Dual Connectivity Handover via Secondary Node Failure Feedback
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Solution Overview
Problem
In dual connectivity wireless communication systems, mobility robustness optimization is challenging due to inconsistent mobility control parameters between master and secondary access points, leading to issues like too-early or incorrect handovers, especially in small cell environments, where the master eNB uses its own parameters inconsistent with single connectivity mode, and adjustments at the secondary eNB are slow and lack SCG mobility failure information.
Innovation Solution
A method and apparatus for controlling dual connectivity by determining and communicating cell change failure information from communication devices to the secondary access point for use in mobility control, allowing the secondary access point to adjust its configuration based on both single and dual connectivity mobility failure information, and synchronizing mobility control parameters between master and secondary access points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the master eNB uses its own mobility control parameters for dual connectivity, then the master eNB can independently control mobility, but the parameters become inconsistent with single connectivity mode leading to mobility errors
Solution Approach 1:
The patent changes the mobility control parameters from master eNB to secondary eNB in dual connectivity mode. The secondary eNB uses the same mobility control parameters as in single connectivity mode, ensuring consistency and eliminating errors like too-early or wrong handovers while maintaining independent control capability through the coordinated architecture.
2Reliability
If mobility control parameters are adjusted at the secondary eNB, then mobility robustness can be improved, but the adjustments are slow and lack SCG mobility failure information
Solution Approach 1:
The patent implements a feedback mechanism where the user equipment reports SCG mobility failure information directly to the secondary eNB. This enables the secondary eNB to quickly receive accurate failure information and rapidly adjust mobility control parameters, significantly improving both the speed and accuracy of mobility robustness optimization.
3Device complexity
If the secondary eNB lacks SCG mobility failure information, then the architecture remains simple, but mobility robustness optimization cannot be effectively performed
Solution Approach 1:
The patent introduces the user equipment as an intermediary that collects SCG mobility failure information and forwards it to the secondary eNB. This intermediary role enables the secondary eNB to obtain necessary failure information without complex direct monitoring infrastructure, maintaining architectural simplicity while enabling effective mobility robustness optimization.
Data Source
AI summary
Methods and apparatuses for controlling dual connectivity in a communication system are disclosed. Information on at least one failure in relation to a cell change of a communication device connected to a master access point and a secondary access point is determined. The determined information is communicated to the secondary access point. The secondary access point uses the information in mobility control.