Terminal Mobility Reporting for 5G Network Handover
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Solution Overview
Problem
In 5G networks, terminal devices moving across different non-public and public networks (NPN/PLMN) face challenges in notifying the network side of their mobility, leading to delays in session processing and data forwarding due to the lack of a direct interface between access networks.
Innovation Solution
A data transmission method where the terminal device actively reports its network movement to the access and mobility management function (AMF) network element, allowing for the reservation of context and preconfiguration of data forwarding resources, enabling timely session processing and data transmission across networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the terminal device moves across networks (SNPN to PLMN or vice versa), then the terminal device can maintain access to different network types, but the network side cannot detect the mobility in time due to lack of direct interface between access networks
Solution Approach 1:
Instead of having the network detect terminal mobility through traditional signaling interfaces, the patent inverts the approach by having the terminal device actively report its own mobility status to the network. The terminal device sends a first message to the first network device indicating it needs to move from the first network to the second network, allowing the network side to obtain mobility information in a timely manner without requiring direct interfaces between different access networks.
2Reliability
If the network side processes sessions in real-time upon terminal mobility, then service continuity can be maintained, but this requires direct interfaces between access networks which do not exist
Solution Approach 1:
The patent introduces the terminal device itself as an intermediary that carries mobility information between different access networks. Instead of requiring direct communication interfaces between SNPN and PLMN access networks, the terminal device acts as a mediator by reporting its mobility status to the network side through the first network device, enabling session processing without complex inter-network interfaces.
3Productivity
If the terminal device reports mobility proactively, then the network can prepare data forwarding resources in advance, but this requires additional signaling from the terminal
Solution Approach 1:
The patent implements preliminary action by having the terminal device send a first message to the first network device before actually moving to the second network. This advance notification allows the network side to reserve context and preconfigure data forwarding resources in time, improving data forwarding efficiency when the terminal actually moves across networks.
Data Source
AI summary
In a data transmission method, a terminal device determines a first message, where the first message indicates that the terminal device is to move from a first network to a second network. The terminal device sends the first message to a first network device in the first network. The first network device is an access and mobility management function network element or an access network device.