Single-Antenna Panel Codebook for 128-Port Beam Selection
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately selecting beams and reporting channel state information (CSI) due to limitations in codebook-based signaling, particularly with single antenna panel configurations, which are inadequate for supporting more than 32 CSI-RS antenna ports and multiple layers.
Innovation Solution
Enhancements to the Type 1 codebook are introduced to support up to 128 CSI-RS antenna ports and extend beam selection to 3 and 4 layers, incorporating unified codebook designs and dynamic beam width adjustments in both vertical and horizontal dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing codebook-based signaling is used, then device complexity is reduced, but beam selection accuracy and support for multiple layers deteriorates
Solution Approach 1:
The codebook is segmented into multiple types (Type 1 and Type 2) with different structures optimized for specific scenarios. Type 1 codebook uses a unified structure for all layers, while Type 2 codebook uses separate structures for different layer groups, allowing the system to select the appropriate codebook type based on the number of layers and antenna ports, thereby improving beam selection accuracy without universally increasing complexity
Solution Approach 2:
The patent extends the codebook design from 2D (horizontal only) to 3D by incorporating both horizontal and vertical beam dimensions. This is achieved by introducing vertical beam indices and extending the codebook structure to support multi-dimensional beam selection, which improves beam selection accuracy for multi-layer transmissions while maintaining manageable complexity through systematic indexing
2Measurement precision
If codebook supports more antenna ports and layers, then channel state information reporting precision improves, but codebook structure complexity increases
Solution Approach 1:
The Type 1 codebook is designed with a unified structure that can universally support up to 8 layers and 128 antenna ports through a single codebook configuration. This universal design allows the same codebook structure to handle different numbers of layers and antenna ports without requiring multiple specialized codebooks, thereby improving CSI reporting precision while controlling structure complexity through reuse
Solution Approach 2:
The codebook design dynamically adapts to different transmission scenarios by allowing configuration of codebook type (Type 1 or Type 2) based on the number of layers and antenna ports. The system can switch between unified codebook structure (Type 1) for up to 8 layers and separate codebook structure (Type 2) for specific scenarios, enabling dynamic optimization of CSI reporting precision while managing codebook structure complexity
3Adaptability or versatility
If unified codebook design is used for all layers, then device complexity is reduced, but adaptability to different layer configurations deteriorates
Solution Approach 1:
The codebook is segmented into Type 1 (unified structure) and Type 2 (separate structures) to handle different layer configurations. Type 1 uses a single codebook for all layers with unified indexing, while Type 2 separates codebooks for different layer groups (e.g., layers 1-2 and layers 3-4), allowing the system to select the appropriate type based on the number of layers, thereby improving adaptability while controlling design complexity through structured segmentation
Solution Approach 2:
The patent employs a composite codebook approach where Type 1 and Type 2 codebooks are combined into a unified framework. The system can composite different codebook types based on transmission requirements, allowing flexible adaptation to different layer configurations while maintaining manageable design complexity through a standardized interface and selection mechanism
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may support codebook-based signaling in order to perform accurate beam selection and reliable communications as device capabilities advance. The UE may receive, from a network entity, a set of channel state information reference signals (CSI-RSs) associated with a plurality of CSI-RS antenna ports located at the network entity. The UE may perform one or more measurements using the CSI-RSs and may generate a CSI report according to a first type of codebook (such as a Type 1 single antenna panel codebook). The CSI report may include an indication of a set of one or more beams associated with a precoding matrix, where the indication of the set of one or more beams is based on a rank indicator being greater than at least two layers. The UE may then transmit the CSI report to the network entity.