JPH0761175B2 - Mobile communication complex system - Google Patents

Description

The present invention relates to a mobile communication complex system using a communication satellite.

[Prior Art] A conventional mobile communication system is not a composite of a plurality of services. For example, as shown in the connection diagram of the conventional car telephone system of FIG. 2, each car service is provided as a separate system, such as a car telephone only in the car telephone system. Then, the exchanges 1 that perform those services and the exchanges 1
The radio base station 2 and the radio base station 2 were connected to each other by a ground line such as a normal cable, a microwave line, or an optical cable.

[Problems to be Solved by the Invention]

The above-described conventional mobile communication systems are provided as independent systems, respectively, and connect the exchanges with each other and the exchanges with the radio base stations by terrestrial lines. And, to expand the range of service, we have made connections via multiple exchanges, and as a method for continuing mobile phone calls, "inter-exchange roaming" etc. are used. In order to realize the control, there is a problem that complicated control using a data line is required between a plurality of exchanges through which calls are being connected, and the car telephone system and the maritime satellite system Since they are separate systems, there is a problem in that each system must be equipped even if the call volume is small. If the service is implemented by a single exchange to solve this problem, the installation location of each system is usually far away, and a long-distance relay line to each system is required, which impairs economic efficiency. There is a problem that Similarly, in a country with a small population or a large number of small islands with respect to the size of the land, it is practically difficult to install a ground line.

It is an object of the present invention to provide a satellite link between an exchange and a radio base station so that a single exchange can serve a wide area, and a single system can be used for a car telephone system or a maritime satellite system. Another object of the present invention is to provide a mobile communication complex system that can also serve a rural communication system.

[Means for Solving the Problems]

The mobile communication system of the present invention controls a plurality of systems including a car telephone system, a maritime satellite system, and a rural communication system in which a plurality of subscriber terminals are connected to each other via a wireless line to make a call, And a switching center including a single exchange having a function of performing a call connection operation between the respective systems and a radio transceiver connected to the exchange, and a radio base station provided in the exchange and the respective systems. And a communication satellite connected to each other by a satellite link.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

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

The exchange 1 is a radio transceiver for the exchange 11 and the satellite link 21.
It consists of 12 and. The communication satellite 2 connects the switching center 1 and the radio base stations 3 which are distributed and installed in various places by a satellite link 21. Radio base station 3 is a satellite link
It comprises a wireless transceiver 31 for 21 and a wireless transceiver 32 connecting between the subscriber terminal 4 in the service area.

Next, the operation will be described.

When a subscriber of the exchange 1 (not shown) communicates with the subscriber terminal 4, the exchange 11 connects to the communication satellite 2 via the wireless transceiver 12 and the satellite link 21, and further connects the satellite link 21. The wireless transmitter / receiver 31 is connected to the subscriber terminal 4 via the carrier frequency conversion. The same connection is made in the case of a call from the subscriber terminal 4. By doing this, whether it is a car telephone system or a maritime satellite system,
Alternatively, even a rural communication system can be accommodated in the same system and can be serviced by a single exchange.

〔The invention's effect〕

As described above, according to the present invention, by connecting a satellite link between a switching center and a radio base station, a wide area can be served by a single switching center, and a mobile telephone system can be realized by a single system. It also has the effect that it will be possible to provide services such as a maritime satellite system and a rural communication system.

[Brief description of drawings]

FIG. 1 is a connection diagram of an embodiment of the present invention, and FIG. 2 is a connection diagram of a conventional car telephone system. 1 ... Exchange station, 2 ... Communication satellite, 3 ... Radio base station, 4
…… Subscriber terminal, 11 …… Exchange, 12, 31, 32 …… Wireless transceiver, 21 …… Satellite link.

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical indication location H04Q 7/26 7/30 7/38 7605-5K H04B 7/26 A

Claims (1)

[Claims] 1. A plurality of systems including a car telephone system, a maritime satellite system, and a rural communication system in which a plurality of subscriber terminals are connected to each other via a wireless line to make a call, respectively, are integrated into each system and each of the systems. Between a switching center including a single switching center having a function of performing a call connection operation between systems and a wireless transceiver connected to the switching center, and between the switching center and a wireless base station provided in each system. A mobile communication complex system, comprising: