Logged MDT Reporting Indicator for Wireless Measurement Overhead
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, particularly in 3GPP LTE, the Minimization of Drive Tests (MDT) process incurs significant costs and resource consumption due to the need for periodic driving tests using user equipment (UE) to measure coverage, with logged MDT measurements being unnecessary for UE memory and service quality, and there is a lack of efficient methods to report these measurements without affecting available memory and service quality.
Innovation Solution
A method and apparatus for a user equipment (UE) to log MDT measurements in RRC idle mode based on received configurations and transmit a logging indicator upon transitioning to RRC connected mode, allowing for periodic reporting of logged measurements to the base station, reducing overhead and enabling network-requested measurement delivery at desired times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If logged MDT measurements are stored in UE memory, then measurement data is available for network analysis, but available memory and service quality are affected
Solution Approach 1:
The patent segments the measurement reporting process into two distinct modes: logged MDT for storing measurements in idle mode, and immediate MDT for reporting in connected mode. This segmentation allows the network to request measurements at appropriate times without continuously occupying UE memory, thus resolving the contradiction between measurement data availability and available memory.
Solution Approach 2:
The patent implements preliminary action by having the UE perform measurements and store them in a logging buffer during idle mode before the network actually needs them. The measurements are pre-captured and stored with indicators, so when the network requests logged measurements, the data is already prepared and ready for transmission, eliminating the need for continuous memory allocation during active service.
2Quantity of substance
If UE transitions from RRC connected mode to RRC idle mode for logging measurements, then memory resources are freed, but reporting timing becomes less controllable
Solution Approach 1:
The patent implements feedback mechanisms where the network sends configuration messages indicating when and what measurements to perform, and the UE provides feedback through logging indicators and measurement reports. The network can request logged measurements at specific times by sending appropriate signaling, thus maintaining timing control despite the UE being in idle mode during measurement collection.
3Loss of time
If immediate MDT is used in RRC connected mode, then reporting timing is controlled, but signaling overhead increases
Solution Approach 1:
The patent merges the advantages of both logged and immediate MDT by allowing the UE to perform measurements in idle mode (reducing signaling overhead) while maintaining the ability to report at network-controlled times (preserving timing control). The measurement collection and reporting functions are combined into a unified framework that operates across RRC state transitions.
Data Source
AI summary
A method and apparatus of reporting logged measurements of an user equipment in a wireless communication system is provided. The user equipment in a Radio Resource Control (RRC) connected mode receives from a base station a Minimization of Drive Tests (MDT) configuration. The user equipment transitions from the RRC connected mode to an RRC idle mode and logs measurements based on the MDT configuration. The user equipment transmits to the base station a logging indicator indicating an availability of the logged measurement.