Punctured Polar Retransmission for Low-Latency Wireless Reliability
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Solution Overview
Problem
Existing wireless communication systems face challenges in achieving high performance and low latency due to limitations in error correction techniques, particularly in scenarios with strict latency and reliability requirements, where traditional HARQ schemes may not provide sufficient robustness.
Innovation Solution
The implementation of a communication system that encodes data using Polar codes, generates a puncture pattern based on bit error probabilities, and performs puncturing to optimize data transmission, allowing for efficient retransmissions to ensure ultra-reliable low-latency communication (URLLC) by adjusting coding rates and allocating resources effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional HARQ schemes are used for error correction, then communication reliability is improved, but latency increases due to multiple retransmissions
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing multiple puncture patterns before transmission. The receiver uses these pre-prepared patterns to quickly identify and correct errors without requiring multiple retransmission cycles, thus reducing latency while maintaining reliability
Solution Approach 2:
The patent changes the parameter of puncture pattern selection dynamically. Different puncture patterns are selected based on channel conditions and error types, allowing the system to adaptively optimize between reliability and latency by choosing patterns that minimize retransmissions
2Reliability
If more retransmissions are performed to achieve desired communication performance, then reliability is improved, but latency increases due to delay associated with retransmissions
Solution Approach 1:
The patent extracts and transmits only the necessary punctured bits rather than retransmitting entire code blocks. By identifying and sending only the specific bits that need correction, the system achieves the desired communication performance with fewer and shorter retransmissions, reducing overall latency
3Loss of time
If puncturing is applied to reduce transmission overhead, then latency is reduced, but reliability may deteriorate if insufficient bits are transmitted
Solution Approach 1:
The patent applies preliminary action by pre-calculating multiple puncture patterns with different levels of redundancy before transmission. This allows the system to select the appropriate pattern that provides sufficient error correction capability while minimizing transmitted bits, thus reducing latency without sacrificing reliability
Solution Approach 2:
The patent makes the puncture pattern selection dynamic rather than fixed. The system can adaptively choose different puncture patterns based on channel conditions and error characteristics, optimizing the balance between transmission efficiency (latency) and error correction capability (reliability)
Data Source
AI summary
Various aspects of the disclosure relate to retransmission techniques for communication of information (e.g., for wireless communication). In some aspects, if a device's first transmission including punctured encoded data fails, the device's second transmission (e.g., in response to a NAK) may involve transmitting the punctured bits. In some aspects, the coding rate used for encoding the data for the first transmission is selected to meet an error rate (e.g., a block error rate) for the second transmission. The second transmission may also include at least some of the encoded data. In some aspects, the puncturing may be performed according to a puncture pattern that is generated based on bit error probabilities of bit positions for encoded data.