Patent ID: 6684061
Filing Date: 2004-01-27
Classification: H04B

Abstract:
A method for measuring interference reciprocity between uplink and downlink directions in a wireless communications system, comprising:a) measuring correlation between uplink and downlink interference; b) determining if reciprocity is violated by falling outside a predetermined correlation range for the interference, wherein said reciprocity is determined by the equation: r1=&Sum;1&it;â€ƒ&it;(x1-x_)&it;(y1-y_){[&Sum;1&it;â€ƒ&it;(x1-x_)2]&af;[&Sum;1&it;(y1-y_)2]}1/2and wherein, the correlated data is assumed to occur in (x,y) pairs, where X1 may be the ith measurement of the UL interference and yi may be the ith measurement of the DL interference and the notations {overscore (x)} and {overscore (y)} represent the means values of x and y; wherein the summations cover all time periods and all channels within a given cell measured for a given determination; and c) identifying correlation status with regard to the range.