Idle Mode Processing for User Equipment Mobility State
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Solution Overview
Problem
In wireless communication systems, user equipment (UE) in idle mode experiences unnecessary battery drain due to frequent cell reselection, especially in low mobility scenarios, caused by network misconfiguration and close cell measurement results, leading to inefficient wake-up and measurement processes.
Innovation Solution
An idle mode processing method that determines the UE's mobility state and applies a speed scaling factor to adjust idle mode processing parameters, delaying or skipping certain operations, such as cell reselection and paging decoding, to conserve power and reduce unnecessary measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE wakes up regularly to receive paging and perform cell measurement in idle mode, then the UE can maintain connection with the network and ensure camping on best cells, but the battery life is reduced due to frequent wake-ups and measurements
Solution Approach 1:
The patent applies dynamic adjustment of idle mode processing parameters based on UE mobility state. The network configures different parameter sets (e.g., paging cycle, cell measurement interval) according to whether the UE is in low mobility or high mobility state, allowing the system to adapt between reliability and energy consumption requirements dynamically
Solution Approach 2:
The patent changes key parameters such as idle mode processing parameter, cell measurement interval, and paging reception timing based on mobility state detection. By modifying these parameters according to UE movement characteristics, the system optimizes the balance between maintaining network connectivity and conserving battery power
2Reliability
If the UE performs frequent cell reselection to ensure camping on best cells, then the cell selection quality is improved, but the battery drain increases due to excessive measurements and processing
Solution Approach 1:
The patent applies partial action by performing cell measurements and reselection operations at reduced frequency for low mobility UEs. Instead of continuously monitoring all neighbor cells, the UE performs measurements at extended intervals configured by the network, which is sufficient to maintain acceptable cell selection quality while significantly reducing energy consumption
Solution Approach 2:
The system dynamically adjusts cell measurement and reselection behavior based on detected mobility state. For low mobility UEs, the network configures extended measurement intervals and relaxed reselection criteria, while for high mobility UEs, more frequent measurements and aggressive reselection are enabled, optimizing energy efficiency across different usage scenarios
3Device complexity
If the UE applies the same idle mode processing pace in all scenarios, then the system complexity is reduced, but the power efficiency deteriorates for low mobility UEs due to unnecessary frequent wake-ups
Solution Approach 1:
The patent applies different idle mode processing configurations to different UE mobility states. Instead of a uniform approach, the network provides mobility-state-specific parameter sets that tailor the idle mode behavior (paging cycle, measurement interval, wake-up timing) to the specific needs of low mobility versus high mobility UEs, optimizing power efficiency for each scenario
Data Source
AI summary
An idle mode processing method executable in a user equipment (UE) is provided, and includes: determining a UE mobility state of the UE; applying a speed scaling factor associated with a low mobility state of the UE to an idle mode processing parameter in response to the UE is in the low mobility state, the idle mode processing parameter is utilized for a criterion for triggering a specific idle mode operation in the idle mode, and the low mobility state is a state where a speed of the UE is lower than a first speed threshold; and adjusting the criterion using the speed scaling factor to delay or skip execution of the specific idle mode operation.