SGW Node Selection for 4G-5G Interworking
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Solution Overview
Problem
In interworking 4G and 5G networks, the current SGW selection process is inefficient as it does not consider subsequent network connections, leading to suboptimal user plane node selection and potential billing issues due to improper location of SGW nodes.
Innovation Solution
Implementing SGW selection logic on the MME to intelligently select co-located SGW-C, PGW-C, and SMF nodes for initial network connections, ensuring that these nodes are also used for subsequent network connections, thereby optimizing user plane selection and reducing infrastructure costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the current SGW selection process is used, then the network connection can be established, but the SGW node selection is suboptimal and does not consider subsequent network connections
Solution Approach 1:
The MME performs preliminary actions by selecting the SGW-C node before the actual network connection is established. The MME receives the first connectivity request, selects an appropriate SGW-C node based on network conditions and requirements, and prepares the control plane serving gateway in advance. This preliminary selection ensures that the same SGW-C node will be used for subsequent network connections, avoiding repeated selection processes and ensuring optimal node usage.
2Loss of time
If SGW nodes are selected without considering subsequent connections, then initial connection can be established quickly, but infrastructure costs increase due to split sessions
Solution Approach 1:
The system implements feedback mechanisms where the MME tracks and monitors network connection patterns and SGW node performance. Based on this feedback information, the MME makes informed decisions about SGW-C node selection for subsequent connections. The feedback loop ensures that the same optimal SGW-C node is consistently selected, preventing split sessions and reducing infrastructure costs while maintaining efficient connection establishment.
3Reliability
If co-located SGW-C and PGW-C nodes are used, then billing accuracy improves, but the selection process becomes more complex
Solution Approach 1:
The invention merges the selection of SGW-C and PGW-C nodes into a unified process. The MME selects co-located SGW-C and PGW-C node pairs, ensuring that both control plane gateway nodes are from the same physical or logical location. This merging of selection criteria ensures billing accuracy by maintaining proper location information while simplifying the overall selection process through integrated decision-making at the MME level.
Data Source
AI summary
In one example, a first connectivity request for a first network connection between a user equipment and a first network is obtained. A control plane serving gateway node for the first network connection is selected. The control plane serving gateway node is co-located with a control plane packet data network gateway node configured to support a second network connection between the user equipment and a second network that is different from the first network. A second connectivity request for the second network connection is obtained. The second network connection is established with the control plane serving gateway node and the control plane packet data network gateway node.