Logged Drive Test Reporting for Wireless Networks
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in logged Minimization of Drive Tests (MDT) reporting due to the lack of visibility into measurement configuration changes during a user equipment's (UE) idle mode, leading to unnecessary reconfiguration and resource waste when the UE reconnects to the network.
Innovation Solution
The UE reports a 'pre-Measurement Configuration' along with the availability indication, allowing the network to compare and potentially reconfigure or discontinue MDT data collection based on changed settings, reducing redundant signaling and resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network reconfigures MDT measurement settings every time the UE reconnects, then the network can ensure up-to-date configuration, but it causes redundant signaling and wastes resources
Solution Approach 1:
The UE performs preliminary action by storing the measurement configuration in its local memory before entering idle mode. When the UE reconnects, it retrieves and transmits this pre-stored configuration information to the network, eliminating the need for the network to reconfigure everything from scratch and thus reducing redundant signaling.
Solution Approach 2:
The UE provides feedback to the network by transmitting the stored measurement configuration information upon reconnection. This feedback mechanism allows the network to compare the current configuration with the previously stored one and determine whether reconfiguration is actually necessary, thereby avoiding unnecessary resource expenditure while ensuring configuration reliability.
2Reliability
If the network stores all measurement configurations for every UE, then it can manage configuration changes effectively, but it increases network storage requirements and complexity
Solution Approach 1:
The invention extracts the measurement configuration storage function from the network and relocates it to the UE's local memory. The UE is responsible for storing and managing its own configuration information, while the network only needs to store minimal metadata about configuration changes. This extraction significantly reduces network storage requirements and complexity while maintaining effective configuration management capability.
3Loss of information
If the UE continuously monitors and stores measurement data in idle mode, then it can provide comprehensive measurement reports, but it consumes UE battery power and resources
Solution Approach 1:
The UE performs preliminary action by storing only the measurement configuration parameters in its local memory during idle mode, rather than continuously storing actual measurement data. This approach preserves the necessary configuration information for later reporting while minimizing power consumption, as the UE only needs to store lightweight configuration data rather than continuous measurement streams.
Data Source
Figure 1~2
Figure 3
Figure 4A~4B
AI summary
A network receives from a user equipment UE information about a measurement configuration used to log test measurements; and the network uses the received information to determine further signaling to send to the UE concerning further test measurements. The network can compare the received measurement configuration to a measurement configuration for the further test measurements; and if the same can merely indicate to the UE to continue using the same configuration else if different can indicate to the UE the new configuration to use for the further measurements. The UE logs the test measurements taken in the IDLE mode. After exiting the IDLE mode it sends to the network with which it connects information about the measurement configuration used to collect the measurements. The information can be sent in a RRC Connection Setup Complete message along with an availability indictor that the logged test measurements are available.