CSI Delta Reporting for Multi-TRP Beam Measurement Overhead
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Solution Overview
Problem
Existing wireless communication systems face high signaling overhead and inefficiencies in channel state information (CSI) reporting due to the need for separate CSI reports for each beam and transmit-receive point (TRP), leading to increased probability of lost reports and resource wastage.
Innovation Solution
Implementing delta value reporting, where a user equipment (UE) or TRP transmits an indication of the delta between measurements of CSI-RSs associated with different beams or TRPs, reducing the need for separate CSI reports and thereby lowering signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate CSI reports are transmitted for each TRP and beam, then measurement precision is improved, but signaling overhead increases
Solution Approach 1:
The patent segments the CSI reporting by dividing it into a first CSI report for a first TRP/beam and a second CSI report for a second TRP/beam. This segmentation allows the UE to report measurements separately for different TRPs and beams, maintaining measurement precision while enabling selective reporting based on configuration and thresholds.
Solution Approach 2:
The patent implements partial reporting by only transmitting CSI reports that meet certain criteria (e.g., above a threshold, or indicating beam blocking). The UE determines whether to send a second CSI report based on comparisons with thresholds or conditions, thereby reducing unnecessary signaling overhead while maintaining adequate measurement precision when needed.
2Measurement precision
If separate CSI reports are transmitted for each TRP and beam, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the reporting process into distinct first and second CSI reports for different TRPs and beams. This segmentation simplifies the device complexity by providing a structured framework where each report follows the same format and processing rules, making the complexity manageable through modular design rather than a monolithic complex system.
Solution Approach 2:
The patent reduces device complexity by implementing conditional reporting where the UE only processes and transmits second CSI reports when specific conditions are met (threshold comparisons, beam blocking detection). This partial action approach simplifies the overall system by avoiding the need to continuously process and transmit all possible reports regardless of relevance.
3Quantity of substance
If delta values are used instead of separate CSI reports, then signaling overhead is reduced, but measurement precision may be compromised
Solution Approach 1:
The patent segments the measurement reporting into absolute measurements (first CSI report) and relative measurements (delta values in second CSI report). This segmentation allows the system to maintain measurement precision by providing absolute reference measurements while using delta values for efficient updates, thereby reducing signaling overhead without compromising overall measurement accuracy.
Solution Approach 2:
The patent uses the first CSI report as an intermediary reference that enables the second CSI report to use delta values. The first report provides the baseline absolute measurements, and the second report uses these as reference points for efficient delta encoding, thus reducing signaling overhead while maintaining precision through the reference framework.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a first transmit-receive point (TRP), a first channel state information reference signal (CSI-RS) associated with the first TRP and a first beam. The UE may receive, from the first TRP or a second TRP, a second CSI-RS associated with the first TRP or the second TRP, wherein the second CSI-RS is associated with a second beam. The UE may transmit, to the first TRP or the second TRP, an indication of a delta value between a measurement of the first CSI-RS and a measurement of the second CSI-RS. Numerous other aspects are described.