Cascading Modulation Across Code Blocks for Reliable Low-Latency Communication
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Solution Overview
Problem
Existing communication systems face challenges in achieving ultra-reliable and low-latency data transmission due to limitations in retransmission solutions, particularly in scenarios like URLLC, where waiting for ACK/NACK feedback increases latency, and blind retransmission provides limited gains.
Innovation Solution
Implementing cascading modulation on groups of code blocks to enhance data demodulation performance by increasing Euclidean distance in the constellation diagram, reducing signal-to-noise ratio, and improving decoding success rates through diverse modulation schemes and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ACK/NACK feedback-based retransmission is used, then data transmission reliability is improved, but transmission latency increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple modulation schemes and determining a target modulation scheme before retransmission occurs. The network device determines the target modulation scheme for retransmission based on the initial transmission modulation scheme, enabling faster retransmission without waiting for detailed feedback analysis, thus reducing latency while maintaining reliability
2Loss of time
If blind retransmission is used, then transmission latency is reduced, but data demodulation performance is limited
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the modulation scheme parameter for retransmission. The network device changes the modulation scheme from the initial transmission to a target modulation scheme determined based on channel conditions and initial transmission performance, thereby improving data demodulation performance while maintaining low latency through blind retransmission
3Device complexity
If the same modulation scheme is used for retransmission, then system complexity is reduced, but data demodulation performance is limited
Solution Approach 1:
The patent applies dynamics by making the modulation scheme adaptive rather than static. The network device dynamically selects a target modulation scheme for retransmission based on the initial transmission modulation scheme and channel conditions, allowing the system to adapt to changing channel characteristics and improve demodulation performance without excessive complexity
Data Source
AI summary
This application provides a communication method and a related apparatus. In the method, a first communication device determines a first target transport block TB, where the first target TB includes at least one modulation symbol, the at least one modulation symbol is obtained by modulating one bit group by using a first modulation scheme, the one bit group includes at least one bit of each of at least two first code blocks CBs, and the at least two first CBs are determined based on a to-be-transmitted TB. The first communication device sends the first target TB to a second communication device, and correspondingly, the second communication device receives the first target TB and demodulates the first target TB.