Mobile Cell Reselection Priority for Lower UE Power Use
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently prioritizing cell reselection for user equipment (UE) during mobility, leading to unnecessary cell reselections and increased power consumption.
Innovation Solution
The method involves identifying cells with quality above a threshold and prioritizing them for reselection based on system information indicating mobility status, allowing UE to camp on suitable cells and avoid unnecessary reselections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE performs cell reselection based on traditional quality threshold alone, then cell reselection is triggered when quality changes, but unnecessary reselections occur increasing power consumption
Solution Approach 1:
The patent introduces multiple parameters beyond simple quality threshold (cell status as mobile/stationary, mobility state of UE, reselection priority) to determine cell reselection. This multi-parameter approach changes the decision criteria from a single quality metric to a composite evaluation, reducing unnecessary reselections while maintaining connection reliability.
Solution Approach 2:
The patent dynamically adjusts cell reselection behavior based on the mobility state of the UE. When UE is in high mobility state, the system adapts reselection parameters to accommodate frequent movements, while in low mobility state, it employs stricter criteria to avoid unnecessary reselections, thereby optimizing power consumption according to actual movement conditions.
2Speed
If UE frequently monitors and evaluates cell quality, then cell reselection responsiveness improves, but power consumption increases
Solution Approach 1:
The patent implements periodic cell quality monitoring with evaluation intervals that adapt to UE mobility state. Instead of continuous monitoring, the system performs evaluations at optimized intervals - more frequent when mobility is high and less frequent when mobility is low - maintaining responsiveness while significantly reducing power consumption from constant monitoring.
3Device complexity
If UE performs cell reselection without considering cell mobility status, then reselection process is simple, but unnecessary reselections to mobile cells occur
Solution Approach 1:
The patent performs preliminary classification of cells as mobile or stationary based on their status information before the actual reselection decision. This pre-categorization allows the UE to exclude mobile cells from reselection candidates in advance, preventing unnecessary reselections and improving stability without adding significant complexity to the overall process.
Data Source
AI summary
The present disclosure relates to prioritization for cell reselection in a wireless communication system. According to an embodiment of the present disclosure, a method performed by a user equipment (UE) in a wireless communication system comprises: identifying a cell of which quality is higher than a quality threshold; prioritizing the cell for cell reselection based on i) receiving, from a network, system information informing that the cell is a mobile cell; and ii) a relative mobility state between the UE and the cell; and performing a cell reselection to one of cells including the prioritized cell.