Conditional Handover Target Cell Selection via Network Indication
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Solution Overview
Problem
In conditional handover (CHO) processes, the terminal autonomously selects target cells for handover, which may not be the best option due to load balancing issues, leading to potential handover failures.
Innovation Solution
A method where a terminal determines the target cell for handover based on a priority order and signal quality of candidate cells indicated by the network, rather than autonomously selecting, using indication signaling to configure candidate target cells and rules for the handover process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the terminal autonomously selects the target cell for handover, then the terminal can independently perform handover without network intervention, but the selected target cell may not be the best cell due to load balancing issues, leading to handover failures
Solution Approach 1:
The network device pre-configures multiple candidate target cells and selection rules for the terminal before handover is needed. When handover is triggered, the terminal applies these pre-configured rules to select the best target cell, ensuring both autonomous operation and reliable selection based on network-assigned priorities that account for load balancing
Solution Approach 2:
The network device provides feedback in the form of configured candidate cells and selection rules that incorporate network load information. The terminal uses this feedback to make informed handover decisions, and the network can update the configuration based on changing conditions, creating a closed-loop system that improves handover reliability
2Speed
If the terminal autonomously selects the target cell, then the handover process is faster and more autonomous, but load balancing considerations may be ignored, resulting in suboptimal cell selection
Solution Approach 1:
The network device pre-configures multiple candidate target cells and selection rules for the terminal before handover is needed. When handover is triggered, the terminal applies these pre-configured rules to select the best target cell, ensuring both autonomous operation and reliable selection based on network-assigned priorities that account for load balancing
Solution Approach 2:
The terminal changes the selection parameter from simple signal strength comparison to a rule-based selection that considers network-configured priorities. This parameter change allows the terminal to autonomously select cells while respecting network load balancing requirements, as the rules encode the network's preferences into the terminal's decision-making process
Data Source
AI summary
A cell handover method is performed by a terminal and includes: identifying indication signaling in response to performing a cell handover procedure according to a conditional handover (CHO) command, where the indication signaling is configured to indicate at least one candidate target cell and a pre-defined rule for the terminal performing a cell handover; and determining, based on the rule, a target cell of the handover from the at least one candidate target cell.