MDT Logging With IDC Flagging in RRC Idle and Inactive Modes
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Solution Overview
Problem
The challenge of performing minimization of driving test (MDT) logging operations is exacerbated by in-device coexistence (IDC) problems in wireless communication systems, particularly in 5G and IoT environments, where multiple radio technologies operate simultaneously, leading to interference and suboptimal network performance.
Innovation Solution
A method and apparatus for performing MDT logging by configuring a user equipment (UE) to log measurements in RRC idle or inactive modes, including an IDC flag when an IDC problem is detected, and transmitting the logged measurements to a base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MDT logging is performed in connected modes only, then measurement data can be collected continuously, but network resources are consumed and device complexity increases
Solution Approach 1:
The patent enables MDT logging to dynamically adapt to different RRC states (connected, idle, inactive). The logging function is activated conditionally based on the device's current state and IDC problem detection, allowing the system to transition between different operational modes rather than maintaining a fixed connected-mode-only approach. This reduces device complexity by enabling logging in lower-power states without requiring continuous connection maintenance.
2Adaptability or versatility
If multiple radio technologies operate simultaneously in device, then communication versatility is improved, but in-device coexistence interference occurs
Solution Approach 1:
The patent implements a feedback mechanism where the device monitors for IDC problems and automatically adjusts MDT logging behavior in response. When IDC interference is detected, the system modifies logging parameters or suspends logging to prevent further interference. This closed-loop feedback approach allows the system to maintain communication versatility while dynamically mitigating the harmful interference effects through adaptive logging control.
3Object-generated harmful factors
If MDT logging is suspended during IDC problems, then interference is reduced, but measurement data collection is lost
Solution Approach 1:
The patent employs preliminary action by pre-configuring MDT logging parameters and thresholds before IDC problems occur. The system establishes logging rules, measurement configurations, and interference detection criteria in advance, so that when IDC problems arise, the pre-established framework can quickly adapt without causing data loss. This preparatory configuration enables rapid response while maintaining measurement continuity.
4Loss of energy
If logging is performed in RRC idle or inactive modes, then network resource consumption is reduced, but measurement precision may be affected
Solution Approach 1:
The patent applies local quality by tailoring measurement configurations specifically for idle and inactive modes rather than using uniform settings across all states. The system adjusts measurement parameters, logging intervals, and reporting thresholds according to the characteristics of each RRC state, optimizing for lower resource consumption in idle/inactive modes while maintaining adequate measurement precision through state-appropriate configuration.
Data Source
AI summary
The present disclosure relates to a method performed by a user equipment (UE) in a wireless communication system. The method may include receiving, from a base station (BS), configuration information associated with a logged minimization of driving test (MDT), and performing measurement logging in a plurality of logging intervals, based on the configuration information when the UE transitions to an idle state or an inactive state. The performing of the measurement logging may include, when reportType is set to eventTriggered, detecting whether an in-device coexistence (IDC) problem has occurred in a last logging interval from among the plurality of logging intervals while the measurement logging is performed, and when it is detected that the IDC problem has occurred, logging a flag indicating the occurrence of the IDC problem.