A method of reference signal transmissions by a wireless communication network base station in a wireless communication network , wherein said method comprises the steps of: transmitting , in a cell associated with said wireless communication network base station , cell-specific reference signals, CRSs, from any one or more of antenna ports in a plurality of antenna ports used for transmitting in said cell ; transmitting , in said cell , positioning reference signals, PRSs, from only one of said antenna ports at a time according to a port configuration that determines which one of the antenna ports is selected for use in transmitting the PRSs at any given one of the transmission occasions that are defined for transmission of the PRSs, wherein said CRSs are transmitted to aid channel estimation while said PRSs are transmitted in defined positioning subframes explicitly for positioning-related measurements; receiving signaling indicating at least one PRS muting pattern configured to indicate, for each of said transmission occasions, whether PRS is muted in a respective transmission occasion, wherein each said at least one PRS muting pattern is a function of a cell ID of the cell associated with the wireless communication network base station and one antenna port of said antenna ports being selected for use in transmitting the PRSs; dynamically changing which one of said antenna ports in said cell is selected for said use in transmitting the PRSs at any given one of the transmission occasions, based on said at least one PRS muting pattern; and controlling transmission of the CRSs in said cell so as not to coincide with symbol times in any of said transmission occasions that are used for transmitting symbols comprising the PRSs. transmitting , in a cell associated with said wireless communication network base station , cell-specific reference signals, CRSs, from any one or more of antenna ports in a plurality of antenna ports used for transmitting in said cell ; transmitting , in said cell , positioning reference signals, PRSs, from only one of said antenna ports at a time according to a port configuration that determines which one of the antenna ports is selected for use in transmitting the PRSs at any given one of the transmission occasions that are defined for transmission of the PRSs, wherein said CRSs are transmitted to aid channel estimation while said PRSs are transmitted in defined positioning subframes explicitly for positioning-related measurements; receiving signaling indicating at least one PRS muting pattern configured to indicate, for each of said transmission occasions, whether PRS is muted in a respective transmission occasion, wherein each said at least one PRS muting pattern is a function of a cell ID of the cell associated with the wireless communication network base station and one antenna port of said antenna ports being selected for use in transmitting the PRSs; dynamically changing which one of said antenna ports in said cell is selected for said use in transmitting the PRSs at any given one of the transmission occasions, based on said at least one PRS muting pattern; and controlling transmission of the CRSs in said cell so as not to coincide with symbol times in any of said transmission occasions that are used for transmitting symbols comprising the PRSs. <EOS>