Enhanced MBB Handover Failure Control With Dynamic RLF Declaration
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Solution Overview
Problem
Existing wireless communication systems experience handover failures during enhanced make-before-break handovers, leading to threshold failure rates and ping-pong signaling, which consume processing and network resources and reduce communication reliability.
Innovation Solution
A UE dynamically controls radio link failure declaration and notifies the source BS of handover failure, allowing the source BS to maintain communication while transitioning to a target BS, thereby reducing handover failure impacts and conserving resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If enhanced MBB handover with two protocol stacks is used, then handover reliability and latency are improved, but handover failure rate reaches a threshold causing ping-pong signaling
Solution Approach 1:
The patent implements dynamic control of radio link failure declaration by the UE during handover. Instead of static automatic declaration, the system dynamically adjusts RLF declaration behavior based on handover phase and source connection status. The UE monitors handover completion and selectively declares RLF only when appropriate, preventing premature failure declarations that trigger ping-pong signaling while maintaining reliability benefits of enhanced MBB handover.
Solution Approach 2:
The patent establishes feedback mechanisms where the UE notifies the source BS of handover failure through controlled RLF declaration and signaling. This feedback loop allows the source BS to awareness of handover status and maintain source connection accordingly. The feedback prevents information asymmetry that leads to unnecessary ping-pong signaling while ensuring proper handover failure handling.
2Reliability
If automatic radio link failure declaration is implemented, then connection reliability is maintained, but ping-pong signaling increases consuming processing resources
Solution Approach 1:
The system transitions from static automatic RLF declaration to dynamic conditional declaration. The UE evaluates multiple factors including handover completion status, source connection quality, and network instructions before declaring RLF. This dynamic approach maintains connection reliability by declaring RLF only when truly necessary while reducing unnecessary processing from ping-pong signaling caused by premature declarations.
Solution Approach 2:
The patent changes the parameter of RLF declaration timing and conditions. Instead of fixed automatic declaration upon handover initiation, the system modifies declaration parameters based on real-time handover progress and connection status. The UE adjusts RLF declaration behavior as a controllable parameter, declaring failure only when handover exceeds timeout thresholds or source connection degrades, thereby reducing false positives and processing overhead.
3Productivity
If source connection is released upon handover failure, then resources are freed, but communication loss occurs for the UE
Solution Approach 1:
The patent implements preliminary maintenance of source connection during handover failure. Instead of immediately releasing the source connection upon handover failure, the system keeps the source connection active as a backup communication path. The UE and source BS maintain the connection in a suspended state, allowing quick resumption of communications if target connection fails, thereby preventing communication loss while resources are still allocated.
Solution Approach 2:
The system provides a cushioning mechanism by maintaining the source connection as a safety net during handover transitions. This beforehand cushioning ensures that if the target connection fails or experiences issues, the UE still has an active communication path through the source BS. The source connection acts as a protective buffer against communication loss, releasing resources only after confirming target connection success or after a extended failure period.
Data Source
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AI summary
The present disclosure relates to a make-before-break handover in wireless communication. In some aspects, a user equipment (UE) may detect that a handover failure timer has expired prior to completing a handover of the UE from a source base station (BS) to a target BS. In some aspects, the UE may selectively declare, based at least in part on detecting that the timer has expired, a radio link failure.