Dual Connectivity Measurement Control via Base Station Segmentation
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Solution Overview
Problem
In dual connectivity scenarios of LTE systems, conventional measurement control methods fail to provide appropriate measurement configuration information for user apparatuses, as they are based on single-base station assumptions, leading to inadequate cell addition, removal, and change operations in secondary cell groups (SCG).
Innovation Solution
A method where the second base station determines parameters for measurement configuration information and transmits them to the first base station, which then generates and transmits this information to the user apparatus, allowing for separate threshold and offset settings for master and secondary cell groups, enabling appropriate measurement control in inter-base-station carrier aggregation systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional measurement control methods based on single base station assumptions are used in dual connectivity scenarios, then the system complexity is reduced and ease of operation is maintained, but measurement configuration information cannot be appropriately provided for user apparatuses leading to inadequate cell addition, removal, and change operations in secondary cell groups
Solution Approach 1:
The measurement control function is segmented between master base station and secondary base station. The secondary base station determines measurement parameters for SCG cells, while the master base station transmits measurement configuration information to the user apparatus. This segmentation enables appropriate measurement control for dual connectivity without requiring complete redesign of the entire measurement control system.
Solution Approach 2:
The master base station acts as an intermediary between the secondary base station and the user apparatus. The secondary base station provides measurement parameters to the master base station, which then incorporates these parameters into measurement configuration information transmitted to the user apparatus. This intermediary role enables coordinated measurement control across multiple base stations.
2Measurement precision
If separate threshold and offset settings are implemented for master and secondary cell groups in dual connectivity, then measurement precision for cell management is improved, but the complexity of parameter configuration and control increases
Solution Approach 1:
Different measurement parameters (thresholds and offsets) are configured locally for master cell group and secondary cell group respectively. The secondary base station determines parameters specifically for SCG cells, while the master base station manages parameters for MCG cells. This local quality approach enables precise measurement control for each cell group without requiring uniform parameter settings across the entire system.
Solution Approach 2:
Measurement parameters are segmented into master cell group parameters and secondary cell group parameters. Each base station manages its own parameters independently, allowing for precise local optimization while maintaining overall system coordination through the master base station's role in transmitting consolidated measurement configuration information.
Data Source
AI summary
A measurement control method in a mobile communication system is provided. The mobile communication system includes a first base station and a second base station which perform communications with a user apparatus by using inter-base-station carrier aggregation. The measurement control method includes a measurement instruction step of determining, by the second base station, a parameter used for measurement configuration information for the user apparatus and transmitting measurement instruction information including the parameters to the first base station; and a measurement configuration information providing step of generating, by the first base station which has received the measurement instruction information, the measurement configuration information in which the parameter included in the measurement instruction information is set, and transmitting the measurement configuration information to the user apparatus.