MDT Configuration Handling in Dual Connectivity Scenarios
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Solution Overview
Problem
Current systems lack the ability to efficiently handle logged minimization drive test (MDT) configurations in dual connectivity scenarios, particularly in handling MDT configurations for both master cell groups (MCG) and secondary cell groups (SCG) across different radio access technologies (RATs).
Innovation Solution
A method where a wireless device receives MDT configurations for both MCG and SCG, logs measurements in idle or inactive states, and transmits reports after transitioning to a connected state, ensuring seamless handling of MDT configurations across different RATs during cell reselection and handover events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If normal RRM mechanisms are used for measurements, then measurements can be reported when UE has RRC connection with the cell, but this restricts measurements to be collected from UEs not experiencing radio link failure and experiencing sufficient UL coverage
Solution Approach 1:
The patent applies preliminary action by configuring the UE to perform measurements and log them in advance during idle/inactive states, before the UE establishes an RRC connection or experiences radio link failure. This allows measurement collection to occur proactively in scenarios where normal RRM mechanisms would not activate, thereby expanding measurement coverage to include UEs experiencing RLF and insufficient UL coverage.
2Loss of information
If normal RRM mechanisms are used, then measurements can be collected, but there is no accompanying location information in normal RRM measurements
Solution Approach 1:
The patent merges the measurement collection function with the location information collection function by integrating GNSS location data acquisition into the same measurement logging mechanism. The UE is configured to simultaneously log both measurement data and location information in the measurement log, thereby eliminating the loss of location information while maintaining a unified measurement mechanism.
3Quantity of substance
If MDT configurations are handled in dual connectivity scenarios, then comprehensive MDT data can be collected for both MCG and SCG, but the system complexity increases due to multiple RATs and cell groups
Solution Approach 1:
The patent applies segmentation by separating the MDT configuration handling into distinct components: MCG configuration and SCG configuration, each with their own specific parameters and procedures. The UE is configured to handle MCG and SCG measurements separately, logging MCG measurements when connected to master cells and SCG measurements when connected to secondary cells, thereby managing complexity through structured separation while enabling comprehensive data collection.
Data Source
AI summary
A method (1200) performed by a wireless device (110) includes receiving (1202), from a network node (160), a Minimization of Drive Test, MDT, configuration for a master cell group, MCG, and a secondary cell group, SCG. While the wireless device is in an idle state or an inactive state and operating according to a first Radio Access Technology, RAT, the wireless device logs (1204) MDT measurements for the MCG and the SCG based on the MDT configuration. After transitioning from the idle or inactive state to a connected state and after handover from a source cell associated with the first RAT to a target cell associated with a second RAT, the wireless device transmits (1206) at least one MDT report to a target network node associated with the target cell.