PON Bridge Frame Reassembly for Cascaded Networks
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Solution Overview
Problem
In cascaded PON systems using ITU-T standards like G-PON, XS-PON, and NG-PON2, fragmented user frames, such as Ethernet frames, face transmission issues over inter-PON bridges due to partial data being discarded in the transmission process.
Innovation Solution
A communication device with a first control unit that converts fragmented user frame data into a format not discarded in the transmission line by buffering and supplementing partial data, and a second control unit that reassembles the user frame for efficient transmission through the passive optical network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If user frames are fragmented to be transmitted as frames in PON systems, then transmission compatibility with ITU-T standards is improved, but complete user frames cannot be transmitted through Ethernet transmission lines
Solution Approach 1:
The invention segments the user frame into multiple partial frames (first partial frame and second partial frame) that can be transmitted separately through the PON system using standard encapsulation methods, while maintaining the ability to reconstruct the complete frame at the receiving end
Solution Approach 2:
The invention introduces an intermediary processing mechanism at the inter-PON bridge that receives fragmented frames from the PON, reassembles them into complete user frames, and then transmits them through the Ethernet transmission line, serving as a mediator between the fragmented PON format and the complete-frame Ethernet format
2Adaptability or versatility
If fragmented user frame data is transmitted through inter-PON bridges, then PON system standards are followed, but partial data is discarded in the transmission line
Solution Approach 1:
The invention performs preliminary actions by adding specific fields (such as length extension fields and identification fields) to the fragmented frames before transmission, which enable the receiving end to correctly reassemble the complete frame without discarding any partial data
Solution Approach 2:
The invention changes parameters of the frame structure by extending the length field and adding identification markers to indicate that the frame is fragmented, which allows the transmission system to treat fragmented frames differently from complete frames, preventing data loss during transmission
3Reliability
If complete user frames are transmitted through Ethernet lines in cascaded PON, then frame integrity is maintained, but transmission efficiency decreases due to fragmentation requirements
Solution Approach 1:
The invention enables the fragmented frame transmission system to serve itself by automatically reassembling the fragmented frames at the inter-PON bridge without requiring external intervention or complex processing, thereby maintaining transmission efficiency while ensuring frame integrity
Data Source
AI summary
One aspect of the present invention is a communication device including: a first control unit that converts, when data including partial data obtained by fragmenting a user frame and a user frame is received via a passive optical network, the partial data into data that is not discarded in a transmission line through which the user frame is transmitted, and transmits the data through the transmission line through which the user frame is transmitted; and a second control unit that receives the data via the transmission line through which the user frame is transmitted from the first control unit, converts the received data into a user frame that is transmittable through the passive optical network, and transmits the user frame via the passive optical network.