DCI Scrambling Masks for Faster Blind Detection in Polar Decoding

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Solution Overview

Problem

Blind decoding in wireless communications is time-consuming and resource-intensive due to the need for receivers to search multiple candidate locations for downlink control information (DCI) messages, especially in scenarios with intercell interference.

Innovation Solution

The implementation of scrambling sequence design for multi-mode block discrimination using polar codes, where separate scrambling masks derived from unique identifiers are applied to disparate bit fields within DCI messages, enabling early termination of the decoding process and mitigating intercell interference by verifying the intended receiver.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If blind decoding is performed on all candidate locations, then the receiver can find the intended message, but the time and computational resources required increase significantly

Engineering Contradiction:

Improvemessage detection accuracyVSAvoiddecoding time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent embeds receiver identifiers into frozen bits before the main decoding process begins. This preliminary encoding allows the receiver to verify identifier matching early in the decoding process, enabling early termination for non-matching candidates and thus reducing overall decoding time while maintaining reliable message detection

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent divides the DCI message into information bits and frozen bits, with the frozen bits containing embedded receiver identifiers. This segmentation allows the receiver to check identifier compatibility separately from the full message decoding, enabling efficient filtering of non-intended messages before committing full computational resources

Inventive Principle:

Principle #1Segmentation

2Reliability

If blind decoding is performed on all candidate locations, then the receiver can find the intended message, but the computational resources required increase significantly

Engineering Contradiction:

Improvemessage detection accuracyVSAvoidcomputational complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent embeds receiver identifiers into frozen bits before the main decoding process begins. This preliminary encoding allows the receiver to verify identifier matching early in the decoding process, enabling early termination for non-matching candidates and thus reducing overall computational complexity while maintaining reliable message detection

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Inventive Principle:

Principle #1Segmentation

3Reliability

If separate scrambling masks are applied to different bit fields, then intercell interference is mitigated and receiver verification is improved, but the encoding complexity increases

Engineering Contradiction:

Improveintercell interference mitigationVSAvoidencoding complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies different scrambling masks to different bit fields (information bits versus frozen bits) based on their specific functions. Information bits use masks for general interference mitigation, while frozen bits use identifier-based masks for receiver verification. This localized differentiation improves interference mitigation and receiver verification without requiring complete re-encoding of the entire message

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11350404B2Scrambling sequence design for embedding receiver ID into frozen bits for blind detection

Publication Date: 2022.05.31 HYPERX HOLDINGS LLC

AI summary

Methods and devices are described for encoding and decoding control information that has been modulated based on one or more identifiers of the transmitter and/or receiver. Some embodiments describe scrambling sequence design for multi-mode block discrimination on downlink control information (DCI) blind detection. Separate scrambling masks may be applied to disparate bit fields within a coded DCI message, wherein each of the scrambling masks is derived from a unique identifier associated with either the transmitter or the intended receiver. The scrambling masks may be used by the receiver to perform early termination of the decoding process, to mitigate intercell interference, and to verify that the receiver is the intended receiver.