Methods, apparatuses and systems related to sub-array selection for near-field uplink

A wireless transmit/receive unit (WTRU) comprising a processor, a transmitter, a receiver and a memory, configured to:

• receive a first message comprising configuration information indicating a plurality of downlink reference signal (DL RS) resources, a set of one or more uplink reference signal (UL RS) resources, and a channel state information (CSI) reporting setting;
• perform one or more measurements on one or more DL RSs;
• determine a subset of DL RS resources based on the performed one or more measurements;
• transmit a CSI report comprising first information indicating the determined subset of DL RS resources, wherein the CSI report is based on the CSI reporting setting;
• determine one or more spatial domain filters based on the determined subset of DL RS resources;
• and
• transmit a subset of one or more UL RS resources of the set of one or more UL RS resources using the determined one or more spatial domain filters.