Source Base Station Handover Decision Mechanism
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Solution Overview
Problem
Handover procedures in LTE networks face delays due to prolonged transmission times of measurement reports, leading to potential handover failures, especially in uplink scenarios where resource limitations and lack of priority scheduling cause signaling delays.
Innovation Solution
Implementing a mechanism in the source radio base station to analyze and decide on handovers based on incomplete measurement reports if the transmission time exceeds a predefined threshold, with key information prioritized in the initial segments of the report to ensure timely handover decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the source radio base station waits for the complete measurement report before making a handover decision, then the measurement report accuracy is improved, but the handover delay increases and handover failure rate increases
Solution Approach 1:
The measurement report is divided into multiple segments transmitted at different times. The source radio base station can process handover decisions using the first segment (which contains critical information) without waiting for subsequent segments, thus reducing handover delay while maintaining essential measurement accuracy.
Solution Approach 2:
The first segment of the measurement report is transmitted and processed in advance before the complete report is available. This preliminary action allows the handover decision to be made based on partial information, significantly reducing the overall handover time while still capturing the most critical measurement data.
2Loss of time
If the source radio base station makes handover decisions based on incomplete measurement reports, then the handover delay is reduced, but the measurement report accuracy deteriorates
Solution Approach 1:
The first segment of the measurement report is designed to contain the most critical and essential measurement information needed for handover decisions. By ensuring high quality and completeness in this initial segment, the system can make accurate handover decisions without requiring the entire report, thus reducing delay while maintaining decision accuracy.
3Reliability
If handover messages are transmitted with strict delay requirements, then the handover reliability is improved, but the service performance deteriorates when delays occur
Solution Approach 1:
By making handover decisions based on the first segment of the measurement report in advance, the system proactively reduces handover delay. This preliminary action ensures that handover procedures are initiated sooner, improving both reliability and service performance by preventing delays that would otherwise cause handover failures and service degradation.
Data Source
AI summary
The invention relates to a method in a source radio base station (14) for enabling a handover of a connection to a user equipment (13) from a source cell (11) to a target cell (17). The source radio base station (14) serves the source cell (11) and is comprised in a radio communications network (100). The source radio base station receives (802) at least a first segment of a measurement report from the user equipment (13), which measurement report indicates received signal power of signals of neighboring cells. The source radio base station then determines (803) a transmission time of the segment of the measurement report and compares (804) the transmission time with a predefined time threshold value. When the transmission time has exceeded the time threshold value, the source radio base station determines (806) whether to perform the handover based on the at least first segment of the measurement report.