CSI Feedback Weighting for Even UE Scheduling
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Solution Overview
Problem
In FDD communications systems, UEs at the edge of a cell often have poor channel quality, making it difficult for base stations to schedule them, resulting in suboptimal performance due to limited resource allocation and inefficient CSI feedback mechanisms.
Innovation Solution
A CSI feedback method where UEs adjust channel quality parameters using a weight parameter to determine whether to report CSI, generating an M-dimensional Gaussian random sequence for coding and feedback, allowing for dynamic resource allocation and improved scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all UEs report CSI to the base station, then the base station can make scheduling decisions based on complete information, but uplink communication resources are occupied by a large number of UEs including those with poor channel quality
Solution Approach 1:
The patent introduces a weight parameter that is multiplied with the channel quality parameter to form a channel statistic quality parameter. This parameter transformation allows UEs with poor channel quality to have their effective quality improved, enabling them to meet the threshold for CSI feedback and receive scheduling services.
2Quantity of substance
If a threshold is broadcast to reduce CSI feedback overhead, then uplink resource occupation is reduced, but UEs at cell edges with poor channel quality cannot exceed the threshold and thus cannot be scheduled
Solution Approach 1:
The patent transforms the channel quality parameter by multiplying it with a weight parameter to create a channel statistic quality parameter. This transformation enables UEs with inherently poor channel quality (like edge UEs) to achieve a transformed quality metric that exceeds the threshold, thereby enabling them to feedback CSI and receive scheduling services.
Solution Approach 2:
The weight parameter acts as an intermediary that mediates between the raw channel quality measurement and the scheduling threshold. By introducing this intermediate transformation step, the system can maintain a fixed threshold while still accommodating UEs with varying channel conditions, particularly those at cell edges.
3Productivity
If the base station schedules only UEs with good channel quality, then resource allocation efficiency is high, but UEs at the edges of the cell cannot be scheduled resulting in poor system fairness
Solution Approach 1:
The patent applies a weight parameter transformation to the channel quality metric, which effectively adjusts the perceived quality of UEs with poor channel conditions. This allows the scheduling algorithm to identify and serve edge UEs that would otherwise be excluded, thereby improving system fairness and scheduling coverage while maintaining efficient resource allocation.
Data Source
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AI summary
The present invention discloses a CSI feedback method, a UE scheduling method, UE, and a base station. The CSI feedback method includes: receiving, by UE, a reference signal broadcast by a base station; performing channel estimation on a radio channel between the base station and the UE by using the reference signal, to obtain CSI and a channel quality parameter; adjusting the channel quality parameter according to a channel quality weight parameter, to obtain a channel statistic quality parameter; and when the channel statistic quality parameter exceeds a channel quality threshold, feeding back the CSI to the base station. In the present invention, because a channel quality parameter is dynamically adjusted by using a channel quality weight parameter, and it is selected, according to a result of comparing an adjusted channel statistic quality parameter with a channel quality threshold, whether to report CSI. UEs in a system can be evenly scheduled.