UE MDT Measurement Configuration Management Across PLMN Changes
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Solution Overview
Problem
Current wireless communication systems face challenges in minimizing drive tests measurements, leading to unnecessary configuration and logging issues when a UE switches between PLNMs, resulting in inefficient network optimization and increased power consumption.
Innovation Solution
A method for handling minimization of drive tests measurements involves validating or invalidating the measurement configuration based on UE registration and detach procedures, ensuring that the configuration is maintained or cleared appropriately to avoid reconfiguration and power wastage, particularly when switching between PLNMs or performing detach procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE clears MDT measurement configuration and stops measurement log due to PLMN change, then the network can avoid storing outdated measurement data, but the network needs to reconfigure MDT measurement configuration for the UE again and waits for the UE to collect measurement logs
Solution Approach 1:
The patent changes the parameter for determining configuration validity from strict PLMN code matching to operator identification through MCC/MNC comparison. This allows the UE to maintain MDT measurement configuration across PLMN changes within the same operator, avoiding unnecessary reconfiguration and reducing network optimization time while ensuring measurement data remains valid.
2Productivity
If the UE maintains MDT measurement configuration across PLMN changes, then the network optimization process is accelerated, but the UE may collect measurement logs from unauthorized networks
Solution Approach 1:
The patent implements a feedback mechanism where the UE receives authorization status information from the network during PLMN selection or registration procedures. The UE uses this feedback to determine whether to maintain or clear MDT measurement configuration, ensuring that measurement logs are only collected from authorized networks while enabling rapid network optimization across PLMN changes within the same operator.
3Adaptability or versatility
If the UE performs detach procedure to a network, then the UE can switch to a different network, but the MDT measurement configuration is invalidated and measurement logs are cleared
Solution Approach 1:
The patent applies preliminary action by having the UE store measurement logs in a buffer before the detach procedure is completed. When the detach procedure occurs, the UE first preserves the measurement log data, then clears the configuration. This ensures that network switching capability is maintained while preventing loss of measurement log information, as the preserved logs remain available for network optimization even after the detach.
Data Source
AI summary
A method of handling minimization of drive tests, hereafter called MDT, measurement for a mobile device in a wireless communication system is disclosed. The method includes registering to a first public land mobile network, and maintaining MDT measurement configuration when the UE registers to a second public land mobile network belonging to an operator as the first public land mobile network is, or the UE is in coverage of the first public land mobile network but registering to no public land mobile network.