JP3247936B2 - Mobile radio communication system, control station, mobile terminal, control method thereof, and information recording medium - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a mobile radio communication system, a control station, a mobile terminal, a control method thereof, and an information recording medium.

[0002]

2. Description of the Related Art Cellular phones and PDCs (Personal Digital C)
2. Description of the Related Art Mobile radio communication systems that perform mobile communication in an outdoor environment using a microwave frequency band or a quasi-microwave frequency band, such as Pell (Personal Handyphone System) and PHS (Personal Handyphone System), are becoming popular.

On the other hand, in an indoor environment, CATV (CAble
Wired communication systems using optical cables such as TeleVision) are becoming widespread. In addition, wireless communication systems such as cordless telephones using a millimeter-wave frequency band have been proposed, and research and development have been advanced.

[0004]

In such an environment, a user having a mobile terminal can use an analog portable telephone if he / she wants to use the terminal, a PDC terminal if he / she wants to use PDC, and a PHS terminal if he / she wants to use PDC. When the user wants to use the PHS terminal, it is necessary to use the PHS terminal individually, as described above.

A mobile terminal incorporating both a PDC and a PHS and allowing a calling user to select one of them for communication has been proposed. However, this is merely a combination of two communication systems into one. It does not solve the above problem.

[0006] Investigation of the current usage status of users has revealed that mobile terminals are often used in indoor environments such as homes and offices. There is a problem that the terminal cannot be used.

[0007] Furthermore, since the use in a single building tends to concentrate the users, there is a problem that congestion occurs and it becomes difficult to make a communication connection by the mobile terminal.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and enables a communication path of one communication system to pass through various communication paths such as a millimeter wave, a microwave, and an optical cable. In addition, a mobile radio communication system, a control station, a mobile terminal, a control method thereof, and a program for realizing these, which are suitable for maintaining good communication quality by selecting an optimal path, are recorded. It is an object of the present invention to provide an information recording medium which has been described.

[0009]

In order to achieve the above object, the following invention is disclosed in accordance with the principle of the present invention.

[0010] A mobile radio communication system according to a first aspect of the present invention is configured to include a mobile terminal, a control station, a first base station, and a second base station.

Here, the first base station, the mobile terminal,
Communicate in the first frequency band.

On the other hand, the second base station and the mobile terminal
Communication is performed in a second frequency band higher than the first frequency band.

[0013] Further, the control station and the first base station include:
Connected by wire or wireless.

The control station and the second base station are:
Connected by wire or wireless.

On the other hand, the mobile terminal communicates with the control station via either the first base station or the second base station.

In the mobile radio communication system according to the present invention, the mobile terminal communicates with the control station via the second base station when the mobile terminal can communicate with the second base station. It can be configured to communicate with the control station via the base station.

In the mobile radio communication system according to the present invention, the mobile terminal is connected to an adapter that communicates with the second base station in the second frequency band, and communicates with the second base station via the adapter. Where possible, it can be configured to communicate with a control station.

In the communication system according to the present invention, the second base station and the mobile terminal can be connected by wire, and when the mobile terminal is connected by wire to the second base station, the second base station can be connected to the second base station. Communicate with the control station via the station, otherwise the first
It can be configured to communicate with the control station via the base station.

In the communication system according to the present invention, the first base station and the control station can be configured to be connected via an optical cable.

In the communication system according to the present invention, the second base station and the control station can be configured to be connected via an optical cable.

A control station according to a second aspect of the present invention comprises a first base station communicating with a mobile terminal in a first frequency band, a second frequency band higher than the first frequency band with the mobile terminal. And a second base station that communicates with the mobile terminal, and is configured to include a first connection unit, a second connection unit, a selection unit, and a communication unit. .

Here, the first connection unit is connected to the first base station.

On the other hand, the second connection unit is connected to the second base station.

Further, the selection unit selects the second connection unit when there is a connection request from the mobile terminal via the second connection unit, and otherwise selects the second connection unit via the first connection unit. If there is a connection request from the mobile terminal, the first connection unit is selected.

The communication unit communicates with the mobile terminal via the connection unit selected by the selection unit.

A mobile terminal according to a third aspect of the present invention communicates with a control station via a first base station in a first frequency band and switches to a second frequency band higher than the first frequency band. And communicates with the control station via the second base station, and includes a selecting unit, a first converting unit, a second converting unit, and a modem unit.

Here, the selector selects the second base station when communication with the control station is possible via the second base station, and otherwise selects the first base station.

On the other hand, the first conversion unit performs the first conversion by the selection unit.
When the base station is selected, the signal of the first frequency band used for communication with the first base station and the signal of the intermediate frequency band are converted.

Further, when the second base station is selected by the selection unit, the second conversion unit includes a second frequency band signal used for communication with the second base station and an intermediate frequency band signal. And conversion.

The modulation / demodulation unit modulates and demodulates the intermediate frequency band signal converted by the first conversion unit and the second conversion unit.

Here, the modulation and demodulation include not only normal modulation and demodulation but also up-conversion and down-conversion with respect to a baseband (the same applies hereinafter).

Further, in the mobile terminal of the present invention, the second base station and the mobile terminal can be connected by wire,
When the base station and the mobile terminal are connected by wire, the selection unit can be configured to select the second base station.

In the mobile terminal according to the present invention, the second conversion unit is detachable from the mobile terminal, and when the second conversion unit is mounted on the mobile terminal, the selection unit is connected to the second base station. Can be configured to be selected.

[0034] In the mobile terminal of the present invention, the second conversion section may be configured to further include a third conversion section detachable from the mobile terminal.

Here, the third converter converts between a second frequency band used for communication with the second base station and a signal in the first frequency band.

On the other hand, when the third conversion unit is mounted on the mobile terminal, the selection unit selects the second base station.

Further, when the third converter is mounted on the mobile terminal, the third converter is connected to the first converter.

[0038] The control method of the control station according to the fourth aspect of the present invention comprises the following steps: "a first base station that communicates with a mobile terminal in a first frequency band; A control station that communicates with a mobile terminal via a second connection with a second base station that communicates in a second frequency band higher than the first frequency band. "
And a configuration is provided to include a selection step and a communication step.

Here, in the selection step, if a connection request is received from the mobile terminal via the second connection unit, the second connection unit is selected, and if not, the first connection unit is selected. If there is a connection request from the mobile terminal via the mobile terminal, the first connection unit is selected.

On the other hand, in the communication step, communication is performed with the mobile terminal via the connection unit selected in the selection step.

A method for controlling a mobile terminal according to a fifth aspect of the present invention communicates with a control station via a first base station in a first frequency band, and communicates with a control station in a second frequency band higher than the first frequency band. A mobile terminal configured to control a mobile terminal communicating with a control station via a second base station in a frequency band, and to include a selection step, a first conversion step, a second conversion step, and a modulation / demodulation step. I do.

Here, in the selection step, the second base station is selected when communication with the control station is possible via the second base station, and otherwise, the first base station is selected.

On the other hand, in the first conversion step, when the first base station is selected in the selection step, a signal of the first frequency band used for communication with the first base station and a signal of the intermediate frequency band are used. Performs conversion with signals.

Further, in the second conversion step, when the second base station is selected in the selection step, a signal in the second frequency band used for communication with the second base station and a signal in the intermediate frequency band are used. Performs conversion with signals.

In the modulation / demodulation step, modulation and demodulation of the intermediate frequency band signal converted in the first conversion step and the second conversion step are performed.

In the method of controlling a mobile terminal according to the present invention, the second base station and the mobile terminal can be connected by wire, and the second base station and the mobile terminal can be connected by wire. , The selecting step may be configured to select a second base station.

In the above mobile radio communication system, control station, mobile terminal, and control method thereof, the first frequency band is a microwave frequency band or a quasi-microwave frequency band, and the second frequency band is a second frequency band. The band can be configured to be a millimeter wave frequency band.

The program recorded on the information recording medium of the present invention is executed by a computer that controls a control station or a mobile terminal communicably connected to the control station, the mobile terminal, and the computer. Control method, and
The mobile radio communication system according to the present invention can be realized.

Also, an information recording medium on which the program of the present invention is recorded can be distributed and sold independently of the computer.

In particular, when a mobile terminal is a DSP (Digital Signal)
Processor) and FPGA (Field Programmable Gate Ar)
ray), the program recorded on the information recording medium of the present invention is wirelessly transmitted to the mobile terminal, and the DSP or FPG in the mobile terminal is transmitted.
A can do this and use a software radio style approach to the mobile terminal of the present invention.

[0051]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. The embodiments described below are for explanation, and do not limit the scope of the present invention. Therefore, those skilled in the art can adopt embodiments in which each of these elements or all elements are replaced with equivalents, but these embodiments are also included in the scope of the present invention.

(First Embodiment) FIG. 1 is an explanatory diagram showing a schematic configuration of a first embodiment of the mobile radio communication system of the present invention. Hereinafter, description will be made with reference to this figure. In the following description, for example, if the description of the uplink is reversed, the description will be of the downlink, and for ease of understanding, only one of the uplink and the downlink may be referred to. .

In the mobile radio communication system 101, the control station 102, the outdoor radio base station 103, and the indoor radio base station 1
04 and the mobile terminal 105 communicate with each other.

The control station 102 has a plurality of mobile communication networks 107
And an integrated base station 108 for integrating these. The mobile communication network 107 and the integrated base station 108 are connected by wire or wirelessly. In the case of a wired connection, for example, it is also possible to connect with an optical fiber or the like.

The mobile communication network 107 of the control station 102 is connected to an existing outdoor wireless base station 103 such as a portable telephone or PHS. For this connection, a microwave frequency band used in existing mobile communication is used. Outdoor wireless base station 103
When the mobile terminal 105 enters the wireless zone 109 which is controlled by the mobile terminal 105, the mobile terminal 105 can be connected to the mobile communication network 107 and a call can be made.

Hereinafter, in order to facilitate understanding, the "microwave frequency band" includes a frequency band lower than microwaves, such as a quasi-microwave frequency band. Therefore, services such as existing analog mobile phones, PDCs, and PHSs are included.

The microwave frequency band is wide wireless zone 1
The range of the wireless zone 109, which is suitable for providing services to the mobile terminal 09 and controlled by one outdoor wireless base station 103, is as follows in the existing mobile wireless communication system.・ Around a few km radius for analog mobile phones and PDCs.・ PHS has a radius of about 100m to 500m.

The integrated base station 108 includes a plurality of mobile communication networks 1
07 is integrated. On the other hand, the indoor wireless base stations 104 are integrated by integrated distributors 110 arranged in various places. The integrated base station 108 and the integrated distributor 110 are connected by ROF (Radio On Fiber) multi-service transmission using the optical fiber 106. For this connection, a millimeter wave frequency band is used.

The indoor wireless base station 104 and the wireless adapter 1
11 performs wireless communication in the millimeter wave frequency band used for the ROF multi-service transmission. The wireless adapter 111 converts the signal in the millimeter wave frequency band into a microwave frequency band used by the mobile terminal 105 in an outdoor wireless zone or an intermediate frequency band signal used internally by the mobile terminal 105.

The indoor wireless base station 104 is
1 is typically in the range of several tens of meters to one radius.
It is about 00m.

The wired adapter 112 is also connected to the integrated distributor 1.
10 is connected. The wired adapter 112 performs the same function as “the combination of the indoor wireless base station 104 and the wireless adapter 111”. That is, a signal in a millimeter wave frequency band transmitted via an optical cable is converted into a signal in a microwave frequency band or an intermediate frequency band.

When the mobile terminal 105 is attached to the wireless adapter 111 or the wired adapter 112, the communication terminal of the mobile terminal 105 is connected to the wireless adapter 111 or the wired adapter 11.
The two communication terminals come into contact with each other, and communication is performed between the two.

In this embodiment, the integrated distributor 110
Connection between the wireless base station 104 and the
The optical fiber 113 is used for the connection between the cable adapter 10 and the wired adapter 112, but other wired or wireless connections may be used. For example, FTTH (Fiber To The H
ome) or an optical fiber network for a LAN (Local Area Network) can be used.

As described above, the communication between the mobile terminal 105 and the mobile communication network 107 is performed by: (a) when the mobile terminal 105 is attached to the wireless adapter 111,
1, via the indoor wireless base station 104, the optical fiber 113, the integrated distributor 110, the optical fiber 106, and the integrated base station 108, (b) when the mobile terminal 105 is attached to the wired adapter 112, Integrated distributor 11
0, via optical fiber 106, integrated base station 108,
(C) When the mobile terminal 105 is located in the wireless zone 109, any one of these routes is appropriately selected via the outdoor wireless base station 103.

If the propagation time between the mobile communication network 107 and the mobile terminal 105 when using the above route is equal to the propagation time originally allowed for the communication system, the existing equipment, for example, the installed equipment Can be reused. In this case, optical wavelength multiplexing technology, ROF
A mixed transmission technique of a signal and a digital optical signal can be adopted.

FIG. 2 is an explanatory diagram showing the state of connection between the wireless adapter 111 and the mobile terminal 105 according to the first embodiment of the present invention. Hereinafter, description will be made with reference to this figure. In addition,
In this figure, the elements that perform the same functions as the above-mentioned figures include:
The same reference numerals are given. Hereinafter, downlink communication will be described as a typical example. Regarding the uplink, the following description may be considered in reverse, and the description is omitted.

As shown in FIG. 2A, the mobile terminal 105
In the outdoors, usually, a signal (RF) in the microwave frequency band is received via the antenna 201, and this signal is transmitted to the RF-IF.
After the conversion unit 202 converts the signal into an intermediate frequency band signal (IF), the modulation / demodulation unit 203 demodulates the signal.

As shown in FIG. 2B, the wireless adapter 1
11 is connected to the mobile terminal 105 by wire. When the mobile terminal 105 is connected to the wireless adapter 111, the switch 204 in the mobile terminal 105 switches.

The wireless adapter 111 is connected to the indoor wireless base station 1
04 through an antenna 221 to receive a signal (MF) in the millimeter wave frequency band and convert it to an MF-RF converter 2
22 converts the signal into a microwave frequency band signal (RF), and the RF-IF converter 223 further converts the signal into an intermediate frequency band signal (RF).
F).

The signal (IF) in the intermediate frequency band is input to the modem 203 of the mobile terminal 105 via the switch 204, and demodulated.

FIG. 3 is an explanatory diagram showing the state of connection between the wireless adapter 111 and the mobile terminal 105 according to the second embodiment of the present invention. Hereinafter, description will be made with reference to this figure. In addition,
In this figure, the elements that perform the same functions as the above-mentioned figures include:
The same reference numerals are given. Hereinafter, downlink communication will be described as a typical example. Regarding the uplink, the following description may be considered in reverse, and the description is omitted.

As shown in FIG. 3A, the mobile terminal 105
In the outdoors, usually, a signal (RF) in the microwave frequency band is received via the antenna 201, and this signal is transmitted to the RF-IF.
After the conversion unit 202 converts the signal into an intermediate frequency band signal (IF), the modulation / demodulation unit 203 demodulates the signal.

As shown in FIG. 3B, the wireless adapter 1
11 is connected to the mobile terminal 105 by wire, and when connected, the switch 204 is switched.

The wireless adapter 111 is connected to the indoor wireless base station 1
04 through an antenna 221 to receive a signal (MF) in the millimeter wave frequency band and convert it to an MF-RF converter 2
22 converts the signal into a microwave frequency band signal (RF).

The signal (RF) in the microwave frequency band is transmitted to the modem 203 of the mobile terminal 105 through the switch 204.
And demodulated.

If the wired adapter 112 is used, it may be connected directly to the integrated distributor 110 instead of the antenna 221.

As described above, in this embodiment, since the ROF transmission system uses a high frequency of the millimeter wave frequency band and performs communication using a different path from the conventional mobile radio communication system, congestion of the communication network is reduced. Can be eased.

[0078]

As described above, according to the present invention,
Millimeter wave, microwave, optical cable, etc., by allowing various communication paths, by selecting the optimal path, mobile radio communication system suitable for maintaining good communication quality, control station, It is possible to provide a mobile terminal, a control method thereof, and a computer-readable information recording medium recording a program for realizing the method.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a schematic configuration of a first embodiment of a mobile radio communication system according to the present invention.

FIG. 2 is an explanatory diagram showing a state of a connection state of the wireless adapter and the mobile terminal according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a state of connection between a wireless adapter and a mobile terminal according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 Mobile radio communication system 102 Control station 103 Outdoor radio base station 104 Indoor radio base station 105 Mobile terminal 106 Optical fiber 107 Mobile communication network 108 Integrated base station 109 Wireless zone 110 Integrated distributor 111 Wireless adapter 112 Wire adapter 113 Optical fiber 201 Antenna 202 RF-IF converter 203 Modulator / demodulator 204 Switch 221 Antenna 222 MF-RF converter 223 RF-IF converter

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-9-9348 (JP, A) JP-A-10-42360 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04B 7/26 H04Q 7/04-7/38

Claims (15)

(57) [Claims] 1. A mobile terminal, a control station, a first base station,
A mobile radio communication system comprising: a second base station; and the first base station and the mobile terminal communicate with each other in a first frequency band. The mobile terminal communicates with a second frequency band higher than the first frequency band, the control station and the first base station are connected by wire or wireless, and the control station And the second base station are connected by wire or wirelessly, and the mobile terminal and the control station are connected via either the first base station or the second base station. line communication
And the second base station and the mobile terminal can be connected by wire.
In and, (a) said mobile terminal is a wired connection and the second base station
Communication with the control station via the second base station
And (b) if not, via said first base station,
Mobile radio communication system for communicating with a control station
M 2. The mobile terminal is connected to the second base station by wire instead of (a) and (b).
Communication with the control station via the second base station
And, (d) the mobile terminal is a wired connection and the second base station
If the wireless connection is not established,
And (e) the mobile terminal also has a wired connection with the second base station.
If no wireless connection is also made, via the first base station
The mobile radio communication system according to claim 1, wherein the mobile radio communication system communicates with the control station . 3. The mobile terminal is connected to an adapter which communicates with the second base station in the second frequency band, and is connected to the second base station via the adapter by wire or
The mobile radio communication system according to claim 2, wherein the communication with the control station is performed when communication is possible by wireless connection . And wherein said first base station, said control station, the
The connection is made via an optical cable.
4. The mobile radio communication system according to any one of 1 to 3 . And wherein said second base station, said control station, the
Claims, characterized in that it is connected via an optical cable
4. The mobile radio communication system according to any one of 1 to 3 . Wherein said first frequency band is a microwave band or quasi-microwave frequency band, the second frequency band from claim 1, characterized in that the millimeter wave frequency band 5 The mobile radio communication system according to any one of the above. 7. A method for communicating with a control station via a first base station in a first frequency band, and via a second base station in a second frequency band higher than said first frequency band. A mobile terminal that communicates with a control station, wherein if the mobile terminal can communicate with the control station via the second base station, the second base station is selected; otherwise, the first base station is selected. A selecting unit for selecting a station; and when the first base station is selected by the selecting unit,
A first conversion unit that converts a signal in a first frequency band used for communication with the first base station and a signal in an intermediate frequency band; and the second base station is selected by the selection unit. If
A second conversion unit that converts between a signal in a second frequency band used for communication with the second base station and a signal in the intermediate frequency band; the first conversion unit; and the second conversion unit. And a modulation / demodulation unit that performs modulation and demodulation of the intermediate frequency band signal converted by the conversion unit , wherein the second base station and the mobile terminal can be connected by a wire.
And the second base station and the mobile terminal are connected by wire.
In the case, the selecting unit selects the second base station.
Mobile terminal characterized by the above-mentioned. Wherein said second conversion portion is detachable from said mobile terminal, when the second conversion section is attached to the mobile terminal, wherein the selection unit, the second base station The mobile terminal according to claim 7 , wherein the mobile terminal is selected. 9. The method according to claim 1, wherein the first frequency band is transmitted via a first base station.
Communicating with a control station, a second frequency band higher than said first frequency band;
Communicate with the control station via a second base station in the waveband
A mobile terminal capable of communicating with the control station via the second base station
Selects the second base station, otherwise,
A selecting unit for selecting the first base station, and when the first base station is selected by the selecting unit ,
A signal of a first frequency band used for communication with the first base station.
Conversion unit for converting a signal into an intermediate frequency band signal
And when the second base station is selected by the selection unit,
A signal of a second frequency band used for communication with the second base station.
Signal and a signal in the intermediate frequency band.
Converting a section, said first conversion unit, and the second conversion unit, the
To perform modulation and demodulation of the intermediate frequency band signal
And a demodulation unit , wherein the second conversion unit further includes a third conversion unit that is detachable from the mobile terminal. The third conversion unit performs communication with the second base station. The second frequency band to be used and the signal of the first frequency band are converted, and when the third conversion unit is attached to the mobile terminal, the selection unit is configured to be the second base station. select, when the third conversion section is attached to the mobile terminal, the third conversion unit, being connected to the first converter unit
Mobile terminal characterized by the above-mentioned. Wherein said first frequency band is a microwave band or quasi-microwave frequency band, the second frequency band, from the claims 7, characterized in that the millimeter wave frequency band 9 The mobile terminal according to any one of the preceding claims. 11. Communicating with a control station via a first base station in a first frequency band, and communicating with a control station via a second base station in a second frequency band higher than said first frequency band. A method for controlling a mobile terminal that communicates with a control station, wherein, when communication with the control station is possible via the second base station, the second base station is selected; otherwise, the second base station is selected. A selecting step of selecting one base station, and when the first base station is selected in the selecting step,
A first conversion step of converting a signal of a first frequency band used for communication with the first base station and a signal of an intermediate frequency band; and the second base station selects in the selection step If done,
A second conversion step of converting between a signal in a second frequency band used for communication with the second base station and a signal in the intermediate frequency band; the first conversion step; And a modulation / demodulation step of performing modulation and demodulation of a signal in the intermediate frequency band to be converted by the conversion step , wherein the second base station and the mobile terminal can be connected by wire.
And the second base station and the mobile terminal are connected by wire.
In the case, the selecting step may include selecting the second base station.
And a control method for a mobile terminal. Wherein said first frequency band is a microwave band or quasi-microwave frequency band, the second frequency band, according to claim 11, characterized in that the millimeter-wave frequency band Mobile terminal control method. 13. Communicating with a control station via a first base station in a first frequency band, and communicating with a control station via a second base station in a second frequency band higher than said first frequency band. If the computer that communicates with the control station can communicate with the control station via the second base station, select the second base station; otherwise, select the first base station. When the first base station is selected by the selecting unit,
A first conversion unit that performs conversion between a signal in a first frequency band used for communication with the first base station and a signal in an intermediate frequency band, wherein the second base station is selected by the selection unit If
A second conversion unit that converts a signal in a second frequency band used for communication with the second base station and a signal in the intermediate frequency band; and the first conversion unit; a transforming unit, and a modulation of the intermediate frequency band of the signal converted by, to function as a modem unit that performs a demodulation, the second base station, with the computer, a wired contact
The program can be connected to the second base station and the computer by a wired connection.
The selection unit selects the second base station
Computer readable characterized by functioning as
Information recording medium. 14. The method of claim 13, wherein the first frequency band is a microwave band or quasi-microwave frequency band, the second frequency band, according to claim 13, characterized in that the millimeter-wave frequency band Information recording medium. 15. the information recording medium, a compact disk, floppy disk, hard disk, magneto-optical disk, a digital video disk, magnetic tape, or claim 13 or characterized in that it is a semiconductor memory
Or the information recording medium according to 14 .