Distributed Delay Offset Matching for Lossless Traffic Forwarding
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Solution Overview
Problem
In network technology, existing lossless traffic forwarding methods face challenges in maintaining packet order and efficiency when forwarding paths have different delay times, leading to potential disconnections and mis-ordering issues during failures or path restoration, especially in time-deterministic networks where low-cost sensors and actuators lack sufficient processing capability to correct order errors.
Innovation Solution
The implementation of distributed delay deviation matching technology using buffer resources on network nodes to calculate and control delay offsets between forwarding paths, ensuring packets are delayed and reordered correctly, with software-defined networking (SDN) for centralized management and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple forwarding paths are used for lossless traffic forwarding, then reliability is improved, but delay time synchronization deteriorates due to different path delays
Solution Approach 1:
The patent applies preliminary action by calculating the delay offset between primary and backup forwarding paths in advance, before any failure occurs. The controller determines the delay characteristics of each path and pre-configures the delay offset value, so that when a failure happens, the backup path is already prepared with the correct delay compensation setting, enabling immediate seamless switching without waiting for delay measurement during failure recovery
Solution Approach 2:
The patent changes the delay parameter of packets forwarded through the backup path by applying a delay offset. The controller adjusts the delay offset parameter based on the calculated delay difference between primary and backup paths, modifying the time parameter of packet transmission to synchronize arrival times at the receiving node, thereby resolving the delay synchronization issue while maintaining reliability through path diversity
2Stability of the object's composition
If delay offset matching is implemented, then packet order is improved, but device complexity increases due to buffer resource management
Solution Approach 1:
The patent extracts the delay compensation function from the packet forwarding path itself and places it in the buffer resources of network nodes along the path. Instead of requiring complex end-to-end delay management, the delay offset is applied at intermediate buffer nodes, simplifying the overall system architecture while maintaining packet order through distributed delay matching
3Stability of the object's composition
If buffer resources are used for delay matching, then packet forwarding stability is improved, but network resource consumption increases
Solution Approach 1:
The patent applies partial action by using buffer resources only when necessary for delay matching, rather than continuously occupying buffer space. The delay offset is applied selectively to packets that require synchronization, and the buffer resources are released once the delay compensation is complete, thereby maintaining packet forwarding stability while minimizing unnecessary network resource consumption
Data Source
AI summary
Disclosed are methods lossless traffic forwarding using distributed delay offset matching. The lossless traffic forwarding method includes calculating a delay offset between a first forwarding path between a transmitting node and a receiving node and a second forwarding path between the transmitting node and the receiving node, and controlling a buffer resource by an extent of the delay offset to delay packets to be forwarded on the first forwarding path.