Patent ID: 8737245
Filing Date: 2014-05-27
Classification: H04B,H04W

Abstract:
1. Method for measuring link cost metrics and evaluating their accuracy with respect to reference measure of link quality in a communication network, said method comprising: during a given time interval, simultaneously transmitting several types of probe packets and data traffic, and estimating a plurality of link cost metrics (metricA, metricB, . . . , metricN) and a reference measure of link quality for a set of communication links; evaluating the accuracy of the estimated link cost metrics (metricA, metricB, . . . , metricN) by computing their correlation with the reference measure of link quality; and collecting cross-layer information for each probe packet, wherein a squared correlation coefficient is used to quantify and summarize the ability of each cost metric to track link capacity variations across time and across several links in the communication network, wherein each link cost metric or a function of it is connected to the reference measure of link quality or a function of it using linear regression, wherein each link cost metric is expressed as M=a+bC, where C is the reference measure of link quality, and a and b are real numbers determined using linear regression, and wherein, based on the samples of M and C, the squared correlation coefficient is computed as where cov(M,C), var(M) and var(C) denote covariance, and sample variance of M and C, respectively.