UE Time Correlation Reporting With Selective Lag Feedback
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Solution Overview
Problem
In wireless communications systems, user equipment (UE) faces challenges in performing time correlation reporting for multiple lags of reference signals (RS) due to discontinuous reception (DRX) configurations, leading to uncertainty in how to behave when certain lags are unobtainable, which affects downlink precoding and overall system performance.
Innovation Solution
The UE is enabled to perform lag-selective time correlation reporting by measuring and reporting time correlation for a subset of configured lags, providing clarity on behavior when certain lags are unobtainable, thereby improving feedback and optimizing downlink precoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE is configured to report time correlation for multiple lags of reference signals, then the downlink precoding performance is improved, but the complexity of the reporting mechanism increases and uncertainty arises when certain lags are unobtainable due to DRX configurations
Solution Approach 1:
The patent applies partial action by allowing the UE to report time correlation for only a subset of the configured lags. When certain lags are unobtainable due to DRX configurations, the UE selectively reports only those lags for which measurements are available, rather than requiring complete reporting for all configured lags. This resolves the contradiction by maintaining performance improvement from multi-lag reporting while reducing complexity and uncertainty through selective reporting.
Solution Approach 2:
The patent changes the reporting parameter from a fixed requirement to report all configured lags to a flexible mechanism where the UE reports only obtainable lags. The network entity receives and processes variable subsets of lag reports based on UE capability and DRX configuration, transforming the rigid reporting structure into an adaptive one that balances performance and complexity.
2Loss of information
If the UE reports time correlation for all configured lags, then complete feedback information is provided, but power consumption increases and reporting becomes infeasible when lags are unobtainable due to DRX
Solution Approach 1:
The patent implements partial action by having the UE report only the subset of lags for which time correlation measurements are obtainable, rather than requiring reporting for all configured lags. This approach maintains sufficient feedback information for effective downlink precoding while significantly reducing power consumption by avoiding measurements and reports for unobtainable lags, especially those affected by DRX configurations.
Solution Approach 2:
The patent extracts and reports only the relevant obtainable lags from the full set of configured lags. By separating obtainable lags from unobtainable ones and reporting only the former, the system maintains essential feedback information while eliminating unnecessary power consumption associated with attempting to measure and report unobtainable lags.
3Productivity
If the UE measures time correlation for multiple lags, then the system performance is improved, but the measurement overhead and processing complexity increase
Solution Approach 1:
The patent applies partial action by measuring and reporting time correlation only for obtainable lags rather than all configured lags. This selective measurement approach maintains system performance improvement from multi-lag time correlation reporting while reducing measurement overhead and processing complexity by focusing resources only on feasible measurements.
Solution Approach 2:
The patent changes the measurement parameter from a fixed set of all configured lags to a dynamic subset of obtainable lags. The UE adapts its measurement behavior based on DRX configurations and availability, transforming the measurement process from a static high-complexity operation to a flexible lower-complexity operation that maintains performance benefits.
Data Source
AI summary
Certain aspects of the present disclosure provide a method for wireless communications at a user equipment (UE), generally including receiving signaling configuring the UE to report time correlation for multiple lags of reference signals (RS), wherein each lag represents a separation in time between reference signals measured for time correlation and reporting time correlation for a subset of the multiple configured lags.