RIM-RS Waveform Generation for O-RAN Split Configuration Overhead
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Solution Overview
Problem
In disaggregated radio access networks, the configuration complexity and network overhead associated with generating and transmitting RIM-RS signals are increased due to the need for the radio unit to switch between different configurations, which is not efficiently addressed in existing O-RAN architectures.
Innovation Solution
The apparatuses and methods described herein allow for the generation of RIM-RS waveforms that are compliant with the O-RAN split between the O-DU and O-RU, optimizing the configuration process to reduce overhead and complexity by ensuring proper allocation and transmission of RIM-RS signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the radio unit switches between different configurations to transmit RIM-RS signals in disaggregated RAN architectures, then the RIM-RS signals can be transmitted with proper O-RAN compliance, but the configuration complexity and network overhead increase
Solution Approach 1:
The BBU performs preliminary actions by determining both frequency domain sequences (first for one OFDM symbol, second for another OFDM symbol) before transmission. This pre-processing of the RIM-RS signals ensures that the radio unit receives ready-to-transmit sequences, eliminating the need for complex real-time configuration switching and reducing operational complexity while maintaining O-RAN compliance
2Reliability
If the radio unit switches between different configurations to transmit RIM-RS signals, then proper O-RAN compliance is achieved, but the network overhead increases
Solution Approach 1:
The invention merges the determination of frequency domain sequences for multiple OFDM symbols into a unified process at the BBU. By combining the sequence determination for the first and second OFDM symbols into single operational steps, the patent reduces the number of separate configuration messages and signaling overhead that would otherwise be required to manage multiple independent configurations, thus reducing network overhead while ensuring O-RAN compliance
Data Source
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AI summary
An apparatus including: a memory, and a processor configured to: determine, for a remote interference management reference signal, a first frequency domain sequence comprising a plurality of first frequency domain symbols, wherein each first frequency domain symbol corresponds to a subcarrier of a plurality of subcarriers; determine a second frequency domain sequence comprising a plurality of second frequency domain symbols, wherein each second frequency domain symbol at a respective subcarrier comprises a phase rotated version of the respective first frequency symbol at the respective subcarrier, in which the respective first frequency symbol is phase rotated based on the respective subcarrier and a cyclic prefix length; and instruct to send information representing the second frequency domain sequence and the first frequency domain sequence to a radio unit of a cellular network for a transmission in consecutive orthogonal frequency division multiplex symbols.