RF Remote Unit Phase Compensation via Baseband to Reduce FPGA Load
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Solution Overview
Problem
The existing Open RAN architecture relies heavily on field programmable gate arrays (FPGA) for phase compensation, leading to high computing power requirements and dependency, which is inefficient and costly.
Innovation Solution
A phase compensation method involving conversion of time domain data to frequency domain data by an RF remote unit hub and resource de-mapping by a baseband processing unit to achieve phase compensation for different channels, reducing the computational load on the FPGA.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase compensation is performed in the frequency domain for all channels except PRACH, then phase accuracy is improved, but computing power requirements and FPGA dependency increase
Solution Approach 1:
The patent segments the signal processing pipeline by separating time-domain processing (FFT conversion) from frequency-domain processing (phase compensation). The RRU Hub performs FFT conversion to transform time-domain signals to frequency-domain signals, then performs phase compensation only on specific channels (PUSCH, PUCCH, SRS) in the frequency domain, while PRACH is handled differently. This segmentation allows phase compensation to be applied selectively rather than universally, reducing unnecessary computing power consumption while maintaining phase accuracy where needed.
2Reliability
If phase compensation is performed for all channels, then communication quality is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent applies local quality by performing phase compensation selectively on specific channels (PUSCH, PUCCH, SRS) that require it, while excluding PRACH from frequency-domain phase compensation. Different channels receive different processing treatments based on their specific requirements: uplink data and control channels undergo phase compensation to ensure communication quality, while the random access channel uses a different approach. This localized application of phase compensation improves communication quality where needed without unnecessarily increasing processing overhead for all channels.
Data Source
AI summary
A phase compensation method includes: converting, by a radio frequency (RF) remote unit hub, time domain data received from an RF remote unit into frequency domain data; and performing, by a baseband processing unit, resource de-mapping on the frequency domain data to obtain a first time-frequency resource with phase compensation completed and a second time-frequency resource without phase compensation. The first time-frequency resource corresponds to a first channel and the second time-frequency resource corresponds to a second channel.