Low Code Rate Channel Coding for MTC Data Reliability
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Solution Overview
Problem
Machine Type Communication (MTC) devices, such as smart meters, face challenges in ensuring reliable and extensive data transmission due to energy limitations and severe path loss, leading to poor communication environments where existing channel coding methods fail to maintain reliability without increasing terminal power.
Innovation Solution
A channel coding/decoding method that codes source data at a code rate less than 1/3, punctures the bitstream, and maps it into multiple burst sequences, ensuring each burst is fully occupied, allowing for interleaved modulation and transmission without increasing terminal power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing channel coding method is used, then terminal power consumption is reduced, but reliability and coverage of data transmission cannot be ensured in poor communication environments
Solution Approach 1:
The patent changes the code rate parameter from conventional higher rates (e.g., 1/3) to a lower rate (p < 1/3), which increases redundancy and improves reliability without requiring higher transmit power. This parameter change allows the system to achieve better error correction capability in poor communication environments while maintaining energy efficiency.
2Reliability
If transmit power is increased to ensure reliability of data transmission, then communication reliability is improved, but battery life is shortened
Solution Approach 1:
By changing the code rate parameter to a lower value (p < 1/3), the patent achieves improved transmission reliability through increased redundancy rather than through increased transmit power. This allows the device to maintain reliable communication while consuming less battery energy, thereby extending operational duration.
3Reliability
If code rate is reduced to improve reliability, then data transmission reliability is enhanced, but transmission efficiency decreases
Solution Approach 1:
The patent segments the data transmission into multiple bursts (q bursts where q > 4), with each burst fully occupied by the coded bitstream. This segmentation allows the low code rate to be applied effectively across multiple transmission opportunities, improving reliability while managing the impact on transmission efficiency through parallel burst structure.
Solution Approach 2:
The patent employs periodic transmission through multiple bursts, where the coded data is transmitted in q separate bursts rather than a single continuous stream. This periodic action allows for better error correction across multiple transmission intervals, improving reliability while maintaining acceptable overall transmission efficiency.
Data Source
AI summary
Embodiments of the present invention provide a channel coding method for a data exchange service, and a device. The method includes: coding source data to generate a first bitstream, where a code rate of a data part of the source data is p, and p is less than ⅓; puncturing the first bitstream to generate a second bitstream; mapping, in an interleaved manner, the second bitstream to q bursts to generate q burst sequences, for modulation, where the second bitstream fully occupies each burst sequence of the q burst sequences, and q is an integer greater than 4; and sending the q modulated burst sequences to a receive end. In the embodiments of the present invention, a code rate of channel coding for a data exchange service is reduced, so that reliability of terminal data transmission can be improved at same power consumption or less power consumption.