UE Idle Mode Inter-Frequency MDT Logging for Coverage Accuracy
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Solution Overview
Problem
In current wireless communication networks, the Minimization of Drive Tests (MDT) framework may fail to accurately log measurements for cells outside the configured frequency, leading to erroneous coverage maps as the network is not informed of stronger cells not included in the logged MDT report.
Innovation Solution
A method where User Equipment (UE) monitors inter-frequency carriers and cells in idle mode, logs measurements and indicators for stronger cells not configured in the MDT report, and sends these reports to the network node, enabling the generation of accurate coverage maps and optimized configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE logs only MDT measurements for configured cells according to the MDT framework, then the measurement logging process is simple and follows the standard procedure, but the network cannot obtain information about stronger cells outside the configured frequency, leading to erroneous coverage maps
Solution Approach 1:
The UE performs preliminary actions by monitoring inter-frequency carriers and cells continuously in idle mode, even before receiving specific MDT configuration. This allows the UE to detect and log stronger cells that may not be in the configured list, ensuring accurate coverage information is captured in advance without requiring complex real-time configuration changes.
Solution Approach 2:
The UE provides feedback to the network node by including measurement indications in the MDT report, informing the network about stronger cells detected during monitoring. This feedback mechanism allows the network to correct coverage map errors by receiving information about cells outside the configured frequency, improving measurement accuracy without significantly increasing UE complexity.
2Reliability
If the UE monitors and logs all inter-frequency carriers and cells in idle mode, then the network obtains comprehensive coverage information including stronger cells, but the measurement logging process becomes more complex and resource-consuming
Solution Approach 1:
The UE applies local quality by selectively monitoring and logging only the strongest cell detected in each inter-frequency carrier, rather than logging all cells. This approach ensures the network receives accurate coverage information about the strongest cells while minimizing the energy consumption and processing resources required for measurement logging compared to monitoring all cells exhaustively.
3Loss of information
If the UE reports only configured cells in the MDT report, then the report format is simple and compliant with standard procedures, but the network cannot generate accurate coverage maps due to missing information about stronger cells
Solution Approach 1:
The UE acts as an intermediary by introducing measurement indications as additional information elements in the MDT report. These indications serve as a mediator that conveys information about stronger cells to the network without fundamentally changing the report structure or requiring complex processing. The network can use these indications to supplement the standard cell measurement data and generate accurate coverage maps.
Data Source
AI summary
A method performed by a User Equipment (UE) for performing measurement logging related to logged Minimization of Drive Tests (MDT) measurements in a wireless communications network. The UE receives an MDT measurement configuration that relates to logging MDT measurements in one or more inter-frequency carriers and one or more cells. When operating in an idle mode of operation and in a camped normally state, the UE monitors the configured one or more inter-frequency carriers and one or more cells. Based on the monitoring, the UE logs one or more MDT measurements relating to the received configuration, and one or more MDT measurement indications related to one or more other cells that are stronger than the cells in the received configuration. The UE sends a measurement report that comprises one or more of the one or more logged MDT measurements, and the one or more logged MDT measurement indications.