Forwarding Node Error Indication Processing for Context Consistency
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Solution Overview
Problem
In next-generation mobile communications networks, the inconsistency between contexts of access nodes and user plane network elements due to invalid TEIDs in error indication messages disrupts normal service data packet transmission.
Innovation Solution
An error indication processing method where a forwarding node receives an error indication message with an invalid TEID, forwards it to a user plane network element, which then sends an error notification message to the control plane network element, ensuring consistency between contexts by processing the context corresponding to the TEID and IP address, thereby facilitating normal service data packet transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the access node sends an error indication message with an invalid TEID to the user plane network element, then the error indication message can be sent, but the forwarding node cannot determine the specific user plane network element to forward the message to
Solution Approach 1:
The patent introduces an intermediary mechanism where the forwarding node uses stored correspondence between TEIDs and user plane network elements to resolve the routing problem. When receiving an error indication message with an invalid TEID, the forwarding node queries its stored correspondence using the IP address and available TEID information to determine the destination user plane network element, thus mediating between the error condition and proper message delivery
Solution Approach 2:
The patent changes the routing parameters from relying solely on the invalid TEID field to using a combination of IP address and TEID correspondence lookup. By altering how the forwarding node determines destination (from direct TEID routing to correspondence-based routing), the system maintains message delivery capability even when the TEID field is invalid
2Loss of information
If the TEID field in the tunneling protocol header is set to an invalid value (all-0), then the error indication can be clearly marked, but the forwarding node cannot use it to determine the destination user plane network element
Solution Approach 1:
The stored correspondence table acts as an intermediary that bridges the gap between the invalid TEID marker and the actual destination identification. The forwarding node uses this intermediary structure to translate the error-marked message into actionable routing information, preserving both the error indication and the forwarding capability
Solution Approach 2:
The system maintains a copy of the TEID to user plane network element correspondence in the forwarding node, separate from the actual data plane TEID assignments. This copy allows the forwarding node to resolve destinations even when the original TEID information is invalid or missing
3Reliability
If the access node and user plane network element contexts are inconsistent, then errors occur in service data packet transmission, but maintaining consistency requires complex context synchronization
Solution Approach 1:
The error indication message mechanism provides feedback from the access node to the user plane network element about context inconsistencies. When the access node detects that a TEID does not correspond to a valid user plane network element, it sends an error indication message that triggers context synchronization actions, creating a feedback loop that maintains consistency
Solution Approach 2:
The system enables self-service context synchronization where the user plane network element can autonomously update its context based on error indication messages received from the access node. The control plane network element processes these errors and instructs the user plane network element to re-establish or delete contexts as needed, allowing the system to self-correct inconsistencies
Data Source
AI summary
The present disclosure provides an error indication processing method and system, and a device, and relates to the field of communications technologies, to resolve a problem that normal transmission of a service data packet is affected due to an inconsistency between contexts of an access node and a user plane network element in a next generation mobile communications network.