OSUflex Signal Frame Processing for Sink Delay Compensation
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Solution Overview
Problem
In optical transport networks, the mapping of small-granularity services to different flexible tributary unit frames causes delay variation that accumulates at sink nodes, leading to significant transmission delays.
Innovation Solution
Implementing a signal frame processing method that includes a node quantity field to determine the number of nodes traversed, allowing for delay compensation at the sink node, and optionally including a keep alive field to maintain service continuity and bandwidth reservation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the OSUflex frame is mapped to the OPUk frame at each node, then the service can be transmitted through multiple nodes, but delay variation accumulates at the sink node
Solution Approach 1:
The source node preliminarily calculates and inserts the total number of nodes (including itself and the sink node) into the node quantity field of the OSUflex frame before transmission. This preliminary action enables the sink node to perform accurate delay compensation without needing to count nodes during transmission, resolving the contradiction between multi-node transmission capability and accumulated delay variation.
2Loss of time
If the node quantity field is added to the OSUflex frame, then delay compensation can be performed, but the frame structure becomes more complex
Solution Approach 1:
The node quantity field is integrated into the existing overhead subframe structure of the OSUflex frame, utilizing available space for multi-purpose functionality. This approach enables delay compensation capability while maintaining compatibility with existing frame processing mechanisms, thereby avoiding significant increase in frame structure complexity.
3Loss of time
If delay compensation is performed at the sink node, then delay variation is eliminated, but the processing complexity at the sink node increases
Solution Approach 1:
The sink node utilizes the node quantity information already present in the received frame to perform self-service delay compensation. By using the pre-provided node count from the frame header, the sink node can automatically calculate and implement delay compensation without requiring complex external control or additional signaling, thus minimizing the increase in processing complexity.
Data Source
AI summary
Embodiments of this application provide a signal frame processing method and a related device. A sink node performs delay compensation on a received service, so that delay variation generated in a transmission process of the service can be effectively eliminated. The method in embodiments of this application includes the following steps. First, the sink node receives a signal frame. A payload area of the signal frame is used to bear a target service, and an overhead area of the signal frame includes a node quantity field. Then, the sink node determines, based on the node quantity field, a quantity of nodes through which the target service passes during transmission. Further, the sink node performs delay compensation on the target service based on the quantity of nodes.