JP5358256B2 - Degradation site estimation apparatus, degradation site estimation method, and program thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for estimating the position of a deterioration capable of estimating the deterioration by discriminating a link and a node. <P>SOLUTION: Each element storing topology information and configuring paths, through which packet information passes, on the basis of the packet information transmitted by a terminal in a communication network is decided on the basis of the packet information and the topology information. The deterioration values of the paths, through which the packet information passes, are decided on the basis of the pairs of the packet information acquired in each of the transmission origin side and the transmission destination side. Each element configuring the paths and the deterioration values are associated with each other for every path in the communication network, through which the packet information passes, and stored in a deterioration information table. All elements associated with the deterioration values equal to or smaller than a deterioration decision threshold and recorded on the deterioration information table and the elements in the paths of other packet information matching the elements are decided as non-deterioration elements by using the deterioration decision threshold deciding deterioration or non-deterioration. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a degradation location estimation apparatus, a degradation location estimation method, and a program for estimating a degradation location of a communication network.

  Conventionally, as a method for estimating a deteriorated part of a communication network, there are a “method of grouping in a path unit and estimating a deteriorated part” and a “method of estimating a deteriorated part based on a threshold value in a link unit”. As a “method of grouping in units of paths and estimating a deteriorated portion”, Patent Document 1 discloses a method of grouping paths using a warping path. In addition, as a “method of estimating a deteriorated part based on a threshold value in units of links”, one in which the number of highly correlated paths is estimated as a threshold value for each target section is disclosed in Patent Document 2, and the distribution state of path throughput is also disclosed. Patent Document 3 discloses a technique in which points are given to links based on a threshold and estimated based on a threshold value.

JP 2008-42879 A JP 2006-074447 A JP 2003-018218 A

Here, in the above-described “method of grouping by path unit and estimating a deteriorated portion (Patent Document 1)”, a common section grouped in a deteriorated path is estimated as a deteriorated section, and there are a plurality of deteriorated sections. In this case, the common section of the degraded path may not be a degraded section, and there is a problem in estimation accuracy. Further, the node is not targeted as the estimated location. Therefore, although “fixed / intermittent degradation location estimation” is possible, “multiple degradation location estimation” and “degradation location estimation by distinguishing link nodes” are difficult.
Further, in the above-described “method of estimating a degradation portion based on a threshold value in units of links (Patent Document 2)”, a plurality of degradation sections can be estimated. However, since the section deterioration state is determined based on the number of deteriorated paths, the deterioration state cannot be determined in the case of intermittent deterioration because the number of deteriorated paths is small. Further, the node is not targeted as the estimated location. Therefore, “multiple degradation location estimation” is possible, but “intermittent degradation location estimation” and “degradation location estimation by distinguishing link nodes” are difficult.
Further, in the above-described “method of estimating a degradation location based on a threshold value in units of links (Patent Document 3)”, points are assigned based on the distribution status of the throughput, and the degradation location is estimated based on the threshold value. It may take some time to be done and may not be estimated. Further, the node is not targeted as the estimated location. Therefore, “fixed / intermittent degradation location estimation” and “degradation location estimation by distinguishing link nodes” are difficult.

  Accordingly, an object of the present invention is to provide a degradation location estimation apparatus, a degradation location estimation method, and a program thereof capable of estimating degradation by distinguishing between sections (links) and nodes.

  In order to achieve the above object, the present invention provides a topology information storage means for storing topology information indicating a connection relationship between elements indicating either nodes or links in a communication network, and a terminal transmitted in the communication network. Based on the received packet information, each element constituting the path through which the packet information passes is determined based on the packet information and the topology information. A degradation value judging means for judging a degradation value of a path through which the packet information passes, and a path for each path in the communication network through which the packet information passes. The deterioration information stored in the deterioration information table in association with each element to be performed and the deterioration value Using a table creation means and a deterioration determination threshold value for determining deterioration or non-deterioration, all elements recorded in the deterioration information table corresponding to deterioration values equal to or lower than the deterioration determination threshold value match the element. And a degradation / non-degradation determining means for determining an element in the path of other packet information to be a non-degraded element.

  In the present invention, the degradation point estimation apparatus described above classifies degradation values for each path of the packet information, and identifies a path group having a minimum degradation value among path groups having the same degradation value. A value path specifying means, and a minimum degradation value duplication judgment means for judging an element that overlaps each path in the path group having the minimum degradation value as a degradation element and a non-overlapping element as a non-degradation element. It is characterized by providing.

Further, the present invention is the above-described degradation location estimation apparatus, wherein the minimum degradation value duplication determination means shares an element held among other paths in the path group having the minimum degradation value with other paths, In the tree structure indicated by the topology information, one independent group consisting of a plurality of paths that are connected by the shared path and having an overlapping element in all of the plurality of paths can be identified. Paths having nodes close to the root are sequentially removed from the path group having the minimum degradation value, temporarily stored in the stack, and then overlapped with each path remaining in the path group having the minimum degradation value. In a path that is temporarily stored in the stack. Whether the element includes each element of each path remaining in the path group determined to be the deteriorated element is sequentially determined from the path temporarily stored in the stack, and the element in the path temporarily stored in the stack is determined. When an element completely includes a deteriorated element of one path among elements of each path remaining in the path group and includes only a part of deteriorated elements of other paths, only the part is included. Among the deteriorated elements of other paths that contain the path, only the elements that overlap the path temporarily stored in the stack are determined as non-degraded elements, and the undetermined elements in the path temporarily stored in the stack are not deteriorated. It is determined to be an element.

Further, the present invention is the above-described degradation location estimation apparatus, wherein the minimum degradation value duplication determination means shares an element held among other paths in the path group having the minimum degradation value with other paths, In the tree structure indicated by the topology information, one independent group consisting of a plurality of paths that are connected by the shared path and having an overlapping element in all of the plurality of paths can be identified. Paths having nodes close to the root are sequentially removed from the path group having the minimum degradation value, temporarily stored in the stack, and then overlapped with each path remaining in the path group having the minimum degradation value. In a path that is temporarily stored in the stack. Whether the element includes each element of each path remaining in the path group determined to be the deteriorated element is sequentially determined from the path temporarily stored in the stack, and the element in the path temporarily stored in the stack is determined. If the element does not contain any degraded elements of all paths among the elements of each path remaining in the path group, all undecided elements in the path temporarily stored in the stack are defined as degraded elements. It is characterized by determining.

Further, the present invention is the above-described degradation location estimation apparatus, wherein the minimum degradation value duplication determination means shares an element held among other paths in the path group having the minimum degradation value with other paths, In the tree structure indicated by the topology information, one independent group consisting of a plurality of paths that are connected by the shared path and having an overlapping element in all of the plurality of paths can be identified. Paths having nodes close to the root are sequentially removed from the path group having the minimum degradation value, temporarily stored in the stack, and then overlapped with each path remaining in the path group having the minimum degradation value. In a path that is temporarily stored in the stack. Whether the element includes each element of each path remaining in the path group determined to be the deteriorated element is sequentially determined from the path temporarily stored in the stack, and the element in the path temporarily stored in the stack is determined. In the case where the element includes the degradation elements of all the paths among the elements of the respective paths remaining in the path group, the degradation element of the elements of the respective paths remaining in the path group When there is an element configured only by an element in one path, the degraded element among the elements of each path remaining in the path group is the degraded element configured by elements in a plurality of paths. Re-determined as a non-degrading element and the element constituted by elements in the plurality of paths The non-degraded elements of each path with a reduction element, again determined to deteriorate element, further characterized in that determining all undetermined elements in the path which is temporarily stored in the stack with non-degraded element.

Further, the present invention is the above-described degradation location estimation apparatus, wherein the minimum degradation value duplication determination means shares an element held among other paths in the path group having the minimum degradation value with other paths, In the tree structure indicated by the topology information, one independent group consisting of a plurality of paths that are connected by the shared path and having an overlapping element in all of the plurality of paths can be identified. Paths having nodes close to the root are sequentially removed from the path group having the minimum degradation value, temporarily stored in the stack, and then overlapped with each path remaining in the path group having the minimum degradation value. In a path that is temporarily stored in the stack. Whether the element includes each element of each path remaining in the path group determined to be the deteriorated element is sequentially determined from the path temporarily stored in the stack, and the element in the path temporarily stored in the stack is determined. In the case where the element includes the degradation elements of all the paths among the elements of the respective paths remaining in the path group, the degradation element of the elements of the respective paths remaining in the path group In the case where all the elements are included in a plurality of paths, all the elements of each path remaining in the path group and the elements in the path temporarily stored in the stack are all determined as degraded elements. It is characterized by.

  In the present invention, the degradation point estimation apparatus described above acquires, as target information, a path having an element for which degradation or non-degradation is undecided in the degradation information table, and the degradation value is small. If the path indicated by the target information already has an element that has been determined to be a degraded element in another path, that element is determined to be a degraded element, and if it already has an element that has been determined to be a non-degraded element in another path Determines that the element is a non-degraded element, and as a result, if there is still an undetermined element among the elements in the path indicated by the target information, from the degradation value of the path indicated by the target information, The element in the path indicated by the target information is held as a degraded element The degradation value of the path is subtracted to determine whether the subtraction result is less than 0 or greater than 0. If the subtraction result is greater than 0, it is not determined among the elements in the path indicated by the target information. The remaining element is determined as an undetermined element as it is, and the deterioration value of the other path having the element in the path indicated by the target information as the deterioration element is subtracted from the deterioration value of the path indicated by the target information. Deterioration information table reconstructing means for determining a value as a new deterioration value of a path indicated by the target information.

  In the present invention, the degradation point estimation apparatus described above acquires, as target information, a path having an element for which degradation or non-degradation is undecided in the degradation information table, and the degradation value is small. If the path indicated by the target information already has an element that has been determined to be a degraded element in another path, that element is determined to be a degraded element, and if it already has an element that has been determined to be a non-degraded element in another path Determines that the element is a non-degraded element, and as a result, if there is still an undetermined element among the elements in the path indicated by the target information, from the degradation value of the path indicated by the target information, The element in the path indicated by the target information is held as a degraded element The deterioration value of the path of the target information is subtracted to determine whether the subtraction result is 0 or less or a value greater than 0. If the subtraction result is 0 or less, among the elements in the path indicated by the target information, Deterioration information table reconstructing means for determining all remaining elements as non-degraded elements as a determination.

  In the present invention, the degradation point estimation apparatus described above acquires, as target information, a path having an element for which degradation or non-degradation is undecided in the degradation information table, and the degradation value is small. If the path indicated by the target information already has an element that has been determined to be a degraded element in another path, that element is determined to be a degraded element, and if it already has an element that has been determined to be a non-degraded element in another path Determines that the element is a non-degraded element, and as a result, when there is no undetermined element among the elements in the path indicated by the target information, from the degradation value of the path indicated by the target information, Hold the element in the path indicated by the target information as a degraded element Degradation values of other paths are subtracted to determine whether the subtraction result is 0, a value less than 0, or a value greater than 0. If the subtraction result is 0, the path indicated by the target information Deterioration information table restructuring means for ending the determination of deterioration / non-degradation of the path and determining the deterioration / non-degradation of the path indicated by the next target information.

  In the present invention, the degradation point estimation apparatus described above acquires, as target information, a path having an element for which degradation or non-degradation is undecided in the degradation information table, and the degradation value is small. If the path indicated by the target information has an element already determined as a deteriorated element in the determination target path in the other deterioration information table, the element is determined as a deteriorated element, and the determination in the other deterioration information table is performed. When there is an element that has already been determined as a non-degraded element in the target path, a first degradation / non-degradation determination process is performed to determine that element as a non-degraded element, and as a result, the element in the path indicated by the target information If there are no more undetermined elements, the target The deterioration value of the other path having the element in the path indicated by the target information as the deterioration element is subtracted from the deterioration value of the path indicated by the information, and the subtraction result is 0, a value less than 0, or from 0 If the subtraction result is a value greater than 0, all elements in the interprobe path indicated by the target information and deterioration / non-existence of the elements in the interprobe path indicated by the target information are determined. Other previous determination targets used for determining deterioration / non-degradation of the determination target path by returning the determination with all the elements in the determination target path compared to determine the deterioration to the undetermined element. If there is no path, the elements that have been determined to be degraded elements in the first degradation / non-degradation determination process for the returned inter-probe paths are again non-degraded elements. Determines that cement, also characterized in that it and a deterioration information table reconstruction means determines that deterioration element an element which determines the non-deterioration element in said first degraded and non-deterioration determination process.

  In the present invention, the degradation point estimation apparatus described above acquires, as target information, a path having an element for which degradation or non-degradation is undecided in the degradation information table, and the degradation value is small. If the path indicated by the target information has an element already determined as a deteriorated element in the determination target path in the other deterioration information table, the element is determined as a deteriorated element, and the determination in the other deterioration information table is performed. If there is an element that has already been determined to be a non-deteriorating element in the target path, a second deterioration / non-deteriorating determination process is performed to determine that element as a non-deteriorating element, and as a result, the element in the path indicated by the target information If there are no more undetermined elements, the target The deterioration value of the other path having the element in the path indicated by the target information as the deterioration element is subtracted from the deterioration value of the path indicated by the information, and the subtraction result is 0, a value less than 0, or from 0 If the subtraction result is a value greater than 0, all elements in the interprobe path indicated by the target information and deterioration / non-existence of the elements in the interprobe path indicated by the target information are determined. Other previous determination targets used for determining deterioration / non-degradation of the determination target path by returning the determination with all the elements in the determination target path compared to determine the deterioration to the undetermined element. If there is a path, it overlaps with an undetermined element in the determination target path among elements in the previous determination target path that are not included in the element in the determination target path. Degradation information table reconstructing means that determines an element as a non-degraded element, and determines that an undetermined element of the element in the determination target path and a duplicate element of the target information are degrading elements and a non-duplicate element as a non-degrading element And.

  In the present invention, the degradation point estimation apparatus described above acquires, as target information, a path having an element for which degradation or non-degradation is undecided in the degradation information table, and the degradation value is small. If the path indicated by the target information already has an element that has been determined to be a degraded element in another path, that element is determined to be a degraded element, and if it already has an element that has been determined to be a non-degraded element in another path Determines that the element is a non-degraded element, and as a result, when there is no undetermined element among the elements in the path indicated by the target information, from the degradation value of the path indicated by the target information, Hold the element in the path indicated by the target information as a degraded element Degradation values of other paths are subtracted to determine whether the subtraction result is 0, a value less than 0, or a value greater than 0. If the subtraction result is less than 0, subtraction in the target information The later deterioration value is added to the deterioration value of the other path having any of the elements in the path indicated by the target information as the deterioration element, and any of the elements in the path indicated by the target information is set as the deterioration element. A deterioration information table reconstructing unit that determines a deterioration value of another path to be held and assigns an absolute value of the deterioration value after subtraction of the target information to an element determined to be non-deteriorating in the target information. It is characterized by that.

  In the present invention, the degradation point estimation apparatus described above records the identification information of each element in association with the determination value for the element determined to be the deterioration element, and records the minimum deterioration value duplication determination unit and the deterioration information. A total determination value calculation unit that calculates a total determination value of each element by adding a weighted value to the determination value for the element determined to be the deteriorated element each time each process of the table restructuring unit is repeated. It is characterized by that.

  Further, according to the present invention, the topology information storage means of the degradation location estimation apparatus stores topology information indicating the connection relationship of each element indicating either a node or a link in the communication network, and the in-path element determination of the degradation location estimation apparatus is performed. Means determines, based on the packet information sent from the terminal in the communication network, each element constituting a path through which the packet information passes based on the packet information and the topology information, and estimates the degradation location Deterioration value determination means of the device determines a deterioration value of a path through which the packet information passes based on the pair of packet information acquired on each of the transmission source side and the transmission destination side, and The degradation information table creation means, for each path in the communication network through which the packet information has passed, The deterioration values are stored in the deterioration information table in association with the deterioration values, and the deterioration determination threshold value used by the deterioration / non-deterioration determination means of the deterioration point estimation device to determine deterioration or non-deterioration is used. Thus, all elements recorded in the deterioration information table in association with the deterioration value equal to or lower than the deterioration determination threshold and elements in the path of other packet information that matches the element are determined as non-deteriorating elements. It is the degradation location estimation method characterized by doing.

  According to the present invention, in the above-described degradation location estimation method, the minimum degradation value path specifying unit of the degradation location estimation apparatus classifies degradation values for each path of the packet information, and each of the path groups having the same degradation value. The path group having the minimum degradation value is identified, and the minimum degradation value duplication determination unit of the degradation location estimation apparatus determines that the element overlapping each path in the path group having the minimum degradation value is a degradation element The element that does not overlap is determined as a non-degraded element.

Further, the present invention is the above-described degradation location estimation method, wherein the minimum degradation value duplication determination means of the degradation location estimation device is configured to store other elements among the paths in the path group having the minimum degradation value. In the topology information until one independent group consisting of a plurality of paths that are shared with a path and connected by the shared paths and that includes an overlapping element in all of the plurality of paths can be identified. In the tree structure shown, the path having the node closest to the root is sequentially removed from the path group having the minimum degradation value and temporarily stored in the stack, and then each remaining in the path group having the minimum degradation value is stored. Elements that overlap in each path are determined as degraded elements, elements that do not overlap are determined as non-degraded elements, and Whether the elements in the path temporarily stored in the path group include the elements of each path remaining in the path group determined to be the deteriorated element is determined in order from the path temporarily stored in the stack lastly. The elements in the path temporarily stored in the path group completely include the deteriorated element of one path among the elements of the respective paths remaining in the path group, and only partially include the deteriorated elements of the other paths. In this case, among the deteriorated elements of the other paths that include only the part, only the elements that overlap the path temporarily stored in the stack are re-determined as non-degraded elements, and the path temporarily stored in the stack The undetermined element is determined as a non-degraded element.

Further, the present invention is the above-described degradation location estimation method, wherein the minimum degradation value duplication determination means of the degradation location estimation device is configured to store other elements among the paths in the path group having the minimum degradation value. In the topology information until one independent group consisting of a plurality of paths that are shared with a path and connected by the shared paths and that includes an overlapping element in all of the plurality of paths can be identified. In the tree structure shown, the path having the node closest to the root is sequentially removed from the path group having the minimum degradation value and temporarily stored in the stack, and then each remaining in the path group having the minimum degradation value is stored. Elements that overlap in each path are determined as degraded elements, elements that do not overlap are determined as non-degraded elements, and Whether the elements in the path temporarily stored in the path group include the elements of each path remaining in the path group determined to be the deteriorated element is determined in order from the path temporarily stored in the stack lastly. If the elements in the path temporarily stored in the path group do not include all the degraded elements of all the paths in the respective paths remaining in the path group, all the paths in the path temporarily stored in the stack An undecided element is judged as a deteriorated element.

Further, the present invention is the above-described degradation location estimation method, wherein the minimum degradation value duplication determination means of the degradation location estimation device is configured to store other elements among the paths in the path group having the minimum degradation value. In the topology information until one independent group consisting of a plurality of paths that are shared with a path and connected by the shared paths and that includes an overlapping element in all of the plurality of paths can be identified. In the tree structure shown, the path having the node closest to the root is sequentially removed from the path group having the minimum degradation value and temporarily stored in the stack, and then each remaining in the path group having the minimum degradation value is stored. Elements that overlap in each path are determined as degraded elements, elements that do not overlap are determined as non-degraded elements, and Whether the elements in the path temporarily stored in the path group include the elements of each path remaining in the path group determined to be the deteriorated element is determined in order from the path temporarily stored in the stack lastly. The elements in the path temporarily stored in the path group include the degradation elements of all the paths among the elements of the respective paths remaining in the path group, and each of the paths remaining in the path group In the case where there is an element composed of only elements in one path, the deteriorated element of each of the remaining paths in the path group is determined by elements in a plurality of paths. Re-determine the configured degraded element as a non-degraded element, and elements in the multiple paths Thus the non-degraded elements of each path with the deterioration elements constituted, re-determined deterioration element,
Furthermore, all the undecided elements in the path temporarily stored in the stack are judged as non-degraded elements.

Further, the present invention is the above-described degradation location estimation method, wherein the minimum degradation value duplication determination means of the degradation location estimation device is configured to store other elements among the paths in the path group having the minimum degradation value. In the topology information until one independent group consisting of a plurality of paths that are shared with a path and connected by the shared paths and that includes an overlapping element in all of the plurality of paths can be identified. In the tree structure shown, the path having the node closest to the root is sequentially removed from the path group having the minimum degradation value and temporarily stored in the stack, and then each remaining in the path group having the minimum degradation value is stored. Elements that overlap in each path are determined as degraded elements, elements that do not overlap are determined as non-degraded elements, and Whether the elements in the path temporarily stored in the path group include the elements of each path remaining in the path group determined to be the deteriorated element is determined in order from the path temporarily stored in the stack lastly. The elements in the path temporarily stored in the path group include the degradation elements of all the paths among the elements of the respective paths remaining in the path group, and each of the paths remaining in the path group When all of the deteriorated elements of the elements are configured by elements in a plurality of paths, all the elements of each path remaining in the path group and the elements in the path temporarily stored in the stack are all It is determined that the element is a deteriorated element.

  Further, the present invention is the above-described degradation location estimation method, wherein the degradation information table reconstruction means of the degradation location estimation device is a path having elements in which degradation or non-degradation determination is undetermined in the degradation information table, A path having a small degradation value is acquired as target information. If the path indicated by the target information has an element already determined as a degradation element in another path, the element is determined as a degradation element. When there is an element determined to be a non-degraded element in the path, the element is determined to be a non-degraded element, and as a result, there is still an undetermined element among the elements in the path indicated by the target information. Is determined from the degradation value of the path indicated by the target information. Subtract the degradation value of another path that holds the element in the path indicated by the report as a degradation element to determine whether the subtraction result is 0 or less or greater than 0. If the subtraction result is greater than 0, The element remaining as undetermined among the elements in the path indicated by the target information is determined as an undetermined element as it is, and the element in the path indicated by the target information is determined from the degradation value of the path indicated by the target information. A value obtained by subtracting the deterioration value of another path held as a deterioration element is determined as a new deterioration value of the path indicated by the target information.

  Further, the present invention is the above-described degradation location estimation method, wherein the degradation information table reconstruction means of the degradation location estimation device is a path having elements in which degradation or non-degradation determination is undetermined in the degradation information table, A path having a small degradation value is acquired as target information. If the path indicated by the target information has an element already determined as a degradation element in another path, the element is determined as a degradation element. When there is an element determined to be a non-degraded element in the path, the element is determined to be a non-degraded element, and as a result, there is still an undetermined element among the elements in the path indicated by the target information. Is determined from the degradation value of the path indicated by the target information. When the deterioration value of the other path having the element in the path indicated by the information as a deterioration element is subtracted to determine whether the subtraction result is 0 or less or a value greater than 0, and the subtraction result is 0 or less Is characterized in that all elements remaining as undetermined among the elements in the path indicated by the target information are determined as non-degraded elements.

  Further, the present invention is the above-described degradation location estimation method, wherein the degradation information table reconstruction means of the degradation location estimation device is a path having elements in which degradation or non-degradation determination is undetermined in the degradation information table, A path having a small degradation value is acquired as target information. If the path indicated by the target information has an element already determined as a degradation element in another path, the element is determined as a degradation element. When there is an element determined to be a non-degraded element in the path, the element is determined to be a non-degraded element, and as a result, there is no undetermined element among the elements in the path indicated by the target information. Is determined from the degradation value of the path indicated by the target information. The degradation value of the other path having the element in the path indicated by the information as the degradation element is subtracted to determine whether the subtraction result is 0, a value less than 0, or a value greater than 0, and the subtraction result is In the case of 0, the determination of the deterioration / non-degradation of the path indicated by the target information is terminated, and the determination of the deterioration / non-degradation of the path indicated by the next target information is performed.

  Further, the present invention is the above-described degradation location estimation method, wherein the degradation information table reconstruction means of the degradation location estimation device is a path having elements in which degradation or non-degradation determination is undetermined in the degradation information table, A path with a small deterioration value is acquired as target information, and if the path indicated by the target information already has an element that has already been determined to be a deterioration element in another determination target path in the deterioration information table, the element is deteriorated. If there is an element that has been determined as an element and has already been determined to be a non-degraded element in the determination target path in the other deterioration information table, a first deterioration / non-degradation determination process is performed to determine that element as a non-deteriorating element. As a result, the elements in the path indicated by the target information When a certain element no longer exists, the degradation value of the other path having the element in the path indicated by the target information as a degradation element is subtracted from the degradation value of the path indicated by the target information, It is determined whether the subtraction result is 0, a value less than 0, or a value greater than 0. If the subtraction result is a value greater than 0, all the elements in the inter-probe path indicated by the target information, The determination with all the elements in the determination target path compared lastly to determine the deterioration / non-degradation of the element in the inter-probe path indicated by the target information is returned to the undetermined element, and the determination target path If there is no other pre-determination target path used for determination of degradation / non-degradation, the first degradation / non-degradation determination is again performed for the returned inter-probe paths. The elements determined to deteriorate elements in management determines that non-degrading elements, also characterized by determining the element where it is determined that non-degrading elements in said first degraded and non-deterioration determination process of the degradation element.

  Further, the present invention is the above-described degradation location estimation method, wherein the degradation information table reconstruction means of the degradation location estimation device is a path having elements in which degradation or non-degradation determination is undetermined in the degradation information table, A path with a small deterioration value is acquired as target information, and if the path indicated by the target information already has an element that has already been determined to be a deterioration element in another determination target path in the deterioration information table, the element is deteriorated. A second deterioration / non-degradation determination process for determining an element as a non-degraded element when the element is determined to be an element and has already been determined to be a non-degraded element in another determination target path in the deterioration information table As a result, the elements in the path indicated by the target information When a certain element no longer exists, the degradation value of the other path having the element in the path indicated by the target information as a degradation element is subtracted from the degradation value of the path indicated by the target information, It is determined whether the subtraction result is 0, a value less than 0, or a value greater than 0. If the subtraction result is a value greater than 0, all the elements in the inter-probe path indicated by the target information, The determination with all the elements in the determination target path compared lastly to determine the deterioration / non-degradation of the element in the inter-probe path indicated by the target information is returned to the undetermined element, and the determination target path If there is another pre-determination target path used for the determination of deterioration / non-deterioration, an element in the pre-determination target path that is not included in the element in the determination target path is used. An element that overlaps with an undetermined element in the determination target path is determined as a non-degraded element, and an undetermined element of the element in the determination target path and an overlapping element in the target information are degraded elements, It is characterized in that elements that do not overlap are determined as non-deteriorating elements.

  Further, the present invention is the above-described degradation location estimation method, wherein the degradation information table reconstruction means of the degradation location estimation device is a path having elements in which degradation or non-degradation determination is undetermined in the degradation information table, A path having a small degradation value is acquired as target information. If the path indicated by the target information has an element already determined as a degradation element in another path, the element is determined as a degradation element. When there is an element determined to be a non-degraded element in the path, the element is determined to be a non-degraded element, and as a result, there is no undetermined element among the elements in the path indicated by the target information. Is determined from the degradation value of the path indicated by the target information. The degradation value of the other path having the element in the path indicated by the information as the degradation element is subtracted to determine whether the subtraction result is 0, a value less than 0, or a value greater than 0, and the subtraction result is If it is less than 0, the degradation value after subtraction in the target information is added to the degradation value of another path having any of the elements in the path indicated by the target information as a degradation element, and the target information The degradation value of the other path having any one of the elements in the path indicated by is determined as a degradation element, and the absolute value of the degradation value after subtraction of the target information is determined as an element that is determined to be non-degradation in the target information. It is characterized by assigning a value.

  According to the present invention, in the above-described degradation location estimation method, the total judgment value calculation means of the degradation location estimation apparatus records the identification information of each element in association with the judgment value for the element determined to be the degradation element. Each time the processes of the minimum deterioration value duplication determination means and the deterioration information table reconstruction means are repeated, a weighted value is added to the determination value for the element determined to be the deterioration element, and the total determination of each element is performed. A value is calculated.

  Moreover, this invention is a program characterized by making a computer function as any one of the above-mentioned degradation location estimation apparatuses.

According to the present invention, by changing the dynamic weighting, it can be estimated as an occurrence location of intermittent degradation (failure with a low occurrence frequency of communication delay and packet loss).
In addition, according to the above-described processing, since deterioration / non-degradation is determined using the link and the node as different elements, it is possible to perform the processing for estimating a deteriorated part in which the link and the node are distinguished.

It is a 1st block diagram which shows the structure of the degradation location estimation system which has a degradation location estimation apparatus. It is a 2nd block diagram which shows the structure of the degradation location estimation system which has a degradation location estimation apparatus. It is a functional block diagram of a degradation location estimation apparatus. It is a figure which shows the data structure of a deterioration information table. It is a figure which shows the example of a division | segmentation of an independent group. It is a figure which shows the data structure of a 1 cycle classification result table. It is a figure which shows the data structure of a total estimation result table. It is a figure which shows the data structure of network topology information. It is a 1st figure which shows the processing flow of a degradation location estimation apparatus. It is a 2nd figure which shows the processing flow of the element information classification | category of a degradation location estimation apparatus. It is a figure which shows the outline | summary of the division | segmentation process to an independent group. It is a figure which shows the outline | summary of the deterioration / non-deterioration determination processing when only one overlapping element group can be extracted. It is a figure which shows the processing flow at the time of determining that only one overlapping element group can be extracted in all the paths between probes in an independent group. It is a figure which shows the processing flow of 1st duplication state determination. It is a figure which shows the transition of the deterioration information table at the time of 1st duplication state determination. It is a figure which shows the processing flow of 2nd duplication state determination. It is a figure which shows the transition of the deterioration information table at the time of a 2nd duplication state determination. It is a figure which shows the processing flow of 3rd duplication state determination. It is a figure of FIG. 1 which shows the transition of the process outline | summary at the time of a 3rd duplication state determination. It is a 1st figure which shows the transition of the deterioration information table at the time of a 3rd duplication state determination. It is FIG. 2 which shows the transition of the process outline | summary at the time of a 3rd duplication state determination. It is a 2nd figure which shows the transition of the deterioration information table at the time of a 3rd duplication state determination. It is a 1st figure which shows the processing flow of a degradation information table reconstruction process. It is a 2nd figure which shows the processing flow of a degradation information table reconstruction process. It is a 1st figure which shows the transition of the process outline | summary of a degradation information table reconstruction process. It is a 1st figure which shows the transition of the deterioration information table of a deterioration information table reconstruction process. It is a 3rd figure which shows the processing flow of a degradation information table reconstruction process. It is a 2nd figure which shows the transition of the process outline | summary of a degradation information table reconstruction process. It is a 2nd figure which shows the transition of the deterioration information table of a deterioration information table reconstruction process. It is a 4th figure which shows the processing flow of a degradation information table reconstruction process. It is a 3rd figure which shows the transition of the deterioration information table of a deterioration information table reconstruction process. It is a 4th figure which shows the transition of the deterioration information table of a deterioration information table reconstruction process. It is a 3rd figure which shows the transition of the process outline | summary of a degradation information table reconstruction process. It is a 5th figure which shows the transition of the deterioration information table of a deterioration information table reconstruction process. It is a 6th figure which shows the transition of the deterioration information table of a deterioration information table reconstruction process. It is a 4th figure which shows the transition of the process outline | summary of a degradation information table reconstruction process. It is a figure which shows the processing flow of 4th duplication state determination. It is a figure which shows the transition of the process outline | summary at the time of a 4th duplication state determination. It is a figure which shows the transition of the deterioration information table at the time of a 4th duplication state determination. It is a figure which shows the processing flow of 4th duplication state determination. It is a figure which shows the transition of the process outline | summary at the time of a 4th duplication state determination. It is a figure which shows the transition of the deterioration information table at the time of a 4th duplication state determination.

Hereinafter, a degradation point estimation apparatus according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a first block diagram showing a configuration of a deterioration location estimation system having a deterioration location estimation device according to the embodiment.
In this figure, reference numeral 1 is a degradation location estimation device for estimating a degradation location of a communication network, 10 is a network topology information storage section that stores topology (configuration) information of the communication network, and 2 is a degradation location of information of a detected communication packet. A probe to be transmitted to the estimation device 1, 3 is a router for selecting a communication path of a packet flowing in the communication network, and 4 is a terminal for communication. Note that the probe 2 may exist on a one-to-one basis with each terminal 4 or may be connected on a one-to-N basis in the degradation point estimation system. The probe 2 captures a communication packet from the terminal 4 into the network, a packet flowing from the network toward the terminal 4, and the like. Moreover, the probe 2 should just be installed in the position which can capture the communication packet between an estimation object network and a terminal.

FIG. 2 is a second block diagram showing a configuration of a deterioration location estimation system having a deterioration location estimation apparatus according to the embodiment.
The degradation point estimation system shown in this figure shows an example in which the arrival / departure terminal 5 has the function of the probe 2 shown in FIG. Other configurations are the same as those in FIG. That is, in the degradation point estimation system, the probe may capture information of packets flowing in the communication network with respect to the degradation point estimation device 1 as shown in FIG. Information on packets flowing in the communication network may be transmitted. In the following description, it is assumed that the degradation point estimation system has the configuration shown in FIG.

FIG. 3 is a functional block diagram of the degradation point estimation apparatus.
As shown in this figure, the degradation location estimation apparatus 1 includes a probe information reception unit 11, a degradation element extraction unit 12, a degradation element classification unit 13, a degradation element estimation unit 14, a degradation information table storage unit 15, and a one-cycle classification result table. A storage unit 16 and a total estimation result table storage unit 17 are provided.
The probe information receiving unit 11 performs a process of creating a deterioration information table from the information sent from the probe 2 and the network topology information.
The degraded element extraction unit 12 performs a process of extracting a degraded element from the degraded path using the non-degraded path and updating the degradation information table.
Further, the degradation element classification unit 13 classifies and determines the similarity of degradation information using the degradation value, classifies the degradation information into a degradation element / non-degradation element, and updates the degradation information table based on the duplication determination for each classification. . Further, based on the classified result, a process for setting information in the classification result table for one cycle (per unit process) is performed.
In addition, the degradation element estimation unit 14 adds a value obtained by performing dynamic weighting to the result set in the one-cycle classification result table to the total estimation result table, and adds an element whose total value is equal to or greater than a certain threshold to the degradation location. The process which estimates is performed.
Details of the processing of each processing unit will be described later.

Here, the element is a general term for the link between the probe 2, the router 3, and the router 3 and the link between the probe 2 and the router 3 constituting the communication network.
In addition, a degraded path is a path in which a communication path between terminals has a failure such as a communication delay or a packet loss in any of a node (router 3) and a link through which a communication packet passes. Show.
The non-degraded path is a communication path in which a communication path between terminals is free from any communication delay or packet loss failure at any of the nodes and links through which the communication packet passes. Yes.
In the present embodiment, the degradation value indicates a communication delay time between probes (a time calculated by each packet of the same communication captured by the probe 2). If the degradation value is greater than or equal to a certain threshold value, the communication path used in communication between the terminals is determined to be a degradation path. The deterioration value may be a packet loss rate.

FIG. 4 is a diagram showing a data structure of the deterioration information table.
FIG. 5 is a diagram illustrating an example of division of independent groups.
As shown in FIG. 4, the deterioration information table includes an independent group, probe identification information, deterioration value, undecided element, deteriorated element, non-degraded element, determined element, and whether or not duplication determination processing 1 has been performed (in the figure, This is a data table consisting of items of “determination 1), whether or not duplication determination processing 2 has been performed (determination 2 in the drawing), and information on other paths used as determination targets (determination target in the drawing). Here, the independent group is a group composed of a plurality of paths in which elements held in the inter-probe path are shared with other paths and the relationships are connected by the shared paths.

That is, as shown in FIG. 5, in the communication network having the probes A to M, the paths between the probes A to C and BC have a shared link. Two inter-probe paths belong to one independent group. Further, the paths between probes DE, DF, DI, GI, and HI as shown in FIG. 5B are shared by DE, DF, and DI. And a link shared by GI and HI, and the inter-probe paths of DE and DF and the inter-probe paths of GI and GH are shared. Since the relationship is connected by the inter-probe path of D-I having a link (element) to be connected, each inter-probe path of these DE, DF, DI, GI, and HI is 1 Belongs to two independent groups.
The probe identification information indicates two probes in the interprobe path.
Further, the degradation value indicates a communication delay time between the two probes as described above.
An undetermined element indicates an element that has not been determined to be degraded or non-degraded in the inter-probe path.
Further, the deterioration element indicates an element that is once determined to be deteriorated in the inter-probe path.
Further, the non-degraded element indicates an element that is once determined to be non-degraded in the inter-probe path.
The determined element indicates an element for which determination of deterioration or non-deterioration is confirmed in the interprobe path.
In FIG. 4, the item of overlap determination process 1 (determination 1 in the figure) corresponds to a process called overlap determination process 1 among the overlap determinations for determining whether or not elements are overlapped between a plurality of probe paths. It is an item for memorizing what to do.
In FIG. 4, the item of overlap determination process 2 (determination 2 in the figure) corresponds to a process called overlap determination process 2 among the overlap determinations for determining whether or not elements are overlapped between a plurality of probe paths. It is an item for memorizing what to do .
4 was or items to be determined, in duplicate determination process, when there are other paths used for the determination is an item for registering the information.

FIG. 6 is a diagram showing a data structure of the one-cycle classification result table.
As shown in this figure, the 1-cycle classification result table associates the determination result value of deterioration or non-deterioration of each element in one cycle (per unit process) in association with the element ID that specifies each element in the communication network. I remember it.

FIG. 7 is a diagram illustrating a data configuration of the total estimation result table.
As shown in this figure, the total estimation result table stores a total determination result value in association with an element ID that identifies each element in the communication network.

FIG. 8 is a diagram showing a data configuration of network topology information.
The network topology information storage unit 10 stores connection relationships of elements (links between the probe 2, the router 3 and the router 3, and the link between the probe 2 and the router 3) in the communication network. For example, in the case of the probe 2, the ID of the probe 2 and the ID of the link connected to the probe 2 are stored in association with each other. In the case of the router 3, the ID of the router 3 and the ID of the link connected to the router 3 are stored in association with each other. In the case of a link, the ID of the link and the node IDs of the probe 2 and the router 3 connected to the link are stored. Further, the network topology information storage unit 10 stores the node order in the tree structure of each node. For example, in the case of a root node, the node rank 1 is assigned, and if it is a child node of the root node, a number in the 100s is assigned, and if it is a child node of the 100s, a number in the 200s is assigned. The ranks in the hierarchy are recorded in association with each other. For example, if the node is assigned number 101, the root node is the first layer, the first node in the second layer, and the node assigned number 102 is the second node in the second layer.

FIG. 9 is a first diagram illustrating a processing flow of the degradation point estimation apparatus.
Next, the process flow of the degradation location estimation apparatus according to the present embodiment will be described.
First, the probe information receiving unit 11 of the degradation point estimation apparatus 1 receives information transmitted from the probe 2 from each probe 2 (step S101). The information transmitted by the probe 2 is packet information captured by the probe 2, capture time information, and probe ID. Further, the packet information may be the packet itself or only specific information extracted from the captured packet. Specifically, it is information in which packet identification information such as a transmission source IP address, a transmission destination IP address, and a sequence number included in the packet is stored.

  Then, the probe information receiving unit 11 calculates the degradation value (packet delay time) of the path between two probes within the processing time of one cycle (unit processing) based on the information received from the probe 2 (step S102). . When the two probes are the probe A and the probe B, the packet information received from the probe A and the information received from the probe B among the information received from the probe A, the transmission source IP address, the transmission destination IP address, This is because a pair of packet information having the same sequence number is acquired, and a difference in capture time between the probe A and the probe B of each reception information. Then, the IDs of the two probes constituting the two inter-probe paths (paths constituted by the elements through which the packets acquired by the probe A and the probe B have passed), the degradation value calculated for the inter-probe paths, A deterioration information table in which a plurality of element information included in the inter-probe path is associated with the area of the undetermined element is created (step S103). The identification of each element through which the packets acquired by the probe A and the probe B have passed is made by matching information sent from two probes (probe A and probe B), for example, (terminal →) probe A → inside network → probe B As in (→ terminal), two probes are specified, a path between the two probes is specified from the held network topology information, and a packet passing element is specified.

  For example, the path between the probes can be identified based on the information sent from the two probes (probe A and probe B) based on the network topology information from the connection link ID of each probe A and B and the parent node. Extract. If the parent nodes match, the process ends. If not, a higher-order parent node is extracted. Then, this process is repeated, and the process ends when the parent nodes match. All IDs of the extracted nodes and links are specified as element IDs, and are registered in the deterioration information table as elements in the interprobe paths of two probes.

  Next, the degradation element extraction unit 12 is a probe registered in association with a degradation value less than a predetermined threshold value for determining non-degradation among the registered degradation values in the created degradation information table. It is determined whether there is an inter-path (step S104), and all the elements of the element ID in the inter-probe path registered in association with the deterioration value less than the predetermined threshold are determined as non-deteriorating elements (step S104). S105), the ID of the element determined to be the non-degraded element is deleted from the area of the undetermined element and written to the area of the non-degraded element. Further, an element with an element ID already written to the non-degraded element is judged as a non-degraded element from among the undetermined elements for other inter-probe paths having the element ID written to the non-degraded element (step S106) The element ID is deleted from the area of the undetermined element and written to the area of the determined element. Then, the deteriorated element classifying unit 13 associates the result value of “−1” with all the element IDs in the inter-probe path registered in association with the deteriorated value less than the predetermined threshold, and performs one cycle. Register in the classification result table (step S107). If all the inter-probe paths are associated with degradation values less than a predetermined threshold, the elements in all the inter-probe paths are non-degraded, and one cycle of processing ends. As a result, elements other than those in the inter-probe path associated with the degradation value greater than or equal to the predetermined threshold except those that match the elements in the inter-probe path associated with the degradation value less than the predetermined threshold. However, it remains in the deterioration information table as an undetermined element for which deterioration or non-deterioration is not determined.

FIG. 10 is a second diagram illustrating a process flow of element information classification of the degradation point estimation apparatus.
Next, the degradation element classification unit 13 classifies each inter-probe path having each element remaining as an undetermined element based on the degradation value in the degradation information table. In this classification procedure, first, an interprobe path having a minimum degradation value is extracted (step S201). For example, if the minimum degradation value is 10, and there is one or more inter-probe paths registered in the degradation information table in association with the degradation value, the inter-probe paths are extracted. The interprobe path registered in the deterioration information table in association with the minimum deterioration value is regarded as an interprobe path having only one deterioration element. In the present embodiment, it is assumed that the degradation value of the interprobe path that is the smallest degradation value is 10.

  Then, the degradation element classification unit 13 (minimum degradation value duplication determination unit) divides each inter-probe path corresponding to the minimum degradation value for each independent group (step S202). At this time, the deteriorated element classifying unit 13 compares the elements held by each path in the inter-probe path group having the minimum deteriorated value, and sets the inter-probe paths having an overlapping relationship as one group, and has no overlapping relationship. Classify the interprobe path as a separate group.

  Specifically, as shown in FIG. 5, the degraded element classification unit 13 compares the element information in the inter-probe path between different inter-probe paths, and if there is a shared link, the different inter-probe paths. It is determined that a plurality belong to the same independent group. In addition, even if there is no link shared between the inter-probe paths, if they are shared in different links in the other inter-probe paths, the three inter-probe paths are determined to belong to the independent group. To do.

FIG. 11 is a diagram showing an outline of the division process into independent groups.
FIG. 12 is a diagram showing an overview of the degradation / non-degradation determination process when overlapping elements can be extracted for all paths in the independent group.
In FIG. 11, the paths between probes A-C and B-C have a shared link. Therefore, these two paths between probes A-C and B-C belong to one independent group (a). It is shown that.
Further, in FIG. 11, each of the five interprobe paths DE, DF, GI, HI, and DI has links shared by DE and DF, It has a link shared by GI and HI. Furthermore, D-I has links shared at different points between D-E or D-F and GI or H-I. Therefore, these five inter-probe paths D-E, D-F, G-I, H-I, and D-I share the elements they hold with other paths, and are related by the shared paths. Since they are connected, it indicates that they belong to one independent group (b).
In FIG. 11, each of the three interprobe paths JM, JL, and KL has a shared link. Therefore, the three probes JM, JL, and KL are between the three probes. The path indicates that it belongs to one independent group (c).
In addition, the case where the degradation value of all the paths between probes is the minimum 10 is shown.

  Next, the deteriorated element classifying unit 13 determines whether or not duplicate elements can be extracted in all the inter-probe paths in the independent group (step S203). In the independent group (a) in FIG. 11, one overlapping element group can be extracted in all the inter-probe paths in the independent group in the AC inter-probe path and the BC inter-probe path. That is, one element group of elements 3, 11, and 6 can be extracted in the A-C interprobe path and the B-C interprobe path in the independent group (a). Then, the degraded element classifying unit 13 is able to extract one overlapping element group in all inter-probe paths in the independent group. In the independent group ((a) and (c)), the overlapping element is degraded. judge. That is, in the independent group (a), since the minimum deterioration value is the same, it can be considered that only one of the owned elements has a deterioration element. Therefore, there is a high possibility that deterioration (delay, packet loss, etc.) does not occur in different elements in the paths between the probes A-C and BC. Therefore, it can be considered that degradation has occurred somewhere in the overlapping elements in all the inter-probe paths in the independent group.

  Then, as shown in FIG. 12, the deteriorated element classifying unit 13 determines the undetermined elements 1, 2, 3, 4, 6, 7, 8, 9, 11 in the AC probe paths of the independent group (a). In each of the undetermined elements 3, 5, 6, 10, and 11 in the B-C inter-probe path, the overlapping element groups 3, 6, and 11 are transferred from the undetermined element region of the deterioration information table to the deteriorated element. Rewriting to the area, and other elements are rewritten from the area of the undetermined element to the area of the non-degraded element. That is, according to this processing, the deteriorated element classifying unit 13 determines that an element that overlaps each of all the paths remaining in the path group having the minimum deterioration value is a deteriorated element, and sets an element that does not overlap as an undegraded element. Determination is made (step S204).

  Further, the deteriorated element classification unit 13 determines whether the information of the temporarily stored path element exists in the stack (step S206), and if not, ends the minimum deteriorated value duplication determination process for one cycle. If there is an element of the path temporarily stored in the stack, the information of the element of one path temporarily stored in the stack is read (step S207), and the first overlap state determination to the fourth overlap state are read. Which one of the determinations is to be performed is determined (step S208).

In the process of step S203 described above, the deteriorated element classifying unit 13 performs the following process when determining that it is not possible to determine whether or not an overlapping element group can be extracted in all the inter-probe paths in the independent group. .
The independent group in this case corresponds to the independent group (b) shown in FIG. That is, in the inter-probe path in the independent group (b), no element group that overlaps in all the inter-probe paths in the independent group can be extracted. That is, the DE and DF paths and the GI and HI paths do not have overlapping elements. In such a case, first, the inter-probe path having the highest hierarchical node is removed from the independent group from the network topology information and stored in the stack (PUSH) (step S205), and the process of step S203 is repeated. The process is repeated until only one group can be extracted, and the above-described deterioration / non-deterioration element determination is performed in each of the obtained independent groups.

FIG. 13 is a diagram illustrating a processing flow when it is determined that no overlapping element group can be extracted in all the inter-probe paths in the independent group.
Here, the processing in step S205 is repeated, and as a result, details will be described in a case where it is determined in step S203 described above that overlapping element groups can be extracted in all the inter-probe paths in the independent group.
When the deteriorated element classifying unit 13 is in a state in which overlapping element groups can be extracted, each of the obtained independent groups determines whether there are overlapping elements in all paths. As shown in FIG. 13, when the inter-probe path of DI is pushed onto the stack in the independent group (b), the independent group (d) having two inter-probe paths of DE and DF, and G- Dividing into independent groups (e) having two inter-probe paths I and HI, each independent group is in a state where overlapping element groups can be extracted. In such a state, the deteriorated element classification unit 13 includes the elements 15, 17, and 29 that overlap in the two probe paths D-E and DF of the independent group (d) and the G of the independent group (e). The elements 14, 22, 27, and 28 that overlap in the two inter-probe paths of -I and HI are determined as degraded elements, and the elements that do not overlap in the two inter-probe paths in each independent group are determined as non-degraded elements. In the deterioration information table, the undetermined element is temporarily rewritten from the deteriorated element.

Then, the deteriorated element classification unit 13 determines whether there is data in the stack in step S206 described above. Now, since the element information of the inter-probe path of DI processed when the independent group (b) is divided into the independent groups (d) and (e) is stored in the stack, in step S207 described above, One piece of information on the interprobe path is read. The deteriorated element classifying unit 13 determines first to fourth overlap states between each element of the interprobe path read from the stack and each element that has already been determined to be a deteriorated element. Here, in this overlap state determination,
(First overlap state determination)
In the information that has already been determined to be a degraded element, there is one degraded element that is completely contained in the element in the inter-probe path read from the stack, and the other degraded element is an element in the inter-probe path that is read from the stack. And only partially overlap
(Second overlap state determination)
If none of the degraded elements are completely contained in the elements in the interprobe path read from the stack,
(Third overlap state determination)
When all the deteriorated elements are included in two or more elements in the interprobe path read from the stack,
(Fourth overlap state determination)
If all degraded elements do not overlap at all with the elements in the interprobe path read from the stack,
There are four possible ways.

  From FIG. 13, among the elements determined to be deteriorated elements, the deteriorated elements 15, 17 and 29 of the independent group (d) are completely included in each element in the inter-probe path of DI read from the stack. Of the degraded elements 14, 16, 22, 27, 28 of the independent group (e), only a part (elements 14, 22, 28) is included in each element in the inter-probe path of DI read from the stack. The Therefore, in this case, the process proceeds to the case of the first overlap state determination.

<First overlap state determination>
FIG. 14 is a diagram showing a processing flow of first overlap state determination.
FIG. 15 is a diagram illustrating transition of the deterioration information table at the time of the first overlap state determination.
In the first overlap state determination process, first, the deteriorated element classification unit 13 is completely included in the deterioration information from the undetermined elements of each element in the inter-probe path of DI read from the stack. In order to delete the element (15, 17, 29) to be deleted, the area of the undetermined element in the deterioration information table is rewritten from the determined element area (step S301). The deteriorated element classifying unit 13 is a deteriorated element in which only some of the elements determined as deteriorated elements are duplicated among the undetermined elements of each element in the DI inter-probe path read from the stack. The redundant elements (elements in the independent group (e) are 14, 22, and 28) are reclassified from degraded elements to non-degraded elements (step S302). Further, the deteriorated element classifying unit 13 determines other undetermined elements (12, 13, 24, 25) in the DI inter-probe path read from the stack as non-degraded elements (step S303). Therefore, in the independent groups (d) and (e), the deterioration elements are 15, 17, 29, 16, and 27.
That is, according to this process, all the inter-probe paths in the independent groups (d) and (e) based on the independent group (b) have the same degradation value of 10 and are degraded only in one place of each independent group. Since it is regarded as having an element, it is not determined that the element is deteriorated at two different elements. Therefore, when an element in the inter-probe path of DI read from the stack completely includes a degraded element in another inter-probe path, it is determined as a degraded element, and the DI read from the stack When the elements in the inter-probe path include only a part of the deteriorated elements in the other inter-probe paths, it is necessary to regard a non-overlapping portion as a deteriorated element.

<Second overlap state determination>
FIG. 16 is a diagram illustrating a processing flow of second overlap state determination.
FIG. 17 is a diagram illustrating transition of the deterioration information table at the time of the second overlap state determination.
Further, when it is determined that there is no degraded element that is completely included in the elements in the inter-probe path read from the stack, the second overlap state determination is performed.
Regarding the second overlap state determination process, first, in the case where the independent group has a configuration as shown in FIG. 17 (f), all the elements of the path between probes of AB and the DE All elements in the inter-probe path are determined as degraded elements. Consider the case where the AE interprobe path is stored in the stack. There is no single degraded element that is completely contained in each element in the AE interprobe path stored in the stack. In such a case, the deteriorated element classification unit 13 classifies all undetermined elements in the inter-probe path read from the stack as deteriorated elements (step S401), and shifts from the undetermined element area of the deterioration information table to the deteriorated element area. rewrite. Further, the deteriorated element classification unit 13 sets the elements in the interprobe path read from the stack and the information of the overlapping deteriorated elements as one independent group (step S402).
In other words, according to this process, all the inter-probe paths in the independent group (f) have the same degradation value of 10 and are regarded as having degradation elements only at one location, and therefore are judged as degradation at two different elements. Never happen. However, since there is no deteriorated element that is completely included by the elements in the interprobe path read from the stack, it is unknown where the deterioration element is. Therefore, all elements in the inter-probe path once read from the stack are classified as possible degradation elements.

<Third overlap state determination>
FIG. 18 is a diagram showing a processing flow of third overlap state determination.
FIG. 19 is a first diagram showing a transition of the processing outline at the time of the third overlap state determination.
FIG. 20 is a first diagram showing a transition of the deterioration information table at the time of the third overlap state determination.
Further, when it is determined that two or more deteriorated elements are completely included in the elements in the inter-probe path read from the stack, the deteriorated element classifying unit 13 performs processing by the third overlap state determination. .
Regarding the third overlap state determination process, first, in the case where the independent group has a configuration as shown in FIG. 19G, as shown in the deterioration information table n1 in FIG. Some elements 1, 2, and 3 in the inter-probe path or AC inter-probe path and some elements 33 and 34 in the EF inter-probe path are determined to be deteriorated elements. At this time, it is assumed that the elements 4 and 5 in the A-B inter-probe path are determined as non-deteriorating elements, and the elements 6, 7, 8, and 9 in the A-C inter-probe path are determined as non-deteriorating elements. Further, it is assumed that the elements 30, 31, and 32 in the EF interprobe path are determined as non-deteriorating elements. Then, consider that the inter-probe path of A-F is stored in the stack. In this case, the elements in the A-F inter-probe path stored in the stack completely include all the deteriorated elements.

  In such a case, the deteriorated element classifying unit 13 determines whether there is an element constituted by only one inter-probe path among the elements determined to be deteriorated elements (step S501). Then, when there is an element configured only by one inter-probe path among the elements determined to be deteriorated elements, the deteriorated element classifying unit 13 determines that the element determined to be deteriorated is based on a plurality of inter-probe paths. The other elements to be configured are once returned from the deteriorated element to the undetermined element (step S502). Then, the deteriorated element classification unit 13 determines the elements 33 and 34 that are determined to be deteriorated elements and are configured only by one inter-probe path as the deteriorated elements as they are (step S503). Further, as shown in the deterioration information table n2 and the deterioration information table n3, the deterioration element classification unit 13 reclassifies the deterioration elements 1, 2, and 3 common to the plurality of inter-probe paths as non-deterioration elements (step S504). The non-deteriorating elements (4, 5, 6, 7, 8, 9) in the inter-probe paths having the deteriorating elements common to the plurality of inter-probe paths are temporarily set as undetermined elements (step S505), and then Are duplicated as non-degrading elements, and non-overlapping elements are classified as degrading elements (4, 5, 8, 9) (step S506), and the elements in the A-F interprobe path read from the stack Of these, elements 1, 2, 3, 6, 7, 20, 21, 22, 3 other than elements 33 and 34 determined to be deteriorated elements 2 is determined as a non-degraded element (step S507). Further, the deteriorated element classifying unit 13 sets A-F stored in the stack as one independent group (S508).

  That is, according to this process, all the inter-probe paths in the independent group (g) that is the source of the independent groups (1) and (2) have the same degradation value of 10, and each has a degradation element only at one location. Therefore, it is not determined that a deteriorated element exists in a plurality of different elements in one inter-probe path. Therefore, a degradation element that is completely contained in an element in the inter-probe path having the highest node stored in the stack, and the element determined to be the degradation element is only in one inter-probe path. In the case of a configured element (elements 33 and 34), it can be determined as a degraded element. Therefore, the elements in the inter-probe path stored in the stack other than the element determined as the deteriorated element can be determined as the non-deteriorated element. On the other hand, it is a deteriorated element that is completely contained in the element in the inter-probe path having the highest hierarchical node stored in the stack, and the element determined to be the deteriorated element is included in a plurality of inter-probe paths. If it is a common element, in the inter-probe path holding the degraded element, the element that overlaps the element in the inter-probe path having the highest node stored in the stack is returned to the non-degraded element. The elements that are not included are regarded as deteriorated elements.

FIG. 21 is a second diagram showing the transition of the processing outline at the time of the third overlap state determination.
FIG. 22 is a second diagram showing the transition of the deterioration information table at the time of the third overlap state determination.
Further, in the determination of whether there is an element constituted by only one inter-probe path among the elements determined as the deteriorated element in step S501, in the case of No, that is, all the elements determined as the deteriorated elements (see FIG. Deteriorating elements 1, 2, and 3 in 21 A-B or A-C interprobe paths and degrading elements 34, 35, and 36) in a DF or EF interprobe path If the element is a common element, the deteriorated element classification unit 13 performs a process of temporarily returning all the elements determined to be deteriorated elements from the deteriorated elements to the undetermined elements (deterioration information table n5 in FIG. 22; step S509). . Then, the deteriorated element classifying unit 13 converts the elements in the inter-probe path having the highest node stored in the stack and the elements of all the independent groups that have been returned to the undetermined elements as deteriorated elements. Determine (deterioration information table n6 in FIG. 22; step S510). Further, the deteriorated element classifying unit 13 sets A-F stored in the stack as one independent group (S511).

  That is, according to this process, all the inter-probe paths in each independent group have the same degradation value of 10, and each is regarded as having a degradation element at only one location. It is not determined that a deteriorated element exists in the element. Therefore, it is a deteriorated element that is completely contained in the element in the inter-probe path having the highest node stored in the stack, and all the elements determined as the deteriorating element are common to a plurality of inter-probe paths. In this case, since the deteriorated element is not known anywhere, all the elements in the independent group are elements that may be deteriorated elements.

<Fourth overlap state determination>
FIG. 40 is a diagram showing a process flow of fourth overlap state determination.
FIG. 41 is a diagram showing a transition of the processing outline at the time of the fourth overlap state determination.
FIG. 42 is a diagram illustrating transition of the deterioration information table at the time of the fourth overlap state determination.
Regarding the fourth overlap state determination process, first, when the independent group has a configuration as shown in FIG. 41, as shown in the deterioration information table of FIG. Some elements 4, 17, and 8 in the C inter-probe path and some elements 5, 19, and 9 in the DE inter-probe path or the DF inter-probe path are determined to be deteriorated elements. .
At this time, the elements 6, 14, 2, and 15 in the A-C inter-probe path are non-deteriorating elements, the elements 7 and 16 in the B-C inter-probe path, and the elements 18, 3, and 3 in the D-F inter-probe path. 21 and 11 are determined to be non-deteriorating elements, and the elements 20 and 10 in the inter-probe path of DE are determined to be non-deteriorating elements.
Then, consider that the inter-probe path of A-F is stored in the stack.
In this case, the elements in the A-F inter-probe path stored in the stack do not overlap with all the deteriorated elements.
Therefore, the degradation element classifying unit 13 keeps the degradation information table of the paths between the probes A-C, BC, DE, and DF, among the undetermined elements in the path between the probes A-F. The elements 12, 1, 13 are determined to be deteriorated elements, and the elements 6, 14, 2, 3, 21, 11 are determined to be non-deteriorated elements (step S1101). In other words, in step S1101, among the undetermined elements in the inter-probe path read from the stack, overlapping portions are set as non-degrading elements, and all non-overlapping elements are set as deterioration.
Further, the deteriorated element classification unit 13 sets A-F stored in the stack as one independent group (S1102).

  With the above processing, the classification of the degraded element or the non-degraded element is completed for each element of the interprobe path corresponding to the minimum degradation value.

FIG. 23 is a first diagram illustrating a process flow of the degradation information table reconstruction process.
Next, the deterioration / non-degradation of an element in the inter-probe path having another deterioration value (deterioration value other than the deterioration value 10 in this embodiment) in which the undetermined element remains is determined.
In this determination, first, the deteriorated element classifying unit 13 selects an inter-probe path having a minimum deterioration value (in this embodiment, an inter-probe path having a deterioration value of 20) among the inter-probe paths in which undetermined elements remain. Then, it is extracted from the deterioration information table (step S601). This extracted interprobe path information is referred to as target information. Then, the deteriorated element classifying unit 13 rewrites an element already determined to be a deteriorated element among the elements of the target information into the determined element region in the deterioration information table (step S602).
In addition, the deteriorated element classification unit 13 rewrites, among the elements of the target information, elements that have already been determined as non-deteriorated elements from the undetermined elements to the non-degraded element regions in the deterioration information table (step S603).
And the degradation element classification | category part 13 determines whether the undetermined element remains among the elements of target information by the above process (step S604). Then, the degraded element classification unit 13 determines whether the probe indicated by the target information from the degradation value of the interprobe path indicated by the target information in each of the case where the undetermined element remains and the case where the undetermined element does not remain. The degradation value of another inter-probe path having any of the inter-path elements as a degradation element is subtracted (step S605). Then, the deteriorated element classifying unit 13 determines that (1) undetermined elements remain and (2) undetermined elements remain when the subtraction result ≦ 0 according to the determination results of steps S604 and S605. If> 0, (3) no undetermined elements remain, subtraction result = 0, (4) no undetermined elements remain, and if subtraction result> 0, (5) undetermined elements If there is no remaining and the subtraction result <0, any one of the processes is performed.
Note that the degradation value subtraction in the table reconstruction process is performed in units of independent groups. That is, if there is one independent group and there are multiple paths that are discontinuously overlapped with the degraded elements included in the group, the subtraction is performed only once. When there are a plurality of different independent groups and there are overlapping paths, the degradation values held by each independent group are subtracted.

FIG. 24 is a second diagram illustrating a process flow of the degradation information table reconstruction process.
FIG. 25 is a first diagram illustrating a transition of the processing outline of the deterioration information table reconstruction processing.
FIG. 26 is a first diagram illustrating a transition of the deterioration information table in the deterioration information table reconstruction process.
A case where undetermined elements remain will be described below.
[If undetermined elements remain and subtraction result ≤ 0]
Now, from FIG. 25 and FIG. 26, when the independent group having elements 1, 2, and 3 and the independent group having elements 10, 11, 12, and 13 are determined to be deteriorated elements, the target Assume that the information elements have 1, 2, 3, 4, 5, 6, 11, 12, and 13. At this time, assuming that the degradation value of the target information is 20, the degradation value of the independent group having elements 1, 2, and 3 is 10, and the degradation value of the independent group having elements 10, 11, 12, and 13 is 10. When the process of subtracting the deterioration value of another independent group that holds one of the elements of the target information as the deterioration element from the deterioration value of the target information (20-10-10) = 0 (subtraction result ≦ 0) (step S701).
In this case, since the degradation value of the target information matches the degradation value of any element of the target information that has already been determined to be a degradation element and owns the element, in the inter-probe path indicated by the target information It can be considered that the deteriorated portion has already been determined. Of the undetermined elements in the interprobe path indicated by the target information, the deteriorated element classifying unit 13 determines elements that have been determined as deteriorated elements from the undetermined elements in the deterioration information table (elements 1, 2,. 3, 11, 12, 13) (step S 702), and the remaining undetermined elements (elements 4, 5, 6) are all rewritten to non-degraded elements (step S 703).

FIG. 27 is a third diagram illustrating a process flow of the deterioration information table reconstruction process.
FIG. 28 is a second diagram illustrating the transition of the processing outline of the degradation information table reconstruction processing.
FIG. 29 is a second diagram illustrating the transition of the deterioration information table in the deterioration information table reconstruction process.
[When undetermined elements remain and subtraction result> 0]
In the above-described processing, the value obtained by subtracting the deterioration value of another independent group having any one of the elements of the target information as the deterioration element from the deterioration value of the target information is 0 or less (subtraction result ≦ 0). However, there is a possibility that the result of subtraction is> 0. Processing in this case will be described with reference to FIGS. 27, 28, and 29. FIG.
28 and 29, in the independent group having elements 1, 2, and 3 and the independent group having elements 10, 11, 12, and 13, these elements are determined to be deteriorated elements. In this case, it is assumed that the elements of the target information have 1, 2, 3, 20, 21, 22, 23, 24, 25, 26, 11, 12, and 13. At this time, assuming that the degradation value of the target information is 30, the degradation value of the independent group having elements 1, 2, and 3 is 10, and the degradation value of the independent group having elements 10, 11, 12, and 13 is 10. The process of subtracting the degradation value of another independent group having any one of the elements of the target information as the degradation element from the degradation value of the inter-probe path indicated by the target information is (30-10-10) = 10, and the subtraction result is> 0 (step S801).

In this case, since the degradation value of the target information is larger than the sum of the degradation values of one or more other independent groups that partially hold the element of the target information as the degradation element, It can be estimated that there is a possibility that another deterioration portion having a deterioration value of 10 exists in the elements other than the element determined to be deteriorated. Accordingly, the deteriorated element classifying unit 13 changes the deterioration value of the target information to 10 in the deterioration information table (step S802), and the deteriorated element classifying unit 13 is an element already determined to be a deteriorated element in the target information. Is rewritten as a determined element (step S803), and among the elements in the target information, elements that have been determined as non-degraded elements in other independent groups are rewritten as non-degraded elements (step S804). This leaves some undetermined elements in the target information. The undetermined element is subjected to the degradation information table reconstruction process again in the next cycle by changing the degradation value of the target information.
In other words, once the table rebuilding is completed, the path with the smallest degradation value is extracted from the information remaining in the table, and the independent relationship is generated by determining the overlapping relationship between them. In addition, the above-mentioned “minimum deterioration value duplication determination” is performed, in which one overlapping portion in each independent group is determined to be deteriorated, including the execution of the process of storing the data in the stack. Thereafter, the table is further reconstructed. These two processes are repeated until all the paths are finished.

FIG. 30 is a fourth diagram illustrating a process flow of the degradation information table reconstruction process.
Next, a case where no undetermined element remains in the determination of whether an undetermined element remains among the elements of the target information described above will be described below.
[When there are no undetermined elements and subtraction result = 0]
In this case, as in the case where the undetermined element remains, the deterioration value of another independent group having any one of the elements of the target information as the deterioration element is subtracted from the deterioration value of the target information. If the subtraction result is 0 (step S901), the deterioration value of the target information matches the deterioration value of another independent group that has one of the elements of the target information as the deterioration element. In order to indicate this, since it can be considered that there is no other degradation portion in the inter-probe path indicated by the target information, the degradation element classification unit 13 ends the processing (step S902). And the degradation element classification | category part 13 repeats the above-mentioned process using the target information of another degradation value.

FIG. 31 is a third diagram illustrating the transition of the deterioration information table in the deterioration information table reconstruction process.
FIG. 32 is a fourth diagram illustrating a transition of the deterioration information table in the deterioration information table reconstruction process.
FIG. 33 is a fifth diagram illustrating a transition of the deterioration information table in the deterioration information table reconstruction process.
[When undetermined elements remain and subtraction result> 0 (1)]

  As shown in FIG. 31, when the degradation value of the inter-probe path A-C is 10, the degradation value of the inter-probe path BC is 10, and the degradation value of the inter-probe path AB is 20 (degradation information table p1). ) In the above-described minimum deterioration value duplication determination process, the interprobe path having the minimum deterioration value “10” is extracted (deterioration information table p2). In the inter-probe path A-C and the inter-probe path B-C, the elements 1 and 4 are respectively retained as overlapping elements, so that an independent group (1) of these two paths is generated (deterioration information table p3). ). Then, the overlapping elements 1 and 4 in the independent group (1) are determined as degraded elements, and the other elements 2 and 3 are determined as non-degraded elements (degradation information table p4). Here, when the degradation values of the paths between the probes to be judged have the same value and any of those paths overlaps, the element is a degradation element, and when they do not overlap, the element is a non-degradation element. The determination process is referred to as overlap determination process 1. When the overlap determination process 1 is performed, identification information indicating that the overlap determination process 1 has been performed is stored in association in the deterioration information table (corresponding to determination 1 in FIG. 31).

  Then, after the minimum deterioration value duplication determination process, the deterioration information table reconstruction process is started, but the deterioration element classification unit 13 includes the remaining information as shown in the deterioration information table p5 of FIG. The probe path A-B having the smallest deterioration value is determined as target information. Then, an overlap determination is made between the deterioration element of each inter-probe path belonging to the independent group (1) and the element of the inter-probe path AB indicated by the target information. Element 1 determined to be an element is determined as a determined element, and elements 2 and 3 are determined to be non-deteriorating elements. Therefore, in this state, there is no undetermined element in the target information (degradation information table p6 in FIG. 32). At this time, the degradation value of the target information is 20. The inter-probe path indicated by the target information, the inter-probe path A-C and the inter-probe path BC belonging to the independent group (1) have a common degradation element, and further, the inter-probe path A-C and the inter-probe path Since the path B-C has the minimum degradation value “10”, it can be considered that only one of the degradation elements 1 and 4 is a degradation element. Therefore, the degraded element classification unit 13 can consider that one common element may be a degraded element in the inter-probe path of the target information and each inter-probe path of the independent group (1). The degradation value “10” common to the inter-probe paths of the independent group is subtracted from the degradation value of the target information (degradation information table p6 in FIG. 32). In other words, if there is something common to each of the degradation elements in each inter-probe path in the independent group, the degradation value “10” common to each inter-probe path in the independent group from the degradation value “20” of the target information in this case. Only the value of "is subtracted. Then, since the subtraction result is “10”, the subtraction result> 0.

  In this case, since the elements 2 and 3 in the inter-probe path indicated by the target information are determined as non-deteriorating elements and the element 1 is determined as a deteriorating element, the subtraction result (= 10)> 0, that is, a surplus deterioration value cannot be assigned to the element in the interprobe path indicated by the target information, and the determination of deterioration / non-deterioration is contradictory. Therefore, it can be considered that the determination process for the target information before deterioration / non-deterioration is incorrect. Therefore, the degradation element classification unit 13 once returns all the elements in the inter-probe path indicated by the target information to undetermined elements, and also returns the degradation value managed in the degradation information table to 20 (degradation in FIG. 32). Information table p7). Moreover, since the degradation element classification | category part 13 may judge the degradation / non-degradation of the element in the independent group (1) compared with target information in error, each inter-probe path | pass of the said independent group (1). All the elements inside are returned to undetermined elements (deterioration information table p8 in FIG. 32).

  As a result of the contradiction in the determination of deterioration / non-deterioration as described above, when the determination is returned for each element for which the determination of deterioration / non-deterioration that caused the contradiction is made, the deterioration element classification unit 13 Determines by which overlap determination process each element of the independent group (1) compared with the target information has been determined to be deteriorated or not deteriorated. That is, the type of duplication determination process registered as information on the independent group (1) in the deterioration information table is confirmed. Now, in the deterioration information table p7 of FIG. 32, the overlap determination process 1 is registered in the information of the independent group (1) (item of determination 1 of FIG. 31). In the duplication determination process 1, other paths (pre-determination target paths) used for determination of deterioration / non-deterioration of the independent group (1) are not registered. In the case of the overlap determination process 1, the deteriorated element classification unit 13 determines that there is an error only in the determination of deterioration / non-deterioration of the independent group (1). Therefore, the deterioration element classification unit 13 determines whether the overlap determination process 1 is incorrect, and thus determines whether the overlap determination process 1 is deteriorated or not deteriorated. That is, the deteriorated element classification unit 13 determines that the elements 1 and 4 in the independent group (1) determined to be deteriorated elements in the previous duplication determination process 1 are non-deteriorated elements this time, and in the previous overlap determination process 1 The elements 2 and 3 in the independent group (1) determined to be non-degraded elements are determined to be degraded elements and divided into two independent groups (1) and (2) (degradation information table p9 in FIG. 33). Then, the deteriorated element classification unit 13 performs the deterioration information table reconstruction process again, and the elements in the interprobe paths indicated by the target information and the elements in the interprobe paths indicated by the independent groups (1) and (2) Duplicate judgment is performed. In the deterioration information table p9, the elements 1 and 4 are determined as non-deteriorating elements, and the elements 2 and 3 are determined as deterioration elements. Therefore, the deteriorated element classifying unit 13 rewrites the elements 2 and 3 that have already been determined to be deteriorated elements among the elements in the interprobe path indicated by the target information to the determined element column in the deterioration information table. Element 1 determined to be a non-deteriorating element is rewritten to the non-deteriorating element column in the deterioration information table.

  At this time, the degradation value of the target information is 20. The inter-probe path indicated by the target information, the inter-probe path AC belonging to the independent group (1), and the inter-probe path BC belonging to the independent group (2) have different degradation elements, and further, the inter-probe path. Since A-C and inter-probe path BC have the minimum deterioration value “10”, it is possible to determine that the determined deterioration elements 2 and 3 are deterioration elements separately. Therefore, the degraded element classification unit 13 can consider that two different elements are degraded elements in the inter-probe path of the target information and the inter-probe paths of the independent groups (1) and (2). The degradation value “10” of each independent group is subtracted from the degradation value “10”. That is, if the independent groups are different from each other, in this case, the degradation value “10” of each independent group is subtracted from the degradation value “20” of the target information. Then, (deterioration value 20 of target information) − (degradation value 10 of independent group (1)) − (degradation value 10 of independent group (2)) = 0. Thereby, the contradiction of deterioration and non-deterioration is solved. Therefore, the deteriorated element classification unit 13 ends the process (step S902). And the degradation element classification | category part 13 repeats the above-mentioned process using the target information of another degradation value.

FIG. 34 is a third diagram illustrating the transition of the processing outline of the degradation information table reconstruction processing.
FIG. 35 is a sixth diagram illustrating the transition of the deterioration information table in the deterioration information table reconstruction process.
FIG. 36 is a seventh diagram illustrating a transition of the deterioration information table in the deterioration information table reconstruction process.
FIG. 37 is an eighth diagram illustrating a transition of the deterioration information table in the deterioration information table reconstruction process.
FIG. 38 is a ninth diagram illustrating a transition of the deterioration information table in the deterioration information table reconstruction process.
[If undetermined elements do not remain and subtraction result> 0 (2)]
Next, among the elements in the target information described above, it is a case where there is no undetermined element remaining in the determination of whether the undetermined element remains. From the degradation value of the target information, Another example when the result of subtracting the deterioration value of another independent group having any one of the deterioration elements is larger than 0, that is, when the subtraction result> 0 will be described with reference to FIGS. To do.
34 and 35, the independent group (1) having the elements 1 and 22 and the independent group (2) having the elements 10, 11, and 12 are all determined to be deteriorated elements. And all the elements included in the inter-probe path having the elements 1, 22, 23, 24, 25, 11, 12 and the inter-probe path having the elements 1, 22, 23, 24, 25, 11, 10 Assume that it is a determination element (deterioration information table q1 in FIG. 35). In such a situation, the deteriorated element classification unit 13 starts the deterioration information table reconstruction process, and determines the inter-probe path having the elements 1, 22, 23, 24, 25, 11, 12 as the first target information. (Deterioration information table q2 in FIG. 35). It is assumed that the determination of the independent group (1) is the overlap determination of the overlap determination process 1.

  The deteriorated element classifying unit 13 selects elements (1, 22, 11, 12) that have already been determined as deteriorated elements in the independent groups (1) and (2) among the elements of the first target information. In FIG. 35, the column of the undecided element is rewritten to the column of the judged element (degradation information table q3 in FIG. 35). Further, the degradation values of the independent information (1) and (2) as the determination targets are subtracted from the degradation value 20 of the target information, respectively, and the degradation value of the target information is updated to 0. In addition, since this determination compares the target information having different deterioration values with the independent groups (1) and (2), this determination is registered in association with the target information in the deterioration information table p3 as the overlap determination process 2. (Determination item in FIG. 35). In addition, the information of the independent group (1) and the independent group (2) including the element used as the determination target in determining deterioration / non-deterioration of the element in the target information is registered in the deterioration information table in association with the target information. (Deterioration information table q3). And since the deterioration value of 1st target information was updated with 0, the deterioration element classification | category part 13 is the element (23,24,25) which remained without determining with a deterioration element among the elements of 1st target information. ) Cannot be determined as a degraded element. Therefore, these elements 23, 24, and 25 are determined as non-degraded elements, and are rewritten from the undetermined element column to the non-degraded element column (degradation information table q3).

  Next, the deteriorated element classification unit 13 performs inter-probe between the probes having the elements 1, 22, 23, 24, 25, 11, and 10 remaining in the undetermined elements of the deteriorated information table as the next deterioration information table reconstruction process. A path is determined as second target information (degradation information table q4). The degradation value of the interprobe path indicated by the second target information is “30”. Then, the deteriorated element classifying unit 13 is an element (1, 22, 11, 10) that has already been determined to be a deteriorated element among the elements of the second target information, among other elements of the inter-probe path in the deterioration information table. Is rewritten from the undetermined element column to the determined element column (degradation information table q5 in FIG. 36). Further, the deteriorated element classifying unit 13 determines the remaining elements (23, 24, 25) that are not determined to be deteriorated elements among the elements in the second target information as non-deteriorated elements, The column is rewritten to the column of non-degraded elements (degradation information table q5 in FIG. 36).

  If it is determined by the above processing whether or not undetermined elements remain among the elements in the second target information, no undetermined elements remain.

  At this time, the degradation value of the second target information is 30, the degradation value of the independent group (1) having the elements 1 and 22 that are degradation elements is 10, and the independent value having the elements 10, 11, and 12 that are degradation elements. Since the degradation value of the group (2) is 10, the degradation value of another inter-probe path having any one of the elements of the second target information as the degradation element from the degradation value of the second target information. When the process of subtracting is performed, (30-10-10) = 10 (the bottom row of the deterioration information table q5 in FIG. 36). That is, among the elements of the target information, there is no undetermined element remaining in the determination of whether the undetermined element remains. From the degradation value of the target information, the element of the interprobe path indicated by the target information The result of subtracting the degradation value of another inter-probe path having any one of them as a degradation element is subtraction result> 0.

  In this case, since the elements 23, 24, and 25 in the inter-probe path indicated by the second target information are determined as non-deteriorating elements, and the elements 1, 22, 11, and 10 are determined as deteriorating elements, the undetermined elements Although there is no subtraction, the subtraction result (= 10)> 0, that is, a surplus deterioration value cannot be assigned to the element in the interprobe path indicated by the second target information, and deterioration / non-deterioration The judgment is inconsistent. Therefore, it can be considered that the determination process before the deterioration / non-deterioration for the second target information is incorrect. Therefore, the degraded element classification unit 13 once returns all the elements in the inter-probe path indicated by the second target information to the undetermined elements, and also the degradation value of the second target information managed by the degradation information table. Return to 30 (deterioration information table q6). Then, the deteriorated element classifying unit 13 determines an inter-probe path in which the determination of deterioration / non-deterioration is inconsistent with respect to the remaining deterioration value of the second target information. In this determination, it is only necessary to determine that the other inter-probe paths that have been recently determined are contradictory when determining whether the element of the second target information is deteriorated or not deteriorated. Then, there is a possibility that the determination of deterioration / non-deterioration of each element in the inter-probe path having the elements 1, 22, 23, 24, 25, 11, 12 that is inconsistent with the second target information is incorrect. Judge that there is. Therefore, the deteriorated element classifying unit 13 returns all the elements in the interprobe path to undetermined elements (deterioration information table q7 in FIG. 36).

  Then, as a result of the contradiction in the determination of deterioration / non-deterioration as described above, when the determination is returned for each element for which the determination of deterioration / non-deterioration that caused the contradiction is made, the deterioration element classification unit 13 Other inter-probe paths (pre-determination target paths) that are subject to determination in the determination of deterioration / non-degradation of each element in the inter-probe path having elements 1, 22, 23, 24, 25, 11, and 12 that have caused inconsistencies ). In the deterioration information table, independent groups (1) and (2) are registered as pre-determination target paths in the determination target items. Therefore, the deteriorated element classifying unit 13 compares each element in the interprobe path having the elements 1, 22, 23, 24, 25, 11, and 12 inconsistent with the independent groups (1) and (2). Then, the independent group (2) of the interprobe paths not included in the interprobe paths having the elements 1, 22, 23, 24, 25, 11 and 12 is extracted. Then, the elements in the interprobe path indicated by the independent group (2) are compared with the interprobe paths having the elements 1, 22, 23, 24, 25, 11, and 12 in which the contradiction has occurred. Among the elements in the inter-probe path shown in 2), among the elements 10, 11, and 12 determined as the deteriorated elements, between the probes having the elements 1, 22, 23, 24, 25, 11, and 12 in which contradiction has occurred. The elements 11 and 12 that overlap the path are determined as non-degraded elements (degradation information table q8 in FIG. 37).

  Next, the deteriorated element classifying unit 13 again determines whether the inter-probe path having the contradictory elements 1, 22, 23, 24, 25, 11, and 12 and the independent groups (1) and (2) are duplicated. And the inter-probe path degradation information table reconstruction process having the elements 1, 22, 23, 24, 25, 11, and 12 in which inconsistencies occur is performed. At this time, among the elements 1, 22, 23, 24, 25, 11, and 12 in which the contradiction has occurred, the elements 1 and 22 have already been determined to be deteriorated elements. Since elements 11 and 12 have already been determined to be non-degraded elements, the elements 11 and 12 are rewritten in the column of non-degraded elements (degradation information table q9 in FIG. 37). In addition, since the independent group having the elements 1 and 22 determined to be determined is only (1), the degradation value of the independent group (1) is set to the elements 1, 22, 23, 24, 25, and 11 in which the contradiction occurs. , 12 subtracted from the degradation value of the inter-probe path, the degradation value of 20−10 = 10 is the remaining element of the inter-probe path of the elements 1, 22, 23, 24, 25, 11, 12 where the contradiction has occurred. 23, 24 and 25 are registered as deterioration values.

  Next, the deteriorated element classifying unit 13 performs duplication determination on the elements in the interprobe path indicated by the second target information with other interprobe paths in the deterioration information table. Thereby, the deteriorated element classifying unit 13 changes the elements 1, 22, and 10 that have already been determined to be deteriorated elements from the elements indicated by the second target information from the undetermined element column to the determined element column. The elements 11 and 12 that have already been determined to be rewritten and non-degraded elements are rewritten from the non-determined element column to the non-degraded element column (degradation information table q10 in FIG. 37). Since there are two independent groups (1) and (2) having the elements 1, 22 and 10 determined to have been determined, the deterioration values of the independent groups (1) and (2) are set to the second value. Subtracting from the degradation value of the inter-probe path of the target information, a degradation value of 30-10-10 = 10 is registered as the degradation value of the remaining elements 23, 24, 25 of the inter-probe path of the second target information. The

  Next, the degradation element classification unit 13 identifies information in the degradation information table that is not an independent group (degradation information table q11 in FIG. 38), and performs a minimum degradation value duplication determination process on the information. . At this time, since the information between two probe paths that are not independent groups in the deterioration information table has a common element, the information between the two probe paths is set as an independent group (3) (FIG. 38). Degradation information table q12). Then, among the undetermined elements in the independent group (3), the overlapping elements 23, 24, and 25 are rewritten from the undetermined element column to the deteriorated element column. At this time, if there is a non-overlapping element, a process of rewriting from the undecided element column to the non-degraded element column is performed (degradation information table q13 in FIG. 38).

  As a result, the contradiction is resolved in the relationship between the total degradation value of each independent group and the degradation value of the original path between probes. Therefore, the deteriorated element classification unit 13 ends the process (step S902). And the degradation element classification | category part 13 repeats the above-mentioned process using the target information of another degradation value.

FIG. 39 is a fourth diagram illustrating a transition of the processing outline of the deterioration information table reconstruction processing.
[If undetermined elements do not remain and subtraction result <0]
Next, in the determination of whether or not an undetermined element remains among the elements of the target information described above, there is no undetermined element remaining, and any of the elements of the target information is determined based on the degradation value of the target information. A case where the result of subtracting the deterioration value of another independent group having K as a deterioration element is smaller than 0, that is, the case where the subtraction result <0 will be described with reference to FIG.

  Now, as shown in the topology of (1) of FIG. 39, it has elements 1, 2, and 4 and has a group (L) in which the degradation value is 30, and elements 1, 3, and 4, and the degradation value is The group (M) that is 50 and the elements 1, 2, and 3 that have a degradation value of 60 are registered in the degradation information table, and the elements of these groups are undetermined elements. To do. In this case, since the deterioration value of the group (L) is the smallest, the minimum deterioration value duplication determination is performed only with this group (L). Since the group having the smallest deterioration value is only this group (L), all the elements (1, 2, 4) of the group (L) are once determined to be deterioration elements. Then, since all the elements (1, 2, 4) of the group (L) are determined to be deteriorated elements, the deterioration value 30 of the group (L) is determined. Thus, in the reconstruction process of the deterioration information table, the group (L The deterioration value of M) is updated to 20 by 50-30 in the deterioration information table ((5) in FIG. 39). Similarly, the degradation value of group (N) is updated to 30 by 60-30 in the degradation information table ((4) in FIG. 39).

  Next, in the group (M) in which the undetermined element remains and the deterioration value becomes the minimum (20) in the deterioration information table, since the elements 1 and 4 have already been determined to be the deterioration element, the determination is made to the determined element. As a result, the element 3 in the group (M) is once determined to be the deteriorated element having the deterioration value 20 ((8) in FIG. 39). As a result, the deterioration value of the group (N) is updated to 10 by 60-30-20 in the deterioration information table ((9) in FIG. 39). However, all the elements of the original undetermined elements 1, 2, and 3 of the group (N) have already been determined as deteriorated elements, and therefore, the deterioration value 10 stored in the area of the undetermined elements of the group (N). The information of element 2 is inconsistent with the determination results of other groups (L) and groups (M). Therefore, it is determined that the previous deterioration information table reconstruction process (6), (7) in FIG. 39 is incorrect, and the deterioration values of the group (M) and the group (N) are respectively set to the original 50, 60. Returning to step 2, the deterioration information table redetermination processing of the group (M) and the group (L) is performed. At this time, the overlapping element (1, 4) is a non-degrading element, and the non-overlapping element (3) is a degrading element. That is, in the group (M), it is determined that the deterioration value is 3 and the non-deterioration element is 1, 4 with the deterioration value 50 ((15) in FIG. 39).

  Next, the group (N) is identified as the target information, and the degradation information table reconstruction process is performed for the group (N). Elements 1, 2, and 3 that have already been determined to be deteriorated elements in the group (N) serving as the target information are rewritten as determined elements in the deterioration information table. That is, the undetermined element of group (N) is not left. Further, the degradation values of the other groups (L) and (M) having the elements in the group (N) as degradation elements are subtracted from the degradation value 60 of the group (N) of the target information. Then, the degradation value 60 of the group (N) −the degradation value 30 of the group (L) −the degradation value 50 of the group (M) = − 20. In other words, this is a case where there is no undetermined element remaining in the determination of whether the undetermined element remains among the elements in the group indicated by the target information. From the degradation value of the group indicated by the target information, When the result of subtracting the deterioration value of another group having any one of the elements of the group indicated by the target information as a deterioration element is smaller than 0, that is, the subtraction result <0.

  In such a case, next, in the deterioration information table reconstruction process, the subtraction result (−20) is another group having any one of the elements of the group (N) indicated by the target information as the deterioration element. In addition to the degradation values of (L) and (M), the degradation value of group (L) is 10 ((19) in FIG. 39), and the degradation value of group (M) is 30 ((19) in FIG. 39). Further, the absolute value 20 of the subtraction result (−20) is assigned to the element 1 determined to be non-degraded in the group (N) indicated by the target information ((19) in FIG. 39). With the above processing, the degradation value 30 of the original group (L), the degradation value 50 of the group (M), and the degradation value 60 of the group (N) are assigned as shown in the diagram of (19) of FIG. Thus, the determination processing of each group (L), (M), (N) is completed without contradiction.

  Then, until there is no undetermined element in each group, the above-described minimum deterioration value duplication determination and deterioration information table reconstruction process are repeated to classify the deterioration element / non-deterioration element for each deterioration information of each group. Then, the above-described one cycle process is repeated at a predetermined interval. The deteriorated element classifying unit 13 registers a value (determination value) of “1” in the one-cycle classification result table in association with an element determined to be a deteriorated element, and 1 cycle for an element determined to be a non-degraded element. The values of the classification result table “−1” are registered in association with each other. Then, the degradation element estimation unit 14 adds the value of each element in the one-cycle classification result table to the total estimation result table (FIG. 7) every time one cycle of processing is completed. At this time, the deteriorated element estimation unit 14 assigns an integer value α to “1” assigned to each element in the one-cycle classification result table and an integer value β (α> β to “−1”). ) Are added to each (dynamic weighting is performed) and added to the corresponding element in the total estimation result table. When the total determination value becomes a negative value as a result of the subtraction (addition of -β value) process, the value is changed to “0”.

Thus, by changing the dynamic weighting, it can be estimated as a location where intermittent degradation (failure with a low occurrence frequency of communication delay and packet loss) occurs.
In addition, according to the above-described processing, since deterioration / non-degradation is determined using the link and the node as different elements, it is possible to perform the processing for estimating a deteriorated part in which the link and the node are distinguished.

  In addition, the above-mentioned degradation location estimation apparatus 1 has a computer system inside. Each process described above is stored in a computer-readable recording medium in the form of a program, and the above process is performed by the computer reading and executing the program. Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

  The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, what is called a difference file (difference program) may be sufficient.

DESCRIPTION OF SYMBOLS 1 ... Degradation location estimation apparatus 2 ... Probe 3 ... Router 4, 5 ... Terminal 10 ... Network topology information storage part 11 ... Probe information receiving part 12 ... Deterioration element extraction part 13 ... Degraded element classification unit 14 ... Degraded element estimation unit 15 ... Degradation information table storage unit 16 ... One cycle classification result table storage unit 17 ... Total estimation result table

Claims (27)

Topology information storage means for storing topology information indicating a connection relationship of each element indicating either a node or a link in the communication network;
Based on packet information sent from a terminal in the communication network, each element constituting a path through which the packet information passes is determined based on the packet information and the topology information.
A degradation value determining means for determining a degradation value of a path through which the packet information passes, based on the packet information pair acquired at each of the transmission source side and the transmission destination side;
For each path in the communication network through which the packet information has passed, the deterioration information table creating means for storing each element constituting the path and the deterioration value in association with each other in a deterioration information table;
Using a deterioration determination threshold value for determining deterioration or non-deterioration, all elements recorded in the deterioration information table in association with deterioration values equal to or lower than the deterioration determination threshold value and other packet information that matches the element A deterioration / non-deterioration determination means for determining an element in the path as a non-deteriorating element;
The degradation location estimation apparatus characterized by comprising. Classifying deterioration values for each path of the packet information, and among each path group having the same deterioration value, a minimum deterioration value path specifying means for specifying a path group having a minimum deterioration value;
A minimum degradation value duplication determination unit that determines an element that overlaps each path in the path group that is the minimum degradation value as a degradation element, and that determines a non-overlapping element as a non-degradation element;
The deterioration location estimation apparatus according to claim 1, comprising: The minimum deterioration value duplication determination means includes
Among each path in the path group that is the minimum degradation value, the owned element is shared with other paths, and is an independent group consisting of a plurality of paths that are connected by the shared path , Until an independent group in which there is an overlapping element in all of a plurality of paths can be specified, a path having a node closest to the root in the tree structure indicated by the topology information is sequentially removed from the path group having the minimum degradation value. Temporarily store it on the stack,
Thereafter, an element that overlaps each path remaining in the path group having the minimum deterioration value is determined as a deterioration element, and an element that does not overlap is determined as a non-deterioration element.
Whether the elements in the path temporarily stored in the stack include the elements of each path remaining in the path group determined as the deteriorated element, sequentially determining from the path temporarily stored in the stack, The elements in the path temporarily stored in the stack completely include the degraded element of one path among the elements of each path remaining in the path group, and only a part of the degraded elements of other paths. Only the elements that overlap the path temporarily stored in the stack among the deteriorated elements of the other paths that include only the part are re-determined as non-degraded elements, and are temporarily stored in the stack. The deterioration location estimation apparatus according to claim 2, wherein an undetermined element in the path is determined as a non-deteriorating element. The minimum deterioration value duplication determination means includes
Among each path in the path group that is the minimum degradation value, the owned element is shared with other paths, and is an independent group consisting of a plurality of paths that are connected by the shared path , Until an independent group in which there is an overlapping element in all of a plurality of paths can be specified, a path having a node closest to the root in the tree structure indicated by the topology information is sequentially removed from the path group having the minimum degradation value. Temporarily store it on the stack,
Thereafter, an element that overlaps each path remaining in the path group having the minimum deterioration value is determined as a deterioration element, and an element that does not overlap is determined as a non-deterioration element.
Whether the elements in the path temporarily stored in the stack include the elements of each path remaining in the path group determined as the deteriorated element, sequentially determining from the path temporarily stored in the stack, If the elements in the path temporarily stored in the stack do not include any of the degraded elements of all the paths of the respective paths remaining in the path group, the elements in the path temporarily stored in the stack All the undecided elements are determined to be degradation elements. The degradation location estimation apparatus of Claim 2 characterized by the above-mentioned. The minimum deterioration value duplication determination means includes
Among each path in the path group that is the minimum degradation value, the owned element is shared with other paths, and is an independent group consisting of a plurality of paths that are connected by the shared path , Until an independent group in which there is an overlapping element in all of a plurality of paths can be specified, a path having a node closest to the root in the tree structure indicated by the topology information is sequentially removed from the path group having the minimum degradation value. Temporarily store it on the stack,
Thereafter, an element that overlaps each path remaining in the path group having the minimum deterioration value is determined as a deterioration element, and an element that does not overlap is determined as a non-deterioration element.
Whether the elements in the path temporarily stored in the stack include the elements of each path remaining in the path group determined as the deteriorated element, sequentially determining from the path temporarily stored in the stack, The elements in the path temporarily stored in the stack include the degradation elements of all the paths among the elements of each path remaining in the path group,
When there is an element in which the deteriorated element among the elements of each path remaining in the path group is constituted only by elements in one path,
Among the elements of the respective paths remaining in the path group, the deteriorated element is re-determined as a non-degraded element, and the deteriorated element constituted by the elements in the plurality of paths is determined by the elements in the plurality of paths. Re-determine the non-degrading element of each path having the degrading element configured as a degrading element,
Furthermore, it determines with all the undecided elements in the path | pass temporarily stored in the said stack being a non-degraded element. The degradation location estimation apparatus of Claim 2 characterized by the above-mentioned. The minimum deterioration value duplication determination means includes
Among each path in the path group that is the minimum degradation value, the owned element is shared with other paths, and is an independent group consisting of a plurality of paths that are connected by the shared path , Until an independent group in which there is an overlapping element in all of a plurality of paths can be specified, a path having a node closest to the root in the tree structure indicated by the topology information is sequentially removed from the path group having the minimum degradation value. Temporarily store it on the stack,
Thereafter, an element that overlaps each path remaining in the path group having the minimum deterioration value is determined as a deterioration element, and an element that does not overlap is determined as a non-deterioration element.
Whether the elements in the path temporarily stored in the stack include the elements of each path remaining in the path group determined as the deteriorated element, sequentially determining from the path temporarily stored in the stack, The elements in the path temporarily stored in the stack include the degradation elements of all the paths among the elements of each path remaining in the path group,
In the case where all of the degradation elements of the respective elements remaining in the path group are configured by elements in a plurality of paths,
The degradation location estimation apparatus according to claim 2, wherein all elements of each path remaining in the path group and elements in the path temporarily stored in the stack are determined as degradation elements. In the deterioration information table, a path having an element for which determination of deterioration or non-deterioration is undetermined and having a small deterioration value is acquired as target information,
When the path indicated by the target information has an element already determined as a degraded element in another path, the element is determined to be a degraded element, and has an element already determined as a non-degraded element in another path Determines that the element is a non-degraded element,
As a result, when there is still an undetermined element among the elements in the path indicated by the target information, the element in the path indicated by the target information is determined as a deteriorated element from the deterioration value of the path indicated by the target information. Subtracting the degradation value of the other path held as a result, and determining whether the subtraction result is less than 0 or greater than 0,
When the subtraction result is larger than 0, the remaining elements as undetermined among the elements in the path indicated by the target information are determined as undetermined elements as they are, and from the degradation value of the path indicated by the target information, A deterioration information table restructuring unit that determines a value obtained by subtracting a deterioration value of another path that holds an element in the path indicated by the target information as a deterioration element as a new deterioration value of the path indicated by the target information;
The deterioration location estimation apparatus according to any one of claims 2 to 6, further comprising: In the deterioration information table, a path having an element for which determination of deterioration or non-deterioration is undetermined and having a small deterioration value is acquired as target information,
When the path indicated by the target information has an element already determined as a degraded element in another path, the element is determined to be a degraded element, and has an element already determined as a non-degraded element in another path Determines that the element is a non-degraded element,
As a result, when there is still an undetermined element among the elements in the path indicated by the target information, the element in the path indicated by the target information is determined as a deteriorated element from the deterioration value of the path indicated by the target information. Subtracting the degradation value of the other path held as a result, and determining whether the subtraction result is less than 0 or greater than 0,
When the subtraction result is 0 or less, a deterioration information table reconstructing unit that determines all the elements remaining as undetermined among the elements in the path indicated by the target information as non-deteriorating elements;
The deterioration location estimation apparatus according to any one of claims 2 to 6, further comprising: In the deterioration information table, a path having an element for which determination of deterioration or non-deterioration is undetermined and having a small deterioration value is acquired as target information,
When the path indicated by the target information has an element already determined as a degraded element in another path, the element is determined to be a degraded element, and has an element already determined as a non-degraded element in another path Determines that the element is a non-degraded element,
As a result, when an undetermined element does not exist among the elements in the path indicated by the target information, the element in the path indicated by the target information is determined as a deteriorated element from the deterioration value of the path indicated by the target information. And subtracting the degradation value of the other path held as a result to determine whether the subtraction result is 0, a value less than 0, or a value greater than 0.
If the subtraction result is 0, the deterioration information table reconstructing means for ending determination of deterioration / non-deterioration of the path indicated by the target information and determining deterioration / non-deterioration of the path indicated by the next target information When,
The deterioration location estimation apparatus according to any one of claims 2 to 6, further comprising: In the deterioration information table, a path having an element for which determination of deterioration or non-deterioration is undetermined and having a small deterioration value is acquired as target information,
If the path indicated by the target information has an element that has already been determined to be a deteriorated element in another determination target path in the other deterioration information table, the element is determined to be a deteriorated element, and other elements in the other deterioration information tables When there is an element that has already been determined to be a non-deteriorating element in the determination target path, a first deterioration / non-deteriorating determination process is performed to determine that element as a non-deteriorating element,
As a result, when an undetermined element does not exist among the elements in the path indicated by the target information, the element in the path indicated by the target information is determined as a deteriorated element from the deterioration value of the path indicated by the target information. And subtracting the degradation value of the other path held as a result to determine whether the subtraction result is 0, a value less than 0, or a value greater than 0.
If the subtraction result is a value greater than 0, the last step is performed to determine the deterioration / non-degradation of all elements in the inter-probe path indicated by the target information and the elements in the inter-probe path indicated by the target information. The determination with all the elements in the determination target path compared to is returned to the undetermined element,
If there is no other previous determination target path used for determination of deterioration / non-degradation of the determination target path, again with respect to the returned interprobe paths, in the first deterioration / non-degradation determination process, A deterioration information table reconstructing unit that determines the determined element as a non-deteriorating element, and determines an element determined as a non-deteriorating element in the first deterioration / non-deteriorating determination process as a deteriorating element;
The deterioration location estimation apparatus according to any one of claims 2 to 6, further comprising: In the deterioration information table, a path having an element for which determination of deterioration or non-deterioration is undetermined and having a small deterioration value is acquired as target information,
If the path indicated by the target information has an element that has already been determined to be a deteriorated element in another determination target path in the other deterioration information table, the element is determined to be a deteriorated element, and other elements in the other deterioration information tables If there is an element that has already been determined to be a non-degraded element in the determination target path, a second deterioration / non-degradation determination process is performed to determine that element as a non-degrading element
As a result, when an undetermined element does not exist among the elements in the path indicated by the target information, the element in the path indicated by the target information is determined as a deteriorated element from the deterioration value of the path indicated by the target information. And subtracting the degradation value of the other path held as a result to determine whether the subtraction result is 0, a value less than 0, or a value greater than 0.
If the subtraction result is a value greater than 0, the last step is performed to determine the deterioration / non-degradation of all elements in the inter-probe path indicated by the target information and the elements in the inter-probe path indicated by the target information. The determination with all the elements in the determination target path compared to is returned to the undetermined element,
When there is another previous determination target path used for determining deterioration / non-degradation of the determination target path, the determination target among the elements in the previous determination target path not included in the element in the determination target path An element that overlaps an undetermined element in the path is determined as a non-degrading element,
Degradation information table reconstructing means for determining an undetermined element of an element in the determination target path and a duplicate element of the target information as a degraded element, and a non-overlapping element as a non-degraded element;
The deterioration location estimation apparatus according to any one of claims 2 to 6, further comprising: In the deterioration information table, a path having an element for which determination of deterioration or non-deterioration is undetermined and having a small deterioration value is acquired as target information,
When the path indicated by the target information has an element already determined as a degraded element in another path, the element is determined to be a degraded element, and has an element already determined as a non-degraded element in another path Determines that the element is a non-degraded element,
As a result, when an undetermined element does not exist among the elements in the path indicated by the target information, the element in the path indicated by the target information is determined as a deteriorated element from the deterioration value of the path indicated by the target information. And subtracting the degradation value of the other path held as a result to determine whether the subtraction result is 0, a value less than 0, or a value greater than 0.
When the subtraction result is less than 0, the deterioration value after subtraction in the target information is added to the deterioration value of another path that holds any element in the path indicated by the target information as a deterioration element. The degradation value of the other path having any one of the elements in the path indicated by the target information as a degradation element is determined, and the element determined to be non-degradation in the target information is subtracted from the target information. A deterioration information table reconstruction means for assigning an absolute value of the deterioration value;
The deterioration location estimation apparatus according to any one of claims 2 to 6, further comprising: The identification information of each element and the determination value for the element determined to be the deterioration element are recorded in association with each other, and each time the processes of the minimum deterioration value duplication determination means and the deterioration information table reconstruction means are repeated, A total judgment value calculating means for calculating a total judgment value of each element by adding a weighted value to the judgment value for the element judged to be a deteriorated element;
The deterioration location estimation apparatus according to any one of claims 7 to 12, further comprising: The topology information storage means of the degradation point estimation device stores topology information indicating the connection relationship of each element indicating either a node or a link in the communication network,
Based on the packet information sent from the terminal in the communication network, the element in the path of the degradation point estimation apparatus determines each element constituting the path through which the packet information passes, the packet information and the topology information. Based on
The degradation value determination means of the degradation point estimation device determines a degradation value of a path through which the packet information passes based on the pair of packet information acquired on each of the transmission source side and the transmission destination side,
The degradation information table creating means of the degradation location estimation device associates each element constituting the path with the degradation value in the degradation information table for each path in the communication network through which the packet information has passed. Remember,
Degradation / non-degradation determining means of the degradation point estimation device is recorded in the degradation information table in association with a degradation value equal to or lower than the degradation determination threshold using a degradation determination threshold for determining degradation or non-degradation. A degradation location estimation method, characterized in that all elements and elements in the path of other packet information matching the element are determined as non-degradation elements. The minimum degradation value path identification means of the degradation location estimation device classifies the degradation value for each path of the packet information, identifies a path group that has the minimum degradation value among each path group that has the same degradation value,
The minimum degradation value duplication determination means of the degradation location estimation apparatus determines an element that overlaps each path in the path group that is the minimum degradation value as a degradation element, and determines a non-overlapping element as a non-degradation element. The degradation location estimation method according to claim 14, wherein: The minimum degradation value duplication determination means of the degradation location estimation device is:
Among each path in the path group that is the minimum degradation value, the owned element is shared with other paths, and is an independent group consisting of a plurality of paths that are connected by the shared path , Until an independent group in which there is an overlapping element in all of a plurality of paths can be specified, a path having a node closest to the root in the tree structure indicated by the topology information is sequentially removed from the path group having the minimum degradation value. Temporarily store it on the stack,
Thereafter, an element that overlaps each path remaining in the path group having the minimum deterioration value is determined as a deterioration element, and an element that does not overlap is determined as a non-deterioration element.
Whether the elements in the path temporarily stored in the stack include the elements of each path remaining in the path group determined as the deteriorated element, sequentially determining from the path temporarily stored in the stack, The elements in the path temporarily stored in the stack completely include the degraded element of one path among the elements of each path remaining in the path group, and only a part of the degraded elements of other paths. Only the elements that overlap the path temporarily stored in the stack among the deteriorated elements of the other paths that include only the part are re-determined as non-degraded elements, and are temporarily stored in the stack. The deterioration location estimation method according to claim 15, wherein undecided elements in the path are determined as non-degraded elements. The minimum degradation value duplication determination means of the degradation location estimation device is:
Among each path in the path group that is the minimum degradation value, the owned element is shared with other paths, and is an independent group consisting of a plurality of paths that are connected by the shared path , Until an independent group in which there is an overlapping element in all of a plurality of paths can be specified, a path having a node closest to the root in the tree structure indicated by the topology information is sequentially removed from the path group having the minimum degradation value. Temporarily store it on the stack,
Thereafter, an element that overlaps each path remaining in the path group having the minimum deterioration value is determined as a deterioration element, and an element that does not overlap is determined as a non-deterioration element.
Whether the elements in the path temporarily stored in the stack include the elements of each path remaining in the path group determined as the deteriorated element, sequentially determining from the path temporarily stored in the stack, If the elements in the path temporarily stored in the stack do not include any of the degraded elements of all the paths of the respective paths remaining in the path group, the elements in the path temporarily stored in the stack All the undecided elements are determined to be degradation elements. The degradation location estimation method of Claim 15 characterized by the above-mentioned. The minimum degradation value duplication determination means of the degradation location estimation device is:
Among each path in the path group that is the minimum degradation value, the owned element is shared with other paths, and is an independent group consisting of a plurality of paths that are connected by the shared path , Until an independent group in which there is an overlapping element in all of a plurality of paths can be specified, a path having a node closest to the root in the tree structure indicated by the topology information is sequentially removed from the path group having the minimum degradation value. Temporarily store it on the stack,
Thereafter, an element that overlaps each path remaining in the path group having the minimum deterioration value is determined as a deterioration element, and an element that does not overlap is determined as a non-deterioration element.
Whether the elements in the path temporarily stored in the stack include the elements of each path remaining in the path group determined as the deteriorated element, sequentially determining from the path temporarily stored in the stack, The elements in the path temporarily stored in the stack include the degradation elements of all the paths among the elements of each path remaining in the path group,
When there is an element in which the deteriorated element among the elements of each path remaining in the path group is constituted only by elements in one path,
Among the elements of the respective paths remaining in the path group, the deteriorated element is re-determined as a non-degraded element, and the deteriorated element constituted by the elements in the plurality of paths is determined by the elements in the plurality of paths. Re-determine the non-degrading element of each path having the degrading element configured as a degrading element,
The degradation location estimation method according to claim 15, further comprising: deciding all undecided elements in the path temporarily stored in the stack as non-degraded elements. The minimum degradation value duplication determination means of the degradation location estimation device is:
Among each path in the path group that is the minimum degradation value, the owned element is shared with other paths, and is an independent group consisting of a plurality of paths that are connected by the shared path , Until an independent group in which there is an overlapping element in all of a plurality of paths can be specified, a path having a node closest to the root in the tree structure indicated by the topology information is sequentially removed from the path group having the minimum degradation value. Temporarily store it on the stack,
Thereafter, an element that overlaps each path remaining in the path group having the minimum deterioration value is determined as a deterioration element, and an element that does not overlap is determined as a non-deterioration element.
Whether the elements in the path temporarily stored in the stack include the elements of each path remaining in the path group determined as the deteriorated element, sequentially determining from the path temporarily stored in the stack, The elements in the path temporarily stored in the stack include the degradation elements of all the paths among the elements of each path remaining in the path group,
In the case where all of the degradation elements of the respective elements remaining in the path group are configured by elements in a plurality of paths,
The degradation point estimation method according to claim 15, wherein all elements of each path remaining in the path group and elements in the path temporarily stored in the stack are determined as degradation elements. The degradation information table reconstruction means of the degradation location estimation device is:
In the deterioration information table, a path having an element for which determination of deterioration or non-deterioration is undetermined and having a small deterioration value is acquired as target information,
When the path indicated by the target information has an element already determined as a degraded element in another path, the element is determined to be a degraded element, and has an element already determined as a non-degraded element in another path Determines that the element is a non-degraded element,
As a result, when there is still an undetermined element among the elements in the path indicated by the target information, the element in the path indicated by the target information is determined as a deteriorated element from the deterioration value of the path indicated by the target information. Subtracting the degradation value of the other path held as a result, and determining whether the subtraction result is less than 0 or greater than 0,
When the subtraction result is larger than 0, the remaining elements as undetermined among the elements in the path indicated by the target information are determined as undetermined elements as they are, and from the degradation value of the path indicated by the target information, The value obtained by subtracting the deterioration value of another path that holds the element in the path indicated by the target information as a deterioration element is determined as a new deterioration value of the path indicated by the target information. The degradation location estimation method according to claim 19. The degradation information table reconstruction means of the degradation location estimation device is:
In the deterioration information table, a path having an element for which determination of deterioration or non-deterioration is undetermined and having a small deterioration value is acquired as target information,
When the path indicated by the target information has an element already determined as a degraded element in another path, the element is determined to be a degraded element, and has an element already determined as a non-degraded element in another path Determines that the element is a non-degraded element,
As a result, when there is still an undetermined element among the elements in the path indicated by the target information, the element in the path indicated by the target information is determined as a deteriorated element from the deterioration value of the path indicated by the target information. Subtracting the degradation value of the other path held as a result, and determining whether the subtraction result is less than 0 or greater than 0,
16. If the subtraction result is 0 or less, all the elements remaining as undetermined among the elements in the path indicated by the target information are determined as non-degraded elements. 19. The degradation point estimation method according to any one of 19. The degradation information table reconstruction means of the degradation location estimation device is:
In the deterioration information table, a path having an element for which determination of deterioration or non-deterioration is undetermined and having a small deterioration value is acquired as target information,
When the path indicated by the target information has an element already determined as a degraded element in another path, the element is determined to be a degraded element, and has an element already determined as a non-degraded element in another path Determines that the element is a non-degraded element,
As a result, when an undetermined element does not exist among the elements in the path indicated by the target information, the element in the path indicated by the target information is determined as a deteriorated element from the deterioration value of the path indicated by the target information. And subtracting the degradation value of the other path held as a result to determine whether the subtraction result is 0, a value less than 0, or a value greater than 0.
When the subtraction result is 0, determination of deterioration / non-degradation of a path indicated by the target information is terminated, and determination of deterioration / non-deterioration of a path indicated by the next target information is performed. The deterioration location estimation method according to any one of claims 15 to 19. The degradation information table reconstruction means of the degradation location estimation device is:
In the deterioration information table, a path having an element for which determination of deterioration or non-deterioration is undetermined and having a small deterioration value is acquired as target information,
If the path indicated by the target information has an element that has already been determined to be a deteriorated element in another determination target path in the other deterioration information table, the element is determined to be a deteriorated element, and other elements in the other deterioration information tables When there is an element that has already been determined to be a non-deteriorating element in the determination target path, a first deterioration / non-deteriorating determination process is performed to determine that element as a non-deteriorating element,
As a result, when an undetermined element does not exist among the elements in the path indicated by the target information, the element in the path indicated by the target information is determined as a deteriorated element from the deterioration value of the path indicated by the target information. And subtracting the degradation value of the other path held as a result to determine whether the subtraction result is 0, a value less than 0, or a value greater than 0.
If the subtraction result is a value greater than 0, the last step is performed to determine the deterioration / non-degradation of all elements in the inter-probe path indicated by the target information and the elements in the inter-probe path indicated by the target information. The determination with all the elements in the determination target path compared to is returned to the undetermined element,
If there is no other previous determination target path used for determination of deterioration / non-degradation of the determination target path, again with respect to the returned interprobe paths, in the first deterioration / non-degradation determination process, The determined element is determined as a non-deteriorating element, and the element determined as a non-deteriorating element in the first deterioration / non-deteriorating determination process is determined as a deteriorating element. The method for estimating the deterioration location according to crab. The degradation information table reconstruction means of the degradation location estimation device is:
In the deterioration information table, a path having an element for which determination of deterioration or non-deterioration is undetermined and having a small deterioration value is acquired as target information,
If the path indicated by the target information has an element that has already been determined to be a deteriorated element in another determination target path in the other deterioration information table, the element is determined to be a deteriorated element, and other elements in the other deterioration information tables If there is an element that has already been determined to be a non-degraded element in the determination target path, a second deterioration / non-degradation determination process is performed to determine that element as a non-degrading element
As a result, when an undetermined element does not exist among the elements in the path indicated by the target information, the element in the path indicated by the target information is determined as a deteriorated element from the deterioration value of the path indicated by the target information. And subtracting the degradation value of the other path held as a result to determine whether the subtraction result is 0, a value less than 0, or a value greater than 0.
If the subtraction result is a value greater than 0, the last step is performed to determine the deterioration / non-degradation of all elements in the inter-probe path indicated by the target information and the elements in the inter-probe path indicated by the target information. The determination with all the elements in the determination target path compared to is returned to the undetermined element,
When there is another previous determination target path used for determining deterioration / non-degradation of the determination target path, the determination target among the elements in the previous determination target path not included in the element in the determination target path An element that overlaps an undetermined element in the path is determined as a non-degrading element,
20. The element according to claim 15, wherein an overlapping element of the target information with an undetermined element of the element in the determination target path is determined as a degraded element, and an element that does not overlap is determined as a non-degraded element. The degradation location estimation method described in 1. The degradation information table reconstruction means of the degradation location estimation device is:
In the deterioration information table, a path having an element for which determination of deterioration or non-deterioration is undetermined and having a small deterioration value is acquired as target information,
When the path indicated by the target information has an element already determined as a degraded element in another path, the element is determined to be a degraded element, and has an element already determined as a non-degraded element in another path Determines that the element is a non-degraded element,
As a result, when an undetermined element does not exist among the elements in the path indicated by the target information, the element in the path indicated by the target information is determined as a deteriorated element from the deterioration value of the path indicated by the target information. And subtracting the degradation value of the other path held as a result to determine whether the subtraction result is 0, a value less than 0, or a value greater than 0.
When the subtraction result is less than 0, the deterioration value after subtraction in the target information is added to the deterioration value of another path that holds any element in the path indicated by the target information as a deterioration element. The degradation value of the other path having any one of the elements in the path indicated by the target information as a degradation element is determined, and the element determined to be non-degradation in the target information is subtracted from the target information. The degradation location estimation method according to any one of claims 15 to 19, wherein an absolute value of a degradation value is assigned. The total judgment value calculation means of the degradation point estimation device is:
The identification information of each element and the determination value for the element determined to be the deterioration element are recorded in association with each other, and each time the processes of the minimum deterioration value duplication determination means and the deterioration information table reconstruction means are repeated, 26. The deterioration location estimation method according to claim 20, wherein a total determination value of each element is calculated by adding a weighted value to a determination value for an element determined to be a deterioration element. .   A program that causes a computer to function as the degradation point estimation apparatus according to any one of claims 1 to 13.

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