Network Function Redundant PDU Session Validation
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Solution Overview
Problem
Current 5G networks face challenges in efficiently managing redundant Protocol Data Unit (PDU) sessions, leading to resource exhaustion and repeated requests due to lack of clear failure information, as User Equipment (UE) initiates redundant user plane redundancy without network validation, resulting in undesired resource usage and signaling overhead.
Innovation Solution
A network-based solution that determines redundant PDU session establishment based on network conditions such as load and Quality of Service (QoS) support, providing clear failure indications to the UE and validating redundancy requests to prevent resource exhaustion, using a mechanism that involves the Session Management Function (SMF) and Network Data Analytics Function (NWDAF) for monitoring and analytics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE initiates redundant PDU session establishment without network validation, then redundancy reliability is improved, but network resource exhaustion and signaling overhead increase
Solution Approach 1:
The network function provides feedback to the UE regarding the outcome of redundant PDU session establishment requests. The network validates whether redundant sessions should be established and communicates this decision back to the UE, preventing unauthorized resource consumption while maintaining reliability where appropriate.
Solution Approach 2:
The network function performs preliminary validation and determination before allowing redundant PDU session establishment. By assessing network conditions and redundancy requirements in advance, the network prevents unnecessary session creations that would consume resources, while ensuring reliability is maintained when conditions warrant redundancy.
2Reliability
If UE repeatedly requests redundant PDU sessions without clear failure information, then redundancy reliability is improved, but signaling overhead increases
Solution Approach 1:
The network function sends clear feedback information to the UE indicating whether a redundant PDU session was established or rejected, and provides reasons for rejection when applicable. This feedback mechanism prevents the UE from repeatedly initiating requests that will fail, reducing unnecessary signaling overhead while maintaining reliability through informed decision-making.
3Productivity
If network function validates and controls redundant PDU session establishment, then network resource efficiency is improved, but device complexity increases
Solution Approach 1:
The network function acts as an intermediary between the UE and the redundant PDU session establishment process. It receives requests from the UE, performs validation and determination based on network conditions, and communicates outcomes back to the UE. This intermediary role centralizes control logic in the network, improving resource efficiency while managing complexity within the network infrastructure rather than at the UE.
Data Source
AI summary
A network function configured for operation in a mobile telecommunications network is provided. The network function is configured to obtain from a User Equipment (UE), a Protocol Data Unit, PDU, session request for establishment of a redundant PDU session and to determine said redundant PDU session to be established based on at least one network condition. The network function is configured to provide the UE the outcome of the determination if said redundant PDU session is to be established. Hereby a network function that can consider Network conditions to determine (initiate/reject) the redundant user plane feature for the URLLC services can be provided. By allowing the network to determine establishment of redundant user plane resource exhaustion can be avoided in that the UE is no longer controlling the establishment of a redundant user plane.