UE PDU Session Continuity in Congested Network Slices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is no obvious implementation method for satisfying the demands of continuing PDU sessions in a network slice when it is congested, or when network performance does not meet service level agreements, especially in scenarios with mobility.
Innovation Solution
A User Equipment (UE) that includes a transmission and/or reception unit and a controller, capable of receiving a PDU session modification command message with S-NSSAI, transmitting the S-NSSAI and a PDU session establishment request message, and establishing a second PDU session while releasing the first PDU session.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PDU session is established in a network slice, then network service is provided, but when the network slice becomes congested or performance does not meet SLA, the service cannot be continued
Solution Approach 1:
The patent implements dynamic PDU session management by enabling the UE to establish a second PDU session when the first session encounters congestion or performance issues in the network slice. The system transitions from static single-session establishment to dynamic multi-session management, allowing flexible adaptation to changing network conditions and ensuring service continuity through conditional session establishment and release mechanisms.
2Reliability
If network slicing is implemented for specific services, then service quality is improved, but implementation complexity increases
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously manage PDU sessions based on network conditions. The UE automatically establishes second PDU sessions when congestion or performance issues are detected, and releases first sessions accordingly, without requiring complex centralized control or manual intervention. This distributed self-management approach simplifies the overall implementation while maintaining high service quality through network slicing.
3Reliability
If PDU session modification is performed to continue service, then service continuity is maintained, but network resources are consumed
Solution Approach 1:
The patent implements a resource-efficient approach by establishing a second PDU session only when the first session needs to be released due to congestion or performance issues. The system discards the problematic first session and recovers service continuity through the second session, avoiding the need to maintain multiple concurrent sessions simultaneously. This selective session management minimizes network resource consumption while ensuring service continuity only when necessary.
Data Source
AI summary
In 5GS, provided is a communication unit for continuing services of a PDU session in a network slice in a case that the network slice is congested, a case that network performance of the network slice does not satisfy an SLA, or the like. In 5GS, provided are a method and a communication unit for a PDU session modification procedure, and/or a PDU session release procedure, and/or a PDU session establishment procedure, and/or a PDU session anchor change procedure, for implementing session and/or service continuity by changing a slice and changing PDU session anchor, in a case that a network slice is congested, a case that network performance of the network slice does not satisfy an SLA, or the like.