CSI Feedback Configuration via Higher Layer Signaling
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Solution Overview
Problem
Current methods lack an effective solution for configuring terminal-side CSI feedback required by the base station, particularly in managing multiple CSI-RS resources and interference assumptions, which complicates channel measurement and interference measurement aggregation feedback.
Innovation Solution
The method involves the base station using higher layer signaling to notify the terminal of CSI-RS resources and candidate configuration sets, employing bitmaps to instruct CSI feedback, and dynamically triggering CSI feedback through DCI formats or random access responses to enable flexible and precise CSI acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple CSI-RS resources and interference assumptions are configured for channel measurement, then channel measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the CSI feedback configuration into multiple independent CSI-RS resource configurations, each associated with specific interference assumptions. The terminal device processes each segmented configuration independently, allowing precise channel measurement for each scenario while managing complexity through modular processing. This is achieved by configuring multiple CSI report configurations, each linked to specific CSI-RS resources and interference measurement resources.
Solution Approach 2:
The patent implements dynamic CSI feedback triggering through downlink control information (DCI) that can activate or deactivate specific CSI report configurations based on current channel conditions and interference scenarios. This dynamic approach allows the system to adapt the level of measurement precision to actual needs, improving channel measurement precision when required while reducing terminal device complexity during normal operation by only processing actively triggered configurations.
2Measurement precision
If multiple CSI feedback configurations are implemented, then CSI acquisition precision is improved, but uplink feedback overhead increases
Solution Approach 1:
The patent merges multiple CSI report configurations into a unified feedback structure where the terminal device can selectively report CSI for different CSI-RS resources and interference assumptions within a single uplink transmission. This merging approach allows the system to achieve precise CSI acquisition across multiple scenarios while reducing uplink feedback overhead by consolidating reports and eliminating redundant transmissions.
Solution Approach 2:
The patent enables the terminal device to autonomously determine which CSI report configurations require feedback based on configured thresholds and current channel conditions. This self-service mechanism allows the terminal to selectively generate feedback only when necessary, improving CSI acquisition precision for critical scenarios while minimizing uplink feedback overhead by avoiding unnecessary reports.
3Adaptability or versatility
If dynamic CSI feedback triggering is used, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the base station monitors uplink CSI reports and dynamically adjusts the triggering of CSI feedback configurations based on observed channel conditions and interference patterns. This feedback loop improves system adaptability by automatically responding to changing conditions while managing base station complexity through rule-based decision-making that leverages configured thresholds and patterns rather than requiring complex real-time optimization algorithms.
Data Source
AI summary
A method for instructing CSI feedback signaling configuration and base station are provided, the method comprising: a base station side notifies a terminal side, via the first higher layer signaling of a UE-Specific, a CSI-RS resource for measuring CSI, the CSI-RS resource comprising at least one of: the time frequency position of the CSI-RS resource in a subframe, the antenna port number configuration of the CSI-RS resource, a period and a subframe offset of the CSI-RS resource, the sequence identifier of the CSI-RS resource, and the power control information of the CSI-RS resource; the base station side instructs the terminal side to feed back the CSI corresponding to the CSI-RS resource. In the present invention, the base station side flexibly configures the terminal side to feed back various kinds of CSI information, thus enabling the base station side to flexibly and dynamically acquire the CSI, and in turn realizing precise link self-adaption and data transmission, and reducing the uplink feedback overhead and measurement complexity of the terminal side.