Cell Reselection Method for 5G UE Ping-Pong Reduction
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, there is a challenge in efficiently managing cell reselection processes to prevent ping-pong phenomena, where a user equipment (UE) frequently switches between cells due to fluctuations in signal quality, leading to increased power consumption and reduced network stability.
Innovation Solution
A method and apparatus for a UE to reselect cells by determining whether to switch from a serving cell to a target cell based on specific parameters such as cell selection reception level and quality values, which are broadcast in system information, allowing for optimized cell reselection even in RRC idle or inactive states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell reselection is performed frequently to maintain connectivity, then connectivity reliability is improved, but power consumption increases and network stability deteriorates
Solution Approach 1:
The patent applies preliminary action by performing cell selection criterion evaluation before actual cell reselection occurs. The UE evaluates whether the target cell satisfies the cell selection criterion (S-criterion) using parameters received from the target cell before committing to reselection. This preliminary evaluation prevents unnecessary reselection actions, thereby reducing power consumption while maintaining connectivity reliability.
2Reliability
If cell reselection is performed frequently to maintain connectivity, then connectivity reliability is improved, but network stability deteriorates
Solution Approach 1:
The patent performs preliminary evaluation of the cell selection criterion before executing cell reselection. By evaluating whether Srxlev > 0 and Squal > 0 using parameters from the target cell before reselection, the system ensures that reselection only occurs when the target cell genuinely satisfies selection criteria. This prevents ping-pong effects and unnecessary handovers, thereby improving network stability while maintaining connectivity reliability.
3Measurement precision
If cell selection criterion evaluation is performed using parameters from target cell, then cell reselection accuracy is improved, but measurement and detection complexity increases
Solution Approach 1:
The patent applies self-service by having the target cell broadcast the necessary parameters (such as Qrxlevmin, Qqualmin, and other cell selection parameters) that the UE needs for evaluation. The UE autonomously performs the cell selection criterion evaluation using these broadcast parameters without requiring additional signaling or complex measurement procedures. This approach improves reselection accuracy while minimizing measurement and detection complexity.
Data Source
AI summary
A method, performed by a user equipment (UE), of reselecting a cell in a wireless communication system is provided. The method includes determining, by using at least one parameter received from a serving cell, whether to reselect at least one non-serving cell and reselecting a target cell from among the at least one non-serving cell, based on a result of the determining, wherein the reselecting of the target cell includes determining, by using at least one parameter received from the target cell, whether the target cell satisfies a cell selection criterion.