Enabling 2G and 3G cellular radio communications over a packet-based open radio access network fronthaul interface
There is provided an Open Radio Access Network (O-RAN) that includes a fronthaul interface over which an O-RAN Distributed Unit (O-DU) and an O-RAN Radio Unit (O-RU) communicate with one another and exchange O-RAN standard defined user-plane (U-plane) packets and control-place (C-Plane) packets. The fronthaul interface carries control and management information via management-plane (M-Plane) message exchange, and timing synchronization is achieved in accordance with synchronization-plane (S-Plane) procedures, and the O-RAN accommodates communications via 2G and 3G based mobile networks.
1. An Open Radio Access Network, O-RAN, comprising:
a fronthaul, FH, interface over which an O-RAN Distributed Unit, O-DU, and an O-RAN Radio Unit, O-RU, communicate with one another and exchange O-RAN standard defined user-plane, U-plane, packets and control-place, C-Plane, packets,
wherein said fronthaul interface carries control and management information via management-pane (M-Plane) message exchange, and timing synchronization is achieved in accordance with synchronization-plane (S-Plane) procedures, and
wherein said O-RAN accommodates communications via 2G and 3G based mobile networks, wherein said O-DU for a 2G based mobile network comprises modules for functions:
(a) TCH (Traffic Channel)/CCH (Control Channel) for generation/reception;
(b) encoding/decoding and interleaving/de-interleaving;
(c) burst handling, multiplexing/de-multiplexing;
(d) encoding and modulation/demodulation functions;
(e) additional DFE (digital front end) functions; and
(f) FH interface functions and real time control; and
wherein said O-DU for a 3G based mobile network comprises modules for functions,
(a) TCH/CCH generation/reception;
(b) Forward Error Correction (FEC) encoding/decoding;
(c) interleaving/de-interleaving, spreading/de-spreading, scrambling de-scrambling;
(d) modulation and filtering/filtering-demodulation functions;
(e) processing to convert to frequency domain and target sample rate and additional DFE functions; and
(f) FH interface functions and real time control.
2. The O-RAN of claim 1 , wherein said O-DU and said O-RU support functional split-8 (FS-8) radio access technology (RAT), 2G and 3G RAT, and 7.2 x-RAT to co-exist in said O-RAN.
3. The O-RAN of claim 1 , wherein said O-RU comprises FS-8 radio access technology (RAT) radio processing blocks for 2G.
4. The O-RAN of claim 3 , wherein said FS-8 RAT radio processing blocks comprise:
(a) fronthaul interface functions and real time control;
(b) IQ compression/de-compression; and
(c) digital front end (DFE) processing.
5. The O-RAN of claim 1 , wherein said O-RU comprises FS-8 radio access technology (RAT) radio processing blocks for 3G.
6. The O-RAN of claim 5 , wherein said FS-8 RAT radio processing blocks comprise:
(a) fronthaul interface functions and real time control;
(b) IQ compression/de-compression; and
(c) DFE processing.
7. The O-RAN of claim 1 , wherein said O-RU processes for 2G and 3G radio access technology (RAT) without the use of physical random-access channel (PRACH).
8. The O-RAN of claim 1 , wherein said fronthaul interface accommodates IQ downlink/uplink (DL/UL) data transfer between said O-DU and said O-RU for FS-8 radio access technology (RAT).
9. The O-RAN of claim 8 , wherein said fronthaul interface utilizes U-Plane frame structure and header field formats to carry FS-8 radio access technology (RAT) IQ samples to/from said O-RU over said fronthaul interface with a frame structure compatible for carrying FS7.2 x-RAT IQ samples to/from said O-RU over said fronthaul interface.
10. The O-RAN of claim 8 , wherein said fronthaul interface utilizes U-Plane header field definitions for 2G/3G operations.
11. The O-RAN of claim 8 , wherein said fronthaul interface only has a requirement for a C-plane message for U-Plane data processing in said O-RU for O-RU power control via C-Plane Type-0 packets from said O-DU.