KR101632038B1 - Adaptive equalizing method for G.hn access network system and the central office using the method - Google Patents

Abstract

In order to provide a high-speed communication of a gigabit or higher by applying G.hn technology for a home network to a telephone line subscriber network, the present invention can effectively reduce crosstalk generated in a high frequency region due to the limitation of a medium according to a domestic wiring environment The present invention relates to an adaptive equalizing method of a G.hn subscriber line concentrator and a concentrator thereof, and more particularly, to an equalizing method of an equalizer used in an analog signal transmission at a domain master by checking high-frequency crosstalk based on a crosstalk report of each domain master, By resetting the set value, it is possible to reduce the crosstalk caused by the signal attenuation in the high frequency band which is not resolved by the synchronization timing adjustment by adjusting the band signal including the high frequency band. Further, by checking the crosstalk state according to the operation of the adjacent domain master or the change of the G.hn communication use environment of the medium constituted by the bundle, and by applying the transmission equalizer setting value differently according to the crosstalk state, It is possible to reduce the crosstalk and improve the performance of the G.hn subscriber line concentrator having a large influence due to environmental changes.

Description

[0001] The present invention relates to an adaptive equalizing method for a G.hn subscriber line network and an aggregating equipment using the same,

The present invention relates to an adaptive equalizing method of a G.hn subscriber line network and a concentrator using the same, and in a case where a G.hn technology for a home network is applied to a telephone line subscriber network to provide high- The present invention relates to an adaptive equalizing method of a G.hn subscriber line network system capable of effectively reducing crosstalk generated in a high frequency region due to a limit of a medium according to the present invention.

Due to the rapid development of various communication technologies and terminals, network services are also being developed to meet the demand for high quality and high capacity multimedia contents.

Therefore, the internet environment is also upgrading to a service environment of 1 Gbps exceeding several hundred Mbps.

Currently, gigabit internet services are based on the case where the domestic wiring environment of apartment houses or single houses is composed of optical cables and UTP lines. In the case where the wiring environment is a copper wiring such as a telephone line or a coaxial cable, New technologies are being researched.

G.hn is a general technical name for home network technology that has been complicated by related organizations including G.996x of ITU-T (International Telecommunication Union-Telecommunication Standardization Sector). It uses existing copper physical medium such as telephone line, power line and coaxial cable To provide a data transmission rate of 1 Gbps or more.

For example, in the case of a communication technology using a telephone line, the ADSL technology that provides a transmission rate of 512 kbps using the 25 kHz to 1.1 MHz band has developed to VDSL2 technology that provides a transmission speed of 200 Mbps using the 25 kHz to 30 MHz band, Is not provided. On the other hand, ITU-T G.996x standard recommendation using a telephone line, G.hn, a high-speed subscriber network technology, can provide a transmission speed of 1 Gbps using a wide band of 2 to 100 MHz. Recently, Research is also being done to double it.

This G.hn technology basically uses OFDM modulation and time division half duplex transmission using a sub-carrier of an appropriate band depending on the medium. For example, in the case of a telephone line, a transmission rate of 1 Gbps is implemented in a 100 MHz band using 2048 subcarriers of 48.828125 kHz band, and a method of using 4096 subcarriers by extending the used band to 200 MHz is also introduced.

If the G.hn technology is applied to the subscriber network, it is possible to connect the building to the premises through an optical line, and to apply the G.hn technology to the already-wired telephone line inside the building, Wire (Gigawire) technology has emerged.

However, due to the characteristics of the existing telephone line wiring system, crosstalk is inevitable in that dozens to hundreds of telephone line pairs are composed of bundles, so that a signal transmitted / received through an adjacent telephone line flows and crosstalk occurs. Especially, the effect of Near End Cross Talk (NEXT) generated in the adjacent area of each port of the concentrator to provide G.hn technology can not be neglected, so it must be solved for high quality service.

Therefore, a reference clock of several tens of KHz is separately generated from the outside of the central office (CO), and each port that manages the individual domestic telephone line in the concentrator equipments is controlled by Coordinate G.hn Network structure has been developed and this method synchronizes the data frame start time of the transmission packet to reduce the NEXT occurring in multiple G.hn DM (Domain Master), thereby preventing a situation affecting the telephone line port of the adjacent reception state .

 However, even if the communication between the concentrator and the CPE (Customer Premises Equipment) is synchronized, the high frequency transmission characteristic is not good due to the characteristics of the copper wire-based home wiring network to be applied, so that the crosstalk due to interference between the high frequency band signals exists .

In particular, when there are a large number of subscribers who are inconsistent with the synchronous clock of a nearby service provider's aggregation equipment, there is a limit in reducing crosstalk between bundles of home wiring. In such a circumstance, communication is performed over a wide bandwidth (100 to 200 MHz) It is difficult to avoid crosstalk between adjacent lines due to signal attenuation in the high frequency region.

Therefore, if G.hn technology is applied to provide an ultra high-speed transmission speed through the existing wiring made of copper wire, it is possible to effectively reduce the high frequency band crosstalk due to the limit of the medium in addition to the method of eliminating the signal mismatch Collecting equipment is required.

Korean Patent No. 10-1403590 [Title of the invention: Method for applying G.hn technology to an access network]

Accordingly, an object of the present invention to solve such a problem is to confirm high-frequency band crosstalk based on a crosstalk report (signal-to-noise ratio) of each domain master (port) configured in a central office (CO) An adaptive equalizing method of a G.hn subscriber line network system that reduces crosstalk caused by signal attenuation in a high frequency band by adjusting band-by-band signals including a high frequency band by resetting an equalizer setting value used in transmission, Equipment.

Another object of the present invention is to confirm the crosstalk state according to the operation of the adjacent domain master or the change of the G.hn communication use environment of the medium constituted by the bundle and to apply the transmission equalizer setting value differently according to the crosstalk state, Adaptive equalizing method of a G.hn subscriber line network system capable of adaptively reducing high frequency band crosstalk and a concentrator using the same.

It is still another object of the present invention to provide a concentrator that allows an equalizer setting value for each terminal, which allows the size and curve characteristic of a received signal for each domain master to be constant at a receiving time according to the distance between the domain master and the terminal, The present invention provides an adaptive equalizing method of a G.hn subscriber line network system and adaptive equalizing apparatuses using the same, in which each terminal adjusts a signal size and a curve characteristic with a corresponding equalizer setting value so as to adaptively reduce crosstalk.

It is another object of the present invention to provide an equalizer setting curve corresponding to a signal-to-noise curve pattern for each domain master, thereby reducing loss of a high-frequency band signal in response to various environmental changes, The present invention provides an adaptive equalizing method of a G.hn subscriber line network and a concentrator using the same.

An adaptive equalizing method of a G.hn subscriber line network system according to an embodiment of the present invention includes an aggregate equipment (CO) having a plurality of domain masters connected to a customer premises equipment (CPE) A central office receiving a crosstalk report for each domain master; An equalizer setting information generating step of generating transmission equalizer setting information corresponding to a signal-to-noise-per-domain-noise curve, which is confirmed through a crosstalk report, when the high-frequency band characteristic of the received crosstalk report is less than a reference; And the domain master applies the generated transmission equalizer setting information to the internal equalizer to generate a transmission signal.

The equalizer setting information generating step may further include generating equalizer setting information for the terminal corresponding to the size and the signal-to-noise curve of the received signal for each domain master, which is ascertained through the crosstalk report by the concentrator, Transmitting equalizer setting information for the terminal to the terminal; The UE may further include adjusting the size and band characteristics of a signal to be transmitted to the domain master by receiving the equalizer setting information for the UE.

The aggregating equipment further includes a step of collecting information on the distance between the domain master and the terminal. When the aggregating equipment generates the transmission equalizer setting information or the equalizer setting information for the terminal, the aggregating equipment calculates the average of the distance between the domain master and the terminal, And generating equalizer setting information based on one of the ranks.

The equalizer setting information generating step may refer to a plurality of equalizer setting information tables corresponding to the pattern of the signal-to-noise curve for each domain master.

The equalizer setting information generating step may generate equalizer setting information for providing an appropriate equalizer characteristic curve based on the minutiae of the signal-to-noise curve for each domain master.

The transmit equalizer may be a Continuous Time Linear Equalizer (CTLE).

Calculating current time information through a network time server connected to the concentrator; And performing synchronization with the terminal based on the calculated current time information of the concentrator.

The G.hn subscriber line aggregation equipment according to another embodiment of the present invention is a central office (CO) having a plurality of domain masters connected to a customer premises equipment (CPE) and a home line made up of bundles A CTR collection unit for collecting crosstalk reporting information for each domain master; An equalizer adjuster for generating transmit equalizer setup information corresponding to a signal-to-noise-per-domain-noise curve, which is confirmed through a crosstalk report when a predetermined high-frequency band characteristic is lower than a predetermined threshold in the collected crosstalk reporting information; And a domain master that generates a transmission signal amplified at a different amplification factor for each band according to the generated equalizer setting information.

The domain master may include an active equalizer for adjusting the amplification degree of the transmission signal by frequency in a curve form and an equalizer setting unit for changing the characteristic curve of the active equalizer according to the received equalizer setting information.

The equalizer control unit further generates the equalizer setting information for the terminal corresponding to the size and the signal-to-noise curve of the received signal per domain master, which is confirmed through the crosstalk report, and provides the same to the domain master. It is possible to transmit the equalizer setting information to the terminal.

The equalizer control unit may refer to a plurality of equalizer setting information tables corresponding to the pattern of the signal-to-noise curve for each domain master.

Alternatively, the equalizer adjuster may generate equalizer setting information to provide an appropriate equalizer characteristic curve based on the minutiae of the signal-to-noise curve for each domain master.

The aggregation equipment may further include a network time setting unit for connecting to an external time server connected to the network, confirming the correct time, and generating a synchronization signal at a predetermined cycle.

The adaptive equalizing method of the G.hn subscriber line network system according to the embodiment of the present invention and the concentrator using the same collects high frequency band crosstalk based on the crosstalk report of each domain master configured in the concentrator, It is possible to reduce the crosstalk caused by the signal attenuation in the high frequency band which is not resolved by the synchronization timing adjustment by adjusting the band-by-band signal including the high frequency band by resetting the equalizer setting value.

The adaptive equalizing method of the G.hn subscriber line network system according to the embodiment of the present invention and the aggregation equipment using the same can check the crosstalk state due to the operation of the adjacent domain master or the change of the G.hn communication use environment of the medium constituted by the bundle And the transmission equalizer setting value is applied differently according to the crosstalk state, it is possible to continuously and adaptively reduce the high frequency band crosstalk, thereby improving the performance of the G.hn subscriber line aggregation equipment, .

The adaptive equalizing method of the G.hn subscriber line network system according to the embodiment of the present invention and the concentrator using the aggregate equipment according to the embodiment of the present invention allow the aggregator to calculate the size and curve characteristic of the signal received by each domain master according to the distance between the domain master and the terminal, The equalizer setting value for each terminal is provided to the terminal through the domain master so that the terminal adjusts the signal size and the curve characteristic with the equalizer setting value, There is an effect of reducing crosstalk.

The adaptive equalizing method of the G.hn subscriber line network system according to an embodiment of the present invention and the concentrator using the equalizer apply a corresponding equalizer setting curve according to a signal-to-noise curve pattern for each domain master, It is possible to reduce the loss and improve the performance by extending the usable bandwidth.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram illustrating a general telephone line-based subscriber network. FIG.
FIG. 2 is a block diagram showing a configuration of a subscriber network employing G.hn technology. FIG.
FIG. 3 is a graph showing characteristics of each band when a telephone line is used as a medium of a subscriber network to which G.hn technology is applied.
4 is a block diagram of a G.hn subscriber line aggregation equipment according to an embodiment of the present invention and a system configuration using the same.
5 is a block diagram of a G.hn subscriber line aggregation equipment according to another embodiment of the present invention and a system configuration using the same.
FIG. 6 is a block diagram illustrating a configuration of a domain master according to an embodiment of the present invention; FIG.
7 is a conceptual diagram of an equalizer operation for explaining an embodiment of the present invention.
8 is a diagram illustrating an example of change in line characteristics before and after the application of an equalizer for explaining an embodiment of the present invention.
FIG. 9 is a conceptual diagram of an adaptive equalizer setting change for explaining an embodiment of the present invention. FIG.
10 is a flowchart showing an adaptive equalizing method of a G.hn subscriber line concentrator according to an embodiment of the present invention.
FIG. 11 and FIG. 12 are conceptual diagrams for explaining a transmission / reception equalizer setting concept according to an embodiment of the present invention; FIG.

It is noted that the technical terms used in the present invention are used only to describe specific embodiments and are not intended to limit the present invention. In addition, the technical terms used in the present invention should be construed in a sense generally understood by a person having ordinary skill in the art to which the present invention belongs, unless otherwise defined in the present invention, and an overly comprehensive It should not be construed as meaning or overly reduced. In addition, when a technical term used in the present invention is an erroneous technical term that does not accurately express the concept of the present invention, it should be understood that technical terms that can be understood by a person skilled in the art can be properly understood. In addition, the general terms used in the present invention should be interpreted according to a predefined or context, and should not be construed as being excessively reduced.

Furthermore, the singular expressions used in the present invention include plural expressions unless the context clearly dictates otherwise. The term "comprising" or "comprising" or the like in the present invention should not be construed as necessarily including the various elements or steps described in the invention, Or may include additional components or steps.

In addition, terms including ordinals such as first, second, etc. used in the present invention can be used to describe elements, but the elements should not be limited by terms. Terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or similar elements throughout the several views, and redundant description thereof will be omitted.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. It is to be noted that the accompanying drawings are only for the purpose of facilitating understanding of the present invention, and should not be construed as limiting the scope of the present invention with reference to the accompanying drawings.

Particularly, in explaining the present invention, a central office (CO), a port, and a customer premises equipment (CPE) are different from each other in terms of G.hn (G.hn Access Multiplexer ), Domain master (DM: Domain Master), and GNT (G.hn Network Terminal) / EP (End Pointer).

In addition, the G.fast (ITU-T G.9700, G.9701) technology which enables a higher-speed communication based on the G.hn technology also includes the configuration principle of the present invention applied to the G.hn technology configuration Can be applied as it is. That is, since the description based on the G.hn technology in the present invention can be applied to the subscriber network system based on the G.fast technology including the technical configuration as it is, the present invention can be applied to G.hn technology based on G.hn technology. The fast based subscriber line network also covers the scope of the invention.

FIG. 1 is a block diagram illustrating a general telephone line based subscriber line network, and illustrates an xDSL subscriber network as an example.

(CO: Central) having a switching device (packet switching device) 21 for connecting a plurality of ports 22 to an external network (a matro network, a backbone network, an Internet network, etc.) A customer premises equipment (CPE) 41 connected to each port 22 of the concentrator 20 and a terminal 41 connected to the concentrator 20, And a telephone line 31 to 33 for connection.

The home office 40 includes a hub 42 connected to the terminal 41 to enable connection of various data communication terminals (PC, set-top box, IPTV, etc.) Telephone service can be used as is.

In the case of such a general telephone line-based subscriber network, the concentrator 20 is mostly located on the network service operator side and the terminal 41 is located in the house.

Meanwhile, the conventional telephone line-based subscriber line uses a telephone line that has already been constructed with in-house wiring, and a telephone line connected to the concentrator 20 has dozens or hundreds of pairs of telephone line bundles. Particularly, in the case of a distribution network for distributing telephone lines to each household constructed in a building (apartment or building) 50, dozens of pairs of telephone lines are vertically arranged and horizontally branched for each household.

Although the existing xDSL-based subscriber network provides a transmission rate of about 200Mbps, it is not enough to cope with the recent high-quality high-definition multimedia service.

FIG. 2 is a block diagram illustrating a configuration of a subscriber network employing G.hn technology. FIG. 2 illustrates a configuration of a Giga wire approved as a domestic standard by accommodating the international standard (G.996x) will be.

In other words, unlike the existing collective equipments of the copper wire-based (telephone network, cable network) subscriber network are configured on the network service provider side, the aggregation equipment 100 is arranged in the premises of the collective building 50, The concentrator 100 and the network service provider are connected by an optical cable so that the existing copper wire medium can be used for high-speed communication at a short distance inside the building. For example, as a terminal structure of a FTTB (Fiber To The Building) subscriber network.

In the G.hn technology, each port of the concentrator 100 is referred to as a domain master (DM) 130, the terminal is referred to as an end point (EP) 46, G.hn domain. This is a term for distinguishing ports and terminals supporting G.hn technology, and refers to ports and terminals supporting G.hn technology in a comprehensive sense.

In addition, in the Giga wire which is recently approved as a domestic standard, the concentrator 100 is referred to as a G.hn Access Multiplexer (GAM) and the terminal is referred to as a GNT (G.hn Network Terminal) 45.

The illustrated concentrator 100 plays a role of G.hn's Global Master and controls the GAM Manager 110 that adjusts the settings of the domain master 130 to reduce the interference of each G.hn domain .

As shown in the example of the structure of a subscriber network employing the G.hn technology shown in the drawing, a copper line, for example, a telephone line 31, 32, 33, which is already constituted by existing domestic wiring lines, 30, the telephone lines 31, 32, 33 connected to the respective domain master 130 are physically adjacent to each other.

Accordingly, in order to reduce line-to-line crosstalk (in particular, front-end crosstalk) generated in the domain master 130, the timing of the transmission / reception signals is synchronized so that all the domain masters 130 transmit and receive simultaneously.

In particular, since one aggregation function may be physically composed of several concentrator 100 according to a service provision environment, an external synchronization clock is used in domestic standard and G.9961. 2, the concentrator 100 receives a synchronization signal from the external synchronous clock supplier 140 for synchronization of a transmission / reception signal between the domain master 130 and the terminal 46. As shown in FIG.

Since the timing of the transmission and reception is synchronized by using the synchronization signal, the shear crosstalk can be largely reduced. However, the deviation of the internal clock between the concentrators sharing the bundle substantially, the deviation of propagation delay between the ports, It is difficult to prevent perfect crosstalk due to timing deviation from different communication service provider equipment. In addition to these various factors, due to various environmental factors caused by activation / deactivation of the adjacent domain master by the increase / decrease of subscribers, Stability is fairly low.

In this environment, since a copper wire medium already installed as a subscriber network employing G.hn technology is used, a loss of a high frequency band is large due to characteristics of the copper wire medium, which is a problem in that G.hn subscription There is a problem of a high-frequency band crosstalk problem and a reduction in a used band of a magnetic net.

FIG. 3 is a graph showing characteristics of each band when a telephone line is used as a medium of a subscriber network to which the G.hn technology is applied. In FIG. 3, a graph of a PE insulated pair PVC sheathed city telephone (CPEV) ) Of the insertion loss (insertion loss).

As shown in the figure, the insertion loss increases as the frequency goes to the high frequency band, but the actual usable frequency band is limited to 150 MHz due to the rapid insertion loss increase after the 150 MHz band.

Also, since the insertion loss exceeds 40 dB at frequencies above 100 MHz in this usable band, the possibility of crosstalk between the adjacent lines in the high frequency band increases sharply in the unstable communication environment as described above.

Therefore, in the embodiment of the present invention, the attenuation of the signal generated in the high frequency band of the analog signal according to the G.hn technology is reduced, thereby reducing the high frequency band crosstalk occurring between adjacent lines.

FIG. 4 is a block diagram of a G.hn subscriber line aggregation equipment according to an embodiment of the present invention and a system configuration using the G.hn subscriber line aggregation equipment. In the example shown in FIG. 4, the example is applied to the Giga wire technology. However, the present invention is not limited thereto.

As shown, the concentrator 200 includes a domain master 230 corresponding to a port, a packet switching device 220, and a GAM Manager 210 corresponding to a G.hn global master. In addition, the synchronizing signal of the external synchronizing clock supplying unit 140 is used for synchronizing the transmitting and receiving signals according to the standard.

In general, the concentrator 200 can know the distance information between the individual domain master (port) 230 and the terminal 290, and has a function of checking the crosstalk occurrence state with respect to the individual domain master 230 (crosstalk reporting) . The crosstalk reporting includes signal-to-noise ratio (SNR) information of a signal received from each domain master 230, and it is possible to confirm the size of the signal, the characteristic pattern (curve) and the crosstalk state for each band.

In the embodiment of the present invention, a crosstalk report (CTR) collection unit 240 collects crosstalk reporting information for the individual domain master 230, and a crosstalk report And an equalizer adjusting unit 250 for generating transmission equalizer setting information or terminal equalizer setting information corresponding to a signal-to-noise-per-domain-master curve, which is confirmed through a crosstalk report, when the preset high-frequency band characteristic is less than a predetermined value .

At this time, the equalizer control unit 250 calculates equalizer setting information based on one or more of the average of the distance between the domain master and the terminal, the farthest distance, and the terminal priority in consideration of the distance information between the domain master 230 and the terminal 290 Can be generated. That is, when the distance between the domain master 230 and the terminal 290 is varied, a signal transmitted from the domain master 230 through the same transmission equalizer configuration has a difference in size and characteristics when reaching each terminal 290 The equalizer adjusting unit 250 generates the transmission equalizer setting information so as to obtain a characteristic curve corresponding to the appropriately set distance. In other words, the preset optimum size and characteristic curve for the selected distance are determined, and transmission equalizer setting information can be generated so as to obtain the size and the characteristic.

Meanwhile, the equalizer adjuster 250 may further generate the equalizer setting information for the terminal corresponding to the magnitude of the received signal and the signal-to-noise curve according to the domain master, which is confirmed through the crosstalk report. In order to prevent crosstalk from occurring due to different sizes and characteristic curves of the received signals arriving at the domain master 230, it is preferable to configure each terminal 290 such that the signal size and the characteristic curve at the reception timing of the domain master 230 are similar to each other The equalizer setting information to be provided to the equalizer setting unit 292 may be generated. In this case, the size and characteristics of an appropriate reception time point signal are determined based on at least one of the distance average, the longest distance, and the terminal priority in consideration of the distance information between the domain master 230 and the terminal 290, The equalizer configuration information for each terminal 290 may be generated so as to provide a size and a characteristic curve of each terminal 290.

That is, in order to prevent near-end crosstalk, the transmitter equalizer setting information and the equalizer setting information for the terminal may be generated so as to uniformly match the magnitude and characteristic curve of signals transmitted and received at the transmitting / receiving end of the domain master 230, And a reference size and characteristic curve of a desired signal according to the distance information).

 Meanwhile, the domain master 230 generates a transmission signal amplified at a different amplification rate for each band according to the transmission equalizer setting information generated by the equalizer adjusting unit 250, and transmits the amplified transmission signal to the terminal 290. The equalizer adjusting unit 250, And transmits the generated equalizer setting information to the terminal 290. [ The equalizer configuration information for the UE may be transmitted to the UE through an OAM (Operation, Administration & Maintenance) channel.

The configuration of the domain master 230 basically includes a baseband processing unit 231 and a physical layer processing unit 232 internally as shown in the example of FIG. The physical layer processor 232 basically includes an equalizer for adjusting the amplification degree of the transmission signal in a specific curve form. That is, the modulation performance of a high-frequency band having a low signal-to-noise ratio can be varied through a pre-emphasis configuration.

In the case of outputting a wide band signal, an equalizer that adjusts a transmission signal with different amplification degrees for different bands or a pre-emphasis circuit that makes a specific high frequency area to be modulated strongly is configured in accordance with the characteristics of the medium. However, .

Since the signal adjusted by the fixed equalizer or the pre-emphasis configuration can not cope with the complex and variable communication environment described above, the crosstalk due to the operation of the adjacent line domain master or the configuration of the adjacent equipment causes loss of high frequency band signal .

Therefore, the domain master 230 of the embodiment of the present invention includes an active equalizer 233 for adjusting the amplification degree of the transmission signal according to the frequency of the transmission signal in a curve form, and an active equalizer And an equalizer setting unit 234 for changing the characteristic curve of the input signal 233.

More preferably, the active equalizer 233 may be a Continuous Time Linear Equalizer (CTLE).

6, the terminal 290 according to the embodiment of the present invention includes a synchronization unit 291 for transmission / reception synchronization and an equalizer setting unit 290 for adjusting characteristics of signals to be transmitted to the domain master 230, And an active equalizer 293 is included in the equalizer setting unit 292. This active equalizer 293 may also be a continuous time linear equalizer. After receiving the equalizer setting information received from the domain master 230, the terminal 290 adjusts the transmission signal size and characteristics of each band through the equalizer setting unit 292, The size of the received signal and the characteristics of each band are uniform regardless of the distance deviation, and the near-end crosstalk caused by the difference in the signal size or the characteristic of each band can be reduced.

As described above, the concentrator 200 according to the embodiment of the present invention collects the crosstalk report of the communication process and judges that the crosstalk environment is changed when the preset crosstalk state of the high frequency band is the reference or more (when the line characteristic is below the reference) (Adaptive equalizer setting (adaptive pre-emphasis setting)) for generating setting information for changing transmission or terminal equalizer settings so as to reduce high-frequency band crosstalk of the corresponding domain master.

The equalizer control unit 250 divides the pattern of the signal-to-noise curve according to the crosstalk report of the domain master by a predetermined reference, and adjusts the equalizer setting for increasing the characteristics of the entire band including the high- Information can be provided in advance in the form of a table and the equalizer setting information suitable for the current state of the domain master can be selected based on the equalizer setting information table.

Alternatively, the illustrated equalizer adjuster 250 may check the characteristic points of the signal-to-noise curve according to the crosstalk report of the domain master (inclination, inflexion point, sub-reference characteristic point, etc.) The equalizer setting information may be generated.

Of course, a method of selecting basic equalizer setting information through the equalizer setting information table and fine-tuning the equalizer selected characteristic curve through the feature points of the signal-to-noise curve may be used in combination of these two methods.

At this time, the characteristic curve serving as a reference of the finally obtained equalized signal is determined based on a predetermined criterion according to the selected distance (average of distances, distance from the longest distance, distance to the higher priority terminal, etc.) The size and characteristic curve information of the desired signal along a certain distance may be determined at the time of manufacture).

FIG. 7 is a conceptual diagram of an equalizer operation for explaining an embodiment of the present invention. As shown in FIG. 7, a channel characteristic curve (double solid line) of a domain master is lowered toward a higher frequency as shown in FIG. 7, so that a subcarrier signal transmitted in a corresponding high frequency band is attenuated Line and crosstalk can occur. In this case, when the equalizer characteristic curve (dotted line) as shown in the figure is applied, it is possible to provide an output of a curve (solid line) as a result of improving the characteristics of the entire band including the high frequency band, Therefore, high frequency band crosstalk can be reduced.

FIG. 8 is a diagram illustrating changes in line characteristics before and after the application of the equalizer for explaining the embodiment of the present invention. As shown in FIG. 8, the actual channel characteristic signal indicated by the double solid line can not be used because the loss increases at 160 MHz or more, Even in the previous band, the loss is significant, indicating that there is a possibility of crosstalk. By applying the equalizer characteristic curve opposite to the characteristic, it can be seen that it is improved to the extent that it can be used up to about 180 MHz as shown by the solid line (increase of the usable bandwidth by 15%) and 10 dB of the improvement effect in the existing 160 MHz band . Thus, it is possible to improve the signal-to-noise ratio of the sub-carrier signal provided in the high-frequency band and to suppress the high-frequency band crosstalk.

FIG. 9 is a conceptual diagram of an adaptive equalizer setting change for explaining an embodiment of the present invention. The equalizer adjusting unit 250 according to an embodiment of the present invention calculates a domain master line characteristic curve c1 , c2, and c3) to generate the equalizer setting information to apply one of the appropriate equalizer characteristic curves E1, E2, and E3. Of course, different equalizer setting information may be generated for each domain master.

As illustrated, the equalizer characteristic curve E1 can be applied when the line characteristic of a predetermined domain master is equal to c1, and when the line characteristic of the domain master deteriorates as c2 due to the activation of the adjacent domain master or the addition of adjacent equipment, Curve E2 can be applied and the equalizer characteristic curve E3 can be applied when the line characteristics of the domain master are further degraded, such as c3, by additional activation of the adjacent domain master, addition of adjacent equipment, or increase of the used line.

Of course, when the slopes of the domain master line characteristic curves are different from each other, the shape of the equalizer characteristic curve may be configured to correspond to the curve. For example, the maximum point position of the illustrated curve may move left and right in the frequency domain, move up and down in the magnitude domain, and have a plurality of maximum points.

On the other hand, the improved result curve is a reference curve for the distance between the selected domain master and the terminal, and even if the line characteristic is changed according to the environment change, the result curves of all the domain masters have the same size and characteristic curve, So that shear crosstalk between signals does not occur.

11 and 12 are conceptual diagrams for explaining a concept of setting a transmitting and receiving equalizer according to an embodiment of the present invention.

As shown in FIG. 11A, when the domain master and the terminal have different distances, the transmission / reception signal characteristics of the case where the adaptive equalizing is not performed (only the fixed pre-emphasis circuit is applied) may be as shown in FIG. 11B.

As shown in the figure, the characteristics curve of the signal transmitted by the increase of the external crosstalk factor (adjacent domain master activation, neighboring third party equipment operation, etc.) synchronizes the transmission / reception time of each of the domain masters DM1 to DM3, And the received signal may have different size and characteristic curves, respectively, due to the influence of the external environment and distance. Particularly, in the case of the received signal, the magnitude and characteristics of the signal received from the terminal GNT2, which is distant from the magnitude and the characteristic of the signal received from the terminal GNT1 having a short distance, .

That is, in this case, crosstalk occurs in the high frequency band in the case of the transmission signal, and crosstalk occurs in the entire band in the case of the reception signal.

This processing is performed through the adaptive equalizer setting described above, so that the crosstalk can be reduced by uniformly maintaining the size and characteristic curve of the transmitting / receiving end signal of the domain master as shown in FIG.

12A, when the increase in the external crosstalk factor is detected, the transmit equalizer setting information generated to match the size and the characteristic curve of the transmitted signal to the set criterion (the size and the characteristic of the desired transmission signal according to the selected distance) And transmits the equalizer setting information generated for each terminal to each terminal in order to adjust the size and characteristic curve of the received signal to the set criterion (size and characteristic of the desired received signal according to the selected distance) And applies it to an active equalizer provided in each terminal.

In this case, as shown in FIG. 12B, it can be seen that both the signal size and the characteristic curve at the transmission time are uniform, and the signal size and characteristic curve at the reception time are also uniform.

As described above, the concentrator 200 shown in FIG. 4 can improve the performance by reducing the crosstalk in the high frequency band and expanding the used band by adaptively changing the degree of amplification of the output signal by each band according to the communication state.

Since the high frequency band crosstalk occurs more severely when the transmission and reception signals are not synchronized with each other, it is preferable to preferentially synchronize the transmission and reception signals. In addition to the proper synchronization process for the transmission and reception signals, It is effective to proceed with the reduction of crosstalk.

The concentrator 200 described with reference to FIG. 4 is configured according to a standard for synchronizing transmission and reception signals through an external synchronous clock supplier 140, but a separate synchronous clock supplier 140 for the concentrator needs to be separately provided. There is a limitation that the synchronous clock generator 140 must be physically connected to a plurality of concentrators for clock synchronization between a plurality of concentrators for coping with the same bundle cable situation. In addition, since the synchronous clock is applied only to the concentrator, the reference clock must also be transmitted to the in-house communication terminal 290 connected to the concentrator, so that the concentrator transmits the synchronous clock to the home communication terminal by including the synchronous clock in the transmission signal And there is an inconvenience that the home communication terminal must recover from such a transmission signal.

In addition, when a plurality of concentrators are physically applied to provide a collection function for a telephone line bundle, a synchronous clock must be physically transmitted between the concentrators, so that the compatibility of the interface for providing the synchronous clock must be maintained, Because of the same internal rules to use, it is necessary to use the equipment of the same manufacturer, and it is difficult to mix equipment having different physical interface or synchronous clock generation method. First of all, in a market situation where a plurality of communication service providers are mixed, when the same telephone line bundles are commonly used by the aggregation equipments of a plurality of communication service providers, it is difficult to use different synchronous clock generating units for each communication service provider and share them Synchronization between concentrators is not easy.

Accordingly, in another embodiment of the present invention, a structure for maintaining transmission / reception synchronization based on an accurate time is applied and profile information on a synchronization timing is shared, thereby reducing the dependence on a separate external sync clock providing unit, So that the problem of interface configuration for relaying can be solved.

FIG. 5 is a block diagram of a G.hn subscriber line aggregation equipment according to another embodiment of the present invention and a system configuration using the G.hn subscriber line aggregation equipment according to another embodiment of the present invention. The CTR collection unit 240, the equalizer adjustment unit 250, The configuration of the domain master 230 to be controlled in a similar manner is the same as that described with reference to FIG.

However, instead of receiving the synchronization signal for transmission / reception synchronization through the external synchronization clock providing unit 140, the network time setting unit 260 generates accurate time information and generates a synchronization signal based on the generated time information, .

The network time setting unit 260 refers to the time server 300 that can be accessed through the external network 10 to confirm the current correct time. For example, the current accurate time can be set using the IEEE 1588 Precision Timing Protocol (PTP). For the IEEE 1588 timing protocol, hardware-timed timestamps can be guaranteed to the nearest nanosecond accuracy.

In the case of the terminal 290, a network time setting unit that can confirm the current accurate time by referring to the external time server 300 is configured in the synchronization unit 291 so that the current time information of each individual terminal can be accurately measured And may be configured such that the synchronization unit 291 uses the concentrator 200 instead of the external time server 300 when necessary.

Accordingly, the aggregation device 200 and the terminal 290 can correctly grasp the current time information, respectively, so that accurate transmission and reception synchronization can be performed if only the information on the frame start time and the transmission / reception ratio is shared by the profile information. Such profile information may be generated by the concentrator 200 and provided to the terminal 290, and may be shared among other concentrators through a network connection.

In particular, since the occurrence of non-synchronized line-to-line crosstalk during the initial operation does not mean communication incapability, the terminal 290 accesses the time server 300 of the external network 10 through the configured subscriber network, And profile information can be shared, and then the transmission / reception can be synchronized based on the accurate current time.

When the concentrator 200 and the terminal 290 perform synchronization based on precise time, there is no need to configure a synchronous clock generator in each individual aggregated building or to receive an external synchronous clock in a physical line, Even when a plurality of concentrators 200 are used to perform the concentrator function, the wiring between the physical concentrator devices is not required and even when a synchronization error occurs, Can be minimized.

Even if the equipment of another communication service provider generates synchronization clock based on the current time, mutual synchronization can be achieved by sharing profile information through the network.

FIG. 10 is a flowchart showing an adaptive equalizing method of a G.hn subscriber line concentrator according to an embodiment of the present invention. Referring to FIG. 4 and FIG. 5, the CTR collecting unit 240, the equalizer adjusting unit 250, And corresponds to an example of a method of adaptively preventing crosstalk using the master 230.

First, the domain master and the terminal operate with the basic equalizer setting information in the initial operation to perform communication.

The CTR collection unit 240 receives the crosstalk report for each domain master in the course of communication. In this process, the distance information between the domain master and the terminal can be confirmed.

The equalizer adjuster 250 determines that the equalizer reset is necessary when the set signal characteristic of the received crosstalk report is below the reference value and repeats the process of receiving the crosstalk report during communication again when the equalizer reset is not necessary.

If equalizer resetting is required, the equalizer adjuster 250 generates transmit equalizer setup information or equalizer setup information corresponding to the signal-to-noise-per-domain-master noise curve, which is confirmed through the crosstalk report. At this time, based on the distance information between the domain master and the terminal, the criteria of the result characteristic curve to be obtained through equalization can be determined.

When the equalizer adjusting unit 250 generates the new equalizer setting information, the domain master 230 applies the equalizer setting information for the generated transmitting signal to the internal equalizer, and generates and transmits the transmitting signal based on the equalized setting information. Or transmits the generated equalizer configuration information to the UE, and the UE having received the equalizer configuration information for the UE applies the generated equalizer configuration information to the internal equalizer to generate a transmission signal, and provides the generated signal to the domain master.

This process is continuously repeated so that the equalizer can be adaptively reconfigured when the crosstalk state changes according to the change of the external communication environment.

This process can be performed not only for the transmission but also for the received signal in the same manner, and it is possible to improve the attenuation of the high frequency band signal of the received signal, but the application is limited in that it is a signal into which the noise is already inputted.

Although the embodiment has been described with reference to a telephone line, it is needless to say that crosstalk can be reduced in the same manner even when other types of domestic wiring including a coaxial cable and a power line are used as a medium.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or essential characteristics thereof. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

10: external network 47: terminal (GNT)
48: synchronization unit 200: aggregation equipment (GAM)
210: GAM Manager 220: Packet exchange device
230: domain master (port) 231: BB processing section
232: PHY processing unit 233: EQ unit
234: EQ setting unit 240: CTR collecting unit
250: Equalizer control unit 260: Network time setting unit
290: Terminal (GNT) 291:
292: EQ setting section 293: EQ section
300: Time server

Claims (13)

A monitoring step of receiving a crosstalk report for each domain master by a central office (CO) having a plurality of domain masters connected to a customer premises equipment (CPE) and an in-house line bundled;
An equalizer setting information generating step of generating transmission equalizer setting information corresponding to a signal-to-noise-per-domain-noise curve, which is confirmed through a crosstalk report, when the high-frequency band characteristic of the received crosstalk report is less than a reference;
And an equalizer resetting step wherein the domain master applies the generated transmit equalizer setting information to the internal equalizer to generate a transmit signal.
The method of claim 1, wherein the equalizer setting information generating step further includes generating equalizer setting information for a terminal corresponding to a signal-to-noise curve and a magnitude of a received signal for each domain master, which is ascertained through a crosstalk report,
The domain master transmitting the generated equalizer configuration information to the terminal;
The method of claim 1, further comprising the step of adjusting the size and band characteristics of signals to be transmitted to the domain master by the terminal after receiving the equalizer configuration information for the terminal.
The method of claim 2, wherein the aggregating equipment further comprises collecting information on a distance between a domain master and a terminal,
The aggregating equipment further comprises generating equalizer setting information based on one of an average of the distance between the domain master and the terminal, the farthest distance, and the terminal priority when generating the transmission equalizer setting information or the equalizer setting information for the terminal Of the G.hn subscriber line network.
The method of claim 1, wherein the step of generating the equalizer setting information refers to a plurality of equalizer setting information tables corresponding to a pattern of a signal-to-noise curve for each domain master.
The method as claimed in claim 1, wherein the equalizer setting information generating step generates equalizer setting information for providing an equalizer characteristic curve based on a minutiae of a signal-to-noise curve for each domain master, Way.
The adaptive equalizing method of claim 1, wherein the transmission equalizer is a continuous time linear equalizer (CTLE).
The method according to claim 1, further comprising: calculating current time information through a time server connected to the network by the concentrator;
And performing synchronization with the terminal based on the calculated current time information of the aggregation equipment.
A central office (CO) having a plurality of domain masters connected to a customer premises equipment (CPE) and a home line made up of bundles,
A CTR collection unit for collecting crosstalk reporting information by domain master;
An equalizer adjuster for generating transmit equalizer setup information corresponding to a signal-to-noise-per-domain-noise curve, which is confirmed through a crosstalk report when a predetermined high-frequency band characteristic is lower than a predetermined threshold in the collected crosstalk reporting information;
And a domain master for generating a transmission signal amplified at a different amplification factor for each band according to the generated equalizer setting information.
[8] The method of claim 8, wherein the domain master comprises an active equalizer for adjusting the amplification degree of the transmission signal according to frequency in a curve form, and an equalizer setting unit for changing the characteristic curve of the active equalizer according to the received equalizer setting information G.hn aggregation equipment using adaptive equalization method.
The method as claimed in claim 8, wherein the equalizer control unit further generates the equalizer setting information for the terminal corresponding to the size and the signal-to-noise curve of the received signal for each domain master, which is confirmed through the crosstalk report,
And the domain master transmits the equalizer setting information generated by the equalizer adjusting unit to the mobile station.
9. The G.hn concentrator according to claim 8, wherein the equalizer controller refers to a plurality of equalizer setting information tables corresponding to a pattern of a signal-to-noise curve for each domain master.
9. The G.hn concentrator according to claim 8, wherein the equalizer adjuster generates equalizer setting information for providing an equalizer characteristic curve based on a minutiae of a signal-to-noise curve for each domain master.
9. The system of claim 8, wherein the aggregation equipment further comprises a network time setting unit for connecting to an external time server connected to the network and generating a synchronization signal at a predetermined period after confirming an accurate time, Collective equipment.

Images