MDT Measurement Logging via Blacklist and Whitelist Cell Filtering
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Solution Overview
Problem
In the context of minimization of drive tests (MDT) technology, especially in unlicensed frequency and non-ground networks, challenges arise due to contention-based access, where multiple operators' base stations share the same carrier, leading to PCI conflicts and limited measurement capabilities, which hinder power saving and network optimization.
Innovation Solution
A method for reporting MDT information is developed, where a terminal receives configuration information to log and report measurements, including best cell unsuitability, PCI conflicts, and other relevant data, and a network device generates and transmits blacklist and whitelist cell lists to guide the terminal's measurement operations, ensuring optimal network optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal measures multiple cells in idle state to improve network optimization, then the network quality assessment capability is improved, but the terminal power consumption increases and measurement capability is limited
Solution Approach 1:
The network device pre-generates blacklist cell lists and whitelist cell lists before the terminal performs measurements. These lists are transmitted to the terminal in advance, enabling the terminal to prioritize measurements on whitelist cells and skip blacklist cells, thus reducing overall measurement burden and power consumption while maintaining network optimization effectiveness
Solution Approach 2:
The patent segments the measurement task by dividing cells into different categories (blacklist, whitelist, and other cells). This segmentation allows the terminal to focus measurement resources on high-priority whitelist cells while avoiding low-priority or harmful blacklist cells, effectively reducing total measurement load and power consumption
2Measurement precision
If the terminal measures cells from multiple operators on the same carrier to improve network optimization, then the network optimization capability is improved, but PCI conflicts occur causing measurement errors
Solution Approach 1:
The network device performs preliminary analysis of PCI configurations across multiple operators and pre-identifies potential PCI conflict cells. These problematic cells are added to the blacklist cell list and transmitted to the terminal before measurement begins, preventing the terminal from attempting measurements that would result in PCI conflicts and measurement errors
Solution Approach 2:
The patent introduces an intermediary mechanism (blacklist/whitelist cell lists transmitted by the network device) that mediates between the terminal's measurement capabilities and the complex multi-operator environment. This intermediary provides guidance on which cells are safe to measure, eliminating PCI conflict issues without limiting the terminal's ability to perform useful measurements
3Measurement precision
If the terminal logs and reports detailed MDT information to improve network optimization, then the network quality assessment capability is improved, but the signaling overhead and processing complexity increase
Solution Approach 1:
The patent extracts only the most critical measurement information (logged measurements from whitelist cells and abnormal events from blacklist cells) for reporting, rather than requiring the terminal to log and report all measurements. This extraction approach maintains network quality assessment capability while significantly reducing signaling overhead and processing complexity
Data Source
AI summary
Embodiments of the present disclosure provide a reporting method and a configuration method for minimization of drive tests information, a terminal and a network device. The reporting method applied to a terminal side comprises: receiving configuration information sent by a network device for a minimization of drive tests information report; creating, according to the configuration information, a measurement log regarding minimization of drive tests information; and reporting to the network device, the measurement log regarding the minimization of drive tests information.