A communications system comprising - a wireless transmit/receive unit, WTRU, configured to transmit a channel state information, CSI, report; and - a base station configured to transmit an aperiodic CSI reporting request for the WTRU to transmit the CSI report, wherein the WTRU comprises: a receiver configured to receive the aperiodic CSI reporting request on a physical downlink control channel, PDCCH, in a slot containing multiple symbols; circuitry configured to determine a time gap between a last symbol of the PDCCH of which the aperiodic CSI reporting request is received and a first uplink symbol of an uplink channel for transmission of a corresponding CSI report, wherein the determination of the time gap includes consideration of a timing advance value; the circuitry configured to determine a CSI processing time threshold based on subcarrier spacing used by the WTRU for communication with the base station , wherein the CSI processing time threshold is a function of a type of CSI to be reported and the subcarrier spacing, and determine whether the determined time gap is shorter than the determined CSI processing time threshold; and a transmitter configured: to transmit, on a condition that the determined time gap is not shorter than the determined CSI processing time threshold, the CSI report to the base station , in response to the CSI reporting request, not to transmit, on a condition that the determined time gap is shorter than the determined CSI processing time threshold, the CSI report. - a wireless transmit/receive unit, WTRU, configured to transmit a channel state information, CSI, report; and - a base station configured to transmit an aperiodic CSI reporting request for the WTRU to transmit the CSI report, a receiver configured to receive the aperiodic CSI reporting request on a physical downlink control channel, PDCCH, in a slot containing multiple symbols; circuitry configured to determine a time gap between a last symbol of the PDCCH of which the aperiodic CSI reporting request is received and a first uplink symbol of an uplink channel for transmission of a corresponding CSI report, wherein the determination of the time gap includes consideration of a timing advance value; the circuitry configured to determine a CSI processing time threshold based on subcarrier spacing used by the WTRU for communication with the base station , wherein the CSI processing time threshold is a function of a type of CSI to be reported and the subcarrier spacing, and determine whether the determined time gap is shorter than the determined CSI processing time threshold; and a transmitter configured: to transmit, on a condition that the determined time gap is not shorter than the determined CSI processing time threshold, the CSI report to the base station , in response to the CSI reporting request, not to transmit, on a condition that the determined time gap is shorter than the determined CSI processing time threshold, the CSI report. to transmit, on a condition that the determined time gap is not shorter than the determined CSI processing time threshold, the CSI report to the base station , in response to the CSI reporting request, not to transmit, on a condition that the determined time gap is shorter than the determined CSI processing time threshold, the CSI report. <EOS>