A method performed by a wireless communications device for positioning of the wireless communications device in a wireless communications network, wherein the wireless communications network comprises a serving cell (320, 330, 340) and neighbour cells (320, 330, 340), the method comprising: obtaining (404, 503), from a network node, selection strategy information, SSI, related to a cell selection process for selecting a reference cell (320, 330, 340), which reference cell is to be used for computing a position of the wireless communications device, the SSI indicating a mechanism for selecting the reference cell, the reference cell being one out of the serving cell and the neighbour cells; measuring (401, 405, 501, 504) a Time Of Arrival, TOA, of a signal associated with the serving cell (320, 330, 340) and a TOA of a neighbouring cell; selecting (406, 505) the reference cell (320, 330, 340) to be used for computing the position of the wireless communications device based on the SSI, wherein the SSI indicates to the wireless communication device to select as reference cell (320, 330, 340) that cell (320, 330, 340) that corresponds to a minimum TOA in combination with at least one of that it corresponds to a minimum estimated TOA error, a minimum delay spread, a previously selected reference cell and a line of sight condition; computing (407, 506) a difference of the measured TOAs from the TOA of the reference cell based on the selection of the reference cell (320, 330, 340), wherein the difference of the measured TOAs is a Reference signal Time difference, RSTD; and providing (408, 507) the computed difference of the TOAs to the network node for the network node to compute the position of the wireless communications device based on the computed difference of the TOAs. obtaining (404, 503), from a network node, selection strategy information, SSI, related to a cell selection process for selecting a reference cell (320, 330, 340), which reference cell is to be used for computing a position of the wireless communications device, the SSI indicating a mechanism for selecting the reference cell, the reference cell being one out of the serving cell and the neighbour cells; measuring (401, 405, 501, 504) a Time Of Arrival, TOA, of a signal associated with the serving cell (320, 330, 340) and a TOA of a neighbouring cell; selecting (406, 505) the reference cell (320, 330, 340) to be used for computing the position of the wireless communications device based on the SSI, wherein the SSI indicates to the wireless communication device to select as reference cell (320, 330, 340) that cell (320, 330, 340) that corresponds to a minimum TOA in combination with at least one of that it corresponds to a minimum estimated TOA error, a minimum delay spread, a previously selected reference cell and a line of sight condition; computing (407, 506) a difference of the measured TOAs from the TOA of the reference cell based on the selection of the reference cell (320, 330, 340), wherein the difference of the measured TOAs is a Reference signal Time difference, RSTD; and providing (408, 507) the computed difference of the TOAs to the network node for the network node to compute the position of the wireless communications device based on the computed difference of the TOAs.