Methods for estimation of csi reconstruction quality

A method performed by a wireless transmit/receive unit (WTRU), the method comprising:

• receiving configuration information, wherein the configuration information comprises a first reconstruction quality (RQ) function and a second RQ function;
• determining a channel state information (CSI) based on a plurality of reference signals (RSs);
• determining a first plurality of RQ indicators for the first RQ function based on the first RQ function;
• determining a second plurality of RQ indicators for the second RQ function based on the second RQ function;
• selecting the first plurality of RQ indicators or the second plurality of RQ indicators based on the CSI;
• determining encoder input indices for each RQ indicator of the selected plurality of RQ indicators;
• generating a compressed encoder input information-vector based on the determined encoder input indices, selected plurality of RQ indicators, and determined CSI;
• and
• sending the compressed encoder input vector and information relating to the selected plurality of RQ indicators.