Dual Connectivity Handover Bearer Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems, particularly in LTE, lack a desirable mechanism for mobile control during dual connectivity, leading to inefficiencies and increased processing load during handovers between multiple base stations.
Innovation Solution
A wireless communication method that allows a wireless station to maintain dual connectivity by selectively handling data bearers between base stations during handovers, avoiding unnecessary data bearer transfers and reducing redundant processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a handover mechanism is implemented in dual connectivity scenarios, then mobile control capability is improved, but processing load and procedure complexity increase
Solution Approach 1:
The patent segments the data bearer handling during handover by distinguishing between MCG (Master Cell Group) bearers and SCG (Secondary Cell Group) bearers. The source base station selectively transfers only MCG bearers to the target base station, while SCG bearers are maintained separately through the secondary connectivity. This segmentation resolves the contradiction by enabling mobile control through structured handover procedures while reducing processing load by avoiding unnecessary transfer of all bearers.
2Reliability
If all data bearers are transferred during handover, then connection continuity is improved, but handover procedure complexity and time increase
Solution Approach 1:
The patent divides data bearers into two categories: MCG bearers that require transfer to the target base station for continuity, and SCG bearers that are maintained through the secondary connectivity path. This segmentation enables the system to maintain connection continuity for critical bearers while avoiding the time-consuming transfer of non-critical SCG bearers, thus resolving the contradiction between reliability and handover time.
Solution Approach 2:
The patent establishes the dual connectivity structure and SCG bearer configuration before the handover occurs. By pre-configuring the secondary connectivity path and identifying which bearers are SCG bearers, the system prepares in advance for the selective transfer scenario, reducing the actual handover execution time while maintaining continuity for essential bearers.
3Productivity
If selective data bearer handling is implemented, then handover efficiency is improved, but device complexity increases
Solution Approach 1:
The patent introduces clear segmentation between MCG and SCG bearers with distinct handling rules. The source base station identifies SCG bearers and selectively transfers only MCG bearers, while the target base station receives and activates only the transferred bearers. This structured segmentation improves handover efficiency by reducing transfer scope while maintaining manageable device complexity through well-defined roles and procedures for each base station.
Data Source
AI summary
A wireless communication method including: when a wireless station has dual connectivity to a first base station that is a primary base station and a second base station that is a secondary base station and when a handover of the primary base station is to be performed from the first base station to a third base station, transmitting from the first base station to the third base station a first signal requesting the handover, when the third base station makes a determination not to change the secondary base station based on the first signal, transmitting from the third base station to the second base station a second signal indicating the determination and to the first base station a third signal indicating the determination, and performing the handover based on the third signal without transferring a connection between the wireless station and the second base station to the first base station.