Source Base Station SDL Cell Filtering for Handover KPIs
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Solution Overview
Problem
In wireless communication networks, especially with 5G technology, the lack of awareness about Supplementary Downlink (SDL) cells at source base stations leads to unnecessary handover requests, resulting in degradation of handover Key Performance Indicators (KPIs) and overall network efficiency.
Innovation Solution
The method involves receiving and updating SDL cell information for neighboring base stations in a neighbor cell table maintained by the source base station. This information is used to determine whether a handover request is intended for an SDL cell, thereby avoiding the triggering of handover requests for SDL cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the source base station processes all handover requests without filtering, then the handover processing is simple and fast, but handover preparation KPIs degrade due to unnecessary requests for SDL cells
Solution Approach 1:
The source base station pre-populates the neighbor cell table with SDL cell information before handover requests are generated. This preliminary action enables the system to identify and filter out SDL cells from handover requests before they are processed, preventing unnecessary handover preparation attempts and improving handover preparation KPIs without adding significant processing complexity during the actual handover decision-making phase.
Solution Approach 2:
The system implements a feedback mechanism where the target base station provides information about SDL cells to the source base station. This feedback loop allows the source base station to learn which neighboring cells are SDL cells and adjust its handover request filtering accordingly, improving handover reliability while maintaining processing efficiency through adaptive learning rather than complex real-time analysis.
2Reliability
If the source base station filters handover requests for SDL cells, then handover preparation KPIs improve, but the system complexity increases due to additional information management
Solution Approach 1:
The neighbor cell table is designed to serve multiple functions: it stores standard neighbor cell information for normal handover operations and simultaneously stores SDL cell identification information for filtering purposes. This multi-functionality approach allows the system to improve handover preparation KPIs through SDL cell filtering without requiring a separate data structure or additional complex management systems, thereby limiting the increase in overall system complexity.
Solution Approach 2:
Instead of creating a complex real-time detection system to identify SDL cells, the system uses a simplified copy of the neighbor cell table that contains pre-collected SDL cell information. This copying approach allows the source base station to make quick filtering decisions based on pre-stored information rather than performing complex real-time analysis, improving handover reliability while keeping the system relatively simple.
3Measurement precision
If SDL cell information is collected from all neighboring base stations, then the accuracy of SDL cell identification improves, but the information collection overhead increases
Solution Approach 1:
The system implements a progressive information collection strategy where SDL cell information is gathered from neighboring base stations in stages rather than all at once. The source base station can start with information from immediate neighbors and gradually expand to include more distant neighbors as needed. This partial action approach maintains acceptable SDL cell identification accuracy while significantly reducing the time and overhead associated with collecting information from all possible neighboring base stations.
Data Source
AI summary
The present disclosure relates to techniques for preventing outgoing Handover requests for SDL cells from the source BS. In one implementation, a predefined configuration of SDL-frequency for the SDL cell is provided to the source base station. In another implementation, SDL cell information is provided in one or more Information Element(s). In yet another implementation, the source base station may receive update about the SDL cell information from an SMO framework. Post receiving the SDL cell information, the source base station may update its neighbour cell table. In case, the source base station receives the measurement report shared by UE for handover and the measurement report contains request for SDL cell then, based on the updated information in the neighbour cell table, source base station may not trigger the HO request for the SDL cell and HO KPIs degradation may be avoided.