CN105827276A - Crosstalk cancellation realization method and local terminal access device - Google Patents

Abstract

The embodiment of the invention discloses a method for realizing crosstalk cancellation and central office access equipment, which are used to realize line crosstalk cancellation and reduce power consumption. The method in the embodiment of the present invention includes: obtaining the current subframe in the time-domain converted TDD frame on each line; obtaining the target control information of the current subframe according to the position number of the current subframe in the corresponding TDD frame, and The target control information is any one of first control information, second control information, and third control information, the first control information points to the first type of crosstalk cancellation operation, and the second control information points to the second type of crosstalk Cancellation operation, the third control information points to a third type of crosstalk cancellation operation, the first type of crosstalk cancellation operation, the second type of crosstalk cancellation operation, and the third type of crosstalk cancellation operation are different; execute on the current subframe The crosstalk cancellation operation pointed to by the target control information.

Description

A method for implementing crosstalk cancellation and central office access equipment

technical field

The invention relates to the field of communication technology, in particular to a crosstalk cancellation implementation method and central office access equipment.

Background technique

In order to adapt to the new situation and needs, a variety of broadband access network technologies have emerged. From the perspective of transmission media, it can be divided into various wired access technologies such as copper wire access technology, optical fiber access technology, hybrid optical fiber coaxial access technology, and wireless access technology. Among them, copper wire access technology is more widely used. broad technology. Traditional copper wire access technology only provides data services at a limited access rate. With the increasing growth of data services, the access rate has experienced 8M asymmetrical digital subscriber line (ADSL) technology, 100M ultra-high-speed Digital subscriber line (Very High Speed Digital Subscriber Line, referred to as VDSL) technology, and even Vectoring (vectoring) technology, wherein, Vectoring technology is an added technology of VDSL2, which cancels crosstalk through the superposition of vector matrix.

G.Fast technology is a copper wire access technology emerging in recent years, and shoulders the important task of realizing gigabit access. At present, G.Fast technology using Vectoring (vectorization) crosstalk cancellation method has entered the commercial stage, adopting the specification of full cancellation to achieve higher performance and optimize the access rate. In the Vectoring (vectorization) crosstalk cancellation method, the crosstalk cancellation operation is performed on each line, and the crosstalk cancellation coefficient of each line needs to be stored in the system. Since different subframes on each line use different crosstalk cancellation coefficients, it will consume Lots of memory. And in practical applications, in some time domains, subframes on some lines do not carry data information, but according to the above-mentioned Vectoring method, all lines are still processed according to the crosstalk cancellation operation mode carrying data information, resulting in a large amount of power consumption consume.

Contents of the invention

Embodiments of the present invention provide a crosstalk cancellation implementation method and central office access equipment, which are used to solve the problem of high power consumption in the prior art.

The first aspect of the present invention provides a method for realizing crosstalk cancellation, which is applied to the central office access device. The central office access device is connected to several remote access devices, and the central office access device is connected to each remote Incoming devices are connected through a line, the method includes:

The above-mentioned central office access device obtains the current subframe in the time-domain converted TDD frame on each line, and each line uses TDD frames for data transmission, and the TDD frames of all lines are transmitted synchronously, and the TDD frames of each line include M subframes, the above M is a positive integer;

The central office access device obtains the target control information of the current subframe according to the position number of the current subframe in the corresponding TDD frame, and the target control information is included in the first control information, the second control information and the third control information Any one of the above-mentioned first control information points to the first type of crosstalk cancellation operation, the above-mentioned second control information points to the second type of crosstalk cancellation operation, the above-mentioned third control information points to the third type of crosstalk cancellation operation, and the above-mentioned first type of crosstalk cancellation operation operation, the second crosstalk cancellation operation, and the third crosstalk cancellation operation are different;

The central office access device performs the crosstalk cancellation operation pointed to by the target control information on the current subframe.

It can be seen that in the embodiment of the present invention, when the central office access device performs the crosstalk cancellation processing of each line, it first obtains the current subframe on the TDD frame in each line, and then according to the position in the current subframe sub-TDD frame serial number to obtain the corresponding target control information. Since the target control information is any one of the first control information, the second control information and the third control information, the first control information points to the first type of crosstalk cancellation operation, and the second control information points to the second type of crosstalk cancellation operation , the third control information points to the third crosstalk cancellation operation, that is to say, one of the three crosstalk cancellation operations is applied to the current subframe, so that the targeted crosstalk cancellation operation is performed on the subframe to simplify the crosstalk offset operation to reduce power consumption.

Optionally, in some embodiments of the present invention, before the access device at the central office obtains the current subframe of the TDD frame on the line, it first performs control information setting, and performs the control information setting for each subframe in the TDD frame of each line The control information is set to implement crosstalk cancellation based on the subframe dimension.

Further, in some embodiments of the present invention, when the central office access device sets the control information of each subframe of the TDD frame on each line, the setting method is specifically determined in conjunction with the Nth subframe of all lines, specifically including The following three setting methods: the first method, if the Nth subframe of the TDD frame on all lines is an uplink subframe or downlink subframe, then the central office access device is the Nth subframe of the TDD frame on each line The first control information is set in each subframe; the second method, if the Nth subframe of the TDD frame of at least one line in all lines is an idle subframe, and the Nth subframe of the TDD frame of other lines is an uplink subframe or downlink subframe, then the central office access device sets the second control information for the Nth subframe of the TDD frame of other lines, and sets the third control information for the line whose Nth subframe is an idle subframe; the third way , if the Nth subframes of the TDD frames of all lines are idle subframes, then the central office access device is configured to set the third control information for the Nth subframes of the TDD frames on each line. Wherein, the above-mentioned N is a positive integer greater than or equal to 1 and less than or equal to M. It can be seen that in this embodiment, the TDD of the line is set in combination with the three cases that the subframes at the same position on the TDD of all lines are not idle subframes, some are idle subframes, and all are idle subframes. The control information of sub-frames can fit the actual application scenario and effectively realize crosstalk cancellation.

Optionally, in some embodiments of the present invention, the central office access device obtains the target control information of the current subframe according to the position number of the current subframe in the corresponding TDD frame, specifically: the central office access device obtains the target control information of the current subframe according to the The target control information of the current subframe is obtained from the corresponding coefficient selection table corresponding to the position number in the TDD frame, one coefficient selection table corresponds to one line, and the coefficient selection table includes M pieces of control information. It can be seen that in the embodiment of the present invention, the control information of all subframes on the TDD of a line is sequentially placed in the coefficient selection table, and the central office access device can correspondingly select from The control information is quickly read from the coefficient selection table.

Optionally, in some embodiments of the present invention, the coefficient selection table can be stored in a ping-pong buffer mode. According to the reading mode of the ping-pong buffer, after reading the control information of the previous subframe, the next subframe can be quickly read. Subframe control information.

Optionally, in some embodiments of the present invention, the above-mentioned first crosstalk cancellation operation is to read the first crosstalk cancellation coefficient, the above-mentioned second crosstalk cancellation operation is to read the second crosstalk cancellation coefficient, and the above-mentioned third crosstalk cancellation The operation is not to perform the crosstalk cancellation operation.

Optionally, in some embodiments of the present invention, the crosstalk cancellation operation directed by the target control information to be performed by the central office access device on the current subframe is also divided into the following three cases: Case 1: If the target control information is the first control Information, the central office access device reads the first crosstalk cancellation coefficient, and performs crosstalk cancellation operation on the current subframe according to the first crosstalk cancellation coefficient; Case 2: If the target control information is the second control information, the central office access device reads The second crosstalk cancellation coefficient, performing a crosstalk cancellation operation on the current subframe according to the second crosstalk cancellation coefficient; Case 3: If the target control information is the third control information, the central office access device does not need to perform crosstalk on the current subframe Offset operation.

The second aspect of the present invention provides a central office access device, the central office access device is connected to several remote access devices, and a line is used between the central office access device and each remote access device connection, the central office access equipment includes:

The subframe acquisition module is used to acquire the current subframe in the time-domain conversion TDD frame on each line, each line uses TDD frame for data transmission, and the TDD frames of all lines are transmitted synchronously, and the TDD frame of each line includes M subframes, where M is a positive integer;

An information acquisition module, configured to acquire target control information of the current subframe according to the position number of the current subframe in the corresponding TDD frame, where the target control information is the first control information, the second control information and the third control information. Any one of the control information, the first control information points to a first type of crosstalk cancellation operation, the second control information points to a second type of crosstalk cancellation operation, and the third control information points to a third type of crosstalk cancellation operation, The first crosstalk cancellation operation, the second crosstalk cancellation operation and the third crosstalk cancellation operation are different;

A crosstalk processing module, configured to perform a crosstalk cancellation operation pointed to by the target control information on the current subframe.

It can be seen that when the central office access device in the embodiment of the present invention performs crosstalk cancellation processing for each line, the subframe acquisition module first acquires the current subframe on the TDD frame in each line, and then the information acquisition module obtains the current subframe on the TDD frame according to the current subframe The position number in the sub-TDD frame of the frame is used to obtain the corresponding target control information. Since the target control information is any one of the first control information, the second control information and the third control information, the first control information points to the first type of crosstalk cancellation operation, and the second control information points to the second type of crosstalk cancellation operation , the third control information points to the third crosstalk cancellation operation, that is to say, one of the three crosstalk cancellation operations is applied to the current subframe, so that the crosstalk processing module can perform targeted crosstalk cancellation on the subframe operation, simplifying crosstalk cancellation operations to reduce power consumption.

Optionally, in some embodiments of the present invention, the access device at the central office further includes: a setting module, configured to set the control information corresponding to each subframe in the TDD frame on each line.

Optionally, in some embodiments of the present invention, the above-mentioned setting module is specifically configured to obtain the Nth subframes of TDD frames on all lines, and the above-mentioned M subframes include at least one of uplink subframes, downlink subframes and idle subframes One, the above-mentioned N is a positive integer greater than or equal to 1 and less than or equal to the above-mentioned M; if the Nth subframe of the TDD frame on all lines is an uplink subframe or a downlink subframe, the above-mentioned setting module is for each line Set the first control information in the Nth subframe of the TDD frame above; if the Nth subframe of the TDD frame of at least one line in all lines is an idle subframe, the TDD frame of other lines except the above-mentioned at least one line in all lines The Nth subframe of the above-mentioned line is an uplink subframe or a downlink subframe, the second control information is set for the Nth subframe of the TDD frame of the above-mentioned other line, and the third control information is set for the Nth subframe of the TDD frame of the above-mentioned at least one line ; If the Nth subframes of the TDD frames of all lines are idle subframes, set the third control information above for the Nth subframes of the TDD frames on each line.

Optionally, in some embodiments of the present invention, the above-mentioned information obtaining module is specifically configured to obtain the target control information of the above-mentioned current subframe from the corresponding coefficient selection table according to the position number of the above-mentioned current subframe in the corresponding TDD frame , one coefficient selection table corresponds to one line, and the coefficient selection table includes M pieces of control information.

Optionally, in some embodiments of the present invention, the control information in the coefficient selection table is stored in a ping-pong buffer manner.

Optionally, in some embodiments of the present invention, the above-mentioned first crosstalk cancellation operation is to read the first crosstalk cancellation coefficient, the above-mentioned second crosstalk cancellation operation is to read the second crosstalk cancellation coefficient, and the above-mentioned third crosstalk cancellation The operation is not to perform the crosstalk cancellation operation.

Optionally, in some embodiments of the present invention, the above-mentioned crosstalk processing module is specifically configured to, if the above-mentioned target control information is the above-mentioned first control information, read a first crosstalk cancellation coefficient, and calculate the above-mentioned current Perform a crosstalk cancellation operation on the subframe; if the above-mentioned target control information is the above-mentioned second control information, read the second crosstalk cancellation coefficient, and perform a crosstalk cancellation operation on the above-mentioned current subframe according to the above-mentioned second crosstalk cancellation coefficient; if the above-mentioned target control information is The third control information does not need to perform a crosstalk cancellation operation on the current subframe.

The third aspect of the present invention provides a system for implementing crosstalk cancellation, which may include: a central office access device and several remote access devices; wherein, the central office access device is the central office provided in the second aspect Access the device.

The fourth aspect of the present invention provides a central office access device, the central office access device is connected to several remote access devices, and the central office access device is connected to each remote access device through a line The central office access device includes a baseband processor and a vectoring processor, the baseband processor is connected to the above-mentioned plurality of remote access devices, and the vectoring processor is used to execute the steps provided in the first aspect.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required in the embodiments of the present invention. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

FIG. 1 is a schematic diagram of an access network network architecture provided by an embodiment of the present invention;

FIG. 2a is a schematic structural diagram of a TDD frame provided by an embodiment of the present invention;

2b-2d are schematic structural diagrams of a TDD frame in a line provided by an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a CST table provided by an embodiment of the present invention;

FIG. 4 is a schematic flowchart of a method for implementing crosstalk cancellation provided by an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a central office access device provided by an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a system for implementing crosstalk cancellation provided by an embodiment of the present invention;

FIG. 7 is another schematic structural diagram of the central office access device provided by the embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

The embodiment of the present invention provides a method for realizing crosstalk cancellation, which is used to realize crosstalk cancellation of lines, reduce power consumption, and improve system performance. The embodiment of the present invention also provides a central office access device corresponding to the implementation method of crosstalk cancellation.

Please refer to FIG. 1 . FIG. 1 is a schematic diagram of an access network architecture provided by an embodiment of the present invention. Figure 1 includes one central office access device and two remote access devices, wherein the central office access device is connected to the remote access device through a copper wire (of course, the central office access device can be connected to several remote access devices. In FIG. 1, only two remote access devices are used for illustration), so that a line is formed between the central office access device and the remote access device. The central office access device is also connected to the regional network to realize network access. The remote access device is connected to the access node and may be a terminal device such as a telephone or a computer.

In Figure 1, the copper wires are connected using G.Fast technology. Since the access device at the central office is connected to several remote access devices, the access device at the central office corresponds to multiple lines. There will be crosstalk, which requires the central office access device to perform crosstalk cancellation operations on each line. The general method of Vectoring (vectorization) crosstalk elimination method introduced by G.Fast technology is to adopt the full cancellation method. The so-called full cancellation method refers to performing crosstalk cancellation processing on all subframes on the line, and different subframes on the same line With different cancellation coefficients, this will result in a large power consumption. The implementation method of crosstalk cancellation provided by the embodiment of the present invention can realize targeted crosstalk cancellation operation and reduce power consumption. Before introducing the implementation method of crosstalk cancellation provided by the embodiment of the present invention, briefly introduce several noun concepts defined in the G.Fast standard, including: Time-DivisionDuplexing (TDD for short) frame, continuous operation area ( NormalOperationInterval, referred to as NOI) and discontinuous operation area (DiscontinuousOperationInterval, referred to as DOI).

Please refer to FIG. 2a. FIG. 2a is a schematic structural diagram of a TDD frame provided by an embodiment of the present invention. As shown in FIG. 2a, a TDD frame defined in the G.Fast standard has a maximum of 36 symbols (symbols) (36 symbols are taken as an example in FIG. 2a). Wherein, a symbol is also a subframe, which is collectively referred to as a subframe subsequently. Uplink subframes, downlink subframes, and idle subframes are also defined in 36 subframes. Uplink data is transmitted on uplink subframes, and downlink data is transmitted on downlink subframes. No data will be transmitted on idle subframes, and different uplink and downlink time ratios are supported in TDD frames. The uplink and downlink time ratio can be adjusted according to different service types to meet the asymmetric uplink and downlink business requirements. Frames 0-24 are always downlink subframes, 25-26 are idle subframes (no data is always transmitted), and 27-35 are always uplink subframes.

Based on the above definition of the TDD frame, in the multiple lines corresponding to a central office access device, the TDD frame in each line can be adaptively set for uplink and downlink time ratio settings and idle subframe settings, and also That is to say, the ratios of uplink subframes, downlink subframes and idle subframes in the TDD frame of each line may be completely the same, completely different, or partly different. In the embodiment of the present invention, the uplink and downlink subframes can be regarded as a whole without considering the uplink and downlink time configuration, and only the uplink and downlink subframes with data transmission and the idle subframes without data transmission are considered. Assuming that the central office access device corresponds to 4 lines as an example, please refer to FIGS. 2b-2d, which are schematic structural diagrams of TDD frames in the lines provided by the embodiment of the present invention. In Figure 2b, the TDD frame structures of the four lines are the same, among which, the first 8 subframes (0-7) of the 36 subframes are used to transmit data (it is not necessary to consider which of the 8 subframes are uplink subframes here, which are downlink subframes), and the remaining subframes are idle subframes. In Fig. 2c, the first 4 (0-3) subframes of the first line are used to transmit data, and the remaining subframes are idle subframes. The first 8 (0-7) subframes of the 2nd, 3rd and 4th lines are used to transmit data, and the remaining subframes are idle subframes. In Fig. 2d, the first 4 subframes and the 34th subframe of the first line are used for data transmission, and other subframes are idle subframes. In the 2nd, 3rd and 4th lines, the first 5 subframes, the 7th, 8th, 11th, and 13th subframes are used to transmit data, and the remaining subframes are idle subframes.

After configuring the uplink and downlink subframes and idle subframes for the TDD frame in each line, the line will transmit data based on the format of the configured TDD frame until the next time the TDD frame is reconfigured. Taking the time of transmitting a TDD frame as a cycle, the cycle of transmitting TDD frames on each line is the same, and the TDD frames on each line are completely aligned in the time domain, for example, in the same time domain, each line corresponds to are all subframes with the same position number.

It should be noted that each line will transmit TDD frames at its own cycle. At this time, the uplink and downlink subframes in the TDD frame may actually carry data or may not carry data. If the uplink and downlink subframes used for data transmission are configured When the frame does not carry data, the subframe is considered as empty.

Further, in combination with the configuration of uplink and downlink subframes and idle subframes in TDD on each line, take Figure 2b and Figure 2d as examples, in Figure 2b, the first 8 subframes of the 4 lines are all configured to transmit The subframe of the data, therefore, the length region of the first 8 subframes in each line is regarded as the NOI. In Figure 2c, the first 6 subframes of the 4 lines are configured as subframes for data transmission, therefore, the length of the first 6 subframes on each line is regarded as the NOI, and because the first line No data is transmitted in the 7th and 8th subframes, but the 7th and 8th subframes in the 2nd, 3rd and 4th lines transmit data, so the 7th and 8th subframes in the 4 lines are divided into two The subframe length is regarded as DOI. In Figure 2d, data is transmitted in the first 4 subframes of the 4 lines, so this length area of the first 4 subframes in the 4 lines is regarded as the NOI, and since the 5th subframe in the 1st line No data is transmitted until the 12th subframe. Therefore, the length of the 5th to 12th subframes in the 4 lines is regarded as the DOI, and the 13th subframe in the 4 lines transmits data. Therefore, the 4 lines The 13th subframe in the line is regarded as NOI. Generally speaking, when the number of subframes included in the TDD frames in all lines is the same, and the TDD frames in all lines are transmitted synchronously (that is, in the same time domain as described above, each line has The subframes that transmit the same position number), NOI means that the subframes corresponding to the same position number of the TDD frame of all lines are subframes that transmit data, such as uplink subframes or downlink subframes, DOI means that all lines TDD subframes on at least one line are idle subframes.

According to the NOI and DOI defined by G.Fast, it can be known that in the application scenario of NOI, since the subframes on all lines are uplink subframes or downlink subframes, which can be used to transmit data, therefore, crosstalk needs to be performed on all lines separately In the cancellation operation, the crosstalk cancellation coefficient used to implement the crosstalk cancellation operation is the same, which is called the crosstalk cancellation coefficient of the NOI. In the DOI application scenario, since some subframes on the lines are not used for data transmission, they are idle subframes, then the lines with idle subframes do not need to perform crosstalk cancellation operations, and because the lines that need to perform crosstalk cancellation operations The number will also be reduced, and the crosstalk cancellation coefficient used for the crosstalk cancellation operation should be different from the crosstalk cancellation coefficient in the NOI, which is called the crosstalk cancellation coefficient of the DOI. If the subframes at the same position number in all lines are idle subframes (the last 28 subframes in FIG. 2b ), the crosstalk cancellation operation may not be performed. Therefore, in the embodiment of the present invention, corresponding to the NOI application scenario, the crosstalk cancellation coefficient of NOI is defined, and corresponding to the DOI application scenario, the crosstalk cancellation coefficient of DOI is defined, corresponding to the subframes on the same position number in all lines as idle During the subframe, it is determined that no crosstalk cancellation operation is performed.

Among them, since all the lines in the NOI use the crosstalk cancellation coefficient of the NOI, the lines used to transmit data in the subframes in the DOI use the crosstalk cancellation coefficient of the DOI, and the lines in other subframes that are idle subframes do not need to perform crosstalk cancellation. Therefore, in the embodiment of the present invention, only two coefficients, the crosstalk cancellation coefficient of the NOI and the crosstalk cancellation coefficient of the DOI, need to be stored.

It can be seen from the above introduction that the crosstalk cancellation operation only needs to consider the configuration of uplink and downlink subframes and idle subframes in the TDD frame, and does not need to consider whether the subframes carry data in actual transmission. Therefore, in the embodiment of the present invention, the crosstalk cancellation coefficient for each subframe in the TDD frame of each line may be determined in advance by combining the formats of the TDD frames in all lines. As shown in Figure 3, a coefficient selection table (Coefficient selecttable, referred to as CST) table with a depth of 36 degrees is set for a TDD frame. The CST table includes 36 CST entries, and each CST entry includes control information, wherein, The control information indicates specific crosstalk cancellation operations. For the three situations of NOI, DOI and no need to perform crosstalk cancellation processing, three crosstalk cancellation operations are set, which are the first crosstalk cancellation operation, the second crosstalk cancellation operation and the third crosstalk cancellation operation. Similarly, the control The information is divided into three types, the first control information, the second control information and the third control information. The first control information points to the first type of crosstalk cancellation operation, the second control information points to the second type of crosstalk cancellation operation, and the third control information points to The third kind of interference cancellation operation. Further, the first crosstalk cancellation operation refers to reading the crosstalk cancellation coefficient of the NOI, the second crosstalk cancellation operation refers to reading the crosstalk cancellation coefficient of the DOI, and the third crosstalk cancellation operation refers to not performing crosstalk cancellation processing.

In the embodiment of the present invention, two buffer areas are set, respectively defined as buffer area A (ping_buffer) and buffer area B (pong_buffer), wherein, buffer area A is used to store the crosstalk cancellation coefficient of NOI, and buffer area B is used to store DOI The crosstalk cancellation coefficient of .

Furthermore, for the two cases of NOI and DOI, some bits can be set in the CST entry to store control information. Please refer to Figure 3, for example, 2 bits are designed in each CST entry, wherein, if the value of 2bit is [0,0] means the first type of crosstalk cancellation operation, which is to read the crosstalk cancellation coefficient of NOI, and if it is [0.1], it means the second type of crosstalk cancellation operation, that is, to read the crosstalk cancellation coefficient of DOI, If it is [1,1], it means that the third crosstalk cancellation operation does not need to perform crosstalk cancellation processing.

In order to realize two kinds of crosstalk processing operations corresponding to NOI and DOI, the CST table corresponding to each TDD may be stored in a ping-pong buffer manner.

In combination with the above introduction, the implementation method of crosstalk cancellation provided by the embodiment of the present invention, as shown in FIG. 4, may include:

401. The central office access device obtains the current subframe in the time-domain converted TDD frame on each line, and each line uses TDD frames for data transmission, and the TDD frames of all lines are transmitted synchronously, and the TDD frames of each line include M subframes, where M is a positive integer;

402. The central office access device acquires target control information of the current subframe according to the position number of the current subframe in the corresponding TDD frame, and the target control information is first control information and second control information and any one of the third control information, the first control information points to the first type of crosstalk cancellation operation, the second control information points to the second type of crosstalk cancellation operation, and the third control information points to the third type of crosstalk Cancellation operations, the first crosstalk cancellation operation, the second crosstalk cancellation operation and the third crosstalk cancellation operation are different;

403. The central office access device performs the crosstalk cancellation operation pointed to by the target control information on the current subframe.

It can be understood that when the central office access device performs crosstalk cancellation processing, it performs parallel processing on all lines. Since the control information of each subframe has been set, the central office access device determines that it is a new TDD frame by detecting the frame header of the TDD frame, and then detects the frame header of a subframe to determine this The subframe is the first frame of the TDD frame. It is counted by a register. The value of the register is set to 1. First, go to the CST table corresponding to the TDD frame to read the control information corresponding to the first subframe. If it is the first control information or The second control information reads the corresponding crosstalk cancellation coefficient, and then uses the crosstalk cancellation coefficient to perform crosstalk cancellation processing on the current subframe.

In conjunction with the above-mentioned FIG. 2b, for the first subframe of TDD on line 1, the crosstalk cancellation coefficient of NOI should be used. Therefore, the crosstalk cancellation coefficient of NOI is read from the buffer area A, and then the crosstalk cancellation process is performed. Among them, the crosstalk cancellation processing is divided into two cases: if there is data to be transmitted, the data to be transmitted corresponding to the first subframe is obtained, and then the data to be transmitted and the crosstalk cancellation coefficient of the NOI are matrix multiplied to obtain the data after crosstalk cancellation , and then map the data after crosstalk cancellation to the first subframe for transmission; obtain the data received through the first subframe, and then perform matrix multiplication on the received data and the crosstalk cancellation coefficient of NOI to obtain the original crosstalk cancellation data.

Please refer to FIG. 5. FIG. 5 is a schematic structural diagram of a central office access device provided by an embodiment of the present invention; as shown in FIG. 5 and in combination with FIG. 1, the central office access device is connected to several remote access devices, and The central office access device is connected to each remote access device through a line, and a central office access device 500 may include:

The subframe obtaining module 510 is used to obtain the current subframe in the time-domain converted TDD frame on each line, each line carries out data transmission with a TDD frame, and the TDD frames of all lines are transmitted synchronously, and the TDD frames of each line are Including M subframes, where M is a positive integer;

An information acquisition module 520, configured to acquire target control information of the current subframe according to the position number of the current subframe in the corresponding TDD frame, where the target control information is the first control information, the second control information, and the second control information. Any one of the three control information, the first control information points to the first type of crosstalk cancellation operation, the second control information points to the second type of crosstalk cancellation operation, and the third control information points to the third type of crosstalk cancellation operation , the first crosstalk cancellation operation, the second crosstalk cancellation operation and the third crosstalk cancellation operation are different;

A crosstalk processing module 530, configured to perform a crosstalk cancellation operation pointed to by the target control information on the current subframe.

It can be seen that, in the embodiment of the present invention, when the central office access device performs crosstalk cancellation processing for each line, the subframe acquisition module 510 first acquires the current subframe on the TDD frame in each line, and then the information acquisition module 520 according to The position number in the sub-TDD frame of the current sub-frame is used to obtain the corresponding target control information. Since the target control information is any one of the first control information, the second control information and the third control information, the first control information points to the first type of crosstalk cancellation operation, and the second control information points to the second type of crosstalk cancellation operation , the third control information points to the third crosstalk cancellation operation, that is to say, one of the three crosstalk cancellation operations is applied to the current subframe, so that the crosstalk processing module 530 can perform targeted crosstalk on the subframe Cancellation operation simplifies crosstalk cancellation operation to reduce power consumption.

In some embodiments of the present invention, the central office access device 500 further includes a setting module 540, wherein the setting module is configured to set the control information corresponding to each subframe in the TDD frame on each line.

Optionally, in some embodiments of the present invention, the setting module 540 is specifically configured to obtain the Nth subframe of the TDD frame on all lines, and the M subframes include uplink subframes, downlink subframes and idle subframes At least one, the N is a positive integer greater than or equal to 1 and less than or equal to the M; if the Nth subframe of the TDD frame on all lines is an uplink subframe or a downlink subframe, the setting module 540 Set the first control information for the Nth subframe of the TDD frame on each line; if the Nth subframe of the TDD frame of at least one line in all lines is an idle subframe, remove the at least one line from all lines The Nth subframe of the TDD frame of other lines is an uplink subframe or a downlink subframe, the second control information is set for the Nth subframe of the TDD frame of the other line, and the second control information is set for the TDD frame of the at least one line Set the third control information for N subframes; if the Nth subframes of the TDD frames of all lines are idle subframes, set the third control information for the Nth subframes of the TDD frames on each line.

Optionally, in some embodiments of the present invention, the above-mentioned information obtaining module 520 is specifically configured to, according to the position number of the current subframe in the corresponding TDD frame, obtain the coefficient selection table of the current subframe from the corresponding coefficient selection table. For target control information, one coefficient selection table corresponds to one line, and the coefficient selection table includes M pieces of control information.

Optionally, in some embodiments of the present invention, the above-mentioned crosstalk processing module 530 is specifically configured to, if the target control information is the first control information, read a first crosstalk cancellation coefficient, and according to the first crosstalk cancellation coefficient Perform a crosstalk cancellation operation on the current subframe; if the target control information is the second control information, read a second crosstalk cancellation coefficient, and perform crosstalk on the current subframe according to the second crosstalk cancellation coefficient Cancellation operation: if the target control information is the third control information, no crosstalk cancellation operation is performed on the current subframe.

Optionally, the control information of the coefficient selection table provided by the embodiment of the present invention is stored in a ping-pong buffer manner.

Optionally, the first crosstalk cancellation operation provided by the embodiment of the present invention is to read the first crosstalk cancellation coefficient, the second crosstalk cancellation operation is to read the second crosstalk cancellation coefficient, and the third crosstalk cancellation operation is not to perform crosstalk Offset operation.

Please refer to FIG. 6. FIG. 6 is a schematic structural diagram of a crosstalk cancellation implementation system provided by an embodiment of the present invention; as shown in FIG. 6, a crosstalk cancellation implementation system 600 may include:

The central office access device 500 and at least one remote access device 610 shown in FIG. 5 .

Wherein, for the access device 500 at the central office, please refer to the introduction of the method embodiment and the embodiment in FIG. 5 , which will not be repeated here.

Please refer to FIG. 7. FIG. 7 is another structural schematic diagram of the central office access device provided by the embodiment of the present invention, wherein the central office access device 700 may include at least one baseband processor 701 and at least one vectorization processor 702 , at least one network interface or other communication interfaces, the memory 703, and at least one communication bus, are used to realize connection and communication between these devices. The baseband processor 701 is used to execute some executable modules stored in the memory, such as computer programs, and the vectorization processor 702 is used to execute other executable modules stored in the memory. The memory 703 may include a high-speed random access memory (RAM, Random Access Memory), and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory. The communication connection between the system gateway and at least one other network element is realized through at least one network interface (which may be wired or wireless), and the Internet, wide area network, local network, metropolitan area network, etc. can be used.

As shown in FIG. 7 , in some implementations, the above-mentioned memory 703 stores program instructions, and the program instructions can be executed by the baseband processor 701 or the vectorization processor 702, wherein the above-mentioned vectorization processor 702 specifically performs the following steps: Obtain the current subframe in the time-domain converted TDD frame on each line, each line uses TDD frame for data transmission, and the TDD frames of all lines are transmitted synchronously, and the TDD frame of each line includes M subframes, and the above M is A positive integer; according to the position number of the current subframe in the corresponding TDD frame, the target control information of the current subframe is obtained, and the target control information is any one of the first control information, the second control information and the third control information The above-mentioned first control information points to the first type of crosstalk cancellation operation, the above-mentioned second control information points to the second type of crosstalk cancellation operation, the above-mentioned third control information points to the third type of crosstalk cancellation operation, the above-mentioned first type of crosstalk cancellation operation, the second type of crosstalk cancellation operation The second crosstalk cancellation operation is different from the third crosstalk cancellation operation; the crosstalk cancellation operation pointed to by the target control information is executed on the current subframe.

In some implementation manners, the vectorization processor 702 may further perform the following step: setting the control information corresponding to each subframe in the TDD frame on each line.

In some implementation manners, the vectorization processor 702 may further perform the following steps: acquire the Nth subframes of the TDD frames on all lines, and the M subframes include at least one of uplink subframes, downlink subframes and idle subframes The above-mentioned N is a positive integer greater than or equal to 1 and less than or equal to the above-mentioned M; if the Nth subframe of the TDD frame on all lines is an uplink subframe or a downlink subframe, it is a TDD frame on each line Set the first control information in the Nth subframe of all lines; if the Nth subframe of the TDD frame of at least one line in all lines is an idle subframe, the Nth subframe of the TDD frame of other lines except the above-mentioned at least one line in all lines The frame is an uplink subframe or a downlink subframe, the second control information is set for the Nth subframe of the TDD frame of the above-mentioned other lines, and the third control information is set for the Nth subframe of the TDD frame of the at least one line above; if all lines The Nth subframe of the TDD frame is an idle subframe, and the above third control information is set for the Nth subframe of the TDD frame on each line.

In some implementations, the vectorization processor 702 may further perform the following steps: according to the position number of the current subframe in the corresponding TDD frame, obtain the target control information of the current subframe from the corresponding coefficient selection table, one The coefficient selection table corresponds to one line, and the coefficient selection table includes M pieces of control information.

In some implementation manners, the vectorization processor 702 may further perform the following step: storing the coefficient selection table in a ping-pong buffer manner.

Optionally, in some implementation manners, the first crosstalk cancellation operation is to read the first crosstalk cancellation coefficient, the second crosstalk cancellation operation is to read the second crosstalk cancellation coefficient, and the third crosstalk cancellation operation is No crosstalk cancellation operation is performed.

In some implementation manners, the vectorization processor 702 may further perform the following steps: if the target control information is the first control information, read the first crosstalk cancellation coefficient, and calculate the current subframe according to the first crosstalk cancellation coefficient Perform a crosstalk cancellation operation; if the above-mentioned target control information is the above-mentioned second control information, read a second crosstalk cancellation coefficient, and perform a crosstalk cancellation operation on the above-mentioned current subframe according to the above-mentioned second crosstalk cancellation coefficient; if the above-mentioned target control information is the above-mentioned first Three control information, no crosstalk cancellation operation is performed on the current subframe.

In the foregoing embodiments, the descriptions of each embodiment have their own emphases, and for parts not described in detail in a certain embodiment, reference may be made to relevant descriptions of other embodiments.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

If the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , including several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-OnlyMemory), random access memory (RAM, RandomAccessMemory), magnetic disk or optical disk and other media that can store program codes.

The implementation method of crosstalk cancellation provided by the present invention and the central office access device have been introduced in detail above. For those of ordinary skill in the art, based on the idea of the embodiment of the present invention, both the specific implementation and the scope of application will be understood. There are changes, and in summary, the contents of this specification should not be construed as limiting the present invention.

Claims (15)

1. the implementation method of a crosstalk counteracting, it is characterized in that, being applied to local side access device, described local side access device is connected with some remote access device, by a connection between described local side access device and each remote access device, described method includes:

Described local side access device obtains the present sub-frame on each circuit in time domain conversion tdd frame, and each circuit all carries out data transmission with tdd frame, the tdd frame synchronous transfer of all circuits, and the tdd frame of each circuit all includes that M subframe, described M are positive integer；

Described local side access device is according to described present sub-frame position number in corresponding tdd frame, obtain the object control information of described present sub-frame, described object control information is the first control information, second controls any one in information and the 3rd control information, described first control information points to the operation of the first crosstalk counteracting, described second control information points to the operation of the second crosstalk counteracting, described 3rd control information points to the operation of the third crosstalk counteracting, the first crosstalk counteracting described operates, the operation of the second crosstalk counteracting and the operation of the third crosstalk counteracting are different；

Described local side access device performs the crosstalk counteracting operation pointed by described object control information to described present sub-frame.

Method the most according to claim 1, it is characterised in that include before the present sub-frame that described local side access device obtains on each circuit in tdd frame:

Described local side access device arranges the control information that on each circuit, in tdd frame, each subframe is corresponding.

Method the most according to claim 2, it is characterised in that described local side access device arranges the control information that on each circuit, in tdd frame, each subframe is corresponding and includes:

Described local side access device obtains the n-th subframe of tdd frame on all circuits, and described M subframe includes at least one in sub-frame of uplink, descending sub frame and idle subframe, and described N is more than or equal to 1, and the positive integer less than or equal to described M；

If the n-th subframe of the tdd frame on all circuits is sub-frame of uplink or descending sub frame, described local side access device is that the n-th subframe of the tdd frame on each circuit arranges the first control information；

If the n-th subframe of the tdd frame of at least one circuit in all circuits is idle subframe, the n-th subframe of the tdd frame removing other circuit of at least one circuit described in all circuits is sub-frame of uplink or descending sub frame, described local side access device is that the n-th subframe of the tdd frame of other circuit described arranges the second control information, and the n-th subframe for the tdd frame of at least one circuit described arranges the 3rd control information；

If the n-th subframe of the tdd frame of all circuits is idle subframe, the n-th subframe of the tdd frame that described local side access device is set on each article of circuit arranges described 3rd control information.

4. according to the method described in any one of claims 1 to 3, it is characterised in that described local side access device is according to described present sub-frame position number in corresponding tdd frame, and the object control information obtaining described present sub-frame includes:

Described local side access device is according to described present sub-frame position number in corresponding tdd frame, the object control information of described present sub-frame is obtained from corresponding coefficient selection table, one coefficient selects the corresponding circuit of table, and described coefficient selection table includes M control information.

Method the most according to claim 4, it is characterised in that the control information in described coefficient selection table stores in ping-pong buffer mode.

Method the most according to claim 1, it is characterized in that, the first crosstalk counteracting described operation is for reading the first crosstalk counteracting coefficient, and the operation of described the second crosstalk counteracting is for reading the second crosstalk counteracting coefficient, and the third crosstalk counteracting described operates as need not carry out crosstalk counteracting operation.

Method the most according to claim 6, it is characterised in that the crosstalk counteracting operation that described present sub-frame is performed pointed by described object control information by described local side access device includes:

If described object control information is described first control information, described local side access device reads the first crosstalk counteracting coefficient, according to described first crosstalk counteracting coefficient, described present sub-frame is carried out crosstalk counteracting operation；

If described object control information is described second control information, described local side access device reads the second crosstalk counteracting coefficient, according to described second crosstalk counteracting coefficient, described present sub-frame is carried out crosstalk counteracting operation；

If described object control information is described 3rd control information, described local side access device need not carry out crosstalk counteracting operation to described present sub-frame.

8. a local side access device, it is characterised in that described local side access device is connected with some remote access device, by a connection between described local side access device and each remote access device, described local side access device includes:

Subframe acquisition module, for the present sub-frame obtained on each circuit in time domain conversion tdd frame, each circuit all carries out data transmission with tdd frame, the tdd frame synchronous transfer of all circuits, and the tdd frame of each circuit all includes that M subframe, described M are positive integer；

Data obtaining module, for according to described present sub-frame position number in corresponding tdd frame, obtain the object control information of described present sub-frame, described object control information is the first control information, second controls any one in information and the 3rd control information, described first control information points to the operation of the first crosstalk counteracting, described second control information points to the operation of the second crosstalk counteracting, described 3rd control information points to the operation of the third crosstalk counteracting, the first crosstalk counteracting described operates, the operation of the second crosstalk counteracting and the operation of the third crosstalk counteracting are different；

Crosstalk processing module, for performing the crosstalk counteracting operation pointed by described object control information to described present sub-frame.

Local side access device the most according to claim 8, it is characterised in that described local side access device also includes:

Module is set, for arranging the control information that on each circuit, in tdd frame, each subframe is corresponding.

Local side access device the most according to claim 9, it is characterised in that

Described arrange module specifically for, obtain the n-th subframe of tdd frame on all circuits, described M subframe includes at least one in sub-frame of uplink, descending sub frame and idle subframe, and described N is more than or equal to 1, and less than or equal to the positive integer of described M；

If the n-th subframe of the tdd frame on all circuits is sub-frame of uplink or descending sub frame, described the n-th subframe that module is tdd frame on each circuit be set the first control information is set；If the n-th subframe of the tdd frame of at least one circuit in all circuits is idle subframe, the n-th subframe of the tdd frame removing other circuit of at least one circuit described in all circuits is sub-frame of uplink or descending sub frame, n-th subframe for the tdd frame of other circuit described arranges the second control information, and the n-th subframe for the tdd frame of at least one circuit described arranges the 3rd control information；If the n-th subframe of the tdd frame of all circuits is idle subframe, the n-th subframe for the tdd frame on each article of circuit arranges described 3rd control information.

The 11. local side access devices according to Claim 8～described in 10 any one, it is characterised in that

Described data obtaining module specifically for, according to described present sub-frame position number in corresponding tdd frame, obtaining the object control information of described present sub-frame from corresponding coefficient selection table, a coefficient selects the corresponding circuit of table, and described coefficient selection table includes M control information.

12. local side access devices according to claim 11, it is characterised in that the control information in described coefficient selection table stores in ping-pong buffer mode.

13. local side access devices according to claim 8, it is characterized in that, the first crosstalk counteracting described operation is for reading the first crosstalk counteracting coefficient, the operation of described the second crosstalk counteracting is for reading the second crosstalk counteracting coefficient, and the third crosstalk counteracting described operates as need not carry out crosstalk counteracting operation.

14. local side access devices according to claim 13, it is characterised in that

Described crosstalk processing module specifically for, if described object control information is described first control information, read the first crosstalk counteracting coefficient, according to described first crosstalk counteracting coefficient, described present sub-frame carried out crosstalk counteracting operation；If described object control information is described second control information, read the second crosstalk counteracting coefficient, according to described second crosstalk counteracting coefficient, described present sub-frame is carried out crosstalk counteracting operation；If described object control information is described 3rd control information, described present sub-frame need not be carried out crosstalk counteracting operation.

15. 1 kinds of local side access devices, it is characterized in that, described local side access device is connected with some remote access device, and by a connection between described local side access device and each remote access device, described local side access device includes: baseband processor and vectorized process device；

Wherein, described baseband processor is for communicating with described remote access device；

Described vectorized process device is for performing the step described in any one of claim 1～7.