CSI Reporting of Coherence Bandwidth for Fast-Fading Detection
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Solution Overview
Problem
Existing wireless communication systems lack the ability to effectively detect and respond to fast fading errors due to insufficient measurement and reporting of coherence bandwidth metrics, limiting the identification of poor channel performance and hindering effective response strategies.
Innovation Solution
Modifying radio resource control (RRC) configuration signaling to include coherence bandwidth metrics in channel state information (CSI) reporting, enabling user equipment (UE) to measure and report reference signal receive power (RSRP) within and outside the coherence bandwidth of the bandwidth part (BWP), allowing for identification of fast frequency fading issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coherence bandwidth metrics are added to CSI reporting, then fast fading detection capability is improved, but signaling complexity increases
Solution Approach 1:
The patent segments the bandwidth part into multiple resource block groups and measures coherence bandwidth metrics for each segment separately. This allows the system to identify specific frequency regions affected by fast fading while maintaining overall communication quality, resolving the contradiction between detection capability and signaling complexity.
Solution Approach 2:
The patent applies local quality by measuring and reporting coherence bandwidth metrics specifically for resource block groups experiencing poor channel performance, rather than uniformly across the entire bandwidth. This targeted approach improves fast fading detection where needed without unnecessarily increasing signaling complexity across the entire system.
2Measurement precision
If coherence bandwidth metrics are measured and reported, then channel performance identification is improved, but measurement and processing overhead increases
Solution Approach 1:
The patent applies partial action by measuring coherence bandwidth metrics only for resource block groups that exhibit poor channel performance or are suspected of experiencing fast fading, rather than measuring all resource block groups uniformly. This selective measurement approach improves channel performance identification precision while reducing overall measurement and processing overhead.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a configuration signal identifying reference signal resources for a channel measurement procedure performed on a multi-band channel, the configuration signal further identifying parameters of a feedback message associated with the channel measurement procedure, the parameters comprising a set of coherence bandwidth metrics for the multi-band channel that are to be indicated in the feedback message. The UE may perform the channel measurement procedure using the reference signal resources to identify the set of coherence bandwidth metrics for the multi-band channel. The UE may transmit the feedback message indicating the set of coherence bandwidth metrics.