Service and information management system for a telecommunications network

• US 5,555,295 A
• Filed: 05/16/1995
• Issued: 09/10/1996
• Est. Priority Date: 05/16/1995
• Status: Expired due to Fees

• Current Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Original Assignee: AT&T Corporation (AT&T, Inc.)
• Inventors: Bhusri, Gurcharan S.
• Primary Examiner(s): Chin, Stephen
• Assistant Examiner(s): Shankar, Vijay
• Application Number:
  US08/442,526
• Time in Patent Office: 483 Days
• Field of Search: 379/10, 379/11, 379/13, 379/36, 379/92, 379/111-115, 379/133, 379/134
• US Class Current: 379/112.09
• CPC Class Codes: H04M 3/36 Statistical metering, e.g. recording occasions when traffic exceeds capacity of trunks
• CPC Class Codes: H04Q 2213/13092 Scanning of subscriber lines, monitoring
• CPC Class Codes: H04Q 2213/1316 Service observation, testing
• CPC Class Codes: H04Q 2213/13166 Fault prevention
• CPC Class Codes: H04Q 2213/13176 Common channel signaling, CCS7
• CPC Class Codes: H04Q 2213/13349 Network management
• CPC Class Codes: H04Q 2213/1336 Synchronisation
• CPC Class Codes: H04Q 2213/13514 quality of service - inc. grade of service
• CPC Class Codes: H04Q 2213/13545 monitoring of signaling messages, intelligent network
• CPC Class Codes: H04Q 3/0062 Provisions for network management

Abstract

A system for service control and operations for a telecommunications network. In particular, an architecture and method for a service control and operations element system. The system communicates with a plurality of interconnected telecommunications network elements via a switching and signaling subsystem. The system provides and controls the functions of the telecommunications network, including a method of measuring delay between the time a customer dials a phone number of a called party and the time the customer hears a ringback tone indicating that the called party was alerted to the call, a method of synchronizing clocks located at individual network elements with a centralized time source, and a method of time-of-day clock surveillance.

Claims

1. A method of measuring an amount of time which elapses between a calling party dialing a phone number of a called party and the calling party hearing a ringback tone indicating that the called party has been alerted to a telephone call, comprising:

transmitting from a first telecommunications element in the geographic area of the calling party to an originating network element in the geographic area of the calling party a first message indicating that the phone number of the called party was dialed by the calling party;

copying the first message;

appending transaction information to the copied first message having a time stamp indicating when the first message was received by the originating network element, so that the appended information and the copied first message form a first information packet;

forwarding the first information packet from the originating network element to a communications unit;

transmitting to the originating network element a second message indicating that the called party was alerted to the call;

copying the second message;

appending transaction information to the copied second message having a time stamp indicating when the second message was received by the originating network element, so that the appended information and the copied second message form a second information packet;

forwarding the second information packet from the originating network element to the communications unit; and

subtracting the value of the time stamp in the first information packet from the value of the time stamp in the second information packet to obtain a first component of delay.

2. The method according to claim 1, further comprising:

appending a prefix to the telephone number associated with the called party so that the communications unit becomes a called party, the communications unit providing for answering and release of the call;

redialing the prefixed telephone number, a test call initiated and answered by the communications unit thereby being placed;

calculating a second component of delay associated with transmitting the first message from the first telecommunications element to the originating network element and transmitting the second message from the originating network element to the first telecommunications element; and

adding the first and second components of delay together to obtain the total time elapsed until the calling party hears a ringback tone indicating that the called party has been alerted to the telephone call placed by the calling party.

3. The method according to claim 2, further comprising:

adding to the total time elapsed a time it takes for the first telecommunications element and the originating network element to process and transmit messages.

4. The method according to claim 3, further comprising:

adjusting the total time elapsed to account for differences in message propagation time resulting from a distance between the originating network element and the first telecommunications element being different than a distance between the communications unit and the originating network element.

5. The method according to claim 4, further comprising:

adding to the adjusted total time elapsed an amount of time it takes the call to travel from the first telecommunications element to the calling party'"'"'s phone and back to the first telecommunications element; and

adding to the adjusted total time elapsed an amount of time it takes the call to travel from a second telecommunications element in the geographic area of the called party to the called party'"'"'s phone.

6. A method of measuring time elapsed until a calling party hears a ringback tone indicating that a called party has been alerted to a telephone call placed by the calling party, comprising:

transmitting from a first telecommunications element in the geographic area of the calling party to a first originating network element in the geographic area of the calling party a first message indicating that a telephone number in the geographic area of the called party was dialed;

copying the first message;

appending transaction information to the copied first message having a time stamp indicating when the first message was received by the first originating network element, so that the appended information and the copied first message form a first information packet;

forwarding the first information packet from the first originating network element to a communications unit;

transmitting to the first originating network element a second message indicating that the called party was alerted to the telephone call;

copying the second message;

appending transaction information to the copied second message having a time stamp indicating when the second message was received by the first originating network element, so that the information and the copied second message form a second information packet;

forwarding the second information packet from the first originating network element to the communications unit;

subtracting the value of the time stamp in the first information packet from the value of the time stamp in the second information packet to obtain a first component of delay;

transmitting from a second telecommunications element in the geographic area of the called party to a second originating network element in the geographic area of the called party a third message indicating that a telephone number in the geographic area of the calling party was dialed;

copying the third message;

appending transaction information to the copied third message having a time stamp indicating when the third message was received by the second originating network element, so that the appended information and the copied third message form a third information packet;

forwarding the third information packet from the second originating network element to the communications unit;

transmitting to the second originating network element a fourth message indicating that the called party was alerted to the telephone call;

copying the fourth message;

appending transaction information to the copied fourth message having a time stamp indicating when the fourth message was received by the second originating network element, so that the appended information and the copied fourth message form a fourth information packet;

forwarding the fourth information packet from the second originating network element to the communications unit;

subtracting the value of the time stamp in the third information packet from the value of the time stamp in the fourth information packet to obtain a second component of delay;

adding the first component of delay to the second component of delay to obtain a double value of delay; and

subtracting from the double value of delay the time it takes a message to travel from the first originating network element to the second originating network element and back to the first originating network element to obtain the total time elapsed until a calling party hears a ringback tone indicating that a called party has been alerted to a telephone call placed by the calling party.

7. The method according to claim 6, further comprising:

adjusting the total time elapsed to account for the differences in processing time of different types of messages at the first and second telecommunications elements.

8. The method according to claim 7, further comprising:

adding to the adjusted total time elapsed an amount of time it takes the call to travel from the first telecommunications element to the calling party'"'"'s phone; and

adding to the adjusted total time elapsed an amount of time it takes the call to travel from the second telecommunications element to the called party'"'"'s phone.