Indication of reconfigurable intelligent surface participation in a communication

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

• a memory;
• and
• one or more processors, coupled to the memory, configured to:
• receive configuration information indicating that signals associated with DMRSs having different phases are associated with a reconfigurable intelligent surface (RIS);
• receive a signal including a plurality of DMRSs, wherein a first DMRS of the plurality of DMRSs is associated with a first phase and a second DMRS of the plurality of DMRSs is associated with a second phase different than the first phase;
• and
• perform a communication based at least in part on the first DMRS and the second DMRS having different phases.

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

• a memory;
• and
• one or more processors, coupled to the memory, configured to:
• transmit, to a controller of a reconfigurable intelligent surface (RIS), first configuration information indicating to configure a set of reflection coefficients for a set of reflective elements of the RIS such that a first demodulation reference signal (DMRS) of a plurality of DMRSs of a signal is reflected with a first beamformer and a second DMRS of the plurality of DMRSs is reflected with a second beamformer, wherein the first beamformer is associated with a first phase and the second beamformer is associated with a second phase;
• and
• transmit, to a user equipment (UE), second configuration information indicating that signals associated with the first DMRS having the first phase and the second DMRS having the second phase are associated with the RIS.