Method for beamforming weights transmission over O-RAN fronthaul interface in C-RANs
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 includes: 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. The method provides a new section extension type sent by the O-DU to the O-RU and including a compression parameter for processing or decompressing the beamforming weights.
1. 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;
wherein a new section extension type is provided, and wherein the O-DU sends the new section extension type to the O-RU, the new section extension type sent by the O-DU including at least one compression parameter for the O-RU to one of process or decompress the beamforming weights.
2. The method of claim 1 , wherein the new section extension type only includes the beam identifiers, and the beamforming weights are not included.
3. The method of claim 1 , wherein the at least one compression parameter includes at least one of i) beamforming weight compression header (bfwCompHdr) and ii) beamforming weight compression parameter (bfwCompParam).
4. The method of claim 3 , wherein at least one of i) the bfwCompHdr is sent once in the section extension type, and ii) the bfwCompParam is sent multiple times in the section extension type.
5. The method of claim 4 , wherein the bfwCompParam is sent once per each bundle of PRBs.