Wireless Terminal Timing Thresholds for Reliable Relaxed Measurement
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Solution Overview
Problem
Incorrect activation of relaxed measurement in wireless communication systems can lead to cell re-selection delay, radio link failure, or beam failure, particularly in scenarios where the terminal device incorrectly determines it is stationary due to unchanged RSRP levels caused by beamforming.
Innovation Solution
Implementing a threshold-based comparison of reference timing, such as downlink or uplink synchronization timing, to determine whether to initiate or stop relaxed measurement, ensuring that both legacy RRM relaxation criteria and synchronization criteria are met before allowing RRM relaxation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If relaxed measurement is activated based on RSRP levels, then measurement frequency is reduced and energy consumption decreases, but false stationary detection occurs leading to cell re-selection delay and radio link failure
Solution Approach 1:
The patent introduces reference timing (synchronization timing) as an intermediary parameter to mediate between energy saving goals and mobility reliability. The terminal device compares changes in reference timing against a threshold to determine whether to activate relaxed measurement, using this intermediary timing parameter to prevent false stationary detection while maintaining energy efficiency.
Solution Approach 2:
The patent changes the parameter used for stationary detection from RSRP levels to reference timing changes. By monitoring synchronization timing variations and comparing them against a threshold, the system dynamically adjusts the activation state of relaxed measurement, ensuring both energy efficiency and mobility reliability through parameter-based control.
2Productivity
If relaxed measurement is activated to reduce measurement frequency, then productivity increases, but measurement precision deteriorates leading to incorrect mobility decisions
Solution Approach 1:
The patent changes the detection parameter from RSRP levels to reference timing variations. By monitoring synchronization timing changes and comparing against a threshold, the system achieves accurate stationary detection with reduced measurement frequency, improving both productivity and maintaining measurement precision through parameter transformation.
Solution Approach 2:
The patent substitutes the traditional RSRP-based detection mechanism with a timing-based detection mechanism. Instead of relying on signal strength measurements, the system uses reference timing comparisons to determine stationary state, replacing one measurement mechanism with another that achieves the same goal with higher precision at lower measurement frequency.
3Loss of energy
If RRM relaxation is configured frequently to improve energy saving, then loss of energy decreases, but reliability of connection deteriorates due to incorrect activation
Solution Approach 1:
The patent implements a feedback mechanism where the terminal device continuously monitors reference timing changes and compares them against a threshold. This feedback loop dynamically controls the activation and deactivation of relaxed measurement, ensuring that energy saving measures are applied only when appropriate (when the device is truly stationary), thereby maintaining connection reliability while reducing energy waste.
Solution Approach 2:
The patent performs preliminary timing-based verification before activating relaxed measurement. By first checking whether reference timing changes exceed the threshold, the system preliminarily determines whether the device is stationary before enabling energy-saving measurement relaxation, preventing incorrect activation that would compromise connection reliability.
Data Source
AI summary
Disclosed is a method comprising comparing, by a terminal device in a radio access network, a change in reference timing with a threshold value; and 5 applying or stopping, by the terminal device, relaxed measurement on one or more cells of the radio access network based at least partly on the comparison.