URSP Rule Priority Handling for Credentials Holder 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 unclear priorities for establishing PDU sessions.
Innovation Solution
A method is provided where a UE registers to a non-subscribed SNPN using credentials from a CH, checks for URSP rules, and applies them in a specific priority order: signaled rules from the SNPN, signaled rules from the home network, and pre-configured rules from the home network, ensuring proper PDU session establishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a UE accesses a non-subscribed SNPN using credentials from a CH, then the UE can register and access services in the SNPN, but the URSP rules for PDU session establishment are unclear and no provisioning method is defined
Solution Approach 1:
The network performs URSP rule provisioning in advance during the registration process, before the UE needs to establish PDU sessions. The AMF sends the URSP rules to the UE proactively, ensuring the UE has the necessary routing information ready before service access is needed.
Solution Approach 2:
The AMF acts as an intermediary between the SNPN and the UE for URSP rule provisioning. When the UE requests service, the AMF retrieves URSP rules from the PCF and forwards them to the UE, mediating the information flow that would otherwise be undefined in CH scenarios.
2Reliability
If URSP rules are provisioned for CH scenarios, then PDU session establishment becomes clear and functional, but the system complexity increases due to additional provisioning logic
Solution Approach 1:
The existing URSP provisioning mechanism is extended to handle CH scenarios universally. The same AMF-PCF-UE interaction model used for subscribed scenarios is reused for CH scenarios, allowing the system to handle multiple access types through a single unified provisioning pathway without duplicating logic.
Solution Approach 2:
The UE autonomously determines whether it is accessing a subscribed or non-subscribed SNPN and triggers the appropriate URSP provisioning request. The system uses self-service mechanisms where the UE initiates the provisioning based on its own state, reducing the need for complex network-side differentiation logic.
3Ease of operation
If the UE requests service in a non-subscribed SNPN, then service access is enabled, but without defined URSP provisioning the UE cannot properly establish PDU sessions
Solution Approach 1:
URSP rules are provisioned in advance during the service request or registration phase, before PDU session establishment is needed. This preliminary provisioning ensures that when the UE needs to establish PDU sessions, the routing rules are already available, eliminating delays and ensuring smooth service delivery.
Solution Approach 2:
The system implements feedback loops where the UE reports its service requirements and the network responds with appropriate URSP rules. The AMF monitors the UE's service requests and dynamically provisions URSP rules based on actual usage patterns, ensuring that routing information is both timely and relevant.
Data Source
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 pre-configured 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 pre-configured by the home network.