MME MDT Configuration Transmission for Handover Reliability
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Solution Overview
Problem
In wireless communication systems, User Equipment (UE) cannot perform Minimization of Drive-Tests (MDT) measurements when the serving cell is initially absent from the cell list in MDT measurement configuration parameters, leading to a lack of necessary configuration parameters during intra-eNB handovers, which prevents MDT measurements from being conducted.
Innovation Solution
The Mobility Management Entity (MME) determines whether the serving cell is included in the cell list information of the MDT measurement configuration parameters and transmits these parameters to the base station serving the UE when a match is found, ensuring the UE receives the necessary configuration for MDT measurements upon entering a cell within the list.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the MME transmits MDT measurement configuration parameters only when the serving cell is in the cell list, then the signaling overhead is reduced, but the UE cannot perform MDT measurements after intra-eNB handover to a cell in the list
Solution Approach 1:
The MME proactively transmits MDT measurement configuration parameters to the target eNB during handover preparation before the UE actually enters the target cell. This preliminary action ensures that when the UE hands over to a cell in the MDT cell list, the configuration parameters are already available at the target eNB, enabling immediate MDT measurement capability without requiring additional signaling after handover.
2Reliability
If the MME continuously monitors UE serving cell changes to transmit MDT parameters, then MDT measurement capability is maintained, but the system complexity increases
Solution Approach 1:
The target eNB acts as an intermediary that receives and stores MDT measurement configuration parameters from the MME during handover preparation. When the UE hands over to this target cell, the eNB already has the parameters ready to transmit to the UE. This intermediary approach eliminates the need for the MME to continuously monitor UE location changes, significantly reducing system complexity while maintaining reliable MDT measurement capability.
3Adaptability or versatility
If the MME transmits MDT parameters to all eNBs in the cell list, then any UE handover to these cells is supported, but the signaling overhead increases
Solution Approach 1:
Instead of uniformly transmitting MDT configuration parameters to all eNBs in the cell list, the system applies local quality by transmitting parameters selectively to specific target eNBs based on actual handover events. The MME transmits parameters only to the eNB that is the actual target of a handover, rather than pre-configuring all possible target eNBs. This localized approach maintains full adaptability for supporting any UE handover to cells in the list while minimizing signaling overhead by avoiding unnecessary transmissions to eNBs that are not actual handover targets.
Data Source
AI summary
Embodiments of the present application discloses a method, system and apparatus for transmitting Minimization of Drive-Tests (MDT) measurement configuration parameters, relate to the field of wireless communications and address the problem that a User Equipment (UE) can not perform MDT measurement when the UE is configured by the network side to perform MDT measurement. In the present application, a Mobility Management Entity (MME) receives MDT measurement configuration parameters of a user equipment transmitted from a Home Subscriber Server (HSS); the MME determines whether cell list information in the MDT measurement configuration parameters includes information of a cell controlled by a base station controlling a serving cell of the user equipment; and the MME transmits the MDT measurement configuration parameters to the base station serving the user equipment when the result of determination is YES. With the invention, the problem of the UE failing to perform MDT measurement can be avoided.