JPH07135476A - Wireless communication device - Google Patents

Abstract

(57) [Abstract] [Purpose] The reliability of a simple installation type ultra-small wireless communication device having a dual structure for working lines and protection lines, and consisting of outdoor devices and indoor devices. It aims to improve and reduce total cost. A first indoor device 1 including a modulation / demodulation unit and a monitoring control unit, and a first outdoor device 3 connected to the first indoor device 1 by a coaxial cable 2 and including a frequency conversion unit and a monitoring control unit. A second indoor device 4 including a modulation / demodulation unit and a monitoring control unit; and a second outdoor device 6 including a frequency conversion unit and a monitoring control unit, which is connected to the second indoor device 4 by a coaxial cable 5; The side is connected to the first indoor unit 1 and the second indoor unit 4, the other side is connected to the baseband signal processing side, and the baseband signal processing side is the first indoor unit 1
Alternatively, the changeover switch 7 connected to the second indoor unit 3
And a control means 8 for actuating the changeover switch 7 based on the respective status signals of the first indoor unit 1, the first outdoor unit 3, the second indoor unit 4, and the second outdoor unit 6. .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication device having a dual structure for a working line and a protection line, and particularly to a simple installation type microminiature wireless communication device consisting of an outdoor device and an indoor device. Regarding

In recent years, with the spread of various wireless communication networks such as mobile communication networks, there has been a demand for small capacity data communication means. Such data communication means are required to be easy to install, have low maintenance cost, have high reliability of the device, have low cost, and have small size.

In order to meet such demands, it is not necessary to provide a wireless communication device indoors and connect the antenna and the wireless communication device with a waveguide as in the past, and to place the wireless communication device close to the antenna in an outdoor device. And an indoor device installed separately from this, and at least a frequency conversion unit is arranged in the outdoor device, at least a modulation / demodulation unit is arranged in the indoor device, and both are connected by a coaxial cable for transmitting an IF signal. A connected wireless communication device is provided.

[0006] Further, a spare line is added to such a wireless communication device to improve reliability.

[0005]

2. Description of the Related Art FIG. 10 shows an example of a conventional wireless communication device including an outdoor device and an indoor device. In the figure, the indoor device (I
DU) 100 includes a modulation unit (MOD) 101 and a demodulation unit (D)
An EM) 102, a synthesis / demultiplexing unit (S / D) 103, a power supply unit (PS) 104, and a monitor control unit (SV) 105. Further, the outdoor unit (ODU) 110 includes a transmission frequency conversion unit (U / C) 111 and a reception frequency conversion unit (D).
/ C) 112, a synthesis / demultiplexing unit (S / D) 113, a power supply unit (PS) 114, a monitor control unit (SV) 115, and a circulator 116. The indoor device 100 and the outdoor device 110 are connected by a single coaxial cable 120, and the outdoor device 110 is connected to the transmission / reception shared antenna 130 and installed near the transmission / reception shared antenna 130.

In the above configuration, at the time of transmission, the input baseband signal is modulated by the modulator 101 of the indoor unit 100 and output as an IF signal to the synthesizer / demultiplexer 103. In addition to the synthesizing / demultiplexing unit 103, a DC power supply signal for the outdoor device 110 is added from the power supply unit 104, and an SV signal for controlling the outdoor device 110 is added from the monitoring control unit 105. The monitoring control unit 105 monitors and controls the indoor device 100 based on the state information, and sends the outdoor device 11 that is sent.
The outdoor device 110 is monitored based on the state information of 0, and the control signal is sent to the outdoor device 110 as an SV signal. The frequency band of the IF signal is set higher than that of the SV signal.
The combining / branching unit 103 combines these three signals and sends them to the outdoor device 110 via the coaxial cable 120.

The synthesis / demultiplexing unit 113 of the outdoor unit 110 is
The sent composite signal is separated using the frequency difference, the IF signal is sent to the transmission frequency conversion unit 111, the DC power supply signal is sent to the power supply unit 114, and the SV signal is sent to the monitoring control unit 115. The transmission frequency conversion unit 111 converts the IF signal into an RF signal and sends it to the transmission / reception shared antenna 130 via the circulator 116. On the other hand, the power supply unit 114 supplies the sent DC power supply signal to each unit of the outdoor device 110, and the monitoring control unit 115 supplies the SV signal.
Various operation controls of the outdoor device 110 are performed according to the signal.

Next, at the time of reception, the RF signal is input to the reception frequency conversion unit 112 via the transmission / reception shared antenna 130 and the circulator 116, and the reception frequency conversion unit 1
Reference numeral 12 converts the RF signal into an IF signal, and the synthesis / demultiplexing unit 11
Output to 3. In addition, the SV signal of the state information of the outdoor device 110 is added from the monitoring control unit 115 to the synthesis / demultiplexing unit 113, and the frequency band of the SV signal is set lower than that of the IF signal here as well. The synthesis / demultiplexing unit 113 is S
The V signal and the IF signal are combined and sent to the indoor device 100 via the coaxial cable 120.

The synthesizer / demultiplexer 103 of the indoor unit 100 is
The sent composite signal is separated by using the frequency difference, the IF signal is sent to the demodulation unit 102, and the SV signal is sent to the monitoring control unit 105. The demodulation unit 102 demodulates the IF signal and outputs a baseband signal, and the monitoring control unit 105 extracts the state information of the outdoor device 110 from the SV signal.

As described above, the conventional wireless communication device is divided into two devices, an indoor device and an outdoor device, from the viewpoints of easy installation work, easy handling, etc. Functions are implemented in each case. Further, the connection between the indoor device and the outdoor device can be made with one coaxial cable by frequency-multiplexing the IF signal, the SV signal, and the DC power supply signal, which are the main signals for transmission and reception, which facilitates the laying work. There is.

On the other hand, with the recent increase in the density of transmitted information,
There is a demand for improved system reliability, and in response to this demand, wireless communication devices have been configured in a redundant configuration.
FIG. 11 shows a conventional wireless communication device having a duplex configuration. In the figure, indoor device 200, outdoor device 210, coaxial cable 2
Reference numeral 20 constitutes a first line, and the indoor device 240, the outdoor device 250 and the coaxial cable 260 constitute a second line. Indoor devices 200, 240
10 has the same internal configuration as the indoor device 100 of FIG. 10, and the outdoor devices 210 and 250 have the same internal configuration as the outdoor device 110 of FIG.

The changeover switch (SW) 270 is a changeover switch for sending the transmission baseband signal to one of the first line and the second line, and the changeover switch (SW) 280 is the reception baseband signal. Is a changeover switch for receiving from the one of the first line and the second line. Also, a changeover switch (SW) 290
Sends out a transmission RF signal from one of the outdoor device 210 and the outdoor device 250 to the shared antenna for transmission / reception 230, and a received RF signal from the shared antenna for transmission / reception 230 in the outdoor device 210 and the outdoor device 250. It is a changeover switch for sending to one side. The changeover control unit (CONT) 300 includes changeover switches 270, 280,
The control unit sends a switching signal to the switch 290 and switches the switches. The switching control unit 300 uses the indoor device 2
00, 240 from the respective monitoring control units to the indoor units 200, 2
Receiving an alarm signal included in 40 status information,
The outdoor unit 21 is connected to the outdoor unit 21 via the respective monitoring units of the indoor units 200 and 240.
Receive the alarm signal included in the status information of 0,250,
The changeover switches 270, 280, 290 are operated according to these alarm signals and a predetermined changeover logic set in advance.

The changeover switches 270 and 280 are for changing over the baseband signal and are realized by a combination of AND circuits. On the other hand, the changeover switch 290 is for changing over the RF signal, and is a motor drive changeover switch (electric coaxial type changer, electric waveguide type changer) for mechanically changing the coaxial cable or the waveguide or a PIN diode or the like. It is realized by a semiconductor switch using. In addition,
The changeover switch 290 is required to have a low loss in both the transmission system from the viewpoint of output level and the reception system from the viewpoint of noise figure (NF), and is usually a coaxial type or waveguide type low loss switch. A switch is adopted.

The changeover switch 290 is used for the outdoor unit 2
Since it is provided in the vicinity of 10, 250 and the transmitting / receiving shared antenna 230, the control line of the changeover switch 290 is required from the indoor side switching control unit 300 to the outdoor side.

With such a configuration, when a failure occurs in the working line, an automatic alarm signal from the working line side can be used without the need for the maintenance person to immediately go to the site to switch to the protection line. Since it is switched to the protection line side, the time from the failure occurrence to the restoration is short, and the system down time can be shortened.

[0016]

However, in the conventional device, a coaxial type or waveguide type changeover switch is used for changing over the RF signal as the changeover switch 290, but these changeover switches are expensive. Also, there is a problem that reliability is low because it operates mechanically.
In addition, the control line connected to the changeover switch 290 must be separately installed from the indoor side to the outdoor side, and in order to install the changeover switch 290 outdoors, it must have a drip-proof structure, both of which are expensive. There was a problem of inviting.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wireless communication device with improved reliability and reduced total cost.

[0018]

FIG. 1 is a diagram for explaining the principle of the present invention made to achieve the above object.

FIG. 1A shows a first wireless communication device,
This includes a first indoor unit 1 for a first line including at least a modulation / demodulation unit and a supervisory control unit, and a first indoor unit 1.
A first outdoor device 3 for a first line, which is connected to the same by a coaxial cable 2 and includes at least a frequency conversion unit and a monitoring control unit, and a second outdoor unit 3 for a second line including at least a modulation / demodulation unit and a monitoring control unit. Second indoor unit 4 connected to the second indoor unit 4 by a coaxial cable 5, and a second outdoor unit 6 for a second line including at least a frequency conversion unit and a monitoring control unit.
And one side of the first indoor unit 1 and the second indoor unit 4
And a changeover switch 7 that connects the other side to the baseband signal processing side and connects the baseband signal processing side to the first indoor unit 1 or the second indoor unit 4, and
Connected to the indoor unit 1 and the second indoor unit 4 of
Receives the status signals of the first indoor unit 1 and the first outdoor unit 3 from the respective monitor control units of the indoor unit 1 and the first outdoor unit 3, and also the second indoor unit 4 and the second outdoor unit 6
The control means 8 receives the status signals of the second indoor unit 4 and the second outdoor unit 6 from each of the monitoring control units and operates the changeover switch 7 based on these status signals.
Reference numerals 9 and 10 represent antennas for both transmission and reception.

In the first wireless communication device, the conventional outdoor side RF signal changeover switch (changeover switch 29 in FIG. 11) is used.
0) and the switching control line of this switch are unnecessary.

FIG. 1B shows a second wireless communication device, which includes a first outdoor device 11 for a first line including at least a frequency conversion unit and a monitoring control unit, and at least a frequency conversion device. Second outdoor device 12 for the second line including the control unit and the monitoring control unit, the indoor device 13 including at least the modulation and demodulation unit and the monitoring control unit, and the indoor device 1 on one side.
3 and the other side is connected to the first outdoor unit 11 and the second outdoor unit.
Switch 16 for connecting the indoor unit 13 to the first outdoor unit 11 or the second outdoor unit 12 by connecting the outdoor unit 12 to the outdoor unit 12 via coaxial cables 14 and 15, respectively.
And a status signal of the first outdoor device 11 and the second outdoor device 12 that is included in the monitoring control unit of the indoor unit 13 and receives the status signals of the first outdoor unit 11 and the second outdoor unit 12 from each monitoring control unit of the first outdoor unit 11 and the second outdoor unit 12. , Changeover switch 1 based on each of these status signals
And switching control means for activating 6. Reference numeral 17,
Reference numeral 18 denotes a transmission / reception shared antenna.

In the second wireless communication device, the indoor device is more reliable than the outdoor device and the maintenance work is easy, so that the indoor device is not duplicated. We are trying to provide low cost equipment.

Further, FIG. 1C shows a third wireless communication device, which includes a first outdoor device 19 for the first line including at least a frequency conversion unit and a monitor control unit, and at least a frequency conversion device. Second outdoor device 20 for the second line including the control unit and the monitoring control unit, an indoor device 21 including at least the modulation / demodulation unit and the monitoring control unit, and one side is connected to the indoor device 21 via a coaxial cable 22. And the changeover switch 23 that connects the other side to the first outdoor device 19 and the second outdoor device 20 and connects the indoor device 21 to the first outdoor device 19 or the second outdoor device 20; Connected to the outdoor unit 19 and the second outdoor unit 20,
Control for receiving the status signals of the first outdoor device 19 and the second outdoor device 20 from the respective monitoring controllers of the outdoor device 19 and the second outdoor device 20 and operating the changeover switch 23 based on these status signals. And means 24. Reference numerals 25 and 26 indicate antennas for both transmission and reception.

In the third wireless communication device, a single coaxial cable connecting the indoor device and the outdoor device is used to facilitate installation work and provide a low-cost device.

[0025]

In the structure shown in FIG. 1A, when the first line is the working line, the changeover switch 7 controls the baseband signal processing side to the first indoor unit under the control of the control means 8. Connected to 1. As a result, at the time of transmission, the baseband signal is modulated by the first indoor device 1 for the first line, sent as an IF signal to the first outdoor device 3 via the coaxial cable 2, and the first outdoor device 3 Is frequency-converted and transmitted from the transmitting / receiving antenna 9 as an RF signal. Further, at the time of reception, the RF signal from the transmission / reception shared antenna 9 is frequency-converted by the first outdoor device 3 and I
First indoor unit 1 via coaxial cable 2 as F signal
Is sent to the baseband signal processing side as a baseband signal after being demodulated by the first indoor unit 1.

Here, the control means 8 controls the first indoor unit 1
Or when an alarm signal is received from the first outdoor device 3,
The control means 8 issues a command to the changeover switch 7 to switch to the protection line, and the baseband signal processing side is set to the second side.
Is connected to the indoor device 4 of. As a result, instead of the first indoor unit 1 and the first outdoor unit 3, the second indoor unit 4 and the second outdoor unit 6 operate in the same manner as above.

In the configuration shown in FIG. 1B, when the first line is the working line, the changeover switch 16 is controlled by the changeover control means included in the monitoring control section of the indoor unit 13. , The indoor unit 13 is connected to the first outdoor unit 11. As a result, at the time of transmission, the baseband signal is modulated by the indoor device 13 and sent as an IF signal to the first outdoor device 11 via the coaxial cable 14 for the first line. The converted signal is transmitted from the transmission / reception shared antenna 17 as an RF signal. Further, at the time of reception, the RF signal from the transmission / reception shared antenna 17 is frequency-converted by the first outdoor device 11 and is converted into an IF signal by the indoor device 13 via the coaxial cable 14.
To the indoor unit 13 and demodulated by the indoor unit 13 and output as a baseband signal.

When the switching control means of the indoor unit 13 receives the alarm signal from the first outdoor unit 11,
The changeover control means issues a command to the changeover switch 16 to change over to the protection line, and the indoor unit 13 is connected to the second outdoor unit 12. Thereby, instead of the first outdoor unit 11, the second outdoor unit 12 operates in the same manner as above.

Further, in the structure shown in FIG.
For example, when the first line is the working line, the changeover switch 23 connects the indoor device 21 to the first outdoor device 19 under the control of the control means 24. As a result, at the time of transmission, the baseband signal is modulated by the indoor device 21, and the first signal is transmitted via the coaxial cable 22 as an IF signal.
No. 1 is transmitted to the outdoor device 19, is subjected to frequency conversion by the first outdoor device 19, and is transmitted from the transmission / reception shared antenna 25 as an RF signal. In addition, when receiving, the transmission / reception shared antenna 2
The RF signal from 5 is frequency-converted by the first outdoor device 19 and sent as an IF signal to the indoor device 21 via the coaxial cable 22, demodulated by the indoor device 21 and output as a baseband signal.

Here, the control means 24 controls the first outdoor unit 1
When receiving the alarm signal from 9, the control means 24 issues a command to the changeover switch 23 to switch to the protection line, and the indoor unit 21 is connected to the second outdoor unit 20. This replaces the first outdoor device 19 with the second outdoor device 19.
The outdoor device 20 operates in the same manner as above.

[0031]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram of a first embodiment of the present invention corresponding to the first wireless communication device shown in FIG. In the figure, the same parts as those shown in FIG. 1A are designated by the same reference numerals.

In the figure, a first indoor unit (IDU) 1 includes a modulator (MOD) 1a, a demodulator (DEM) 1b, a combiner / demultiplexer (S / D) 1c, a power supply (PS) 1d, And a supervisory control unit (SV) 1e. In addition, the first outdoor unit (ODU) 3 uses the transmission frequency conversion unit (U / C) 3
a, reception frequency conversion unit (D / C) 3b, synthesis / demultiplexing unit (S / D) 3c, power supply unit (PS) 3d, monitoring control unit (S
V) 3e and a circulator 3f.
The first indoor device 1 and the first outdoor device 3 are connected by a single coaxial cable 2, and the first outdoor device 3 is connected to the transmission / reception shared antenna 9 and near the transmission / reception shared antenna 9. Is installed.

The second indoor unit (IDU) 4 and the second outdoor unit (ODU) 6 have the same internal configuration as that of the first indoor unit 1 and the first outdoor unit 3, respectively. .

The first indoor unit 1, the first outdoor unit 3 and the coaxial cable 2 constitute a first line, and the second indoor unit 4, the second outdoor unit 6 and the coaxial cable 5 are also included.
Constitutes the second line.

The changeover switch 7 is a transmission changeover switch 7a.
And a receiving changeover switch 7b. The transmitting changeover switch 7a is a changeover switch for sending the transmission baseband signal to one of the first line and the second line, and the receiving changeover switch 7b is , A changeover switch for receiving the received baseband signal from one of the first line and the second line. Switching control unit (CON
T) 8 is a control unit that sends a changeover signal to the transmission changeover switch 7a and the reception changeover switch 7b to change over these switches. The switching control unit 8 receives an alarm signal included in the status information of the first indoor unit 1 and the second indoor unit 4 from each monitoring control unit (SV) of the first indoor unit 1 and the second indoor unit 4. In addition, the first indoor unit 1 and the second indoor unit 4 receive the first indoor unit 3 and the second outdoor unit 6 from the respective monitoring controllers via the respective monitoring controllers of the first indoor unit 1 and the second indoor unit 4. The alarm signals included in the state information of the outdoor device 3 and the second outdoor device 6 are received, and the transmission changeover switch 7a and the reception changeover switch 7b are operated in accordance with these alarm signals and a predetermined changeover logic set in advance. .

The transmission changeover switch 7a and the reception changeover switch 7b are for changing over the baseband signal.
It is realized by a combination of ND circuits. In the above configuration, if the first line is the working line, the changeover switch 7 connects the baseband signal processing side to the first indoor unit 1 under the control of the control means 8. That is, the transmission changeover switch 7a and the reception changeover switch 7b are arranged at the solid line positions shown in FIG. As a result, at the time of transmission, the input baseband signal is modulated by the modulator 1a of the first indoor unit 1 and is combined / demultiplexed by the combiner / demultiplexer 1 as an IF signal.
It is output to c. In addition to the combining / branching unit 1c, the power supply unit 1
The DC power supply signal for the first outdoor device 3 is added from d, and the SV signal for controlling the first outdoor device 3 is added from the monitoring controller 1e. The monitoring controller 1e monitors and controls the first indoor unit 1 based on the state information, and also monitors the first outdoor unit 3 based on the state information of the first outdoor unit 3 sent to the first outdoor unit 1. The control signal is sent to the device 3 as an SV signal. The combining / branching unit 1c combines these three signals and sends them to the first outdoor unit 3 via the coaxial cable 2.

FIG. 3 is a diagram showing the frequency distribution of these three signals. That is, the frequency of the DC power supply signal is 0, and the frequency band of the IF signal is set higher than that of the SV signal. Further, in the IF signal, the transmission signal is set higher than the reception signal. Further, although one SV signal is displayed in FIG. 3, it is actually directed from the outdoor device to the indoor device,
It is composed of a status information signal including an alarm signal and a control information signal for instructing various controls from the indoor unit to the outdoor unit, which are also transmitted at different frequencies.

Returning to FIG. 2, the synthesis of the first outdoor unit 3
The demultiplexing unit 3c separates the transmitted combined signal by using the frequency difference, and sends the IF signal to the transmission frequency conversion unit 3a, the DC power supply signal to the power supply unit 3d, and the SV signal to the monitoring control unit 3e. The transmission frequency converter 3a converts the IF signal into an RF signal and transmits / receives the shared antenna 9 via the circulator 3f.
Send to. On the other hand, the power supply unit 3d supplies the sent DC power supply signal to each unit of the first outdoor device 3, and the monitoring control unit 3e causes the SV to operate.
Various operation controls of the first outdoor unit 3 are performed according to the signal.

Next, at the time of reception, the RF signal is input to the reception frequency conversion section 3b via the transmission / reception shared antenna 9 and the circulator 3f, and the reception frequency conversion section 3b receives the R signal.
The F signal is converted into an IF signal and output to the synthesis / demultiplexing unit 3c. In addition, the SV signal of the state information of the first outdoor device 3 is added from the monitoring controller 3e to the synthesizer / demultiplexer 3c. The synthesizing / demultiplexing unit 3c synthesizes the SV signal and the IF signal having different frequency bands and sends them to the first indoor unit 1 via the coaxial cable 2.

The synthesis / demultiplexing unit 1c of the first indoor unit 1 is
The sent composite signal is separated using the frequency difference, the IF signal is sent to the demodulation unit 1b, and the SV signal is sent to the monitoring control unit 1e.
The demodulation unit 1b demodulates the IF signal and outputs a baseband signal, and the monitoring control unit 1e uses the SV signal to output the first outdoor unit 3
The state information of is taken out and output to the control means 8 when an alarm signal is included. Further, the monitor control unit 1e outputs an alarm signal to the control means 8 when the status information of the first indoor unit 1 of itself includes the alarm signal.

Here, the control means 8 controls the first indoor unit 1
Or when an alarm signal is received from the first outdoor device 3,
The control means 8 issues a command to the changeover switch 7 to switch to the protection line, and the baseband signal processing side is set to the second side.
Is connected to the indoor device 4 of. As a result, instead of the first indoor unit 1 and the first outdoor unit 3, the second indoor unit 4 and the second outdoor unit 6 operate in the same manner as above.

In the first embodiment as described above, the conventional outdoor side RF signal changeover switch (changeover switch 290 in FIG. 11) and the changeover control line for this switch are unnecessary. Further, in a wireless communication device which mainly uses a quasi-millimeter wave or a shorter radio wave (frequency of about 10 GHz or more), an outdoor device can be manufactured in a very small size, and an antenna has a small size (30 to 30). 90 cm),
It is easy to install two units. Therefore, the outdoor device can be duplicated and each outdoor device can be configured by a conventional mass-produced outdoor device. As a result, the mass production effect of the outdoor device can be expected.

FIG. 4 is a flow chart showing a procedure of outputting a changeover command to the changeover switch 7 performed by the control means 8. Each step will be described. [S1] The first indoor unit 1 of the first line is provided to the control means 8.
Alternatively, it is determined whether or not the alarm signal is sent from the first outdoor device 3, and the alarm signal is not sent (Y
If es), the process proceeds to step S2 and is sent (N
If o), go to step S3.

[S2] The control means 8 sends the second line of the second line.
It is determined whether the alarm signal is sent from the indoor device 4 or the second outdoor device 6 of No., and if the alarm signal is not sent (Yes), the process proceeds to step S4, and if it is sent (No). If so, go to step S5.

[S3] The control means 8 is provided with the second line of the second line.
It is determined whether or not an alarm signal is sent from the indoor unit 4 or the second outdoor unit 6 of No., and if the alarm signal is not sent (Yes), the process proceeds to step S6, and if it is sent (No). ) Proceed to step S7.

[S4] Since there is no abnormality in the first line and the second line, the current state is maintained without switching. [S5] Since the second line has an abnormality and the first line has no abnormality, the first line is switched.

[S6] Since there is an abnormality in the first line and no abnormality in the second line, the switch is switched to the second line. [S7] There is an abnormality in the first line and the second line. Maintain the current status without switching.

In FIG. 2, even on the protection line side, power is supplied to the indoor unit and the outdoor unit on the protection line side, and an SV signal is transmitted and received between the indoor unit and the outdoor unit. Be seen. Although the baseband signal is not input to the protection line side, in order to prevent unnecessary radio waves such as noise from being output from the antenna from the outdoor device on the protection line side, the indoor device on the protection line side is An instruction to stop transmission is included in the control signal so that the SV signal is sent to the corresponding outdoor device. Upon receiving this control signal, the outdoor device on the protection line side shuts off the output terminal so that unnecessary radio waves are not output from the antenna.

In the above first embodiment, the transmission / reception shared antenna is provided for each line, but instead of this, as shown in FIG. 5, in order to share the antenna between the lines, the first outdoor unit is used. The device 3 and the second outdoor device 6 are connected to the antenna duplexer 31.
The antenna duplexer 31 may be connected to one transmission / reception shared antenna 32. by this,
This device is effective when the number of antennas is reduced and the cost can be reduced, and when it is difficult to install two antennas or the antenna size is large.

Since the antenna duplexer 31 needs to have a loss as low as possible with respect to the RF signal, for example, a demultiplexer is used. In this case, for example, by configuring the first outdoor device 3 to output the H polarized wave and the second outdoor device 6 to output the V polarized wave, the transmission / reception shared antenna 32 can be shared between the lines. Since the demultiplexer is a passive circuit, it has high reliability,
In addition, it does not require external switch switching control, and is cheaper and more reliable than coaxial type or waveguide type switching switches. Therefore, it is suitable to be installed and used outdoors.

Next, a second embodiment of the present invention will be described. FIG. 6 is a block diagram of a second embodiment of the present invention corresponding to the second wireless communication device shown in FIG. In the figure, the same components as those shown in FIG. 1B are designated by the same reference numerals.

In the figure, the internal structure of the indoor unit (IDU) 13 is basically the same as the internal structure of the first indoor unit 1 of the first embodiment, and the first outdoor unit (ODU) 11 and The internal configuration of the second outdoor unit (ODU) 12 is the same as the internal configuration of the first outdoor unit 3 and the second outdoor unit 6 of the first embodiment. Descriptions of the same parts are omitted.

The monitoring control section 13e of the indoor unit 13 includes a switching control section which sends a switching signal to the changeover switch 16 to switch the switch. The switching control unit of the monitoring control unit 13e includes a first outdoor device 11 and a second outdoor device 12
The alarm signals included in the status information of the first outdoor device 11 and the second outdoor device 12 are received from each of the monitoring control units, and the changeover switch 16 is operated in accordance with these alarm signals and a predetermined predetermined switching logic. Manipulate.

The changeover switch 16 is the switch body 16
In addition to a, it includes a first combining / separating unit 16b, a second combining / separating unit 16c, and a third combining / separating unit 16d. The switch body 16a is a switch for switching the IF signal as described later. Since the frequency of the IF signal is usually 1 GHz or less, it is composed of a highly reliable and inexpensive semiconductor switch using a PIN diode or the like. The first synthesizing / separating unit 16b has a high-pass filter (hereinafter referred to as "HPF") at the upper part and a low-pass filter (hereinafter referred to as "LPF") at the lower part as shown in the figure. Similarly, in the second synthesis / separation unit 16c, the upper portion shown in the figure is the LPF and the lower portion is the HP.
F, the upper part of the third synthesis / separation unit 16d is HPF,
The lower part is the LPF. Each HPF has a circuit configuration as shown in the lower part of FIG. 7, and has the frequency characteristic shown by “HPF” in FIG. 3 to pass the IF signal. On the other hand, each LPF has a circuit configuration as shown in the upper part of FIG. 7, and has a frequency characteristic shown by “LPF” in FIG. 3 and passes a DC signal and an SV signal.

For example, when the first line is the working line, the switch body 16a is switched and connected to the position shown by the solid line in FIG. 6 under the control of the switching control unit in the monitoring control unit 13e of the indoor unit 13. ing. In this case, at the time of transmission, the combined signal of the IF signal, the SV signal, and the DC power supply signal is added to the first combining / separating unit 16b of the changeover switch 16, and only the IF signal is output by the HPF of the first combining / separating unit 16b. Is taken out and passed through the switch body 16a to the second
Is sent to the synthesizing / separating unit 16c. On the other hand, the first composition
The LPF of the separation unit 16b extracts the SV signal and the DC power supply signal and sends them to both the second combination / separation unit 16c and the third combination / separation unit 16d. The second synthesizer / separator 16c receives the sent IF signal, SV signal, and DC signal.
The power supply signal is combined and output to the first outdoor device 11 via the coaxial cable 14. On the other hand, the third synthesis / separation unit 1
6d outputs the sent SV signal and DC power supply signal to the second outdoor device 12 via the coaxial cable 15. That is, even on the protection line side, the DC power signal and S
The V signal is sent to the second outdoor unit 12 on the protection line side, which keeps the second outdoor unit 12 on the protection line side in hot standby, and the operating state is under supervision. . At the time of reception, the second synthesizing / separating unit 16c and the third synthesizing / separating unit 16d separate the IF signal and the SV signal, and only the IF signal is sent to the switch main body 16
a, and the first synthesis / separation unit 16b sends the IF signal and SV
Performs synthesis with the signal.

Here, the monitoring controller 13e of the indoor unit 13
When the switching control unit inside receives the alarm signal from the first outdoor device 11, the switching control unit issues a command to the switch body 16a of the changeover switch 16 to switch to the protection line, and the switch body 16a Is switched and connected to the position opposite to the position indicated by the solid line. Thereby, instead of the first outdoor unit 11, the second outdoor unit 12 operates in the same manner as above.

As described above, in the second embodiment, the cost is reduced by using only one indoor unit without duplicating it. This is because the indoor device has better environmental conditions than the outdoor device, and therefore has high reliability and good maintainability. Therefore, rather than duplicating the indoor device, priority is given to low cost. It is a thing.

In the second embodiment as well, although the IF signal is not input to the outdoor device on the protection line side, unnecessary radio waves such as noise are prevented from being output from the antenna from the outdoor device on the protection line side. In order to
However, an instruction to stop transmission is included as a control signal in the SV signal directed to the outdoor device on the protection line side, and the outdoor device on the protection line side that receives this SV signal shuts off the output end to eliminate unnecessary radio waves. Do not output from the antenna.

Also in the second embodiment, in order to share the antenna between the lines, the first outdoor unit 11 and the second outdoor unit 12 are connected to the antenna duplexer as in the configuration shown in FIG. The antenna duplexer may be connected to one transmission / reception antenna. In this case, a polarization demultiplexer is used as the antenna duplexer, and the first outdoor device 11 uses the H polarization,
The second outdoor unit 12 is configured to output V polarization.

Further, in the second embodiment, the indoor unit 13
However, the SV signal directed to the outdoor device on the protection line side includes a command to stop transmission as a control signal to prevent unnecessary radio waves from being sent from the protection line side. By adding the transmission stop device shown in FIG. 8 to the outdoor device, the SV signal of the transmission stop command may not be sent from the indoor device to the outdoor device on the protection line side to prevent the transmission of unnecessary radio waves.

FIG. 8 is a block diagram of a transmission stopping device to be added to such an outdoor device. This transmission stop device has a function of monitoring the input of an IF signal for transmission which is supposed to be sent from the indoor device, and blocking the transmission output from the output end of the outdoor device when there is no input of the IF signal. .

In the figure, the outdoor unit is an IF band AGC circuit 3
3, a frequency conversion circuit 34 between the IF signal and the RF signal,
It is composed of a high-power amplifier circuit 35 in the RF band and a band-pass filter 36 that suppresses unnecessary waves, while a transmission stop device is inserted between the high-power amplifier circuit 35 and the band-pass filter 36 for blocking. A switch 37 and a control circuit 38 for controlling the operation of the shutoff switch 37 to which the IF signal is input.
Consists of.

The control circuit 38 monitors the input level of the IF signal for transmission which should be sent from the indoor unit, and when the input level of the IF signal is lower than a predetermined value, the outdoor unit of its own is placed on the protection line side. When it is determined that there is, the cut-off switch 37 is turned off to cut off between the high-output amplifier circuit 35 and the bandpass filter 36. This prevents unnecessary waves from being sent from the protection line side. By providing this outdoor device with this transmission stop device, it becomes unnecessary to send the SV signal of the transmission stop command from the indoor device to the outdoor device on the protection line side, and the SV signal is one-way transmission of the status information from the outdoor device to the indoor device. You can just do it.

Next, a third embodiment of the present invention will be described. FIG. 9 is a block diagram of a third embodiment of the present invention corresponding to the third wireless communication device shown in FIG. 1 (C). In the figure, the same components as those shown in FIG. 1C are designated by the same reference numerals.

In the figure, the internal configuration of the indoor unit (IDU) 21 is the same as the internal configuration of the first indoor unit 1 of the first embodiment, and the first outdoor unit (ODU) 19 and the second outdoor unit (IDU) 21 are the same. The internal configuration of the outdoor unit (ODU) 20 is basically the same as the internal configuration of the first outdoor unit 3 and the second outdoor unit 6 of the first embodiment, and the internal configuration of the changeover switch 23 is
The internal configuration of the changeover switch 16 of the second embodiment is the same. Descriptions of the same parts are omitted.

In the figure, the monitoring control units 19a and 20a in the first outdoor unit 19 and the second outdoor unit 20 are alarm signals included in the status information of the first outdoor unit 19 and the second outdoor unit 20, respectively. To the control means 24, and the control means 2
Reference numeral 4 operates the switch main body 23a in the changeover switch 23 in accordance with these alarm signals and preset predetermined switching logic.

In the third embodiment, the changeover switch 23 for changing over the IF signal is provided on the outdoor side. As a result, the number of coaxial cables connecting the indoor side and the outdoor side is two in the first and second embodiments, but only one, which facilitates installation work. At the same time, the cost can be reduced.

Usually, the outdoor device is installed on the roof of a building or a steel tower, and the indoor device is installed in an indoor equipment room. As a result, the coaxial cable connecting the outdoor device and the indoor device is often several hundred meters. In such a case, reducing the number of coaxial cables from two to one greatly reduces the cost of laying the coaxial cable. Furthermore, it is often difficult to pass a plurality of coaxial cables through the laid pipe, and it is possible to handle such a case. Furthermore, since the loss in the cable is reduced when the cable length becomes long, it is unavoidable to use a low-loss coaxial cable even if it is expensive, and in such a case, it is possible to configure one coaxial cable. It greatly contributes to low cost.

In the third embodiment as well, although the IF signal is not input to the outdoor device on the protection line side, unnecessary radio waves such as noise are prevented from being output from the antenna from the outdoor device on the protection line side. In order to
However, an instruction to stop transmission is included as a control signal in the SV signal directed to the outdoor device on the protection line side, and the outdoor device on the protection line side that receives this SV signal shuts off the output end to eliminate unnecessary radio waves. Do not output from the antenna.

Also in the third embodiment, in order to share the antenna between the lines, the first outdoor unit 19 and the second outdoor unit 20 are connected to the antenna duplexer as in the configuration shown in FIG. The antenna duplexer may be connected to one transmission / reception antenna. In this case, a polarization demultiplexer is used as the antenna duplexer, and the first outdoor device 19 uses the H polarization,
The second outdoor device 20 is configured to output V polarization.

Furthermore, in the third embodiment as well, by adding a transmission stop device as shown in FIG. 8 to the outdoor device,
S of the transmission stop command from the indoor device to the outdoor device on the protection line side
It is also possible to prevent the transmission of unnecessary radio waves without transmitting the V signal.

In the third embodiment, if the first outdoor device 19 and the second outdoor device 20 are provided with input terminals for the DC power signal and the SV signal, respectively, the synthesizing / separating section 23c and The synthesizing / separating unit 23d becomes unnecessary. However, in this case, the first outdoor unit 19 and the second outdoor unit 20 require connectors and wiring.

[0073]

As described above, in the present invention, since the changeover switch for the RF signal for changing over the RF signal of the duplicated outdoor device is eliminated, the reliability is improved and the total cost is reduced.

Further, it has become possible to provide a low-cost device by adopting a structure in which the indoor device is not duplicated. Since the indoor device has good installation environment conditions, deterioration of reliability does not become a problem even if the duplication is eliminated.

Furthermore, the installation work is facilitated by providing a single coaxial cable connecting the indoor device and the outdoor device, and a low cost device is provided.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

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

FIG. 3 is a diagram showing frequency distributions of three signals.

FIG. 4 is a flowchart showing a procedure of switching command output performed by the control means.

FIG. 5 is a block diagram of an embodiment using an antenna duplexer.

FIG. 6 is a block diagram of a second embodiment of the present invention.

FIG. 7 is a circuit configuration diagram of a synthesis / separation unit.

FIG. 8 is a block diagram of a transmission stop device.

FIG. 9 is a block diagram of a third embodiment of the present invention.

FIG. 10 is a block diagram showing an example of a conventional wireless communication device including an outdoor device and an indoor device.

FIG. 11 is a block diagram showing an example of a conventional wireless communication device having a duplex configuration.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st indoor unit 2 Coaxial cable 3 1st outdoor unit 4 2nd indoor unit 5 Coaxial cable 6 2nd outdoor unit 7 Changeover switch 8 Control means 9 Transmission / reception shared antenna 10 Transmission / reception shared antenna 11 1st outdoor unit 12 2nd outdoor equipment 13 Indoor equipment 14 Coaxial cable 15 Coaxial cable 16 Changeover switch 17 Transmission / reception shared antenna 18 Transmission / reception shared antenna 19 1st outdoor equipment 20 2nd outdoor equipment 21 Indoor equipment 22 Coaxial cable 23 Changeover switch 24 Control means 25 common antenna for transmitting / receiving 26 common antenna for transmitting / receiving

Claims (7)

[Claims] 1. A wireless communication device having a duplicated structure for a working line and a protection line, the first indoor unit (1) for a first line including at least a modulation / demodulation section and a monitoring control section. A first outdoor device (3) for the first line, which is connected to the first indoor device (1) by a coaxial cable (2) and includes at least a frequency conversion unit and a monitoring control unit; Second indoor device (4) for the second line including a control unit and a monitoring control unit, and a coaxial cable (5) connected to the second indoor device (4), and at least a frequency conversion unit and a monitoring control unit. A second outdoor device (6) for a second line, including one side connected to the first indoor device (1) and the second indoor device (4), and the other side to a baseband signal Connected to the processing side, the baseband signal processing A change-over switch (7) for connecting the first indoor unit (1) or the second indoor unit (4) to the first indoor unit (1) and the second indoor unit (4). Status signals of the first indoor device (1) and the first outdoor device (3) that are connected to each other from the monitoring control units of the first indoor device (1) and the first outdoor device (3). Further, the state of the second indoor device (4) and the second outdoor device (6) is received from the monitoring control units of the second indoor device (4) and the second outdoor device (6). A wireless communication device comprising: a control means (8) which receives a signal and operates the changeover switch (7) based on each of these status signals. 2. A wireless communication device having a duplicated structure for a working line and a protection line, wherein the first outdoor device (11) for the first line includes at least a frequency conversion unit and a monitoring control unit. A second outdoor device (12) for the second line including at least a frequency conversion unit and a monitoring control unit; an indoor device (13) including at least a modulation / demodulation unit and a monitoring control unit; The indoor unit (13), the other side of which is connected to the first outdoor unit (11) and the second outdoor unit (12) via coaxial cables (14, 15), respectively. ) Is connected to the first outdoor device (11) or the second outdoor device (12), and a changeover switch (16) is included in the monitoring control section of the indoor device (13).
Outdoor device (11) and said second outdoor device (12)
Switching control means for receiving the status signals of the first outdoor device (11) and the second outdoor device (12) from each of the monitoring control units, and operating the changeover switch (16) based on these status signals. And a wireless communication device. 3. The indoor unit (13) includes means for supplying power to the first outdoor unit (11) or the second outdoor unit (12), and the first outdoor unit (11) or Means for transmitting / receiving a monitor control signal to / from the second outdoor device (12), means for transmitting / receiving an IF signal of a main signal, and these power supplies having different frequency bands, the monitor control signal, and the IF signal And a synthesizing means for synthesizing the same and sending it to the first outdoor device (11) or the second outdoor device (12), and the changeover switch (16)
Extracts only the IF signal based on the frequency difference from the transmitted combined signal and sets the indoor unit (13) to the first outdoor unit (11) or the second outdoor unit for the IF signal. (12) and connects the indoor unit (13) to the first outdoor unit (11) and the second outdoor unit (1) for the power supply and the monitor control signal.
The wireless communication device according to claim 2, further comprising means for always connecting to 2). 4. The first outdoor unit (11) and the second outdoor unit (12) detecting means for detecting whether or not an IF signal of a main signal is input from the indoor unit (13). 3. The wireless communication device according to claim 2, further comprising: a stop unit that stops the transmission from the outdoor device of its own when the detecting unit does not detect the input of the IF signal. 5. A wireless communication device having a duplicated structure for a working line and a protection line, the first outdoor device for a first line including at least a frequency conversion unit and a monitoring control unit (19). A second outdoor device (20) for the second line including at least a frequency conversion unit and a monitoring control unit; an indoor device (21) including at least a modulation / demodulation unit and a monitoring control unit; and a coaxial cable on one side (22) is connected to the indoor unit (21) and the other side is connected to the first outdoor unit (1).
9) and the second outdoor device (20) and connects the indoor device (21) to the first outdoor device (19) or the second outdoor device (20). And a monitor controller connected to the first outdoor device (19) and the second outdoor device (20), respectively, from the monitoring control units of the first outdoor device (19) and the second outdoor device (20). The first outdoor device (19) and the second outdoor device (2
Control means (2) for receiving the status signals of (0) and actuating the changeover switch (23) based on these status signals.
4) A wireless communication device comprising: 6. The indoor unit (21) means for supplying power to the first outdoor unit (19) or the second outdoor unit (20), and the first outdoor unit (19) or Means for transmitting / receiving a monitor control signal to / from the second outdoor device (20), means for transmitting / receiving an IF signal of a main signal, and a power source, a monitor control signal, and an IF signal having different frequency bands from each other. And a synthesizing means for synthesizing the same and sending it to the first outdoor device (19) or the second outdoor device (20), and the changeover switch (23)
Extracts only the IF signal from the transmitted combined signal based on the frequency difference and sets the indoor device (21) to the first outdoor device (19) or the second outdoor device for the IF signal. (20) to connect the indoor unit (21) to the first outdoor unit (19) and the second outdoor unit (2) for the power supply and the monitor control signal.
6. The wireless communication device according to claim 5, further comprising means for constantly connecting to 0). 7. The first outdoor unit (19) and the second outdoor unit (20) are detecting means for detecting whether or not an IF signal of a main signal is input from the indoor unit (21). 6. The wireless communication device according to claim 5, further comprising: and a stop unit that stops transmission from the outdoor device of its own when the detecting unit does not detect the input of the IF signal.