Adaptive Coding Modulation for Synchronous Tributaries
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Solution Overview
Problem
Synchronous connections with fixed data rates pose difficulties in being efficiently transported over variable-rate communication links, as they lack data rate flexibility and can cause inefficiencies due to mismatched data rates.
Innovation Solution
A method that accepts input data from multiple synchronous tributaries, assigns relative priorities, determines the current data rate of the communication link, and selectively omits data from tributaries to match the data rate of the composite data stream to the available link rate, using techniques like Adaptive Coding and Modulation (ACM) and Forward Error Correction (FEC) to ensure efficient transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If synchronous connections with fixed data rates are transported over variable-rate communication links, then the synchronous connections maintain their fixed rate characteristics, but transmission efficiency deteriorates due to mismatched data rates
Solution Approach 1:
The patent applies dynamics by making the data rate of synchronous connections adjustable rather than fixed. The system dynamically adapts the data rate of each synchronous connection to match the currently available data rate of the variable-rate communication link, resolving the contradiction between maintaining fixed rate characteristics and achieving transmission efficiency.
Solution Approach 2:
The patent changes the data rate parameter of synchronous connections to match the variable-rate communication link. By adjusting the data rate parameter dynamically based on link conditions, the system maintains stability of synchronous connection characteristics while improving transmission efficiency.
2Productivity
If data rate of synchronous connections is reduced to match variable-rate link capacity, then transmission efficiency improves, but data rate flexibility deteriorates
Solution Approach 1:
The system dynamically adjusts the data rate of synchronous connections based on the currently available data rate of the variable-rate link. This dynamic adaptation improves transmission efficiency while maintaining data rate flexibility through real-time adjustments rather than fixed reductions.
Solution Approach 2:
The system uses feedback from the variable-rate communication link about the currently available data rate to adjust the data rate of synchronous connections. This feedback mechanism enables the system to improve transmission efficiency while maintaining adaptability through continuous monitoring and adjustment.
3Productivity
If multiple synchronous tributaries are multiplexed to maximize data rate utilization, then transmission efficiency improves, but system complexity increases due to rate matching requirements
Solution Approach 1:
The patent uses dynamic rate adjustment of individual synchronous tributaries to match the total capacity of the variable-rate link. This dynamic approach maximizes data rate utilization while managing system complexity through automated adaptation rather than complex manual rate matching.
Solution Approach 2:
The system changes the data rate parameters of multiplexed synchronous tributaries to match the variable-rate link capacity. This parameter adjustment approach maximizes utilization while simplifying the rate matching process through dynamic adaptation.
Data Source
AI summary
A method for communication includes accepting input data from two or more data sources, one or more of which include continuous synchronous tributaries, for transmission over a wireless communication link having a variable data rate. Relative priorities are assigned to the respective data sources. A currently-available data rate of the communication link is determined. The input data accepted from the data sources is multiplexed to produce a composite data stream. The input data of at least one of the tributaries is selectively omitted from the composite data stream based on the respective relative priorities, in order to match the data rate of the composite data stream to the currently-available data rate of the communication link. The composite data stream is transmitted over the communication link.