Secondary Base Station RRC Control for Dual Connectivity Handover
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Solution Overview
Problem
In 3GPP LTE-A heterogeneous networks, the integration of small cells with macro cells for dual connectivity often results in inefficient handover processes, leading to communication performance deterioration due to the centralized control of the RRC layer in macro base stations, which limits the effective use of small cells.
Innovation Solution
A wireless communication system where a first wireless base station controls the RRC layer of a secondary base station, allowing direct communication between the mobile station and the secondary base station, thereby enabling handover and reducing the load on the core network by permitting the secondary base station to process and transmit control plane signals independently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the RRC layer is centralized in macro base stations for dual connectivity, then control simplicity is maintained, but handover efficiency deteriorates and small cell utilization is limited
Solution Approach 1:
The patent segments the control plane functionality by allowing the secondary base station to independently process and transmit control plane signals for handover, rather than requiring all control signals to route through the master base station. This segmentation enables the secondary base station to directly control connection between the mobile station and itself, improving handover efficiency while maintaining overall system coordination.
2Stability of the object's composition
If control plane signals are routed through the master base station, then centralized control is maintained, but signaling overhead to the core network increases
Solution Approach 1:
The patent extracts the control plane signal processing function from the master base station and assigns it to the secondary base station. This allows control plane signals related to handover to be processed and transmitted directly by the secondary base station, reducing the signaling overhead to the core network while maintaining centralized control architecture through the master base station's overall coordination role.
3Stability of the object's composition
If handover control is centralized in macro base stations, then system stability is maintained, but handover failure rate increases
Solution Approach 1:
The patent enables the secondary base station to prepare and transmit control plane signals in advance for handover operations. By allowing the secondary base station to independently process handover control signals, the system reduces handover preparation time and increases handover reliability, while the master base station maintains overall system stability through coordinated control.
Data Source
AI summary
A mobile station includes: a communication circuitry configured to communicate with a plurality of base stations utilizing radio resources provided by a first base station and a second base station connected via a network interface; and a controller configured to be capable to configure with a first signaling radio bearer between the mobile station and the first base station and a second signaling radio bearer between the mobile station and the second base station simultaneously.