CN108028815B

CN108028815B - Method for estimating crosstalk channel, vectoring control entity VCE and access node AN

Info

Publication number: CN108028815B
Application number: CN201680050068.8A
Authority: CN
Inventors: 蔡敏; 黄长富; 余辰光; 王晶凤
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2016-01-04
Filing date: 2016-01-04
Publication date: 2020-09-08
Anticipated expiration: 2036-01-04
Also published as: WO2017117704A1; CN108028815A

Abstract

The invention discloses a crosstalk channel estimation method, a Vectorization Control Entity (VCE) and AN Access Node (AN). The method comprises the following steps: sending a handover message to AN access node AN, the handover message comprising information of a first pilot signal PS and first indication information; receiving a handover response message sent by the AN, wherein the handover response message comprises the first index value and the second index value; receiving measurement information sent by CPE, wherein the measurement information comprises a measurement result obtained by the CPE according to a PS sent by the AN and a third index value of the PS corresponding to the measurement result; determining a fourth index value according to the first index value, the second index value and the third index value; and performing crosstalk channel estimation according to the fourth index value and the measurement result. The crosstalk channel estimation method of the embodiment of the invention can realize the sending of the pilot signal PS with the specified length, save the upgrading cost of CPE and reduce the sending time of PS.

Description

Method for estimating crosstalk channel, vectoring control entity VCE and access node AN

Technical Field

The present invention relates to the field of communications, and in particular, to a method for crosstalk channel estimation, a vectoring control entity VCE, and AN access node AN.

Background

Very High Speed Digital Subscriber Line (VDSL) is an asymmetric Digital Subscriber Line (DSL) technology. VDSL uses twisted pair wires for voice and data transmission, and only one VDSL modem, i.e. Customer Premises Equipment (CPE) for short, needs to be installed at the Customer side by installing VDSL on the existing telephone line. The most important thing of VDSL technology is that there is no need to re-route or change lines for broadband access. And the data signal and the telephone audio signal use different frequency bands, thereby ensuring that the data signal and the telephone audio signal do not interfere with each other and ensuring that the telephone can be called and called while the network is on line. At the user side, the CPE is used to Access to AN Access Node (Access Node, abbreviated as "AN") of a provider through a twisted pair, so as to Access to AN external network for normal internet Access. The AN may be located in a central office (central office, abbreviated as "CO") of AN operator, or may be located in another location.

Due to the presence of multiple users, signals between the multiple users can cause interference with each other, which is called crosstalk. The presence of crosstalk can cause distortion of the signal received at the subscriber side, causing the rate of VDSL to drop significantly.

Currently, in the prior art, a Vectoring (Vectoring) technology is generally adopted to solve the problem of VDSL rate reduction caused by such crosstalk. The Vectoring technology is used for realizing crosstalk evaluation of lines based on the orthogonality principle of a matrix. And under a large-scale line scene, the crosstalk between every two line pairs can be calculated by utilizing the orthogonality of the Hadamard matrix, and accurate crosstalk cancellation is carried out. However, for a 4n scheme, for example, in a scenario where the Pilot Sequence (PS) length is 384, there is a problem that the SSC acquired by the Vectoring Control Entity (VCE) does not match the actual SSC, which results in an error calculation result. For example, if a hadamard matrix of 384 × 384 is used, the AN sends a signal with SSC 1 after the 384 is flipped, and the CPE still fills the SSC 385 with a corresponding sequence number of 512 length during feedback, there is a mismatch.

Disclosure of Invention

The embodiment of the invention provides a crosstalk channel estimation method, a Vectorization Control Entity (VCE) and AN Access Node (AN), which can solve the problem that AN index value acquired by the VCE is not matched with AN actual value.

In a first aspect, a method for crosstalk channel estimation is provided, including:

sending a switching message to AN access node AN, wherein the switching message comprises information of a first pilot signal PS and first indication information, and the first indication information indicates a switching moment when the AN switches a PS sent to a customer premises CPE from a second PS to the first PS;

receiving a handover response message sent by the AN, where the handover response message includes a first index value and a second index value, the first index value is AN index value in a first index sequence of the first PS corresponding to a first time after the handover time, the second index value is AN index value in a second index sequence of the second PS corresponding to the first time, and lengths of the first index sequence and the second index sequence are different;

receiving measurement information sent by the CPE, where the measurement information includes a measurement result obtained by the CPE according to a PS sent by the AN and a third index value corresponding to the measurement result, where the third index value is AN index value in a third index sequence at the CPE;

determining a fourth index value according to the first index value, the second index value and the third index value, wherein the fourth index value is an index value of the first index sequence corresponding to the third index value;

and performing crosstalk channel estimation according to the fourth index value and the measurement result.

According to the crosstalk channel estimation method, the switching message is sent, the index value of the PS after switching is determined according to the switching response message, the condition that the index value obtained when the lengths of the PS are different is not matched with the actual value is avoided, the upgrading cost of the CPE can be saved, and the sending time of the PS is shortened.

With reference to the first aspect, in a first possible implementation manner, the determining a fourth index value according to the first index value, the second index value, and the third index value includes:

the fourth index value is determined according to the following equation,

when L > K, M ═ L-K + N)% a;

or, when L is less than or equal to K, M ═ N ═ C-K + N)% A

Wherein L is the third index value, L ∈ [0, C), C is the length of the third index sequence, K is the second index value, K ∈ [0, B), B is the length of the second index sequence, M is the fourth index value, N is the first index value, N ∈ [0, a), a is the length of the first index sequence, a is not equal to B, a is not equal to C, the "%" represents a remainder, and N is the number of flips of the third index sequence.

The n is the number of flips of the third index sequence.

With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner, the length of the first index sequence is 384, the length of the second index sequence is 512, and the length of the third index sequence is 1024.

In combination with all the above possible implementation manners, in a third possible implementation manner, the first indication information is synchronization signal level SSC information.

Here, the VCE specifies a switching time at which the AN switches the PS sent to the customer premises CPE from the second PS to the first PS through one SSC field.

In a second aspect, a method for crosstalk channel estimation is provided, including:

receiving a handover message sent by a Vectorization Control Entity (VCE), wherein the handover message includes information of a first Pilot Signal (PS) and first indication information, and the first indication information indicates a handover time at which the AN switches a PS sent to a Customer Premises Equipment (CPE) from a second PS to the first PS;

switching the PS sent to the customer premises CPE from the second PS to the first PS at the switching moment according to the switching message;

determining a first index value and a second index value, where the first index value is an index value in the first index sequence corresponding to a first time after the handover time, the second index value is an index value in a second index sequence of the second PS corresponding to the first time, and the lengths of the first index sequence and the second index sequence are different;

and sending a switching response message to the VCE, wherein the switching response message includes the first index value and the second index value, so that the VCE performs crosstalk channel estimation according to the switching response message.

With reference to the second aspect, in a first possible implementation manner, the length of the first index sequence is 384, and the length of the second index sequence is 512.

With reference to the second aspect or the first possible implementation manner of the second aspect, in a second possible implementation manner, the first indication information is synchronization signal level SSC information.

In a third aspect, a vectoring control entity, VCE, is provided, configured to perform the method of the first aspect or any possible implementation manner of the first aspect. In particular, the apparatus comprises means for performing the method of the first aspect described above or any possible implementation manner of the first aspect.

In a fourth aspect, there is provided AN access node, AN, for performing the method of the second aspect or any possible implementation manner of the second aspect. In particular, the apparatus comprises means for performing the method of the second aspect described above or any possible implementation of the second aspect.

In a fifth aspect, an apparatus for crosstalk channel estimation is provided, the apparatus comprising: receiver, transmitter, memory, processor and bus system. Wherein the receiver, the transmitter, the memory and the processor are connected by the bus system, the memory is configured to store instructions, and the processor is configured to execute the instructions stored by the memory to control the receiver to receive signals and control the transmitter to transmit signals, and when the processor executes the instructions stored by the memory, the execution causes the processor to execute the method of the first aspect or any possible implementation manner of the first aspect.

In a sixth aspect, an apparatus for crosstalk channel estimation is provided, the apparatus comprising: receiver, transmitter, memory, processor and bus system. Wherein the receiver, the transmitter, the memory and the processor are connected by the bus system, the memory is used for storing instructions, the processor is used for executing the instructions stored by the memory to control the receiver to receive signals and control the transmitter to transmit signals, and when the processor executes the instructions stored by the memory, the execution causes the processor to execute the method of the second aspect or any possible implementation manner of the second aspect.

In a seventh aspect, a system is provided, which includes the vectoring control entity VCE of the third aspect and the access node AN of the fourth aspect.

In an eighth aspect, there is provided a computer readable medium for storing a computer program comprising instructions for carrying out the method of the first aspect or any possible implementation manner of the first aspect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic diagram of the connection relationship of a VDSL system according to an embodiment of the present invention.

Fig. 2 is a schematic flow chart of an interaction flow of a method of crosstalk channel estimation according to an embodiment of the present invention.

Fig. 3 is a diagram illustrating a specific example of an indexing mechanism for pilot signals according to an embodiment of the present invention.

Fig. 4 is a schematic block diagram of a vectoring control entity according to an embodiment of the present invention.

Fig. 5 is a schematic block diagram of an access node according to an embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a vectoring control entity according to an embodiment of the present invention.

Fig. 7 is a schematic diagram of an access node according to an example of the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The technical scheme of the invention can be applied to a VDSL system. The VDSL system solves the crosstalk between lines through the vector technology, and the working principle is as follows: after the evaluation calculation for the entire line, a pre-compensation signal is generated in advance for each line and then added to the transmission signal of the AN. In the process of signal transmission, the signal of the pre-compensation part and the crosstalk signal in the line are mutually superposed and offset, so that the user side can receive the original signal with high restoration degree. The Vectoring technology is used for realizing crosstalk evaluation of lines based on the orthogonality principle of a matrix, and calculates crosstalk between the lines by utilizing orthogonality separation by forcibly issuing a certain number of orthogonal signals and receiving feedback signals corresponding to a CPE (customer premises equipment) side to fill row and column elements of the orthogonal matrix.

Fig. 1 shows a VDSL system connection diagram. The system comprises: a network side, a line side, and a user side. The network side can be a VCE and AN access node AN, the data transmission between the AN and a plurality of users can be controlled, the access node AN is connected with the user side through the line side, and the VCE can be integrated in the AN or independent of the AN. The line side may be a twisted pair, and the user side may be a plurality of CPEs, each corresponding to n users. Fig. 1 illustrates VCE, AN, and CPE as examples. The VCE is used for completing vectorring signal cancellation and is responsible for interacting with signals of the AN, the AN is used for receiving the vectorring cancellation signals of the VCE, and the CPE is responsible for sending signals when a user surfs the internet through a line.

In fig. 1, AN may correspond to a plurality of ports, one VCE for each port. Generally, the orthogonality of the hadamard matrix is utilized to separately calculate the crosstalk between every two line pairs in the VDSL large-scale line scene and accurately cancel the crosstalk. The Hadamard matrix is composed of 1 and-1 elements and satisfies Hn ═ n^I(where Hn' is the transpose of Hn and I is the unit square matrix) the n-th order square matrix. The 1, -1 elements in the hadamard matrix are pilot sequences, also called pilot signals. Each port is allocated to a certain row in the matrix, one element in one row is transmitted in each super frame time (64ms), and in order to ensure the orthogonality in the algorithm, namely to realize the product accumulation sum of the corresponding elements between two rows to be 0, the required transmission time is the product of the matrix column width and the super frame time. The more ports, the larger the required matrix width and the longer the duration of the pilot signal transmission. Therefore, when the matrix width is small, the time for transmitting the pilot signal is necessarily reduced. However, currently, there is a problem that index values do not match when PS transmission of 384 length is implemented in 512 length, and the present invention aims to solve the problem of interworking compatibility between the two lengths, thereby completing estimation of crosstalk channel.

It should be understood that the present invention is illustrated only with the system of fig. 1 as an example, and the number of CPEs is not limited thereto.

The method of crosstalk channel estimation according to an embodiment of the present invention will be described in detail below with reference to fig. 2. Fig. 2 shows an interactive flow diagram of a crosstalk channel estimation method according to an embodiment of the present invention. The VCE, AN and CPE in fig. 2 may correspond to respective entities in the VDSL system of fig. 1.

S201, the vectorization control entity VCE sends a handover message to the access node AN, where the handover message includes information of the first pilot signal PS and first indication information, and the first indication information indicates a handover time at which the AN switches the PS sent to the customer premises CPE from the second PS to the first PS.

The VCE issues a switching message to each port of the AN, where the switching message includes information of a PS sequence that each port needs to send, for example, the information of the PS sequence includes specified length information and content information of the PS, for example, the specified length information may be 384 lengths, and the content information of the PS is the PS to be sent to the CPE. In addition, the handover message further includes a handover time at which the VCE specifies AN, the handover time being a handover time at which a PS, i.e., a PS sent by the AN to the CPE, is handed over from the second PS to the first PS. For example, the first indication information is used to indicate a switching time when the AN switches the second PS with 512 length to the first PS with 384 length, and the AN switches the PS sent by all ports to the PS with 384 length at the switching time, thereby ensuring orthogonality of the sending signals between the ports.

Optionally, the first indication information is synchronization signal number (SSC) information. The VCE may specify a switching time at which the AN switches the PS sent to the customer premises CPE from the second PS to the first PS via AN SSC field.

S202, the AN switches the PS sent to the customer premises CPE from the second PS to the first PS at the switching time according to the switching message.

After receiving the switching message sent by the VCE, the AN switches the plurality of ports uniformly according to the switching message. For example, at this switching time, PS of 512 length originally transmitted by each port is collectively switched to PS of 384 length.

S203, the AN determines a first index value and a second index value, where the first index value is AN index value in a first index sequence of the first PS corresponding to a first time after the handover time, the second index value is AN index value in a second index sequence of the second PS corresponding to the first time, and the lengths of the first index sequence and the second index sequence are different.

In the embodiment of the present invention, the first index sequence represents a set of index values corresponding to the first PS, for example, if the first PS is 384 in length, the first index sequence may be 0,1,2, …, 383; the second index sequence represents a set of index values corresponding to the second PS, for example, if the second PS is 512 lengths, the second index sequence may be 0,1,2, …, 511.

In the embodiment of the present invention, the first time point indicates a time point after (including) the switching time point, that is, the first time point may be the switching time point or a time point after the switching time point.

After the AN completes the handover of the PS, it may determine index values corresponding to the first index sequence and the second index sequence at a first time after the handover. The first index sequence and the second index sequence have different lengths, and for example, index values corresponding to 384 and 512 lengths at a certain time after the switching time are determined. After determining the first index value and the second index value, the AN feeds back a switching response message to the VCE, so that the VCE performs crosstalk channel estimation according to the switching response message.

Here, the first index sequence and the second index sequence may be a set of PS indices, where the PS indices are used to indicate positions of transmitted pilot signals in a transmission sequence.

S204, the VCE receives a handover response message sent by the AN, where the handover response message includes the first index value and a second index value, the first index value is AN index value in the first index sequence corresponding to a first time after the handover time, the second index value is AN index value in a second index sequence of the second PS corresponding to the first time, and lengths of the first index sequence and the second index sequence are different.

S205, the VCE receives the measurement information sent by the CPE, where the measurement information includes a measurement result obtained by the CPE according to the PS sent by the AN and a third index value of the PS corresponding to the measurement result, and the third index value is AN index value in a third index sequence at the CPE.

After receiving the handover response message reported by the AN, the VCE starts receiving measurement information sent by the CPE, where the measurement information includes a measurement result obtained by the CPE according to a PS sent by the AN, and also includes a third index value of the PS corresponding to the measurement result, that is, a corresponding index value in AN index sequence at the CPE end. The third index sequence here is actually a counting sequence at the CPE. For example, the third index value is SSC, which indicates the position of the PS obtained by the receiving side. The measurement information is fed back to the VCE by the CPE in the form of a message. After the VCE collects a certain number of packets, it stops receiving the packets, where the number of received packets is the length of PS. For example, a PS of 384 length would receive 384 packets. The time for the VCE to receive the message theoretically needs 384 × 0.064 ═ 24.576s, and in practice, the message receiving time is controlled within 30s in consideration of the reasons of message delay, message packet loss and the like, so as to improve the probability of message aggregation. Here, the VCE sends the initiation message to the reception message with an intervening time interval less than one SSC period, which is about 64 ms.

S206, the VCE determines a fourth index value according to the first index value, the second index value and the third index value, where the fourth index value is an index value of the first index sequence corresponding to the third index value.

The VCE determines a fourth index value according to the first index value, the second index value, and the third index value, where the fourth index value is an index value corresponding to the third index value in the first index sequence. That is, after the PS completes handover, the index value of the new PS corresponding to a different index sequence needs to be determined.

And S207, the VCE carries out crosstalk channel estimation according to the fourth index value and the measurement result.

The VCE may calculate crosstalk between lines after aggregating the measurement based on the fourth index value and the measurement. For example, at a specified length of 384, the VCE receives 384 messages, i.e., measured offset signals.

In the embodiment of the present invention, the VCE sends a handover message to the AN, where the handover message includes information of a first PS and a time when the AN performs a second PS handover to the first PS, and then receives a handover response message sent by the AN, where the handover response message includes a first index value and a second index value, and after receiving a PS index value after the handover reported by the AN, the VCE receives measurement information of the CPE, where the measurement information includes a measurement result and a third index value corresponding to the measurement result, and estimates a crosstalk channel by aggregating measurement signals. Therefore, the VCE can collect the measurement information according to the index value after switching, and the condition that the obtained index value is not in accordance with the actual condition when the PS lengths are not matched is avoided, so that the switching of the PS with different lengths is completed under the condition that the CPE is not upgraded, the upgrading cost of the CPE can be saved, and the sending time of the PS is shortened.

It should be understood that, in the embodiment of the present invention, the numbers "first" and "second" … are only used for distinguishing different objects, such as for distinguishing different index values, or for distinguishing different index sequences, and do not limit the scope of the embodiment of the present invention.

It should also be understood that when PS sequence transmission of other lengths is required in the system, such as 400 lengths, the corresponding AN-side adaptation can be realized only by modifying the PS length information in the PS message.

It should also be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

Therefore, the crosstalk channel estimation method in the embodiment of the present invention determines the index value of the PS after the handover according to the handover response message by sending the handover message, thereby avoiding a situation that the index value obtained when the PS lengths are different is not matched with the actual value, saving the cost of upgrading the CPE, and reducing the sending time of the PS.

Optionally, in S206, the determining a fourth index value according to the first index value, the second index value and the third index value includes:

the fourth index value is determined according to the following equation,

when L > K, M ═ L-K + N)% a;

or, when L is less than or equal to K, M ═ N ═ C-K + N)% A

Here, n is generally only two cases, 0 and 1, due to the limitation of the time for receiving the message. That is, the third index sequence may not be flipped or flipped once within 30 s.

Optionally, in an embodiment of the present invention, the length of the first index sequence is 384, the length of the second index sequence is 512, and the length of the third index sequence is 1024.

For example, fig. 3 is a diagram illustrating a specific example of an index mechanism of a pilot signal according to an embodiment of the present invention. In fig. 3, the length of the first index sequence at the VCE side is 384, the length a of the designated PS sequence sent by the VCE and received by the AN is 384, the length B of the actual second index sequence at the AN side is 512, the length C of the third index sequence at the CPE side is 1024, in fig. 3, the conversion calculation may be performed through a formula for the index value corresponding to the PS at a certain time when the PS is switched from the 384 length to 512 length, and the index value actually corresponding to the third index value in the first index sequence, that is, the fourth index value, is calculated according to the obtained first index value N, the second index value K, and the third index value L. At the start of a port pair, it can be calculated by the above formula. Wherein L is within 0, C), K is within 0, B), N is within 0, A, and "%" represents the remainder.

When the third index value L is greater than the second index value K, the fourth index value is

M＝(L-K+N)％A；

For example, at the port alignment point in fig. 3, N is 255, K is 383,

when L511 > K, the fourth index value M (511-;

when L639 > K, the fourth index value M (639-;

when L is 0< K, the fourth index value M is (0+ 1024-. Here, if the third index sequence turns over again, the product of the number n of turns and 1024 needs to be complemented in the calculation.

The method of crosstalk channel estimation according to AN embodiment of the present invention is described in detail above with reference to fig. 1 to 3, and the vectoring control entity VCE600 and the access node AN700 according to AN embodiment of the present invention are described below with reference to fig. 4 and 5.

Fig. 4 shows a schematic block diagram of a vectoring control entity, VCE, 600 according to an embodiment of the present invention. As shown in fig. 4, the VCE600 includes:

a sending module 610, configured to send a handover message to AN access node AN, where the handover message includes information of a first pilot signal PS and first indication information, and the first indication information indicates a handover time at which the AN switches a PS sent to a user front end CPE from a second PS to the first PS;

a receiving module 620, configured to receive a handover response message sent by the AN, where the handover response message includes a first index value and a second index value, the first index value is AN index value in a first index sequence of the first PS corresponding to a first time after the handover time, the second index value is AN index value in a second index sequence of the second PS corresponding to the first time, and lengths of the first index sequence and the second index sequence are different;

the receiving module 620 is further configured to receive measurement information sent by the CPE, where the measurement information includes a measurement result obtained by the CPE according to a PS sent by the AN and a third index value of the PS corresponding to the measurement result, where the third index value is AN index value in a third index sequence at the CPE;

a determining module 630, configured to determine a fourth index value according to the first index value, the second index value, and the third index value received by the receiving module 620, where the fourth index value is an index value of the first index sequence corresponding to the third index value;

a processing module 640, configured to perform crosstalk channel estimation according to the fourth index value determined by the determining module 630 and the measurement result received by the receiving module 620.

Optionally, the determining module 630 is specifically configured to:

the fourth index value is determined according to the following equation,

when L > K, M ═ L-K + N)% a;

or, when L is less than or equal to K, M ═ N ═ C-K + N)% A

Optionally, the length of the first index sequence is 384, the length of the second index sequence is 512, and the length of the third index sequence is 1024.

Optionally, the first indication information is synchronization signal level SSC information.

Therefore, the vectorization control entity VCE of the embodiment of the present invention determines the index value of the PS after the handover according to the handover response message by sending the handover message, thereby avoiding a situation that the index value obtained when the PS lengths are different is not matched with the actual value, saving the cost of upgrading the CPE, and reducing the sending time of the PS.

Fig. 5 shows a schematic block diagram of AN access node AN700 according to AN embodiment of the invention. As shown in fig. 5, the AN700 includes:

a receiving module 710, configured to receive a handover message sent by a vectorization control entity VCE, where the handover message includes information of a first pilot signal PS and first indication information, and the first indication information indicates a handover time at which the AN switches a PS sent to a customer premises CPE from a second PS to the first PS;

a switching module 720, configured to switch, at the switching time, the PS sent to the customer premises CPE from the second PS to the first PS according to the switching message received by the receiving module;

a determining module 730, configured to determine a first index value and a second index value, where the first index value is an index value in the first index sequence corresponding to a first time after the handover time, the second index value is an index value in a second index sequence of the second PS corresponding to the first time, and lengths of the first index sequence and the second index sequence are different;

a sending module 740, configured to send a handover response message to the VCE, where the handover response message includes the first index value and the second index value, so that the VCE performs crosstalk channel estimation according to the handover response message.

Optionally, in an embodiment of the present invention, the length of the first index sequence is 384, and the length of the second index sequence is 512.

Therefore, the access node AN of the embodiment of the present invention determines the index value of the PS after handover according to the handover response message by sending the handover message, thereby avoiding a situation that the index value obtained when the PS lengths are different is not matched with the actual value, saving the cost of upgrading the CPE, and reducing the sending time of the PS.

Fig. 6 shows a structure of a vectoring controller entity VCE according to another embodiment of the present invention, which includes at least one processor 702 (e.g., a CPU), at least one network interface 705 or other communication interface, a memory 706, and at least one communication bus 703 for implementing connection communication between these devices. The processor 702 is configured to execute executable modules, such as computer programs, stored in the memory 706. The Memory 706 may comprise a Random Access Memory (RAM) and may further comprise a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The communication connection with at least one other network element is realized through at least one network interface 705 (which may be wired or wireless).

In some embodiments, the memory 706 stores a program 7061, and the program 7061 is executable by the processor 702, and the program includes:

Optionally, the processor 702 is specifically configured to:

the fourth index value is determined according to the following equation,

when L > K, M ═ L-K + N)% a;

or, when L is less than or equal to K, M ═ N ═ C-K + N)% A

Therefore, the vectorization control entity VCE for crosstalk channel estimation in the embodiment of the present invention determines the index value of the PS after switching according to the switching response message by sending the switching message, so as to avoid the situation that the index value obtained when the PS lengths are different is not matched with the actual value, save the cost of upgrading the CPE, and reduce the sending time of the PS.

Fig. 7 shows AN architecture of AN access node AN according to another embodiment of the present invention, which includes at least one processor 802 (e.g., CPU), at least one network interface 805 or other communication interface, a memory 806, and at least one communication bus 803 for enabling connectivity communications between these devices. The processor 802 is operable to execute executable modules, such as computer programs, stored in the memory 806. The memory 806 may comprise a high-speed Random Access Memory (RAM) and may also comprise a non-volatile memory, such as at least one disk memory. The communication connection with at least one other network element is realized through at least one network interface 805 (which may be wired or wireless).

In some embodiments, memory 806 stores a program 8061, which program 8061 may be executed by processor 802, including:

Optionally, the length of the first index sequence is 384, and the length of the second index sequence is 512.

Therefore, the access node AN for estimating the crosstalk channel in the embodiment of the present invention determines the index value of the PS after the handover according to the handover response message by sending the handover message, so as to avoid the situation that the index value obtained when the PS lengths are different is not matched with the actual value, save the cost of upgrading the CPE, and reduce the sending time of the PS.

It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It should be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A method of crosstalk channel estimation, characterized in that the method is performed by a vectoring control entity, VCE, comprising:

sending a switching message to AN Access Node (AN), wherein the switching message comprises information of a first Pilot Signal (PS) and first indication information, and the first indication information indicates a switching moment when the AN switches the PS sent to a Customer Premises Equipment (CPE) from a second PS to the first PS;

receiving measurement information sent by the CPE, wherein the measurement information comprises a measurement result obtained by the CPE according to a PS sent by the AN and a third index value corresponding to the measurement result, and the third index value is AN index value in a third index sequence at the CPE;

2. The method of claim 1, wherein determining a fourth index value from the first, second, and third index values comprises:

the fourth index value is determined according to the following equation,

when L > K, M ═ L-K + N)% a;

or, when L is less than or equal to K, M ═ N ═ C-K + N)% A

Wherein L is the third index value, L e [0, C), C is the length of the third index sequence, K is the second index value, K e [0, B), B is the length of the second index sequence, M is the fourth index value, N is the first index value, N e [0, A), A is the length of the first index sequence, A is not equal to B, A is not equal to C, the "%" represents a remainder, and N is the number of times of flipping of the third index sequence.

3. The method of claim 1 or 2, wherein the first index sequence is 384 in length, the second index sequence is 512 in length, and the third index sequence is 1024 in length.

4. The method of claim 1 or 2, wherein the first indication information is synchronization signal level (SSC) information.

5. A method of crosstalk channel estimation, characterized in that the method is performed by AN access node, AN, and comprises:

and sending a switching response message to the VCE, wherein the switching response message comprises the first index value and the second index value, so that the VCE can perform crosstalk channel estimation according to the switching response message.

6. The method of claim 5, wherein the first index sequence is 384 in length and the second index sequence is 512 in length.

7. The method of claim 5 or 6, wherein the first indication information is a synchronization signal level (SSC) information.

8. A vectoring control entity, VCE, comprising:

a sending module, configured to send a handover message to AN access node AN, where the handover message includes information of a first pilot signal PS and first indication information, and the first indication information indicates a handover time at which the AN switches a PS sent to a user front end CPE from a second PS to the first PS;

a receiving module, configured to receive a handover response message sent by the AN, where the handover response message includes a first index value and a second index value, the first index value is AN index value in a first index sequence of the first PS corresponding to a first time after the handover time, the second index value is AN index value in a second index sequence of the second PS corresponding to the first time, and lengths of the first index sequence and the second index sequence are different;

the receiving module is further configured to receive measurement information sent by the CPE, where the measurement information includes a measurement result obtained by the CPE according to a PS sent by the AN and a third index value of the PS corresponding to the measurement result, and the third index value is AN index value in a third index sequence at the CPE;

a determining module, configured to determine a fourth index value according to the first index value, the second index value, and the third index value received by the receiving module, where the fourth index value is an index value of the first index sequence corresponding to the third index value;

and the processing module is used for performing crosstalk channel estimation according to the fourth index value determined by the determining module and the measurement result received by the receiving module.

9. The VCE of claim 8, wherein the determination module is specifically configured to:

the fourth index value is determined according to the following equation,

when L > K, M ═ L-K + N)% a;

or, when L is less than or equal to K, M ═ N ═ C-K + N)% A

10. The VCE of claim 8 or 9, wherein the first index sequence is 384 in length, the second index sequence is 512 in length, and the third index sequence is 1024 in length.

11. The VCE of claim 8 or 9, wherein the first indication information is synchronization signal level SSC information.

12. AN access node, AN, comprising:

a receiving module, configured to receive a handover message sent by a vectorization control entity VCE, where the handover message includes information of a first pilot signal PS and first indication information, and the first indication information indicates a handover time at which the AN switches a PS sent to a customer premises CPE from a second PS to the first PS;

a switching module, configured to switch, at the switching time, the PS sent to the customer premises equipment CPE from the second PS to the first PS according to the switching message received by the receiving module;

a determining module, configured to determine a first index value and a second index value, where the first index value is an index value in the first index sequence corresponding to a first time after the handover time, the second index value is an index value in a second index sequence of the second PS corresponding to the first time, and lengths of the first index sequence and the second index sequence are different;

a sending module, configured to send a handover response message to the VCE, where the handover response message includes the first index value and the second index value, so that the VCE performs crosstalk channel estimation according to the handover response message.

13. The AN of claim 12, wherein the first index sequence is 384 in length and the second index sequence is 512 in length.

14. The AN of claim 12 or 13, wherein the first indication information is a synchronization signal level (SSC) information.