Minimising Drive Test Logging for Inter-Radio Access Technology Frequencies
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently performing Minimising Drive Tests (MDT) by user equipment (UE) in 5G networks, particularly in logging and reporting measurement results for frequencies not indicated in System Information blocks 4 and 5, and managing Quality of Experience (QoE) reporting across different modes and connectivity states.
Innovation Solution
The method involves configuring UE to log measurement results for inter-radio access technology (IRAT) frequencies not indicated in SIB4 or SIB5, introducing fields for logging and reporting these results, and implementing delta signalling for QoE configuration management across various connectivity modes and network architectures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If UE logs measurement results for IRAT frequencies not indicated in SIB4 or SIB5, then measurement coverage is improved, but logging complexity increases
Solution Approach 1:
The patent segments the frequency measurement logging into two distinct parts: frequencies indicated in SIB4/SIB5 (cell reselection frequencies) and frequencies not indicated in these blocks (additional IRAT frequencies). This segmentation allows the UE to handle different frequency sets with different logging requirements, improving measurement coverage while managing complexity through structured organization of measurement objects.
Solution Approach 2:
The network configures the UE in advance with a list of IRAT frequencies to measure and log, including those not indicated in SIB4/SIB5. This preliminary configuration enables the UE to perform measurements on these additional frequencies without real-time complexity, as the measurement objects and logging parameters are pre-established by the network.
2Adaptability or versatility
If QoE reporting is implemented across multiple connectivity modes, then reporting versatility is improved, but system complexity increases
Solution Approach 1:
The patent implements a universal QoE reporting framework that operates across multiple connectivity modes (5G NR, 4G LTE, NCT, non-3GPP access). The same QoE measurement and reporting mechanisms are adapted to work in different access types and connectivity scenarios, allowing versatile multi-mode reporting while avoiding the need for separate complex systems for each mode.
Solution Approach 2:
The QoE reporting system dynamically adapts to the current connectivity mode and network conditions. The UE can switch between different reporting behaviors based on whether it is connected via 5G, 4G, or other access types, and can adjust reporting based on network congestion status. This dynamic adaptation enables versatile multi-mode operation while managing complexity through context-aware behavior.
3Productivity
If data transfer is limited during network congestion, then network performance is improved, but information loss increases
Solution Approach 1:
The network provides feedback to the UE about congestion status and data transfer limitations. Based on this feedback, the UE adjusts its QoE reporting behavior, prioritizing critical information and deferring or compressing non-essential data. This feedback mechanism allows the system to maintain network performance during congestion while minimizing information loss through adaptive reporting strategies.
Solution Approach 2:
The patent changes reporting parameters dynamically based on network conditions. During congestion, the UE can alter parameters such as reporting frequency, data granularity, and prioritization levels. This parameter adaptation allows the system to maintain essential QoE monitoring while reducing overall data transfer volume, thereby protecting network performance while minimizing information loss.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. In an embodiment, a method of performing Minimising Drive Test (MDT) of a user equipment (UE) in a wireless communication system is provided. The method comprises: receiving, from a base station, a configuration including inter radio access technology (IRAT) frequencies; performing measurement on available IRAT frequencies based on the configuration; and logging the measurement results.