Serving Gateway PDN Connection Release After MME Restart
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Solution Overview
Problem
In the EPS mobile communication system, the setting of the PDN connection between the S-GW and P-GW is maintained even after a new PDN connection is established, leading to resource wastage when the MME is restarted due to failure.
Innovation Solution
A method where the S-GW transmits a downlink data notification signal with identification information to the MME, which then initiates paging for the UE, allowing re-attach processing and subsequent release of the PDN connection between the S-GW and P-GW upon successful re-attach confirmation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PDN connection is maintained between the S-GW and P-GW after MME restart, then data transmission can continue, but resource wastage occurs
Solution Approach 1:
The S-GW performs preliminary actions by transmitting the Downlink Data Notification signal to the MME before the MME restarts, ensuring that the MME is notified of the PDN connection state. This preliminary notification allows the system to properly manage connection states during and after the MME restart, preventing resource wastage while maintaining data transmission capability.
Solution Approach 2:
The system implements feedback mechanisms where the S-GW notifies the MME about the PDN connection state through Downlink Data Notification signals. This feedback loop ensures that the MME is aware of the connection status and can appropriately manage resources during restart, balancing data transmission continuity with resource efficiency.
2Loss of energy
If the PDN connection is released between the S-GW and P-GW after MME restart, then resource wastage is prevented, but data transmission may be interrupted
Solution Approach 1:
The system dynamically manages the PDN connection state based on MME restart conditions. The S-GW can transmit Downlink Data Notification signals to notify the MME of connection states, allowing the system to adaptively maintain or release connections as needed. This dynamic approach prevents resource wastage while ensuring data transmission continuity when necessary.
Solution Approach 2:
The S-GW acts as an intermediary between the P-GW and the MME, transmitting Downlink Data Notification signals to convey connection state information. This intermediary role allows the system to manage PDN connections during MME restart by coordinating between different network elements, preventing resource wastage while maintaining transmission reliability.
3Reliability
If the MME is restarted due to failure, then system reliability is improved, but existing connections may be disrupted
Solution Approach 1:
The S-GW transmits Downlink Data Notification signals to the MME before the MME restarts, performing preliminary actions to notify the connection state. This ensures that when the MME restarts, it already has the necessary information about active PDN connections, minimizing disruption time and maintaining system reliability.
Solution Approach 2:
The system uses feedback through Downlink Data Notification signals to keep the MME informed of PDN connection states during the restart process. This feedback mechanism allows the MME to quickly recover and re-establish connections after restart, reducing the time loss while improving overall system reliability.
Data Source
AI summary
A mobile communication method according to the present invention includes the steps of: starting, by a UE, re-attach processing for MME#2, upon receiving “Paging”; transmitting, by MME#1, “DDN Ack” including “EPS Bearer ID#1” included in “DDN” and “Cause=Re-Attach Success” (information indicating that re-attach processing is successful), to S-GW#1 specified by S-GW address #1 included in the “DDN”; and releasing, by S-GW#1, a PDN connection #1 between S-GW#1 and P-GW#1, upon receiving the “DDN Ack”, the PDN connection #1 corresponding to the “EPS Bearer ID#1” included in the “DDN Ack”.