User Equipment MDT Logging Across Radio Access Technologies
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Solution Overview
Problem
In heterogeneous wireless communication networks, optimizing coverage across different radio access technologies (RATs) is challenging due to varying service areas and channel characteristics, as existing methods require terminals to stop measurement reporting when switching between RATs, leading to incomplete network optimization.
Innovation Solution
A method and apparatus for user equipment (UE) to receive and log minimization of drive tests (MDT) configurations from one RAT, transmit logging indicators to another RAT, and continue MDT measurements and reporting, even when the RAT changes, allowing for continuous network optimization across multiple RATs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the terminal stops measurement reporting when switching between RATs, then the measurement process is simplified, but the network optimization completeness deteriorates
Solution Approach 1:
The terminal is designed to perform MDT measurements universally across multiple RATs (E-UTRAN, UTRAN, GERAN) rather than being limited to a single RAT. The measurement capability is made multi-functional to operate in heterogeneous network environments, allowing continuous measurement reporting regardless of RAT changes.
Solution Approach 2:
The terminal pre-configures measurement parameters and criteria before switching between RATs. By preparing measurement configurations in advance and maintaining measurement states across RAT boundaries, the terminal ensures continuous measurement reporting without interruption during RAT transitions.
2Reliability
If the terminal continues MDT measurements across RAT changes, then the network optimization effectiveness is improved, but the device complexity increases
Solution Approach 1:
The measurement management functions across different RATs are merged into a unified process. The terminal combines measurement configurations, logging, and reporting mechanisms for E-UTRAN, UTRAN, and GERAN into a single integrated MDT framework, reducing the complexity of managing separate measurement systems for each RAT.
Solution Approach 2:
The terminal autonomously manages measurement continuity across RAT changes by self-configuring measurement parameters and automatically maintaining measurement states. The device performs self-service measurement management without requiring complex external coordination, simplifying the overall system complexity.
3Measurement precision
If driving tests are performed frequently to optimize coverage, then the coverage optimization accuracy is improved, but the resource consumption increases
Solution Approach 1:
The terminal performs self-service MDT measurements and automatically reports coverage information to the network. This eliminates the need for operator-performed driving tests, significantly reducing resource consumption while maintaining continuous coverage optimization through automated terminal-based measurements.
Solution Approach 2:
The terminal acts as a mobile measurement platform, copying the functionality of traditional driving test vehicles. By using widely distributed terminals instead of dedicated test vehicles, the system achieves continuous coverage measurement with minimal resource consumption while maintaining high measurement precision.
Data Source
AI summary
The present invention relates to a method and apparatus for reporting a logged measurement in a wireless communication system. A terminal receives a minimization of drive tests (MDT) configuration from a cell of a first radio access technology (RAT), and logs a measurement based on the MDT configuration so as to collect the logged measurements. The terminal transmits a logging indicator, which indicates the availability of the logged measurements, to a cell of a second RAT.