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:
Oct. 14, 1997
Filed:
Oct. 06, 1995
Takeo Hamada, Santa Clara, CA (US);
Takafumi Chujo, Kawasaki, JP;
Fujitsu Limited, Kanagawa, JP;
Abstract
A cell loss ratio calculating method is a method of calculating a cell loss ratio of a buffer for storing call cells from a plurality of traffic sources and comprises a distribution expressing step, a number-of-average-arrivals expressing step, an average path calculating step and a cell loss ratio calculating step. In the distribution expressing step, a distribution of the number of cells accumulated within a time for which the cell passes the buffer is expressed by use of a Poisson distribution on an assured side. In the number-of-average-arrivals expressing step, the number-of-cells distribution is expressed with parameters representing a number of average arrivals of the Poisson distribution. In average path calculating step, an average path is calculated with respect to time-variations of a cell arrival ratio and a distribution of the cell arrival ratio. In the cell loss ratio calculating step, the cell loss ratio of the buffer is calculated by using a result of the calculation in the average path calculating step as well as by using a table for storing a precalculated value of a number-of-lost-cells expected value corresponding to each number of average arrivals.