Firstly

we introduce the format of the propagation models for different 3G planning tools

and the relation between the standard model in Aircom Asset3G and the classical propagation model

such as COST 231- Hata

is provided to show the source of models in planning tools. Then the relations of the coefficients of the propagation models for 3G planning tools are analyzed. With these relations

the values of calibrated coefficients of the propagation model are improved. Finally

an example is provided.