A method for use in a mobile device , the method comprising, at the mobile device: acquiring a first positioning signal (144-3) transmitted at a first frequency and a second positioning signal (144-4) transmitted at a second frequency that is different than the first frequency; performing a measurement of a time difference of arrival between the first positioning signal and the second positioning signal; determining an inter-frequency bias compensation, at the mobile device, for the measurement, characterized in determining the inter-frequency bias compensation comprises performing an iterative procedure that provides a position of the mobile device and the inter-frequency bias compensation, wherein the iterative procedure is performed by estimating an initial estimate based at least on the Cell-ID location of the mobile device and then iteratively estimating at least one new estimate based on at least the initial estimate until the change in the estimated position is approximately zero, wherein the at least one new estimate includes the determined inter-frequency bias compensation; applying the inter-frequency bias compensation to the measurement to generate a compensated measurement, the inter-frequency bias compensation to reduce inter-frequency related delays corresponding to the first frequency, the second frequency, or both the first frequency and the second frequency; and sending the compensated measurement and a measurement description to a location server , wherein the measurement description indicates that the compensated measurement has been compensated, at the mobile device, for the inter-frequency related delays. acquiring a first positioning signal (144-3) transmitted at a first frequency and a second positioning signal (144-4) transmitted at a second frequency that is different than the first frequency; performing a measurement of a time difference of arrival between the first positioning signal and the second positioning signal; determining an inter-frequency bias compensation, at the mobile device, for the measurement, characterized in determining the inter-frequency bias compensation comprises performing an iterative procedure that provides a position of the mobile device and the inter-frequency bias compensation, wherein the iterative procedure is performed by estimating an initial estimate based at least on the Cell-ID location of the mobile device and then iteratively estimating at least one new estimate based on at least the initial estimate until the change in the estimated position is approximately zero, wherein the at least one new estimate includes the determined inter-frequency bias compensation; applying the inter-frequency bias compensation to the measurement to generate a compensated measurement, the inter-frequency bias compensation to reduce inter-frequency related delays corresponding to the first frequency, the second frequency, or both the first frequency and the second frequency; and sending the compensated measurement and a measurement description to a location server , wherein the measurement description indicates that the compensated measurement has been compensated, at the mobile device, for the inter-frequency related delays. <EOS>