UE AKMA Key Synchronization via Autonomous Re-registration
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Solution Overview
Problem
In 5G networks, synchronization issues between User Equipment (UE) and AKMA Anchor Function (AAnF) keys lead to failures in establishing application sessions due to asynchronous UE parameter updates, particularly when the Routing Indicator is updated without re-registration requests.
Innovation Solution
A method and apparatus that autonomously initiate re-registration of AKMA keys using a new routing indicator value without a re-registration request, by setting or deleting the AKMA context and keys, ensuring synchronization between UE and AAnF.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UDM function updates the routing indicator value without requesting re-registration, then the network can efficiently update routing information, but the UE and AAnF keys become asynchronous leading to session establishment failures
Solution Approach 1:
The UE monitors incoming UDM requests and detects when a routing indicator update occurs without a re-registration request. This feedback mechanism triggers the UE to autonomously initiate re-registration, ensuring key synchronization between UE and AAnF while maintaining efficient routing updates.
Solution Approach 2:
The UE autonomously detects the asynchronization condition and self-corrects by initiating re-registration without external intervention. This self-service approach resolves the key synchronization issue while maintaining the efficient update procedure initiated by the network.
2Reliability
If the UE autonomously initiates re-registration upon detecting routing indicator update, then key synchronization is maintained, but additional signaling overhead is introduced
Solution Approach 1:
The UE proactively initiates re-registration upon detecting the specific condition of routing indicator update without re-registration request, preventing potential session establishment failures before they occur. This preliminary action ensures key synchronization is maintained while avoiding the need for corrective actions later.
3Reliability
If the UE sets AKMA context as invalid and deletes keys, then key asynchronization is prevented, but security context must be re-established
Solution Approach 1:
The UE performs the necessary actions of setting AKMA context as invalid and deleting keys as a preliminary step before initiating re-registration. This ensures that stale security context is cleared in advance, preventing any potential asynchronization issues during the re-registration process and enabling smooth key re-establishment.
Data Source
AI summary
An apparatus comprising means for obtaining a subscription permanent identifier for said apparatus in a primary authentication process; means for obtaining a root session key; means for generating an Authentication and Key Management for Applications (AKMA) key based on said root session key; means for generating a temporary identifier for the AKMA key at least partly based on a first routing indicator value obtained from a Unified Data Management (UDM) function; means for initiating, in response to receiving a request from the UDM function to update the temporary identifier for the AKMA key using a second routing indicator value without a request to re-register the temporary identifier for the AKMA key updated based on the second routing indicator value, a re-registration process of the temporary identifier for the AKMA key using at least said subscription permanent identifier and the second routing indicator value.