UE Registration Adaptation for 5G-LTE Mobility
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Solution Overview
Problem
Mobility management failures occur when user equipment (UE) moves between 5G and LTE networks due to mismatched registration modes, particularly when the Nx interface is not supported, leading to packet loss and service discontinuity.
Innovation Solution
The UE initiates an attaching or initial registration procedure based on assistance information from the network, such as NAS level indications or neighborhood measurement information, to determine if single registration mode is supported, and performs reselection or attachment accordingly to ensure seamless communication across different access technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the terminal supports merely the single registration mode and the network does not support the Nx interface, then the terminal implementation is simplified, but the mobility management process fails when the UE moves between 5G and LTE networks
Solution Approach 1:
The network performs preliminary actions by determining whether the Nx interface is supported and proactively notifying the terminal of this capability before mobility events occur. This allows the terminal to prepare appropriate registration procedures in advance, ensuring reliable mobility management while maintaining simple terminal implementation.
Solution Approach 2:
The network provides feedback to the terminal about Nx interface support capability through notification messages. This feedback mechanism enables the terminal to adapt its registration mode selection based on network capabilities, resolving the contradiction between simplified terminal implementation and reliable mobility management.
2Reliability
If the UE performs dual registration mode to ensure mobility management between 5G and LTE networks, then the mobility reliability is improved, but the terminal complexity and power consumption increase
Solution Approach 1:
The terminal dynamically selects between single and dual registration modes based on network notifications about Nx interface support. This dynamic adaptation allows the terminal to use simple single registration mode when Nx is supported, reducing complexity and power consumption, while switching to dual registration mode only when necessary for mobility reliability.
3Device complexity
If the terminal does not support the Nx interface while the network supports it, then the terminal implementation is simplified, but the interoperability between 5G Core Network and Evolved Packet Core fails
Solution Approach 1:
The network provides feedback to the terminal about Nx interface support capability through notification messages. This feedback mechanism enables the terminal to adapt its registration mode selection based on network capabilities, resolving the contradiction between simplified terminal implementation and reliable mobility management.
Data Source
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AI summary
The preset disclosure provides an information processing method and device. The information processing method is applied to a user equipment (UE) operating in a single registration mode, and includes: receiving assistance information from a first network; initiating an attaching or initial registration procedure according to the assistance information received from the first network when moving between the first network and a second network, the first and second networks utilizing different access technologies.