Access Selection Method Resolving Routing Policy Collisions
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Solution Overview
Problem
In the context of 3GPP mobile communication systems, the existing access selection methods face challenges in resolving collisions between inter-APN routing policies (IARP) and inter-system routing policies (ISRP), leading to ambiguity in selecting the optimal IP interface for data offloading, especially when operator preferences conflict during roaming.
Innovation Solution
The proposed solution involves an access selection method that includes selecting a first APN not supporting IP flow mobility and seamless offload (IFOM) based on APN-based routing configurations, checking a preferred flag to handle collisions between IARP and ISRP configurations, and using either configuration based on the flag to ensure clear policy application, thereby resolving conflicts and ensuring intended operator policies are accurately applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple routing configurations (IARP and ISRP) are provided for access selection, then routing flexibility and operator policy support are improved, but configuration collision and selection ambiguity occur
Solution Approach 1:
The patent applies preliminary action by introducing a 'preferred flag' configuration that pre-determines which routing configuration (IARP or ISRP) takes precedence before the collision actually occurs. This flag is set in advance by the network operator to indicate the preferred routing configuration, allowing the UE to automatically resolve conflicts without complex real-time decision-making logic.
Solution Approach 2:
The patent uses the 'preferred flag' as an intermediary element that mediates between the two routing configurations (IARP and ISRP). This flag acts as a mediator that translates the operator's policy intent into a clear selection rule, eliminating the need for the UE to independently resolve the conflict between multiple valid routing configurations.
2Loss of time
If automatic access selection is implemented without clear collision resolution rules, then selection speed is improved, but policy application accuracy deteriorates
Solution Approach 1:
The preferred flag is configured in advance by the network operator to establish clear selection rules before the UE needs to make access selection decisions. This preliminary configuration ensures that when collisions occur between IARP and ISRP configurations, the UE can immediately apply the pre-determined preference rule without delay, maintaining both fast selection speed and accurate policy application.
Data Source
AI summary
An example of the present disclosure provides a method of selecting access. The method of selecting access may include the steps of: selecting a first access point name (APN) that does not support IP flow mobility and seamless offload (IFOM) according to a first setting related to APN-based routing; checking a preferred flag when wireless local area network (WLAN) access for the IFOM is selected according to a second setting related to routing resulting in a collision between the first setting and the second setting; and using any one of the first setting and the second setting according to the preferred flag.