SMF Reselection Using PDU Session Management Sensing
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Solution Overview
Problem
In 5G communications systems, the existing method for selecting a session management function entity (SMF) during events like UE location changes lacks sensing of PDU session management information, leading to improper SMF selection.
Innovation Solution
A method where a session management function entity senses information about session management to determine whether to reselect an SMF, sending a reselection indication or result to ensure a more appropriate SMF is chosen, using a correspondence between the SMF and session information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the AMF entity performs the SMF selection operation, then the SMF selection can be performed, but the selected SMF may be improper because the AMF does not sense information about PDU session management
Solution Approach 1:
The SMF entity performs self-service by autonomously determining whether to reselect based on its own sensing of PDU session management information, eliminating the need for the AMF to perform complex selection operations and ensuring accurate SMF selection
Solution Approach 2:
The SMF entity uses feedback from sensing PDU session management information to autonomously determine reselection, creating a closed-loop system that improves selection accuracy while reducing AMF complexity
2Reliability
If the SMF entity autonomously determines reselection based on sensing PDU session management information, then the SMF selection accuracy is improved, but the SMF entity needs to perform additional sensing and determination operations
Solution Approach 1:
The SMF entity performs preliminary sensing of PDU session management information and determines reselection in advance, which improves selection accuracy while the standardized procedure maintains overall session management efficiency
Data Source
AI summary
A session management function entity selection method includes receiving a reselection indication and information about a first session of user equipment from a first session management function entity, where the reselection indication is used to instruct to reselect a session management function entity; saving a correspondence between the first session management function entity and the information about the first session according to the reselection indication; receiving a session establishment request message, where the session establishment request message carries the information about the first session; determining a second session management function entity different from the first session management function entity; and sending a session management request to the second session management function entity.