Conditional NAS Recovery for Mobile Stations
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Solution Overview
Problem
Existing network recovery methods in LTE networks consume substantial resources and generate high signaling loads when re-establishing connectivity, especially when no downlink data is expected, leading to unnecessary strain on the network.
Innovation Solution
A method for a mobile station to detect radio connection failures and selectively invoke a NAS recovery procedure only when downlink data is expected, by analyzing information from application, RLC, or MAC layers, and initiating a registration procedure accordingly, thereby reducing unnecessary resource consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If NAS recovery procedures are invoked to re-establish connectivity after radio connection failure, then connection reliability is improved, but network resource consumption and signaling load increase substantially
Solution Approach 1:
The patent changes the parameter of NAS procedure invocation from unconditional to conditional based on data expectation status. The mobile station evaluates whether downlink data is expected before initiating NAS recovery procedures, thereby adjusting the system behavior parameter (procedure invocation) based on the condition parameter (data expectation) to resolve the contradiction between connection reliability and network resource consumption
Solution Approach 2:
The patent applies partial action by selectively invoking NAS recovery procedures only when necessary (when downlink data is expected) rather than always invoking them. This partial invocation approach maintains sufficient connection reliability for actual data needs while avoiding excessive resource consumption from unnecessary procedure executions
2Reliability
If NAS recovery procedures are invoked to re-establish connectivity, then connection re-establishment capability is improved, but signaling load on the network increases
Solution Approach 1:
The patent changes the invocation parameter of NAS procedures from always-execute to conditionally-execute based on downlink data expectation. This parameter change reduces the frequency of NAS procedure invocations while maintaining re-establishment capability when needed, thereby reducing signaling load without sacrificing essential connection recovery functionality
Solution Approach 2:
The patent extracts the unnecessary NAS procedure invocations from the system by introducing a condition check that filters out redundant recovery attempts. By taking out only the necessary invocations (when data is expected) and eliminating unnecessary ones (when no data is expected), the signaling load is reduced while preserving essential re-establishment capability
3Reliability
If registration procedures are initiated after radio connection failure, then connectivity recovery is improved, but network efficiency deteriorates due to unnecessary resource usage
Solution Approach 1:
The patent changes the parameter of registration procedure initiation from unconditional to conditional based on downlink data expectation. By adjusting this parameter, the system maintains connectivity recovery capability for actual data scenarios while improving network efficiency by avoiding unnecessary registration procedures in data-less scenarios
Data Source
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AI summary
Example methods and apparatus to conditionally invoke network recovery are disclosed. A disclosed example method in a wireless device involves detecting a radio resource connection failure and identifying whether downlink data is expected. The disclosed example method also includes initiating a registration procedure when downlink data is expected.