OSU Frame Data Transmission for ASON Path Setup
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Solution Overview
Problem
The existing Automatically Switched Optical Network (ASON) technology experiences low service routing speed and high overhead occupancy during network path establishment, particularly in metropolitan area/core networks, due to the time-consuming process of parsing IP packets node by node and the high overhead requirements of the RSVP-TE protocol.
Innovation Solution
A data frame sending method that includes inserting routing label stack information and service attribute information into a flexible optical service unit frame, allowing each node to quickly establish a channel and configure resources for the service, thereby reducing routing time and overhead by using only OSU frame control signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RSVP-TE protocol is used for path establishment, then service routing capability is improved, but routing time increases and overhead occupancy increases
Solution Approach 1:
The patent segments the routing information into routing label stack information and service attribute information, which are inserted into OSU frame control signaling. This segmentation allows for efficient processing and transmission of routing data without requiring complete IP packet parsing at each node, thereby reducing routing time while maintaining service routing capability.
Solution Approach 2:
The patent introduces OSU frame control signaling as an intermediary to carry routing information. Instead of using RSVP-TE protocol messages that require extensive parsing, the routing label stack information is transmitted through OSU frame control signaling, which serves as a mediator between the path computation and the service establishment process, significantly reducing processing time.
2Adaptability or versatility
If RSVP-TE protocol is used for path establishment, then service routing capability is improved, but overhead occupancy increases
Solution Approach 1:
The patent extracts the essential routing information (routing label stack information and service attribute information) from the complex RSVP-TE protocol messaging and places it into OSU frame control signaling. This extraction eliminates the need for excessive overhead occupancy while preserving the necessary service routing capability.
Solution Approach 2:
The patent uses OSU frame control signaling as a simplified copy or representation of the routing information that would otherwise be carried in RSVP-TE protocol messages. This copying approach maintains the functional equivalence of service routing while dramatically reducing the overhead required for transmission and processing.
3Loss of information
If IP packet parsing is performed node by node, then routing information can be obtained, but processing time increases and overhead increases
Solution Approach 1:
The patent performs preliminary action by pre-computing the routing path and extracting the routing label stack information before transmission. This preliminary preparation allows intermediate nodes to simply forward the OSU frames with pre-processed routing information, eliminating the need for time-consuming IP packet parsing at each node while ensuring routing information is accurately acquired.
Data Source
AI summary
Embodiments of this application provide a data frame sending method and a network device. The method includes: A first node obtains routing label stack information of a first path, where the first path is used to transmit a service, and the routing label stack information indicates each node on the first path to establish a channel of the service on the node of the first path. The first node inserts the routing label stack information and service attribute information into a payload area of a first data frame, where the service attribute information indicates each node on the first path to configure a resource for the service. The first node sends the first data frame.