Data Transmission Coding Rate Adaptation for Wireless Reliability
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Solution Overview
Problem
Current data transmission methods over wireless networks, particularly for high-quality multimedia data, fail to effectively differentiate the significance of bits in uncompressed data, leading to inadequate error correction and reduced transmission efficiency.
Innovation Solution
A data transmission method that applies varying coding rates based on the significance of bits or bit groups in uncompressed data and adjusts retransmission speeds according to the number of subpackets, allowing for improved error protection and transmission efficiency by generating retransmission packets with different coding rates and durations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a same coding rate is applied to all bits in uncompressed data, then the transmission process is simple, but significant bits are not adequately protected leading to reduced transmission reliability
Solution Approach 1:
The patent applies different coding rates to different bit groups based on their significance. Significant bits (e.g., MSBs) are assigned lower coding rates for better error protection, while less significant bits (e.g., LSBs) use higher coding rates. This local differentiation resolves the contradiction by providing tailored protection where needed without uniformly increasing complexity across all bits.
Solution Approach 2:
The patent segments uncompressed data into multiple bit groups based on significance levels (e.g., dividing 8-bit pixel data into MSB group and LSB group). Each segment is then encoded with an appropriate coding rate. This segmentation allows the system to achieve reliable transmission of critical bits without the complexity of processing every bit individually with different codes.
2Reliability
If retransmission is performed for all erroneous data packets, then transmission reliability is improved, but transmission time increases reducing productivity
Solution Approach 1:
The patent extracts and identifies only the specific bit groups that contain errors from received packets, rather than retransmitting entire packets. By taking out only the erroneous significant bit groups for retransmission, the system improves reliability where needed while minimizing the volume of retransmitted data, thus maintaining productivity.
Solution Approach 2:
The patent applies partial retransmission by sending back only the necessary portions of erroneous data (specific bit groups) rather than performing excessive full packet retransmissions. This partial action achieves sufficient reliability for critical data while reducing the overall retransmission burden and improving transmission efficiency.
3Speed
If high coding rate is used for all bits, then transmission speed increases, but error correction capability decreases reducing reliability
Solution Approach 1:
The patent applies different coding rates locally to different bit groups based on their significance. Less significant bits use higher coding rates for faster transmission, while significant bits use lower coding rates for better error correction. This resolves the speed-reliability contradiction by optimizing each bit group's coding rate to its specific requirements rather than using a uniform rate.
Solution Approach 2:
The patent changes the coding rate parameter dynamically based on bit significance. By adjusting this key parameter differently for different data portions, the system achieves both high transmission speed for non-critical data and strong error correction for critical data, resolving the contradiction between speed and reliability.
Data Source
AI summary
Provided are a data transmission apparatus and method which apply an appropriate coding rate according to significance of bits or bit groups included in uncompressed data and retransmit all or part of the data when a transmission error occurs in the data while the data is being transmitted over a wireless network. The data transmission apparatus includes a mode termination unit which determines a retransmission mode for an initial transmission packet which has a transmission error; a packet generation unit which generates a retransmission packet, which includes at least part of the initial transmission packet, according to the determined retransmission mode; and a communication unit which transmits the retransmission packet through a communication channel.