UE GUTI Selection for SNPN Registration Security
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Solution Overview
Problem
The existing methods for Standalone Non-Public Network (SNPN) registration in wireless mobile communication networks face challenges in efficiently selecting a suitable Global Unique Temporary Identity (GUTI) for secure and private communication, particularly in distinguishing between globally-unique and non-global-unique SNPN identities.
Innovation Solution
The proposed solution involves user equipment (UE) maintaining a set of previously assigned GUTIs and selecting a registration GUTI based on specific selection rules that prioritize GUTIs from equivalent SNPNs with globally-unique SNPN IDs over those with non-global-unique SNPN IDs, and further prioritizing GUTIs based on globally-unique SNPN identities, subscriber concealed identifiers, and permanent equipment identifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE uses a simple GUTI selection method without considering SNPN ID uniqueness, then the registration process is faster and simpler, but registration ID mix-up occurs and security is compromised
Solution Approach 1:
The patent changes the selection parameter from simple GUTI matching to a hierarchical parameter set: first checking if the GUTI was assigned by an equivalent SNPN, then verifying the SNPN ID global uniqueness status. This parameter transformation enables reliable security differentiation without requiring complex algorithms, just structured comparison of assignment identity and ID uniqueness attributes.
Solution Approach 2:
The GUTI selection process is segmented into distinct evaluation stages: (1) identify GUTIs assigned by equivalent SNPNs, (2) determine whether those SNPNs have globally-unique IDs, (3) prioritize based on global uniqueness status. This segmentation transforms a potentially complex security problem into a series of simple, sequential decisions that maintain reliability while controlling complexity.
2Reliability
If the UE prioritizes GUTIs from SNPNs with globally-unique SNPN IDs, then registration security and correctness are improved, but the selection process becomes more complex
Solution Approach 1:
The UE performs preliminary organization of GUTIs by assigning them to categories based on their SNPN assignment identity and global uniqueness status before the actual selection moment. By pre-grouping GUTIs into 'equivalent SNPN with global ID,' 'equivalent SNPN without global ID,' and 'non-equivalent SNPN' categories, the selection process becomes a simple lookup rather than a complex real-time analysis, reducing selection time while maintaining accuracy.
3Measurement precision
If the UE maintains detailed records of all GUTIs and their assigning SNPN characteristics, then GUTI selection accuracy is improved, but memory requirements and device complexity increase
Solution Approach 1:
The patent extracts only the essential identifying attributes needed for accurate GUTI selection: the SNPN assignment identity and the global uniqueness status flag. Rather than storing complete SNPN configuration records or full identity profiles, the UE maintains minimal metadata links between each GUTI and these two critical attributes. This extraction maintains measurement precision while dramatically reducing the quantity of stored information.
Data Source
AI summary
Methods and apparatus are provided for mobile identity selection for SNPN initial registration. In one novel aspect, the UE selects a GUTI as a registration GUTI for registration with a current SNPN based on one or more selection rules. The UE indicates the selected registration GUTI in a 5GS mobile identity information element (IE) and includes the NID of the corresponding prior SNPN in an NID IE. The selection rules include prioritizing a GUTI previously assigned by an equivalent SNPN or any other SNPN with a globally-unique SNPN ID over a GUTI previously assigned by an equivalent SNPN or any other SNPN with a non-global-unique SNPN ID; and prioritizing a GUTI previously assigned by an equivalent SNPN over a GUTI previously assigned by any other SNPN when the equivalent SNPN and the any other SNPN are both identified by a globally-unique SNPN identity.