Multi-Panel Codebook Feedback for Near-Field Beam Steering
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Solution Overview
Problem
Existing wireless communication systems struggle to effectively account for the characteristics of multiple antenna panels when transmitting to receivers located in the near-field range, leading to suboptimal beamforming and precoding operations.
Innovation Solution
Implementing nearfield-based channel state feedback for multi-panel codebooks, where user equipment (UE) transmits channel state information (CSI) indicating per-antenna panel precoding matrix indices (PMIs) with offsets based on angular separations, allowing network entities to steer transmissions towards the UE using multiple antenna panels with distinct beamforming directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional far-field channel state feedback is used for multi-panel transmissions, then system complexity is reduced, but transmission accuracy and beamforming performance deteriorate for near-field receivers
Solution Approach 1:
The patent segments the channel state feedback into panel-specific components, where each antenna panel has its own precoding matrix indicator (PMI) and angle parameters. This segmentation allows accurate near-field characterization per panel while maintaining modular codebook structures that manage complexity through organized subdivisions of the feedback information.
Solution Approach 2:
The patent introduces angle parameters (azimuth and elevation angles) as additional feedback parameters to characterize near-field geometry. By changing the parameter set from traditional far-field assumptions to near-field angle parameters, the system achieves accurate spatial characterization for close-proximity receivers while the codebook is designed to efficiently represent these parameters.
2Reliability
If per-antenna panel precoding with angular offsets is implemented, then beamforming accuracy for near-field devices is improved, but feedback overhead and processing complexity increase
Solution Approach 1:
The patent applies local quality by providing dedicated precoding parameters (PMI and angle offsets) for each antenna panel based on its specific spatial relationship to the near-field receiver. Each panel's feedback is optimized for its local geometric characteristics, improving beamforming accuracy while the codebook structure efficiently represents these localized parameters through compact angular offset indicators.
3Adaptability or versatility
If multi-panel codebooks with angular parameters are used, then coverage and transmission quality for near-field devices are enhanced, but computational complexity for PMI selection increases
Solution Approach 1:
The patent employs pre-computed codebooks that contain precoding matrices organized according to angular parameters and panel configurations. By performing preliminary organization of the codebook structures before runtime, the system enables efficient PMI selection through simplified search and comparison operations, reducing real-time computational complexity while maintaining comprehensive near-field coverage capability.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit channel state information to a network entity, wherein the channel state information indicates a first precoding matrix index for a first antenna panel of a set of antenna panels of the network entity and a second precoding matrix index for a second antenna panel of the set of antenna panels, and wherein the second precoding matrix index is offset from the first precoding matrix index in accordance with an angle parameter associated with an angular separation between the first antenna panel and the second antenna panel relative to the UE. The UE may receive a message from the network entity according to the channel state information.