MDT Cycle Synchronization with DRX for Wireless Terminals
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Solution Overview
Problem
Conventional drive tests for radio network optimization are costly and time-consuming, and the Minimization of Drive Test (MDT) method faces challenges in minimizing power consumption during radio channel measurements in idle mode, as terminals must activate their receivers frequently, leading to inefficiencies.
Innovation Solution
Synchronizing the radio channel measurement interval with the Discontinuous Reception (DRX) cycle to reduce power consumption by matching the MDT cycle with the DRX cycle, allowing measurements only during DRX periods and skipping or recording previous results when cycles mismatch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal performs MDT measurements in idle mode, then radio channel information is collected for service area optimization, but power consumption increases due to frequent receiver activation
Solution Approach 1:
The patent applies periodic action by configuring the terminal to perform MDT measurements at specific periodic intervals defined by MDT measurement configurations. The terminal activates its receiver only at predetermined measurement time points rather than continuously, collecting radio channel information periodically while minimizing power consumption during non-measurement periods.
Solution Approach 2:
The patent applies preliminary action by pre-configuring MDT measurement parameters, measurement intervals, and reporting conditions before the terminal enters idle mode. The network side provides MDT measurement configurations in advance, allowing the terminal to plan its measurement activities and activate the receiver only when necessary, thus reducing unnecessary power consumption.
2Use of energy by moving object
If the terminal synchronizes MDT measurement cycle with DRX cycle, then power consumption is reduced by minimizing receiver activations, but measurement flexibility is limited
Solution Approach 1:
The patent applies dynamics by making the MDT measurement cycle configurable and adaptable. The network side can dynamically adjust MDT measurement configurations based on service requirements, and the terminal can adapt its measurement cycle to match DRX cycles when in idle mode. This dynamic configuration allows the system to optimize power consumption by synchronizing with DRX while maintaining the flexibility to adjust measurement intervals according to different service scenarios.
3Loss of information
If conventional drive test is performed manually, then detailed radio environment information is collected, but time and cost increase significantly
Solution Approach 1:
The patent applies self-service by enabling User Equipments (UEs) to autonomously perform radio channel measurements and collect MDT information while in idle mode. Instead of requiring manual drive tests with specialized equipment, ordinary terminals automatically measure radio environment parameters such as reference signal received power (RSRP) and reference signal received quality (RSRQ), then report this information to the network. This self-service approach eliminates the need for dedicated drive test vehicles and personnel, significantly reducing both time and cost while collecting comprehensive radio environment data from multiple user perspectives.
Data Source
AI summary
An apparatus and method for matching the radio channel measurement timing of Minimization of Drive Test (MDT) cycle with timings of the Discontinuous Reception (DRX) cycle are provided. The radio channel measurement method of a terminal according to the present invention includes configuring a DRX cycle, receiving a Minimization of Drive Test (MDT) cycle, comparing the DRX cycle and the MDT cycle, measuring, when the MDT cycle is an integer multiple of the DRX cycle, the radio channel at DRX timings matching with MDT timings, and storing a result of the measurement.