Granted Patent B2

US 11,043,998 · App. 17/068,274 · Granted Jun 22, 2021

Abstract

Claims (35)

1. A method of enabling an Open RAN-compatible radio unit (O-RU) to apply beamforming weights to physical resource blocks (PRBs), comprising:

specifying one of (i) a first mode of operation in which the number of beamforming weights in section extension type 1 of a section extension is equal to L*numPrbs, or (ii) a second mode of operation in which the number of beamforming weights is equal to L, wherein L is the number of transceivers (TRX) or processing chains and numPrbs is the number of physical resource blocks (PRBs);

signaling, by an Open RAN-compatible distributed unit (O-DU) to the O-RU, one of the first mode of operation at the O-RU, by specifying a value of parameter extLen to be zero, or the second mode of operation at the O-RU, by specifying a value of parameter extLen to be greater than 0, wherein extLen is the length of the section extension.

2. The method of claim 1 , wherein one of (i) in the case the value of parameter extLen is equal to 0, O-RU applies the beamforming weights respectively across the TRX first and then across the PRBs, or (ii) in the case the value of parameter extLen is greater than 0, the O-RU applies the beamforming weights respectively across the TRX for a first PRB, and the same set of beamforming weights are applied across the TRX for each of the remaining PRBs defined by a parameter numPrbc in the C-plane message.

3. The method of claim 2 , wherein in the case the value of parameter extLen is equal to 0, the O-RU applies the kth beamforming weights (bfwI and bfwQ), k=1, 2, . . . , L*numPrbc in section extension type 1 for TRX j, j=0, 1, . . . , L−1 to the ith PRB, i=1, 2, . . . , numPrbc defined under the sectionId of the C-plane message.

4. A method of enabling an Open RAN-compatible radio unit (O-RU) to apply different beamforming weights to different physical resource blocks (PRBs) using a single sectionId and a single section extension type of a section extension, comprising:

specifying a first mode of operation in which flexible sending of beamforming weights from Open RAN-compatible distributed unit (O-DU) to Open RAN-compatible radio unit (O-RU) is provided; and

providing, by the O-DU to the O-RU, i) a first parameter specifying the number of bundled physical resource blocks (PRBs) per a set of in-phase/quadrature (I/Q) beamforming weight pairs, each beamforming weight pair comprising an in-phase value and a quadrature value, and ii) a plurality of beamforming weight pairs for a plurality of transceivers associated with each bundle of PRBs.

5. The method of claim 4 , wherein a beam identifier field for the beamforming weights is not provided.

6. The method of claim 4 , wherein multiple beam identifier fields for the beamforming weights are provided.

7. The method of claim 4 , wherein a new section extension type is provided, and wherein when the number of I/Q beamforming weight pairs per each transceiver in the new extension type is not equal to the total number of PRBs divided by the first parameter, one additional I/Q beamforming weight for each respective transceiver is provided.

8. The method of claim 4 , wherein a new section extension type is provided, and wherein when the number of I/Q beamforming weight pairs per each transceiver in the new extension type is not equal to the total number of PRBs divided by the first parameter, orphan PRBs in excess of the I/Q beamforming weight pairs in the new extension type are beamformed using a set of I/Q beamforming weights used for a previous PRB bundle.

9. The method of claim 5 , wherein a new section type is provided, and wherein the new section type substantially corresponds to O-RAN section type 1, with the exception of the beam identifier field.

10. The method of claim 5 , wherein a new section type is provided, and wherein the new section type substantially corresponds to O-RAN section type 3, with the exception of the beam identifier field.

11. The method of claim 6 , wherein a new section type is provided, and wherein the new section type substantially corresponds to O-RAN section type 1.

12. The method of claim 6 , wherein a new section type is provided, and wherein the new section type substantially corresponds to O-RAN section type 3.

13. The method of claim 4 , wherein a new section extension type is provided, and wherein i) a set of beam identifiers is provided consecutively in the new section extension type, and ii) following the set of beam identifiers, sets of beamforming weights are provided for PRB bundles, one set of beamforming weights for each PRB bundle.

14. The method of claim 5 , further comprising:

providing a new section extension type;

sending, by the O-DU to the O-RU, a single beam identifier in a predefined section type of O-RAN;

sending, by the O-DU to the O-RU, the new extension type with multiple sets of beamforming weights corresponding to the predefined section type of O-RAN with the single beam identifier;

applying, by the O-RU, the single beam identifier for the first set of beamforming weights in the new extension type; and

incrementing, by the O-RU, the beam identifier by one for subsequent sets of beamforming weights in the new extension type.

15. The method of claim 12 , further comprising:

sending, by the O-DU to the O-RU, two separate control-plane (C-P) messages each having a different compression header.

16. The method of claim 15 , wherein:

in the first C-P message, the O-DU uses an existing section extension type to represent the beamforming weights for a first portion of the PRB; and

in the second C-P message, the O-DU provides the new section extension type.

17. The method of claim 16 , wherein the new section extension type only includes the beam identifiers, and the beamforming weights are not included.

18. The method of claim 17 , wherein the O-RU uses the beam identifiers in the new section extension type to identify the beamforming weights received in the first C-plane message.

19. The method of claim 6 , wherein multiple beam identifier fields for the beamforming weights are provided in the section extension, one beam identifier field per each PRB bundle.

20. The method of claim 4 , wherein:

each set of beamforming weight pairs comprises L weight pairs, L=1 or more;

numBundPrb=1 or more; and

multiple sets of beamforming weight pairs are provided, each set being provided for a corresponding bundle of PRBs.

Assignments (13)