JPH01175419A - Satellite/moving body communication system - Google Patents

Abstract

PURPOSE:To replace the long-distance line part of a ground line with a satellite line and to reduce the charge for the ground line by installing satellite communication state in respective subscriber exchanges and allowing a mobile station to access directly the satellite communication ground station of the subscriber exchange which includes a subscriber who wants to make a call. CONSTITUTION:For example, a moving body communication device 20 wants to call a subscriber 50 and a moving body communication device 21 wants to call a subscriber 52. In this case, the moving body communication device 20 accesses directly a satellite line dedicated to a subscriber exchange 30 which includes this subscriber to make a communication for calling the subscriber 50. Therefore, this call is made only through the ground line between the subscriber 50 and subscriber exchange 30, so the charge for the ground line is minimized. When the moving body communication device 21 calls the subscriber 52 52 included in the subscriber exchange 32, the charge for the ground line is also minimized similarly.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a mobile communication system using satellites.

[Conventional technology and its problems]

Inmarza Soto (INMAR3A) is a satellite-based mobile communication service that connects to public networks.
T: International Mari
time Satellite Organizati
on) is the only one. Connection between this system and the public network is made through a satellite communication gateway station located at an upper level of the public network.

The advantage of this system is that only one ground station is required on the public network side. On the other hand, problems arise when such a system is applied to a domestic system. In other words, if we consider car telephones, even if a mobile station wants to make a call to a fixed subscriber in the same city, it will have to make a detour through the satellite line and a distant satellite communication barrier station, and the land line will be long. Since it is a distance call, you can no longer expect cheap call charges.

An object of the present invention is to provide a satellite mobile communication system that solves these problems.

[Means for solving problems]

The satellite mobile communication system of the present invention comprises: a plurality of subscriber switching stations each having two stations, each having its own dedicated satellite communication site, and each having a dedicated satellite line exclusively allocated to other stations; a mobile communication device that communicates with a subscriber accommodated in one of the subscriber exchanges; the mobile communication device communicates with a subscriber exchange accommodated in the subscriber exchange; , is characterized in that it is directly connected to the public network using the dedicated satellite line owned by this subscriber exchange.

[Effect]

According to the invention, a satellite communications ground station is installed at each subscriber exchange, and a mobile station directly accesses the satellite communications ground station of the subscriber exchange in which the subscriber with whom it wishes to make a call is accommodated. This will replace the long-distance terrestrial line with a satellite line, significantly reducing terrestrial line charges.

The reason why such a method has not been devised in the past is that the satellite's transmission power is insufficient and the ground station is small.

This was due to the difficulty of economicization. However, in recent years, as satellites have become larger and more powerful, and reception technology has improved, it has become possible to downsize ground stations, making this method possible.

〔Example〕

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

This satellite mobile communication system consists of subscriber switching centers 30°31,
3.2, each subscriber exchange has a dedicated satellite communication station for the satellite 1 and a dedicated satellite line.

These subscriber exchanges are relay exchanges 40 of a higher hierarchy.
．． They are interconnected by land lines via 41.42.43.44.45.

Also, each subscriber exchange 30.31.32 has subscriber 50
゜5L 52 are accommodated respectively.

Furthermore, a mobile communication device 20゜21 capable of communicating with the satellite 1
have.

In the satellite mobile communication system configured as described above, it is assumed that the mobile communication device 20 desires to communicate with the subscriber 50, and the mobile communication device 21 desires to communicate with the subscriber 52.

In this case, in order to communicate with the subscriber 50, the mobile communication device 20 performs communication by directly accessing the satellite line dedicated to the subscriber exchange 30 in which the subscriber is accommodated.

Therefore, since this call only goes through the terrestrial line between the subscriber 50 and the subscriber exchange 30, the terrestrial line charge can be minimized.

Similarly, land line charges can be minimized for calls between the mobile communication device 21 and the subscriber 52 accommodated in the subscriber exchange 32.

Furthermore, each mobile communication device is housed in a single subscriber exchange in advance, and receives an incoming call signal from the subscriber exchange to which it belongs except during a call. For example, mobile communication device 20
For example, if the mobile communication device 20 is accommodated in the local switching center 31, incoming calls to the mobile communication device 20 are routed to the local switching center 31, so the mobile communication device 20 always accepts incoming calls from the local switching center 31. Pay attention to the call signal.

Usually, a mobile communication device is housed in a local subscriber exchange office where it is permanently stationed, so even in this case, the cost of the terrestrial link is probabilistically minimized.

〔Effect of the invention〕

As explained above, according to the present invention, a mobile communication system that minimizes terrestrial line charges is realized.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention. 1...Satellite 30, 3L 32...Subscriber exchange 20, 21...Mobile communication device 50, 51.52...subscriber 40, 41.42° 43, 44.45...Relay exchange Agent Patent Attorney Yoshiyuki Iwa Figure 1

Claims (2)

[Claims] (1) A plurality of subscriber exchanges, each having its own dedicated satellite communication ground station, and each having a dedicated satellite line exclusively assigned to other stations, and any one of said subscriber exchanges; The mobile communication device has a mobile communication device that communicates with the subscriber accommodated therein, and the mobile communication device has a subscriber switching center in which the subscriber with whom it communicates is accommodated, and a mobile communication device that communicates with the subscriber accommodated therein. A satellite mobile communication system that is characterized by being directly connected to a public network using a dedicated satellite line. (2) Claim 1 characterized in that the mobile communication device is housed in one subscriber exchange in advance and receives an incoming call signal from the subscriber exchange to which it belongs except during a call. Satellite mobile communication method described.