JPH11215074A - Repeating transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To repeat a service channel with high certainty by discriminating the propriety of an operation situation by means of a control information extraction means and a monitoring control means and giving a signal received by a reception means to a transmission means, in place of extracted transmission information when the result of discrimination is false. SOLUTION: A signal given through a transmission line is received by the reception means 11 of a repeating transmission device and is given to a transmission information extracting means 12 and a control information extracting means 13. A reception operation situation discrimination means 16 discriminates the propriety of an operation situation on one of or both control information extraction means 13 and the monitoring control means 14. When the result of the discrimination is false, a repeating mode switch means 17 gives the signal received by the reception means 11 to a transmission means 15 in place of transmission information extracted by the transmission information extraction means 12. The transmission means 15 transmits the repeating signal to the subsequent transmission period of the transmission line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-regenerative relay at a relay point of a transmission system, and, together with a regenerative relay of a service channel provided for monitoring and control, to a terminal station facing through the service channel. The present invention relates to a relay transmission device that performs processing related to maintenance and operation under the initiative.

[0002]

2. Description of the Related Art In recent years, with respect to telephone, data transmission and other communication services, the market has been liberalized and competition among a plurality of telecommunications companies has been made to reduce costs and improve service quality. Therefore, for the trunk transmission line provided for such communication services, labor saving of maintenance, reduction of power consumption, improvement of mounting efficiency in the relay station building, and improvement of reliability are achieved. Many advantageous non-regenerative relay systems are being applied in place of the regenerative relay system.

FIG. 7 is a diagram showing a configuration example of a transmission system to which a non-regenerative relay system is applied. In the figure, the terminal device 90
-M indicates that the relay transmission devices 92-1 to 92-N installed at the plurality of relay points of the wireless transmission
Face each other. The terminal device 90-M includes a main modulator 93-M that modulates a predetermined carrier signal according to transmission information to be transmitted as a communication service, and the above-described relay transmission devices 92-1 to 92-N. A main monitoring control unit 94-M for initiatively performing monitoring control of the SC, an SC modulator 95-M cascade-connected to the main monitoring control unit 94-M, and a main modulator 93-M and SC modulation The output of the transmitter 95-M is connected to the corresponding modulation input, and the transmitter 95-M is disposed at one end of the radio transmission line 91 and connected to the feeding end of the antenna 96-M.

[0004] The relay transmission device 92-1 includes an antenna 98-1 opposed to the above-described antenna 96-M via the radio transmission line 91, and a feed end of the antenna 98-1 and a portion following the radio transmission line 91. Antenna 9 arranged at one end of the transmission section
A receiving unit 100-1, which is cascade-connected between the power supply end of the 9-1 and the feeding terminal of the 9-1;
SC demodulator 10 cascaded between band rejection filter 101-1 and transmitting section 102-1 and a demodulated output of receiving section 100-1 and a specific modulation input of transmitting section 102-1.
3-1, a monitoring control unit 104-1 and an SC modulator 105-1.

[0005] The configuration of the relay transmission devices 92-2 to 92-N is the same as that of the relay transmission device 92-1.
The same reference numeral as "N" is given, and illustration and description are omitted here. In the conventional example having such a configuration, the main modulator 93-M provided in the terminal station device 90-M generates a main signal by modulating a predetermined carrier signal according to the above-described transmission information. .

In the following, for the sake of simplicity, such a main signal is adapted, for example, to a multi-carrier transmission system and three carrier signals arranged at intervals of 20 MHz are arranged at a speed of 156 Mbit / sec. It is assumed that the signal is generated by performing 16QAM modulation in parallel according to given transmission information. In addition, the main monitoring control unit 94-M
Is a relay transmission device 92 for realizing the monitoring control described above.
-1 to 92-N (here, for the sake of simplicity, from the communication signal for a meeting (32 kbit / s) and the data related to monitoring and control (32 kbit / s)) Is output as a baseband signal of a predetermined type.

Further, the SC modulator 95-M generates a carrier signal having a frequency that does not belong to the above-mentioned main signal occupied band (hereinafter, referred to as "main signal band") (hereinafter, "SC carrier signal").
That. ) According to this baseband signal (for the sake of simplicity, it is assumed that a four-phase PSK modulation method is applied), so that an occupied band different from the main signal band (hereinafter referred to as “SC signal band”). S)
Generate a C signal.

The transmitting section 97-M generates a transmission wave signal by combining the main signal and the SC signal, and transmits the transmission wave signal to the radio transmission line 91 via the antenna 96-M.

On the other hand, in the relay transmission device 92-1, the receiving unit 1
00-1 receives the received wave arriving at the antenna 98-1 via the wireless transmission path 91, and sets the band rejection filter 101-1 and S
C demodulator 103-1. Band stop filter 101
-1 prevents the SC signal component contained in the received wave by performing the filtering process adapted to the difference between the above-described main signal band and the SC signal band in the frequency domain. In order to distinguish a signal composed of this component from the above-mentioned main signal, a “relay main signal” is extracted and supplied to the transmitting section 102-1.

[0010] The SC demodulator 103-1 restores the above-described control information by extracting and demodulating the components of the SC signal contained in the received wave. Monitoring control unit 10
4-1 determines whether or not any processing relating to supervisory control should be performed in its own station by analyzing the control information based on the above-described model. If the result of the determination is true, A process corresponding to the control information is performed. Further, the monitoring control unit 104-1 relays any of the items included in such control information to any of the relay transmission devices 92-2 to 92-N via the subsequent transmission section of the wireless transmission path 91. Items to be performed, and information generated in the course of the above-described processing, and these relay transmission devices 92-2 to 92-N
To generate control information of a predetermined type by combining the information to be transmitted with the control information.

The SC modulator 105-1 modulates the SC carrier signal whose nominal frequency is the same as the frequency of the above-mentioned SC carrier signal according to the control information, so that the occupied band is the same as the SC signal band described above. The same SC signal (hereinafter, in order to distinguish from the SC signal generated by the SC modulator 95-M provided in the terminal device 90-M,
It is called “relay SC signal”. ).

As shown in FIG. 8 (a), the transmitting section 102-1 combines the above-mentioned relay main signal and relay SC signal to form a transmission wave signal (hereinafter, provided in the terminal device 90-M). In order to distinguish the transmission signal from the transmission signal generated by the transmission unit 97-M, it is referred to as a “relay transmission signal”.)
, And transmits the relay transmission signal to the subsequent transmission section of the wireless transmission path 91 via the antenna 99-1.

Further, in the relay transmission devices 92-2 to 92-N, the above-described processing performed in the relay transmission device 92-1 is similarly repeated. That is, the relay transmission device 92-1
, The main signals are (receiving unit 100-1, band rejection filter 101-1 and transmitting unit 102-1) to (receiving unit 100-N, band rejection filter 101-N and transmitting unit 102-N, respectively).
N), the control information related to the supervisory control includes (reception unit 100-1, SC demodulator 1)
03-1, monitoring control section 104-1, SC modulator 105-1, transmitting section 102-1) to (receiving section 100-N, SC demodulator 103)
-N, the monitoring control unit 104-N, the SC modulator 105-N, and the transmission unit 102-N).

[0014] Hereinafter, a channel formed under such regenerative relay is referred to as a "service channel".
Therefore, the main monitoring control unit 94-M provided in the terminal station device 90-M is connected to the relay transmission device 92-1 via the wireless transmission path 91.
To 92-N, a command relating to monitoring control and a parameter associated with the command are given, and the monitoring control units 104-1 to 10-N provided in these relay transmission devices 92-1 to 92-N are provided.
By coordinating with 104-N, the monitoring control can be performed in a leading manner.

[0015]

By the way, in the above-mentioned conventional example, for example, in the relay transmission device 92-1, the SC
If a failure occurs in any of the demodulator 103-1, the monitoring controller 104-1 and the SC modulator 105-1, the receiver 1
Since the component of the SC signal included in the received wave received by 00-1 is rejected by the band rejection filter 101-1 and is not complemented at all, as shown in FIG. It is not relayed in the transmission section where it is performed.

Therefore, the relay transmission devices 92-2 to 92-N
With regard to, maintenance and operation are often hindered because control information necessary for realizing the monitoring control is not provided from the main monitoring control unit 94-M which should take the initiative in monitoring control. The present invention is directed to a relay transmission system for accurately relaying a service channel between a terminal device and an opposite relay transmission device via a subsequent transmission section without significantly changing the basic hardware configuration. It is intended to provide a device.

[0017]

FIG. 1 is a block diagram showing the configuration of a first embodiment of the present invention;
It is a principle block diagram of the invention described in FIG. According to the first aspect of the present invention, there is provided a receiving unit which receives a signal generated by multiplexing control information related to monitoring control and transmission information to be subjected to a communication service, and which is provided through a transmission path. A transmission information extracting unit 12 for extracting transmission information from a signal received by the receiving unit 11, a control information extracting unit 13 for extracting control information from a signal received by the receiving unit 11, and a control information extracting unit 13. The monitoring control means 14 performs monitoring control processing adapted to the extracted control information, and extracts control information to be relayed to a subsequent transmission section of the transmission line from the control information.
Multiplexing the transmission information extracted by the transmission information extracting means 12 and the control information extracted by the monitoring control means 14 to generate a relay signal, and transmitting the relay signal to a subsequent transmission section of the transmission path. In the relay transmission device provided with the means 15, the operating status determining means 16 for determining whether or not the operating status of the control information extracting means 13 and / or the monitoring control means 14 is correct, and the operating status determining means 16 A relay mode switching unit for providing a signal received by the receiving unit to the transmitting unit instead of the transmission information extracted by the transmission information extracting unit when the result of the determination is false; It is characterized by having.

FIG. 2 is a block diagram showing the principle of the present invention. According to a second aspect of the present invention, the control information related to the supervisory control and the transmission information targeted for the communication service are based on one of the frequency division multiplexing system and the wavelength division multiplexing system. Receiving means 21 for receiving a signal generated by being multiplexed and given through a transmission path, and transmitting information by blocking control information components out of signal components received by the receiving means 21 Transmission information extracting means 22 for extracting
Control information extracting means 23 for extracting control information from a signal received by the receiving means 21;
Monitoring control means 24 for performing a monitoring control process adapted to the control information extracted by the above, and extracting, from the control information, control information to be relayed to a subsequent transmission section of the transmission path.
The transmission information extracted by the transmission information extraction means 22 and the control information extracted by the monitoring control means 24 are multiplexed based on one multiplexing method to generate a relay signal, and the relay signal is transmitted to the transmission line. Operating status determining means for determining whether or not the operating status of at least one of the control information extracting means 23 and the monitoring control means 24 is provided in the relay transmission device having the transmitting means 25 for transmitting to the subsequent transmission section. 26, when the result of the determination made by the operation status determination means 26 is false, the transmission information extraction means 22 blocks as a component of control information other than the area where the signal received by the reception means 21 is distributed. And a relay mode switching means 27 for setting an area to be set.

According to a third aspect of the present invention, in the relay transmission device according to the first or second aspect, when the result of the determination made by the operation status determining means 16 or 26 is false, the monitoring control is performed. A regenerative relay blocking means 31 for invalidating control information extracted by the means 14 and 24 and given to the transmitting means 15 and 25 is provided. According to a fourth aspect of the present invention, there is provided the relay transmission apparatus according to the first or second aspect, wherein the operation status determination means and
When the result of the determination made by the control means is false, the control information extracting means 23 extracts control information from the signals received by the receiving means 11 and 21;
4, 24 is provided with a regenerative relay blocking means 41 for regulating both or one of the control information and a process of extracting control information to be relayed to a subsequent transmission section of the transmission path. I do.

In the relay transmission apparatus according to the first aspect of the present invention, the receiving means 11 is generated by multiplexing control information related to monitoring control and transmission information to be subjected to a communication service, and Receive the signal given through the. The transmission information extracting means 12 extracts transmission information from the signal and outputs the control information extracting means 13
Extracts the control information described above from the signal thus received. The monitoring control means 14 performs a monitoring control process adapted to the control information, and among the control information,
The control information to be relayed to the subsequent transmission section of the transmission path is extracted.

The transmitting means 15 multiplexes the control information and the transmission information extracted by the transmission information extracting means 12 to generate a relay signal, and transmits the relay signal to a subsequent transmission section of the transmission path. However, the operating status determining unit 16 determines whether or not the operating status of the control information extracting unit 13 and / or the monitoring control unit 14 is correct.
Further, when the result of this determination is false, the relay mode switching means 17
The signal received by the receiving unit 11 is given to the transmitting unit 15 instead of the transmission information extracted by the transmitting unit 15.

That is, when a failure occurs in the control information extracting means 13 and the monitoring control means 14 for realizing the reproduction relay of the control information, the transmission section following the transmission path is replaced by the transmission section preceding the transmission path. Since the received control information is non-regeneratively relayed together with the transmission information, the operation status determining means 16
The relay transmission of the control information is performed with higher accuracy than the conventional example in which the relay mode switching means 17 is not provided.

In the relay transmission apparatus according to the second aspect of the present invention, the receiving means 21 transmits the control information relating to the monitoring control and the transmission information to be subjected to the communication service to the frequency division multiplexing method and the wavelength division multiplexing method. And a signal generated by multiplexing based on one of the multiplexing methods and given through a transmission path. Further, the transmission information extracting means 22 extracts the transmission information by blocking the control information component based on the above-described one-way multiplexing method among the signal components, and the control information extracting means 23 outputs the same signal. Extract control information from components.

The monitoring control means 24 performs a monitoring control process adapted to the control information extracted in this way, and includes a control to be relayed to a subsequent transmission section of the transmission line, out of the control information. Extract information. Transmission means 25
Generates a relay signal by multiplexing the transmission information and the control information extracted by the supervisory control means 24 based on one of the above-described multiplexing methods, and transfers the relay signal to a subsequent transmission section of the transmission path. Send.

However, the operating status determining means 26 determines whether or not the operating status of the control information extracting means 23 and / or the monitoring control means 24 is correct, and the relay mode switching means 27 determines the result of the determination. Is false, the transmission information extraction unit 22 sets the region to be blocked as a component of the control information to a region other than the region in which the signal received by the reception unit 21 is distributed. If any failure occurs in the information extracting means 23 or the monitoring control means 24, the control information received from the preceding transmission section of the transmission path is non-reproducibly relayed together with the transmission information in the subsequent transmission section of the transmission path. Therefore, the operating status determining means 26 and the relay mode switching means 2
The relay transmission of the control information is performed with higher accuracy than the conventional example in which the control information 7 is not provided.

According to a third aspect of the present invention, in the relay transmission apparatus according to the first or second aspect, the reproduction relay prevention means 31 is performed by the operation state determination means 16 and 26. When the result of the determination is false, the control information extracted by the monitoring control means 14 and 24 and given to the transmission means 15 and 25 is invalidated.

That is, during a period in which a fault has occurred in the control information extracting means 13 and 23 and the monitoring control means 14 and 24, the control information is supplied through the control information extracting means 13 and 23 and the monitoring control means 14 and 24. Control information that is not guaranteed in terms of content and type is not transmitted to the subsequent transmission section of the transmission path, so that control can be performed while flexibly adapting to the applied hardware configuration and transmission method. Relay transmission of information is performed with high accuracy.

In the relay transmission apparatus according to the fourth aspect of the present invention, in the relay transmission apparatus according to the first or second aspect, the regenerative relay prevention means 41 is performed by the operation status determination means 16 and 26. When the result of the determination is false, the control information extracting means 13 and 23 extract control information from the signals received by the receiving means 11 and 21, and the monitoring control means 14 and 24 execute And / or a process for extracting control information to be relayed to a subsequent transmission section of the transmission path.

That is, during the period in which the control information extracting means 13 and 23 and the monitoring control means 14 and 24 have a fault, the information is given by the monitoring control means 14 and 24 and the correctness of the contents and model is guaranteed. Since the control information that is not transmitted is prevented from being transmitted to the subsequent transmission section of the transmission path, the relay transmission of the control information is performed with high accuracy while flexibly adapting to the applied hardware configuration and transmission method.

[0030]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG.
FIG. 3 is a diagram showing a first embodiment corresponding to the invention described in FIG. In the figure, components having the same functions and configurations as those shown in FIG. 7 are denoted by the same reference numerals, and description thereof is omitted here.

This embodiment and the relay transmission device 92 shown in FIG.
The difference between the configuration of the SC modulator 105 and the output of the SC demodulator 103-1 and the output of the supervisory control unit 104-1 and the supervisory output of the supervisory control unit 104-1. The output of the receiving unit 101-1 is connected to a common contact of a switch 51-1a in place of the input of the band rejection filter 101-1.
-1a is connected to the make contact of the switch 51-1b via the band reject filter 101-1. The break contacts of these switches 51-1a and 51-1b are directly connected, and the make contact of the band reject filter 101-1 is connected. This switch 5 replaces the output
1-1b is connected to the corresponding modulation input of the transmitting unit 102-1 and the output of the SC modulator 105-1 is connected to the switch 52-1.
-1, the make contact of the switch 52-1 is connected to a specific modulation input of the transmission unit 102-1 and the break contact of the switch 52-1 is grounded via the resistor 53-1. These switches 51-1a, 51-1b, 52
-1 is connected to the output of the monitoring unit 50-1.

The monitoring unit 50-1 is provided with the SC demodulator 103
Integrator 61-1 and discriminator 6 cascaded to the output of -1
2-1; an integrator 63-1 and a discriminator 64-1 cascaded to the output of the monitor controller 104-1; the output of the discriminator 64-1 and the monitor output of the monitor controller 104-1 , A detector 66-1 and a discriminator 67-1 cascaded to the output of the SC modulator 105-1, and a discriminator 6
Outputs of 2-1 and 67-1 and OR gate and switch 51-1
a, 51-1b, and an OR gate 68-1 disposed between the control inputs of 52-1.

In all the embodiments described in the present application, the terminal device 90-M in FIG. 7 is opposed via the radio transmission line 91 in the same manner as in the conventional example. Therefore, illustration and description are omitted. Note that the correspondence between the present embodiment and the block diagrams shown in FIGS.
0-1 corresponds to the receiving means 11 and 21; the band rejection filter 101-1 corresponds to the transmission information extracting means 12 and 22;
The demodulator 103-1 corresponds to the control information extracting units 13 and 23, the monitoring control unit 104-1 corresponds to the monitoring control units 14 and 24, and the transmitting unit 102-1 and the antenna 99-1 are transmitting units 15 and 25. , The monitoring unit 50-1 corresponds to the operation status determining means 16 and 26, the switches 51-1a and 51-1b correspond to the relay mode switching means 17, and the switch 52-1 and the resistor 53-1 correspond to Corresponds to the reproduction relay blocking means 31.

The operation of this embodiment will be described below. SC
The control information restored by the demodulator 103-1 is provided as a serial signal of a predetermined type. For simplicity, it is assumed that such control information is steadily encoded by the terminal device 90-M into a continuous zero suppression code such as B3ZS or HDB3 and transmitted.

Therefore, the control information output from the monitoring control section 104-1 according to such control information is given as a similar type of serial signal, and the output of the SC modulator 105-1 is added to the serial signal. A relay S which is constantly modulated accordingly
A C signal is obtained. In the monitoring unit 50-1, the integrator 61-1
Calculates the level of the serial signal by integrating the serial signal indicating the control information restored by the SC demodulator 103-1. As shown by the dotted line in FIG. 4 (a), the discriminator 62 applies two thresholds corresponding to the upper limit and the lower limit of the possible value of this level to the contents and model of the control information described above and the threshold. Whether or not the level which is set in advance as a value adapted to the transmission channel coding method and which is actually obtained by the integrator 61-1 has a value in a range between these thresholds (SC demodulator 103- (1) whether or not a signal of a prescribed level is obtained at the output (1).

The integrator 63-1 and the discriminator 64-1
Is associated with control information generated by the monitoring control unit 104-1 in the same manner as in the conventional example and given as a serial signal of the type described above in the same manner as the integration unit 61-1 and the discriminator 62-1. Is determined. Further, the detector 66-1 generates a demodulated signal by demodulating the relay SC signal generated by the SC modulator 105-1,
The discriminator 67-1 determines whether or not the demodulated signal is normal based on at least one of the amplitude and the phase in the signal space. For such a determination, for simplicity, the modulation according to the above-mentioned control information is performed steadily. Therefore, as shown by the dotted line in FIG. It is assumed that the determination is made based on the fact that the level is lower than the level and the level is higher than the level in a state where there is no carrier.

The monitoring control unit 104-1 has an alarm contact which is set to be open only during a period in which drive power is normally driven for each unit of the relay transmission device including the monitoring control unit 104-1. (For example, an NFB or an alarm fuse is applied, but is not shown here.), And the binary information indicating the state of the alarm contact is OR gated via the above-described monitoring output. 65-1.

The OR gates 65-1 and 68-1 have their alarm contacts opened and, as described above, the discriminators 62-1 and 6-1.
Switches 51-1a, 51-1b, and 51-1 are in a normal operating state in which all the results of the determinations made by 5-1 and 67-1 are true.
These switches 51-1a, 51-1b, and 52-1 are set so that all of the common contacts of 52-1 are connected to the break contacts.

Therefore, in such a normal operation state, the band rejection filter 101-1 switches between the output of the receiving unit 100-1 and the switch 51-1a, 51-1 between the stage of the transmitting unit 102-1.
b, 52-1 and SC modulator 105-1
Is connected to a specific modulation input of the transmitting unit 102-1 via the switch 52-1. Therefore, the reproduction relay of the control information and the non-regenerative relay of the main signal can be performed under the same configuration as the conventional example. It is done in parallel.

However, the above-mentioned alarm contact is set to be closed,
Alternatively, in a state where some or all of the determination results performed by the discriminators 62-1, 65-1, 67-1 are false, the OR gates 65-1, 68 are connected to the switches 51-1a, 51-1b,
The state of these switches 51-1a, 51-1b, and 52-1 is set such that all the common contacts of 52-1 are connected to the make contact.

Therefore, the output of SC modulator 105-1 is terminated via switch 52-1 and resistor 53-1.
The output of the receiving unit 100-1 is provided by switches 51-1a and 51-1b.
Is directly connected to the modulation input of the transmission unit 102-1 via the bypass circuit of the band rejection filter 101-1 formed by the above.

As described above, according to the present embodiment, the SC demodulator 103-1, the supervisory controller 104-1 and the SC modulator 103-1
5-1 has failed or these SCs have failed.
Demodulator 103-1, supervisory controller 104-1, SC modulator 10
In the state where some trouble occurs in the supply of the driving power to the relay transmission device including 5-1, the non-regenerative relay of the control information is opposed via the wireless transmission path 91 without the non-regenerative relay of the main signal being hindered. The transmission is performed between the terminal station device 90-M and another relay transmission device that is opposed to the terminal device 90-M via the subsequent transmission section of the wireless transmission path 91.

Therefore, the terminal station device 90-M provides highly accurate desired control information to all the normally operating relay transmission devices among the relay transmission devices installed at the relay points of the wireless transmission path 91. Monitoring and control can be performed. In the present embodiment, no difference in gain between the band rejection filter 101-1 and the detour that replaces the band rejection filter 101-1 is compensated for.
An amplifier or the like that realizes the compensation may be provided in both or any one of 1-1b.

In the present embodiment, the above-described detour is formed instead of the band rejection filter 101-1.
For such a bypass, this band rejection filter 1
If the impedance mismatch depending on the input impedance and the output impedance of the band rejection filter 01-1 is negligible or can be avoided by separately added hardware, the input / output of the band rejection filter 101-1 It may be formed in parallel between the terminals.

FIG. 5 is a diagram showing a second embodiment according to the first and third aspects of the present invention. In the figure, FIG.
The same reference numerals are given to those having the same functions and configurations as those shown in FIG. 1 and description thereof is omitted here.
The difference between this embodiment and the embodiment shown in FIG.
A hybrid (H) 71-1 is provided in place of the switch 51-1a, and a switch 72 is provided in place of the switch 51-1b.
At the point where -1 is provided.

The correspondence between the present embodiment and the block diagrams shown in FIGS. 1 and 2 is such that the monitoring unit 50-1, the hydride 71-1 and the switch 72-1 correspond to the relay mode switching means 17. Except for this, the correspondence is the same as in the embodiment shown in FIG. Hereinafter, the operation of the present embodiment will be described.

The hybrid 71-1 applies the received wave obtained by the receiving unit 100-1 to the input of the band rejection filter 101-1 and the make contact of the switch 72-1 at the same level. The switch 72-1 has a built-in terminator (shown in the figure) during a period in which the common contact connected to the modulation input of the transmission unit 102-1 is connected to the break contact (the output of the band rejection filter 101-1). The contact is not grounded.

However, during the period in which the above-mentioned common contact is connected to the make contact, the switch 72-1 replaces the reception wave given from the reception unit 100-1 via the hybrid 71-1 with this terminator. It is directly given to the modulation input of the transmission section 102-1. As described above, according to the present embodiment, the receiving unit 100-1
Between the transmission unit 102-1 and the detour formed by the switches 51-1a and 51-1b, as long as the insertion loss of the hybrid 71-1 is compensated or as small as possible. Since an equivalent circuit is configured, the number of blocks for realizing the switching of the circuit in the radio frequency domain as in the switch 51-1a is reduced, and the relay transmission device is switched in the same manner as the embodiment shown in FIG. Monitoring control is performed with high accuracy.

FIG. 6 is a diagram showing an embodiment corresponding to the second and fourth aspects of the present invention. In the drawing, components having the same functions and configurations as those shown in FIG. 3 are denoted by the same reference numerals, and description thereof is omitted here. The difference between the present embodiment and the embodiment shown in FIG. 3 is that the switches 51-1a and 51-1b and the band rejection filter 101-1 are different.
In that a variable band rejection filter 81-1 is provided instead.

The variable band rejection filter 81-1 has:
A parallel resonance circuit 83-1 arranged in series between the input terminal and the output terminal, and a series resonance circuit 84 terminating the output terminal.
And the variable capacitance diode 83a-1 forming the parallel resonance circuit 83-1 and the variable capacitance diode 84a-1 forming the series resonance circuit 84-1.
And an interface circuit 85-1 for applying a bias voltage according to the binary signal given from the interface circuit 85-1.

Note that the correspondence between the present embodiment and the block diagrams shown in FIGS. 1 and 2 is such that the variable band rejection filter 81-1 corresponds to the transmission information extracting unit 22, and the monitoring control unit 104-1 Switch 52-1 is monitoring control means 2
4, except that the variable capacitance diodes 83a-1 and 84a-1 and the interface circuit 85-1 correspond to the relay mode switching means 27. is there.

Hereinafter, the operation of this embodiment will be described. In the OR gates 65-1 and 68, the above-mentioned alarm contact is set to open,
When all of the results of the determinations made by the discriminators 62-1, 65-1, and 67-1 are true, the common contact of the switch 52-1 is connected to the transmission unit 102-1 and the interface circuit is connected. 85-1 through the variable capacitance diodes 83a-1, 8
A bias voltage is applied to 4a-1 such that the resonance frequency of the parallel resonance circuit 83-1 and the resonance frequency of the series resonance circuit 84-1 both match the frequency of the SC carrier signal.

For simplicity, it is assumed that the bandwidth of these parallel resonance circuit 83-1 and series resonance circuit 84-1 is equal to the bandwidth of the SC signal band described above. Therefore, in such a normal operation state, the variable band rejection filter 81-1 has a transfer characteristic equivalent to the band rejection filter 101-1 shown in FIG. Since the information is supplied to the input of the SC modulator 105-1 via the switch 52-1, the reproduction relay of the control information and the non-regeneration relay of the main signal are performed in parallel under the same configuration as in the conventional example. .

However, the above-mentioned alarm contact is set to be closed,
Alternatively, in a state where some or all of the results of the determinations made by the discriminators 62-1, 65-1, 67-1 are false, the OR gates 65-1, 68 connect the common contact of the switch 52-1 with a resistor. 53, and the resonance frequencies of the parallel resonance circuit 83-1 and the series resonance circuit 84-1 are connected to the variable capacitance diodes 83a-1 and 84a-1 via the interface circuit 85-1. A bias voltage having a value not belonging to the band and the SC signal band is applied.

Therefore, no relay SC signal is given to the specific modulation input of the transmission section 102 from the output of the SC modulator 105-1 without changing the output impedance of the SC modulator 105-1, and The stop band of the variable band stop filter 81-1 is set to a band other than the main signal band and the SC signal band described above. As described above, according to the present embodiment, the SC demodulator 103-1 and the monitoring control unit 104-1
A failure occurs in any one of the SC modulators 105-1, or the SC demodulator 103-1, the monitoring control unit 104-1,
In a state where some trouble occurs in the supply of the driving power to the relay transmission device including the SC modulator 105-1, the transmission section following the radio transmission line 91 is transmitted from the terminal device 90-M which is opposed via the radio transmission line 91. The control information to be transmitted to another relay transmission device that is opposed to the relay transmission device is non-regeneratively relayed together with the main signal.

Further, in the present embodiment, the blocking of switching the signal path in the radio frequency domain is not applied as in the switches 51-1a, 51-1b and 72-1 shown in FIGS. Since the above-described stop zone is electronically switched, high-density mounting becomes possible and reliability is improved as compared with the embodiment shown in these figures. In the present embodiment,
The rejection band of the variable band rejection filter 81-1 is varied according to the capacitance of the variable capacitance diodes 83a-1 and 84a-1.
Any configuration of the filtering circuit may be applied as long as the blocking band is set to a desired value by changing or switching the inductance, resistance, and other electrical characteristics of the components.

In each of the above embodiments, the terminal station 90
Although only the relay of control information to be transmitted from -M to the desired relay transmission device has been described above, for example, even when a full-duplex channel is to be formed as the service channel described above, By forming similar circuits individually corresponding to the upstream and downstream transmission lines, or by sharing the monitoring unit 50-1, the present invention is similarly applicable.

Further, in each of the above-described embodiments, the monitoring unit 50-1 operates the SC demodulator 103-1, the monitoring control unit 104-1 and the SC demodulator 105-1 normally based on the above-mentioned criterion. The items to be used as such criteria and the hardware and software configurations to be used for the determination of the items are determined by the modulation and demodulation method to be applied to the service channel. Any type can be used as long as it can be adapted to the type of control information to be transmitted via the service channel and can be determined with desired accuracy.

In each of the above-described embodiments, the 16QAM modulation method is applied to the transmission of the main signal. However, if the modulation method allows multiplexing with the service channel in the frequency domain, any signal arrangement may be used. May be applied. Further, in each of the above-described embodiments, only the relay transmission device installed at the relay point of the wireless transmission path is described, but the above-described service channel is reliably formed together with the channel used for transmitting the main signal. Then, the present invention is, for example,
The present invention can be similarly applied to a transmission system to which a baseband transmission system is applied or an optical transmission system to which a wavelength division multiplex transmission system is applied.

When the present invention is applied to a transmission system to which such a baseband transmission system is applied, a demultiplexing process and a multiplexing process adapted to the applied multiplex transmission system are respectively performed. The means for performing is the SC demodulator 103-1 and S
It may be provided instead of the C modulator 105-1.

Further, in each of the above-described embodiments, the monitoring and control of the relay transmission devices individually installed at the relay points of the wireless transmission line 91 are performed based on the polling method under the initiative of the terminal device 90-M. However, the present invention is not limited to such a polling method, and the present invention relates to, for example, a case where these relay transmission devices acquire a transmission right based on a predetermined communication procedure and perform transmission based on a contention method. The same can be applied to.

Further, in each of the above-described embodiments, no specific element constituting the switches 51-1a, 51-1b, 52-1 and 72-1 is shown, but the main signal band and the As long as desired isolation and responsiveness can be obtained in the SC signal band, not only semiconductors but also electromagnetic components such as relays may be applied. Furthermore, in each of the above-described embodiments, the control information to be transmitted in the subsequent transmission section of the wireless transmission path 91 includes the control information generated by the monitoring control unit 104-1. If there is no control information to be performed, the wireless transmission path 9
All or part of the control information received from one preceding transmission section may be simply relayed.

In each of the above embodiments, the transmitting unit 1
02-1 is terminated by the switch 52-1 and the resistor 53-1 or the monitor control unit 104-1
The switch 52-1 prevents the control information generated by the control unit from being supplied to the SC modulator 105-1. This restricts the reproduction and relay of the control information that was performed during the normal operation of each unit. However, such regulation of regenerative relay is performed, for example, between the stage between the receiving unit 100-1 and the SC demodulator 103-1 and the output of the SC demodulator 103-1 and the monitoring control unit 104-1. Either the configuration in which the coupling between and / or between the stages is prevented, or the configuration in which the demodulation processing to be performed by the SC demodulator 103-1 is restricted may be applied.

[0064]

As described above, according to the first and second aspects of the present invention, relay transmission of control information is performed with higher accuracy than in the conventional example. According to the third and fourth aspects of the present invention, the relay transmission of control information is performed with high accuracy while flexibly adapting to the applied hardware configuration and transmission system.

That is, in the transmission system to which these inventions are applied, the control information related to the monitoring control is highly accurate even during the period in which any of the relay transmission devices installed at the relay points have a failure. As a result, the possibility that the maintenance and operation of the relay transmission device other than the relay transmission device is hindered is greatly reduced, the service quality is maintained high, and the running cost is reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the principle of the present invention.

FIG. 2 is a principle block diagram of the invention according to claims 2 to 4;

FIG. 3 is a diagram showing a first embodiment corresponding to the first and third aspects of the present invention.

FIG. 4 is a diagram illustrating an operation of a monitoring unit according to the embodiment.

FIG. 5 is a diagram showing a second embodiment corresponding to the first and third aspects of the present invention.

FIG. 6 is a diagram showing an embodiment corresponding to the second and fourth aspects of the present invention.

FIG. 7 is a diagram illustrating a configuration example of a transmission system to which a non-regenerative relay system is applied.

FIG. 8 is a diagram illustrating an operation of a relay transmission device in a conventional example.

[Explanation of symbols]

 11, 21 receiving means 12, 22, transmission information extracting means 13, 23 control information extracting means 14, 24 monitoring and controlling means 15, 25 transmitting means 16, 26 operating status determining means 17, 27 relay mode switching means 31, 41 reproduction relay prevention Means 50 Monitoring unit 51, 52, 72 Switch 53 Resistor 61, 63 Integrator 62, 64, 67 Classifier 65, 68 OR gate 66 Detector 71 Hybrid (H) 81 Variable band rejection filter 83 Parallel resonance circuit 83a, 84a Variable Capacitance diode 84 Series resonance circuit 85 Interface circuit 90 Terminal device 91 Radio transmission line 92 Relay transmission device 93 Main modulator 94 Main monitoring and control unit 95, 105 SC modulator 96, 98, 99 Antenna 97, 102 Transmitter 100 Receiver 101 band rejection filter 103 SC demodulator 1 04 Monitoring control unit

Claims (4)

[Claims] 1. Receiving means for receiving a signal generated by multiplexing control information related to supervisory control and transmission information to be subjected to a communication service and provided through a transmission path, and the receiving means Transmission information extracting means for extracting the transmission information from the signal received by the control information, control information extracting means for extracting the control information from the signal received by the receiving means, and control information extracted by the control information extracting means Monitoring control means for performing monitoring control processing adapted to the above, and extracting control information to be relayed to a subsequent transmission section of the transmission line from among the control information; and transmission information extracted by the transmission information extraction means. And multiplexing the control information extracted by the monitoring control means to generate a relay signal. The relay signal is transmitted to a subsequent transmission section of the transmission path. A relay transmission device comprising: a transmission unit for transmitting; an operation status determination unit configured to determine whether the control information extraction unit and / or the monitoring control unit is correct or not; and an operation status determination unit. Relay mode switching means for providing a signal received by the receiving means to the transmitting means in place of the transmission information extracted by the transmission information extracting means when a result of the determination made by the user is false. A relay transmission device. 2. Control information related to monitoring control and transmission information to be subjected to a communication service are multiplexed based on one of a frequency division multiplexing method and a wavelength division multiplexing method. Receiving means for receiving a signal generated and provided via a transmission path, and extracting the transmission information by blocking a component of the control information from components of the signal received by the receiving means Transmission information extracting means, control information extracting means for extracting the control information from the signal received by the receiving means, and monitoring and control processing adapted to the control information extracted by the control information extracting means, and controlling the control information. Monitoring control means for extracting control information to be relayed to a subsequent transmission section of the transmission line, among the information, And sending information,
Transmitting means for generating a relay signal by multiplexing the control information extracted by the monitoring control means based on the one multiplexing method, and transmitting the relay signal to a subsequent transmission section of the transmission path. In the relay transmission device, an operating status determining unit that determines whether the operating status is correct or not for the control information extracting unit and / or the monitoring control unit, and a result of the determination performed by the operating status determining unit. Is false, the transmission information extracting means includes a relay mode switching means for setting an area to be blocked as a component of the control information, in addition to the area where the signal received by the receiving means is distributed. A relay transmission device characterized by the above-mentioned. 3. The relay transmission device according to claim 1, wherein when the result of the determination made by the operation status determining means is false, the information is extracted by the monitoring control means and provided to the transmitting means. A relay transmission device comprising: a regenerative relay blocking unit for invalidating control information to be disabled. 4. The relay transmission device according to claim 1, wherein when the result of the determination made by the operation status determination unit is false, the control information extraction unit extracts the control information from the signal received by the reception unit. (2) a process of extracting control information and a process of monitoring and controlling the control information to extract and / or control information of control information to be relayed to a subsequent transmission section of the transmission line. A relay transmission device characterized by comprising means.