UE Speed Estimation via Service-Excluded Cell Reselection Counting
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately estimating the speed of user equipment (UE) during cell reselection procedures, particularly when UE performs cell reselection due to user services, which can lead to incorrect mobility state determination.
Innovation Solution
A method and apparatus that count the number of cell reselections based on whether the reselection is due to a user service or not, excluding reselections caused by user services from the count, and estimate the UE's speed over a specific time period, using a processor and RF unit in the UE to differentiate between service-related and non-service-related reselections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all cell reselections are counted to estimate UE speed, then the speed estimation process is simple, but the accuracy of speed estimation deteriorates when UE performs reselection due to user services
Solution Approach 1:
The patent segments cell reselection events into two categories: those caused by user services (MBMS) and those caused by mobility. This segmentation allows the system to count only mobility-related reselections for speed estimation, excluding service-related reselections that would otherwise distort the measurement. The segmentation is implemented by monitoring reselection causes and selectively counting based on the identified cause.
Solution Approach 2:
The patent extracts and excludes service-related cell reselections from the speed estimation calculation. By identifying reselections caused by user services (particularly MBMS services) and removing them from the count, the system obtains a purified metric that reflects only mobility behavior. This extraction principle directly addresses the accuracy problem by eliminating the contaminating factor.
2Measurement precision
If cell reselections due to user services are excluded from counting, then speed estimation accuracy improves, but the complexity of distinguishing reselection causes increases
Solution Approach 1:
The patent implements a feedback mechanism where the UE monitors and identifies the cause of each cell reselection event. The system receives feedback information indicating whether a reselection was triggered by a user service or by mobility conditions. This feedback loop enables the UE to make informed decisions about whether to count a particular reselection event, thereby maintaining accuracy without excessive complexity.
3Measurement precision
If the UE monitors all cell reselection reasons, then the accuracy of mobility state detection improves, but the energy consumption and processing load increase
Solution Approach 1:
The patent extracts only the essential information needed for speed estimation - specifically, whether a reselection was caused by a user service or by mobility. Rather than monitoring and processing all possible reselection parameters, the system focuses on extracting the critical cause identifier, thereby reducing processing load and energy consumption while maintaining detection accuracy.
Data Source
AI summary
A method and apparatus for estimating a speed of a user equipment (UE) in a wireless communication system is provided. The method includes counting a number of cell reselections based on whether a cell is reselected due to a user service or not, and estimating a speed of the UE based on the number of the cell reselections.