Cell Reselection Measurement Termination Using Trend Analysis
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Solution Overview
Problem
Conventional mechanisms for determining when to cease measurements of higher-priority layers in cellular communication systems often result in premature decisions, leading to inefficient performance at both the system and user equipment levels.
Innovation Solution
The user equipment repeatedly measures characteristics of higher-priority layers and ceases measurement-taking when at least one measured value falls below a predetermined threshold and a negative trend is detected, using a hysteresis threshold level or system-defined threshold, and considering the trend of measurements to decide how long to continue measuring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If measurement termination is based on conventional threshold mechanisms, then measurement resources are conserved, but premature termination occurs leading to inefficient performance
Solution Approach 1:
The patent implements a feedback mechanism by continuously monitoring the trend of measurement values over time. The UE evaluates whether measurement values are improving or deteriorating based on historical data, and this feedback determines whether to terminate measurements. This prevents premature termination by ensuring measurements continue as long as there is a positive trend, even if current values are below threshold, while allowing termination when negative trends are detected.
Solution Approach 2:
The patent applies preliminary action by establishing a trend evaluation mechanism before making termination decisions. Instead of immediately terminating when a threshold is crossed, the system first assesses the trend direction (improving or deteriorating) based on previous measurements. This preliminary trend analysis ensures that termination decisions are made with forward-looking information, preventing premature termination caused by temporary threshold violations.
2Use of energy by moving object
If measurements of higher-priority layers are ceased early to save resources, then energy consumption is reduced, but the UE may miss improving conditions for cell reselection
Solution Approach 1:
The patent applies dynamics by making the measurement termination decision adaptive rather than static. The termination criterion dynamically evaluates both the current measurement value relative to threshold and the trend direction (improving or deteriorating). This dynamic approach allows the system to adjust measurement behavior based on real-time conditions, continuing measurements when trends indicate potential improvement while conserving energy when trends are negative, thus optimizing both energy consumption and reselection efficiency.
3Measurement precision
If the UE continues measuring higher-priority layers longer to avoid premature termination, then cell reselection decisions are more accurate, but measurement resources and time are consumed
Solution Approach 1:
The patent uses feedback by continuously evaluating the trend of measurement values to determine when to terminate measurements. The trend evaluation provides feedback on whether measurements are likely to lead to beneficial reselection decisions. When the trend is positive, measurements continue to ensure accurate decisions; when the trend is negative, measurements are terminated to save time. This feedback-driven approach optimizes the balance between measurement accuracy and time consumption.
Data Source
AI summary
A user equipment (UE) is operated in a cellular communication system in which radiofrequency resources are partitioned into layers, each layer being associated with one of a set of hierarchical priority levels. While camped on a serving cell whose signals are transmitted on a first layer associated with a first priority level, the UE repeatedly measures a characteristic of a second layer that is present within its surroundings and generates from these measurements a plurality of measured surroundings data, wherein the second layer is associated with a second priority level that is higher than the first priority level. The UE ceases measuring the characteristic of the second layer that is present within the UE's surroundings in response to detecting both that at least one of the measured surroundings data is less than a predetermined threshold level and that a trend of the measured surroundings data is negative.