Session Management Gateway Selection for Downlink Data Routing
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Solution Overview
Problem
In next-generation mobile communication networks, idle network slices do not maintain a transmission path in the user plane, leading to downlink data being cached at incorrect gateways, causing improper data transmission to User Equipment (UE).
Innovation Solution
A data transmission method that involves obtaining the state information of the UE, selecting the correct gateway function entity for transmission based on the UE's state, determining the appropriate data transmission path, and performing the transmission accordingly, ensuring that downlink data is routed through the correct gateway and base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If idle network slices do not maintain a transmission path in the user plane, then network resource utilization rate is improved, but downlink data cannot be forwarded to the correct gateway connected to the base station currently providing service to the UE
Solution Approach 1:
The session management function entity proactively obtains UE state information and determines the correct gateway function entity before downlink data arrives. This preliminary action ensures that when data needs to be transmitted, the correct transmission path is already identified, resolving the contradiction between not maintaining persistent paths and ensuring accurate data delivery.
Solution Approach 2:
The session management function entity acts as an intermediary that bridges the gap between idle network slices and active data transmission. It receives downlink data notifications, queries UE state information, determines the appropriate gateway function entity, and establishes transmission paths as needed, thereby enabling accurate data forwarding without requiring permanent path maintenance.
2Reliability
If the network maintains context information and transmission paths for all network slices, then downlink data can be forwarded correctly, but network resource utilization rate decreases
Solution Approach 1:
The system dynamically maintains transmission paths only when necessary. The session management function entity queries UE state information in real-time and establishes transmission paths only for idle network slices that require data delivery, rather than maintaining paths for all slices continuously. This dynamic approach balances reliability with resource efficiency.
Solution Approach 2:
The system changes the state of transmission paths from persistent to on-demand. By querying UE state information and determining gateway function entities only when downlink data arrives at idle network slices, the system transforms the parameter of path maintenance from a static continuous state to a dynamic event-driven state, improving resource utilization while maintaining accuracy.
3Reliability
If the network queries UE state information and determines correct gateway function entities for idle network slices, then downlink data transmission accuracy is improved, but system complexity increases
Solution Approach 1:
The session management function entity performs multiple functions: it manages active network slices, handles downlink data notifications, queries UE state information, determines correct gateway function entities, and establishes transmission paths. By consolidating these diverse functions into a single multi-functional entity, the system improves transmission accuracy without proportionally increasing overall system complexity.
Data Source
AI summary
A data transmission method, a data transmission apparatus, and a session management device are provided. The data transmission method includes obtaining state information of a UE to which downlink data is destined; selecting, for the UE, a first gateway function entity for transmission of the current downlink data according to the state information of the UE; determining a first data transmission path between the first gateway function entity and a second gateway function entity; and performing the transmission of the downlink data according to the first data transmission path.