Polar-Code HARQ Retransmission With CRC-Free Enhanced Coding
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G networks, lack an efficient Hybrid Automatic Repeat Request (HARQ) mechanism for decoding polar codes at receivers, leading to suboptimal performance in data transmission.
Innovation Solution
The implementation of a HARQ transmission method that generates a first polar code with CRC bits, followed by a second enhanced polar code without CRC bits, to improve decoding success at the receiver, thereby enhancing data transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a first polar code with CRC bits is transmitted for HARQ, then error detection capability is improved, but transmission overhead increases
Solution Approach 1:
The transmission is divided into two distinct phases: initial transmission with CRC bits for error detection, and retransmission without CRC bits for efficiency. This segmentation allows the system to obtain error detection capability when needed while reducing overhead during retransmissions.
Solution Approach 2:
The CRC bits are extracted and removed from retransmission packets after the initial transmission. This extraction maintains the error detection capability established in the first transmission while eliminating the overhead of redundant CRC bits in subsequent transmissions.
2Productivity
If polar codes are used for HARQ transmission, then data transmission rate is improved, but decoding performance at receiver deteriorates
Solution Approach 1:
CRC bits are attached to the polar code during initial transmission to establish error detection capability before data transmission begins. This preliminary action ensures that the receiver can reliably detect errors and request retransmissions, maintaining decoding performance while enabling high-speed polar code transmission.
Solution Approach 2:
The system implements HARQ feedback mechanism where the receiver sends acknowledgment signals based on decoding results. This feedback loop allows the transmitter to retransmit data if decoding fails, maintaining reliability while utilizing the high data transmission rate of polar codes.
Data Source
AI summary
The present disclosure describes a method, an apparatus, and a computer readable medium for hybrid automatic repeat request (HARQ) transmissions. For example, the method may include generating a first codeword for a first information block, wherein the first codeword is a first polar code, and wherein the first information block includes cyclic redundancy check (CRC) bits; transmitting the first codeword to a receiver; determining that the first polar code is not successfully decoded at the receiver based at least on a first message received from the receiver; generating a second codeword for a second information block, wherein the second codeword is a first enhanced polar code, and wherein the second information block does not include any CRC bits; transmitting the second codeword to the receiver; and determining that the second codeword and the first codeword are successfully decoded at the receiver based at least on a second message received from the receiver.