Dynamic demodulation reference signal configuration signaling for adaptation with different transmission modes

A method for wireless communication at a base station, comprising:

• communicating with a user equipment (UE) via a first transmission reception point and a second transmission reception point of the base station according to a first transmission mode for multiple transmission reception points;
• transmitting first demodulation reference signals via the first transmission reception point and the second transmission reception point according to a first demodulation reference signal configuration of a set of demodulation reference signal configurations;
• transmitting an indication to switch to a second transmission mode for the multiple transmission reception points;
• and
• transmitting second demodulation reference signals via the first transmission reception point and the second transmission reception point according to a second demodulation reference signal configuration of the set of demodulation reference signal configurations based at least in part on the second transmission mode.

An apparatus for wireless communication 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 first control signaling identifying a set of demodulation reference signal configurations;
• receive second control signaling activating a first demodulation reference signal configuration and a second demodulation reference signal configuration of the set of demodulation reference signal configurations;
• receive an indication for the UE to use a first transmission mode of a set of transmission modes to communicate with multiple transmission reception points, including a first transmission reception point and a second transmission reception point;
• select at least one of the first demodulation reference signal configuration or the second demodulation reference signal configuration based at least in part on the indicated first transmission mode and a set of associations between the set of transmission modes and the set of demodulation reference signal configurations, wherein the set of associations indicate that the at least one of the first demodulation reference signal configuration or the second demodulation reference signal configuration is associated with the first transmission mode;
• and
• receive demodulation reference signals from the first transmission reception point and the second transmission reception point according to the selected at least one of the first demodulation reference signal configuration or the second demodulation reference signal configuration.

An apparatus for wireless communication at a base station, comprising:

• a processor;
• memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• communicate with a user equipment (UE) via a first transmission reception point and a second transmission reception point of the base station according to a first transmission mode for multiple transmission reception points;
• transmit first demodulation reference signals via the first transmission reception point and the second transmission reception point according to a first demodulation reference signal configuration of a set of demodulation reference signal configurations;
• transmit an indication to switch to a second transmission mode for the multiple transmission reception points;
• and
• transmit second demodulation reference signals via the first transmission reception point and the second transmission reception point according to a second demodulation reference signal configuration of the set of demodulation reference signal configurations based at least in part on the second transmission mode.