LTE-NR Dual Connectivity Measurement Carrier Coordination
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Solution Overview
Problem
During dual connectivity between LTE and NR systems, there is a challenge in coordinating measurement report operations between the master node (eNB) and the secondary node (gNB), leading to potential conflicts in configuration settings and measurement priorities.
Innovation Solution
The proposed solution involves coordinating the measurement configuration settings between the eNB and gNB, allowing them to independently control their RRC entities while ensuring that the UE can perform appropriate measurement report operations without exceeding its measurement capacity. This is achieved by sharing information on the number of carriers to be measured and assigning priorities to measurement objects and reports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the master node and secondary node independently configure measurement settings, then each node can control its own RRC entity autonomously, but configuration conflicts and measurement capacity overload occur
Solution Approach 1:
The master node performs preliminary action by notifying the secondary node of the number of carriers it will measure before the secondary node configures its measurement settings. This advance notification allows the secondary node to plan its measurement configuration to avoid exceeding the UE's total measurement capacity, preventing configuration conflicts while maintaining independent RRC control.
2Quantity of substance
If the UE measures all configured carriers from both master and secondary nodes, then comprehensive measurement coverage is achieved, but the UE exceeds its measurement capacity
Solution Approach 1:
The secondary node changes the parameter of measurement configuration by selectively configuring measurement objects for carriers that do not cause the total number of measured carriers to exceed the UE's measurement capacity. This dynamic adjustment of measurement configuration parameters ensures comprehensive coverage within operational limits.
3Adaptability or versatility
If the secondary node configures measurements without coordination, then measurement configuration flexibility is maintained, but measurement report operations become inappropriate or conflicting
Solution Approach 1:
The master node provides feedback to the secondary node about its measurement configuration plans (number of carriers to measure). This feedback mechanism allows the secondary node to adjust its configuration to ensure measurement report accuracy and avoid conflicts, while still maintaining configuration flexibility through coordinated decision-making.
Data Source
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AI summary
An object of the present invention is to provide a radio communication system and a user device capable of performing appropriate measurement report operations, even during dual connectivity (DC) of LTE (eNB) and NR (gNB). The eNB (100A) includes a first RRC controlling unit that performs control in RRC layer and a first measurement controlling unit that controls reception quality measurement of a target cell performed by the user device. The gNB (100B) includes a second RRC controlling unit that performs control in the RRC layer and a second measurement controlling unit that controls reception quality measurement of a target cell performed by the user device. The first measurement controlling unit shares information on the number of carriers to be measured with the second measurement controlling unit.