Efficient signaling of beam shape information

A method of wireless communication at a first wireless device, comprising:

• receiving a set of indications for each beam zone of a plurality of beam zones, wherein the set of indications comprises, for each beam zone of the plurality of beam zones, (a) a first indication of a full beam shape of a prototypical beam associated with the beam zone, and (b) a second indication of a first difference in beam shape amplitude and a third indication of a second difference in beam shape phase for each beam of a set of non-prototypical beams associated with the beam zone;
• and
• deriving at least one of an angle of arrival (AoA) or an angle of departure (AoD) of a channel based on the set of indications.

A method of wireless communication at a first wireless device, comprising:

• partitioning a panel of the first wireless device into a plurality of beam zones, wherein each beam zone is associated with a prototypical beam and a set of non-prototypical beams;
• and
• transmitting a set of indications for each beam zone of the plurality of beam zones, wherein the set of indications comprises, for each beam zone of the plurality of beam zones, (a) a first indication of a full beam shape of the prototypical beam associated with the beam zone, and (b) a second indication of a first difference in beam shape amplitude and a third indication of a second difference in beam shape phase for each beam of the set of non-prototypical beams associated with the beam zone.