UE Power Saving Relaxation Criterion for FR2 Beam Stability
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Solution Overview
Problem
In wireless communication systems, existing power saving methods for user equipment (UE) may cause adverse effects on system performance, particularly in scenarios with fast beam changes, such as in Frequency Range 2 (FR2), where a longer evaluation period for power saving can worsen system performance.
Innovation Solution
Implementing a method that allows the UE to enter a relaxation mode with a longer evaluation period based on serving cell quality and low mobility criteria, enabling power saving without significant impact on system performance by dynamically switching between normal and relaxed evaluation periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a longer evaluation period is used for power saving, then UE power consumption is reduced, but system performance deteriorates in scenarios with fast beam changes
Solution Approach 1:
The patent implements dynamic switching between normal evaluation mode and relaxed evaluation mode based on real-time criteria assessment. The UE evaluates serving cell quality and mobility state, then dynamically adjusts the evaluation period length accordingly. This dynamic adaptation resolves the contradiction by allowing long evaluation periods (power saving) only when conditions permit (stable connection, low mobility), while switching to short evaluation periods (performance) when conditions require it (fast beam changes, poor quality).
Solution Approach 2:
The patent changes the evaluation period parameter based on assessed conditions. When criteria are met (good serving cell quality, low mobility state), the evaluation period is extended to achieve power saving. When criteria are not met (fast beam changes, poor quality), the evaluation period remains normal to maintain system performance. This parameter adjustment strategy resolves the contradiction by making the evaluation period adaptive rather than fixed.
2Use of energy by moving object
If a longer evaluation period is used for power saving, then UE power consumption is reduced, but beam failure detection capability deteriorates
Solution Approach 1:
The patent dynamically adjusts evaluation period length based on mobility state and serving cell quality assessment. In stable conditions (low mobility, good quality), the relaxed evaluation period extends measurement time to save power while maintaining adequate detection capability. In unstable conditions (high mobility, fast beam changes), the normal evaluation period ensures timely beam failure detection. This dynamic adjustment resolves the contradiction between power saving and detection precision.
Solution Approach 2:
The patent implements a feedback mechanism where the UE continuously monitors serving cell quality and mobility state, then uses this feedback to determine whether to enter or exit relaxation mode. The feedback loop ensures that evaluation period length always matches current channel conditions, resolving the contradiction by preventing extended evaluation periods when they would compromise beam failure detection capability.
3Use of energy by moving object
If relaxation mode is enabled unconditionally, then UE power saving is maximized, but system performance is adversely affected
Solution Approach 1:
The patent applies relaxation mode selectively based on local conditions (serving cell quality and mobility state) rather than universally. The UE assesses specific criteria including RSRP/RSRQ thresholds and mobility state indicators to determine whether relaxation is appropriate for the current local situation. This selective application resolves the contradiction by enabling power saving only in locations/conditions where it won't harm system performance.
Solution Approach 2:
The patent changes the evaluation period parameter conditionally based on assessed criteria. When serving cell quality exceeds thresholds and mobility state indicates stability, the evaluation period is extended for power saving. When criteria indicate fast beam changes or poor quality, the evaluation period remains normal. This conditional parameter change resolves the contradiction between maximizing power saving and maintaining system performance.
Data Source
AI summary
A method for a user equipment (UE) includes: determining that a first set of criteria is met for relaxing an evaluation; in response to the determining that the first set of criteria is met, entering a relaxation mode in which the evaluation is performed by the UE using a relaxed evaluation period, the relaxed evaluation period longer than a normal evaluation period with which the evaluation is not relaxed; determining that a second set of criteria is met for not relaxing the evaluation; and in response to the determining that the second set of criteria is met, exiting the relaxation mode to perform the evaluation using the normal evaluation period.