Wireless Device Cell Reselection Mobility State Estimation
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately estimating the mobility state of wireless devices during cell reselection, leading to suboptimal performance in maintaining appropriate mobility states that align with actual device behavior.
Innovation Solution
A method and apparatus that involve performing cell reselection based on signal quality measurements, applying a scaling factor to the cell reselection counting period, and estimating the mobility state of the wireless device, allowing for extended cell reselection counting periods when signal quality is within a certain range, thereby maintaining accurate mobility state estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cell reselection counting period is extended to maintain accurate mobility state estimation, then the reliability of mobility state estimation is improved, but the time required for determining the number of cell reselections increases
Solution Approach 1:
The patent applies dynamics by making the cell reselection counting period variable rather than fixed. The period is dynamically adjusted based on the wireless device's mobility state - extending the period for high-mobility devices to capture sufficient reselection events, while using shorter periods for low-mobility devices. This resolves the contradiction by adapting the time parameter to the specific operational context, maintaining estimation reliability without unnecessary time extension in all cases.
Solution Approach 2:
The patent changes the parameter of the cell reselection counting period based on detected mobility conditions. When high mobility is detected, the counting period is extended to ensure accurate estimation; when mobility is low, the period is reduced. This parameter adaptation directly addresses the contradiction by adjusting the time dimension according to the reliability requirements of each specific scenario.
2Measurement precision
If the scaling factor is applied to extend the cell reselection counting period based on signal quality range, then the mobility state estimation accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by introducing signal quality range as a local condition that determines the application of scaling factors. Different signal quality ranges (local conditions) trigger different scaling factor applications, allowing precise mobility estimation adapted to local radio conditions without requiring a completely complex system-wide redesign. The complexity is localized to the signal quality evaluation and scaling factor selection logic.
Solution Approach 2:
The patent performs preliminary action by pre-defining scaling factors for different signal quality ranges before actual mobility estimation occurs. This preparation work is done in advance based on expected signal quality conditions, so that during operation, the system only needs to evaluate the current signal quality and apply the appropriate pre-determined scaling factor, rather than computing complex adjustments in real-time.
3Reliability
If the cell reselection counting period is extended for all devices, then the mobility state estimation is improved, but the productivity of the cell reselection process decreases
Solution Approach 1:
The patent applies partial action by extending the cell reselection counting period only when necessary - specifically for high-mobility devices and under certain signal quality conditions. For low-mobility devices or favorable conditions, the standard counting period is used. This selective extension maintains estimation reliability where needed while preserving cell reselection efficiency in scenarios that don't require extended observation periods.
Data Source
AI summary
The present disclosure relates to cell reselection in wireless communications. According to an embodiment of the present disclosure, a method performed by a wireless device in a wireless communication system comprises: performing a cell reselection to a cell; receiving information for a signal quality range, information for a scaling factor for the signal quality range and information for a time period for determining a number of cell reselections; based on a determination that a signal quality measured for the cell is within the signal quality range, applying the scaling factor for the signal quality range to the time period; and estimating a mobility state of the wireless device based on the time period to which the scaling factor is applied.