# US 12,003,433 B2 · Interfacing 2G and 3G cellular radio communication systems to a packet-based eCPRI/RoE/O-RAN compliant front haul interface

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- Number: US 12,003,433 B2
- Document ID: US12003433B2
- Status: Granted
- Kind: B2
- Application number: 17/731,449
- Filed: 2022-04-28
- Published: 2022-11-03
- Granted: 2024-06-04
- Earliest claimed: 2021-05-03
- Assignees: Mavenir Systems, Inc.
- Applicants: Mavenir Systems, Inc.
- Inventors: Atanu Guchhait; Prashant Kapoor; Charles Santhosam Lourdu Raja; Nibedita Nandan
- Web page: https://patentgrep.com/patent/US12003433B2

## CPC

- H04L 5/0023: {Time-frequency-space}
- H04B 1/7136: Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform
- H04L 5/0092: {Indication of how the channel is divided}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04B: TRANSMISSION

## Abstract

There is provided, an open radio access network distributed unit (O-DU) having an electronic module that performs an FS-8 Radio Access Technology (RAT) functionality such as frequency hopping, downlink (DL) carrier aggregation, uplink (UL) channelization, power control, and fast automatic gain control (AGC).

## Claims

### Claim 1

An open radio access network distributed unit (O-DU) comprising an electronic module that performs an FS-8 Radio Access Technology (RAT) functionality selected from the group consisting of:
frequency hopping;
downlink (DL) carrier aggregation;
uplink (UL) channelization;
power control; and
fast automatic gain control (AGC);
wherein the O-DU is adapted to provide,
a joint UL component carrier channelizer;
frequency hopping for 2G FS-8 RAT;
power control and AGC for FS-8 RAT;
sample rate conversation over an O-RAN compliant fronthaul carried IQ.

### Claim 2 (depends on 1)

The O-DU of claim 1, further comprising a numerically controlled oscillator and a gain multiplication block for DL frequency hopping for 2G FS-8 RAT.

### Claim 3 (depends on 1)

The O-DU of claim 1, further comprising:
channelization stages for further processing in an UL direction to achieve multiple transmit-receive chain (TRX) via an antenna.

### Claim 4 (depends on 3)

The O-DU of claim 3, wherein said antenna has component carriers from the FS-8 RAT.

### Claim 5 (depends on 3)

The O-DU of claim 3, wherein said antenna has component carriers from different FS-8 RATs.

### Claim 6 (depends on 1)

The O-DU of claim 1, adapted to map a 2G signal to a long-term evolution (LTE) bandwidth equivalent analog stream.

### Claim 7

An open radio access network distributed unit (O-DU) comprising an electronic module that performs an FS-8 Radio Access Technology (RAT) functionality selected from the group consisting of:
frequency hopping;
downlink (DL) carrier aggregation;
uplink (UL) channelization;
power control; and
fast automatic gain control (AGC); and
a numerically controlled oscillator and a gain multiplication block for DL frequency hopping for 2G FS-8 RAT, wherein the O-DU is adapted to provide;
a joint component carrier channelizer;
frequency hopping for 2G FS-8 RAT;
power control and AGC for FS-8 RAT; and
sample rate conversions over an O-RAN compliant fronthaul carried IQ data.

### Claim 8 (depends on 7)

The O-DU of claim 7, further comprising:
channelization stages for further processing in an UL direction to achieve multiple transmit-receive chain (TRX) via an antenna.

### Claim 9 (depends on 8)

The O-DU of claim 8, wherein said antenna has component carriers from an FS-8 RAT.

### Claim 10 (depends on 8)

The O-DU of claim 8, wherein said antenna has component carriers from different FS-8 RATs.

### Claim 11 (depends on 7)

The O-DU of claim 7, adapted to map a 2G signal to a long-term evolution (LTE) bandwidth equivalent analog stream.

### Claim 12

An open radio access network distributed unit (O-DU) comprising an electronic module that performs an FS-8 Radio Access Technology (RAT) functionality selected from the group consisting of:
frequency hopping;
downlink (DL) carrier aggregation;
uplink (UL) channelization;
power control; and
fast automatic gain control (AGC);
wherein the O-DU is adapted to use different radio frequency (RF) frequencies for each of a plurality of antennas to split a 2G bandwidth across said plurality of antennas in multiples of long-term evolution (LTE) equivalent bandwidths.

### Claim 13

An open radio access network distributed unit (O-DU) comprising an electronic module that performs an FS-8 Radio Access Technology (RAT) functionality selected from the group consisting of:
frequency hopping;
downlink (DL) carrier aggregation;
uplink (UL) channelization;
power control; and
fast automatic gain control (AGC); and
a numerically controlled oscillator and a gain multiplication block for DL frequency hopping for 2G FS-8 RAT, wherein the O-DU is adapted to use different radio frequency (RF) frequencies for each of a plurality of antennas to split a 2G bandwidth across said plurality of antennas in multiples of long-term evolution (LTE) equivalent bandwidths.