Segmented Polar Code Scrambling for PBCH Decoding Efficiency
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Solution Overview
Problem
The existing channel coding methods in 5G communications systems, particularly for the Physical Broadcast Channel (PBCH), face challenges in encoding and decoding performance, especially in scenarios with poor channel quality, where the current polar code implementation does not adequately ensure reliable transmission of control information.
Innovation Solution
The proposed solution involves performing polar encoding on a bit sequence that includes control information and a cyclic redundancy check (CRC) sequence, fragmenting the encoded sequence into multiple subsequences, scrambling these subsequences using defined scrambling sequences, and then modulating and mapping them for transmission. This process reduces signaling overhead and simplifies decoding by using newly defined scrambling sequences that carry additional information bits, enabling efficient polar decoding and CRC checks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polar code is applied to PBCH channel coding in 5G, then encoding and decoding performance can be improved, but the complexity of decoding operations increases
Solution Approach 1:
The patent divides the encoded sequence into multiple segments and performs separate decoding operations on each segment. This segmentation approach reduces the overall decoding complexity by breaking down the large-scale polar code decoding into smaller, more manageable sub-problems, while still achieving reliable transmission through combined decoding results
2Reliability
If multiple decoding attempts are performed to ensure reliable transmission in poor channel conditions, then transmission reliability improves, but the number of decoding operations and time consumption increase
Solution Approach 1:
The patent performs preliminary processing on the encoded sequence before decoding, including segmentation and preliminary checks. This preliminary action prepares the data in advance so that the actual decoding operations can be performed more efficiently with fewer retry attempts, reducing overall decoding time while maintaining reliability
3Ease of manufacture
If traditional TBCC coding is used for PBCH, then implementation is straightforward, but encoding and decoding performance is insufficient for poor channel conditions
Solution Approach 1:
The patent modifies key parameters of the polar code implementation for PBCH, including code length, segmentation patterns, and scrambling sequences. These parameter changes are specifically optimized to improve transmission reliability in poor channel conditions while keeping the implementation complexity manageable through systematic parameter selection
Data Source
AI summary
This application discloses a transmission method, a transmission apparatus, and a communications device. The transmission method includes: performing polar encoding on a bit sequence, to obtain an encoded sequence, where the bit sequence includes control information and a cyclic redundancy check CRC sequence; fragmenting the encoded sequence, to obtain n encoded subsequences, where n is an integer, and n>0; and scrambling the n encoded subsequences by using n scrambling sequences respectively, to obtain n scrambled sequences. In the transmission method, the n scrambling sequences are newly defined based on encoding and decoding features of a polar code, and the n scrambling sequences additionally carry ┌log2n┐-bit information. According to the foregoing encoding method, signaling overheads are reduced.