Subband Channel Quality Information Reporting
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in reporting channel state information (CSI) across multiple subbands, leading to increased overhead and potential delays in link adaptation and scheduling, particularly impacting ultra-reliable low-latency communications.
Innovation Solution
A method where user equipment (UE) receives reference signals distributed across subbands and transmits a subset of CSI reports, selected based on these signals, to reduce overhead and improve communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If CSI reports for all subbands are transmitted, then channel state information completeness is improved, but communication overhead increases
Solution Approach 1:
The patent segments the frequency spectrum into multiple subbands and selectively reports CSI only for subbands that meet specific criteria (e.g., subbands with poor channel conditions or subbands configured for reporting). This segmentation approach divides the complete CSI reporting task into manageable subsets, reducing overall overhead while maintaining essential information for link adaptation and scheduling decisions.
Solution Approach 2:
The patent applies local quality by differentiating reporting requirements across different subbands based on their individual characteristics. Instead of uniform reporting across all subbands, the system configures specific subbands for CSI reporting based on factors such as channel quality, interference levels, or scheduling priorities. This ensures that critical local information is captured while avoiding redundant reporting in subbands that do not require detailed feedback.
2Loss of information
If CSI reports for all subbands are transmitted, then channel state information completeness is improved, but scheduling delay increases
Solution Approach 1:
By segmenting CSI reporting into selective subband reports rather than comprehensive full-band reporting, the patent reduces the processing and transmission time required for CSI feedback. The network can configure which subbands require reporting based on immediate scheduling needs, enabling faster decision-making for link adaptation and resource allocation while maintaining sufficient channel state information for effective scheduling.
3Measurement precision
If reference signals are transmitted on all subbands, then measurement accuracy is improved, but signal resource consumption increases
Solution Approach 1:
The patent applies local quality by configuring reference signal transmission and CSI reporting on a per-subband basis rather than uniformly across the entire bandwidth. The network can identify specific subbands that require accurate measurements (e.g., subbands with poor channel conditions, high interference, or priority traffic) and allocate reference signals only to those subbands. This approach maintains measurement accuracy where needed while significantly reducing overall signal resource consumption and enabling more efficient resource utilization across the spectrum.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a plurality of reference signals on a plurality of reference signal resources, wherein the plurality of reference signal resources span a plurality of subbands associated with the UE. The UE may determine, for the plurality of subbands, respective selected CSI reports from a set of CSI reports based at least in part on the plurality of reference signals. The UE may transmit information indicating a subset of the respective selected CSI reports. Numerous other aspects are provided.