CN107979390B - Method and device for vectoring system to identify external serial port - Google Patents
Method and device for vectoring system to identify external serial port Download PDFInfo
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- CN107979390B CN107979390B CN201610938732.4A CN201610938732A CN107979390B CN 107979390 B CN107979390 B CN 107979390B CN 201610938732 A CN201610938732 A CN 201610938732A CN 107979390 B CN107979390 B CN 107979390B
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Abstract
The invention provides a method and a device for identifying an external serial port of a vectoring system, which are used for solving the problem that the prior art can not identify the external serial port of the vectoring system, and the method comprises the following steps: determining a first port currently in a link establishment state in a vector group of DISLAM; calculating the crosstalk coefficients of all other ports in the link establishment state to the first port to obtain a crosstalk coefficient combination corresponding to the first port; the external port which is connected in series with the vector group is determined according to all crosstalk coefficients in the crosstalk coefficient combination, and the scheme identifies the port which is connected in series with the vector group according to the crosstalk coefficient characteristics of the port building chain, so that error sampling message data generated by the port in the vector group in the G.993.5 training process are all used for sampling the port in the vectoring system, and therefore, the crosstalk coefficients can be estimated more accurately by using the error sampling messages, and far-end crosstalk noise received by the port of the digital subscriber line access multiplexer can be offset better.
Description
Technical Field
The present invention relates to the field of fixed network communication technologies, and in particular, to a method and an apparatus for a vectoring system to identify an external serial port.
Background
FEXT (Far-End Crosstalk) has been a difficult problem in the field of xDSL (Digital Subscriber Line), but with the increasing maturity of vectorering technology, the trouble caused by Far-End Crosstalk to xDSL will be greatly reduced or even eliminated. In principle, the vectoring technology regards all ports on one or several DSLAMs (Digital Subscriber Line Access multiplexers) as a system, so far-end crosstalk becomes a problem inside a system. The Vectoring technology for xDSL was standardized by ITU-T as early as 2010, and the g.993.5 protocol of ITU-T was released. According to the description of g.993.5, as long as in the line initialization stage, the DSLAM collects ES (Error Sample) messages between ports in the system and reports them to the VCE (vector Control Entity), the VCE estimates crosstalk coefficients using the ES messages, and finally performs matrix operation using a VP (vector processor) chip to cancel crosstalk in the system. In practical application scenarios, possibly due to wiring errors, a few ports may come from outside the vectoring systems, as shown in fig. 1 in the drawings of the specification, DSLAM1 and DSLAM2 are two vectoring systems, DSLAM1 is externally connected with Bundle1, and DSLAM2 is externally connected with Bundle 2. Some ports of Bundle1 are connected to Bundle2, and some ports of Bundle2 are connected to Bundle1, and the wrongly wired ports can be regarded as external ports of vectorring system. Due to the requirements of vectorring technology, ports for crosstalk cancellation must be ports in a system, otherwise, vectorring system deviates from ES estimation, and the deviation of ES causes the crosstalk coefficient to deviate, which finally affects the accuracy of crosstalk cancellation at the far end of the ports in the system.
Disclosure of Invention
The invention provides a method and a device for identifying an external serial port of a vectorization system, which are used for solving the problem that the prior art cannot identify the external serial port of the vectorization system.
According to a first aspect of the present invention, there is provided a method for a vectoring system to identify an external serial port, including: determining a first port currently in a link establishment state in a vector group of DISLAM; calculating the crosstalk coefficients of all other ports in the link establishment state to the first port to obtain a crosstalk coefficient combination corresponding to the first port; and determining the external port which is connected in series to the vector group according to all crosstalk coefficients in the crosstalk coefficient combination.
Further, the method further comprises: before determining the first port currently in the link establishment state in the vector group of the dispam, setting variables of a polling starting port number, the maximum port number supported by the vector group, the port number, and a memory space for storing a crosstalk coefficient.
Calculating crosstalk coefficients of all other ports in a link establishment state to the first port to obtain a crosstalk coefficient combination corresponding to the first port, wherein the crosstalk coefficient combination comprises: under the condition that the port number of the first port is determined to be smaller than the maximum port number supported by the vector group, acquiring the link establishment state of the first port and the transmission mode of the digital subscriber line XDSL from the DISLAM; and acquiring the crosstalk coefficient combination of the first port from the DISLAM under the condition that the first port is in a link establishment state and the transmission mode of the first port is G.993.5.
Wherein, determining the external port which is connected in series to the vector group according to all crosstalk coefficients in the crosstalk coefficient combination comprises: after calculating the crosstalk coefficients of all other ports in the link establishment state to the first port, sequencing according to preset port numbers to perform polling, and calculating the crosstalk coefficient combinations corresponding to all the ports in sequence; accumulating all the calculated crosstalk coefficients in the crosstalk coefficient combinations corresponding to all the ports to obtain all accumulated values corresponding to the crosstalk coefficient combinations; sorting all accumulated values in a descending order; and determining the port corresponding to the accumulated value with the top appointed number in all the ordered accumulated values as the external serial port of the vectorization system, wherein the appointed number is obtained by the product of the total number of all the accumulated values and the preset proportion value.
Wherein, the crosstalk coefficient in the crosstalk coefficient combination obtained at one time does not exceed 384 x 2 bytes.
According to a second aspect of the present invention, there is provided an apparatus for a vectoring system to identify an external ingress port, including: the first determining module is used for determining a first port which is currently in a chain establishment state in a vector group of the DISLAM; the calculation module is used for calculating crosstalk coefficients of all other ports in a link establishment state to the first port to obtain a crosstalk coefficient combination corresponding to the first port; and the second determining module is used for determining the external port which is connected in series to the vector group according to all the crosstalk coefficients in the crosstalk coefficient combination.
Further, the above apparatus further comprises: the device comprises a setting module, a memory space and a polling starting port number, the maximum port number supported by the vector group, the variables of the port number and the memory space, wherein the polling starting port number, the maximum port number supported by the vector group and the memory space are used for storing crosstalk coefficients before the first port in the current link establishment state in the vector group of the DISLAM is determined.
Wherein, the above-mentioned calculation module includes: a first obtaining unit, configured to obtain, when it is determined that the port number of the first port is smaller than the maximum port number supported by the vector group, a link establishment state of the first port and a transmission mode of the digital subscriber line XDSL from the dispam; and the second acquisition unit is used for acquiring the crosstalk coefficient combination of the first port from the DISLAM under the condition that the first port is in a link establishment state and the transmission mode of the first port is G.993.5.
Wherein, the second determining module includes: the polling unit is used for performing polling according to the preset port number sequence after calculating the crosstalk coefficients of all other ports in the link establishment state to the first port, and sequentially calculating the crosstalk coefficient combinations corresponding to all the ports; the accumulation unit is used for accumulating all the calculated crosstalk coefficients in the crosstalk coefficient combinations corresponding to all the ports to obtain all accumulated values corresponding to the crosstalk coefficient combinations; the sorting unit is used for sorting all the accumulated values from small to large; and the third determining unit is used for determining the port corresponding to the accumulated value with the top appointed number in all the ordered accumulated values as the external serial port of the vectorization system, and the appointed number is obtained by the product of the total number of all the accumulated values and the preset proportion value.
Wherein, the crosstalk coefficient in the crosstalk coefficient combination obtained at one time does not exceed 384 x 2 bytes.
The invention has the following beneficial effects:
according to the scheme provided by the embodiment, the ports which are from the outside of the vector group but are strung into the vector group for some reasons are identified according to the crosstalk coefficient characteristics of the port link establishment, so that error sampling message data generated by the ports in the vector group in the g.993.5 training process are guaranteed to be port sampling inside the vectoring system. Therefore, the vectoring control entity can be more accurate when estimating the crosstalk coefficient by using the error sampling message, and far-end crosstalk noise suffered by the digital subscriber line access multiplexer port can be better offset.
Drawings
Fig. 1 is a schematic diagram of a networking in which external port tandem occurs in a scenario in which an xDSL vectoring access scheme is deployed in the related art;
fig. 2 is a flowchart of a method for a vectoring system to identify external ingress ports according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of crosstalk coefficients of other ports in a link setup state to a first port according to the first embodiment of the present invention;
fig. 4 is a flowchart of a method for identifying external serial ports by a vectoring system according to a second embodiment of the present invention;
fig. 5 is a block diagram of an apparatus for identifying an external serial port by a vectoring system in a third embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a method for identifying a port which comes from the outside of a vectored group but is strung into the vectored group for some reasons according to crosstalk coefficient characteristics of a port building chain in a G.993.5 mode on an application scene of an xDSL vectored system deployed at a system level, thereby ensuring that ES (error sampling) message data generated by the port in the vectored group in a G.993.5 training process are all used for sampling the port in the vectored system. Therefore, the VCE can estimate the crosstalk coefficient more accurately by using the ES packet, and far-end crosstalk noise received by the DSLAM port can be better cancelled, and a scheme for identifying an external serial port by the vectoring system provided by the present invention is described below by using a plurality of embodiments.
First embodiment
The present embodiment provides a method for a vectoring system to identify an external serial port, where the method may be executed by a network management device, fig. 2 is a flowchart of the method, and as shown in fig. 2, the method includes the following processing:
step 201: determining a first port currently in a link establishment state in a vector group of DISLAM;
optionally, in this embodiment, before the step 201 is executed, the following processing may be further performed:
before determining the first port currently in the link establishment state in the vector group of the dispam, setting variables of a polling start port number, a maximum port number supported by the vector group, a port number, and a memory space for storing a crosstalk coefficient, and based on the polling start port number therein, determining the first port currently in the link establishment state in the vector group of the dispam.
Step 202: calculating crosstalk coefficients of all other ports in the link establishment state to the first port to obtain a crosstalk coefficient combination corresponding to the first port, as shown in fig. 3;
in this embodiment, the crosstalk coefficient combination corresponding to any one port includes crosstalk coefficients of all other ports in the link establishment state to the current port, where the crosstalk coefficient in the crosstalk coefficient combination obtained at one time is not more than 384 × 2 bytes.
In this embodiment, calculating crosstalk coefficients of all other ports in the link establishment state to the first port to obtain a crosstalk coefficient combination corresponding to the first port may specifically be performed according to the following processing:
under the condition that the port number of the first port is determined to be smaller than the maximum port number supported by the vector group, acquiring a link establishment state (the state comprises two states of being in the link establishment state and not being in the link establishment state) of the first port and a transmission mode of the digital subscriber line XDSL from the DISLAM;
and acquiring the crosstalk coefficient combination of the first port from the DISLAM under the condition that the first port is in a link establishment state and the transmission mode of the first port is G.993.5.
Step 203: and determining the external port which is connected in series to the vector group according to all crosstalk coefficients in the crosstalk coefficient combination.
In this embodiment, the external port that is connected in series to the vector group is determined according to all crosstalk coefficients in the crosstalk coefficient combination, and may specifically be processed as follows:
after calculating the crosstalk coefficients of all other ports in the link establishment state to the first port, sequencing according to preset port numbers to perform polling, and calculating the crosstalk coefficient combinations corresponding to all the ports in sequence; accumulating all the calculated crosstalk coefficients in the crosstalk coefficient combinations corresponding to all the ports to obtain all accumulated values corresponding to the crosstalk coefficient combinations; sorting all accumulated values in a descending order; and determining the port corresponding to the accumulated value with the top appointed number in all the ordered accumulated values as the external serial port of the vectorization system, wherein the appointed number is obtained by the product of the total number of all the accumulated values and the preset proportion value.
According to the scheme provided by the embodiment, the ports which are from the outside of the vector group but are strung into the vector group for some reasons are identified according to the crosstalk coefficient characteristics of the port link establishment, so that error sampling message data generated by the ports in the vector group in the g.993.5 training process are guaranteed to be port sampling inside the vectoring system. Therefore, the vectoring control entity can be more accurate when estimating the crosstalk coefficient by using the error sampling message, and far-end crosstalk noise suffered by the digital subscriber line access multiplexer port can be better offset.
Second embodiment
The present embodiment further explains the method provided by the first embodiment by disclosing more technical features, and fig. 4 is a flowchart of a method for identifying an external serial-in port by a vectoring system provided by a second embodiment of the present invention, as shown in fig. 4, the method includes the following processing:
s101: starting the process;
the entry of the software algorithm engine is on the network management, i.e. the method can be executed by the network management.
S102: DSLAM network management initialization algorithm engine parameters comprise definition and initialization of a start port number at the beginning of polling, setting of maximum port number max _ port _ num supported by a vectoring group, port _ id setting used for identifying a port number and serving as a cycle intermediate variable, port _ id being a port number variable, and application of a memory space which is used for storing a crosstalk coefficient and takes fext _ coef as a head address, wherein the memory space is 384 × 2Byte at most.
S103: the algorithm engine determines whether the port _ id is smaller than the maximum port number max _ port _ num supported by the vectorering group. If the port _ id is smaller than max _ port _ num, entering S104 to continue executing the subsequent flow; if the port _ id is greater than max _ port _ num, it indicates that the network manager has collected the crosstalk coefficients of all the ports currently in the link establishment state (also called in the showtime state) calculated by the DSLAM, where the crosstalk coefficients represent that all other ports are affected by the ports currently in the link establishment state as crosstalk sources, and the network manager has accumulated the crosstalk coefficients corresponding to the ports, and when the processing flow based on the ports is finished, the process needs to enter the flow S110 for processing.
S104: the Network Management issues a snmp (Simple Network Management Protocol) message to acquire the link establishment state of the DISLAM port and the transmission mode of the xDSL line, and after the process is completed, the Network Management acquires the link establishment state of the port with port number port _ id and the line transmission mode.
S106: the algorithm engine determines whether the port is in showtime state and whether the transmission mode is g.993.5.
S107: and the network manager sends the snmp message to the DISLAM to acquire the crosstalk coefficient.
After receiving the message, DISLAM calculates the real and imaginary crosstalk coefficients of all other ports to the port with port number port _ id in the downstream direction. The dilam calculates a module value of the complex number according to the real and imaginary parts, and the module value is characterized in that other ports are used as crosstalk sources to influence the port to be acquired currently at showtime. And after the DISLAM calculation is finished, filling the module values into a data area of the message in sequence according to the format of two bytes of each port, and reporting the data area to a network manager. The network manager acquires no more than 384 x 2 bytes at a time.
S108: and after receiving the data responded by the DISLAM, the algorithm engine stores the data in a memory area of fext _ coef + port _ id 384 x 2.
S109: and accumulating the received crosstalk coefficients of port _ id ports by at most 384 ports by the algorithm engine, and recording the value as SUMport _ id. The process proceeds to S105.
S105: the algorithm engine increments the port _ id by 1 and proceeds to S103. Until all ports have been polled.
S110: the algorithm engine obtains the SUM of at most 384 crosstalk coefficients, which are respectively recorded as SUM0, SUM1 and … SUMmax _ port _ num.
S111: SUM0, SUM1 and … SUMmax _ port _ num are sorted from small to large to obtain an ordered array SUM.
S112: the algorithm engine sets a threshold K%, which is preferably 20%, and selects (from short _ port _ num × K%) ports in the order from small to large starting from the first non-0 value in the ordered array SUM. These ports are treated as strings as external ports to the system.
S113: and the network manager displays the screened ports on a GUI (graphical user interface).
S1134: the flow ends.
Third embodiment
The present embodiment provides an apparatus for a vectoring system to identify an external serial port, fig. 5 is a block diagram of the apparatus, and as shown in fig. 5, the apparatus 50 includes the following components:
a first determining module 51, configured to determine a first port currently in a link establishment state in a vector group of a digital subscriber line access multiplexer dispam;
the calculating module 52 is configured to calculate crosstalk coefficients of all other ports in the link establishment state to the first port, so as to obtain a crosstalk coefficient combination corresponding to the first port;
in this embodiment, the crosstalk coefficient in the crosstalk coefficient combination obtained at one time does not exceed 384 × 2 bytes.
The calculation module 52 may specifically include the following two components:
a first obtaining unit, configured to obtain, when it is determined that the port number of the first port is smaller than the maximum port number supported by the vector group, a link establishment state of the first port and a transmission mode of the digital subscriber line XDSL from the dispam; and the second acquisition unit is used for acquiring the crosstalk coefficient combination of the first port from the DISLAM under the condition that the first port is in a link establishment state and the transmission mode of the first port is G.993.5.
And a second determining module 53, configured to determine the external port that is connected to the vector group in series according to all crosstalk coefficients in the crosstalk coefficient combination.
Optionally, the second determining module 53 may specifically include the following three components:
the polling module is used for polling according to the preset port number sequence after calculating the crosstalk coefficients of all other ports in the link establishment state to the first port, and sequentially calculating the crosstalk coefficient combinations corresponding to all the ports;
the accumulation module is used for accumulating all the calculated crosstalk coefficients in the crosstalk coefficient combinations corresponding to all the ports to obtain all accumulated values corresponding to the crosstalk coefficient combinations;
the sorting module is used for sorting all accumulated values from small to large;
and the third determining module is used for determining the port corresponding to the accumulated value with the top appointed number in all the ordered accumulated values as the external serial port of the vectorization system, and the appointed number is obtained by the product of the total number of all the accumulated values and the preset proportion value.
Optionally, the apparatus 50 provided in this embodiment may further include: the device comprises a setting module, a memory space and a polling starting port number, the maximum port number supported by the vector group, the variables of the port number and the memory space, wherein the polling starting port number, the maximum port number supported by the vector group and the memory space are used for storing crosstalk coefficients before the first port in the current link establishment state in the vector group of the DISLAM is determined.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, and the scope of the invention should not be limited to the embodiments described above.
Claims (8)
1. A method for a vectoring system to identify an external serial port, comprising:
determining a first port currently in a link establishment state in a vector group of a digital subscriber line access multiplexer DISLAM;
calculating crosstalk coefficients of all other ports in a link establishment state to the first port to obtain a crosstalk coefficient combination corresponding to the first port;
determining external ports which are connected in series to the vector group according to all crosstalk coefficients in the crosstalk coefficient combination;
the determining external ports that are connected in series to the vector group according to all crosstalk coefficients in the crosstalk coefficient combination includes:
after calculating the crosstalk coefficients of all other ports in the link establishment state to the first port, sequencing according to preset port numbers to perform polling, and calculating the crosstalk coefficient combinations corresponding to all the ports in sequence;
accumulating all the calculated crosstalk coefficients in the crosstalk coefficient combinations corresponding to all the ports to obtain all accumulated values corresponding to the crosstalk coefficient combinations;
sorting all the accumulated values in a descending order;
and determining the ports corresponding to the top appointed number of the accumulated values in all the ordered accumulated values as external serial ports of the vectorization system, wherein the appointed number is obtained by the product of the total number of all the accumulated values and a preset proportion value.
2. The method of claim 1, further comprising:
before determining the first port currently in the link establishment state in the vector group of the DISLAM, setting variables of a polling starting port number, the maximum port number supported by the vector group, the port number, and a memory space for storing the crosstalk coefficient.
3. The method according to claim 2, wherein the calculating crosstalk coefficients of all other ports in the link establishment state to the first port to obtain a crosstalk coefficient combination corresponding to the first port comprises:
under the condition that the port number of the first port is determined to be smaller than the maximum port number supported by the vector group, acquiring the link establishment state of the first port and the transmission mode of a digital subscriber line (XDSL) from the DISLAM;
and acquiring a crosstalk coefficient combination of the first port from the DISLAM under the condition that the first port is in a link establishment state and the transmission mode of the first port is G.993.5.
4. A method according to any one of claims 1 to 3, characterized in that the crosstalk coefficients in the crosstalk coefficient combinations obtained at one time do not exceed 384 x 2 bytes.
5. An apparatus for a vectoring system to identify external ingress ports, comprising:
a first determining module, configured to determine a first port currently in a link establishment state in a vector group of a digital subscriber line access multiplexer (dilam);
the calculation module is used for calculating crosstalk coefficients of all other ports in a link establishment state to the first port to obtain a crosstalk coefficient combination corresponding to the first port;
a second determining module, configured to determine, according to all crosstalk coefficients in the crosstalk coefficient combination, an external port that is connected in series to the vector group;
the second determining module includes:
the polling unit is used for performing polling according to the preset port number sequence after calculating the crosstalk coefficients of all other ports in the link establishment state to the first port, and sequentially calculating the crosstalk coefficient combinations corresponding to all the ports;
the accumulation unit is used for accumulating all the calculated crosstalk coefficients in the crosstalk coefficient combinations corresponding to all the ports to obtain all accumulated values corresponding to the crosstalk coefficient combinations;
the sorting unit is used for sorting all the accumulated values from small to large;
a third determining unit, configured to determine, as an external serial port of the vectorization system, a port corresponding to a top-most specified number of the ordered all accumulated values, where the specified number is obtained by multiplying a total number of the all accumulated values by a preset ratio value.
6. The apparatus of claim 5, further comprising:
a setting module, configured to set a polling start port number, a maximum port number supported by a vector group, a variable of a port number, and a memory space for storing the crosstalk coefficient before determining a first port currently in a link establishment state in the vector group of the dispam.
7. The apparatus of claim 6, wherein the computing module comprises:
a first obtaining unit, configured to obtain, from the dilam, a link establishment status of the first port and a transmission mode of a digital subscriber line XDSL, if it is determined that the port number of the first port is less than the maximum port number supported by the vector group;
a second obtaining unit, configured to obtain, from the dilam, a crosstalk coefficient combination of the first port when the first port is in a link setup state and a transmission mode of the first port is g.993.5.
8. The apparatus according to any one of claims 5 to 7, wherein the crosstalk coefficients in the crosstalk coefficient combinations obtained at one time are not more than 384 x 2 bytes.
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