Receiver-ID Frozen-Bit Scrambling for DCI Blind Detection

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

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 are applied to disparate bit fields within a coded DCI message, derived from unique identifiers of the transmitter or receiver, enabling early termination of the decoding process and mitigating intercell interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If blind decoding is performed on all candidate locations to ensure reliable message reception, then message reception reliability is improved, but decoding time and computational resources increase significantly

Engineering Contradiction:

Improvemessage reception reliabilityVSAvoiddecoding time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by embedding receiver identifiers into frozen bits before transmission. This allows the receiver to perform preliminary checks on candidate messages before full decoding, enabling early termination of the decoding process for non-intended messages and significantly reducing decoding time while maintaining reliability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent segments the decoding process into multiple stages: first checking frozen bits containing embedded identifiers, then proceeding to full decoding only for matching candidates. This segmentation enables early termination and reduces overall decoding time across all candidate locations

Inventive Principle:

Principle #1Segmentation

2Measurement precision

If blind decoding is performed on all candidate locations to identify the intended message, then message identification accuracy is improved, but computational resources and energy consumption increase

Engineering Contradiction:

Improvemessage identification accuracyVSAvoidenergy consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent performs preliminary embedding of receiver identifiers in frozen bits, enabling early identification of intended messages before full decoding. This preliminary action maintains identification accuracy while reducing energy consumption by avoiding complete decoding of non-intended messages

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies partial action by performing only partial decoding (checking frozen bits with embedded identifiers) instead of complete decoding for all candidate messages. This partial check is sufficient to identify intended messages and significantly reduces energy consumption

Inventive Principle:

Principle #16Partial or excessive action

3Reliability

If complete decoding is performed on all candidate messages to ensure accurate reception, then reception accuracy is improved, but device complexity and processing overhead increase

Engineering Contradiction:

Improvereception accuracyVSAvoidprocessing overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the reception process into two parts: a lightweight preliminary check of frozen bits containing embedded identifiers, followed by complete decoding only for matching candidates. This segmentation maintains reception accuracy while reducing processing overhead

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent performs preliminary embedding and checking of receiver identifiers in frozen bits before full decoding. This preliminary action filters out non-intended messages early, maintaining reception accuracy for intended messages while reducing overall processing overhead

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS10887879B2Scrambling sequence design for embedding receiver ID into frozen bits for blind detection

Publication Date: 2021.01.05 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.