UE Measurement Logging Across Cell Transitions
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Solution Overview
Problem
In wireless communication systems, particularly in 3GPP LTE, minimization of driving tests (MDT) configurations are not effectively managed when a user equipment (UE) moves from one cell to another, leading to redundant configurations and discarded measurement logs, as the existing techniques do not provide a method for handling multiple MDT configurations or reporting measurement results across cell transitions.
Innovation Solution
A user equipment (UE) is configured to receive and manage multiple measurement configurations, discarding the old configuration upon receiving a new one, allowing for seamless transition and logging of measurement data across different cells, including logging intervals, reference times, and area configurations, even in RRC idle mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE receives multiple MDT configurations from different cells, then the network coverage can be optimized through comprehensive measurement, but the UE cannot apply multiple configurations simultaneously leading to discarded configurations and measurement logs
Solution Approach 1:
The patent segments the handling of multiple MDT configurations by cell identity. The UE maintains separate measurement logs for each cell, labeled with the cell's identity. When moving between cells, the UE discards only the log for the current cell while preserving logs for other cells. This segmentation allows comprehensive measurement across multiple cells without losing all configuration information.
Solution Approach 2:
The patent introduces dynamic configuration management where the UE actively tracks which cell sent which MDT configuration. When the UE receives a new MDT configuration in a different cell, it dynamically updates the current cell's configuration while preserving historical configurations from other cells. This dynamic approach enables the UE to adapt to cell changes while maintaining valuable measurement history.
2Ease of operation
If the UE discards the first MDT configuration upon receiving a second configuration, then the UE can apply only one configuration at a time, but measurement logs from the first configuration are lost
Solution Approach 1:
The patent segments measurement logs by cell identity, creating separate log stores for each cell. The UE maintains a mapping between cell identities and their corresponding MDT configurations and logs. This segmentation allows the UE to discard only the active configuration for the current cell while preserving logs from previous cells, thereby retaining valuable measurement time data.
Solution Approach 2:
The patent applies selective discarding and recovering. The UE discards the MDT configuration for the current cell when receiving a new configuration in a different cell, but recovers and preserves the measurement logs from the discarded configuration. These recovered logs remain available for network analysis, effectively recovering the value of time spent on measurements.
3Reliability
If the service provider performs frequent driving tests for coverage optimization, then network coverage can be accurately measured, but a lot of costs and resources are consumed
Solution Approach 1:
The patent enables the UE to perform self-service measurement logging. Instead of requiring physical driving tests with dedicated equipment, the UE uses its own measurement capabilities to collect coverage data automatically during normal operation. The UE logs measurement results according to MDT configurations and makes this data available to the network, eliminating the need for expensive professional driving test equipment while maintaining coverage optimization reliability.
Solution Approach 2:
The patent creates a copy of the measurement logging functionality within the UE. Rather than physically replicating driving test equipment, the UE copies the essential measurement and logging functions, performing coverage optimization tasks using its built-in sensors and processing capabilities. This virtual copying approach dramatically reduces the resource consumption associated with physical driving tests.
Data Source
AI summary
A method and apparatus for performing measurements logging in a mobile communications system is provided. An user equipment receives a first measurement configuration message including a first measurement configuration and receives a second measurement configuration message. The user equipment discards the first measurement configuration upon receiving the second measurement configuration message.