JPH0556098A - Mobile body communication equipment - Google Patents

Abstract

PURPOSE:To make the equipment small by implementing individually protocol conversion and line connection processing to each of different communication systems and allowing a data terminal equipment to adopt same signal format and protocol processing. CONSTITUTION:In the case of communication from this mobile body communication equipment 1, a call request signal from the terminal equipment 1 is inputted to a satellite line connector 13 via a changeover device 12, in which format conversion of a call request signal and protocol conversion for line connection by taking satellite propagation delay into account are implemented and a modulation wave after modulation is outputted via a MODEM 15 and an antenna 16 and the wave is sent to an opposite station via a communication satellite 2. After the opposite station confirms enable communication, the station sends a communication enable signal to a mobile body 1. The mobile body 1 processes the signal in the reverse order to above and confirms the output enable signal from a terminal equipment 11 and starts communication. In the case of communication from the opposite station, the mobile body communication equipment 1 receives a signal at an antenna 16 and processes the signal in the reverse order to make communication. When a ground radio line circuit is in use, the connection between the terminal equipment 11 and the line connector 14 is selected by the changeover device 12 and the signal is similarly sent/received. How to use protocol conversion or line connection is not required and miniaturization is attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication device used for a digital communication device or the like.

[0002]

2. Description of the Related Art In most conventional mobile communication devices, a data terminal is integrated with a line connector, or even if it is individual, the connection method and protocol processing are limited. Therefore, it is necessary to use the mobile communication device itself for each different communication method.

[0003]

The above-mentioned conventional mobile communication device has a problem that it is complicated and uneconomical because the device must be used properly for each different communication method.

[0004]

A mobile communication device of the present invention is compatible with a data terminal that exchanges data in the same protocol format in each of different communication systems and one of the different communication systems. A plurality of line connectors for performing protocol conversion and line connection, switching means for selecting one of the plurality of line connectors to connect to the data terminal, and the line connection selectively connected by the switching means. A modulator / demodulator that modulates / demodulates data exchanged with the data terminal via a transmitter and a receiver, and an antenna connected to the modulator / demodulator to perform transmission / reception by different communication systems.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention.

In the figure, first, the operation when the satellite line is used will be described. The use of the satellite line is selected in advance by switching the switch 17. As a result, the switch 12 selects the connection of the data terminal 11 to the satellite line connector 13, and the modulator / demodulator 15 transmits / receives a data signal to / from the data terminal 11 through the satellite line connector 13.

When communication is performed from the mobile communication device 1, a call request is issued from the data terminal 11. Data terminal 1
The call request signal output from 1 passes through the switch 12 and is output to the satellite line connector 13. The satellite line connector 13 performs format conversion of the call request signal and protocol conversion for line connection in consideration of satellite propagation delay, and outputs the processed call request signal to the modulator / demodulator 15. The modulator / demodulator 15 modulates a signal for satellite communication and the antenna 1
The modulated wave after modulation is output to 6 and transmitted to the communication partner station via the communication satellite 2.

After receiving the call request signal, the communication partner station transmits a permission signal indicating permission of communication to the mobile communication device 1 side via the communication satellite 2 after confirming that communication is possible. On the side of the mobile communication device 1, the modulated wave from the partner station is received by the antenna 16, demodulated by the modulator / demodulator 15 and output to the satellite line connector 13. The satellite line connection unit 13 performs format conversion of the permission signal and protocol conversion for line connection in consideration of satellite propagation delay, outputs the processed permission signal to the data terminal 11 through the switch 12, and outputs the permission signal. After confirmation, communication is started.

When communicating from the partner station, the call request signal transmitted by the partner station is received by the antenna 16 via the communication satellite 2 and demodulated by the modulator / demodulator 15 to be connected to the satellite line connector. It outputs to 13. In the satellite line connector 13,
Format conversion and protocol conversion of the call request signal are performed, and the processed call request signal is output to the data terminal 11 through the switch 12. After confirming the call request signal, the data terminal 11 sends a permission signal to the switch 1 if communication is possible.
It outputs to the satellite line connector 13 through 2. The satellite line connector 13 performs format conversion and protocol conversion of the permission signal, and outputs the processed permission signal to the modulator / demodulator 15. The modulated output wave of the modulator / demodulator 15 is transmitted from the antenna 16 and reaches the communication partner station via the communication satellite 2. The partner station starts communication after confirming the received permission signal.

Next, the operation when using the terrestrial radio line will be described. The use of the ground wireless line is selected by switching the switch 17 in advance. Thereby, in the switching device 12,
The connection between the data terminal 11 and the terrestrial line connector 14 is selected, and the modulator / demodulator 15 exchanges a data signal with the data terminal 11 through the terrestrial line connector 14.

When communication is performed from the mobile communication device 1, a call request is issued from the data terminal 11. This call request signal is output to the land line connector 14 through the switch 12. The terrestrial line connector 14 performs format conversion of the call request signal and protocol conversion for line connection in consideration of terrestrial radio, and outputs the processed call request signal to the modem 15. The modulator / demodulator 15 modulates a signal for terrestrial radio communication, outputs the modulated wave to the antenna 16, and transmits the modulated wave to the communication partner station via the terrestrial radio antenna 3.

The communication partner station receiving the call request signal, after confirming that communication is possible, transmits a permission signal indicating communication permission to the mobile communication device 1 side via the ground wireless antenna 3. .. On the side of the mobile communication device 1, the antenna 16
The modulated wave from the partner station is received by the
And demodulates to output to the ground line connector 14. The land line connector 14 performs format conversion and protocol conversion of the permission signal, outputs the processed permission signal to the data terminal 11 through the switch 12, and after confirming the permission signal, communication is started.

When communicating from the partner station, the call request signal transmitted by the partner station is received by the antenna 16 via the ground radio antenna 3, demodulated by the modulator / demodulator 15 and connected to the ground line. Output to the container 14. Ground line connector 1
In 4, the call conversion request signal is subjected to format conversion and protocol conversion, and the processed call request signal is output to the data terminal 11 through the switch 12. After confirming the call request signal, the data terminal 11 outputs a permission signal to the land line connector 14 through the switch 12 if communication is possible. The land line connector 14 performs format conversion and protocol conversion of the permission signal, and outputs the processed permission signal to the modulator / demodulator 15. The modulated output wave of the modulator / demodulator 15 is transmitted from the antenna 16 and reaches the communication partner station via the ground wireless antenna 3. The partner station starts communication after confirming the received permission signal.

In the present embodiment, protocol conversion and line connection processing for satellite communication signals and protocol conversion and line connection processing for terrestrial wireless communication signals are performed individually, and the signal format and line connection processing are performed on the data terminal connection side. By making the protocol processing the same on the satellite side and the ground side,
It is not necessary to use each communication method differently as in the conventional device.

[0016]

As described above, according to the present invention, protocol conversion and line connection processing are individually performed for each different communication method, and the signal format and protocol processing are performed by any method on the data terminal connection side. By making them the same, it is not necessary to use each communication system differently as in the conventional device, and by making it possible to integrate the devices, it is possible to reduce the size and cost of the device.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1 Mobile Communication Device 2 Communication Satellite 3 Terrestrial Radio Antenna 11 Data Terminal 12 Switcher 13 Satellite Line Connector 14 Terrestrial Line Connector 15 Modulator / Demodulator 16 Antenna 17 Switch

Claims (1)

[Claims] 1. A data terminal for exchanging data in the same protocol format in any of different communication systems,
A plurality of line connectors each of which performs protocol conversion and line connection corresponding to one of different communication systems;
Switching means for selecting one of the plurality of line connectors and connecting to the data terminal, and modulation / demodulation of data exchanged with the data terminal via the line connector selectively connected by the switching means. A mobile communication device comprising a modulator / demodulator and an antenna connected to the modulator / demodulator for transmitting and receiving in different communication systems.