measuring, at the mobile device, received signal power of a first set of signals received from a plurality of cells and storing corresponding received signal power measurements;

measuring, at the mobile device, a plurality of times of arrival of a second set of signals received from the plurality of cells;

determining, at the mobile device, a plurality of time difference of arrival (TDOA) measurements from the plurality of times of arrival; and

generating, using a power-time hybrid Gaussian maximum likelihood estimator and positioning assistance data for the plurality of cells, a maximum likelihood estimate of the position of the mobile device by evaluating a joint conditional probability of the received signal power measurements and the plurality of TDOA measurements, where the received signal power measurements are represented by a first Gaussian random variable and the plurality of TDOA measurements are represented by a second Gaussian random variable.