Dynamic cell mode indication and reporting channel state information for dormant cells in a dual connectivity carrier aggregation environment. UEs may be configured for carrier aggregation of cells associated with non-collocated eNBs, which may include a master eNB (MeNB) and one or more secondary eNBs (SeNB), each supporting multiple carrier frequencies. Indicators of cell mode for secondary cells of the MeNB or SeNB are periodically sent using a broadcast mechanism and may configure active or dormant sub-periods within the indicated periods. The indicators may be transmitted by a primary cell for the MeNB or special secondary cell for the SeNB. Alternatively, the indicators may be transmitted by the secondary cell. When CSI measurements occur for a dormant cell, the UE may report CSI for the dormant periods, suppress CSI reporting for the dormant periods, or report some types of CSI and not others for the dormant periods.