Wireless Device Mobility Handling with Target Cell Configuration Validation
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Solution Overview
Problem
In wireless communication systems, particularly in 3GPP LTE and NR, there is a challenge in handling mobility effectively, especially in scenarios where a target cell configuration is unavailable after a conditional mobility, leading to unnecessary actions and potential data interruptions due to invalid handling.
Innovation Solution
A method and apparatus where a wireless device identifies a cell satisfying a mobility condition and, upon determining the target cell configuration is unavailable, transmits a report indicating the unavailability, thereby preventing unnecessary actions and avoiding RRC re-establishment procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless device performs mobility to a target cell based on mobility condition satisfaction, then mobility procedure is completed, but data interruption occurs due to unavailable target cell configuration
Solution Approach 1:
The network side performs preliminary validation to determine whether target cell configuration is available before the wireless device executes the mobility procedure. This preliminary action prevents the device from attempting mobility to cells without valid configurations, thereby avoiding data interruptions while ensuring reliable mobility completion when configurations are available.
Solution Approach 2:
The system implements feedback mechanisms where the wireless device reports mobility condition satisfaction and configuration availability status to the network side. This feedback loop enables the network to monitor and control mobility procedures, ensuring that mobility is only completed when target cell configurations are available, thus maintaining data transmission continuity.
2Reliability
If the wireless device performs RRC re-establishment procedure for invalid handling, then connection is restored, but unnecessary actions are triggered
Solution Approach 1:
The network side performs preliminary validation to determine whether target cell configuration is available before the wireless device executes the mobility procedure. This preliminary anti-action prevents the device from attempting mobility to cells without valid configurations, thereby avoiding the need for subsequent RRC re-establishment procedures and reducing overall procedure complexity.
Solution Approach 2:
The system converts the potential harm of invalid mobility attempts into benefit by implementing pre-validation and reporting mechanisms. Instead of allowing invalid mobility to occur and then restoring connection through complex RRC re-establishment, the system proactively identifies and prevents invalid scenarios, transforming a potentially harmful process into a beneficial preventive measure that simplifies the overall procedure.
3Device complexity
If the wireless device transmits report for unavailable target cell configuration, then unnecessary actions are prevented, but additional signaling is required
Solution Approach 1:
The wireless device transmits feedback reports to the network side indicating mobility condition satisfaction and target cell configuration availability. This feedback mechanism enables the network to make informed decisions about mobility procedures, preventing unnecessary actions while managing signaling overhead through efficient report structures and selective transmission based on actual mobility scenarios.
Data Source
AI summary
The present disclosure relates to a mobility handling in wireless communications. According to an embodiment of the present disclosure, a method performed by a wireless device comprises: identifying a first cell which satisfies a mobility condition for the first cell included in a conditional mobility command of the first cell; and based on a determination that a target cell configuration for the first cell is unavailable, transmitting a report comprising information for an unavailability of the target cell configuration for the first cell.