WO2019020055A1

WO2019020055A1 - Method and device for processing channel matrix

Info

Publication number: WO2019020055A1
Application number: PCT/CN2018/097062
Authority: WO
Inventors: 刘铮
Original assignee: 中兴通讯股份有限公司
Priority date: 2017-07-28
Filing date: 2018-07-25
Publication date: 2019-01-31
Also published as: CN109309639A

Abstract

Provided are a method and device for processing a channel matrix. The method comprises: receiving signalling sent by a maximum ratio transmission (MRT) controller, wherein the signalling is set to indicate an identifier of a line pair quitting a pre-determined group and an identifier of the pre-determined group, or to indicate an identifier of a line pair entering a pre-determined group and an identifier of the pre-determined group; according to the identifier of the line group and the identifier of the pre-determined group, acquiring a pre-coding coefficient matrix; and performing diagonalisation on the MRT channel matrix by means of the pre-coding coefficient matrix, wherein the MRT channel matrix is generated by an MRT pre-coder according to the MRT pre-coding matrix and a far end crosstalk (FEXT) channel matrix, and the number of rows and columns of the MRT channel matrix is the number of pieces of activated customer premises equipment (CPE).

Description

Channel matrix processing method and device

The present application claims the priority of the Chinese Patent Application, filed on Jan. 28,,,,,,,,,,,,,,,,,,,,,,,

Technical field

This paper relates to the field of Digital Subscriber Line (DSL) technology, for example, to a channel matrix processing method and apparatus.

Background technique

Maximum Ratio Transmission (MRT) technology was proposed by BT in the ITU-T proposal in September 2016. It is a method to effectively utilize the idle pair in the vector group to obtain the spatial diversity gain. The principle of MRT is to convert the strong crosstalk between channels into the received signal-to-noise ratio (SNR) gain of a specified customer terminal equipment (CPE) through precoding diversity at the transmitting end. Rate boosting.

Assuming that there are N twisted pairs and K active users (number of CPEs) in a vector group, FIG. 1 is a schematic diagram of a simplified use case of a vector group in the related art, as shown in FIG. 1 , N=8 and K=2 in the vector group. That includes two active CPEs and six idle lines,

lines

2, 3 and 5 are used to support CPE_2, and other lines are used to support CPE_4.

H _sub denotes a channel matrix of (K*N), the signal r is a column vector of (K*1) received by K active users, and s is a column vector of (N*1). H _k,n denotes a channel that is sent from the distributed processing unit (DPU) port n and received by CPE_k. among them,

r=H _sub s+n

Through a (N*K) precoding matrix P _sub , such that s = P _sub x, x represents the symbol to be transmitted, is the column vector of (K * 1), CPE can be used to vectorize than N lines (vectoring ) Higher SNR.

If all N twisted pairs can support the kth CPE (such as K=1), the equivalent channel path is the kth line of H, marked as

To maximize the SNR to increase the rate, configure the precoder as a column vector.

μ is a normalization factor, and precoding symbols from different transmitters are coherently accumulated, and the received signal of the kth active CPE is derived.

If K>1, such as K=2, it belongs to the case of group-MRC. The i-th column of H _sub represents the channel path from the ith transmitter. There is only one target receiver for each transmitter. In other words, there is only one CPE in each group. In order to eliminate crosstalk between activated users (ie, activated CPE), it is necessary to satisfy H _sub P _sub = D, where D is a diagonal matrix of (K*K).

However, when the wired pair "enters" or "leaves" the group, what changes will be made to the precoding processing of the packet; and when the "enter" or "away" line pair is the pair in which the user is activated, What changes will be made to the group itself; and when the line pair "enters" or "leaves" the group, how does the MRT precoder recalculate the P _{sub in the} packet group, Far-End Crosstalk (FEXT) pre- How the encoder recalculates the H _sub between packet groups is not described in the related art. Therefore, in the related art, when a wired pair "enters" or "leaves" a group, crosstalk between groups cannot be eliminated.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

The embodiment of the present invention provides a channel matrix processing method and apparatus to avoid the phenomenon that crosstalk between groups cannot be eliminated when a wired pair "enters" or "leaves" a group.

According to an embodiment herein, a channel matrix processing method is provided, comprising: receiving a signaling transmitted by a maximum ratio transmission MRT controller, wherein the signaling is set to indicate an identifier of a line pair that exits a predetermined packet and the An identifier of the predetermined packet, or an identifier indicating a line pair entering the predetermined packet and an identifier of the predetermined packet; acquiring a matrix of precoding coefficients according to the identifier of the pair and the identifier of the predetermined packet; The matrix diagonalizes the MRT channel matrix, wherein the MRT channel matrix is generated by the MRT precoder according to the MRT precoding matrix and the far-end crosstalk FEXT channel matrix, and the number of rows of the MRT channel matrix The number of columns is the number of CPEs that activate the client terminal device.

In an embodiment, acquiring the precoding coefficient matrix according to the identifier of the line pair and the identifier of the predetermined packet comprises: determining a precoding coefficient matrix according to the identifier of the line pair and the identifier of the predetermined group The dimension of the precoding coefficient is obtained by a vectorization algorithm and the dimension.

In an embodiment, determining, according to the identifier of the pair of lines and the identifier of the predetermined group, that the dimension of the matrix of precoding coefficients comprises at least one of the following: the signaling is set to indicate a line pair that exits the predetermined grouping. If the line pair is a pair corresponding to the idle CPE, or indicates the identifier of the pair entering the predetermined packet and the pair is the pair corresponding to the idle CPE, the dimension of the precoding coefficient matrix is equal to a dimension of a matrix of precoding coefficients when the pair of lines exits the predetermined packet, or a dimension of a matrix of precoding coefficients when no pair of lines enters the predetermined packet; the signaling is set to indicate the exit of the predetermined packet In the case of the identification of the pair of lines and the pair of lines is the pair of lines corresponding to the activated CPE, the dimension of the matrix of precoding coefficients is the basis of the dimension of the matrix of precoding coefficients when no pair of lines exits the predetermined group The row is reduced by one row or one column, or one row and one column are reduced on the basis of the dimension of the precoding coefficient matrix when no pair of lines enters the predetermined group.

According to another embodiment herein, a channel matrix processing method is provided, comprising: receiving a signaling transmitted by a maximum ratio transmission MRT controller, wherein the signaling is set to indicate an identifier and a location of a line pair that exits a predetermined packet. Determining an identifier of the predetermined packet, or an identifier indicating a pair of the entry into the predetermined packet and an identifier of the predetermined packet; acquiring an MRT precoding matrix according to the identifier of the pair and the identifier of the predetermined packet; Encoding matrix and far-end crosstalk FEXT channel matrix, generating an MRT channel matrix and transmitting the MRT channel matrix to a vector control unit VCE, so that the VCE diagonalizes the MRT channel matrix, wherein the MRT The number of rows and columns of the channel matrix is the number of CPEs that activate the client terminal device.

In an embodiment, generating the MRT channel matrix according to the MRT precoding matrix and the far-end crosstalk FEXT channel matrix comprises: acquiring an intermediate MRT channel matrix according to the MRT precoding matrix and the far-end crosstalk FEXT channel matrix; The MRT channel matrix is generated by culling the column vector corresponding to the idle CPE from the intermediate MRT channel matrix.

In an embodiment, according to the identifier of the line pair and the identifier of the predetermined group, acquiring an MRT precoding matrix includes at least one of: setting the identifier of the line pair indicating that the predetermined group is exited In the case where the line pair is a pair corresponding to the idle CPE, the MRT precoding matrix is reduced by one column based on the MRT precoding matrix when no line pair exits the predetermined packet, or enters the line without the pair Decreasing a column based on the MRT precoding matrix at the time of the predetermined packet, wherein the reduced column is a column corresponding to the pair of wires exiting the predetermined packet; the signaling is set to indicate the identity of the pair entering the predetermined packet and Where the line pair is a pair of lines corresponding to the idle CPE, the MRT precoding matrix is added to the MRT precoding matrix when no line pair exits the predetermined group, or Adding a column to the MRT precoding matrix at the time of the predetermined packet, wherein the added column is a column corresponding to the pair of lines entering the predetermined packet; and the signaling is set to indicate that the predetermined point is to be withdrawn In the case where the pair of lines is identified and the pair is a pair of pairs corresponding to the activated CPE, the transmitting ports of all pairs in the predetermined group are closed, and the MRT precoding matrix is to exit the reservation without a pair Decreasing a row on the basis of the MRT precoding matrix at the time of grouping and reducing the number of columns in which the number of pairs of lines in the predetermined packet is equal, or reducing one line and reducing the number of lines on the basis of the MRT precoding matrix when the line pair enters the predetermined grouping The number of columns in which the number of pairs of lines in the predetermined group is equal, wherein the reduced behavior is the row corresponding to the predetermined group, and the reduced column is the column corresponding to the pair of lines in the predetermined group.

According to still another embodiment herein, there is provided a channel matrix processing apparatus, comprising: a receiving module configured to receive a signal transmitted by a maximum ratio transmission MRT controller, wherein the signaling is set to indicate a line exiting a predetermined packet An identifier of the pair and an identifier of the predetermined packet, or an identifier indicating a line pair entering the predetermined packet and an identifier of the predetermined packet; and an obtaining module configured to acquire according to the identifier of the pair and the identifier of the predetermined group a precoding coefficient matrix; a processing module configured to diagonalize the MRT channel matrix by the precoding coefficient matrix, wherein the MRT channel matrix is an MRT precoder according to the MRT precoding matrix and far end crosstalk The FEXT channel matrix is generated, and the number of rows and columns of the MRT channel matrix is the number of activated client terminal devices CPE.

In an embodiment, the acquiring module is further configured to determine a dimension of the precoding coefficient matrix according to the identifier of the line pair and the identifier of the predetermined group; and obtain the location by using a vectorization algorithm and the dimension A matrix of precoding coefficients is described.

According to still another embodiment herein, there is provided a channel matrix processing apparatus, comprising: a receiving module configured to receive a signal transmitted by a maximum ratio transmission MRT controller, wherein the signaling is set to indicate a line exiting a predetermined packet An identifier of the pair and an identifier of the predetermined packet, or an identifier indicating a line pair entering the predetermined packet and an identifier of the predetermined packet; and an obtaining module configured to acquire according to the identifier of the pair and the identifier of the predetermined group An MRT precoding matrix; a generating module, configured to generate an MRT channel matrix according to the MRT precoding matrix and a far end crosstalk FEXT channel matrix, and send the MRT channel matrix to a vector control unit VCE, so that the VCE pair The MRT channel matrix is diagonalized, wherein the number of rows and columns of the MRT channel matrix is the number of activated client terminal devices CPE.

In an embodiment, the generating module is further configured to acquire an intermediate MRT channel matrix according to the MRT precoding matrix and the far-end crosstalk FEXT channel matrix; by using a column vector corresponding to the idle CPE from the intermediate MRT channel matrix In the middle culling mode, the MRT channel matrix is generated.

According to still another embodiment herein, there is also provided a storage medium comprising a stored program, wherein the program is executed to perform the method of any of the above.

According to still another embodiment herein, there is also provided a processor, the processor being arranged to run a program, wherein the program is executed to perform the method of any of the above.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

DRAWINGS

The drawings described herein are provided to provide a further understanding of the invention, and are intended to be a part of this application. In the drawing:

FIG. 1 is a schematic diagram of a simplified use case of a vector group in the related art.

2 is a hardware structural block diagram of a mobile terminal of a channel matrix processing method provided by an embodiment of the present disclosure.

FIG. 3 is a flowchart of a channel matrix processing method according to an embodiment of the present disclosure.

4 is a flow chart of a channel matrix processing method provided by another embodiment of the present disclosure.

FIG. 5 is a schematic diagram of a precoding processing architecture provided by an embodiment of the present disclosure.

FIG. 6 is a structural block diagram of a channel matrix processing apparatus according to an embodiment of the present disclosure.

FIG. 7 is a structural block diagram of a channel matrix processing apparatus according to another embodiment of the present disclosure.

Detailed ways

The text will be described in detail below with reference to the accompanying drawings in conjunction with the embodiments. It should be noted that the terms "first", "second" and the like in the specification and claims of the present specification and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or order.

The method embodiments provided by the embodiments of the present application may be implemented in a mobile terminal, a computer terminal, or the like. Taking a mobile terminal as an example, FIG. 2 is a hardware structural block diagram of a mobile terminal according to a channel matrix processing method provided by an embodiment of the present invention. As shown in FIG. 2, the mobile terminal 20 may include at least one (only one shown) processor 202, which may include, but is not limited to, a microprocessor such as a Micro Controller Unit (MCU), or may A programming device such as a processing device of a Field-Programmable Gate Array (FPGA), a memory 204 for storing data, and a transmission device 206 for implementing a communication function. The structure shown in FIG. 2 is merely illustrative and does not limit the structure of the above electronic device. For example, the mobile terminal 20 may also include more or fewer components than those shown in FIG. 2, or have a different configuration than that shown in FIG. 2.

The memory 204 can be used to store software programs and modules of application software, such as program instructions/modules corresponding to the channel matrix processing method in the embodiment, and the processor 202 executes various programs by running software programs and modules stored in the memory 204. Functional application and data processing, that is, the above method is implemented. Memory 204 can include high speed random access memory and can also include non-volatile memory, such as at least one magnetic storage device, flash memory, or other non-volatile solid state memory. In some examples, memory 204 may also include memory remotely located relative to processor 202, which may be connected to mobile terminal 20 over a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

Transmission device 206 is for receiving or transmitting data via a network. The above specific network example may include a wireless network provided by a communication provider of the mobile terminal 20. In one example, transmission device 206 includes a Network Interface Controller (NIC) that can be connected to other network devices through a base station to communicate with the Internet. In one example, the transmission device 206 can be a Radio Frequency (RF) module configured to communicate with the Internet wirelessly.

In this embodiment, a channel matrix processing method for the mobile terminal is provided. FIG. 3 is a flowchart of a channel matrix processing method according to an embodiment of the present disclosure. As shown in FIG. 3, the process includes the step S302. S304 and step S306.

In step S302, the signaling transmitted by the maximum ratio transmission MRT controller is received, wherein the signaling is set to indicate an identifier of the line pair that exits the predetermined packet and an identifier of the predetermined packet, or a line pair indicating the entry into the predetermined packet The identification and the identification of the predetermined grouping.

In step S304, a precoding coefficient matrix is acquired according to the identifier of the line pair and the identifier of the predetermined group.

In step S306, the MRT channel matrix is diagonalized by a precoding coefficient matrix, which is generated by the MRT precoder according to the MRT precoding matrix and the far end crosstalk FEXT channel matrix, and the MRT channel matrix The number of rows and columns are the number of CPEs that activate the client terminal device.

Through the above steps, the vector control unit (VCE) receives the signaling sent by the MRT controller, determines that the wired pair enters or exits the predetermined packet, and obtains the precoding coefficient according to the identifier of the pair and the identifier of the predetermined group. a matrix, such that the MRT channel matrix sent by the MRT precoder can be diagonalized according to the obtained latest precoding coefficient matrix to eliminate crosstalk between groups, that is, between channels corresponding to the client terminal device CPE Crosstalk. That is to say, through the cooperative processing of the MRT controller and the VCE, the elimination of crosstalk between groups when the wired pair "enters" or "leaves" the group is realized. Therefore, it is possible to avoid the phenomenon that the crosstalk between groups cannot be eliminated when the wired pair "enters" or "leaves" the group in the related art, and the crosstalk elimination effect is achieved.

In an embodiment, the MRT controller can also signal to the VCE which line pairs are assigned to group_1 and which pairs are assigned to group_M.

In an embodiment, acquiring the precoding coefficient matrix according to the identifier of the pair and the identifier of the predetermined grouping comprises: determining the dimension of the precoding coefficient matrix according to the identifier of the pair and the identifier of the predetermined group; and using the vectorization algorithm and the dimension Number, get the matrix of precoding coefficients.

In an embodiment, determining the dimension of the precoding coefficient matrix according to the identifier of the pair and the identifier of the predetermined group, comprising at least one of: setting the signaling to indicate the line pair indicating the exit of the predetermined group and the pair In the case of a pair of pairs corresponding to the idle CPE, or indicating the identification of the pair of lines entering the predetermined packet and the line pair is the line pair corresponding to the idle CPE, the dimension of the precoding coefficient matrix is equal to the number of exits without the line pair The dimension of the precoding coefficient matrix at the time of the predetermined packet, or the dimension of the precoding coefficient matrix when no pair of lines enters the predetermined packet; the signaling is set to indicate the identity of the pair of lines that exit the predetermined packet and the line pair is activated In the case of a pair of pairs corresponding to the CPE, the dimension of the precoding coefficient matrix is reduced by one row or one column on the basis of the dimension of the precoding coefficient matrix when no line pair exits the predetermined packet, or enters a predetermined group without a pair of lines When the dimension of the precoding coefficient matrix is reduced, one row and one column are reduced.

In the embodiment, a channel matrix processing method is also provided, and FIG. 4 is a flowchart of a channel matrix processing method according to an embodiment of the present disclosure. As shown in FIG. 4, the process includes step S402. Step S404 and step S406.

In step S402, the signaling transmitted by the maximum ratio transmission MRT controller is received, wherein the signaling is set to indicate an identifier of the line pair that exits the predetermined packet and an identifier of the predetermined packet, or a line pair indicating the entry into the predetermined packet The identity of the identity and the predetermined grouping.

In step S404, an MRT precoding matrix is acquired according to the identifier of the pair and the identifier of the predetermined group.

In step S406, an MRT channel matrix is generated according to the MRT precoding matrix and the far-end crosstalk FEXT channel matrix, and the MRT channel matrix is sent to the vector control unit VCE, so that the VCE diagonalizes the MRT channel matrix, where the MRT The number of rows and columns of the channel matrix are the number of CPEs that activate the client terminal device.

In an embodiment, generating the MRT channel matrix according to the MRT precoding matrix and the far-end crosstalk FEXT channel matrix comprises: acquiring an intermediate MRT channel matrix according to the MRT precoding matrix and the far-end crosstalk FEXT channel matrix; by corresponding to the idle CPE The MRT channel matrix is generated by eliminating the column vectors from the intermediate MRT channel matrix.

In an embodiment, according to the identifier of the pair and the identifier of the predetermined group, the acquiring the MRT precoding matrix comprises at least one of: setting the signaling to indicate the line pair indicating the exit of the predetermined group, and the line pair is the corresponding to the idle CPE. In the case of a pair of lines, the MRT precoding matrix is reduced by one column based on the MRT precoding matrix when no line pair exits the predetermined packet, or is reduced on the basis of the MRT precoding matrix when no pair of lines enters a predetermined packet a column, wherein the reduced column is a column corresponding to the pair of wires exiting the predetermined packet; in the case where the signaling is set to indicate the identity of the pair entering the predetermined packet and the pair is the pair corresponding to the idle CPE, the MRT precoding The matrix adds a column to the MRT precoding matrix when no line pair exits the predetermined packet, or adds a column to the MRT precoding matrix when no pair of lines enters the predetermined packet, wherein the added column is entered. a column corresponding to the pair of the predetermined group; in the case where the signaling is set to indicate the identification of the pair of the line that exits the predetermined group and the line pair is the line pair corresponding to the activated CPE, the line is closed Determining the transmit port of all pairs in the packet, the MRT precoding matrix is to reduce a row on the basis of the MRT precoding matrix when no pair of lines exits the predetermined packet and reduce the number of columns with the same number of pairs in the predetermined packet, or Decreasing a row on the basis of the MRT precoding matrix when no pair of lines enters the predetermined packet and reducing the number of columns in which the number of pairs in the predetermined packet is equal, wherein the reduced behavior is a row corresponding to the predetermined packet, and the reduced column is a predetermined pair of midline pairs. Corresponding column.

To facilitate the understanding of the above embodiments, the following is an example. FIG. 5 is a schematic diagram of a precoding processing architecture according to an embodiment of the present invention. As shown in FIG. 5, an MRT precoder and an MRT controller are added to the original precoding processing architecture. And an MRT_c control interface is added between the MRT controller and the MRT precoding, and an MRT_VCE_c control interface is added between the MRT controller and the VCE. M is the number of groups. For convenience of explanation, it is assumed that M = 2; N is the total number of pairs including the active pair and the idle pair, assuming N = 3. CPE_1 and CPE_3 are active user terminals, line pair 1 and line pair 3 are the line pairs where the active user is located; CPE_2 is the idle user terminal, line pair 2 is the line pair where the idle user is located; MRT controller determines line pair 1 and line pair 2 is assigned to group group_1, and line pair 3 is assigned to group_2.

The signal processing process of the MRT precoder and FEXT precoder is as follows:

The FEXT channel matrix is a 3*3 matrix.

The MRT precoding matrix is a 2*3 matrix.

Among them, the line pair really cares about the column vector where the activation user 1 and the activation user 3 are located, that is, the column vector 1 and the column vector 3 of the above formula (2). The column vector 2 of the above equation (2) is eliminated, which is the MRT channel matrix H _MRT . H _MRT is a 2*2 matrix.

VCE then obtains the precoding matrix PD through the vectoring algorithm to make the HMRT diagonal, thus eliminating the crosstalk between the group1 and group2 vector groups:

The above formula (3) is the result of co-processing of the MRT precoder and the FEXT precoder, that is, the result of the MRT controller cooperating with the VCT.

In an embodiment, the MRT controller may only need to inform the VCE which line pairs are allocated in group_1 and which line pairs are allocated in group_M.

In an embodiment, the newly added MRT controller does not affect the VCE's control of the FEXT precoder, and the VCE is still processed in accordance with the "join" or "release" process specified in G.993.5.

In an embodiment, when the SNR of a certain tone coupled to the active pair is greater than a threshold, the MRT controller may determine that the pair corresponding to the tone is activated.

In an embodiment, when the MRT controller determines that a new pair of idle lines, such as line pair 2, is allocated to group_1, the MRT precoding matrix dimension of the group_1 is correspondingly increased by one column; after the VCE recalculates the precoding coefficient , tells the FEXT precoder, but the dimension of the precoding coefficient matrix remains unchanged.

In an embodiment, the current idle line pair, such as line pair 2, exits the original group_1 because of the change in SNR, and the MRT precoding matrix dimension of group_1 is correspondingly reduced by one column; similarly, the current idle line When 2 is added to group_2 because of SNR change, the MRT precoding matrix dimension of this group_2 is increased by one column accordingly; after the VCE recalculates the precoding coefficient, the FEXT precoder is notified, but the dimension of the precoding coefficient matrix remains unchanged.

In an embodiment, when the current pair is released or suddenly dropped, if the current pair is the pair 1 of the active user, the MRT controller needs to wait for a certain length of time. If it still cannot be synchronized or restored, then The transmit port of all pairs in the group_1 where the user is activated is turned off; or some of the line pairs in group_1 can be added to group_2, and the MRT precoding matrix dimension of the group_2 is increased by one column; the VCE recalculates the precoding coefficient. , tells the FEXT precoder, but the dimension of the precoding coefficient matrix remains unchanged. After the VCE recalculates the precoding coefficients, the FEXT precoder is informed, and the dimension of the precoding coefficient matrix needs to be reduced by one row and one column.

The following describes the entry of the group line_1 and the exit group group_1 from the above-mentioned idle line pair 2, respectively.

In scenario 1, the idle line pair 2 exits group_1.

Step 1. The FEXT channel matrix is rolled back into a 2*2 matrix.

Step 2: The MRT controller transmits signaling to inform the MRT precoder that the dimension of the MRT precoding matrix is correspondingly reduced by one column to become a 2*2 matrix.

Step 3, the MRT channel matrix H _{MRT is} still a 2*2 matrix, indicating the crosstalk between the group where the active user 1 and the activated user 3 are located:

In step 4, the MRT controller notifies the VCE by signaling that the line pair 2 currently exiting group_1 is an idle line pair, so the dimension of the precoding coefficient matrix P _D remains unchanged. VCE then obtains the precoding coefficient matrix P _D through the vectoring algorithm, which makes the H _MRT diagonalized, thus eliminating the crosstalk between the group1 and group2 vector groups:

The above steps are the result of co-processing of the MRT precoder and the FEXT precoder.

In scenario 2, after the idle line pair 2 exits group_1, it enters group_2.

Step 1. According to the first embodiment, the FEXT channel matrix is first rolled back into a 2*2 matrix, and then restored to a 3*3 matrix.

Step 2: The MRT controller transmits signaling to inform the MRT precoder that the dimension of the MRT precoding matrix is increased by one column from the original 2*2 matrix to become a 2*3 matrix, and the MRT precoding matrix is a 2* 3 matrix,

Step 3: In the above formula, the line pair really cares about the column vector in which the user 1 and the activation user 3 are activated, that is, the column vector 1 and the column vector 3 of the above formula. The column vector 2 of the above formula is eliminated, which is the MRT channel matrix H _MRT , and H _MRT is a 2*2 matrix.

In step 4, the MRT controller notifies the VCE by signaling that the pair 2 of the current group_2 is an idle pair, so the dimension of the precoding coefficient matrix P _D remains unchanged. VCE then obtains the precoding matrix P _D through the vectoring algorithm, which makes the H _MRT diagonalized, thus eliminating the crosstalk between the group1 and group2 vector groups:

The above step is the result of co-processing of the MRT precoder and the FEXT precoder.

The following describes the exit group group_1 from the above-mentioned active line pair 1.

In scenario 3, the line pair 1 that activates the user exits group_1, and the idle line pair 2 does not enter group_2.

Step 1. The line pair that is currently released or suddenly dropped is the line pair 1 where the user is activated. Then the MRT controller needs to wait for a certain length of time. If it still cannot be synchronized or restored, all the transmitting ports of group_1 are closed, and group_1 is cancelled. The FEXT channel is rolled back into a 1*1 matrix, H = [H ₃₃ ].

Step 2: The MRT controller transmits signaling to inform the MRT precoder that the number of rows of the MRT precoding matrix is reduced to the number of group packets, and the number of columns of the MRT precoding matrix is correspondingly reduced to the number of pairs in the group_2, becoming a 1 *1 matrix,

P _MRT × H = [|H ₃₃ | ² ].

Step 3, H _MRT falls back to a 1*1 matrix, because group_1 cross-packet crosstalk for active user 3 no longer exists, H _MRT =[|H ₃₃ | ² ].

Step 4: The MRT controller notifies the VCE by signaling that the line pair 1 currently exiting group_1 is the pair of the active user, so the dimension of the _PD is reduced by one row and one column. VCE then obtains the precoding matrix P _D through the vectoring algorithm to make the H _MRT diagonal, P _D ×H _MRT =[|H ₃₃ | ² ].

In scenario 4, the line pair 1 that activates the user exits group_1, and the idle line pair 2 enters group_2.

Step 1. The line pair that is currently released or suddenly dropped is the line pair 1 where the user is activated. Then the MRT controller needs to wait for a certain length of time. If it still cannot be synchronized or restored, cancel group_1 and turn off the DPU transmission of the active line pair 1. Port, but does not close the DPU transmit port of idle line pair 2, the FEXT channel is rolled back into a 2*2 matrix,

Step 2: The MRT controller transmits signaling to inform the MRT precoder that the number of rows of the MRT precoding matrix is reduced to the number of group packets, and the number of columns of the MRT precoding matrix is correspondingly reduced to the number of pairs in the group_2, becoming a 1 *2 matrix,

Step 3: In the above equation, the line pair really cares about the signal power coupled to the activated user 3, that is, the column vector 2 of the above formula. The column vector 1 of the above formula is eliminated, which is H _MRT . H _MRT falls back to a 1*1 matrix, and group_1 does not exist for crosstalk between groups that activate user 3.

Step 4: The MRT controller notifies the VCE by signaling that the line pair 1 currently exiting group_1 is the pair of the active user, so the dimension of the _PD is reduced by one row and one column. VCE then obtains the precoding matrix P _D through the vectoring algorithm to make the H _MRT diagonalized.

Through the description of the above embodiments, those skilled in the art can understand that the method according to the foregoing embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware. The technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, disk, CD), and includes several instructions. To enable a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods described in the various embodiments herein.

Example 2

In the embodiment, a channel matrix processing device device is also provided, which is configured to implement the above-described embodiments, and the description thereof has been omitted. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. The apparatus described in the following embodiments can be implemented in software, but hardware, or a combination of software and hardware, is also possible and conceivable.

6 is a block diagram of a structure of a channel matrix processing apparatus according to an embodiment of the present invention. As shown in FIG. 6, the apparatus includes a receiving module 602, an obtaining module 604, and a processing module 606.

The receiving module 602 is configured to receive a signaling that is sent by the maximum transmission MRT controller, where the signaling is set to indicate an identifier of the pair of the exiting the predetermined packet and an identifier of the predetermined packet, or an identifier indicating the pair of the entry into the predetermined packet The identifier of the predetermined group.

The obtaining module 604 is connected to the receiving module 602, and is configured to obtain a matrix of precoding coefficients according to the identifier of the pair and the identifier of the predetermined group.

The processing module 606 is coupled to the obtaining module 604, and configured to diagonalize the MRT channel matrix by using a matrix of precoding coefficients, wherein the MRT pre-encoder is based on the MRT precoding matrix and the far-end crosstalk FEXT channel matrix. The number of rows and columns of the generated MRT channel matrix are the number of activated client terminal devices CPE.

In an embodiment, the obtaining module 604 is further configured to determine a dimension of the precoding coefficient matrix according to the identifier of the pair and the identifier of the predetermined group; and obtain the matrix of the precoding coefficient by using a vectorization algorithm and a dimension.

7 is a block diagram 2 of a structure of a channel matrix processing apparatus according to an embodiment of the present invention. As shown in FIG. 7, the apparatus includes a receiving module 702, an obtaining module 704, and a generating module 706.

The receiving module 702 is configured to receive the signaling sent by the maximum ratio transmission MRT controller, where the signaling is set to indicate the identifier of the pair of the exiting the predetermined packet and the identifier of the predetermined packet, or the identifier of the pair indicating the entry into the predetermined packet The identifier of the predetermined group.

The obtaining module 704 is connected to the receiving module 702, and is configured to acquire an MRT precoding matrix according to the identifier of the pair and the identifier of the predetermined group.

The generating module 706 is connected to the obtaining module 704, configured to generate an MRT channel matrix according to the MRT precoding matrix and the far-end crosstalk FEXT channel matrix, and send the MRT channel matrix to the vector control unit VCE, so that the VCE performs the MRT channel matrix. The diagonalization process, wherein the number of rows and the number of columns of the MRT channel matrix are both the number of activated client terminal devices CPE.

In an embodiment, the generating module 706 is further configured to obtain an intermediate MRT channel matrix according to the MRT precoding matrix and the far-end crosstalk FEXT channel matrix; and remove the column vector corresponding to the idle CPE from the intermediate MRT channel matrix, Generate an MRT channel matrix.

It should be noted that each of the foregoing modules may be implemented by software or hardware. For the latter, the foregoing may be implemented by, but not limited to, the foregoing modules are located in the same processor; or, the foregoing modules are in any combination. The forms are located in different processors.

Example 3

Embodiments herein also provide a storage medium comprising a stored program, wherein the program described above executes the method of any of the above.

In an embodiment, in the embodiment, the storage medium may be configured to store program code set to perform the following steps: S1, receiving a maximum transmission ratio signaling sent by the MRT controller, wherein the signaling is set to indicate Deleting the identifier of the pair of the predetermined packet and the identifier of the predetermined packet, or indicating the identifier of the pair entering the predetermined packet and the identifier of the predetermined packet; S2, acquiring the matrix of the precoding coefficient according to the identifier of the pair and the identifier of the predetermined group; And diagonalizing the MRT channel matrix by the precoding coefficient matrix, wherein the MRT precoder is generated according to the MRT precoding matrix and the far end crosstalk FEXT channel matrix, and the number and columns of the MRT channel matrix The number is the number of CPEs that activate the client terminal equipment.

In an embodiment, the storage medium is further arranged to store program code for performing the steps of: obtaining the precoding coefficient matrix according to the identification of the pair and the identification of the predetermined grouping comprising: S1, according to the identification of the pair and the predetermined grouping The identifier determines the dimension of the precoding coefficient matrix; S2, obtains the precoding coefficient matrix by the vectorization algorithm and the dimension.

In an embodiment, the storage medium is further configured to store program code for performing the steps of: determining, according to the identification of the pair of lines and the identification of the predetermined group, the dimension of the matrix of precoding coefficients comprising at least one of: S1, The signaling is set to indicate the identity of the pair of the line that exits the predetermined packet and the pair is the pair of lines corresponding to the idle CPE, or the identifier of the pair that indicates the entry into the predetermined group and the pair is the pair corresponding to the idle CPE In the case, the dimension of the precoding coefficient matrix is equal to the dimension of the precoding coefficient matrix when no pair of lines exits the predetermined packet, or the dimension of the precoding coefficient matrix when no pair of lines enters the predetermined group; S2, When the signaling is set to indicate the identity of the pair of the line that exits the predetermined packet and the line pair is the pair of lines corresponding to the activated CPE, the dimension of the precoding coefficient matrix is the precoding coefficient matrix when no line pair exits the predetermined group The number of rows is reduced by one row or one column, or one row and one column are reduced on the basis of the dimension of the precoding coefficient matrix when no pair of lines enters the predetermined group.

In an embodiment, in the embodiment, the storage medium may be configured to store program code for performing the following steps: S1, receiving a maximum transmission ratio signaling sent by the MRT controller, wherein the signaling is set to indicate Deleting the identifier of the pair of the predetermined packet and the identifier of the predetermined packet, or indicating the identifier of the pair entering the predetermined packet and the identifier of the predetermined packet; S2, acquiring the MRT precoding matrix according to the identifier of the pair and the identifier of the predetermined packet; S3 Generating an MRT channel matrix according to the MRT precoding matrix and the far-end crosstalk FEXT channel matrix, and transmitting the MRT channel matrix to the vector control unit VCE, so that the VCE diagonalizes the MRT channel matrix, wherein the row of the MRT channel matrix The number of columns and the number of columns are the number of CPEs that activate the client terminal device.

In an embodiment, in the embodiment, the storage medium may be configured to store program code for performing the following steps: generating an MRT channel matrix according to the MRT precoding matrix and the far-end crosstalk FEXT channel matrix, including: S1, Obtaining an intermediate MRT channel matrix according to the MRT precoding matrix and the far-end crosstalk FEXT channel matrix; S2, generating an MRT channel matrix by removing a column vector corresponding to the idle CPE from the intermediate MRT channel matrix.

In an embodiment, in the embodiment, the storage medium may be configured to store program code for performing the following steps: acquiring the MRT precoding matrix according to the identifier of the pair and the identifier of the predetermined group, including at least one of the following : S1, in the case where the signaling is set to indicate the identity of the pair of lines exiting the predetermined packet and the pair is the pair corresponding to the idle CPE, the MRT precoding matrix is the MRT precoding when no line pair exits the predetermined packet One column is reduced on the basis of the matrix, or one column is reduced on the basis of the MRT precoding matrix when no pair of lines enters the predetermined group, wherein the reduced column is the column corresponding to the pair of lines that exit the predetermined group; S2, in the signaling setting In order to indicate the identity of the pair entering the predetermined packet and the pair is the pair corresponding to the idle CPE, the MRT precoding matrix adds a column to the MRT precoding matrix when no line pair exits the predetermined packet, Or adding a column to the MRT precoding matrix when no pair of lines enters the predetermined group, wherein the added column is a column corresponding to the pair of lines entering the predetermined group; S3 In the case that the signaling is set to indicate the identity of the pair of the line that exits the predetermined packet and the line pair is the pair of lines corresponding to the activated CPE, the transmitting port of all the pairs in the predetermined group is closed, and the MRT precoding matrix is exited without the pair Decreasing a row on the basis of the MRT precoding matrix at the time of the predetermined packet and reducing the number of columns having the same number of line pairs in the predetermined packet, or reducing one line and reducing the number of lines on the basis of the MRT precoding matrix when the line pair enters the predetermined packet The number of columns in the predetermined group has the same number of pairs of lines, wherein the reduced behavior is the row corresponding to the predetermined group, and the reduced column is the column corresponding to the pair of lines in the predetermined group.

In an embodiment, in the embodiment, the foregoing storage medium may include, but is not limited to, a USB flash drive, a read-only memory (ROM), a random access memory (RAM), and a mobile hard disk. A variety of media that can store program code, such as a disk or a disc.

Embodiments herein also provide a processor configured to execute a program, wherein the program, when executed, performs the steps of any of the above methods.

In an embodiment, in the embodiment, the foregoing program is configured to perform the following steps: S1, receiving a signaling that is sent by a maximum ratio transmission MRT controller, where the signaling is set to indicate an identifier of a line pair that exits the predetermined packet. An identifier of the predetermined packet, or an identifier indicating a line pair entering the predetermined packet and an identifier of the predetermined group; S2, acquiring a matrix of precoding coefficients according to the identifier of the pair and the identifier of the predetermined group; S3, by using a precoding coefficient matrix pair The MRT channel matrix is diagonalized, wherein the MRT channel matrix is generated by the MRT precoder according to the MRT precoding matrix and the far-end crosstalk FEXT channel matrix, and the number of rows and columns of the MRT channel matrix are activated client terminal devices. The number of CPEs.

In an embodiment, in the embodiment, the foregoing program is configured to perform the following steps: acquiring the precoding coefficient matrix according to the identifier of the pair and the identifier of the predetermined group, comprising: S1, according to the identifier of the pair and the identifier of the predetermined group Determining the dimension of the precoding coefficient matrix; S2, obtaining a matrix of precoding coefficients by using a vectorization algorithm and a dimension.

In an embodiment, in the embodiment, the above program is configured to perform the following steps: determining, according to the identifier of the pair and the identifier of the predetermined group, the dimension of the matrix of precoding coefficients comprises at least one of the following: S 1, in the letter The case is set to indicate the identification of the pair of the line that exits the predetermined packet and the line pair is the pair of lines corresponding to the idle CPE, or the indication of the line pair entering the predetermined group and the line pair is the line pair corresponding to the idle CPE The dimension of the precoding coefficient matrix is equal to the dimension of the precoding coefficient matrix when no pair of lines exits the predetermined group, or the dimension of the precoding coefficient matrix when no pair of lines enters the predetermined group; S2, in the letter In the case where the identifier is set to indicate the line pair of the exiting predetermined packet and the line pair is the pair of lines corresponding to the activated CPE, the dimension of the precoding coefficient matrix is a matrix of precoding coefficients when no pair of lines exits the predetermined group The number of rows and columns is reduced on the basis of the dimension, or one row and one column are reduced on the basis of the dimension of the precoding coefficient matrix when no pair of lines enters the predetermined group.

In an embodiment, in the embodiment, the above program is configured to perform the following steps: S1, receiving a signaling that is transmitted by a maximum ratio transmission MRT controller, wherein the signaling is set to indicate an identifier of a pair of lines that exit the predetermined packet. An identifier of the predetermined packet, or an identifier indicating a line pair entering a predetermined packet and an identifier of a predetermined packet; S2, acquiring an MRT precoding matrix according to the identifier of the pair and the identifier of the predetermined group; S3, according to the MRT precoding matrix and The far-end crosstalk FEXT channel matrix generates an MRT channel matrix and sends the MRT channel matrix to the vector control unit VCE, so that the VCE diagonalizes the MRT channel matrix, wherein the number of rows and columns of the MRT channel matrix are activated. The number of CPEs of the client terminal equipment.

In an embodiment, in the embodiment, the foregoing program is configured to perform the following steps: generating an MRT channel matrix according to the MRT precoding matrix and the far-end crosstalk FEXT channel matrix, including: S1, according to the MRT precoding matrix and the far end Crosstalking the FEXT channel matrix to obtain an intermediate MRT channel matrix; S2, generating an MRT channel matrix by culling the column vector corresponding to the idle CPE from the intermediate MRT channel matrix.

In an embodiment, in the embodiment, the foregoing program is configured to perform the following steps: according to the identifier of the pair and the identifier of the predetermined group, the acquiring MRT precoding matrix comprises at least one of the following: S1, the signaling is set to indicate In the case of exiting the identification of the pair of the predetermined packet and the pair is the pair corresponding to the idle CPE, the MRT precoding matrix is reduced by one column based on the MRT precoding matrix when no line pair exits the predetermined packet, or No line pair is reduced by one column based on the MRT precoding matrix when entering the predetermined packet, wherein the reduced column is a column corresponding to the line pair exiting the predetermined packet; S2, the signaling is set to indicate the line pair entering the predetermined packet In the case where the identified and the pair is the pair corresponding to the idle CPE, the MRT precoding matrix is added to the MRT precoding matrix when no line pair exits the predetermined packet, or when no pair is entering the predetermined packet. Adding a column to the MRT precoding matrix, wherein the added column is a column corresponding to the pair of lines entering the predetermined group; S3, the signaling is set to indicate the exit of the predetermined point In the case of the identification of the pair of lines and the pair of lines corresponding to the CPE, the transmission ports of all pairs in the predetermined group are closed, and the MRT precoding matrix is the MRT precoding matrix when no line pair exits the predetermined group. Decreasing a row and reducing the number of columns with the same number of pairs of lines in the predetermined packet, or reducing a row on the basis of the MRT precoding matrix when no pair of lines enters the predetermined packet and reducing the number of columns having the same number of pairs in the predetermined grouping, Wherein, the reduced behavior is a row corresponding to the predetermined group, and the reduced column is a column corresponding to the pair of lines in the predetermined group.

For specific examples in this embodiment, reference may be made to the foregoing embodiments, and details are not described herein again. The various modules or steps herein may be implemented by a general purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices. In one embodiment, they may be used The program code executable by the computing device is implemented such that they can be stored in the storage device by the computing device, and in some cases, the steps shown or described can be performed in a different order than herein. Alternatively, they may be fabricated into individual integrated circuit modules, or a plurality of modules or steps may be fabricated into a single integrated circuit module. As such, this article is not limited to any specific combination of hardware and software.

Claims

A channel matrix processing method includes:

Receiving a signaling that is transmitted by the maximum transmission MRT controller, wherein the signaling is set to indicate an identifier of a pair of lines that exit the predetermined packet and an identifier of the predetermined packet, or an indication of a pair of lines entering the predetermined packet The identifier of the predetermined grouping;

Obtaining a precoding coefficient matrix according to the identifier of the pair and the identifier of the predetermined group;

And diagonalizing the MRT channel matrix by the matrix of precoding coefficients, wherein the MRT channel matrix is generated by the MRT precoder according to the MRT precoding matrix and the far end crosstalk FEXT channel matrix, and the MRT The number of rows and columns of the channel matrix is the number of CPEs that activate the client terminal device.
The method according to claim 1, wherein the obtaining the matrix of precoding coefficients according to the identifier of the pair and the identifier of the predetermined group comprises:

Determining a dimension of the precoding coefficient matrix according to the identifier of the pair and the identifier of the predetermined group;

The matrix of precoding coefficients is obtained by a vectorization algorithm and the dimension.
The method of claim 2, wherein determining the dimension of the matrix of precoding coefficients comprises at least one of: based on the identification of the pair of lines and the identification of the predetermined grouping:

The signaling is set to indicate an identifier of a line pair that exits a predetermined packet and the line pair is a line pair corresponding to an idle CPE, or an identifier indicating a line pair entering the predetermined packet and the line pair is an idle CPE corresponding to In the case of a pair of lines, the dimension of the matrix of precoding coefficients is equal to the dimension of the matrix of precoding coefficients when no pair of lines exits the predetermined group, or the matrix of precoding coefficients when no pair of lines enters the predetermined group Dimension

In the case where the signaling is set to indicate the identity of the pair of lines exiting the predetermined packet and the pair is the pair of lines corresponding to the activated CPE, the dimension of the matrix of precoding coefficients is to exit the reservation without a pair of lines The row of the precoding coefficient matrix at the time of grouping is reduced by one row and one column, or one row and one column are reduced on the basis of the dimension of the precoding coefficient matrix when no pair of lines enters the predetermined packet.
A channel matrix processing method includes:

Receiving a signaling that is transmitted by the maximum transmission MRT controller, wherein the signaling is set to indicate an identifier of a pair of lines that exit the predetermined packet and an identifier of the predetermined packet, or an indication of a pair of lines entering the predetermined packet The identifier of the predetermined grouping;

Obtaining an MRT precoding matrix according to the identifier of the pair and the identifier of the predetermined group;

Generating an MRT channel matrix according to the MRT precoding matrix and the far-end crosstalk FEXT channel matrix, and transmitting the MRT channel matrix to a vector control unit VCE, so that the VCE diagonalizes the MRT channel matrix, The number of rows and columns of the MRT channel matrix is the number of activated client terminal devices CPE.
The method according to claim 4, wherein generating the MRT channel matrix according to the MRT precoding matrix and the far-end crosstalk FEXT channel matrix comprises:

Obtaining an intermediate MRT channel matrix according to the MRT precoding matrix and the far-end crosstalk FEXT channel matrix;

The MRT channel matrix is generated by culling the column vector corresponding to the idle CPE from the intermediate MRT channel matrix.
The method according to claim 4, wherein the acquiring the MRT precoding matrix comprises at least one of the following according to the identification of the pair and the identification of the predetermined group:

In a case where the signaling is set to indicate an identifier of a pair of lines exiting a predetermined packet and the pair is a pair corresponding to an idle CPE, the MRT precoding matrix is when no pair of lines exits the predetermined group Decreasing a column based on the MRT precoding matrix, or reducing a column based on the MRT precoding matrix when no pair of lines enters the predetermined packet, wherein the reduced column is a column corresponding to the pair of lines exiting the predetermined grouping ;

In the case where the signaling is set to indicate the identity of the pair entering the predetermined packet and the pair is the pair corresponding to the idle CPE, the MRT precoding matrix is when no pair is exiting the predetermined packet Adding a column based on the MRT precoding matrix or adding a column to the MRT precoding matrix when no pair of lines enters the predetermined packet, wherein the added column is a column corresponding to the pair of lines entering the predetermined grouping ;

In a case where the signaling is set to indicate an identifier of a pair of lines exiting a predetermined packet and the pair is a pair of pairs corresponding to the activated CPE, the transmitting port of all pairs in the predetermined group is closed, the MRT precoding The matrix is a row that reduces one row and reduces the number of columns in the predetermined packet on the basis of the MRT precoding matrix when no pair of lines exits the predetermined packet, or MRT pre-selection when no pair of lines enters the predetermined packet The row is reduced by one line and the number of columns having the same number of pairs of lines in the predetermined group is reduced, wherein the reduced behavior is the row corresponding to the predetermined group, and the reduced column is the column corresponding to the pair of lines in the predetermined group.
A channel matrix processing apparatus includes:

a receiving module, configured to receive a signal transmitted by a maximum transmission MRT controller, wherein the signaling is set to indicate an identifier of a line pair that exits the predetermined packet and an identifier of the predetermined packet, or a line pair indicating a predetermined packet is entered Identification and identification of the predetermined grouping;

Obtaining a module, configured to acquire a precoding coefficient matrix according to the identifier of the line pair and the identifier of the predetermined group;

And a processing module, configured to perform diagonalization processing on the MRT channel matrix by using the precoding coefficient matrix, where the MRT channel matrix is generated by the MRT precoder according to the MRT precoding matrix and the far end crosstalk FEXT channel matrix And the number of rows and columns of the MRT channel matrix is the number of activated client terminal devices CPE.
The apparatus according to claim 7, wherein the obtaining module is further configured to determine a dimension of the precoding coefficient matrix according to the identifier of the line pair and the identifier of the predetermined group; by using a vectorization algorithm and the Dimension, obtaining the matrix of precoding coefficients.
A channel matrix processing device, comprising:

a receiving module, configured to receive a signal transmitted by a maximum transmission MRT controller, wherein the signaling is set to indicate an identifier of a line pair that exits the predetermined packet and an identifier of the predetermined packet, or a line pair indicating a predetermined packet is entered Identification and identification of the predetermined grouping;

Obtaining a module, configured to acquire an MRT precoding matrix according to the identifier of the line pair and the identifier of the predetermined group;

Generating a module, configured to generate an MRT channel matrix according to the MRT precoding matrix and the far-end crosstalk FEXT channel matrix, and send the MRT channel matrix to a vector control unit VCE, so that the VCE performs the MRT channel matrix The diagonalization process, wherein the number of rows and columns of the MRT channel matrix is the number of activated client terminal devices CPE.
The apparatus according to claim 9, wherein the generating module is further configured to acquire an intermediate MRT channel matrix according to the MRT precoding matrix and the far-end crosstalk FEXT channel matrix; by using a column vector corresponding to the idle CPE The MRT channel matrix is generated in a manner of culling in the intermediate MRT channel matrix.
A storage medium, the storage medium comprising a stored program, wherein the program is executed to perform the method of any one of claims 1 to 6.
A processor, the processor being arranged to run a program, wherein the program is executed to perform the method of any one of claims 1 to 6.