Patent ID: 8514131

Claim:
A method of improving the reliability of a position estimate of a mobile wireless device, comprising: receiving a set of fingerprint prediction maps and corresponding metrics, said fingerprint prediction maps including at least a first prediction map and a second prediction map, said metrics including a first metric corresponding to the first fingerprint prediction map indicating a probability that the first prediction map is currently valid and a second metric corresponding to the second fingerprint prediction map indicating a probability that the second prediction map is currently valid, said first and second fingerprint prediction maps corresponding to the same area but different sets of conditions; making, in the mobile wireless device, a sensor reading; updating said metrics including the first metric and the second metric based on a known current condition, said known current condition being an environmental condition; selecting a fingerprint prediction map in said set of fingerprint prediction maps having a highest probability of being valid as indicated by the updated metrics; determining, using the selected fingerprint map, a position of the mobile wireless device based on said sensor reading; and updating at least one of the first or second metrics based on the result of said position determination.