Conditional Handover Prioritization for DAPS Service Continuity
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Solution Overview
Problem
Existing wireless communication systems face issues with conditional handovers (CHO) and dual active protocol stack (DAPS) handovers, particularly in scenarios where target cells support only CHO, leading to potential service interruptions and radio link failures for users requiring high service availability.
Innovation Solution
A user equipment (UE) is configured to wait before detaching from a source cell to evaluate if a target cell supports both CHO and DAPS, executing DAPS handover if the target cell meets the condition within a predefined time duration, otherwise performing CHO.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the user equipment immediately detaches from the source cell upon meeting CHO execution conditions, then the handover execution speed is improved, but service interruptions and radio link failures increase when the target cell does not support DAPS
Solution Approach 1:
The network configures the UE with multiple target cells (first target cell supporting CHO only, second target cell supporting both CHO and DAPS) in advance, along with execution conditions for each. When the UE meets the execution condition for the first target cell, it checks whether the second target cell's condition is also met before detaching from the source cell. This preliminary checking mechanism allows the UE to prioritize DAPS handover when available, reducing service interruptions while maintaining fast handover execution.
2Reliability
If the user equipment waits to evaluate target cell DAPS support before detaching, then service continuity is improved, but handover execution delay increases
Solution Approach 1:
The UE autonomously evaluates the execution conditions for multiple target cells using pre-configured parameters without requiring additional network signaling or interference with ongoing data transmission. The UE independently determines whether to execute CHO to the first target cell or wait for DAPS handover to the second target cell, enabling self-service decision-making that minimizes both delay and service interruption.
3Adaptability or versatility
If the network configures multiple target cells with different handover types, then adaptability is improved, but device complexity increases
Solution Approach 1:
The handover configuration is segmented into multiple independent target cell entries, each with its own execution condition and handover type (CHO or DAPS). The UE evaluates each target cell's execution condition independently based on pre-configured parameters such as reference signal received power thresholds. This segmentation allows the UE to systematically compare multiple target cells and select the most appropriate one, achieving high adaptability while keeping the evaluation logic organized and manageable.
Data Source
AI summary
An apparatus performs evaluating, with a user equipment of a communication network, before detaching from a source cell a conditional handover execution condition fulfillment for a conditional handover with the user equipment from the source cell to at least one target cell of the communication network; and based on the evaluating, detaching from the source cell for performing the conditional handover to a target cell of the at least one target cell. Further, an apparatus performs sending toward user equipment information comprising a configuration of a conditional handover, wherein the information causes the user equipment to evaluate a conditional handover execution condition fulfillment before detaching from the source cell for at least one target cell based on an indication of the conditional handover execution condition fulfillment to a first target cell of the at least one target cell that does not support a dual active protocol stack configuration.