ATM Frame Structure with Adjacent Overhead Cells
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Solution Overview
Problem
Existing point-to-multipoint telecommunication systems are inflexible due to a fixed structure of one overhead cell followed by a limited number of data cells, leading to segmentation of data, increased overhead, and delay variations, which restricts the capacity and efficiency of data transmission.
Innovation Solution
The system introduces a new signal frame structure with two or more overhead cells located next to each other, followed by a larger number of data cells, allowing for flexible configuration of overhead and data cell numbers based on data requirements, and includes a generator for generating these overhead cells and a detector for locating them in downstream units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed structure of one overhead cell followed by a limited number of data cells is used, then the system structure is simple and standardized, but the data transmission capacity is limited and data segmentation occurs
Solution Approach 1:
The patent applies dynamics by making the frame structure flexible rather than fixed. The upstream unit can dynamically adjust the number of overhead cells (at least two) and the number of following data cells based on system requirements. This dynamic configuration allows the frame structure to adapt to different data transmission needs, increasing capacity without requiring multiple standardized structure types.
Solution Approach 2:
The patent changes the parameter of frame structure configuration from fixed to variable. By allowing the number of overhead cells and data cells to be arbitrarily chosen (with at least two overhead cells), the system can optimize transmission capacity for different scenarios. This parameter change resolves the contradiction by enabling high capacity when needed while maintaining reasonable structure complexity.
2Quantity of substance
If one overhead cell is used to supply system information, then the overhead is minimal, but the system information capacity is insufficient
Solution Approach 1:
The patent segments system information across multiple overhead cells (at least two) that are located next to each other. This segmentation allows distribution of different types of system information across the multiple overhead cells, increasing the total system information capacity while maintaining organized structure through the segmentation approach.
Solution Approach 2:
The patent merges multiple overhead cells (at least two) located next to each other to form a combined information supply structure. This merging increases the total system information capacity available to downstream units while presenting a unified overhead structure to the data transmission process, avoiding excessive complexity.
3Productivity
If data cells are frequently interrupted by overhead cells, then the overhead can be regularly inserted for maintenance, but the data transmission efficiency decreases due to segmentation
Solution Approach 1:
The patent applies preliminary action by placing at least two overhead cells at the beginning of the frame structure, next to each other, before the data cells. This preliminary placement of multiple overhead cells allows all necessary system information and maintenance functions to be handled upfront, enabling the subsequent large block of data cells to transmit without interruption, thereby improving efficiency while maintaining reliability.
Solution Approach 2:
The patent enables continuity of useful action by creating a large uninterrupted block of data cells following the initial overhead cells. This continuous data transmission block eliminates segmentation interruptions during data transfer, improving transmission efficiency while the initial overhead cells ensure system maintenance capability is maintained.
Data Source
AI summary
A point-to-multipoint telecommunication system can be made more flexible by providing upstream units with generators and locators for generating at least two subsequent overhead cells located next to each other and neighbouring a larger number of data cells for supplying system information. Downstream units are provided with detectors for detecting the subsequent overhead cells. This new signal flame structure allows a larger number of data cells to be exchanged without being interrupted by an overhead cell. Each cell consists of at least 53 bytes in accordance with the Asynchronous Transfer Mode or ATM standard. The at least two overhead cells comprise two overhead cells for supporting 54 data cells, or comprise three overhead cells for supporting 103 data cells. The point-to-multipoint telecommunication systems comprise passive optical networks, with upstream units corresponding to line terminators, and with downstream units corresponding to network terminators.