Methods, apparatuses, and computer-readable storage media for performing multidimensional beamforming
Methods, apparatuses and computer-readable storage media perform phasing of a first array including one or more antenna elements and phasing of a second array including one or more antenna elements to provide a combined radiation pattern for the first and second arrays, the first array having a first radiation pattern and the second array having a second radiation pattern, wherein the first radiation pattern is substantially orthogonal to the second radiation pattern. The combined radiation pattern is controlled in a first dimension based upon an uplink channel measurement. The combined radiation pattern is controlled in a second dimension based upon a precoding feedback from a user equipment (UE).
1. A method comprising:
phasing a vertical dimension of an array including multiple antenna elements and phasing an azimuthal dimension of the array to provide a combined radiation pattern for the array, the vertical dimension of the array having a first radiation pattern and the azimuthal dimension of the array having a second radiation pattern; and
controlling in a downlink transmission the combined radiation pattern in both the vertical and azimuthal dimensions at least by simultaneously:
controlling in the downlink transmission the combined radiation pattern in the vertical dimension based upon an uplink channel measurement; and
controlling in the downlink transmission the combined radiation pattern in the azimuthal dimension based upon a precoding feedback from a user equipment.
2. The method of claim 1 wherein the first radiation pattern is substantially orthogonal to the second radiation pattern.
3. The method of claim 1 wherein the precoding feedback from the user equipment is a precoder matrix index feedback.
4. The method of claim 1 wherein the uplink channel measurement is based on an uplink signal sent from the user equipment and received at the array.
5. The method of claim 4 wherein the uplink signal is an uplink sounding signal sent from the user equipment.
6. The method of claim 1 wherein the combined radiation pattern is simultaneously, sequentially, or continuously controlled and optimized for each of a plurality of user equipments.
7. The method of claim 1 , wherein phasing, controlling the combined radiation pattern in the vertical dimension, and controlling the combined radiation pattern in the azimuthal dimension are performed via baseband signal processing.
8. An apparatus comprising:
at least one memory including computer program code; and
at least one processor,
the at least one memory and the computer program code configured, with the at least one processor, to cause the apparatus to perform at least the following:
phase a vertical dimension of an array including multiple antenna elements and an azimuthal dimension of the array to provide a combined radiation pattern for the array, the vertical dimension of the array having a first radiation pattern and the azimuthal dimension of the array having a second radiation pattern; and
control in a downlink transmission the combined radiation pattern in both the vertical and azimuthal dimensions at least by simultaneously: controlling in the downlink transmission the combined radiation pattern in the vertical dimension based upon an uplink channel measurement, and controlling in the downlink transmission the combined radiation pattern in the azimuthal dimension based upon a precoding feedback from a user equipment.
9. The apparatus of claim 8 wherein the precoding feedback from the user equipment is a precoder matrix index feedback.
10. The apparatus of claim 8 wherein the uplink channel measurement is based on an uplink sounding signal sent from the user equipment and received at the array.
11. The apparatus of claim 8 wherein the combined radiation pattern is simultaneously, sequentially, or continuously controlled and optimized for each of a plurality of user equipments.
12. The apparatus of claim 8 wherein the first radiation pattern is substantially orthogonal to the second radiation pattern.
13. A non-transitory computer readable storage medium with an executable program stored thereon, wherein the program instructs a processing device to perform:
phasing a vertical dimension of an array including multiple antenna elements and phasing an azimuthal dimension of the array to provide a combined radiation pattern for the array, the vertical dimension of the array having a first radiation pattern and the azimuthal dimension of the array having a second radiation pattern; and
controlling in a downlink transmission the combined radiation pattern in both the vertical and azimuthal dimensions at least by simultaneously:
controlling in the downlink transmission the combined radiation pattern in the vertical dimension based upon an uplink channel measurement; and
controlling in the downlink transmission the combined radiation pattern in the azimuthal dimension based upon a precoding feedback from a user equipment.
14. The non-transitory computer readable storage medium of claim 13 wherein the precoding feedback from the user equipment is a precoder matrix index feedback.
15. The non-transitory computer readable storage medium of claim 13 wherein the uplink channel measurement is based on an uplink sounding signal sent from the user equipment and received at both the first and second arrays.
16. The non-transitory computer readable storage medium of claim 13 wherein the first radiation pattern is substantially orthogonal to the second radiation pattern.