JP2000068921A - Portable mobile object satellite communication terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect a plurality of cellular channels to a public communication line network via a satellite in addition to a communication function and to improve practicality by adding a multi-channel unit to a mobile satellite terminal and giving a repeating function. SOLUTION: The digital cellular interface 4 of a multi-channel unit, which is constituted of the interfaces 62 of a plurality of personal digital cellular channels PDC.CH, a multiplex/separation part 61 and an antenna 5, is connected to the signal processing part 52 of a satellite terminal 1 through the multiplex/ separation part 61. When a call is given from PHS and the like, the allocated interface 62 is started and a connection request signal is sent from the signal processing part of the interface 62 to the satellite terminal 1. The satellite terminal 1 sets a satellite line and it is connected to a ground exchange station via a satellite earth station. A response signal from the exchange station is demodulated in DEM:57, is signal-processed in the signal processing part 52 and is outputted via the interfaces 62. Thus, PHS can realize a regular call.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable mobile satellite communication terminal, and more particularly, to a multiple access portable mobile satellite communication terminal.

[0002]

2. Description of the Related Art A portable mobile satellite communication terminal (hereinafter referred to as a satellite terminal) is a portable telephone terminal (cellular) or P
It is an ultra-compact portable satellite communication terminal, similar to an HS (personal handy phone system: simplified mobile phone) terminal. Carry it to the point where you want to use it, install it there, point the antenna at the satellite, or move while moving to the public communication network or other mobile (terrestrial and satellite)
Communication, facsimile (FAX) communication, data communication, and the like.

As shown in FIG. 5, Japanese Patent Application Laid-Open No. 5-183489 has a movable base station 50 as a system, and a radio zone (BS; base station) 20 of a specific base station (BS; base station) 20 when a disaster or the like occurs. Service area), a number of mobile stations (MS; mobile phones or PHS terminals) 10
Is concentrated, calls are made, and an overflow call (congestion) occurs, the mobile base station (MBS) 50 is dispatched to the wireless zone where the overflow call has occurred, and operates together with the fixed base station 20. A configuration method has been proposed.

Further, a satellite communication line for connecting the mobile base station 50 and the exchange 30 of the public communication network 31 via an antenna 34, a communication satellite 2, an antenna 33, and a radio station (ES) 32 is provided. Overflow calls of a large number of mobile stations 10 occur in the radio zone of a certain base station 20, and the base station 20 connects to a terrestrial line 40 for connecting to the exchange 30 of the public network 31.
Is congested, the terrestrial line 4
0 and a satellite communication line are used.

[0005] When a mobile base station 50 newly provided as a system generates an overflow call due to an outgoing / incoming call of a large number of mobile stations 10 at a fixed base station 20 in a certain radio zone, the overflow call occurs. Dispatched to the wireless zone. Then, incoming and outgoing calls of the fixed base station 20 and a number of mobile stations 10 concentrated in the wireless zone are shared and relieved.

Further, when a newly provided satellite communication line overflows a number of mobile stations 10 to a fixed base station 20 in a certain radio zone, the dispatched movable base station 50 and the public network are connected. 31 exchanges 30 are connected via satellites. In addition to the ground line 40 between the fixed base station 20 and the exchange 30 of the public network 31, the incoming and outgoing calls of a large number of mobile stations 10 are shared and processed in order to eliminate line congestion. The overflow call of the station 20 is reduced and relieved.

[0007]

SUMMARY OF THE INVENTION FIG.
In the case of the proposal described in Japanese Patent No. 183489, a movable base station exists only to cope with a temporary increase in traffic in an emergency, and a cellular base station using a satellite line instead of a fixed base station ( (Mobile phone terminal) only backup to the user. In addition, the mobile base station is a relay station to the last, and does not have a telephone call function. This limits their use.

An object of the present invention is to provide a portable mobile satellite communication terminal having a backup function and a call function.

[0009]

SUMMARY OF THE INVENTION A portable mobile satellite communication terminal according to the present invention is a portable mobile satellite communication terminal connected to a public communication network via a communication satellite and a satellite terrestrial base station, It is characterized by including a mobile telephone relay means for relaying the mobile telephone terminal wirelessly.

The operation of the present invention is as follows. By using a portable mobile satellite communication terminal, miniaturization and weight reduction can be achieved. Using a handset of a satellite terminal as a base unit, a mobile phone (mobile) terminal such as a PHS can be treated as a slave unit. PDC (Personal Digital Cellular; Mobile Phone Terminal) By adding a CH (channel) interface and a demultiplexing / multiplexing circuit, a single satellite terminal can use (configure) a plurality of communication lines. It can be hand-carried and can be installed anywhere as long as the communication satellite can be seen.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of a portable mobile satellite communication terminal according to the present invention, and the same parts as those in FIG. 5 are denoted by the same reference numerals. In FIG. 1, a communication system in which a portable mobile satellite communication terminal 1 according to the present invention is related includes a satellite ground base station 7 communicating with the portable mobile satellite communication terminal 1 via a communication satellite 2, and a satellite communication line. And a portable mobile satellite communication terminal 1 and a digital cellular (phone) (mobile phone terminal) 10 forming a communication line by, for example, a personal handyphone system.

A (portable mobile) satellite (communication) terminal 1 according to the present invention includes a satellite antenna 3 for transmitting and receiving radio waves from (or to) a communication satellite 2, and a handset 1 for talking.
1, a digital cellular interface 4 forming a communication line with the digital cellular 10, and an antenna 5 for performing wireless transmission and reception with the digital cellular 10 are added.

The operation of the embodiment of the present invention will be described. In FIG. 1, a portable mobile satellite communication terminal 1 having a communication channel of one channel (CH), a facsimile (FAX) communication function, and a data communication function is provided with a plurality of digital cellular (PHS) 10 or the like. , The satellite terminal 1 is regarded as a temporary base station, and a PHS or the like can be used outside the terrestrial cellular area. As shown in FIG. 2, the satellite terminal 1 includes a signal processing unit 52 for processing a communication signal with the handset 11 or the digital cellular 10, a modulation unit (MOD) 53 for modulating the communication signal to an intermediate frequency, and a micro-communication for satellite communication. Frequency converter (U / C) 5 for up-converting to wave signal
4

A high-power amplifier (HPA) for transmission 5
9, an antenna 3 for transmission / reception to / from the satellite 2, a duplexer (DUP) 58 for combining / separating transmission / reception signals, and a low-noise amplifier (LNA) 55 for amplifying a reception signal via the satellite 2. Further, it includes a frequency converter (D / C) 56 for down-converting the received signal to an intermediate frequency, a demodulator (DEM) 57 for demodulating the received signal into a speech signal, and a handset interface 51 for interfacing with the handset 11. .

A multi-channel unit (digital cellular interface) 4 having an additional configuration includes a multiplexing / demultiplexing unit 61 for multiplexing or demultiplexing a plurality of cellular channels, a PDCCH (cellular channel) interface unit 62 corresponding to each cellular channel, Cellular antenna 5
It is composed of The signal processing unit 52 in the satellite terminal body 1 and the multiplexing / demultiplexing unit 61 in the multi-channel unit 4 are connected.

FIG. 3 is a detailed block diagram of the PDC CH interface 62. The signal received from the common antenna 5 is amplified by the LNA unit 68 via the duplexer (DUP) 67, demodulated by the DEM unit 69, and demodulated by the signal processing unit 6.
4 and further to the multiplexing / demultiplexing interface 63. A signal from the multiplexing / demultiplexing unit 61 via the multiplexing / demultiplexing interface 63 passes through a signal processing unit 64,
After passing through the MOD unit 65 and the HPA unit 66, the combining unit 67
, And transmits radio waves to a digital cellular device 10 such as a PHS terminal.

As shown in FIG. 4A, the signal processing unit 52 normally receives an input f from a voice switching circuit, which is a part of the circuit of the signal processing unit 52 inside the satellite terminal 1, from the handset 11, and modulates the signal. Side output d, the DEM57 side output b is connected to the handset 11 input e and the satellite terminal 1
Talking on.

FIG. 4B shows the switching of the audio signal of the signal processing unit 52 in the satellite terminal 1 when a digital cellular, for example, a personal handy phone system 10 is used. When a call is made from the digital cellular 10, the assigned PDCCH interface 62 in the additional configuration 4 is activated, and a connection request signal is sent from the signal processing unit 64 of the PDCCH interface 62 to the satellite terminal 1. PDC C
The signal input from the upstream c side of the H interface 62 is output to the output d on the MOD 53 side as it is. The satellite terminal 1 sets a satellite line and is connected to a ground exchange via a satellite earth station 7. The exchange returns a response signal, which is input from the input b on the DEM 57 side and output to the output a of the PDCCH interface, so that the digital cellular 10 can perform a normal call.

The satellite terminal 1 disconnects the satellite line when the telephone line is not used, so that it can be operated economically without wasteful costs. Local communication is also possible, and the satellite terminal 1 can be called from the (accommodated) digital cellular 10, or vice versa, or a conference (telephone) between a plurality of digital cellular 10 and the satellite terminal 1 is possible.

FIG. 4C shows a signal processing unit 5 in the satellite terminal 1.
2 shows switching of audio signals. Digital cellular 1
0, the signal processing section 52 of the satellite terminal 1
The CCH interface 62 is connected to the handset input e from the upstream c side, and is not connected to the satellite line for setting, but is directly connected to the handset interface unit 51 to call the handset 11. Handset 11 output f is PDC
The audio signal of the handset 11 is transmitted to the digital cellular 10 by being connected to the downstream a side of the CH interface 62.

The portable mobile satellite communication terminal according to the present invention can be reduced in weight and size, does not require any special means for carrying, and cannot be used not only outside the cellular area but also in ordinary terrestrial communication. Installation and operation can be easily performed if communication satellites can be seen even in places where no vehicles can enter, and multiple cellular phones can be used in the vicinity.

[0022]

As described above, the present invention accommodates a plurality of cellular channel lines in addition to its own communication function by adding a multi-channel unit, and provides a public communication line network via a satellite. There is an effect that can be connected to. In addition, there is an effect that a local call can be made between the satellite terminal to which the multi-channel unit is added and the accommodated (connected) cellular.

[Brief description of the drawings]

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

FIG. 2 is a detailed block diagram of an embodiment of the present invention.

FIG. 3 is a detailed block diagram of a multi-channel unit.

FIG. 4 is an explanatory diagram of audio signal switching.

FIG. 5 is a block diagram of an example of a conventional cellular system.

[Description of Signs] 1 Portable mobile satellite communication terminal 2 Communication satellite 3 Satellite communication antenna 4 Digital cellular interface 5 Antenna 7 Satellite ground base station 10 Digital cellular 11 Handset

Claims (4)

[Claims] 1. A portable mobile satellite communication terminal connected to a public communication network via a communication satellite and a satellite terrestrial base station, comprising mobile phone relay means for wirelessly relaying the mobile phone terminal. A portable mobile satellite communication terminal characterized by the following. 2. The portable mobile satellite communication terminal according to claim 1, wherein said portable telephone terminal includes a simplified portable telephone terminal. 3. The portable mobile satellite communication terminal according to claim 1, wherein the terminal is directly connected to the public communication network using a handset. 4. A portable mobile satellite communication terminal according to claim 1, wherein said portable communication satellite network exchanges and connects said plurality of portable telephone terminals with said handset. .