A method of performing positioning-related measurements using a wireless communication apparatus associated with a wireless communication network that includes one or more first cells, each of said one or more first cells transmitting cell-specific reference signals, CRSs, but not positioning reference signals, PRSs, and one or more second cells, each of said one or more second cells transmitting at least said PRSs, wherein said CRSs are transmitted to aid channel estimation while said PRSs are transmitted in defined positioning sub-frames explicitly for said positioning-related measurements, said method comprising the steps of: said wireless communication apparatus receiving a mix of reference signals, including one or more of said CRSs from one or more of said first cells, and one or more of said PRSs from one or more of said second cells, wherein said CRSs are transmitted without positioning-related measurement ambiguity from more than one antenna port at a time within any given cell in said one or more first cells, while said PRSs are transmitted without positioning-related measurement ambiguity from only one antenna port at a time within any given cell in said one or more second cells; said wireless communication apparatus further receiving PRS assistance data that explicitly or implicitly indicates that said one or more first cells do not transmit the PRSs, and wherein said PRS assistance data is transmitted in said one or more first cells even though said one or more first cells do not transmit any PRS, and further wherein said PRS assistance data identifies whether a given cell in the wireless communication network is one of said one or more first cells or one of said one or more second cells; upon receipt of said PRS assistance data, said wireless communication apparatus avoiding searching for a PRS in any cell in said one or more first cells and using said PRS assistance data to optimize said positioning-related measurements, to be made by the wireless communication apparatus, on each said CRS received from said one or more of said first cells; and said wireless communication apparatus performing said positioning-related measurements using said mix of reference signals including said one or more of said CRSs received from said one or more of said first cells and said one or more of said PRSs received from said one or more of said second cells, wherein the step of performing said positioning-related measurements comprises: said wireless communication apparatus reporting said positioning-related measurements on a per-antenna port basis. said wireless communication apparatus receiving a mix of reference signals, including one or more of said CRSs from one or more of said first cells, and one or more of said PRSs from one or more of said second cells, wherein said CRSs are transmitted without positioning-related measurement ambiguity from more than one antenna port at a time within any given cell in said one or more first cells, while said PRSs are transmitted without positioning-related measurement ambiguity from only one antenna port at a time within any given cell in said one or more second cells; said wireless communication apparatus further receiving PRS assistance data that explicitly or implicitly indicates that said one or more first cells do not transmit the PRSs, and wherein said PRS assistance data is transmitted in said one or more first cells even though said one or more first cells do not transmit any PRS, and further wherein said PRS assistance data identifies whether a given cell in the wireless communication network is one of said one or more first cells or one of said one or more second cells; upon receipt of said PRS assistance data, said wireless communication apparatus avoiding searching for a PRS in any cell in said one or more first cells and using said PRS assistance data to optimize said positioning-related measurements, to be made by the wireless communication apparatus, on each said CRS received from said one or more of said first cells; and said wireless communication apparatus performing said positioning-related measurements using said mix of reference signals including said one or more of said CRSs received from said one or more of said first cells and said one or more of said PRSs received from said one or more of said second cells, wherein the step of performing said positioning-related measurements comprises: said wireless communication apparatus reporting said positioning-related measurements on a per-antenna port basis.