Patent ID: 8730925

Claim:
A method in a wireless terminal, the method comprising: identifying a positioning subframe that may contain a positioning reference signal (“PRS”) transmitted by a first base station based on information signaled from a serving base station, the positioning subframe comprising OFDM symbols over which a transmission corresponds to resource elements arranged on a subcarrier-OFDM symbol grid; determining whether the identified positioning subframe contains resource elements corresponding to the positioning reference signal based on information signaled from the serving base station; receiving the identified positioning subframe; estimating a time of arrival of the received positioning subframe based on the PRS contained in the received positioning subframe; and receiving the positioning reference signal on a first set of OFDM symbols where the positioning reference signal resource elements are obtained by taking Fast-Fourier Transform of a time-domain sequence obtained from a pseudo-random sequence generator; wherein initialization of the pseudo-random number generator is determined from any one of: a site identifier of the serving base station, a physical cell identity of the serving base station, a global cell identity of the serving base station, a system frame number, a subframe number, a resource element block index, a radio network transaction identity, and information signaled by the serving base station.