Optical Burst Unit Overhead Position Indicators for Frame Reassembly
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Solution Overview
Problem
In Optical Burst Transport Networks (OBTN), accurately parsing and reassembling transmission frames from Optical Burst Units (OBUs) is challenging due to the lack of effective identification and positioning indicators, leading to incomplete or misinterpreted service data at the destination node.
Innovation Solution
The method involves mapping services into a target transmission frame, encapsulating it into multiple OBUs with Transmission Adapter Units (TAUs), and adding identifiers, length indicators, and position indicators to the overhead of each OBU to enable accurate parsing and reassembly at the destination node, ensuring complete service reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transmission frames are encapsulated into one OBU or one transmission frame is encapsulated into multiple OBUs, then the service data can be efficiently transported, but the difficulty of accurately parsing and reassembling the transmission frames at the destination node increases
Solution Approach 1:
The transmission frame is segmented into multiple TAUs (Transmission Adapter Units) when the frame size exceeds the OBU payload capacity. Each TAU is independently encapsulated into an OBU with unique sequence number markings. At the destination, the node uses these sequence numbers to correctly reassemble the segmented TAUs into the original transmission frame, solving the parsing complexity issue while maintaining transport efficiency.
Solution Approach 2:
The source node performs preliminary actions by adding sequence number indicators to each TAU during the encapsulation process. This preliminary marking of position information enables the destination node to easily parse and reassemble the transmission frame without complex processing, reducing the parsing complexity while maintaining the ability to efficiently transport service data.
2Ease of manufacture
If transmission frames are encapsulated into OBUs without position indicators, then the encapsulation process is simpler, but the destination node cannot determine the receiving progress or completeness of service data
Solution Approach 1:
The patent applies local quality by adding position indicator fields specifically to the overhead portion of each TAU, rather than modifying the entire frame structure. This localized addition of sequence number information maintains the overall simplicity of the encapsulation process while providing the necessary receiving progress information at the destination node for completeness verification.
3Measurement precision
If position indicators are added to each TAU overhead, then the destination node can accurately track receiving progress, but the overhead size of each OBU increases
Solution Approach 1:
The patent uses parameter changes by implementing a compact sequence number field in the TAU overhead that efficiently encodes position information. This optimized parameter representation provides accurate receiving progress tracking while minimizing the increase in overhead size, balancing measurement precision with resource efficiency.
Data Source
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AI summary
Provided are service sending, receiving methods and devices. The service sending method includes that: one or more services are sequentially mapped into a target transmission frame; the target transmission frame is encapsulated into Optical Burst Units (OBUs), which carry one or more Transmission Adapter Units (TAUs), according to a sequence of mapping, wherein the one or more TAUs carried in the N OBUs are able to be formed into the target transmission frame, and each TAU carries a data fragment of the one or more services; N is a positive integer; an Identifier (ID) for indicating an identity of the target transmission frame is added into an overhead of each TAU; a length indicator for indicating the length of payload, occupied by the TAU, in an OBU is added into the overhead of each TAU; a position identifier for indicating a position of the TAU in the target transmission frame is added into the overhead of each TAU; and the N OBUs are sent to a destination node one by one according to a sequence of encapsulating. According to the solution, service transmission can be performed in an Optical Burst Transport Network (OBTN).