UE Network Slice Failure Management via Rejected TAI Storage

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Solution Overview

Problem

Existing wireless communication systems face issues with seamless connectivity and excessive power consumption due to frequent switching between 4G and 5G networks when a UE's request for accessing a network slice is rejected, leading to battery drain and service losses.

Innovation Solution

A method and UE implementation that aborts excessive switching by storing rejected Tracking Area Identifiers (TAIs) and establishing a connection with a 4G network upon rejection, enabling the N1 mode only after a timer expires or upon movement to a new tracking area, thereby reducing power consumption and maintaining seamless connectivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE continuously switches between 4G and 5G networks upon network slice rejection, then connectivity availability is improved, but power consumption increases significantly

Engineering Contradiction:

Improveconnectivity availabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The UE stores the rejected TAI in a rejected list before attempting further network switching. This preliminary action prevents redundant switching attempts to the same rejected tracking area, thereby reducing power consumption while maintaining connectivity availability by only allowing switches to non-rejected areas.

Inventive Principle:

Principle #10Preliminary action

2Use of energy by moving object

If the UE aborts excessive switching by storing rejected TAIs, then power consumption is reduced, but connectivity reliability may worsen if the UE remains stuck in 4G

Engineering Contradiction:

Improvepower consumptionVSAvoidconnectivity availability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The system dynamically manages the N1 mode based on timer expiration or movement to a new tracking area. When the timer expires or the UE moves to a non-rejected TA, the N1 mode is re-enabled, allowing the UE to attempt 5G network slice access again. This dynamic adjustment ensures connectivity reliability is maintained while preventing excessive switching to rejected areas.

Inventive Principle:

Principle #15Dynamics

3Adaptability or versatility

If the UE enables N1 mode continuously, then 5G network slice access is maximized, but excessive switching between 4G and 5G occurs

Engineering Contradiction:

Improvenetwork slice accessVSAvoidswitching frequency

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The UE performs a preliminary check against the rejected list before enabling N1 mode and attempting 5G network slice access. If the current TAI is in the rejected list, the N1 mode remains disabled, preventing switching to rejected areas. This preliminary filtering reduces unnecessary switching frequency while preserving adaptability to access 5G slices in non-rejected tracking areas.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11553408B2Method and user equipment for managing failure in registration for accessing network slice

Publication Date: 2023.01.10 SAMSUNG ELECTRONICS CO LTD

AI summary

A method performed by a User Equipment (UE) for managing a failure in a registration for accessing a network slice, and the UE including processing circuitry configured to perform the method, are provided. The method includes sending a registration request message to a first wireless network while the UE is in a tracking area of a registration area, the registration request message including a Single Network Slice Selection Assistance Information (S-NSSAI) corresponding to the network slice, receiving a registration reject message from the first wireless network indicating that the network slice is unavailable, storing a Tracking Area Identifier (TAI) of the tracking area to a rejected list based on the TAI of the tracking area being included the registration reject message, and establishing a connection with a second wireless network in response to the receiving.