NSSF Recovery via AMF Notification for Data Synchronization
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Solution Overview
Problem
In 5G telecommunications networks, there is no defined mechanism for the Network Slice Selection Function (NSSF) to request AMFs to resend updated network slice selection availability information when it goes out of service, leading to discrepancies and potential service outages upon recovery.
Innovation Solution
The NSSF triggers a notification request to AMFs with an optional indication, allowing them to resend updated network slice selection assistance information, which is then processed and distributed to all subscribed AMFs, ensuring data synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the NSSF goes out of service to handle overload or failures, then system stability is improved, but data synchronization between NSSF and AMFs deteriorates
Solution Approach 1:
The NSSF sends a notification request message to AMFs before or during the service disruption, proactively requesting updated availability information. This preliminary action ensures that when the NSSF recovers, it can immediately obtain current data from AMFs without waiting for passive updates, thus resolving the data synchronization issue while maintaining system stability during overload or failure conditions
2Manufacturing precision
If the NSSF processes all service update messages from AMFs, then data accuracy is improved, but system overload increases
Solution Approach 1:
The AMF is designed to autonomously respond to the NSSF's notification request by providing its updated availability information without requiring complex NSSF processing. This self-service approach allows the NSSF to obtain accurate data from AMFs with minimal processing overhead, resolving the contradiction between maintaining data accuracy and avoiding system overload
3Loss of information
If the NSSF requests updated availability information from all AMFs upon recovery, then data synchronization is improved, but communication overhead increases
Solution Approach 1:
The NSSF sends notification request messages to a subset of AMFs or uses optional indications to selectively request updates only when necessary, rather than forcing all AMFs to respond in every recovery scenario. This partial action approach maintains data synchronization while reducing unnecessary communication overhead in the network
Data Source
AI summary
Methods, systems, and computer readable media for network slice selection function (NSSF) recovery. A method includes creating, at an NSSF, subscriptions for a number of access and mobility management functions (AMFs) and storing availability information for each AMF. The method includes determining, at the NSSF, that the NSSF failed to process at least one service update message from at least one of the AMFs, and in response, sending a notification request message to each of the AMFs, the notification request message requesting each AMF to update availability information for the AMF. The method includes receiving, at the NSSF, updated availability information from each of the AMFs. The method includes distributing, at the NSSF, the updated availability information to each of the AMFs.