5G User Device LADN PDU Session Error Handling
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Solution Overview
Problem
In a 5G System (5GS), there is a lack of effective error handling mechanisms for connectivity issues with Local Area Data Networks (LADN), particularly when connectivity cannot be provided or modified, affecting both control devices and user devices.
Innovation Solution
A method involving a user device and a control device that establish a Protocol Data Unit (PDU) session using an LADN Data Network Name (DNN) and prohibit PDU session modification requests based on specific cause values, ensuring error handling in cases of unavailability or modification issues with LADN connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connectivity to LADN is not provided or cannot be modified, then error handling procedures are unclear for both control device and user device, but the patent introduces specific cause values and prohibition mechanisms to clarify error handling
Solution Approach 1:
The patent introduces specific cause value parameters in PDU session modification procedures to indicate when PDU session modification request messages are prohibited. By changing the parameter state (cause value indication), the system provides clear error handling without requiring complex procedural changes, thus improving reliability while maintaining procedural simplicity.
2Adaptability or versatility
If PDU session modification is allowed without restrictions, then user flexibility is improved, but system reliability deteriorates when LADN connectivity cannot be provided
Solution Approach 1:
The patent applies preliminary anti-action by prohibiting PDU session modification request messages through cause value indications before connectivity issues occur. The control device preemptively restricts modification capabilities when LADN connectivity cannot be provided, preventing potential errors while maintaining user flexibility for valid modification scenarios.
3Reliability
If error handling mechanisms are added to the 5GS for LADN connectivity issues, then system reliability is improved, but the complexity of the communication procedure increases
Solution Approach 1:
The patent extracts the error handling logic from complex procedural negotiations and encapsulates it in specific cause value parameters within existing PDU session modification messages. By taking out the error indication functionality and embedding it in standardized parameters, the system improves reliability without significantly increasing procedure complexity.
Data Source
AI summary
A user device for implementing error handling is provided. The user device comprises a control unit that establishes, in a Protocol Data Unit (PDU) session establishment procedure using a Local Area Data Network (LADN) Data Network Name (DNN), a PDU session for the LADN; and a transceiver unit that prohibits transmission of a PDU session modification request message for the PDU session, in a PDU session modification procedure, based on reception of a specific cause value, wherein the LADN DNN is provided by the user device in the PDU session establishment procedure.