JPH11285047A - Method for accommodating each portable terminal to public network - Google Patents

Abstract

PROBLEM TO BE SOLVED: To establish mobile communication even in an area where a public network is not arranged at all by economically accommodating each portable terminal in the area to a public network. SOLUTION: Each of portable terminals 60-1-60-n is temporarily accommodated in a base station 40 incorporated with a mobile repeater 70, which is placed at an optional position via a radio interface, whereas a satellite communication controller 20 is accommodated in a public network interface 11. And in the case of conducting 2-way data communication through a satellite channel 100 via a communication satellite 30 between the controller 20 and the repeater 70, mobile communication is available among the portable terminals 60-1-60-n in an area where a public network is not arranged at all.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable terminal in which each portable terminal is temporarily accommodated in a base station via an existing wireless interface and then accommodated in a public network via a satellite line and a public network connection device in sequence. It is related to the method of accommodation in each public network.

[0002]

2. Description of the Related Art A conventional mobile communication system is described in "Mobile Communication Handbook" (November 15, 1995).
As described in “Ohm Co., Ltd., Japan”, each base station for wireless communication is fixedly installed. Therefore, each base station is immobilized by itself, and the public network connection device is connected to the base station. It is housed in public networks and digital networks.

[0003] Apart from the above, the above-mentioned known literature also discloses a mobile communication system that can be used without being aware of the base station, such as a small-sized mobile communication system using a communication satellite called an N-STAR mobile communication system. It also describes the telephone.

[0004]

However, in conventional portable mobile communication systems, the location of each base station is limited to an area where a public network or a digital network is provided. The failure cannot be denied. That is, a base station in a fixed installation state becomes unusable due to, for example, a disconnection occurring on a public network accommodating the base station due to an accident or a disaster, or a case where a switchboard becomes congested. If you put it,
The mobile terminals existing as mobile stations existing within the coverage area of the base station are no longer able to perform their original mobile communication functions. In addition, when a new base station is installed in order to cope with a temporary shortage of the number of mobile communication lines at the time of holding an event, etc., not only is it costly to install it, but also the event etc. Once completed, the operation and maintenance of the base station will require many operating costs.
Further, the most worrisome problem is that mobile terminals are located outside the coverage area of each existing base station or in areas where it is difficult to install new base stations due to inadequate public networks and other communication networks. Each of them is completely unusable, and a lot of cost is required to install a new base station.

[0005] On the other hand, in the case of the N-STAR mobile communication system, the terminal device itself is expensive and large in comparison with the existing portable terminal, and it is necessary to fix the antenna surface in the satellite direction. If mobility and operability are poor and more than one terminal device is required for communication, a satellite line must be allocated to each terminal device, and the utilization efficiency of satellite communication equipment and satellite lines can be improved. The fact is that there is nothing.

An object of the present invention is to allow a base station to be installed at an arbitrary position even in an area where a public network is not provided at all, and to allow each portable terminal in the area to be economically connected to the public network. The purpose of the present invention is to provide a method for accommodating each portable terminal that can be accommodated in a public network.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a portable terminal, which is arbitrarily movable, is temporarily housed in a base station via an existing wireless interface, and is then housed in a public network via a public network connection device. A method for accommodating each mobile terminal in a public network, wherein a base station arbitrarily movable and installable is connected to a mobile communication repeater for satellite communication integrated with the base station via an existing digital interface. On the other hand, the satellite communication control device is housed in a public network connection device via an existing digital interface, and the satellite communication communication control device and the satellite communication mobile repeater are connected via a satellite line via a communication satellite. This is achieved by sending and receiving data in both directions.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a mobile communication system according to the present invention will be described below with reference to FIGS. First, the overall schematic system configuration of the mobile communication system in one embodiment with reference to FIG. 1 is as follows.

In other words, the public network 10 is assumed to be an existing one, and generally includes a general subscriber (telephone), a private branch exchange (PBX), a public network connection device 11 for mobile radio communication, and the like. It has been contained. As shown in the drawing, the difference in the system configuration from that of the prior art is that in the prior art, the base station 40 for wireless communication is directly connected to the public network 11 via the public network connection device 11.
However, in the present invention, the base station 4
Numeral 0 is housed in the public network 11 via the mobile repeater 70, the communication satellite 30, the satellite communication control device 20, and the public network connection device 11. In other words, as compared with the existing system configuration, between the base station 40 and the public network connection device 11,
The mobile repeater 70, the communication satellite 30, and the satellite communication control device 20 are provided as new components.

Here, the main components in the above system configuration will be described. In the public network connection device 11 for controlling the line connection between the base station 40 and the public network 10, the public network connection device 11 in the conventional mobile communication system is used. And an existing digital interface 80 as a public network connecting device-base station interface system that can be directly connected to the base station 40. The public network connecting device 11 accommodates the satellite communication control device 20 by this interface. Has become. Also,
Although the configuration of the satellite communication control device 20 will be described later with reference to FIG. 2, the satellite communication control device 20 has a satellite communication transmission / reception function including an antenna, and is accommodated in the public network connection device 11 by the existing digital interface 80. In addition, it is provided with a format conversion function for converting the satellite line format data into the existing digital interface format data and a reverse format conversion function.

On the other hand, the mobile repeater 70 is formed integrally with the base station 40 and can be arbitrarily installed. The configuration of the mobile repeater 70 will be described later with reference to FIG. The mobile repeater 70 has a transmission / reception function for satellite communication including an antenna. The base station 40 is accommodated by the existing digital interface system 80, and a format conversion function from satellite line system format data to existing digital interface format data is provided. And its inverse format conversion function. Further, the base station 40 constitutes a mobile station group 50 together with digital communication portable terminals (mobile stations) 60-1 to 60-n (n: number of communicable lines) having an antenna and a transmission / reception data processing function. However, each of the mobile terminals 60-1 to 60-n is accommodated in the base station 40 via the existing wireless interface 90, as in the previous cases.

In the past, information has been transmitted and received directly between the public network connection device 11 and the base station 40. However, according to the above system configuration, the information is transferred to the mobile relay station 7.
0, transmitted and received via the satellite line 100 and the satellite communication control device 20. Arbitrary mobile installation of the mobile repeater 70 and the base station 40 is enabled by the intermediate intervention of the satellite line 100. As will be described later with reference to FIG. 4, on the satellite line 100, in addition to the data exchanged between the base station 40 and the public network connection device 11, the satellite line 10
Control of 0 and additional codes for satellite links such as error correction codes are added.

Here, the configuration of the satellite communication control device 20 will be described. As shown in FIG. 2, the satellite communication control device 20 includes a transmission / reception control unit 21, a data separation unit 22, a data multiplexing unit 23, a downlink speed conversion unit. 24, the upstream speed conversion unit 25,
Downlink data modulator 26, uplink data demodulator 27, satellite transceiver 28, and public network interface 2
9. In this case,
The transmission / reception control unit 21 generates the satellite channel additional code 101 used in the satellite communication control, and outputs the satellite network additional code 101 and the public network downlink data 200 from the public network connection device 11 to the base station 40. Multiplexing control, separation control of received data from the satellite line 100 in a state where the additional code 101 for the satellite line and the public network upstream data 201 from the base station 40 to the public network connection device 11 are multiplexed. It has become a thing. Specifically, the public network downlink data 200 from the public network connection device interface 29 is multiplexed and framed by the satellite channel additional code 101 from the transmission / reception control unit 21 and the data multiplexing unit 23 via the downlink speed conversion unit 24. In addition, the data is transmitted from the satellite transmitting / receiving device 28 to the satellite line 1100 via the downlink data modulating unit 26. On the other hand, data from the satellite link 100 (multiplexed data of the satellite link additional code 101 and the public network uplink data 201) is received by the satellite transmitting / receiving device 28, and then transmitted to the data separating section 22 through the uplink data demodulating section 27. , The satellite network additional code 101 to the transmission / reception control unit 21 and the public network upstream data 201 are separated from each other. The public network upstream data 201 is further transmitted from the public network connection device interface 29 via the upstream speed conversion unit 25. This is transmitted to the public network connection device 11.

Continuing with the description of the configuration of the mobile repeater 70, as shown in FIG. 3, the mobile relay station 40 includes a downlink control unit 71, an uplink control unit 72, and a data multiplexing unit 7.
3-a, data separating section 73-b, base station connection interface 74, satellite transmitting / receiving apparatus 75, downlink speed converting section 7
6, an up speed converter 77, a down data demodulator 78, and an up data modulator 79. In this case, after the data from the satellite link 100 is received by the satellite transmitting / receiving device 75, the data separating unit 73-b sends the data through the downlink data demodulating unit 78 to the downlink control unit 7-b.
1 for satellite link to base station 1 and base station downlink data 3
After being separated into 00, the base station downlink data 300 is further transmitted from the base station connection interface 74 to the base station 40 via the downlink speed converter 76.
On the other hand, data from the base station 40 is transmitted to the data multiplexing unit 73 through the base station connection interface 74 and the uplink speed conversion unit 77.
In -a, the additional code 1 for the satellite link from the uplink control unit 72
01 and multiplexed / framed, and the uplink data modulating unit 7
9 via the satellite transmission / reception device 75 on the satellite line 100.

Finally, the state of the line connection between the public network connection device 11 and the base station 40 will be described with reference to FIGS. 2 to 4. That is, FIG. 4 shows an example of the line connection state. In this case, in the downlink direction, the public network downlink data 200 from the public network connection device 11 is transmitted to the satellite communication control device 20. If
The public network downstream data 200 is first transmitted to the downstream speed converter 24.
After the speed conversion by the satellite transmission / reception device 2, the data is multiplexed by the satellite channel additional code 101 from the transmission / reception control unit 21 and the data multiplexing unit 23, and transmitted via the downlink data modulation unit 26.
8 is transmitted over the satellite line 100. At this time, the public network downlink data 200 transmitted from the public network connection device 11 as time t corresponds to the satellite line 1
In 00, the down-speed conversion unit 24 converts the speed into high-speed data so as to correspond to the time t in a state of being multiplexed with the satellite line additional code 101. Now, after the data from the satellite line 100 is received by the satellite transceiver 75 in the mobile repeater 70, the downlink data demodulator 7
After being demodulated at 8, the data is separated into the public network downstream data 200 and the satellite channel additional code 101 by the data separation unit 73-b. Of these, the separated satellite channel additional code 101 is processed in a predetermined manner by the downlink control unit 71, but the public network downlink data 200 is converted by the downlink speed conversion unit 76.
Is speed-converted to low-speed data, and the base station downlink data 3
00 as the base station connection interface 74 to the base station 4
0.

On the other hand, in the uplink direction, the base station 4
In the mobile repeater 70, the base station uplink data 301 is speed-converted into high-speed data by the uplink speed converter 77, and then the satellite channel additional code 1 from the uplink controller 72 is transmitted.
01 is multiplexed by the data multiplexing unit 73-a and transmitted from the satellite transmitting / receiving device 75 to the satellite line 100 via the upstream data modulating unit 79. At this time, the base station uplink data 301 transmitted from the mobile repeater 70 as time t minutes is subjected to an uplink speed conversion so as to be equivalent to the time t in a state of being multiplexed with the satellite channel additional code 101 on the satellite channel 100. The data is converted into high-speed data by the unit 77. Now, the data from the satellite line 100 is transmitted to the satellite transceiver 2 in the satellite communication controller 20.
8, the data is demodulated by an uplink data demodulation unit 27, and then separated by a data separation unit 22 into a satellite channel additional code 101 and a public network uplink data (base station uplink data 301) 201. ing. Among these, the separated additional code 101 for the satellite line is processed in a predetermined manner by the transmission / reception control unit 21, but the public network upstream data 201 is speed-converted to low-speed data by the upstream speed conversion unit 25, and This is transmitted from the device interface 29 to the public network connection device 11.

As can be seen from the above embodiment, the mobile repeater 70 communicates with the existing mobile communication system only by adding the satellite communication control device 20 and the mobile repeater 70 in hardware. It is within the range of the satellite 30 and the mobile terminals 60-1 to 60-1 with respect to the base station 40.
As long as each of the mobile terminals 60-n is accommodated as communicable, even in an area where no public network is provided, the portable terminals 60-1 to 60-n in that area are not provided.
Each is economically accommodated in a public network 10 and is capable of mobile communication.

[0018]

As described above, according to the first aspect, the base station can be installed at an arbitrary position even in an area where the public network is not provided at all, and the area can be set in the area. Each of the mobile terminals within the network is economically accommodated in a public network and can perform mobile communication.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall schematic system configuration in an embodiment of a mobile communication system according to the present invention.

FIG. 2 is a diagram showing a block configuration of an example of a satellite communication control device on the system;

FIG. 3 is a diagram showing a block configuration of an example of a mobile repeater on the system.

FIG. 4 is a diagram showing a line connection state between a public network connection device and a base station according to an example of the present invention;

[Explanation of symbols]

10 public network, 11 public network connection device, 20 satellite communication control device, 30 communication satellite, 40 base station, 60-1
60-n: portable terminal (mobile station), 70: mobile repeater

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI H04M 3/00

Claims (1)

[Claims] 1. A portable terminal which is arbitrarily movable and is once accommodated in a base station via an existing wireless interface, and then accommodated in a public network via a public network connection device. A method of accommodating a public network, wherein a base station that can be installed at an arbitrary position is accommodated in a satellite communication mobile repeater integrated with the base station via an existing digital interface, while a satellite communication The control device is accommodated in a public network connection device via an existing digital interface, and data is bidirectionally transmitted and received between the satellite communication control device and the mobile repeater for satellite communication via a satellite line via a communication satellite. To accommodate each mobile terminal in the public network.