Radio Terminal Measurement Reporting Across Radio Access Technologies
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Solution Overview
Problem
In the context of Minimization of Drive Tests (MDT), radio terminals face challenges in continuously obtaining measurement information when moving between cells of different Radio Access Technologies (RATs, as existing methods discard stored measurement information during cell reselection, which is crucial for coverage optimization across various RATs.
Innovation Solution
A radio communication system and method where a radio terminal is notified to report measurement information from one RAT cell to another and instructed to obtain new measurements in the second cell, ensuring continuous data collection without discarding previous data, by using notification and instruction mechanisms to manage measurement reporting and acquisition across different radio access technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the radio terminal discards stored measurement information during cell reselection to different RATs, then the device complexity is reduced, but the loss of information increases
Solution Approach 1:
The patent applies preliminary action by having the network side (source base station) proactively instruct the radio terminal to report measurement information before the terminal actually moves to the target cell. This advance instruction ensures that measurement data is preserved and reported without requiring the terminal to maintain complex storage and management mechanisms across RAT boundaries, thus reducing device complexity while preventing information loss
Solution Approach 2:
The patent uses the network side (source base station and target base station) as an intermediary to manage measurement information flow. Instead of requiring the radio terminal to autonomously manage and preserve measurement data across RAT changes, the network coordinates the reporting process, transferring measurement information from terminal to network in a controlled manner, thereby reducing the terminal's device complexity while ensuring information is not lost
2Measurement precision
If the radio terminal continuously collects measurement information across different RATs, then the measurement precision is improved, but the use of energy increases
Solution Approach 1:
The patent applies partial action by having the radio terminal perform measurement collection only when specifically instructed by the network side. Instead of continuously measuring across all RATs, the terminal measures selectively based on network requests, achieving sufficient measurement precision for mobility optimization while significantly reducing energy consumption compared to continuous measurement approaches
3Reliability
If the radio terminal reports measurement information after moving to target cell, then the reliability is improved, but the loss of time increases
Solution Approach 1:
The patent applies preliminary action by having the source base station issue reporting instructions to the radio terminal before the terminal completes its move to the target cell. This advance instruction ensures that the terminal is prepared to report measurement information immediately upon arrival, maintaining high reliability for mobility management decisions while minimizing the time delay compared to waiting until after the terminal has fully settled in the target cell
Data Source
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AI summary
The present invention is a radio communication system that a radio terminal obtains measurement information indicated by a radio network in an idle state, and reports the obtained measurement information in an active state, the radio communication system comprising: a first radio station managing a first cell of a first radio access technology comprises in the first cell; notification means configured to notify the radio terminal of the first configuration information related to obtainment of the measurement information in the first cell; and instruction means configured to instruct the radio terminal to report information related to the measurement information obtained in the first cell after the radio terminal moves to a second cell of a second radio access technology different from the first radio access technology.