Uplink Packet Delay Measurement for QoS Verification
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Solution Overview
Problem
Current MDT (Minimization of Drive Tests) specifications in mobile communication systems lack a mechanism for verifying Quality of Service (QoS), which is crucial for optimizing user experience and identifying areas of deteriorated QoS.
Innovation Solution
A communication control method and user terminal that measure uplink packet delay and associate radio access bearers with QoS characteristics, enabling QoS verification by comparing measured delays with threshold values and reporting deteriorations to the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If drive test with measurement vehicle is used to optimize base station coverage, then measurement accuracy is improved, but man-hours and cost increase significantly
Solution Approach 1:
The patent uses user terminals (mobile phones) as copies of the measurement vehicle's measurement equipment. Instead of deploying expensive measurement vehicles, ordinary user terminals perform measurements, replicating the measurement function at much lower cost and without requiring dedicated measurement personnel.
Solution Approach 2:
User terminals perform self-measurement of signal quality and QoS parameters. The terminals automatically collect measurement data without requiring external measurement vehicles or personnel, enabling the system to serve itself for measurement purposes.
2Productivity
If MDT specification is used to automate measurement by user terminal, then man-hours and cost are reduced, but QoS verification capability is lost
Solution Approach 1:
The patent segments the measurement process into separate functional modules: signal quality measurement, QoS parameter measurement (throughput, packet delay), and location information acquisition. Each module can be independently configured and executed, allowing comprehensive QoS verification while maintaining automation.
Solution Approach 2:
User terminals perform multiple functions simultaneously: they act as both communication devices and measurement instruments. The terminals measure not only signal quality but also QoS parameters (throughput, packet delay) and location information, making the measurement system universal and multi-functional.
3Ease of operation
If user terminal measures signal quality only, then measurement simplicity is maintained, but QoS verification is insufficient for user experience optimization
Solution Approach 1:
The patent merges multiple measurement functions (signal quality measurement, QoS parameter measurement including throughput and packet delay, and location information acquisition) into a unified measurement framework. This combination maintains operational simplicity while comprehensively capturing QoS information needed for user experience optimization.
Data Source
AI summary
A communication control method used in a mobile communication system supporting immediate MDT (Minimization of Drive Test) includes a user terminal in a radio resource control (RRC) connected state in a cell of the base station receiving an instruction from a base station, acquiring, in the RRC connected state, location information indicating a location of the user terminal based on the instruction from the base station, and measuring an uplink packet delay of uplink communication with the base station. The radio access bearers of the user terminal are associated with Quality of Service (QoS) characteristics to perform QoS control. The user terminal in the RRC connected state compares the measured uplink packet delay with a packet delay threshold value and determines whether to transmit a report to the base station based on result of the comparison. The report indicates the measured uplink packet delay.