SGW PGW Exception Handling Reduces Signaling Load
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Solution Overview
Problem
In EPS networks, the long signaling transmission link caused by PGW faults leads to low system service processing efficiency due to the need for the MME to traverse context information and reestablish PDN connections, resulting in increased signaling congestion and reduced service processing efficiency.
Innovation Solution
A service processing method where the SGW determines exceptions in the PGW, obtains deletion policies for PDN connections, and sends deletion request messages to the MME, prioritizing connection deletions based on service types, service requests, and uplink data, thereby reducing signaling transmission and simplifying the service processing procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the MME initiates PDN connection reestablishment when learning that a fault occurs in the PGW, then the PDN connection can be reestablished, but a signaling transmission procedure of a PGW fault message is added and an echo message negotiation on whether the procedure of the PGW fault message is supported needs to be performed between the MME and the SGW, resulting in a relatively long signaling transmission link and low system service processing efficiency
Solution Approach 1:
The SGW proactively initiates the PDN connection deletion process upon detecting PGW faults, rather than waiting for the MME to initiate reestablishment. This preliminary action eliminates the need for subsequent echo message negotiations and fault message transmission procedures, directly resolving the contradiction by improving processing efficiency while maintaining connection reliability
Solution Approach 2:
Instead of the conventional approach where the MME initiates PDN connection reestablishment after learning of PGW faults, this invention inverts the initiation role to the SGW. The SGW directly deletes PDN connections and notifies the MME, reversing the traditional signaling flow and eliminating unnecessary negotiation steps, thereby resolving the efficiency-reliability contradiction
2Reliability
If the MME traverses context information in an information exchange system to delete PDN connections and determine user equipments for reestablishment, then the PDN connections can be properly managed, but the signaling transmission link becomes longer and service processing efficiency decreases
Solution Approach 1:
The invention extracts the PDN connection deletion initiation function from the MME and assigns it to the SGW. The SGW directly deletes PDN connections based on PGW fault detection and notifies the MME of the deletion, eliminating the need for the MME to traverse context information and determine which connections to delete, thereby reducing processing time while maintaining management reliability
Solution Approach 2:
The SGW performs self-service by autonomously detecting PGW faults and independently initiating PDN connection deletions without requiring the MME to analyze context information. The SGW manages its own connection state and notifies the MME, eliminating time-consuming traversal operations while ensuring proper connection management
Data Source
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AI summary
The present invention discloses a service processing method and device, including: determining, by a serving gateway SGW, that an exception occurs in a packet data gateway PGW; obtaining a policy for deleting a packet data network PDN connection established between the SGW and the PGW; deleting a PDN connection between the SGW and the PGW according to the policy for deleting a PDN connection; and sending a deletion request message to a mobility management entity MME, where the deletion request message includes identity information of the deleted PDN connection and is used for notifying the MME to delete a PDN connection corresponding to the identity information. In this way, when determining that an exception occurs in the PGW, the SGW no longer needs to send the fact that an exception occurs in the PGW to the MME, thereby reducing a signaling transmission amount in a system, and simplifying a service processing procedure. Moreover, because different deletion policies are used, service processing is accelerated, service processing efficiency of the system is further improved, and user experience is improved.