Dual-SIM URSP Switching for Reliable PDU Session Setup

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Solution Overview

Problem

In dual SIM scenarios, existing wireless communication technologies face challenges in ensuring that user equipment (UE) can successfully establish a PDU session, particularly when the initial connection attempt with a default subscriber identity module (SIM) is rejected, leading to suboptimal service provision despite premium subscription.

Innovation Solution

The UE is configured to attempt establishing a wireless connection via a second SIM if the initial attempt fails, utilizing user equipment route selection policy (URSP) rules to switch the default data subscriber (DDS) to a non-default SIM (nDDS) when all matched rules are rejected, enabling a PDU session establishment with parameters that meet the application's requirements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE attempts to establish a wireless connection via the default SIM only, then the connection establishment process is simple, but the service quality deteriorates when the default SIM is rejected

Engineering Contradiction:

Improveconnection establishment success rateVSAvoidconnection establishment process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The UE performs preliminary actions by pre-configuring multiple SIM cards and URSP rules before connection attempts. When the default SIM is rejected, the system has already prepared alternative SIMs and their corresponding routing policies, enabling immediate switching without complex real-time decision-making processes.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The URSP rules act as an intermediary mechanism between the application layer and the SIM selection process. These rules translate application requirements into specific routing decisions, automatically selecting the appropriate SIM card based on matched criteria without requiring complex manual intervention or sophisticated algorithms.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the UE switches to a non-default SIM when the default SIM is rejected, then the service quality improves, but the connection establishment process becomes more complex

Engineering Contradiction:

Improveservice provision reliabilityVSAvoidconnection establishment ease

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The UE performs self-service by automatically evaluating URSP rules and selecting the appropriate SIM card based on matched criteria. The system autonomously handles the switching process between default and non-default SIMs without requiring user intervention, maintaining ease of operation while improving service reliability.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system changes the SIM selection parameter dynamically based on URSP rule matching. When the default SIM is rejected, the UE modifies its behavior by selecting an alternative SIM card whose characteristics match the application's requirements according to the pre-configured URSP rules, thereby improving service provision without complicating the user experience.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the UE uses multiple SIMs for connection attempts, then the likelihood of successful connection improves, but the time required for connection establishment increases

Engineering Contradiction:

ImprovePDU session establishment success rateVSAvoidconnection establishment time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The UE performs preliminary actions by pre-configuring multiple SIM cards and their corresponding URSP rules before connection attempts. When the default SIM is rejected, the system has already prepared alternative SIMs and their routing policies, enabling rapid switching without time-consuming real-time analysis or user input.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The SIM selection process is made dynamic and adaptive. The UE automatically adjusts its connection strategy based on real-time network conditions and URSP rule matching, switching between default and non-default SIMs as needed. This dynamic approach optimizes connection establishment time by selecting the most appropriate SIM based on current application requirements and network status.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12477395B2Wireless communications by dual SIM device

Publication Date: 2025.11.18 QUALCOMM INC

AI summary

Aspects of the present disclosure provide a method for wireless communications by a user equipment (UE). The method generally includes receiving a request for a wireless connection from an application associated with one or more user equipment (UE) route selection policy (URSP) rules, attempting to establish the wireless connection for the application via a first subscriber identity module (SIM) according to one or more of the URSP rules associated with the application that are supported by the first SIM, and taking one or more actions to establish the wireless connection for the application via a second SIM if the attempt to establish the wireless connection for the application via the first SIM fails.