Rotational alignment for multiple-input multiple-output devices

A method for wireless communication at a second wireless device, comprising:

• transmitting a first capability message indicating that the second wireless device supports a panel rotation capability;
• receiving a second capability message indicating that a first wireless device supports the panel rotation capability, the panel rotation capability associated with a capability of a respective wireless device to adjust an angular rotation of an antenna panel of the respective wireless device;
• communicating, with the first wireless device, a panel rotation procedure configuration based at least in part on the panel rotation capability, wherein the panel rotation procedure configuration comprises scheduling information for one or more reference signals;
• transmitting a reference signal of the one or more reference signals via a central antenna element of a second antenna panel of the second wireless device based at least in part on the panel rotation procedure configuration;
• and
• receiving, by the second wireless device, a message indicating alignment feedback information for the second antenna panel of the second wireless device and a first antenna panel of the first wireless device based at least in part on the reference signal.

An apparatus for wireless communication at a first wireless device, comprising:

• one or more processors;
• one or more memories coupled with the one or more processors;
• and
• instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to:
• transmit a first capability message indicating that the first wireless device supports a panel rotation capability;
• receive a second capability message indicating that a second wireless device supports the panel rotation capability, the panel rotation capability associated with a capability of a respective wireless device to adjust an angular rotation of an antenna panel of the respective wireless device;
• receive a configuration message that comprises a panel rotation procedure configuration based at least in part on the panel rotation capability, wherein the panel rotation procedure configuration comprises scheduling information for one or more reference signals;
• receive, via a first set of two or more antenna elements of a plurality of antenna elements of a first antenna panel of the first wireless device, a reference signal of the one or more reference signals based at least in part on the panel rotation procedure configuration, wherein the reference signal is transmitted by a central antenna element of a second antenna panel of the second wireless device;
• adjust, based at least in part on measurements of the reference signal at the first set of two or more antenna elements, an angular rotation of the first antenna panel of the first wireless device to modify a respective distance between each of the first set of two or more antenna elements of the first antenna panel relative to the central antenna element of the second antenna panel of the second wireless device;
• and
• transmit, to the second wireless device, a message indicating alignment feedback information for the first antenna panel and the second antenna panel.

An apparatus for wireless communication at a second wireless device, comprising:

• one or more processors;
• one or more memories coupled with the one or more processors;
• and
• instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to:
• transmit a first capability message indicating that the second wireless device supports a panel rotation capability;
• receive a second capability message indicating that a first wireless device supports the panel rotation capability, the panel rotation capability associated with a capability of a respective wireless device to adjust an angular rotation of an antenna panel of the respective wireless device;
• communicate, with the first wireless device, a panel rotation procedure configuration based at least in part on the panel rotation capability, wherein the panel rotation procedure configuration comprises scheduling information for one or more reference signals;
• transmit a reference signal of the one or more reference signals via a central antenna element of a second antenna panel of the second wireless device based at least in part on the panel rotation procedure configuration;
• and
• receive, by the second wireless device, a message indicating alignment feedback information for the second antenna panel of the second wireless device and a first antenna panel of the first wireless device based at least in part on the reference signal.