Uplink Subband Precoding With SRS Frequency-Domain Bases
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Solution Overview
Problem
Existing wireless communication technologies, such as LTE and NR, face challenges in optimizing uplink transmission efficiency, particularly in managing interference and improving spectral efficiency in heterogeneous networks with diverse cell types and user equipment configurations.
Innovation Solution
Implementing subband level precoding techniques using sounding reference signals (SRS) to determine optimal SRS ports and linear combination coefficients, enabling improved physical uplink shared channel (PUSCH) transmission through UE and network entity coordination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional wideband precoding is used for uplink transmission, then device complexity is reduced, but spectral efficiency and interference management deteriorate
Solution Approach 1:
The patent divides the uplink transmission bandwidth into multiple subbands, allowing independent precoding optimization for each subband. This segmentation enables the system to achieve frequency-selective precoding gains while maintaining manageable complexity through structured codebook designs and SRS-based channel estimation.
Solution Approach 2:
The patent employs sounding reference signals (SRS) transmitted before actual data transmission to pre-estimate channel conditions across different subbands. This preliminary channel characterization allows the network to determine optimal precoding matrices in advance, enabling efficient subband-level precoding without real-time computational overhead during data transmission.
2Object-affected harmful factors
If subband level precoding is implemented, then interference management improves, but device complexity increases
Solution Approach 1:
The patent applies different precoding strategies tailored to each subband's specific channel conditions. By allowing each subband to have its own precoding matrix selected from appropriate codebooks, the system optimizes local performance in terms of interference management while maintaining overall system coherence through unified resource allocation.
Solution Approach 2:
The patent changes the precoding parameters (precoding matrices and ports) dynamically across different subbands based on channel conditions. This parameter variation enables the system to adapt to frequency-selective fading and interference patterns, achieving better interference management through frequency-domain diversity.
3Productivity
If frequency domain bases are used for SRS precoding, then uplink transmission efficiency improves, but measurement precision requirements increase
Solution Approach 1:
The patent employs dynamic selection of frequency domain bases and corresponding precoding matrices based on measured channel conditions. The system adapts the precoding configuration across different subbands according to the estimated channel state, allowing efficient exploitation of frequency-selective characteristics while managing measurement requirements through structured codebook designs.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for using subband precoding for uplink transmissions. In some cases, a UE may receive, from a network entity, information indicating one or more of sounding reference signal (SRS) ports selected by the network entity and associated linear combination coefficients, determine subband precoding based at least in part on the selected SRS ports and linear combination coefficient, and transmit a physical uplink shared channel (PUSCH) with the subband precoding.