Distributed AP RRU Selection for Uplink Decoding Accuracy
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Solution Overview
Problem
In distributed AP architectures, the deployment of RRUs over a large area results in varying channel conditions and significant delay differences between signals received by different RRUs, leading to poor decoding accuracy and positioning errors during uplink joint reception.
Innovation Solution
A method is introduced where the baseband device determines parameters of uplink signals received by multiple RRUs, selects a target set of RRUs based on signal quality and timing parameters, and shields signals from RRUs that may cause high bit error rates or large positioning errors, thereby improving decoding and positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple RRUs are deployed far apart to cover large area, then area coverage is improved, but decoding accuracy and positioning precision deteriorate due to varying channel conditions and delay differences
Solution Approach 1:
The baseband device performs preliminary evaluation of uplink signal parameters (signal strength, quality metrics, timing parameters) received from multiple RRUs before performing joint decoding or positioning calculations. This preliminary assessment allows the system to identify and select only those RRU signals that meet quality thresholds, preventing poor-quality signals from degrading decoding accuracy or positioning precision while maintaining the benefit of distributed RRU deployment for area coverage
Solution Approach 2:
The patent applies different quality thresholds and selection criteria to different RRU signals based on their individual characteristics. Each RRU's signal is evaluated independently using local quality metrics (signal strength, SNR, timing synchronization), and only signals meeting their specific quality standards are selected for joint processing. This local quality assessment ensures that each contributing signal meets appropriate standards for its deployment conditions
2Productivity
If signals from all RRUs are used for joint decoding, then network capacity is improved, but bit error rate increases due to inclusion of poor quality signals
Solution Approach 1:
The baseband device changes the parameter set used for signal selection from simply accepting all RRU signals to evaluating multiple parameters including signal strength, signal quality metrics, and timing parameters. By dynamically adjusting which signals are included in joint decoding based on these parameter evaluations, the system maintains high network capacity through multi-RRU collaboration while filtering out signals that would increase bit error rates
Solution Approach 2:
The patent extracts and removes poor-quality RRU signals from the joint decoding process while retaining high-quality signals. The baseband device identifies signals below quality thresholds and excludes them from further processing, ensuring that only reliable signals contribute to the final decoding result. This extraction of problematic signals maintains network capacity benefits while preventing reliability degradation
3Adaptability or versatility
If signals from all RRUs are used for positioning, then positioning functionality is enabled, but positioning error increases due to delay differences and channel variations
Solution Approach 1:
Before performing positioning calculations, the baseband device conducts preliminary evaluation of timing parameters and signal quality metrics from each RRU. This preliminary action identifies and selects only those RRU signals that meet timing synchronization requirements and quality thresholds, ensuring that the positioning calculation uses only reliable data sources. This enables robust positioning functionality while minimizing positioning errors from poor-quality signals
Solution Approach 2:
The patent changes the selection criteria for positioning from using all available RRU signals to using only signals that meet specific parameter thresholds including timing parameters and signal quality metrics. By dynamically adjusting which RRU signals are included in positioning based on real-time parameter evaluation, the system maintains versatile positioning functionality across distributed RRUs while minimizing positioning errors through selective signal inclusion
Data Source
AI summary
A method for determining a remote radio device and a distributed AP are provided. The method includes: A baseband device determines parameters of uplink signals received by N remote radio devices, where N is a natural number greater than 1. The baseband device selects, based on the parameters, at least one remote radio device from the N remote radio devices as a remote radio device in a target set. The baseband device performs decoding based on an uplink signal received by the remote radio device in the target set, or positions a terminal device based on an uplink signal received by the remote radio device in the target set.