5G LADN Connectivity Error Handling via Cause Value Segmentation
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Solution Overview
Problem
In the 5G System, there is a lack of clear distinction between error processing performed by the control device and user equipment when connectivity to a Local Area Data Network (LADN) cannot be provided, leading to inefficiencies in error handling.
Innovation Solution
The User Equipment and control device implement a procedure where a 5GS Session Management cause value is included in a PDU session establishment reject message, allowing the UE to recognize invalid LADN attempts and initiate registration procedures, while the control device performs mobility and registration updates to provide new LADN information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control device and user equipment do not clearly distinguish error processing procedures, then the system architecture remains simple, but error handling efficiency and reliability deteriorate
Solution Approach 1:
The patent segments the error processing procedures into distinct control device-side processing (embodiment 1) and user equipment-side processing (embodiction 2). The control device performs procedures related to PDU session establishment rejection and cause value handling, while the user equipment performs procedures related to LADN validity determination and registration procedure initiation. This segmentation resolves the technical contradiction by improving error handling reliability through clear procedural distinction while avoiding unnecessary system complexity.
2Reliability
If LADN connectivity issues are not clearly differentiated, then the communication protocol remains simple, but service provision reliability deteriorates
Solution Approach 1:
The patent applies local quality by handling different LADN connectivity scenarios with differentiated processing logic. Specifically, the system distinguishes between cases where the user equipment is inside versus outside the LADN service area, and between different 5GSM cause values (e.g., cause value 6 indicating outside service area versus other cause values). This localized differentiation improves service provision reliability by ensuring appropriate error processing for each specific scenario while maintaining manageable operational complexity through structured handling.
3Productivity
If error processing procedures are not clearly defined, then the system architecture remains simple, but communication efficiency deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where the control device includes specific 5GSM cause values in PDU session establishment reject messages to provide detailed error information to the user equipment. The user equipment then uses this feedback information to determine whether to initiate a registration procedure or other appropriate actions. This feedback mechanism improves communication efficiency by enabling precise error handling and rapid recovery while maintaining reasonable procedural complexity through standardized cause value definitions.
Data Source
AI summary
Provided is a communication unit for implementing error processing of a control device of a core network and error processing of User Equipment in a case that connectivity to a Local Area Data Network (LADN) is not able to be provided in a 5GS. Provided is a communication unit for implementing error processing in which a request for establishing connectivity to a Local Area Data Network (LADN) requested by a user equipment is rejected by a control device of a core network in a case that the connectivity to the LADN is not able to be provided in a 5GS. Further, a communication unit for implementing appropriate error processing that User Equipment performs in a case that a request for establishing connectivity to the LADN is rejected.