Channel state information (CSI) reporting for new radio (NR) side-links

A user equipment (UE) comprising:

• a transceiver configured to enable wireless communications with a base station and a second UE;
• and
• a processor, communicatively coupled to the transceiver, and configured to:
• generate a side-link control information (SCI) message, wherein the SCI message is configured to trigger the second UE to generate a MAC control element (MAC-CE) message, wherein the MAC-CE message comprises an indicator that indicates a second MAC-CE message to be transmitted within a predetermined time duration after the MAC-CE message is transmitted and a channel state information (CSI) report, and wherein the CSI report comprises one or more CSI reporting elements out of a set of CSI reporting elements;
• transmit, using the transceiver, the SCI message to the second UE via a side-link connection;
• and
• receive, using the transceiver, the MAC-CE message from the second UE via the side-link connection.

A base station comprising:

• a transceiver configured to enable wireless communication with a user equipment (UE);
• and
• a processor, communicatively coupled to the transceiver, and configured to:
• generate a configuration message configured to cause the UE to generate a MAC control element (MAC-CE) message, wherein the MAC-CE message comprises an indicator that indicates a second MAC-CE message to be transmitted within a predetermined time duration after the MAC-CE message is transmitted and a channel state information (CSI) report, and wherein the CSI report comprises one or more CSI reporting elements out of a set of CSI reporting elements;
• and
• transmit, using the transceiver, the configuration message to the UE via a higher layer signaling.