Polar Code DCI Encoding Segmentation for 5G Complexity Reduction

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Solution Overview

Problem

Current channel coding techniques for 5G mobile communication, such as turbo codes and LDPC codes, face challenges in efficiently encoding and decoding downlink control information (DCI) due to complexity and latency issues, particularly in supporting high-speed data rates and low latency requirements.

Innovation Solution

The method involves configuring a generator matrix for polar codes to perform channel coding on DCI, allowing multiple terminals to share common DCI to reduce complexity and using a polar code encoder structure that separates common and dedicated DCI encoding processes, ensuring reliable transmission and decoding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If turbo codes or LDPC codes are used for channel coding of DCI in 5G mobile communication, then error correction capability is improved, but encoding and decoding complexity increases

Engineering Contradiction:

Improveerror correction capabilityVSAvoidencoding and decoding complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The DCI is segmented into common DCI and dedicated DCI parts. The common DCI is shared among multiple terminals and encoded separately, while dedicated DCI is terminal-specific. This segmentation allows terminals to perform blind decoding only on common DCI, significantly reducing decoding complexity while maintaining reliable error correction through polar codes

Inventive Principle:

Principle #1Segmentation

2Reliability

If traditional channel coding techniques are used for DCI transmission, then coding reliability is maintained, but transmission latency increases

Engineering Contradiction:

Improvecoding reliabilityVSAvoidtransmission latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The common DCI is pre-encoded and prepared in advance using polar codes with a specifically designed generator matrix. This preliminary encoding action allows terminals to quickly decode common DCI without performing complex blind decoding attempts, thereby reducing transmission latency while maintaining coding reliability

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If separate encoding is performed for each terminal's DCI, then individual terminal requirements are met, but overall system complexity increases

Engineering Contradiction:

Improveterminal-specific encoding capabilityVSAvoidsystem encoding complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The encoding processes for common DCI and dedicated DCI are merged into a unified polar code encoding framework. The generator matrix is designed to handle both types of DCI together, allowing terminals to receive and decode both common and dedicated information through a single integrated process, thereby reducing system complexity while maintaining adaptability to individual terminal requirements

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentEP3567733B1Method for performing channel-coding of information on basis of polar code

Publication Date: 2023.07.19 LG ELECTRONICS INC

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AI summary

A disclosure of the present specification provides a method for performing channel-coding of information on the basis of polar code. The method comprises the steps of: performing the channel-coding of first input information and second input information by using a generator matrix for the polar code; and transmitting first output information and second output information generated as a result of the channel-coding, wherein the first output information may be generated using only the first input information, and the second output information may be generated using both the first output information and the second input information.