Deterministic Networking Mapping Updates for Abnormal Link Delays
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Solution Overview
Problem
In deterministic networking, downstream nodes fail to detect abnormal delays on links due to switching or delay changes, leading to unstable data transmission.
Innovation Solution
A method for updating period-based mapping relationships by a downstream node that sequentially receives packets from an upstream node, determining time differences, and updating the mapping when differences fall outside a preset range to adapt to link abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a downstream node uses a fixed period-based mapping relationship for packet forwarding, then forwarding simplicity is maintained, but the system cannot adapt to link abnormalities such as switching or delay changes
Solution Approach 1:
The downstream node monitors the actual time difference between receiving consecutive packets and compares it with the expected time difference derived from the period-based mapping relationship. When an abnormality is detected (time difference exceeds a threshold), the node requests updated mapping relationship information from the upstream node, creating a feedback loop that enables adaptive response to link changes while maintaining normal operation under fixed conditions
Solution Approach 2:
The mapping relationship transitions from a static, pre-configured structure to a dynamic one that can be updated in response to detected abnormalities. The system maintains the simplicity of fixed-period forwarding during normal operation but introduces dynamic updates only when necessary, allowing the mapping relationship to adapt its behavior based on network conditions
2Reliability
If the downstream node detects link abnormalities by monitoring packet arrival times, then transmission stability is improved, but detection complexity increases
Solution Approach 1:
The downstream node performs self-diagnosis by autonomously monitoring its own packet reception times and comparing them against expected values. The node can independently detect abnormalities and initiate requests for updated mapping information without requiring external monitoring systems, enabling reliability improvement through simple local measurements
3Reliability
If the downstream node updates the period-based mapping relationship in response to detected abnormalities, then packet forwarding stability is maintained, but processing overhead increases
Solution Approach 1:
The system proactively requests updated mapping relationship information from the upstream node as soon as an abnormality is detected, rather than waiting for forwarding errors to occur. This preliminary action prevents further transmission instability and allows the downstream node to quickly adapt to new link conditions, minimizing the time loss associated with updates
Data Source
AI summary
This application provides a mapping relationship updating method, applied to deterministic networking. The method includes: A first device sequentially obtains a first packet and a second packet that are sent by a second device; the first device determines a first time difference between a time at which the first packet is received and a time at which the second packet is received; and if the first device determines that the first time difference is not within a preset range, the first device updates a period-based mapping relationship.