Rerouting NAS Messages via AMF Capability Check
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Solution Overview
Problem
In wireless communication networks, security setup between a user equipment (UE) and an access and mobility management function (AMF) can fail if the AMF is not capable of serving the UE, leading to registration failures and inefficient rerouting of message transmissions.
Innovation Solution
The method involves delaying primary authentication and security setup based on subscription permanent identifier (SUPI) and subscription information, and determining whether to transmit a reroute non-access stratum (NAS) message, allowing for rerouting of message transmissions through a reallocated AMF capable of serving the UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If security setup is performed immediately between UE and AMF, then security establishment speed is improved, but registration failure occurs when AMF is not capable of serving the UE
Solution Approach 1:
The patent applies preliminary action by checking AMF capability to serve the UE before performing security setup. The first network device determines whether the AMF can serve the UE based on SUPI and subscription information, and only then proceeds with security setup. This prevents registration failures by ensuring the AMF is capable before committing to security establishment.
2Reliability
If AMF reallocation is performed to ensure serving capability, then registration success rate is improved, but message transmission delay increases
Solution Approach 1:
The patent performs AMF capability checking in advance before security setup, allowing proactive identification of unsuitable AMFs. This enables timely reroute NAS message transmission to appropriate AMFs, reducing overall registration time compared to reactive reallocation after security setup failure.
Solution Approach 2:
The patent introduces a reroute NAS message as an intermediary mechanism to transfer UE context from the first network device to a second network device. This allows seamless handover to a capable AMF without complete registration restart, minimizing message transmission delay while ensuring registration success.
3Reliability
If security context is obtained from fourth network device, then security setup reliability is improved, but network device complexity increases
Solution Approach 1:
The patent uses the fourth network device as an intermediary to provide security context information to the third network device. This distributed approach allows security context to be obtained from a specialized authentication function, improving security setup reliability while maintaining individual device simplicity through clear interface definitions.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for rerouting message transmissions. One method includes receiving, at a first network device, a registration request message. The method includes delaying, by the first network device, primary authentication, security setup, or a combination thereof based at least partly on a subscription permanent identifier (SUFI) from a second network device and subscription information. The method includes determining, at the first network device, whether to transmit a reroute non-access stratum (NAS) message.