Quasi Co-Location Reporting for Millimeter Wave Beam Accuracy
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Solution Overview
Problem
In millimeter wave frequency regimes, existing wireless communication systems face challenges in accurately characterizing relationships between reference signals and bandwidth parts, leading to inappropriate beam characteristics and signal degradation due to the lack of granular QCL mappings.
Innovation Solution
Implementing quasi co-location (QCL) reporting to indicate specific relationships between reference signals and identified bandwidth parts, allowing for more precise beam characteristic selection and improved signal quality, while reducing network overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing wireless communication systems use traditional QCL mappings, then system complexity is reduced, but signal quality and beam characteristic accuracy deteriorate in millimeter wave frequency regimes
Solution Approach 1:
The patent segments the QCL mapping by introducing granularity through bandwidth part (BWP) associations. Instead of a single coarse-grained QCL mapping for the entire carrier, the system now supports multiple fine-grained QCL mappings, each associated with specific BWPs. This segmentation allows precise beam characteristic selection for different frequency ranges within the carrier, improving measurement precision while managing complexity through structured organization.
Solution Approach 2:
The patent applies local quality by enabling different QCL relationships to be applied to different BWPs within the same carrier. Each BWP can have its own specific QCL mapping tailored to its frequency characteristics, allowing the system to optimize beam characteristics locally for each bandwidth part rather than using a one-size-fits-all approach. This resolves the contradiction by improving local accuracy without requiring complete system-wide complexity.
2Reliability
If high-granularity QCL reporting is implemented, then signal quality improves, but network overhead increases
Solution Approach 1:
The patent implements partial action by reporting QCL relationships selectively rather than exhaustively. The UE reports QCL information only for BWPs that require specific beam characteristics, and the base station can request additional QCL mappings only when needed based on the reported information and current communication conditions. This approach maintains high signal quality where necessary while avoiding unnecessary overhead for all possible mappings.
Solution Approach 2:
The patent establishes a feedback mechanism where the base station receives QCL reports from the UE and can determine whether additional QCL mappings are needed. The base station uses the reported information to make intelligent decisions about whether to request further QCL relationships, creating a feedback loop that balances signal quality requirements with network overhead constraints. This resolves the contradiction by making overhead proportional to actual needs rather than fixed at maximum levels.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive a quasi co-location (QCL) reporting configuration that indicates a number of QCL relationships to report; and transmit a QCL report based at least in part on the QCL reporting configuration, wherein the QCL report indicates a QCL relationship between a single reference signal and a plurality of identified bandwidth parts (BWPs), or a plurality of QCL relationships between a plurality of reference signals and the plurality of identified BWPs, wherein the plurality of identified BWPs are part of a millimeter wave frequency regime. Numerous other aspects are provided.