Reduced Complexity UE for Downlink MIMO Channel Estimation
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Solution Overview
Problem
The complexity of processing and overhead associated with determining downlink channel qualities in user equipment (UE) with a large number of RF chains, particularly in multi-layer reception scenarios, pose a challenge in efficiently supporting downlink MIMO operations.
Innovation Solution
Implementing a reduced complexity UE by logically grouping RF channels, allowing CSI-RS or SRS to be processed based on these groupings rather than individual receive chains, and configuring the UE to report codeword-to-layer mappings or determine SRS resource groupings to facilitate downlink channel estimations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If downlink channel quality determination is performed for each individual receive chain in multi-layer reception, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the receive chains into multiple groups, where each group is associated with a specific downlink channel. Instead of processing each receive chain individually, the system performs channel quality determination at the group level, reducing the number of processing operations while maintaining adequate measurement precision through representative measurements within each group.
Solution Approach 2:
The patent merges multiple receive chains into groups that share common downlink channels. By combining the processing of individual receive chains into group-level operations, the system reduces overall processing complexity while still capturing the essential channel characteristics needed for accurate quality determination.
2Reliability
If downlink channel quality determination is performed for each individual receive chain, then reliability is improved, but loss of time increases
Solution Approach 1:
By segmenting receive chains into groups associated with specific downlink channels, the patent enables parallel processing of channel quality determinations across different groups. This segmentation allows the system to maintain reliable channel quality assessment while reducing the sequential processing time required.
Solution Approach 2:
The patent establishes group associations between receive chains and downlink channels in advance, creating a predefined mapping structure. This preliminary organization enables more efficient real-time channel quality determination by eliminating the need for dynamic individual chain processing during operation.
3Measurement precision
If individual receive chain processing is used for downlink channel estimation, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent divides receive chains into discrete groups, each associated with specific downlink channels. This segmentation allows channel estimation to be performed at the group level using representative measurements, maintaining adequate estimation precision while significantly reducing the computational complexity compared to individual chain processing.
Solution Approach 2:
The patent creates a universal grouping structure where groups of receive chains can be associated with downlink channels in a consistent manner. This universal approach enables the system to handle multiple channels and receive chains through a standardized group-based processing framework, reducing complexity while maintaining estimation accuracy.
Data Source
AI summary
The present application relates to a reduced complexity UE. In an example, the UE includes multiple receive ports to support downlink multiple input multiple output (MIMO) operations. This set can be six or more to support six or more layers for the downlink MIMO operations. A first set of the receive ports are logically grouped in a first group, and a second set of the receive ports are logically grouped in a second group. A channel state information (CSI) sent by the UE to a base station can indicate the mapping of the layers (or the receive ports) to codewords that the base station is to send to the UE. Additionally, or alternatively, an SRS transmission by the UE is associated with a particular group of the receive ports.