Inter-RAT Redirection Using Multi-Metric Cell Quality Thresholds
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in network-to-network redirection, leading to ping-pong effects and resource wastage due to redirection to poor target cells, which degrade user experience and waste network and UE resources.
Innovation Solution
A UE is configured to selectively provide measurement reports and manage RRC connections based on multiple reference signal metrics, including RSRP, RSRQ, and SNR thresholds, to avoid redirection to poor target cells and reduce ping-pong effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE provides measurement reports based on a single reference signal metric threshold, then the redirection trigger is simple and fast, but the UE may be redirected to poor target cells causing ping-pong effects and resource wastage
Solution Approach 1:
The patent changes the parameter evaluation from a single threshold check to multiple threshold checks across different reference signal metrics (RSRP, RSRQ, SINR). The UE evaluates whether multiple metrics simultaneously satisfy their respective thresholds before triggering redirection, ensuring more reliable target cell selection while maintaining automated operation.
2Loss of time
If the UE redirects to the first available RAT meeting the threshold, then the redirection process is fast, but it may waste network and UE resources by redirecting to poor quality cells
Solution Approach 1:
The patent applies preliminary action by having the UE pre-evaluate multiple reference signal metrics (RSRP, RSRQ, SINR) against their respective thresholds before initiating redirection. This preliminary multi-criteria assessment ensures that only cells meeting all quality requirements are selected as targets, preventing wasteful redirections to poor quality cells while maintaining efficient automated operation.
3Measurement precision
If the UE uses multiple reference signal metrics for measurement reporting, then the target cell selection accuracy is improved, but the measurement and reporting complexity increases
Solution Approach 1:
The patent segments the measurement evaluation into distinct reference signal metrics (RSRP, RSRQ, SINR), each with its own threshold configured by the network. The UE independently evaluates each metric against its threshold and only triggers redirection when all metrics simultaneously satisfy their requirements. This segmentation approach improves measurement precision through multi-criteria evaluation while maintaining manageable complexity through modular threshold checking.
Data Source
AI summary
In some implementations, a user equipment (UE) may detect a trigger to provide a measurement report associated with a redirection from a first radio access technology (RAT) to a second RAT. The trigger may be a reference signal metric associated with the second RAT satisfying a threshold associated with the reference signal metric. The threshold may be configured by abase station. The UE may selectively provide the measurement report based at least in part on whether one or more other reference signal metrics satisfy one or more other thresholds corresponding to the one or more other reference signal metrics. Numerous other aspects are provided.