DU/RU Uplink Decoding with Reference-Signal Frequency Offset Detection
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently decoding signals due to frequency offsets, particularly in environments with high mobility, such as high-speed trains, leading to signal reception failures and increased installation costs for base stations with smaller cell coverage.
Innovation Solution
A method and electronic device are provided to identify and compensate for frequency offsets by performing initial and additional decoding based on phase information of reference signals, using a digital unit (DU) and radio unit (RU) to enhance signal reception in a wireless communication system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If base stations with smaller cell coverage are deployed to reduce installation costs, then device complexity and installation burden are reduced, but signal reception reliability deteriorates in high mobility environments due to frequency offsets
Solution Approach 1:
The system performs preliminary frequency offset estimation using reference signals before actual data reception. By pre-identifying frequency offsets in advance using dedicated reference signals, the system prepares compensation parameters proactively, enabling reliable signal reception in high mobility environments without requiring complex base station deployments
Solution Approach 2:
The system establishes a feedback loop where reference signals are continuously monitored to detect frequency offsets, and decoding results are used to verify and refine frequency offset estimates. This closed-loop approach allows real-time adaptation to changing channel conditions, maintaining reception reliability while using simpler base station configurations
2Measurement precision
If frequency offset estimation is performed using reference signals, then signal decoding accuracy is improved, but processing time and complexity increase
Solution Approach 1:
Frequency offset estimation is performed preliminarily using reference signals embedded in the transmitted signal before actual data decoding. This advance estimation allows the system to prepare frequency offset compensation parameters proactively, reducing the processing time required during actual data reception while maintaining high estimation accuracy
Solution Approach 2:
Reference signals serve as intermediaries between the transmitted signal and the receiver's decoding process. These dedicated reference signals carry frequency offset information that can be extracted without processing the entire data signal, enabling efficient and accurate frequency offset estimation with minimal processing overhead
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach improves signal decoding accuracy and reduces the installation burden by optimizing the function split between DU and RU, thereby enhancing communication performance and reducing costs in high-speed environments.
Implementation Method 1
based on phase information of the plurality of reference signals, identifying a first frequency offset
Data Source
AI summary
A method performed by a distributed unit (DU) is provided. The method includes obtaining uplink data and a plurality of reference signals in a time interval from a radio unit (RU), based on phase information about the plurality of reference signals, identifying a first frequency offset, based on the first frequency offset, performing initial decoding for the uplink data, in response to a failure of the initial decoding, based on the first frequency offset and a reference value, identifying a second frequency offset, and based on the second frequency offset, performing additional decoding of the uplink data, wherein the reference value is identified based on a time difference between the plurality of reference signals in the time interval.