A wireless device enabled to operate in a cellular communications network according to a carrier aggregation scheme using both a licensed frequency band and an unlicensed frequency band, comprising: a transceiver; at least one processor; and memory containing instructions executable by the at least one processor whereby the wireless device operates to: determine whether a Channel State Information Reference Symbol, CSI-RS, transmission from a License Assisted Secondary Cell, LA SCell, of the wireless device is present in a subframe, the LA SCell being in an unlicensed frequency band; process a CSI-RS measurement for the LA SCell for the subframe upon determining that a CSI-RS transmission from the LA SCell is present in the subframe; and refrain from processing a CSI-RS measurement for the LA SCell for the subframe upon determining that a CSI-RS transmission from the LA SCell is not present in the subframe; characterized in that, in order to determine whether a CSI-RS transmission from the LA SCell of the wireless device is present in the subframe, the wireless device further operates to determine whether the subframe is a discovery subframe for the LA SCell, wherein determining that the subframe is a discovery subframe for the LA SCell indicates that a CSI-RS transmission is present in the subframe. a transceiver; at least one processor; and memory containing instructions executable by the at least one processor whereby the wireless device operates to: determine whether a Channel State Information Reference Symbol, CSI-RS, transmission from a License Assisted Secondary Cell, LA SCell, of the wireless device is present in a subframe, the LA SCell being in an unlicensed frequency band; process a CSI-RS measurement for the LA SCell for the subframe upon determining that a CSI-RS transmission from the LA SCell is present in the subframe; and refrain from processing a CSI-RS measurement for the LA SCell for the subframe upon determining that a CSI-RS transmission from the LA SCell is not present in the subframe; characterized in that, in order to determine whether a CSI-RS transmission from the LA SCell of the wireless device is present in the subframe, the wireless device further operates to determine whether the subframe is a discovery subframe for the LA SCell, wherein determining that the subframe is a discovery subframe for the LA SCell indicates that a CSI-RS transmission is present in the subframe. determine whether a Channel State Information Reference Symbol, CSI-RS, transmission from a License Assisted Secondary Cell, LA SCell, of the wireless device is present in a subframe, the LA SCell being in an unlicensed frequency band; process a CSI-RS measurement for the LA SCell for the subframe upon determining that a CSI-RS transmission from the LA SCell is present in the subframe; and refrain from processing a CSI-RS measurement for the LA SCell for the subframe upon determining that a CSI-RS transmission from the LA SCell is not present in the subframe; characterized in that, in order to determine whether a CSI-RS transmission from the LA SCell of the wireless device is present in the subframe, the wireless device further operates to determine whether the subframe is a discovery subframe for the LA SCell, wherein determining that the subframe is a discovery subframe for the LA SCell indicates that a CSI-RS transmission is present in the subframe.