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

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 crosstalk channel estimation, 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 technique

Very High Speed Digital Subscriber Line (VDSL for short) is an asymmetric digital subscriber line (Digital Subscriber Line, DSL) technology. VDSL uses twisted pair cables for voice and data transmission. To install VDSL on existing telephone lines, it is only necessary to install a VDSL modem on the user side, that is, Customer Premises Entity (“CPE” for short). The most important thing about VDSL technology is that there is no need to re-deploy or change lines for broadband Internet access. In addition, the data signal and the telephone audio signal use different frequency bands, so as to ensure that the data signal and the telephone audio signal do not interfere with each other, and ensure that calls can be made while surfing the Internet. On the user side, the CPE is used to access the provider's access node (Access Node, "AN" for short) through a twisted pair cable, so as to connect to an external network for normal Internet access. The AN may be located at the operator's central computer room, that is, the central office (Central Office, "CO" for short) end, or may be located at other locations.

Since there are multiple users, the signals between the multiple users will interfere with each other, and this kind of signal interference is called crosstalk. The existence of crosstalk will cause distortion of the signal received by the user side, which greatly reduces the rate of VDSL.

Currently, in the prior art, a vectoring (Vectoring) technology is generally used to solve the problem of VDSL rate drop caused by such crosstalk. Vectoring technology is based on the principle of orthogonality of the matrix to realize the crosstalk evaluation of the line. In large-scale line scenarios, the orthogonality of Hadamard matrix can be used to calculate the crosstalk between two line pairs and perform accurate crosstalk cancellation. However, for the 4n method, for example, in a scenario where the length of the Pilot Sequence (PS) is 384, there may be a problem that the SSC obtained by the Vectoring Control Entity (VCE) does not match the actual one, resulting in incorrect calculation results. For example, if a Hadamard matrix of 384*384 is used, the AN will send a signal of SSC=1 after flipping after 384, while the CPE still fills SSC=385 with the corresponding sequence number of length 512 during feedback, and there is a mismatch.

SUMMARY OF THE INVENTION

The embodiments of the present invention provide a method for crosstalk channel estimation, a vectoring control entity VCE and an access node AN, which can solve the problem that the index value acquired by the VCE does not match the actual value.

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

Send a handover message to the access node AN, where the handover message includes information of the first pilot signal PS and first indication information, the first indication information instructs the AN to switch the PS sent to the user front end CPE from the second PS to the the switching moment of the first PS;

Receive a handover response message sent by the AN, where the handover response message includes a first index value and a second index value, and the first index value is in the first index sequence of the first PS corresponding to the first moment after the handover moment The index value of , the second index value is the index value in the second index sequence of the second PS corresponding to the first moment, and the length of the first index sequence and the second index sequence is different;

Receive 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 corresponding to the measurement result, where the third index value is in the third index sequence at the CPE the index value of ;

Determine 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;

Crosstalk channel estimation is performed according to the fourth index value and the measurement result.

In the method for crosstalk channel estimation according to the embodiment of the present invention, by sending a handover message and determining the index value of the PS after handover according to the handover response message, the situation that the index value obtained when the PS length is different does not match the actual value, and the CPE can be saved. The cost of the upgrade reduces the delivery time of the PS.

With reference to the first aspect, in a first possible implementation manner, the determining of the 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≤K, M=(L+n*C-K+N)%A

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

The n is the number of inversions 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 third The length of the index sequence is 1024.

Combining 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 the switching moment when the AN switches the PS sent to the user front end CPE from the second PS to the first PS through an SSC field.

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

Receive a handover message sent by the vectoring control entity VCE, where the handover message includes information of the first pilot signal PS and first indication information, the first indication information instructs the AN to switch the PS sent to the user front end CPE from the second PS to the switching moment of the first PS;

Switching the PS sent to the user front-end CPE from the second PS to the first PS at the switching moment according to the switching message;

Determine a first index value and a second index value, the first index value is an index value in the first index sequence corresponding to the first moment after the switching moment, and the second index value is the first index value corresponding to the first moment. The index value in the second index sequence of the second PS, the length of the first index sequence and the second index sequence are different;

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 can perform crosstalk channel estimation according to the handover response message.

In the method for crosstalk channel estimation according to the embodiment of the present invention, by sending a handover message and determining the index value of the PS after handover according to the handover response message, the situation that the index value obtained when the PS length is different does not match the actual value, and the CPE can be saved. The cost of the upgrade reduces the delivery time of the PS.

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 the second possible implementation manner, the first indication information is synchronization signal level SSC information.

Here, the VCE specifies the switching moment when the AN switches the PS sent to the user front end CPE from the second PS to the first PS through an SSC field.

In a third aspect, a vectoring control entity VCE is provided for executing the method in the first aspect or any possible implementation manner of the first aspect. Specifically, the apparatus includes a unit for performing the method in the above-mentioned first aspect or any possible implementation manner of the first aspect.

In a fourth aspect, an access node AN is provided for executing the method in the second aspect or any possible implementation manner of the second aspect. Specifically, the apparatus includes means for performing the method in the above-mentioned second aspect or any possible implementation manner of the second aspect.

In a fifth aspect, an apparatus for crosstalk channel estimation is provided, the apparatus comprising: a receiver, a transmitter, a memory, a processor and a bus system. Wherein, the receiver, the transmitter, the memory and the processor are connected through the bus system, the memory is used for storing instructions, and the processor is used for executing the instructions stored in the memory to control the receiver to receive signals and control the transmission The processor sends a signal, and when the processor executes the instructions stored in the memory, the execution causes the processor to perform the method of the first aspect or any possible implementation of the first aspect.

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

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

In an eighth aspect, a computer-readable medium is provided for storing a computer program, the computer program comprising instructions for performing the method in the first aspect or any possible implementation of the first aspect.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

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

FIG. 2 is a schematic flowchart of an interaction flow of a method for crosstalk channel estimation according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of a specific example of an indexing mechanism of a pilot signal 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 structural diagram of an access node according to the present invention, which is an example.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The technical scheme of the present invention can be applied to a VDSL system. The VDSL system solves the crosstalk between lines through the Vectoring technology. The working principle is: after evaluating and calculating the entire line, a pre-compensation signal is generated for each line in advance, and then superimposed on the AN transmission signal. In this way, in the process of signal transmission, the signal of the pre-compensation part and the crosstalk signal in the line are superimposed and canceled, so that the user side can receive the original signal with a high degree of restoration. Vectoring technology is based on the principle of orthogonality of the matrix to realize the crosstalk evaluation of the line. By forcing a certain number of orthogonal signals to be sent, the corresponding feedback signals on the CPE side are received to fill up the row and column elements of the orthogonal matrix, so as to use the orthogonality to separate Calculate the crosstalk between the lines.

Figure 1 shows a VDSL system connection diagram. The system includes: a network side, a line side and a user side. The network side can be a VCE and an access node AN, which can control the AN to transmit data with multiple users. The access node AN is connected to 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 multiple CPEs, corresponding to n users respectively. FIG. 1 takes VCE, AN and CPE as examples for illustration. The VCE is used to cancel the Vectoring signal and is responsible for interacting with the signals of the AN. The AN is used to receive the Vectoring cancellation signal of the VCE, and the CPE is responsible for sending the signal when the user surfs the Internet through the line.

In Figure 1, an AN may correspond to multiple ports, and each port corresponds to a VCE. Generally, the orthogonality of the Hadamard matrix is used to separate and calculate the crosstalk between two wire pairs in the VDSL large-scale line scenario, and perform accurate crosstalk cancellation. The Hadamard matrix is composed of 1 and -1 elements and satisfies Hn*Hn'=n ^I (here Hn' is the transpose of Hn, and I is the unit square matrix) n-order square matrix. The 1 and -1 elements in the Hadamard matrix are the pilot sequence, also called the pilot signal. Each port is assigned to a row in the matrix, and each superframe time (64ms) sends one element in a row. In order to ensure the orthogonality of the algorithm, that is, the multiplication and accumulation of the corresponding elements between the two rows is 0. The required transmission time is the product of the matrix column width and the superframe time. The more ports, the larger the matrix width required and the longer the duration of transmitting the pilot signal. Therefore, when the matrix width is small, the time for transmitting the pilot signal must be reduced. However, at present, there is a problem of index value mismatch when implementing PS transmission of 384 lengths in 512 lengths. The present invention aims to solve the problem of intercommunication compatibility between the two lengths, so as to complete the estimation of the crosstalk channel.

It should be understood that the present invention is only described by taking the system of FIG. 1 as an example, and the number of CPEs is not limited, and the present invention is not limited thereto.

A method for 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 a schematic diagram of an interaction flow of a method for crosstalk channel estimation according to an embodiment of the present invention. The VCE, AN and CPE in FIG. 2 may correspond to corresponding entities in the VDSL system of FIG. 1 .

S201, the vectoring 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, where the first indication information indicates that the AN will send the PS of the user front end CPE Switching time from the second PS to the first PS.

The VCE sends a handover message to each port of the AN, and the handover message includes the information of the PS sequence that each port needs to send. For example, the information of the PS sequence includes the specified length information and content information of the PS. For example, the specified length information can be 384 length, the content information of the PS is the PS to be sent to the CPE. In addition, the handover message also includes the handover time of the designated AN by the VCE, the handover time is the handover time of switching the PS from the second PS to the first PS, and the PS is the PS sent by the AN to the CPE. For example, the first indication information is used to indicate the switching moment when the AN switches the second PS of length 512 to the first PS of length 384. At the switching moment, the AN uniformly switches the PS sent by all ports to the PS of length 384, thereby ensuring that The orthogonality of the signals sent between the ports is ensured.

Optionally, the first indication information is Sync Symbol Count (Sync Symbol Count, "SSC" for short) information. The VCE can specify the switching moment when the AN switches the PS sent to the user front-end CPE from the second PS to the first PS through an SSC field.

S202, the AN switches the PS sent to the user front-end CPE from the second PS to the first PS at the switching moment according to the switching message.

After receiving the handover message sent by the VCE, the AN uniformly switches the multiple ports according to the handover message. For example, at the switching moment, the PS of length 512 originally sent by each port is uniformly switched to the PS of length 384.

S203, the AN determines a first index value and a second index value, the first index value is an index value in the first index sequence of the first PS corresponding to the first moment after the switching moment, and the second index value is The index value in the second index sequence of the second PS corresponding to the first moment, the first index sequence and the second index sequence have different lengths.

In this 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 has a length of 384, 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 has a length of 512, the second index sequence may be 0, 1, 2, . . . , 511.

In this embodiment of the present invention, the first moment represents a certain moment after the switching moment (including the switching moment), that is, the first moment may be the switching moment or a certain time after the switching moment.

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

Here, the first index sequence and the second index sequence may be a set of PS indexes, where the PS index is used to indicate the position of the transmitted pilot signal in the transmission sequence.

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

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

After receiving the handover response message reported by the AN, the VCE starts to receive the measurement information sent by the CPE. The measurement information includes the measurement result obtained by the CPE according to the PS sent by the AN, and also includes the third index value of the PS corresponding to the measurement result, that is, The corresponding index value in the index sequence at the CPE side. The third index sequence here is actually the count 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 packets, where the number of received packets is the length of the PS. For example, a PS corresponding to a length of 384 will receive 384 packets. In theory, it takes 384*0.064=24.576s for the VCE to receive a packet. In practice, considering the reasons such as message delay and packet loss, the packet reception time is controlled within 30s to improve the probability of the packets being collected. Here, the time interval between the VCE sending the start message and the receiving message is less than one SSC period, and one SSC period is about 64ms.

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, and the fourth index value is an index value corresponding to the third index value in the first index sequence. That is to say, after the PS completes the handover, it is necessary to determine the index values corresponding to the new PS in different index sequences.

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

After the VCE collects the measurement result according to the fourth index value and the measurement result, the crosstalk between the lines can be calculated. For example, when the specified length is 384, the VCE receives 384 packets, which are the measured deviation signals.

In this embodiment of the present invention, the VCE sends a handover message to the AN, where the handover message includes the information of the first PS and the moment when the AN performs the handover from the second PS to the first PS, and then receives the handover response message sent by the AN. The handover response message includes the first index value and the second index value. After receiving the PS index value after the handover reported by the AN, the VCE receives the measurement information of the CPE, and the measurement information includes the measurement result and the third index value corresponding to the measurement result. , and estimate the crosstalk channel by collecting the measurement signals. In this way, the VCE can collect measurement information according to the index value after the handover, avoiding the situation that the obtained index value does not match the actual value when the PS length does not match, so that the handover of different lengths of the PS can be completed without upgrading the CPE. It can save the cost of CPE upgrade and reduce the transmission time of PS.

It should be understood that, in this embodiment of the present invention, the numbers "first", "second"... are only used to distinguish different objects, for example, to distinguish different index values or to distinguish different index sequences, and are not relevant to the embodiments of the present invention. range constitutes a limitation.

It should also be understood that when the system needs to implement PS sequence transmission of other lengths, such as a length of 400, the corresponding AN side adaptation can be implemented 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 size of the sequence numbers of the above-mentioned processes does not mean the sequence of execution, and the execution sequence of each process should be determined by its functions and internal logic, rather than the implementation of the present invention. The implementation of the examples constitutes no limitation.

Therefore, in the method for crosstalk channel estimation according to the embodiment of the present invention, the index value of the PS after the handover is determined 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 length is different does not match the actual value. It saves the cost of CPE upgrade and reduces the transmission time of PS.

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

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

When L>K, M=(L-K+N)%A;

Or, when L≤K, M=(L+n*C-K+N)%A

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

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

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 shows a schematic diagram of a specific example of an indexing mechanism of a pilot signal according to an embodiment of the present invention. In Fig. 3, the length of the first index sequence on the VCE side is 384, the specified PS sequence length A sent by the VCE received by the AN is 384 length, and the actual second index sequence length B on the AN side is 512 length, The length C of the third index sequence on the CPE side is 1024. In FIG. 3, for the index value corresponding to the PS at a certain moment when the PS is switched from the length of 384 to the length of 512, it can be converted and calculated by the formula. The index value N, the second index value K, and the third index value L calculate the index value actually corresponding to the third index value in the first index sequence, that is, the fourth index value. At the port pair starting point, it can be calculated by the above formula. Among them, L∈[0, C), K∈[0, B), N∈[0, A), “%” means 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 Figure 3, N=255, K=383,

When L=511>K, the fourth index value M=(511-383+255)% 384=383;

When L=639>K, the fourth index value M=(639-383+255)% 384=127;

When L=0<K, the fourth index value M=(0+1024-383+255)%384=128, where the L value in the measurement information fed back by the CPE is reversed, so it needs to be supplemented with 1024 before further conversion , substituted into the formula M=(L+n*C-K+N)%A for calculation. Here, if the third index sequence is flipped again, the product of the flip times n and 1024 needs to be supplemented during calculation.

Therefore, in the method for crosstalk channel estimation according to the embodiment of the present invention, the index value of the PS after the handover is determined 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 length is different does not match the actual value, and can It saves the cost of CPE upgrade and reduces the transmission time of PS.

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

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

The sending module 610 is configured to send a handover message to the access node AN, where the handover message includes the information of the first pilot signal PS and the first indication information, the first indication information indicates that the AN will send the PS slave to the user front end CPE. The switching moment at which the second PS switches 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 the first PS corresponding to the first moment after the handover moment The index value in the first index sequence of , the second index value is the index value in the second index sequence of the second PS corresponding to the first moment, the length 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 the PS sent by the AN and a third index value of the PS corresponding to the measurement result, the third index value is the index value in the third index sequence at the CPE;

The determining module 630 is 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 corresponds to the third index value. an index value of an index sequence;

The processing module 640 is 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 used for:

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

When L>K, M=(L-K+N)%A;

Or, when L≤K, M=(L+n*C-K+N)%A

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

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 vectorized control entity VCE 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 length is different does not match the actual value, and can It saves the cost of CPE upgrade and reduces the transmission time of PS.

Figure 5 shows a schematic block diagram of an access node AN700 according to an embodiment of the present invention. As shown in Figure 5, the AN700 includes:

The receiving module 710 is configured to receive a handover message sent by the vectoring control entity VCE, where the handover message includes information of the first pilot signal PS and first indication information, where the first indication information indicates that the AN will send the information to the user front end CPE. The switching moment of the PS switching from the second PS to the first PS;

a switching module 720, configured to switch the PS sent to the user front-end CPE from the second PS to the first PS at the switching moment according to the switching message received by the receiving module;

A determination module 730, configured to determine a first index value and a second index value, the first index value is an index value in the first index sequence corresponding to the first moment after the switching moment, and the second index value is the the index value in the second index sequence of the second PS corresponding to the first moment, the length of the first index sequence and the second index sequence are different;

The sending module 740 is 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 can perform 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.

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

Therefore, the access node AN 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 length is different does not match the actual value, and can save energy. The cost of CPE upgrade reduces the transmission time of PS.

6 shows a structure of a vectoring controller entity VCE provided by another embodiment of the present invention, including at least one processor 702 (eg, CPU), at least one network interface 705 or other communication interface, memory 706, and at least one communication interface The bus 703 is used to realize the connection and communication between these devices. The processor 702 is used to execute executable modules, such as computer programs, stored in the memory 706 . The memory 706 may include a high-speed random access memory (RAM: RandomAccess Memory), and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory. A communication connection with at least one other network element is achieved through at least one network interface 705 (which may be wired or wireless).

In some embodiments, the memory 706 stores a program 7061 that can be executed by the processor 702, and the program includes:

Send a handover message to the access node AN, where the handover message includes information of the first pilot signal PS and first indication information, the first indication information instructs the AN to switch the PS sent to the user front end CPE from the second PS to the the switching moment of the first PS;

Receive a handover response message sent by the AN, where the handover response message includes a first index value and a second index value, and the first index value is in the first index sequence of the first PS corresponding to the first moment after the handover moment The index value of , the second index value is the index value in the second index sequence of the second PS corresponding to the first moment, and the length of the first index sequence and the second index sequence is different;

Receive 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 corresponding to the measurement result, where the third index value is in the third index sequence at the CPE the index value of ;

Determine 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;

Crosstalk channel estimation is performed according to the fourth index value and the measurement result.

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≤K, M=(L+n*C-K+N)%A

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

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 vectorized control entity VCE for crosstalk channel estimation 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 mismatch between the index value obtained when the PS length is different and the actual value In this case, the cost of CPE upgrade can be saved and the transmission time of PS can be reduced.

7 shows a structure of an access node AN provided by another embodiment of the present invention, including at least one processor 802 (eg CPU), at least one network interface 805 or other communication interface, memory 806, and at least one communication bus 803 , which is used to realize the connection communication between these devices. The processor 802 is used to execute executable modules, such as computer programs, stored in the memory 806 . The memory 806 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 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, the memory 806 stores a program 8061 that can be executed by the processor 802, and the program includes:

Receive a handover message sent by the vectoring control entity VCE, where the handover message includes information of the first pilot signal PS and first indication information, the first indication information instructs the AN to switch the PS sent to the user front end CPE from the second PS to the switching moment of the first PS;

Switching the PS sent to the user front-end CPE from the second PS to the first PS at the switching moment according to the switching message;

Determine a first index value and a second index value, the first index value is an index value in the first index sequence corresponding to the first moment after the switching moment, and the second index value is the first index value corresponding to the first moment. The index value in the second index sequence of the second PS, the length of the first index sequence and the second index sequence are different;

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 can perform crosstalk channel estimation according to the handover response message.

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

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

Therefore, the access node AN for crosstalk channel estimation according to 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 mismatch between the index value obtained when the PS length is different and the actual value. In this case, the cost of CPE upgrade can be saved and the transmission time of PS can be reduced.

It should be understood that the term "and/or" in this document is only an association relationship to describe associated objects, indicating that there can be three kinds of relationships, for example, A and/or B, which can mean that A exists alone, and A and B exist at the same time , there are three cases of B alone. In addition, the character "/" in this document generally indicates that the related objects are an "or" relationship.

It should be understood that, in various embodiments of the present invention, the size of the sequence numbers of the above-mentioned processes does not mean the sequence of execution, and the execution sequence of each process should be determined by its functions and internal logic, rather than the embodiments of the present invention. implementation constitutes any limitation.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of the present invention.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described systems, devices and units may refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus 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 may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

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

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

The functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, Read-Only Memory (ROM, Read-Only Memory), Random Access Memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes .

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (14)

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 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, 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;

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.

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:

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 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

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.

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.

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