Polar Code Repetition Order for Adaptive 5G Retransmission
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Solution Overview
Problem
Conventional wireless communication systems, particularly in 5G networks, face challenges in ensuring optimized transmission performance during repeated transmissions due to limitations in interleaving techniques, which do not adequately account for channel conditions and error correction, leading to suboptimal decoding success rates.
Innovation Solution
The implementation of a polar code-based adaptive transmission method that determines a repetition order based on channel polarization and quality information, using bit-reversal calculations to optimize the retransmission pattern, ensuring improved decoding success rates by adjusting the transmission order dynamically according to channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional interleaving techniques are used for puncturing, then the transmission can be completed with basic error correction, but the decoding success rate deteriorates in repeated transmissions due to inadequate consideration of channel conditions
Solution Approach 1:
The patent applies dynamics by making the interleaving pattern adaptive rather than fixed. The interleaver dynamically adjusts its behavior based on transmission type (initial vs. retransmission) and channel conditions. Specifically, the patent uses different interleaving strategies: for initial transmission, it uses a pattern optimized for puncturing, while for retransmissions, it switches to a repetition-optimized pattern, allowing the system to adapt to varying channel conditions and improve decoding success rates.
Solution Approach 2:
The patent changes the interleaving parameter (pattern) based on transmission conditions. It modifies the interleaving behavior by applying bit-reversal calculations specifically for retransmissions, transforming the interleaving pattern from a fixed puncturing-optimized design to a dynamic design that can switch between puncturing and repetition modes. This parameter change enables the system to optimize for repetition in retransmission scenarios, thereby improving reliability.
2Ease of manufacture
If the interleaver is designed to interleave codeword for puncturing only, then the puncturing transmission is optimized, but the transmission optimized for repetition cannot be guaranteed when retransmission is performed
Solution Approach 1:
The patent makes the interleaver universal by enabling it to perform multiple functions: it can operate in puncturing mode for initial transmissions and switch to repetition mode for retransmissions. The same interleaver structure handles both puncturing and repetition operations by applying different processing rules (standard interleaving vs. interleaving with bit-reversal), eliminating the need for separate interleavers for each transmission type and improving retransmission performance while maintaining design simplicity.
Solution Approach 2:
The patent introduces dynamics into the interleaver design, allowing it to change its operation mode based on transmission requirements. The interleaver dynamically switches between puncturing-optimized and repetition-optimized behaviors, making it versatile enough to handle both initial transmissions and retransmissions effectively. This dynamic capability ensures good performance in both scenarios without requiring complex separate designs.
3Device complexity
If fixed transmission pattern is used, then the device complexity is reduced, but the decoding success rate deteriorates when channel conditions vary
Solution Approach 1:
The patent changes the transmission pattern parameter based on channel conditions and transmission type. It uses bit-reversal calculations to generate different transmission patterns for retransmissions compared to initial transmissions. This parameter change allows the system to adapt to varying channel conditions without requiring complex real-time optimization algorithms, maintaining relatively simple device complexity while improving decoding success rates through pattern diversity.
Solution Approach 2:
The patent applies preliminary action by pre-determining the repetition order using bit-reversal calculations before actual transmission. Instead of making complex decisions in real-time during transmission, the system pre-calculates the optimal pattern based on the polar code structure and channel characteristics. This preliminary determination simplifies the transmission process while ensuring optimized performance for the given channel conditions.
Data Source
AI summary
The present disclosure relates to a 5th Generation (5G) or a pre-5G communication system provided to support a higher data transmission rate than a system beyond a 4th Generation (4G) communication system such as Long Term Evolution (LTE). The purpose of the present disclosure is to maximize adaptive transmission performance by designing a puncturing order and a repetition order individually in optimized order. An operation method of a transmission device for adaptive transmission of a codeword according to an embodiment of the present disclosure includes generating a codeword using a polar code and transmitting a packet including at least one codeword indicated by a repetition order when bit repetition is needed. The repetition order is determined based on at least one of channel polarization or channel quality information.