User Equipment Attach Request Handling for Intersystem Change
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Solution Overview
Problem
The existing 4G mobile communication systems face challenges in supporting high-reliability and low-latency services due to transmission delays exceeding 1 ms, which is insufficient for applications like automatic driving and factory automation, and struggle to accommodate ultra-wideband high-speed services, necessitating a redesign of the core network for 5G mobile communication.
Innovation Solution
The introduction of network slicing in next-generation mobile communication systems allows for the creation of logical or hardware-independent network nodes that provide specific services, enabling the separation and optimization of core network components, and the use of a method for performing an attach request procedure that overrides back-off timers during intersystem changes to ensure seamless service continuity across different networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If back-off timer is applied for DNN-based congestion control, then network congestion is reduced, but service continuity is interrupted during intersystem changes
Solution Approach 1:
The patent applies dynamics by making the back-off timer behavior adaptive rather than static. The timer is dynamically overridden during intersystem change procedures, allowing the system to adjust congestion control behavior based on the operational context. This resolves the contradiction by enabling the system to maintain congestion control benefits while temporarily suspending timer enforcement to ensure service continuity during critical handover scenarios.
Solution Approach 2:
The patent changes the parameter state of the back-off timer from active to overridden during intersystem changes. By modifying the timer's operational state based on system change detection, the patent enables seamless service continuity while maintaining congestion control during normal operations. This parameter change approach allows the system to switch between congestion control modes as needed.
2Adaptability or versatility
If network slicing is implemented, then service optimization is improved, but network complexity increases
Solution Approach 1:
The patent implements network slicing by segmenting the network into logical slices that can be independently optimized for different services. This segmentation allows specific services to receive tailored resource allocation and performance optimization without affecting other services, resolving the contradiction by organizing complexity into manageable, service-specific segments rather than a monolithic system.
Solution Approach 2:
The patent creates network slice instances that can serve multiple functions and services through a unified architecture. Each slice instance is designed to be multi-functional, capable of supporting different service types while sharing common infrastructure resources. This universality approach reduces overall network complexity while maintaining service optimization capabilities.
Data Source
AI summary
One disclosure of the present specification provides a method in which a user equipment (UE) performs an attach request procedure. The method comprises a step of transmitting an attach request message to a second system when an intersystem change from a first system to the second system is required in a state where a back-off timer associated with a data network name (DNN) based congestion control is running. The attach request message may include information on a packet data unit (PDU) session used by the UE in the first system. The information on the PDU session may be used so as not for the attach request message to be rejected by a second network, even if the back-off timer associated with the DNN-based congestion control is running.