Patent ID: 6393102
Filing Date: 2002-05-21
Classification: G01R,H04L,H04M

Abstract:
A method executed in a computer system for diagnosing, and predicting trouble causes in a process involving realizations of performance of a telephone connection, wherein the ith realization has ni steps and the performance is a function of a c-component vector of characteristics, said performance and c-component vector having a value of &thgr;i[j, xi(j)] and xi(j), respectively at the jth step of the ith realization, comprisinga) expressing an overall performance, &psgr;i, as a function, &phgr;i, of the performance at each of the ni steps, &psgr;i=&phgr;i{&thgr;i[1, xi(1)], &thgr;i[2, xi(2)], . . . ,&thgr;i[ni, xi(ni)]}; b) choosing a function, f, of a d-component vector of parameters, &bgr;, and the c-component vector of characteristics with which to approximate the performances, &thgr;i[j, xi(j)]&ap;f[&bgr;, xi(j)], such that the overall performance, &psgr;i, can be written as a function, &ggr;i, of the d-component vector of parameters and r c-component vectors, si,1, si,2, . . . , and si,r, that depend on the ni characteristic vectors xi(1), xi(2), . . . , and xi(ni), Ïˆi=â€ƒ&it;Ï†i&it;{f&af;[Î²,xi&af;(1)],f&af;[Î²,xi&af;(2)],â€¦&it;â€ƒ,f&af;[Î²,xi&af;(ni)]}&Congruent;â€ƒ&it;Î³i&it;{Î²,si,1&af;[xi&af;(1),xi&af;(2),â€¦&it;â€ƒ,xi&af;(ni)],â€ƒ&it;si,2&af;[xi&af;(1),xi&af;(2),â€¦&it;â€ƒ,xi&af;(ni)],â€¦&it;â€ƒ,â€ƒ&it;si,r&af;[xi&af;(1),xi&af;(2),â€¦&it;â€ƒ,xi&af;(ni)]}where ri; andc) finding a best vector of parameters that results in a best fit of the function &ggr;i(&bgr;, si,1, si,2, . . . , si,r) to data points corresponding to the overall performance as a function of the r c-component vectors, si,1, si,2, . . . , and si,r.