CORESET Search Space Configuration for Reliable 5G NR DCI 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 false alarms and early decoding termination are critical.
Innovation Solution
The implementation of polar coding for DCI and PBCH, where Cyclic Redundancy Check (CRC) bits are masked with a Radio Network Temporary Identifier (RNTI) using a bitwise modulus 2 addition operation, and polar encoding is performed to enhance reliability and facilitate early decoding by interleaving bits for the synchronization signal index, allowing for efficient transmission and decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polar encoding is used for channel coding in 5G NR system, then channel capacity and reliability are improved, but encoding and decoding complexity increases
Solution Approach 1:
The patent segments the DCI payload into multiple codeblocks when the payload size exceeds a threshold. Each codeblock is independently encoded with polar encoding, allowing parallel processing and reducing the complexity of encoding large payloads. The segmented codeblocks are then concatenated to form the final encoded output, maintaining reliability while managing complexity through divide-and-conquer approach.
Solution Approach 2:
The patent performs preliminary actions by attaching CRC bits to the DCI payload before encoding, and by pre-determining the segmentation strategy based on payload size. The CRC attachment enables early error detection, and the pre-planned segmentation avoids complex real-time decisions during encoding, thus reducing overall processing complexity while maintaining channel coding reliability.
2Reliability
If CRC bits are masked with RNTI using bitwise modulus 2 addition, then data integrity and authentication are improved, but processing overhead increases
Solution Approach 1:
The patent replaces complex mechanical or iterative verification mechanisms with a simple bitwise modulus 2 addition operation for CRC masking. This substitution allows rapid authentication and integrity checking through efficient bitwise operations, significantly reducing processing overhead while maintaining data integrity and authentication capabilities.
3Productivity
If DMRS sequences are mapped onto CORESET starting from lowest frequency PRB, then resource allocation efficiency is improved, but signal mapping complexity increases
Solution Approach 1:
The patent changes the mapping parameters by starting DMRS sequence mapping from the lowest frequency PRB and proceeding in increasing frequency order. This parameter change simplifies the mapping process by establishing a deterministic, ordered sequence that improves resource allocation efficiency while reducing mapping complexity through a systematic approach.
4Adaptability or versatility
If search space configuration uses multiple identifiers for control resource candidate determination, then system flexibility and adaptability are improved, but configuration complexity increases
Solution Approach 1:
The patent implements a universal search space configuration mechanism where a single search space can be associated with multiple identifiers (such as C-RNTI, SPS C-RNTI, P-RNTI, RA-RNTI). This multi-functional approach allows the same search space structure to serve multiple purposes and different user types, improving system flexibility and adaptability while avoiding the need for separate configurations for each identifier type.
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.