UE Network Switching After 5G Home Data Session Failure
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Solution Overview
Problem
User Equipment (UE) devices experience an exception state when they successfully register with a 5G core network but fail 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 and periodically attempts to reconnect to the home network upon successful registration and data session establishment, using predefined timers and protocols to minimize connection time with the roaming network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE follows existing 5G NR standards and remains registered with the home network after successful registration but failed data session establishment, then the UE maintains registration status, but the UE cannot access data services and cannot handover to roaming network
Solution Approach 1:
The patent applies dynamics by making the network selection state changeable. The UE transitions from a static registered state to a dynamic state where it can switch between home network and roaming network based on data session establishment success. The UE dynamically adjusts its network attachment behavior by detecting the exception state and initiating handover to roaming network, thereby resolving the contradiction between maintaining registration and enabling data service access.
Solution Approach 2:
The patent changes the network selection parameter from fixed (home network only) to variable (home or roaming network). By monitoring data session establishment outcomes and changing the network attachment parameter accordingly, the UE can switch between home and roaming networks. This parameter change enables the UE to adapt to different network conditions and maintain data service availability.
2Reliability
If the UE continuously attempts to establish data session in the home network, then the UE maintains home network registration, but processing resources and battery are wasted
Solution Approach 1:
The patent applies preliminary action by proactively switching to roaming network when data session establishment fails in the home network. Instead of continuously retrying data session establishment (which would waste energy), the UE performs a preliminary handover to roaming network to maintain data service continuity. This preliminary action prevents the need for repeated failed attempts and reduces battery consumption.
Solution Approach 2:
The patent implements feedback by monitoring data session establishment outcomes and using this information to control network switching behavior. When the UE detects repeated data session establishment failures in the home network, it uses this feedback to trigger handover to roaming network. This feedback mechanism prevents continuous retry attempts that would consume battery resources while maintaining data service availability.
3Reliability
If the UE switches to roaming network immediately upon data session failure, then data service continuity is maintained, but connection time with less preferred network increases
Solution Approach 1:
The patent applies preliminary action by attempting data session establishment a predefined number of times before switching to roaming network. This preliminary retry mechanism allows the UE to give the home network a chance to recover from temporary failures before incurring the cost of roaming network connection, thereby minimizing unnecessary roaming time while still maintaining data service continuity.
Solution Approach 2:
The patent implements periodic action by using predefined timers and periodic retry attempts before switching to roaming network. The UE periodically attempts data session establishment with a predefined retry count and timer, and only switches to roaming network if failures persist. This periodic approach balances data service continuity with minimizing roaming network connection duration.
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.