Mobile Station Scell Activation for Inter-eNB CA
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Solution Overview
Problem
In the LTE system, especially during Inter-eNB CA, the radio base station MeNB faces complexity in monitoring and determining the activation timing of Scells under the control of a different radio base station SeNB, leading to complications in scheduling and resource management.
Innovation Solution
A mobile station with a controlling unit that autonomously activates Scells under the control of the secondary radio base station SeNB, allowing for Inter-eNB CA without requiring the master radio base station MeNB to monitor the active state, and initiates a random access procedure when necessary, enabling efficient scheduling timing notification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the master radio base station MeNB monitors the active state of Scells under the control of secondary radio base station SeNB, then the activation timing of Scell can be determined, but the implementation complexity of MeNB increases
Solution Approach 1:
The mobile station autonomously activates the Scell under the control of SeNB without requiring MeNB to monitor or determine the activation timing. The mobile station independently manages the activation state and notifies SeNB through uplink transmission, thereby eliminating the need for MeNB involvement in Scell activation monitoring and reducing MeNB implementation complexity
Solution Approach 2:
The system divides the monitoring and control responsibilities: MeNB handles Pcell activation while the mobile station autonomously handles Scell activation under SeNB control. This segmentation separates the functions so that MeNB does not need to monitor Scell states, reducing its complexity while ensuring proper activation timing notification to the relevant base station
2Device complexity
If the mobile station autonomously activates Scell, then the implementation complexity of MeNB is reduced, but the network may not comprehend the appropriate scheduling timing
Solution Approach 1:
The mobile station autonomously activates the Scell and transmits uplink signals to SeNB, providing feedback about the activation state. SeNB can then determine the appropriate scheduling timing based on this uplink transmission, ensuring that scheduling information is not lost while maintaining low MeNB complexity
Solution Approach 2:
The mobile station acts as an intermediary that autonomously activates the Scell and communicates the activation state to SeNB through uplink transmission. This intermediary role ensures that SeNB receives the necessary scheduling timing information without requiring MeNB to monitor or relay this information
3Productivity
If multiple Scells are activated simultaneously under Inter-eNB CA, then the throughput is increased, but the resource management and scheduling complexity increases
Solution Approach 1:
The system segments the resource management responsibilities: MeNB manages Pcell resources while the mobile station autonomously manages Scell activation and SeNB manages Scell-specific scheduling. This segmentation allows multiple Scells to be activated simultaneously for high throughput while distributing the resource management complexity across different entities rather than concentrating it in one base station
Data Source
AI summary
To perform “Inter-eNB CA” without complicating the implementation of a radio base station MeNB. A mobile station UE of the present invention includes a controlling unit 13 configured to, when in “RRC_Connected state” in Pcell that is under the control of the radio base station MeNB, and when Scell that is under the control of a radio base station SeNB has been set, autonomously activate the Scell.