Base Station Handover Manager Prevents Ping-Pong Effects
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Solution Overview
Problem
Current mobile communication systems face performance degradation due to unnecessary handovers, particularly in overlapping regions between cells, as they lack effective information from neighbor cells to optimize handovers, leading to frequent and inefficient changes in base stations.
Innovation Solution
A base station apparatus and method that utilizes handover information from neighbor cells to detect and prevent unnecessary handovers by correcting handover parameters, ensuring the mobile station performs a normal handover without unnecessary cell changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handover is performed in overlapping regions between cells, then mobility and communication continuity are maintained, but unnecessary frequent handovers occur causing ping-pong phenomenon
Solution Approach 1:
The system performs preliminary actions by having the current base station transmit handover history information to the target base station before the handover is executed. This allows the target base station to evaluate whether to accept the handover based on historical data, preventing unnecessary handovers before they occur.
Solution Approach 2:
The system implements feedback by having the target base station evaluate handover history information and provide feedback on whether the handover should be executed. This feedback mechanism prevents ping-pong handovers by using historical data to make informed decisions about handover acceptance.
2Reliability
If handover history information is transmitted from current base station to target base station, then unnecessary handovers are prevented, but information exchange complexity increases
Solution Approach 1:
The system extracts only the necessary handover history information (such as handover count, timing, and target cell identifiers) from the complex handover data, transmitting only the essential elements needed for evaluation to reduce information exchange complexity while maintaining handover optimization capability.
3Productivity
If handover parameters are corrected based on detected unnecessary handovers, then performance degradation is prevented, but handover control complexity increases
Solution Approach 1:
The system changes handover parameters (such as handover threshold, hysteresis margin, or timing advance) based on detected unnecessary handovers. By adjusting these parameters dynamically, the system prevents performance degradation while managing control complexity through standardized parameter modification procedures.
Data Source
AI summary
An apparatus and method for handover in a mobile communication system enables a Mobile Station (MS) to perform a normal handover without performing an unnecessary handover. A Base Station (BS) apparatus capable of preventing an unnecessary handover includes a handover manager. The handover manager receives handover information, including information about at least one cell through which an MS has passed, from a neighbor cell to determine whether the MS has performed an unnecessary handover. If it is determined that the MS has performed an unnecessary handover, the handover manager notifies the occurrence of the unnecessary handover by the MS to the neighbor cell.