5G Session Management Function Terminal Event Subscription
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Solution Overview
Problem
In the 5G mobile communications system, configuring and activating terminal events and reporting events in the network is not effectively resolved, particularly in scenarios requiring high-latency service communication.
Innovation Solution
A communications method and apparatus that subscribe to a terminal event in a 5G architecture by determining a session management function entity based on data network name, slice information, or application function service identifier, and sending messages to subscribe to and monitor terminal events, including service description information, event correlation identifiers, and event type information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If session management and mobility management are controlled by a single MME in 4G architecture, then control is simplified and centralized, but the architecture cannot support the separated management functions required in 5G systems
Solution Approach 1:
The patent segments the control functions by introducing separate SMF and AMF entities in the 5G core network. The SMF handles session management while the AMF handles mobility management, allowing independent optimization of each function and enabling the architecture to support diverse 5G service requirements with differentiated management needs.
Solution Approach 2:
The patent introduces the UPF as an intermediary between the data network and the core network control functions. The UPF handles user plane traffic forwarding and packet routing, mediating between the session management requirements of the SMF and the actual data transmission, thereby decoupling control plane and user plane functions.
2Ease of operation
If the MME directly activates monitoring events for terminal availability, then event activation is straightforward in 4G, but the mechanism does not account for service-specific event configuration in 5G architecture
Solution Approach 1:
The patent implements preliminary action by having the SMF pre-configure service-specific event subscription information before actual event monitoring is needed. The SMF subscribes to terminal availability events in advance through the AMF, maintaining event subscription context that can be quickly activated when services require terminal availability monitoring, thus combining simplicity with service-specific adaptability.
3Device complexity
If terminal event monitoring is implemented without service description information, then event subscription is simpler, but specific services cannot be accurately identified and monitored
Solution Approach 1:
The patent applies local quality by incorporating service description information (such as DNN, slice information, and application function service identifiers) into event subscription messages at the specific service level. This allows the SMF to subscribe to terminal events with precise service context, enabling accurate identification and monitoring of service-specific terminal availability while maintaining a standardized subscription mechanism.
Data Source
AI summary
A communications method includes determining a session management function entity based on at least one of a data network name, slice information, and an application function service identifier, and sending a first message to the session management function entity, where the first message is used to subscribe to a terminal event, the first message includes service description information, and the service description information is used to indicate a service corresponding to the terminal event.