Patent ID: 8693955

Claim:
A method for determining a location of a node, the method comprising the steps of: receiving a plurality of GSM network measurement reports; determining a call group from those network measurement reports having a same identification; determining signal-strength measurements from the plurality of GSM network measurement reports within the call group; determining a location from the signal-strength measurements, wherein the location comprises an (x,y) location: averaging a plurality of locations to produce an average location, ( x , y ) as: x _ = 1 N ⁢ ∑ i = 1 N ⁢ ⁢ x i ⁢ ⁢ y _ = 1 N ⁢ ∑ i = 1 N ⁢ ⁢ y i where x i is a x location calculated from an ith network measurement report, y i is a y location calculated from the ith network measurement report, and N is a number of network measurement reports within the call group; calculating ({circumflex over (x)} i ,ŷ i ) based on weighting the ( x , y ) location where x ^ i = w ⁢ x _ + ( 1 - w ) ⁢ x i ⁢ ⁢ and ⁢ ⁢ y ^ i = w ⁢ y _ + ( 1 - w ) ⁢ y i , ⁢ where w = exp ⁡ ( - n 2 c ) and where n=N/N max and the parameter c>0 and controls a rate of fall-off of w having a call-group size of N.