A method for a controlling node , the method comprising: determining (S102) a presence of at least one user equipment operating based on a configurable control channel monitoring; and controlling (S104) a bandwidth of a cell-specific reference signal, CRS, based on the determining the presence of the at least one user equipment operating based on the configurable control channel monitoring, the controlling the bandwidth of the CRS comprising: determining a first subset of time resources and a second subset of time resources; and using a first CRS bandwidth value for the first subset of time resources and a second CRS bandwidth value for the second set of time resources, the second subset being different from the first subset and the second CRS bandwidth value being different from the first CRS bandwidth value; and characterized in determining parameters at least partially characterizing the configurable control channel monitoring of the at least one user equipment , wherein the parameters at least partially characterizing the configurable control channel monitoring of the at least one user equipment include parameters G and r max , r max representing a maximum number of repetitions associated with a control channel and G representing an indicator used for indicating control channel resources, wherein the second CRS bandwidth value depends at least on the parameters G and r max . determining (S102) a presence of at least one user equipment operating based on a configurable control channel monitoring; and controlling (S104) a bandwidth of a cell-specific reference signal, CRS, based on the determining the presence of the at least one user equipment operating based on the configurable control channel monitoring, the controlling the bandwidth of the CRS comprising: determining a first subset of time resources and a second subset of time resources; and using a first CRS bandwidth value for the first subset of time resources and a second CRS bandwidth value for the second set of time resources, the second subset being different from the first subset and the second CRS bandwidth value being different from the first CRS bandwidth value; and characterized in determining parameters at least partially characterizing the configurable control channel monitoring of the at least one user equipment , wherein the parameters at least partially characterizing the configurable control channel monitoring of the at least one user equipment include parameters G and r max , r max representing a maximum number of repetitions associated with a control channel and G representing an indicator used for indicating control channel resources, determining a first subset of time resources and a second subset of time resources; and using a first CRS bandwidth value for the first subset of time resources and a second CRS bandwidth value for the second set of time resources, the second subset being different from the first subset and the second CRS bandwidth value being different from the first CRS bandwidth value; and characterized in determining parameters at least partially characterizing the configurable control channel monitoring of the at least one user equipment , wherein the parameters at least partially characterizing the configurable control channel monitoring of the at least one user equipment include parameters G and r max , r max representing a maximum number of repetitions associated with a control channel and G representing an indicator used for indicating control channel resources, wherein the second CRS bandwidth value depends at least on the parameters G and r max . <EOS>