Minimization of Drive Tests for Delay-Critical Services
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Solution Overview
Problem
Current Minimization of Drive Tests (MDT) methods in wireless communication systems do not accurately collect information on discarded packets, which are critical for assessing the quality of service in delay-sensitive services like intelligent transportation systems, leading to potential failures in delivering important information.
Innovation Solution
A method and apparatus for performing MDT by receiving and transmitting messages between wireless communication nodes to determine data packet discard rate and packet discard delay, using a Protocol Data Unit (PDU) session with Quality of Service Flow (QF) split across multiple nodes, and incorporating a Packet Delay Budget (PDB) for measurement periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current MDT methods are used for network optimization, then general coverage issues can be discovered, but accurate service quality estimation for delay-sensitive services cannot be achieved
Solution Approach 1:
The patent applies preliminary action by configuring the wireless communication device to collect discarded packet information in advance through MDT measurements before actual service quality degradation occurs. The network node pre-configures measurement parameters including packet delay budget thresholds, enabling the device to proactively monitor and report discarded packets based on timing criteria, thus preparing accurate service quality data before critical failures happen.
Solution Approach 2:
The patent implements feedback by establishing a closed-loop measurement and reporting mechanism. The wireless communication device continuously monitors packet transmission timing, compares actual delays against configured thresholds, and feeds back discarded packet information to the network node. This feedback enables the network to accurately estimate service quality and adjust parameters to prevent future packet loss.
2Reliability
If packet transmission monitoring is enhanced for delay-critical services, then service quality can be accurately assessed, but system complexity increases
Solution Approach 1:
The patent applies universality by designing the MDT measurement system to serve multiple functions simultaneously. The same measurement framework monitors both general coverage quality and specific delay-critical service performance. The network node uses unified configuration parameters that work across different service types, reducing the need for separate complex monitoring systems while maintaining high reliability for delay-sensitive applications.
Solution Approach 2:
The patent uses parameter changes to manage complexity by dynamically adjusting measurement thresholds based on service requirements. The network node configures packet delay budget parameters that can be modified without changing the fundamental measurement architecture. This allows the system to adapt to different service reliability requirements while maintaining a relatively simple base measurement system.
Data Source
AI summary
A method and apparatus for a Minimization of Drive Tests (MDT) for delay-critical services is disclosed. In one embodiment, a method for performing a Minimization of Driver Test (MDT) by a first wireless communication node, includes: receiving a first message from a second wireless communication node; and determining at least one of the following: a data packet discard rate and a packet discard delay according to the first message, wherein the first message comprises a MDT configuration, wherein the MDT configuration indicates a measurement of at least one of the following: the data packet discard rate and the packet discard delay, wherein the MDT configuration comprises at least one of the following: a measurement period and a first Packet Delay Budget (PDB).