URSP Rule Priority Handling for Non-Subscribed SNPN Access
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Solution Overview
Problem
The existing methods for provisioning and handling UE Route Selection Policy (URSP) rules are unclear when a UE accesses a non-subscribed Stand-alone Non-public Network (SNPN) using credentials from a Credentials Holder (CH), leading to a lack of defined order for using URSP rules during PDU session establishment.
Innovation Solution
A method is provided where a UE registers to a non-subscribed SNPN using credentials from a CH, checks and stores URSP rules signaled by the SNPN, and applies them for PDU session establishment, with a priority order of signaled URSP rules from the SNPN, home network, and pre-configured rules if needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE uses existing URSP provisioning methods for subscribed networks, then URSP rules can be provided by HPLMN or SNPN, but the method is unclear when UE accesses non-subscribed SNPN using credentials from CH
Solution Approach 1:
The patent applies preliminary action by having the UE store URSP rules received from the non-subscribed SNPN during the registration phase, before PDU session establishment is needed. This ensures the URSP rules are readily available when the UE needs to establish PDU sessions, eliminating the uncertainty of rule provisioning in CH scenarios.
2Adaptability or versatility
If UE stores multiple sets of URSP rules from different networks, then URSP rules can be provided by HPLMN, SNPN, and non-subscribed SNPN, but the priority order for using these rules is not defined
Solution Approach 1:
The patent applies segmentation by dividing the URSP rule set into distinct categories with clear priority levels: (1) URSP rules from the registered non-subscribed SNPN using CH credentials, (2) URSP rules from HPLMN/VPLMN, and (3) pre-configured URSP rules. This segmented approach with defined priority order simplifies the management complexity while maintaining multi-network adaptability.
3Ease of operation
If UE follows standard URSP rule usage order for subscribed networks, then signaled URSP rules are used first, then pre-configured rules, but this order is not specified for non-subscribed SNPN access
Solution Approach 1:
The patent applies preliminary action by establishing a clear priority order for URSP rule application before PDU session establishment is attempted. The UE is configured to first apply URSP rules from the registered non-subscribed SNPN using CH credentials, then fall back to HPLMN/VPLMN URSP rules, and finally to pre-configured URSP rules. This predefined sequence ensures reliable PDU session establishment in non-subscribed SNPN scenarios.
Data Source
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AI summary
A method of handling UE Route Selection Policy (URSP) rules received from a non-subscribed Stand-alone Non-public Network (SNPN) registered using credentials from a credentials holder (CH) is provided. UE may be preconfigured with URSP rules by UE home network or UE may first registers to a home network and obtain signaled URSP rules from the home network. Later on, UE may register to a non-subscribed SNPN using credentials from a CH. Before establishing a PDU session, UE checks the corresponding URSP rules that can be used in the SNPN. If UE is signaled with URSP rules by the registered non-subscribed SNPN, then UE can use URSP rules in the following priority order : 1) URSP rules signaled from the non-subscribed SNPN, 2) URSP rules signaled from the home network, and 3) URSP rules preconfigured by the home network.