CRC-Polar Channel Encoding for 5G False Alarm Rate Control
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Solution Overview
Problem
In 5G mobile communications systems, the existing channel encoding methods fail to effectively satisfy the false alarm rate (FAR) requirement, which is crucial for ensuring reliable data transmission and communication quality, especially in scenarios like enhanced mobile broadband (eMBB), ultra-reliable low-latency communications (URLLC), and massive machine-type communications (mMTC).
Innovation Solution
The proposed solution involves performing cyclic redundancy check (CRC) encoding using specific polynomials on information bits to generate a first bit sequence, followed by polar encoding, which ensures that the false alarm rate requirement is met, thereby ensuring normal communication performance. The CRC polynomials used include D^6+D^5+1, D^6+D^5+D^4+D^3+1, and others, with L CRC bits and A information bits, where L and A are positive integers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing channel encoding methods are used in 5G systems, then the encoding process is simple, but the false alarm rate requirement cannot be satisfied
Solution Approach 1:
The patent combines CRC encoding and polar encoding into a unified channel encoding scheme. The CRC encoder generates check bits that are concatenated with information bits, forming a bit sequence that is then processed by the polar encoder. This merging of two encoding techniques achieves the required false alarm rate performance while maintaining practical implementation complexity.
Solution Approach 2:
The patent creates a composite encoding structure by concatenating CRC code and polar code. The CRC portion provides robust error detection capability to meet false alarm rate requirements, while the polar portion provides efficient channel coding. This composite approach leverages the strengths of both encoding methods to achieve reliable communication in 5G scenarios.
2Reliability
If CRC encoding with multiple polynomial options is performed, then the false alarm rate is reduced, but the encoding complexity increases
Solution Approach 1:
The patent provides multiple CRC polynomial options (including degree-6 and degree-7 polynomials) that can be selected based on specific communication requirements. By offering different polynomial choices with varying properties, the system can adjust the encoding parameters to achieve the desired false alarm rate performance while managing complexity through standardized polynomial selections.
Solution Approach 2:
The patent performs CRC encoding before polar encoding in a predetermined sequence. The CRC check bits are generated first using selected polynomials, then concatenated with information bits, and finally processed by the polar encoder. This preliminary CRC encoding ensures that false alarm rate requirements are addressed before the more complex polar encoding operation.
3Reliability
If polar encoding alone is used, then the encoding speed is fast, but the communication reliability is insufficient
Solution Approach 1:
The patent merges CRC encoding (which provides strong error detection for reliability) with polar encoding (which provides fast encoding speed). The CRC encoder processes information bits to generate check bits, which are then concatenated and processed by the polar encoder. This combination maintains the speed advantage of polar encoding while adding the reliability benefit of CRC-based false alarm rate control.
Solution Approach 2:
The patent performs CRC encoding as a preliminary step before polar encoding. By generating CRC check bits first and concatenating them with information bits, the system prepares a enhanced input sequence for the polar encoder. This preliminary action ensures that reliability requirements are built into the encoded sequence before the fast polar encoding operation occurs.
Data Source
AI summary
This application provides an encoding method and apparatus in wireless communications between a network device and a terminal. The method includes: performing CRC encoding on A to-be-encoded information bits based on a CRC polynomial, to obtain a first bit sequence, where the first bit sequence includes L CRC bits and A information bits, L=6; and performing polar encoding on the first bit sequence. Based on an improved CRC polynomial, encoding satisfying an FAR requirement is implemented.