Terminal Measurement Thresholds for Satellite Cell Reselection
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Solution Overview
Problem
In non-terrestrial communication systems, the reliability of cell reselection and handover procedures is compromised due to the rapid changes in channel status caused by the movement of satellites, leading to inefficiencies and increased power consumption.
Innovation Solution
A terminal device dynamically adjusts intra-frequency and/or inter-frequency cell-reselection and connected-state measurement thresholds based on location information, such as distance and height angle, to optimize the timing of these procedures and reduce unnecessary measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If satellite-based network devices are used to provide seamless coverage, then coverage area is improved, but channel status changes sharply due to satellite movement, reducing reliability
Solution Approach 1:
The patent applies dynamics by making the measurement thresholds adjustable rather than fixed. The network device configures different measurement thresholds (first threshold for cell reselection, second threshold for connected-state measurement) based on the terminal's distance from the network device. This dynamic adjustment compensates for the sharp channel status changes caused by satellite movement, maintaining reliability while preserving wide coverage.
Solution Approach 2:
The patent changes the measurement threshold parameter based on distance. When the terminal is far from the network device, a first (higher) threshold is used to trigger measurements earlier. When the terminal is close, a second (lower) threshold is used to avoid excessive measurements. This parameter change adapts to the varying channel conditions caused by satellite movement, resolving the reliability issue while maintaining coverage.
2Reliability
If measurement procedures are triggered frequently to maintain connection reliability, then reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies local quality by using different measurement thresholds for different distance conditions. Instead of using a uniform threshold, the system applies a first threshold when the terminal is far from the network device and a second threshold when it is close. This localized approach ensures reliable connection maintenance only where necessary, reducing unnecessary measurements and power consumption in close-proximity scenarios.
Solution Approach 2:
The patent changes the measurement threshold parameter based on the terminal's distance from the network device. By dynamically adjusting the threshold (higher when far, lower when close), the system triggers measurements only when appropriate, avoiding excessive power consumption while maintaining connection reliability where needed.
3Device complexity
If fixed measurement thresholds are used, then device complexity is reduced, but measurement timing is inaccurate due to varying distance
Solution Approach 1:
The patent makes the measurement threshold dynamic rather than fixed. The network device configures different thresholds based on the terminal's distance, allowing the system to adapt to varying channel conditions caused by satellite movement. This dynamic approach improves measurement timing accuracy without significantly increasing device complexity, as the threshold selection is based on straightforward distance calculations.
Solution Approach 2:
The patent changes the measurement threshold parameter according to distance conditions. By using a first threshold for far-distance scenarios and a second threshold for close-proximity scenarios, the system achieves accurate measurement timing without complex configurations. The parameter change is driven by simple distance-based logic, maintaining ease of implementation while improving precision.
Data Source
AI summary
A transmission parameter obtaining method includes obtaining, by a terminal device, a transmission parameter of a network device, wherein the transmission parameter indicates location information of the network device. The method also includes determining, by the terminal device, at least one of an intra-frequency cell-reselection measurement threshold or an inter-frequency cell-reselection measurement threshold based on the transmission parameter. The method further includes determining, by the terminal device, a radio link failure threshold based on the transmission parameter. The method additionally includes determining, by the terminal device, at least one of an intra-frequency connected-state measurement threshold or an inter-frequency connected-state measurement threshold based on the transmission parameter.