mTRP UE Handover Using a Persistent Assisting Cell
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Solution Overview
Problem
Existing handover procedures in multiple transmission and reception point (mTRP) operations in communication networks face issues such as increased communication overhead, service interruptions, and reduced mobility robustness due to break-before-make radio link failures during handovers, especially when cells are not from the same distributed unit (DU).
Innovation Solution
The proposed solution involves maintaining the connection to the assisting cell during the handover process by utilizing the same assisting cell before and after the handover, either through direct coordination between network nodes or central unit management, thereby reducing the need for additional signaling and enabling continuous data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the target network node selects a new assisting cell after handover finalization, then the mTRP operation can be established at the target node, but communication overhead increases due to additional RRC messages
Solution Approach 1:
The source network node performs preliminary actions by selecting and configuring an assisting cell for the target node before handover finalization. The source node includes assisting cell information in the handover request message to the target node, enabling the target node to have the assisting cell ready before the UE completes handover, thus avoiding additional RRC messaging overhead.
2Reliability
If the target network node selects and configures a new assisting cell after handover, then mTRP operation is established, but service interruption occurs during the setup time
Solution Approach 1:
The assisting cell is selected and configured in advance by the source network node before handover execution. The target node receives the assisting cell information through the handover request message, allowing the mTRP operation to be immediately established upon handover completion without service interruption.
3Ease of operation
If the assisting cell is released at the source network node before handover completion, then the handover procedure can proceed, but mobility robustness is reduced due to break-before-make operation
Solution Approach 1:
The assisting cell maintains continuous operation throughout the handover process. The source network node keeps the assisting cell active and transfers its configuration to the target node, ensuring that the UE can continuously utilize the assisting cell for diversity reception and transmission during the entire handover procedure, thereby maintaining mobility robustness.
Data Source
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AI summary
Inter-alia, methods are disclosed for handover in the multiple transmission and reception point connection of a user equipment in a communication network.