NSSF-Mediated UE Context Transfer for 5G AMF Re-allocation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing registration procedures with the Accessibility and Mobility Management Function (AMF) in 5G networks face security flaws, leading to registration failures during idle mobility and AMF re-allocation, particularly when the initial AMF and UE establish a new NAS security context different from the old AMF, causing integrity check failures.
Innovation Solution
The proposed solution involves a system and method where the Network Slice Selection Function (NSSF) receives a UE context from an initial AMF, generates a UE context identifier, associates it with the UE context, and transmits it to a target AMF, facilitating AMF re-allocation based on network slice selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the initial AMF and UE establish a new NAS security context different from the old AMF, then security is improved, but registration reliability deteriorates due to integrity check failures
Solution Approach 1:
The NSSF acts as an intermediary between the AMF and UE context management. It receives the UE context from the initial AMF, generates a UE context identifier, and forwards it to the target AMF. This intermediary role ensures that the security context is properly transferred and recognized across AMF re-allocation, preventing integrity check failures while allowing security context updates.
Solution Approach 2:
The NSSF performs preliminary actions by receiving and validating the UE context before the AMF re-allocation is complete. It generates the UE context identifier in advance and associates it with the UE context, ensuring that the target AMF will have the necessary security context information ready before the handover occurs, thus maintaining registration reliability.
2Adaptability or versatility
If AMF re-allocation is performed during idle mobility, then mobility management flexibility is improved, but registration failure risk increases due to security context mismatches
Solution Approach 1:
The NSSF serves as a mediator that maintains UE context information during AMF re-allocation in idle mobility scenarios. By storing the UE context and generating a persistent UE context identifier that is transferred to the target AMF, it ensures that security contexts are properly matched even when the AMF changes, thus maintaining registration success rates while enabling mobility flexibility.
Solution Approach 2:
Before the AMF re-allocation is finalized, the NSSF performs preliminary validation and preparation of the UE context. It ensures that the security context information is ready and correctly associated with the UE context identifier, so that when the target AMF receives the context, the security mismatch problem is already resolved, enabling successful registration during idle mobility.
3Measurement precision
If the NSSF generates and manages UE context identifiers, then context transfer accuracy is improved, but system complexity increases
Solution Approach 1:
The NSSF performs multiple functions within a single network element: it receives UE context from the initial AMF, generates UE context identifiers, associates identifiers with contexts, and forwards information to the target AMF. This multi-functionality approach improves context transfer accuracy by centralizing the process while avoiding the need for additional separate components, thus limiting the increase in system complexity.
Data Source
AI summary
Presented are systems and methods for acquiring channel state information. A wireless communicate node may transmit a channel state information reference signal (CSI-RS) to a wireless communication device via a first antenna port of a plurality of antenna ports of the wireless communication node. The wireless communication node may receive a channel state information (CSI) report from the wireless communication device.