AMF Event Report Handover Using Last Status Context Transfer
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Solution Overview
Problem
In 5G networks, redundant event reports are transmitted during inter-AMF mobility procedures, leading to incorrect information and improper decrementing of report counts, as the new AMF lacks awareness of the last reported status from the old AMF.
Innovation Solution
A method where the source AMF includes an indication of the last reported event status in the UE context transferred to the target AMF, allowing the target AMF to determine if the current event status has changed, and only transmit updated reports if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the new AMF transmits event reports without checking the last reported status from the old AMF, then the event reporting service is simple to implement, but redundant reports are generated leading to incorrect information and improper report count decrementing
Solution Approach 1:
The source AMF performs preliminary action by including the last reported event status indication in the UE context before transferring it to the target AMF. This preliminary inclusion of status information enables the target AMF to make informed decisions about whether to transmit updated reports, preventing redundant reports while maintaining implementation simplicity.
Solution Approach 2:
The mechanism establishes a feedback loop where the source AMF provides feedback information (last reported event status indication) to the target AMF through the UE context transfer. This feedback enables the target AMF to accurately determine whether event status has changed and avoid transmitting redundant reports, thereby improving report accuracy without significant complexity increase.
2Productivity
If the new AMF does not have awareness of the last reported status, then the mobility procedure is fast and simple, but redundant event reports are transmitted causing incorrect information and improper report count management
Solution Approach 1:
The solution merges the last reported event status indication with the UE context transfer message. By combining these two elements into a single transfer operation, the patent maintains the efficiency of the mobility procedure while ensuring that status information is preserved and transmitted to the target AMF, preventing information loss.
Solution Approach 2:
The UE context acts as an intermediary carrier that transports the last reported event status indication from the source AMF to the target AMF. This intermediary mechanism enables efficient information transfer during mobility procedures without requiring separate communication channels, thus maintaining productivity while preventing information loss.
3Speed
If the AMF transfers complete UE context without filtering, then the context transfer is simple and fast, but unnecessary event status information is transmitted increasing network traffic and processing load
Solution Approach 1:
The patent extracts and isolates the critical piece of information (last reported event status indication) from the complete UE context. By extracting only this specific status information rather than transferring the entire context, the system reduces network traffic volume and processing load while maintaining the speed of context transfer through efficient targeted data transmission.
Data Source
AI summary
The present disclosure provides methods for managing an event report for a user equipment served by a first NF node. The method is implemented at the first NF node, and comprises in response to receiving, from a second NF node, a UE context transfer request when the UE moves to be served by the second NF node, including in first UE context an indication indicating an event status of the UE for a first subscribed event that is reported last, and transmitting the first UE context to the second NF node. The present disclosure further discloses corresponding NF nodes for implementing the method and corresponding computer readable medium.