5G PDU Session Rerouting for Data Flow Continuity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing 5G communication networks face issues with data traffic interruptions due to congestion, insufficient user-plane resources, and lower layer failures, leading to delayed PDU session establishment and service disruptions.
Innovation Solution
Implement methods and systems to detect congestion and lower layer failures, establish PDU sessions with alternative DNNs and network slices, and route data traffic through 4G networks when 5G resources are insufficient, ensuring data traffic continuity by establishing high priority PDU sessions or PDN connections with 4G networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the 5G network establishes PDU sessions with specific DNNs and network slices, then data traffic can be routed through optimized 5G paths, but service interruptions occur when congestion or resource shortages occur in those specific DNNs or slices
Solution Approach 1:
The system dynamically switches routing paths based on real-time network conditions. When congestion or resource shortages are detected in the primary 5G PDU session, the system automatically transitions to alternative routing options (different DNNs, network slices, or 4G networks), making the routing flexible and adaptive rather than static.
Solution Approach 2:
The system changes routing parameters (DNN, network slice selection, or network type) in response to detected network conditions. By monitoring congestion indicators and resource availability, the system modifies the routing parameters to select alternative paths that can maintain service continuity when primary parameters become unsuitable.
2Loss of energy
If the UE refrains from sending further PDU session establishment requests for a predefined time period after receiving a reject message, then network congestion is mitigated, but user services are blocked during this delay period
Solution Approach 1:
Instead of waiting for the back-off timer to expire before taking action, the system performs preliminary routing actions during the timer period. It proactively establishes alternative PDU sessions with different DNNs or network slices, or switches to 4G networks, thereby maintaining service continuity without having to wait for the congestion mitigation period to end.
Solution Approach 2:
The system introduces intermediary routing options (alternative DNNs, network slices, or 4G networks) that act as mediators between the UE and the congested 5G network. These intermediaries allow traffic to flow through alternative paths while the primary network recovers, preventing direct confrontation with the congested resources.
3Stability of the object's composition
If the 5G network uses timers to block user services after PDU session establishment failure, then resource allocation is stabilized, but data traffic continuity is interrupted until the timer expires
Solution Approach 1:
The system makes the service duration dynamic by maintaining continuity through alternative routing. While the 5G network imposes static timer-based blocking on failed PDU sessions, the system dynamically switches to alternative paths (different DNNs, slices, or 4G networks), thereby extending the effective service duration beyond what the timer would normally allow.
4Reliability
If the UE establishes PDU sessions with alternative DNNs and network slices upon detecting congestion, then service continuity is maintained, but device complexity increases due to multiple session management requirements
Solution Approach 1:
The system implements self-service mechanisms where the UE autonomously monitors network conditions, detects congestion indicators in reject messages, and independently makes routing decisions. This self-service capability reduces the need for complex external coordination and simplifies the overall management of multiple sessions, as the device handles the complexity locally through automated decision-making.
Data Source
AI summary
Methods and/or systems for managing continuity of data flow in 5G networks. A UE may receive a message from a 5G network in response to a PDU session establishment request. The message indicates a failure to establish a PDU session with a first DNN and a first network slice. A PDU session may be established with at least one of a second DNN and a second network slice, if the PDU session is matching with a route selection descriptor applicable to data traffic to be routed through the PDU session. A non-CIoT device may receive a message from a 5G network in response to a service request. The message may indicate failure of a service request procedure, pertaining to a PDU session, such as due to insufficient user-plane resources. The PDU session may be closed and reestablished. If there is lower layer failure in 5G, a connection may be established with a 4G network for data transfer.