Base Station Cell Splitting Handover Reestablishment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the process of cell splitting or merging in active antenna systems, handover failures can occur when a UE is transferred to a cell that is being split or merged, leading to reestablishment failures due to the appearance or disappearance of cells, and existing solutions do not adequately address these issues.
Innovation Solution
The base station notifies neighboring base stations about changes in cell coverage, such as cell splitting or merging, and prepares reestablishment cell information, ensuring that necessary information is available for successful handovers and preventing reestablishment failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cell splitting or merging is performed dynamically to satisfy traffic demands, then system capacity and coverage flexibility are improved, but handover failures and reestablishment failures occur when UE is transferred to cells that are being split or merged
Solution Approach 1:
The source base station prepares reestablishment cell information in advance before handover execution. When cell splitting or merging is正在进行, the source eNB pre-configures alternative target cell information (such as neighboring cells) that the UE can use for reestablishment if the original handover target becomes unavailable. This preliminary preparation ensures that even if the handover target cell disappears or becomes inaccessible during the process, the UE has pre-configured fallback options to maintain connectivity.
2Device complexity
If cell splitting or merging is performed with large temporal granularity (changing once per hour or longer), then system complexity is reduced, but coverage adjustment responsiveness to traffic demands deteriorates
Solution Approach 1:
The system enables dynamic cell splitting and merging operations where cells can be created, modified, or removed in real-time based on traffic conditions. The base station can dynamically adjust cell configurations, activate/deactivate cells, and modify cell coverage areas without requiring lengthy reconfiguration periods. This dynamic capability allows the network to rapidly respond to changing traffic demands while the pre-prepared reestablishment information maintains handover reliability throughout these dynamic changes.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Embodiments of the present disclosure provide an information interaction method, a base station and a communication system. The information interaction method includes: a first base station notifies a second base station that a second cell is deployed and a first cell is to be shrunk in coverage; and the first base station receives a handover request transmitted by the second cell for handing a UE over to the first cell, the handover request includes reestablishment cell information containing at least information on the second cell. With the embodiments of the present disclosure, not only a reestablishment failure will not be resulted after a handover failure, but also signaling overhead may be saved.