Adaptive SRS Configuration for Massive MIMO Channel Estimation
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Solution Overview
Problem
Existing SRS configuration solutions primarily designed for obtaining effective channel information fail to support base stations in acquiring complete channel information necessary for dynamic analog precoding in massive MIMO systems, leading to increased costs and processing complexity.
Innovation Solution
A method to configure SRS subframe configuration parameters based on user equipment movement speed, allowing adaptive adjustment of SRS density to obtain complete channel information, reducing resource waste and improving channel estimation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional SRS configuration is used to obtain effective channel information, then channel estimation accuracy is improved, but the base station cannot obtain complete channel information required for dynamic analog precoding
Solution Approach 1:
The patent applies dynamics by making the SRS configuration adaptive to UE movement speed. The base station determines UE movement speed and selects appropriate SRS subframe configuration parameters dynamically, allowing the system to adjust SRS density based on channel conditions. This enables obtaining complete channel information for dynamic analog precoding while maintaining measurement precision.
Solution Approach 2:
The patent changes SRS configuration parameters (subframe offset, periodicity) based on UE movement speed. By adjusting these parameters dynamically, the system can configure SRS resources appropriately to capture complete channel information including long-term statistics, resolving the contradiction between effective channel information and complete channel information requirements.
2Measurement precision
If digital beamforming is used with massive transmit antennas, then downlink channel information accuracy is improved, but base station costs and baseband processing complexity increase
Solution Approach 1:
The patent segments the beamforming function into two levels: first-level dynamic analog beamforming using phase shifters to change antenna downtilt, and second-level digital beamforming using baseband processing. This segmentation reduces baseband processing complexity while maintaining channel information accuracy, as the analog layer handles spatial dimension reduction.
Solution Approach 2:
The patent introduces hybrid beamforming as an intermediary between pure digital and pure analog beamforming. The first-level analog beamforming acts as a mediator that performs spatial dimension reduction, reducing the burden on baseband processing while the second-level digital beamforming maintains scheduling and interference suppression capabilities.
3Loss of information
If SRS density is increased to obtain complete channel information, then channel information completeness is improved, but SRS resource waste increases
Solution Approach 1:
The patent makes SRS density dynamic by adjusting it according to UE movement speed. For slow-moving UEs, lower SRS density is used to reduce resource waste, while for fast-moving UEs, higher density is used to capture complete channel information. This dynamic adjustment resolves the contradiction between information completeness and resource efficiency.
Solution Approach 2:
The patent changes SRS configuration parameters (periodicity, subframe offset) based on UE movement speed to optimize resource usage. By adapting these parameters to channel conditions, the system achieves complete channel information acquisition without excessive SRS resource consumption.
Data Source
AI summary
Embodiments of the present application disclose a sounding reference signal configuration method and an apparatus. The method includes: determining, by a base station, a movement speed of user equipment UE; determining, by the base station based on the movement speed of the UE, a UE-specific subframe configuration set in a plurality of UE-specific SRS subframe configuration sets corresponding to a used cell-specific SRS subframe configuration set, and determining a UE-specific SRS subframe configuration parameter in the determined UE-specific subframe configuration set, where the UE-specific SRS subframe configuration parameter is used to indicate a subframe used to send an SRS; and sending, by the base station, the UE-specific SRS subframe configuration parameter and identification information of the UE-specific subframe configuration set to the UE.