5G NR Polar Coding for DCI CRC Masking and Early Decoding
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Solution Overview
Problem
The 5G New Radio (NR) system faces challenges in efficiently encoding and decoding Downlink Control Information (DCI) and Physical Broadcast Channel (PBCH) due to the complexity of channel polarization and the need for reliable data transmission, particularly in scenarios where the number of recursions in Polar codes is large, affecting the reliability and decoding complexity.
Innovation Solution
The implementation of a method that generates DCI payload for NR-PDCCH, attaches Cyclic Redundancy Check (CRC) and masks it with a Radio Network Temporary Identifier (RNTI) using a bitwise modulus 2 addition operation, performs polar encoding, and maps Demodulation Reference Signals (DMRS) onto control resource sets, enabling efficient decoding and early termination of decoding processes in User Equipment (UE).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polar encoding is used for DCI payload with masked CRC bits, then reliability of control information transmission is improved, but device complexity increases due to the complexity of channel polarization
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the polar code generator matrix G_N in lookup tables at the transmitter side. This allows the encoding process to be simplified to matrix multiplication operations using pre-computed values, reducing the computational complexity during real-time transmission while maintaining the reliability benefits of polar coding.
Solution Approach 2:
The patent replaces the complex iterative decoding process with a simplified matrix multiplication approach for encoding. By substituting the mechanical complexity of channel polarization calculations with straightforward linear algebra operations using pre-computed matrices, the system achieves reliable transmission with reduced device complexity.
2Reliability
If advanced interleaving and scrambling techniques are implemented, then false alarm rates are reduced, but processing time increases
Solution Approach 1:
The patent applies preliminary action by pre-defining specific interleaving patterns and scrambling sequences in the system design. These pre-configured techniques are applied directly without requiring complex real-time calculations, thereby reducing false alarm rates while minimizing additional processing time.
3Measurement precision
If DMRS sequences are mapped onto configured control resource set, then channel estimation accuracy is improved, but resource overhead increases
Solution Approach 1:
The patent applies local quality by mapping DMRS sequences specifically onto control resource sets where they are most needed for accurate channel estimation. Rather than uniformly distributing reference signals across all resources, the system concentrates DMRS in critical control regions, improving estimation accuracy where it matters most while minimizing overall resource overhead.
Data Source
AI summary
Provided herein are method and apparatus for channel coding in the fifth Generation (5G) New Radio (NR) system. An embodiment provides an apparatus for a Next Generation NodeB (gNB), including circuitry, which is configured to: generate Downlink Control Information (DCI) payload for a NR-Physical Downlink Control Channel (NR-PDCCH); attach Cyclic Redundancy Check (CRC) to the DCI payload; mask the CRC with an Radio Network Temporary Identifier (RNTI) using a bitwise modulus 2 addition operation, wherein the number of bits for the RNTI is different from the number of bits for the CRC; and perform polar encoding for the DCI payload with the masked CRC.