mobile communication system is used, if the function is changed and improved, it is possible to easily deal with it by simply replacing the IC card memory or the IC card.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a configuration of a mobile terminal device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a configuration of a mobile terminal device according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram showing a configuration of a mobile terminal device according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram showing a configuration of a mobile terminal device according to a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram showing a configuration of a mobile terminal device according to a third embodiment of the present invention.

FIG. 6 is a configuration diagram showing a configuration of a mobile terminal device according to a fourth embodiment of the present invention.

FIG. 7 is a configuration diagram showing a configuration of a conventional mobile terminal device.

[Explanation of symbols]

 1 Antenna 2 Modulator / Demodulator 3 Demodulated Signal 4 Modulation Signal 5 Baseband Processor 6 Received Data or Audio Signal 7 Transmitted Data or Audio Signal 8 CPU 9 Control Signal 10 Control Signal 11 CPU Bus 12 Boot ROM 13 RAM 14 IC Card Memory 20 A / D converter and D / A converter 21 Digital signal processor (DSP) 22 D / A converter and A / D converter 23 Instruction RAM 24 Load data 31 Dedicated circuit input 32 Dedicated circuit output 33 IC card 34 Dedicated circuit 35 Memory section 40 Instruction ROM

Claims (6)

[Claims] 1. A baseband processing unit for processing a transmission / reception signal in a baseband, a modulation / demodulation unit for performing a modulation / demodulation process in an IF band and an RF band, an antenna for transmitting / receiving radio waves, the modulation / demodulation unit and baseband processing. A CP for a specific mobile communication system, which is a mobile terminal device comprising a CPU that controls a unit and controls communication with a base station.
An IC card memory that stores the instruction code of U and the parameters of the modulation / demodulation unit and the baseband processing unit corresponding to the same system, a RAM that stores the instruction code and the parameters transferred from the IC card memory, and the IC card R storing a boot program for transferring the instruction code and the parameters from the memory to the RAM
A mobile terminal, including an OM, wherein the CPU starts operation according to an instruction code stored in the RAM, and initializes parameters stored in the RAM to the modulation / demodulation unit and the baseband processing unit. apparatus. 2. A baseband processing unit for processing a transmission / reception signal in a baseband, a modulation / demodulation unit for performing a modulation / demodulation process in an IF band and an RF band, an antenna for transmitting / receiving radio waves, the modulation / demodulation unit and the baseband process. A CP for a specific mobile communication system, which is a mobile terminal device comprising a CPU that controls a unit and controls communication with a base station
An IC card memory storing the command code of U and the parameters of the modulation / demodulation unit and the baseband processing unit corresponding to the same system, and the CPU reads the command code from the IC card memory to start the operation, and the IC A mobile terminal device, wherein a mobile communication system parameter specified by a card memory is initialized to the modulation / demodulation unit and the baseband processing unit. 3. A digital signal processor for processing a transmission / reception signal in a base band area, a second RAM for storing an instruction code for operating the digital signal processor, and a modulation / demodulation processing for the transmission / reception signal in an IF area and an RF area. And a A / D converter connected between the modulator / demodulator and the digital signal processor for A / D converting the demodulated signal and D / A converting the modulating signal, and a D / A
A converter, a D / A converter and a D / A converter for D / A converting a reception signal output from the digital signal processor and A / D converting a transmission signal input to the digital signal processor; An antenna for transmitting and receiving radio waves, a CPU for controlling the modulation / demodulation unit and the digital signal processor to control communication with a base station, an instruction code of the CPU and digital signal processor for a specific mobile communication system, and the modulation / demodulation corresponding to the system. Card and memory for storing parameters of the digital signal processor and RAM for storing the instruction code and parameters of the CPU transferred from the IC card memory
And a ROM storing a boot program for transferring the instruction code and parameters of the CPU from the IC card memory to the RAM, the CPU including the RA
The operation is started by the instruction code of the CPU stored in M, the instruction code of the digital signal processor is transferred to the second RAM, and the parameters stored in the RAM are initialized in the modulation / demodulation unit. A characteristic mobile terminal device. 4. A digital signal processor for processing a transmission / reception signal in a baseband band, a second RAM for storing an instruction code for operating the digital signal processor, and a modulation / demodulation process for the transmission / reception signal in an IF band and an RF band. And a A / D converter connected between the modulator / demodulator and the digital signal processor for A / D converting the demodulated signal and D / A converting the modulating signal, and a D / A
A converter, a D / A converter and a D / A converter for D / A converting a reception signal output from the digital signal processor and A / D converting a transmission signal input to the digital signal processor; An antenna for transmitting and receiving radio waves, a CPU for controlling the modulation / demodulation unit and the digital signal processor to control communication with a base station, an instruction code of the CPU and digital signal processor for a specific mobile communication system, and the modulation / demodulation corresponding to the system. And an IC card memory storing parameters of the digital signal processor, the CPU reads out an instruction code from the IC card memory to start operation, and reads out an instruction code of the digital signal processor from the IC card memory. Transferred to the second RAM and set the parameters to the IC card. Mobile terminal and wherein the de-memory reads that initializing the modem unit. 5. A baseband processing unit for performing processing at a baseband on a transmission / reception signal, a modulation / demodulation unit for performing modulation / demodulation processing on an IF band and an RF band, an antenna for transmitting / receiving radio waves, the modulation / demodulation unit and baseband processing. A CP for a specific mobile communication system, which is a mobile terminal device comprising a CPU that controls a unit and controls communication with a base station
An IC card comprising a memory unit storing the command code of U and the parameters of the modulation / demodulation unit and the baseband processing unit corresponding to the same system, and a dedicated circuit having a partial function of the modulation / demodulation unit, and the memory of the IC card memory A RAM for storing the instruction code and parameters transferred from the memory unit, and a ROM for storing a boot program for transferring the instruction code and parameters of the CPU from the memory unit to the RAM, the CPU including the RAM
The operation is started by the instruction code stored in the RAM, the parameters stored in the RAM are initialized to the modulation / demodulation unit and the baseband processing unit, and one of the modulation / demodulation unit is operated via the dedicated circuit of the IC card. A mobile terminal device, wherein a partial function is specified to the specific mobile communication system. 6. A baseband processing unit for performing processing on a transmission / reception signal in a baseband, a modulation / demodulation unit for performing modulation / demodulation processing in an IF band and an RF band, an antenna for transmitting / receiving radio waves, the modulation / demodulation unit and baseband processing. A CP for a specific mobile communication system, which is a mobile terminal device comprising a CPU that controls a unit and controls communication with a base station
The CPU includes an IC card including a memory unit storing a command code of U and parameters of the modulation / demodulation unit and the baseband processing unit corresponding to the same system and a dedicated circuit having a partial function of the modulation / demodulation unit. The operation code is read out from the memory section of the IC card to start the operation, the parameters are read out from the memory section to initialize the modulation / demodulation section and the baseband processing section, and
A mobile terminal device, wherein a part of the function of the modulation / demodulation unit is specified to the specific mobile communication system via the dedicated circuit of the C card.