Wireless Measurement Reporting for Handover Optimization
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Solution Overview
Problem
In wireless communication systems, the increasing density of base stations leads to frequent and unnecessary handovers due to multiple neighbor cells with stronger signal strengths, causing radio link failures, communication quality deterioration, and resource wastage.
Innovation Solution
A method where a terminal transmits a measurement report message to a base station including signal strength information of multiple cells, including the first cell triggering the report and the best neighbor cell, along with predicted signal strengths, to enable the base station to determine a more accurate target cell for handover, thereby reducing unnecessary handovers and improving communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal transmits measurement reports frequently when multiple neighbor cells have stronger signal strengths, then the base station can make handover decisions, but unnecessary handovers occur causing radio link failures and communication quality deterioration
Solution Approach 1:
The patent combines measurement information from multiple neighbor cells into a single measurement report message. The terminal identifies the first cell triggering the report and the second cell with the highest signal strength, then transmits both pieces of information together in one report to the base station, enabling comprehensive handover decision-making without multiple separate reports.
Solution Approach 2:
The patent implements a feedback mechanism where the terminal continuously monitors signal strengths of neighbor cells and provides updated measurement reports to the base station. The base station uses this feedback information to make informed handover decisions, selecting the optimal target cell based on current signal conditions rather than triggering handovers on every signal fluctuation.
2Reliability
If the base station waits for the best neighbor cell to trigger an event before handover, then handover accuracy improves, but the terminal must sustain communication with the serving cell having poor link state for longer period
Solution Approach 1:
The patent enables preliminary handover preparation by transmitting measurement reports that include information about the second cell (best neighbor cell) even before it triggers a handover event. The base station can prepare handover resources in advance for the optimal target cell, reducing the actual handover execution time and minimizing the period the terminal must maintain poor link quality with the serving cell.
3Loss of information
If the terminal transmits measurement report messages frequently within short intervals, then the base station receives updated information, but radio resources are unnecessarily utilized and other data transmission is delayed
Solution Approach 1:
The patent makes the measurement report message multi-functional by including both the first cell information (triggering cell) and second cell information (best neighbor cell) in a single report structure. This universal report format provides comprehensive measurement data for multiple cells simultaneously, eliminating the need for separate report messages and reducing radio resource consumption while maintaining information freshness.
Data Source
AI summary
A method of a terminal may comprise: receiving, from a serving cell, a first message including measurement report configuration information; in response to transmission of a measurement report message being triggered based on the first message, generating a measurement report message; and in response to a measurement report message transmission condition configured by the first message being satisfied, transmitting the measurement report message to the serving cell.