5G LADN Service Request Handling via I-SMF Rejection
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Solution Overview
Problem
The integration of Local Area Data Networks (LADNs) and Intermediate Session Management Functions (I-SMFs) in 5G mobile radio communication systems poses challenges in handling service requests, particularly when a mobile terminal moves between areas served by different session management functions, leading to issues with session establishment and management.
Innovation Solution
A communication network component that receives service requests from mobile terminals and rejects them if the terminal is located in a part of the LADN that requires an intermediate session management function, determining the terminal's location and initiating service only if it is within the service area of a standard session management function, and updating the terminal's configuration to exclude unavailable LADNs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mobile terminal moves from an SMF service area to an I-SMF service area within an LADN, then the terminal can access the LADN service area, but session management becomes complex and service requests may be rejected
Solution Approach 1:
The LADN service area is segmented into multiple zones, each served by different SMF types (SMF or I-SMF). The network divides the service area based on mobility patterns and service requirements, allowing terminals to be served by appropriate SMF types in different regions, thus managing complexity while maintaining coverage
Solution Approach 2:
The AMF acts as an intermediary between the mobile terminal and the SMF/I-SMF. It determines whether the terminal is in an I-SMF service area and selectively routes service requests to the appropriate SMF type, simplifying the terminal's view while managing the complexity of having multiple SMF types in the network
2Reliability
If the network rejects service requests from terminals in I-SMF service areas, then session management control is maintained, but service availability is reduced
Solution Approach 1:
The network dynamically adjusts service request handling based on the terminal's location. Service requests are rejected only when the terminal is in an I-SMF service area and the request type is not supported, while allowing requests when the terminal is in an SMF service area or when I-SMF supports the request type. This dynamic approach maintains control while preserving service availability
Solution Approach 2:
Different service request handling policies are applied in different LADN service area zones. In SMF service areas, all request types are handled by the SMF. In I-SMF service areas, only supported request types are handled, while others are rejected. This local differentiation maintains session management control while maximizing service availability where possible
3Ease of operation
If the network supports all service request types in I-SMF service areas, then service availability is maintained, but session management complexity increases
Solution Approach 1:
The AMF serves as an intermediary that filters and routes service requests based on the terminal's location and the I-SMF's capabilities. It prevents unsupported request types from reaching the I-SMF, thereby maintaining service availability for supported requests while avoiding the complexity of implementing all request types in the I-SMF
Data Source
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AI summary
According to one embodiment, a communication network component is described comprising a receiver configured to receive a request for a communication service of a local area data network from a mobile terminal and a controller configured to reject the request if the mobile terminal is located in a part of the local area data network that requires an intermediate session management function to serve the mobile terminal.