Managing bursts of traffic in such a manner as to improve the effective utilization of session servers

• US 7,808,894 B2
• Filed: 11/09/2007
• Issued: 10/05/2010
• Est. Priority Date: 11/09/2007
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Lanzen, Craig Andrew, Pulito, Brian, Lawwill, James Winston Jr., Johnson, Mark, DeVal, Gary John, Hrischuk, Curtis E., Pickett, Timothy Paul
• Primary Examiner(s): Yao; Kwang B
• Assistant Examiner(s): Liu; Jung
• Application Number:
  US11/937,748
• Publication Number:
  US 20090122705A1
• Time in Patent Office: 1,061 Days
• Field of Search: 370229-2362, 3702411-246, 370/369, 370/375, 370/376, 370/372, 370/394.5, 370/458, 370/459, 370/498, 370/395.2, 370/253
• US Class Current: 370/229
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/22 Traffic shaping
• CPC Class Codes: H04L 47/29 using a combination of thresholds

Abstract

A method, system and computer program product for managing bursts of traffic. A counter, referred to herein as a “frequency counter,” is incremented during those time intervals an overload condition is detected and is decremented during those time intervals an overload condition is not detected. An overload condition may refer to when the number of out-of-dialog messages exceeds a threshold value corresponding to the maximum number of out-of-dialog messages that should be accepted and forwarded to an associated session server. If the count of the frequency counter exceeds some pre-configured value, then traffic that exceeds the threshold for the overload condition is stopped from being sent to the associated session server. Otherwise, traffic that exceeds the threshold for the overload condition is permitted to be sent to the associated session server. By managing bursts of traffic in such a manner, the effective utilization of session servers is improved.

Claims

1. A method for managing bursts of traffic, the method comprising the steps of:

incrementing a counter by an admission rate controller for each time interval in an overload condition;

decrementing said counter by said admission rate controller for each time interval not in said overload condition; and

disabling a sending of a number of out-of-dialog messages that exceed a threshold indicating said overload condition to an associated session server in a next time interval if a count of said counter exceeds a second threshold, wherein said second threshold corresponds to a maximum number of time intervals to be in said overload condition.

2. The method as recited in claim 1 further comprising the step of:

permitting a sending of said number of out-of-dialog messages that exceed said threshold indicating said overload condition to said associated session server in said next time interval if said count of said counter does not exceed said second threshold.

3. The method as recited in claim 1 further comprising the step of:

incrementing said counter for each time interval in said overload condition unless said count of said counter exceeds a maximum number of counts.

4. The method as recited in claim 1 further comprising the step of:

decrementing said counter for each time interval not in said overload condition unless said count of said counter is equal to zero.

5. The method as recited in claim 1 further comprising the steps of:

receiving an out-of-dialog message during a time interval in said overload condition; and

rejecting said received message if a maximum number of out-of-dialog messages to be admitted has been reached.

6. The method as recited in claim 1 further comprising the steps of:

receiving an out-of-dialog message during a time interval in said overload condition; and

rejecting said received message if said sending of said number of out-of-dialog messages that exceed said threshold indicating said overload condition to said associated session server is disabled.

7. The method as recited in claim 1, wherein said associated session server corresponds to a server implementing Session Initiation Protocol.

8. The method as recited in claim 1, wherein said associated session server corresponds to a server implementing HyperText Transfer Protocol.

9. A system, comprising:

a memory unit for storing a computer program for managing bursts of traffic; and

a processor coupled to said memory unit, wherein said processor, responsive to said computer program, comprises;

circuitry for incrementing a counter for each time interval in an overload condition;

circuitry for decrementing said counter for each time interval not in said overload condition; and

circuitry for disabling a sending of a number of out-of-dialog messages that exceed a threshold indicating said overload condition to an associated session server in a next time interval if a count of said counter exceeds a second threshold, wherein said second threshold corresponds to a maximum number of time intervals to be in said overload condition.

10. The system as recited in claim 9, wherein said processor further comprises:

circuitry for permitting a sending of said number of out-of-dialog messages that exceed said threshold indicating said overload condition to said associated session server in said next time interval if said count of said counter does not exceed said second threshold.

11. The system as recited in claim 9, wherein said processor further comprises:

circuitry for incrementing said counter for each time interval in said overload condition unless said count of said counter exceeds a maximum number of counts.

12. The system as recited in claim 9, wherein said processor further comprises:

circuitry for decrementing said counter for each time interval not in said overload condition unless said count of said counter is equal to zero.

13. The system as recited in claim 9, wherein said processor further comprises:

circuitry for receiving an out-of-dialog message during a time interval in said overload condition; and

circuitry for rejecting said received message if a maximum number of out-of-dialog messages to be admitted has been reached.

14. The system as recited in claim 9, wherein said processor further comprises:

circuitry for receiving an out-of-dialog message during a time interval in said overload condition; and

circuitry for rejecting said received message if said sending of said number of out-of-dialog messages that exceed said threshold indicating said overload condition to said associated session server is disabled.

15. A computer program product embodied in a non-transitory computer readable medium for managing bursts of traffic, the computer program product, when executed by a processor, performs the programming steps of:

incrementing a counter for each time interval in an overload condition;

decrementing said counter for each time interval not in said overload condition; and

disabling a sending of a number of out-of-dialog messages that exceed a threshold indicating said overload condition to an associated session server in a next time interval if a count of said counter exceeds a second threshold, wherein said second threshold corresponds to a maximum number of time intervals to be in said overload condition.

16. The computer program product as recited in claim 15 further comprising the programming step of:

permitting a sending of said number of out-of-dialog messages that exceed said threshold indicating said overload condition to said associated session server in said next time interval if said count of said counter does not exceed said second threshold.

17. The computer program product as recited in claim 15 further comprising the programming step of:

incrementing said counter for each time interval in said overload condition unless said count of said counter exceeds a maximum number of counts.

18. The computer program product as recited in claim 15 further comprising the programming step of:

decrementing said counter for each time interval not in said overload condition unless said count of said counter is equal to zero.

19. The computer program product as recited in claim 15 further comprising the programming steps of:

receiving an out-of-dialog message during a time interval in said overload condition; and

rejecting said received message if a maximum number of out-of-dialog messages to be admitted has been reached.

20. The computer program product as recited in claim 15 further comprising the programming steps of:

receiving an out-of-dialog message during a time interval in said overload condition; and

rejecting said received message if said sending of said number of out-of-dialog messages that exceed said threshold indicating said overload condition to said associated session server is disabled.