Beam acquisition for a reconfigurable intelligent surface

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

• a processor;
• and
• a memory coupled with the processor, with instructions stored in the memory, the instructions being executable by the processor to cause the apparatus to:
• receive, from a base station, an indication of a change to a second beam training procedure between the base station and the UE via a reflective surface, the second beam training procedure associated with a subset of configurations of a set of configurations of the reflective surface;
• update one or more beam training parameters based at least in part on receiving the indication of the change to the second beam training procedure;
• and
• transmit, to the base station, a measurement report indicating one or more second signal strength measurements associated with the second beam training procedure.

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

• a processor;
• and
• a memory coupled with the processor, with instructions stored in the memory, the instructions being executable by the processor to cause the apparatus to:
• transmit, to a device comprising a reflective surface, a first set of reference signals as part of a first beam training procedure between the reflective surface and the base station, the first beam training procedure associated with a set of configurations for a reflective characteristic of the reflective surface;
• transmit, to the device comprising the reflective surface, an indication of a first beam for directional communication to the reflective surface based at least in part on a set of success ratios associated with the set of configurations;
• and
• transmit, to a user equipment (UE), an indication of a change to a second beam training procedure between the base station and the UE via the reflective surface based at least in part on transmitting the indication of the first beam to the reflective surface, the second beam training procedure associated with a subset of configurations of the set of configurations of the reflective surface that is associated with the first beam.

A method for wireless communication at a device comprising a reflective surface, comprising:

• configuring, as part of a first beam training procedure between the reflective surface and a base station, a reflection characteristic of the reflective surface in accordance with a set of configurations associated with the reflective surface;
• receiving an indication of a first beam for directional communication from the base station based at least in part on a set of success ratios associated with the set of configurations;
• and
• receiving an indication of a configuration of the reflective surface for reflecting communications between the base station and a user equipment (UE) based at least in part on the first beam for the directional communication from the base station and a second beam training procedure between the base station and the UE via the reflective surface.