A method of indicating a Channel State Information, CSI, feedback, comprising: a base station configuring a User Equipment, UE, with a CSI feedback scheme; and the base station transmitting the configured CSI feedback scheme to the UE in configuration signaling to indicate the CSI feedback scheme to be adopted by the UE in aperiodic CSI reporting, wherein the base station configuring the UE with the CSI feedback scheme further comprises: the base station configuring the UE with the corresponding CSI feedback scheme dependent upon a carrier configuration condition of the UE, wherein the carrier configuration condition of the UE comprises that the UE is configured symmetrically with UL CCs and DL CCs and that the UE is configured asymmetrically with UL CCs and DL CCs, wherein the CSI feedback scheme configured for the UE by the base station comprises a joint feedback scheme in case of asymmetric configuration and a second independent feedback scheme in case of symmetric configuration and the joint feedback scheme is to put CSI of all the activated Downlink Component Carriers, DL CCs, of the UE over a Physical Uplink Shared Channel, PUSCH, scheduled by an Uplink Grant, UL grant, for feedback; and the second independent feedback scheme is to put CSI, of a DL CC having a system-level paired linking relationship with an Uplink Component Carriers, UL CC, scheduled by a UL grant, over a PUSCH scheduled by the UL grant for feedback. a base station configuring a User Equipment, UE, with a CSI feedback scheme; and the base station transmitting the configured CSI feedback scheme to the UE in configuration signaling to indicate the CSI feedback scheme to be adopted by the UE in aperiodic CSI reporting, wherein the base station configuring the UE with the CSI feedback scheme further comprises: the base station configuring the UE with the corresponding CSI feedback scheme dependent upon a carrier configuration condition of the UE, wherein the carrier configuration condition of the UE comprises that the UE is configured symmetrically with UL CCs and DL CCs and that the UE is configured asymmetrically with UL CCs and DL CCs, wherein the CSI feedback scheme configured for the UE by the base station comprises a joint feedback scheme in case of asymmetric configuration and a second independent feedback scheme in case of symmetric configuration and the joint feedback scheme is to put CSI of all the activated Downlink Component Carriers, DL CCs, of the UE over a Physical Uplink Shared Channel, PUSCH, scheduled by an Uplink Grant, UL grant, for feedback; and the second independent feedback scheme is to put CSI, of a DL CC having a system-level paired linking relationship with an Uplink Component Carriers, UL CC, scheduled by a UL grant, over a PUSCH scheduled by the UL grant for feedback. the base station configuring the UE with the corresponding CSI feedback scheme dependent upon a carrier configuration condition of the UE, wherein the carrier configuration condition of the UE comprises that the UE is configured symmetrically with UL CCs and DL CCs and that the UE is configured asymmetrically with UL CCs and DL CCs, wherein the CSI feedback scheme configured for the UE by the base station comprises a joint feedback scheme in case of asymmetric configuration and a second independent feedback scheme in case of symmetric configuration and the joint feedback scheme is to put CSI of all the activated Downlink Component Carriers, DL CCs, of the UE over a Physical Uplink Shared Channel, PUSCH, scheduled by an Uplink Grant, UL grant, for feedback; and the second independent feedback scheme is to put CSI, of a DL CC having a system-level paired linking relationship with an Uplink Component Carriers, UL CC, scheduled by a UL grant, over a PUSCH scheduled by the UL grant for feedback.