A method in a node (110, 130,140,150), for estimating a position of a user equipment, wherein the node (110, 130, 140, 150) is configured to communicate with the user equipment in a wireless communication system, the method comprising: receiving a measurement from the user equipment, determining the need for at least one virtual reference measurement, wherein the virtual reference measurement comprises a simulated or extrapolated value related to a timing measurement, or a power-based measurement such as a received power measurement or a received quality measurement, obtaining the at least one virtual reference measurement, when it is determined to be needed, estimating the position of the user equipment, using the obtained at least one virtual reference measurement, determining the need for at least one virtual reference measurement comprises: calculating a correlation value, related to the correlation between the received measurement and a real reference measurement, computing a probability value, based on the calculated correlation value, which probability value indicates probability that the user equipment is situated in a physical location associated with the real reference measurement, comparing the computed probability value with a second threshold value, and determining to estimate the position of the user equipment using the virtual reference measurement, when the computed probability value does not exceed the second threshold value. receiving a measurement from the user equipment, determining the need for at least one virtual reference measurement, wherein the virtual reference measurement comprises a simulated or extrapolated value related to a timing measurement, or a power-based measurement such as a received power measurement or a received quality measurement, obtaining the at least one virtual reference measurement, when it is determined to be needed, estimating the position of the user equipment, using the obtained at least one virtual reference measurement, determining the need for at least one virtual reference measurement comprises: calculating a correlation value, related to the correlation between the received measurement and a real reference measurement, computing a probability value, based on the calculated correlation value, which probability value indicates probability that the user equipment is situated in a physical location associated with the real reference measurement, comparing the computed probability value with a second threshold value, and determining to estimate the position of the user equipment using the virtual reference measurement, when the computed probability value does not exceed the second threshold value. calculating a correlation value, related to the correlation between the received measurement and a real reference measurement, computing a probability value, based on the calculated correlation value, which probability value indicates probability that the user equipment is situated in a physical location associated with the real reference measurement, comparing the computed probability value with a second threshold value, and determining to estimate the position of the user equipment using the virtual reference measurement, when the computed probability value does not exceed the second threshold value.