Dynamic Feedback Beam Selection for Type II CSI Overhead Reduction
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Solution Overview
Problem
The existing Type II CSI feedback in wireless communication systems faces challenges in efficiently managing overhead as the number of layers exceeds 2, leading to increased overhead and potential performance losses due to insufficient resource allocation and discarding of narrow-band coefficients.
Innovation Solution
A method where the number of feedback beams is dynamically selected based on the number of layers fed back, allowing for selective feedback of important layers and coefficients, thereby optimizing the balance between performance and overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of layers exceeds 2 and the number of beams exceeds 4, then the channel state information feedback accuracy is improved, but the feedback overhead increases significantly
Solution Approach 1:
The patent applies dynamics by making the number of feedback beams variable rather than fixed. The base station dynamically determines the number of beams to feedback based on the number of layers being fed back, allowing the system to adapt to different channel conditions and optimize the balance between accuracy and overhead.
Solution Approach 2:
The patent changes the parameter of feedback configuration by introducing a variable number of beams that depends on the number of layers. This parameter change allows the system to adjust the feedback granularity dynamically, reducing overhead when fewer layers are needed while maintaining accuracy when more layers are present.
2Reliability
If all layers on one sub-band and narrow-band coefficients on all beams are fed back together, then the feedback completeness is maintained, but the overhead management becomes inefficient
Solution Approach 1:
The patent segments the feedback process by separating the selection of layers from the selection of beams. Instead of feedback all layers and beams together as a single unit, the system independently determines how many layers to feedback and how many beams to feedback, allowing for more efficient overhead management while maintaining completeness.
Solution Approach 2:
The patent applies partial action by allowing the system to feedback only the necessary number of layers and beams rather than all possible combinations. The base station determines the appropriate number of beams based on the number of layers, enabling partial feedback that is sufficient for the given channel conditions without wasting resources on unnecessary feedback.
3Device complexity
If the number of feedback beams is fixed, then the feedback configuration is simple, but the adaptability to different channel conditions is reduced
Solution Approach 1:
The patent transforms the fixed feedback configuration into a dynamic one where the number of beams is determined based on the number of layers. This dynamic adjustment allows the system to adapt to varying channel conditions while maintaining relatively simple configuration mechanisms through standardized determination rules.
Data Source
AI summary
The present disclosure discloses a method and device for wireless communication in a user equipment and base station. The user equipment receives first information and sends first radio signal. The first radio signal carries a first bit block, the first bit block being used to determine R, L first vectors and R second type parameter group(s); the R is used to determine the L from P candidate integers; the first information is used to determine the P candidate integers; each second type parameter group of the R second type parameter group(s) comprises L2 second type parameters, the L2 being equal to the L multiplied by 2; R3 second type parameter group(s) in the R second type parameter group(s) is(are) respectively used with the L first vectors to generate R3 merge vector(s); the P is a positive integer greater than 1; the R (greater than R3) and R3 are positive integers.