DetNet Flow Timing Compensation Across Unsynchronized Domains
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Solution Overview
Problem
The transmission of DetNet flows across different domains with unsynchronized clocks and varying scheduling cycles leads to difficulties in establishing fixed mapping relationships, affecting the reliability and timing of the transmission process.
Innovation Solution
A cross-domain transmission method that compensates for the actual transmission latency of DetNet-flow data packets by determining a target global reference latency and adjusting the scheduling cycle at the egress node, without requiring clock synchronization across domains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If strict scheduling cycle mapping is performed across different DetNet domains, then transmission reliability is improved, but clock synchronization complexity increases
Solution Approach 1:
The patent introduces a timing synchronization mechanism that acts as an intermediary between different DetNet domains with unsynchronized clocks. The egress node measures actual transmission latencies and performs time compensation on packet timestamps, effectively mediating the timing differences between domains without requiring direct clock synchronization. This allows strict scheduling to be maintained at the application level while avoiding the complexity of synchronizing clocks across all domains.
2Reliability
If fixed mapping relationships are established between scheduling cycles of different domains, then deterministic transmission is improved, but adaptability to varying latency conditions deteriorates
Solution Approach 1:
The patent implements a dynamic time compensation mechanism where the egress node continuously measures actual transmission latencies for packets passing through intermediate domains and adjusts the scheduling timestamps accordingly. Instead of using fixed mapping relationships, the system dynamically calculates compensation values based on measured latency variations, allowing deterministic transmission to be maintained while adapting to changing network conditions.
3Measurement precision
If time compensation is performed for each packet based on actual transmission latency, then transmission precision is improved, but processing complexity increases
Solution Approach 1:
The patent performs time compensation at the egress node after packets have traversed the network, rather than requiring pre-calculation at the ingress node. The egress node measures the actual transmission latency that packets experienced and applies compensation to the timestamps. This preliminary measurement and subsequent compensation approach achieves high timing precision while concentrating the processing complexity at a single node rather than distributing it across all network nodes.
Data Source
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AI summary
An embodiment provides a cross-domain transmission method and apparatus of a DetNet flow and an electronic device. In the embodiment, an egress node in a last determinist network domain that a DetNet-flow data packet passes through can, based on an actual transmission latency Δt'n of the received DetNet-flow data packet in the last DetNet domain and actual transmission latencies of the DetNet-flow data packet when passing through other DetNet domains, perform time compensation for the DetNet-flow data packet so as to achieve reliable transmission of the DetNet-flow data packet. Furthermore, in an embodiment of the present disclosure, it is not required to synchronize the clocks of multiple DetNet domains that the DetNet-flow data packet passes through, which facilitates construction of a large-scale deterministic network and greatly reduces deployment difficulty.