Conditional Handover Recovery Using Preconfigured Backup Cells
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Solution Overview
Problem
In 5G networks, conditional handover (CHO) processes face challenges in ensuring successful connection restoration when the user equipment (UE) fails to handover to a target cell, leading to inefficiencies in handover command execution.
Innovation Solution
The base station sends a handover command containing a first cell identifier for the target cell and at least one second cell identifier for alternative cells that the UE can access if the initial handover fails, along with duration information to manage resource allocation and timer settings for these cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network sends a handover command to the UE for handover to a target cell, then the handover process is initiated, but if the UE fails to access the target cell, connection restoration becomes complex and time-consuming
Solution Approach 1:
The network pre-configures alternative target cells and their identifiers in the handover command before handover failure occurs. When the UE fails to access the primary target cell, it can immediately use the pre-configured alternative cell identifiers to initiate connection restoration without waiting for network intervention, thereby reducing recovery time and improving restoration success rate.
2Reliability
If the UE waits for network instruction after handover failure, then connection restoration can be coordinated, but the recovery time increases significantly
Solution Approach 1:
The handover command includes pre-configured alternative target cell information and restoration instructions that the UE can execute autonomously upon handover failure. This preliminary configuration enables the UE to immediately initiate connection restoration to alternative cells without waiting for network responses, achieving both coordination (through pre-planned alternatives) and rapid recovery.
3Reliability
If the handover command contains only the primary target cell identifier, then the command is simple, but the UE has no alternative if the primary handover fails
Solution Approach 1:
The handover command is segmented to include a primary target cell identifier and multiple alternative target cell identifiers. This segmentation allows the UE to attempt handover to the primary cell first, and if that fails, sequentially try alternative cells. The segmented structure maintains command clarity while providing multiple handover paths, improving success rate without excessive complexity.
Solution Approach 2:
The handover command is designed to serve multiple functions: it provides the primary target cell for normal handover, and simultaneously provides alternative target cells for failure recovery. This multi-functionality allows a single command structure to handle both successful handover scenarios and failure recovery scenarios, improving reliability without requiring separate commands for each case.
Data Source
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AI summary
Disclosed are a handover processing method and apparatus. The method comprises: carrying a first cell identifier and at least one second cell identifier in a handover command, wherein a first cell identified by the first cell identifier is: a target cell for handover, and a second cell identified by the second cell identifier is: a cell that a UE can access after the handover of the UE to the first cell fails; and sending the handover command to the UE.