Method and apparatus for beam determination

A network apparatus for wireless communication, comprising:

• at least one memory;
• and
• at least one processor coupled with the at least one memory and configured to cause the network apparatus to:
• transmit an indication indicating a joint or downlink common beam mechanism is applied for a set of control resource sets (CORESETs) configured for a user equipment (UE) in a cell;
• and
• for a CORESET of the set of CORESETs, in a case that there are two joint or downlink common transmission configuration indication (TCI), states indicated by a downlink control information (DCI) applicable in a slot, transmit physical downlink control channel (PDCCH) in the CORESET in the slot, wherein:
• in the case that the CORESET is configurable with one TCI state, a demodulation reference signal (DM-RS) antenna port of the PDCCH is quasi co-located with a set of RSs in one joint or downlink common TCI state of the two joint or downlink common TCI states, wherein the one joint or downlink common TCI state is determined for the CORESET based on one or more of default configuration information or signaled configuration information.

A method performed by a user equipment (UE), the method comprising:

• receiving an indication indicating a joint or downlink common beam mechanism is applied for a set of control resource sets (CORESETs) configured for 24 the UE in a cell;
• and
• for a CORESET of the set of CORESETs, in a case that there are two joint or downlink common transmission configuration indication (TCI) states indicated by a downlink control information (DCI) applicable in a slot, monitoring physical downlink control channel (PDCCH) in the CORESET in the slot, wherein:
• in a case that the CORESET is configurable with one TCI state, a demodulation reference signal (DM-RS) antenna port of the PDCCH is quasi co-located with a set of RSs in one joint or downlink common TCI state of the two joint or downlink common TCI states, wherein the one joint or downlink common TCI state is determined for the CORESET based on one or more of default configuration information or signaled configuration information.

A processor for wireless communication, comprising:

• at least one controller coupled with at least one memory and configured to cause the processor to:
• receive an indication indicating a joint or downlink common beam mechanism is applied for a set of control resource sets (CORESETs) configured for a user equipment (UE) in a cell;
• and
• for a CORESET of the set of CORESETs, in a case that there are two joint or downlink common transmission configuration indication (TCI) states indicated by a downlink control information (DCI) applicable in a slot, monitor physical downlink control channel (PDCCH) in the CORESET in the slot, wherein:
• in a case that the CORESET is configurable with one TCI state, a demodulation reference signal (DM-RS) antenna port of the PDCCH is quasi co-located with a set of RSs in one joint or downlink common TCI state of the two joint or downlink common TCI states, wherein the one joint or downlink common TCI state is determined for the CORESET based on one or more of default configuration information or signaled configuration information.