JPH09238101A - In-tunnel radio system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the in-tunnel communication system quickly installed and removed by allowing a radio master station to interconnect a PBX and a radio channel, allowing a relay station to be provided with a PHS base station so as to branch/insert a PHS signal and sending the PHS signal via the radio channel. SOLUTION: A signal sent from a PBX 11 at the outside of a tunnel is given to a radio master equipment 2 in the tunnel via a cable. The radio master equipment 2 is provided with a 1st interface section CS-INF1 having a PHS/ radio interface converting function, multiplexes a plurality of received PBX signals, converts the frequency into an in-tunnel radio frequency and sends the converted signal to a repeater 3. The relay station is provided with a 2nd interface section CS-INF2 branching/inserting the reproduced PHS signal between repeaters 3 and the PHS base station CS is connected to the 2nd interface section CS-INF2 . The base station CS converts the PBX signal extracted by the 2nd interface section CS-INF2 into a PHS use radio frequency and sends the converted signal to a PHS terminal 5. An incoming channel is configured reverse to above and then a channel is configured between the PBX 11 and the PHS terminal 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-tunnel radio system used for communication between an arbitrary point in a tunnel and a management office outside the tunnel.

For example, when repairing or inspecting a large diameter water conduit, it is necessary to provide a communication line between the inside and outside of the water conduit to communicate with the outside. However, once this work is complete, these devices must be quickly removed in order to flush the water.

For this reason, it is necessary to provide a wireless system in a tunnel that can be quickly set up and removed.

[0004]

2. Description of the Related Art FIG. 9 is a block diagram of a conventional example. As shown in the figure, a PBX 11 and a transport terminal station 12 are installed at a tunnel outside control station, and a plurality of base devices 621 and 622 and mobile devices 631 and 632 are installed inside the tunnel. The base device is connected to the carrier terminal via the leakage cable 61, and is also connected to the mobile device via a wireless line.

When a person outside the tunnel talks with a person inside the tunnel, the person who wants to talk off-hooks the telephone Tel and calls the other party, and the voice signal is transmitted through the PBX 11, the carrier terminal 12, and the leakage cable 61. Then, it is sent to the base devices 621 and 622.

Therefore, the base unit 621, 622 to the mobile unit 63
A call is made to 1,632 at once, and the called party presses the press talk button to reply to the caller as a transmission state, so that the line is configured at this point and communication becomes possible.

On the other hand, when making a call from inside the tunnel to the outside of the tunnel, the caller in the tunnel can talk to the other party by following the same procedure as above.

[0008]

Here, in the case of using the system as described above to secure communication between an arbitrary point in the tunnel and a management office outside the tunnel, there are the following problems. It was When building a temporary line in a tunnel, a system using a wired line cannot be quickly set up and removed. In the case of a headrace, it is necessary to construct a line only during the repair / inspection period and immediately remove it when the work is completed, but it is difficult to respond quickly with a wired line.

An object of the present invention is to provide a wireless system in a tunnel that can be quickly set up and removed.

[0010]

According to a first aspect of the present invention, a wireless master device is provided with a first interface portion for performing mutual conversion between a personal handyphone system (PHS) interface and a wireless line interface.

Further, the relay device is provided with a first interface part and a branching / inserting part for branching / inserting the reproduced personal handyphone system signal.
Is provided, and the personal handyphone system base station is connected to the second interface portion.

Then, the personal computer transmitted between the exchange and the personal handyphone system base station is transmitted.
The handy phone system signal is transmitted via a wireless line.

A second aspect of the present invention is to provide a personal handyphone system base station provided with a transmitting portion, a receiving portion, and a first transmission / reception changeover switch outside the tunnel, and the base station is used as a switch and a cable. Connect to the line.

Further, the radio master device and the relay device are provided with a frequency conversion portion for converting between the radio frequency for the personal handyphone system and the relay frequency in the tunnel.

A third aspect of the present invention is the second invention within the above-mentioned radio master device.
The transmission / reception changeover switch of Then, the second transmission / reception changeover switch is configured to interlock with the first transmission / reception changeover switch.

In a fourth aspect of the present invention, a branch / route is provided in the relay device.
Provide a synthetic part. Then, the branching / combining part branches the signal of the relay frequency in the tunnel, part of it is sent to the lower relay device as it is, and the remaining part is converted to the radio frequency for the personal handyphone system, and the corresponding personal handy device is used. It is configured to send to the phone system terminal.

In a fifth aspect of the present invention, when a multi-carrier is generated in a receiving system in a relay device, a signal generated in the own device and a signal from a lower relay device are combined in an intermediate frequency band or a high frequency band. I chose

That is, according to the first aspect of the present invention, a wireless master device is provided with a first interface portion for performing mutual conversion of interfaces. Further, each relay device is provided with a second interface part having a first interface part and a branching / inserting part, and a personal handyphone system base station is connected to the second interface part.

Therefore, the signal for the personal handyphone system sent from the PBX is converted to the wireless line interface by the first interface portion in the wireless master station and then handled by the second interface portion in the relay device. The signal is branched and further converted into an interface for a personal handyphone system at the first interface.

As a result, the signal transmitted by the PBX is transmitted to the personal handyphone system terminal (PS) at the personal handyphone system frequency through the personal handyphone system base station.

On the other hand, the signal transmitted from the personal handyphone system terminal (PS) is the corresponding personal
Via the handyphone system base station (CS), the personal computer from the lower relay device can be
It is inserted in the signal for the handyphone system and sent to the PBX via the wireless master device.

The second aspect of the present invention is that a PBX is installed at a management office outside the tunnel.
In addition to the base station for personal handyphone system (C
S) is provided. This allows the wireless master device to
Radio frequency for handyphone systems (for example, 1.9GHz
The band signal is input.

For this reason, a radio frequency converter for a personal handyphone system / a relay frequency converter in a tunnel and a relay frequency in a tunnel / a radio frequency converter for a personal handyphone system are provided in the radio master unit and the relay unit, and・ Handyphone system base station (CS)
The radio frequency for the personal handyphone system sent by is directly transmitted to the personal handyphone system terminal.

In the third aspect of the present invention, a TDD (Time Division Duplex) switch is provided in the tunnel outside control station and the radio master unit so that time division duplex communication can be performed. This makes it more convenient than press talk communication.

In the third aspect of the invention, since the frequency conversion is performed by the local oscillation signal for each relay device, the deterioration of the frequency stability is superposed for each relay, and the deterioration of the stability becomes large. The problem to be called arises.

In the fourth aspect of the present invention, in order to reduce the deterioration of the frequency stability, the signal of the relay frequency in the tunnel received by the relay device is branched and directly sent to the lower relay device. As a result, it is not necessary to perform frequency conversion, and it is possible to reduce deterioration in the stability of the local oscillation signal.

In the fifth aspect of the present invention, multi-carrier generation is performed in an intermediate frequency band or a high frequency band.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing the essential parts of a first embodiment of the present invention, and FIG. 2 is a schematic view showing the essential parts of a relay device shown in FIG.
Is a main part configuration diagram of the second embodiment of the present invention, FIG. 4 is a main part configuration diagram of the third embodiment of the present invention, and FIG. 5 is a main part configuration diagram of the fourth embodiment of the present invention. 6 is a block diagram of the essential part of the fifth embodiment of the present invention (No. 1), FIG. 7 is a schematic diagram of the essential part of the embodiment of the fifth present invention (No. 2), and FIG. 8 is a schematic view of the fifth embodiment of the present invention. It is a principal part block diagram (3) of an Example.

The operation of FIGS. 1 to 8 will be described below. The same reference numerals denote the same objects throughout the drawings, the parts described in detail above will be briefly described, and the parts of the present invention will be described in detail.

Here, it is assumed that an exchange (hereinafter, abbreviated as PBX) in the figure is a PHS PBX and is transmitting / receiving a signal of, for example, 192 KHz × (the number of PHS base stations). PHS is a personal handyphone system, CS is a PHS base station, PS is a PHS terminal, CS INF ₁ is the first interface part, and CS-INF ₂ is the second interface part. Use PHS, CS, PS, CS INF respectively.

In FIG. 1, the PB at the tunnel outside management office
The plural series of PBX signals transmitted by X 11 are input to the wireless master device 2 in the wireless master station in the tunnel via the cable.
Since the wireless master device 2 has the CS-INF ₁ having the PHS / wireless interface conversion function,
After performing interface conversion and multiplexing on the PBX signal, the multiplexed signal is transmitted to the relay device 3 at the tunnel radio frequency.

The wireless interface is, for example,
The speed of the multiplexed signal is increased so that an error occurred in the wireless section can be measured, and a gap is provided, and an additional bit such as a parity bit is inserted therein. Further, the radio frequency in the tunnel is selected to be a frequency with a small propagation loss in the tunnel, for example, a microwave band.

The configuration of each relay device is as shown in FIG. That is, the relay device 3 amplifies the signal of the in-tunnel radio frequency transmitted by the radio master device by the reception unit 311.
After frequency conversion and conversion into an intermediate frequency band signal, the demodulation section 312 takes out the multiplexed signal and sends it to the separation section 313. The demultiplexing unit demultiplexes the multiplexed signal into multiple series of PBX.
Return to signal and send to CS-IFN ₂ 314.

Therefore, the CS-INF ₂ converts the interface into the CS interface and then extracts the PBX signal shown in FIG.
To CS. As a result, CS receives the input PBX signal.
Convert to PHS radio frequency (for example, 1.9 GHz band) and convert to PS 5
And the line from PBX to PS is built.

The CS-INF ₂ 314 shown in FIG. 2 converts the PBX signal that has not branched into a radio interface and then adds the multiplexed signal obtained by multiplexing in the multiplexing unit 315 to the modulation unit 316. The modulator 316 repeatedly modulates the carrier with the multiplexed signal and transmits the carrier as a transmission signal to the relay station 2 via the transmitter 317.

On the other hand, the in-tunnel radio frequency signal transmitted by the lower relay station 2 is received by the receiving section 327, the demodulating section 326,
Added to CS-INF ₂ 324 via separator 325. CS-IN
The F ₂ 324 inserts the signal from its own device into the signals of a plurality of sequences from the lower-level device, converts the radio interface, and sends the signal to the multiplexing unit 323.

The multiplexing unit 323 multiplexes the signals of each CS and transmits them to the wireless master device 2 in the wireless master station via the modulator 322 and the transmitter 321. Therefore, the wireless master device 2 in FIG. 1 operates in the same manner as the receiving side of the relay device 3 to take out a plurality of series of CS signals converted into a CS interface and send them out to the PBX in the tunnel outside management office via a cable. To do. This allows a call between the inside and outside of the tunnel.

In FIG. 3, CS is provided only in the tunnel outside office, and a frequency conversion part for converting the PHS radio frequency and the tunnel radio frequency is provided in the radio master station and each relay station, and each relay station is in the tunnel. The radio frequency is converted to PHS radio frequency so that communication with PS can be performed.

That is, the first frequency conversion part 21 for converting the PHS radio frequency to the radio frequency in the tunnel is transmitted to the radio master station 2.
The relay station is provided with a second frequency conversion part 332 and a first frequency conversion part 334 for converting the in-tunnel radio frequency to the PHS radio frequency.

Therefore, the radio master station is the first frequency conversion part.
At 21, the PHS radio frequency CS signal is frequency-converted into a tunnel radio frequency and transmitted to the relay station 1. The relay station 1 uses the second frequency conversion section 332 to transfer the radio frequency in the tunnel to the PHS.
After frequency conversion to radio frequency, it is branched at Hybrid 333, one CS signal is sent to PS 5, and the other CS signal is sent.
The first frequency conversion unit 334 repeats the conversion into the in-tunnel radio frequency and the transmission to the relay station 2.

In FIG. 4, the CS inside the tunnel outside management office
The transmission portion 421, the receiving portion 422, but comprises a switch SW _1, the switch SW ₁ is for performing TDD (Time Division Duplex).

Therefore, the transmission / reception switching signal generated inside the CS is applied to the switch SW ₂ provided in the radio master station in the tunnel via the cable. As a result, TDD transmission / reception switching is linked with switch SW ₁ .

For example, when the two switches SW ₁ and SW ₂ are both transmitting sides, the CS of the PHS radio frequency transmitted by the CS in the tunnel outside control office
The signal passes through the switch SW ₁ , the switch SW ₂ in the radio master station through the cable, the frequency converter 231, the local oscillator 232,
A band pass filter BPF ₁ and an amplifier 233 are added to the transmission side, where the frequency is converted to the radio frequency in the tunnel and transmitted to the relay station 1.

The relay station 1 has a downstream configuration of amplifiers 341,
Frequency converter 342, local oscillator 343, band pass filter BP
F ₃ , variable gain amplifier 344, hybrid 345, frequency converter
346, local oscillator 347, band pass filter BPF ₄ , amplifier 348
The input radio frequency in the tunnel is
It returns to the CS signal of the HS radio frequency, branches at the hybrid 345, sends one CS signal to PS 5, converts the other CS signal to the tunnel radio frequency, and sends it to the relay station 2.

On the contrary, when both switches SW ₁ and SW ₂ are on the receiving side, the configuration of the relay station 1 in the upstream direction is such that the amplifier 357, the frequency converter 355, the local oscillator 356, the band pass filter BPF. ₆ , variable gain amplifier 354, hybrid 353, frequency converter 351, local oscillator 352, band pass filter BPF ₅ , and converts the received radio frequency in the tunnel from relay station 2 into PHS radio frequency. This signal is combined with the signal received by the device itself in the hybrid 353, then converted again into the tunnel radio frequency and transmitted to the radio master station.

In the radio master station, the radio frequency in the tunnel is returned to the PHS radio frequency through the amplifier 244, the frequency converter 242, the local oscillator 243, the band pass filter BPF ₂ and the variable gain amplifier 241, and the TDD changeover switch SW ₂ The signal sent by each PS is transmitted to the CS inside the tunnel outside the office via.

Here, in the method shown in FIG. 4, since the stability of the local oscillator signal for each relay device is superimposed, the overall stability deteriorates. FIG. 5 shows a way to improve this. FIG.
Is a modification of the hybrid connection position in Figure 4,
Only the part numbers necessary for the explanation are given.

In FIG. 5, a signal of the radio frequency in the tunnel received by the relay station 1 is branched by the hybrid 345 via the amplifier 341, and one signal is a frequency conversion part composed of the frequency converter 342 and the local oscillator 343. Converted to PHS radio frequency and sent to PS using transmit anna.

The other signal is a bandpass filter BPF ₄
The signal is amplified as it is via the. As a result, it is not necessary to perform frequency conversion, and it is possible to reduce deterioration in the stability of the local oscillation signal.

On the other hand, in the receiving system, the signal received from the PS is converted into the in-tunnel radio frequency by the frequency conversion part composed of the frequency converter 351 and the local oscillator 352. Then, this signal and the received radio frequency signal in the tunnel from the relay station 2 are combined by the hybrid 353 and sent to the radio master station.

Although FIGS. 4 and 5 show a method of transmitting only one CS signal, a method of multiplexing a plurality of CSs is shown in FIGS.
Shown in In FIG. 6, the transmission system consists of multiple lines from PBX 11.
Send the PBX signal to CS-INF ₁ in the wireless master station via the cable. The CS-INF ₁ performs interface conversion and then synthesizes the outputs of the respective modulators 261 with the synthesis board 281.

Then, the frequency of the combined output (multicarrier) is converted into the radio frequency in the tunnel through the frequency converter 282, the local oscillator 283, the band pass filter BPF ₇ , and the amplifier 284, and the signal is sent to the relay station 1. .

In the relay station 1 shown in FIG. 7, the received signal of the radio frequency in the tunnel is branched by the hybrid 252, and one signal is the signal of the intermediate frequency f1 in the frequency conversion part including the frequency converter 253 and the local oscillator 254. Converted to demodulator
256, CS-INF ₂ Used for CS-PS communication via _2nd board 257.

The other signal is passed through the band pass filter 25 as it is.
The signal is amplified via the amplifier 259 and transmitted to the relay station 2. On the other hand, the received signal of the radio frequency in the tunnel from the relay station 2 is an intermediate frequency signal via the frequency conversion part including the amplifier 269, the frequency converter 267, and the local oscillator 268, the band pass filter BPF ₁₀ , and the variable gain amplifier 266. Input to the hybrid 264 after being converted to.

This hybrid 264 has PS, CS, CS
-The signal from the PS converted to the intermediate frequency via INF ₂ and modulator 265 is also added, so the two signals are combined and passed through frequency converter 262, local oscillator 263, band pass filter BPF ₉ and amplifier 261. Then, it is converted into the radio frequency in the tunnel again and transmitted to the radio master station in FIG.

Therefore, the receiving system of the wireless master station receives the received signal from the relay station 1 from the amplifier 294, frequency converter 292, local oscillator.
The frequency conversion part consisting of 293, band-pass filter PBF ₈ converts it to an intermediate frequency signal, separates it into each carrier with separator 291 and demodulates it with the corresponding demodulator 271 and CS
Convert the interface -INF ₁ 25, via a cable
Send to PBX 11.

As described above, in FIG. 7, the multi-carrier synthesis is performed in the intermediate frequency band, but in FIG. 8, the hybrid 264 is provided in the subsequent stage of the frequency conversion section consisting of the frequency converter 262 and the local oscillator 263. It was done in the high frequency band.

With this configuration, it is not necessary to convert the signal from the lower relay station 2 into the intermediate frequency,
Since it can be added directly to the hybrid, the circuit scale can be reduced.

[0059]

As described in detail above, according to the present invention, when a temporary line is constructed in a tunnel, it can be set up quickly.
There is an effect that a wireless system in a tunnel that can be removed can be provided.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a main part of a first embodiment of the present invention.

2 is a main part configuration diagram of a relay device in FIG. 1. FIG.

FIG. 3 is a configuration diagram of a main part of an embodiment of the second present invention.

FIG. 4 is a configuration diagram of a main part of the third embodiment of the present invention.

FIG. 5 is a configuration diagram of main parts of an embodiment of the fourth present invention.

FIG. 6 is a configuration diagram of a main part of a fifth embodiment of the present invention (No. 1)
It is.

FIG. 7 is a main part configuration diagram of a fifth embodiment of the present invention (No. 2)
It is.

FIG. 8 is a configuration diagram of a main part of a fifth embodiment of the present invention (part 3)
It is.

FIG. 9 is a configuration diagram of a conventional example.

[Explanation of symbols]

2 Radio master station 3 Relay station 5 Personal handyphone system terminal station 11 Switch 42 Personal handyphone system base station 61 Cable 622 Base unit CS-INF ₁ First interface part CS-INF ₂ Second interface part SW ₁ First transmission / reception selector switch SW ₂ Second transmission / reception selector switch

Front page continuation (72) Inventor Norio Sasaki 2-12-19 Minatomachi, Aomori-shi, Aomori Tohoku Electric Power Co., Inc. Aomori Information and Communication Center (72) Inventor Takao Shibuya 2-12-19 Minatomachi, Aomori-shi, Aomori Tohoku Electric Power Co., Ltd. Aomori Branch (72) Inventor Rikihiko Majima 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Fujitsu Limited

Claims (5)

[Claims] 1. A switch outside the tunnel is connected to the switch inside the tunnel via a wired line, a wireless master device having a transmitting / receiving part, and a plurality of wireless master devices connected to the wireless master device via a wireless line. In a wireless system in a tunnel provided with respective relay devices, the wireless master device is provided with a first interface portion for performing mutual conversion between a personal handyphone system (PHS) interface and a wireless line interface. Is provided with a second interface portion having the first interface portion and a dropping / inserting portion for dropping / inserting a signal for a personal handyphone system, and the second interface portion is provided with a personal handyphone Connect the system base station, and connect the exchange and the personal handyphone system base station. -A wireless system in a tunnel, which is configured to transmit a signal for a personal handyphone system via a wireless line. 2. The in-tunnel radio system according to claim 1, wherein a transmission part, a reception part, and a first transmission / reception switching switch are provided outside the tunnel.
A system base station is provided to connect to a switching system and a wired line, and a frequency conversion part for converting between a radio frequency for a personal handyphone system and a relay frequency in a tunnel is provided in a radio master device and a relay device. A wireless system in a tunnel characterized by the above. 3. The in-tunnel radio system according to claim 2, wherein a second transmission / reception changeover switch is provided in the wireless master device, and the second transmission / reception changeover switch is interlocked with the first transmission / reception changeover switch. A wireless system in a tunnel characterized by the above. 4. The in-tunnel radio system according to claim 1, wherein a branching / combining portion is provided in the relay device, the branching / combining portion branches a signal of a relay frequency in the tunnel, and a part of the lower relay is used as it is. Send it to the device and convert the rest to radio frequencies for personal handyphone systems,
A wireless system in a tunnel, which is configured to transmit to a corresponding terminal for a personal handyphone system. 5. The in-tunnel radio system according to claim 1, wherein when a multi-carrier is generated in a receiving system in the relay device, a signal generated in the own device and a signal from a lower relay device are transmitted in an intermediate frequency band. Alternatively, an in-tunnel radio system characterized by being configured to combine in a high frequency band.