The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 29, 2011
Filed:
Nov. 09, 2007
Gary John Deval, Raleigh, NC (US);
Curtis E. Hrischuk, Holly Springs, NC (US);
Mark Johnson, Cincinnati, OH (US);
Craig Andrew Lanzen, Lambertville, MI (US);
James Winston Lawwill, Jr., Winchester, KY (US);
Timothy Paul Pickett, Rochester, MN (US);
Brian Pulito, Lexington, KY (US);
Gary John DeVal, Raleigh, NC (US);
Curtis E. Hrischuk, Holly Springs, NC (US);
Mark Johnson, Cincinnati, OH (US);
Craig Andrew Lanzen, Lambertville, MI (US);
James Winston Lawwill, Jr., Winchester, KY (US);
Timothy Paul Pickett, Rochester, MN (US);
Brian Pulito, Lexington, KY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method, system and computer program product for limiting extreme loads and reducing fluctuations in load at session servers. An admission rate controller of a SIP router calculates the 'deflator ratio' equal to the average number of in-dialog messages received over a first fixed interval of time divided by the average number of out-of-dialog messages received over a second fixed interval of time. Further, the admission rate controller calculates the 'dampening ratio' equal to the maximum number of messages allowed over a period of time divided by the number of messages admitted over a previous time interval. When an overload condition has been detected, the admission rate controller calculates the maximum number of out-of-dialog messages to be sent to its associated SIP server based on the deflator and dampening ratios. In this manner, a smoother transition from the overload condition to the non-overload condition may occur.