UE NAS Timer Determination in Satellite Access Mode
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Solution Overview
Problem
Existing 5G mobile communication systems face unclear behavior in User Equipment (UE) when extending Non-Access Stratum (NAS) timers during satellite access, due to conflicting requirements from the network regarding enhanced coverage restrictions.
Innovation Solution
The method involves determining the NAS timer value for 5GS mobility management without considering any restrictions on the use of enhanced coverage indications from the telecommunication network, specifically when the UE is in satellite access mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network imposes restrictions on enhanced coverage indications, then network control and optimization are improved, but UE behavior becomes unclear during satellite access
Solution Approach 1:
The patent applies local quality by introducing satellite access type as a specific condition that modifies the general enhanced coverage restriction rules. When satellite access is detected, the UE applies different timer determination logic (ignoring RestrictEC bit) compared to terrestrial access. This localized exception resolves the contradiction by maintaining network control for terrestrial access while ensuring clear UE behavior for satellite access scenarios.
Solution Approach 2:
The patent inverts the normal logic by which enhanced coverage restrictions are applied. Instead of always considering the RestrictEC bit as the primary control mechanism, the patent inverts the logic to first check for satellite access type, and only if terrestrial access is detected does it consider the network's enhanced coverage restrictions. This inversion prioritizes satellite access requirements over general network control policies.
2Productivity
If NAS timer extension is restricted by network indication, then resource efficiency is improved, but satellite communication reliability deteriorates
Solution Approach 1:
The patent applies local quality by creating satellite-specific timer determination rules that differ from terrestrial access rules. For satellite access, the UE determines NAS timers without considering network restrictions, ensuring reliable satellite communication. For terrestrial access, the UE follows network restrictions to optimize resource efficiency. This localized approach resolves the contradiction by applying different quality standards to different access types.
3Adaptability or versatility
If UE follows network restrictions on enhanced coverage, then network policy compliance is improved, but satellite access performance deteriorates
Solution Approach 1:
The patent applies dynamics by making the UE's compliance behavior adaptive to the access type. The UE dynamically switches between two compliance modes: following network restrictions for terrestrial access and ignoring them for satellite access. This dynamic adaptation resolves the contradiction by allowing the UE to be compliant when appropriate (terrestrial) and non-compliant when necessary (satellite).
Solution Approach 2:
The patent introduces satellite access type as a local condition that overrides general network policy compliance requirements. By detecting satellite-specific parameters and applying different behavior rules, the patent ensures that network policy compliance is maintained for terrestrial access while satellite access receives special treatment for optimal performance.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Disclosed is a method of operating a User Equipment, UE, the UE communicating with a telecommunication network via a satellite, wherein when a Non-Access Stratum, NAS, timer is determined, any restriction on use of an enhanced coverage indication from the telecommunication network is not considered when the NAS timer is determined.