Monitoring Event Configuration Handover Across Shared IWK-SCEF Nodes
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Solution Overview
Problem
In mobility procedures, the transfer of Monitoring Event Configurations (MEC) between old and new SGSN/MME nodes can lead to issues such as data accumulation or incorrect deletion due to unknown or mismatched Interworking Service Capability Exposure Function (IWK-SCEF) usage, affecting monitoring event reporting reliability.
Innovation Solution
A method is introduced where mobile management nodes exchange information about the IWK-SCEF they use, allowing them to determine if they share the same IWK-SCEF, and adjust their signaling accordingly to avoid unnecessary deletion notifications or updates, using existing mobility procedure messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the old SGSN/MME sends deletion notification to IWK-SCEF during mobility procedure, then the MEC is cleared from the old node, but the MEC may be wrongly deleted if the new SGSN/MME uses the same IWK-SCEF node
Solution Approach 1:
The new SGSN/MME provides feedback to the old SGSN/MME about whether it uses the same IWK-SCEF node. This feedback mechanism allows the old SGSN/MME to determine whether to send deletion notification, preventing incorrect deletion of MEC while ensuring proper cleanup when IWK-SCEF nodes are different
Solution Approach 2:
The new SGSN/MME performs preliminary action by informing the old SGSN/MME about its IWK-SCEF usage before the old node sends deletion notification. This preliminary information exchange prevents the timing conflict where deletion notification arrives after MEC has already been updated by the new node
2Reliability
If the new SGSN/MME updates MEC to IWK-SCEF during mobility, then the monitoring event configuration is transferred, but data accumulates on the old IWK-SCEF node if not properly cleaned up
Solution Approach 1:
The feedback mechanism enables the old SGSN/MME to know whether it should perform cleanup of MEC data. When the new SGSN/MME uses a different IWK-SCEF node, the old node receives feedback indicating this and proceeds to delete its local MEC data, preventing accumulation of obsolete information
Solution Approach 2:
The old SGSN/MME discards (deletes) its local MEC data when the new SGSN/MME uses a different IWK-SCEF node. This discarding mechanism prevents data accumulation on the old IWK-SCEF node while ensuring proper resource management
3Reliability
If the old SGSN/MME and new SGSN/MME exchange IWK-SCEF information, then they can determine same/different IWK-SCEF usage, but the signaling complexity increases
Solution Approach 1:
The new SGSN/MME acts as an intermediary by providing information about its IWK-SCEF usage to the old SGSN/MME. This intermediary approach simplifies the overall system by having one node (new SGSN/MME) responsible for providing the information, rather than requiring complex bidirectional verification mechanisms
Solution Approach 2:
The new SGSN/MME self-services by autonomously determining its own IWK-SCEF usage and providing this information to the old SGSN/MME. This self-service approach reduces signaling complexity compared to mechanisms where the old node would need to query or verify the new node's configuration
Data Source
AI summary
Embodiments of the present disclosure provide method and apparatus for monitoring event configuration. A method performed by a first mobile management node comprises receiving information regarding a first interworking service capability exposure function (IWK-SCEF) from a second mobile management node. The method further comprises determining whether the first mobile management node and the second mobile management node use a same IWK-SCEF based on the information regarding the first IWK-SCEF. The method further comprises sending an indication of whether the first mobile management node and the second mobile management node use the same IWK-SCEF to the second mobile management node.