Hybrid Polar Code Rate Matching for Reliable URLLC HARQ
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Solution Overview
Problem
Current wireless communication technologies, such as NR and LTE, face limitations in supporting ultra-reliable low latency communications (URLLC) due to constraints on code length and fixed rate matching schemes, which hinder their effectiveness in incremental redundancy (IR)-hybrid automatic repeat request (HARQ) processes.
Innovation Solution
The implementation of adjusted fractally enhanced kernel polar codes, which allow for dynamic puncturing and shortening based on code rate, enabling flexible code rate adjustments and eliminating spikes in achievable signal-to-noise ratios, thereby improving communication reliability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed rate matching schemes are used in current wireless communication technologies, then implementation simplicity is maintained, but adaptability to different code rates and block lengths is limited
Solution Approach 1:
The patent implements dynamic code generation where the code rate and block length are adjustable parameters rather than fixed values. The polar code construction adapts to different code rates by dynamically selecting the number of information bits and frozen bits, enabling flexible rate matching for URLLC applications while maintaining a unified code structure.
Solution Approach 2:
The patent changes key parameters of the polar code including block length N, number of information bits K, and code rate R=K/N. By varying these parameters dynamically based on channel conditions and traffic requirements, the system achieves adaptability to different code rates without requiring multiple fixed schemes, resolving the contradiction between versatility and complexity.
2Reliability
If code length constraints are imposed on polar codes, then decoding complexity is reduced, but communication reliability for URLLC is compromised
Solution Approach 1:
The patent segments the polar code into information bits and frozen bits, with the frozen bits strategically placed to enable reliable decoding. This segmentation allows the use of longer code lengths for improved reliability while maintaining manageable decoding complexity through the structured arrangement of bits and the use of successive cancellation decoding.
3Reliability
If incremental redundancy HARQ processes are implemented, then communication reliability is improved, but fixed rate matching schemes fail to provide optimal performance
Solution Approach 1:
The patent implements dynamic rate matching for IR-HARQ processes where the code rate can be adjusted across different transmission rounds. The system dynamically selects appropriate code rates based on channel conditions and decoding success, enabling optimal performance for HARQ retransmissions rather than being constrained by fixed rate matching schemes.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless communication device may determine to block puncture or to block shorten a set of transmitted bits of an adjusted fractally enhanced kernel polar code for a communication of an incremental redundancy (IR)-hybrid automatic repeat request (HARQ) process based at least in part on a code rate associated with the communication of the IR-HARQ process. The wireless communication device may generate the adjusted fractally enhanced kernel polar code for the communication based at least in part on determining to block puncture or to block shorten the set of transmitted bits. The wireless communication device may transmit the communication using the adjusted fractally enhanced kernel polar code. Numerous other aspects are provided.