UE SRS Precoding via PRB Bundles for Channel Estimation
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Solution Overview
Problem
Current communication systems face inefficiencies in channel estimation due to the need for User Equipment (UE) to receive Precoding Matrix Indicators (PMI) and SRS configuration information before transmitting Sounding Reference Signals (SRS), leading to lower channel estimation performance.
Innovation Solution
The UE determines and applies the same precoding across PRB bundles, allowing the base station to perform channel estimation using PRB bundles as units, thereby improving channel estimation performance and reducing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE receives PMI and SRS configuration information from the base station before transmitting SRS, then the channel estimation can be performed, but the signaling overhead increases and channel estimation performance deteriorates
Solution Approach 1:
The patent extracts the PMI reception step from the traditional SRS transmission process. The UE no longer needs to receive PMI from the base station before transmitting SRS, eliminating the signaling overhead associated with PMI transmission while maintaining channel estimation capability through direct SRS transmission on bundled PRBs
Solution Approach 2:
The patent combines multiple PRBs into PRB bundles for SRS transmission. By bundling multiple PRBs and transmitting SRS across them with the same precoding, the system improves channel estimation performance through aggregated measurements while reducing the number of separate configuration signals needed
2Measurement precision
If the base station performs channel estimation in a PRB by PRB manner, then the channel estimation can be performed, but the channel estimation performance is lower
Solution Approach 1:
The patent segments the frequency spectrum into PRB bundles rather than treating each PRB independently. This segmentation into larger bundled units allows the base station to perform channel estimation across multiple PRBs simultaneously, improving measurement precision while simplifying the estimation process compared to individual PRB analysis
Solution Approach 2:
The patent changes the granularity parameter of channel estimation from PRB-level to PRB-bundle-level. By adjusting this parameter, the system achieves better channel estimation performance through aggregated measurements across multiple PRBs while reducing computational complexity
3Adaptability or versatility
If the UE uses different precoding for different PRBs, then the uplink transmission flexibility is improved, but the channel estimation performance deteriorates
Solution Approach 1:
The patent applies local quality by using the same precoding across all PRBs within a bundle. This localized uniformity in precoding application within each bundle enables coherent channel estimation across the bundled PRBs, improving measurement precision while maintaining overall system flexibility through bundle-level precoding selection
Data Source
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AI summary
Provided in the embodiments of the present disclosure are methods for transmitting and receiving an SRS, and related devices. The method includes: receiving indication information transmitted by a base station and used to indicate a PRB bundling size; and transmitting, within at least one PRB bundle, the SRS to the base station, wherein the number of PRBs included in the at least one PRB bundle is equal to the PRB bundling size, and a same precoding is used by PRBs belonging to a same PRB bundle, and the precoding is determined by the UE itself.