Cell Reselection Bias for Preferred RAT Connectivity
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Solution Overview
Problem
Current wireless communication systems face challenges in maximizing connectivity to a preferred Radio Access Technology (RAT) while minimizing connectivity to non-preferred RATs, especially in 5G networks where ensuring NR connectivity is crucial for user experience.
Innovation Solution
The implementation of reselection parameters that define biases to favor connectivity to preferred RAT capable cells over non-preferred RAT capable cells. These parameters include current serving cell reselection offsets and new serving cell selection offsets, which are used by user equipment (UE) to determine when to trigger cell reselection and select a new serving cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell reselection is triggered frequently to find preferred RAT cells, then connectivity to preferred RAT is improved, but time without NR coverage increases and user experience deteriorates
Solution Approach 1:
The network performs preliminary actions by pre-configuring the UE with reselection parameters including offsets and thresholds before the UE needs to make cell reselection decisions. These pre-configured parameters enable the UE to quickly determine whether to trigger reselection without extensive real-time calculations, reducing the time without NR coverage while maintaining reliable preferred RAT connectivity.
Solution Approach 2:
The invention changes parameters by introducing configurable reselection parameters (offsets, thresholds, hysteresis values) that modify the cell reselection behavior. By adjusting these parameters, the system optimizes the balance between triggering reselection frequently enough to maintain preferred RAT connectivity and avoiding excessive reselections that would increase time without coverage.
2Reliability
If reselection parameters are configured to favor preferred RAT, then connectivity to preferred RAT is improved, but device complexity increases due to additional parameter management
Solution Approach 1:
The UE performs self-service by autonomously evaluating cell reselection conditions using pre-configured parameters received from the network. The UE independently determines whether to trigger reselection based on measured signal qualities, configured offsets, and thresholds without requiring complex network control or additional signaling during the reselection process, thereby reducing device complexity while maintaining improved preferred RAT connectivity.
3Reliability
If cell reselection thresholds are lowered to increase connectivity opportunities, then preferred RAT availability is improved, but unnecessary reselections increase causing signaling overhead
Solution Approach 1:
The invention applies preliminary anti-action by configuring hysteresis offsets and thresholds that prevent unnecessary reselections before they occur. These pre-configured parameters create a buffer that filters out marginal signal quality variations, ensuring that reselection is only triggered when there is a significant improvement in signal quality, thereby reducing signaling overhead while maintaining high preferred RAT availability.
Data Source
AI summary
Techniques to maximize connectivity to a preferred radio access technology (RAT) (e.g., 5G NR) over a less preferred RAT (e.g., 4G LTE) are disclosed. When a user equipment (UE) is camped on a preferred RAT connectivity capable cell (e.g., NR cell, EUTRA dual-connectivity (ENDC) cell), offsets or biases may be applied to delay triggering of a cell reselection. When UE is camped on a non-preferred RAT connectivity capable cell, offset(s) may be applied to accelerate triggering of the cell reselection. When cell reselection is triggered, offsets or biases may be applied to favor reselection to preferred RAT connectivity capable cell over a non-preferred RAT connectivity capable cell.