ANDSF Policy Update Logic in Wireless Communication Systems
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Solution Overview
Problem
The challenge in updating the Access Network Discovery and Selection Functions (ANDSF) policy in wireless communication systems is unclear when both the ANDSF policy and RAN rule are available, particularly in determining how to incorporate Radio Access Network (RAN) assistance information for access network selection and traffic routing.
Innovation Solution
A method and apparatus for updating the ANDSF policy using RAN assistance information only if the UE is configured not to utilize the RAN rule for access network selection and traffic routing, ensuring that the ANDSF policy is updated based on received RAN assistance information when the RAN rule is not utilized.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE updates the ANDSF policy with RAN assistance information when both ANDSF policy and RAN rule are available, then the access network selection and traffic routing efficiency is improved, but the policy update complexity and potential conflicts between ANDSF policy and RAN rule increase
Solution Approach 1:
The patent introduces a configuration parameter that changes the UE's behavior mode: when the configuration indicates RAN rule utilization is disabled, the UE updates ANDSF policy with RAN assistance information; when enabled, the UE follows RAN rules. This parameter change resolves the contradiction by allowing flexible adaptation to different network conditions without implementing complex conflict resolution logic.
Solution Approach 2:
Instead of trying to combine ANDSF policy and RAN rule updates simultaneously (the conventional approach), the patent inverts the logic by updating the ANDSF policy based on whether RAN rule utilization is configured. This inversion simplifies the update mechanism and avoids the complexity of handling both policies concurrently.
2Reliability
If the UE utilizes both ANDSF policy and RAN rule for access network selection, then the network performance optimization is improved, but the determination of how to incorporate RAN assistance information becomes unclear
Solution Approach 1:
The patent introduces a configuration indicator as an intermediary element that mediates between the ANDSF policy and RAN rule. This configuration parameter clearly defines the UE's intended behavior mode, eliminating ambiguity about how to incorporate RAN assistance information when both policies are available.
3Device complexity
If the UE configures not to utilize RAN rule, then the policy update process is simplified, but the access network selection flexibility is reduced
Solution Approach 1:
The patent makes the UE's policy update behavior dynamic by introducing a configurable parameter that can be changed based on network conditions. The UE can switch between two operational modes: one where it updates ANDSF policy with RAN assistance information, and another where it follows RAN rules. This dynamic configuration provides flexibility without requiring complex simultaneous policy handling.
Data Source
AI summary
A method and apparatus for updating an access network discovery and selection functions (ANDSF) policy in a wireless communication system is provided. A user equipment (UE) receives the ANDSF policy and radio access network (RAN) assistance information for the ANDSF policy and a RAN rule, and further receives a configuration indicating whether both the ANDSF policy and the RAN rule are utilized for access network selection and traffic routing. Only if the received configuration indicates that the RAN rule is not utilized for the access network selection and traffic routing, the UE updates the ANDSF policy based on the received RAN assistance information, and performs the access network selection and traffic routing based on the received configuration.