System and method for monitoring performance statistics in a communications network

• US 6,028,914 A
• Filed: 04/09/1998
• Issued: 02/22/2000
• Est. Priority Date: 04/09/1998
• Status: Expired due to Term

• Current Assignee: NetScout Systems Texas, LLC (NetScout Systems Incorporated)
• Original Assignee: Inet Technologies, Inc. (Fortive Corp.)
• Inventors: Ratakonda, Balaji, Kalyanpur, Gaurang, Lin, Lisan, Patterson, Timothy K.
• Primary Examiner(s): LOOMIS, PAUL A
• Application Number:
  US09/057,940
• Time in Patent Office: 684 Days
• Field of Search: 379/9, 379/10, 379/14, 379/15, 379/32, 379/34, 379/113, 379/133, 379/134, 379/136, 379/207
• US Class Current: 379/14
• CPC Class Codes: H04M 3/2263 Network management
• CPC Class Codes: H04Q 3/005 Personal communication services, e.g. provisions for portability of subscriber numbers

Abstract

A system is provided for monitoring the operation of switching nodes in a telephone network. A first monitor is provided which is operable to capture data on all of the connection links of a first switching node in the network. A second monitor is provided which is operable to capture data on all of the connection links of a second switching node. The first and second monitors capture selected telephone switching messages on the links of the nodes. Each monitor compiles either a primary or secondary record of switching messages pertaining to a particular call or transaction being routed by switching nodes. The primary record is maintained by the monitor which detects the first message which initiates a particular call or transaction. Subsequent messages pertaining to that call or transaction that are captured by the other monitor are compiled in a secondary record. During the call or at the completion of the call or transaction, selected messages stored in the secondary call record are transferred to the monitor containing the primary record by means of a communications bus connecting the two monitors. The composite record is then analyzed by the monitor containing the primary record to evaluate the performance of the telephone switch and to generate performance statistics for the network.

Claims

1. A monitoring system for use in a communications network in which call control information pertaining to a communication link carrying voice or data signals between system users pass through one or more network components, wherein said network components are geographically separated from each other, said monitoring system comprising:

processors associated with particular ones of said network components, said processors operable for receiving and temporarily storing therein selected call control information as said call control information passes through said associated network components, said stored call control information identifiable for a particular transaction, wherein said each of said processors comprise;

means for storing all selected call control information for a particular transaction in a unified list sorted by time of occurrence of said call control information;

means for communicating with other said processors, said communicating means permitting said processors to exchange data related to said particular transaction, wherein said processors comprise means for detecting said data having a same identifying code;

means for allowing said processors to identify one of said processors as a controlling processor for said particular transaction; and

means for combining said unified lists for all stored selected call control information for said particular transaction in said controlling processor.

2. The system of claim 1 further comprising:

means for generating transaction statistics using said unified lists of said selected call control information, wherein said statistics correspond to at least one of the following transactions in said network from a group consisting of;

Local Number Portability (LNP) transactions; and

CLASS related transactions.

3. The system of claim 2 wherein said statistics correspond to CLASS related transactions in said network.

4. The system of claim 1 wherein said processors further comprise:

means for combining lists of call control information, wherein said lists correspond to a single transaction in which associated messages have more than one identifier.

5. The system of claim 1 wherein said network components selected from the group consisting of:

Signaling Transfer Points (STPs);

Signaling End Points (SEPs);

Service Switching Point (SSP);

Signaling Point (SP); and

Signaling Control Point (SCP).

6. The system of claim 1 wherein said selected call control information is a subset of the calling protocol used in routing and controlling telephone calls.

7. The system of claim 6 wherein said subset includes a calling party identification, a called party identification and a communication network link identification for said communication link over which said communication is established and at least one field of data pertaining to operational aspects of the call.

8. The system of claim 4 further comprising:

a memory for storing a plurality of said unified lists; and

a communications bus for transferring said selected call control information among said processors.

9. The system of claim 8 further comprising a second communications bus for transferring said unified lists to a computer database for use in telephone system applications.

10. A system for monitoring statistics in a communications network having a plurality of Signaling Transfer Points (STPs), said network providing local number portability (LNP) capability to network users, said system comprising:

a plurality of monitoring units, each of said monitoring units coupled to one of said STPs and functioning to capture LNP data messages passing through said one of said STPs, wherein said data messages are associated with particular transactions on said network, said monitoring units comprising;

means for time stamping each of said data messages;

means for identifying said data messages corresponding to particular transactions; and

means for combining corresponding ones of said data messages in a call record for each of said particular transactions, wherein at least one of said data messages is selected from a group consisting of;

data messages having a same identifying code; and

data messages having more than one identifier; and

means for identifying one of said monitoring units as a controlling monitor for a particular transaction.

11. The system of claim 10 further comprising:

means for generating statistical information from a plurality of said call records, wherein statistical information is related to performance parameters of said communications network, and wherein said statistical information comprises the number of Transaction Control Application Part (TCAP) messages per point code per op-code per Subsystem Number (SSN) per Transaction Type Number (TTN).

12. The system of claim 10 wherein said statistical information comprises:

the number of TCAP messages per point code per op-code per SSN per error code.

13. The system of claim 10 wherein said statistical information comprises:

the number of Advanced Intelligent Network (AIN) messages per point code.

14. The system of claim 13 wherein said statistical information of the number of AIN messages per point code are further specified per op-code, wherein said op-code is selected from the group consisting of:

Automatic Code Gap (ACG);

Analyze Route;

Authorize Termination;

Disconnect;

Info Analyzed;

Request Report Basic Call Model (BCM) Event;

Send Notification; and

Termination Attempt.

15. The system of claim 10 wherein said statistical information comprises data selected from the group consisting of:

a number of LNP queries per point code;

a number of LNP queries if the Forward Call Indicator (FCI) bit is set on the Integrated Service User Part (ISUP) Initial Address Message (IAM) message and Generic Address Parameter (GAP) parameter indicates "Number Translated;

"

a number of LNP query failures per point code;

a ratio of LNP queries failed to LNP queries per point code; and

a number of calls wherein a switches'"'"' own Location Routing Number (LRN) is detected following an LNP query.

16. The system of claim 10 wherein said statistical information comprises data selected from the group consisting of:

a number of ISUP calls that are ported per point code;

a number of ISUP calls that are non-ported per point code;

a number of ISUP Release Message (REL) messages per point code for misrouted calls to a ported number;

a number of ISUP REL messages per point code for address incomplete; and

a number of ISUP REL messages per point code for invalid address format.

17. The system of claim 10 wherein said statistical information comprises data selected from the group consisting of:

a ratio of ported ISUP calls to total ISUP calls;

a ratio of non-ported ISUP calls to total ISUP calls;

a ratio of REL messages with a "Misrouted Call to a Ported Number" cause to ported ISUP calls; and

a ratio of REL messages with a "Invalid Address Format" cause to ported ISUP calls.

18. The system of claim 10 wherein said statistical information comprises data selected from the group consisting of:

a number of calls resulting in unallocated indication;

a number of calls resulting in "Unallocated Number" in the donor switch; and

a number of calls wherein GAP parameter indicates number translated with GAP digits missing.

19. A system for monitoring the performance characteristics of a telecommunications signaling network comprising:

means for detecting signaling messages that are routed through at least one switching component;

means for distinguishing among said detected signaling messages in order to associate each of said signaling messages with a particular call, wherein at least one of said signaling messages is selected from a group consisting of;

signaling messages having a same identifying code; and

signaling messages having more than one identifier;

means for compiling a call record for said particular call, wherein said call record comprises detected signaling messages associated with said particular call;

means for determining which of a plurality of monitoring units is an anchor monitor for said particular call, wherein each of said plurality of monitoring units maintain a partial call record for said particular call;

means for transferring said partial call records to said anchor monitor in order to compile a substantially complete call record for said particular call; and

means for compiling call statistics from a plurality of said substantially complete call records.

20. The system of claim 19 further comprising:

means for associating each of said detected signaling messages with a time code.

21. The system of claim 20 wherein said determining means further comprises:

means for identifying which of said monitoring units detected a first signaling message for said particular call.

22. The system of claim 19 further comprising:

means for displaying said call statistics to a user.

23. The system of claim 19 wherein said call statistics comprise:

a number of LNP queries for a certain type of call.

24. The system of claim 19 wherein said call statistics comprise:

a number of ported calls for a certain type of call.

25. The system of claim 19 wherein said call statistics comprise:

a number of non-ported calls for a certain type of call.

26. The system of claim 19 wherein said call statistics comprise:

a number of misrouted calls for a certain type of call.

27. The system of claim 19 wherein said call statistics comprise:

a ratio of ported calls to total calls.

28. The system of claim 19 wherein said call statistics comprise:

a ratio of non-ported calls to total calls.

29. A computer program product having a computer readable medium with computer program logic recorded thereon for use in a system for monitoring a telecommunications signaling network, said network having one or more switching components, the computer program product comprising:

means for storing selected information for a particular transaction in a unified list sorted by time of detection of said information;

means for communicating with processors, said communicating means permitting said processors to exchange data related to said particular transaction;

means for allowing said processors to identify one of said processors as an anchor processor for said particular transaction;

means for combining a plurality of unified lists for said particular transaction in said anchor processor, wherein said lists correspond to at least one of the following transactions from the group consisting of;

a single transaction in which associated messages have more than one identifier; and

a single transaction in which said processors detect a plurality of messages each having a same identifying code; and

means for generating transaction statistics using said unified lists of said selected call control information.

30. The system of claim 29 wherein said transaction statistics comprise:

the number of TCAP messages per point code per op-code per SSN per TTN.

31. The system of claim 29 wherein said transaction statistics comprise:

the number of TCAP messages per point code per op-code per SSN per error code.

32. The system of claim 29 wherein said transaction statistics comprise:

the number of AIN messages per point code.

33. The system of claim 32 wherein said transaction statistics of the number of AIN messages per point code are further specified per op-code, wherein said op-code is selected from the group consisting of:

ACG;

Analyze Route;

Authorize Termination;

Disconnect;

Info Analyzed;

Request Report BCM Event;

Send Notification; and

Termination Attempt.

34. The system of claim 29 wherein said transaction statistics comprise data selected from the group consisting of:

a number of LNP queries per point code;

a number of LNP queries if the FCI bit is set on the ISUP IAM message and GAP parameter indicates "Number Translated;

"

a number of LNP query failures per point code;

a ratio of LNP queries failed to LNP queries per point code; and

a number of calls wherein a switches'"'"' own LRN is detected following an LNP query.

35. The system of claim 29 wherein said transaction statistics comprise data selected from the group consisting of:

a number of ISUP calls that are ported per point code;

a number of ISUP calls that are non-ported per point code;

a number of ISUP REL messages per point code for misrouted calls to a ported number;

a number of ISUP REL messages per point code for address incomplete; and

a number of ISUP REL messages per point code for invalid address format.

36. The system of claim 29 wherein said transaction statistics comprise data selected from the group consisting of:

a ratio of ported ISUP calls to total ISUP calls;

a ratio of non-ported ISUP calls to total ISUP calls;

a ratio of REL messages with a "Misrouted Call to a Ported Number" cause to ported ISUP calls; and

a ratio of REL messages with a "Invalid Address Format" cause to ported ISUP calls.

37. The system of claim 29 wherein said transaction statistics comprise data selected from the group consisting of:

a number of calls resulting in unallocated indication;

a number of calls resulting in "Unallocated Number" in the donor switch; and

a number of calls wherein GAP parameter indicates number translated with GAP digits missing.

38. A method for monitoring the performance characteristics of a telecommunications signaling network comprising the steps:

detecting signaling messages that are routed through at least one switching component;

identifying each said detected signaling message as associated with a particular transaction;

compiling a call record for said particular transaction, wherein said call record comprises detected signaling messages associated with said particular transaction, and wherein said transaction corresponds to at least one of the following messages from the group consisting of;

associated messages that have more than one identifier; and

a plurality of messages each having a same identifying code; and

determining which of a plurality of monitoring units is an anchor monitor for said particular transaction.

39. The method of claim 38 wherein said determining step further comprises the steps of:

broadcasting a time-stamped signaling message to other monitoring units;

receiving time-stamped signaling messages from said other monitoring units; and

comparing said broadcast time-stamped signaling messages and said received time-stamped signaling messages to determine which of said monitors detected an earliest signaling message.

40. The method of claim 38 wherein said determining step further comprises the steps of:

broadcasting a time-stamped signaling message from a first monitoring unit to other monitoring units;

waiting a predetermined period of time for said other monitoring units to broadcast corresponding signaling messages; and

assigning said first monitoring unit to be said anchor unit, if said other monitoring units do not broadcast said corresponding signaling messages with said predetermined period.

41. The method of claim 40 wherein said predetermined period of time is configurable.

42. The method of claim 38 further comprising the steps of:

transferring partial call records from non-anchor monitors to said anchor monitor in order to compile a substantially complete call record for said particular call; and

compiling transaction statistics from a plurality of said substantially complete call records.

43. The method of claim 42 further comprising the step of:

associating each of said detected signaling messages with a time code.

44. The method of claim 43 wherein said determining step further comprises the step of:

identifying which of said monitoring units detected a first signaling message for said particular call.

45. The method of claim 42 wherein said transaction statistics comprise:

a number of LNP queries for a certain type of call.

46. The method of claim 42 wherein said transaction statistics comprise:

a number of ported calls for a certain type of call.

47. The method of claim 42 wherein said transaction statistics comprise:

a number of non-ported calls for a certain type of call.

48. The method of claim 42 wherein said transaction statistics comprise:

a number of misrouted calls for a certain type of call.

49. The method of claim 42 wherein said transaction statistics comprise:

a ratio of ported calls to total calls.

50. The method of claim 42 wherein said transaction statistics comprise:

a ratio of non-ported calls to total calls.

51. A method of monitoring a pair of telephone switches operating in mated relationship to one another such that a plurality of call control messages pertaining to a separate communication network carrying voice or data signals of a particular call or transaction over a selected communication channel between a calling party and a called party will always pass through one or both of the pair of switches, the method comprising the steps of:

capturing the call control messages of the particular transaction with a pair of monitoring devices, wherein each monitoring device is associated with one of the pair of telephone switches;

storing the captured call control messages in a memory table in each monitoring device;

establishing the memory table in one of the monitoring devices as a primary memory table and the memory table in the other device as a secondary memory table;

truncating the captured call control messages in the secondary memory table into a subset record comprising calling party identification, called party identification and communication network link identification;

transferring the subset record to the primary memory table;

merging the subset record with the captured call control messages stored in the primary memory table that correspond to the particular transaction based on the calling party identification, called party identification and communication network link identification to thereby create a unified call record; and

generating signaling network performance statistics from a plurality of said unified call records.

52. A monitoring system for use in a communications network in which call control information pertaining to a communication link carrying voice or data signals between system users pass through one or more network components, wherein said network components are geographically separated from each other, said monitoring system comprising:

processors associated with particular ones of said network components, said processors operable for receiving and temporarily storing therein call control information as said call control information passes through said associated network components, said stored calling information identifiable for a particular transaction, wherein said each of said processors comprise;

means for time stamping call control information for a particular transaction;

means for allowing said processors to identify one of said processors as an anchor processor for said particular transaction using said time-stamped information; and

means for communicating, from non-anchor monitors to said anchor monitor, all stored call control information for said particular transaction, wherein said call control information comprises said voice or data signals selected from a group consisting of;

said signals having a same identifying code; and

said signals having more than one identifier.

53. A monitoring system for use in a communications network in which call control information pertaining to a communication link carrying voice or data signals between system users pass through one or more network components, wherein said network components are geographically separated from each other, said monitoring system comprising:

processors associated with particular ones of said network components, said processors operable for receiving and temporarily storing therein call control information as said call control information passes through said associated network components, said stored calling information identifiable for a particular call, wherein said each of said processors comprise;

means for time stamping call control information for a particular call;

means for allowing said processors to identify one of said processors as and anchor processor for said particular call using said time-stamped information; and

means for communicating, from non-anchor monitors to said anchor monitor, all stored call control information for said particular call, wherein said call control information comprises said voice or data signals selected from a group consisting of;

said signals having a same identifying code; and

said signals having more than one identifier.