O-RAN RIM-RS Waveform Mapping for Lower 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 increase due to the need for the radio unit to switch between different configurations for various signals, including RIM-RS, which is particularly challenging in 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 O-DU and O-RU, optimizing the configuration process to minimize overhead and complexity by ensuring proper allocation and presence of RIM-RS in designated resource elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the radio unit switches between different configurations for various signals including RIM-RS, then the network can support multiple signal types and functions, but the configuration complexity and network overhead increase
Solution Approach 1:
The patent applies universality by designing the RIM-RS signal to use the same configuration parameters and resource allocation mechanisms as other reference signals in the O-RAN architecture. The RIM-RS waveform generation, resource element mapping, and transmission procedures are unified with existing signal types, allowing the radio unit to handle multiple signal types without requiring separate configuration pathways. This multi-functional approach enables the system to support RIM-RS alongside other reference signals while maintaining a single, streamlined configuration process.
2Adaptability or versatility
If the radio unit switches between different configurations for various signals including RIM-RS, then the network can support multiple signal types and functions, but the network overhead increases
Solution Approach 1:
The patent reduces network overhead by making the RIM-RS configuration universal with existing reference signal mechanisms. The same configuration parameters, resource allocation procedures, and signaling protocols used for other reference signals are applied to RIM-RS. This eliminates the need for separate, duplicate configuration messages and reduces the overall quantity of configuration data that must be transmitted across the network interface between the distributed unit and radio unit.
3Reliability
If the RIM-RS is properly allocated in designated resource elements with optimized configuration, then the interference management effectiveness improves, but the configuration process becomes more complex
Solution Approach 1:
The patent applies preliminary action by pre-defining the resource element allocation patterns and configuration parameters for RIM-RS in the standardized O-RAN specification. The resource element mapping, waveform generation parameters, and transmission timing are predetermined and documented in advance. This allows the radio unit to be pre-configured with the necessary parameters before actual RIM-RS transmission begins, ensuring proper interference management from the start without requiring complex real-time configuration adjustments.
Data Source
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.