CSI-RS Power Offset for UE-to-UE CLI Measurement
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately measuring and reporting UE-to-UE crosslink interference (CLI) due to the need for differentiated configuration of channel-state information reference signals (CSI-RS) for radio resource management (RRM) testing, which is not effectively addressed by existing technologies.
Innovation Solution
The configuration of CSI-RS for tracking involves setting power levels, periodicity, or bandwidth to distinct values compared to other RRM reference signals, allowing for precise measurement and reporting of UE-to-UE CLI, including setting a power level of CSI-RS to a value smaller than RRM reference signals, or configuring a negative power offset for synchronization signals, enabling effective RRM testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CSI-RS power level is set to a smaller value than RRM reference signals, then measurement precision for UE-to-UE CLI is improved, but signal strength for tracking is reduced
Solution Approach 1:
The patent divides the reference signal into two distinct types with different power levels: RRM reference signals (higher power) for measurement and CSI-RS for tracking (lower power). This segmentation allows each signal type to be optimized for its specific function, resolving the contradiction between measurement precision and signal strength.
Solution Approach 2:
Different parts of the reference signal configuration have different quality characteristics. The RRM reference signals use higher power levels suitable for measurement, while the CSI-RS for tracking uses lower power levels suitable for tracking purposes. This local differentiation of signal quality allows simultaneous optimization for both measurement precision and tracking reliability.
2Measurement precision
If CSI-RS periodicity is set to a longer value than RRM reference signals, then measurement precision for UE-to-UE CLI is improved, but tracking responsiveness is reduced
Solution Approach 1:
The patent segments the periodicity configuration by assigning different periodicity values to different signal types. RRM reference signals use shorter periodicity for responsive tracking, while CSI-RS for tracking uses longer periodicity optimized for measurement precision. This segmentation resolves the contradiction between measurement precision and tracking responsiveness.
3Device complexity
If CSI-RS bandwidth is set to equal RRM reference signal bandwidth, then device complexity is reduced, but measurement precision for UE-to-UE CLI is reduced
Solution Approach 1:
The patent applies local quality differentiation by configuring CSI-RS with the same bandwidth as RRM reference signals for tracking purposes, while maintaining separate power level and periodicity configurations. This localized optimization allows the system to achieve measurement precision without increasing overall device complexity.
Data Source
AI summary
Disclosed is a system and method that allows a user equipment (UE) to perform a wireless measurement. The method configures a characteristic of a channel-state information reference signal (CSI-RS) for tracking of the UE. Also disclosed is a system and method to perform radio resource management (RRM) testing. Testing can include: setting a power level of CSI-RS for tracking to a smaller value that a power level of another RRM reference signal; or setting a negative power offset value of the CSI-RS for tracking to a synchronization signal (SS) of the RRM reference signal; or setting a positive power offset value of the CSI-RS for tracking to a physical downlink shared channel (PDSCH) of the RRM reference signal.