L1/L2 Triggered Mobility Measurement Gaps for Target-Cell DTX/DRX

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Solution Overview

Problem

Existing technologies face inefficiencies in LTM interworking with Cell DTX/DRX configurations, leading to delayed inter-frequency measurements and unsuccessful LTM cell switches due to suboptimal measurement gaps and power consumption issues in telecommunication networks.

Innovation Solution

A system and method that determine an optimal measurement gap based on the active duration of Cell DTX/DRX cycles, enabling efficient inter-frequency measurements and timely reporting of successful LTM cell switches, even when target cells are configured with DTX/DRX.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by stationary object

If Cell DTX/DRX is configured at the target cell for energy saving, then network energy consumption is reduced, but inter-frequency measurement timing becomes delayed and LTM cell switch may fail

Engineering Contradiction:

Improvenetwork energy consumptionVSAvoidinter-frequency measurement timing

Core Design Contradiction:

Use of energy by stationary objectVSLoss of time

Solution Approach 1:

The source gNB determines the optimal measurement gap timing in advance based on the target cell's DTX/DRX active duration before executing the LTM cell switch. This preliminary timing calculation ensures that the UE performs inter-frequency measurements during periods when the target cell is active, preventing measurement delays while maintaining the energy-saving DTX/DRX configuration

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The measurement gap timing is dynamically adjusted according to the active duration of the target cell's DTX/DRX cycle. The source gNB calculates the optimal measurement gap (MG) based on real-time knowledge of when the target cell will be active, making the measurement process adaptive to the energy-saving configuration rather than static

Inventive Principle:

Principle #15Dynamics

2Reliability

If measurement gap timing is not optimized for DTX/DRX cycles, then LTM cell switch may fail, but network energy consumption increases due to unnecessary cell switch operations

Engineering Contradiction:

ImproveLTM cell switch success rateVSAvoidnetwork energy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by stationary object

Solution Approach 1:

The source gNB uses feedback information about the target cell's DTX/DRX configuration to determine the optimal measurement gap timing. By incorporating this feedback into the timing calculation, the system ensures reliable LTM cell switch execution while avoiding unnecessary cell switch operations that would waste energy

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The measurement gap parameters (timing, duration, periodicity) are changed and optimized based on the DTX/DRX cycle characteristics of the target cell. This parameter adjustment ensures that measurements are performed during active periods, improving LTM success rate while maintaining energy efficiency

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250247914A1Layer1/layer2 triggered mobility interworking with cell DTX/DRX at target cell

Publication Date: 2025.07.31 RAKUTEN SYMPHONY INC

AI summary

Example embodiments of the present disclosure relate to Layer 1/Layer 2 (L1/L2) Triggered Mobility (LTM) interworking with Cell Discontinuous Transmission (DTX)/Discontinuous Reception (DRX) at a target cell. According to one or more embodiments, a system may include a distributed unit (DU) that may be configured to determine, based on an active duration of a Cell DTX/DRX cycle associated with an inter-frequency cell, an optimal measurement gap (MG). Further, the DU may be configured to provide, to a user equipment (UE), information of the optimal MG, wherein the information of the optimal MG may be utilized by the UE to perform an inter frequency measurement.