Patent ID: 8260210

Claim:
A method to determine the existence of interferences in a wireless communication link based on comparing the power received at both links of radio channel and the propagation losses calculated from both power and quality measurements, the method comprising the following steps: (i) a first step of gathering, for each established connection, the values RXLEV_UL and RXLEV_DL; (ii) a second step of using independently the values RXLEV_UL and RXLEV_DL to estimate the receiver power level in the base station and, therefore, obtaining two different estimations for the uplink received power per user, wherein said two different estimations are denoted as: P RXLEV — UL i which is the estimation of the received power strength in the UL that is obtained solely from the measurements of the UL received signal strength; and {tilde over (P)} UL i it which is the estimation of the received power strength in the DL updated with the difference in the transmitted power between UL and DL that is obtained only from the measurements of the DL received signal strength; (iii) a third step of statistical analysis of the two different estimations obtained in the second step (P RXLEV — UL i and {tilde over (P)} UL i ) for every connection i in the radio link; (iv) a fourth step of comparing the estimations (P RXLEV — UL i and {tilde over (P)} UL i ) of the uplink received signals strength made at the second step with the quality parameters RXQUAL_UL and RXQUAL_DL; (v) a fifth step of computing the behaviour of the values p s i and R snri computed in the fourth step, said values being defined as: p s i which is the sequence of the estimation of the standard deviation of the estimations of the received power levels in the UL per connection, and represents the difference between the two estimations respect to the average value; and R snri which is the comparison ratio between the signal noise interference ratio for uplink and downlink; (vi) a sixth step of analyzing the results of the fifth step configured to detect, at least, the following points: (a) steady-state abnormalities if the power versus quality points gather around a point with a high standard deviation, or a point with different qualities; (b) unbalanced interferences, wherein the distributions of the points in the high standard deviation versus R snri representation explain the presence of unbalanced interferences; (c) malfunctioning of the power control: a large concentration of points out of the line R snri =1 also may be a result of a poor performance of the power control method; and (d) inadequate radio planning: a recurrent unbalanced and time variant interference caused by other radio links within the same system.