Conditional Mobility Based on Channel Occupancy in 5G Unlicensed Bands
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, conditional mobility on unlicensed bands faces challenges due to congestion levels and cell quality, which affect handover efficiency and reliability, as existing technologies do not adequately consider channel occupancy and congestion when triggering mobility events.
Innovation Solution
A method and apparatus that perform congestion level measurements and receive conditional mobility configurations from a serving node, allowing wireless devices to handover to target cells based on measured congestion levels and thresholds, optimizing mobility decisions to avoid congested frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conditional mobility is performed on unlicensed bands without considering congestion level, then handover can be triggered based on cell quality, but handover failures and interruption time increase due to channel congestion
Solution Approach 1:
The patent applies preliminary action by performing congestion level measurements and evaluating handover conditions in advance before actual handover execution. The UE assesses both cell quality and congestion levels of target cells beforehand, preparing conditional handover configurations that account for channel occupancy. This advance evaluation prevents selecting congested target cells, thereby reducing handover failures and interruption time while maintaining reliability.
2Reliability
If congestion level measurement and evaluation are added to mobility triggering conditions, then handover reliability improves by avoiding congested cells, but device complexity and measurement overhead increase
Solution Approach 1:
The patent applies universality by integrating congestion level measurement functionality into the existing mobility management framework. The same measurement mechanisms and evaluation processes used for cell quality assessment are extended to also evaluate congestion levels. This multi-functional approach allows the system to assess both cell quality and channel occupancy using unified procedures, reducing the need for separate complex measurement systems while improving handover reliability.
Data Source
AI summary
A method and apparatus for performing a conditional mobility based on a congestion level in a wireless communication system is provided. That is, the congestion level may be considered as mobility triggering condition of the conditional mobility. A wireless device performs a congestion level measurement, and receives a conditional mobility configuration associated with multiple target cells from a serving node. The conditional mobility configuration includes a threshold for the congestion level. The wireless device performs a mobility towards one target cell among the multiple target cells based on a result of the congestion level measurement and the threshold for the congestion level.