Codebook Feedback Method Antenna Port Grouping
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Solution Overview
Problem
The complexity of codebook design in communication systems due to the large number of antenna ports associated with cell-specific reference signals (CRS) leads to increased overhead and complexity in feedback processes.
Innovation Solution
Grouping antenna ports into multiple groups, allowing for reduced feedback complexity by using second-type reference signals to select target antenna port groups, which simplifies the codebook design and reduces signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If antenna ports are not grouped and all CRS antenna ports are used for codebook feedback, then channel estimation accuracy is improved, but codebook design complexity increases
Solution Approach 1:
The patent divides antenna ports into multiple groups (first antenna port group and second antenna port group) and assigns different reference signals to each group. This segmentation allows the system to maintain accurate channel estimation for all antenna ports while reducing codebook design complexity by working with smaller, grouped subsets rather than all antenna ports simultaneously.
2Device complexity
If antenna ports are grouped into multiple groups, then codebook design complexity is reduced, but feedback information quantity increases
Solution Approach 1:
The patent extracts and removes redundant feedback information by using different reference signals for different antenna port groups. Instead of requiring full codebook feedback for all antenna ports, the system only requires PMI feedback for the selected antenna port group, thereby reducing the quantity of feedback information while maintaining codebook design simplicity.
3Manufacturing precision
If a full codebook set is designed for all antenna ports, then precoding accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent segments the codebook design into multiple smaller codebook sets corresponding to different antenna port groups. This segmentation maintains precoding accuracy for the active antenna ports while reducing signaling overhead by only transmitting PMI information for the selected group rather than the entire codebook set.
Data Source
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AI summary
This application relates to the communications field, and discloses a codebook feedback method and an apparatus, so as to reduce codebook design complexity. In the technical solution, antenna ports corresponding to first-type reference signals of a cell in which UE is located are grouped into at least two antenna port groups, and each antenna port group includes at least one antenna port; and the method includes: receiving, by the UE, a first-type reference signal that is corresponding to a target antenna port group and that is sent by a base station, where the target antenna port group is an antenna port group in the at least two antenna port groups; obtaining, by the UE, precoding matrix indicator PMI information of the first-type reference signal corresponding to the target antenna port group; and sending, by the UE, the PMI information to the base station. The technical solution may be applied to a codebook feedback scenario.