NR PBCH Payload Bit Ordering for Early Polar Decoding
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Solution Overview
Problem
Existing solutions for transmitting the New Radio Physical Broadcast Channel (NR PBCH) do not effectively exploit known or partially known bits, leading to suboptimal performance of polar codes in decoding the channel.
Innovation Solution
The method involves identifying payload bits of the NR PBCH with known values and strategically placing them to enhance polar code performance. Additionally, Parity Check (PC) bits are intentionally placed at specific locations to further improve decoding efficiency, and a known-bit interleaver is used to compensate for the effects of the CRC interleaver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If known or partially known bits are not strategically placed in polar code encoding, then the decoding process requires more processing time and has higher block error rate, but implementing strategic placement increases the complexity of the encoding process
Solution Approach 1:
The patent applies preliminary action by identifying and strategically placing known or partially known bits at specific positions in the polar code encoding process before transmission. This pre-positioning of known bits at locations where the receiver can expect them enables the receiver to perform early verification and terminate decoding early when successful, thereby reducing block error rate and processing time without significantly increasing encoder complexity
Solution Approach 2:
The patent applies local quality by treating different bit positions differently in the polar code structure. Specifically, known bits are placed at certain positions while other positions carry unknown information bits. This differentiation allows the receiver to exploit the known bit values at specific locations for early decoding termination, improving reliability without requiring complex changes to the overall encoding structure
2Loss of time
If standard polar code encoding is used without optimizing bit order, then the decoding processing time is longer, but optimizing bit order requires additional interleaving operations that increase encoding complexity
Solution Approach 1:
The patent applies preliminary action by performing a specific interleaving operation on known bits before they are encoded into the polar code. This pre-interleaving places known bits at positions that enable early decoding termination, thereby reducing decoding processing time. The interleaving is applied only to known bits rather than the entire code block, which limits the increase in encoding complexity
Solution Approach 2:
The patent applies segmentation by separating the treatment of known bits from unknown information bits in the polar code encoding process. A dedicated known-bit interleaver is applied only to the known bit portion, while the rest of the encoding process follows standard polar code procedures. This segmentation allows the system to gain decoding time benefits without requiring complete reworking of the encoding architecture
Data Source
AI summary
Systems and methods are described herein that allow information carrying bits of a transmission block to be placed at higher-reliability positions prior to transmission. An exemplary method includes generating a set of payload bits to be encoded for transmission, wherein the set of payload bits includes at least one known bit, interleaving the set of payload bits to generate an interleaved set of payload bits, wherein the interleaved set includes the at least one known bit in a predetermined position in the interleaved set, providing the interleaved set to a cyclic redundancy check (CRC) encoder to generate CRC-interleaved set of payload bits, wherein the CRC-interleaved set includes the at least one known bit in a predetermined position within the CRC-interleaved set, and encoding the CRC-interleaved set for transmission to a wireless device. Associated network nodes and wireless devices are included.