Method for indicating a beam correspondence failure

A first apparatus for wireless communication, comprising:

• a transmit antenna array and a receive antenna array, the transmit antenna array being separate from the receive antenna array;
• a memory;
• and
• at least one processor coupled to the memory and configured to:
• form a transmit beam in a first direction at the transmit antenna array and a receive beam in a second direction at the receive antenna array, wherein the transmit beam and the receive beam are formed for communication with a second apparatus;
• wherein the first direction and the second direction point toward at least one object capable of passively reflecting, diffracting, or scattering wireless communication signals along a non-line of sight (NLOS) communication link to or from the second wireless communication device;
• determine a signal strength threshold based on a difference between a peak gain value for the transmit beam or the receive beam and a threshold gain control value;
• determine a beam correspondence threshold based on a beamwidth of the transmit beam or a beamwidth of the receive beam, wherein the beamwidth of the transmit beam or the beamwidth of the receive beam is determined based on the signal strength threshold for the transmit beam or the receive beam;
• monitor a difference between the first direction of the transmit beam and the second direction of the receive beam, including configuring the at least one processor to:
• determine a distance from the transmit antenna array or the receive antenna array to the at least one object;
• and
• determine a difference between the first direction and the second direction based on the distance from the transmit antenna array or the receive antenna array to the at least one object and a distance between the transmit antenna array and the receive antenna array;
• and
• transmit an indication of a beam correspondence failure to the second apparatus when the difference between the first direction and the second direction is greater than or equal to a beam correspondence threshold.

A first apparatus for wireless communication including a transmit antenna array and a receive antenna array, the transmit antenna array being separate from the receive antenna array, comprising:

• means for forming a transmit beam in a first direction at the transmit antenna array and a receive beam in a second direction at the receive antenna array, wherein the transmit beam and the receive beam are formed for communication with a second apparatus, and wherein the first direction and the second direction point toward at least one object capable of passively reflecting, diffracting, or scattering wireless communication signals along a non-line of sight (NLOS) communication link to or from the second wireless communication device;
• means determining a signal strength threshold based on a difference between a peak gain value for the transmit beam or the receive beam and a threshold gain control value;
• means for determining a beam correspondence threshold based on a beamwidth of the transmit beam or a beamwidth of the receive beam, wherein the beamwidth of the transmit beam or the beamwidth of the receive beam is determined based on the signal strength threshold for the transmit beam or the receive beam;
• means for monitoring a difference between the first direction of the transmit beam and the second direction of the receive beam, wherein the means for monitoring comprises:
• means for determining a distance from the transmit antenna array or the receive antenna array to the at least one object;
• and
• means for determining a difference between the first direction and the second direction based on the distance from the transmit antenna array or the receive antenna array to the at least one object and a distance between the transmit antenna array and the receive antenna array;
• and
• means for transmitting an indication of a beam correspondence failure to the second apparatus when the difference between the first direction and the second direction is greater than or equal to a beam correspondence threshold.

A non-transitory computer-readable medium storing computer executable code, the code when executed by a processor causes the processor to:

• form a transmit beam in a first direction at a transmit antenna array and a receive beam in a second direction at a receive antenna array, wherein the transmit antenna array is separate from the receive antenna array, and wherein the transmit beam and the receive beam are formed for communication with a wireless communication device;
• wherein the first direction and the second direction point toward at least one object capable of passively reflecting, diffracting, or scattering wireless communication signals along a non-line of sight (NLOS) communication link to or from the second wireless communication device;
• determine a signal strength threshold based on a difference between a peak gain value for the transmit beam or the receive beam and a threshold gain control value;
• determine a beam correspondence threshold based on a beamwidth of the transmit beam or a beamwidth of the receive beam, wherein the beamwidth of the transmit beam or the beamwidth of the receive beam is determined based on the signal strength threshold for the transmit beam or the receive beam;
• monitor a difference between the first direction of the transmit beam and the second direction of the receive beam, comprising code that causes the processor to:
• determine a distance from the transmit antenna array or the receive antenna array to the at least one object;
• determine a difference between the first direction and the second direction based on the distance from the transmit antenna array or the receive antenna array to the at least one object and a distance between the transmit antenna array and the receive antenna array;
• and
• transmit an indication of a beam correspondence failure to the wireless communication device when the difference between the first direction and the second direction is greater than or equal to a beam correspondence threshold.