JP2005191750A - Communication apparatus and wireless apparatus and station side apparatus utilizing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication apparatus for setting again a tap coefficient of an equalizer in a prescribed timing. <P>SOLUTION: An estimate section 38 estimates a tap coefficient reflecting a transmission characteristic of a wired communication line on the basis of a training signal included in a signal 204 before equalization received at start and a stored training signal. An equalization section 40 receives a tap coefficient from the estimate section 38 in advance and sets the coefficient to a corresponding tap. The equalization section 40 equalizes the received signal 204 before the equalization on the basis of the tap coefficient after the setting and outputs the result as a signal 206 after the equalization. A measurement 44 measures an error rate of information included in a signal demodulated by a signal processing section 30. A trigger generating section 46 receives a result of the error rate measured by the measurement section 44 and outputs a trigger signal when the error rate exceeds a threshold value. A power supply control section 48 manages a power supply so as to restart a wired section 16 when receiving the trigger signal. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a communication apparatus, a radio apparatus using the same, and a station side apparatus, and more particularly to a communication apparatus for controlling timing for setting an equalizer and a radio apparatus and a station side apparatus using the communication apparatus.

In mobile phone systems, PHS (registered trademark), third-generation mobile phone systems, etc., a base station device and a terminal device are connected by a wireless communication line, and the base station device is further connected by a wired communication line to a station-side exchange, etc. Connect to. For example, in PHS, an ISDN (Integrated Services Digital Network) is used as a wired communication line to connect to the exchange on the station side. A signal transmitted through a wired communication line is generally affected by transmission distortion generated on the line. Such transmission distortion includes attenuation distortion and group delay distortion. The attenuation distortion acts so that the attenuation width of the signal varies depending on the frequency component. On the other hand, group delay distortion is a phenomenon in which a difference occurs in the time to reach the receiving side due to frequency components. In order to correct these distortions, an equalizer is generally used (see Non-Patent Document 1, for example).
"Modem Functions and Trends", Nikkei Data Pro PC, Nikkei BP, September 1993

  One means for bidirectional transmission over a wired communication line is an echo canceller system. Since the echo canceller system uses a signal in the same band on the transmission side and the reception side, it is necessary to separate the signal on the transmission side from the reception signal. Therefore, the signal to be received is extracted by removing the same waveform as the signal transmitted by the receiver on the receiving side. In recent years, for the purpose of miniaturization and the like, a circuit that combines an equalizer, an echo canceller, and a transmission / reception function has been developed. One such circuit receives a predetermined known training signal from the wired communication line side at the time of circuit startup, and initializes tap coefficients included in the equalizer based on the received training signal. To do. The initialized tap coefficient is fixed as it is and used for data reception.

  However, if data communication is performed over a long period of time after the circuit is activated, the equalizer tap coefficient may deviate from the optimum value. In other words, the tap coefficient should reflect the transmission line characteristics of the wired communication line. Generally, if the tap coefficient is set for a long period of time, it will deviate from the actual transmission line characteristics due to line construction and aging. . If the tap coefficient is not an optimum value, the distortion correcting function by the equalizer is lowered, and the transmission characteristics by the wired communication line are also lowered.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a communication device that controls the setting of a tap coefficient of an equalizer according to a change in transmission path characteristics, and a radio device and a station-side device using the communication device. Is to provide.

One embodiment of the present invention is a communication device. This apparatus receives a training signal at a timing when power is turned on via a line interface unit for connecting a wired communication line and the line interface unit, and estimates transmission characteristics of the wired communication line based on the received training signal. An estimation unit, an equalization unit for equalizing a data signal received via the line interface unit based on the estimated transmission characteristics, a signal processing unit for processing the equalized data signal, and a timing when power is turned on Thereafter, a trigger for timing to turn on the power is input, and a power control unit that instructs to turn on the power again based on the input trigger is provided. In this apparatus, the estimation unit may estimate the transmission characteristics of the wired communication line again at the power-on timing.
With the above apparatus, even after the power is turned on, the transmission characteristics are re-estimated by turning the power on again. Therefore, even if the transmission characteristics of the wired communication line change, the transmission quality can be prevented from deteriorating.

  The line interface unit connects a plurality of wired communication lines, the estimation unit estimates transmission characteristics of the plurality of wired communication lines, and the equalization unit receives a plurality of data signals received via the line interface. The signal processing unit processes each of the plurality of equalized data signals, and the power supply control unit restarts the power supply to the estimation unit corresponding to one of the plurality of wired communication lines. You may instruct. A measurement unit that measures the error rate of the processed data signal and a trigger for when the power should be turned on to the power control unit when the measured data signal error rate deteriorates below a predetermined threshold You may further provide the trigger production | generation part to perform. A detection unit that detects disconnection of the wired communication line connected to the line interface unit, and a trigger generation unit that outputs a trigger at a timing to turn on the power when the disconnection of the wired communication line is detected You may prepare. A storage unit for storing a time to generate a trigger for timing to turn on the power; and a trigger generation unit for outputting a trigger for timing to turn on the power based on the stored time. Good.

  Another aspect of the present invention is also a communication device. This device receives the training signal at the timing when the reset request is input via the line interface unit for connecting the wired communication line and the line interface unit, and estimates the transmission characteristics of the wired communication line based on the received training signal. Based on the estimated transmission characteristics, an equalization unit that equalizes the data signal received through the line interface unit, a signal processing unit that processes the equalized data signal, and a reset request After the timing, a reset control unit is provided that inputs a trigger at a timing when a reset request should be input, and instructs re-input of the reset request based on the input trigger. In this apparatus, the estimation unit may estimate the transmission characteristics of the wired communication line again at the timing of resetting the reset request.

  The line interface unit connects a plurality of wired communication lines, the estimation unit estimates transmission characteristics of the plurality of wired communication lines, and the equalization unit receives a plurality of data signals received via the line interface. The signal processing unit processes each of the plurality of equalized data signals, and the reset control unit re-enters the reset request to the estimation unit corresponding to one of the plurality of wired communication lines. May be indicated. A measurement unit that measures the error rate of the processed data signal, and a trigger for when a reset request should be input to the reset control unit when the error rate of the measured data signal deteriorates below a predetermined threshold value. You may further provide the trigger production | generation part to output. A detection unit that detects disconnection of a wired communication line connected to the line interface unit, and a trigger generation unit that outputs a trigger at a timing when a reset request should be input to the reset control unit when disconnection of the wired communication line is detected Further, it may be provided. A storage unit that stores a time at which a trigger for generating a reset request is to be generated; and a trigger generation unit that outputs a trigger at a timing at which a reset request is to be input to the reset control unit based on the stored time. May be.

  Yet another embodiment of the present invention is a wireless device. This apparatus receives a training signal at a timing when power is turned on via a line interface unit for connecting a wired communication line and the line interface unit, and estimates transmission characteristics of the wired communication line based on the received training signal. Based on the estimated transmission characteristics, an equalization unit that equalizes a data signal received via the line interface unit, a signal processing unit that processes the equalized data signal, and the equalized data signal Enter the wireless unit to be transmitted to the wireless terminal device via the wireless communication line and the trigger for when the power should be turned on after the power is turned on, and instruct the power to be turned on again based on the entered trigger A power supply control unit. In this apparatus, the estimation unit may estimate the transmission characteristics of the wired communication line again at the power-on timing.

  Yet another embodiment of the present invention is also a wireless device. This device receives the training signal at the timing when the reset request is input via the line interface unit for connecting the wired communication line and the line interface unit, and estimates the transmission characteristics of the wired communication line based on the received training signal. An equalization unit that equalizes a data signal received via the line interface unit based on the estimated transmission characteristics, a signal processing unit that processes the equalized data signal, and an equalized data signal After the timing at which the reset request is input after inputting the reset request to the wireless terminal device via the wireless communication line, the trigger for the timing at which the reset request should be input is input, and the reset request is input based on the input trigger. A reset control unit for instructing re-input. In this apparatus, the estimation unit may estimate the transmission characteristics of the wired communication line again at the timing of resetting the reset request.

  Yet another embodiment of the present invention is a station-side device. This apparatus receives a training signal at a timing when power is turned on via a line interface unit for connecting a wired communication line and the line interface unit, and estimates transmission characteristics of the wired communication line based on the received training signal. Based on the estimated transmission characteristics, an equalization unit that equalizes a data signal received via the line interface unit, a signal processing unit that processes the equalized data signal, and the equalized data signal And an exchange interface unit for transmitting to the exchange, and a power supply control unit for inputting a trigger at a timing when the power should be turned on after the power is turned on and instructing the power to be turned on again based on the input trigger. . In this apparatus, the estimation unit may estimate the transmission characteristics of the wired communication line again at the power-on timing.

  Yet another embodiment of the present invention is also a station-side device. This device receives the training signal at the timing when the reset request is input via the line interface unit for connecting the wired communication line and the line interface unit, and estimates the transmission characteristics of the wired communication line based on the received training signal. An equalization unit that equalizes a data signal received via the line interface unit based on the estimated transmission characteristics, a signal processing unit that processes the equalized data signal, and an equalized data signal Is input to the exchange interface unit and the trigger for the timing at which the reset request should be input after the timing at which the reset request is input, and reset control that instructs the reset request to be input again based on the input trigger A part. In this apparatus, the estimation unit may estimate the transmission characteristics of the wired communication line again at the timing of resetting the reset request.

  It should be noted that any combination of the above-described constituent elements and a conversion of the expression of the present invention between a method, an apparatus, a system, a recording medium, a computer program, etc. are also effective as an aspect of the present invention.

  According to the present invention, it is possible to control the setting of the tap coefficient of the equalizer in accordance with a change in transmission path characteristics.

(Example 1)
Before describing the present invention in detail, an outline will be described. Embodiment 1 of the present invention relates to a communication circuit that targets PHS as a communication system, is included in a base station device, and serves as an interface with a wired communication line. Further, since the communication system of the wired communication line is an echo canceller system, the communication circuit of the present embodiment includes an echo canceller, and further includes an equalizer for improving transmission characteristics. When activated, the communication circuit receives a training signal from a wired communication line according to a predetermined procedure, and sets the tap coefficient of the equalizer based on the received training signal. Thereafter, equalization processing is performed with the set tap coefficient, and the equalized signal is demodulated. On the other hand, in parallel with the demodulation process, the communication circuit of this embodiment measures the error rate of the equalized signal. If the measured error rate is greater than a predetermined threshold, the communication circuit restarts and sets the equalizer tap coefficient again.

FIG. 1 illustrates a configuration of a communication system 100 according to the first embodiment. The communication system 100 includes a terminal device 10, a base station device 12, a station side device 20, and a network 22. The base station apparatus 12 includes a wireless unit 14, a wired unit 16, and a control unit 18. Further, the signal includes an internal signal 200 and a wired transmission signal 202.
The terminal device 10 is connected to the base station device 12 and provides a call function and a data communication function to a user who owns the terminal device 10. Note that the terminal device 10 may provide these functions independently, but may provide the functions while connected to a personal computer or the like.

  The base station device 12 connects the terminal device 10 to the wireless side, and connects the station side device 20 to the wired side. As a result, the terminal device 10 and the station side device 20 are relayed. Among them, the wireless unit 14 has a wireless communication function for connecting to the terminal device 10 and executes processes such as modulation / demodulation, frequency conversion, and amplification. The wired unit 16 has a wired communication function for connecting to the station-side device 20 and executes processes such as modulation / demodulation, equalization, and echo canceller, for example. Note that the protocol conversion between the wireless communication system and the wired communication system is included in one of the wireless unit 14 and the wired unit 16, but such a protocol conversion does not directly affect the present invention and will be described here. Is omitted. Further, an internal signal 200 is defined as a signal between the wireless unit 14 and the wired unit 16, and a wired transmission signal 202 is defined as a signal between the wired unit 16 and the station side device 20. The control unit 18 controls the timing of the base station apparatus 12 as a whole.

  The station side device 20 is installed inside the station and includes an exchange or the like. Moreover, although the station side apparatus 20 also includes the wired part 16, since it is substantially the same as the function of the wired part 16 contained in the base station apparatus 12, description is abbreviate | omitted below. Further, the station side device 20 is connected to the network 22.

FIG. 2 shows the configuration of the wired unit 16. The wired unit 16 includes a signal processing unit 30, a transmission unit 32, an interface 34, an estimation unit 38, an equalization unit 40, an echo canceller 42, a measurement unit 44, a trigger generation unit 46, and a power supply control unit 48. The signal includes a pre-equalization signal 204 and a post-equalization signal 206.
The signal processing unit 30 is an interface with the radio unit 14, inputs a signal to be transmitted from the terminal device 10 to the station side device 20 as the internal signal 200, and adds or removes a predetermined signal for protocol conversion. Then, a signal is output to the transmission unit 32. On the other hand, as processing opposite to this, a signal to be transmitted from the station-side device 20 to the terminal device 10 is output as the internal signal 200. At this time, a predetermined signal is added or removed for protocol conversion.

The transmission unit 32 receives the signal from the signal processing unit 30 and converts it into a signal format that can be transmitted via a wired communication line for output to the station side device 20. An example of such signal conversion is modulation.
The interface 34 outputs a signal to the station side device 20 and inputs a signal from the station side device 20. Here, since the wired communication line employs an echo canceller system, output and input processing are performed in parallel. In addition, signals input to and output from the station side device 20 are collectively referred to as a wired transmission signal 202, and a signal output to the equalization unit 40 is referred to as a pre-equalization signal 204.

  The estimation unit 38 stores a training signal in advance, and estimates a tap coefficient that reflects the transmission path characteristics of the wired communication line from the training signal included in the pre-equalization signal 204 received at the time of startup and the stored training signal. To do. Here, the tap coefficient is estimated by an adaptive algorithm such as a LMS (Least Mean Square) algorithm or a correlation process. Further, the estimated tap coefficient is output to the equalization unit 40. In addition, the estimation unit 38 recognizes the timing at the time of activation according to an instruction from the power supply control unit 48 described later.

The equalization unit 40 inputs the tap coefficient from the estimation unit 38 in advance and sets it to the corresponding tap. After the setting, the pre-equalization signal 204 input based on the tap coefficient is equalized, and the result is output as the post-equalization signal 206. Although the structure of the equalization part 40 is mentioned later, it is comprised by a transversal filter, for example.
The echo canceller 42 removes the signal component output from the transmission unit 32 from the equalized signal 206 that has passed through the signal processing unit 30 and extracts only the signal to be received. An example of the processing of the echo canceller 42 multiplies the signal output from the transmission unit 32 by a predetermined coefficient, and removes the multiplication result from the equalized signal 206. Here, it is assumed that the predetermined coefficient is sequentially updated even during the processing of the echo canceller. Note that the signal to be received extracted by the echo canceller 42 may be demodulated by the signal processing unit 30.

The measuring unit 44 measures an error rate of information included in the signal to be received extracted by the echo canceller 42 or the signal demodulated by the signal processing unit 30. For example, when a CRC bit is included in the signal, the error rate is measured by counting CRC errors.
The trigger generation unit 46 inputs the result of the error rate measured by the measurement unit 44, and outputs a trigger signal when the error rate exceeds a threshold value.
The power supply control unit 48 manages the power supply so that the wired unit 16 is restarted when a trigger signal is input. Further, if restarted, it notifies the estimation unit 38 that it has restarted.

  This configuration can be realized in terms of hardware by a CPU, memory, or other LSI of an arbitrary computer, and in terms of software, it is realized by a program having a reservation management function loaded in memory. The functional block realized by those cooperation is drawn. Accordingly, those skilled in the art will understand that these functional blocks can be realized in various forms by hardware only, software only, or a combination thereof.

  FIG. 3 shows the configuration of the equalization unit 40. The equalization unit 40 includes a first delay unit 50a, a second delay unit 50b, an N-1 delay unit 50 (n-1), and a first holding unit 52a, which are collectively referred to as a delay unit 50. , Second holding unit 52b, third holding unit 52c, Nth holding unit 52n, first multiplication unit 54a, second multiplication unit 54b, third multiplication unit 54c, Nth multiplication unit 54n, which are collectively referred to as multiplication unit 54, A summation unit 56 is included.

  The tap coefficient calculated in advance by the estimation unit 38 (not shown) is set in the holding unit 52 in advance. The holding unit 52 holds the set tap coefficient until a new tap coefficient is input. The delay unit 50 delays the input pre-equalization signal 204. The multiplier 54 multiplies the pre-equalization signal 204 delayed by the delay unit 50 and the tap coefficient held in the holding unit 52. The summation unit 56 adds the multiplied results and outputs the result as an equalized signal 206.

  FIG. 4 is a flowchart showing the operation at the time of activation. When the user or the like turns on the power of the wired unit 16 (S10), the power control unit 48 also recognizes the activation. After executing the predetermined sequence, the estimation unit 38 receives the training signal included in the pre-equalization signal 204 (S12). The estimation unit 38 estimates transmission path characteristics, that is, tap coefficients based on the received training signal (S14). The estimation unit 38 sets the estimated tap coefficient in the equalization unit 40 (S16). Thereafter, the equalization unit 40 equalizes the received pre-equalization signal 204. Further, the echo canceller 42 is set based on the equalized signal in order to remove the transmission signal from the equalized signal (S18).

  The predetermined sequence executed before the estimation unit 38 receives the training signal may be arbitrary. For example, the station side device 20 (not shown) may be notified by the wired transmission signal 202 that the wired unit 16 has been activated, and the station side device 20 may request transmission of a training signal. Further, if the station side device 20 detects the activation of the wired unit 16, the training signal may be automatically transmitted.

  FIG. 5 is a flowchart showing the operation at the time of restart. Here, it is assumed that the processing shown in FIG. 4 has already been executed and the wired transmission signal 202 is actually received. The measuring unit 44 measures the error rate of the demodulated signal (S20). When the error rate becomes larger than the threshold value (Y in S22), the trigger generation unit 46 outputs a trigger signal, and the power supply control unit 48 resets the wired unit 16 (S24). After executing the predetermined sequence, the estimation unit 38 receives the training signal included in the pre-equalization signal 204 (S26). The estimation unit 38 estimates transmission path characteristics, that is, tap coefficients based on the received training signal (S28). The estimation unit 38 sets the estimated tap coefficient in the equalization unit 40 (S30). Thereafter, the equalization unit 40 equalizes the received pre-equalization signal 204. Further, the echo canceller 42 is set based on the equalized signal in order to remove the transmission signal from the equalized signal (S32). On the other hand, when the error rate does not become larger than the threshold (N in S22), the trigger generation unit 46 performs the reception as it is.

  The operation of the wired unit 16 having the above configuration will be described. When the wired unit 16 is activated, the estimation unit 38 estimates the tap coefficient from the received training signal and sets it in the equalization unit 40. After the setting is completed, the equalization unit 40 equalizes the received pre-equalization signal 204, and the echo canceller 42 performs echo cancellation processing. The signal processing unit 30 demodulates the signal subjected to echo cancellation processing, and the measurement unit 44 measures the error rate of the demodulated signal. If the error rate exceeds the threshold value, the trigger generation unit 46 outputs a trigger signal, and the power supply control unit 48 restarts the wired unit 16. By restarting, the estimation unit 38 again estimates the tap coefficient from the training signal and sets it in the equalization unit 40.

  According to the first embodiment of the present invention, when the error rate of the received signal is worse than the threshold value, it is estimated that the already set tap coefficient has deviated from the actual transmission path characteristics, and the restart is performed. Can improve the quality of the received signal.

(Example 2)
Embodiment 2 of the present invention relates to a communication apparatus similar to that of Embodiment 1, and estimates a change in transmission path characteristics and restarts the communication apparatus. However, unlike the error rate of the first embodiment, the communication device according to the second embodiment restarts the communication device when the disconnection of the wired communication circuit is detected.

  FIG. 6 illustrates a configuration of the wired unit 16 according to the second embodiment. Unlike the wired unit 16 in FIG. 2, the wired unit 16 includes a detection unit 60. The detection unit 60 monitors the received internal signal 200 or the internal signal 200 to be transmitted. When the wired communication line is disconnected, the detection unit 60 notifies the trigger generation unit 46 that the wired unit 16 has been disconnected to restart. To do. Here, the disconnection of the wired communication line is determined based on the power value of the received internal signal 200 and the presence / absence of a response to the transmitted internal signal 200. The operation after detecting the disconnection of the wired communication line is the same as in the first embodiment.

  The operation of the wired unit 16 having the above configuration will be described. When the wired unit 16 is activated, the estimation unit 38 estimates the tap coefficient from the received training signal and sets it in the equalization unit 40. After the setting is completed, the equalization unit 40 equalizes the received pre-equalization signal 204, and the echo canceller 42 performs echo cancellation processing. Further, the signal processing unit 30 demodulates the signal subjected to the echo cancellation process. The detection unit 60 monitors the state of the wired communication line. If the detection unit 60 determines that the wired communication line is disconnected, the trigger generation unit 46 outputs a trigger signal, and the power supply control unit 48 restarts the wired unit 16. to start. By restarting, the estimation unit 38 again estimates the tap coefficient from the training signal and sets it in the equalization unit 40.

  According to the second embodiment of the present invention, when the wired communication line is disconnected, it is estimated that the already set tap coefficient has deviated from the actual transmission path characteristics, and restart is performed, so the quality of the received signal is improved. it can.

(Example 3)
The third embodiment of the present invention relates to a communication device similar to the previous embodiments, and restarts the communication device by a predetermined trigger. However, unlike the previous embodiments, the communication device according to the third embodiment schedules a time to restart in advance, and restarts the communication device when the time comes.

  FIG. 7 illustrates a configuration of the wired unit 16 according to the third embodiment. Unlike the wired unit 16 of FIG. 2, the wired unit 16 includes a storage unit 62 and a timer 64. The timer 64 corresponds to a clock and outputs time. The storage unit 62 stores a time at which the wired unit 16 should be restarted in advance. For example, it may be stored as 1 am, and the day of the week and date may be stored together with the time. If the time output from the timer 64 matches the time stored in the storage unit 62, the trigger generation unit 46 outputs a trigger signal to the power supply control unit 48. Subsequent operations, that is, restart operations are the same as those in the first embodiment.

  The operation of the wired unit 16 having the above configuration will be described. When the wired unit 16 is activated, the estimation unit 38 estimates the tap coefficient from the received training signal and sets it in the equalization unit 40. After the setting is completed, the equalization unit 40 equalizes the received pre-equalization signal 204, and the echo canceller 42 performs echo cancellation processing. Further, the signal processing unit 30 demodulates the signal subjected to the echo cancellation process. If the time output from the timer 64 matches the time stored in the storage unit 62, the trigger generation unit 46 outputs a trigger signal, and the power supply control unit 48 restarts the wired unit 16. By restarting, the estimation unit 38 again estimates the tap coefficient from the training signal and sets it in the equalization unit 40.

  According to the third embodiment of the present invention, the restart is performed regardless of whether or not the already set tap coefficient has deviated from the actual transmission path characteristics, so that it is possible to prevent the quality of the received signal from being deteriorated.

Example 4
Example 4 of the present invention relates to a communication apparatus similar to Example 1. In the first embodiment, the change in the transmission path characteristic is estimated and the communication apparatus is restarted. However, in the fourth embodiment, the change in the transmission path characteristic is estimated and the part related to the tap coefficient is reset in the communication apparatus. .

FIG. 8 illustrates a configuration of the wired unit 16 according to the fourth embodiment. The wired unit 16 in FIG. 8 includes a reset control unit 66 instead of the power supply control unit 48, as compared with the wired unit 16 in FIG.
The reset control unit 66 resets the portion related to the tap coefficient in the wired unit 16 when a trigger signal is input. That is, the tap coefficient held in the holding unit 52 in the equalization unit 40 is cleared, and a sequence for causing the estimation unit 38 to estimate the tap coefficient again is operated. Finally, the newly estimated tap coefficient is held in the holding unit 52.

According to the fourth embodiment of the present invention, the tap coefficient can be updated to match the latest state without restarting the wired unit 16. In addition, the updated tap coefficient can prevent the quality of the received signal from deteriorating.
The present invention has been described based on the embodiments. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to combinations of the respective constituent elements and processing processes, and such modifications are also within the scope of the present invention. is there.

  According to the first to third embodiments of the present invention, the wired communication line has been described as using the echo canceller system. However, the present invention is not limited to this. For example, the wired communication line may be a TDD (Time Division Duplex) system. According to the present embodiment, the present invention can be applied to various systems. That is, it may be applied when distortion occurs in the transmission path.

According to the first to third embodiments of the present invention, the wired unit 16 connects one wired communication line. However, the present invention is not limited to this. For example, the wired unit 16 may be connected to a plurality of wired communication lines. In that case, the restart of the wired unit 16 by the power supply control unit 48 is not performed for the entire wired unit 16, but is sequentially performed on a part such as the estimation unit 38 corresponding to one of a plurality of wired communication lines. According to this modification, it is possible to support a plurality of wired communication lines, and in this case, all the wired communication lines are not disabled at the same time, so that the communication service can be continuously provided to the terminal device 10.
Any combination of Embodiments 1 to 4 of the present invention is also effective. According to this combination, the effect according to any combination of Examples 1 to 4 can be obtained.

1 is a diagram illustrating a configuration of a communication system according to a first embodiment. It is a figure which shows the structure of the wired part of FIG. It is a figure which shows the structure of the equalization part of FIG. It is a flowchart which shows the operation | movement at the time of starting of FIG. It is a flowchart which shows the operation | movement at the time of restart of FIG. FIG. 6 is a diagram illustrating a configuration of a wired unit according to a second embodiment. FIG. 10 is a diagram illustrating a configuration of a wired unit according to a third embodiment. FIG. 10 is a diagram illustrating a configuration of a wired unit according to a fourth embodiment.

Explanation of symbols

  10 terminal devices, 12 base station devices, 14 wireless units, 16 wired units, 18 control units, 20 station side devices, 22 networks, 30 signal processing units, 32 transmission units, 34 interfaces, 38 estimation units, 40 equalization units, 42 Echo Canceller, 44 Measurement Unit, 46 Trigger Generation Unit, 48 Power Supply Control Unit, 50 Delay Unit, 52 Holding Unit, 54 Multiplying Unit, 56 Summation Unit, 60 Detection Unit, 62 Storage Unit, 64 Timer, 66 Reset Control Unit, 100 communication system 200 internal signal 202 wired transmission signal 204 pre-equalization signal 206 post-equalization signal

Claims (10)

A line interface unit for connecting a wired communication line;
An estimation unit that receives a training signal at a timing when power is turned on via the line interface unit, and estimates transmission characteristics of the wired communication line based on the received training signal;
An equalization unit for equalizing a data signal received via the line interface unit based on the estimated transmission characteristics;
A signal processing unit for processing the equalized data signal;
After the timing of turning on the power, a trigger for timing to turn on the power is input, and based on the input trigger, a power control unit that instructs to turn on the power again,
The estimation unit re-estimates transmission characteristics of the wired communication line at a power-on timing. The line interface unit connects a plurality of wired communication lines,
The estimation unit estimates transmission characteristics of the plurality of wired communication lines,
The equalization unit equalizes each of a plurality of data signals received via the line interface,
The signal processing unit processes each of the equalized data signals,
The communication apparatus according to claim 1, wherein the power control unit instructs the estimation unit corresponding to any of the plurality of wired communication lines to turn on the power again. A measurement unit for measuring an error rate of the processed data signal;
The apparatus further comprises a trigger generation unit that outputs a trigger at a timing to turn on the power to the power control unit when the error rate of the measured data signal is deteriorated from a predetermined threshold value. The communication device according to claim 1 or 2. A detection unit for detecting disconnection of a wired communication line connected to the line interface unit;
3. The communication apparatus according to claim 1, further comprising: a trigger generation unit that outputs a trigger at a timing when the power is to be turned on to the power control unit when the disconnection of the wired communication line is detected. . A storage unit for storing a time to generate a trigger for timing to turn on the power;
The communication apparatus according to claim 1, further comprising a trigger generation unit that outputs a trigger at a timing at which the power is to be turned on, based on the stored time. A line interface unit for connecting a wired communication line;
An estimation unit that receives a training signal at a timing when a reset request is input through the line interface unit, and estimates transmission characteristics of the wired communication line based on the received training signal;
An equalization unit for equalizing a data signal received via the line interface unit based on the estimated transmission characteristics;
A signal processing unit for processing the equalized data signal;
A reset control unit that inputs a trigger at a timing at which a reset request should be input after the timing at which the reset request is input, and that instructs re-input of a reset request based on the input trigger,
The estimation unit re-estimates transmission characteristics of the wired communication line at a reset request re-input timing. A line interface unit for connecting a wired communication line;
An estimation unit that receives a training signal at a timing when power is turned on via the line interface unit, and estimates transmission characteristics of the wired communication line based on the received training signal;
An equalization unit for equalizing a data signal received via the line interface unit based on the estimated transmission characteristics;
A signal processing unit for processing the equalized data signal;
A wireless unit that transmits the equalized data signal to a wireless terminal device via a wireless communication line;
After the timing of turning on the power, a trigger for timing to turn on the power is input, and based on the input trigger, a power control unit that instructs to turn on the power again,
The wireless device according to claim 1, wherein the estimation unit re-estimates transmission characteristics of the wired communication line at a power-on timing. A line interface unit for connecting a wired communication line;
An estimation unit that receives a training signal at a timing when a reset request is input through the line interface unit, and estimates transmission characteristics of the wired communication line based on the received training signal;
An equalization unit for equalizing a data signal received via the line interface unit based on the estimated transmission characteristics;
A signal processing unit for processing the equalized data signal;
A wireless unit that transmits the equalized data signal to a wireless terminal device via a wireless communication line;
A reset control unit that inputs a trigger at a timing at which a reset request should be input after the timing at which the reset request is input, and that instructs re-input of a reset request based on the input trigger,
The wireless device according to claim 1, wherein the estimation unit re-estimates transmission characteristics of the wired communication line at a reset request re-input timing. A line interface unit for connecting a wired communication line;
An estimation unit that receives a training signal at a timing when power is turned on via the line interface unit, and estimates transmission characteristics of the wired communication line based on the received training signal;
An equalization unit for equalizing a data signal received via the line interface unit based on the estimated transmission characteristics;
A signal processing unit for processing the equalized data signal;
An exchange interface unit for transmitting the equalized data signal to the exchange;
After the timing of turning on the power, a trigger for timing to turn on the power is input, and based on the input trigger, a power control unit that instructs to turn on the power again,
The station side apparatus characterized in that the estimation unit estimates again the transmission characteristics of the wired communication line at a power-on timing. A line interface unit for connecting a wired communication line;
An estimation unit that receives a training signal at a timing when a reset request is input through the line interface unit, and estimates transmission characteristics of the wired communication line based on the received training signal;
An equalization unit for equalizing a data signal received via the line interface unit based on the estimated transmission characteristics;
A signal processing unit for processing the equalized data signal;
An exchange interface unit for transmitting the equalized data signal to the exchange;
A reset control unit that inputs a trigger at a timing at which a reset request should be input after the timing at which the reset request is input, and that instructs re-input of a reset request based on the input trigger,
The station side apparatus characterized in that the estimation unit again estimates the transmission characteristics of the wired communication line at the timing of resetting a reset request.

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