Adaptive CSI-RS Measurement Modes for Inter-Frequency RRM
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Solution Overview
Problem
Current wireless communication systems face challenges in optimizing radio resource management (RRM) measurements, particularly for CSI-RS based inter-frequency measurements when the CSI-RS bandwidth overlaps partially with the active downlink bandwidth, leading to undefined UE behavior and measurement latency issues.
Innovation Solution
The implementation of two measurement modes: one that interrupts downlink reception to measure the complete CSI-RS within a gap, and another that measures only the overlapped CSI-RS within the active serving cell bandwidth without interruptions, dynamically selected based on the number of overlapped resource blocks and signal-to-interference-plus-noise ratio (SINR) conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE interrupts downlink reception to measure the complete CSI-RS within a gap, then measurement accuracy is improved, but downlink reception interruptions increase
Solution Approach 1:
The patent segments the CSI-RS measurement process into two distinct modes: Mode 1 for complete CSI-RS measurement with downlink interruption, and Mode 2 for partial CSI-RS measurement without interruption. The network configures both modes and the UE selects based on conditions, allowing the system to divide the measurement problem into manageable parts that can be adaptively chosen.
Solution Approach 2:
The patent implements dynamic mode selection where the UE can switch between Measurement Mode 1 and Measurement Mode 2 based on real-time conditions including the number of overlapped resource blocks and SINR thresholds. This dynamic adaptation allows the system to optimize the trade-off between measurement accuracy and downlink reception continuity.
2Productivity
If the UE measures only the overlapped CSI-RS within the active serving cell bandwidth without interruptions, then downlink reception continuity is maintained, but measurement accuracy deteriorates
Solution Approach 1:
The patent applies partial action by allowing the UE to measure only the portion of CSI-RS that overlaps with the active downlink bandwidth in Mode 2, rather than requiring complete CSI-RS measurement. This partial measurement approach maintains downlink continuity while still providing sufficient measurement data for RRM decisions in many scenarios.
Solution Approach 2:
The patent changes the measurement parameters dynamically by adjusting which CSI-RS resources are measured based on the configured mode. In Mode 1, all CSI-RS resources are measured; in Mode 2, only overlapped resources are measured. The network can configure thresholds and parameters that control this behavior.
3Adaptability or versatility
If the network configures both measurement modes with different thresholds, then adaptability to varying conditions is improved, but device complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the UE evaluates current conditions (SINR, number of overlapped RBs) against configured thresholds and automatically selects the appropriate measurement mode. The network provides feedback configurations including thresholds and parameters, and the UE reports measurement results that can trigger mode reconfiguration.
Solution Approach 2:
The patent enables self-service by allowing the UE to autonomously select between Measurement Mode 1 and Measurement Mode 2 based on pre-configured thresholds and current channel conditions. The UE independently evaluates whether the number of overlapped resource blocks exceeds a threshold and whether SINR conditions permit partial measurement, eliminating the need for continuous network intervention.
Data Source
AI summary
Embodiments herein provide techniques and requirements for radio resource management (RRM) measurements. For example, embodiments include techniques and requirements associated with: channel state information (CSI)-reference signal (RS) based inter-frequency RRM measurements when the CSI-RS bandwidth and the active downlink (DL) bandwidth part (BWP) are partially overlapped; adaptive RRM CSI-RS configuration and DL gap allocation by user equipment (UE) capability indication; and/or neighboring cell RRM CSI-RS measurement requirements when serving cell RRM CSI-RS is not configured. Other embodiments may be described and claimed.