Patent ID: 7233800

Claim:
A method of operating a wireless communications device to perform a location determination operation, the method comprising: receiving first, second and third signals from first, second and third base stations, respectively, said first and second signals corresponding to first and second carrier frequencies, respectively, said first and second carrier frequencies being different; and determining at least two channel gain ratios, said at least two channel gain ratios including a first channel gain ratio and a second channel gain ratio, the first channel gain ratio being a ratio of a first channel gain to a second channel gain, the first channel gain being a channel gain between said first base station and said wireless communications device, the second channel gain being a channel gain between said second base station and said wireless communications device; and determining a geographic area which corresponds to said at least two determined channel gain ratios; wherein determining at least two channel gain ratios includes using information indicative of the relative transmission power of the first, second, and third signals transmitted by said first, second, and third base stations, respectively; and wherein the relative transmission power between said first and second base stations and ii) said second and third base stations is predetermined, said step of determining at least two channel gain ratios including accessing stored information indicating the power relationship.