SoR Indication Parameter for 5G Roaming Registration
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Solution Overview
Problem
Current Steering of Roaming (SoR) methods in 5G mobile communication networks are prone to 'Replay Attack' scenarios, where a User Equipment (UE) may not receive updated SoR information, leading to inefficient network redirection and data management, especially when a UE has already registered with a Visiting Public Land Mobile Network (VPLMN).
Innovation Solution
Introducing a new indication parameter at the Home Public Land Mobile Network's (HPLMN) Unified Data Management function to inform the VPLMN's Access and Mobility Management function about the need for updated SoR information during subsequent registration requests, ensuring that the UE receives the latest network connection details based on registration type, thereby optimizing signaling between network functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the VPLMN uses SoR information from a previous registration for subsequent registration requests, then signaling between network functions is reduced, but the UE may not receive updated SoR information from the HPLMN
Solution Approach 1:
The HPLMN proactively provides an indication parameter during the initial registration that specifies whether the VPLMN should request updated SoR information for subsequent registrations. This preliminary action allows the VPLMN to make informed decisions about requesting updates without continuous HPLMN involvement, reducing signaling while ensuring information freshness when needed.
Solution Approach 2:
The indication parameter acts as a feedback mechanism from the HPLMN to the VPLMN, guiding the VPLMN's behavior regarding SoR information requests. The VPLMN uses this feedback to determine whether to request updated SoR information for each subsequent registration, balancing signaling reduction with information currency.
2Reliability
If the VPLMN requests updated SoR information for every subsequent registration, then the UE receives the latest SoR information, but signaling between network functions increases
Solution Approach 1:
The HPLMN pre-configures the VPLMN with an indication parameter that specifies under what conditions updated SoR information should be requested. This preliminary configuration simplifies subsequent interactions by providing clear guidance, reducing the need for complex real-time decision-making and excessive signaling.
Solution Approach 2:
The indication parameter provides dynamic control over SoR information update behavior. By changing this parameter, the HPLMN can adjust the balance between information validity and signaling complexity based on operational requirements, allowing flexible optimization without system redesign.
3Adaptability or versatility
If the HPLMN provides SoR information for each registration type separately, then the UE receives precise network redirection instructions, but the system complexity increases
Solution Approach 1:
The solution segments SoR information management by registration type, providing specific indication parameters for different registration scenarios (Initial Registration, Emergency Registration, Mobility Registration Update, Periodic Registration Update). This segmentation allows precise control for each registration type while maintaining a unified framework that prevents excessive complexity.
Solution Approach 2:
Different indication parameter values can be applied to different registration types based on local requirements. Each registration type can have customized SoR information update behavior tailored to its specific needs, allowing optimized data management without requiring a completely separate system for each registration type.
Data Source
AI summary
Methods and devices provide for enhancements to the Steering of Roaming (SoR) provisioning during the registration procedure by introducing a new parameter generated by a user data management network function of the home network which indicates to roaming networks whether to request updated SoR information based on a registration type received in a registration request from a mobile terminal.