Retransmission Coding for Error-Prone Modulation Patterns
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In high-speed data connectivity systems, particularly in Gfast compliant DSL modems, retransmissions of data units often result in signal spikes and errors due to repeated modulation patterns, which can lead to data corruption and failure, as the current techniques fail to adequately alter the data units between retransmissions, causing similar errors as the original transmission.
Innovation Solution
The system alters various fields within the data transmission units, such as the timestamp field and auxiliary bits, between retransmissions to introduce variations that prevent signal spikes and errors, including incrementing the timestamp field and changing auxiliary bits, thereby increasing the difference between initial and retransmitted data units to mitigate error-causing modulation patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data units are retransmitted using the same modulation patterns, then retransmission efficiency is maintained, but signal spikes and errors occur due to repeated patterns
Solution Approach 1:
The patent applies parameter changes by modifying specific fields within the data unit structure during retransmission. The timestamp field is incremented, auxiliary bits are altered, and other optional fields are changed to create variations in the modulated signal while preserving the core data payload. This ensures that retransmissions use different modulation patterns, preventing signal spikes and errors caused by repetition, thereby maintaining both retransmission efficiency and data reliability
2Reliability
If data units are altered between retransmissions, then error-prone modulation patterns are prevented, but data unit complexity increases
Solution Approach 1:
The patent segments the data unit into distinct functional fields: header fields (including timestamp and sequence identifiers), payload data, and auxiliary/error correction fields. By applying alterations only to specific segments (header and auxiliary fields) rather than the entire data unit, the patent reduces the complexity overhead while still achieving the goal of preventing repeated modulation patterns. This selective segmentation maintains reliability without unnecessarily increasing overall complexity
Data Source
AI summary
A source node may send a first data unit to a destination node. To send the first data unit, the source node may transmit a modulation pattern over a transmission medium. In some cases, particular data units may correspond to modulation patterns with features that cause errors in transmission. The source node may receive an indication of an error from the destination node. To avoid repeated errors the retransmission, coding circuitry at the source node may alter data within the first data unit to generate a retransmission data unit. The alteration may result in the retransmission data unit corresponding to a modulation pattern different from that of the first data unit. The new modulation pattern may lack the error causing features and reduce the chance of repeated errors.