CSI Feedback Control via Trigger Signaling for Large-Scale Antennas
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Solution Overview
Problem
Existing communication systems lack a solution for efficiently feeding back channel state information (CSI) in large-scale antenna systems, leading to high complexity for user equipment (UE) and limited flexibility for network control.
Innovation Solution
A method and device that allow a base station to control the feedback of CSI by transmitting trigger signaling to the UE, indicating whether to feed back a first PMI and/or a second PMI, enabling the UE to feed back only a part of the CSI, thus reducing complexity and improving network flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE feeds back all CSI (first PMI and second PMI) in large-scale antenna systems, then the channel state information accuracy is improved, but the computational complexity and feedback overhead increase significantly
Solution Approach 1:
The patent segments the PMI feedback into two separate parts: first PMI (for long-term channel statistics) and second PMI (for short-term channel state). The base station can independently trigger feedback of first PMI, second PMI, or both, allowing the UE to compute and feedback only the required portion rather than all CSI parameters, thus reducing computational complexity while maintaining accuracy where needed
Solution Approach 2:
The patent implements partial feedback action by allowing the base station to trigger only specific PMI feedback based on current channel conditions and scheduling requirements. When channel conditions are stable, only first PMI feedback is triggered; when rapid changes occur, second PMI feedback is triggered. This partial action approach reduces the overall feedback burden while maintaining necessary accuracy
2Loss of information
If the UE feeds back all CSI parameters, then the network obtains complete channel information, but the feedback overhead and signaling resources increase
Solution Approach 1:
The feedback mechanism is segmented into independent first PMI and second PMI feedback channels. The base station can selectively trigger feedback of first PMI only, second PMI only, or both together, allowing flexible control of feedback overhead based on actual network needs while ensuring complete channel information is available when required
Solution Approach 2:
The patent implements periodic feedback triggers where the base station sends trigger signals at specific intervals or based on channel condition changes. The UE responds by feeding back the appropriate PMI information periodically or event-driven, reducing continuous feedback overhead while maintaining information completeness through timely updates
3Adaptability or versatility
If the network requires flexible control over CSI feedback timing and content, then scheduling flexibility is improved, but the control signaling complexity increases
Solution Approach 1:
The control mechanism is segmented into separate trigger bits for first PMI feedback and second PMI feedback. This segmentation allows the base station to independently control when each type of PMI feedback is required, providing fine-grained flexibility in scheduling while keeping the control signaling structure simple and manageable through bit-level control
Data Source
AI summary
Disclosed are a channel state information feedback and a control method and device therefor, which are used for realizing large-scale CSI feedback under an antenna system, wherein a UE may only need to feedback some pieces of PMI information, so that the complexity of the UE feeding back CSI is reduced, and the flexibility for a network side to control the UE to feed back the CSI is better. The channel state information (CSI) feedback control method provided in the present application comprises: a base station determining that there is a need to control a user equipment (UE) to feed back CSI, the CSI at least comprising a first precoding matrix indicator (PMI) and a second PMI, the first PMI and the second PMI corresponding to the same precoding matrix; and the base station sending trigger signaling of CSI feedback to the UE, wherein indication information used for instructing whether the UE feeds back the first PMI and/or the second PMI is comprised.