HARQ Polar Code Retransmission Using Enhanced Polar Codes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current HARQ mechanisms in wireless communication networks, particularly in 5G systems, lack efficient decoding methods for polar and enhanced polar codes, leading to suboptimal performance in data transmission and increased latency.
Innovation Solution
The implementation of a HARQ transmission mechanism that utilizes polar codes and enhanced polar codes, with the HARQ polar code transmission component generating codewords and adjusting encoding strategies based on decoding success, including the use of cyclic redundancy check (CRC) bits and enhanced polar codes to improve decoding performance at the receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional HARQ mechanisms are used with polar codes, then the system maintains basic transmission functionality, but decoding performance is suboptimal and latency increases
Solution Approach 1:
The patent changes the parameter of code structure by introducing enhanced polar codes with higher design rates and optimized codebook structures. This allows the system to achieve better decoding performance while reducing the number of retransmissions needed, thereby lowering latency without sacrificing reliability
Solution Approach 2:
The patent implements dynamic adaptation by selecting between different codebooks (first codebook with rate 1/2, second codebook with rate 3/4) based on channel conditions and transmission requirements. This dynamic codebook selection optimizes both decoding performance and latency by adapting to varying network conditions
2Productivity
If traditional polar codes are used in HARQ, then the implementation is simpler, but data transmission rates are lower and overhead in re-transmissions is higher
Solution Approach 1:
The patent changes the code rate parameter from traditional fixed rates to dynamic rates (1/2 and 3/4), enabling higher data transmission rates while maintaining efficient retransmission overhead through adaptive selection based on channel quality and packet size
Solution Approach 2:
The patent creates a universal HARQ mechanism that can handle both initial transmissions and retransmissions using the same enhanced polar code framework, reducing overhead by eliminating the need for separate coding schemes for different transmission types
3Reliability
If enhanced polar codes are implemented, then error correction capability improves and minimum Hamming distances increase, but system complexity increases
Solution Approach 1:
The patent changes the structural parameters of polar codes to create enhanced versions with higher minimum Hamming distances and improved error correction capability, while managing complexity through standardized codebook designs that can be efficiently implemented
Solution Approach 2:
The patent segments the codebook into different types (first codebook for rate 1/2, second codebook for rate 3/4) with specific structures optimized for different scenarios, allowing the system to achieve high reliability through specialized designs while keeping overall complexity manageable through modular organization
Data Source
Figure 1
Figure 2A~2D
Figure 3
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.