Home-Roaming Network Switching for 5G Data Session Failure
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Solution Overview
Problem
User Equipment (UE) experiences an exception state when it successfully registers with a 5G core network but fails to establish a data session, preventing data access and hindering handover to a roaming network, as per existing 5G NR standards.
Innovation Solution
The UE dynamically switches to a roaming network upon detecting a failed data session, periodically attempts to reconnect to the home network, and switches back once the data session is established, using predefined timers and protocols to manage this process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE follows the standard 5G attach procedure and registers with the home network, then the UE can access control plane services, but the UE cannot establish a data session and remains in an exception state
Solution Approach 1:
The patent implements dynamic network selection by enabling the UE to switch between home network and roaming network based on data session establishment status. The UE dynamically transitions from a static registered state to an adaptive state where it can handover to roaming networks when data session fails, thereby resolving the exception state while maintaining control plane connectivity.
Solution Approach 2:
The patent changes the network selection parameter based on data session establishment outcome. When data session establishment fails despite successful registration, the UE changes its network attachment parameter to seek alternative roaming networks, transforming the exception state into a manageable condition with restored data service capability.
2Reliability
If the UE continuously attempts to establish data session in the home network, then the UE maintains registration with the home network, but the UE wastes processing, memory and battery resources
Solution Approach 1:
The patent implements a feedback mechanism where the UE monitors data session establishment status and uses this feedback to determine subsequent actions. When data session establishment fails, the UE receives feedback indicating the exception state and responds by initiating handover to roaming networks, thereby avoiding continuous futile attempts that would waste battery resources while maintaining home network registration.
3Reliability
If the UE switches to the roaming network to access data services, then the UE can establish data session, but the UE loses access to higher quality and cheaper services of the home network
Solution Approach 1:
The patent implements dynamic network selection by enabling the UE to switch between home network and roaming network based on data session establishment status. The UE dynamically transitions from a static registered state to an adaptive state where it can handover to roaming networks when data session fails, thereby resolving the exception state while maintaining control plane connectivity.
4Reliability
If the UE remains in the exception state, then the UE maintains registration with the home network, but the UE cannot access data services or handover to roaming network
Solution Approach 1:
The patent implements dynamic network selection by enabling the UE to switch between home network and roaming network based on data session establishment status. The UE dynamically transitions from a static registered state to an adaptive state where it can handover to roaming networks when data session fails, thereby resolving the exception state while maintaining control plane connectivity.
Data Source
AI summary
A system comprises a home network including a Radio Access Network and a core network, a roaming network, and a User Equipment (UE) subscribing to the home network and the roaming network. The UE is configured to determine, while connected to a control plane of the core network, that the UE is not connected to a user plane of the core network. In response, the UE connects to the roaming network. While connected to the roaming network, the UE periodically attempts to connect to the home network. The UE switches back to the home network upon successfully connecting to the control plane and the user plane of the core network.