User Equipment Handover to Candidate Target Cells
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Solution Overview
Problem
In wireless communication systems, particularly in 5G and pre-5G networks, the existing handover mechanisms do not adequately address the scenario where a user equipment (UE) fails to connect to a target cell, leading to inefficiencies in mobility procedures such as conditional handover, where the UE evaluates conditions for target cells but lacks methods to handle failures effectively.
Innovation Solution
A method for a UE to perform a handover to a new target cell without waiting for a failure in the current target cell, by receiving information on candidate target cells and handover conditions from a base station, and proactively switching to a second target cell with better channel quality before detecting a failure in the initial target cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE waits for failure detection in the current target cell before switching, then the handover procedure follows the existing protocol, but the connection stability deteriorates and handover failures increase
Solution Approach 1:
The UE proactively switches to a second target cell before the handover to the first target cell fails, based on channel quality comparison. This preliminary action prevents the failure state from occurring, thereby maintaining connection stability without waiting for failure detection
Solution Approach 2:
The UE continuously monitors and compares channel qualities of multiple target cells, using this feedback information to make real-time handover decisions. When the second target cell shows better channel quality, the UE switches to it, preventing handover failure
2Reliability
If the UE proactively switches to a better channel quality target cell before failure detection, then the handover success rate improves, but the complexity of the handover procedure increases
Solution Approach 1:
The UE autonomously performs channel quality comparison and makes handover decisions without requiring complex network control or additional signaling. The device serves itself by independently evaluating conditions and executing the switch to the better target cell
Solution Approach 2:
The UE prepares multiple target cell candidates in advance and establishes comparison criteria before handover is needed. This preliminary preparation simplifies the actual handover execution by having pre-evaluated options ready
3Productivity
If the UE follows the existing conditional handover procedure and waits for failure detection, then the protocol implementation remains simple, but the mobility efficiency deteriorates
Solution Approach 1:
The UE uses real-time channel quality feedback from multiple target cells to dynamically adjust handover decisions. This continuous feedback mechanism enables efficient mobility by always selecting the best available target cell based on current conditions
Solution Approach 2:
The handover procedure becomes dynamic as the UE continuously evaluates channel qualities and can switch targets based on real-time conditions rather than following a fixed, static procedure. This adaptability improves mobility efficiency
Data Source
AI summary
Provided are a method for performing a handover by a user equipment (UE) in a wireless communication system, and an apparatus supporting the same. The method may include: receiving information on candidate target cells for the handover and a handover condition, from a base station; initiating a handover to a first target cell among the candidate target cells, based on the handover condition; before detecting a failure of the handover to the first target cell, when channel quality of a second target cell among the candidate target cells is higher than channel quality of the first target cell, stopping the handover to the first target cell; and performing a handover to the second target cell.