A method, operated in a Wideband Code Division Multiple Access, WCDMA, positioning node, for performing uplink positioning, comprising the steps of: receiving a request for uplink positioning of a user equipment; obtaining information about carrier capabilities for uplink positioning measurements for said user equipment; and deciding which carrier is to be used for uplink positioning measurements, based at least on said information about carrier capabilities, characterized by the further steps of: receiving data representing a respective load measure for a plurality of cells and carriers available for uplink positioning measurements of said user equipment, said load measures being determined, based on measurements of received total wideband power, in radio base stations possibly concerned by said uplink positioning of said user equipment, wherein said step of deciding which carrier is to be used for uplink positioning measurements being further based on said data representing said respective load measure for the plurality of cells and the carriers available for uplink positioning measurements of said user equipment; transmitting an uplink positioning measurement request for said user equipment using said carrier decided to be used for uplink positioning measurements; receiving data representing requested uplink positioning measurements; deducing said uplink positioning of said user equipment from said received data representing said requested uplink positioning measurements; and reporting said uplink positioning of said user equipment, wherein reporting said uplink positioning of said user equipment comprises reporting of said uplink positioning of said user equipment as a reference position for an adaptive enhanced cell identification, AECID, positioning method. receiving a request for uplink positioning of a user equipment; obtaining information about carrier capabilities for uplink positioning measurements for said user equipment; and deciding which carrier is to be used for uplink positioning measurements, based at least on said information about carrier capabilities, characterized by the further steps of: receiving data representing a respective load measure for a plurality of cells and carriers available for uplink positioning measurements of said user equipment, said load measures being determined, based on measurements of received total wideband power, in radio base stations possibly concerned by said uplink positioning of said user equipment, wherein said step of deciding which carrier is to be used for uplink positioning measurements being further based on said data representing said respective load measure for the plurality of cells and the carriers available for uplink positioning measurements of said user equipment; transmitting an uplink positioning measurement request for said user equipment using said carrier decided to be used for uplink positioning measurements; receiving data representing requested uplink positioning measurements; deducing said uplink positioning of said user equipment from said received data representing said requested uplink positioning measurements; and reporting said uplink positioning of said user equipment, wherein reporting said uplink positioning of said user equipment comprises reporting of said uplink positioning of said user equipment as a reference position for an adaptive enhanced cell identification, AECID, positioning method. receiving data representing a respective load measure for a plurality of cells and carriers available for uplink positioning measurements of said user equipment, said load measures being determined, based on measurements of received total wideband power, in radio base stations possibly concerned by said uplink positioning of said user equipment, wherein said step of deciding which carrier is to be used for uplink positioning measurements being further based on said data representing said respective load measure for the plurality of cells and the carriers available for uplink positioning measurements of said user equipment; transmitting an uplink positioning measurement request for said user equipment using said carrier decided to be used for uplink positioning measurements; receiving data representing requested uplink positioning measurements; deducing said uplink positioning of said user equipment from said received data representing said requested uplink positioning measurements; and reporting said uplink positioning of said user equipment, wherein reporting said uplink positioning of said user equipment comprises reporting of said uplink positioning of said user equipment as a reference position for an adaptive enhanced cell identification, AECID, positioning method.