UE MDT Logging Timer for Battery and Memory Optimization
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Solution Overview
Problem
Current Minimization of Drive Tests (MDT) in wireless communication systems require periodic measurements by user equipment (UE), leading to unnecessary battery consumption and memory usage, especially when the network does not support MDT, as UE continues to log and store measurements indefinitely.
Innovation Solution
Implementing a method where the UE receives an MDT configuration with a validity timer in RRC connected mode, logs measurements in RRC idle mode, and discards the configuration when the timer expires, preventing persistent MDT measurements and optimizing memory usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continues to log and store MDT measurements indefinitely, then the measurement data is available for network optimization, but the battery consumption increases and memory resources are wasted
Solution Approach 1:
The patent applies dynamics by making the MDT measurement logging dynamic rather than static. The UE transitions between different logging states based on timer expiration and network commands. The validity timer dynamically controls the logging duration, and the UE can switch between logging and non-logging states, optimizing energy consumption while maintaining measurement capability when needed.
Solution Approach 2:
The patent implements discarding and recovering by allowing the UE to discard MDT configuration and stop logging when the validity timer expires, thereby saving battery energy. The measurement logging capability can be recovered when the network sends a new MDT configuration or a resumption command, allowing the UE to resume logging when measurement data is again needed for network optimization.
2Quantity of substance
If the UE continuously logs MDT measurements in RRC idle mode, then comprehensive coverage data is collected, but the memory usage increases unnecessarily when the network does not support MDT
Solution Approach 1:
The patent applies feedback mechanisms where the network provides MDT configuration commands to the UE that include validity timers and logging control instructions. The UE receives feedback from the network about whether MDT logging should continue or stop. When the network does not support MDT or does not send continuation commands, the UE stops logging based on timer expiration, preventing unnecessary memory usage while maintaining the capability to log when needed.
3Reliability
If the UE performs MDT measurements indefinitely, then network coverage optimization can be continuously improved, but the service quality and available memory are negatively affected
Solution Approach 1:
The patent implements periodic action by having the UE perform MDT measurements during specific periods defined by the validity timer rather than continuously. The measurement logging occurs periodically when the timer is running, and stops when the timer expires. This periodic approach allows network coverage optimization during designated periods while reducing the impact on service quality and memory resources during non-logging periods.
Data Source
AI summary
A method and apparatus of reporting logged measurements in a wireless communication system is provided. A user equipment in a Radio Resource Control (RRC) connected mode receives Minimization of Drive Tests (MDT) configuration from a base station and starts a validity timer upon receiving the MDT configuration. The user equipment in an RRC idle mode logs measurements based on the MDT configuration to collect logged measurements while the validity timer is running. When the validity timer is expired, the user equipment discards the MDT configuration.