DSL Retransmission Time Markers for Impulse Noise Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Modern data communication systems, such as DSL, face insufficient noise protection for high-quality services like IPTV and video, as existing impulse noise protection methods like Reed Solomon coding and interleaving are inadequate, and retransmission schemes require reliable and secure mechanisms to handle corrupt or missing data.
Innovation Solution
The implementation of time-marker information in data communication systems, which generates and stores timestamp-like information based on data bits, multicarrier symbols, or FEC codewords to facilitate accurate retransmission by linking time markers to data units, allowing for efficient retransmission and distinguishing between initial and retransmitted data units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Reed Solomon coding and interleaving are used for impulse noise protection, then data transmission reliability is improved, but protection effectiveness for high-quality services remains insufficient
Solution Approach 1:
The patent implements preliminary action by storing transmitted data units at the transmitter site before potential retransmission is needed. This allows the system to quickly retrieve and retransmit corrupted data units without waiting for the original transmission to complete, thereby improving noise protection effectiveness while maintaining service quality.
2Reliability
If retransmission schemes are implemented for high-quality services, then noise protection is improved, but system complexity increases
Solution Approach 1:
The patent applies segmentation by dividing data into discrete data units, each with its own sequence number and time marker. This allows the retransmission mechanism to handle corruption at the unit level rather than requiring complete retransmission of entire data streams, reducing the complexity burden while maintaining high reliability.
Solution Approach 2:
The patent implements feedback mechanisms where the receiver sends requests for retransmission to the transmitter based on detected corruption. This selective feedback approach allows the system to maintain high reliability by retransmitting only corrupted units while avoiding unnecessary retransmissions of intact data, thus managing system complexity effectively.
3Measurement precision
If time-marker information is added to data units for accurate retransmission, then retransmission accuracy is improved, but data overhead increases
Solution Approach 1:
The patent applies parameter changes by using sequence numbers and time markers as compact identification parameters rather than adding substantial metadata. These parameter changes enable accurate retransmission timing and identification with minimal overhead, as the sequence numbers and time markers provide sufficient information for the receiver to locate and request specific corrupted units without requiring extensive additional data.
4Reliability
If data units are stored for retransmission, then corrupt data can be corrected, but transmission delay increases
Solution Approach 1:
The patent implements preliminary action by pre-storing transmitted data units at the transmitter site before potential corruption occurs. This allows immediate retransmission of corrupted units without waiting for the original transmission to complete or requiring complex retrieval operations, thereby reducing the additional delay introduced by the retransmission mechanism while maintaining reliable data correction capability.
Data Source
AI summary
One implementation may include generating at a DSL transmitter time-marker information for a data unit, storing the time-marker information at the DSL transmitter, transmitting the data unit from the DSL transmitter to a DSL receiver, transmitting a request for retransmission from the DSL receiver to the DSL transmitter, and based on the request, retransmitting the data unit including the time-marker information from the DSL transmitter to the DSL receiver.