Wireless Conditional Handover Notifications to Prevent Transmission Overlap
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing overlapping transmissions during conditional handover processes, particularly in scenarios involving make-before-break handover, where a user equipment (UE) remains connected to both the source and target cells, leading to potential interference.
Innovation Solution
The UE transmits a notification to the source cell detailing its simultaneous connection with the target cell, including information on search space configurations, resource scheduling, beam usage, and requests for resource activation or release, enabling the source cell to adjust its transmissions to avoid overlaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE performs conditional handover while remaining connected to both source and target cells (make-before-break handover), then handover reliability is improved, but transmission interference increases due to overlapping transmissions
Solution Approach 1:
The UE provides feedback information to the source cell about its connection status with the target cell, including search space configurations, resource scheduling information, and beam usage details. This feedback enables the source cell to adjust its transmissions and avoid overlapping with target cell transmissions, thereby resolving the interference problem while maintaining handover reliability.
Solution Approach 2:
The notification message acts as an intermediary mechanism that carries critical information between the UE and source cell. This notification includes details about resource allocation, search space configurations, and beam parameters, enabling the source cell to coordinate its transmissions with the target cell and eliminate harmful interference during the handover period.
2Duration of action of stationary object
If the source cell continues transmissions during conditional handover, then communication continuity is maintained, but resource conflicts occur with target cell transmissions
Solution Approach 1:
The UE sends a notification message to the source cell before or during the handover process, providing advance information about resource allocation, search space configurations, and beam parameters. This preliminary information allows the source cell to proactively adjust its resource usage and avoid conflicts with the target cell, maintaining communication continuity while simplifying coordination.
Data Source
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AI summary
Aspects described herein relate to receiving, from a serving cell, a configuration for performing conditional handover to one or more target cells, establishing, based on detecting a condition from the configuration, a connection with a target cell for performing handover to the target cell, and transmitting, based on establishing the connection with the target cell and based on determining that the conditional handover is of a type where a source connection with the source cell remains, a notification to the serving cell.