UE NAS Connection Timer Adaptation for 5G Signaling Overhead
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Solution Overview
Problem
Current 5G mobile communication systems face challenges in maintaining NAS connections due to fixed timer values for T3540 and T3440, which do not account for varying delays in different modes of operation, leading to premature release of NAS signaling connections and increased signaling in the network.
Innovation Solution
The method involves extending the timer values based on predefined modes of operation, such as enhanced coverage, CE mode A, CE mode B, and satellite access, to ensure that NAS connections are maintained for the appropriate duration, preventing early release and reducing unnecessary re-transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed timer values are used for T3540 and T3440, then the system operation is simple, but the NAS connection reliability deteriorates due to premature release in varying operation modes
Solution Approach 1:
The patent applies dynamics by making the timer values adjustable based on UE operation modes. Instead of using fixed timer values, the system dynamically selects timer durations according to the specific operation mode (eMBB, URLLC, mMTC, enhanced coverage, satellite access), allowing the timer to adapt to varying delay characteristics of different modes while maintaining simple fixed values as a baseline option.
Solution Approach 2:
The patent changes the timer parameter values based on operation mode conditions. The timer duration is modified according to predefined modes such as extended coverage, satellite access, and different service types, transforming the static timer parameter into a conditional variable that optimizes NAS connection maintenance for each specific operational context.
2Loss of energy
If fixed timer values are used, then the configuration is simple, but signaling overhead increases due to premature connection release and re-transmissions
Solution Approach 1:
The patent modifies timer parameter values based on operation mode to prevent premature NAS connection release. By extending timer values for modes with higher delays (enhanced coverage, satellite access), the system reduces unnecessary connection releases and re-transmissions, thereby lowering signaling overhead and energy consumption despite increased configuration complexity.
3Reliability
If extended timer values are used for all modes, then NAS connection reliability improves, but the delay for normal operation modes increases unnecessarily
Solution Approach 1:
The patent applies local quality by assigning different timer values to different operation modes rather than using a uniform extended timer for all modes. Normal modes (eMBB, URLLC, mMTC) use standard timer values for quick connection establishment, while only specific modes with known delay characteristics (enhanced coverage, satellite access) use extended timer values, thereby maintaining reliability where needed without introducing unnecessary delays elsewhere.
4Adaptability or versatility
If mode-specific timer values are implemented, then adaptability to different operation modes improves, but the system complexity increases
Solution Approach 1:
The patent implements dynamics by creating a flexible timer management system that adapts to different UE operation modes. The system dynamically selects appropriate timer values based on the current mode, providing adaptability to varying delay characteristics while managing complexity through predefined mode-based rules rather than complex real-time adjustments.
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 controlling timer T3440 or T3540 in a User Equipment, UE, the timer being operable to guard a time during which the UE maintains a certain type of connection to a telecommunication network, wherein the timer has a default first time period in the absence of a first condition and a second condition being met, wherein if both the first condition and the second condition are met, then the first default time period is extended to a second time period.