User Equipment Power Management via Conditional RAT Switching
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR and LTE, face challenges in efficiently managing power usage in user equipment (UEs) when switching between different radio access technologies (RATs), leading to unnecessary power consumption and battery drain, especially in IoT devices that require frequent scanning for alternative RATs during coverage loss or degradation.
Innovation Solution
A method and apparatus for a UE to dynamically switch between two RATs, such as Cat M1 and NB-IoT, by identifying a parameter associated with the event of coverage loss or degradation, comparing it to a second value, and determining whether to perform actions related to the first RAT based on this comparison, thereby reducing unnecessary scanning and conserving power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE frequently scans for alternative RATs during coverage loss or degradation, then the reliability of communication is improved, but the power consumption increases
Solution Approach 1:
The patent changes the parameter of scanning behavior from frequent/continuous to conditional/rare. By introducing a comparison mechanism that evaluates whether the event parameter exceeds a threshold, the system dynamically adjusts scanning frequency - only scanning when necessary (when parameter > threshold) and remaining camped on current RAT when not necessary (parameter ≤ threshold), thus reducing power consumption while maintaining communication reliability.
2Reliability
If the UE performs unnecessary scanning for alternative RATs, then the coverage reliability is maintained, but the battery life is reduced
Solution Approach 1:
The patent applies partial action by performing scanning only when necessary (when the parameter threshold is exceeded) rather than continuously. This conditional approach ensures coverage reliability is maintained only when needed, while avoiding excessive scanning that would drain battery life unnecessarily.
3Adaptability or versatility
If the UE switches between RATs dynamically, then the adaptability to network conditions is improved, but the device complexity increases
Solution Approach 1:
The patent implements dynamic behavior through a simple threshold-comparison mechanism. The UE monitors an event parameter, compares it against a threshold, and dynamically adjusts its behavior (scan or stay camped) based on the comparison result. This dynamic approach provides adaptability to network conditions while keeping the implementation relatively simple through the use of basic comparison logic rather than complex decision-making algorithms.
Data Source
AI summary
Aspects of the present disclosure provide techniques and apparatus for wireless communication. In one aspect, a method is provided which may be performed by a wireless device such as a user equipment (UE) that may support a first radio access technology (RAT) and a second RAT. The method generally includes: attempting to communicate with a base station (BS) of the first RAT; in response to an event, stopping the attempt to communicate with the BS of the first RAT; in response to stopping the attempt to communicate with the BS of the first RAT, attempting to connect to the second RAT; and in response to a successful connection to the second RAT: identifying a first value of a parameter associated with the event; comparing the value to a second value; and determining whether to perform an action associated with the first RAT based at least in part on the comparing.