UE EPS Optimization Handling via NAS Priority
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Solution Overview
Problem
User equipment (UE) faces challenges in determining network feature support due to mismatches between system information and Non Access Stratum (NAS) messages, leading to inconsistent usage of network features.
Innovation Solution
The UE prioritizes NAS messages over system information to determine network feature support, ensuring proper usage of EPS optimizations by only utilizing features indicated as supported in the NAS messages, even if system information contradicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the UE determines network feature support based on system information, then the UE can quickly obtain network capability information, but the UE may use unsupported features when NAS messages indicate mismatched support status
Solution Approach 1:
The UE implements a feedback mechanism by comparing system information with NAS messages to determine actual network feature support. When the NAS message indicates a feature is not supported despite system information suggesting otherwise, the UE adjusts its behavior accordingly, using the NAS message as the authoritative feedback source for feature availability
Solution Approach 2:
The network performs preliminary action by including feature support information in NAS messages before the UE attempts to use those features. This advance notification allows the UE to proactively adjust its feature usage capabilities, preventing attempts to use unsupported features and ensuring reliable operation
2Loss of information
If the UE uses both system information and NAS messages to determine network feature support, then comprehensive information is gathered, but determination becomes impossible when information mismatches occur
Solution Approach 1:
The invention inverts the traditional approach by making the NAS message the primary source of truth for feature support rather than system information. When NAS messages and system information conflict, the UE prioritizes NAS message indications, effectively reversing the expected hierarchy of information sources
Solution Approach 2:
The UE introduces an intermediary comparison mechanism that mediates between system information and NAS messages. This intermediary process evaluates both sources and resolves conflicts by prioritizing NAS message information, enabling the UE to handle mismatched information systematically
Data Source
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AI summary
A communication device of handling a network feature comprises a storage unit for storing instructions and a processing circuit coupled to the storage unit. The processing circuit is configured to execute the instructions stored in the storage unit. The instructions comprise receiving system information indicating whether an Evolved Packet System (EPS) optimization is supported and a first Non Access Stratum (NAS) message indicating whether the EPS optimization is supported; determining to use the EPS optimization, when the system information indicates that the EPS optimization is not supported and the first NAS message indicates that the EPS optimization is supported; and determining not to use the EPS optimization, when the system information indicates that the EPS optimization is supported and the first NAS message indicates that the EPS optimization is not supported.