Base Station Forced Access Change Reverse Handover
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Solution Overview
Problem
In wireless communication systems, when a UE is forced to change access by traffic management, such as EPS Fallback, it cannot return to its preferred access until it reselects a cell or RF conditions improve, leading to suboptimal network performance.
Innovation Solution
Implementing a method where the network transmits information about forced access changes and conditions to involved nodes, enabling a UE to be handed back to its preferred access network as soon as the condition that caused the access change is resolved, using handover requests and transparent containers to manage this process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a UE is forced to change access by traffic management (e.g., EPS Fallback), then network traffic management is improved, but the UE cannot return to its preferred access until cell reselection or RF conditions improve, leading to suboptimal network performance
Solution Approach 1:
The source base station performs preliminary actions by including information about the forced access change and the original preferred access in the handover request message sent to the target base station. This advance preparation enables the target base station to immediately initiate a reverse handover when the forcing condition disappears, eliminating the need for the UE to wait for cell reselection or RF condition improvement.
Solution Approach 2:
The system implements feedback by monitoring the condition that forced the access change and using this information to trigger the reverse handover. When the forcing condition (e.g., voice call establishment) disappears, the target base station receives feedback about this change and automatically initiates the handover back to the preferred access, creating a closed-loop control system.
2Adaptability or versatility
If a UE is forced to change access by traffic management, then traffic management control is improved, but the UE remains on non-preferred access longer than necessary, reducing access optimization
Solution Approach 1:
The monitoring of the forcing condition and the automatic trigger of reverse handover when the condition disappears creates a feedback mechanism that maintains access optimization. This ensures the UE adapts to traffic management requirements while automatically returning to the optimal access when those requirements are no longer present.
Solution Approach 2:
The system dynamically adjusts the UE's access based on real-time conditions. The handover state is not static but changes in response to the forcing condition, allowing the system to maintain both traffic management control and access optimization efficiency by being flexible rather than rigid.
Data Source
AI summary
A method performed by a first base station associated with a preferred access network includes initiating a first handover of a wireless device to a second base station associated with a non-preferred access network in response to fulfillment of a condition. Information indicating that the wireless device is subject to a forced access change is transmitted to a second base station associated with the non-preferred access network. The information also indicates that a second handover of the wireless device should be initiated to hand the wireless device back to the first base station or another base station associated with the preferred access network as soon as the condition is no longer fulfilled.