Conditional Handover Evaluation in Dual Connectivity
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Solution Overview
Problem
In Dual Connectivity (DC) mode, terminal devices face challenges in avoiding improper transitions from DC mode to single connectivity due to moving conditions and deteriorating communication quality.
Innovation Solution
A method where a terminal device, served by both a primary and secondary serving cell, receives configuration information for conditional cell change configurations associated with candidate cells. If a condition for switching to a first candidate cell is met, the device continues to evaluate a second condition for switching to a second candidate cell within a specified period, thereby avoiding immediate fallback to single connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the terminal device switches to single connectivity when a handover condition is met, then the handover process is simplified and executed quickly, but the throughput and reliability deteriorate due to loss of Dual Connectivity benefits
Solution Approach 1:
The terminal device pre-evaluates multiple candidate cells and their conditions before executing handover. When a first candidate cell's condition is met, the device continues to evaluate a second candidate cell's condition within a specified period, allowing it to make an informed decision that maintains Dual Connectivity if possible, thus preserving throughput while still enabling timely handover execution.
2Device complexity
If the terminal device transitions to single connectivity upon meeting handover conditions, then the device complexity is reduced, but the reliability of communication deteriorates
Solution Approach 1:
The terminal device implements a feedback mechanism by continuously evaluating conditions of candidate cells and monitoring the specified period. When a first condition is met, the device feedback-loops to continue evaluating the second condition, ensuring that the transition to single connectivity only occurs when necessary, thus maintaining communication reliability while managing device complexity.
3Loss of time
If the terminal device immediately switches cells when a condition is met, then the response time is reduced, but improper transitions from DC mode to single connectivity occur
Solution Approach 1:
The terminal device performs partial evaluation by continuing to assess the second candidate cell's condition within a specified period even after the first condition is met. This partial extension of evaluation time prevents hasty transitions while still maintaining efficient handover execution, ensuring accurate transitions without excessive time loss.
Data Source
AI summary
Example embodiments of the present disclosure relate to a solution for handling a conditional handover. In this solution, the first apparatus, receives, from a second apparatus, configuration information indicating: a first conditional cell change configuration associated with a first candidate cell of the first apparatus, and a second conditional cell change configuration associated with a second candidate cell of the first apparatus; and in accordance with a determination that a first condition for switching to the first candidate cell is met, continues to evaluate a second condition for switching to the second candidate cell within a period, wherein the first apparatus is served by a first serving cell and a second serving cell.