UE Cell Reselection Using Priority-Based Signal Thresholds
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently providing services due to the complexity of 5G communication systems, particularly in managing cell reselection procedures in environments with varying signal qualities and priorities across different frequencies and radio access technologies.
Innovation Solution
A method and apparatus for user equipment (UE) to perform cell reselection by receiving priority information, conducting cell measurements, and executing reselection procedures based on threshold signal qualities or powers, with considerations for optimal cell ranking ranges and beam counts, ensuring efficient transitions between cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell reselection procedures are performed in 5G networks with multiple frequencies and RATs, then service coverage and connectivity are improved, but system complexity and measurement overhead increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting cell reselection thresholds (Qin, Qout, Qoffset) based on frequency priority levels and signal conditions. The network configures different threshold parameters for different frequency types (anchor, non-anchor, E-UTRA), allowing the system to adapt measurement and reselection behavior to specific frequency characteristics, thereby managing complexity while maintaining reliability.
Solution Approach 2:
The patent segments the cell reselection process into distinct phases and conditions: initial cell selection, cell reselection in connected state, and cell reselection in idle state. Each phase has specific measurement requirements and threshold applications. This segmentation allows the system to manage complexity by only performing specific measurements and evaluations relevant to the current state, rather than continuously processing all possible reselection scenarios.
2Reliability
If frequent cell measurements are performed to ensure optimal connectivity, then service quality is improved, but energy consumption and processing load increase
Solution Approach 1:
The patent implements dynamic measurement behavior where the UE adjusts its measurement activity based on current signal conditions and frequency priorities. When signal quality degrades below certain thresholds, measurement frequency increases. When conditions are stable, measurements are reduced. This dynamic adaptation ensures service quality is maintained while minimizing unnecessary energy consumption during stable connection periods.
Solution Approach 2:
The network configures different measurement parameters (SIntraSearch, SNonIntraSearch, Qoffset) based on frequency priority and signal conditions. These parameter changes allow the system to reduce measurement frequency and processing load when signal quality is good, while increasing measurement intensity only when needed to maintain service quality.
3Reliability
If cell reselection thresholds are set to ensure seamless transitions, then service continuity is improved, but reselection latency and network switching overhead increase
Solution Approach 1:
The patent implements preliminary action by having the UE continuously monitor and evaluate neighbor cell qualities against pre-configured thresholds (Qin, Qout, Qoffset) before actual reselection is needed. The network pre-configures appropriate threshold values based on frequency priorities and service requirements, allowing the UE to prepare for potential reselection in advance. This reduces actual reselection latency when transitions are needed while avoiding unnecessary switching during stable conditions.
Data Source
AI summary
A method and user equipment (UE) for performing a cell reselection procedure is provided. The method includes receiving priority information about frequencies, performing cell measurement, based on the priority information, and performing a cell reselection procedure, based on a result of the cell measurement.