Radio location by time advance for GSM systems had been published. But the resolution of time advance in GSM systems is too rough to locate the mobile position. This paper proposes a mobile location estimation based on the differences of downlink signal attenuations. This provides the possible mobile locations if the relationship between distances and signal attenuation is determined. Then, the mobile location can be estimated from those possible locations. The error of the proposed method is

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... ch smaller than the error of cell-ID method in the practical microcell system. The most advantage of this method is the non-necessity of a known and accurate path loss modeling and the reduction of shadowing effect.