Polar Channel Coding With CRC Bit Repositioning for UE Links
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Solution Overview
Problem
Polar codes in wireless communication systems face efficiency issues when used without Cyclic Redundancy Check (CRC) bits, particularly in low information bit scenarios, leading to decreased transmission efficiency compared to Tail-Biting Convolutional Codes, and simply removing CRC in traditional LTE systems renders error check and target receiver identification functions impossible.
Innovation Solution
A method that generates a third bit block by combining first and second bit blocks, where the position of bits in the third block is adjusted based on the number of associated bits in the first block, allowing for unequal error protection and improved decoding accuracy by using CRC bits as both an outer code and for error checking and target receiver identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polar code adopts CRC bit, then error checking function is improved, but transmission efficiency decreases
Solution Approach 1:
The patent extracts the CRC function from the traditional position and repositions certain data bits to serve dual purposes: as information bits and as error checking bits. This eliminates the need for separate CRC bits, thereby improving transmission efficiency while maintaining error checking capability through the repositioned bits that participate in both data transmission and error detection.
Solution Approach 2:
The patent makes certain bits universal by allowing them to serve multiple functions simultaneously. These bits are positioned to act as both information-carrying bits and error-checking bits, thereby eliminating the need for dedicated CRC bits and improving overall transmission efficiency while maintaining reliability.
2Productivity
If polar code does not adopt CRC, then transmission efficiency is improved, but error checking function is lost
Solution Approach 1:
The patent introduces repositioned bits as intermediaries that bridge the gap between information transmission and error checking. These bits are strategically positioned to serve as mediators that carry information while simultaneously enabling error detection, thus eliminating the need for separate CRC mechanisms.
Solution Approach 2:
The patent creates multi-functional bits that can serve as both information bits and error checking bits, thereby maintaining error checking capability without the overhead of traditional CRC bits, thus improving transmission efficiency while preserving reliability.
3Device complexity
If bits are mapped to sub-channels without position adjustment, then device complexity is reduced, but decoding accuracy decreases
Solution Approach 1:
The patent applies local quality by differentiating the positioning of different bit types. Information bits and error checking bits are positioned differently in the bit block based on their specific functions, allowing each type of bit to be optimally placed for its purpose, thereby improving decoding accuracy without significantly increasing overall system complexity.
Data Source
AI summary
The disclosure discloses a method and device in UE and a base station for channel coding. A first node first determines a first bit block and then transmits a first radio signal, wherein bits of the first bit block are used to generate bits of a second bit block, a third bit block comprises bits of the second bit block and the first bit block, and the third bit block is used to generate the first radio signal. The first bit block, the second bit block and the third bit block comprise P1, P2 and P3 bits, respectively.