PBCH Synchronization With CRC and Polar Encoding in 5G NR
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Solution Overview
Problem
Current mobile communication systems, particularly in 5G New Radio (NR), face challenges in error check-based synchronization and broadcasting, where existing methods lack efficiency in conveying additional information through synchronization signals and broadcast channels, leading to potential errors and reduced reliability.
Innovation Solution
The implementation of error check-based synchronization using secondary synchronization signals (SSS) and Physical Broadcast Channels (PBCH), where additional information is encoded using Polar codes, with error check bits such as cyclic redundancy check (CRC) bits, and transmitted alongside primary synchronization signals, to enhance data integrity and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If additional information is provided by SSS and/or PBCH in 5G NR, then the quantity of transmitted information increases, but the reliability of transmission deteriorates due to potential errors
Solution Approach 1:
The patent applies feedback through error check bits (CRC) that are attached to the information data before encoding. The receiver uses these CRC bits to verify the integrity of received data, and if errors are detected, requests retransmission or corrects errors, thus maintaining reliability while enabling additional information transmission.
Solution Approach 2:
The patent introduces Polar codes as an intermediary encoding mechanism that transforms additional information data into a reliable transmitted signal. The encoding process includes attaching error check bits and applying systematic encoding, which acts as a mediator between the information source and the communication channel, ensuring reliable transmission despite channel impairments.
2Reliability
If error check bits are attached to scrambled PBCH data and timing information, then transmission reliability improves through error detection, but device complexity increases due to additional processing steps
Solution Approach 1:
The patent applies preliminary action by attaching error check bits (CRC) to the scrambled PBCH data and timing information before the Polar encoding process. This preliminary error checking preparation enables reliable error detection at the receiver without requiring complex post-processing, as the error check capability is built into the transmitted signal structure in advance.
3Reliability
If Polar encoding is applied to scrambled PBCH data with error check bits, then information reliability improves, but processing time increases
Solution Approach 1:
The patent applies parameter changes by using Polar codes with specific encoding parameters optimized for the PBCH transmission. The encoding process transforms the scrambled data with attached error check bits into a reliable format, and the systematic nature of Polar codes allows for efficient encoding that balances reliability improvement with acceptable processing time requirements.
Data Source
AI summary
Systems, methods, and instrumentalities are disclosed for error check-based synchronization. Physical Broadcast Channel (PBCH) data may be determined. A scrambling (e.g., a first scrambling) of the PBCH data may be scrambled via a sequence (e.g., a first sequence). The first sequence may be based on a cell ID and/or timing information. Error check bits may be attached to the scrambled PBCH data and to the timing information. The error check bits may include one or more cyclic redundancy check (CRC) bits. The scrambled PBCH data, the timing information (e.g., the unscrambled timing information), and/or the attached error check bits may be polar encoded. The polar encoding may result in polar encoded bits. A scrambling (e.g., a second scrambling) of the polar encoded bits may be scrambled via a sequence (e.g., a second sequence). The first sequence and the second sequence may be different. The polar encoded bits may be transmitted.