SGW-U Context Recovery via Trigger Message for Service Continuity
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Solution Overview
Problem
In the current distributed gateway (DGW) network architecture, the serving gateway for user plane (SGW-U) sometimes loses context information, leading to user data service interruptions due to missing tunnel endpoint identifiers (TEID), which affects user experience.
Innovation Solution
The SGW-U sends a trigger message to the serving gateway for control plane (SGW-C) when it lacks context information, prompting SGW-C to retrieve and send the necessary context information, ensuring uninterrupted data packet transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the SGW-U stores context information locally for fast data packet forwarding, then data transmission speed is improved, but the risk of information loss increases leading to service interruptions
Solution Approach 1:
The SGW-C proactively establishes bearer context information and stores it in advance before data transmission occurs. This preliminary action ensures that when the SGW-U needs to forward data packets, the context information is already available at the control plane, preventing service interruptions due to information loss while maintaining fast local forwarding at the user plane.
2Productivity
If the SGW-U independently processes data packets using local context information, then processing efficiency is improved, but the system's adaptability to context information loss decreases
Solution Approach 1:
The system implements a feedback mechanism where the SGW-U monitors the availability of context information during data packet processing. When context information is lost or becomes invalid, the SGW-U can detect this condition and trigger a recovery procedure by requesting updated context information from the SGW-C, thereby adapting to the loss condition while maintaining high processing efficiency for normal operations.
3Measurement precision
If the SGW-U requests context information from SGW-C frequently to ensure accuracy, then information accuracy is improved, but signaling overhead increases
Solution Approach 1:
Instead of frequently requesting context information from the SGW-C, the system applies partial action by only initiating context information requests when absolutely necessary - specifically when the SGW-U detects context information loss or invalidation. This approach maintains information accuracy by obtaining context information when needed while avoiding excessive signaling overhead by not performing unnecessary requests during normal operations.
Data Source
AI summary
Embodiments of the present disclosure provide a data packet sending method and apparatus, and relate to communications field. The method includes: receiving, by an SGW-U, a data packet, and matching context information of a corresponding bearer according to a tunnel endpoint identifier (TEID) carried in the data packet; sending a trigger message to a serving gateway for control plane SGW-C if the SGW-U determines, through matching, that the SGW-U does not include the context information of the bearer, where the trigger message carries the TEID, and the trigger message is used by the SGW-C to obtain the context information of the bearer according to the TEID; receiving a reestablish bearer context message sent by the SGW-C, where the reestablish bearer context message carries the context information of the bearer; and sending the data packet according to the context information of the bearer.