AI 中文总结
针对LEO NTN-TN集成网络中现有NAS定时器配置不足，提出位置感知、UE特定的优化方法，通过服务链路几何等建模路径延迟分量，依UE情况调整端点延迟分量，有效减少注册延迟、UE能耗及不必要注册尝试。
AI 中文摘要
高效的非接入层（NAS）定时器配置对于非地面网络（NTN）-地面网络（TN）集成系统中可靠且节能的第五代（5G）注册至关重要，其中低地球轨道（LEO）卫星接入会带来大量注册突发、异构传播路径和多跳卫星路由。现有3GPP NAS定时器使用固定值，先前的闭式定时器模型在网络级假设下计算全局定时器，两者都无法捕捉用户设备（UE）在传播延迟、接入与移动性管理功能（AMF）到达位置和路径可靠性方面的差异。本文提出一种针对LEO NTN-TN集成网络的位置感知、特定于UE的NAS定时器优化方法。该方法使用服务链路几何、地面站距离和星际链路（ISL）跳数对路径延迟分量进行建模，并根据每个UE的预期AMF队列暴露和路径可靠性调整端点延迟分量。仿真结果表明，与固定和全局定时器配置相比，我们的方法减少了注册延迟、UE能耗和可避免的注册尝试，特别是在定时器过度配置导致不必要等待的情况下。
英文摘要
Efficient Non-Access Stratum (NAS) timer configuration is critical for reliable and energy-efficient Fifth Generation (5G) registration in Non-Terrestrial Network (NTN)-Terrestrial Network (TN) integrated systems, where Low Earth Orbit (LEO) satellite access introduces large registration bursts, heterogeneous propagation paths, and multi-hop satellite routing. Existing 3GPP NAS timers use fixed values, while prior closed-form timer models compute a global timer under network-level assumptions; both fail to capture user equipment (UE)-level differences in propagation delay, Access and Mobility Management Function (AMF) arrival position, and path reliability. In this paper, we propose a location-aware, UE-specific NAS timer optimization method for LEO NTN-TN integrated networks. The proposed method models the path-delay component using service-link geometry, ground-station distance, and Inter-Satellite Link (ISL) hop count, and adapts the endpoint-delay component according to each UE's expected AMF queue exposure and path reliability. Simulation results show that our method reduces registration latency, UE energy consumption, and avoidable registration attempts compared with fixed and global timer configurations, especially when timer over-provisioning causes unnecessary waiting.
CommentsTo be published in 2026 IEEE CIC/ICCC, 7 - 9 August 2026, Wuhan, China
