UE Power-Saving Control During Emergency 5GS and EPS Session Transfer

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Solution Overview

Problem

Existing power-saving features for UEs with emergency PDU sessions or PDN connections in 3GPP access do not account for the transition to non-3GPP access, leading to inefficient power consumption during handovers and transfers.

Innovation Solution

UEs suspend power-saving features like PEIPS or WUS upon establishing emergency sessions and resume them after successful transitions out of 3GPP access, ensuring power-efficient operations across different network types.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If UE applies power-saving features (PEIPS/WUS) during emergency sessions in 3GPP access, then power consumption is reduced, but reliability of emergency service is compromised

Engineering Contradiction:

Improvepower consumptionVSAvoidemergency service reliability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The UE dynamically adjusts its power-saving feature application based on the emergency session state. When an emergency PDU session or PDN connection is detected, the UE suspends PEIPS/WUS operations to ensure reliable emergency service. When the emergency session is released or transferred to non-3GPP access, the UE resumes power-saving features. This dynamic state-based adjustment resolves the contradiction by making power-saving behavior conditional rather than static.

Inventive Principle:

Principle #15Dynamics

2Reliability

If UE suspends power-saving features during emergency sessions, then reliability of emergency service is maintained, but power consumption increases

Engineering Contradiction:

Improveemergency service reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The UE applies different power-saving strategies to different access types. In 3GPP access during emergency sessions, power-saving features are suspended to ensure reliability. In non-3GPP access or non-emergency sessions, power-saving features remain active. This local differentiation allows the system to optimize for reliability where needed while maintaining power efficiency elsewhere, resolving the contradiction through context-specific behavior.

Inventive Principle:

Principle #3Local quality

3Use of energy by moving object

If UE uses PEIPS/WUS during emergency sessions, then power consumption is reduced, but device complexity increases due to state management

Engineering Contradiction:

Improvepower consumptionVSAvoidstate management complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The UE implements feedback mechanisms to monitor the state of emergency PDU sessions and PDN connections. Based on this feedback, the UE automatically adjusts its power-saving feature application. The UE checks for the presence of emergency sessions, suspends PEIPS/WUS when detected, and resumes them when the emergency condition clears. This feedback-driven approach manages complexity systematically while maintaining power-saving benefits where appropriate.

Inventive Principle:

Principle #23Feedback

4Adaptability or versatility

If UE transitions emergency session from 3GPP to non-3GPP access, then adaptability is improved, but loss of time occurs during handover

Engineering Contradiction:

Improvenetwork access adaptabilityVSAvoidhandover time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The UE prepares for potential emergency session transfer by maintaining the capability to operate in both 3GPP and non-3GPP access modes. When an emergency session is established in 3GPP access, the UE proactively suspends power-saving features in anticipation of possible transfer scenarios. This preliminary preparation reduces the impact of handover time loss by ensuring seamless transition capabilities are already in place before the actual transfer occurs.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12568405B2Power saving feature assistance information in 5GS and EPS

Publication Date: 2026.03.03 MEDIATEK INC

AI summary

A method of applying power-saving feature assistance information for emergency PDU session or PDN connection for emergency bearer service associated with 3GPP access is provided. In 5GS, when an emergency PDU session (associated with 3GPP access) is successfully established after the UE received the Negotiated PEIPS assistance information IE during the last registration procedure, the UE does not use the PEIPS assistance information until the emergency PDU session is successfully moved out of 5GS 3GPP access. In EPS, when an PDN connection for emergency bearer service is successfully established after the UE received the Negotiated WUS assistance information IE during the last registration (Attach/TAU) procedure, the UE does not use the WUS assistance information until the PDN connection for emergency bearer service is successfully moved out of EPS.