JP6184092B2 - Transmission apparatus and transmission system - Google Patents

Description

  The present invention relates to a reduction in power consumption of a transmission apparatus, and in particular, by monitoring signal quality and controlling a voltage applied to a device and a control circuit, the required performance is ensured while reducing power consumption. The present invention relates to a transmission apparatus and a transmission system to be realized.

  With the spread of the Internet and mobile phones / smartphones, communication networks are becoming increasingly important as social infrastructure. In addition, since the increase in capacity of communication networks is accelerating, suppression of power consumption of transmission devices is an important issue.

  In the past, some transmission devices have taken measures to limit power supply when not needed or to reduce standby power. In the wireless transmission device, a technology for suppressing an increase in power by optimizing a transmission rate and a transmission method according to a traffic amount has been developed. On the other hand, for optical transmission equipment used in backbone networks, approaches that reduce power consumption per transmission bit by increasing the speed are the mainstream, and approaches that optimize equipment power consumption according to the transmission environment and transmission performance Is not practically used.

For example, a technique disclosed in Patent Document 1 is known as an optimal control method for a power supply circuit of a transmission apparatus.
FIG. 5 is a diagram illustrating a configuration of a conventional transmission device disclosed in Patent Document 1. In FIG. Japanese Patent Application Laid-Open No. H10-228688 discloses a method of obtaining high power efficiency by controlling a power supply voltage based on the amplitude of a signal output from a transmission line circuit. Details will be described below.

The transmission apparatus shown in FIG. 5 includes an S / P converter 111 for serial / parallel conversion of transmission data, a carrier mapper 112, an IFFT converter 121 for converting frequency domain data into a time domain signal, and an IFFT converter 121. Are stored in the internal buffer, and sequentially output, a P / S converter 122, a DA converter 123 that outputs a differential analog signal, a BPF (bandpass filter) 124, and a transmission line driver circuit (driver) 125. And driver sending resistors 126 ₁ and 126 ₂ , a transformer 127, and a transmission path 128. The driver power supply unit 131 includes a power supply control unit 141 and a power supply circuit 142. In this signal transmission device, when the ratio PAR (Peak Average Ratio) between the instantaneous maximum output voltage and the average output voltage is extremely large, such as DMT (Discrete Multi Tone), the drive voltage of the driver is lowered when the output voltage is low, When the output voltage is high, the power efficiency is increased by controlling the drive voltage of the driver. Specifically, the power supply control unit 141 converts the received signal into time-domain data for one symbol by the IFFT conversion unit 121 and accumulates the converted data string in the built-in buffer of the P / S conversion unit 122. The minimum voltage necessary for outputting the data string from the driver 125 is set.

Japanese Patent Application No. 2000-619891

  In the transmission apparatus disclosed in Patent Document 1, when the PAR is extremely large, the power efficiency can be increased. However, when the PAR is small, there is a problem that the power efficiency cannot be increased and the power consumption cannot be reduced. In addition, there is a problem that power consumption cannot be minimized according to the environment of the transmission network or device and the transmission performance achieved, and sufficient power saving cannot be realized.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a transmission apparatus and a transmission system that realizes a reduction in power consumption regardless of whether the PAR is large or small.

Transmission apparatus according to this invention converts a receiving unit having a receiving circuit for converting a received optical signal into an electric signal, a transmitter having a transmission circuit for transmitting the converted electrical signals to optical signals, the receiver circuit Quality monitoring means for monitoring the quality of the electrical signal and the quality of the electrical signal monitored by converting the optical signal into an electrical signal in the transmission device that has received the optical signal from the transmission circuit; Common circuit necessary for realizing both functions of the transmission unit and the transmission unit, a common circuit voltage control unit for controlling the drive voltage of the common circuit, and the whole for controlling the common circuit voltage control unit based on the monitoring result by the quality monitoring means A control circuit, and the overall control circuit controls the common circuit voltage control unit so that the power consumption is reduced within a range in which the quality monitored by the quality monitoring means maintains the required quality. A.

  According to this invention, since it comprised as mentioned above, there exists an effect that a power consumption fall is realizable irrespective of the case where it is small when PAR is large.

It is a figure which shows the structure of the transmission apparatus which concerns on Embodiment 1 of this invention. It is a flowchart which shows operation | movement of the transmission apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of the transmission system which concerns on Embodiment 2 of this invention. It is a flowchart which shows operation | movement of the transmission system which concerns on Embodiment 2 of this invention. It is a figure which shows the structure of the conventional transmission apparatus.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a diagram showing a configuration of a transmission apparatus according to Embodiment 1 of the present invention.
As shown in FIG. 1, the transmission apparatus according to the present invention includes a transmission circuit 1, a voltage control unit (transmission circuit voltage control unit) 2, a reception circuit 3, a voltage control unit (reception circuit voltage control unit) 4, a BER monitor (quality). Monitor means) 5, counter BER monitor (quality monitor means) 6, common circuit 7, voltage control unit 8, and overall control circuit 9.

The transmission circuit 1 converts an electrical signal into an optical signal, and transmits the optical signal to a transmission device (opposite device) (not shown) that faces the optical signal.
The voltage control unit 2 controls the drive voltage of the transmission circuit 1.
The transmission circuit 1 and the voltage control unit 2 constitute a transmission unit 10.

The receiving circuit 3 receives an optical signal from the opposing device and converts the optical signal into an electric signal.
The voltage control unit 4 controls the drive voltage of the receiving circuit 3.
The receiving circuit 3 and the voltage control unit 4 constitute a receiving unit 11.

The BER monitor 5 measures the quality of the electrical signal converted by the receiving circuit 3 (for example, a bit error rate (BER) or the number of code errors).
The counter BER monitor 6 monitors the quality of the electrical signal monitored by converting the optical signal into an electrical signal in the transmission apparatus (opposite apparatus) that has received the optical signal from the transmission circuit 1. At this time, the opposite BER monitor 6 monitors quality information (BER) transmitted from the opposite device.

The common circuit 7 is a circuit necessary for realizing the functions of both the transmission unit 10 and the reception unit 11.
The voltage control unit 8 controls the drive voltage of the common circuit 7.

  The overall control circuit 9 controls the entire transmission apparatus. At this time, the overall control circuit 9 controls the voltage control unit 4 based on the monitoring result by the BER monitor 5 so as to reduce the power consumption within a range in which the required quality (BER) is maintained. Moreover, based on the monitoring result by the opposing BER monitor 6, the voltage control part 2 is controlled so that power consumption may be reduced in the range which maintains required quality (BER). Furthermore, based on the monitoring results from the BER monitor 5 and the counter BER monitor 6, the voltage control unit 8 is controlled so as to reduce the power consumption within a range in which the required quality (BER) is maintained.

Next, the operation of the transmission apparatus configured as described above will be described with reference to FIG. First, a control method for realizing low power consumption of the receiving unit 11 will be described.
The receiving unit 11 receives an optical signal from the opposing transmission device, performs photoelectric conversion in the receiving circuit 3, and converts the optical signal into an electrical signal. Next, the BER monitor 5 performs BER measurement to monitor the quality of the converted electrical signal. Next, the overall control circuit 9 receives the value of the BER measured by the BER monitor 5 and controls the voltage control unit (voltage control unit 4) of the corresponding circuit (reception circuit 3). Hereinafter, the operation of the overall control circuit 9 will be described with reference to FIG.

  In the operation of the overall control circuit 9, as shown in FIG. 2, first, a BER value (BER0) measured by a BER monitor (BER monitor 5, counter BER monitor 6) is received as a reference BER value (step ST21).

  After receiving the BER value (BER0), the voltage control unit (voltage control unit 4, voltage control unit 2, voltage control unit 8) of the corresponding circuit (reception circuit 3, transmission circuit 1, common circuit 7) A command for lowering the drive voltage of the circuit is issued (step ST22).

  After the drive voltage of the corresponding circuit is lowered, the BER value (BER1) measured by the BER monitor is received as the current BER value (step ST23).

  Next, the reference BER value (BER0) is compared with the current BER value (BER1) to check whether or not the fluctuation range of the BER is within a threshold (step ST24).

  If the fluctuation range of the BER is within the threshold in step ST24, a command to lower the drive voltage is issued to the power supply control unit of the corresponding circuit in order to further lower the drive voltage (step ST25). Thereafter, the sequence returns to step ST23.

  On the other hand, if the fluctuation range of BER exceeds the threshold value in step ST24, the drive voltage set to the previous circuit is set to the previous drive voltage in order to restore the drive voltage that has been lowered too much. The setting is made to increase the drive voltage to the power supply control unit of the corresponding circuit so that the voltage becomes the voltage, and the setting is completed (steps ST26 and 27).

Next, a control method for realizing low power consumption of the transmission unit 10 will be described.
In the transmission unit 10, the transmission circuit 1 transmits an optical signal to the opposite device, and BER measurement is performed in the opposite device. Next, the transmission device (own device) that reduces power consumption receives the result (quality information) measured by the opposite device, monitors it with the opposite BER monitor 6, and then inputs the result to the overall control circuit 9. Next, the overall control circuit 9 receives the BER value measured by the counter BER monitor 6 as input, and controls the voltage control unit (voltage control unit 2) of the corresponding circuit (transmission circuit 1). The operation of the overall control circuit 9 at this time is the same as the operation when realizing the power consumption of the receiving unit 11, and operates according to the flow of FIG.

Finally, a control method for realizing low power consumption of the common circuit 7 will be described.
Since the common circuit 7 is a circuit that affects both the transmission unit 10 and the reception unit 11, changing the drive voltage of the common circuit 7 affects transmission / reception of the transmission apparatus. For example, FEC-LSI that performs error correction code addition and error correction corresponds to this.
The control method for realizing the low power consumption of the common circuit 7 is the same as the method for realizing the low power consumption of the receiving unit 11 and the method of realizing the low power consumption of the transmitting unit 10, and the BER monitor 5 The overall control circuit 9 controls the voltage control unit (voltage control unit 8) of the corresponding circuit (common circuit 7) based on both the BER value measured by the BER and the BER value measured by the counter BER monitor 6. Do. At this time, by changing the driving voltage of the common circuit 7, two types of BER values, that is, a BER value obtained as a result of the change on the transmission side and a BER value obtained as a result of the change on the reception side are obtained. By comparing the BER value with a worse BER value with the BER value before the voltage change, it is possible to perform voltage control of the common portion according to the flow of FIG.

  As described above, according to the first embodiment, the BER measurement is performed by the BER monitor 5 and / or the counter BER monitor 6, and the low power consumption of the transmission unit 10, the reception unit 11, and the common circuit 7 is based on the result. Therefore, the power consumption can be reduced regardless of whether the PAR is large or small.

Embodiment 2. FIG.
FIG. 3 is a diagram showing a configuration of a transmission system according to Embodiment 2 of the present invention. Transmission apparatus A and transmission apparatus B shown in FIG. 3 have the same configuration as that of the transmission apparatus according to the first embodiment shown in FIG. Note that the suffix “a” is attached to the reference numeral for the internal configuration of the transmission apparatus A, and the suffix “b” is attached to the reference sign for the internal configuration of the transmission apparatus B.

  In the transmission system in which two transmission apparatuses A and B face each other as shown in FIG. 3, when each transmission apparatus A and B starts control for realizing low power consumption at a unique timing, which transmission apparatus A and B B cannot correctly perform control for realizing low power consumption. Therefore, in order to realize the control for reducing the power consumption of both transmission apparatuses A and B, the transmission apparatuses A and B have the sequence shown in FIG.

  First, the overall control circuit 9a of the transmission apparatus A performs control for reducing power consumption of the receiving unit 11a, the transmitting unit 10a, and the common circuit 7a according to the flow shown in FIG. 2 (steps ST41 to ST43). In addition, since each step ST41-43 cannot adjust to an optimal voltage if control is started simultaneously, it will control to the next process after one process is completed, and control will not start simultaneously.

Next, the transmission apparatus B confirms whether or not the control flow on the transmission apparatus A side is completed (step ST44). That is, after the transmission apparatus A completes the control for reducing the power consumption, a signal indicating that the control is completed is output to the transmission apparatus B, and the transmission apparatus B receives the signal to transmit the signal on the transmission apparatus A side. Confirm the completion of the control flow.
Note that the transmission apparatus B does not start the control for reducing the power consumption until the control for reducing the power consumption on the transmission apparatus A side is completed. Then, the transmission apparatus B performs the BER measurement of the signal from the transmission apparatus A, transmits the measurement result to the transmission apparatus A, and allows the transmission apparatus A to perform reception side control. The main signal is transmitted.

When the transmission apparatus A completes the control for reducing power consumption in step ST44, the overall control circuit 9b of the transmission apparatus B follows the flow shown in FIG. 11b, the transmitter 10b, and the common circuit 7b are controlled to reduce power consumption (steps ST45 to 47).
At this time, the transmission apparatus A does not start the control for reducing the power consumption until the control for reducing the power consumption on the transmission apparatus B side is completed. Then, the transmission apparatus A performs the BER measurement of the signal from the transmission apparatus B, transmits the measurement result to the transmission apparatus B, and allows the transmission apparatus B to perform reception-side control. The main signal is transmitted.

  As described above, according to the second embodiment, in the transmission system in which the transmission apparatuses A and B face each other, the overall control circuits 9a and 9b of the transmission apparatuses A and B perform voltage control between the transmission apparatuses A and B. Therefore, both transmission apparatuses A and B can correctly realize low power consumption.

  The voltage control by the overall control circuit 9 can be performed at an arbitrary timing (for example, only once at the beginning, or manually controlled again). Further, it is possible to perform control at regular intervals, and it is possible to follow changes in the state of the transmission path by performing control at regular intervals.

  Further, within the scope of the present invention, the invention of the present application can be freely combined with each embodiment, modified with any component in each embodiment, or omitted with any component in each embodiment. .

  1, 1a, 1b transmission circuit, 2, 2a, 2b voltage control unit (transmission circuit voltage control unit), 3, 3a, 3b reception circuit, 4, 4a, 4b voltage control unit (reception circuit voltage control unit), 5, 5a, 5b BER monitor (quality monitor means), 6, 6a, 6b Opposing BER monitor (quality monitor means), 7, 7a, 7b Common circuit, 8, 8a, 8b Voltage controller, 9, 9a, 9b Overall control circuit 10, 10a, 10b transmitter, 11, 11a, 11b receiver.

Claims (6)

A receiving unit having a receiving circuit for converting the received optical signal into an electrical signal;
A transmission unit having a transmission circuit for converting an electrical signal into an optical signal and transmitting the optical signal;
Monitor the quality of the electrical signal converted by the receiving circuit and the quality of the electrical signal monitored by converting the optical signal into an electrical signal in the transmission apparatus that has received the optical signal from the transmitting circuit. Quality monitoring means;
A common circuit necessary for realizing the functions of both the receiver and the transmitter;
A common circuit voltage control unit for controlling the driving voltage of the common circuit;
An overall control circuit for controlling the common circuit voltage control unit based on the monitoring result by the quality monitoring means,
The transmission apparatus according to claim 1, wherein the overall control circuit controls the common circuit voltage control unit so that power consumption is reduced within a range in which the quality monitored by the quality monitoring means maintains a required quality. The receiving unit may have a receiving circuit voltage control unit for controlling the drive voltage of the reception circuit,
The entire control circuit was monitored Ri by the said quality monitoring means, based on the quality of the converted electric signal by the receiving circuit, so that the quality is reduced power consumption in a range to maintain the required quality the transmission apparatus according to claim 1, wherein the that controls the reception circuit voltage controller. The transmission unit may have a transmission circuit voltage control unit for controlling the drive voltage of the transmission circuit,
The entire control circuit was monitored Ri by the said quality monitoring means, the transmission apparatus receives the optical signal from the transmitting circuit, the optical signal is converted into an electric signal to the quality of the monitored the electrical signal based on the transmission apparatus according to claim 1 or claim 2, wherein the that controls the transmission circuit voltage control unit so that the quality is reduced power consumption in a range to maintain the required quality. The transmission apparatus according to any one of claims 1 to 3, wherein the quality monitoring means monitors a code error rate or a number of code errors as the quality of an electric signal. The transmission apparatus according to claim 1, wherein the overall control circuit performs voltage control at a constant cycle interval or at an arbitrary timing. In the transmission system in which the transmission device according to any one of claims 1 to 5 is opposed,
The overall control circuit of each transmission device performs voltage control sequentially between the transmission devices.

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