Base Station Multi-User Pairing via Channel Prediction
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Solution Overview
Problem
The receiving performance of user equipment (UE) deteriorates when it moves due to inconsistent downlink channel information, leading to reduced beamforming accuracy and increased interference in multi-user pairing systems.
Innovation Solution
A method and apparatus for multi-user pairing that predicts the downlink channel parameter of a UE by calculating a correlation coefficient between actual channel parameters at different time instances, allowing for accurate pairing even when the UE is moving, by using the predicted parameter to correct beamforming weights and improve channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the base station uses periodic pilot information from UE to obtain downlink channel parameters, then the system operation is simplified, but the downlink channel information becomes inconsistent when UE moves, deteriorating receiving performance
Solution Approach 1:
The base station performs channel prediction in advance to estimate the downlink channel parameter at the sending moment before actual transmission occurs. By calculating the correlation coefficient between current and historical channel parameters, the system proactively compensates for channel changes due to UE movement, ensuring accurate beamforming weights are prepared beforehand.
Solution Approach 2:
The system uses historical downlink channel parameters as feedback to continuously update and refine the predicted channel parameter. The correlation coefficient calculation incorporates past channel states to adapt to changing channel conditions, creating a feedback loop that maintains accuracy even as the UE moves through different locations.
2Device complexity
If the base station uses outdated downlink channel parameters for beamforming, then computational complexity is reduced, but beamforming accuracy deteriorates, increasing interference to other UEs
Solution Approach 1:
The system dynamically changes the downlink channel parameter from a static historical value to a dynamically predicted value that adapts to current channel conditions. By calculating the correlation coefficient and using it to predict the channel parameter at the sending moment, the system maintains measurement precision without requiring complex real-time channel estimation for each transmission.
3Quantity of substance
If the UE sends pilot information less frequently to save resources, then resource consumption is reduced, but the downlink channel parameter becomes outdated faster when UE moves, reducing receiving performance
Solution Approach 1:
The correlation coefficient calculation acts as an intermediary that bridges the gap between infrequent pilot information and the need for accurate channel parameters. By using historical channel parameters as intermediaries in the prediction process, the system can maintain accurate beamforming weights even when UE sends pilot information less frequently, effectively mediating between resource constraints and performance requirements.
Data Source
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AI summary
Embodiments of this application disclose a multi-user pairing method and apparatus, and a base station. The method includes: obtaining an actual downlink channel parameter of user equipment UE at a moment t0; calculating a correlation coefficient between the actual downlink channel parameter at the moment t0 and an actual downlink channel parameter of the UE at a moment t0-Δt; determining a predicted downlink channel parameter of the UE at a moment t1 if the correlation coefficient is less than a preset threshold; and performing a multi-user pairing operation based on the predicted downlink channel parameter at the moment t1. It can be learned that in the embodiments of this application, even if UE in coverage of the base station moves, the base station can still determine a relatively accurate downlink channel of the moving UE, thereby improving accuracy of a pairing parameter of the moving UE and improving receiving performance of the moving UE.