Reference signal port mapping for control channels

A method for wireless communications at a user equipment (UE), comprising:

• receiving a configuration message indicating that a control resource set for a downlink control channel is associated with a transmission configuration indicator state for the UE;
• determining, based at least in part on the configuration message, that a first set of demodulation reference signal resource elements in a first symbol of the control resource set correspond to a first demodulation reference signal port associated with a first transmission configuration indicator state and that a second set of demodulation reference signal resource elements, corresponding to the first set of demodulation reference signal resource elements, in a second symbol of the control resource set are excluded from channel estimation by the UE;
• and
• decoding the downlink control channel based at least in part on the determining.

A method for wireless communications at a user equipment (UE), comprising:

• receiving, from a network device, a configuration message indicating that a control resource set for a downlink control channel is associated with a plurality of reference signal ports;
• determining a number of control channel candidates limit or a number of control channel element limit for the downlink control channel based at least in part on the configuration message;
• counting a number of monitored control channel candidates or a number of non-overlapped control channel elements based at least in part on a weighting factor and a number of the plurality of reference signal ports of the control resource set;
• and
• monitoring one or more search space sets for the downlink control channel based at least in part on the determining.

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

• a processor,
• memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• receive, via radio resource control signaling, a configuration message indicating that a control resource set for a downlink control channel is associated with a plurality of demodulation reference signal ports;
• determine, based at least in part on the configuration message, that a first set of demodulation reference signal resource elements in a first symbol of the control resource set correspond to a first demodulation reference signal port of the plurality of demodulation reference signal ports and a second set of demodulation reference signal resource elements in a second symbol of the control resource set correspond to a second demodulation reference signal port of the plurality of demodulation reference signal ports, wherein the first symbol is different from the second symbol and the first demodulation reference signal port is different from the second demodulation reference signal port;
• and
• decode the downlink control channel based at least in part on the determining.