UICC PDP Context Rejection Cause Code Feedback Mechanism
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Solution Overview
Problem
In wireless telecommunications systems, Universal Integrated Circuit Cards (UICC) are not aware of network failures during Packet Data Protocol (PDP) Context activation procedures, leading to potential network overload due to poorly implemented applications retrying data sessions, which can negatively impact the network.
Innovation Solution
A method and system that provide the UICC with Session Management (SM) cause codes and Evolved Session Management (ESM) cause codes from the Mobile Equipment (ME) for PDP Context activation rejections, allowing the UICC to intelligently select an appropriate Access Point Name (APN) and manage retries, thereby monitoring rejections and avoiding network overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UICC is not provided with network failure information, then the device complexity remains low, but the network reliability deteriorates due to repeated retry attempts causing network overload
Solution Approach 1:
The patent implements a feedback mechanism where the ME (Mobile Equipment) transmits rejection cause codes from network rejections to the UICC (Universal Integrated Circuit Card). This feedback loop enables the UICC to receive information about network failures and use it to manage retry attempts appropriately, preventing network overload while maintaining manageable complexity through standardized protocol extensions.
2Productivity
If the UICC actively manages retry attempts with network rejection information, then the network overload is reduced, but the loss of time increases due to additional processing and back-off periods
Solution Approach 1:
The feedback mechanism provides the UICC with rejection cause codes that enable intelligent retry management. By understanding why a connection was rejected, the UICC can implement appropriate back-off strategies and select alternative APNs (Access Point Names), thereby improving network efficiency while the time loss is minimized through automated decision-making rather than manual intervention.
3Adaptability or versatility
If the ME transmits all SM cause codes to the UICC, then the UICC has complete information for intelligent APN selection, but the loss of information increases due to the volume of data transmitted
Solution Approach 1:
The patent extracts only the essential rejection cause codes from the full SM (Session Management) messages and transmits these condensed pieces of information to the UICC. This extraction approach provides the UICC with sufficient information for intelligent APN selection and retry management while minimizing the data transmission volume, avoiding the need to transmit complete message sets.
Data Source
AI summary
A method and system for introducing support for SM rejections in a USAT network rejection event including an APN. The method and system provide the UICC with all PDP Context activation rejection cause codes received by the ME and their respective APNs. Such a method and system allows the UICC to monitor all the rejections to intelligently select an appropriate APN to activate using its Open channel command.