Dual-Subscription PDU Session Establishment via URSP Matching
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Solution Overview
Problem
In wireless communications systems, a UE with dual subscriptions often fails to establish connections via the subscription that provides higher quality of service due to mismatched access preference rules with the default subscription's URSP policies, leading to suboptimal data connections.
Innovation Solution
The UE identifies and evaluates the URSP policies of both subscriptions to find a match for the access preference rule, allowing it to switch to the subscription providing better service quality, optionally prompting the user for confirmation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE establishes a data connection via the default subscription without evaluating URSP policies of non-default subscriptions, then the connection establishment process is simple and fast, but the UE may fail to utilize the subscription that provides higher quality of service
Solution Approach 1:
The UE performs preliminary evaluation of URSP policies for both default and non-default subscriptions before establishing the data connection. By evaluating policies in advance and identifying matching access preference rules, the UE ensures that the selected subscription provides optimal quality of service without delaying the connection establishment process.
2Reliability
If the UE evaluates URSP policies of multiple subscriptions to find the best match for access preference rules, then the quality of service is optimized, but the complexity of the connection establishment process increases
Solution Approach 1:
The policy evaluation process is segmented into distinct steps: first evaluating URSP policies of the default subscription, then conditionally evaluating URSP policies of non-default subscriptions only when needed. This segmentation reduces overall complexity by avoiding unnecessary evaluations while ensuring optimal quality of service when required.
Solution Approach 2:
The UE applies different evaluation depths to different subscriptions based on their role. The default subscription receives full evaluation, while non-default subscriptions receive evaluation only when the access preference rule does not match the default subscription's policies. This localized approach optimizes quality of service without uniformly increasing complexity across all subscriptions.
3Reliability
If the UE automatically switches the default subscription to a non-default subscription when a matching policy is found, then the quality of service is improved, but the user loses control over subscription selection
Solution Approach 1:
The system incorporates user feedback by prompting the user when a matching policy is found in a non-default subscription. The user can confirm or cancel the automatic switch, ensuring that the final subscription selection aligns with user preferences while still benefiting from automated policy evaluation and recommendation.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may identify that it is operating in a dual-subscription mode that includes a first subscription and a second subscription. In some cases, the UE may include an application that is requesting to establish a data connection in accordance with an access preference rule for the application. The UE may determine that the access preference rule lacks a match among policies of a first route selection policy associated with the first subscription (e.g., a default subscription). The UE may then evaluate a second route selection policy associated with the second subscription for a policy that matches the access preference rule based on determining the lack of the match among policies of the first route selection policy. The UE may establish the data connection after evaluating the second route selection policy for the matching policy.