Base Station Configuration Notification for X2 Interface Overhead Reduction
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Solution Overview
Problem
In mobile communication systems with inter-base station carrier aggregation, the overhead on the X2 interface increases due to unnecessary information being transmitted during configuration changes between base stations, as both base stations notify each other of all configuration details, even if they remain unchanged.
Innovation Solution
Implement a method where the first base station notifies the second base station of a configuration change request including desired setting information, and after determining the settings to be applied to the user apparatus, only the differences in configuration between the original and final settings are notified, reducing the amount of information transmitted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If all configuration details are transmitted between base stations during configuration changes, then both base stations can ascertain final configurations, but the overhead on the X2 interface increases due to unnecessary information being transmitted
Solution Approach 1:
The patent extracts only the essential configuration information (MCG configuration and SCG configuration) that needs to be transmitted between base stations, separating it from unnecessary information. This is achieved by having the first base station transmit only the MCG configuration and the second base station transmit only the SCG configuration, rather than transmitting all configuration details, thereby reducing X2 interface overhead while maintaining configuration completeness
Solution Approach 2:
The configuration information is segmented into two distinct parts: MCG (Master Cell Group) configuration managed by the first base station and SCG (Secondary Cell Group) configuration managed by the second base station. Each base station transmits only its relevant segment, avoiding redundant transmission of the other base station's configuration data, thus reducing overall information volume while ensuring both stations receive necessary configuration details
2Reliability
If configuration change information is transmitted between base stations, then proper control can be performed, but the signaling overhead increases
Solution Approach 1:
The patent extracts and transmits only the specific configuration parameters that are essential for control operations (MCG and SCG configurations), removing redundant configuration information. This extraction approach maintains the reliability needed for proper control while simplifying the signaling flow by reducing the amount of data that needs to be processed and transmitted between base stations
Data Source
AI summary
An information notification method in a mobile communication system including a first base station and a second base station that perform communication with a user apparatus by inter-base station carrier aggregation, including a step in which the first base station notifies the second base station of a configuration change request including first desired setting information; a step in which the second base station notifies the first base station of second desired setting information; a step in which the first base station determines first setting information and second setting information to be set to the user apparatus, and notifies the user apparatus of the first setting information and the second setting information; and a step of, after completion of setting of the first setting information and the second setting information to the user apparatus, notifying the second base station of information on the setting.