Methods and apparatuses for multi-TRP transmission in HST scenarios

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

• receiving zone configuration information pertaining to one or more zones, each zone of the one or more zones having one or more zone identifiers (zone-ids), wherein the configuration information indicates, for each respective zone-id of the one or more zone-ids, at least:
• (i) a beam reference signal (BRS) identified by a reference-signal index with quasi-co-location (QCL) type-D;
• (ii) uplink resources associated with each respective zone-id;
• and
• (iii) a set of transmission configuration indicator (TCI) states, a search space, or a control resource set (CORESET) configuration;
• determining a zone-id of the one or more zone-ids, based on a measurement of one or more BRSs indicated by the configuration information;
• monitoring, in a search space associated with the determined zone-id according to a search-space configuration indicated for the determined zone-id, for a physical downlink control channel (PDCCH) transmission;
• receiving downlink control information (DCI) of the PDCCH transmission, the DCI indicating a TCI state, from the set associated with the determined zone-id, for receiving a physical downlink shared channel (PDSCH) transmission;
• determining, based on the determined zone-id, a reference signal (RS) associated with the TCI state indicated by the DCI;
• receiving the PDSCH using an associated PDSCH demodulation reference signal (DMRS) that is quasi co-located with the determined RS;
• and
• transmitting, to a base station, an indication of the determined zone-id, via uplink resources associated with the determined zone-id, wherein the indication is transmitted via one or more of:
• (i) a scheduling request on a physical uplink control channel (PUCCH) scheduling-request resource associated with the determined zone-id;
• (ii) a transmission, on a configured-grant physical uplink shared channel (PUSCH) resource associated with the determined zone-id, of a medium access control (MAC) control element including a zone-id field;
• or
• (iii) a physical random access channel (PRACH) preamble selected from a set of PRACH preambles associated with the determined zone-id.

A wireless transmit/receive unit (WTRU) comprising:

• a receiver configured to receive zone configuration information pertaining to one or more zones having one or more zone identifiers (zone-ids), wherein the configuration information indicates, for each respective zone-id of the one or more zone-ids, at least:
• (i) a beam reference signal (BRS) identified by a reference-signal index with quasi-co-location (QCL) type-D;
• (ii) uplink resources associated with each respective zone-id;
• and
• (iii) a set of transmission configuration indicator (TCI) states, a search space, or a control resource set (CORESET) configuration;
• and
• circuitry configured to indicate, to a base station, a determined zone-id via uplink resources associated with the determined zone-id, the determined zone-id being determined from the one or more zone-ids based on a measurement of one or more BRSs indicated by the configuration information, wherein the indication of the determined zone-id is transmitted via one or more of:
• (i) a scheduling request on a physical uplink control channel (PUCCH) scheduling-request resource associated with the determined zone-id;
• (ii) a transmission, on a configured-grant physical uplink shared channel (PUSCH) resource associated with the determined zone-id, of a medium access control (MAC) control element including a zone-id field;
• or
• (iii) a physical random access channel (PRACH) preamble selected from a set of PRACH preambles associated with the determined zone-id.