PDU Session Management for Disaster Roaming QoS Errors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods lack mechanisms to correct and prevent Quality of Service (QoS) errors during disaster roaming in 5G mobile communication systems, particularly when transferring Protocol Data Unit (PDU) sessions between 5GS and EPS networks, leading to incorrect parameter provisioning and potential service disruptions.
Innovation Solution
A method and apparatus for managing PDU session establishment in user equipment (UE) during disaster roaming, which involves determining the presence of Evolved Packet System (EPS) related QoS parameters in Non-Access Stratum (NAS) session management messages and deleting associated EPS bearer contexts if the session is not an emergency PDU session, ensuring accurate QoS handling and preventing erroneous transfers between 5GS and EPS modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the network provides EPS-related QoS parameters in NAS session management messages during disaster roaming, then the PDU session can be transferred between 5GS and EPS networks, but QoS errors occur when the session is not an emergency PDU session
Solution Approach 1:
The UE applies different handling rules for EPS-related QoS parameters based on the session type: for emergency PDU sessions, the parameters are retained and used for potential transfers, while for non-emergency sessions, the parameters are deleted to prevent errors. This localized differentiation resolves the contradiction by making the system adaptable for emergency transfers while maintaining reliability for normal sessions.
Solution Approach 2:
Instead of universally accepting EPS-related QoS parameters for all PDU sessions (which causes errors), the invention inverts the approach by selectively rejecting (deleting) these parameters for non-emergency sessions while preserving them for emergency sessions. This inversion prevents QoS errors in the common non-emergency case while maintaining transfer capability when needed.
2Ease of operation
If the UE accepts all EPS-related QoS parameters during disaster roaming, then mode transfer between 5GS and EPS is enabled, but incorrect parameter provisioning leads to service disruptions
Solution Approach 1:
The UE performs a preliminary check of the session type (emergency or non-emergency) before accepting EPS-related QoS parameters. By deleting these parameters in advance for non-emergency sessions, the system prevents incorrect parameter provisioning that would lead to service disruptions, while maintaining the capability for smooth mode transfer in emergency scenarios.
3Adaptability or versatility
If the network sends EPS bearer context information for all PDU sessions, then interworking between 5GS and EPS is supported, but erroneous QoS parameter provisioning occurs for non-emergency sessions
Solution Approach 1:
The invention applies local quality by differentiating parameter handling based on session characteristics: EPS bearer context information is retained for emergency PDU sessions to enable interworking, while being deleted for non-emergency sessions to prevent provisioning errors. This selective approach maintains interworking adaptability where needed while ensuring parameter correctness elsewhere.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method for managing Protocol Data Unit, PDU, session establishment, by a user equipment, UE, connected to a network for disaster roaming is disclosed. The method comprises receiving a Non Access Stratum, NAS, session management message from the network; determining whether the NAS session management message includes an Evolved Packet System, EPS, related Quality of Service, QoS, parameter, and whether a session related to the NAS session management message is an emergency PDU session; and deleting an associated EPS bearer context based on determining that the NAS session management message includes the EPS related QoS parameter, and the session is not the emergency PDU session.