NR Handover Mode Switching for RedCap Emergency Service Continuity

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently performing emergency services when a RedCap-capable terminal is handed over to an NR cell that does not support the RedCap function, leading to increased power consumption and signaling overhead due to RRC connection re-establishment procedures.

Innovation Solution

The terminal switches its operation mode from RedCap mode to NR normal mode upon receiving a handover command to an NR cell that does not support RedCap, allowing it to perform emergency services without RRC connection re-establishment, thereby reducing power consumption and signaling overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the terminal performs RRC connection re-establishment procedure when handed over to an NR cell not supporting RedCap, then the emergency service can be maintained, but power consumption increases and signaling overhead increases

Engineering Contradiction:

Improveemergency service continuityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The terminal dynamically switches its operation mode from RedCap mode to normal mode when detecting that the target NR cell does not support RedCap function. This dynamic adaptation allows the terminal to maintain emergency service continuity through RRC connection re-establishment only when necessary, rather than forcing RedCap mode operation in incompatible cells, thereby reducing unnecessary power consumption while ensuring service reliability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The terminal changes its operational parameters by switching between RedCap mode and normal mode based on the capability matching between the terminal and the target cell. When the target cell does not support RedCap, the terminal transitions to normal mode parameters, enabling it to perform RRC connection re-establishment procedures appropriately while minimizing energy expenditure compared to attempting RedCap operations in incompatible cells.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the terminal performs RRC connection re-establishment procedure when handed over to an NR cell not supporting RedCap, then the emergency service can be maintained, but signaling overhead increases

Engineering Contradiction:

Improveemergency service continuityVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The terminal dynamically adjusts its handover behavior based on cell capability detection. By switching from RedCap mode to normal mode when the target cell does not support RedCap, the terminal enables appropriate RRC connection re-establishment procedures while avoiding the excessive signaling overhead that would result from forcing RedCap mode operations in incompatible cells.

Inventive Principle:

Principle #15Dynamics

3Use of energy by moving object

If the terminal switches from RedCap mode to NR normal mode to access NR cell without RedCap support, then power consumption is reduced and signaling overhead is minimized, but the terminal must maintain operation mode switching capability

Engineering Contradiction:

Improvepower consumptionVSAvoidoperation mode switching mechanism

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The terminal implements a dynamic operation mode switching mechanism that transitions between RedCap mode and normal mode based on real-time detection of target cell capabilities. This dynamic approach reduces power consumption by avoiding unnecessary RedCap mode operations in incompatible cells while maintaining relatively simple implementation through standardized mode switching procedures defined in the communication protocol.

Inventive Principle:

Principle #15Dynamics

4Device complexity

If the terminal operates in RedCap mode and receives handover command to NR cell without RedCap support, then the terminal is designed for low complexity, but the terminal cannot access the NR cell without mode switching

Engineering Contradiction:

Improveterminal complexityVSAvoidcell access capability

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The terminal employs dynamic operation mode switching to adapt to different cell types. By transitioning from RedCap mode to normal mode when detecting an NR cell without RedCap support, the terminal maintains its low complexity design while gaining the adaptability to access both RedCap-supported and non-RedCap NR cells, thereby resolving the contradiction between simplicity and versatility.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12501328B2Electronic device and method for performing emergency service in wireless communication system

Publication Date: 2025.12.16 SAMSUNG ELECTRONICS CO LTD

AI summary

A method performed by a terminal in a wireless communication system is provided. The method includes receiving, from a serving base station, a radio resource control (RRC) message including a handover command to new radio (NR) cell, while performing an emergency service on long term evolution (LTE) cell. The method includes identifying whether the NR cell supports a reduced capability (RedCap) function, based on system information on the NR cell. The method includes switching an operation mode of the terminal from RedCap mode to an NR normal mode, in case that the NR cell does not support RedCap function. The method includes, while the terminal operates in the NR normal mode, performing the emergency service on the NR cell through access to the NR cell. The method includes, in response to termination of the emergency service, switching the operation mode of the terminal from NR normal mode to RedCap mode.