JP6040188B2 - Communication analysis apparatus and communication analysis method - Google Patents

Description

  The present invention relates to a communication analysis apparatus and a communication analysis method for analyzing a problem of call control software in a communication system.

  In recent years, various communication services have been provided. For example, IMS (IP Multimedia Subsystem), which provides multimedia services that combine call control, voice, video, and data communication, was established and standardized by 3GPP (3rd Generation Partnership Project), and NGN (Next Generation Network) (See, for example, Non-Patent Document 1).

  In NGN, SIP (Session Initiation Protocol) is applied as a call control protocol and has already been put into practical use. In order to realize further advanced services in the future, applications are being developed for various advanced services using SIP.

  In advanced services using SIP, overload tests and end-to-end communication system-wide stability tests are performed at the verification stage of software development to improve software quality and improve software generated during operation. The problem needs to be solved in a short time. When analyzing such a signal at the time of development or operation abnormality, the analysis can be efficiently performed by using an end-to-end sequence diagram.

  Analysis at the time of occurrence of an abnormality in such a communication system is performed in consideration of the state of occurrence of a large number of calls due to congestion during operation and the state of occurrence of a large number of background calls for an overload test in development verification. The “background call” is a call that is different from the test call and is being flown in a large amount in the background. In addition to this, it is necessary to analyze a wide range of nodes such as the subscriber accommodation call control device and the relay call control device from the end terminal of the communication system. Requires a lot of operation and time.

“3GPP TS 23.228 V12.2.0 (2013-09) Technical Specification 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; IP Multimedia Subsystem (IMS)”, [February 2014 Search], Internet (URL: http: //www.3gpp.org/DynaReport/23228.htm)

  As described above, the analysis of the cause at the time of occurrence of an abnormality in the communication system is complicated, and the analysis takes a long time.

  In view of the above problems, an object of the present invention is to easily analyze an abnormality in a communication system.

  In order to achieve the above object, a communication analysis apparatus according to the present invention is applied to a communication system that realizes incoming and outgoing calls between a plurality of terminals via a plurality of relay apparatuses, and a signal for incoming and outgoing calls is abnormal. When an error signal is changed due to the occurrence of an error, the device analyzes the abnormality, acquires signals transmitted / received by a plurality of relay devices relayed to establish a call between terminals, and extracts an error signal to be analyzed To collect the extracted error signal and all signals transmitted / received between a plurality of relay devices to establish a call between the source terminal and the destination terminal in relation to the error signal And a sequence creation unit that creates a sequence diagram of a signal between a source terminal and a destination terminal.

  According to the present invention, it is possible to easily analyze an abnormality in a communication system.

FIG. 1 is a schematic diagram illustrating a communication system. FIG. 2 is a block diagram illustrating the configuration of the communication analysis apparatus according to the embodiment. FIG. 3 is an example of capture data used by the communication analysis apparatus of FIG. FIG. 4 is an example of an error signal included in the capture data of FIG. FIG. 5 is an example of data stored in the communication analysis apparatus of FIG. FIG. 6 is a flowchart illustrating an example of a process in which the communication analysis apparatus in FIG. 2 stores error data. FIG. 7 is a flowchart for explaining an example of processing when the communication analysis apparatus of FIG. 2 displays list data. FIG. 8 is a flowchart for explaining an example of processing when the communication analysis apparatus of FIG. 2 displays a sequence diagram. FIG. 9 is a flowchart for explaining an example of a process in which the communication analysis apparatus in FIG. 2 extracts an error signal to be generated as a sequence diagram. FIG. 10 is an example of a sequence diagram generated by the communication analysis apparatus of FIG.

  Hereinafter, a communication analysis device and a communication analysis method according to an embodiment of the present invention will be described with reference to the drawings. The communication analysis apparatus according to the embodiment analyzes the cause when a software problem occurs in a communication system that realizes NGN. In the following description, the same components are denoted by the same reference numerals and description thereof is omitted.

<Background of the invention>
As an analysis of an abnormality in a general communication system, for example, sequence creation devices 10a to 10c as shown in FIG. 1 can be used. Here, in the communication system that is the target of the abnormality analysis, the terminals 20a and 20b are end-to-end, and a plurality of SIP servers 30a to 30c that realize connection by the terminals 20a and 20b are connected between the terminals 20a and 20b. Be placed. The first SIP server 30a and the third SIP server 30c are included in the “subscriber call control device”, and the second SIP server 30b is included in the “relay call control device”. Further, the terminals 20a and 20b may be terminals for verification tests or may be terminals for calls used by general users.

  In the method shown in FIG. 1, each of the sequence creation devices 10a to 10c uses the data acquired from the capture databases 40a to 40c that store the data obtained by monitoring the signals at the entrances and exits of the SIP servers 30a to 30c, respectively. A sequence diagram representing the communication state of the servers 30a to 30c is created. Moreover, the abnormality in a communication system can also be analyzed combining the sequence diagram which each sequence creation apparatus 10a-10c collected.

  First, it is necessary to distinguish between a normal sequence diagram and an abnormal sequence diagram from a plurality of sequence diagrams created in this way. Further, it is necessary for a tester to visually compare a plurality of sequence diagrams created by the respective SIP servers 30a to 30c, and to match the sequence at the time of abnormality of the entire communication system between the terminals 20a and 20b between the end and end. There is. Furthermore, the sequence diagram at the time of abnormality may include a problem already registered or a problem already solved. It is important to extract a new abnormal sequence diagram excluding such a sequence diagram.

<Embodiment>
As shown in FIG. 2, the communication analysis device 10 according to the embodiment can analyze an abnormality of the communication system with a single device. The communication analysis device 10 is connected to call information storage units 31a to 31c included in the SIP servers 30a to 30c, which are relay devices, and capture DBs 40a to 40c. As described above, the first SIP server 30a and the third SIP server 30c are subscriber call control devices, and the second SIP server 30b is a relay call control device. 2 shows an example in which the communication system includes only one relay call control device, but a configuration in which a call between terminals 20a and 20b is established by relaying a plurality of relay call control devices. But you can.

  The first call information storage unit 31a stores detailed call information (call information) used for charging the first SIP server 30a. The second call information storage unit 31b stores detailed call information used for charging the second SIP server 30b, and the third call information storage unit 31c is used for charging the third SIP server 30c. Store detailed information. The call detail information includes, for example, “Call ID” for specifying the call, “Call start / end time” for specifying the start and end times of the call by the call, “Calling number” for specifying the call originator, and incoming call It includes data such as “incoming number” that identifies the destination.

  The first capture DB 40a acquires each signal that enters and exits the first SIP server 30a, analyzes whether each signal is normal or abnormal (error), and stores data relating to the analysis result. As shown in FIG. 3A, according to the data stored in the first SIP server 30a, it can be seen that the normal signal is transmitted / received and the error signal 1 is transmitted / received.

  In addition, the second capture DB 40b stores data (FIG. 3B) obtained by analyzing whether the signal that enters and exits the second SIP server 30b is normal or abnormal. Further, the third capture DB 40c stores data (FIG. 3C) obtained by analyzing whether the signal that enters and exits the third SIP server 30c is normal or abnormal.

  For example, as shown in FIG. 4, each error signal includes an “error number” that identifies the type of error, a “calling number” that identifies the call originator, a “calling number” that identifies the destination of the call, “Call ID” for specifying “error signal transmission / reception time” for specifying the signal transmission / reception time, “error signal transmitting device” for identifying the device that transmitted the call, and “identifier for the device for receiving the call” Error signal receiver ".

  As illustrated in FIG. 2, the communication analysis device 10 includes a control unit 101, a filtering unit 102, a list display unit 103, and a sequence creation unit 104. Specifically, the communication analysis device 10 includes a CPU 100, a storage device 110, an input device 120 such as a keyboard and a mouse for inputting operation signals, an output device 130 such as a display and a printer for outputting operation screens and processing results, and a communication interface. 140 or the like. By executing the analysis program P stored in the storage device 110, the CPU 100 executes processing as the control unit 101, the filtering unit 102, the list display unit 103, and the sequence creation unit 104. Thereby, the error data D1 and the known data D2 are stored in the storage device 110.

  The filtering unit 102 acquires signal data stored in each of the capture DBs 40a to 40c at a predetermined timing such as periodically. Here, the filtering unit 102 acquires all signal data that has not been acquired in the past. Further, when the signal data is acquired, the filtering unit 102 extracts error signal data from the signal data, and stores the data as error data D1 in the storage device 110. The error signal is, for example, a signal such as 4XX (request error) or 5XX (server error) which is an error signal in SIP.

  When a display request signal for requesting display of list data that is a list of error signals is input via the input device 120, the list display unit 103 generates list data and outputs the list data to the output device 130. At this time, the display request signal includes the time of the error signal to be displayed. The list data includes, for example, an error signal identifier, the content of the error signal, the time when the error signal was transmitted and received, and the like. From this list data, it is possible to grasp the time at which the error signal is generated and what type of error has occurred.

  When a creation request signal for requesting creation of a sequence diagram representing the details of an abnormality is input via the input device 120, the sequence creation unit 104 receives a signal transmitted / received in association with a target signal transmitted / received in the communication system. To create a sequence diagram. Further, the creation request signal includes the time when the abnormality targeted by the sequence diagram to be created has occurred. Alternatively, the creation request signal may include an error signal identifier included in the list data displayed by the list display unit 103. The sequence creation unit 104 creates a sequence diagram regarding the error signal specified by the creation request signal. Here, when the necessary signal is not included in the error signal list d1, the sequence creation unit 104 accesses the call information storage units 31a to 31c, acquires necessary information, and includes it in the error signal.

  Here, when the “Call ID” is the same within 1 Call, the sequence creation unit 104 identifies the call by using “Call ID”, “Call start / end time”, and “Sending / receiving telephone number” as keys, and displays the sequence diagram. create. If the “Call ID” is not the same in B2BUA (Back-to-Back User Agent), the call is specified using “Call ID” and “From-tag” as keys, and a sequence is created.

  The control unit 101 executes control of the filtering unit 102, the list display unit 103, and the sequence creation unit 104 and various comparison determinations.

  As illustrated in FIG. 5A, the error data D1 includes an error signal list d1 that is a list of error signals and a sequence list d2 that is a list of sequence diagrams. This sequence diagram is created by the sequence creation unit 104 at a predetermined timing such as at the time of autonomous periodic activation.

  Further, the known data D2 includes a known error signal list d3 that is a list of known error signals and a known sequence list d4 that is a list of known sequence diagrams, as shown in FIG. 5B as an example. The known error signal is a signal related to an error that has occurred in the past.

  Below, each process performed with the communication analyzer 10 is demonstrated.

[Error data generation processing]
As shown in FIG. 6, the filtering unit 102 acquires signal data from each of the capture DBs 40a to 40c (S01).

  Subsequently, the filtering unit 102 extracts an error signal from the acquired data (S02). In the case of SIP, the error signal has a status code of 4XX (request error) or 5XX (server error).

  Thereafter, the filtering unit 102 generates the acquired error signal list as the error signal list d1, and stores the error signal list d1 in the storage device 110 (S03).

[List display processing]
As shown in FIG. 7, the list display unit 103 inputs a display request for requesting display of list data input via the input device 120 (S11). This display request includes the time range of the error signal to be displayed in the list data.

  Subsequently, the list display unit 103 extracts error signals transmitted and received at the time included in the display request (S12).

  Thereafter, the list display unit 103 generates list data in which the extracted error signals are listed (S13). At this time, the list display unit 103 may store the generated list data in the storage device 110.

  The list display unit 103 displays the generated list data on the output device 130 (S14).

[Sequence generation processing]
As shown in FIG. 8, the sequence creation unit 104 inputs a creation request for requesting creation of an error sequence diagram (S21). For example, the creation request is input to the user via the input device 120. Alternatively, the creation request is input via the input device 120 control unit 101 at a predetermined timing such as periodically set in advance. This creation request includes the error signal time range targeted by the sequence diagram desired to be created or the error signal identifier included in the list data.

  The sequence creation unit 104 extracts an error signal for creating a sequence diagram from the error signal list d1 (S22). The process of extracting the target error signal will be described later with reference to the flowchart shown in FIG.

  After that, the sequence creation unit 104 identifies the extracted error signal call (S23). Here, for calls that cannot be specified, the sequence creation unit 104 accesses the call information storage units 31a to 31c, and from the “call start / end time”, “calling number”, and “calling number” of the error signal to be sequenced. The call is specified and it is determined whether or not it is an extraction target.

  Specifically, the target call signal is acquired for all the SIP servers 30a to 30c related to the call source terminal 20a to the destination terminal 20b of a call across a plurality of SIP servers, and an end-to-end sequence diagram is created. . At this time, if the Call ID is the same within 1 call, the signal is specified using “Call ID” as a key as described above. On the other hand, when the Call ID is not the same as in B2BUA (Back-to-Back User Agent), a call across multiple servers is specified using “From-tag” as a key together with “Call ID”.

  Thereafter, the sequence creation unit 104 accesses the target capture DBs 40a to 40c, and acquires a signal related to the call identified in step S23 (S24). In addition, it is determined whether there is another related opposing SIP server, and as long as there is a related opposing SIP server (YES in S25), the process of step S24 is repeated. Here, the related opposing SIP server is an adjacent SIP server when a signal related to the target call passes. For example, in the example shown in FIG. 2, a signal is transmitted and received between the terminal 20a and the terminal 20b. In this case, the opposite server of the first SIP server 30a is the second SIP server 30b. The opposite servers of the second SIP server 30b are the first SIP server 30a and the third SIP server 30c.

  From the call source terminal 20a to the destination terminal 20b, the signals of all the SIP servers 30a to 30c that have passed through are acquired, and end-to-end sequence diagrams are created (S26).

  FIG. 10 shows an example of a sequence diagram created in the sequence creation unit 104. FIG. 10 is a sequence diagram illustrating a communication state in a communication system including a source terminal (source terminal) 20a, a destination terminal (terminated terminal) 20b, and SIP servers 30a to 30c. Here, since the calling terminal 20a makes a call, but the called terminal 20b has moved permanently, 301 (Moved Permanently) is returned, and the third SIP server 30c on the called side returns 503 (Service Unavailable) to the calling side. It is a sequence diagram in the case of cutting. By creating such a sequence diagram, it is possible to easily grasp that an error has occurred and the destination terminal 20b is permanently moving from place to place.

  Next, the sequence creation unit 104 compares the created sequence diagram with each of the known sequences 1 to n included in the known sequence list d4, and determines whether the error has occurred in the past depending on whether the sequence is the same or similar. Determine (S27). Even if the sequence creation unit 104 is not completely identical but is similar, the sequence creation unit 104 treats it as equivalent to a known sequence diagram. As a similar example, for example, when the number of SIP servers straddling, which is the number of SIP servers through which the signal passes, is different, or when the signal directions do not match (reverse direction).

  If they are not the same or similar, the sequence creation unit 104 adds the error signal as a known error signal to the known error signal list d3 of the storage device 110, and creates the created sequence diagram as a known sequence in the known sequence list of the storage device 110. It excludes from the event added to d4 (S28).

  The sequence creation unit 104 displays the corresponding error signal and error signal sequence diagram on the output device 130 (S29).

[Refine processing]
With reference to FIG. 9, the process of extracting a call for sequence creation in step S22 of FIG. 8 will be described. In the error signal list d1 of the error data D1, the sequence creation unit 104 has a plurality of error signals in a large amount (for example, a predetermined number such as 10 or more) in the same time zone (for example, within a predetermined time such as within 1 hour). The error signal generated under a plurality of conditions in the same time zone is excluded (YES in S31, S32). This is because there is a possibility that the error is caused not by a software error but by a system hardware or network failure.

  In addition, the sequence creation unit 104 uses a predetermined amount such as 10 or more from the remaining error signal under the same conditions at intervals rather than in the same time zone (for example, within a predetermined time such as within 1 hour) at the time of capture. If there is an error signal generated in the above), only 1 Call, that is, only one error signal is selected as a target for sequence creation, and the others are excluded (YES in S33, S34).

  As a result, error signals that are not excluded are targeted (S35).

  As described above, the communication analysis device 10 according to the embodiment extracts only the error signal from the large amount of signals including the normal signal and the error signal by the filtering unit 102, and forms the error signal list d1. Moreover, when creating list data and sequence diagrams, these are the creation targets. In this way, by extracting signals necessary for analysis from a large amount of signals, analysis processing can be facilitated.

  Further, the communication analysis device 10 does not create a sequence diagram for each of the SIP servers 30a to 30c, but creates one sequence diagram using signals of all the SIP servers 30a to 30c included in the communication system. Therefore, it is not necessary to combine a plurality of sequence diagrams, and analysis processing can be easily executed over a wide range of the entire communication system.

  Furthermore, the communication analysis apparatus 10 excludes the sequence diagram included in the known data D2 from display and storage. Therefore, by excluding an event that has already been registered as an error from the target, it is possible to reduce the burden on the verifier using the analysis process.

  As mentioned above, although this invention was demonstrated in detail using embodiment, this invention is not limited to embodiment described in this specification. The scope of the present invention is determined by the description of the claims and the scope equivalent to the description of the claims.

10 Communication analyzer 110 CPU
101 control unit 102 filtering unit (extraction unit)
103 List Display Unit 104 Sequence Creation Unit 110 Storage Device 120 Input Device 130 Output Device 140 Communication Interfaces 20a, 20b Terminals 30a-30c SIP Server (Relay Device)
40a-40c capture database

Claims (7)

A communication analysis device that is applied to a communication system that realizes call arrival and reception between terminals via a plurality of relay devices, and that analyzes the abnormality when a signal for call arrival and reception is changed to an error signal due to the occurrence of the abnormality Because
An extraction unit that acquires signals transmitted and received by a plurality of relay devices that are relayed to establish a call between the terminals, and extracts an error signal to be analyzed;
Collecting the extracted error signal and all signals transmitted and received between a plurality of relay devices for establishing a call between the source terminal and the destination terminal in relation to the error signal; A sequence creation unit for creating a sequence diagram of signals between the terminal and the destination terminal;
A communication analysis apparatus comprising: A known data storage unit for storing the sequence diagram created by the sequence creation unit;
When the newly generated sequence diagram is not included in the known data storage unit, the sequence creation unit adds the newly generated sequence diagram to the known data storage unit and outputs it to the output device. The communication analysis apparatus according to claim 1. The sequence creation unit excludes a predetermined number or more of error signals generated within a predetermined time from a plurality of extracted error signals from a sequence diagram creation target. 2. The communication analysis device according to 2. The sequence creation unit excludes, from among a plurality of extracted error signals, each error signal of a predetermined number or more under the same condition from a creation target of a sequence diagram. The communication analysis device described. An error data storage unit associated with the time of transmission and reception;
The communication according to any one of claims 1 to 4, wherein when the creation request including a time range is input, the sequence creation unit sets an error signal associated with the time range as a creation target of a sequence diagram. Analysis device. A list display unit for displaying list data including identifiers of error signals extracted by the extraction unit;
The communication analysis apparatus according to claim 1, wherein the sequence creation unit sets an error signal specified by an identifier selected from the list data as a creation target of a sequence diagram. Communication analysis method that is applied to a communication system that realizes call arrival and reception between terminals via a plurality of relay devices, and that analyzes the abnormality when the signal for call arrival and departure is changed to an error signal due to the occurrence of the abnormality Because
Obtaining signals transmitted / received by a plurality of relay devices relayed for establishment of a call between the terminals, and extracting an error signal to be analyzed;
Collecting the extracted error signal and all signals transmitted and received between a plurality of relay devices for establishment of a call between the originating terminal and the terminating terminal in relation to the error signal;
Creating a sequence diagram of signals between the source terminal and the destination terminal;
A communication analysis method characterized by comprising:

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