UE Edge Service Failure Notification for Early EAS Departure Detection

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Solution Overview

Problem

Existing technologies fail to promptly detect when a terminal (UE) moves out of the service area of an edge application server (EAS) during real-time video transmission, leading to delayed detection of service interruptions.

Innovation Solution

A communication apparatus with a detection unit to identify the transition from a connected state to a failure state and a notification unit to alert the UE when such a transition occurs, using mechanisms like NAS messages or PDU SESSION MODIFICATION COMMANDs to notify the UE of service area departure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If SSC is used to maintain service continuity, then service continuity is improved, but detection of real-time data transmission failures is delayed

Engineering Contradiction:

Improveservice continuityVSAvoiddetection delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent introduces a notification mechanism as an intermediary between the network and UE. When the network detects that UE has moved out of EAS service area, it sends a notification message to UE proactively, rather than waiting for UE to detect communication failure. This intermediary notification system resolves the contradiction by enabling both service continuity (through SSC) and timely failure detection (through proactive notification).

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent implements preliminary action by notifying UE in advance before actual communication failure occurs. The network detects UE's movement out of service area and sends notification before real-time data transmission fails, allowing UE to take preventive actions (such as switching to another EAS or adjusting transmission parameters) to maintain service continuity while avoiding detection delays.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If SSC allows communication destination switching without terminal awareness, then service continuity is maintained, but terminal cannot detect service area departure

Engineering Contradiction:

Improveservice continuityVSAvoidservice area departure detection

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent implements a feedback mechanism where the network provides information back to UE about service area status. Through the notification message, the network feeds back to UE whether it has moved out of the EAS service area, compensating for UE's lack of awareness while maintaining SSC's service continuity benefits. This feedback loop resolves the information loss without compromising reliability.

Inventive Principle:

Principle #23Feedback

Data Source

PatentEP4697759A1Communication device, user equipment (UE), control method, and program

Publication Date: 2026.02.18 CANON KK

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AI summary

A communication apparatus relating to cellular communication detects a transition event in which a communication state between an edge application server and a user equipment (UE) transitions from a communication connected state to a communication failure state. In a case where the transition event has been detected by a detection unit, a predetermined notification is issued to the UE.