CSI Feedback Codebook Selection for Multi-Panel Wireless Systems
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately estimating channel state information (CSI) for multiple antenna panels, particularly in advanced wireless communication systems with multiple antenna ports and polarizations.
Innovation Solution
The proposed solution involves a user equipment (UE) that receives configuration information from a base station (BS) indicating the number of antenna panels and a codebook mode. The UE then identifies the number of antenna panels and selects a suitable codebook for CSI feedback, using either a wideband inter-panel co-phase common across subbands or subband-specific inter-panel co-phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple antenna panels with multiple polarizations are used to increase system capacity, then the quantity of data transmission is improved, but the complexity of channel state information estimation increases
Solution Approach 1:
The channel state information feedback is segmented into multiple codebooks (first codebook for wideband inter-panel co-phase, second codebook for subband-specific parameters). This segmentation allows the complex estimation task to be divided into manageable components, reducing overall estimation complexity while maintaining support for multiple antenna panels and polarizations.
Solution Approach 2:
The patent introduces codebook mode parameters that change the structure of CSI reporting. By switching between different codebook modes (first mode with wideband co-phase, second mode with subband-specific co-phase), the system adapts the estimation complexity to match the actual channel conditions and system requirements.
2Measurement precision
If codebook mode selection is implemented to improve CSI reporting accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system dynamically selects between different codebook modes based on configuration information from the base station. The UE can switch between first codebook mode (wideband inter-panel co-phase) and second codebook mode (subband-specific inter-panel co-phase), allowing adaptive optimization of CSI accuracy without permanently increasing device complexity.
Solution Approach 2:
The dual-codebook structure serves multiple functions: it supports both wideband and subband-specific CSI reporting, accommodates different numbers of antenna panels, and works with various polarization configurations. This multi-functionality reduces the need for separate specialized mechanisms for each scenario.
Data Source
AI summary
A user equipment (UE) for channel state information (CSI) feedback comprises a transceiver configured to receive, from a base station (BS), configuration information for the CSI feedback, the configuration information indicating a number of antenna panels (Ng) at the BS and a codebook mode, wherein Ng>1 and each of the antenna panels comprises antenna ports with a first polarization (P1) and antenna ports with a second polarization (P2). The UE further comprises a processor operably connected to the transceiver, the processor configured to identify the number of antenna panels (Ng) at the BS, identify a codebook for the CSI feedback based on the codebook mode configured between a first codebook mode and a second codebook mode, and generate the CSI feedback using the identified codebook. The transceiver is further configured to transmit the generated CSI feedback to the BS.