Multi-Frequency Measurement Reporting for Wireless Handover
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Solution Overview
Problem
In wireless communication systems using multiple frequencies, existing methods for handover between base stations are inefficient due to the need for prolonged time to receive measurement reports from terminals, which hinders quick decision-making for handover operations.
Innovation Solution
A terminal apparatus equipped with an event detecting section and a measurement report creating section that transmits measurement reports indicating radio conditions of multiple frequencies to the base station, allowing the base station to quickly decide on handover decisions based on these reports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal transmits measurement reports for multiple frequencies separately, then the base station can make accurate handover decisions, but the handover time is prolonged
Solution Approach 1:
The patent combines measurement reports for multiple frequencies into a single transmitted report. The terminal apparatus integrates measurement results from the first frequency (where handover is determined) and the second frequency (used for communication) into one measurement report, which is then transmitted to the base station in a single operation. This merging eliminates the need for separate transmission operations while preserving all necessary measurement data for accurate handover decisions.
Solution Approach 2:
The terminal apparatus performs preliminary measurement and integration of multi-frequency data before handover execution. By preparing the combined measurement report in advance and having it ready for immediate transmission when handover conditions are met, the system reduces the actual handover execution time while ensuring comprehensive measurement data is available for decision-making.
2Reliability
If the terminal measures and reports radio conditions on multiple frequencies, then handover decisions become more accurate, but the device complexity increases
Solution Approach 1:
The terminal apparatus utilizes its existing multi-frequency measurement capabilities, which were originally designed for other purposes such as signal quality monitoring and network optimization. By repurposing these existing measurement functions to also support handover decisions, the system achieves more accurate handover control without adding dedicated new hardware or complex specialized components for multi-frequency handover measurement.
Data Source
AI summary
When detecting occurrence of an event for transmitting a measurement report of a radio condition of a cell at a frequency set for a base station apparatus, to the base station apparatus (3) communicating with a terminal apparatus (2), the terminal apparatus (2) in a wireless communication system (1) creates a measurement report including information indicating radio conditions of cells at a frequency at which the event occurred and at another different frequency. The base station apparatus (3) controls whether or not to perform handover of the terminal apparatus (2) to another cell, on the basis of the measurement report transmitted from the terminal apparatus (2). Thereby, there is provided a wireless communication system in which a base station apparatus and the terminal apparatus are communicable with each other using multiple frequencies, the wireless communication system being capable of shortening time required for handover.