Methods, apparatus, and systems for delay spread measurement, reporting, and cyclic prefix determination

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

• receiving configuration information indicating a first transmission configuration indicator (TCI) state, a second TCI state, a first cyclic prefix (CP) size, a first channel state information-reference signal (CSI-RS) resource set, and a second CSI-RS resource set;
• determining a first delay spread and a first measurement value associated with a first CSI-RS, wherein the first CSI-RS is received in a first CSI-RS resource based on the first TCI state and the first CP size, wherein the first CSI-RS resource is a CSI-RS resource in the first CSI-RS resource set;
• determining a second delay spread and a second measurement value associated with a second CSI-RS, wherein the second CSI-RS is received in a second CSI-RS resource based on the second TCI state and a second CP size, wherein the second CSI-RS resource is a CSI-RS resource in the second CSI-RS resource set;
• and
• sending a first indication indicating whether the first delay spread is greater than or less than the first CP size.