AMF PDU Session Management via NS-AoS Verification
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Solution Overview
Problem
Current 5G mobile communication systems face challenges in optimally managing PDU sessions due to the lack of consideration for partially allowed Network Slice Selection Assistance Information (NSSAI) and Network Slice Area of Service (NS-AoS) during slice selection, leading to non-optimal PDU session establishment and potential service unavailability.
Innovation Solution
The proposed method involves the Access and Mobility Management Function (AMF) verifying if an S-NSSAI in the allowed NSSAI is inside the NS-AoS and selecting it as the S-NSSAI for PDU session establishment. Additionally, if the UE has a partially allowed NSSAI, the AMF considers entries from both the allowed and partially allowed NSSAIs for slice selection, ensuring the selected slice is supported in the UE's current location and available based on validity time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the AMF selects S-NSSAI without verifying NS-AoS, then the PDU session establishment process is simple and fast, but the service reliability deteriorates due to potential service unavailability
Solution Approach 1:
The network pre-provides NS-AoS information to the UE before PDU session establishment. The AMF stores and manages NS-AoS data for different network slices and locations, so that when slice selection is needed, the verification can be performed efficiently using pre-prepared information rather than real-time queries.
Solution Approach 2:
The system implements feedback mechanisms where the AMF verifies whether the selected S-NSSAI is within the NS-AoS based on UE location and slice availability information. The AMF can update NS-AoS information based on network conditions and provide feedback to the UE about available slices, creating a closed-loop system that improves reliability.
2Adaptability or versatility
If the AMF considers only allowed NSSAI for slice selection, then the selection process is straightforward, but the adaptability deteriorates as partially allowed NSSAI entries are ignored
Solution Approach 1:
The system dynamically adjusts slice selection by considering both allowed NSSAI and partially allowed NSSAI based on current network conditions and UE location. The AMF evaluates multiple NSSAI categories and selects from them according to NS-AoS verification, making the slice selection process adaptive rather than static.
Solution Approach 2:
The system changes the selection parameters by incorporating NS-AoS verification as an additional criterion beyond just checking allowed NSSAI. The AMF uses location information, slice availability status, and NSSAI category (allowed vs partially allowed) as dynamic parameters to determine the optimal S-NSSAI selection.
3Reliability
If the AMF performs NS-AoS verification for all S-NSSAI, then service availability is maximized, but the processing time and complexity increase
Solution Approach 1:
NS-AoS information and slice availability status are determined and stored in advance by the network before PDU session establishment requests arrive. The AMF has pre-configured knowledge about which slices are available in which areas, eliminating the need for real-time verification queries during session establishment.
Solution Approach 2:
The verification process focuses on local conditions by using UE-specific location information to check against location-specific NS-AoS data. Rather than performing universal verification for all possible slices, the system efficiently checks only the relevant slices for the UE's current location and service requirements.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by an access and mobility management function (AMF) in wireless communication system, the method comprising: receiving, from a user equipment (UE), an uplink non-access stratum (UL NAS) transport message including a payload container type information element (IE) set to N1 SM information and a request type IE indicating initial request; and identifying that a single network slice selection assistance information (S-NSSAI) IE is not included in the UL NAS transport message.