Methods and systems for routing messages in a communications network

• US 6,836,477 B1
• Filed: 12/23/1999
• Issued: 12/28/2004
• Est. Priority Date: 12/23/1999
• Status: Expired due to Term

• Current Assignee: Tekelec
• Original Assignee: Tekelec
• Inventors: Rao, Raghavendra Gopala, McCann, Thomas Matthew, West, Robert Fulton Jr.
• Primary Examiner(s): Duong, Frank
• Assistant Examiner(s): Jagannathan, Melanie
• Application Number:
  US09/471,946
• Time in Patent Office: 1,832 Days
• Field of Search: 370/310.1, 370/310.2, 370/351-356, 370/338, 370/349, 370/400, 370/401, 370/389, 455/445
• US Class Current: 370/352
• CPC Class Codes: H04Q 3/0025 Provisions for signalling
• CPC Class Codes: H04W 88/184 Messaging devices, e.g. message centre

Abstract

A flexible routing node for re-directing signaling messages in a communications network is disclosed. Re-direction or re-routing of signaling message packets is accomplished through the use of a range or block-based database in conjunction with an exception-based database. The range-based routing instruction databases incorporates a data structure that maps ranges or blocks of mobile identification numbers (MINs) to a single destination network address, while the exceptions database stores any exceptions to these range or block-based rules. The pair of routing databases is implemented such that, when a signaling message is received that requires re-direction, the exception-based database is queried first. If a match is found in the exceptions database, the signaling message is modified using the returned routing instructions and transmitted into an associated communication network. If no match is found in the exception-based database, a default query is performed against the range-based database. The signaling message is then modified using the routing instructions returned by the range-based database and transmitted into an associated communication network.

Claims

1. A network element for routing a data packet through a communications network, the network element comprising:

(a) a communication module capable of transmitting a data packet to and receiving the data packet from a communications network;

(b) a range-based database containing first packet routing rule records wherein each first packet routing rule record is indexed by a range or block of identification numbers;

(c) an exception-based database containing second packet routing rule records wherein each second packet routing rule record is indexed by a single identification number, wherein at least one of the second packet routing rule records is indexed by a single identification number that is outside of the ranges or blocks of identification numbers by which the first packet routing rule records are indexed;

(d) a database subsystem controller for accessing at least one of the range- and exception-based databases to extract routing information for the data packet; and

(e) a routing function for routing the data packet to its intended destination using the routing information.

2. The network element of claim 1 wherein the data packet is a Signaling System 7 (SS7) signaling message.

3. The network element of claim 1 wherein the data packet contains an Interim Standard-41 (IS-41) protocol message.

4. The network element of claim 1 wherein the data packet contains a Global System for Mobile Communications (GSM) Mobile Application Part (MAP) protocol message.

5. The network element of claim 1 wherein the communications network is a Signaling System 7 (SS7) network.

6. The network element of claim 1 where the communication network is an Internet Protocol (IP) network.

7. The network element of claim 1 wherein the communication network is an Asynchronous Transfer Mode (ATM) network.

8. The network element of claim 1 wherein the communication module is a signaling system 7 (SS7) Link Interface Module (LIM).

9. The network element of claim 1 wherein the communication module is an Internet protocol (IP) Database Communication Module (DCM).

11. The network element of claim 1 wherein each second packet routing rule record includes network address information in the form of a signaling system 7 (SS7) destination point code.

12. The network element of claim 1 wherein each second packet routing rule record includes network address information in the form of an Internet Protocol (IP) destination address number.

13. The network element of claim 1 wherein each second packet routing rule record includes an entity address.

14. The network element of claim 1 wherein each first packet routing rule record includes an entity address.

15. The network element of claim 1 wherein each first packet routing rule record includes network address information in the form of a signaling system 7 (SS7) destination point code.

16. The network element of claim 1 wherein each first packet routing rule record includes network address information in the form of an Internet Protocol (IP) destination address and port number.

21. The network element of claim 1 where the database subsystem controller incorporates the routing information returned from the range or exception-based database into the data packet.

22. The network element of claim 21 wherein the routing information incorporated into the data packet includes a point code (PC).

23. The network element of claim 21 wherein the routing information incorporated into the data packet includes an IP address.

24. The network element of claim 21 wherein the routing information incorporated into the data packet includes an entity address.

25. The network element of claim 21 wherein the routing information incorporated into the data packet includes a routing indicator.

26. The network element of claim 21 where the routing information incorporated into the data packet includes a subsystem number (SSN).

27. The network element of claim 1 wherein the identification numbers are mobile identification numbers.

28. The network element of claim 27 wherein the mobile identification numbers are International Mobile Subscriber Identity (IMSI) numbers.

29. The network element of claim 27 wherein the mobile identification numbers are Mobile Station Integrated Services Digital Network (MSISDN) numbers.

30. The network element of claim 27 wherein the mobile identification numbers are Mobile Global Title numbers.

31. The network element of claim 27 wherein the mobile identification numbers are ANSI-41 Mobile Identification Numbers.

32. The network element of claim 27 wherein the mobile identification numbers are ANSI-41 Mobile Directory Numbers.

10. A network element for routing a data packet through a communications network, the network element comprising:

(a) a communication module capable of transmitting a data packet to and receiving the data packet from a communications network;

(b) a range-based database containing first packet routing rule records wherein each first packet routing rule record is indexed by a range or block of identification numbers;

(c) an exception-based database containing second packet routing rule records wherein each second packet routing rule record is indexed by a single identification number; and

(d) a database subsystem controller for accessing at least one of the range- and exception-based databases to extract routing information for the data packet, wherein the second packet routing rule records in the exception-based database represent exceptions to the first packet routing rule records in the range-based database.

17. A network element for routing a data packet through a communications network, the network element comprising:

(a) a communication module capable of transmitting a data packet to and receiving the data packet from a communications network;

(b) a range-based database containing first packet routing rule records wherein each first packet routing rule record is indexed by a range or block of identification numbers;

(c) an exception-based database containing second packet routing rule records wherein each second Packet routing rule record is indexed by a single identification number; and

(d) a database subsystem controller for accessing at least one of the range- and exception-based databases to extract routing information for the data packet, wherein the database subsystem controller initially directs the data packet to the exception-based database and performs a lookup in the exception-based database based on a mobile identification number in the data packet to locate the routing information.

18. A network element for routing a data packet through a communications network, the network element comprising:

(a) a communication module capable of transmitting a data packet to and receiving the data packet from a communications network;

(b) a range-based database containing first packet routing rule records wherein each first packet routing rule record is indexed by a range or block of identification numbers, wherein each first packet routing rule record includes network address information in the form of an Internet Protocol (IP) destination address and port number;

(c) an exception-based database containing second packet routing rule records wherein each second packet routing rule record is indexed by a single identification number; and

(d) a database subsystem controller for accessing at least one of the range- and exception-based databases to extract routing information for the data packet, wherein the database subsystem controller directs the data packet to the range-based database in response to failing to locate the routing information in the exception-based database.

19. A network element for routing a data packet through a communications network, the network element comprising:

(a) a communication module capable of transmitting a data packet to and receiving the data packet from a communications network;

(b) a range-based database containing first packet routing rule records wherein each first packet routing rule record is indexed by a range or block of identification numbers;

(c) an exception-based database containing second packet routing rule records wherein each second packet routing rule record is indexed by a single identification number; and

(d) a database subsystem controller for accessing at least one of the range- and exception-based databases to extract routing information for the data packet, where the database subsystem controller performs number conditioning operations on contents of the data packet prior to accessing the range- or exception-based database.

20. A network element for routing a data packet through a communications network, the network element comprising:

(a) a communication module capable of transmitting a data packet to and receiving the data packet from a communications network;

(b) a range-based database containing first packet routing rule records wherein each first packet routing rule record is indexed by a range or block of identification numbers;

(c) an exception-based database containing second packet routing rule records wherein each second packet routing rule record is indexed by a single identification number; and

(d) a database subsystem controller for accessing at least one of the range- and exception-based databases to extract routing information for the data packet, wherein the database subsystem controller determines an entity type for a destination of the data packet prior to accessing the range- or exception-based database.

33. A method of routing a data packet through a communications network, the method comprising:

(a) receiving a data packet from a first communications network;

(b) performing a primary search of an exception-based routing rules database using an identification number contained within the data packet;

(c) in response to failing to locate an entry corresponding to the identification number in the exception-based routing rules database, performing a secondary search of a range-based routing rules database using the identification number contained in the data packet;

(d) modifying the data packet to include routing address information extracted from the exception-based routing rules or range-based routing rules database; and

(e) transmitting the modified data packet into a second communications network based on the routing information.

34. The method of claim 33 wherein receiving a data packet from a first communications network includes receiving a Signaling System 7 (SS7) signaling message.

35. The method of claim 33 wherein receiving a data packet from a first communications network includes receiving an Interim Standard-41 (IS-41) protocol message.

36. The method of claim 33 wherein receiving a data packet from a first communications network includes receiving a Global System for Mobile Communications (GSM) Mobile Application Part (MAP) protocol message.

37. The method of claim 33 wherein receiving a data packet from a first communications network includes receiving a data packet from a Signaling System 7 (SS7) network.

38. The method of claim 33 wherein receiving a data packet from a first communications network includes receiving a data packet from an Internet Protocol (IP) network.

39. The method of claim 33 wherein receiving a data packet from a first communications network includes receiving a data packet from an Asynchronous Transfer Mode (ATM) network.

40. The method of claim 33 wherein performing the primary and secondary searches using the identification number in the data packet includes performing the primary and secondary searches using a mobile identification number in the data packet.

41. The method of claim 40 wherein performing the primary and secondary searches using a mobile identification number includes performing the primary and secondary searches using an International Mobile Subscriber Identity (IMSI) number in the data packet.

42. The method of claim 40 wherein performing the primary and secondary searches using a mobile identification number includes performing the primary and secondary searches using a Mobile Station Integrated Services Digital Network (MSISDN) number.

43. The method of claim 42 wherein performing the primary and secondary searches using a mobile identification number includes performing the primary and secondary searches using a Mobile Global Title number.

44. The method of claim 33 wherein modifying the data packet to include routing address information includes adding a network point code to the data packet.

45. The method of claim 44 wherein modifying the data packet to include routing address information includes adding a subsystem number to the data packet.

46. The method of claim 33 wherein modifying the data packet to include routing address information includes adding a network element entity address to the data packet.

47. The method of claim 33 wherein transmitting the modified data packet into a second communications network includes transmitting the modified data packet into a Signaling System 7 (SS7) network.

48. The method of claim 33 wherein transmitting the modified data packet into a second communications network includes transmitting the modified data packet over an Internet Protocol (IP).

49. The method of claim 33 wherein transmitting the modified data packet into a second network includes transmitting the modified data packet into an Asynchronous Transfer Mode (ATM) communications network.

50. The method of claim 33 comprising, after receiving the data packet, determining whether the data packet requires a routing address translation.

51. The method of claim 50 comprising, in response to determining that the data packet requires a routing address translation, determining a type of routing address translation required for the data packet.

52. The method of claim 51 wherein determining a type of routing address translation includes determining a type of Global System for Mobile Communications (GSM) or American National Standards Institute (ANSI)-41 network element to which the message is to be routed.

53. The method of claim 52 wherein determining a type of GSM or ANSI-41 network element includes determining whether to route the message to a Home Location Register (HLR).

54. The method of claim 52 wherein determining a type of GSM or ANSI-41 network element includes determining whether to route the message to an Equipment Identification Register (EIR).

55. The method of claim 52 wherein determining a type of GSM or ANSI-41 network element includes determining whether to route the message to an Authentication Center (AuC).

56. The method of claim 51 wherein determining a type of routing address translation includes determining whether to route the message to a Service Control Point (SCP).

57. The method of claim 50 wherein determining whether a data packet requires a routing address translation includes examining field values in a signaling connection control part (SCCP) called party address (CdPA) portion of the data packet.

58. The method of claim 57 wherein the examining fields in the SCCP CdPA portion of the data packet includes examining a Subsystem Number (SSN) field, a Translation Type. (TT) field, a Global Title Indicator (GTI) field, a numbering plan (NP) field, and a Nature of Address Indicator (NAI) field.

59. The method of claim 50 wherein determining whether a data packet requires a routing address translation includes examining field values in a Transaction Capabilities Application Part (TCAP) portion of the data packet.

60. A method for routing a signaling message in a communications network, the method comprising:

(a) receiving, at a first network element having a first point code, a signaling message transmitted from a Mobile Switching Center (MSC) having a second point code differing from the first point code, the signaling message having an origination point code (OPC) value being equal to the second point code and a destination point code (DPC) value equal to the first point code; and

(b) routing the signaling message to a second network element having a third point code differing from the first and second point codes, wherein routing the signaling message comprises changing the DPC value of the signaling message to the third point code and changing the OPC value of the signaling message to the first point code.

61. The method of claim 60 comprising:

(c) at the second network element, receiving the signaling message;

(d) changing at least one parameter associated with the signaling message to indicate that further translation is required;

(e) changing the OPC value of the message to the third point code and changing the DPC value of the message to the first point code; and

(f) transmitting the signaling message to the first network element.

62. The method of claim 61 comprising:

(g) at the first network element, receiving the signaling message;

(h) reading the at least one parameter that indicates that further translation is required;

(i) in response to determining that further translation is required, changing the DPC value of the signaling message to a fourth point code differing from the first, second, and third point codes and changing the OPC value of the signaling message to the first point code; and

(j) routing the signaling message to a third network element having the fourth point code.

63. The method of claim 62 wherein routing the signaling message to a third network element comprises routing the signaling message to a Global System for Mobile Communications (GSM) or American National Standards Institute (ANSI)-41 network element.

64. The method of claim 63 wherein routing the signaling message to a GSM or ANSI-41 network element comprises routing the signaling message to a Home Location Register (HLR).

65. The method of claim 63 wherein routing the signaling message to a GSM or ANSI-41 network element comprises routing the signaling message to an Authentication Center (AuC).

66. The method of claim 63 wherein routing the signaling message to a GSM or ANSI-41 network element comprises routing the signaling message to an Equipment Identification Register (EIR).

67. The method of claim 62 wherein routing the signaling message to a third network element comprises routing the signaling message to a Service Control Point (SCP).

68. The method of claim 62 comprising changing a called party address value of the signaling message to an entity address of the third network element.

69. The method of claim 62 wherein transmitting the signaling message to a third network element comprises transmitting a signaling system 7 (SS7) signaling message over an SS7 network.

70. The method of claim 60 wherein receiving a signaling message at a first network element comprises receiving a Signaling System 7 (SS7) signaling message over an SS7 network.

71. The method of claim 60 wherein receiving a signaling message at a first network element includes receiving the signaling message at a signal transfer point.

72. The method of claim 60 wherein transmitting the signaling message to a second network element comprises transmitting the signaling message to a routing node having a range-based database containing first packet routing rule records wherein each first packet routing rule record is indexed by a range or block of identification numbers and an exception-based database containing second packet routing rule records wherein each second packet routing rule record is indexed by a single identification number.

73. A method for routing a signaling message in a communications network, the method comprising:

(a) receiving, at a first network element having a first point code, a signaling message transmitted from a Gateway Mobile Switching Center (GMSC) having a second point code differing from the first point code, the signaling message having an origination point code (OPC) value being equal to the second point code, a destination point code (DPC) value equal to the first point code, and a first identification number; and

(b) routing the signaling message to a Home Location Register (HLR) having a third point code differing from the first and second point codes, wherein routing the signaling message comprises;

(i) performing a lookup in a first database for an entry corresponding to the first identification number, the first database comprising a plurality of entries, wherein each entry corresponds to a single identification number;

(ii) in response to locating an entry in the first database corresponding to the first identification number, extracting a point code value from the entry, the extracted point code being equal to the third point code, and changing the DPC value of the message to the third point code;

(iii) changing the OPC value of the message to the first point code; and

(iv) transmitting the signaling message to the HLR.

74. The method of claim 73 wherein receiving a signaling message from a GMSC comprises receiving a Signaling System 7 (SS7) signaling message over an SS7 network.

75. The method of claim 73 wherein transmitting the signaling message to the HLR comprises transmitting a Signaling System 7 (SS7) signaling message over an SS7 network.

76. The method of claim 73 comprising, in response to failing to locate an entry in the first database, performing a lookup in a second database, each entry in the second database corresponding to a plurality of identification numbers, and, in response to locating an entry corresponding to the first identification number in the second database extracting a point code value from the entry, the extracted point code value being equal to the third point code and changing the DPC value of the message to the third point code.