PCell-PSCell Mobility Reporting for Robust Dual Connectivity Handover
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Solution Overview
Problem
There is no established MRO mechanism in 3GPP LTE and 5G systems for handling PCell changes with PSCell changes in multi-radio dual connectivity scenarios, particularly in near-failure cases where underlying issues during successful PCell and PSCell changes are not addressed.
Innovation Solution
Implement a configuration mechanism for user equipment (UE) to store and report successful handover and PSCell change reports, including trigger conditions and thresholds for both master and secondary cell groups, allowing network nodes to optimize mobility configurations based on these reports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PCell change with PSCell change procedure is implemented in MR-DC scenarios, then mobility capability is improved, but there is no established MRO mechanism to handle near-failure cases
Solution Approach 1:
The patent segments the MRO mechanism into separate report types: Successful Handover Reports (SHR) for PCell changes and Successful PSCell Change Reports (SPC) for PSCell changes. This segmentation allows independent optimization and handling of each cell group's mobility events without requiring a complex unified mechanism.
Solution Approach 2:
The patent creates a universal reporting framework where the UE can generate both SHR and SPC reports using similar procedures and configurations. The network can then process these reports through a unified MRO mechanism that handles both MCG and SCG mobility events, reducing overall system complexity while maintaining comprehensive coverage.
2Measurement precision
If separate reports (SHR and SPC) are configured for PCell and PSCell changes, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by configuring specific trigger conditions and measurement parameters tailored to each report type. SHR configurations focus on PCell handover metrics while SPC configurations focus on PSCell change metrics, allowing optimized measurement precision for each cell group without requiring the device to handle all possible measurement types simultaneously.
3Manufacturing precision
If detailed trigger conditions are configured for MCG and SCG, then mobility optimization precision is improved, but configuration complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring trigger conditions and measurement parameters for both SHR and SPC reports before mobility events occur. The network can set up event-triggered reporting with specific thresholds and conditions in advance, eliminating the need for complex real-time configuration decisions during handover or PSCell change events.
Data Source
AI summary
Embodiments of the present application relate to methods and apparatuses of a mobility robustness optimization (MRO) mechanism for a primary cell (PCell) change with a primary secondary cell (PSCell) change procedure. According to an embodiment of the present application, a source master node (MN) includes a transceiver and a processor coupled to the transceiver; and the processor is configured to transmit a configuration via the transceiver to a user equipment (UE), wherein the configuration is used for storing or reporting one of: a successful handover report (SHR) and a successful PSCell change (SPC) report; and a first report including information regarding a successful completion of a PCell change with PSCell change procedure, and wherein the configuration includes at least one of: first configuration for a set of trigger conditions associated with a master cell group (MCG); or second configuration for a set of trigger conditions associated with a secondary cell group (SCG).