Space division multiplexing mapping of transmission configuration indicator states to a control channel

An apparatus for wireless communications at a user equipment (UE), comprising:

• at least one processor, and
• memory coupled to the at least one processor, the memory storing instructions executable by the at least one processor to cause the UE to:
• receive a configuration message indicating that a control resource set for a downlink control channel is associated with a plurality of transmission configuration indicator (TCI) states;
• identify an association between resources of the control resource set and the plurality of TCI states based at least in part on a space division multiplexing mapping, wherein each resource element group in a first symbol of the control resource set includes one or more resource elements that are associated with a first demodulation reference signal port and one or more resource elements that are associated with a second demodulation reference signal port, wherein additional resource element groups in additional symbols of the control resource set do not include resource elements assigned for demodulation reference signals, and wherein the first demodulation reference signal port is associated with a first TCI state of the plurality of TCI states and the second demodulation reference signal port is associated with a second TCI state of the plurality of TCI states;
• and
• decode the downlink control channel based at least in part on the space division multiplexing mapping.

An apparatus for wireless communications at a network device, comprising:

• at least one processor, and
• memory coupled to the at least one processor, the memory storing instructions executable by the at least one processor to cause the network device to:
• identify an association between resources of a control resource set for a downlink control channel and a plurality of transmission configuration indicator (TCI) states for the control resource set based at least in part on a space division multiplexing mapping, wherein each resource element group in a first symbol of the control resource set includes resource elements that are collectively associated with both a first demodulation reference signal port and a second demodulation reference signal port, wherein additional resource element groups in additional symbols of the control resource set do not include resource elements assigned for demodulation reference signals, and wherein the first demodulation reference signal port is associated with a first TCI state of the plurality of TCI states and the second demodulation reference signal port is associated with a second TCI state of the plurality of TCI states;
• and
• transmit a configuration message indicating that the control resource set is associated with the plurality of TCI states.