JP3243507B2 - Integrated base station, receiving method, and information recording medium - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a communication system, an integrated base station, a local base station, a mobile terminal, a transmission method, a relay method, a reception method, and an information recording medium.

[0002]

2. Description of the Related Art Conventionally, there have been provided techniques for providing various communication broadcasting services to a mobile object such as a person or an automobile moving outdoors. Such communication broadcasting services include mobile phones, PHS (Personal Handyphone Sy
stem), pager (pager) and other call services, contact services, TV (TeleVision) broadcasting, FM
(Frequency Modulation) Broadcasting services that provide broadcasting and digital broadcasting, ITS (Intelligent Transport System) that provides road traffic information to moving vehicles, VICS (Vehicle Inform)
ation and Communication System).

[0003] Each of these services is assigned a dedicated frequency band, and communicates with a terminal (mobile terminal) of a mobile using radio waves of that frequency. For example,
The following frequency bands are used.・ 800MHz band and 1.5GHz band for mobile phones ・ 2.5GHz band for VICS ・ 76MHz to 90MHz band for FM broadcasting ・ 90MHz to 770MHz band for TV broadcasting ・ 12GHz band for digital broadcasting

Conventionally, in order to provide such services to mobile terminals, local base stations are arranged in places where mobiles such as humans and automobiles are easy to pass and where they are easy to stay, for example, along roads. Communication with a mobile terminal through a transmitting / receiving antenna.

[0005] In particular, in ITS and VICS, a number of local base stations are arranged along the road because it is necessary to continuously provide services to moving vehicles. Also, PH
Also in the S system, since the limit of the number of mobile terminals that can be processed by one local base station is small, a large number of local base stations are arranged.

On the other hand, on the mobile side, it is necessary to prepare various types of mobile terminals according to the type of service provided.

[0007]

However, there is a problem that it is complicated to prepare mobile terminals for the number of service types desired to be provided on the mobile side.
For example, in order to receive each service of a mobile phone, FM broadcast / TV broadcast, and VICS by car, it is necessary to prepare three to four or more antennas. Since it is necessary to prepare mobile terminals separately, the cost increases, a place for arranging a large number of antennas is required, and problems such as impairing the aesthetics of a car have arisen.

[0008] The present invention has been made to solve the above-mentioned problems, and has been made in consideration of a communication system, an integrated base station, a local base station, a mobile terminal, a transmission method, a relay method, a reception method, and an information recording medium. The purpose is to provide.

In particular, a communication system suitable for a communication system in which a mobile terminal can receive services in different frequency bands with one kind of antenna, an integrated base station, a local base station, a mobile terminal, a transmission method, a relay method, and a reception method It is an object to provide a method and an information recording medium.

[0010]

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

[0011] A communication system according to the present invention comprises: an integrated base station;
It is configured to include an optical fiber, a local base station, and a mobile terminal.

[0012] The integrated base station converts signals of a plurality of types of communication broadcasting services so as to be included in a predetermined frequency band,
The converted signal is transmitted to a local base station via an optical fiber.

[0013] The local base station receives a signal transmitted by the integrated base station via an optical fiber, and transmits the received signal to the mobile terminal via a transmission antenna.

[0014] The mobile terminal receives a signal transmitted from the local base station via a transmission antenna via a reception antenna, and distributes the received signal to a plurality of types of communication broadcast service signals.

An integrated base station according to the present invention is connected to a local base station via an optical fiber, and is configured to include a conversion unit and a transmission unit. The conversion unit converts signals of a plurality of types of communication broadcasting services so as to be included in a predetermined frequency band. The transmitting unit transmits the converted signal to the local base station via an optical fiber.

[0016] The plurality of local base stations of the present invention are connected to an integrated base station that converts signals of a plurality of types of communication broadcasting services so as to be included in a predetermined frequency band and transmits the converted signals via an optical fiber. Each of them is configured to include a receiving unit and a transmitting antenna. The receiving unit receives the signal transmitted by the integrated base station via the optical fiber, and the transmitting antenna transmits the received signal with a circular polarization different from that of the adjacent local base station among the local base stations. .

A mobile terminal according to the present invention converts a signal of a plurality of types of communication broadcasting services into a signal included in a predetermined frequency band by using a circularly polarized transmission antenna different from that of an adjacent local base station. The base station is wirelessly connected to a plurality of local base stations transmitting data via the first base station, and is configured to include a first receiving antenna, a second receiving antenna, a selecting unit, and a distributing unit.

The first circularly polarized first receiving antenna and the second circularly polarized second receiving antenna receive signals in a predetermined frequency band transmitted by a plurality of local base stations. I do. The selector selects one of the signals received by the first receiving antenna and the second receiving antenna. The distribution unit distributes the selected signal to a plurality of types of communication broadcast service signals.

A mobile terminal according to the present invention converts a signal of a plurality of types of communication broadcasting services into a signal included in a predetermined frequency band by using a circularly polarized transmission antenna different from that of an adjacent local base station. The base station is wirelessly connected to a plurality of local base stations transmitting data via the first base station, and is configured to include a first receiving antenna, a second receiving antenna, a coupling unit, and a distribution unit.

The first circularly polarized first receiving antenna and the second circularly polarized second receiving antenna receive signals in a predetermined frequency band transmitted by a plurality of local base stations. I do. The coupling unit includes: a signal received by the first reception antenna;
The signal received by the second receiving antenna is combined. The distribution unit distributes the combined signal to a plurality of types of communication broadcast service signals.

The mobile terminal of the present invention is wirelessly connected to a local base station which converts a signal of a plurality of types of communication broadcasting services and transmits the signal included in a predetermined frequency band via a transmission antenna. , A receiving antenna, and a distribution unit.

The receiving antenna receives a signal of a predetermined frequency band transmitted from the local base station. The distribution unit distributes the received signal to signals of a plurality of types of communication broadcasting services.

A mobile terminal according to the present invention is provided with a plurality of local base stations for converting signals of a plurality of types of communication broadcasting services and transmitting the signals included in a predetermined frequency band via a transmitting antenna, and a plurality of local base stations. And a receiving antenna, a compensating unit, and a distributing unit.

The receiving antenna receives a signal in a predetermined frequency band transmitted by a plurality of local base stations. The compensator compensates for the time delay difference of the received signal. The distribution unit distributes the compensated signal to signals of a plurality of types of communication broadcasting services.

[0025] The mobile terminal of the present invention is wirelessly connected to a plurality of local base stations for transmitting signals of a plurality of types of communication broadcast services and transmitting signals included in a predetermined frequency band. It is configured to include a receiving antenna, a selection unit, and a distribution unit.

The plurality of receiving antennas receive signals in a predetermined frequency band transmitted by the plurality of local base stations. The selector selects one of the signals received by the plurality of receiving antennas. The distribution unit distributes the selected signal to a plurality of types of communication broadcast service signals.

[0027] The mobile terminal of the present invention is wirelessly connected to a plurality of local base stations for transmitting signals of a plurality of types of communication broadcasting services so as to be included in a predetermined frequency band. It is configured to include a receiving antenna, a coupling unit, and a distribution unit.

The plurality of receiving antennas receive signals in a predetermined frequency band transmitted by the plurality of local base stations. The combining unit combines the signals received by the plurality of receiving antennas. The distribution unit distributes the combined signal to a plurality of types of communication broadcast service signals.

[0029] The communication system of the present invention is configured to include a mobile terminal, a local base station, an optical fiber, and an integrated base station.

The mobile terminal converts signals of a plurality of types of communication broadcasting services so as to be included in a predetermined frequency band, and transmits the converted signals to a local base station via a transmission antenna.

The local base station receives the signal transmitted by the mobile terminal via the transmitting antenna via the receiving antenna, and transmits the received signal to the integrated base station via the optical fiber.

The integrated base station receives the signal transmitted by the local base station via the optical fiber, and distributes the received signal to a plurality of types of communication broadcast service signals.

[0033] The mobile terminal of the present invention is wirelessly connected to a local base station, and is configured to include a conversion unit and a transmission antenna.

The conversion unit converts signals of a plurality of types of communication broadcasting services so that the signals are included in a predetermined frequency band. The transmitting antenna transmits the converted signal to the local base station.

[0035] The mobile terminal of the present invention is wirelessly connected to a local base station and is configured to include a conversion unit, a first transmitting antenna, and a second transmitting antenna.

The conversion unit converts signals of a plurality of types of communication broadcasting services so as to be included in a predetermined frequency band. The first transmitting antenna transmits the converted signal to the local base station. The second transmitting antenna transmits the converted signal to the local base station.

Further, the first transmitting antenna and the second transmitting antenna of the mobile terminal of the present invention are configured to transmit signals converted with mutually different circularly polarized waves to the local base station. Can be.

The local base station according to the present invention converts signals of a plurality of types of communication broadcasting services and transmits the signals included in a predetermined frequency band through a plurality of transmission antennas of different circular polarizations. Wireless connection with the mobile terminal
It is connected to the integrated base station via an optical fiber, and is configured to include a predetermined circularly polarized reception antenna and a transmission unit.

The predetermined circularly polarized receiving antenna receives a signal transmitted by the mobile terminal via any of the plurality of transmitting antennas. The transmitting unit transmits the received signal to the integrated base station via an optical fiber.

The integrated base station of the present invention is connected, via an optical fiber, to a local base station that converts signals of a plurality of types of communication and broadcast services and transmits the signals to be included in a predetermined frequency band. , A receiving unit, and a distributing unit.

The receiving unit receives a signal transmitted from the local base station via an optical fiber. The distribution unit distributes the received signal to signals of a plurality of types of communication broadcasting services.

The integrated base station of the present invention converts, via an optical fiber, a plurality of local base stations for converting signals of a plurality of types of communication broadcasting services and transmitting signals included in a predetermined frequency band. And a plurality of receiving units, a plurality of distributing units, and a plurality of coupling units.

The plurality of receiving units receive signals transmitted from the local base station via the optical fiber. The plurality of distributing units respectively distribute the received signals to a plurality of types of communication broadcast service signals. The plurality of combining units combine the distributed signals of the plurality of types of communication broadcasting services for each type.

Further, the integrated base station of the present invention can be configured to further include a plurality of compensating units.

The plurality of compensating units compensate for the time delay difference between the signals of the plurality of types of communication broadcasting services combined.

The integrated base station of the present invention converts, via an optical fiber, a plurality of local base stations that convert signals of a plurality of types of communication broadcasting services and transmit signals included in a predetermined frequency band. And a plurality of receiving units, a coupling unit, and a distribution unit.

The plurality of receiving units respectively receive signals transmitted by the plurality of local base stations via the optical fibers. The combining unit combines the received signals. The distribution unit distributes the combined signal to a plurality of types of communication broadcast service signals.

Further, the integrated base station of the present invention can be configured to further include a plurality of compensating units.

The plurality of compensating units compensate for the time delay differences of the signals of the plurality of types of distributed communication broadcasting services.

The transmission method of the present invention is used in an integrated base station connected to a local base station via an optical fiber, and is configured to include a conversion step and a transmission step.

In the conversion step, signals of a plurality of types of communication broadcasting services are converted so as to be included in a predetermined frequency band. In the transmitting step, the converted signal is transmitted to the local base station via the optical fiber.

The relay method according to the present invention converts a plurality of types of communication / broadcasting service signals so as to be included in a predetermined frequency band, and connects the plurality of communication / broadcasting service signals to an integrated base station which transmits the signals via an optical fiber. Used in each of the local base stations, it is configured to include a receiving step and a transmitting step.

In the receiving step, the signal transmitted from the integrated base station via the optical fiber is received. In the transmitting step, the received signal is transmitted with a circularly polarized wave different from that of an adjacent local base station among the local base stations.

According to the receiving method of the present invention, a signal of a plurality of types of communication broadcasting services is converted to be included in a predetermined frequency band, and a signal having a circularly polarized transmission antenna different from that of an adjacent local base station is provided. It is used in a mobile terminal that is wirelessly connected to a plurality of local base stations that transmit data via the base station, and is configured to include a receiving step, a selecting step, and a distribution step.

In the receiving step, a signal in a predetermined frequency band transmitted by the plurality of local base stations is converted into a first reception antenna having a predetermined circular polarization and a second reception antenna having a different circular polarization from the first reception antenna. Receive through.

In the selecting step, one of the signals received by the first receiving antenna and the second receiving antenna is selected.

In the distribution step, the selected signal is distributed to a plurality of types of communication broadcast service signals.

According to the receiving method of the present invention, a signal of a plurality of types of communication and broadcasting services is converted to be included in a predetermined frequency band by transmitting a circularly polarized transmitting antenna different from that of an adjacent local base station. It is used in a mobile terminal that is wirelessly connected to a plurality of local base stations that transmit data via the base station, and is configured to include a receiving step, a combining step, and a distribution step.

In the receiving step, a signal in a predetermined frequency band transmitted by the plurality of local base stations is converted into a first reception antenna having a predetermined circular polarization and a second reception antenna having a different circular polarization from the first reception antenna. Receive through.

In the combining step, the signal received via the first receiving antenna and the signal received via the second receiving antenna are combined.

In the distribution step, the combined signal is distributed to a plurality of types of communication broadcast service signals.

[0062] The receiving method of the present invention is wirelessly connected to a local base station that converts a signal of a plurality of types of communication broadcasting services and transmits the signal included in a predetermined frequency band via a transmitting antenna. The mobile terminal is configured to include a receiving step and a distributing step.

In the receiving step, a signal of a predetermined frequency band transmitted by the local base station is received via a receiving antenna. In the distribution step, the received signal is distributed to a plurality of types of communication broadcast service signals.

A receiving method according to the present invention comprises: a plurality of local base stations for converting signals of a plurality of types of communication / broadcasting services so as to be included in a predetermined frequency band via a transmitting antenna; It is used in a connected mobile terminal and is configured to include a receiving step, a compensating step, and a distribution step.

In the receiving step, signals of a predetermined frequency band transmitted by a plurality of local base stations are received via a receiving antenna. In the compensating step, the time delay difference of the received signal is compensated. In the distribution step, the compensated signal is distributed to a plurality of types of communication broadcast service signals.

A receiving method according to the present invention is a mobile terminal wirelessly connected to a plurality of local base stations for transmitting signals of a plurality of types of communication broadcasting services and transmitting signals included in a predetermined frequency band. And is configured to include a receiving step, a selecting step, and a distributing step.

In the receiving step, signals of a predetermined frequency band transmitted by a plurality of local base stations are received via a plurality of receiving antennas. In the selection step, one of the signals received via the plurality of receiving antennas is selected. In the distribution process,
The selected signal is distributed to a plurality of types of communication broadcast service signals.

A receiving method according to the present invention provides a mobile terminal wirelessly connected to a plurality of local base stations for transmitting signals of a plurality of types of communication broadcasting services and transmitting signals included in a predetermined frequency band. And is configured to include a receiving step, a combining step, and a distribution step.

In the receiving step, signals of a predetermined frequency band transmitted by a plurality of local base stations are received via a plurality of receiving antennas. In the combining step, the signals received via the plurality of receiving antennas are combined. In the distribution step, the combined signal is distributed to a plurality of types of communication broadcast service signals.

The transmitting method of the present invention is used in a mobile terminal wirelessly connected to a local base station, and is configured to include a converting step and a transmitting step.

In the conversion step, signals of a plurality of types of communication broadcasting services are converted so as to be included in a predetermined frequency band. In the transmitting step, the converted signal is transmitted to the local base station via the transmitting antenna.

The transmission method of the present invention is used in a mobile terminal wirelessly connected to a local base station, and is configured to include a conversion step, a first reception step, and a second reception step. You.

In the conversion step, signals of a plurality of types of communication broadcasting services are converted so as to be included in a predetermined frequency band. In the first transmitting step, the converted signal is transmitted to the local base station via the first transmitting antenna. In the second transmitting step, the converted signal is transmitted to the local base station via the second transmitting antenna.

In the first transmission step and the second transmission step of the transmission method of the present invention, the first transmission antenna and the second transmission antenna are different circularly polarized transmission antennas. It can be configured as follows.

According to the relay method of the present invention, signals of a plurality of types of communication broadcasting services are converted and included in a predetermined frequency band and transmitted through a plurality of transmission antennas having different circularly polarized waves. Used at a local base station, which is wirelessly connected to a mobile terminal and connected to an integrated base station via an optical fiber, and is configured to include a receiving step and a transmitting step.

In the receiving step, a signal transmitted by the mobile terminal via any of a plurality of transmitting antennas is received via a predetermined circularly polarized receiving antenna. In the transmitting step, the received signal is transmitted to the integrated base station via the optical fiber.

The receiving method according to the present invention is connected via a fiber optic to a local base station for transmitting a signal of a plurality of types of communication broadcasting services and transmitting the signal included in a predetermined frequency band. Used in the integrated base station, receiving process,
And a distributing step.

In the receiving step, a signal transmitted from the local base station via the optical fiber is received. In the distribution step, the received signal is distributed to a plurality of types of communication broadcast service signals.

The receiving method according to the present invention is connected to a plurality of local base stations for transmitting signals of a plurality of types of communication and broadcasting services so as to be included in a predetermined frequency band via an optical fiber. And is configured to include a receiving step, a distributing step, and a combining step.

In the receiving step, the signals transmitted by the plurality of local base stations via the optical fibers are respectively received. In the distribution step, the received signals are distributed to signals of a plurality of types of communication broadcasting services. In the combining step, the distributed signals of the plurality of types of communication broadcasting services are combined for each type.

Further, the receiving method of the present invention can be configured to further include a compensation step.

In the compensating step, the time delay difference of the signals of the plurality of types of communication broadcasting services combined is compensated for respectively.

The receiving method according to the present invention is connected to a plurality of local base stations via optical fibers for transmitting signals of a plurality of types of communication broadcasting services and transmitting signals included in a predetermined frequency band. And is configured to include a receiving step, a combining step, and a distribution step.

In the receiving step, the signals transmitted by the plurality of local base stations via the optical fibers are received. In the combining step, the received signals are combined. In the distribution step, the combined signal is distributed to a plurality of types of communication broadcast service signals.

Further, the receiving method of the present invention can be configured to further include a compensation step.

In the compensating step, the time delay difference between the signals of the distributed plural types of communication broadcasting services is compensated.

A program for realizing the communication system, integrated base station, local base station, mobile terminal, transmission method, relay method, and reception method of the present invention is stored in a compact disk, floppy disk, hard disk, magneto-optical disk, digital video It can be recorded on an information recording medium such as a disk, a magnetic tape, and a semiconductor memory.

By executing the program recorded on the information recording medium of the present invention in the integrated base station, the local base station, and the mobile terminal, the above communication system, integrated base station, local base station, mobile base station, A terminal, a transmission method, a relay method, and a reception method can be realized.

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

[0090]

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 shows a schematic configuration of a first embodiment of the communication system of the present invention. FIG. 1 is a schematic diagram illustrating a schematic configuration of a first embodiment of a communication system according to the present invention.

The communication system 101 includes an integrated base station 102
, An optical fiber 103, a local base station 104, and a mobile terminal 105.

The integrated base station 102 is connected to a local base station 104 via an optical fiber 103. Between the two,
Communication is performed by optical signals. Generally, one integrated base station 102 is connected to multiple local base stations 104, which are located in relatively close proximity, for example, along the same road.

[0094] The local base station 104 and the mobile terminal 105 are wirelessly connected, and communication is performed by radio signals.

Hereinafter, the mobile terminal 105 is transmitted from the integrated base station 102 via the optical fiber 103 and the local base station 104 as appropriate.
A situation in which a signal for a communication broadcast service is transmitted is referred to as “down”, and the reverse situation is referred to as “up”.

Although the number of types of communication broadcasting service is four for convenience of explanation, the same embodiment can be adopted for an arbitrary number, and this embodiment is also included in the scope of the present invention.

For the sake of explanation, one integrated base station 1
Although the number of local base stations 104 connected to the optical network 02 via the optical fiber 103 is three, the same embodiment can be adopted for an arbitrary number, and the embodiment is also included in the scope of the present invention. .

(Embodiment of Downlink Signal Transmission) First, details of an embodiment for downlink signal transmission will be described with reference to FIGS. FIG. 2 is a block diagram showing a schematic configuration of the integrated base station 102 for downlink signal transmission, the optical fiber 103, and the plurality of local base stations 104 according to the first embodiment shown in FIG. .

FIG. 3 is a block diagram showing a schematic configuration of each of the local base stations 104 according to the first embodiment shown in FIG.

FIG. 4 is a block diagram showing a schematic configuration of the mobile terminal 105 of the first embodiment shown in FIG. 2 to 4, the same reference numerals are given to the same elements as those in FIG.

(First Embodiment of Integrated Base Station for Downlink Signal Transmission) As shown in FIG. 2, the integrated base station 102 has four terminals 201 for four types of communication broadcast services A, B, C, and D.
Down signal is received. TV as a communication broadcasting service
In the case where broadcast, FM broadcast, mobile phone, and ITS are employed, the four terminals 201 receive downlink radio signals of these communication broadcast services.

The frequency converter 202 has four terminals 201
Output a radio signal (electric signal) obtained by converting the received radio signal into a predetermined frequency band.

By converting signals of various communication broadcasting services to fall within a predetermined frequency band, a plurality of types of communication broadcasting services can be provided by one antenna, as described later.

The radio signal-to-optical signal converter 203 converts the radio signal (electric signal) output from the frequency converter 202 into an optical signal.

The optical coupling section 204 couples the optical signal output from the radio signal → optical signal conversion section 203.

The optical splitter 205 splits the optical signal output from the optical coupler 204.

In the following, for convenience of explanation, three local base stations 104 are connected to the integrated base station 102.
It is easy to change this number, and the changed embodiment is also included in the scope of the present invention.

The optical signal split by the optical splitter 205 is transmitted to the local base station 104 via the optical fiber 103.

(Embodiment of Local Base Station for Downlink Signal Transmission)
As shown in FIG. 3, the receiving units 301 of the local base station 104 each receive an optical signal. Optical signal to wireless signal converter 3
02 converts each optical signal into a radio signal (electric signal), and the converted radio signal is transmitted to the mobile terminal as a radio wave by the transmission antenna 303.

(Embodiment of mobile terminal for downlink signal transmission) As shown in FIG.
4 receives the radio signal transmitted by the receiving antenna 401.

The radio signal (electric signal) received by the receiving antenna 401 is distributed to the frequency band of each communication broadcast service by the radio signal distribution unit 402.

[0112] Communication broadcast terminal section 403 receives the signals distributed by radio signal distribution section 402, respectively. The communication broadcast terminal unit 403 includes, for example, a mobile phone terminal, a VICS
Terminal, FM radio receiver and TV receiver are included. Further, an integrated service terminal in which the communication broadcast terminal unit 403 is integrally configured may be employed.

(Signal Frequency Band) FIG. 5 shows the relationship between the frequency band of the signal of each communication broadcasting service and the frequency band of the signal transmitted by wireless communication between the local base station 104 and the mobile terminal 105. FIG.

As a predetermined frequency band, for example, 36.0
When the frequency band from GHz to 38.2 GHz is adopted, the signal of each communication broadcasting service can be converted into a signal in the following range.・ FM broadcasting: 76MHz to 90MHz band → 36.
0GHz to 36.1GHz ・ TV broadcasting is 90MHz to 770MHz band → 3
6.5GHz ~ 37.5GHz ・ For mobile phones, 1.5GHz band → 37.7GHz ~ 3
8.0GHz ・ VICS is 2.5GHz band → 38.1GHz ~ 3
8.2GHz

Note that the range of the frequency band after the conversion can be changed as appropriate, and the changed embodiment is also included in the scope of the present invention.

The optical signals output from the radio signal → optical signal converter 203 are 36.0 GHz to 36.1 GHz, respectively.
(For FM broadcasting), 36.5 GHz to 37.5 GHz (TV
37.7 GHz to 38.0 GHz (for mobile phones), 38.1 GHz to 38.2 GHz (for VICS),
Only the signal of

On the other hand, the optical signal output from the optical coupling unit 204 and transmitted to the local base station 104 via the optical fiber 103 and the transmission antenna 303 of the local base station 104 transmit
The radio signal received by the receiving antenna 401 of the mobile terminal 105 includes these four signals in a predetermined frequency band of 36.0 GHz to 38.2 GHz.

Radio signal distribution section 402 of mobile terminal 105
Receives a radio signal (electric signal) in a predetermined frequency band of 36.0 GHz to 38.2 GHz, and
GHz to 36.1 GHz (for FM broadcasting), 36.5 GHz
37.5 GHz (for TV broadcasting) 37.7 GHz to 38.
0 GHz (for mobile phones), 38.1 GHz to 38.2 GH
z (for VICS).

In the case where the frequency conversion is performed as described above, for example, frequency multiplexing conversion can be performed so as to fall within a predetermined frequency band. Also, spread spectrum multiplexing conversion can be performed. Also, these can be used in combination.

As in the present embodiment, the "predetermined frequency band"
Can be configured so as not to overlap with the frequency band of the signal of each communication broadcast service. Needless to say, an embodiment in which these parts partially overlap may be adopted.

(Arrangement of Amplifier) In the above embodiment, an amplifier can be appropriately arranged in the middle of signal transmission. The amplifier can compensate for loss due to signal branching and distribution and loss due to long-distance transmission of the optical fiber 103.

For example, the optical branching unit 2 of the integrated base station 102
An optical amplifier is provided at the subsequent stage of the optical fiber 103 to output the amplified optical signal to the optical fiber 103. Further, an optical amplifier may be provided between the optical coupling unit 204 and the optical branching unit 205.

The receiving antenna 40 of the mobile terminal 105
1 and the radio signal distribution unit 402 or the radio signal distribution unit 4
A radio signal amplifier can be appropriately provided between the communication broadcast terminal unit 02 and the communication broadcast terminal unit 403.

In the above description, the communication broadcasting service is provided by a radio signal, but an embodiment provided by an optical signal from the beginning may be adopted. In this case, the wireless signal-to-optical signal converter 203 becomes unnecessary, and the frequency converter 202 converts the optical signal.

In this case, the frequency conversion section 202 can directly perform frequency conversion of an optical signal. In addition, the optical signal is once converted into a radio signal (electric signal), the frequency of the radio signal is converted, and then converted back to the optical signal, whereby an inexpensive frequency converter 2 using existing elements and circuits is used.
02 can also be realized.

(Second Embodiment of Integrated Base Station for Downlink Signal Transmission) FIG. 6 is a block diagram showing an outline of a second embodiment of the integrated base station 102. Note that, in FIG. 6, the same elements as those in FIG. 2 are denoted by the same reference numerals.

In this embodiment, a terminal 201 receives a radio signal of each communication broadcast service. The frequency conversion unit 202 converts the frequency of the radio signal received by the terminal 201. The wireless signal coupling unit 601 converts a wireless signal in a frequency band corresponding to each communication broadcast service into a wireless signal in a predetermined frequency band. The converted radio signal is
The signal is converted into an optical signal by the wireless signal → optical signal converter 602 and output to the plurality of optical fibers 103 by the optical branching unit 205.

In this embodiment, since one wireless signal → optical signal converter 602 converts the wireless signal into an optical signal at a time, an optical coupler is not required, and the system configuration can be simplified. Which embodiment is adopted depends on
Issues such as cost can be determined by comparison.

(First Embodiment of Radio Signal-to-Optical Signal Converter) FIG. 7 shows a radio signal of the integrated base station 102 shown in FIG.
FIG. 7 is a configuration diagram illustrating a first embodiment of a wireless signal → optical signal converter, such as an optical signal converter 203 and a wireless signal → optical signal converter 602 of the integrated base station 102 shown in FIG. 6.

When the radio signal 702 is input, the radio signal-to-optical signal conversion unit 701 superimposes the radio signal 702 on the current from the power source 703 to increase the injection current to the semiconductor laser 705. Let it be converted. As a result, the semiconductor laser 705 transmits the radio signal 70
2 is output as an optical signal 706.

As the semiconductor laser 705, a distributed feedback semiconductor laser capable of high-speed modulation or the like can be used.

(Second Embodiment of Radio Signal-to-Optical Signal Converter) FIG. 8 shows a radio signal of the integrated base station 102 shown in FIG.
FIG. 7 is a configuration diagram illustrating a second embodiment of a wireless signal → optical signal converter, such as an optical signal converter 203 and a wireless signal → optical signal converter 602 of the integrated base station 102 shown in FIG. 6.

The radio signal → optical signal conversion section 801 inputs the input radio signal 802 to an external modulator 803.
On the other hand, the optical signal 806 continuously output by the current from the power supply 804 and output from the semiconductor laser 805 is also output from the external converter 803.
Has been entered.

The external converter 803 includes a semiconductor laser 805
Is modulated by the wireless signal 802, and the result of the modulation is output as the optical signal 807. As the external converter, a semiconductor EA (Electric Absorb) converter, a converter using a dielectric waveguide, or the like can be used.

(Second Embodiment of Mobile Terminal for Downlink Signal Transmission) FIG. 9 shows the mobile terminal 105 of the communication system shown in FIG.
FIG. 7 is a block diagram showing a schematic configuration of the second embodiment. Note that, in FIG. 9, elements that perform the same functions as in FIG. 4 are denoted by the same reference numerals.

[0136] As shown in FIG.
The wireless signal transmitted by the local base station 104 is transmitted to the receiving antenna 4
01 receives.

The delay compensation section 901 compensates for the delay of the radio signal (electric signal) received by the receiving antenna 401. This is for compensating for a time delay difference generated until radio waves emitted from a plurality of local base stations 104 arranged along the road reach the receiving antenna 401.

[0138] The signal whose time delay difference has been compensated is distributed by the radio signal distribution section 402 to the frequency band of each communication broadcast service.

[0139] Communication broadcast terminal section 403 receives the signals distributed by radio signal distribution section 402, respectively.

It is also possible to adopt an embodiment in which the signal received by the receiving antenna is first distributed by the radio signal distribution section 402, and delay compensation is performed for each communication broadcast service.

In each embodiment, an amplifier can be provided before and after the delay compensator.

(Third Embodiment of Mobile Terminal for Downlink Signal Transmission) FIG. 10 shows a mobile terminal 10 of the communication system shown in FIG.
FIG. 13 is a block diagram showing a schematic configuration of a third embodiment of FIG. Note that, in FIG. 10, the elements that perform the same functions as those in FIGS. 4 and 9 are denoted by the same reference numerals.

As shown in FIG. 10, in mobile terminal 105, two reception antennas 1001 receive a radio signal transmitted by local base station 104.

The radio signals received by the two receiving antennas 1001 are superimposed and output by the summing and coupling section 1002 so that the signal strength increases.

For example, a plurality of local base stations 1 along a road
By the time radio waves emitted from the radio terminal 04 reach the mobile terminal 105, these radio waves may interfere with each other and cause fading. The two receiving antennas 1001 are installed at spatially different positions, and the addition and coupling unit 1002 compensates for a decrease in received power of radio waves due to fading.

The compensated signal is supplied to a radio signal distribution unit 402
Is distributed to the frequency band of each communication broadcasting service.

[0147] Communication broadcast terminal section 403 receives the signals distributed by radio signal distribution section 402, respectively.

Further, an embodiment may be adopted in which a selector for selecting and outputting the signal having the larger signal strength is provided in place of the addition and coupling unit 1002.

Further, in the communication system shown in FIG.
The circular polarization of the radio wave emitted from the local base station 104 can be a circular polarization that is different between adjacent local base stations 104. For example, when the local base station 104 is viewed along the road, each local base station 104 is sequentially turned to the right-handed circular polarization, the left-handed circular polarization, the right-handed circular polarization, the left-handed circular polarization, and so on. Of the transmission antenna 303 is set.

At the same time, with respect to the two receiving antennas 1001 of the mobile terminal 105, one is set to right-handed circular polarization and the other is set to left-handed circular polarization. In this case, the signals received by the two receiving antennas 1001 can be superimposed by the addition coupling unit 1002 so that the intensity is increased, or either of the two signals can be selected by the selection unit.

In this embodiment, the adjacent local base station 1
Even in a part where the radio waves transmitted by the radio wave 04 overlap, the fading is less likely to occur due to the different circular polarization.

In any of the embodiments, an amplifier can be provided before and after the addition coupling section 1002 and the selection section.

(Embodiment of Uplink Signal Transmission) Hereinafter, an embodiment of uplink signal transmission of the communication system shown in FIG. 1 will be described with reference to FIGS.

FIG. 11 is a block diagram showing an outline of an embodiment of uplink signal transmission of the mobile terminal 105.

FIG. 12 is a block diagram showing an outline of an embodiment of uplink signal transmission of the local base station 104.

FIG. 13 is a block diagram showing an outline of an embodiment of uplink signal transmission of the integrated base station 102.

(Embodiment of Mobile Terminal for Uplink Signal Transmission) As shown in FIG. 11, the mobile terminal 105 is provided with a communication broadcast terminal unit 403 common to downlink signal transmission corresponding to a plurality of communication broadcast services. I have.

Radio signals (electric signals) output by these
Are converted by the frequency conversion unit 1101 so as to be included in a predetermined frequency band. As for the conversion, the conversion of the frequency band shown in FIG. 5 can be performed as described above.

The frequency-converted radio signal is added and coupled by radio signal coupling section 1102,
3 transmitted. This transmitting antenna 1103 can be shared with the receiving antenna.

In the embodiment in which two receiving antennas are prepared, these can be shared as transmitting antennas. These transmission antennas can output the same signal. Although the difference between the positions of the two transmitting antennas (for example, 1 m to 3 m) in the mobile terminal is smaller than the distance between the plurality of local base stations (for example, about 50 m),
The interval is sufficient to cope with fading caused by a building or the like.

[0161] Further, the transmitting antenna may adopt an embodiment in which one is a right-handed circularly polarized wave and the other is a left-handed circularly polarized wave, and emits radio waves.

Note that an embodiment in which an amplifier is provided before and after the frequency conversion unit 1101 and before and after the radio signal coupling unit 1102 can be adopted.

(Embodiment of Local Base Station for Uplink Signal Transmission)
As shown in FIG. 12, the local base station 104
The radio signal transmitted by the radio receiver 05 is received by the receiving antenna 1201. This receiving antenna 1201 can be shared with the transmitting antenna 303.

The received radio signal is converted into an optical signal by a radio signal → optical signal converter 1202,
3 to the optical fiber 103.

As the radio signal → optical signal converter 1202, the same embodiment as the radio signal → optical signal converter 701 or the radio signal → optical signal converter 801 described with reference to FIGS. 7 and 8 is employed. be able to.

Also, the reception antenna 1201 and the radio signal →
An embodiment in which an amplifier is provided between the optical signal conversion unit 1202 and an embodiment in which an optical amplifier is provided in the transmission unit 1203 can be adopted.

(Embodiment of Integrated Base Station for Uplink Signal Transmission)
As shown in FIG. 13, the integrated base station 102 converts the optical signals transmitted from the three local base stations 104 via the optical fiber 103 into a plurality of optical signal → wireless signal conversion units 1 respectively.
The signal is converted into a wireless signal (electric signal) by 301.

The wireless signals (electric signals) converted and output by the optical signal → wireless signal converter 1301 are distributed to a plurality of types of wireless signals of communication broadcasting services by a plurality of wireless signal distributors 1302, respectively. . This distribution performs the conversion of the frequency band shown in FIG. 5, similarly to the radio signal distribution unit 402 of the mobile terminal 105.

Each of the distributed radio signals is transmitted to a plurality of radio signal coupling units 130 for each type of communication broadcast service.
3 and the signals of the respective communication broadcasting services are output to a plurality of terminals 1304.

In this embodiment, as in the case of the above-described downlink signal transmission, an amplifier can be provided, and conversion, distribution, and delay compensation can be performed. In particular, for the signal combined by the wireless signal combining unit 1303, the mobile terminal 105
The delay compensation of the time delay difference can be performed in the same manner as described above.

(Second Embodiment of Integrated Base Station for Uplink Signal Transmission) FIG. 14 is a block diagram of a second embodiment of the integrated base station 102 for uplink signal transmission. Note that, in FIG. 14, the parts performing the same functions as those in FIG. 13 are denoted by the same reference numerals.

As shown in FIG. 14, a plurality of local base stations 1
Optical signals transmitted from the optical fiber 04 via the optical fiber 103 are converted into wireless signals (electric signals) by an optical signal → wireless signal converter 1301.

The converted radio signal is added to an addition coupling section 1402
Are added and combined, and the combined wireless signal is distributed by a wireless signal distribution unit 1302 to terminals 1304 of a plurality of types of communication broadcasting services. Compared to the above embodiment,
Wiring is simple.

(Embodiment of Delay Compensation) Cellular phone and PHS
For example, in a two-way communication broadcasting service such as this, there are cases where there are a plurality of users who use the same integrated base station 102 or local base station 104. In such a case, a method of compensating for the time delay difference will be described with reference to FIG. Note that this method can be applied to the output of the terminal 1304 of the two embodiments of the integrated base station 102 for uplink signal transmission described above.

In the following, for convenience of explanation, the number of users is assumed to be 5, but this number can be arbitrarily changed, and the changed embodiment is also included in the scope of the present invention.

First, the signal output to the terminal 1304 is
The channel separation unit 1501 separates each user. For channel separation, a method corresponding to each of multiplexing methods of frequency multiplexing, time division multiplexing, and code division multiplexing is used.

Next, delay compensation is performed by the delay compensation unit 1502 on the separated signals for each user.

For example, consider a case where there are a plurality of users within a range where communication with two local base stations 104 is possible. Since the locations of these users are different, the time delay difference of the signal differs for each user. Therefore, since it is necessary to perform delay compensation for each user, channel separation is performed before delay compensation.

Thereafter, a signal subjected to delay compensation for each user is received and a corresponding communication broadcast service is provided.

It is to be noted that an amplifier can be provided before and after each unit as appropriate to compensate for the power reduction.

In the above embodiment, each section is configured by using a dedicated circuit. However, functions equivalent to those circuits can be achieved by an information processing device such as a computer.

When a computer or the like including an optical element or the like is used, the circuit of the above-described embodiment can be replaced with a general-purpose DSP (Digi
A tal Signal Processor (digital processing processor), a general-purpose optical element, an optical circuit, and the like can be appropriately combined based on a program to perform the same function as the circuit of the above embodiment.

That is, these computers and the devices connected thereto are controlled by the program recorded on the information recording medium of the present invention to control the integrated base station, local base station, mobile terminal, transmission method, A relay method and a receiving method can be realized. The program for the mobile terminal can be stored in a semiconductor memory such as a ROM, for example.

[0184]

As described above, according to the present invention,
A communication system, an integrated base station, a local base station, a mobile terminal, a transmission method, a relay method, a reception method, and an information recording medium can be provided.

In particular, a communication system suitable for realizing continuous road-to-vehicle communication by an optical fiber wireless communication technology for communicating with a vehicle or the like via a plurality of local base stations installed along a road or the like, an integrated base station, Local base station, mobile terminal, transmission method,
A relay method, a receiving method, and an information recording medium can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a schematic configuration of a first embodiment of a communication system of the present invention.

FIG. 2 is a block diagram illustrating a schematic configuration of an integrated base station for downlink signal transmission, an optical fiber, and a plurality of local base stations.

FIG. 3 is a block diagram showing a schematic configuration of a local base station for downlink signal transmission.

FIG. 4 is a block diagram showing a schematic configuration of a mobile terminal for downlink signal transmission.

FIG. 5 is an explanatory diagram showing a relationship between a frequency band of a signal of each communication broadcast service and a frequency band of a signal transmitted by wireless communication between a local base station and a mobile terminal.

FIG. 6 is a block diagram showing a schematic configuration of a second embodiment of the integrated base station for downlink signal transmission.

FIG. 7 is a configuration diagram showing a first embodiment of a wireless signal → optical signal converter.

FIG. 8 is a configuration diagram illustrating a second embodiment of the wireless signal → optical signal converter.

FIG. 9 is a block diagram showing a schematic configuration of a second embodiment of the mobile terminal for downlink signal transmission.

FIG. 10 is a block diagram showing a schematic configuration of a third embodiment of a mobile terminal for downlink signal transmission.

FIG. 11 is a block diagram showing a schematic configuration of an embodiment of a mobile terminal for uplink signal transmission.

FIG. 12 is a block diagram showing a schematic configuration of an embodiment of a local base station for uplink signal transmission.

FIG. 13 is a block diagram showing a schematic configuration of an embodiment of an integrated base station for uplink signal transmission.

FIG. 14 is a block diagram illustrating a schematic configuration of a second embodiment of the integrated base station for uplink signal transmission.

FIG. 15 is a block diagram showing a schematic configuration of a transmission time delay compensator in an integrated base station for uplink signal transmission having a plurality of channels.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 Communication system 102 Integrated base station 103 Optical fiber 104 Local base station 105 Mobile terminal 201 Terminal 202 Frequency conversion unit 203 Radio signal → optical signal conversion unit 204 Optical coupling unit 205 Optical branching unit 301 Receiver 302 Optical signal → Radio signal conversion Unit 303 transmission antenna 401 reception antenna 402 wireless signal distribution unit 403 communication broadcast terminal unit 601 wireless signal coupling unit 602 wireless signal → optical signal conversion unit 701 wireless signal → optical signal conversion unit 702 wireless signal 703 power supply 704 wireless signal superposition unit 705 semiconductor Laser 706 Optical signal 801 Wireless signal → optical signal converter 802 Wireless signal 803 External converter 804 Power supply 805 Semiconductor laser 806 Optical signal 807 Output optical signal 901 Delay compensator 1001 Receiving antenna 1002 Addition coupling unit 1101 Frequency conversion unit 1 102 wireless signal coupling section 1103 transmission antenna 1201 reception antenna 1202 wireless signal → optical signal conversion section 1203 transmission section 1301 optical signal → wireless signal conversion section 1302 wireless signal distribution section 1303 wireless signal coupling section 1304 terminal 1402 addition coupling section 1501 channel separation section 1502 Delay compensation unit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-9-224031 (JP, A) JP-A-63-229925 (JP, A) JP-A-9-162793 (JP, A) JP-A-7-229 240907 (JP, A) JP-A-9-219676 (JP, A) JP-A-7-254816 (JP, A) JP-A-10-4313 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04B ⁷ /24-7/26 H04Q 7/04-7/38 H04B 10/00 H04H 1/00

Claims (13)

(57) [Claims] 1. An integrated base station connected via an optical fiber to a plurality of local base stations for transmitting signals of a plurality of types of communication broadcasting services and transmitting the signals included in a predetermined frequency band. A plurality of receiving units each receiving a signal transmitted by the plurality of local base stations via the optical fiber; and a plurality of communication broadcast services of the plurality of received signals, respectively. An integrated base station, comprising: a plurality of distributing units for distributing signals of the plurality of types; and a plurality of combining units for combining the distributed signals of the plurality of types of communication broadcasting services for each type. 2. The integrated base station according to claim 1 , further comprising: a plurality of compensators for respectively compensating for a time delay difference between the combined signals of the plurality of types of communication broadcasting services. . 3. An integrated base station connected via an optical fiber to a plurality of local base stations for transmitting signals of a plurality of types of communication broadcasting services and transmitting the signals included in a predetermined frequency band. A plurality of receiving units each receiving a signal transmitted by the plurality of local base stations via the optical fiber; a combining unit combining the plurality of received signals; and A distributing unit that distributes signals to signals of the plurality of types of communication broadcasting services. 4. The integrated base station according to claim 3, characterized by further comprising a plurality of compensator for compensating each time delay difference of said distributed plurality of kinds of signals Telecommunications Service . 5. An integrated base station connected via an optical fiber to a plurality of local base stations for transmitting signals of a plurality of types of communication broadcasting services and transmitting signals included in a predetermined frequency band. A receiving method for receiving signals transmitted by the plurality of local base stations via the optical fiber, respectively, and transmitting the plurality of received signals to the plurality of types of communication. A receiving method, comprising: a distribution step of distributing a signal of a broadcast service, and a coupling step of coupling the distributed signals of the plurality of types of communication broadcast services for each type. 6. The method of receiving according to claim 5, characterized in that and a compensation step of compensating each time delay difference of the combined plurality of kinds of signals Telecommunications services. 7. An integrated base station connected via optical fibers to a plurality of local base stations for transmitting signals of a plurality of types of communication broadcasting services and transmitting signals included in a predetermined frequency band. A receiving method for receiving signals transmitted by the plurality of local base stations via the optical fibers, and a combining step of combining the received signals. A distribution step of distributing the combined signal to signals of the plurality of types of communication broadcast services. 8. The method of receiving according to claim 7, further comprising a, a compensation step of compensating each time delay difference of said distributed plurality of kinds of signals Telecommunications services. 9. An integrated base station connected via an optical fiber to a plurality of local base stations for transmitting signals of a plurality of types of communication broadcasting services and transmitting signals included in a predetermined frequency band. A computer-readable information recording medium having recorded thereon a program executed by the plurality of local base stations, receiving signals transmitted through the optical fiber, and receiving the plurality of signals, An information recording medium which stores a program for distributing signals of the plurality of types of communication broadcasting services and combining the distributed signals of the plurality of types of communication broadcasting services for each type. 10. The information recording medium according to claim 9 which records the combined plurality of kinds of program for further implementing the process of compensating each time delay difference of the signals of the communication broadcast service. 11. An integrated base station connected via an optical fiber to a plurality of local base stations for transmitting signals of a plurality of types of communication broadcasting services and transmitting signals included in a predetermined frequency band. A computer-readable information recording medium recording a program executed by the plurality of local base stations, receiving signals transmitted via the optical fibers, and receiving the plurality of received signals. And an information recording medium storing a program for realizing a process of distributing the combined signal to signals of the plurality of types of communication broadcasting services. 12. The information recording medium according to claim 11 which records the distributed plurality of kinds of program for further implementing the process of compensating each time delay difference of the signals of the communication broadcast service. Wherein said information recording medium, a compact disk, floppy disk, hard disk, magneto-optical disk, a digital video disk, magnetic tape, or claim 9, characterized in that the semiconductor memory
13. A computer-readable information recording medium on which the program according to any one of 12 is recorded.