DSL Data Transmission Selective Retransmission for Impulse Noise
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Solution Overview
Problem
Existing DSL systems face challenges in managing impulse noise, which leads to bit errors and reduced quality of service, especially for services requiring low delay and high bit error rates, as traditional error-correcting codes and retransmission schemes either introduce redundancy or increase delay, failing to adequately protect against impulse noise.
Innovation Solution
A method and system that sort data into retransmissive and non-retransmissive service types at the PMS-TC layer, allocating resources and encapsulating data into Data Transfer Units (DTUs), allowing selective retransmission of only retransmissive service data damaged by impulse noise, thereby reducing bit errors and improving system stability and user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Reed-Solomon codes are used to correct impulse noise errors, then error correction capability is improved, but transmission rate decreases due to increased redundancy
Solution Approach 1:
The patent segments service data into different QoS categories (delay-sensitive and delay-tolerant) at the PMS-TC layer, allowing differential retransmission strategies. Delay-tolerant data can be retransmitted to improve reliability, while delay-sensitive data is not retransmitted to maintain transmission rate and low latency.
Solution Approach 2:
The system dynamically adjusts retransmission behavior based on service type and QoS requirements. The retransmission mechanism is activated selectively for different data streams, enabling the system to optimize between reliability and transmission rate depending on the specific service being transmitted.
2Reliability
If physical-layer retransmission is implemented to reduce bit error rate, then service stability is improved, but service delay increases
Solution Approach 1:
The patent applies different quality treatments to different parts of the data stream based on their QoS requirements. Delay-tolerant services receive retransmission treatment for improved stability, while delay-sensitive services bypass retransmission to maintain low latency, achieving local optimization of both stability and delay characteristics.
Solution Approach 2:
The retransmission mechanism dynamically adapts its behavior based on the service type identified at the PMS-TC layer. The system can switch between retransmission and non-retransmission modes depending on whether the data belongs to delay-sensitive or delay-tolerant services, optimizing the trade-off between stability and delay.
3Reliability
If Reed-Solomon codes are used for stable noise protection, then resistance to stable noise is improved, but impulse noise resistance capability is weakened
Solution Approach 1:
The PMS-TC layer acts as an intermediary between the physical layer error correction and the higher layer services. It provides an additional layer of protection by implementing service-specific retransmission for delay-tolerant services, complementing the RS code protection and creating a multi-layer defense against both stable and impulse noise.
Data Source
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AI summary
A method includes the following steps: sorting service data into retransmissive service data and non-retransmissive service data; allocating resources to the retransmissive service data and the non-retransmissive service data respectively, and encapsulating the data into DTUs according to the allocated resources; sending, by a sender, the DTU that bears the service data; receiving ,by the sender, a retransmission request that is sent according to a result of judging a bit error and a type of the retransmissive service, where the retransmission request carries information about the DTU that needs to be retransmitted; and retransmitting, by the sender, a corresponding DTU that bears the retransmissive service data requested for retransmission.