Polar Channel Encoding with CRC Selection for Low False Alarms
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Solution Overview
Problem
In 5G mobile communications systems, the existing channel encoding methods fail to adequately 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 CRC polynomials on information bits to obtain a first bit sequence, followed by polar encoding, which satisfies the FAR requirement and ensures normal communication performance. The CRC polynomials used are of the form D^6+D^5+1, D^6+D^5+D^4+D^3+1, and others, ensuring the inclusion of L CRC bits and A information bits, where L and A are positive integers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional channel encoding methods are used, then the encoding process is simple, but the false alarm rate requirement is not satisfied
Solution Approach 1:
The patent combines CRC encoding and polar encoding into a unified channel encoding scheme. The information bits first undergo CRC encoding to generate CRC bits, forming an extended bit sequence, which then undergoes polar encoding. This merging of two encoding methods achieves the required false alarm rate performance while maintaining practical implementation complexity.
Solution Approach 2:
The patent applies CRC encoding as a preliminary step before polar encoding. By first attaching CRC bits to the information bits to form an extended sequence, the system prepares the data with enhanced error detection capability before the main polar encoding process, ensuring the final encoded output meets the false alarm rate requirement.
2Reliability
If CRC encoding is performed with L=6 CRC bits, then the FAR requirement is satisfied, but the bit sequence length increases
Solution Approach 1:
The patent specifies L=6 as the optimal number of CRC bits to achieve the required false alarm rate performance. This parameter selection balances the trade-off between error detection capability and overhead, providing sufficient reliability without excessive bit sequence extension. The specific CRC polynomials are also optimized for this bit length.
3Adaptability or versatility
If multiple CRC polynomials are provided, then the adaptability is improved, but the selection complexity increases
Solution Approach 1:
The patent provides a universal set of 10 CRC polynomials that can be applied to various information bit lengths and communication scenarios. This multi-functional polynomial set enables the encoding system to adapt to different requirements (eMBB, URLLC, mMTC) without requiring separate polynomial definitions for each case, simplifying the overall system design while maintaining versatility.
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.