UE SUCI Failure Handling for Network Registration
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Solution Overview
Problem
Current techniques for transitioning between 5G standalone (SA) and non-5G wireless communication networks are inefficient, leading to prolonged out-of-service states and poor user experience due to repeated registration attempts and SUCI calculation failures.
Innovation Solution
A method where a user equipment (UE) triggers a second registration procedure in a non-5G network upon detecting a first failure instance of the SUCI calculation in the 5G SA network, modifying the RAT priority list to prevent further attempts on the 5G SA network and immediately registering with the non-5G network, and updates the priority list once the SIM is upgraded to support 5G SA.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE repeatedly attempts SUCI calculation in the 5G SA network upon failure, then the UE maintains priority for 5G SA network registration, but the UE remains in out-of-service state for prolonged periods
Solution Approach 1:
The patent applies preliminary action by detecting SUCI calculation failure and proactively switching to non-5G network registration before the UE fully enters out-of-service state. The UE monitors SUCI calculation status and immediately initiates fallback to non-5G networks (such as E-UTRAN or NR non-standalone) when failure is detected, preventing prolonged out-of-service periods while maintaining reliable network connectivity
Solution Approach 2:
The patent implements dynamics by making the network selection process adaptive and flexible. The UE dynamically adjusts its registration strategy based on SUCI calculation success or failure, switching between 5G SA and non-5G networks as conditions change. This dynamic approach allows the UE to optimize between maintaining 5G SA priority and minimizing out-of-service time based on real-time network conditions
2Loss of time
If the UE immediately switches to non-5G network upon first SUCI calculation failure, then the out-of-service time is reduced, but the complexity of network management increases
Solution Approach 1:
The patent reduces out-of-service time by implementing preliminary failure detection and immediate fallback to non-5G networks. When SUCI calculation failure is detected, the UE proactively initiates registration with non-5G networks without waiting for repeated failure cycles, thereby minimizing the duration of out-of-service state while managing complexity through predefined fallback procedures
Solution Approach 2:
The patent applies self-service by enabling the UE to autonomously detect SUCI calculation failures and independently switch to non-5G network registration without requiring complex external coordination. The UE's own failure detection mechanisms trigger automatic network switching, reducing the need for sophisticated network-side management while minimizing out-of-service time
Data Source
AI summary
Wireless communication techniques that include network service discovery and selection techniques in wireless communication systems are discussed. A UE may trigger a first subscription concealed identifier (SUCI) calculation associated with a first registration procedure. The first registration procedure may be used to register the UE in a first wireless communication network associated with a first radio access technology (RAT). The UE may also trigger a second registration procedure to register the UE in a second wireless communication network associated with a second RAT upon detecting a first failure instance of the first SUCI calculation. Other features are also described.