T-AMF Handover Optimization via S-NSSAI Validation
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Solution Overview
Problem
The existing mobile communication systems face challenges in efficiently managing handover procedures due to unnecessary signaling and resource allocation when user equipment (UE) mobility occurs, particularly due to unsupported Single-Network Slice Selection Assistance Information (S-NSSAI) during handover, leading to inefficient handover processes and resource wastage.
Innovation Solution
A method is proposed where the Target-Access and Mobility Management Function (T-AMF) receives a create UE context request message with PDU session IDs and S-NSSAI, determines availability, and only transmits a PDU session update request to the Session Management Function (SMF) for available S-NSSAI, generating a list of non-accepted sessions and releasing resources for unsupported S-NSSAI, thereby optimizing handover processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the T-AMF transmits PDU session update requests for all PDU sessions during handover, then the handover procedure is comprehensive, but unnecessary signaling and resource allocation occur for unsupported S-NSSAI
Solution Approach 1:
The T-AMF performs preliminary determination of S-NSSAI availability before transmitting PDU session update requests. By checking whether the target AMF supports each S-NSSAI in advance, the system prevents unnecessary signaling for unsupported sessions, thereby reducing signaling overhead while maintaining handover completeness for supported sessions.
2Reliability
If the T-AMF allocates resources for all PDU sessions during handover, then resource allocation is comprehensive, but resource wastage occurs for unsupported S-NSSAI
Solution Approach 1:
The T-AMF performs preliminary determination of S-NSSAI availability before allocating resources. By checking support status in advance, the system allocates resources only for PDU sessions with supported S-NSSAI, preventing resource wastage while ensuring comprehensive resource allocation for all supported sessions.
3Reliability
If the handover procedure processes all PDU sessions, then the procedure is thorough, but the handover efficiency decreases due to unnecessary processing
Solution Approach 1:
The handover procedure is segmented into two distinct phases: first, determination of S-NSSAI availability for each PDU session; second, processing (transmission of update requests and resource allocation) only for sessions with supported S-NSSAI. This segmentation filters out unnecessary processing for unsupported sessions, thereby improving handover efficiency while maintaining thoroughness for supported sessions.
Solution Approach 2:
The T-AMF performs preliminary determination of S-NSSAI availability before initiating the main handover processing. This preliminary filtering action identifies which PDU sessions require further processing, eliminating unnecessary processing steps for unsupported sessions and thereby improving overall handover efficiency.
Data Source
AI summary
According to one aspect of the present invention, a method for supporting a user equipment (UE) handover of a target (T)-access and mobility management function (AMF) in a wireless communication system may comprise the steps of: receiving a UE context creation request message from a source (S)-AMF, wherein the UE context creation request message includes packet data unit (PDU) session identifiers (ID) as a handover target and single (S)-network slice selection assistance information (NSSAI) corresponding to each PDU session ID; determining whether the corresponding S-NSSAI is valid in the T-AMF; and sending, to a session management function (SMF), a PDU session update session management (SM) context request message only for a PDU session ID that corresponds to the S-NSSAI determined to be valid according to the determination result, out of the PDU session IDs.