Uplink Spatial Filter for Joint Channel Estimation
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in maintaining phase continuity across physical uplink shared channels (PUSCHs) for effective joint channel estimation, leading to inefficiencies in channel demodulation and data transmission.
Innovation Solution
The implementation of a method where user equipment (UE) and base stations coordinate by using sounding reference signal (SRS) resource indicators, transmission rank indicators, and transmit precoder matrix indicators to ensure phase continuity across PUSCHs, allowing for joint channel estimation and improved data transmission through consistent spatial parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate channel estimation is performed for each PUSCH, then processing flexibility is maintained, but estimation accuracy and phase continuity deteriorate
Solution Approach 1:
The patent combines multiple PUSCH channels into a single processing unit called a PUSCH bundle. By merging the channel estimation processes of multiple PUSCHs that share the same spatial parameters, the system achieves phase continuity and improved estimation accuracy while avoiding the complexity of independent processing for each channel. The base station identifies PUSCHs with identical SRS resources, TRIs, and TPMIs, then performs unified channel estimation across the bundle.
2Productivity
If phase continuity is maintained across PUSCHs, then joint channel estimation efficiency improves, but system adaptability to different transmission configurations worsens
Solution Approach 1:
The patent segments PUSCH channels into distinct bundles based on their spatial parameter characteristics. PUSCHs are grouped together only when they share the same SRS resource, TRI, and TPMI, forming homogeneous bundles suitable for joint estimation. This segmentation approach allows the system to maintain phase continuity within each bundle while preserving the ability to handle diverse transmission configurations across different bundles, thus balancing efficiency and adaptability.
Data Source
AI summary
A base station performs joint channel estimation for a set of physical uplink shared channels (PUSCHs) with bundled DMRS from a user equipment (UE). The UE receives an indication to transmit the set of PUSCHs, each PUSCH of the set of PUSCHs comprising a corresponding DMRS from the base station. The base station transmits, and the UE receives, a sounding reference signal resource indicator for each PUSCH of the set of PUSCHs. The UE transmits the PUSCHs based on a same sounding reference single resource, the SRI for a first PUSCH of the set of PUSCHs indicating the same SRS resource.