Dynamic Redundancy Version Control for High Code Rate LTE
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LTE systems, the current protocol limits the code rate to less than 1.0, resulting in inefficient data transmission and demodulation performance due to insufficient redundancy versions for retransmissions, especially when the code rate exceeds 1.0, leading to incomplete data transmission and reduced throughput.
Innovation Solution
The method allows the receiving and sending devices to dynamically determine the redundancy version and starting position in a virtual circular buffer for each retransmission, enabling flexible control and maintaining a higher code rate by maintaining a transmission count and using it to calculate the redundancy version, thereby supporting a higher code rate and improving system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the code rate is increased to improve transmission efficiency, then throughput is improved, but the number of redundancy versions becomes insufficient and demodulation performance deteriorates
Solution Approach 1:
The patent changes the parameter of redundancy version numbering from a fixed 4-version system to a dynamic system where the number of redundancy versions adapts to the code rate. When code rate exceeds 1.0, the system dynamically increases the number of redundancy versions beyond 4, allowing sufficient coverage of all coded bits while maintaining high transmission efficiency.
2Productivity
If the code rate exceeds 1.0 to transmit more data, then transmission efficiency is improved, but the fixed four redundancy versions cannot cover all coded bits, causing incomplete data transmission
Solution Approach 1:
The patent introduces dynamic adaptation where the number of redundancy versions is no longer fixed at 4 but dynamically adjusts based on the code rate. When code rate exceeds 1.0, the system automatically increases the redundancy version count to ensure complete coverage of all coded bits, transforming a static system into a dynamic one that adapts to varying transmission requirements.
3Reliability
If more redundancy versions are used to ensure complete data transmission, then demodulation performance is improved, but the complexity of managing redundancy versions increases
Solution Approach 1:
The patent changes the management approach by making the redundancy version parameter dynamic rather than fixed. The system automatically adjusts the number of redundancy versions based on the code rate, eliminating the need for complex manual management while ensuring complete data transmission coverage even when code rate exceeds 1.0.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Embodiments of the present invention disclose an information transmission method, a receiving device, a sending device, and a system. The method includes: receiving, by a receiving device, coded data of ith retransmission; obtaining a transmission count RvCnt(i) of the ith retransmission; determining a redundancy version Rv(i) of the ith retransmission based on the transmission count RvCnt(i) of the ith retransmission; combining the coded data of the ith retransmission into a virtual circular buffer of a data block based on the redundancy version Rv(i) of the ith retransmission; and performing decoding. The method may not be limited by a current quantity of redundancy versions. Therefore, a column starting position of coded data of each retransmission in the virtual circular buffer can be flexibly determined, and a requirement of a high transmission code rate is met. The present invention further discloses a receiving device, a sending device, and an information transmission system.