A method, comprising: in a user equipment, receiving information indicating multiple sets of reference signal patterns from a transmission point (12, 130, 130-1, 130-2, 130-3, 130-4) for channel quality measurement for the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4), wherein the multiple sets of reference signal patterns comprise one or more muting reference signal patterns that signals which reference signal patterns are selected from the multiple sets of reference signal patterns for reporting the channel quality measurement to the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4), and the one or more muting reference signal patterns have zero transmit power for certain frames of transmissions by the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4); measuring the channel quality for the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4) over the selected reference signal patterns of the indicated multiple sets of reference signal patterns for the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4) based on the one or more muting reference signal patterns from the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4); and reporting to the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4) indications of the measured channel quality only over the selected reference signal patterns for the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4). in a user equipment, receiving information indicating multiple sets of reference signal patterns from a transmission point (12, 130, 130-1, 130-2, 130-3, 130-4) for channel quality measurement for the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4), wherein the multiple sets of reference signal patterns comprise one or more muting reference signal patterns that signals which reference signal patterns are selected from the multiple sets of reference signal patterns for reporting the channel quality measurement to the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4), and the one or more muting reference signal patterns have zero transmit power for certain frames of transmissions by the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4); the multiple sets of reference signal patterns comprise one or more muting reference signal patterns that signals which reference signal patterns are selected from the multiple sets of reference signal patterns for reporting the channel quality measurement to the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4), and the one or more muting reference signal patterns have zero transmit power for certain frames of transmissions by the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4); measuring the channel quality for the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4) over the selected reference signal patterns of the indicated multiple sets of reference signal patterns for the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4) based on the one or more muting reference signal patterns from the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4); and reporting to the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4) indications of the measured channel quality only over the selected reference signal patterns for the transmission point (12, 130, 130-1, 130-2, 130-3, 130-4).